WO2023248990A1 - Surface fastener, and molding device - Google Patents

Surface fastener, and molding device Download PDF

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Publication number
WO2023248990A1
WO2023248990A1 PCT/JP2023/022659 JP2023022659W WO2023248990A1 WO 2023248990 A1 WO2023248990 A1 WO 2023248990A1 JP 2023022659 W JP2023022659 W JP 2023022659W WO 2023248990 A1 WO2023248990 A1 WO 2023248990A1
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WO
WIPO (PCT)
Prior art keywords
hook
loop fastener
stem portion
shape
machine direction
Prior art date
Application number
PCT/JP2023/022659
Other languages
French (fr)
Japanese (ja)
Inventor
翔一 横山
研人 三橋
雅之 猶原
勇 道端
Original Assignee
Ykk株式会社
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Filing date
Publication date
Application filed by Ykk株式会社 filed Critical Ykk株式会社
Publication of WO2023248990A1 publication Critical patent/WO2023248990A1/en

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    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B18/00—Fasteners of the touch-and-close type; Making such fasteners

Definitions

  • the present invention relates to a hook-and-loop fastener and a molding device used for manufacturing the hook-and-loop fastener.
  • hook-and-loop fasteners Conventionally, there have been two types of hook-and-loop fasteners: a female-type hook-and-loop fastener (hereinafter referred to as a loop member) having multiple loops, and a male-type hook-and-loop fastener (hereinafter referred to simply as a hook-and-loop fastener) that can be attached to and detached from the loop member.
  • Hook-and-loop fastener products are known that are used in combination with
  • a hook-and-loop fastener has, for example, a flat base portion and a plurality of engaging elements that protrude from the base portion and have a shape such as a mushroom shape.
  • Hook-and-loop fasteners are currently widely used in a wide variety of products, including disposable diapers, diaper covers for infants, supports to protect the joints of limbs, waist corsets (lower back pain belts), gloves, etc. It is also used for products that can be attached and detached from the body. Further, an example of a hook-and-loop fastener used for disposable diapers and the like is disclosed in International Publication No. 2017/109902 (Patent Document 1).
  • the hook-and-loop fastener described in Patent Document 1 includes a base portion and a plurality of engagement elements protruding from the base portion.
  • Each engagement element of Patent Document 1 has a stem portion rising from a base portion, and a disc-shaped engagement head integrally formed at the upper end portion of the stem portion.
  • the engagement head is provided with a plurality of minute claws that protrude from the outer peripheral edge of the engagement head.
  • the hook-and-loop fastener of Patent Document 1 is manufactured using a manufacturing device that includes a molding device that performs primary molding and a heating press device that performs secondary molding.
  • the molding device includes one die wheel that rotates in one direction, a supply nozzle arranged to face the outer peripheral surface of the die wheel, and a pickup roller arranged downstream of the supply nozzle in the rotational direction of the die wheel. has.
  • the die wheel includes a cylindrical outer sleeve that serves as a mold, a cylindrical inner sleeve that is closely disposed inside the outer sleeve, and a drive roller that rotates the outer sleeve and the inner sleeve in one direction.
  • the outer sleeve is provided with a plurality of through holes that penetrate from the outer circumferential surface to the inner circumferential surface of the outer sleeve.
  • a plurality of recesses are provided on the outer peripheral surface of the inner sleeve.
  • the heating and pressing device has a pair of upper and lower pressing rollers (calendar rollers).
  • a method for manufacturing a male hook-and-loop fastener instead of using a molding device equipped with one die wheel as described above, a die wheel with a plurality of cavities provided on the outer circumferential surface and a die wheel arranged opposite to the die wheel are used.
  • a method using a twin-roll type molding device equipped with a pressing wheel is known.
  • molten synthetic resin material is supplied from a supply nozzle toward a space between a die wheel and a press wheel that face each other.
  • the base part is formed between the die wheel and the pressing wheel, and the engagement element (or the primary element before being formed into the engagement element) is formed on the outer peripheral surface of the die wheel.
  • Hook-and-loop fasteners can be manufactured continuously.
  • the base portion when stretching along the machine direction (MD) to a molded body (primary molded body) obtained using the forming apparatus of Patent Document 1, the base portion may be pulled in the machine direction within the stretching apparatus. This may cause the base portion to break along the machine direction.
  • the tear strength in the orthogonal direction (CD) of the hook-and-loop fastener may decrease, for example, when force is applied to the base of the hook-and-loop fastener.
  • orthogonal tearing in which the base portion is torn in an orthogonal direction, may occur.
  • the hook-and-loop fastener is perpendicular to the stretched base portion. It is possible that directional tearing or rupture may occur.
  • the orthogonal direction (CD) means a direction perpendicular to the machine direction (MD) during manufacturing.
  • the present invention has been made in view of the above-mentioned conventional problems, and its objects are to provide a hook-and-loop fastener that exhibits different structures and/or properties between the machine direction and the orthogonal direction, and to An object of the present invention is to provide a molding device used for manufacturing fasteners.
  • a hook-and-loop fastener provided by the present invention includes a base part and a plurality of engaging elements integrally formed with the base part, each engaging element being connected to the base part. a stem portion protruding from a surface of the base portion in the thickness direction of the base portion; and an engaging head formed at a distal end portion of the stem portion; A hook-and-loop fastener made of synthetic resin, wherein the orthogonal cross section has a circular or nearly circular shape, and the engaging head has a shape that extends from the tip of the stem part to the entire direction perpendicular to the thickness direction.
  • an outer surface facing in a direction orthogonal to the machine direction is formed in a straight shape or a substantially straight shape. and a second shape when the engaging element is viewed from the orthogonal direction, the outer surface facing the machine direction is curved toward the surface of the base portion.
  • the stem portion includes, in the second shape, a portion in the upper half portion of the stem portion in which the outer surface facing the machine direction is formed in a straight shape or a substantially straight shape; It is preferable that the straight or substantially straight portion of the second shape is formed in a shorter range than the straight or substantially straight portion of the first shape.
  • hook-and-loop fastener includes a base portion and a plurality of engaging elements integrally formed with the base portion, each engaging element being connected to the base portion. It has a stem portion that protrudes from the surface in the thickness direction of the base portion, and an engagement head formed at the tip of the stem portion, and is perpendicular to the thickness direction at least at the upper end portion of the stem portion.
  • the hook-and-loop fastener is made of a synthetic resin and has a cross section having a circular or nearly circular shape, and the engaging head has a shape that extends from the tip of the stem portion to the entire direction perpendicular to the thickness direction.
  • the length of the connecting part of the stem part connected to the base part in the orthogonal direction perpendicular to the machine direction is defined as a first dimension
  • the engaging element is
  • the length of the connecting portion of the stem portion in the machine direction is the second dimension when viewed from the orthogonal direction
  • the stem portion has a shape in which the second dimension is larger than the first dimension
  • the peel strength of the hook and loop fastener when the hook and loop member and the loop member that engage with each other are peeled off along the machine direction and the orthogonal direction are respectively defined as MD peel strength and CD peel strength.
  • the stem portion has a shape such that the CD peel strength is greater than the MD peel strength.
  • Yet another aspect of the hook-and-loop fastener provided by the present invention includes a base portion and a plurality of engaging elements integrally formed with the base portion, each engaging element being arranged on a surface of the base portion.
  • a stem portion protruding from the base portion in the thickness direction, and an engaging head formed at the distal end portion of the stem portion, and a cross section perpendicular to the thickness direction at least at the upper end portion of the stem portion; is a synthetic resin hook-and-loop fastener having a circular or nearly circular shape, and the engaging head having a shape that extends from the tip of the stem portion to the entire direction perpendicular to the thickness direction, , CD flexibility when bending a portion of the hook-and-loop fastener along the orthogonal direction orthogonal to the machine direction in the thickness direction causes the portion of the hook-and-loop fastener along the machine direction to curve in the thickness direction. This is higher than the MD flexibility at the time.
  • the plurality of engaging elements are arranged in a line at constant pitch intervals along the machine direction to form an element row, and the plurality of element rows are arranged in a row in the orthogonal direction.
  • the engaging elements of each element row are arranged at regular intervals, and are shifted in the machine direction by half the pitch interval with respect to the positions of the engaging elements of the element rows adjacent in the orthogonal direction.
  • the engagement element is arranged in such a position that, with respect to the machine direction, the formation range of the stem portion of each engagement element is the same as that of the stem portion of the engagement element in the element rows adjacent to each other in the orthogonal direction.
  • each engagement element has at least one claw portion protruding from the outer peripheral edge of the engagement head in the orthogonal direction.
  • the molding device provided by the present invention includes a die wheel that rotates in one direction, a supply nozzle that supplies molten synthetic resin toward the die wheel, and a plurality of engagement elements on a base portion.
  • each engaging element has a stem portion protruding from the surface of the base portion in the thickness direction of the base portion, and an engaging head formed at a distal end portion of the stem portion.
  • the die wheel has at least one cylindrical sleeve and a drive roller that rotates the sleeve, and the sleeve penetrates from the outer peripheral surface to the inner peripheral surface of the sleeve.
  • the through-holes of each hole row are arranged at regular intervals in orthogonal directions, and the through-holes of each hole row are half the hole pitch interval in the machine direction with respect to the positions of the through-holes of the hole rows adjacent in the orthogonal direction.
  • the through-holes are arranged at positions shifted in size, and the through-holes are arranged in a portion where, with respect to the machine direction, the formation range of each through-hole overlaps with the formation range of the through-holes in the hole rows adjacent in the orthogonal direction. It is placed in a position with
  • FIG. 2 is a schematic diagram schematically illustrating a manufacturing apparatus for manufacturing the hook-and-loop fastener shown in FIG. 1.
  • FIG. 1 is a schematic diagram schematically illustrating a manufacturing apparatus for manufacturing the hook-and-loop fastener shown in FIG. 1.
  • FIG. 6 is a schematic diagram schematically showing a part of the outer sleeve included in the molding device of the manufacturing device shown in FIG. 5;
  • FIG. 2 is a perspective view schematically showing a primary molded body formed in a primary molding process. It is an explanatory view explaining a peel strength test. It is another explanatory diagram explaining a peel strength test.
  • FIG. 2 is a schematic diagram schematically showing a test device for measuring the flexibility of a hook-and-loop fastener.
  • FIG. 11 is a schematic diagram schematically showing a state in which the hook-and-loop fastener is pressed by the testing device of FIG. 10;
  • the present invention is not limited to the embodiments described below, and various modifications may be made as long as they have substantially the same configuration as the present invention and achieve similar effects. It is possible.
  • the length dimension (dimension in the machine direction MD) and width dimension (dimension in the orthogonal direction CD) of the hook-and-loop fastener of the present invention are not particularly limited, and can have any shape by cutting the hook-and-loop fastener. It is possible.
  • FIG. 1 is a copy of a photograph taken from above of a part of the hook-and-loop fastener according to this embodiment.
  • 2 to 4 are a photograph taken from above (plan view), a photograph taken from the machine direction side (front view or rear view), and an orthogonal photograph of one engaging element of the hook-and-loop fastener according to the present embodiment, respectively. This is a copy of a photograph taken from the direction (side view).
  • the front-back direction is the length direction of the hook-and-loop fastener and the primary molded object which are formed into a long length.
  • the front-rear direction is a direction (first direction) along the machine direction MD in which the hook-and-loop fastener or the primary formed body is conveyed in the hook-and-loop fastener manufacturing process.
  • the left-right direction refers to the width direction that is perpendicular to the length direction and along the flat upper surface (first surface) or lower surface (second surface) of the base portion of the hook-and-loop fastener.
  • the left-right direction and the width direction are directions (second direction) along the orthogonal direction CD orthogonal to the machine direction MD.
  • the up-down direction is a height direction (or a thickness direction of the base part) along a direction perpendicular to the flat upper surface or lower surface of the base part, and is also a direction perpendicular to the front-back direction and the left-right direction.
  • the direction of the side where the engaging element projects with respect to the base portion is defined as the upper side in the vertical direction, and the opposite direction is defined as the lower side.
  • the hook-and-loop fastener 10 is manufactured by using a manufacturing apparatus 50 having a forming apparatus 60, a heating press apparatus 70, and a stretching apparatus 80 shown in FIG. Manufactured into shapes.
  • the hook-and-loop fastener 10 is made of thermoplastic resin such as polypropylene, polyester, nylon, polybutylene terephthalate, or a copolymer thereof. Note that the material of the hook-and-loop fastener 10 is not particularly limited, and the hook-and-loop fastener 10 may be formed using, for example, a biodegradable resin, a plant-derived resin, or a thermoplastic resin obtained by recycling.
  • the hook-and-loop fastener 10 includes a flat base portion 11 with a thin thickness, and a plurality of engaging elements 20 that protrude from the upper surface of the base portion 11 and have a mushroom-like shape. has.
  • the base portion 11 is formed to be long along the machine direction MD when the hook and loop fastener 10 is manufactured.
  • the base portion 11 has a certain thickness that ensures appropriate strength and flexibility.
  • the upper surface (first surface) of the base portion 11 and the lower surface (second surface) disposed on the opposite side of the upper surface are each flat or approximately flat, and are formed parallel to each other.
  • Each engagement element 20 includes a stem portion 21 that projects upward from the upper surface of the base portion 11, a disk-shaped engagement head 22 that is integrally formed at the upper end of the stem portion 21, and an engagement head 22 that is integrally formed at the upper end of the stem portion 21. It has two minute claw portions 23 that protrude outward from the outer peripheral edge along the orthogonal direction CD.
  • the shape of the stem portion 21 when the engaging element 20 is viewed from the machine direction MD is defined as a first shape 31 of the stem portion 21
  • the shape of the stem portion 21 when the engaging element 20 is viewed from the orthogonal direction CD is defined as a first shape 31 of the stem portion 21.
  • the shape is defined as the second shape 32 of the stem portion 21.
  • the stem portion 21 (particularly the lower half of the stem portion 21) of each engagement element 20 is stretched along the machine direction MD, which will be described later, in the manufacturing process of the hook-and-loop fastener 10.
  • a first shape 31 (see FIG. 3) of the portion 21 and a second shape 32 (see FIG. 4) of the stem portion 21 are formed to be different from each other.
  • the first shape 31 and the second shape 32 of the stem portion 21 are different from each other mainly in the lower half of the stem portion 21, and the first shape 31 of the stem portion 21
  • the lower half portion is formed to be thinner than the lower half portion of the second shape 32 of the stem portion 21 .
  • the engagement element 20 is formed to be more flexible in the orthogonal direction CD than in the machine direction MD, for example, when a force is applied from above the engagement element 20.
  • the upper half and the lower half of the stem portion 21 respectively refer to the base portion of the stem portion 21 that is closer to the base portion than the center position when the stem portion 21 is partitioned at the center position in the height direction of the stem portion 21. 11, and a portion closer to the base portion 11 than the central position thereof.
  • the first shape 31 of the stem portion 21 is perpendicular to the stem portion 21.
  • the outer surface 21a facing the direction CD is straight from the upper end position of the stem part 21 connected to the engagement head 22 to the lower end position (connection part) of the stem part 21 connected to the base part 11. It is formed in an extending straight shape, or in a substantially straight shape extending along a nearly straight line.
  • an angle of approximately 95° is formed between the outer surface 21a of the stem portion 21 facing in the orthogonal direction CD and the upper surface of the base portion 11.
  • the size of the angle between the outer surface of the stem portion 21 facing in the orthogonal direction CD and the upper surface of the base portion 11 is not limited to this.
  • the first shape 31 includes a curved portion in which the outer surface 21a of the stem portion 21 facing in the orthogonal direction CD is curved concavely in the vertical direction, for example, at the lower end portion of the stem portion 21 close to the base portion 11. It may be formed of.
  • the straight or substantially straight portion of the outer surface 21a of the first shape 31 covers 50% or more, preferably 60% or more of the vertical range of the lower half of the stem portion 21. Preferably.
  • a straight shape extending straight or a substantially straight shape extending along a nearly straight line means that the outer circumferential surface of the stem portion 21 formed in a substantially cylindrical shape, which will be described later, is This refers to a shape in which the outer circumferential surface of the stem portion 21 does not include a curved portion that is concavely curved or clearly curved in the vertical direction when viewed from the direction.
  • the outer surface 21a of the stem portion 21 facing in the orthogonal direction CD forms an angle larger than 95° (for example, an angle of 100 to 110°) with the upper surface of the base portion 11, the outer surface If 21a extends straight or along a nearly straight line, it is assumed that it is formed in a straight shape or a substantially straight shape.
  • the second shape 32 of the stem portion 21 has an outer surface 21a facing in the machine direction MD of the stem portion 21 in a straight or substantially straight shape. and a curved portion in which the outer surface 21a extends in a concave manner in the vertical direction.
  • the portion where the outer surface 21a of the stem portion 21 facing in the machine direction MD is formed in a straight shape or a substantially straight shape is mainly provided in the upper half of the stem portion 21, and It is formed in a shorter range than the straight or substantially straight portion of the first shape 31 shown in FIG.
  • the curved portion formed by curving the outer surface 21a of the stem portion 21 facing the machine direction MD is provided mainly in the lower half of the stem portion 21.
  • the curved portion of the outer surface 21a of the second shape 32 is preferably provided over 30% or more, preferably 40% or more of the vertical range of the lower half of the stem portion 21.
  • the curved portion of the outer surface 21a of the second shape 32 is longer than the curved portion of the first shape 31, for example, if the curved portion is provided at the lower end of the first shape 31.
  • the shape of the outer surface 21a facing in the orthogonal direction CD in the first shape 31 shown in FIG. 3 is similar to the shape of the upper half of the outer surface 21a facing in the machine direction MD in the second shape 32 shown in FIG.
  • the outer surface 21a of the stem portion 21 facing in the machine direction MD is formed at an angle of approximately 95° with respect to a direction parallel to the upper surface of the base portion 11. is formed.
  • the portion where the outer surface 21a of the stem portion 21 facing in the machine direction MD is formed in a straight or substantially straight shape is the entire height dimension of the stem portion 21 in the second shape 32 (the height of the base portion 11). It is arranged in a range of 1/2 or more and 3/4 or less of the vertical dimension from the upper surface to the upper end of the stem portion 21.
  • the lower half of the stem portion 21 exhibiting the second shape 32 has a second shape as shown in FIG.
  • the thickness of the stem part 21 is changed significantly so that the stem part 21 becomes thicker as it approaches the base part 11 compared to the lower half part of the stem part 21 which shows one shape 31.
  • the straight or substantially straight outer surface 21a of the stem portion 21 extends to the lower end connected to the base portion 11 of the stem portion 21, and the straight or substantially straight outer surface 21a A boundary portion that sharply bends at an angle close to 90° (approximately 95°) is provided between the base portion 11 and the upper surface (surface).
  • the outer surface 21a of the lower half of the stem portion 21 is gently and largely curved, and the slope of the outer surface 21a of the stem portion 21 becomes gentler as it approaches the base portion 11. Therefore, the outer surface 21a of the stem portion 21 in the second shape 32 is formed so as to be smoothly continuous with the surface of the base portion 11.
  • the upper half of the stem portion 21 is formed into a substantially cylindrical shape. Therefore, the outer circumferential surface of the upper half of the stem portion 21 is formed into a curved surface that continues smoothly all around the circumference, and the outer circumferential surface is not provided with any angular ridge lines or protrusions. Further, the stem portion 21 is formed such that a cross section of the upper end portion of the stem portion 21 perpendicular to the vertical direction has a circular or nearly circular shape (substantially circular shape).
  • the connecting portion i.e., the lower end of the stem portion 21
  • the connecting portion that connects to the base portion 11 of the stem portion 21 is shaped like an ellipse or a long ellipse in the machine direction MD such that the maximum dimension in the machine direction MD is larger than the maximum dimension in the orthogonal direction CD. It is formed into a substantially elliptical shape.
  • a substantially elliptical shape means a shape close to an ellipse, and includes, for example, an oval shape.
  • the length of the connecting portion along the orthogonal direction CD when the engaging element 20 is viewed from the machine direction MD is defined as a first dimension D1
  • the length of the connecting portion in the machine direction MD when viewed from the orthogonal direction CD is defined as a second dimension D2.
  • the stem portion 21 is formed such that the second dimension D2 of the connecting portion in the second shape 32 is larger than the first dimension D1 of the connecting portion in the first shape 31.
  • the second dimension D2 of the connecting portion in the second shape 32 is, for example, 1.5 to 2 times the length of the first dimension D1 of the connecting portion in the first shape 31.
  • the plurality of engaging elements 20 are provided on the upper surface of the base portion 11 in a regular alignment in a staggered arrangement pattern.
  • the engaging elements 20 are arranged at constant pitch intervals along the machine direction MD (front-back direction), thereby forming an engaging element row 26.
  • the plurality of engagement element rows 26 are arranged at regular intervals in the orthogonal direction CD (left-right direction).
  • the engagement elements 20 of each engagement element row 26 are arranged at a pitch of 1/2 in the machine direction MD with respect to the position of the engagement elements 20 of the engagement element rows 26 adjacent in the orthogonal direction CD. They are placed at shifted positions based on the size of the interval.
  • the plurality of engagement elements 20 are arranged alternately or in a zigzag pattern between the engagement element rows 26 adjacent to each other in the orthogonal direction CD.
  • the formation range 27 of the stem portion 21 of each of the engagement elements 20 corresponds to the engagement elements of the engagement element rows 26 adjacent to each other in the orthogonal direction CD. It is arranged at a position having an overlapping portion with respect to the formation range 27 of 20.
  • the edge of the stem portion 21 of each engaging element 20 on one side (for example, the front side) in the machine direction MD is It is located between an edge on one side (for example, the front side) and an edge on the other side (for example, the rear side) in the machine direction MD.
  • the second shape 32 of the stem portion 21 when the engaging element 20 is viewed from the orthogonal direction CD includes a portion that curves the outer surface 21a of the stem portion 21, and when viewed from the machine direction MD;
  • the connecting portion of the stem portion 21 that connects to the base portion 11 is formed so that the second dimension D2 in the machine direction MD is larger than the first shape 31 of the stem portion 21 when viewed, and
  • the formation range 27 of the engaging elements 20 of the engaging element rows 26 adjacent in the orthogonal direction CD overlaps with the formation range 27 of the engaging elements 20 of the engaging element rows 26 adjacent to each other in the orthogonal direction CD.
  • the strength of the portion 11 in the machine direction MD can be effectively increased. For this reason, for example, in the stretching process for forming the base part 11 in the manufacturing process of the hook-and-loop fastener 10, when the base part 11 is pulled and stretched in the machine direction MD, it is possible to prevent defects such as breakage from occurring in the base part 11. .
  • the engagement head 22 is formed relatively thin in the vertical direction, and extends from the tip of the stem portion 21 in a direction perpendicular to the vertical direction (that is, from the top surface of the base portion 11). It has a shape that spreads over the entire area (parallel direction). Furthermore, when the engaging element 20 is viewed from above, the engaging head 22 has an elliptical or substantially elliptical shape that is long in the orthogonal direction CD, as shown in FIG.
  • the disc-shaped engagement head 22 is formed to radially project outward from the upper end of the stem portion 21 (in other words, the boundary between the stem portion 21 and the engagement head 22).
  • the shape of the engaging head is not limited to the shape of an ellipse or a disk that is approximately elliptical when viewed from above, but may extend from the tip of the stem portion 21 in a direction parallel to the surface of the base portion 11. If it is formed, it may have a shape that is a perfect circle, a shape close to a perfect circle, or a shape close to a polygon such as a quadrilateral when viewed from above.
  • Each engagement element 20 is provided with a pair of left and right minute claws 23 that protrude in opposite directions from the outer peripheral edge of the engagement head 22 along the orthogonal direction CD.
  • the left and right claw portions 23 are arranged at the left and right ends of the engagement head 22 that is long in the orthogonal direction CD.
  • the outer peripheral edge of the engaging head 22 has a non-formed region where the claw portion 23 is not provided, and in this embodiment, the non-formed region of the claw portion 23 in the engaging head 22 is as follows. It is arranged facing the machine direction MD.
  • each of the left and right claw portions 23 has a shape that hangs diagonally downward from the outer peripheral edge of the engagement head 22 toward the tip in the protruding direction so as to approach the base portion 11.
  • each claw portion 23 has a base end portion connected to the engagement head portion 22 of the claw portion 23 that has a dimension in the machine direction MD of the engagement head portion 22 in a plan view when the engagement element 20 is viewed from above.
  • the size is smaller than the maximum value of , preferably 2/3 or less of the maximum value.
  • the shape and size of the engaging head are not particularly limited as long as the engaging head is formed in a shape that extends from the upper end of the stem portion in a direction orthogonal to the up-down direction.
  • the shape of the claws, the number of claws installed, the direction in which the claws project from the engaging head, etc. are not particularly limited.
  • the engaging element may be formed without providing a claw portion.
  • One hook-and-loop fastener may be provided with a plurality of types of engagement elements having mutually different shapes.
  • the manufacturing device 50 of this embodiment includes a molding device 60 that performs primary molding, and a secondary molded product (preform) that performs secondary molding on the primary molded object 40 (see FIG. 7) molded by the molding device 60. It has a heating and pressing device 70 for forming a fastener body) and a stretching device 80 for stretching the obtained secondary formed body.
  • the pre-fastener body means a molded body or member before being subjected to stretching when the hook-and-loop fastener 10 is manufactured by stretching.
  • the molding device 60 includes a die wheel 61 that is driven to rotate in one direction (counterclockwise in the drawing) and a supply nozzle that is disposed facing the circumferential surface of the die wheel 61 and continuously supplies a molten synthetic resin material. 65, and a pickup roller 66 disposed downstream of the supply nozzle 65 in the rotational direction of the die wheel 61.
  • the die wheel 61 includes a cylindrical outer sleeve (outer cylindrical body) 62 serving as a mold, a cylindrical inner sleeve (inner cylindrical body) 63 disposed closely inside the outer sleeve 62, and an outer sleeve 62. and a drive roller 64 that rotates the inner sleeve 63 in one direction.
  • a cooling jacket (not shown) is provided inside the drive roller 64 to allow cooling fluid to flow therethrough.
  • each through hole 62a has a substantially truncated conical shape in which the outer peripheral surface of the outer sleeve 62 has a larger circular shape than the inner peripheral surface of the outer sleeve 62.
  • the formation positions of the plurality of through holes 62a provided in the outer sleeve 62 correspond to the positions where the engagement elements 20 are arranged in the secondary molded body to be produced.
  • the plurality of through holes 62a are provided in the outer sleeve 62 in regular alignment in a staggered arrangement pattern, as shown in FIG. 6, for example.
  • the through holes 62a are arranged at constant pitch intervals along the machine direction MD, thereby forming a hole row 62b.
  • the plurality of hole rows 62b are arranged at regular intervals in the orthogonal direction CD.
  • the positions of the through holes 62a of each hole row 62b are shifted by a pitch interval of 1/2 in the machine direction MD with respect to the positions of the through holes 62a of the hole rows 62b adjacent to each other in the orthogonal direction CD. It is placed in the same position.
  • the plurality of through holes 62a are arranged alternately or in a zigzag pattern between the hole rows 62b adjacent to each other in the left-right direction.
  • the plurality of through holes 62a are located at positions where, in the machine direction MD, the formation range 62c of each through hole 62a overlaps with the formation range 62c of the through hole 62a of the adjacent hole row 62b in the orthogonal direction CD. It is arranged.
  • the plurality of through holes 62a in the outer sleeve 62 in such a positional relationship, when the hook-and-loop fastener 10 is manufactured, the plurality of engagement elements 20 can be arranged in rows of engagement elements adjacent in the orthogonal direction CD.
  • the engagement elements 20 can be stably arranged so that the formation ranges 27 of the engagement elements 20 overlap each other between the engagement elements 26.
  • a plurality of grooves are formed on the outer peripheral surface of the inner sleeve 63.
  • Each of the grooves is recessed linearly along the orthogonal direction CD parallel to the central axis of the inner sleeve 63 and has a size that allows the molten synthetic resin to flow therein.
  • the groove portions are formed at regular intervals along the circumferential direction (machine direction MD) of the inner sleeve 63. Furthermore, at least a portion of the groove portion of the inner sleeve 63 is provided so as to intersect with the outer circumferential edge of the through hole 62a formed in the inner circumferential surface of the outer sleeve 62 when the die wheel 61 is assembled.
  • the form of the recess provided on the outer circumferential surface of the inner sleeve is not limited to the linear groove as in this embodiment.
  • the outer circumferential surface of the inner sleeve may be provided with, for example, a concave groove bent in a zigzag shape, or a concave portion recessed in a three-dimensional shape such as a rectangular parallelepiped from the outer circumferential surface of the inner sleeve.
  • the die wheel does not have two sleeves, an outer and an inner sleeve, as in this embodiment, but has, for example, a plurality of through holes penetrating from the outer circumferential surface to the inner circumferential surface, and a plurality of through holes provided on the inner circumferential surface.
  • the sleeve may be formed with one sleeve having a recessed groove portion.
  • the pickup roller 66 has a pair of upper and lower clamping rollers 67 and 68 that clamp and pull the primary formed body 40 formed on the outer peripheral surface of the die wheel 61 from above and below.
  • a surface layer (not shown) made of an elastomer such as a polyurethane elastomer is provided on each outer peripheral surface of the upper clamping roller 67 and the lower clamping roller 68.
  • the heating and pressing device 70 has a pair of upper and lower pressing rollers (calendar rollers) 71 and 72 arranged downstream of the pickup roller 66.
  • the upper pressing roller 71 and the lower pressing roller 72 are arranged facing each other with a predetermined interval therebetween.
  • the distance between the upper pressing roller 71 and the lower pressing roller 72 can be adjusted by a height adjusting means (not shown).
  • the upper pressing roller 71 is equipped with a heating source (not shown) inside, and the surface temperature of the upper pressing roller 71 is set to a temperature that can soften the synthetic resin forming the hook-and-loop fastener 10 (primary molded body 40). be done.
  • the structure of the heating and pressing device is not particularly limited as long as it can press at least a portion of the primary molded body 40 to form an engagement element as described later.
  • the stretching device 80 is installed downstream of the heating and pressing device 70 in order to perform at least a stretching process on the pre-fastener body (secondary molded object) formed by the heating and pressing device 70.
  • the stretching device 80 includes a supply section that introduces the pre-fastener body into the stretching device 80, a discharge section that sends out the stretched hook-and-loop fastener 10 downstream, and a supply section and a discharge section. It has a plurality of rotating rollers arranged along the conveyance path of the member to be processed (ie, the pre-fastener body or the hook-and-loop fastener 10).
  • Each rotating roller is configured to be able to convey the workpiece toward the downstream side at a speed corresponding to the rotational speed of the workpiece by rotating while contacting the workpiece. Furthermore, at least some of the rotating rollers are configured to be able to heat the workpiece at a preset heating temperature by bringing the workpiece into contact with the outer peripheral surface of the roller.
  • the rotating rollers of the stretching device 80 include a heating roller that heat-treats the pre-fastener body, a stretching roller that stretches the pre-fastener body between the heating roller, and a relaxing roller disposed downstream of the stretching roller. is included.
  • the heating roller, the stretching roller, and the relaxing roller are installed so as to meander up and down the conveyance path of the workpiece.
  • the heating roller conveys the pre-fastener body by rotating at a constant rotational speed, and heats the pre-fastener body by bringing it into contact with the roller surface.
  • the heating roller is provided with a support roller (nip roller) disposed opposite to the heating roller, and the heating roller and the support roller hold the pre-fastener body between the top and bottom while each holding the pre-fastener body at a certain level. Rotate at speed.
  • This heating roller can heat the pre-fastener body before stretching to a temperature at which it can be stretched.
  • the means and method for performing the heat treatment before stretching are not particularly limited.
  • the stretching roller is controlled to rotate at a faster rotation speed than the heating roller while bringing the workpiece into contact with the roller surface.
  • the rotation speed of the stretching roller is set to 110% or more and 200% or less of the rotation speed of the heating roller.
  • the heating temperature of the stretching roller is set to be higher than the heating temperature of the heating roller and lower than the melting point of the synthetic resin forming the hook-and-loop fastener 10.
  • the relaxation roller is controlled to rotate at a slower rotation speed than the stretching roller while bringing the workpiece into contact with the roller surface.
  • the heating temperature of the relaxation roller is set lower than the melting point of the synthetic resin forming the hook-and-loop fastener 10.
  • the stretching device 80 of the present embodiment described above is only an example.
  • the stretching device is disposed at least on the downstream side of the forming device, and is configured to be able to stretch along the machine direction MD a molded object such as a pre-fastener body sent out from the primary forming device or the heating press device. If so, the structure is not particularly limited.
  • the manufacturing method of this embodiment includes a primary molding step of molding a primary molded body 40 as shown in FIG.
  • the hook-and-loop fastener 10 is formed by performing a secondary forming process to form a pre-fastener body (not shown) equipped with the engaging elements 20, and by stretching the pre-fastener body along the machine direction MD using a stretching device 80. and a stretching step of forming.
  • molten synthetic resin is continuously supplied from the supply nozzle 65 toward the outer peripheral surface of the die wheel 61.
  • the temporary base portion 41 is continuously formed between the supply nozzle 65 and the die wheel 61.
  • a plurality of primary elements (temporary elements) 42 are integrally molded with the temporary base portion 41 by the through hole 62a provided in the outer sleeve 62 of the die wheel 61 and the groove portion provided in the inner sleeve 63. Therefore, through this primary molding step, a primary molded body 40 shown in FIG. 7 is molded.
  • the primary molded body 40 formed at this time has a flat temporary base portion 41 and a plurality of primary elements 42 protruding from the upper surface of the temporary base portion 41.
  • the temporary base portion 41 is formed thicker than the base portion 11 of the hook-and-loop fastener 10 to be manufactured.
  • the primary element 42 is transformed into the engagement element 20 by being subjected to secondary molding (press molding) in the secondary molding process.
  • the plurality of primary elements 42 are provided on the temporary base portion 41 in a staggered arrangement pattern.
  • Each primary element 42 includes a truncated conical primary stem portion 43 protruding from the temporary base portion 41, a bar-shaped rib portion 44 that partially bulges upward from the upper surface of the primary stem portion 43, and is integral with the rib portion 44.
  • the rib portion 44 has two protruding portions (primary claw portions) 45 that are formed as shown in FIG.
  • the rib portion 44 and the left and right protrusions 45 are formed along the orthogonal direction CD. Further, the left and right protrusions 45 protrude outward from the upper end surface of the primary stem portion 43.
  • the formation range of the primary stem portion 43 of each primary element 42 in the machine direction MD is perpendicular to each other. Element rows adjacent in direction CD are formed so as to overlap each other.
  • the primary element 42 may have two protruding parts (primary claw parts) 45 that partially bulge upward from the upper surface of the primary stem part 43. In this case, in the secondary molding process described later, four minute claws 23 protruding outward from the outer peripheral edge of the engaging head 22 are formed.
  • the above-mentioned primary molded body 40 is molded by carrying the molten synthetic resin on the outer peripheral surface of the die wheel 61 and rotating it half a rotation while being cooled. Thereafter, the primary molded body 40 is continuously peeled off from the outer peripheral surface of the die wheel 61 by the pickup roller 66.
  • the primary formed body 40 peeled off from the die wheel 61 is conveyed toward a heating and pressing device 70 that performs a secondary molding process, and is transported between an upper pressing roller 71 and a lower pressing roller 72 of the heating pressing device 70.
  • the temporary base portion 41 of the primary formed body 40 is supported from below by the lower pressing roller 72. Further, at least the upper end portion of each primary element 42 of the primary molded body 40 is heated and softened by the upper pressing roller 71 and is pressed from above. As a result, a secondary element (not shown) is molded from the primary element 42, so that a pre-fastener body in which a plurality of secondary elements are integrally formed on the temporary base portion 41 is manufactured.
  • the secondary element formed in this secondary molding step is formed integrally with a substantially truncated conical secondary stem portion rising from the temporary base portion 41 and an upper end portion of the secondary stem portion.
  • the engagement head 22 has two minute claws 23 that protrude outward from the outer peripheral edge of the engagement head 22.
  • the secondary stem portion of each secondary element has a circular or substantially circular cross section perpendicular to the vertical direction, and the diameter of the cross section gradually decreases as it moves away from the temporary base portion 41.
  • the shape of the secondary stem portion when the secondary element is viewed from the machine direction MD and the shape of the secondary stem portion when the secondary element is viewed from the orthogonal direction CD are the same or approximately the same shape. It is formed.
  • the engagement head 22 and claw portion 23 provided on each secondary element have substantially the same shape and size as the engagement head 22 and claw portion 23 of the engagement element 20 shown in FIGS. 1 to 4. It is formed.
  • the pre-fastener body sent out from the heating and pressing device 70 is conveyed to the stretching device 80 (see FIG. 5).
  • the stretching device 80 a pre-fastener body is introduced into the stretching device 80 from a supply section (not shown), and the pre-fastener body is subjected to heat treatment (heating step) with a heating roller and stretching performed between the heating roller and the stretching roller. Processing (stretching process) and relaxation treatment after stretching process (relaxation process) are performed in order.
  • the pre-fastener body is brought into contact with the roller surface of a heating roller, thereby heating the pre-fastener body to a temperature at which it can be stretched.
  • the pre-fastener body is stretched along the machine direction MD between the heating roller and a stretching roller that rotates at a faster rotation speed than the heating roller.
  • Stretching processing (uniaxial stretching processing) is performed.
  • the temporary base portion 41 of the pre-fastener body can be stretched in the machine direction MD to form the base portion 11 of the hook-and-loop fastener 10.
  • the thickness between the upper surface and the lower surface of the base part 11 obtained after this stretching process is made thinner than the thickness between the upper surface and the lower surface of the temporary base part 41 after the secondary molding process.
  • the processing conditions for the stretching process include, for example, at least one of the heating temperature of the pre-fastener body, the rotation speed of the heating roller, the rotation speed of the stretching roller, and the like.
  • the approximately truncated conical secondary stem portion is extended in the machine direction MD, and the connecting portion with the base portion 11 is formed into an elliptical shape or approximately elongated in the machine direction MD.
  • the stem portion 21 can be deformed into an elliptical shape. Further, the stem portion 21 can be formed in a shape in which the first shape 31 and the second shape 32 described above are different from each other. As a result, an engaging element 20 having a shape as shown in FIGS. 1 to 4 is molded from the secondary element molded in the secondary molding process.
  • this stretching process can make it difficult to cause the base portion 11 to break along the machine direction MD.
  • the reason for making this breakage difficult to occur is not clear, one of the reasons for this is that in this embodiment, even in the secondary element of the pre-fastener body, the engagement of the hook-and-loop fastener 10 to be manufactured is In the element 20 as well, it is conceivable that the formation range 27 of the secondary stem portion or the stem portion 21 overlaps each other between adjacent element rows in the orthogonal direction CD.
  • the formation range 27 of the secondary stem portion or stem portion 21 overlaps between adjacent element rows in the orthogonal direction CD, so that the strength of the temporary base portion or the base portion 11 is increased. Local reduction can be suppressed. For this reason, it is thought that it is possible to make it difficult to cause the base portion 11 to break in the machine direction MD during the stretching process.
  • the hook-and-loop fastener 10 of this embodiment can be obtained from the pre-fastener body.
  • the temporary base portion 41 of the pre-fastener body is stretched along the machine direction MD to make it thinner, and a stem portion 21 that is long in the machine direction MD is formed from the approximately truncated conical secondary stem portion.
  • the method, means, conditions, etc. of stretching are not particularly limited.
  • a relaxation process is performed on the hook-and-loop fastener 10 having the base portion 11 and the engaging element 20.
  • the hook-and-loop fastener 10 is conveyed between a stretching roller and a relaxing roller that rotates at a rotation speed slower than the stretching roller, with the tension applied to the hook-and-loop fastener 10 being weakened. Thereby, the shape of the hook-and-loop fastener 10 can be stabilized.
  • the hook-and-loop fastener 10 that has passed through the relaxation roller is sent out from the discharge section of the stretching device 80 to the outside. Further, the hook-and-loop fastener 10 discharged from the stretching device 80 is collected by being wound up into a roll shape, for example, by a collection roller or the like. Further, the hook-and-loop fastener 10 may be transported from the stretching device 80 toward a cutting section (not shown), cut into a predetermined width and/or length at the cutting section, and then recovered.
  • the hook-and-loop fastener 10 of this embodiment shown in FIGS. 1 to 4 is manufactured by performing the manufacturing method including the primary molding process, secondary molding process, and stretching process described above.
  • the stem portion 21 of each engaging element 20 has a first shape when the engaging element 20 is viewed from the machine direction MD, as shown in FIGS. 3 and 4. 31 and the second shape 32 when the engaging element 20 is viewed from the orthogonal direction CD have a structure in which the directionality is different from each other (i.e., the difference between the machine direction MD and the orthogonal direction CD). ing.
  • the connecting portion of the stem portion 21 connected to the base portion 11 is formed in an elliptical or substantially elliptical shape long in the machine direction MD, and the engaging element rows 26 adjacent to each other in the orthogonal direction CD Between them, the hook-and-loop fastener 10 is formed such that the forming ranges 27 of the stem portions 21 in the machine direction MD overlap with each other.
  • each engaging element 20 has a structure that is different from each other in the machine direction MD and the orthogonal direction CD. properties can be shown.
  • the peel strength of the hook-and-loop fastener 10 against a loop member the strength when the hook-and-loop fastener 10 is peeled off along the machine direction MD is defined as the MD peel strength, and the strength when the hook-and-loop fastener 10 is peeled off along the orthogonal direction CD is defined as the MD peel strength.
  • the strength at this time is defined as CD peel strength.
  • the hook-and-loop fastener 10 of this embodiment has a structure with directionality, so that the CD peel strength is greater than the MD peel strength, as described below.
  • FIGS. 8 and 9 a method for measuring the CD peel strength and MD peel strength of the hook-and-loop fastener 10 will be described with reference to FIGS. 8 and 9.
  • a method for measuring the CD peel strength of the hook and loop fastener 10 first, as shown in FIG. do. Furthermore, by adhering the cut piece 91 to a support member 92, a first test piece 93 on the hook-and-loop fastener 10 side is produced. Further, by cutting a loop member formed with a predetermined basis weight into a predetermined shape and size, a second test piece 94 to be engaged with the cut piece 91 (velcro fastener 10) of the first test piece 93 is produced. .
  • the hook-and-loop fastener 10 provided on the first test piece 93 is engaged with the second test piece 94, and the second test piece 94 is further folded back into a U-shape as shown in FIG.
  • the first test piece 93 and the second test piece 94 are each held by a pair of clampers (not shown), and then the clamper holding the first test piece 93 and the clamper holding the second test piece 94 are held together. Move them away from each other at a constant speed. As a result, a load as shown by the arrows in FIG. 9 can be gradually applied to the first test piece 93 and the second test piece 94 in the engaged state.
  • the average load for 50 mm from the start of applying the load is calculated by the integral method (however, the analysis is performed from the 3 mm position of the engagement portion to 99% of 50 mm).
  • the CD peel strength (N/cm) of the hook-and-loop fastener 10 is measured.
  • a long and narrow cut piece whose dimension in the orthogonal direction CD is longer than the dimension in the machine direction MD is cut out from the hook-and-loop fastener 10. Furthermore, a first test piece on the side of the hook-and-loop fastener 10 is produced by adhering the cut piece of the hook-and-loop fastener to a support member. Thereafter, a second test piece is prepared in the same manner as when measuring CD peel strength. Using the obtained first test piece and second test piece, the MD peel strength (N/cm) of the hook-and-loop fastener 10 is measured by performing the same measurement as when measuring the CD peel strength.
  • the claw portion 23 of the engaging element 20 protrudes along the orthogonal direction CD
  • the hook-and-loop fastener 10 is engaged with the loop member along the orthogonal direction CD
  • the loop of the loop member can be easily hooked onto the claw portion 23 of the coupling element 20.
  • the first shape 31 of the stem portion 21 when the engaging element 20 is viewed from the machine direction MD is formed to be thinner than the second shape 32 of the stem portion 21 when the engaging element 20 is viewed from the orthogonal direction CD. Therefore, each engagement element 20 is formed to be more flexible in the orthogonal direction CD than in the machine direction MD, as described above.
  • the stem portion 21 of the engagement element 20 is easily bent in the orthogonal direction CD, when the hook-and-loop fastener 10 is engaged with the loop member along the orthogonal direction CD, for example, the hook-and-loop fastener 10 is moved in the machine direction MD.
  • the engaging element 20 can be inserted more deeply between the loops of the loop member by utilizing the deflection of the stem portion 21. Therefore, each engaging element 20 can be more securely engaged with the loop member.
  • the hook-and-loop fastener 10 of this embodiment has the property that when the MD peel strength and the CD peel strength are measured and compared, the CD peel strength is higher than the MD peel strength.
  • the CD peel strength and the MD peel strength were each measured multiple times and the average value was calculated.
  • the CD peel strength was 0.53 N/cm
  • the MD peel strength was It was 0.02N/cm. Therefore, it was confirmed that the CD peel strength was 10 times or more greater than the MD peel strength.
  • even if each engaging element 20 has a different structure in the machine direction MD and the orthogonal direction CD no difference in directionality was observed in the shear strength of the hook-and-loop fastener 10.
  • the hook-and-loop fastener 10 of this embodiment which has a CD peel strength higher than the MD peel strength, is used, for example, in a disposable diaper
  • the hook-and-loop fastener 10 can be easily engaged with and peeled off from the loop member. It is preferable to attach it to the disposable diaper in an orientation along the direction CD orthogonal to (i.e., as shown in FIG. 8).
  • the hook-and-loop fastener 10 when the hook-and-loop fastener 10 is engaged with the loop member of a disposable diaper, the engagement state between the hook-and-loop fastener 10 and the loop member is stably maintained due to the high CD peel strength of the hook-and-loop fastener 10, and the hook-and-loop fastener 10 can be prevented from easily peeling off from the loop member. As a result, the attached state of the diaper can be stably maintained by the engagement between the hook-and-loop fastener 10 and the loop member.
  • the hook-and-loop fastener 10 may be pulled strongly to peel it off from the loop member, and then the hook-and-loop fastener 10 may be reengaged at an appropriate position on the loop member.
  • the hook-and-loop fastener 10 of this embodiment since the engaging element 20 is formed to be easily bent in the orthogonal direction CD as described above, the hook-and-loop fastener 10 is turned over with strong force and peeled off from the loop member.
  • the stem portion 21 in the orthogonal direction CD it is possible to make it easier to smoothly remove the loop of the loop member from the engagement element 20.
  • the engaging element 20 is formed to be easily bent in the orthogonal direction CD as described above, when the hook-and-loop fastener 10 is strongly pulled and separated from the loop member, the stem portion 21 is bent as described above, causing the loop The loop of the member can be smoothly removed from the engagement element 20. Therefore, even if the tear strength of the base portion 11 in the orthogonal direction CD is reduced due to stretching, when a large force is applied to the hook-and-loop fastener 10 engaged with the loop member, the engaging element 20 Since the engagement of the loop member is released, tearing of the base portion 11 in the orthogonal direction CD can be prevented.
  • each engaging element 20 has a different structure in the machine direction MD and the orthogonal direction CD, so that the portion of the hook-and-loop fastener 10 along the orthogonal direction CD is It has a property that the CD flexibility when curved in the vertical direction is higher than the MD flexibility when the portion of the hook-and-loop fastener 10 along the machine direction MD is curved in the vertical direction.
  • FIG. 10 shows the state of the flexibility testing device before operation.
  • FIG. 11 shows a state in which the flexibility testing device is activated and pressure is applied to the hook-and-loop fastener 10.
  • the hook-and-loop fastener 10 When measuring MD flexibility, the hook-and-loop fastener 10 is cut to produce a long test piece 101 in which the machine direction MD is longer than the orthogonal direction CD. Furthermore, when measuring CD flexibility, the hook-and-loop fastener 10 is cut to produce a long test piece 101 in which the orthogonal direction CD is longer than the machine direction MD.
  • a loop portion 102 is formed in the test piece 101 by bending the obtained test piece 101 into a loop shape in the front and back directions of the base portion 11 near the center in the length direction of the test piece 101. At this time, the test piece 101 is bent so that the engaging element 20 of the hook-and-loop fastener 10 is disposed on the inner peripheral side of the loop portion 102 . Furthermore, an overlapping portion 103 is formed by overlapping both lengthwise ends of the test piece 101 with the loop portion 102 formed thereon. In this case, the test piece 101 is bent such that the length of the loop portion 102 is 100 mm or more, and the length of the overlap portion 103 is 20 mm or more, for example.
  • the flexibility testing device includes a moving member 104 that moves up and down, a presser 106 that is attached to the moving member 104 and pressurizes the loop portion 102 of the test piece 101, and a clamp 107 that fixes the overlapped portion 103 of the test piece 101. and a load cell 105 that is attached to the clamp 107 and converts the load into an electrical signal.
  • the clamp 107 supports the test piece 101 by holding the overlapped part 103 of the test piece 101 in such a way that the loop part 102 of the test piece 101 protrudes toward the presser 106 .
  • the moving member 104 is moved upward.
  • the presser 106 also moves upward, so that the presser 106 presses the loop portion 102 of the test piece 101, as shown in FIG.
  • the load cell 105 measures the maximum load within the moving range.
  • Such maximum load measurements are performed multiple times each for the test piece 101 that has a long machine direction MD and the test piece 101 that has a long orthogonal direction CD, and the average value is determined as MD flexibility and CD flexibility. Ta. Note that the smaller this average value is, the more excellent the flexibility of the hook-and-loop fastener 10 is.
  • the connecting portion connected to the base portion 11 has an elliptical or substantially elliptical shape that is long in the machine direction MD. Further, the formation ranges 27 of the stem portions 21 of each engaging element 20 in the machine direction MD overlap between adjacent engaging element rows 26 in the orthogonal direction CD. For this reason, the hook-and-loop fastener 10 of the present embodiment has a property in which the CD flexibility shows a smaller value than the MD flexibility when the MD flexibility and CD flexibility are measured and compared. It has a property that the flexibility is better in the orthogonal direction CD than in the machine direction MD.
  • the MD flexibility showed a value of 0.07, and the CD flexibility was 0.05, which is smaller than the MD flexibility. It was confirmed that the value was shown.
  • the hook-and-loop fastener 10 is designed so that the engagement and peeling with respect to the loop member are perpendicular to the hook-and-loop fastener 10.
  • it is attached to the disposable diaper in an orientation carried out along the direction CD.
  • the hook-and-loop fastener 10 is engaged with the loop member of the disposable diaper, and when the hook-and-loop fastener 10 is peeled off from the loop member, the hook-and-loop fastener 10 is easily bent in the front and back directions (vertical direction) of the base portion 11. , the ease of handling of the hook-and-loop fastener 10 can be improved, making it easier to attach and detach the disposable diaper.
  • the base portion 11 in the orthogonal direction CD is reduced due to stretching, when a large force is applied to the base portion 11, the base portion 11 is bent in the front-back direction (vertical direction). It is also possible to prevent the base portion 11 of the CD from being torn.
  • the MD flexibility value of the hook-and-loop fastener 10 is large, it is possible to prevent the hook-and-loop fastener 10 from being rolled up in the MD direction due to rubbing between clothes and disposable diapers, for example, when picking up a baby or taking off clothes. can.
  • the secondary molded body in the embodiment described above is produced by performing a primary molding process using the molding device 60 and a secondary molding process using the heating press device 70.
  • the method and means for forming the molded object to be subjected to stretching processing there are no particular limitations on the method and means for forming the molded object to be subjected to stretching processing.
  • the molded body to be stretched may be directly molded by performing the molding process using an apparatus.

Landscapes

  • Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)

Abstract

A surface fastener (10) according to the present invention includes a base portion (11) and a plurality of engaging elements (20) formed integrally with the base portion (11), wherein: when the engaging elements (20) are seen from a machine direction (MD), a lower half portion of a stem portion (21) has a first shape (31) in which an outer surface (21a) is formed with a straight shape or a substantially straight shape; and when the engaging elements (20) are seen from an orthogonal direction (CD), the lower half portion of the stem portion (21) has a second shape (32) in which the outer surface (21a) includes a part that is curved toward a top surface of the base portion (11). It is thus possible to provide a surface fastener (10) that exhibits different structures and/or properties between the machine direction and the orthogonal direction.

Description

面ファスナー及び成形装置Velcro fasteners and molding equipment
　本発明は、面ファスナー及び面ファスナーの製造に用いられる成形装置に関する。 The present invention relates to a hook-and-loop fastener and a molding device used for manufacturing the hook-and-loop fastener.
　従来から、複数のループを有する雌型の面ファスナー（以下、ループ部材と言う）と、そのループ部材に対して着脱可能な雄型の面ファスナー（以下、雄型の面ファスナーを単純に面ファスナーと言う）とが組み合わされて用いられる面ファスナー製品が知られている。面ファスナーは、例えば、平板状のベース部と、そのベース部から突出するとともにきのこ状等の形態を有する複数の係合素子とを有する。 Conventionally, there have been two types of hook-and-loop fasteners: a female-type hook-and-loop fastener (hereinafter referred to as a loop member) having multiple loops, and a male-type hook-and-loop fastener (hereinafter referred to simply as a hook-and-loop fastener) that can be attached to and detached from the loop member. Hook-and-loop fastener products are known that are used in combination with A hook-and-loop fastener has, for example, a flat base portion and a plurality of engaging elements that protrude from the base portion and have a shape such as a mushroom shape.
　面ファスナーは、現在、多種多様な商品に広く使用されており、例えば使い捨ておむつ、乳幼児のおむつカバー、手足の関節などを保護するサポーター、腰用コルセット（腰痛ベルト）、手袋などのような身体に対して着脱させる商品にも用いられている。また、使い捨ておむつ等に用いられる面ファスナーの一例が、国際公開第２０１７／１０９９０２号（特許文献１）に開示されている。 Hook-and-loop fasteners are currently widely used in a wide variety of products, including disposable diapers, diaper covers for infants, supports to protect the joints of limbs, waist corsets (lower back pain belts), gloves, etc. It is also used for products that can be attached and detached from the body. Further, an example of a hook-and-loop fastener used for disposable diapers and the like is disclosed in International Publication No. 2017/109902 (Patent Document 1).
　特許文献１に記載されている面ファスナーは、ベース部と、ベース部から突出する複数の係合素子とを有する。特許文献１の各係合素子は、ベース部から立ち上がるステム部と、ステム部の上端部に一体的に形成される円盤状の係合頭部とをそれぞれ有する。係合頭部には、係合頭部の外周縁部から突出する複数の微小な爪部が設けられている。 The hook-and-loop fastener described in Patent Document 1 includes a base portion and a plurality of engagement elements protruding from the base portion. Each engagement element of Patent Document 1 has a stem portion rising from a base portion, and a disc-shaped engagement head integrally formed at the upper end portion of the stem portion. The engagement head is provided with a plurality of minute claws that protrude from the outer peripheral edge of the engagement head.
　このような特許文献１の面ファスナーは、一次成形を行う成形装置と、二次成形を行う加熱押圧装置とを有する製造装置を用いて製造される。成形装置は、一方向に回転する１つのダイホイールと、ダイホイールの外周面に対向して配される供給ノズルと、供給ノズルよりもダイホイールの回転方向の下流側に配されるピックアップローラーとを有する。 The hook-and-loop fastener of Patent Document 1 is manufactured using a manufacturing device that includes a molding device that performs primary molding and a heating press device that performs secondary molding. The molding device includes one die wheel that rotates in one direction, a supply nozzle arranged to face the outer peripheral surface of the die wheel, and a pickup roller arranged downstream of the supply nozzle in the rotational direction of the die wheel. has.
　ダイホイールは、金型となる円筒状の外側スリーブと、外側スリーブの内側に密接して配される円筒状の内側スリーブと、外側スリーブ及び内側スリーブを一方向に回転させる駆動ローラーとを備える。外側スリーブには、外側スリーブの外周面から内周面に貫通する複数の貫通孔が設けられている。内側スリーブの外周面には、複数の凹部が設けられている。加熱押圧装置は、上下一対の押圧ローラー（カレンダローラー）を有する。
　このような製造装置を用いることによって、係合頭部の外周縁部に微小な爪部が設けられた複数の係合素子を有する特許文献１の面ファスナーを製造することができる。 The die wheel includes a cylindrical outer sleeve that serves as a mold, a cylindrical inner sleeve that is closely disposed inside the outer sleeve, and a drive roller that rotates the outer sleeve and the inner sleeve in one direction. The outer sleeve is provided with a plurality of through holes that penetrate from the outer circumferential surface to the inner circumferential surface of the outer sleeve. A plurality of recesses are provided on the outer peripheral surface of the inner sleeve. The heating and pressing device has a pair of upper and lower pressing rollers (calendar rollers).
By using such a manufacturing apparatus, it is possible to manufacture the hook-and-loop fastener of Patent Document 1, which has a plurality of engaging elements in which minute claws are provided on the outer peripheral edge of the engaging head.
　一方、雄型の面ファスナーを製造する方法として、上述した１つのダイホイールを備えた成形装置を用いる代わりに、複数のキャビティが外周面部に設けられたダイホイールと、ダイホイールに対向して配される押圧ホイールとを備えるツインロールタイプの成形装置を用いる方法が知られている。 On the other hand, as a method for manufacturing a male hook-and-loop fastener, instead of using a molding device equipped with one die wheel as described above, a die wheel with a plurality of cavities provided on the outer circumferential surface and a die wheel arranged opposite to the die wheel are used. A method using a twin-roll type molding device equipped with a pressing wheel is known.
　このツインロールタイプの成形装置を用いる場合は、供給ノズルから、互いに対向するダイホイールと押圧ホイールとの間に向けて、溶融した合成樹脂材料が供給される。それにより、ダイホイールと押圧ホイールとの間でベース部が成形されるとともに、ダイホイールの外周面部で係合素子（又は、係合素子に成形される前の一次素子）が成形されるため、面ファスナーを連続的に製造することができる。 When using this twin-roll type molding device, molten synthetic resin material is supplied from a supply nozzle toward a space between a die wheel and a press wheel that face each other. As a result, the base part is formed between the die wheel and the pressing wheel, and the engagement element (or the primary element before being formed into the engagement element) is formed on the outer peripheral surface of the die wheel. Hook-and-loop fasteners can be manufactured continuously.
国際公開第２０１７／１０９９０２号International Publication No. 2017/109902
　上述したツインロールタイプの成形装置を用いて面ファスナーを製造する場合、ダイホイールと押圧ホイールとによって、例えば特許文献１の製造方法よりも厚さを薄くしたベース部を成形することが可能である。しかし、ツインロールタイプの成形装置の場合、例えば特許文献１の製造方法に比べて、溶融した合成樹脂材料をダイホイールの外周面部に設けた複数のキャビティに充填し難く、各係合素子に上述した微小な爪部を安定して設けることができない。従って、ツインロールタイプの成形装置では、微小な爪部が係合素子に形成される特許文献１の面ファスナーを製造することが難しかった。 When manufacturing a hook-and-loop fastener using the above-mentioned twin-roll type molding device, it is possible to mold a base portion that is thinner than, for example, the manufacturing method of Patent Document 1 using a die wheel and a pressing wheel. . However, in the case of a twin-roll type molding device, it is difficult to fill the plurality of cavities provided on the outer peripheral surface of the die wheel with the molten synthetic resin material compared to, for example, the manufacturing method of Patent Document 1, and each engagement element is It is not possible to stably provide a minute claw portion. Therefore, it is difficult to manufacture the hook-and-loop fastener of Patent Document 1 in which minute claw portions are formed on the engaging elements using a twin-roll type forming apparatus.
　一方、特許文献１のように供給ノズルから１つのダイホイールに合成樹脂を供給して面ファスナーを製造する場合、ツインロールタイプの成形装置に比べて、一次成形時にベース部の厚さを薄くして成形体を成形することが難しい。このため、面ファスナーの柔軟性を低下させ、また、面ファスナーの軽量化及びコストダウンを妨げる可能性があった。 On the other hand, when manufacturing a hook-and-loop fastener by supplying synthetic resin from a supply nozzle to one die wheel as in Patent Document 1, the thickness of the base part is made thinner during primary molding compared to a twin-roll type molding device. It is difficult to mold a compact. For this reason, the flexibility of the hook-and-loop fastener may be reduced, and furthermore, there is a possibility that weight reduction and cost reduction of the hook-and-loop fastener may be hindered.
　これに対し、近年では、１つのダイホイールを有する成形装置を用いて、薄いベース部を有する面ファスナーを製造するために、成形装置でベース部を備えた成形体（一次成形体）を成形した後に、例えば、得られた成形体のベース部を機械方向（ＭＤ）に沿って延伸して薄くする延伸加工を行うことが検討されている。 On the other hand, in recent years, in order to manufacture hook-and-loop fasteners with a thin base part using a molding machine with one die wheel, a molded body (primary molded body) with a base part is molded using a molding machine. Subsequently, for example, it has been considered to carry out a stretching process in which the base portion of the obtained molded body is stretched along the machine direction (MD) to make it thinner.
　しかし、特許文献１の成形装置を用いて得られる成形体（一次成形体）に対し、機械方向（ＭＤ）に沿った延伸加工を施す場合、延伸装置内でベース部が機械方向に引っ張られることにより、ベース部に機械方向に沿った破断を生じさせる可能性がある。 However, when stretching along the machine direction (MD) to a molded body (primary molded body) obtained using the forming apparatus of Patent Document 1, the base portion may be pulled in the machine direction within the stretching apparatus. This may cause the base portion to break along the machine direction.
　また、機械方向に延伸加工が施されて製造された面ファスナーでは、面ファスナーの直交方向（ＣＤ）における引き裂き強度が低下することがあり、例えば面ファスナーのベース部に力が加えられたとき等に、ベース部が直交方向に切れる直交方向の引き裂きが生じる可能性もある。このため、例えば面ファスナーを使い捨ておむつ等に利用する場合には、面ファスナーを引っ張りながら、使い捨ておむつのループ部材に係合させておむつの取付状態を保持するときに、延伸されたベース部に直交方向の引き裂き又は破断が生じる可能性が考えられる。なお、直交方向（ＣＤ）とは、製造時の機械方向（ＭＤ）に直交する方向を意味する。 In addition, in hook-and-loop fasteners manufactured by stretching in the machine direction, the tear strength in the orthogonal direction (CD) of the hook-and-loop fastener may decrease, for example, when force is applied to the base of the hook-and-loop fastener. Additionally, orthogonal tearing, in which the base portion is torn in an orthogonal direction, may occur. For this reason, for example, when using a hook-and-loop fastener in a disposable diaper, etc., when the hook-and-loop fastener is pulled and engaged with the loop member of the disposable diaper to maintain the attached state of the diaper, the hook-and-loop fastener is perpendicular to the stretched base portion. It is possible that directional tearing or rupture may occur. Note that the orthogonal direction (CD) means a direction perpendicular to the machine direction (MD) during manufacturing.
　上述のような課題に対して、例えば機械方向（ＭＤ）と直交方向（ＣＤ）とに関して構造や強度等に差を生じさせるような面ファスナーを開発することが望まれてきている。 In order to solve the above-mentioned problems, it has been desired to develop a hook-and-loop fastener that has a difference in structure, strength, etc., for example, in the machine direction (MD) and the orthogonal direction (CD).
　本発明は上記従来の課題に鑑みてなされたものであって、その目的は、機械方向と直交方向の間で異なる構造及び／又は性質を示す面ファスナーを提供すること、並びに、そのような面ファスナーの製造に用いられる成形装置を提供することにある。 The present invention has been made in view of the above-mentioned conventional problems, and its objects are to provide a hook-and-loop fastener that exhibits different structures and/or properties between the machine direction and the orthogonal direction, and to An object of the present invention is to provide a molding device used for manufacturing fasteners.
　上記目的を達成するために、本発明により提供される面ファスナーは、ベース部と、前記ベース部に一体的に形成される複数の係合素子とを有し、各係合素子は、前記ベース部の表面から前記ベース部の厚さ方向に突出するステム部と、前記ステム部の先端部に形成される係合頭部とを有し、前記ステム部の少なくとも上端部における前記厚さ方向に直交する断面は、円形又は円形に近い形状を有し、前記係合頭部は、前記ステム部の先端部から前記厚さ方向に直交する方向の全体に拡がる形状を有する合成樹脂製の面ファスナーであって、前記ステム部の下半部は、前記係合素子を機械方向から見た第１形状において、前記機械方向に直交する直交方向に向く外面がストレート状又は略ストレート状に形成される部分を含み、且つ、前記係合素子を前記直交方向から見た第２形状において、前記機械方向に向く外面が前記ベース部の表面に向けて湾曲する部分を含むものである。 In order to achieve the above object, a hook-and-loop fastener provided by the present invention includes a base part and a plurality of engaging elements integrally formed with the base part, each engaging element being connected to the base part. a stem portion protruding from a surface of the base portion in the thickness direction of the base portion; and an engaging head formed at a distal end portion of the stem portion; A hook-and-loop fastener made of synthetic resin, wherein the orthogonal cross section has a circular or nearly circular shape, and the engaging head has a shape that extends from the tip of the stem part to the entire direction perpendicular to the thickness direction. In the lower half of the stem portion, in a first shape when the engaging element is viewed from the machine direction, an outer surface facing in a direction orthogonal to the machine direction is formed in a straight shape or a substantially straight shape. and a second shape when the engaging element is viewed from the orthogonal direction, the outer surface facing the machine direction is curved toward the surface of the base portion.
　本発明の面ファスナーにおいて、前記ステム部は、前記第２形状において、前記機械方向に向く前記外面がストレート状又は略ストレート状に形成される部分を、前記ステム部の上半部に含み、前記第２形状のストレート状又は略ストレート状に形成される部分は、前記第１形状のストレート状又は略ストレート状に形成される部分よりも短い範囲に形成されていることが好ましい。 In the hook-and-loop fastener of the present invention, the stem portion includes, in the second shape, a portion in the upper half portion of the stem portion in which the outer surface facing the machine direction is formed in a straight shape or a substantially straight shape; It is preferable that the straight or substantially straight portion of the second shape is formed in a shorter range than the straight or substantially straight portion of the first shape.
　また、本発明により提供される別の形態の面ファスナーは、ベース部と、前記ベース部に一体的に形成される複数の係合素子とを有し、各係合素子は、前記ベース部の表面から前記ベース部の厚さ方向に突出するステム部と、前記ステム部の先端部に形成される係合頭部とを有し、前記ステム部の少なくとも上端部における前記厚さ方向に直交する断面は、円形又は円形に近い形状を有し、前記係合頭部は、前記ステム部の先端部から前記厚さ方向に直交する方向の全体に拡がる形状を有する合成樹脂製の面ファスナーであって、前記係合素子を機械方向から見たときに、前記ステム部の前記ベース部に連結する連結部における前記機械方向に直交する直交方向の長さを第１寸法とし、前記係合素子を前記直交方向から見たときに、前記ステム部の前記連結部における前記機械方向の長さを第２寸法とした場合、前記ステム部は、前記第２寸法が前記第１寸法よりも大きい形状を有し、互いに係合する前記面ファスナーとループ部材とが前記機械方向及び前記直交方向に沿って剥離されるときの前記面ファスナーにおける剥離強度を、それぞれＭＤ剥離強度及びＣＤ剥離強度と規定した場合、前記ステム部は、前記ＣＤ剥離強度が前記ＭＤ剥離強度よりも大きくなる形状を有するものである。 Another aspect of the hook-and-loop fastener provided by the present invention includes a base portion and a plurality of engaging elements integrally formed with the base portion, each engaging element being connected to the base portion. It has a stem portion that protrudes from the surface in the thickness direction of the base portion, and an engagement head formed at the tip of the stem portion, and is perpendicular to the thickness direction at least at the upper end portion of the stem portion. The hook-and-loop fastener is made of a synthetic resin and has a cross section having a circular or nearly circular shape, and the engaging head has a shape that extends from the tip of the stem portion to the entire direction perpendicular to the thickness direction. When the engaging element is viewed from the machine direction, the length of the connecting part of the stem part connected to the base part in the orthogonal direction perpendicular to the machine direction is defined as a first dimension, and the engaging element is When the length of the connecting portion of the stem portion in the machine direction is the second dimension when viewed from the orthogonal direction, the stem portion has a shape in which the second dimension is larger than the first dimension. and the peel strength of the hook and loop fastener when the hook and loop member and the loop member that engage with each other are peeled off along the machine direction and the orthogonal direction are respectively defined as MD peel strength and CD peel strength. , the stem portion has a shape such that the CD peel strength is greater than the MD peel strength.
　本発明により提供される更に別の形態の面ファスナーは、ベース部と、前記ベース部に一体的に形成される複数の係合素子とを有し、各係合素子は、前記ベース部の表面から前記ベース部の厚さ方向に突出するステム部と、前記ステム部の先端部に形成される係合頭部とを有し、前記ステム部の少なくとも上端部における前記厚さ方向に直交する断面は、円形又は円形に近い形状を有し、前記係合頭部は、前記ステム部の先端部から前記厚さ方向に直交する方向の全体に拡がる形状を有する合成樹脂製の面ファスナーであって、前記面ファスナーの機械方向に直交する直交方向に沿った部分を前記厚さ方向に湾曲させるときのＣＤ柔軟性が、前記面ファスナーの前記機械方向に沿った部分を前記厚さ方向に湾曲させるときのＭＤ柔軟性よりも高いものである。 Yet another aspect of the hook-and-loop fastener provided by the present invention includes a base portion and a plurality of engaging elements integrally formed with the base portion, each engaging element being arranged on a surface of the base portion. a stem portion protruding from the base portion in the thickness direction, and an engaging head formed at the distal end portion of the stem portion, and a cross section perpendicular to the thickness direction at least at the upper end portion of the stem portion; is a synthetic resin hook-and-loop fastener having a circular or nearly circular shape, and the engaging head having a shape that extends from the tip of the stem portion to the entire direction perpendicular to the thickness direction, , CD flexibility when bending a portion of the hook-and-loop fastener along the orthogonal direction orthogonal to the machine direction in the thickness direction causes the portion of the hook-and-loop fastener along the machine direction to curve in the thickness direction. This is higher than the MD flexibility at the time.
　本発明の面ファスナーにおいて、複数の前記係合素子は、前記機械方向に沿って一定のピッチ間隔で一列に配されることにより素子列を形成し、複数の前記素子列は、前記直交方向に一定の間隔で配置され、各素子列の前記係合素子は、前記直交方向に隣り合う前記素子列の前記係合素子の位置に対し、前記機械方向に前記ピッチ間隔の半分の大きさでずらされた位置に配され、前記係合素子は、前記機械方向に関して、各係合素子の前記ステム部の形成範囲が、前記直交方向に隣り合う前記素子列における前記係合素子の前記ステム部の形成範囲に対して重なる部分を有する位置に配されていることが好ましい。
　また本発明において、各係合素子は、前記係合頭部の外周縁部から前記直交方向に突出する少なくとも１つの爪部を有することが好ましい。 In the hook-and-loop fastener of the present invention, the plurality of engaging elements are arranged in a line at constant pitch intervals along the machine direction to form an element row, and the plurality of element rows are arranged in a row in the orthogonal direction. The engaging elements of each element row are arranged at regular intervals, and are shifted in the machine direction by half the pitch interval with respect to the positions of the engaging elements of the element rows adjacent in the orthogonal direction. The engagement element is arranged in such a position that, with respect to the machine direction, the formation range of the stem portion of each engagement element is the same as that of the stem portion of the engagement element in the element rows adjacent to each other in the orthogonal direction. It is preferable that it is placed at a position that has an overlapping portion with respect to the formation range.
Further, in the present invention, it is preferable that each engagement element has at least one claw portion protruding from the outer peripheral edge of the engagement head in the orthogonal direction.
　次に、本発明により提供される成形装置は、一方向に回転するダイホイールと、前記ダイホイールに向けて溶融した合成樹脂を供給する供給ノズルとを有し、ベース部に複数の係合素子が設けられ、各係合素子が、前記ベース部の表面から前記ベース部の厚さ方向に突出するステム部と、前記ステム部の先端部に形成される係合頭部とを有する面ファスナーの製造に用いられる成形装置において、前記ダイホイールは、少なくとも１つの円筒状のスリーブと、前記スリーブを回転させる駆動ローラーとを有し、前記スリーブは、前記スリーブの外周面から内周面に貫通する複数の貫通孔を有し、複数の前記貫通孔は、機械方向に沿って一定の孔ピッチ間隔で一列に配されることにより孔列を形成し、複数の前記孔列は、前記機械方向に直交する直交方向に一定の間隔で配置され、各孔列の前記貫通孔は、前記直交方向に隣り合う前記孔列の前記貫通孔の位置に対し、前記機械方向に前記孔ピッチ間隔の半分の大きさでずらされた位置に配され、前記貫通孔は、前記機械方向に関して、各貫通孔の形成範囲が、前記直交方向に隣り合う前記孔列における前記貫通孔の形成範囲に対して重なる部分を有する位置に配されているものである。 Next, the molding device provided by the present invention includes a die wheel that rotates in one direction, a supply nozzle that supplies molten synthetic resin toward the die wheel, and a plurality of engagement elements on a base portion. is provided, and each engaging element has a stem portion protruding from the surface of the base portion in the thickness direction of the base portion, and an engaging head formed at a distal end portion of the stem portion. In the molding device used for manufacturing, the die wheel has at least one cylindrical sleeve and a drive roller that rotates the sleeve, and the sleeve penetrates from the outer peripheral surface to the inner peripheral surface of the sleeve. It has a plurality of through holes, the plurality of through holes are arranged in a row at a constant hole pitch interval along the machine direction to form a hole row, and the plurality of hole rows are arranged in a row along the machine direction at a constant hole pitch interval. The through-holes of each hole row are arranged at regular intervals in orthogonal directions, and the through-holes of each hole row are half the hole pitch interval in the machine direction with respect to the positions of the through-holes of the hole rows adjacent in the orthogonal direction. The through-holes are arranged at positions shifted in size, and the through-holes are arranged in a portion where, with respect to the machine direction, the formation range of each through-hole overlaps with the formation range of the through-holes in the hole rows adjacent in the orthogonal direction. It is placed in a position with
　本発明によれば、機械方向と直交方向の間で異なる構造及び／又は性質を示す面ファスナーを提供することができる。 According to the present invention, it is possible to provide a hook-and-loop fastener that exhibits different structures and/or properties between the machine direction and the orthogonal direction.
本発明の実施形態に係る面ファスナーの一部を上側から撮影した写真の写しである。It is a copy of a photograph taken from above of a part of the hook-and-loop fastener according to the embodiment of the present invention. 図１に示した面ファスナーの係合素子を上側から撮影した写真の写しである。2 is a copy of a photograph taken from above of the engaging element of the hook-and-loop fastener shown in FIG. 1. 図１に示した面ファスナーの係合素子を機械方向から撮影した写真の写しである。2 is a copy of a photograph taken from the machine direction of the engaging element of the hook-and-loop fastener shown in FIG. 1. 図１に示した面ファスナーの係合素子を直交方向から撮影した写真の写しである。2 is a copy of a photograph of the engaging element of the hook-and-loop fastener shown in FIG. 1 taken from an orthogonal direction. 図１に示した面ファスナーを製造する製造装置を模式的に説明する模式図である。FIG. 2 is a schematic diagram schematically illustrating a manufacturing apparatus for manufacturing the hook-and-loop fastener shown in FIG. 1. FIG. 図５に示した製造装置の成形装置が備える外側スリーブの一部を模式的に示す模式図である。FIG. 6 is a schematic diagram schematically showing a part of the outer sleeve included in the molding device of the manufacturing device shown in FIG. 5; 一次成形工程で成形される一次成形体を模式的に示す斜視図である。FIG. 2 is a perspective view schematically showing a primary molded body formed in a primary molding process. 剥離強度試験について説明する説明図である。It is an explanatory view explaining a peel strength test. 剥離強度試験について説明する別の説明図である。It is another explanatory diagram explaining a peel strength test. 面ファスナーの柔軟性を測定する試験装置を模式的に示す模式図である。FIG. 2 is a schematic diagram schematically showing a test device for measuring the flexibility of a hook-and-loop fastener. 図１０の試験装置で面ファスナーを押圧した状態を模式的に示す模式図である。FIG. 11 is a schematic diagram schematically showing a state in which the hook-and-loop fastener is pressed by the testing device of FIG. 10;
　以下、本発明の好適な実施の形態について、図面を参照しながら詳細に説明する。なお、本発明は、以下で説明する実施形態に何ら限定されるものではなく、本発明と実質的に同一な構成を有し、かつ、同様な作用効果を奏しさえすれば、多様な変更が可能である。例えば、本発明の面ファスナーの長さ寸法（機械方向ＭＤにおける寸法）及び幅寸法（直交方向ＣＤにおける寸法）は特に限定されず、面ファスナーを切断すること等により、任意の形状を有することが可能である。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and various modifications may be made as long as they have substantially the same configuration as the present invention and achieve similar effects. It is possible. For example, the length dimension (dimension in the machine direction MD) and width dimension (dimension in the orthogonal direction CD) of the hook-and-loop fastener of the present invention are not particularly limited, and can have any shape by cutting the hook-and-loop fastener. It is possible.
　図１は、本実施形態に係る面ファスナーの一部を上側から撮影した写真の写しである。図２～図４は、それぞれ、本実施形態に係る面ファスナーの１つの係合素子を上側から撮影した写真（平面視）、機械方向側から撮影した写真（正面視又は背面視）、及び直交方向側から撮影した写真（側面視）の写しである。 FIG. 1 is a copy of a photograph taken from above of a part of the hook-and-loop fastener according to this embodiment. 2 to 4 are a photograph taken from above (plan view), a photograph taken from the machine direction side (front view or rear view), and an orthogonal photograph of one engaging element of the hook-and-loop fastener according to the present embodiment, respectively. This is a copy of a photograph taken from the direction (side view).
　なお、以下の説明において、前後方向は、長尺に成形される面ファスナー及び一次成形体の長さ方向である。また、前後方向は、面ファスナーの製造工程において、面ファスナー又は一次成形体が搬送される機械方向ＭＤに沿った方向（第１方向）である。
　左右方向は、長さ方向に直交し、且つ、面ファスナーにおけるベース部の平坦な上面（第１面）又は下面（第２面）に沿った幅方向を言う。この場合、左右方向及び幅方向は、機械方向ＭＤに直交する直交方向ＣＤに沿った方向（第２方向）である。
　上下方向は、ベース部の平坦な上面又は下面に直交する方向に沿った高さ方向（又はベース部の厚さ方向）であり、また、前後方向と左右方向とに直交する方向である。この場合、ベース部に対して係合素子が突出する側の向きを上下方向の上側とし、その反対の向きを下側とする。 In addition, in the following description, the front-back direction is the length direction of the hook-and-loop fastener and the primary molded object which are formed into a long length. Further, the front-rear direction is a direction (first direction) along the machine direction MD in which the hook-and-loop fastener or the primary formed body is conveyed in the hook-and-loop fastener manufacturing process.
The left-right direction refers to the width direction that is perpendicular to the length direction and along the flat upper surface (first surface) or lower surface (second surface) of the base portion of the hook-and-loop fastener. In this case, the left-right direction and the width direction are directions (second direction) along the orthogonal direction CD orthogonal to the machine direction MD.
The up-down direction is a height direction (or a thickness direction of the base part) along a direction perpendicular to the flat upper surface or lower surface of the base part, and is also a direction perpendicular to the front-back direction and the left-right direction. In this case, the direction of the side where the engaging element projects with respect to the base portion is defined as the upper side in the vertical direction, and the opposite direction is defined as the lower side.
　本実施形態に係る面ファスナー１０は、後述するように図５に示した成形装置６０、加熱押圧装置７０、及び延伸装置８０を有する製造装置５０を用いて、製造装置５０の機械方向ＭＤに長い形状に製造される。 The hook-and-loop fastener 10 according to the present embodiment is manufactured by using a manufacturing apparatus 50 having a forming apparatus 60, a heating press apparatus 70, and a stretching apparatus 80 shown in FIG. Manufactured into shapes.
　面ファスナー１０は、ポリプロピレン、ポリエステル、ナイロン、ポリブチレンテレフタレート、又はそれらの共重合体などの熱可塑性樹脂により形成されている。なお、面ファスナー１０の材質は特に限定されず、面ファスナー１０は、例えば生分解樹脂、植物由来樹脂、又はリサイクルにより得られる熱可塑性樹脂を用いて形成されていてもよい。 The hook-and-loop fastener 10 is made of thermoplastic resin such as polypropylene, polyester, nylon, polybutylene terephthalate, or a copolymer thereof. Note that the material of the hook-and-loop fastener 10 is not particularly limited, and the hook-and-loop fastener 10 may be formed using, for example, a biodegradable resin, a plant-derived resin, or a thermoplastic resin obtained by recycling.
　面ファスナー１０は、図１～図４に示すように、厚さが薄い平板状のベース部１１と、ベース部１１の上面から突出するとともにマッシュルームのような形状を有する複数の係合素子２０とを有する。ベース部１１は、面ファスナー１０の製造時における機械方向ＭＤに沿って長く形成されている。ベース部１１は、適切な強度と適切な可撓性を確保できる一定の厚さを有する。ベース部１１の上面（第１面）と、上面の反対側に配される下面（第２面）は、それぞれ平坦又は略平坦で、且つ、互いに平行に形成されている。 As shown in FIGS. 1 to 4, the hook-and-loop fastener 10 includes a flat base portion 11 with a thin thickness, and a plurality of engaging elements 20 that protrude from the upper surface of the base portion 11 and have a mushroom-like shape. has. The base portion 11 is formed to be long along the machine direction MD when the hook and loop fastener 10 is manufactured. The base portion 11 has a certain thickness that ensures appropriate strength and flexibility. The upper surface (first surface) of the base portion 11 and the lower surface (second surface) disposed on the opposite side of the upper surface are each flat or approximately flat, and are formed parallel to each other.
　各係合素子２０は、ベース部１１の上面から上方に突出するステム部２１と、ステム部２１の上端部に一体的に形成される円盤状の係合頭部２２と、係合頭部２２の外周縁部から直交方向ＣＤに沿って小さく外側に突出する２つの微小な爪部２３とを有する。 Each engagement element 20 includes a stem portion 21 that projects upward from the upper surface of the base portion 11, a disk-shaped engagement head 22 that is integrally formed at the upper end of the stem portion 21, and an engagement head 22 that is integrally formed at the upper end of the stem portion 21. It has two minute claw portions 23 that protrude outward from the outer peripheral edge along the orthogonal direction CD.
　ここで、係合素子２０を機械方向ＭＤから見たときのステム部２１の形状をステム部２１の第１形状３１と規定し、係合素子２０を直交方向ＣＤから見たときのステム部２１の形状をステム部２１の第２形状３２と規定する。この場合、各係合素子２０のステム部２１（特に、ステム部２１の下半部）は、面ファスナー１０の製造工程において後述する機械方向ＭＤに沿った延伸加工が施されることによって、ステム部２１の第１形状３１（図３を参照）とステム部２１の第２形状３２（図４を参照）とが互いに異なる形状に形成されている。 Here, the shape of the stem portion 21 when the engaging element 20 is viewed from the machine direction MD is defined as a first shape 31 of the stem portion 21, and the shape of the stem portion 21 when the engaging element 20 is viewed from the orthogonal direction CD is defined as a first shape 31 of the stem portion 21. The shape is defined as the second shape 32 of the stem portion 21. In this case, the stem portion 21 (particularly the lower half of the stem portion 21) of each engagement element 20 is stretched along the machine direction MD, which will be described later, in the manufacturing process of the hook-and-loop fastener 10. A first shape 31 (see FIG. 3) of the portion 21 and a second shape 32 (see FIG. 4) of the stem portion 21 are formed to be different from each other.
　本実施形態の係合素子２０では、ステム部２１の第１形状３１と第２形状３２とが、ステム部２１の主に下半部において互いに相違しており、ステム部２１の第１形状３１の下半部は、ステム部２１の第２形状３２の下半部よりも細く形成されている。このため、係合素子２０は、例えば係合素子２０の上側から力を受けたときに、機械方向ＭＤよりも直交方向ＣＤにたわみ易く形成されている。なお、ステム部２１の上半部と下半部とは、それぞれ、ステム部２１において、ステム部２１の高さ方向における中央位置でステム部２１を仕切った場合に、その中央位置よりもベース部１１から離れた側の部分と、その中央位置よりもベース部１１に近い側の部分とを意味する。 In the engagement element 20 of this embodiment, the first shape 31 and the second shape 32 of the stem portion 21 are different from each other mainly in the lower half of the stem portion 21, and the first shape 31 of the stem portion 21 The lower half portion is formed to be thinner than the lower half portion of the second shape 32 of the stem portion 21 . For this reason, the engagement element 20 is formed to be more flexible in the orthogonal direction CD than in the machine direction MD, for example, when a force is applied from above the engagement element 20. Note that the upper half and the lower half of the stem portion 21 respectively refer to the base portion of the stem portion 21 that is closer to the base portion than the center position when the stem portion 21 is partitioned at the center position in the height direction of the stem portion 21. 11, and a portion closer to the base portion 11 than the central position thereof.
　ステム部２１の形状についてより具体的に説明すると、係合素子２０を機械方向ＭＤから見た正面視（図３）又は背面視において、ステム部２１の第１形状３１は、ステム部２１の直交方向ＣＤに向く外面２１ａが、ステム部２１の係合頭部２２に連結する上端の位置から、ステム部２１のベース部１１に連結する下端（連結部）の位置までの略全体にかけて、まっすぐに延びるストレート状、又はまっすぐに近いラインに沿って延びる略ストレート状に形成されている。また、ステム部２１の第１形状３１において、ステム部２１の直交方向ＣＤに向く外面２１ａとベース部１１の上面との間には、約９５°の角度が形成されている。なお、第１形状３１において、ステム部２１の直交方向ＣＤに向く外面とベース部１１の上面との間の角度の大きさはこれに限定されない。 To explain the shape of the stem portion 21 more specifically, in a front view (FIG. 3) or rear view of the engaging element 20 in the machine direction MD, the first shape 31 of the stem portion 21 is perpendicular to the stem portion 21. The outer surface 21a facing the direction CD is straight from the upper end position of the stem part 21 connected to the engagement head 22 to the lower end position (connection part) of the stem part 21 connected to the base part 11. It is formed in an extending straight shape, or in a substantially straight shape extending along a nearly straight line. Further, in the first shape 31 of the stem portion 21, an angle of approximately 95° is formed between the outer surface 21a of the stem portion 21 facing in the orthogonal direction CD and the upper surface of the base portion 11. Note that in the first shape 31, the size of the angle between the outer surface of the stem portion 21 facing in the orthogonal direction CD and the upper surface of the base portion 11 is not limited to this.
　また本実施形態において、第１形状３１は、ステム部２１の直交方向ＣＤに向く外面２１ａが上下方向において凹状に湾曲する曲線部分を、例えばステム部２１のベース部１１に近接する下端部に含んで形成されていてもよい。この場合、第１形状３１における外面２１ａのストレート状又は略ストレート状に形成される部分は、ステム部２１の下半部における上下方向の範囲の５０％以上に、好ましくは６０％以上に亘って設けられることが好ましい。 In the present embodiment, the first shape 31 includes a curved portion in which the outer surface 21a of the stem portion 21 facing in the orthogonal direction CD is curved concavely in the vertical direction, for example, at the lower end portion of the stem portion 21 close to the base portion 11. It may be formed of. In this case, the straight or substantially straight portion of the outer surface 21a of the first shape 31 covers 50% or more, preferably 60% or more of the vertical range of the lower half of the stem portion 21. Preferably.
　本発明において、まっすぐに延びるストレート状、又はまっすぐに近いラインに沿って延びる略ストレート状とは、後述する略円柱状に形成されているステム部２１の外周面を機械方向ＭＤや直交方向ＣＤ等の方向から見たときに、そのステム部２１の外周面が上下方向に凹状に大きく又は明確に湾曲する曲線部分を含まない形状を意味している。例えば、ステム部２１の直交方向ＣＤに向く外面２１ａが、ベース部１１の上面に対して９５°よりも大きな角度（例えば、１００～１１０°の角度）を形成する場合であっても、当該外面２１ａがまっすぐに又はまっすぐに近いラインに沿って延びていれば、ストレート状又は略ストレート状に形成されているものとする。 In the present invention, a straight shape extending straight or a substantially straight shape extending along a nearly straight line means that the outer circumferential surface of the stem portion 21 formed in a substantially cylindrical shape, which will be described later, is This refers to a shape in which the outer circumferential surface of the stem portion 21 does not include a curved portion that is concavely curved or clearly curved in the vertical direction when viewed from the direction. For example, even if the outer surface 21a of the stem portion 21 facing in the orthogonal direction CD forms an angle larger than 95° (for example, an angle of 100 to 110°) with the upper surface of the base portion 11, the outer surface If 21a extends straight or along a nearly straight line, it is assumed that it is formed in a straight shape or a substantially straight shape.
　一方、係合素子２０を直交方向ＣＤから見た側面視（図４）において、ステム部２１の第２形状３２は、ステム部２１の機械方向ＭＤに向く外面２１ａがストレート状又は略ストレート状に形成される部分と、当該外面２１ａが上下方向に凹状に湾曲しながら延びる形状を示す曲線部分とを含んで形成されている。この第２形状３２において、ステム部２１の機械方向ＭＤに向く外面２１ａがストレート状又は略ストレート状に形成される部分は、ステム部２１の主に上半部に設けられており、また、図３に示す第１形状３１のストレート状又は略ストレート状に形成される部分よりも短い範囲で形成されている。第２形状３２において、ステム部２１の機械方向ＭＤに向く外面２１ａが湾曲して形成される曲線部分は、ステム部２１の主に下半部に設けられている。また、第２形状３２における外面２１ａの曲線部分は、ステム部２１の下半部における上下方向の範囲の３０％以上に、好ましくは４０％以上に亘って設けられることが好ましい。この第２形状３２における外面２１ａの曲線部分は、例えば第１形状３１の下端部に曲線部分が設けられる場合、その第１形状３１の曲線部分よりも長い範囲で形成される。 On the other hand, in a side view (FIG. 4) of the engaging element 20 seen from the orthogonal direction CD, the second shape 32 of the stem portion 21 has an outer surface 21a facing in the machine direction MD of the stem portion 21 in a straight or substantially straight shape. and a curved portion in which the outer surface 21a extends in a concave manner in the vertical direction. In this second shape 32, the portion where the outer surface 21a of the stem portion 21 facing in the machine direction MD is formed in a straight shape or a substantially straight shape is mainly provided in the upper half of the stem portion 21, and It is formed in a shorter range than the straight or substantially straight portion of the first shape 31 shown in FIG. In the second shape 32, the curved portion formed by curving the outer surface 21a of the stem portion 21 facing the machine direction MD is provided mainly in the lower half of the stem portion 21. The curved portion of the outer surface 21a of the second shape 32 is preferably provided over 30% or more, preferably 40% or more of the vertical range of the lower half of the stem portion 21. The curved portion of the outer surface 21a of the second shape 32 is longer than the curved portion of the first shape 31, for example, if the curved portion is provided at the lower end of the first shape 31.
　図３に示した第１形状３１における直交方向ＣＤに向く外面２１ａの形状は、図４に示した第２形状３２における機械方向ＭＤに向く外面２１ａの上半部の形状と類似する。例えば、ステム部２１の第２形状３２の上半部において、ステム部２１の機械方向ＭＤに向く外面２１ａは、ベース部１１の上面と平行な方向に対して約９５°の角度が設けられるように形成されている。また、ステム部２１の第２形状３２の下半部において、ステム部２１のベース部１１に近接して配される外面２１ａとベース部１１の上面との間には、約１６０°の角度が形成されている。第２形状３２において、ステム部２１の機械方向ＭＤに向く外面２１ａがストレート状又は略ストレート状に形成される部分は、第２形状３２におけるステム部２１の全体の高さ寸法（ベース部１１の上面からステム部２１の上端までの上下方向における寸法）の１／２以上、３／４以下の範囲に配されている。 The shape of the outer surface 21a facing in the orthogonal direction CD in the first shape 31 shown in FIG. 3 is similar to the shape of the upper half of the outer surface 21a facing in the machine direction MD in the second shape 32 shown in FIG. For example, in the upper half of the second shape 32 of the stem portion 21, the outer surface 21a of the stem portion 21 facing in the machine direction MD is formed at an angle of approximately 95° with respect to a direction parallel to the upper surface of the base portion 11. is formed. Further, in the lower half of the second shape 32 of the stem portion 21, there is an angle of approximately 160° between the outer surface 21a of the stem portion 21 disposed close to the base portion 11 and the upper surface of the base portion 11. It is formed. In the second shape 32, the portion where the outer surface 21a of the stem portion 21 facing in the machine direction MD is formed in a straight or substantially straight shape is the entire height dimension of the stem portion 21 in the second shape 32 (the height of the base portion 11). It is arranged in a range of 1/2 or more and 3/4 or less of the vertical dimension from the upper surface to the upper end of the stem portion 21.
　ステム部２１の第１形状３１（図３）と第２形状３２（図４）とを比較した場合、第２形状３２を示すステム部２１の下半部は、図４に示すように、第１形状３１を示すステム部２１の下半部に比べて、ステム部２１がベース部１１に近付くにつれてより太くなるように、ステム部２１の太さを大きく変化させている。 When comparing the first shape 31 (FIG. 3) and the second shape 32 (FIG. 4) of the stem portion 21, the lower half of the stem portion 21 exhibiting the second shape 32 has a second shape as shown in FIG. The thickness of the stem part 21 is changed significantly so that the stem part 21 becomes thicker as it approaches the base part 11 compared to the lower half part of the stem part 21 which shows one shape 31.
　また、第１形状３１では、ステム部２１のストレート状又は略ストレート状の外面２１ａが、ステム部２１のベース部１１に連結する下端まで延びており、このストレート状又は略ストレート状の外面２１ａとベース部１１の上面（表面）との間には、９０°に近い角度（略９５°）で急激に曲がる境界部が設けられている。 Further, in the first shape 31, the straight or substantially straight outer surface 21a of the stem portion 21 extends to the lower end connected to the base portion 11 of the stem portion 21, and the straight or substantially straight outer surface 21a A boundary portion that sharply bends at an angle close to 90° (approximately 95°) is provided between the base portion 11 and the upper surface (surface).
　これに対し、第２形状３２では、ステム部２１の下半部の外面２１ａが緩やかに大きく湾曲するとともに、ステム部２１の外面２１ａの傾斜がベース部１１に近付くにつれてなだらかになっている。このため、第２形状３２におけるステム部２１の外面２１ａは、ベース部１１の表面に滑らかに連続するように形成されている。 On the other hand, in the second shape 32, the outer surface 21a of the lower half of the stem portion 21 is gently and largely curved, and the slope of the outer surface 21a of the stem portion 21 becomes gentler as it approaches the base portion 11. Therefore, the outer surface 21a of the stem portion 21 in the second shape 32 is formed so as to be smoothly continuous with the surface of the base portion 11.
　各係合素子２０において、ステム部２１の上半部は、略円柱状に形成されている。このため、ステム部２１の上半部における外周面は、外周面の全周が滑らかに連続する曲面に形成されており、当該外周面に、角張った稜線や突起物等は設けられていない。また、ステム部２１は、ステム部２１の上端部における上下方向に直交する断面が円形又は円形に近い形状（略円形の形状）を有するように形成されている。 In each engagement element 20, the upper half of the stem portion 21 is formed into a substantially cylindrical shape. Therefore, the outer circumferential surface of the upper half of the stem portion 21 is formed into a curved surface that continues smoothly all around the circumference, and the outer circumferential surface is not provided with any angular ridge lines or protrusions. Further, the stem portion 21 is formed such that a cross section of the upper end portion of the stem portion 21 perpendicular to the vertical direction has a circular or nearly circular shape (substantially circular shape).
　ステム部２１のベース部１１に連結する連結部（すなわち、ステム部２１の下端）は、機械方向ＭＤの最大寸法が直交方向ＣＤの最大寸法よりも大きくなるように、機械方向ＭＤに長い楕円又は略楕円の形状に形成されている。なお本発明において、略楕円の形状とは、楕円に近い形状を意味し、例えば長円等の形状を含む。 The connecting portion (i.e., the lower end of the stem portion 21) that connects to the base portion 11 of the stem portion 21 is shaped like an ellipse or a long ellipse in the machine direction MD such that the maximum dimension in the machine direction MD is larger than the maximum dimension in the orthogonal direction CD. It is formed into a substantially elliptical shape. In the present invention, a substantially elliptical shape means a shape close to an ellipse, and includes, for example, an oval shape.
　ここで、ステム部２１の連結部について、係合素子２０を機械方向ＭＤから見たときの連結部の直交方向ＣＤに沿った長さを第１寸法Ｄ１と規定し、また、係合素子２０を直交方向ＣＤから見たときの連結部の機械方向ＭＤの長さを第２寸法Ｄ２と規定する。この場合、ステム部２１は、第２形状３２における連結部の第２寸法Ｄ２を、第１形状３１における連結部の第１寸法Ｄ１よりも大きくして形成されている。第２形状３２における連結部の第２寸法Ｄ２は、例えば、第１形状３１における連結部の第１寸法Ｄ１の１．５～２倍の長さを有する。 Here, regarding the connecting portion of the stem portion 21, the length of the connecting portion along the orthogonal direction CD when the engaging element 20 is viewed from the machine direction MD is defined as a first dimension D1, and The length of the connecting portion in the machine direction MD when viewed from the orthogonal direction CD is defined as a second dimension D2. In this case, the stem portion 21 is formed such that the second dimension D2 of the connecting portion in the second shape 32 is larger than the first dimension D1 of the connecting portion in the first shape 31. The second dimension D2 of the connecting portion in the second shape 32 is, for example, 1.5 to 2 times the length of the first dimension D1 of the connecting portion in the first shape 31.
　本実施形態において、複数の係合素子２０は、ベース部１１の上面に千鳥状の配置パターンで規則的に整列して設けられている。具体的に説明すると、係合素子２０は、機械方向ＭＤ（前後方向）に沿って一定のピッチ間隔で配置されることにより、係合素子列２６を形成している。複数の係合素子列２６は、直交方向ＣＤ（左右方向）に一定の間隔で配置されている。各係合素子列２６の係合素子２０は、直交方向ＣＤに隣り合う係合素子列２６の係合素子２０の位置に対し、係合素子２０の位置を機械方向ＭＤに１／２のピッチ間隔の大きさでずらされた位置に配されている。これによって、複数の係合素子２０は、直交方向ＣＤに互いに隣接する係合素子列２６間において、互い違いに又はジグザグ状に配置されている。 In the present embodiment, the plurality of engaging elements 20 are provided on the upper surface of the base portion 11 in a regular alignment in a staggered arrangement pattern. Specifically, the engaging elements 20 are arranged at constant pitch intervals along the machine direction MD (front-back direction), thereby forming an engaging element row 26. The plurality of engagement element rows 26 are arranged at regular intervals in the orthogonal direction CD (left-right direction). The engagement elements 20 of each engagement element row 26 are arranged at a pitch of 1/2 in the machine direction MD with respect to the position of the engagement elements 20 of the engagement element rows 26 adjacent in the orthogonal direction CD. They are placed at shifted positions based on the size of the interval. As a result, the plurality of engagement elements 20 are arranged alternately or in a zigzag pattern between the engagement element rows 26 adjacent to each other in the orthogonal direction CD.
　複数の係合素子２０は、機械方向ＭＤに関して、図１に示すように、各係合素子２０のステム部２１の形成範囲２７が、直交方向ＣＤに隣り合う係合素子列２６の係合素子２０の形成範囲２７に対して重なる部分を有する位置に配されている。言い換えると、各係合素子２０のステム部２１における機械方向ＭＤの一方側（例えば前方側）の端縁は、直交方向ＣＤに隣り合う係合素子列２６の係合素子２０のステム部２１における機械方向ＭＤの一方側（例えば前方側）の端縁と他方側（例えば後方側）の端縁との間に位置している。 As shown in FIG. 1, in the machine direction MD, the formation range 27 of the stem portion 21 of each of the engagement elements 20 corresponds to the engagement elements of the engagement element rows 26 adjacent to each other in the orthogonal direction CD. It is arranged at a position having an overlapping portion with respect to the formation range 27 of 20. In other words, the edge of the stem portion 21 of each engaging element 20 on one side (for example, the front side) in the machine direction MD is It is located between an edge on one side (for example, the front side) and an edge on the other side (for example, the rear side) in the machine direction MD.
　本実施形態では、（１）係合素子２０を直交方向ＣＤから見たときのステム部２１の第２形状３２が、ステム部２１の外面２１ａを湾曲させる部分を含んでいて、機械方向ＭＤから見たときのステム部２１の第１形状３１よりも太く形成されていること、（２）ステム部２１のベース部１１に連結する連結部が、機械方向ＭＤの第２寸法Ｄ２を直交方向ＣＤの第１寸法Ｄ１よりも大きくした楕円又は略楕円の形状に形成されること、及び、（３）係合素子２０の千鳥状の配置において、機械方向ＭＤにおける各係合素子２０のステム部２１の形成範囲２７が、直交方向ＣＤに隣り合う係合素子列２６の係合素子２０の形成範囲２７に重なること、のうちの少なくとも１つの構造が面ファスナー１０に設けられていることにより、ベース部１１における機械方向ＭＤの強度を効果的に高めることができる。このため、例えば面ファスナー１０の製造工程でベース部１１を形成する延伸加工において、機械方向ＭＤに引っ張られて延伸されるときに、ベース部１１に破断等の不具合を発生させ難くすることができる。 In the present embodiment, (1) the second shape 32 of the stem portion 21 when the engaging element 20 is viewed from the orthogonal direction CD includes a portion that curves the outer surface 21a of the stem portion 21, and when viewed from the machine direction MD; (2) The connecting portion of the stem portion 21 that connects to the base portion 11 is formed so that the second dimension D2 in the machine direction MD is larger than the first shape 31 of the stem portion 21 when viewed, and (2) (3) In the staggered arrangement of the engaging elements 20, the stem portion 21 of each engaging element 20 in the machine direction MD The formation range 27 of the engaging elements 20 of the engaging element rows 26 adjacent in the orthogonal direction CD overlaps with the formation range 27 of the engaging elements 20 of the engaging element rows 26 adjacent to each other in the orthogonal direction CD. The strength of the portion 11 in the machine direction MD can be effectively increased. For this reason, for example, in the stretching process for forming the base part 11 in the manufacturing process of the hook-and-loop fastener 10, when the base part 11 is pulled and stretched in the machine direction MD, it is possible to prevent defects such as breakage from occurring in the base part 11. .
　本実施形態の係合素子２０において、係合頭部２２は、上下方向に比較的薄く形成されており、ステム部２１の先端部から上下方向に直交する方向（すなわち、ベース部１１の上面と平行な方向）の全体に拡がる形状を有する。また、係合素子２０を上方側から見たときに、係合頭部２２は、図２に示すように直交方向ＣＤに長い楕円又は略楕円の形状を示す。この円盤状の係合頭部２２は、ステム部２１の上端（言い換えると、ステム部２１と係合頭部２２間の境界）に対して、外側へ向けて放射状に張り出して形成されている。なお、係合頭部の形状は、上方側から見たときに楕円又は略楕円を示す円盤の形状に限定されず、ステム部２１の先端部からベース部１１の表面と平行な方向に拡がって形成されていれば、上方側から見たときに真円、真円に近い形状、又は四角形等の多角形に近い形状を示す形状を有していてもよい。 In the engagement element 20 of this embodiment, the engagement head 22 is formed relatively thin in the vertical direction, and extends from the tip of the stem portion 21 in a direction perpendicular to the vertical direction (that is, from the top surface of the base portion 11). It has a shape that spreads over the entire area (parallel direction). Furthermore, when the engaging element 20 is viewed from above, the engaging head 22 has an elliptical or substantially elliptical shape that is long in the orthogonal direction CD, as shown in FIG. The disc-shaped engagement head 22 is formed to radially project outward from the upper end of the stem portion 21 (in other words, the boundary between the stem portion 21 and the engagement head 22). Note that the shape of the engaging head is not limited to the shape of an ellipse or a disk that is approximately elliptical when viewed from above, but may extend from the tip of the stem portion 21 in a direction parallel to the surface of the base portion 11. If it is formed, it may have a shape that is a perfect circle, a shape close to a perfect circle, or a shape close to a polygon such as a quadrilateral when viewed from above.
　各係合素子２０には、係合頭部２２の外周縁部から、直交方向ＣＤに沿って互いに反対向きに突出する左右一対の微小な爪部２３が設けられている。この場合、左右の爪部２３は、直交方向ＣＤに長い係合頭部２２の左右端部に配されている。また、係合頭部２２の外周縁部は、爪部２３が設けられていない非形成領域を有しており、本実施形態において、係合頭部２２における爪部２３の非形成領域は、機械方向ＭＤに向いて配されている。 Each engagement element 20 is provided with a pair of left and right minute claws 23 that protrude in opposite directions from the outer peripheral edge of the engagement head 22 along the orthogonal direction CD. In this case, the left and right claw portions 23 are arranged at the left and right ends of the engagement head 22 that is long in the orthogonal direction CD. Further, the outer peripheral edge of the engaging head 22 has a non-formed region where the claw portion 23 is not provided, and in this embodiment, the non-formed region of the claw portion 23 in the engaging head 22 is as follows. It is arranged facing the machine direction MD.
　左右の各爪部２３は、図３に示したように、係合頭部２２の外周縁部から突出方向の先端部に向けて、ベース部１１に近付くように斜め下方に垂れる形状を有する。また、各爪部２３は、係合素子２０を上方側から見た平面視において、爪部２３の係合頭部２２に接続する基端部が、係合頭部２２の機械方向ＭＤにおける寸法の最大値よりも小さくなるような、好ましくは当該最大値の２／３以下となるような微小なサイズに形成されている。 As shown in FIG. 3, each of the left and right claw portions 23 has a shape that hangs diagonally downward from the outer peripheral edge of the engagement head 22 toward the tip in the protruding direction so as to approach the base portion 11. In addition, each claw portion 23 has a base end portion connected to the engagement head portion 22 of the claw portion 23 that has a dimension in the machine direction MD of the engagement head portion 22 in a plan view when the engagement element 20 is viewed from above. The size is smaller than the maximum value of , preferably 2/3 or less of the maximum value.
　このような微小な爪部２３が各係合素子２０に設けられていることにより、面ファスナー１０にループ部材を係合させたときに、係合素子２０に係合したループ部材のループが爪部２３に引っ掛かり易くなるため、ループを係合素子２０からより外れ難くすることができる。また、爪部２３が係合頭部２２に対して微小なサイズで形成されていることにより、爪部２３の設置が面ファスナー１０の上面側における肌触り又は感触に与える影響を小さく抑えることができる。 Since such a minute claw portion 23 is provided on each engagement element 20, when the loop member is engaged with the hook-and-loop fastener 10, the loop of the loop member engaged with the engagement element 20 becomes a claw. Since the loop is easily caught on the portion 23, the loop can be made more difficult to come off from the engagement element 20. Furthermore, since the claw portion 23 is formed in a microscopic size with respect to the engaging head 22, the effect that the installation of the claw portion 23 has on the touch or feel on the top surface side of the hook-and-loop fastener 10 can be suppressed to a small extent. .
　なお本発明において、係合頭部は、ステム部の上端部から上下方向に直交する方向に拡がる形状に形成されていれば、係合頭部の形状及び大きさは特に限定されない。更に、爪部の形状、爪部の設置数、及び爪部の係合頭部からの突出方向等も特に限定されない。また、係合素子は、爪部を設けずに形成されていてもよい。１つの面ファスナーには、互いに形状が異なる複数種類の係合素子が設けられていてもよい。 In the present invention, the shape and size of the engaging head are not particularly limited as long as the engaging head is formed in a shape that extends from the upper end of the stem portion in a direction orthogonal to the up-down direction. Furthermore, the shape of the claws, the number of claws installed, the direction in which the claws project from the engaging head, etc. are not particularly limited. Moreover, the engaging element may be formed without providing a claw portion. One hook-and-loop fastener may be provided with a plurality of types of engagement elements having mutually different shapes.
　次に、上述した本実施形態の面ファスナー１０を製造する製造装置５０について、図５及び図６を参照しながら説明する。
　本実施形態の製造装置５０は、一次成形を行う成形装置６０と、成形装置６０により成形された一次成形体４０（図７を参照）に対して二次成形を行って二次成形体（プレファスナー体）を成形する加熱押圧装置７０と、得られた二次成形体に延伸加工を行う延伸装置８０とを有する。なお本発明において、プレファスナー体とは、延伸加工を行って面ファスナー１０を製造する場合に、延伸加工が施される前の成形体又は部材を意味する。 Next, a manufacturing apparatus 50 for manufacturing the above-described hook-and-loop fastener 10 of this embodiment will be described with reference to FIGS. 5 and 6.
The manufacturing device 50 of this embodiment includes a molding device 60 that performs primary molding, and a secondary molded product (preform) that performs secondary molding on the primary molded object 40 (see FIG. 7) molded by the molding device 60. It has a heating and pressing device 70 for forming a fastener body) and a stretching device 80 for stretching the obtained secondary formed body. In the present invention, the pre-fastener body means a molded body or member before being subjected to stretching when the hook-and-loop fastener 10 is manufactured by stretching.
　成形装置６０は、一方向（図面では反時計回り方向）に駆動回転するダイホイール６１と、ダイホイール６１の周面に対向して配され、溶融した合成樹脂材料を連続して供給する供給ノズル６５と、供給ノズル６５よりもダイホイール６１の回転方向下流側に配されるピックアップローラー６６とを有する。 The molding device 60 includes a die wheel 61 that is driven to rotate in one direction (counterclockwise in the drawing) and a supply nozzle that is disposed facing the circumferential surface of the die wheel 61 and continuously supplies a molten synthetic resin material. 65, and a pickup roller 66 disposed downstream of the supply nozzle 65 in the rotational direction of the die wheel 61.
　ダイホイール６１は、金型となる円筒状の外側スリーブ（外側円筒体）６２と、外側スリーブ６２の内側に密接して配される円筒状の内側スリーブ（内側円筒体）６３と、外側スリーブ６２及び内側スリーブ６３を一方向に回転させる駆動ローラー６４とを備える。駆動ローラー６４の内部には、冷却液を流通させる図示しない冷却ジャケットが設けられている。 The die wheel 61 includes a cylindrical outer sleeve (outer cylindrical body) 62 serving as a mold, a cylindrical inner sleeve (inner cylindrical body) 63 disposed closely inside the outer sleeve 62, and an outer sleeve 62. and a drive roller 64 that rotates the inner sleeve 63 in one direction. A cooling jacket (not shown) is provided inside the drive roller 64 to allow cooling fluid to flow therethrough.
　外側スリーブ６２には、外側スリーブ６２の外周面から内周面に貫通する複数の貫通孔６２ａが、一次成形体４０の後述する一次ステム部４３を成形するキャビティとして形成されている。各貫通孔６２ａは、外側スリーブ６２の外周面における円形が、外側スリーブ６２の内周面における円形よりも大きく形成される略円錐台の形状を有する。 In the outer sleeve 62, a plurality of through holes 62a penetrating from the outer peripheral surface to the inner peripheral surface of the outer sleeve 62 are formed as cavities for molding a primary stem portion 43, which will be described later, of the primary molded body 40. Each through hole 62a has a substantially truncated conical shape in which the outer peripheral surface of the outer sleeve 62 has a larger circular shape than the inner peripheral surface of the outer sleeve 62.
　外側スリーブ６２に設けられる複数の貫通孔６２ａの形成位置は、作製される二次成形体において係合素子２０が配設される位置に対応している。貫通孔６２ａの形成位置について具体的に説明すると、複数の貫通孔６２ａは、例えば図６に示すように、外側スリーブ６２に千鳥状の配置パターンで規則的に整列して設けられている。この場合、貫通孔６２ａは、機械方向ＭＤに沿って一定のピッチ間隔で配置されることにより、孔列６２ｂを形成している。複数の孔列６２ｂは、直交方向ＣＤに一定の間隔で配置されている。各孔列６２ｂの貫通孔６２ａは、直交方向ＣＤに隣り合う孔列６２ｂの貫通孔６２ａの位置に対し、貫通孔６２ａの位置を機械方向ＭＤに１／２のピッチ間隔の大きさでずらされた位置に配されている。これによって、複数の貫通孔６２ａは、左右方向に互いに隣接する孔列６２ｂ間において、互い違いに又はジグザグ状に配置されている。 The formation positions of the plurality of through holes 62a provided in the outer sleeve 62 correspond to the positions where the engagement elements 20 are arranged in the secondary molded body to be produced. To specifically explain the formation positions of the through holes 62a, the plurality of through holes 62a are provided in the outer sleeve 62 in regular alignment in a staggered arrangement pattern, as shown in FIG. 6, for example. In this case, the through holes 62a are arranged at constant pitch intervals along the machine direction MD, thereby forming a hole row 62b. The plurality of hole rows 62b are arranged at regular intervals in the orthogonal direction CD. The positions of the through holes 62a of each hole row 62b are shifted by a pitch interval of 1/2 in the machine direction MD with respect to the positions of the through holes 62a of the hole rows 62b adjacent to each other in the orthogonal direction CD. It is placed in the same position. As a result, the plurality of through holes 62a are arranged alternately or in a zigzag pattern between the hole rows 62b adjacent to each other in the left-right direction.
　また、複数の貫通孔６２ａは、機械方向ＭＤに関して、各貫通孔６２ａの形成範囲６２ｃが、直交方向ＣＤに隣り合う孔列６２ｂの貫通孔６２ａの形成範囲６２ｃに対して重なる部分を有する位置に配されている。このような位置関係で複数の貫通孔６２ａが外側スリーブ６２に形成されていることにより、面ファスナー１０を製造したときに、複数の係合素子２０を、直交方向ＣＤに隣り合う係合素子列２６間で係合素子２０の形成範囲２７が互いに重なり合うように安定して配置できる。 Further, the plurality of through holes 62a are located at positions where, in the machine direction MD, the formation range 62c of each through hole 62a overlaps with the formation range 62c of the through hole 62a of the adjacent hole row 62b in the orthogonal direction CD. It is arranged. By forming the plurality of through holes 62a in the outer sleeve 62 in such a positional relationship, when the hook-and-loop fastener 10 is manufactured, the plurality of engagement elements 20 can be arranged in rows of engagement elements adjacent in the orthogonal direction CD. The engagement elements 20 can be stably arranged so that the formation ranges 27 of the engagement elements 20 overlap each other between the engagement elements 26.
　内側スリーブ６３の外周面には、複数の凹溝部が形成されている。各凹溝部は、内側スリーブ６３の中心軸と平行な直交方向ＣＤに沿って直線状に、また、溶融した合成樹脂が流入可能な大きさで凹設されている。凹溝部は、内側スリーブ６３の周方向（機械方向ＭＤ）に沿って一定の間隔で形成されている。また、内側スリーブ６３の凹溝部の少なくとも一部は、ダイホイール６１が組み立てられたときに、外側スリーブ６２の内周面に形成された貫通孔６２ａの外周縁に交わるように設けられている。 A plurality of grooves are formed on the outer peripheral surface of the inner sleeve 63. Each of the grooves is recessed linearly along the orthogonal direction CD parallel to the central axis of the inner sleeve 63 and has a size that allows the molten synthetic resin to flow therein. The groove portions are formed at regular intervals along the circumferential direction (machine direction MD) of the inner sleeve 63. Furthermore, at least a portion of the groove portion of the inner sleeve 63 is provided so as to intersect with the outer circumferential edge of the through hole 62a formed in the inner circumferential surface of the outer sleeve 62 when the die wheel 61 is assembled.
　なお本発明において、内側スリーブの外周面に設ける凹部の形態は、本実施形態のような直線状の凹溝部に限定されない。本発明では、例えばジグザグ状に屈曲した凹溝部や、内側スリーブの外周面から直方体等の立体形状で窪んで形成される凹陥部等が、内側スリーブの外周面に設けられていてもよい。また、ダイホイールは、本実施形態のように外側と内側の２つのスリーブを有するものではなく、例えば、外周面から内周面に貫通する複数の貫通孔と、内周面に設けられる複数の凹溝部とを有する１つのスリーブを有して形成されていてもよい。 Note that in the present invention, the form of the recess provided on the outer circumferential surface of the inner sleeve is not limited to the linear groove as in this embodiment. In the present invention, the outer circumferential surface of the inner sleeve may be provided with, for example, a concave groove bent in a zigzag shape, or a concave portion recessed in a three-dimensional shape such as a rectangular parallelepiped from the outer circumferential surface of the inner sleeve. In addition, the die wheel does not have two sleeves, an outer and an inner sleeve, as in this embodiment, but has, for example, a plurality of through holes penetrating from the outer circumferential surface to the inner circumferential surface, and a plurality of through holes provided on the inner circumferential surface. The sleeve may be formed with one sleeve having a recessed groove portion.
　ピックアップローラー６６は、ダイホイール６１の外周面部で成形される一次成形体４０を上下から挟持して引っ張る一対の上側挟持ローラー６７及び下側挟持ローラー６８を有する。上側挟持ローラー６７及び下側挟持ローラー６８の各外周面部には、ポリウレタンエラストマー等のエラストマーにより形成される図示しない表面層が設けられている。 The pickup roller 66 has a pair of upper and lower clamping rollers 67 and 68 that clamp and pull the primary formed body 40 formed on the outer peripheral surface of the die wheel 61 from above and below. A surface layer (not shown) made of an elastomer such as a polyurethane elastomer is provided on each outer peripheral surface of the upper clamping roller 67 and the lower clamping roller 68.
　加熱押圧装置７０は、ピックアップローラー６６の下流側に配される上下一対の押圧ローラー（カレンダローラー）７１，７２を有する。上側押圧ローラー７１と下側押圧ローラー７２とは、所定の間隔を開けて対向して配されている。上側押圧ローラー７１及び下側押圧ローラー７２間の間隔は、図示しない高さ調整手段により調整可能である。 The heating and pressing device 70 has a pair of upper and lower pressing rollers (calendar rollers) 71 and 72 arranged downstream of the pickup roller 66. The upper pressing roller 71 and the lower pressing roller 72 are arranged facing each other with a predetermined interval therebetween. The distance between the upper pressing roller 71 and the lower pressing roller 72 can be adjusted by a height adjusting means (not shown).
　上側押圧ローラー７１は、内部に図示しない加熱源を備えており、上側押圧ローラー７１の表面温度は、面ファスナー１０（一次成形体４０）を形成する合成樹脂を軟化させることが可能な温度に設定される。なお本発明において、加熱押圧装置は、後述するように一次成形体４０の少なくとも一部を押圧して係合素子を形成することが可能であれば、その構造は特に限定されない。 The upper pressing roller 71 is equipped with a heating source (not shown) inside, and the surface temperature of the upper pressing roller 71 is set to a temperature that can soften the synthetic resin forming the hook-and-loop fastener 10 (primary molded body 40). be done. In the present invention, the structure of the heating and pressing device is not particularly limited as long as it can press at least a portion of the primary molded body 40 to form an engagement element as described later.
　延伸装置８０は、加熱押圧装置７０で成形されたプレファスナー体（二次成形体）に、少なくとも延伸加工を行うために、加熱押圧装置７０の下流側に設置されている。延伸装置８０は、具体的な図示を省略するが、プレファスナー体を延伸装置８０内に導入する供給部と、延伸加工された面ファスナー１０を下流側に送り出す排出部と、供給部及び排出部間に加工対象部材（すなわち、プレファスナー体又は面ファスナー１０）の搬送路に沿って配される複数の回転ローラーとを有する。 The stretching device 80 is installed downstream of the heating and pressing device 70 in order to perform at least a stretching process on the pre-fastener body (secondary molded object) formed by the heating and pressing device 70. Although specific illustrations are omitted, the stretching device 80 includes a supply section that introduces the pre-fastener body into the stretching device 80, a discharge section that sends out the stretched hook-and-loop fastener 10 downstream, and a supply section and a discharge section. It has a plurality of rotating rollers arranged along the conveyance path of the member to be processed (ie, the pre-fastener body or the hook-and-loop fastener 10).
　各回転ローラーは、加工対象部材を接触させながら回転することにより、加工対象部材をその回転速度に応じた速度で下流側に向けて搬送可能に形成されている。また、少なくとも一部の回転ローラーは、加工対象部材をローラー外周面に接触させることによって、予め設定された加熱温度で加工対象部材を加熱可能に形成されている。 Each rotating roller is configured to be able to convey the workpiece toward the downstream side at a speed corresponding to the rotational speed of the workpiece by rotating while contacting the workpiece. Furthermore, at least some of the rotating rollers are configured to be able to heat the workpiece at a preset heating temperature by bringing the workpiece into contact with the outer peripheral surface of the roller.
　延伸装置８０の回転ローラーには、プレファスナー体に加熱処理を行う加熱ローラーと、加熱ローラーとの間でプレファスナー体を延伸加工する延伸ローラーと、延伸ローラーの下流側に配される緩和ローラーとが含まれる。この場合、加熱ローラー、延伸ローラー、及び緩和ローラーは、加工対象部材の搬送路を上下に蛇行させるように設置される。 The rotating rollers of the stretching device 80 include a heating roller that heat-treats the pre-fastener body, a stretching roller that stretches the pre-fastener body between the heating roller, and a relaxing roller disposed downstream of the stretching roller. is included. In this case, the heating roller, the stretching roller, and the relaxing roller are installed so as to meander up and down the conveyance path of the workpiece.
　加熱ローラーは、一定の回転速度で回転することによってプレファスナー体を搬送するとともに、プレファスナー体をローラー表面に接触させることによって加熱する。また、加熱ローラーには、加熱ローラーに対向して配される支持ローラー（ニップローラー）が設けられており、加熱ローラーと支持ローラーは、プレファスナー体を上下から挟んで保持しながら、それぞれ一定の速度で回転する。この加熱ローラーによって、延伸加工を行う前のプレファスナー体を、延伸可能な温度に加熱できる。なお本実施形態において、延伸加工前の加熱処理を行う手段及び方法は特に限定されない。 The heating roller conveys the pre-fastener body by rotating at a constant rotational speed, and heats the pre-fastener body by bringing it into contact with the roller surface. In addition, the heating roller is provided with a support roller (nip roller) disposed opposite to the heating roller, and the heating roller and the support roller hold the pre-fastener body between the top and bottom while each holding the pre-fastener body at a certain level. Rotate at speed. This heating roller can heat the pre-fastener body before stretching to a temperature at which it can be stretched. Note that in this embodiment, the means and method for performing the heat treatment before stretching are not particularly limited.
　延伸ローラーは、加工対象部材をローラー表面に接触させながら、加熱ローラーよりも速い回転速度で回転するように制御される。例えば本実施形態において、延伸ローラーの回転速度は、加熱ローラーの回転速度の１１０％以上２００％以下に設定される。また、延伸ローラーの加熱温度は、加熱ローラーの加熱温度以上に、且つ、面ファスナー１０を形成する合成樹脂の融点よりも低く設定される。これにより、加熱ローラーと延伸ローラーとの間で、プレファスナー体に延伸加工を行うことができる。この延伸加工によって、プレファスナー体の後述する仮ベース部４１が機械方向ＭＤに沿って延伸されて、面ファスナー１０のベース部１１が形成される。 The stretching roller is controlled to rotate at a faster rotation speed than the heating roller while bringing the workpiece into contact with the roller surface. For example, in this embodiment, the rotation speed of the stretching roller is set to 110% or more and 200% or less of the rotation speed of the heating roller. Further, the heating temperature of the stretching roller is set to be higher than the heating temperature of the heating roller and lower than the melting point of the synthetic resin forming the hook-and-loop fastener 10. Thereby, the pre-fastener body can be stretched between the heating roller and the stretching roller. Through this stretching process, a temporary base portion 41 (described later) of the pre-fastener body is stretched along the machine direction MD, and the base portion 11 of the hook-and-loop fastener 10 is formed.
　緩和ローラーは、加工対象部材をローラー表面に接触させながら、延伸ローラーよりも遅い回転速度で回転するように制御される。緩和ローラーの加熱温度は、面ファスナー１０を形成する合成樹脂の融点よりも低く設定される。これにより、延伸ローラーと緩和ローラーとの間で、面ファスナー１０に加えられる張力を弱めて、面ファスナー１０の形状及び寸法を安定させることができる。 The relaxation roller is controlled to rotate at a slower rotation speed than the stretching roller while bringing the workpiece into contact with the roller surface. The heating temperature of the relaxation roller is set lower than the melting point of the synthetic resin forming the hook-and-loop fastener 10. Thereby, the tension applied to the hook-and-loop fastener 10 can be weakened between the stretching roller and the relaxation roller, and the shape and dimensions of the hook-and-loop fastener 10 can be stabilized.
　なお、上述した本実施形態の延伸装置８０の構造は一例に過ぎない。本発明において、延伸装置は、少なくとも成形装置の下流側に配され、且つ、一次成形装置又は加熱押圧装置から送り出されるプレファスナー体等の成形体を機械方向ＭＤに沿って延伸可能に形成されていれば、その構造は特に限定されない。 Note that the structure of the stretching device 80 of the present embodiment described above is only an example. In the present invention, the stretching device is disposed at least on the downstream side of the forming device, and is configured to be able to stretch along the machine direction MD a molded object such as a pre-fastener body sent out from the primary forming device or the heating press device. If so, the structure is not particularly limited.
　次に、上述した製造装置５０を用いて面ファスナー１０を製造する方法について説明する。
　本実施形態の製造方法は、一次成形装置６０を用いて図７に示すような一次成形体４０を成形する一次成形工程と、加熱押圧装置７０を用いて一次成形体４０の一部を変形させることによって係合素子２０を備えたプレファスナー体（不図示）を成形する二次成形工程と、延伸装置８０を用いてプレファスナー体に機械方向ＭＤに沿った延伸加工を行って面ファスナー１０を形成する延伸工程とを含む。 Next, a method for manufacturing the hook-and-loop fastener 10 using the manufacturing apparatus 50 described above will be described.
The manufacturing method of this embodiment includes a primary molding step of molding a primary molded body 40 as shown in FIG. The hook-and-loop fastener 10 is formed by performing a secondary forming process to form a pre-fastener body (not shown) equipped with the engaging elements 20, and by stretching the pre-fastener body along the machine direction MD using a stretching device 80. and a stretching step of forming.
　一次成形工程では、溶融した合成樹脂を供給ノズル６５からダイホイール６１の外周面に向けて連続的に供給する。これにより、供給ノズル６５とダイホイール６１との間で仮ベース部４１が連続的に成形される。また、ダイホイール６１の外側スリーブ６２に設けた貫通孔６２ａと内側スリーブ６３に設けた凹溝部とにより、複数の一次素子（仮素子）４２が仮ベース部４１と一体的に成形される。従って、この一次成形工程によって、図７に示す一次成形体４０が成形される。 In the primary molding step, molten synthetic resin is continuously supplied from the supply nozzle 65 toward the outer peripheral surface of the die wheel 61. As a result, the temporary base portion 41 is continuously formed between the supply nozzle 65 and the die wheel 61. Further, a plurality of primary elements (temporary elements) 42 are integrally molded with the temporary base portion 41 by the through hole 62a provided in the outer sleeve 62 of the die wheel 61 and the groove portion provided in the inner sleeve 63. Therefore, through this primary molding step, a primary molded body 40 shown in FIG. 7 is molded.
　このとき成形される一次成形体４０は、平板状の仮ベース部４１と、仮ベース部４１の上面に突出する複数の一次素子４２とを有する。仮ベース部４１は、製造される面ファスナー１０のベース部１１よりも厚く形成される。 The primary molded body 40 formed at this time has a flat temporary base portion 41 and a plurality of primary elements 42 protruding from the upper surface of the temporary base portion 41. The temporary base portion 41 is formed thicker than the base portion 11 of the hook-and-loop fastener 10 to be manufactured.
　一次素子４２は、二次成形工程で二次成形（押圧成形）が施されることにより、係合素子２０に変形する。複数の一次素子４２は、仮ベース部４１に千鳥状の配置パターンで設けられる。各一次素子４２は、仮ベース部４１から突出する円錐台状の一次ステム部４３と、一次ステム部４３の上面から上方に部分的に膨出する棒状のリブ部４４と、リブ部４４と一体的に形成されるとともにリブ部４４の両端部から突出する２つの突出部（一次爪部）４５とを有する。リブ部４４及び左右の突出部４５は、直交方向ＣＤに沿って形成されている。また、左右の突出部４５は、一次ステム部４３の上端面よりも外側に突出している。 The primary element 42 is transformed into the engagement element 20 by being subjected to secondary molding (press molding) in the secondary molding process. The plurality of primary elements 42 are provided on the temporary base portion 41 in a staggered arrangement pattern. Each primary element 42 includes a truncated conical primary stem portion 43 protruding from the temporary base portion 41, a bar-shaped rib portion 44 that partially bulges upward from the upper surface of the primary stem portion 43, and is integral with the rib portion 44. The rib portion 44 has two protruding portions (primary claw portions) 45 that are formed as shown in FIG. The rib portion 44 and the left and right protrusions 45 are formed along the orthogonal direction CD. Further, the left and right protrusions 45 protrude outward from the upper end surface of the primary stem portion 43.
　また、複数の一次素子４２は、外側スリーブ６２に設けられる複数の貫通孔６２ａの形成位置に対応して設けられるため、各一次素子４２の一次ステム部４３の機械方向ＭＤにおける形成範囲は、直交方向ＣＤに隣り合う素子列間で互いに重なり合うように形成されている。なお、一次素子４２は、一次ステム部４３の上面から上方に部分的に膨出する２つの突出部（一次爪部）４５を有していてもよい。この場合、後述する二次成形工程において、係合頭部２２の外周縁部から外側に向けて突出する４つの微小な爪部２３が形成される。 Further, since the plurality of primary elements 42 are provided corresponding to the formation positions of the plurality of through holes 62a provided in the outer sleeve 62, the formation range of the primary stem portion 43 of each primary element 42 in the machine direction MD is perpendicular to each other. Element rows adjacent in direction CD are formed so as to overlap each other. Note that the primary element 42 may have two protruding parts (primary claw parts) 45 that partially bulge upward from the upper surface of the primary stem part 43. In this case, in the secondary molding process described later, four minute claws 23 protruding outward from the outer peripheral edge of the engaging head 22 are formed.
　本実施形態の一次成形工程では、溶融した合成樹脂が、ダイホイール６１の外周面に担持されて冷却されながら半回転することにより、上述した一次成形体４０が成形される。その後、一次成形体４０は、ピックアップローラー６６によってダイホイール６１の外周面部から連続的に引き剥がされる。 In the primary molding step of this embodiment, the above-mentioned primary molded body 40 is molded by carrying the molten synthetic resin on the outer peripheral surface of the die wheel 61 and rotating it half a rotation while being cooled. Thereafter, the primary molded body 40 is continuously peeled off from the outer peripheral surface of the die wheel 61 by the pickup roller 66.
　次に、ダイホイール６１から引き剥がされた一次成形体４０は、二次成形工程を行う加熱押圧装置７０に向けて搬送され、加熱押圧装置７０の上側押圧ローラー７１と下側押圧ローラー７２の間に導入される。 Next, the primary formed body 40 peeled off from the die wheel 61 is conveyed toward a heating and pressing device 70 that performs a secondary molding process, and is transported between an upper pressing roller 71 and a lower pressing roller 72 of the heating pressing device 70. will be introduced in
　加熱押圧装置７０による二次成形工程では、一次成形体４０の仮ベース部４１が下側押圧ローラー７２によって下方から支持される。また、一次成形体４０の各一次素子４２の少なくとも上端部が、上側押圧ローラー７１によって加熱されて軟化するとともに、上方から押圧される。これにより、一次素子４２から、二次素子（不図示）が成形されるため、仮ベース部４１に複数の二次素子が一体的に形成されたプレファスナー体が作製される。 In the secondary forming process using the heating and pressing device 70, the temporary base portion 41 of the primary formed body 40 is supported from below by the lower pressing roller 72. Further, at least the upper end portion of each primary element 42 of the primary molded body 40 is heated and softened by the upper pressing roller 71 and is pressed from above. As a result, a secondary element (not shown) is molded from the primary element 42, so that a pre-fastener body in which a plurality of secondary elements are integrally formed on the temporary base portion 41 is manufactured.
　この二次成形工程で成形される二次素子は、その図示を省略するものの、仮ベース部４１から立ち上がる略円錐台状の二次ステム部と、二次ステム部の上端部に一体的に形成される係合頭部２２と、係合頭部２２の外周縁部から外側に向けて突出する２つの微小な爪部２３とを有する。 Although not shown, the secondary element formed in this secondary molding step is formed integrally with a substantially truncated conical secondary stem portion rising from the temporary base portion 41 and an upper end portion of the secondary stem portion. The engagement head 22 has two minute claws 23 that protrude outward from the outer peripheral edge of the engagement head 22.
　この場合、各二次素子の二次ステム部は、上下方向に直交する断面が円形又は略円形を呈するとともに、その断面の直径が仮ベース部４１から離れるにつれて徐々に小さくなる形状を有する。また、二次素子を機械方向ＭＤから見たときの二次ステム部の形状と、二次素子を直交方向ＣＤから見たときの二次ステム部の形状とは、互いに同じ又は略同じ形状に形成される。各二次素子に設けられる係合頭部２２及び爪部２３は、図１～図４に示す係合素子２０の係合頭部２２及び爪部２３と実質的に同様の形状及び大きさで形成される。 In this case, the secondary stem portion of each secondary element has a circular or substantially circular cross section perpendicular to the vertical direction, and the diameter of the cross section gradually decreases as it moves away from the temporary base portion 41. Further, the shape of the secondary stem portion when the secondary element is viewed from the machine direction MD and the shape of the secondary stem portion when the secondary element is viewed from the orthogonal direction CD are the same or approximately the same shape. It is formed. The engagement head 22 and claw portion 23 provided on each secondary element have substantially the same shape and size as the engagement head 22 and claw portion 23 of the engagement element 20 shown in FIGS. 1 to 4. It is formed.
　二次成形工程が行われた後、加熱押圧装置７０から送り出されたプレファスナー体は、延伸装置８０に搬送される（図５を参照）。延伸装置８０では、図示しない供給部からプレファスナー体が延伸装置８０内に導入され、プレファスナー体に対し、加熱ローラーによる加熱処理（加熱工程）、加熱ローラーと延伸ローラーとの間で行われる延伸加工（延伸工程）、及び延伸加工後の緩和処理（緩和工程）が順番に施される。 After the secondary forming process is performed, the pre-fastener body sent out from the heating and pressing device 70 is conveyed to the stretching device 80 (see FIG. 5). In the stretching device 80, a pre-fastener body is introduced into the stretching device 80 from a supply section (not shown), and the pre-fastener body is subjected to heat treatment (heating step) with a heating roller and stretching performed between the heating roller and the stretching roller. Processing (stretching process) and relaxation treatment after stretching process (relaxation process) are performed in order.
　延伸装置８０における加熱処理では、プレファスナー体を加熱ローラーのローラー表面に接触させることにより、プレファスナー体を延伸加工可能な温度に加熱する。
　プレファスナー体が加熱ローラーを通過した後、プレファスナー体に対し、加熱ローラーと、加熱ローラーよりも早い回転速度で回転する延伸ローラーとの間で、プレファスナー体を機械方向ＭＤに沿って延伸する延伸加工（一軸延伸加工）が行われる。この延伸加工により、プレファスナー体の仮ベース部４１を機械方向ＭＤに延伸して、面ファスナー１０が備えるベース部１１を形成できる。この延伸加工後に得られるベース部１１の上面及び下面間の厚さは、二次成形工程後の仮ベース部４１の上面及び下面間の厚さよりも薄くされている。 In the heat treatment in the stretching device 80, the pre-fastener body is brought into contact with the roller surface of a heating roller, thereby heating the pre-fastener body to a temperature at which it can be stretched.
After the pre-fastener body passes through the heating roller, the pre-fastener body is stretched along the machine direction MD between the heating roller and a stretching roller that rotates at a faster rotation speed than the heating roller. Stretching processing (uniaxial stretching processing) is performed. By this stretching process, the temporary base portion 41 of the pre-fastener body can be stretched in the machine direction MD to form the base portion 11 of the hook-and-loop fastener 10. The thickness between the upper surface and the lower surface of the base part 11 obtained after this stretching process is made thinner than the thickness between the upper surface and the lower surface of the temporary base part 41 after the secondary molding process.
　更に、本実施形態の延伸加工では、仮ベース部４１を延伸するときに、二次素子における二次ステム部の下端部を、仮ベース部４１とともに機械方向ＭＤに延伸する加工条件で行われる。この場合、延伸加工の加工条件には、例えば、プレファスナー体の加熱温度、加熱ローラーの回転速度、延伸ローラーの回転速度等のうちの少なくとも１つが含まれる。 Furthermore, in the stretching process of this embodiment, when stretching the temporary base part 41, the lower end of the secondary stem part in the secondary element is stretched in the machine direction MD together with the temporary base part 41. In this case, the processing conditions for the stretching process include, for example, at least one of the heating temperature of the pre-fastener body, the rotation speed of the heating roller, the rotation speed of the stretching roller, and the like.
　この延伸加工により二次ステム部の下端部を延伸することによって、略円錐台状の二次ステム部を機械方向ＭＤに延ばして、ベース部１１との連結部が機械方向ＭＤに長い楕円又は略楕円の形状を有するステム部２１に変形させることができる。また、ステム部２１を、上述した第１形状３１と第２形状３２とが互いに異なる形状に形成できる。その結果、二次成形工程で成形された二次素子から、図１～図４に示すような形状を有する係合素子２０が成形される。 By stretching the lower end portion of the secondary stem portion through this stretching process, the approximately truncated conical secondary stem portion is extended in the machine direction MD, and the connecting portion with the base portion 11 is formed into an elliptical shape or approximately elongated in the machine direction MD. The stem portion 21 can be deformed into an elliptical shape. Further, the stem portion 21 can be formed in a shape in which the first shape 31 and the second shape 32 described above are different from each other. As a result, an engaging element 20 having a shape as shown in FIGS. 1 to 4 is molded from the secondary element molded in the secondary molding process.
　更に、この延伸加工では、ベース部１１に、機械方向ＭＤに沿った破断を生じさせ難くすることができる。なお、この破断を生じさせ難くする理由については明らかではないが、その理由の１つとして、本実施形態では、プレファスナー体における二次素子においても、また、製造される面ファスナー１０の係合素子２０においても、二次ステム部又はステム部２１の形成範囲２７が、直交方向ＣＤに隣り合う素子列間で互いに重なり合っていることが考えられる。 Furthermore, this stretching process can make it difficult to cause the base portion 11 to break along the machine direction MD. Although the reason for making this breakage difficult to occur is not clear, one of the reasons for this is that in this embodiment, even in the secondary element of the pre-fastener body, the engagement of the hook-and-loop fastener 10 to be manufactured is In the element 20 as well, it is conceivable that the formation range 27 of the secondary stem portion or the stem portion 21 overlaps each other between adjacent element rows in the orthogonal direction CD.
　例えば、仮ベース部の二次ステム部が設けられていない部分、又はベース部１１のステム部２１が設けられていない部分が、直交方向ＣＤに沿って連続的に形成されるような場合、仮ベース部又はベース部１１の強度が、二次ステム部又はステム部２１が設けられていない部分で局部的に低下し、また、その強度が低下する部分が機械方向ＭＤに一定の周期で仮ベース部又はベース部１１に形成される可能性がある。これに対し、本実施形態のように、二次ステム部又はステム部２１の形成範囲２７が、直交方向ＣＤに隣り合う素子列間で互いに重なり合うことにより、仮ベース部又はベース部１１の強度が局部的に低下することを抑制できる。このため、延伸加工において、ベース部１１に機械方向ＭＤの破断を生じさせ難くすることができると考えられる。 For example, if a portion of the temporary base portion where the secondary stem portion is not provided or a portion of the base portion 11 where the stem portion 21 is not provided is continuously formed along the orthogonal direction CD, The strength of the base part or the base part 11 is locally reduced in the part where the secondary stem part or the stem part 21 is not provided, and the part where the strength is reduced is fixed periodically in the machine direction MD to the temporary base. or the base portion 11. On the other hand, as in the present embodiment, the formation range 27 of the secondary stem portion or stem portion 21 overlaps between adjacent element rows in the orthogonal direction CD, so that the strength of the temporary base portion or the base portion 11 is increased. Local reduction can be suppressed. For this reason, it is thought that it is possible to make it difficult to cause the base portion 11 to break in the machine direction MD during the stretching process.
　以上のような延伸加工を行うことによって、プレファスナー体から、本実施形態の面ファスナー１０を得ることができる。なお、この延伸加工では、プレファスナー体の仮ベース部４１を機械方向ＭＤに沿って延伸して薄くするとともに、略円錐台状の二次ステム部から機械方向ＭＤに長いステム部２１を成形することが可能であれば、延伸加工の方法、手段、及び条件等は特に限定されない。 By performing the stretching process as described above, the hook-and-loop fastener 10 of this embodiment can be obtained from the pre-fastener body. In addition, in this stretching process, the temporary base portion 41 of the pre-fastener body is stretched along the machine direction MD to make it thinner, and a stem portion 21 that is long in the machine direction MD is formed from the approximately truncated conical secondary stem portion. As long as it is possible, the method, means, conditions, etc. of stretching are not particularly limited.
　上述の延伸加工を行った後、ベース部１１及び係合素子２０を有する面ファスナー１０に対して緩和処理を行う。この緩和処理では、面ファスナー１０を、延伸ローラーと、延伸ローラーよりも遅い回転速度で回転する緩和ローラーとの間で、面ファスナー１０に加えられる張力が弱められた状態で搬送する。これにより、面ファスナー１０の形状を安定させることができる。 After performing the above-mentioned stretching process, a relaxation process is performed on the hook-and-loop fastener 10 having the base portion 11 and the engaging element 20. In this relaxation process, the hook-and-loop fastener 10 is conveyed between a stretching roller and a relaxing roller that rotates at a rotation speed slower than the stretching roller, with the tension applied to the hook-and-loop fastener 10 being weakened. Thereby, the shape of the hook-and-loop fastener 10 can be stabilized.
　その後、緩和ローラーを通過した面ファスナー１０は、延伸装置８０の排出部から外側に送り出される。また、延伸装置８０から排出された面ファスナー１０は、例えば回収ローラー等にロール状に巻き取られて回収される。また、面ファスナー１０は、延伸装置８０から図示しない切断部に向けて搬送され、その切断部にて所定の幅寸法及び／又は長さ寸法に切断された後に回収されてもよい。 Thereafter, the hook-and-loop fastener 10 that has passed through the relaxation roller is sent out from the discharge section of the stretching device 80 to the outside. Further, the hook-and-loop fastener 10 discharged from the stretching device 80 is collected by being wound up into a roll shape, for example, by a collection roller or the like. Further, the hook-and-loop fastener 10 may be transported from the stretching device 80 toward a cutting section (not shown), cut into a predetermined width and/or length at the cutting section, and then recovered.
　以上に説明した一次成形工程、二次成形工程、及び延伸工程を含む製造方法を行うことによって、図１～図４に示す本実施形態の面ファスナー１０が製造される。 The hook-and-loop fastener 10 of this embodiment shown in FIGS. 1 to 4 is manufactured by performing the manufacturing method including the primary molding process, secondary molding process, and stretching process described above.
　製造された本実施形態の面ファスナー１０では、各係合素子２０のステム部２１が、図３及び図４に示したように、係合素子２０を機械方向ＭＤから見たときの第１形状３１と、係合素子２０を直交方向ＣＤから見たときの第２形状３２とが互いに異なるような方向性（すなわち、機械方向ＭＤと直交方向ＣＤとの違い）が設けられた構造を有している。 In the produced hook-and-loop fastener 10 of this embodiment, the stem portion 21 of each engaging element 20 has a first shape when the engaging element 20 is viewed from the machine direction MD, as shown in FIGS. 3 and 4. 31 and the second shape 32 when the engaging element 20 is viewed from the orthogonal direction CD have a structure in which the directionality is different from each other (i.e., the difference between the machine direction MD and the orthogonal direction CD). ing.
　特に本実施形態では、ステム部２１のベース部１１に連結する連結部が、機械方向ＭＤに長い楕円又は略楕円の形状に形成されており、また、直交方向ＣＤに隣り合う係合素子列２６間において、機械方向ＭＤにおけるステム部２１の形成範囲２７が互いに重なるように面ファスナー１０が形成されている。これにより、上述したように、ベース部１１が上述した延伸加工によって薄く形成されていても面ファスナー１０のベース部１１に力が加えられたときに（例えば面ファスナー１０の製造工程における延伸加工のときに）、ベース部１１に機械方向ＭＤに沿った破断を生じさせ難くすることができる。 In particular, in this embodiment, the connecting portion of the stem portion 21 connected to the base portion 11 is formed in an elliptical or substantially elliptical shape long in the machine direction MD, and the engaging element rows 26 adjacent to each other in the orthogonal direction CD Between them, the hook-and-loop fastener 10 is formed such that the forming ranges 27 of the stem portions 21 in the machine direction MD overlap with each other. As a result, as described above, even if the base part 11 is thinly formed by the above-mentioned stretching process, when a force is applied to the base part 11 of the hook-and-loop fastener 10 (for example, due to the stretching process in the manufacturing process of the hook-and-loop fastener 10), ), it is possible to make it difficult to cause the base portion 11 to break along the machine direction MD.
　更に本実施形態の面ファスナー１０では、各係合素子２０が機械方向ＭＤと直交方向ＣＤとにおいて互いに異なる構造を有することにより、以下に説明するように、機械方向ＭＤと直交方向ＣＤとにおいて異なる性質を示すことができる。 Furthermore, in the hook-and-loop fastener 10 of this embodiment, each engaging element 20 has a structure that is different from each other in the machine direction MD and the orthogonal direction CD. properties can be shown.
　例えば、ループ部材に対する面ファスナー１０の剥離強度について、面ファスナー１０を機械方向ＭＤに沿って剥離するときの強度をＭＤ剥離強度と規定し、また、面ファスナー１０を直交方向ＣＤに沿って剥離するときの強度をＣＤ剥離強度と規定する。この場合、本実施形態の面ファスナー１０は、方向性が設けられた構造を有することによって、以下に説明するように、ＣＤ剥離強度がＭＤ剥離強度よりも大きくなる性質を備えている。 For example, regarding the peel strength of the hook-and-loop fastener 10 against a loop member, the strength when the hook-and-loop fastener 10 is peeled off along the machine direction MD is defined as the MD peel strength, and the strength when the hook-and-loop fastener 10 is peeled off along the orthogonal direction CD is defined as the MD peel strength. The strength at this time is defined as CD peel strength. In this case, the hook-and-loop fastener 10 of this embodiment has a structure with directionality, so that the CD peel strength is greater than the MD peel strength, as described below.
　ここで、面ファスナー１０のＣＤ剥離強度とＭＤ剥離強度を測定する方法について、図８及び図９を参照しながら説明する。
　面ファスナー１０のＣＤ剥離強度を測定する場合、先ず、面ファスナー１０から、例えば図８に示すように、機械方向ＭＤの寸法が直交方向ＣＤの寸法よりも長くなる細長い切断片９１を切り取って作製する。更に、その切断片９１を支持部材９２に接着することによって、面ファスナー１０側の第１試験片９３を作製する。また、所定の目付で形成されたループ部材を所定の形状及び大きさに切断することにより、第１試験片９３の切断片９１（面ファスナー１０）に係合させる第２試験片９４を作製する。 Here, a method for measuring the CD peel strength and MD peel strength of the hook-and-loop fastener 10 will be described with reference to FIGS. 8 and 9.
When measuring the CD peel strength of the hook and loop fastener 10, first, as shown in FIG. do. Furthermore, by adhering the cut piece 91 to a support member 92, a first test piece 93 on the hook-and-loop fastener 10 side is produced. Further, by cutting a loop member formed with a predetermined basis weight into a predetermined shape and size, a second test piece 94 to be engaged with the cut piece 91 (velcro fastener 10) of the first test piece 93 is produced. .
　次に、第１試験片９３に設けた面ファスナー１０を第２試験片９４に係合させ、更に、第２試験片９４を図９に示すようにＵ字状に折り返す。続いて、第１試験片９３と第２試験片９４とをそれぞれ一対の図示しないクランパーで把持し、その後、第１試験片９３を把持したクランパーと、第２試験片９４を把持したクランパーとを互いに離間する向きに一定の速度で移動させる。これによって、係合状態にある第１試験片９３及び第２試験片９４に対し、図９に矢印で示すような負荷を徐々に加えることができる。そして、負荷を加え始めてからの５０ｍｍ間の平均荷重を積分法にて算出する（ただし、解析は係合部分の３ｍｍの位置から５０ｍｍの９９％までの間で行う）。この算出した値を面ファスナー１０の有効巾（ｃｍ）で除することによって、面ファスナー１０のＣＤ剥離強度（Ｎ／ｃｍ）が測定される。 Next, the hook-and-loop fastener 10 provided on the first test piece 93 is engaged with the second test piece 94, and the second test piece 94 is further folded back into a U-shape as shown in FIG. Subsequently, the first test piece 93 and the second test piece 94 are each held by a pair of clampers (not shown), and then the clamper holding the first test piece 93 and the clamper holding the second test piece 94 are held together. Move them away from each other at a constant speed. As a result, a load as shown by the arrows in FIG. 9 can be gradually applied to the first test piece 93 and the second test piece 94 in the engaged state. Then, the average load for 50 mm from the start of applying the load is calculated by the integral method (however, the analysis is performed from the 3 mm position of the engagement portion to 99% of 50 mm). By dividing this calculated value by the effective width (cm) of the hook-and-loop fastener 10, the CD peel strength (N/cm) of the hook-and-loop fastener 10 is measured.
　一方、面ファスナー１０のＭＤ剥離強度を測定する場合には、面ファスナー１０から、直交方向ＣＤの寸法が機械方向ＭＤの寸法よりも長くなる細長い切断片を切り取って作製する。更に、その面ファスナーの切断片を支持部材に接着することによって、面ファスナー１０側の第１試験片を作製する。その後、ＣＤ剥離強度を測定する場合と同様に第２試験片を作製する。得られた第１試験片と第２試験片とを用いて、ＣＤ剥離強度を測定する場合と同様の測定を行うことにより、面ファスナー１０のＭＤ剥離強度（Ｎ／ｃｍ）が測定される。 On the other hand, when measuring the MD peel strength of the hook-and-loop fastener 10, a long and narrow cut piece whose dimension in the orthogonal direction CD is longer than the dimension in the machine direction MD is cut out from the hook-and-loop fastener 10. Furthermore, a first test piece on the side of the hook-and-loop fastener 10 is produced by adhering the cut piece of the hook-and-loop fastener to a support member. Thereafter, a second test piece is prepared in the same manner as when measuring CD peel strength. Using the obtained first test piece and second test piece, the MD peel strength (N/cm) of the hook-and-loop fastener 10 is measured by performing the same measurement as when measuring the CD peel strength.
　本実施形態の面ファスナー１０では、係合素子２０の爪部２３が直交方向ＣＤに沿って突出しているため、面ファスナー１０を直交方向ＣＤに沿うようにループ部材に係合させるときに、係合素子２０の爪部２３にループ部材のループを引っ掛け易くすることができる。更に、係合素子２０を機械方向ＭＤから見たときのステム部２１の第１形状３１が、係合素子２０を直交方向ＣＤから見たときのステム部２１の第２形状３２よりも細く形成されているため、各係合素子２０が、上述したように、機械方向ＭＤよりも直交方向ＣＤに撓み易く形成されている。このように係合素子２０のステム部２１が直交方向ＣＤに撓み易いことにより、面ファスナー１０を直交方向ＣＤに沿うようにループ部材に係合させるときに、例えば面ファスナー１０を機械方向ＭＤに沿うように係合させる場合に比べて、係合素子２０をループ部材のループ間に、ステム部２１の撓みを利用してより深く入り込ませることができる。このため、各係合素子２０をよりしっかりとループ部材に係合させることが可能となる。 In the hook-and-loop fastener 10 of this embodiment, since the claw portion 23 of the engaging element 20 protrudes along the orthogonal direction CD, when the hook-and-loop fastener 10 is engaged with the loop member along the orthogonal direction CD, The loop of the loop member can be easily hooked onto the claw portion 23 of the coupling element 20. Furthermore, the first shape 31 of the stem portion 21 when the engaging element 20 is viewed from the machine direction MD is formed to be thinner than the second shape 32 of the stem portion 21 when the engaging element 20 is viewed from the orthogonal direction CD. Therefore, each engagement element 20 is formed to be more flexible in the orthogonal direction CD than in the machine direction MD, as described above. Since the stem portion 21 of the engagement element 20 is easily bent in the orthogonal direction CD, when the hook-and-loop fastener 10 is engaged with the loop member along the orthogonal direction CD, for example, the hook-and-loop fastener 10 is moved in the machine direction MD. Compared to the case where the engaging element 20 is engaged along the loop member, the engaging element 20 can be inserted more deeply between the loops of the loop member by utilizing the deflection of the stem portion 21. Therefore, each engaging element 20 can be more securely engaged with the loop member.
　従って、本実施形態の面ファスナー１０は、ＭＤ剥離強度とＣＤ剥離強度とを測定して比べたときに、ＣＤ剥離強度がＭＤ剥離強度よりも高くなる性質を備えている。例えば本実施形態の面ファスナー１０の場合、ＣＤ剥離強度及びＭＤ剥離強度をそれぞれ複数回測定して、その平均値を求めた結果、ＣＤ剥離強度が０．５３Ｎ／ｃｍであり、ＭＤ剥離強度が０．０２Ｎ／ｃｍであった。このため、ＣＤ剥離強度は、ＭＤ剥離強度の１０倍以上の大きさであることが確認された。なお、本実施形態においては、各係合素子２０が機械方向ＭＤと直交方向ＣＤとにおいて異なる構造を有していても、面ファスナー１０の剪断強度には方向性の差が見られなかった。 Therefore, the hook-and-loop fastener 10 of this embodiment has the property that when the MD peel strength and the CD peel strength are measured and compared, the CD peel strength is higher than the MD peel strength. For example, in the case of the hook-and-loop fastener 10 of this embodiment, the CD peel strength and the MD peel strength were each measured multiple times and the average value was calculated. As a result, the CD peel strength was 0.53 N/cm, and the MD peel strength was It was 0.02N/cm. Therefore, it was confirmed that the CD peel strength was 10 times or more greater than the MD peel strength. In this embodiment, even if each engaging element 20 has a different structure in the machine direction MD and the orthogonal direction CD, no difference in directionality was observed in the shear strength of the hook-and-loop fastener 10.
　このようにＭＤ剥離強度よりも高いＣＤ剥離強度を備える本実施形態の面ファスナー１０を、例えば使い捨ておむつに使用する場合には、面ファスナー１０を、ループ部材への係合・剥離が面ファスナー１０の直交方向ＣＤに沿って行われる向き（すなわち図８に示すような向き）で、使い捨ておむつに取り付けることが好ましい。これにより、面ファスナー１０を使い捨ておむつのループ部材に係合させたときに、面ファスナー１０の高いＣＤ剥離強度により、面ファスナー１０とループ部材の係合状態を安定して維持し、面ファスナー１０をループ部材から簡単に剥がれないようにすることができる。その結果、おむつの取付状態を、面ファスナー１０とループ部材との係合によって安定して保持できる。 When the hook-and-loop fastener 10 of this embodiment, which has a CD peel strength higher than the MD peel strength, is used, for example, in a disposable diaper, the hook-and-loop fastener 10 can be easily engaged with and peeled off from the loop member. It is preferable to attach it to the disposable diaper in an orientation along the direction CD orthogonal to (i.e., as shown in FIG. 8). As a result, when the hook-and-loop fastener 10 is engaged with the loop member of a disposable diaper, the engagement state between the hook-and-loop fastener 10 and the loop member is stably maintained due to the high CD peel strength of the hook-and-loop fastener 10, and the hook-and-loop fastener 10 can be prevented from easily peeling off from the loop member. As a result, the attached state of the diaper can be stably maintained by the engagement between the hook-and-loop fastener 10 and the loop member.
　更に、例えば使い捨ておむつの取付状態を直したい場合等では、面ファスナー１０を強く引っ張ってループ部材から剥離し、その後、面ファスナー１０をループ部材の適切な位置に改めて係合させることがある。このような場合に、本実施形態の面ファスナー１０では、係合素子２０が上述のように直交方向ＣＤに撓み易く形成されているため、面ファスナー１０を強い力でめくってループ部材から剥離するときに、ステム部２１の直交方向ＣＤへの撓みを利用することによって、ループ部材のループを係合素子２０から円滑に外し易くすることができる。その結果、剥離時に、ループ部材のループに破壊や損傷を生じさせ難くすることができるため、面ファスナー１０とループ部材との係合・剥離を安定して繰り返すことが可能となる。更に、係合・剥離が繰り返される場合でも、その面ファスナー１０とループ部材との間の係合強度を低下させ難くすることもできる。 Further, for example, when it is desired to correct the attachment condition of a disposable diaper, the hook-and-loop fastener 10 may be pulled strongly to peel it off from the loop member, and then the hook-and-loop fastener 10 may be reengaged at an appropriate position on the loop member. In such a case, in the hook-and-loop fastener 10 of this embodiment, since the engaging element 20 is formed to be easily bent in the orthogonal direction CD as described above, the hook-and-loop fastener 10 is turned over with strong force and peeled off from the loop member. Sometimes, by utilizing the deflection of the stem portion 21 in the orthogonal direction CD, it is possible to make it easier to smoothly remove the loop of the loop member from the engagement element 20. As a result, it is possible to make it difficult to cause destruction or damage to the loops of the loop member during peeling, and thus it is possible to repeat the engagement and peeling of the hook-and-loop fastener 10 and the loop member in a stable manner. Furthermore, even if engagement and separation are repeated, it is possible to make it difficult to reduce the engagement strength between the hook-and-loop fastener 10 and the loop member.
　また、係合素子２０が上述のように直交方向ＣＤに撓み易く形成されていることにより、面ファスナー１０を強く引っ張ってループ部材から剥離させるときに、上述したようにステム部２１の撓みによりループ部材のループを係合素子２０から円滑に外すことができる。そのため、延伸によってベース部１１の直交方向ＣＤにおける引き裂き強度が低下していたとしても、ループ部材に係合している面ファスナー１０に対して、大きな力が加えられたときには、係合素子２０とループ部材の係合が解除されるため、直交方向ＣＤにおけるベース部１１の引き裂きを防ぐことができる。 Further, since the engaging element 20 is formed to be easily bent in the orthogonal direction CD as described above, when the hook-and-loop fastener 10 is strongly pulled and separated from the loop member, the stem portion 21 is bent as described above, causing the loop The loop of the member can be smoothly removed from the engagement element 20. Therefore, even if the tear strength of the base portion 11 in the orthogonal direction CD is reduced due to stretching, when a large force is applied to the hook-and-loop fastener 10 engaged with the loop member, the engaging element 20 Since the engagement of the loop member is released, tearing of the base portion 11 in the orthogonal direction CD can be prevented.
　本実施形態の面ファスナー１０では、各係合素子２０が機械方向ＭＤと直交方向ＣＤとにおいて異なる構造を有することにより、以下に説明するように、面ファスナー１０の直交方向ＣＤに沿った部分を上下方向に湾曲させるときのＣＤ柔軟性が、面ファスナー１０の機械方向ＭＤに沿った部分を上下方向に湾曲させるときのＭＤ柔軟性よりも高くなる性質を備えている。 In the hook-and-loop fastener 10 of this embodiment, each engaging element 20 has a different structure in the machine direction MD and the orthogonal direction CD, so that the portion of the hook-and-loop fastener 10 along the orthogonal direction CD is It has a property that the CD flexibility when curved in the vertical direction is higher than the MD flexibility when the portion of the hook-and-loop fastener 10 along the machine direction MD is curved in the vertical direction.
　ここで、面ファスナー１０のＭＤ柔軟性とＣＤ柔軟性を測定する方法について、図１０及び図１１を参照しながら説明する。
　図１０は、柔軟性試験装置の作動前の状態を示す。図１１は、柔軟性試験装置を作動させて面ファスナー１０を加圧した状態を示す。 Here, a method for measuring the MD flexibility and CD flexibility of the hook-and-loop fastener 10 will be described with reference to FIGS. 10 and 11.
FIG. 10 shows the state of the flexibility testing device before operation. FIG. 11 shows a state in which the flexibility testing device is activated and pressure is applied to the hook-and-loop fastener 10.
　ＭＤ柔軟性を測定する場合、面ファスナー１０を切断して、機械方向ＭＤが直交方向ＣＤよりも長くなる長尺の試験片１０１を作製する。また、ＣＤ柔軟性を測定する場合、面ファスナー１０を切断して、直交方向ＣＤが機械方向ＭＤよりも長くなる長尺の試験片１０１を作製する。 When measuring MD flexibility, the hook-and-loop fastener 10 is cut to produce a long test piece 101 in which the machine direction MD is longer than the orthogonal direction CD. Furthermore, when measuring CD flexibility, the hook-and-loop fastener 10 is cut to produce a long test piece 101 in which the orthogonal direction CD is longer than the machine direction MD.
　得られた試験片１０１を、試験片１０１の長さ方向における中央付近でベース部１１の表裏方向にループ状に丸めるように曲げることによって、試験片１０１にループ部１０２を形成する。このとき、試験片１０１は、面ファスナー１０の係合素子２０がループ部１０２の内周側に配されるように曲げられる。更に、ループ部１０２を形成した試験片１０１の長さ方向の両端部を重ね合わせることによって重なり部１０３を形成する。この場合、例えばループ部１０２の長さが１００ｍｍ、重なり部１０３の長さが２０ｍｍ以上となるように試験片１０１が曲げられる。 A loop portion 102 is formed in the test piece 101 by bending the obtained test piece 101 into a loop shape in the front and back directions of the base portion 11 near the center in the length direction of the test piece 101. At this time, the test piece 101 is bent so that the engaging element 20 of the hook-and-loop fastener 10 is disposed on the inner peripheral side of the loop portion 102 . Furthermore, an overlapping portion 103 is formed by overlapping both lengthwise ends of the test piece 101 with the loop portion 102 formed thereon. In this case, the test piece 101 is bent such that the length of the loop portion 102 is 100 mm or more, and the length of the overlap portion 103 is 20 mm or more, for example.
　柔軟性の試験装置は、上下に移動する移動部材１０４と、移動部材１０４に取り付けられ、試験片１０１のループ部１０２を加圧する加圧子１０６と、試験片１０１の重なり部１０３を固定するクランプ１０７と、クランプ１０７に取り付けられ、荷重を電気信号に変換するロードセル１０５とを有する。 The flexibility testing device includes a moving member 104 that moves up and down, a presser 106 that is attached to the moving member 104 and pressurizes the loop portion 102 of the test piece 101, and a clamp 107 that fixes the overlapped portion 103 of the test piece 101. and a load cell 105 that is attached to the clamp 107 and converts the load into an electrical signal.
　クランプ１０７は、試験片１０１のループ部１０２を加圧子１０６に向けて突出させるようにして試験片１０１の重なり部１０３を挟んで保持することによって、試験片１０１を支持する。この状態で、移動部材１０４を上方へ移動させる。移動部材１０４が上方へ移動すると、加圧子１０６も上方へ移動するため、図１１に示すように、加圧子１０６が試験片１０１のループ部１０２を押圧する。更に、移動部材１０４を所定の位置まで上方へ移動させた後、ロードセル１０５によって移動範囲内での最大荷重を測定する。このような最大荷重の測定を、機械方向ＭＤが長い試験片１０１と、直交方向ＣＤが長い試験片１０１とに対してそれぞれ複数回ずつ行い、その平均値をＭＤ柔軟性及びＣＤ柔軟性として求めた。なお、この平均値が小さいほど、面ファスナー１０は柔軟性に優れている。 The clamp 107 supports the test piece 101 by holding the overlapped part 103 of the test piece 101 in such a way that the loop part 102 of the test piece 101 protrudes toward the presser 106 . In this state, the moving member 104 is moved upward. When the moving member 104 moves upward, the presser 106 also moves upward, so that the presser 106 presses the loop portion 102 of the test piece 101, as shown in FIG. Further, after moving the moving member 104 upward to a predetermined position, the load cell 105 measures the maximum load within the moving range. Such maximum load measurements are performed multiple times each for the test piece 101 that has a long machine direction MD and the test piece 101 that has a long orthogonal direction CD, and the average value is determined as MD flexibility and CD flexibility. Ta. Note that the smaller this average value is, the more excellent the flexibility of the hook-and-loop fastener 10 is.
　本実施形態の面ファスナー１０では、図２に示すように、各係合素子２０の係合頭部２２が直交方向ＣＤに長い楕円又は略楕円の形状に形成されているものの、ステム部２１のベース部１１に連結する連結部は、機械方向ＭＤに長い楕円又は略楕円の形状を有する。また、機械方向ＭＤにおける各係合素子２０のステム部２１の形成範囲２７が、直交方向ＣＤに隣り合う係合素子列２６間で重なり合っている。このため、本実施形態の面ファスナー１０は、ＭＤ柔軟性とＣＤ柔軟性とを測定して比べたときに、ＣＤ柔軟性がＭＤ柔軟性よりも小さい値を示す性質、すなわち、面ファスナー１０の柔軟性が、機械方向ＭＤよりも直交方向ＣＤに優れている性質を備えている。例えば本実施形態の面ファスナー１０の場合、ＣＤ柔軟性及びＭＤ柔軟性を測定した結果、ＭＤ柔軟性が０．０７の値を示し、ＣＤ柔軟性が、ＭＤ柔軟性よりも小さな０．０５の値を示すことが確認された。 In the hook-and-loop fastener 10 of this embodiment, as shown in FIG. The connecting portion connected to the base portion 11 has an elliptical or substantially elliptical shape that is long in the machine direction MD. Further, the formation ranges 27 of the stem portions 21 of each engaging element 20 in the machine direction MD overlap between adjacent engaging element rows 26 in the orthogonal direction CD. For this reason, the hook-and-loop fastener 10 of the present embodiment has a property in which the CD flexibility shows a smaller value than the MD flexibility when the MD flexibility and CD flexibility are measured and compared. It has a property that the flexibility is better in the orthogonal direction CD than in the machine direction MD. For example, in the case of the hook-and-loop fastener 10 of this embodiment, as a result of measuring the CD flexibility and MD flexibility, the MD flexibility showed a value of 0.07, and the CD flexibility was 0.05, which is smaller than the MD flexibility. It was confirmed that the value was shown.
　このようにＣＤ柔軟性がＭＤ柔軟性よりも優れている本実施形態の面ファスナー１０を、例えば使い捨ておむつに使用する場合、面ファスナー１０を、ループ部材に対する係合・剥離が面ファスナー１０の直交方向ＣＤに沿って行われる向きで、使い捨ておむつに取り付けることが好ましい。これにより、面ファスナー１０を使い捨ておむつのループ部材に係合させるとき、また、面ファスナー１０をループ部材から剥離するときに面ファスナー１０がベース部１１の表裏方向（上下方向）に曲げ易くなるため、面ファスナー１０の取り扱い易さを向上させて、使い捨ておむつの取り付け・取り外しをより行い易くすることができる。 When using the hook-and-loop fastener 10 of this embodiment, in which the CD flexibility is superior to the MD flexibility, for example, in a disposable diaper, the hook-and-loop fastener 10 is designed so that the engagement and peeling with respect to the loop member are perpendicular to the hook-and-loop fastener 10. Preferably, it is attached to the disposable diaper in an orientation carried out along the direction CD. Thereby, when the hook-and-loop fastener 10 is engaged with the loop member of the disposable diaper, and when the hook-and-loop fastener 10 is peeled off from the loop member, the hook-and-loop fastener 10 is easily bent in the front and back directions (vertical direction) of the base portion 11. , the ease of handling of the hook-and-loop fastener 10 can be improved, making it easier to attach and detach the disposable diaper.
　更に、延伸によってベース部１１の直交方向ＣＤにおける引き裂き強度が低下していたとしても、ベース部１１に大きな力が加えられたときにはベース部１１が表裏方向（上下方向）に曲げられるため、直交方向ＣＤにおけるベース部１１の引き裂きを防ぐこともできる。また、面ファスナー１０のＭＤ柔軟性の値が大きいため、例えば赤ちゃんを抱きあげたときや洋服を脱がせる際に、洋服と使い捨ておむつが擦れてＭＤ方向に面ファスナー１０が捲れ上がることを防ぐことができる。 Furthermore, even if the tear strength of the base portion 11 in the orthogonal direction CD is reduced due to stretching, when a large force is applied to the base portion 11, the base portion 11 is bent in the front-back direction (vertical direction). It is also possible to prevent the base portion 11 of the CD from being torn. In addition, since the MD flexibility value of the hook-and-loop fastener 10 is large, it is possible to prevent the hook-and-loop fastener 10 from being rolled up in the MD direction due to rubbing between clothes and disposable diapers, for example, when picking up a baby or taking off clothes. can.
　なお、上述した実施形態における二次成形体は、成形装置６０を用いる一次成形工程と、加熱押圧装置７０を用いる二次成形工程とを行うことによって作製されている。しかし本発明において、延伸加工が施される成形体を成形する方法及び手段は特に限定されない。本発明では、例えば、上述した実施形態のような熱変形を生じさせる二次成形工程を行うことなく、ステム部及び係合頭部を備えた係合素子を成形可能なキャビティが設けられた成形装置を用いて成形工程を行うことによって、延伸加工が施される成形体を直接成形してもよい。 Note that the secondary molded body in the embodiment described above is produced by performing a primary molding process using the molding device 60 and a secondary molding process using the heating press device 70. However, in the present invention, there are no particular limitations on the method and means for forming the molded object to be subjected to stretching processing. In the present invention, for example, molding provided with a cavity capable of molding an engagement element having a stem portion and an engagement head without performing a secondary molding process that causes thermal deformation as in the above-described embodiment. The molded body to be stretched may be directly molded by performing the molding process using an apparatus.
　１０　　　　　　　　面ファスナー
　１１　　　　　　　　ベース部
　２０　　　　　　　　係合素子
　２１　　　　　　　　ステム部
　２１ａ　　　　　　　ステム部の外面
　２２　　　　　　　　係合頭部
　２３　　　　　　　　爪部
　２６　　　　　　　　係合素子列
　２７　　　　　　　　形成範囲
　３１　　　　　　　　第１形状
　３２　　　　　　　　第２形状
　４０　　　　　　　　一次成形体
　４１　　　　　　　　仮ベース部
　４２　　　　　　　　一次素子（仮素子）
　４３　　　　　　　　一次ステム部
　４４　　　　　　　　リブ部
　４５　　　　　　　　突出部（一次爪部）
　５０　　　　　　　　製造装置
　６０　　　　　　　　成形装置
　６１　　　　　　　　ダイホイール
　６２　　　　　　　　外側スリーブ（外側円筒体）
　６２ａ　　　　　　　貫通孔
　６２ｂ　　　　　　　孔列
　６２ｃ　　　　　　　貫通孔の形成範囲
　６３　　　　　　　　内側スリーブ（内側円筒体）
　６４　　　　　　　　駆動ローラー
　６５　　　　　　　　供給ノズル
　６６　　　　　　　　ピックアップローラー
　６７　　　　　　　　上側挟持ローラー
　６８　　　　　　　　下側挟持ローラー
　７０　　　　　　　　加熱押圧装置
　７１　　　　　　　　上側押圧ローラー（カレンダローラー）
　７２　　　　　　　　下側押圧ローラー（カレンダローラー）
　８０　　　　　　　　延伸装置
　９１　　　　　　　　切断片
　９２　　　　　　　　支持部材
　９３　　　　　　　　第１試験片
　９４　　　　　　　　第２試験片
１０１　　　　　　　　試験片
１０２　　　　　　　　ループ部
１０３　　　　　　　　重なり部
１０４　　　　　　　　移動部材
１０５　　　　　　　　ロードセル
１０６　　　　　　　　加圧子
１０７　　　　　　　　クランプ
　ＭＤ　　　　　　　　機械方向
　ＣＤ　　　　　　　　直交方向
　Ｄ１　　　　　　　　第１寸法
　Ｄ２　　　　　　　　第２寸法 10 Hook-and-loop fastener 11 Base portion 20 Engagement element 21 Stem portion 21a Outer surface of stem portion 22 Engagement head 23 Claw portion 26 Engagement element row 27 Formation range 31 First shape 32 Second shape 40 Primary molded body 41 Temporary base portion 42 Primary element (temporary element)
43 Primary stem portion 44 Rib portion 45 Projection portion (primary claw portion)
50 Manufacturing equipment 60 Molding equipment 61 Die wheel 62 Outer sleeve (outer cylindrical body)
62a Through hole 62b Hole row 62c Formation range of through hole 63 Inner sleeve (inner cylindrical body)
64 Drive roller 65 Supply nozzle 66 Pick-up roller 67 Upper clamping roller 68 Lower clamping roller 70 Heating pressing device 71 Upper pressing roller (calendar roller)
72 Lower pressure roller (calendar roller)
80 Stretching device 91 Cut piece 92 Support member 93 First test piece 94 Second test piece 101 Test piece 102 Loop part 103 Overlapping part 104 Moving member 105 Load cell 106 Pressure element 107 Clamp MD Machine direction CD Orthogonal direction D1 First dimension D2 Second 2 dimensions

Claims (7)

  1. 　ベース部(11)と、前記ベース部(11)に一体的に形成される複数の係合素子(20)とを有し、各係合素子(20)は、前記ベース部(11)の表面から前記ベース部(11)の厚さ方向に突出するステム部(21)と、前記ステム部(21)の先端部に形成される係合頭部(22)とを有し、前記ステム部(21)の少なくとも上端部における前記厚さ方向に直交する断面は、円形又は円形に近い形状を有し、前記係合頭部(22)は、前記ステム部(21)の先端部から前記厚さ方向に直交する方向の全体に拡がる形状を有する合成樹脂製の面ファスナー(10)であって、
    　前記ステム部(21)の下半部は、前記係合素子(20)を機械方向(MD)から見た第１形状(31)において、前記機械方向(MD)に直交する直交方向(CD)に向く外面(21a)がストレート状又は略ストレート状に形成される部分を含み、且つ、前記係合素子(20)を前記直交方向(CD)から見た第２形状(32)において、前記機械方向(MD)に向く外面(21a)が前記ベース部(11)の表面に向けて湾曲する部分を含む
    ことを特徴とする面ファスナー。     It has a base part (11) and a plurality of engagement elements (20) integrally formed with the base part (11), each engagement element (20) having a surface of the base part (11). The stem portion (21) has a stem portion (21) that protrudes from the base portion (11) in the thickness direction, and an engagement head (22) formed at the distal end portion of the stem portion (21). 21) has a circular or nearly circular cross section at least at the upper end thereof, and the engaging head (22) extends from the tip of the stem portion (21) to the thickness direction. A hook-and-loop fastener (10) made of synthetic resin and having a shape that extends throughout the direction perpendicular to the direction,
    In a first shape (31) when the engaging element (20) is viewed from the machine direction (MD), the lower half of the stem portion (21) is arranged in an orthogonal direction (CD) orthogonal to the machine direction (MD). The outer surface (21a) facing the machine includes a portion formed in a straight or substantially straight shape, and in the second shape (32) when the engaging element (20) is viewed from the orthogonal direction (CD), A hook-and-loop fastener characterized in that an outer surface (21a) facing in the direction (MD) includes a portion that curves toward the surface of the base portion (11).
  2. 　前記ステム部(21)は、前記第２形状(32)において、前記機械方向(MD)に向く前記外面(21a)がストレート状又は略ストレート状に形成される部分を、前記ステム部(21)の上半部に含み、
    　前記第２形状(32)のストレート状又は略ストレート状に形成される部分は、前記第１形状(31)のストレート状又は略ストレート状に形成される部分よりも短い範囲に形成されている
    請求項１記載の面ファスナー。     In the second shape (32), the stem portion (21) has a portion where the outer surface (21a) facing the machine direction (MD) is formed in a straight or substantially straight shape. Included in the upper half of
    A straight or substantially straight portion of the second shape (32) is formed in a shorter range than a straight or substantially straight portion of the first shape (31). The hook-and-loop fastener according to item 1.
  3. 　ベース部(11)と、前記ベース部(11)に一体的に形成される複数の係合素子(20)とを有し、各係合素子(20)は、前記ベース部(11)の表面から前記ベース部(11)の厚さ方向に突出するステム部(21)と、前記ステム部(21)の先端部に形成される係合頭部(22)とを有し、前記ステム部(21)の少なくとも上端部における前記厚さ方向に直交する断面は、円形又は円形に近い形状を有し、前記係合頭部(22)は、前記ステム部(21)の先端部から前記厚さ方向に直交する方向の全体に拡がる形状を有する合成樹脂製の面ファスナー(10)であって、
    　前記係合素子(20)を機械方向(MD)から見たときに、前記ステム部(21)の前記ベース部(11)に連結する連結部における前記機械方向(MD)に直交する直交方向(CD)の長さを第１寸法(D1)とし、前記係合素子(20)を前記直交方向(CD)から見たときに、前記ステム部(21)の前記連結部における前記機械方向(MD)の長さを第２寸法(D2)とした場合、前記ステム部(21)は、前記第２寸法(D2)が前記第１寸法(D1)よりも大きい形状を有し、
    　互いに係合する前記面ファスナー(10)とループ部材とが前記機械方向(MD)及び前記直交方向(CD)に沿って剥離されるときの前記面ファスナー(10)における剥離強度を、それぞれＭＤ剥離強度及びＣＤ剥離強度と規定した場合、前記ステム部(21)は、前記ＣＤ剥離強度が前記ＭＤ剥離強度よりも大きくなる形状を有する
    ことを特徴とする面ファスナー。     It has a base part (11) and a plurality of engagement elements (20) integrally formed with the base part (11), each engagement element (20) having a surface of the base part (11). The stem portion (21) has a stem portion (21) that protrudes from the base portion (11) in the thickness direction, and an engagement head (22) formed at the distal end portion of the stem portion (21). 21) has a circular or nearly circular cross section at least at the upper end thereof, and the engaging head (22) extends from the tip of the stem portion (21) to the thickness direction. A hook-and-loop fastener (10) made of synthetic resin and having a shape that extends throughout the direction perpendicular to the direction,
    When the engaging element (20) is viewed from the machine direction (MD), the connecting portion of the stem portion (21) that connects to the base portion (11) is in the orthogonal direction (MD) orthogonal to the machine direction (MD). CD) is the first dimension (D1), and when the engaging element (20) is viewed from the orthogonal direction (CD), the mechanical direction (MD) at the connecting portion of the stem portion (21) is ) is the second dimension (D2), the stem portion (21) has a shape in which the second dimension (D2) is larger than the first dimension (D1),
    The peel strength of the hook-and-loop fastener (10) when the hook-and-loop fastener (10) and the loop member that engage with each other are peeled off along the machine direction (MD) and the orthogonal direction (CD) is defined as MD peeling strength, respectively. A hook-and-loop fastener characterized in that, when defined as strength and CD peel strength, the stem portion (21) has a shape in which the CD peel strength is greater than the MD peel strength.
  4. 　ベース部(11)と、前記ベース部(11)に一体的に形成される複数の係合素子(20)とを有し、各係合素子(20)は、前記ベース部(11)の表面から前記ベース部(11)の厚さ方向に突出するステム部(21)と、前記ステム部(21)の先端部に形成される係合頭部(22)とを有し、前記ステム部(21)の少なくとも上端部における前記厚さ方向に直交する断面は、円形又は円形に近い形状を有し、前記係合頭部(22)は、前記ステム部(21)の先端部から前記厚さ方向に直交する方向の全体に拡がる形状を有する合成樹脂製の面ファスナー(10)であって、
    　前記面ファスナー(10)の機械方向(MD)に直交する直交方向(CD)に沿った部分を前記厚さ方向に湾曲させるときのＣＤ柔軟性が、前記面ファスナー(10)の前記機械方向(MD)に沿った部分を前記厚さ方向に湾曲させるときのＭＤ柔軟性よりも高い
    ことを特徴とする面ファスナー。     It has a base part (11) and a plurality of engagement elements (20) integrally formed with the base part (11), each engagement element (20) having a surface of the base part (11). The stem portion (21) has a stem portion (21) that protrudes from the base portion (11) in the thickness direction, and an engagement head (22) formed at the distal end portion of the stem portion (21). 21) has a circular or nearly circular cross section at least at the upper end thereof, and the engaging head (22) extends from the tip of the stem portion (21) to the thickness direction. A hook-and-loop fastener (10) made of synthetic resin and having a shape that extends throughout the direction perpendicular to the direction,
    When a portion of the hook-and-loop fastener (10) along the orthogonal direction (CD) perpendicular to the machine direction (MD) is curved in the thickness direction, the CD flexibility is determined by the mechanical direction (CD) of the hook-and-loop fastener (10). A hook-and-loop fastener characterized in that the MD flexibility is higher than the MD flexibility when the portion along the MD) is curved in the thickness direction.
  5. 　複数の前記係合素子(20)は、前記機械方向(MD)に沿って一定のピッチ間隔で一列に配されることにより素子列(26)を形成し、
    　複数の前記素子列(26)は、前記直交方向(CD)に一定の間隔で配置され、
    　各素子列(26)の前記係合素子(20)は、前記直交方向(CD)に隣り合う前記素子列(26)の前記係合素子(20)の位置に対し、前記機械方向(MD)に前記ピッチ間隔の半分の大きさでずらされた位置に配され、
    　前記係合素子(20)は、前記機械方向(MD)に関して、各係合素子(20)の前記ステム部(21)の形成範囲(27)が、前記直交方向(CD)に隣り合う前記素子列(26)における前記係合素子(20)の前記ステム部(21)の形成範囲(27)に対して重なる部分を有する位置に配されている
    請求項１～４の何れかに記載の面ファスナー。     The plurality of engagement elements (20) are arranged in a line at constant pitch intervals along the machine direction (MD) to form an element row (26),
    The plurality of element rows (26) are arranged at regular intervals in the orthogonal direction (CD),
    The engaging elements (20) of each element row (26) are arranged in the machine direction (MD) relative to the position of the engaging element (20) of the element row (26) adjacent in the orthogonal direction (CD). are arranged at positions shifted by half the pitch interval,
    The engagement elements (20) are arranged so that, with respect to the machine direction (MD), the formation range (27) of the stem portion (21) of each engagement element (20) is adjacent to the element in the orthogonal direction (CD). The surface according to any one of claims 1 to 4, wherein the surface of the engaging element (20) in the row (26) has an overlapping portion with the forming range (27) of the stem portion (21). fastener.
  6. 　各係合素子(20)は、前記係合頭部(22)の外周縁部から前記直交方向(CD)に突出する少なくとも１つの爪部(23)を有する
    請求項１～４の何れかに記載の面ファスナー。     Each engaging element (20) has at least one claw portion (23) projecting from the outer peripheral edge of the engaging head (22) in the orthogonal direction (CD). Hook and loop fastener as described.
  7. 　一方向に回転するダイホイール(61)と、前記ダイホイール(61)に向けて溶融した合成樹脂を供給する供給ノズル(65)とを有し、ベース部(11)に複数の係合素子(20)が設けられ、各係合素子(20)が、前記ベース部(11)の表面から前記ベース部(11)の厚さ方向に突出するステム部(21)と、前記ステム部(21)の先端部に形成される係合頭部(22)とを有する面ファスナー(10)の製造に用いられる成形装置(60)において、
    　前記ダイホイール(61)は、少なくとも１つの円筒状のスリーブ(62)と、前記スリーブ(62)を回転させる駆動ローラー(64)とを有し、
    　前記スリーブ(62)は、前記スリーブ(62)の外周面から内周面に貫通する複数の貫通孔(62a)を有し、
    　複数の前記貫通孔(62a)は、機械方向(MD)に沿って一定の孔ピッチ間隔で一列に配されることにより孔列(62b)を形成し、
    　複数の前記孔列(62b)は、前記機械方向(MD)に直交する直交方向(CD)に一定の間隔で配置され、
    　各孔列(62b)の前記貫通孔(62a)は、前記直交方向(CD)に隣り合う前記孔列(62b)の前記貫通孔(62a)の位置に対し、前記機械方向(MD)に前記孔ピッチ間隔の半分の大きさでずらされた位置に配され、
    　前記貫通孔(62a)は、前記機械方向(MD)に関して、各貫通孔(62a)の形成範囲が、前記直交方向(CD)に隣り合う前記孔列(62b)における前記貫通孔(62a)の形成範囲に対して重なる部分を有する位置に配されている
    ことを特徴とする成形装置。     It has a die wheel (61) that rotates in one direction, a supply nozzle (65) that supplies molten synthetic resin toward the die wheel (61), and a plurality of engagement elements ( 20), each engagement element (20) includes a stem portion (21) protruding from the surface of the base portion (11) in the thickness direction of the base portion (11), and the stem portion (21). In a molding device (60) used for manufacturing a hook-and-loop fastener (10) having an engaging head (22) formed at the tip of the
    The die wheel (61) has at least one cylindrical sleeve (62) and a drive roller (64) that rotates the sleeve (62),
    The sleeve (62) has a plurality of through holes (62a) penetrating from the outer peripheral surface to the inner peripheral surface of the sleeve (62),
    The plurality of through holes (62a) are arranged in a line at constant hole pitch intervals along the machine direction (MD) to form a hole row (62b),
    The plurality of hole rows (62b) are arranged at regular intervals in a orthogonal direction (CD) perpendicular to the machine direction (MD),
    The through holes (62a) of each hole row (62b) are arranged in the machine direction (MD) relative to the positions of the through holes (62a) of the hole row (62b) adjacent in the orthogonal direction (CD). They are arranged at positions shifted by half the hole pitch interval,
    With respect to the machine direction (MD), each through hole (62a) has a formation range that is equal to or smaller than that of the through holes (62a) in the hole row (62b) adjacent to each other in the orthogonal direction (CD). A molding device characterized in that the molding device is disposed at a position having an overlapping portion with respect to a forming range.
PCT/JP2023/022659 2022-06-22 2023-06-19 Surface fastener, and molding device WO2023248990A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005508678A (en) * 2001-06-04 2005-04-07 ベルクロ インダストリーズ ビー ヴィッ Fasteners that can be engaged with loops such as non-woven fabric, manufacturing method thereof, and manufacturing machine
WO2020012537A1 (en) * 2018-07-09 2020-01-16 Ykk株式会社 Molded surface fastener

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005508678A (en) * 2001-06-04 2005-04-07 ベルクロ インダストリーズ ビー ヴィッ Fasteners that can be engaged with loops such as non-woven fabric, manufacturing method thereof, and manufacturing machine
WO2020012537A1 (en) * 2018-07-09 2020-01-16 Ykk株式会社 Molded surface fastener

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