WO2023090410A1 - Zipper tape container - Google Patents

Zipper tape container Download PDF

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Publication number
WO2023090410A1
WO2023090410A1 PCT/JP2022/042791 JP2022042791W WO2023090410A1 WO 2023090410 A1 WO2023090410 A1 WO 2023090410A1 JP 2022042791 W JP2022042791 W JP 2022042791W WO 2023090410 A1 WO2023090410 A1 WO 2023090410A1
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WO
WIPO (PCT)
Prior art keywords
zipper tape
base
storage space
container
region
Prior art date
Application number
PCT/JP2022/042791
Other languages
French (fr)
Japanese (ja)
Inventor
誠之 北島
俊一 伊藤
拓人 小川
Original Assignee
出光ユニテック株式会社
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Filing date
Publication date
Application filed by 出光ユニテック株式会社 filed Critical 出光ユニテック株式会社
Publication of WO2023090410A1 publication Critical patent/WO2023090410A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00Details of, or accessories for, sacks or bags
    • B65D33/16End- or aperture-closing arrangements or devices
    • B65D33/25Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package

Definitions

  • the present invention relates to a container with a zipper tape.
  • Patent Literature 1 describes such a bag-like container provided with a steam venting mechanism for preventing excessive expansion and bursting during cooking.
  • the bag-shaped container described in Patent Document 1 is formed with a weakened seal portion whose peripheral edge is weakened and sealed to the bag body so as to close a circular notch provided near the side seal portion of the bag body. It has an extraction mechanism. When the internal pressure rises to a certain extent due to the steam generated during cooking, the steam release mechanism peels off the weakened seal and releases steam from the notch, preventing the bag body from excessively expanding and bursting. .
  • Patent Literature 3 describes a technique for easily forming a vapor outlet capable of stably releasing water vapor by bonding between a film and a portion other than the low bonding strength layer.
  • Patent Literature 3 describes a technique in which such a steam outlet is formed in a section that is eccentrically arranged with respect to the center in the longitudinal direction of the zipper tape.
  • a container body having at least a first surface and a second surface facing each other and having a storage space formed between the first surface and the second surface; and the first surface.
  • a first base disposed between the second surface and defining one side of the storage space and joined to the first surface; a first engaging portion protruding from the first base;
  • zipper tape comprising: a second base joined to the second surface; and a zipper tape including a second engaging portion protruding from the second base and capable of being engaged with the first engaging portion
  • a low bonding strength layer is formed in a portion of the second base facing the second surface so that bonding strength to the container body is lower than that of other portions of the zipper tape.
  • the bonding region between the second base and the second surface is the first base where the second base is bonded to the second surface at a portion other than the low bonding strength layer
  • the shortest distance from the center of the storage space to the first bonding area includes a bonding area and a second bonding area where the second base is bonded to the second surface only by the low bonding strength layer.
  • a container with a zipper tape wherein the distance is equal to or greater than the shortest distance from the center of the storage space to the second joint area.
  • the low bonding strength layer is located at an intermediate portion between the root portion of the second engaging portion of the second base portion and the end portion opposite to the storage space.
  • the first joint region is formed on the side opposite to the storage space with respect to the low joint strength layer, and the second joint region is formed so that the joint region protrudes toward the storage space.
  • first base disposed between the second surface and defining one side of the storage space and joined to the first surface; a first engaging portion protruding from the first base;
  • zipper tape comprising: a second base joined to the second surface; and a zipper tape including a second engaging portion protruding from the second base and capable of being engaged with the first engaging portion A container, wherein the portion of the second base facing the second surface is different from the first resin composition forming the first base and the remainder of the second base
  • the joint region between the second base and the second surface is formed of the second resin composition, and the joint region between the second base and the second surface is the portion where the second base is formed of the first resin composition.
  • the container with a zipper tape according to any one of [1] to [3], wherein the second joint region does not overlap with the longitudinal center of the zipper tape.
  • the second joint region is formed in the first section in the longitudinal direction of the zipper tape, and is the distance Y from the center in the longitudinal direction of the zipper tape to the middle portion in the longitudinal direction of the first section.
  • the zipper tape-attached container according to any one of [1] to [4], wherein the ratio Y/X to the half length X of the opening width of the zipper tape-attached container is 0.15 or more.
  • Any one of [1] to [6], wherein the peel strength between the second base and the second surface in the second bonding region is 30 N/50 mm or less. container with zipper tape.
  • the shortest distance from the center of the storage space to the first joint region is equal to or greater than the shortest distance from the center of the storage space to the second joint region, so that when the contents are heated, the first The vapor pressure over the bond area is less than or equal to the vapor pressure over at least a portion of the second bond area. Therefore, before the second base is pulled with a strong force through the first joint region, the bond in the second joint region is broken to form a steam outlet, and steam can be released stably.
  • FIG. 1 is a plan view of a bag with a zipper tape according to the first embodiment of the present invention
  • FIG. FIG. 2 is a cross-sectional view of the bag with zipper tape shown in FIG. 1 taken along the line II-II.
  • FIG. 2 is a sectional view taken along the line II-II when the contents of the zipper tape-equipped bag shown in FIG. 1 are heated;
  • FIG. 2 is a cross-sectional view of the bag with zipper tape shown in FIG. 1, taken along line III-III.
  • FIG. 4 is a diagram for explaining the arrangement of joint regions according to the first embodiment of the present invention; It is a figure for demonstrating the measuring method of peel strength. It is a figure which shows the example of arrangement
  • FIG. 5 is a plan view of a bag with a zipper tape according to a second embodiment of the present invention
  • FIG. 10 is a cross-sectional view taken along the line XX of the zipper tape-equipped bag shown in FIG. 9
  • FIG. 10 is a cross-sectional view taken along the line XX when the contents of the bag with the zipper tape shown in FIG. 9 are heated
  • FIG. 10 is a sectional view taken along line XI-XI of the zipper tape-equipped bag shown in FIG. 9
  • Fig. 1 is a plan view of a bag with a zipper tape according to the first embodiment of the present invention.
  • 2A, 2B and 3 are sectional views of the bag with zipper tape shown in FIG. 1, taken along line II-II and line III-III.
  • the zipper tape-attached bag 100 includes a bag-like container body formed by a film 110 having a first surface 111A and a second surface 111B facing each other, and a first surface of the film 110. 111A and a zipper tape 120 disposed between the second surface 111B.
  • the zipper tape 120 has at least a portion of its entire length in the width direction joined to the first surface 111A and the second surface 111B, thereby connecting the first surface 111A and the second surface of the film 110 together. 111B and defines one side of the storage space SP in which the content C is stored.
  • the film 110 is formed of, for example, a single layer or multiple layers of thermoplastic resin. More specifically, film 110 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP can be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the film 110 is multi-layered, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used for the face substrate.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • PP polypropylene
  • HPP homopolypropylene
  • RPP random polypropylene
  • BPP block polypropylene
  • OPET biaxially oriented polyethylene terephthalate
  • ONy biaxially oriented nylon
  • the film 110 may also include a layer of inorganic material formed by vapor deposition of aluminum, lamination of aluminum foil, or the like.
  • the two films 110 are bonded together at the bottom seal portion 112 and the side seal portion 113 to form the container body having the first surface 111A and the second surface 111B.
  • the first surface 111A and the second surface 111B may be formed by folding one film 110 at portions corresponding to the side seal portions 113 .
  • the gusset may be formed by film 110 or by another film joined to film 110 .
  • the zipper tape-equipped bag 100 may be a standing pouch that can be placed upright by forming a gusset at the bottom.
  • the shape of the storage space SP formed by the bag 100 with zipper tape is substantially square in the illustrated example, but is not particularly limited.
  • the shape of the storage space SP may be vertically long (the dimension in the direction from the opening 101 toward the bottom seal portion 112 is long) or horizontally long (between the two side seal portions 113, that is, the length of the zipper tape 120). The dimension in the direction is longer), and it is preferably horizontally long.
  • the bottom seal portion 112 and the side seal portions 113 are formed, but the top seal portion is not formed so that the opening 101 of the bag 100 with zipper tape is formed.
  • a top seal portion is formed in addition to the bottom seal portion 112 and the side seal portions 113, and the opening 101 is formed in the zipper tape-equipped bag 100 afterwards by cutting between the top seal portion and the zipper tape 120.
  • the bag with the zipper tape may be provided without the bottom seal portion 112 formed, that is, the storage space SP is not sealed on the side opposite to the zipper tape 120 .
  • the bottom seal portion 112 is formed after filling the storage space SP with the contents.
  • the zipper tape 120 has a first base portion 121A joined to the first surface 111A, a second base portion 121B joined to the second surface 111B, and the first base portion 121A and the second base portion 121B joined to each other. It is an elongated member including engaging portions 122A, 123A and engaging portions 122B, 123B projecting from opposing surfaces and engaging with each other in a cross-sectional shape.
  • the zipper tape 120 is made of polyolefin resin, for example. More specifically, zipper tape 120 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP).
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • PP polypropylene
  • PP can be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP).
  • Polyolefin-based resins are not limited to fossil fuel-derived resins, and may be environmentally friendly bioplastics (polyolefin-based resins such as biomass-derived bio-polyethylene or bio-polypropylene). It may be a mixture of plastics.
  • Known additives such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants may be added to the material of the zipper tape 120, if necessary.
  • the engaging portion 122A is male
  • the engaging portion 122B is female
  • the engaging portions 123A and 123B are hook-shaped.
  • the shape of the engaging portion of the zipper tape is not limited to the illustrated example, and various known shapes of the engaging portion of the zipper tape, such as claw-like, hook-like, or knob-like, can be employed.
  • two pairs of engaging portions are shown in the illustrated example, the number of engaging portions may be one, or three or more. In the illustrated example, each pair of engaging portions (male, female, and hook-shaped) having different shapes is arranged. or more may be arranged.
  • Engaging portions 122A, 123A and engaging portions 122B, 123B allow zipper tape attached bag 100 to be sealed, opened, and resealed.
  • the low bonding strength layer 124 is formed on a portion of the second base portion 121B facing the second surface 111B on the opening 101 side (opposite side to the storage space SP) with respect to the engaging portions 122B and 123B. is formed.
  • the low bonding strength layer 124 is a layer configured to have a lower bonding strength with the film 110 than other portions of the zipper tape 120 .
  • the other part of the zipper tape 120 is made of polypropylene
  • the low bonding strength layer 124 is made of polyethylene, or a mixture of polyethylene and polypropylene (LLDPE, a mixture of LDPE and high density polyethylene (HDPE), Or a mixture of LDPE and polypropylene is exemplified), so that the bonding strength of the low bonding strength layer 124 with the film 110 is lower than the bonding strength between the other part of the zipper tape 120 and the film 110 can be done.
  • the low bonding strength layer 124 is formed with the same thickness as the second base portion 121B, but in other examples, the low bonding strength layer 124 is thinner than the second base portion 121B, and the thickness of the second base portion 121B is less than that of the second base portion 121B. It is preferable that the low bonding strength layer 124 is formed only on the second surface 111B side of the base portion 121B. In that case, a bonding layer is preferably formed between the second base portion 121B and the low bonding strength layer 124 .
  • the bonding layer is composed of, for example, a resin composition as described later.
  • the low bonding strength layer 124 may be laminated on the second surface 111B side of the second base 121B formed with the same thickness as the other portions.
  • the zipper tape 120 including the low bonding strength layer 124 is manufactured, for example, by co-extrusion molding the resin material forming the low bonding strength layer 124 and the resin material forming the other portion.
  • the low bonding strength layer 124 is formed by extruding a portion including the second base 121B, and then applying the material resin of the low bonding strength layer 124 to a predetermined region on the second surface 111B side of the second base 121B.
  • the low bonding strength layer 124 is positioned closer to the opening 101 than the engaging portion, but the low bonding strength layer 124 extends to the opposite side of the opening 101, that is, to the storage space SP side. good too.
  • the resin composition forming the low bonding strength layer 124 is different from the resin composition forming the second base portion 121B.
  • the bonding strength between the low bonding strength layer 124 and the second surface 111B is reduced to that between the other portion of the second base 121B and the second surface 111B. It can be lower than the bonding strength.
  • the resin composition forming the second base portion 121B (simply referred to as the base portion) is polypropylene, and the resin composition forming the low bonding strength layer 124 is polyethylene.
  • a bonding layer is formed between the second base portion 121B and the low bonding strength layer 124 as described above.
  • the bonding strength between the low bonding strength layer 124 and the second surface 111B can be reduced to that of the other portions of the second base 121B and the second surface 111B. It may be lower than the bonding strength between the second surface 111B.
  • Tm means melting point.
  • the first base portion 121A is joined to the first surface 111A over the entire length of the zipper tape 120. Since the low bonding strength layer is not formed on the first base portion 121A, the region where the first base portion 121A is bonded to the first surface 111A is arbitrary.
  • the second base portion 121B is also joined to the second surface 111B over the entire length of the zipper tape 120. As shown in FIG. 1, the second base portion 121B and the second surface 111B are heat sealed or ultrasonically sealed.
  • the bonding area 140 to be bonded by sealing includes a first bonding area 141 and a second bonding area 142 . In the first bonding region 141, as shown in FIG.
  • the second base portion 121B is bonded to the second surface 111B at portions other than the low bonding strength layer 124 (even if the low bonding strength layer 124 is also bonded). good).
  • the second bonding region 142 the second base portion 121B is bonded to the second surface 111B only with the low bonding strength layer 124 as shown in FIG. 2A. That is, in the second bonding region 142, the bonding region between the low bonding strength layer 124 and the second surface 111B faces both the storage space SP side and the opening 101 side (opposite side to the storage space SP). are doing.
  • the low bonding strength layer 124 is formed between the root portion of the engaging portion 122B of the second base portion 121B and the end portion on the opening 101 side (opposite side to the storage space SP). Since it is formed in the intermediate portion between the low bonding strength layers 124 , there is a region that is not the low bonding strength layer 124 on the opening 101 side of the low bonding strength layer 124 . As shown in FIG. 1 , the first bonding region 141 of the bonding regions 140 is formed on the storage space SP side with respect to the low bonding strength layer 124 , and the second bonding region 142 is formed between the bonding region 140 and the opening 101 . is formed by projecting to the opposite side, that is, to the storage space SP side.
  • the second base 121B is attached to the second surface 111B of the film 110 by a first bond area 141 and a second bond area 142 as shown in FIGS. 2A, 2B and 3 . It is installed with one side removed. Specifically, the second base portion 121B is only on the opposite side of the storage space SP from the positions of the engagement portions 122B and 123B in the width direction, and the film is bonded by the first bonding region 141 and the second bonding region 142. It is joined to the second surface 111B of 110 . With such a configuration, when the vapor pressure in the storage space SP increases during heating of the contents, as indicated by the arrows in FIG. A force in the shear direction acts along the width direction of the base of the .
  • the force in this direction causes one claw of the female engaging portion 122B and the male engaging portion 122A to be more strongly engaged, and the hooked engaging portions 123A and 123B to be more strongly engaged with each other. Therefore, it becomes difficult for the shape of the engaging portion to be released by the action of the steam pressure. In addition, this makes it easier for the vapor pressure in the storage space SP to act not only on the engaging portion but also on the second base portion 121B and the second surface 111B in a distributed manner.
  • FIG. 4 is a diagram for explaining the arrangement of joint regions in the first embodiment of the present invention.
  • the shortest distance d1 from the center SP_C of the storage space SP to the first joint region 141 is greater than or equal to the shortest distance d2 from the center SP_C of the storage space SP to the second joint region 142.
  • the center SP_C of the storage space SP can be specified, for example, as the intersection of diagonal lines in the planar shape of the substantially rectangular storage space SP as illustrated.
  • a center SP_C can be identified by drawing a diagonal line as described above from the intersection of these joint areas facing the storage space SP.
  • the joint region between the first base portion 121A of the zipper tape 120 and the first surface 111A of the film 110 is formed in any shape. is defined in relation to the placement of the bonding region 140 on the base 121B side of the base 121B side, specifically the first bonding region 141 and the second bonding region.
  • the center SP_C is set with reference to the junction region 140 of . Further, for example, it is possible to form a folded portion of the film 110 instead of the side seal portion 113. In that case, a diagonal line is drawn from the intersection of the folded portion, the bottom seal portion 112 and the bonding region 140, and the center SP_C can be identified.
  • the center SP_C of the planar shape of the outer edge of the storage space SP that does not include the folded portion is set.
  • the vapor pressure in the storage space SP during heating of the contents is highest at the center SP_C of the storage space SP, and decreases with increasing distance from the center SP_C.
  • the isobar SC indicating the vapor pressure in the storage space SP can be assumed to be a circle centered at the center SP_C of the storage space SP.
  • FIG. 4 shows a constant pressure line SC centered at the center SP_C and having a radius d1. Since the radius d1 is also the shortest distance from the center SP_C to the first bonding area 141 as described above, the vapor pressure applied to the first bonding area 141 when the contents are heated in the illustrated example corresponds to the isobar SC vapor pressure below
  • the shortest distance d2 from the center SP_C of the storage space SP to the second joint region 142 is equal to or less than the shortest distance d1 to the first joint region 141
  • at least a part of the second joint region 142 is illustrated. is inside or on the isobar SC with the radius d1.
  • the isobar SC is the circumference of a circle centered at the center SP_C and in contact with the first joint region 141 . Therefore, the vapor pressure applied to at least a portion of the second joint region 142 during heating of the contents is equal to or higher than the vapor pressure corresponding to the isobar SC.
  • the first bonding region 141 is a portion where the second base portion 121B is bonded to the second surface 111B at a portion other than the low bonding strength layer 124, it will not be destroyed even if the steam pressure increases.
  • the second base portion 121B is pulled with a strong force through the first joint region 141, thereby disengaging the engaging portions 122A and 122B and the engaging portions 123A and 123B, and the second joint region 142 is destroyed.
  • the zipper tape 120 may open before the steam outlet is formed.
  • the steam pressure applied to the first bonding region 141 during heating of the contents is reduced to the vapor pressure applied to at least a part of the second bonding region 142. below pressure. Therefore, before the second base portion 121B is pulled with a strong force through the first joint region 141, the second joint region 142 is destroyed to form a steam outlet, and the unintended opening of the zipper tape 120 by steam pressure is prevented. can be prevented.
  • the peel strength is preferably 30 N/50 mm or less, more preferably 20 N/50 mm or less, even more preferably 15 N/50 mm or less, and particularly preferably 10 N/50 mm or less.
  • the lower limit of the peel strength is not particularly limited, it is, for example, 1 N/50 mm.
  • the components of the resin composition forming the low bonding strength layer 124 and the sealing temperature when forming the bonding region 140 may be adjusted.
  • the peel strength as described above, the second bonding area 142 is destroyed at a lower steam pressure to form a steam outlet, thereby more reliably preventing unintended opening of the zipper tape 120 due to steam pressure. can be done.
  • the peel strength was measured by cutting the zipper tape 120 and the film 110 into 50 mm widths, leaving them at 23° C. and 50% humidity for about 24 hours, and testing them at 23° C. and 50% humidity as shown in FIG. is pulled at a tensile speed of 300 mm/min in the opposite direction forming an angle of about 180° along the width direction of the base 121B of the second base 121B, and the second bonding region 142 is destroyed to break the second base 121B and the second surface 111B. It can be calculated by measuring the maximum strength of the stress when the gap separates.
  • the tensile force can be measured using, for example, a digital force gauge manufactured by Imada Co., Ltd., but is not limited to this example.
  • FIG. 6 is a diagram showing an arrangement example of steam outlets in the first embodiment of the present invention.
  • the first longitudinal section S1 of the zipper tape 120 in which the second joint region 142 is formed may be arranged eccentrically with respect to the longitudinal center 120C.
  • the ratio of eccentricity is represented by the ratio Y/X of the distance Y from the longitudinal center 120C to the longitudinal middle part of the first section S1 to the half length X of the opening width of the bag 100 with zipper tape.
  • the width of the opening is the total length of the zipper tape 120 excluding the portion sealed by the side seal portion 113 .
  • Y/X is preferably 0.15 or more, more preferably 0.20 or more, still more preferably 0.40 or more, even more preferably 0.60 or more, and particularly preferably 0.80 or more.
  • the upper limit is not particularly limited and is less than 1.
  • a plurality of sections among the sections in which the steam outlet is formed are eccentric like the above-described first section S1 , from the longitudinal middle portion of each section to the longitudinal center 120C of the zipper tape 120 With the maximum distance Y as the distance Y, the above condition regarding Y/X should be satisfied.
  • the length W of the first section S1 in the longitudinal direction of the zipper tape 120 (approximately equal to the width of the formed steam outlet) is half the opening width of the zipper tape-attached bag 100.
  • the ratio W/X to X is preferably 0.04 or more, more preferably 0.05 or more, still more preferably 0.10 or more, and particularly preferably 0.15 or more.
  • the upper limit is not particularly limited, and is appropriately adjusted depending on the characteristics of the food used, and is, for example, 0.6. This is because if the width of the steam outlet is too narrow, the amount of deformation at the central portion in the longitudinal direction of the zipper tape 120 increases. If a plurality of sections among the sections in which the steam outlet is formed are eccentric like the first section S1 , the length W of any one section satisfies the above condition regarding W/X. should be filled.
  • FIG. 7 is a diagram showing a modification of the arrangement of joint regions in the first embodiment of the present invention.
  • a plurality of second joint regions 142A, 142B are provided in the longitudinal direction of the zipper tape 120.
  • the shortest distance from the center of the storage space SP to each of the second joint regions 142A and 142B is less than or equal to the shortest distance from the center of the storage space SP to the first joint region 141.
  • a rise in pressure is suppressed, and unintended opening of the zipper tape 120 due to steam pressure can be more reliably prevented.
  • two second bonding regions 142A and 142B are provided in the illustrated example, three or more second bonding regions may be provided.
  • the second joint regions 142A and 142B are provided at the center of the zipper tape 120 in the longitudinal direction without overlapping, but one of them overlaps the center of the zipper tape 120 in the longitudinal direction.
  • a second bonding area may be provided at the bottom.
  • FIG. 8 is a diagram showing a modification of the shape of the joint region in the first embodiment of the present invention.
  • the second joining area 142 has an asymmetrical shape with respect to the longitudinal direction of the zipper tape 120 . More specifically, the second joint region 142 has a shape in which the end edge on the side of the storage space SP is extended toward the longitudinal center of the zipper tape 120 . For example, when the position of the steam outlet is determined, the shape of the second joint region 142 may be extended along a line connecting the steam outlet and the center SP_C of the storage space SP.
  • the shape of the end of the extended second joint region 142 on the side of the storage space SP By making the shape of the end of the extended second joint region 142 on the side of the storage space SP into an acute angle, stress is concentrated when the steam pressure rises, and the second joint region 142 is expanded. It can be easily peeled off.
  • the tip of the second joint region 142 on the side of the storage space SP obtuse or rounded, the second joint can be formed from the center SP_C of the storage space SP due to positional deviation during formation of the joint region. It is possible to prevent the shortest distance d2 to the area 142 from fluctuating significantly.
  • the shape of the end of the second joint region 142 on the storage space SP side in this modified example is determined, for example, in consideration of the above factors.
  • the second joint region 142 By forming the second joint region 142 in the above-described shape, for example, even when the steam outlet is formed at a position away from the longitudinal center of the zipper tape 120, the second joint region 142 on the side of the storage space SP The edge can be brought closer to the center of the storage space SP, and the distance d2 can be less than or equal to the distance d1. As a result, when the content is heated, peeling starts from the end edge of the second joint region 142 on the side of the storage space SP before the vapor pressure applied to the first joint region 141 rises, forming a vapor outlet. It is possible to prevent the zipper tape 120 from being opened.
  • FIG. 9 is a plan view of a bag with zipper tape according to a second embodiment of the present invention.
  • 10A, 10B and 11 are cross-sectional views of the bag shown in FIG. 9 taken along line XX and line XI-XI.
  • the configuration of the zipper tape-equipped bag according to the present embodiment will be described below with reference to these drawings.
  • the zipper tape-attached bag 200 includes a bag-like container body formed by a film 110 having a first surface 111A and a second surface 111B facing each other, and a first surface of the film 110. and a zipper tape 220 disposed between 111A and second surface 111B.
  • the zipper tape 220 has at least a portion of its entire length in the width direction joined to the first surface 111A and the second surface 111B, thereby connecting the first surface 111A and the second surface of the film 110 together. It defines one side of the storage space SP formed between 111B. Note that the configuration of the film 110 is the same as that of the first embodiment described above, and redundant description will be omitted.
  • Zipper tape 220 includes first base 221A joined to first surface 111A, second base 221B joined to second surface 111B, and first base 221A and second base 221B joined to each other. It is an elongated member including, in a cross-sectional shape, an engaging portion 222A and an engaging portion 222B that protrude from opposing surfaces and are capable of engaging with each other.
  • the zipper tape 220 is formed, for example, by extrusion molding of polyolefin resin. More specifically, zipper tape 220 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP can be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP).
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • PP polypropylene
  • HPP homopolypropylene
  • RPP random polypropylene
  • BPP block polypropylene
  • Polyolefin-based resins are not limited to fossil fuel-derived resins, and may be environmentally friendly bioplastics (polyolefin-based resins such as biomass-derived bio-polyethylene or bio-polypropylene). It may be a mixture of plastics. Known additives such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants may be added to the material of the zipper tape 220, if necessary.
  • the engaging portions 222A and the engaging portions 222B are not limited to the shapes shown in the drawings, and various known shapes of the engaging portions of zipper tapes, such as claw-shaped, hook-shaped, or knob-shaped, are combined. It is possible to In addition, although one pair of engaging portion 222A and engaging portion 222B is arranged in the illustrated example, a plurality of pairs of engaging portion 222A and engaging portion 222B may be arranged. Engaging portion 222A and engaging portion 222B allow zipper tape bag 200 to be sealed, opened, and resealed.
  • the cross-sectional shape of the zipper tape 220 includes a first portion 225 made of the first resin composition and a second portion 226 made of the second resin composition.
  • the first portion 225 is made of a first resin composition
  • the second portion 226 is made of a second resin composition. More specifically, second portion 226 forms a portion of second base 221B (shown as surface 221B1) that faces second surface 111B.
  • the first portion 225 includes all of the first base portion 221A, the engaging portion 222A, and the engaging portion 222B, and a second surface (illustrated as surface 221B2) that faces the second surface 111B. It forms the rest of the base 221B.
  • the second resin composition forming the second portion 226 is a resin composition different from the first resin composition forming the first portion 225 .
  • the bonding strength between the first portion 225 and the second portion 226 during heating of the contents is increased between the first portion 225 and the second surface 111B and the second surface 111B. It is lower than the bonding strength between each of the first surfaces 111A and between the second portion 226 and the second surface 111B.
  • the first resin composition is polypropylene and the second resin composition is polyethylene.
  • a third resin composition may be used to form a third portion (not shown) between the second surface 111B and the second portion 226, or a third portion (not shown) may be formed between the second surface 111B and the second portion 226.
  • the bonding strength between the second portion 226 and the second surface 111B is increased by interposing an adhesive between the first portion 225 and the second surface 111B, and the first portion 225 and the second portion 226 can be relatively lower than the bond strength between the second portion 226 and the second surface 111B.
  • the bonding strength between the first portion 225 and the second portion 226 during heating of the contents can be adjusted to the first portion 225 and each of the second surface 111B and the first surface 111A and between the second portion 226 and the second surface 111B.
  • Tm means melting point.
  • the first base portion 221A is joined to the first surface 111A over the entire length of the zipper tape 220. Since the first base portion 221A is the first portion 225 entirely formed of the first resin composition, the region where the first base portion 221A is joined to the first surface 111A is arbitrary.
  • the second base portion 221B is also joined to the second surface 111B over the entire length of the zipper tape 220, but there is a joint region 240 where the second base portion 221B and the second surface 111B are joined by heat sealing or ultrasonic sealing. includes a first junction area 241 and a second junction area 242 . In the first bonding region 241, as shown in FIG.
  • the first portion 225 (surface 221B2) is bonded to the second surface 111B (the second portion 226 may also be bonded).
  • the second bonding region 242 as shown in FIG. 10A, the second base 221B is bonded to the second surface 111B only at the second portion 226 (surface 221B1). That is, in the second joint region 142, the joint region between the second portion 226 (surface 221B1) and the second surface 111B is located on both the storage space SP side and the opening 101 side (the side opposite to the storage space SP). facing the space.
  • the second portion 226 is formed between the root portion of the engaging portion 222B of the second base portion 221B and the end portion on the opening 101 side (opposite side to the storage space SP).
  • the first portion 225 exists closer to the opening 101 than the second portion 226 because it is formed in the intermediate portion between them.
  • the first joint region 241 of the joint region 240 is formed in the first portion 225 located on the storage space SP side with respect to the second portion 226, and the second joint region 242 is formed by projecting the joint region 240 to the side opposite to the opening 101, that is, to the side of the storage space SP.
  • the second base 221B is attached to the second surface 111B of the film 110 by a first bond area 241 and a second bond area 242 as shown in FIGS. 10A, 10B and 11 . It is installed with one side removed. Specifically, the second base portion 221B is attached to the film 110 by the first bonding region 241 and the second bonding region 242 only on the opposite side of the housing space SP from the position of the engaging portion 222B in the width direction. It is joined to the second surface 111B. With such a configuration, when the vapor pressure in the storage space SP increases during heating of the contents, as indicated by the arrows in FIG. A force in the shear direction acts along the width direction of the base of the .
  • the shape of the engaging portion is less likely to be released by the action of steam pressure.
  • this makes it easier for the vapor pressure in the storage space SP to act not only on the engaging portion but also on the second base portion 221B and the second surface 211B in a distributed manner.
  • the shortest distance from the center of the storage space SP to the first joint region 241 is the second joint region from the center of the storage space SP. 242 or greater.
  • the center of the storage space SP is defined in the same manner as described for the first embodiment above.
  • the peel strength between the first portion 225 and the second portion 226 is preferably 20 N/50 mm or less, more preferably 15 N/50 mm or less, and even more preferably 10 N/50 mm or less.
  • the lower limit of peel strength is not particularly limited, it is, for example, 1 N/50 mm.
  • the components of the resin composition forming the first portion 225 and the second portion 226 may be adjusted so that the peel strength falls within the above range.
  • a lower steam pressure breaks the bond between the first portion 225 and the second portion 226 to form a steam outlet, resulting in unintended zipper tape peeling due to steam pressure. 220 can be more reliably prevented from opening.
  • the modified examples of the arrangement and shape of the joint regions as described with reference to FIGS. 6, 7 and 8 for the first embodiment can also be applied to the second embodiment.

Abstract

Provided is a zipper tape container that comprises: a container body that has a storage space formed between a first surface and a second surface that are opposite each other; and a zipper tape that includes a first base part that is joined to the first surface, a first engagement part that protrudes from the first base part, a second base part that is joined to the second surface, and a second engagement part that protrudes from the second base part and can engage the first engagement part. A junction region between the second base part and the second surface includes: a first junction region in which a portion of the second base part that is not a low-joining-strength layer is joined to the second surface; and a second junction region in which only the low-joining-strength layer of the second base part is joined to the second surface. The shortest distance to the first junction region from the center of the storage space is equal to or greater than the shortest distance to the second junction region from the center of the storage space.

Description

ジッパーテープ付き容器container with zipper tape
 本発明は、ジッパーテープ付き容器に関する。 The present invention relates to a container with a zipper tape.
 従来、食品などが収納され加熱調理が可能な袋状容器が広く利用されている。特許文献1には、このような袋状容器として、加熱調理時に過度に膨張して破裂することを防止する水蒸気抜き機構を設けた構成が記載されている。特許文献1に記載された袋状容器は、袋本体のサイドシール部の近傍に円形に設けられた切り欠きを塞ぐように、周縁が袋本体に弱化シールされた弱化シール部が形成された水蒸気抜き機構を有する。この水蒸気抜き機構は、加熱調理時に発生する水蒸気によって内圧がある程度高まると、弱化シール部が剥がれ、切り欠きから水蒸気が放出されることで、袋本体が過度に膨張して破裂することを防止する。  Conventionally, bag-shaped containers that can be used to store food and other items and can be cooked have been widely used. Patent Literature 1 describes such a bag-like container provided with a steam venting mechanism for preventing excessive expansion and bursting during cooking. The bag-shaped container described in Patent Document 1 is formed with a weakened seal portion whose peripheral edge is weakened and sealed to the bag body so as to close a circular notch provided near the side seal portion of the bag body. It has an extraction mechanism. When the internal pressure rises to a certain extent due to the steam generated during cooking, the steam release mechanism peels off the weakened seal and releases steam from the notch, preventing the bag body from excessively expanding and bursting. .
 しかしながら、特許文献1に記載のように水蒸気抜き機構に弱化シール部を用いる場合、弱化シール部の接合強度によって水蒸気の放出が開始される内圧が変動する。また、弱化シール部の接合強度が均一でなければ、弱化シール部が一部だけ剥がれることによって水蒸気の放出量が少なくなる可能性がある。そこで、特許文献2では、袋本体を構成するフィルムに接合されるジッパーテープの一部に低接合強度層を設け、ジッパーテープの長手方向の一部分では低接合強度層とフィルムとの間を接合し、それ以外の部分では低接合強度層でない部分とフィルムとの間を接合することによって、安定した水蒸気の放出が可能な蒸気出口を容易に形成する技術が記載されている。特許文献3には、このような蒸気出口がジッパーテープの長手方向中心に対して偏心して配置された区間に形成される技術が記載されている。 However, when the weakened seal portion is used for the water vapor venting mechanism as described in Patent Document 1, the internal pressure at which the release of water vapor starts varies depending on the bonding strength of the weakened seal portion. In addition, if the joint strength of the weakened seal portion is not uniform, there is a possibility that the weakened seal portion is partially peeled off, thereby reducing the amount of water vapor released. Therefore, in Patent Document 2, a low bonding strength layer is provided in a part of the zipper tape that is bonded to the film that constitutes the bag body, and the low bonding strength layer and the film are bonded in a part of the zipper tape in the longitudinal direction. , describes a technique for easily forming a vapor outlet capable of stably releasing water vapor by bonding between a film and a portion other than the low bonding strength layer. Patent Literature 3 describes a technique in which such a steam outlet is formed in a section that is eccentrically arranged with respect to the center in the longitudinal direction of the zipper tape.
特開2013-46644号公報JP 2013-46644 A 国際公開第2017/119449号WO2017/119449 特開2021-024602号公報Japanese Patent Application Laid-Open No. 2021-024602
 しかしながら、特許文献2に記載のように加熱調理用の袋状容器にジッパーテープが取り付けられている場合、加熱調理中の容器内の蒸気圧によって、ジッパーテープの異形断面部に大きな力が加わる場合がある。この力によって蒸気出口が形成される前にジッパーテープの嵌合が外れると、加熱調理の終了後に蒸気圧が低下した際にジッパーテープが既に開いていることでユーザーの安心感を損なったりする可能性があった。また、特許文献3では、蒸気出口を偏心させることによってジッパーテープが開くという課題は解決されたが、図12の写真に示すような容器の屈曲によって蒸気が安定的に放出されない可能性があった。 However, when a zipper tape is attached to a bag-shaped container for cooking, as described in Patent Document 2, a large force is applied to the deformed cross-section of the zipper tape due to the steam pressure inside the container during cooking. There is If the zipper tape is disengaged before the steam outlet is formed by this force, the user's sense of security may be compromised by the fact that the zipper tape is already open when the steam pressure drops after cooking is completed. had a nature. Moreover, in Patent Document 3, the problem of opening the zipper tape by eccentrically locating the steam outlet was solved, but there was a possibility that the steam could not be released stably due to the bending of the container as shown in the photograph of FIG. 12 . .
 そこで、本発明は、内容物の加熱時に蒸気出口を形成可能な容器において、安定した蒸気の放出が可能なジッパーテープ付き容器を提供することを目的とする。 Therefore, it is an object of the present invention to provide a container with a zipper tape capable of stably releasing steam in a container capable of forming a steam outlet when the content is heated.
[1]少なくとも互いに対向する第1の面および第2の面を有し、上記第1の面および上記第2の面の間に収納空間が形成される容器本体と、上記第1の面と上記第2の面との間に配置されて上記収納空間の一辺を画定し、上記第1の面に接合される第1の基部、上記第1の基部から突出する第1の係合部、上記第2の面に接合される第2の基部、および上記第2の基部から突出し上記第1の係合部に係合可能な第2の係合部を含むジッパーテープとを備えるジッパーテープ付き容器であって、上記第2の面に面する上記第2の基部の一部に上記容器本体との接合強度が上記ジッパーテープの他の部分よりも低くなるように構成された低接合強度層が形成され、上記第2の基部と上記第2の面との間の接合領域は、上記第2の基部が上記低接合強度層以外の部分で上記第2の面に接合される第1の接合領域と、上記第2の基部が上記低接合強度層のみで上記第2の面に接合される第2の接合領域とを含み、上記収納空間の中心から上記第1の接合領域までの最短距離が、上記収納空間の中心から上記第2の接合領域までの最短距離以上であるジッパーテープ付き容器。[2]上記ジッパーテープの幅方向について、上記低接合強度層は上記第2の基部の上記第2の係合部の根部と上記収納空間とは反対側の端部との間の中間部分に形成され、上記第1の接合領域は、上記低接合強度層に対して上記収納空間とは反対側に形成され、上記第2の接合領域は、上記接合領域が上記収納空間側に張り出すことによって形成される、[1]に記載のジッパーテープ付き容器。
[3]少なくとも互いに対向する第1の面および第2の面を有し、上記第1の面および上記第2の面の間に収納空間が形成される容器本体と、上記第1の面と上記第2の面との間に配置されて上記収納空間の一辺を画定し、上記第1の面に接合される第1の基部、上記第1の基部から突出する第1の係合部、上記第2の面に接合される第2の基部、および上記第2の基部から突出し上記第1の係合部に係合可能な第2の係合部を含むジッパーテープとを備えるジッパーテープ付き容器であって、上記第2の面に面する上記第2の基部の一部が、上記第1の基部および上記第2の基部の残りの部分を形成する第1の樹脂組成物とは異なる第2の樹脂組成物で形成され、上記第2の基部と上記第2の面との間の接合領域は、上記第2の基部が上記第1の樹脂組成物で形成される部分で上記第2の面に接合される第1の接合領域と、上記第2の基部が上記第2の樹脂組成物で形成される部分のみで上記第2の面に接合される第2の接合領域とを含み、上記収納空間の中心から上記第1の接合領域までの最短距離が、上記収納空間の中心から上記第2の接合領域までの最短距離以上であるジッパーテープ付き容器。
[4]上記第2の接合領域は、上記ジッパーテープの長手方向中心に重複しない、[1]から[3]のいずれか1項に記載のジッパーテープ付き容器。
[5]上記第2の接合領域は、上記ジッパーテープの長手方向の第1の区間に形成され、上記ジッパーテープの長手方向中心から上記第1の区間の長手方向の中間部までの距離Yの上記ジッパーテープ付き容器の開口幅の半分の長さXに対する比Y/Xが0.15以上である、[1]から[4]のいずれか1項に記載のジッパーテープ付き容器。
[6]上記ジッパーテープの長手方向について複数の上記第2の接合領域が設けられる、[1]から[5]のいずれか1項に記載のジッパーテープ付き容器。
[7]上記第2の接合領域における上記第2の基部と上記第2の面との間の剥離強度は、30N/50mm以下である、[1]から[6]のいずれか1項に記載のジッパーテープ付き容器。
[8]上記第2の接合領域は、少なくとも一部が、上記収納空間の中心を中心とし、上記第1の接合領域に接する円の円周よりも内側に位置する、[1]から[7]のいずれか1項に記載のジッパーテープ付き容器。
[9]上記第2の接合領域は、上記収納空間側の端縁が上記ジッパーテープの長手方向中心側に向かって引き延ばされた形状を有する、[1]から[8]のいずれか1項に記載のジッパーテープ付き容器。
[10]上記第2の基部は、幅方向における上記第2の係合部の位置よりも上記収納空間とは反対側のみで、上記接合領域によって上記第2の面に接合される、[1]から[9]のいずれか1項に記載のジッパーテープ付き容器。
[11]上記容器本体は、袋状である、[1]から[10]のいずれか1項に記載のジッパーテープ付き容器。
[1] a container body having at least a first surface and a second surface facing each other and having a storage space formed between the first surface and the second surface; and the first surface. a first base disposed between the second surface and defining one side of the storage space and joined to the first surface; a first engaging portion protruding from the first base; With zipper tape, comprising: a second base joined to the second surface; and a zipper tape including a second engaging portion protruding from the second base and capable of being engaged with the first engaging portion A container, wherein a low bonding strength layer is formed in a portion of the second base facing the second surface so that bonding strength to the container body is lower than that of other portions of the zipper tape. is formed, and the bonding region between the second base and the second surface is the first base where the second base is bonded to the second surface at a portion other than the low bonding strength layer The shortest distance from the center of the storage space to the first bonding area includes a bonding area and a second bonding area where the second base is bonded to the second surface only by the low bonding strength layer. A container with a zipper tape, wherein the distance is equal to or greater than the shortest distance from the center of the storage space to the second joint area. [2] In the width direction of the zipper tape, the low bonding strength layer is located at an intermediate portion between the root portion of the second engaging portion of the second base portion and the end portion opposite to the storage space. The first joint region is formed on the side opposite to the storage space with respect to the low joint strength layer, and the second joint region is formed so that the joint region protrudes toward the storage space. The container with a zipper tape according to [1], which is formed by
[3] a container body having at least a first surface and a second surface facing each other and having a storage space formed between the first surface and the second surface; and the first surface. a first base disposed between the second surface and defining one side of the storage space and joined to the first surface; a first engaging portion protruding from the first base; With zipper tape, comprising: a second base joined to the second surface; and a zipper tape including a second engaging portion protruding from the second base and capable of being engaged with the first engaging portion A container, wherein the portion of the second base facing the second surface is different from the first resin composition forming the first base and the remainder of the second base The joint region between the second base and the second surface is formed of the second resin composition, and the joint region between the second base and the second surface is the portion where the second base is formed of the first resin composition. a first bonding region bonded to the second surface, and a second bonding region bonded to the second surface only at a portion where the second base is formed of the second resin composition; wherein the shortest distance from the center of the storage space to the first joint area is equal to or greater than the shortest distance from the center of the storage space to the second joint area.
[4] The container with a zipper tape according to any one of [1] to [3], wherein the second joint region does not overlap with the longitudinal center of the zipper tape.
[5] The second joint region is formed in the first section in the longitudinal direction of the zipper tape, and is the distance Y from the center in the longitudinal direction of the zipper tape to the middle portion in the longitudinal direction of the first section. The zipper tape-attached container according to any one of [1] to [4], wherein the ratio Y/X to the half length X of the opening width of the zipper tape-attached container is 0.15 or more.
[6] The zipper tape-equipped container according to any one of [1] to [5], wherein a plurality of the second joint regions are provided in the longitudinal direction of the zipper tape.
[7] Any one of [1] to [6], wherein the peel strength between the second base and the second surface in the second bonding region is 30 N/50 mm or less. container with zipper tape.
[8] [1] to [7], wherein at least a portion of the second joint region is positioned inside a circumference of a circle centered on the center of the storage space and in contact with the first joint region; ] The container with a zipper tape according to any one of the above items.
[9] Any one of [1] to [8], wherein the second joint region has a shape in which the end edge on the storage space side is extended toward the center in the longitudinal direction of the zipper tape. A container with a zipper tape as described above.
[10] The second base is joined to the second surface by the joining region only on the opposite side of the storage space from the position of the second engaging portion in the width direction, [1 ] The container with a zipper tape according to any one of [9].
[11] The container with a zipper tape according to any one of [1] to [10], wherein the container body is bag-shaped.
 上記の構成によれば、収納空間の中心から第1の接合領域までの最短距離が、収納空間の中心から第2の接合領域までの最短距離以上であるため、内容物の加熱時に第1の接合領域にかかる蒸気圧が第2の接合領域の少なくとも一部にかかる蒸気圧以下になる。従って、第1の接合領域を介して第2の基部が強い力で引っ張られる前に第2の接合領域における接合を破壊させて蒸気出口を形成し、安定的に蒸気を放出することができる。 According to the above configuration, the shortest distance from the center of the storage space to the first joint region is equal to or greater than the shortest distance from the center of the storage space to the second joint region, so that when the contents are heated, the first The vapor pressure over the bond area is less than or equal to the vapor pressure over at least a portion of the second bond area. Therefore, before the second base is pulled with a strong force through the first joint region, the bond in the second joint region is broken to form a steam outlet, and steam can be released stably.
本発明の第1の実施形態に係るジッパーテープ付き袋の平面図である。1 is a plan view of a bag with a zipper tape according to the first embodiment of the present invention; FIG. 図1に示したジッパーテープ付き袋のII-II線断面図である。FIG. 2 is a cross-sectional view of the bag with zipper tape shown in FIG. 1 taken along the line II-II. 図1に示したジッパーテープ付き袋の内容物を加熱したときのII-II線断面図である。FIG. 2 is a sectional view taken along the line II-II when the contents of the zipper tape-equipped bag shown in FIG. 1 are heated; 図1に示したジッパーテープ付き袋のIII-III線断面図である。FIG. 2 is a cross-sectional view of the bag with zipper tape shown in FIG. 1, taken along line III-III. 本発明の第1の実施形態における接合領域の配置について説明するための図である。FIG. 4 is a diagram for explaining the arrangement of joint regions according to the first embodiment of the present invention; 剥離強度の測定方法について説明するための図である。It is a figure for demonstrating the measuring method of peel strength. 本発明の第1の実施形態における蒸気出口の配置例を示す図である。It is a figure which shows the example of arrangement|positioning of the steam outlet in the 1st Embodiment of this invention. 本発明の第1の実施形態における接合領域の配置の変形例を示す図である。It is a figure which shows the modification of arrangement|positioning of the joining area|region in the 1st Embodiment of this invention. 本発明の第1の実施形態における接合領域の形状の変形例を示す図である。It is a figure which shows the modification of the shape of the joining area|region in the 1st Embodiment of this invention. 本発明の第2の実施形態に係るジッパーテープ付き袋の平面図である。FIG. 5 is a plan view of a bag with a zipper tape according to a second embodiment of the present invention; 図9に示したジッパーテープ付き袋のX-X線断面図である。FIG. 10 is a cross-sectional view taken along the line XX of the zipper tape-equipped bag shown in FIG. 9; 図9に示したジッパーテープ付き袋の内容物を加熱したときのX-X線断面図である。FIG. 10 is a cross-sectional view taken along the line XX when the contents of the bag with the zipper tape shown in FIG. 9 are heated; 図9に示したジッパーテープ付き袋のXI-XI線断面図である。FIG. 10 is a sectional view taken along line XI-XI of the zipper tape-equipped bag shown in FIG. 9; 従来の容器の屈曲を示す写真である(容器内に空気を充満させ内圧を高めレンジアップ時と同様の状態を疑似的に再現したもの)。It is a photograph showing the bending of a conventional container (the one that filled the container with air, increased the internal pressure, and simulated the same state as when the range was raised).
 以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複した説明を省略する。 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.
 図1は、本発明の第1の実施形態に係るジッパーテープ付き袋の平面図である。図2A、図2Bおよび図3は、図1に示したジッパーテープ付き袋のII-II線およびIII-III線の断面図である。図示されているように、ジッパーテープ付き袋100は、互いに対向する第1の面111Aおよび第2の面111Bを有するフィルム110によって形成される袋状の容器本体と、フィルム110の第1の面111Aおよび第2の面111Bの間に配置されるジッパーテープ120とを含む。ジッパーテープ120は、後述するように全長にわたって幅方向の少なくとも一部が第1の面111Aおよび第2の面111Bに接合されており、これによってフィルム110の第1の面111Aおよび第2の面111Bの間に形成され内容物Cが収納される収納空間SPの一辺を画定する。 Fig. 1 is a plan view of a bag with a zipper tape according to the first embodiment of the present invention. 2A, 2B and 3 are sectional views of the bag with zipper tape shown in FIG. 1, taken along line II-II and line III-III. As illustrated, the zipper tape-attached bag 100 includes a bag-like container body formed by a film 110 having a first surface 111A and a second surface 111B facing each other, and a first surface of the film 110. 111A and a zipper tape 120 disposed between the second surface 111B. As will be described later, the zipper tape 120 has at least a portion of its entire length in the width direction joined to the first surface 111A and the second surface 111B, thereby connecting the first surface 111A and the second surface of the film 110 together. 111B and defines one side of the storage space SP in which the content C is stored.
 フィルム110は、例えば単層または多層の熱可塑性樹脂で形成される。より具体的には、フィルム110は、低密度ポリエチレン(LDPE)、直鎖状低密度ポリエチレン(LLDPE)、またはポリプロピレン(PP)で形成されてもよい。PPは、ホモポリプロピレン(HPP)、ランダムポリプロピレン(RPP)、またはブロックポリプロピレン(BPP)であってもよい。フィルム110が多層である場合、表基材に二軸延伸ポリプロピレン(OPP)、二軸延伸ポリエチレンテレフタレート(OPET)、または二軸延伸ナイロン(ONy)を用いてもよい。これらは、化石燃料由来の樹脂には限られず、
環境に配慮したバイオプラスチック(バイオマス由来のバイオポリエチレンやバイオポリプロピレンなどのポリオレフィン系樹脂)であってもよいし、化石燃料由来の樹脂とバイオプラスチックの混合物であってもよい。また、フィルム110は、アルミニウム蒸着やアルミニウム箔の積層などによって形成された無機材料の層を含んでもよい。
The film 110 is formed of, for example, a single layer or multiple layers of thermoplastic resin. More specifically, film 110 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP can be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the film 110 is multi-layered, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used for the face substrate. These are not limited to resins derived from fossil fuels,
Environmentally friendly bioplastics (polyolefin resins such as biomass-derived biopolyethylene and biopolypropylene) may be used, or a mixture of fossil fuel-derived resins and bioplastics may be used. The film 110 may also include a layer of inorganic material formed by vapor deposition of aluminum, lamination of aluminum foil, or the like.
 なお、本実施形態では、2枚のフィルム110がボトムシール部112およびサイドシール部113において互いに接合されることによって第1の面111Aおよび第2の面111Bを有する容器本体を形成しているが、別の実施形態では、1枚のフィルム110がサイドシール部113に対応する部分で折り返されることによって第1の面111Aおよび第2の面111Bが形成されてもよい。あるいは、図1の例におけるボトムシール部112またはサイドシール部113に対応する部分でフィルムが内側に折り込まれた部分、いわゆるガセットが形成されてもよい。この場合、ガセットは、フィルム110によって形成されてもよいし、フィルム110に接合された別のフィルムによって形成されてもよい。また、ジッパーテープ付き袋100は、底部にガセットが形成されることによって立てて置くことが可能なスタンディングパウチであってもよい。また、ジッパーテープ付き袋100によって形成される収納空間SPの形状は、図示された例では略正方形であるが特に限定されない。例えば、収納空間SPの形状は、縦長(開口101からボトムシール部112に向かう方向の寸法が長い)であってもよいし、横長(両方のサイドシール部113の間、つまりジッパーテープ120の長手方向の寸法が長い)であってもよく、横長である方が好ましい。 In this embodiment, the two films 110 are bonded together at the bottom seal portion 112 and the side seal portion 113 to form the container body having the first surface 111A and the second surface 111B. In another embodiment, the first surface 111A and the second surface 111B may be formed by folding one film 110 at portions corresponding to the side seal portions 113 . Alternatively, the portion corresponding to the bottom seal portion 112 or the side seal portion 113 in the example of FIG. In this case, the gusset may be formed by film 110 or by another film joined to film 110 . Alternatively, the zipper tape-equipped bag 100 may be a standing pouch that can be placed upright by forming a gusset at the bottom. Also, the shape of the storage space SP formed by the bag 100 with zipper tape is substantially square in the illustrated example, but is not particularly limited. For example, the shape of the storage space SP may be vertically long (the dimension in the direction from the opening 101 toward the bottom seal portion 112 is long) or horizontally long (between the two side seal portions 113, that is, the length of the zipper tape 120). The dimension in the direction is longer), and it is preferably horizontally long.
 また、本実施形態では、ボトムシール部112およびサイドシール部113が形成される一方で、トップシール部が形成されないことによってジッパーテープ付き袋100の開口101が形成されているが、別の実施形態では、ボトムシール部112およびサイドシール部113に加えてトップシール部が形成され、トップシール部とジッパーテープ120との間を切断することによって事後的にジッパーテープ付き袋100に開口101を形成することが可能であってもよい。さらに別の実施形態では、ボトムシール部112が形成されない、すなわち収納空間SPがジッパーテープ120とは反対側で封止されていない状態でジッパーテープ付き袋が提供されてもよい。この場合、ボトムシール部112は収納空間SPに内容物を充填した後で形成される。これ以外にも、公知の各種の構成のジッパーテープ付き袋に本発明を適用することが可能である。 Further, in this embodiment, the bottom seal portion 112 and the side seal portions 113 are formed, but the top seal portion is not formed so that the opening 101 of the bag 100 with zipper tape is formed. , a top seal portion is formed in addition to the bottom seal portion 112 and the side seal portions 113, and the opening 101 is formed in the zipper tape-equipped bag 100 afterwards by cutting between the top seal portion and the zipper tape 120. may be possible. In still another embodiment, the bag with the zipper tape may be provided without the bottom seal portion 112 formed, that is, the storage space SP is not sealed on the side opposite to the zipper tape 120 . In this case, the bottom seal portion 112 is formed after filling the storage space SP with the contents. In addition to this, it is possible to apply the present invention to bags with zipper tapes having various known configurations.
 ジッパーテープ120は、第1の面111Aに接合される第1の基部121Aと、第2の面111Bに接合される第2の基部121Bと、第1の基部121Aおよび第2の基部121Bの互いに対向する面からそれぞれ突出し互いに係合可能な係合部122A,123Aおよび係合部122B,123Bとを断面形状に含む長尺状の部材である。ジッパーテープ120は、例えばポリオレフィン系樹脂で形成される。より具体的には、ジッパーテープ120は、低密度ポリエチレン(LDPE)、直鎖状低密度ポリエチレン(LLDPE)、またはポリプロピレン(PP)で形成されてもよい。PPは、ホモポリプロピレン(HPP)、ランダムポリプロピレン(RPP)、またはブロックポリプロピレン(BPP)であってもよい。ポリオレフィン系樹脂は、化石燃料由来の樹脂には限られず、環境に配慮したバイオプラスチック(バイオマス由来のバイオポリエチレンやバイオポリプロピレンなどのポリオレフィン系樹脂)であってもよいし、化石燃料由来の樹脂とバイオプラスチックの混合物であってもよい。ジッパーテープ120の材料には、必要に応じて、公知の添加剤、例えば安定剤、酸化防止剤、滑剤、帯電防止剤、または着色剤などが添加されてもよい。 The zipper tape 120 has a first base portion 121A joined to the first surface 111A, a second base portion 121B joined to the second surface 111B, and the first base portion 121A and the second base portion 121B joined to each other. It is an elongated member including engaging portions 122A, 123A and engaging portions 122B, 123B projecting from opposing surfaces and engaging with each other in a cross-sectional shape. The zipper tape 120 is made of polyolefin resin, for example. More specifically, zipper tape 120 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP can be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). Polyolefin-based resins are not limited to fossil fuel-derived resins, and may be environmentally friendly bioplastics (polyolefin-based resins such as biomass-derived bio-polyethylene or bio-polypropylene). It may be a mixture of plastics. Known additives such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants may be added to the material of the zipper tape 120, if necessary.
 なお、ジッパーテープ120に形成される係合部について、図示された例では係合部122Aが雄型、係合部122Bが雌型、係合部123Aおよび係合部123Bが鉤型であるが、図示された例に限られず、爪状、鉤状、または瘤状などを組み合わせた公知の各種のジッパーテープの係合部の形状を採用することが可能である。また、図示された例では2対の係合部が示されているが、係合部は1対であってもよいし、3対以上であってもよい。また、図示された例では形状の異なる係合部(雄型および雌型ならびに鉤型)が1対ずつ配置されているが、同じ形状の係合部(例えば雄型および雌型)が2対以上配置されてもよい。係合部122A,123Aおよび係合部122B,123Bは、ジッパーテープ付き袋100を封止、開封、および再封止することを可能にする。 Regarding the engaging portions formed on the zipper tape 120, in the illustrated example, the engaging portion 122A is male, the engaging portion 122B is female, and the engaging portions 123A and 123B are hook-shaped. The shape of the engaging portion of the zipper tape is not limited to the illustrated example, and various known shapes of the engaging portion of the zipper tape, such as claw-like, hook-like, or knob-like, can be employed. Also, although two pairs of engaging portions are shown in the illustrated example, the number of engaging portions may be one, or three or more. In the illustrated example, each pair of engaging portions (male, female, and hook-shaped) having different shapes is arranged. or more may be arranged. Engaging portions 122A, 123A and engaging portions 122B, 123B allow zipper tape attached bag 100 to be sealed, opened, and resealed.
 本実施形態では、係合部122B,123Bに対して開口101側(収納空間SPとは反対側)で、第2の面111Bに面する第2の基部121Bの一部に低接合強度層124が形成される。低接合強度層124は、ジッパーテープ120の他の部分よりもフィルム110との接合強度が低くなるように構成された層である。具体的には、例えば、ジッパーテープ120の他の部分をポリプロピレンで形成し、低接合強度層124をポリエチレン、またはポリエチレンとポリプロピレンとの混合物(LLDPE、LDPEと高密度ポリエチレン(HDPE)との混合物、またはLDPEとポリプロピレンとの混合物が例示される)で形成することによって、低接合強度層124のフィルム110との接合強度をジッパーテープ120の他の部分とフィルム110との接合強度よりも低くすることができる。 In this embodiment, the low bonding strength layer 124 is formed on a portion of the second base portion 121B facing the second surface 111B on the opening 101 side (opposite side to the storage space SP) with respect to the engaging portions 122B and 123B. is formed. The low bonding strength layer 124 is a layer configured to have a lower bonding strength with the film 110 than other portions of the zipper tape 120 . Specifically, for example, the other part of the zipper tape 120 is made of polypropylene, and the low bonding strength layer 124 is made of polyethylene, or a mixture of polyethylene and polypropylene (LLDPE, a mixture of LDPE and high density polyethylene (HDPE), Or a mixture of LDPE and polypropylene is exemplified), so that the bonding strength of the low bonding strength layer 124 with the film 110 is lower than the bonding strength between the other part of the zipper tape 120 and the film 110 can be done.
 なお、図示された例では低接合強度層124が第2の基部121Bと同じ厚さで形成されているが、他の例では低接合強度層124が第2の基部121Bよりも薄く、第2の基部121Bの第2の面111B側だけが低接合強度層124になっていることが好ましい。その場合、第2の基部121Bと低接合強度層124の間に、接合層が形成されることが好ましい。接合層は、例えば後述するような樹脂組成物で構成される。あるいは、他の部分と同じ厚さで形成された第2の基部121Bの第2の面111B側に低接合強度層124が積層されてもよい。低接合強度層124を含むジッパーテープ120は、例えば低接合強度層124を形成する樹脂材料と他の部分を形成する樹脂材料とを共押出成形することによって製造される。あるいは、低接合強度層124は、第2の基部121Bを含む部分を押出成形によって形成した後に、第2の基部121Bの第2の面111B側の所定の領域に低接合強度層124の材料樹脂を塗布することによって形成されてもよい。また、図示された例では低接合強度層124が係合部よりも開口101側に位置しているが、低接合強度層124は開口101とは反対側、つまり収納空間SP側まで延びていてもよい。 In the illustrated example, the low bonding strength layer 124 is formed with the same thickness as the second base portion 121B, but in other examples, the low bonding strength layer 124 is thinner than the second base portion 121B, and the thickness of the second base portion 121B is less than that of the second base portion 121B. It is preferable that the low bonding strength layer 124 is formed only on the second surface 111B side of the base portion 121B. In that case, a bonding layer is preferably formed between the second base portion 121B and the low bonding strength layer 124 . The bonding layer is composed of, for example, a resin composition as described later. Alternatively, the low bonding strength layer 124 may be laminated on the second surface 111B side of the second base 121B formed with the same thickness as the other portions. The zipper tape 120 including the low bonding strength layer 124 is manufactured, for example, by co-extrusion molding the resin material forming the low bonding strength layer 124 and the resin material forming the other portion. Alternatively, the low bonding strength layer 124 is formed by extruding a portion including the second base 121B, and then applying the material resin of the low bonding strength layer 124 to a predetermined region on the second surface 111B side of the second base 121B. may be formed by applying In the illustrated example, the low bonding strength layer 124 is positioned closer to the opening 101 than the engaging portion, but the low bonding strength layer 124 extends to the opposite side of the opening 101, that is, to the storage space SP side. good too.
 上記の低接合強度層124を形成する樹脂組成物は、第2の基部121Bを形成する樹脂組成物とは異なる。例えば、表1に例示するような構成によって、低接合強度層124と第2の面111Bとの間の接合強度を、第2の基部121Bの他の部分と第2の面111Bとの間の接合強度よりも低くすることができる。表1の例において、第2の基部121B(単に基部と記載する)を形成する樹脂組成物はポリプロピレンであり、低接合強度層124を形成する樹脂組成物はポリエチレンである。この例では、上述のように第2の基部121Bと低接合強度層124との間に接合層が形成される。 The resin composition forming the low bonding strength layer 124 is different from the resin composition forming the second base portion 121B. For example, with the configuration illustrated in Table 1, the bonding strength between the low bonding strength layer 124 and the second surface 111B is reduced to that between the other portion of the second base 121B and the second surface 111B. It can be lower than the bonding strength. In the example of Table 1, the resin composition forming the second base portion 121B (simply referred to as the base portion) is polypropylene, and the resin composition forming the low bonding strength layer 124 is polyethylene. In this example, a bonding layer is formed between the second base portion 121B and the low bonding strength layer 124 as described above.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
 あるいは、表2に例示するような樹脂組成物の組み合わせを採用することによって、低接合強度層124と第2の面111Bとの間の接合強度を、第2の基部121Bの他の部分と第2の面111Bとの間の接合強度よりも低くしてもよい。なお、表2においてTmは融点を意味する。 Alternatively, by adopting a combination of resin compositions as exemplified in Table 2, the bonding strength between the low bonding strength layer 124 and the second surface 111B can be reduced to that of the other portions of the second base 121B and the second surface 111B. It may be lower than the bonding strength between the second surface 111B. In Table 2, Tm means melting point.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
 本実施形態において、第1の基部121Aは、ジッパーテープ120の全長で第1の面111Aに接合される。第1の基部121Aには低接合強度層が形成されないため、第1の基部121Aを第1の面111Aに接合する領域は任意である。一方、第2の基部121Bもジッパーテープ120の全長で第2の面111Bに接合されるが、図1に示すように、第2の基部121Bと第2の面111Bとをヒートシールまたは超音波シールによって接合する接合領域140は、第1の接合領域141と第2の接合領域142とを含む。第1の接合領域141では、図3に示すように第2の基部121Bが低接合強度層124以外の部分で第2の面111Bに接合される(低接合強度層124でも接合されていてもよい)。一方、第2の接合領域142では、図2Aに示すように第2の基部121Bが低接合強度層124のみで第2の面111Bに接合される。つまり、第2の接合領域142では、低接合強度層124と第2の面111Bとの接合領域が、収納空間SP側および開口101側(収納空間SPとは反対側)の両方の空間に面している。 In this embodiment, the first base portion 121A is joined to the first surface 111A over the entire length of the zipper tape 120. Since the low bonding strength layer is not formed on the first base portion 121A, the region where the first base portion 121A is bonded to the first surface 111A is arbitrary. On the other hand, the second base portion 121B is also joined to the second surface 111B over the entire length of the zipper tape 120. As shown in FIG. 1, the second base portion 121B and the second surface 111B are heat sealed or ultrasonically sealed. The bonding area 140 to be bonded by sealing includes a first bonding area 141 and a second bonding area 142 . In the first bonding region 141, as shown in FIG. 3, the second base portion 121B is bonded to the second surface 111B at portions other than the low bonding strength layer 124 (even if the low bonding strength layer 124 is also bonded). good). On the other hand, in the second bonding region 142, the second base portion 121B is bonded to the second surface 111B only with the low bonding strength layer 124 as shown in FIG. 2A. That is, in the second bonding region 142, the bonding region between the low bonding strength layer 124 and the second surface 111B faces both the storage space SP side and the opening 101 side (opposite side to the storage space SP). are doing.
 より具体的には、ジッパーテープ120の幅方向について、低接合強度層124は第2の基部121Bの係合部122Bの根部と開口101側(収納空間SPとは反対側)の端部との間の中間部分に形成されるため、低接合強度層124よりも開口101側に低接合強度層124ではない領域が存在する。図1に示されるように、接合領域140のうち第1の接合領域141は低接合強度層124に対して収納空間SP側に形成され、第2の接合領域142は接合領域140が開口101とは反対側、すなわち収納空間SP側に張り出すことによって形成される。 More specifically, in the width direction of the zipper tape 120, the low bonding strength layer 124 is formed between the root portion of the engaging portion 122B of the second base portion 121B and the end portion on the opening 101 side (opposite side to the storage space SP). Since it is formed in the intermediate portion between the low bonding strength layers 124 , there is a region that is not the low bonding strength layer 124 on the opening 101 side of the low bonding strength layer 124 . As shown in FIG. 1 , the first bonding region 141 of the bonding regions 140 is formed on the storage space SP side with respect to the low bonding strength layer 124 , and the second bonding region 142 is formed between the bonding region 140 and the opening 101 . is formed by projecting to the opposite side, that is, to the storage space SP side.
 このような構成によって、内容物Cが加熱されたことによって収納空間SP内の蒸気圧が上昇した場合には、図2Bに示すようにフィルム110の第2の面111Bと第1の面111Aとの間で最も接合強度が低い部分、すなわち第2の基部121Bが低接合強度層124のみで第2の面111Bに接合される第2の接合領域142が破壊される。第2の接合領域142の破壊によって第2の基部121Bは第2の面111Bから分離され、収納空間SPが外部に連通することによって蒸気が排出される。このような構成によって、本実施形態では、内容物の加熱時に安定した蒸気の放出が可能な蒸気出口を形成することができる。 With such a configuration, when the vapor pressure in the storage space SP rises due to the heating of the contents C, the second surface 111B and the first surface 111A of the film 110 are separated from each other as shown in FIG. 2B. The portion with the lowest bonding strength between the two, that is, the second bonding region 142 where the second base portion 121B is bonded to the second surface 111B only by the low bonding strength layer 124 is destroyed. The destruction of the second joint region 142 separates the second base 121B from the second surface 111B, and the storage space SP communicates with the outside to discharge steam. With such a configuration, in the present embodiment, it is possible to form a steam outlet capable of stably releasing steam during heating of the contents.
 本実施形態において、第2の基部121Bは、図2A、図2Bおよび図3に示すように、第1の接合領域141および第2の接合領域142により、フィルム110の第2の面111Bにいわゆる片側外しの状態で取り付けられている。具体的には、第2の基部121Bは、幅方向における係合部122B,123Bの位置よりも収納空間SPとは反対側のみで、第1の接合領域141および第2の接合領域142によってフィルム110の第2の面111Bに接合される。このような構成によって、内容物の加熱時に収納空間SP内の蒸気圧が増大した場合には、図2Bに矢印で示すように、第1の基部121Aおよび第2の基部121Bの間に、それぞれの基部の幅方向に沿ってせん断方向の力が作用する。この方向の力は、雌型の係合部122Bの一方の爪と雄型の係合部122Aとをより強く係合させ、また鉤型の係合部123A,123Bを互いにより強く係合させるため、蒸気圧の作用によって係合部の形状が解除されにくくなる。また、これによって、収納空間SP内の蒸気圧が、係合部だけではなく第2の基部121Bと第2の面111Bとの間に分散して作用しやすくなる。 In this embodiment, the second base 121B is attached to the second surface 111B of the film 110 by a first bond area 141 and a second bond area 142 as shown in FIGS. 2A, 2B and 3 . It is installed with one side removed. Specifically, the second base portion 121B is only on the opposite side of the storage space SP from the positions of the engagement portions 122B and 123B in the width direction, and the film is bonded by the first bonding region 141 and the second bonding region 142. It is joined to the second surface 111B of 110 . With such a configuration, when the vapor pressure in the storage space SP increases during heating of the contents, as indicated by the arrows in FIG. A force in the shear direction acts along the width direction of the base of the . The force in this direction causes one claw of the female engaging portion 122B and the male engaging portion 122A to be more strongly engaged, and the hooked engaging portions 123A and 123B to be more strongly engaged with each other. Therefore, it becomes difficult for the shape of the engaging portion to be released by the action of the steam pressure. In addition, this makes it easier for the vapor pressure in the storage space SP to act not only on the engaging portion but also on the second base portion 121B and the second surface 111B in a distributed manner.
 図4は、本発明の第1の実施形態における接合領域の配置について説明するための図である。図示されるように、本実施形態では、収納空間SPの中心SP_Cから第1の接合領域141までの最短距離d1が、収納空間SPの中心SP_Cから第2の接合領域142までの最短距離d2以上である。ここで、収納空間SPの中心SP_Cは、例えば図示されるように略矩形の収納空間SPの平面形状における対角線の交点として特定することができる。本実施形態では、収納空間SPがボトムシール部112、サイドシール部113およびジッパーテープ120の第2の基部121Bとフィルム110の第2の面111Bとが接合される接合領域140によって囲まれるため、収納空間SPに面するこれらの接合領域の交点から上記のように対角線を引くことによって中心SP_Cが特定できる。 FIG. 4 is a diagram for explaining the arrangement of joint regions in the first embodiment of the present invention. As illustrated, in this embodiment, the shortest distance d1 from the center SP_C of the storage space SP to the first joint region 141 is greater than or equal to the shortest distance d2 from the center SP_C of the storage space SP to the second joint region 142. is. Here, the center SP_C of the storage space SP can be specified, for example, as the intersection of diagonal lines in the planar shape of the substantially rectangular storage space SP as illustrated. In this embodiment, since the storage space SP is surrounded by the bottom seal portion 112, the side seal portion 113, and the bonding area 140 where the second base portion 121B of the zipper tape 120 and the second surface 111B of the film 110 are bonded, A center SP_C can be identified by drawing a diagonal line as described above from the intersection of these joint areas facing the storage space SP.
 なお、上述のようにジッパーテープ120の第1の基部121Aとフィルム110の第1の面111Aとの間の接合領域については任意の形状に形成されるが、本実施形態において中心SP_Cは第2の基部121B側の接合領域140、具体的には第1の接合領域141および第2の接合領域の配置に関連して定義されるため、第1の基部121A側ではなく第2の基部121B側の接合領域140を基準にして中心SP_Cを設定する。また、例えばサイドシール部113に代えてフィルム110の折り返し部を形成することも可能であるが、その場合は折り返し部とボトムシール部112および接合領域140との交点から対角線を引くことによって中心SP_Cが特定できる。また、ボトムシール部112またはサイドシール部113に対応する部分でフィルムが内側に折り込まれたガセットが形成される場合は、折り込まれた部分を含まない収納空間SPの外縁の平面形状について中心SP_Cが設定される。 As described above, the joint region between the first base portion 121A of the zipper tape 120 and the first surface 111A of the film 110 is formed in any shape. is defined in relation to the placement of the bonding region 140 on the base 121B side of the base 121B side, specifically the first bonding region 141 and the second bonding region. The center SP_C is set with reference to the junction region 140 of . Further, for example, it is possible to form a folded portion of the film 110 instead of the side seal portion 113. In that case, a diagonal line is drawn from the intersection of the folded portion, the bottom seal portion 112 and the bonding region 140, and the center SP_C can be identified. In addition, when a gusset is formed by folding the film inwardly at the portion corresponding to the bottom seal portion 112 or the side seal portion 113, the center SP_C of the planar shape of the outer edge of the storage space SP that does not include the folded portion is set.
 内容物の加熱時における収納空間SP内の蒸気圧は、収納空間SPの中心SP_Cで最も高くなり、中心SP_Cから離れるにつれて低くなる。従って、模式的には、収納空間SP内の蒸気圧を示す等圧線SCを、収納空間SPの中心SP_Cを中心とする円として仮定することができる。図4には、中心SP_Cを中心とし半径d1の等圧線SCが示されている。上述のように半径d1は中心SP_Cから第1の接合領域141までの最短距離でもあるため、図示された例において内容物の加熱時に第1の接合領域141にかかる蒸気圧は、等圧線SCに対応する蒸気圧以下になる。 The vapor pressure in the storage space SP during heating of the contents is highest at the center SP_C of the storage space SP, and decreases with increasing distance from the center SP_C. Schematically, therefore, the isobar SC indicating the vapor pressure in the storage space SP can be assumed to be a circle centered at the center SP_C of the storage space SP. FIG. 4 shows a constant pressure line SC centered at the center SP_C and having a radius d1. Since the radius d1 is also the shortest distance from the center SP_C to the first bonding area 141 as described above, the vapor pressure applied to the first bonding area 141 when the contents are heated in the illustrated example corresponds to the isobar SC vapor pressure below
 一方、収納空間SPの中心SP_Cから第2の接合領域142までの最短距離d2は、第1の接合領域141までの最短距離d1以下であるため、第2の接合領域142は少なくとも一部が図示された半径d1の等圧線SCよりも内側、または等圧線SC上にある。ここで、等圧線SCは、中心SP_Cを中心とし、第1の接合領域141に接する円の円周である。従って、内容物の加熱時に第2の接合領域142の少なくとも一部にかかる蒸気圧は、等圧線SCに対応する蒸気圧以上になる。この蒸気圧が第2の接合領域142における第2の基部121Bと第2の面111Bとの間の接合強度を超えると、図2Bに示したように第2の接合領域142が破壊されて蒸気出口が形成される。蒸気出口が形成されると、蒸気が排出されることによって収納空間SPの蒸気圧がそれ以上に上昇することはない。 On the other hand, since the shortest distance d2 from the center SP_C of the storage space SP to the second joint region 142 is equal to or less than the shortest distance d1 to the first joint region 141, at least a part of the second joint region 142 is illustrated. is inside or on the isobar SC with the radius d1. Here, the isobar SC is the circumference of a circle centered at the center SP_C and in contact with the first joint region 141 . Therefore, the vapor pressure applied to at least a portion of the second joint region 142 during heating of the contents is equal to or higher than the vapor pressure corresponding to the isobar SC. When this steam pressure exceeds the bond strength between the second base 121B and the second surface 111B at the second bond region 142, the second bond region 142 breaks down and vapor An exit is formed. Once the steam outlet is formed, the steam pressure in the storage space SP will not rise any further due to the steam being discharged.
 ここで、例えば、収納空間SPの中心SP_Cから第2の接合領域142までの最短距離d2は、第1の接合領域141までの最短距離d1を超えている場合、内容物の加熱時に第1の接合領域141にかかる蒸気圧が第2の接合領域142にかかる蒸気圧を超える。第1の接合領域141は第2の基部121Bが低接合強度層124以外の部分で第2の面111Bに接合された部分であるため、蒸気圧が上昇しても破壊されることはないが、第1の接合領域141を介して第2の基部121Bが強い力で引っ張られることによって係合部122A,122Bおよび係合部123A,123Bの係合が外れ、第2の接合領域142が破壊されて蒸気出口が形成される前にジッパーテープ120が開く可能性がある。 Here, for example, if the shortest distance d2 from the center SP_C of the storage space SP to the second joint region 142 exceeds the shortest distance d1 to the first joint region 141, the first The vapor pressure across bond region 141 exceeds the vapor pressure across second bond region 142 . Since the first bonding region 141 is a portion where the second base portion 121B is bonded to the second surface 111B at a portion other than the low bonding strength layer 124, it will not be destroyed even if the steam pressure increases. , the second base portion 121B is pulled with a strong force through the first joint region 141, thereby disengaging the engaging portions 122A and 122B and the engaging portions 123A and 123B, and the second joint region 142 is destroyed. The zipper tape 120 may open before the steam outlet is formed.
 本実施形態では、上述のように距離d2が距離d1以下であることによって、内容物の加熱時に第1の接合領域141にかかる蒸気圧は、第2の接合領域142の少なくとも一部にかかる蒸気圧以下になる。従って、第1の接合領域141を介して第2の基部121Bが強い力で引っ張られる前に第2の接合領域142を破壊させて蒸気出口を形成し、蒸気圧による意図しないジッパーテープ120の開放を防止することができる。 In this embodiment, since the distance d2 is equal to or less than the distance d1 as described above, the steam pressure applied to the first bonding region 141 during heating of the contents is reduced to the vapor pressure applied to at least a part of the second bonding region 142. below pressure. Therefore, before the second base portion 121B is pulled with a strong force through the first joint region 141, the second joint region 142 is destroyed to form a steam outlet, and the unintended opening of the zipper tape 120 by steam pressure is prevented. can be prevented.
 なお、蒸気圧による意図しないジッパーテープ120の開放を防止するためには、第2の接合領域142における第2の基部121Bと第2の面111Bとの間の剥離強度を低くすることも効果的である。係合部122A,122Bおよび係合部123A,123Bとして一般的なジッパーテープの係合部を想定した場合、第2の接合領域142における第2の基部121Bと第2の面111Bとの間の剥離強度は、好ましくは30N/50mm以下であり、より好ましくは20N/50mm以下であり、さらに好ましくは15N/50mm以下であり、特に好ましくは10N/50mm以下である。剥離強度の下限は特に限定されないが、例えば1N/50mmである。剥離強度を上記の範囲にするために、例えば低接合強度層124を形成する樹脂組成物の成分や、接合領域140を形成する時のシール温度を調節してもよい。上記のような剥離強度を設定することによって、より低い蒸気圧で第2の接合領域142が破壊されて蒸気出口が形成され、蒸気圧による意図しないジッパーテープ120の開放をより確実に防止することができる。 In order to prevent unintended opening of the zipper tape 120 due to steam pressure, it is also effective to lower the peel strength between the second base portion 121B and the second surface 111B in the second bonding region 142. is. Assuming that the engaging portions 122A, 122B and the engaging portions 123A, 123B are the engaging portions of a general zipper tape, the second base portion 121B and the second surface 111B in the second joint region 142 The peel strength is preferably 30 N/50 mm or less, more preferably 20 N/50 mm or less, even more preferably 15 N/50 mm or less, and particularly preferably 10 N/50 mm or less. Although the lower limit of the peel strength is not particularly limited, it is, for example, 1 N/50 mm. In order to keep the peel strength within the above range, for example, the components of the resin composition forming the low bonding strength layer 124 and the sealing temperature when forming the bonding region 140 may be adjusted. By setting the peel strength as described above, the second bonding area 142 is destroyed at a lower steam pressure to form a steam outlet, thereby more reliably preventing unintended opening of the zipper tape 120 due to steam pressure. can be done.
 なお、剥離強度は、ジッパーテープ120およびフィルム110を50mm幅にカットし、23℃、湿度50%下で約24時間放置した後、23℃、湿度50%下で図5に示すように第2の基部121Bの幅方向に沿って約180°の角度をなす反対方向に引張速度300mm/minで引っ張り、第2の接合領域142が破壊されて第2の基部121Bと第2の面111Bとの間が剥離する時の応力の最大強度を測定することによって算出することができる。引張力は、例えば、株式会社イマダ製のデジタルフォースゲージを用いて測定することができるが、この例には限定されない。 The peel strength was measured by cutting the zipper tape 120 and the film 110 into 50 mm widths, leaving them at 23° C. and 50% humidity for about 24 hours, and testing them at 23° C. and 50% humidity as shown in FIG. is pulled at a tensile speed of 300 mm/min in the opposite direction forming an angle of about 180° along the width direction of the base 121B of the second base 121B, and the second bonding region 142 is destroyed to break the second base 121B and the second surface 111B. It can be calculated by measuring the maximum strength of the stress when the gap separates. The tensile force can be measured using, for example, a digital force gauge manufactured by Imada Co., Ltd., but is not limited to this example.
 図6は、本発明の第1の実施形態における蒸気出口の配置例を示す図である。本実施形態では、第2の接合領域142が形成されるジッパーテープ120の長手方向の第1の区間Sが、長手方向中心120Cに対して偏心して配置されてもよい。偏心の割合は、長手方向中心120Cから第1の区間Sの長手方向の中間部までの距離Yのジッパーテープ付き袋100の開口幅の半分の長さXに対する比Y/Xで表される。ここで、開口幅は、ジッパーテープ120の全長からサイドシール部113によってシールされた部分を除いた長さである。第1の区間Sがジッパーテープ120の長手方向中心120Cから偏心している場合、Y>0であるため、Y/Xは0よりも大きい。Y/Xは好ましくは0.15以上であり、より好ましくは0.20以上、さらに好ましくは0.40以上、よりさらに好ましくは0.60以上、特に好ましくは0.80以上である。上限値は特に限定されず、1未満である。なお、蒸気出口が形成される区間のうち複数の区間が上記の第1の区間Sと同様に偏心している場合は、各区間の長手方向の中間部からジッパーテープ120の長手方向中心120Cまでの距離のうち最大のものを距離Yとして、上記のY/Xに関する条件を満たせばよい。 FIG. 6 is a diagram showing an arrangement example of steam outlets in the first embodiment of the present invention. In this embodiment, the first longitudinal section S1 of the zipper tape 120 in which the second joint region 142 is formed may be arranged eccentrically with respect to the longitudinal center 120C. The ratio of eccentricity is represented by the ratio Y/X of the distance Y from the longitudinal center 120C to the longitudinal middle part of the first section S1 to the half length X of the opening width of the bag 100 with zipper tape. . Here, the width of the opening is the total length of the zipper tape 120 excluding the portion sealed by the side seal portion 113 . When the first section S1 is eccentric from the longitudinal center 120C of the zipper tape 120, Y/X is greater than 0 because Y>0. Y/X is preferably 0.15 or more, more preferably 0.20 or more, still more preferably 0.40 or more, even more preferably 0.60 or more, and particularly preferably 0.80 or more. The upper limit is not particularly limited and is less than 1. In addition, when a plurality of sections among the sections in which the steam outlet is formed are eccentric like the above-described first section S1 , from the longitudinal middle portion of each section to the longitudinal center 120C of the zipper tape 120 With the maximum distance Y as the distance Y, the above condition regarding Y/X should be satisfied.
 また、上記の例において、ジッパーテープ120の長手方向における第1の区間Sの長さW(形成される蒸気出口の幅にほぼ等しい)のジッパーテープ付き袋100の開口幅の半分の長さXに対する比W/Xは、0.04以上が好ましく、0.05以上がより好ましく、0.10以上がさらに好ましく、0.15以上が特に好ましい。上限に特に制限はなく、用いる食品等の特徴により適宜調整するが、例えば0.6である。これは、蒸気出口の幅が狭すぎるとジッパーテープ120の長手方向中央部の変形量が大きくなるためである。なお、蒸気出口が形成される区間のうち複数の区間が上記の第1の区間Sと同様に偏心している場合は、いずれか1つの区間の長さWが上記のW/Xに関する条件を満たせばよい。 In the above example, the length W of the first section S1 in the longitudinal direction of the zipper tape 120 (approximately equal to the width of the formed steam outlet) is half the opening width of the zipper tape-attached bag 100. The ratio W/X to X is preferably 0.04 or more, more preferably 0.05 or more, still more preferably 0.10 or more, and particularly preferably 0.15 or more. The upper limit is not particularly limited, and is appropriately adjusted depending on the characteristics of the food used, and is, for example, 0.6. This is because if the width of the steam outlet is too narrow, the amount of deformation at the central portion in the longitudinal direction of the zipper tape 120 increases. If a plurality of sections among the sections in which the steam outlet is formed are eccentric like the first section S1 , the length W of any one section satisfies the above condition regarding W/X. should be filled.
 図7は、本発明の第1の実施形態における接合領域の配置の変形例を示す図である。図7に示された例では、ジッパーテープ120の長手方向について複数の第2の接合領域142A,142Bが設けられる。図示された例において、収納空間SPの中心から第2の接合領域142A,142Bのそれぞれまでの最短距離は、収納空間SPの中心から第1の接合領域141までの最短距離以下である。このような第2の接合領域142A,142Bが複数設けられていることによって、内容物Cの加熱時には複数の蒸気出口が形成され、より安定して蒸気が放出されることによって収納空間SPの蒸気圧の上昇が抑えられ、蒸気圧による意図しないジッパーテープ120の開放をより確実に防止できる。なお、図示された例では2つの第2の接合領域142A,142Bが設けられるが、3つ以上の第2の接合領域が設けられてもよい。また、図示された例では第2の接合領域142A,142Bがいずれもジッパーテープ120の長手方向中心に重複せずに設けられているが、いずれか一方がジッパーテープ120の長手方向中心に重複して第2の接合領域が設けられてもよい。 FIG. 7 is a diagram showing a modification of the arrangement of joint regions in the first embodiment of the present invention. In the example shown in FIG. 7, a plurality of second joint regions 142A, 142B are provided in the longitudinal direction of the zipper tape 120. As shown in FIG. In the illustrated example, the shortest distance from the center of the storage space SP to each of the second joint regions 142A and 142B is less than or equal to the shortest distance from the center of the storage space SP to the first joint region 141. By providing a plurality of such second joint regions 142A and 142B, a plurality of steam outlets are formed when the content C is heated, and the steam in the storage space SP is discharged more stably. A rise in pressure is suppressed, and unintended opening of the zipper tape 120 due to steam pressure can be more reliably prevented. Although two second bonding regions 142A and 142B are provided in the illustrated example, three or more second bonding regions may be provided. In the illustrated example, the second joint regions 142A and 142B are provided at the center of the zipper tape 120 in the longitudinal direction without overlapping, but one of them overlaps the center of the zipper tape 120 in the longitudinal direction. A second bonding area may be provided at the bottom.
 図8は、本発明の第1の実施形態における接合領域の形状の変形例を示す図である。図8に示された例では、第2の接合領域142が、ジッパーテープ120の長手方向について非対称な形状を有する。より具体的には、第2の接合領域142は、収納空間SP側の端縁がジッパーテープ120の長手方向中心側に向かって引き延ばされた形状を有する。例えば、蒸気出口の位置が決められている場合に、蒸気出口と収納空間SPの中心SP_Cとを結ぶ線に沿って第2の接合領域142の形状を引き延ばしてもよい。 FIG. 8 is a diagram showing a modification of the shape of the joint region in the first embodiment of the present invention. In the example shown in FIG. 8 , the second joining area 142 has an asymmetrical shape with respect to the longitudinal direction of the zipper tape 120 . More specifically, the second joint region 142 has a shape in which the end edge on the side of the storage space SP is extended toward the longitudinal center of the zipper tape 120 . For example, when the position of the steam outlet is determined, the shape of the second joint region 142 may be extended along a line connecting the steam outlet and the center SP_C of the storage space SP.
 このようにして引き延ばされた第2の接合領域142の収納空間SP側の先端の形状を鋭角にすることによって、蒸気圧が上昇したときに応力を集中させ、第2の接合領域142を剥離しやすくすることができる。一方、第2の接合領域142の収納空間SP側の先端の形状を鈍角、または丸みを帯びた形状にすることによって、接合領域形成時の位置ずれによって収納空間SPの中心SP_Cから第2の接合領域142までの最短距離d2が大きく変動するのを防止することができる。本変形例における第2の接合領域142の収納空間SP側の先端の形状は、例えば上記のような要素を考慮して決定される。 By making the shape of the end of the extended second joint region 142 on the side of the storage space SP into an acute angle, stress is concentrated when the steam pressure rises, and the second joint region 142 is expanded. It can be easily peeled off. On the other hand, by making the shape of the tip of the second joint region 142 on the side of the storage space SP obtuse or rounded, the second joint can be formed from the center SP_C of the storage space SP due to positional deviation during formation of the joint region. It is possible to prevent the shortest distance d2 to the area 142 from fluctuating significantly. The shape of the end of the second joint region 142 on the storage space SP side in this modified example is determined, for example, in consideration of the above factors.
 第2の接合領域142を上記のような形状にすることによって、例えば蒸気出口をジッパーテープ120の長手方向中心から離れた位置に形成する場合でも、第2の接合領域142の収納空間SP側の端縁を収納空間SPの中心に近づけ、距離d2を距離d1以下にすることができる。これによって、内容物の加熱時には、第1の接合領域141にかかる蒸気圧が上昇する前に第2の接合領域142の収納空間SP側の端縁から剥離が始まって蒸気出口が形成され、意図しないジッパーテープ120の開放を防止することができる。 By forming the second joint region 142 in the above-described shape, for example, even when the steam outlet is formed at a position away from the longitudinal center of the zipper tape 120, the second joint region 142 on the side of the storage space SP The edge can be brought closer to the center of the storage space SP, and the distance d2 can be less than or equal to the distance d1. As a result, when the content is heated, peeling starts from the end edge of the second joint region 142 on the side of the storage space SP before the vapor pressure applied to the first joint region 141 rises, forming a vapor outlet. It is possible to prevent the zipper tape 120 from being opened.
 (第2の実施形態)
 図9は、本発明の第2の実施形態に係るジッパーテープ付き袋の平面図である。図10A、図10Bおよび図11は、図9に示した袋体のX-X線およびXI-XI線の断面図である。以下、これらの図を参照して、本実施形態に係るジッパーテープ付き袋の構成について説明する。
(Second embodiment)
FIG. 9 is a plan view of a bag with zipper tape according to a second embodiment of the present invention. 10A, 10B and 11 are cross-sectional views of the bag shown in FIG. 9 taken along line XX and line XI-XI. The configuration of the zipper tape-equipped bag according to the present embodiment will be described below with reference to these drawings.
 図示されているように、ジッパーテープ付き袋200は、互いに対向する第1の面111Aおよび第2の面111Bを有するフィルム110によって形成される袋状の容器本体と、フィルム110の第1の面111Aおよび第2の面111Bの間に配置されるジッパーテープ220とを含む。ジッパーテープ220は、後述するように全長にわたって幅方向の少なくとも一部が第1の面111Aおよび第2の面111Bに接合されており、これによってフィルム110の第1の面111Aおよび第2の面111Bの間に形成される収納空間SPの一辺を画定する。なお、フィルム110の構成については、上記の第1の実施形態と同様であるため重複した説明は省略する。 As illustrated, the zipper tape-attached bag 200 includes a bag-like container body formed by a film 110 having a first surface 111A and a second surface 111B facing each other, and a first surface of the film 110. and a zipper tape 220 disposed between 111A and second surface 111B. As will be described later, the zipper tape 220 has at least a portion of its entire length in the width direction joined to the first surface 111A and the second surface 111B, thereby connecting the first surface 111A and the second surface of the film 110 together. It defines one side of the storage space SP formed between 111B. Note that the configuration of the film 110 is the same as that of the first embodiment described above, and redundant description will be omitted.
 ジッパーテープ220は、第1の面111Aに接合される第1の基部221Aと、第2の面111Bに接合される第2の基部221Bと、第1の基部221Aおよび第2の基部221Bの互いに対向する面からそれぞれ突出し互いに係合可能な係合部222Aおよび係合部222Bとを断面形状に含む長尺状の部材である。ジッパーテープ220は、例えばポリオレフィン系樹脂の押出成形によって形成される。より具体的には、ジッパーテープ220は、低密度ポリエチレン(LDPE)、直鎖状低密度ポリエチレン(LLDPE)、またはポリプロピレン(PP)で形成されてもよい。PPは、ホモポリプロピレン(HPP)、ランダムポリプロピレン(RPP)、またはブロックポリプロピレン(BPP)であってもよい。ポリオレフィン系樹脂は、化石燃料由来の樹脂には限られず、環境に配慮したバイオプラスチック(バイオマス由来のバイオポリエチレンやバイオポリプロピレンなどのポリオレフィン系樹脂)であってもよいし、化石燃料由来の樹脂とバイオプラスチックの混合物であってもよい。ジッパーテープ220の材料には、必要に応じて、公知の添加剤、例えば安定剤、酸化防止剤、滑剤、帯電防止剤、または着色剤などが添加されてもよい。 Zipper tape 220 includes first base 221A joined to first surface 111A, second base 221B joined to second surface 111B, and first base 221A and second base 221B joined to each other. It is an elongated member including, in a cross-sectional shape, an engaging portion 222A and an engaging portion 222B that protrude from opposing surfaces and are capable of engaging with each other. The zipper tape 220 is formed, for example, by extrusion molding of polyolefin resin. More specifically, zipper tape 220 may be formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). PP can be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). Polyolefin-based resins are not limited to fossil fuel-derived resins, and may be environmentally friendly bioplastics (polyolefin-based resins such as biomass-derived bio-polyethylene or bio-polypropylene). It may be a mixture of plastics. Known additives such as stabilizers, antioxidants, lubricants, antistatic agents, or colorants may be added to the material of the zipper tape 220, if necessary.
 なお、係合部222Aおよび係合部222Bは、図示された例のような形状に限られず、爪状、鉤状、または瘤状などを組み合わせた公知の各種のジッパーテープの係合部の形状にすることが可能である。また、図示された例では1対の係合部222Aおよび係合部222Bが配置されているが、複数対の係合部222Aおよび係合部222Bが配置されてもよい。係合部222Aおよび係合部222Bは、ジッパーテープ付き袋200を封止、開封、および再封止することを可能にする。 The engaging portions 222A and the engaging portions 222B are not limited to the shapes shown in the drawings, and various known shapes of the engaging portions of zipper tapes, such as claw-shaped, hook-shaped, or knob-shaped, are combined. It is possible to In addition, although one pair of engaging portion 222A and engaging portion 222B is arranged in the illustrated example, a plurality of pairs of engaging portion 222A and engaging portion 222B may be arranged. Engaging portion 222A and engaging portion 222B allow zipper tape bag 200 to be sealed, opened, and resealed.
 本実施形態では、ジッパーテープ220の断面形状が、第1の樹脂組成物で形成された第1の部分225と、第2の樹脂組成物で形成された第2の部分226とを含む。第1の部分225は第1の樹脂組成物で形成され、第2の部分226は第2の樹脂組成物で形成される。より具体的には、第2の部分226は、第2の面111Bに対向する第2の基部221Bの一部(面221B1として図示する)を形成する。一方、第1の部分225は、第1の基部221A、係合部222A、および係合部222Bの全部と、第2の面111Bに対向する面(面221B2として図示する)を含む第2の基部221Bの残りの部分とを形成する。 In this embodiment, the cross-sectional shape of the zipper tape 220 includes a first portion 225 made of the first resin composition and a second portion 226 made of the second resin composition. The first portion 225 is made of a first resin composition, and the second portion 226 is made of a second resin composition. More specifically, second portion 226 forms a portion of second base 221B (shown as surface 221B1) that faces second surface 111B. On the other hand, the first portion 225 includes all of the first base portion 221A, the engaging portion 222A, and the engaging portion 222B, and a second surface (illustrated as surface 221B2) that faces the second surface 111B. It forms the rest of the base 221B.
 上記の第2の部分226を形成する第2の樹脂組成物は、第1の部分225を形成する第1の樹脂組成物とは異なる樹脂組成物である。例えば、表1に例示するような構成によって、内容物の加熱時における第1の部分225と第2の部分226との間の接合強度が、第1の部分225と第2の面111Bおよび第1の面111Aのそれぞれとの間、および第2の部分226と第2の面111Bとの間の接合強度よりも低くなっている。表1の例において、第1の樹脂組成物はポリプロピレンであり、第2の樹脂組成物はポリエチレンである。具体的には、例えば第2の面111Bと第2の部分226との間に第3の樹脂組成物で第3の部分(図示せず)を形成したり、第2の面111Bと第2の部分226との間に接着剤を介在させたりすることによって第2の部分226と第2の面111Bとの間の接合強度を高め、第1の部分225と第2の部分226との間の接合強度を相対的に第2の部分226と第2の面111Bとの間の接合強度よりも低くすることができる。 The second resin composition forming the second portion 226 is a resin composition different from the first resin composition forming the first portion 225 . For example, with the configuration illustrated in Table 1, the bonding strength between the first portion 225 and the second portion 226 during heating of the contents is increased between the first portion 225 and the second surface 111B and the second surface 111B. It is lower than the bonding strength between each of the first surfaces 111A and between the second portion 226 and the second surface 111B. In the example of Table 1, the first resin composition is polypropylene and the second resin composition is polyethylene. Specifically, for example, a third resin composition may be used to form a third portion (not shown) between the second surface 111B and the second portion 226, or a third portion (not shown) may be formed between the second surface 111B and the second portion 226. The bonding strength between the second portion 226 and the second surface 111B is increased by interposing an adhesive between the first portion 225 and the second surface 111B, and the first portion 225 and the second portion 226 can be relatively lower than the bond strength between the second portion 226 and the second surface 111B.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
 あるいは、表2に例示するような樹脂組成物の組み合わせを採用することによって、内容物の加熱時における第1の部分225と第2の部分226との間の接合強度を、第1の部分225と第2の面111Bおよび第1の面111Aのそれぞれとの間、および第2の部分226と第2の面111Bとの間の接合強度よりも低くしてもよい。なお、表2においてTmは融点を意味する。 Alternatively, by adopting a combination of resin compositions as exemplified in Table 2, the bonding strength between the first portion 225 and the second portion 226 during heating of the contents can be adjusted to the first portion 225 and each of the second surface 111B and the first surface 111A and between the second portion 226 and the second surface 111B. In Table 2, Tm means melting point.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
 本実施形態において、第1の基部221Aは、ジッパーテープ220の全長で第1の面111Aに接合される。第1の基部221Aは全体が第1の樹脂組成物で形成される第1の部分225であるため、第1の基部221Aを第1の面111Aに接合する領域は任意である。一方、第2の基部221Bもジッパーテープ220の全長で第2の面111Bに接合されるが、第2の基部221Bと第2の面111Bとをヒートシールまたは超音波シールによって接合する接合領域240は、第1の接合領域241および第2の接合領域242を含む。第1の接合領域241では、図11に示すように第1の部分225(面221B2)で第2の面111Bに接合される(第2の部分226でも接合されてもよい)。一方、第2の接合領域242では、図10Aに示すように第2の基部221Bが第2の部分226(面221B1)のみで第2の面111Bに接合される。つまり、第2の接合領域142では、第2の部分226(面221B1)と第2の面111Bとの接合領域が、収納空間SP側および開口101側(収納空間SPとは反対側)の両方の空間に面している。 In this embodiment, the first base portion 221A is joined to the first surface 111A over the entire length of the zipper tape 220. Since the first base portion 221A is the first portion 225 entirely formed of the first resin composition, the region where the first base portion 221A is joined to the first surface 111A is arbitrary. On the other hand, the second base portion 221B is also joined to the second surface 111B over the entire length of the zipper tape 220, but there is a joint region 240 where the second base portion 221B and the second surface 111B are joined by heat sealing or ultrasonic sealing. includes a first junction area 241 and a second junction area 242 . In the first bonding region 241, as shown in FIG. 11, the first portion 225 (surface 221B2) is bonded to the second surface 111B (the second portion 226 may also be bonded). On the other hand, in the second bonding region 242, as shown in FIG. 10A, the second base 221B is bonded to the second surface 111B only at the second portion 226 (surface 221B1). That is, in the second joint region 142, the joint region between the second portion 226 (surface 221B1) and the second surface 111B is located on both the storage space SP side and the opening 101 side (the side opposite to the storage space SP). facing the space.
 より具体的には、ジッパーテープ220の幅方向について、第2の部分226は第2の基部221Bの係合部222Bの根部と開口101側(収納空間SPとは反対側)の端部との間の中間部分に形成されるため、第2の部分226よりも開口101側に第1の部分225が存在する。図9に示されるように、接合領域240のうち第1の接合領域241は第2の部分226に対して収納空間SP側に位置する第1の部分225に形成され、第2の接合領域242は接合領域240が開口101とは反対側、すなわち収納空間SP側に張り出すことによって形成される。 More specifically, in the width direction of the zipper tape 220, the second portion 226 is formed between the root portion of the engaging portion 222B of the second base portion 221B and the end portion on the opening 101 side (opposite side to the storage space SP). The first portion 225 exists closer to the opening 101 than the second portion 226 because it is formed in the intermediate portion between them. As shown in FIG. 9, the first joint region 241 of the joint region 240 is formed in the first portion 225 located on the storage space SP side with respect to the second portion 226, and the second joint region 242 is formed by projecting the joint region 240 to the side opposite to the opening 101, that is, to the side of the storage space SP.
 このような構成によって、内容物Cが加熱されたことによって収納空間SP内の蒸気圧が上昇した場合には、図10Bに示すようにフィルム110の第2の面111Bと第1の面111Aとの間で最も接合強度が低い部分、すなわちジッパーテープ220の第1の部分225と第2の部分226との間の接合が破壊される。上記のような接合の破壊によって第2の基部221Bにおける第2の部分226(面221B1を含む部分)が第1の部分225(面221B2を含む残りの部分)から分離され、収納空間SPが外部空間に連通することによって蒸気が排出される。このような構成によって、本実施形態では、内容物の加熱時に安定した蒸気の放出が可能な蒸気出口を形成することができる。 With such a configuration, when the vapor pressure in the storage space SP rises due to the heating of the contents C, the second surface 111B and the first surface 111A of the film 110 are separated as shown in FIG. 10B. The portion with the lowest bond strength between , that is, the bond between the first portion 225 and the second portion 226 of the zipper tape 220 is destroyed. By breaking the joint as described above, the second portion 226 (the portion including the surface 221B1) of the second base portion 221B is separated from the first portion 225 (the remaining portion including the surface 221B2), and the storage space SP is exposed to the outside. Vapor is discharged by communicating with the space. With such a configuration, in the present embodiment, it is possible to form a steam outlet capable of stably releasing steam during heating of the contents.
 本実施形態において、第2の基部221Bは、図10A、図10Bおよび図11に示すように、第1の接合領域241および第2の接合領域242により、フィルム110の第2の面111Bにいわゆる片側外しの状態で取り付けられている。具体的には、第2の基部221Bは、幅方向における係合部222Bの位置よりも収納空間SPとは反対側のみで、第1の接合領域241および第2の接合領域242によってフィルム110の第2の面111Bに接合される。このような構成によって、内容物の加熱時に収納空間SP内の蒸気圧が増大した場合には、図10Bに矢印で示すように、第1の基部221Aおよび第2の基部221Bの間に、それぞれの基部の幅方向に沿ってせん断方向の力が作用する。この方向の力は、雌型の係合部222Bの一方の爪と雄型の係合部122Aとをより強く係合させるため、蒸気圧の作用によって係合部の形状が解除されにくくなる。また、これによって、収納空間SP内の蒸気圧が、係合部だけではなく第2の基部221Bと第2の面211Bとの間に分散して作用しやすくなる。 In this embodiment, the second base 221B is attached to the second surface 111B of the film 110 by a first bond area 241 and a second bond area 242 as shown in FIGS. 10A, 10B and 11 . It is installed with one side removed. Specifically, the second base portion 221B is attached to the film 110 by the first bonding region 241 and the second bonding region 242 only on the opposite side of the housing space SP from the position of the engaging portion 222B in the width direction. It is joined to the second surface 111B. With such a configuration, when the vapor pressure in the storage space SP increases during heating of the contents, as indicated by the arrows in FIG. A force in the shear direction acts along the width direction of the base of the . Since the force in this direction causes one claw of the female engaging portion 222B to engage the male engaging portion 122A more strongly, the shape of the engaging portion is less likely to be released by the action of steam pressure. In addition, this makes it easier for the vapor pressure in the storage space SP to act not only on the engaging portion but also on the second base portion 221B and the second surface 211B in a distributed manner.
 本実施形態でも、図1や図8を参照して説明した例と同様に、収納空間SPの中心から第1の接合領域241までの最短距離が、収納空間SPの中心から第2の接合領域242までの最短距離以上である。収納空間SPの中心は、上記で第1の実施形態について説明したのと同様にして定義される。上記のように第1の接合領域241および第2の接合領域242を配置することによって、内容物Cの加熱時に第1の接合領域241にかかる蒸気圧は、第2の接合領域242の少なくとも一部にかかる蒸気圧以下になる。従って、第1の接合領域241を介して第2の基部221Bが強い力で引っ張られる前に第2の接合領域242で第1の部分225と第2の部分226との間の接合を破壊させて蒸気出口を形成し、蒸気圧による意図しないジッパーテープ220の開放を防止することができる。 1 and 8, the shortest distance from the center of the storage space SP to the first joint region 241 is the second joint region from the center of the storage space SP. 242 or greater. The center of the storage space SP is defined in the same manner as described for the first embodiment above. By arranging the first bonding region 241 and the second bonding region 242 as described above, the vapor pressure applied to the first bonding region 241 during heating of the contents C is reduced to at least one of the second bonding regions 242. below the vapor pressure applied to the Therefore, the bond between the first portion 225 and the second portion 226 is broken at the second bond region 242 before the second base 221B is pulled with a strong force through the first bond region 241. to form a steam outlet to prevent unintentional opening of the zipper tape 220 due to steam pressure.
 また、本実施形態でも、第1の部分225と第2の部分226との間の剥離強度を、好ましくは20N/50mm以下、より好ましくは15N/50mm以下、さらに好ましくは10N/50mm以下としてもよい、剥離強度の下限は特に限定されないが、例えば1N/50mmである。剥離強度を上記の範囲にするために、例えば第1の部分225および第2の部分226を形成する樹脂組成物の成分を調整してもよい。上記のような剥離強度を設定することによって、より低い蒸気圧で第1の部分225と第2の部分226との間の接合が破壊されて蒸気出口が形成され、蒸気圧による意図しないジッパーテープ220の開放をより確実に防止することができる。また、第1の実施形態について図6、図7および図8を参照して説明したような接合領域の配置および形状の変形例は、第2の実施形態においても適用可能である。 Also in this embodiment, the peel strength between the first portion 225 and the second portion 226 is preferably 20 N/50 mm or less, more preferably 15 N/50 mm or less, and even more preferably 10 N/50 mm or less. Although the lower limit of peel strength is not particularly limited, it is, for example, 1 N/50 mm. For example, the components of the resin composition forming the first portion 225 and the second portion 226 may be adjusted so that the peel strength falls within the above range. By setting the peel strength as described above, a lower steam pressure breaks the bond between the first portion 225 and the second portion 226 to form a steam outlet, resulting in unintended zipper tape peeling due to steam pressure. 220 can be more reliably prevented from opening. In addition, the modified examples of the arrangement and shape of the joint regions as described with reference to FIGS. 6, 7 and 8 for the first embodiment can also be applied to the second embodiment.
 以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はこれらの例に限定されない。本発明の属する技術の分野の当業者であれば、請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It is obvious that a person skilled in the art of the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. Naturally, it is understood that it belongs to the technical scope of the present invention.
 100…ジッパーテープ付き袋、101…開口、110…フィルム、111A…第1の面、111B…第2の面、112…ボトムシール部、113…サイドシール部、120…ジッパーテープ、121A…第1の基部、121B…第2の基部、122A,122B,123A,123B…係合部、124…低接合強度層、140…接合領域、141…第1の接合領域、142,142A,142B…第2の接合領域、200…ジッパーテープ付き袋、220…ジッパーテープ、221A…第1の基部、221B…第2の基部、222A,222B…係合部、225…第1の部分、226…第2の部分、240…接合領域、241…第1の接合領域、242…第2の接合領域、C…内容物、SC…等圧線、SP…収納空間、SP_C…中心、d1,d2…最短距離。 DESCRIPTION OF SYMBOLS 100... Bag with a zipper tape, 101... Opening, 110... Film, 111A... 1st surface, 111B... 2nd surface, 112... Bottom seal part, 113... Side seal part, 120... Zipper tape, 121A... 1st surface base, 121B... second base, 122A, 122B, 123A, 123B... engaging portion, 124... low bonding strength layer, 140... bonding area, 141... first bonding area, 142, 142A, 142B... second 200... bag with zipper tape, 220... zipper tape, 221A... first base, 221B... second base, 222A, 222B... engaging portion, 225... first portion, 226... second Portion 240... Joining area 241... First joining area 242... Second joining area C... Contents SC... Isobaric line SP... Storage space SP_C... Center d1, d2... Shortest distance.

Claims (11)

  1.  少なくとも互いに対向する第1の面および第2の面を有し、前記第1の面および前記第2の面の間に収納空間が形成される容器本体と、
     前記第1の面と前記第2の面との間に配置されて前記収納空間の一辺を画定し、前記第1の面に接合される第1の基部、前記第1の基部から突出する第1の係合部、前記第2の面に接合される第2の基部、および前記第2の基部から突出し前記第1の係合部に係合可能な第2の係合部を含むジッパーテープと
     を備えるジッパーテープ付き容器であって、
     前記第2の面に面する前記第2の基部の一部に前記容器本体との接合強度が前記ジッパーテープの他の部分よりも低くなるように構成された低接合強度層が形成され、
     前記第2の基部と前記第2の面との間の接合領域は、前記第2の基部が前記低接合強度層以外の部分で前記第2の面に接合される第1の接合領域と、前記第2の基部が前記低接合強度層のみで前記第2の面に接合される第2の接合領域とを含み、
     前記収納空間の中心から前記第1の接合領域までの最短距離が、前記収納空間の中心から前記第2の接合領域までの最短距離以上であるジッパーテープ付き容器。
    a container body having at least a first surface and a second surface facing each other, wherein a storage space is formed between the first surface and the second surface;
    a first base disposed between the first surface and the second surface to define one side of the storage space and joined to the first surface; a first base projecting from the first base; A zipper tape including one engaging portion, a second base joined to the second surface, and a second engaging portion projecting from the second base and engageable with the first engaging portion. A container with a zipper tape, comprising:
    A low bonding strength layer is formed on a portion of the second base facing the second surface so that bonding strength to the container body is lower than that of other portions of the zipper tape,
    A bonding region between the second base and the second surface includes a first bonding region where the second base is bonded to the second surface at a portion other than the low bonding strength layer; a second bonding region where the second base is bonded to the second surface only with the low bonding strength layer;
    A container with a zipper tape, wherein the shortest distance from the center of the storage space to the first joint area is equal to or greater than the shortest distance from the center of the storage space to the second joint area.
  2.  前記ジッパーテープの幅方向について、前記低接合強度層は前記第2の基部の前記第2の係合部の根部と前記収納空間とは反対側の端部との間の中間部分に形成され、
     前記第1の接合領域は、前記低接合強度層に対して前記収納空間とは反対側に形成され、
     前記第2の接合領域は、前記接合領域が前記収納空間側に張り出すことによって形成される、請求項1に記載のジッパーテープ付き容器。
    In the width direction of the zipper tape, the low bonding strength layer is formed in an intermediate portion between the root portion of the second engaging portion of the second base portion and the end portion opposite to the storage space,
    The first bonding region is formed on the side opposite to the storage space with respect to the low bonding strength layer,
    2. The container with a zipper tape according to claim 1, wherein said second joint area is formed by projecting said joint area toward said storage space.
  3.  少なくとも互いに対向する第1の面および第2の面を有し、前記第1の面および前記第2の面の間に収納空間が形成される容器本体と、
     前記第1の面と前記第2の面との間に配置されて前記収納空間の一辺を画定し、前記第1の面に接合される第1の基部、前記第1の基部から突出する第1の係合部、前記第2の面に接合される第2の基部、および前記第2の基部から突出し前記第1の係合部に係合可能な第2の係合部を含むジッパーテープと
     を備えるジッパーテープ付き容器であって、
     前記第2の面に面する前記第2の基部の一部が、前記第1の基部および前記第2の基部の残りの部分を形成する第1の樹脂組成物とは異なる第2の樹脂組成物で形成され、
     前記第2の基部と前記第2の面との間の接合領域は、前記第2の基部が前記第1の樹脂組成物で形成される部分で前記第2の面に接合される第1の接合領域と、前記第2の基部が前記第2の樹脂組成物で形成される部分のみで前記第2の面に接合される第2の接合領域とを含み、
     前記収納空間の中心から前記第1の接合領域までの最短距離が、前記収納空間の中心から前記第2の接合領域までの最短距離以上であるジッパーテープ付き容器。
    a container body having at least a first surface and a second surface facing each other, wherein a storage space is formed between the first surface and the second surface;
    a first base disposed between the first surface and the second surface to define one side of the storage space and joined to the first surface; a first base projecting from the first base; A zipper tape including one engaging portion, a second base joined to the second surface, and a second engaging portion projecting from the second base and engageable with the first engaging portion. A container with a zipper tape, comprising:
    a second resin composition in which the portion of the second base facing the second surface is different from the first resin composition forming the first base and the remaining portion of the second base; made up of things
    The bonding region between the second base and the second surface is a first base portion bonded to the second surface at a portion where the second base is formed of the first resin composition. a bonding region, and a second bonding region bonded to the second surface only at a portion where the second base is formed of the second resin composition,
    A container with a zipper tape, wherein the shortest distance from the center of the storage space to the first joint area is equal to or greater than the shortest distance from the center of the storage space to the second joint area.
  4.  前記第2の接合領域は、前記ジッパーテープの長手方向中心に重複しない、請求項1から請求項3のいずれか1項に記載のジッパーテープ付き容器。 The container with a zipper tape according to any one of claims 1 to 3, wherein the second joint region does not overlap with the longitudinal center of the zipper tape.
  5.  前記第2の接合領域は、前記ジッパーテープの長手方向の第1の区間に形成され、前記ジッパーテープの長手方向中心から前記第1の区間の長手方向の中間部までの距離Yの前記ジッパーテープ付き容器の開口幅の半分の長さXに対する比Y/Xが0.15以上である、請求項1から請求項4のいずれか1項に記載のジッパーテープ付き容器。 The second joint region is formed in a first section in the longitudinal direction of the zipper tape, and the zipper tape has a distance Y from the center in the longitudinal direction of the zipper tape to an intermediate portion in the longitudinal direction of the first section. The container with zipper tape according to any one of claims 1 to 4, wherein the ratio Y/X to the half length X of the opening width of the container with zipper tape is 0.15 or more.
  6.  前記ジッパーテープの長手方向について複数の前記第2の接合領域が設けられる、請求項1から請求項5のいずれか1項に記載のジッパーテープ付き容器。 The container with a zipper tape according to any one of claims 1 to 5, wherein a plurality of said second joint regions are provided in the longitudinal direction of said zipper tape.
  7.  前記第2の接合領域における前記第2の基部と前記第2の面との間の剥離強度は、30N/50mm以下である、請求項1から請求項6のいずれか1項に記載のジッパーテープ付き容器。 The zipper tape according to any one of claims 1 to 6, wherein the peel strength between the second base and the second surface in the second bonding area is 30 N/50 mm or less. container with.
  8.  前記第2の接合領域は、少なくとも一部が、前記収納空間の中心を中心とし、前記第1の接合領域に接する円の円周よりも内側に位置する、請求項1から請求項7のいずれか1項に記載のジッパーテープ付き容器。 8. The second joint region according to any one of claims 1 to 7, wherein at least a portion of the second joint region is located inside a circumference of a circle centered on the center of the storage space and in contact with the first joint region. or the container with a zipper tape according to item 1.
  9.  前記第2の接合領域は、前記収納空間側の端縁が前記ジッパーテープの長手方向中心側に向かって引き延ばされた形状を有する、請求項1から請求項8のいずれか1項に記載のジッパーテープ付き容器。 9. The second joint region according to any one of claims 1 to 8, wherein the end edge on the storage space side has a shape extending toward the center in the longitudinal direction of the zipper tape. container with zipper tape.
  10.  前記第2の基部は、幅方向における前記第2の係合部の位置よりも前記収納空間とは反対側のみで、前記接合領域によって前記第2の面に接合される、請求項1から請求項9のいずれか1項に記載のジッパーテープ付き容器。 The second base portion is joined to the second surface by the joint region only on the opposite side of the storage space from the position of the second engaging portion in the width direction. Item 9. The container with a zipper tape according to any one of Items 9.
  11.  前記容器本体は、袋状である、請求項1から請求項10のいずれか1項に記載のジッパーテープ付き容器。 The container with a zipper tape according to any one of claims 1 to 10, wherein the container body is bag-shaped.
PCT/JP2022/042791 2021-11-18 2022-11-18 Zipper tape container WO2023090410A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021024602A (en) * 2019-08-01 2021-02-22 出光ユニテック株式会社 Container with zipper tape and method for manufacturing container with zipper tape
WO2021206150A1 (en) * 2020-04-08 2021-10-14 凸版印刷株式会社 Pouch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021024602A (en) * 2019-08-01 2021-02-22 出光ユニテック株式会社 Container with zipper tape and method for manufacturing container with zipper tape
WO2021206150A1 (en) * 2020-04-08 2021-10-14 凸版印刷株式会社 Pouch

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