WO2024034510A1 - Frozen-food-preserving bag body, and method for producing same - Google Patents

Frozen-food-preserving bag body, and method for producing same Download PDF

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Publication number
WO2024034510A1
WO2024034510A1 PCT/JP2023/028399 JP2023028399W WO2024034510A1 WO 2024034510 A1 WO2024034510 A1 WO 2024034510A1 JP 2023028399 W JP2023028399 W JP 2023028399W WO 2024034510 A1 WO2024034510 A1 WO 2024034510A1
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WIPO (PCT)
Prior art keywords
dot
bag
joints
frozen food
weakened
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PCT/JP2023/028399
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French (fr)
Japanese (ja)
Inventor
徹 渡辺
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株式会社Ｗ
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Publication of WO2024034510A1 publication Critical patent/WO2024034510A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS 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
    • B65D81/00—Containers, 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
    • B65D81/34—Containers, 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 bag for storing frozen food and a method for manufacturing the same, and more particularly to a bag for storing frozen food that stores and preserves cooked frozen food, and a method for manufacturing the same.
  • Patent Document 1 a method has been proposed in which fine holes are provided in the bag and the generated water vapor is released outside the bag.
  • Patent Documents 2 to 4 a technique has been proposed in which a weak seal is provided in a part of the bag and the weak seal is peeled off during heating in a microwave oven to form a gas vent path.
  • Patent Document 1 the fine pores need to be sufficiently small to prevent foreign matter from entering, and it may be difficult to sufficiently release water vapor.
  • Patent Documents 2 to 4 it is possible to obtain a bag in which foreign matter is prevented from entering, and a weakly sealed portion peels off when heated in a microwave oven to form a ventilation path.
  • the present invention was made in view of these points, and although it has a simple structure, it reliably peels off when heated in a microwave oven to form a degassing passage, and does not peel off during transportation or storage.
  • An object of the present invention is to provide a bag body having a section.
  • the present invention was made in view of these points, and although it has a simple structure, it reliably peels off when heated in a microwave oven to form a degassing passage, and does not peel off during transportation or storage.
  • An object of the present invention is to provide a method for manufacturing a bag having a section.
  • a frozen food storage bag for storing cooked frozen food
  • the bag body is formed of a film,
  • the bag has at least one end portion a joint where the films are overlapped and joined to seal the inside of the bag;
  • a weakened part having a lower bonding strength than other parts of the joint is provided in a part of the joint so as to cross the joint in a direction from the inside of the bag to the outside,
  • the stacked films are interconnected only by a plurality of dot-like joints;
  • the plurality of dot-like joints are arranged over the entire width of the weakened portion such that the peel strength of a portion of the weakened portion located on the inside side of the bag is lower than the peel strength of other portions of the weakened portion.
  • the plurality of dot-like joints are arranged such that a portion of the region covered by the plurality of dot-like joints facing the internal space of the bag tapers toward the inside of the bag. .
  • the plurality of dot-like joints are arranged such that the area covered by the plurality of dot-like joints has a shape that tapers toward the inside of the bag body.
  • the plurality of dot-like joints are arranged so that the region covered by the plurality of dot-like joints has a substantially V-shape that tapers toward the inside of the bag.
  • the plurality of dot-like joints are arranged in at least a portion of the weakened portion so that the number of the weakened portions in the width direction increases from the inside to the outside of the bag.
  • the widthwise position of the dot-like joint within the weakened portion is located between two dot-like joints that are adjacent to the dot-like joint in the outer direction of the bag body and lined up in the width direction of the weakened portion. It is arranged so that
  • the dot-like joints form a row extending in the width direction of the weakened portion, and the rows are arranged from the inside of the bag toward the outside.
  • the bonding strength of the bonded portion adjacent to the weakened portion is set higher than the bonding strength of other portions of the bonded portion.
  • the weakened portions are provided at two opposite ends of the bag, respectively.
  • the dimensions of the dot-like joints are 0.1 mm or more and 1 mm or less.
  • the bag has a rectangular shape with a length in the vertical direction of 10 cm or more and 60 cm or less, and a length in the horizontal direction of 10 cm or more and 40 cm or less,
  • the band-shaped joint has a width of 0.2 mm or more and 20 mm or less,
  • the length of the weakened portion along the band-like joint is 10 mm or more and 60 mm or less.
  • a method for manufacturing a bag for storing frozen food is provided.
  • a frozen food for storage is provided in which a cooked frozen food of 100 g or more and 1000 g or less is stored in the bag.
  • a bag having a weakened portion that has a simple structure, but which reliably peels off when heated in a microwave oven and does not peel off during transportation or storage.
  • a method for producing a bag having a weakened portion that has a simple structure but that peels off reliably when heated in a microwave oven to form a degassing passage and does not peel off during transportation or storage. is provided.
  • FIG. 1 is a schematic plan view of a bag for storing frozen food according to a preferred embodiment of the present invention. It is a typical drawing for demonstrating the specific structure of a weakened part. It is a typical drawing for explaining the modification of a weakened part. It is a typical drawing for explaining the modification of a weakened part. 1 is a schematic drawing showing the configuration of an ultrasonic bonding machine used in the ultrasonic bonding machine.
  • FIG. 2 is a perspective view schematically showing the configuration of an anvil used in an ultrasonic bonding machine.
  • cooked frozen foods refer to frozen cooked foods such as dumplings, shumai, and fried chicken. Such frozen foods do not require any further cooking and can be eaten by simply heating them in a microwave oven.
  • frozen food for preservation refers to cooked frozen food stored in a bag together with a plastic tray or the like as required.
  • the frozen food storage bag is a bag that stores cooked frozen food for frozen storage.
  • FIG. 1 is a schematic plan view of a bag 10 for storing frozen food according to a preferred embodiment of the present invention.
  • the bag 10 is made by folding a horizontally long rectangular film 12 in two along the center line in the width direction, with a top seal part 14 (joint part) at the top and a bottom seal part 16 at the bottom. , is formed by sealing the side portions where the ends of the films are overlapped with each other with side seal portions 18.
  • the film used for the film 12 is preferably one that can be ultrasonically bonded, and may be a film made of polyethylene, polypropylene, polystyrene, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polycarbonate, styrene-acrylonitrile copolymer, or a laminate of these. Examples include films that Furthermore, bondable papers can also be used as films.
  • the thickness of the film 12 is preferably 15 ⁇ m or more and 150 ⁇ m or less, more preferably 20 ⁇ m or more and 100 ⁇ m or less. If the film thickness is less than 15 ⁇ m, the strength of the bag may be insufficient, and if it exceeds 150 ⁇ m, it may be disadvantageous in terms of cost.
  • the film may be transparent or opaque, but it is preferable to use an opaque packaging film to prevent the contents from deteriorating due to sunlight. It may also be a film whose surface is printed to enhance its design.
  • one weakened part 20 is provided in a part of the top seal part 14 by partially cutting off the top seal part 14 extending along the upper end of the bag 10. .
  • This weakened portion 20 has a lower peel strength per unit area between the films 12 than other portions of the top seal portion 14, and is configured such that the films are peeled off with a lower force than other portions of the top seal portion 14. has been done.
  • the weakened portion 20 is provided to extend across the top seal portion 14 from the inside to the outside of the bag body 10, so that when the bonded film 12 is peeled off at the weakened portion 20, the bag A gas vent passage is formed that communicates the inside and outside of the body 10.
  • the weakened portion 20 causes the films 12 to separate from each other due to internal pressure generated by water vapor generated by the food, etc.
  • a degassing passage that communicates the inside and outside of the bag 10 is formed in the top seal portion 14.
  • one weakened part 20 is provided in the top seal part 14, but in the bag of the present invention, at least one weakened part is provided in at least one seal part. Good.
  • a configuration may be adopted in which each of the top seal portion 14 and the bottom seal portion 16 is provided with one weakened portion 20. The number and location of the weakened parts are determined as appropriate, taking into consideration conditions such as how much internal pressure is generated during heating with a microwave oven or the like.
  • the width of the top seal portion 14 in which the weakened portion 20 is formed (the length in the inner and outer directions of the bag body 10) is preferably 0.2 mm or more and 20 mm or less, and more preferably 0.3 mm or more and 10 mm or less. If it is less than 0.2 mm, the bonding strength may be insufficient, and if it exceeds 20 mm, it may be undesirable in terms of design or processing.
  • the tip portion 22 of the top seal portion 14 adjacent to the weakened portion 20, where the weakened portion 20 is formed may have a higher bonding strength than other portions of the seal portion.
  • the width of the tip portion 22 of the top seal portion 14 adjacent to the weakened portion 20 (the length in the X direction in FIG. 1) is set to be larger than the width of other portions of the top seal portion 14.
  • FIG. 2 is a schematic drawing for explaining the specific configuration of the weakening section 20.
  • the weakened portion 20 has a function of forming an exhaust passage by peeling off the connected film 12 when water vapor or the like is generated within the bag body 10 and the pressure increases due to heating in a microwave oven or the like. It is equipped with In order to exhibit such a function, the weakened portion 20 is configured such that the peel strength of the portion located inside the bag (in this embodiment, the innermost portion) is lower than the peel strength of other portions of the weakened portion. has been done.
  • the weakened portion 20 of the bag 10 of this embodiment extends across the top seal portion 14 in the seal width direction (direction from the inside to the outside of the bag 10).
  • the two stacked films 12 are connected only by a plurality of dot-like joints 24 that join the two films 12 in a dotted manner.
  • the plurality of dot-like joints 24 extend from the inside of the bag 10 to the outside in the width direction of the top seal part 14 (X direction in FIG. 1), and in the width direction (Y direction in FIG. 1) of the weakened part 20. They are distributed over the entire width of the weakened portion 20 (the entire length in the Y direction in FIG. 1) so that the number of the weakened portions 20 increases.
  • the length (width) of the weakened portion 20 in the Y direction is set to 10 mm or more and 60 mm or less. If the length (width) of the weakened part 20 is less than 10 m, it may not be possible to sufficiently discharge the generated water vapor, and if it exceeds 60 mm, the water vapor discharge part may not be completely peeled off.
  • the length (width) of the weakened portion 20 in the Y direction is more preferably 12 mm or more and 45 mm or less, and even more preferably 15 mm or more and 50 mm or less.
  • FIG. 2 is an enlarged schematic diagram showing the weakened portion 20 of the bag 10 of FIG. 1.
  • the plurality of dot-shaped joints 24 approximately expand from the inside of the bag 10 toward the outside within the weakened portion 20. They are arranged in a V-shape. Each dot-shaped joint 24 has a circular dot shape with the same dimensions, and joins the stacked films 12 to each other.
  • the plurality of dot-like joints 24 are arranged such that the peel strength of the weakened portion 20 located at the innermost portion of the bag body 10 is lower than the peel strength of other portions of the weakened portion 20.
  • the dot-like joints 24 form a plurality of rows of dot-like joints 24 lined up in the width direction (Y direction) of the weakened portion 20. Rows of books are arranged from the inside of the bag 10 to the outside.
  • the number of dot-like joints constituting each of the plurality of rows increases from the inside of the bag to the outside (along the direction of arrow X) in the inside part of the bag body of the weakened part 20.
  • the dot-like joints 24 constituting each of the plurality of rows are arranged so as to be located outward in the width direction of the weakened portion 20 as they go from the inside of the bag to the outside.
  • the weakened portion 20 of the bag 10 of this embodiment as shown in FIGS.
  • the bag 10 is arranged so that the portion facing the internal space tapers toward the inside of the bag 10.
  • the plurality of dot-like joints 24 have a generally V-shaped overall shape, with the area covered by the plurality of dot-like joints 24 tapering toward the inside of the bag body 10. It is arranged so that it forms.
  • a cooked frozen food for example, frozen shumai placed on the tray 26 is sealed in the bag 10 configured in this manner.
  • the plurality of dot-like joints 24 are arranged in a row in the width direction of the weakened portion 20 (direction of arrow Y in FIG. 1). Six rows are arranged from the inside to the outside of the bag body 10 as the first to sixth rows.
  • the first row is composed of one dot-like joint 24, and this one dot-like joint 24 is arranged at the innermost position of the bag body 10 at the center of the weakened part 20 in the width direction (Y direction). has been done.
  • the second row is composed of four dot-like joints 24 arranged at equal intervals, and these four dot-like joints 24 are arranged in the first row at the center position of the weakened part 20 in the width direction (Y direction). It is placed on the outside of the (bag body).
  • the second row is configured such that two central portions of the dot-like joints 24 constituting the second row are offset from the dot-like joints 24 of the first row in the X direction.
  • the dot-shaped joints 24 in the first row are arranged so that the positions in the width direction (Y direction) of the weakened portion 20 are adjacent to the outer side of the bag body 10 and lined up in the width direction of the weakened portion 20 at the center of the second row. It is arranged so as to be aligned in the X direction with the middle position of the two dot-like joints 24, 24.
  • the third row is composed of five dot-like joints 24 arranged at equal intervals, and these five dot-like joints 24 are arranged in the second row at the center position of the weakened part 20 in the width direction (Y direction). is placed outside.
  • the third row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the second row in the X direction.
  • the dot-like joints 24 in the second row are arranged so that the width direction (Y direction) positions of the weakened portions 20 are adjacent to the outer side of the bag body 10 and lined up in the width direction of the weakened portions 20 in the third row. It is arranged so as to be aligned in the X direction with the middle position of the two dot-like joints 24, 24.
  • the fourth row is composed of eight dot-like joints 24 arranged at equal intervals, and these eight dot-like joints 24 are arranged in the third row at the center position of the weakened part 20 in the width direction (Y direction). is placed outside.
  • the fourth row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the third row in the X direction.
  • the dot-like joints 24 in the third row are arranged so that the positions in the width direction (Y direction) of the weakened portions 20 are adjacent to the outer side of the bag body 10 and lined up in the width direction of the weakened portions 20 in the fourth row. It is arranged so as to be aligned in the X direction with the middle position of the two dot-like joints 24, 24.
  • the fifth row is constituted by two sets of four dot-like joints 24 arranged at equal intervals, each set including the outer two dot-like joints 24 of the fourth row of dot-like joints 24. It is arranged outside the fourth row so as to be located further outward in the width direction. Note that the fifth row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the fourth row in the X direction. As a result, the two outer dot-like joints 24 in the fourth row are located adjacent to each other in the width direction (Y direction) of the weakened portion 20 in the outer direction of the bag body 10 and in the width direction of the weakened portion 20 in the fifth row. It is arranged so as to be aligned in the X direction with the middle position of the two dot-like joints 24, 24 lined up.
  • the sixth row is constituted by two sets of three equally spaced dot-like joints 24, each set having one outer dot-like joint 24 connected to the fifth row of dot-like joints 24. It is arranged at a widthwise position located further outward in the widthwise direction and outside of the fifth row. Note that the sixth row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the fifth row in the X direction.
  • the two outer dot-shaped joints 24 in the fifth row are located adjacent to each other in the width direction (Y direction) of the weakened portion 20 in the outer direction of the bag body 10 and in the width direction of the weakened portion 20 in the sixth row. It is arranged so as to be aligned in the X direction with the middle position of the two dot-like joints 24, 24 lined up.
  • the peel strength of the first row (peel strength between stacked films), which is the portion of the weakened portion 20 located inside the bag body 10, is lower than the peel strength of other portions of the weakened portion 20.
  • the distance (Y-direction distance) between adjacent dot-like joints 24 in the same row is set to 0.5 mm or more and 2 mm or less.
  • this distance is more preferably 0.8 mm or more and 1.85 mm or less, and even more preferably 1 mm or more and 1.7 mm or less.
  • the distance between each row of the dot-like joints 24 is set to 0.5 mm or more and 1.5 mm or less.
  • this distance is more preferably 0.55 mm or more and 1.2 mm or less, and even more preferably 0.6 mm or more and 1.0 mm or less.
  • each dot-like joint is circular, but there is no particular restriction on the shape, and it may be square, irregular shape, or the like.
  • the size (diameter) of each circular dot-shaped joint 24 is set to 0.1 mm or more and 1 mm or less. This is because if the size of the dot-shaped joint portion 24 is less than 0.1 mm, the strength of the weakened portion 20 may become insufficient, and if it exceeds 1 mm, the discharge of water vapor may become insufficient.
  • this dimension is more preferably 0.15 mm or more and 0.58 mm or less, and even more preferably 0.2 mm or more and 0.6 mm or less.
  • the above dimensions are the length of the diagonal line if the dot-shaped joint is square, and the diameter of the smallest circumscribed circle if the dot-shaped joint is amorphous.
  • all the dot-shaped joint portions 24 have the same size and shape.
  • the present invention is not limited to this, and the sizes of the dot-like joints do not all need to be the same.
  • the size of the dot-like joints in the first row smaller than the size of the dot-like joints in the rear row, it is possible to obtain the effect that peeling becomes easier when heated in a microwave oven.
  • the number and arrangement of the dot-shaped joints 24 in the weakened portion are not limited to the above embodiments, and may be arranged as shown in FIGS. 3 and 4, for example.
  • the number of rows of the dot-like joints 24 is six in the bag 10 of the above embodiment, but preferably 2 or more and 10 or less. By having two or more rows of dot-like joints, it is possible to prevent the weakened parts from peeling off when the product is dropped or subjected to vibration during transportation or storage, and by having no more than 10 rows, , peeling becomes easier when heated in a microwave oven.
  • the number of rows of dot-like joints is more preferably 3 or more and 8 or less, and even more preferably 4 or more and 6 or less.
  • the number of dots in each row is preferably 1 or more and 16 or less, more preferably 1 or more and 12 or less. Although there is no particular restriction on the number of dots in each column, it is necessary that the number of dots in the first column is smaller than the number of dots in the other columns. By making the number of dots in the first row smaller than the number of dots in the other rows, it becomes easier to peel off when heated in a microwave oven.
  • the number of dot-like joints in the first row is preferably from 1 to 5, more preferably from 1 to 4, and even more preferably from 1 to 3.
  • the number of dot-like joints in the second and subsequent rows is not particularly limited, but is preferably 2 or more and 16 or less, more preferably 3 or more and 12 or less, and even more preferably 4 or more and 8 or less.
  • the dot-shaped joints By arranging the dot-shaped joints in this way, the weakened parts are prevented from peeling off when dropped or subjected to vibration during transportation or storage, and by arranging the dot-shaped joints in 10 rows or less, Peeling becomes easier when heated.
  • the dot-like joints do not necessarily have to be arranged in a row, and may be arranged so that the peel strength of the weakened part located on the inside of the bag is lower than that of other parts of the weakened part, for example.
  • the weakened portion may be arranged over the entire width of the weakened portion so that the portion of the area covered by the plurality of dot-shaped joints facing the internal space of the bag tapers toward the inside of the bag.
  • FIG. 5 is a schematic diagram showing the configuration of an ultrasonic bonding machine used in the ultrasonic bonding machine.
  • the ultrasonic bonding machine 50 includes an ultrasonic oscillator 52 that converts commercial electricity of 50 Hz or 60 Hz into a high frequency signal of approximately 15 to 70 KHz, a converter 54 that converts this signal into mechanical vibration, and a converter that amplifies this mechanical vibration.
  • a known basic configuration includes a booster 56 that transmits amplified vibrations to the welding target, a flat horn 58 that transmits amplified vibrations to the welding target, and a flat anvil 60 that sandwiches the films 12, 12 between the horn 58. This is an ultrasonic bonding machine with
  • the horn 58 used to manufacture the bag of this embodiment has a smooth surface
  • the anvil 60 has a surface with convex portions corresponding to the dot-like joints 24 as described later.
  • the length of the horn 58 and the anvil 60 is about 50 mm to 450 mm, and the width of the horn 58 and the anvil 60 is about 7 mm to 25 mm.
  • Horn 58 and anvil 60 are preferably made of known materials, particularly stainless steel or titanium alloy.
  • edges of the surfaces of the horn 58 and anvil 60 may be chamfered. By chamfering, it is possible to prevent the film 12 from being cut at this portion.
  • the anvil 60 is moved up and down by a drive device (not shown) to sandwich the two films 12 between it and the horn 58. In this state, ultrasonic waves are applied to the horn 58 to simultaneously form the top seal portion 14 and the weakened portion 20 on the bag body.
  • a pressure of about 20N to 500N is applied between the horn 58 and the anvil 60 by a pressure device (not shown).
  • the bonding time is preferably about 0.01 seconds or more and 10 seconds or less, more preferably 0.03 seconds or more and 5 seconds or less, and even more preferably 0.05 seconds or more and 3 seconds or less.
  • the bonding time is preferably about 0.01 seconds or more and 10 seconds or less, more preferably 0.03 seconds or more and 5 seconds or less, and even more preferably 0.05 seconds or more and 3 seconds or less.
  • FIG. 6 is a perspective view schematically showing the configuration of an anvil 60 used in the ultrasonic bonding machine 50.
  • the anvil 60 is of a flat plate type, and has rectangular convex portions 74, 74 corresponding to the top seal portion 14 of the bag body 10 and a plurality of protrusions 76 corresponding to the dot-shaped joint portions 24 arranged on the surface 62. There is.
  • the dimensions, shape, and arrangement of the convex portions 74, 74 and the protrusion 76 are set to be complementary to the dimensions, shape, and arrangement of the top seal portion 14 and dot-shaped joint portion 24 of the bag body 10.
  • the heights of the convex portions 74, 74 and the protrusion 76 are set to 0.2 mm or more and 1.0 mm or less. If the height of the convex parts 74, 74 and the protrusion 76 is less than 0.2 mm, the bonding strength between the top seal part 14 and the dot-shaped joint part 24 may be insufficient, and if it exceeds 1.0 mm, the film may be damaged at the edges. This is because it may break and fail to join properly.
  • the height of the convex portions 74, 74 and the protrusion 76 is more preferably 0.25 mm or more and 0.8 mm or less, and even more preferably 0.3 mm or more and 0.5 mm or less.
  • the cross-sectional shapes of the protrusions 74, 74 and the protrusions 76 are preferably rectangular, semicircular, or trapezoidal, but semicircular or trapezoidal are particularly preferable from the viewpoint of preventing the film from being cut at the edges.
  • the frozen food storage bag and frozen food according to a preferred embodiment of the present invention can be manufactured, for example, by the following method.
  • (1) Prepare the film.
  • (2) This film is folded in two and heat-sealed or ultrasonically bonded to form side seals.
  • (3) Furthermore, a bottom seal portion is formed.
  • a bag for storing frozen food is formed by the above method.
  • (5) Store the frozen food in the formed bag for storing frozen food.
  • a flat anvil having a surface with irregularities corresponding to the weakened portion is joined with an ultrasonic welding machine having a flat horn with a smooth surface to form a top seal portion having a weakened portion.
  • an ultrasonic welding machine having a flat horn with a smooth surface to form a top seal portion having a weakened portion.
  • a frozen food stored in a bag for storing frozen food having a weakened portion in the top seal portion is manufactured.
  • the frozen food storage bag and the method for manufacturing frozen food of the present invention are not limited to this, and for example, the number of water vapor discharge sections and the positions where they are provided can be changed as necessary.
  • steps (1) and (2) above are performed in one step, and steps (3) to (6) are repeated.
  • steps (3) to (6) are repeated.
  • a modification there is a method in which the top seal portion of a bag body and the bottom seal portion of an adjacent bag body are formed at the same time, and then the two bags are separated. In this case, (6) and (3) to the next bag will be performed at the same time.
  • Bag body 12 Bag body 12: Film 14: Top seal portion 16: Bottom seal portion 18: Side seal portion 20: Weakened portion 22: Tip portion of the top seal portion adjacent to the weakened portion 24: Dot-shaped joint portion 26: Tray

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Abstract

Provided is a bag body having a weakened section that reliably peels away during heating by a microwave oven to form a gas venting passage, but does not peel away during transport or storage, while having a simple configuration.　The present invention provides a frozen-food-preserving bag body 10 for preserving frozen food that is already cooked, wherein: the bag body is formed from films 12; the bag body comprises, at least at one end section thereof, a joining part 14 at which the films are joined so as to overlap one another and which seals the interior of the bag body; a weakened section 20 that has lower joining strength than other portions of the joining part is provided to one section of the joining part so as to cross the joining part in a direction from the interior of the bag body toward the exterior thereof; in the weakened section, the overlapped films are connected to one another by only a plurality of dot-form joining parts 24; and the plurality of dot-form joining parts are disposed across the entire width of the weakened section such that the peel strength of a portion of the weakened section that is positioned on the interior side of the bag body is lower than the peel strength of other portions of the weakened section.

Description

冷凍食品保存用袋体およびその製造方法Frozen food storage bag and its manufacturing method
　本発明は、冷凍食品保存用袋体およびその製造方法に関し、詳細には、調理済みの冷凍食品を収納して保存する冷凍食品保存用袋体およびその製造方法に関する。 The present invention relates to a bag for storing frozen food and a method for manufacturing the same, and more particularly to a bag for storing frozen food that stores and preserves cooked frozen food, and a method for manufacturing the same.
　袋体に収納された調理済み冷凍食品が数多く販売されている。このような冷凍食品は更なる調理は不要で、電子レンジで加熱するだけで食用に供される。このような冷凍食品は、輸送中や保存中の異物の混入を防ぐため、袋体内で密封された状態で保存等する必要がある。 There are many ready-to-eat frozen foods on sale that are packaged in bags. Such frozen foods require no further cooking and can be eaten by simply heating them in a microwave oven. Such frozen foods need to be stored in a sealed bag in order to prevent foreign matter from entering the food during transportation or storage.
　一方、袋体に収納した調理済み冷凍食品を電子レンジで加熱すると、内部で発生した水蒸気等による内圧で袋体が破裂する、内部の樹脂製のトレイが変形する等の不具合が生じる場合がある。 On the other hand, when cooked frozen food stored in a bag is heated in a microwave oven, problems may occur such as the bag bursting due to internal pressure due to water vapor generated inside the bag, or the resin tray inside deforming. .
　このような問題に対処すべく、袋体に微細な孔を設け、発生した水蒸気を袋体外に放出する方法が提案されている(特許文献１)。 In order to deal with such problems, a method has been proposed in which fine holes are provided in the bag and the generated water vapor is released outside the bag (Patent Document 1).
　また、袋体の一部に弱シール部を設け、電子レンジによる加熱時に弱シール部が剥離してガス抜き路が形成される技術も提案されている(特許文献２乃至４) Additionally, a technique has been proposed in which a weak seal is provided in a part of the bag and the weak seal is peeled off during heating in a microwave oven to form a gas vent path (Patent Documents 2 to 4).
特開２００２-２９１４５６号公報JP2002-291456A 特開２００１-２９２７０８号公報JP2001-292708A 特開平１０-０９５４７２号公報Japanese Patent Application Publication No. 10-095472 特開平１０-０９５４７３号公報Japanese Patent Application Publication No. 10-095473
　しかしながら、特許文献１の構成では、微細な孔は異物の混入を防止するために充分小さい必要があり、水蒸気を充分に放出することが難しい場合がある。 However, in the configuration of Patent Document 1, the fine pores need to be sufficiently small to prevent foreign matter from entering, and it may be difficult to sufficiently release water vapor.
　また、特許文献２ないし４の構成によれば異物の混入を防止され、電子レンジで加熱した時に弱シール部分が剥離して通気路が形成される袋体が得られる。 Further, according to the configurations of Patent Documents 2 to 4, it is possible to obtain a bag in which foreign matter is prevented from entering, and a weakly sealed portion peels off when heated in a microwave oven to form a ventilation path.
　このような弱シール部分を形成するためには、接着力の小さい別部材を用る、剥離強度を変えるための複数の工程が必要である等の複雑な工程等が必要であった。
　このため、簡単な構成でありながら、電子レンジによる加熱時には確実に剥離し、輸送中や保存中には剥離しない弱化部を有する袋体が望まれていた。 In order to form such a weak seal portion, complicated steps are required, such as using a separate member with low adhesive strength and requiring multiple steps to change the peel strength.
For this reason, there has been a need for a bag that has a weakened portion that has a simple structure, but that can be reliably peeled off when heated in a microwave oven, and that does not peel off during transportation or storage.
　本発明はこのような点に鑑みてなされたものであり、簡単な構成でありながら、電子レンジによる加熱時には確実に剥離してガス抜き通路を形成し、輸送中や保存中には剥離しない弱化部を有する袋体を提供することを目的とする。 The present invention was made in view of these points, and although it has a simple structure, it reliably peels off when heated in a microwave oven to form a degassing passage, and does not peel off during transportation or storage. An object of the present invention is to provide a bag body having a section.
　本発明はこのような点に鑑みてなされたものであり、簡単な構成でありながら、電子レンジによる加熱時には確実に剥離してガス抜き通路を形成し、輸送中や保存中には剥離しない弱化部を有する袋体の製造方法を提供することを目的とする。 The present invention was made in view of these points, and although it has a simple structure, it reliably peels off when heated in a microwave oven to form a degassing passage, and does not peel off during transportation or storage. An object of the present invention is to provide a method for manufacturing a bag having a section.
　本発明によれば、
　調理済みの冷凍食品を保存するための冷凍食品保存用袋体であって、
　前記袋体はフィルムによって形成され、
　前記袋体は、前記フィルムが互いに重ねて接合され前記袋体の内部を封止する接合部を少なくとも一つの端部に備え、
　前記接合部の一部に、前記接合部の他の部分より接合強度が低い弱化部が、前記接合部を前記袋体の内部から外部に向う方向に横断するように設けられ、
　前記弱化部では、前記重ねられたフィルムが複数のドット状接合部によってのみ相互に接続され、
　前記複数のドット状接合部は、前記弱化部の前記袋体の内部側に位置する部分の剥離強度が前記弱化部の他の部分の剥離強度より低くなるように、前記弱化部の全幅にわたって配置されている、
　ことを特徴とする冷凍食品保存用袋体が提供される。 According to the invention,
A frozen food storage bag for storing cooked frozen food,
The bag body is formed of a film,
The bag has at least one end portion a joint where the films are overlapped and joined to seal the inside of the bag;
A weakened part having a lower bonding strength than other parts of the joint is provided in a part of the joint so as to cross the joint in a direction from the inside of the bag to the outside,
In the weakened portion, the stacked films are interconnected only by a plurality of dot-like joints;
The plurality of dot-like joints are arranged over the entire width of the weakened portion such that the peel strength of a portion of the weakened portion located on the inside side of the bag is lower than the peel strength of other portions of the weakened portion. has been,
A frozen food storage bag body characterized by the following is provided.
　本発明の他の好ましい態様によれば、
　前記複数のドット状接合部は、該複数のドット状接合部によって覆われる領域の前記袋体の内部空間に面する部分が前記袋体の内部側に向かって先細りするように、配置されている。 According to another preferred embodiment of the invention,
The plurality of dot-like joints are arranged such that a portion of the region covered by the plurality of dot-like joints facing the internal space of the bag tapers toward the inside of the bag. .
　本発明の他の好ましい態様によれば、
　前記複数のドット状接合部は、該複数のドット状接合部によって覆われる領域が前記袋体の内部側に向かって先細りする形状を有するように、配置されている。 According to another preferred embodiment of the invention,
The plurality of dot-like joints are arranged such that the area covered by the plurality of dot-like joints has a shape that tapers toward the inside of the bag body.
　本発明の他の好ましい態様によれば、
　前記複数のドット状接合部は、該複数のドット状接合部によって覆われる領域が前記袋体の内部側に向かって先細りする略Ｖ字形状を有するように、配置されている。 According to another preferred embodiment of the invention,
The plurality of dot-like joints are arranged so that the region covered by the plurality of dot-like joints has a substantially V-shape that tapers toward the inside of the bag.
　本発明の他の好ましい態様によれば、
　前記複数のドット状接合部は、前記弱化部の少なくとも一部において、前記袋体の内部側から外部側に向かって、前記弱化部の幅方向の数が増加するように配置されている。 According to another preferred embodiment of the invention,
The plurality of dot-like joints are arranged in at least a portion of the weakened portion so that the number of the weakened portions in the width direction increases from the inside to the outside of the bag.
　本発明の他の好ましい態様によれば、
　前記ドット状接合部は、前記弱化部内の幅方向位置が、該ドット状接合部に前記袋体の外側方向に隣接し前記弱化部の幅方向に並んだ２つのドット状接合部の間に位置するように配置されている。 According to another preferred embodiment of the invention,
The widthwise position of the dot-like joint within the weakened portion is located between two dot-like joints that are adjacent to the dot-like joint in the outer direction of the bag body and lined up in the width direction of the weakened portion. It is arranged so that
　本発明の他の好ましい態様によれば、
　前記ドット状接合部は、前記弱化部の幅方向に延びる列を構成し、この列が、前記袋体の内部から外部に向かって並ぶように配置されている。 According to another preferred embodiment of the invention,
The dot-like joints form a row extending in the width direction of the weakened portion, and the rows are arranged from the inside of the bag toward the outside.
　本発明の他の好ましい態様によれば、
　前記弱化部に隣接する前記接合部の接合強度が、前記接合部の他の部分の接合強度より高く設定されている。 According to another preferred embodiment of the invention,
The bonding strength of the bonded portion adjacent to the weakened portion is set higher than the bonding strength of other portions of the bonded portion.
　本発明の他の好ましい態様によれば、
　前記弱化部が、前記袋体の反対側の２つの端に、それぞれ、設けられている。 According to another preferred embodiment of the invention,
The weakened portions are provided at two opposite ends of the bag, respectively.
　本発明の他の好ましい態様によれば、
　前記ドット状接合部の寸法が0.1ｍｍ以上１ｍｍ以下である。 According to another preferred embodiment of the invention,
The dimensions of the dot-like joints are 0.1 mm or more and 1 mm or less.
　本発明の他の好ましい態様によれば、
　前記袋体が、縦方向の長さが10ｃｍ以上60ｃｍ以下、横方向の長さが10ｃｍ以上40ｃｍ以下の矩形形状を有し、
　前記帯状接合部は、0.2ｍｍ以上20ｍｍ以下の幅を有し、
　前記弱化部は前記帯状接合に沿った長さが、10ｍｍ以上60ｍｍ以下である。 According to another preferred embodiment of the invention,
The bag has a rectangular shape with a length in the vertical direction of 10 cm or more and 60 cm or less, and a length in the horizontal direction of 10 cm or more and 40 cm or less,
The band-shaped joint has a width of 0.2 mm or more and 20 mm or less,
The length of the weakened portion along the band-like joint is 10 mm or more and 60 mm or less.
　本発明の他の態様によれば、
　前記帯状接合部と前記弱化部に対応した形状を有する平板型アンビルと、平滑な表面を持つ平板型ホーンとによって２枚のフィルムを接合するステップを有する、
　ことを特徴とする冷凍食品保存用袋体の製造方法が提供される。 According to another aspect of the invention:
a step of joining two films by a flat anvil having a shape corresponding to the band-shaped joint and the weakened portion, and a flat horn having a smooth surface;
A method for manufacturing a bag for storing frozen food is provided.
　本発明の他の態様によれば、
　上記袋体に１００ｇ以上１０００ｇ以下の調理済み冷凍食品を収納した保存用冷凍食品が提供される。 According to another aspect of the invention:
A frozen food for storage is provided in which a cooked frozen food of 100 g or more and 1000 g or less is stored in the bag.
　本発明によれば、簡単な構成でありながら、電子レンジによる加熱時には確実に剥離し、輸送中や保存中には剥離しない弱化部を有する袋体が提供される。 According to the present invention, there is provided a bag having a weakened portion that has a simple structure, but which reliably peels off when heated in a microwave oven and does not peel off during transportation or storage.
　また、本発明によれば、簡単な構成でありながら、電子レンジによる加熱時には確実に剥離してガス抜き通路を形成し、輸送中や保存中には剥離しない弱化部を有する袋体の製造方法が提供される。 Further, according to the present invention, a method for producing a bag having a weakened portion that has a simple structure but that peels off reliably when heated in a microwave oven to form a degassing passage and does not peel off during transportation or storage. is provided.
本発明の好ましい実施形態の冷凍食品保存用の袋体の模式的な平面図である。FIG. 1 is a schematic plan view of a bag for storing frozen food according to a preferred embodiment of the present invention. 弱化部の具体的構成を説明するための模式的な図面である。It is a typical drawing for demonstrating the specific structure of a weakened part. 弱化部の変形例を説明するための模式的な図面である。It is a typical drawing for explaining the modification of a weakened part. 弱化部の変形例を説明するための模式的な図面である。It is a typical drawing for explaining the modification of a weakened part. 超音波接合機で使用される超音波接合機の構成を示す模式的な図面である。1 is a schematic drawing showing the configuration of an ultrasonic bonding machine used in the ultrasonic bonding machine. 超音波接合機で使用されるアンビルの構成を模式的に示す斜視図である。FIG. 2 is a perspective view schematically showing the configuration of an anvil used in an ultrasonic bonding machine.
　以下、本発明の好ましい実施形態の冷凍食品保存用の袋体について説明する。
　なお、本願において、調理済み冷凍食品とは餃子、シュウマイ、鳥の唐揚げなどの調理済みの食品を冷凍したものを指す。このような冷凍食品は、更なる調理は不要で、電子レンジで加熱するだけで食用に供される。また、保存用冷凍食品とは、調理済み冷凍食品を、必要に応じてプラスチック製のトレイ等と共に、袋体に収納したものを指す。さらに、冷凍食品保存用袋体とは、冷凍保存のために調理済み冷凍食品を収納する袋体である。 Hereinafter, a bag for storing frozen food according to a preferred embodiment of the present invention will be described.
In this application, cooked frozen foods refer to frozen cooked foods such as dumplings, shumai, and fried chicken. Such frozen foods do not require any further cooking and can be eaten by simply heating them in a microwave oven. Moreover, frozen food for preservation refers to cooked frozen food stored in a bag together with a plastic tray or the like as required. Furthermore, the frozen food storage bag is a bag that stores cooked frozen food for frozen storage.
　以下に、図１に沿って、本発明の好ましい実施形態の冷凍食品保存用の袋体１０について説明する。
　図１は、本実施形態の好ましい実施形態の冷凍食品保存用の袋体１０の模式的な平面図である。
　図１に示されているように、袋体１０は、横長の矩形のフィルム１２を幅方向中心線で２つの折畳み、上部をトップシール部１４(接合部)で、下部をボトムシール部１６で、フィルムの端が重ね合わされた側部をサイドシール部１８によって封止することにより形成されている。 Below, along FIG. 1, a bag 10 for storing frozen food according to a preferred embodiment of the present invention will be described.
FIG. 1 is a schematic plan view of a bag 10 for storing frozen food according to a preferred embodiment of the present invention.
As shown in FIG. 1, the bag 10 is made by folding a horizontally long rectangular film 12 in two along the center line in the width direction, with a top seal part 14 (joint part) at the top and a bottom seal part 16 at the bottom. , is formed by sealing the side portions where the ends of the films are overlapped with each other with side seal portions 18.
　フィルム１２に用いるフィルムとしては、超音波接合が可能なものが好ましく、ポリエチレン、ポリプロピレン、ポリスチレン、アクリル樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリカーボネート、スチレンアクリロニトリル共重合体などのフィルム、またはこれらを積層したフィルムが挙げられる。さらに、接合可能な紙をフィルムとして用いることもできる。 The film used for the film 12 is preferably one that can be ultrasonically bonded, and may be a film made of polyethylene, polypropylene, polystyrene, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polycarbonate, styrene-acrylonitrile copolymer, or a laminate of these. Examples include films that Furthermore, bondable papers can also be used as films.
　フィルム１２の厚さは、15μｍ以上150μｍ以下であることが好ましく、20μｍ以上100μｍ以下がより好ましい。フィルムの厚さが15μｍ未満の場合、袋体の強度が不充分になるおそれがあり、150μｍを超えるとコスト上、不利になる場合がある。 The thickness of the film 12 is preferably 15 μm or more and 150 μm or less, more preferably 20 μm or more and 100 μm or less. If the film thickness is less than 15 μm, the strength of the bag may be insufficient, and if it exceeds 150 μm, it may be disadvantageous in terms of cost.
　フィルムは、透明であっても不透明であってもよいが、日光による内容物の劣化を防止するため不透明な包装フィルムを用いることが好ましい。また、意匠性を高めるために表面に印刷を施したフィルムでもよい。 The film may be transparent or opaque, but it is preferable to use an opaque packaging film to prevent the contents from deteriorating due to sunlight. It may also be a film whose surface is printed to enhance its design.
　本実施形態の袋体１０では、袋体１０の上端に沿って延びるトップシール部１４を部分的に途切れさせることによって、トップシール部１４の一部に弱化部２０が一つ、設けられている。この弱化部２０は、トップシール部１４の他の部分より、フィルム１２間の単位面積あたりの剥離強度が低くされ、トップシール部１４の他の部分より低い力でフィルム同士が剥離するように構成されている。 In the bag 10 of this embodiment, one weakened part 20 is provided in a part of the top seal part 14 by partially cutting off the top seal part 14 extending along the upper end of the bag 10. . This weakened portion 20 has a lower peel strength per unit area between the films 12 than other portions of the top seal portion 14, and is configured such that the films are peeled off with a lower force than other portions of the top seal portion 14. has been done.
　弱化部２０は、袋体１０の内部から外部に向う方向にトップシール部１４を横断して延びるように設けられているので、接合されていたフィルム１２が弱化部２０で剥離することにより、袋体１０の内部と外部とを連通させるガス抜き通路が形成される。 The weakened portion 20 is provided to extend across the top seal portion 14 from the inside to the outside of the bag body 10, so that when the bonded film 12 is peeled off at the weakened portion 20, the bag A gas vent passage is formed that communicates the inside and outside of the body 10.
　この結果、弱化部２０は、冷凍食品を密封状態で収容した袋体１０を電子レンジにいれて加熱した際、食品等が発生させた水蒸気等によって生じる内部圧力で、フィルム１２同士が剥離し、トップシール部１４に袋体１０の内部と外部とを連通させるガス抜き通路を形成することになる。 As a result, when the bag 10 containing the frozen food in a sealed state is placed in a microwave oven and heated, the weakened portion 20 causes the films 12 to separate from each other due to internal pressure generated by water vapor generated by the food, etc. A degassing passage that communicates the inside and outside of the bag 10 is formed in the top seal portion 14.
　本実施態様の袋体１０では、トップシール部１４に、１つの弱化部２０が設けられているが、本発明の袋体は、少なくとも一つのシール部に少なくとも１つの弱化部が設けられていれば良い。また、トップシール部１４とボトムシール部１６のそれぞれに、一つずつの弱化部２０が設けた構成でもよい。
　弱化部の数、配置場所は、電子レンジ等による加熱時にどの程度の内部圧力が発生するか等々の条件を勘案して適宜、決定される。 In the bag 10 of this embodiment, one weakened part 20 is provided in the top seal part 14, but in the bag of the present invention, at least one weakened part is provided in at least one seal part. Good. Alternatively, a configuration may be adopted in which each of the top seal portion 14 and the bottom seal portion 16 is provided with one weakened portion 20.
The number and location of the weakened parts are determined as appropriate, taking into consideration conditions such as how much internal pressure is generated during heating with a microwave oven or the like.
　弱化部２０が形成されるトップシール部１４の幅(袋体１０の内外方向の長さ)は0.2ｍｍ以上20ｍｍ以下が好ましく、0.3ｍｍ以上10ｍｍ以下がさらに好ましい。0.2ｍｍ未満になると接合強度が不足する場合があり、20ｍｍを超えると意匠上、加工上、望ましくない場合がある。 The width of the top seal portion 14 in which the weakened portion 20 is formed (the length in the inner and outer directions of the bag body 10) is preferably 0.2 mm or more and 20 mm or less, and more preferably 0.3 mm or more and 10 mm or less. If it is less than 0.2 mm, the bonding strength may be insufficient, and if it exceeds 20 mm, it may be undesirable in terms of design or processing.
　弱化部２０が形成されるトップシール部１４の弱化部２０と隣接する先端部２２は、シール部の他の部分よりも接合強度を高くしてもよい。接合強度を高める方法としては、例えば、弱化部２０と隣接するトップシール部１４の先端部２２の幅(図１のＸ方向の長さ)を、トップシール部１４の他の部分の幅より、1.3～５倍、より好ましくは1.5～３倍にする構成がある。このような構成よって、弱化部が剥離する際に、隣接するトップシール部１４が弱化部２０の剥離に引きずられて剥離する等の不具合を防止できる。 The tip portion 22 of the top seal portion 14 adjacent to the weakened portion 20, where the weakened portion 20 is formed, may have a higher bonding strength than other portions of the seal portion. As a method for increasing the bonding strength, for example, the width of the tip portion 22 of the top seal portion 14 adjacent to the weakened portion 20 (the length in the X direction in FIG. 1) is set to be larger than the width of other portions of the top seal portion 14. There is a configuration that increases the amount by 1.3 to 5 times, more preferably 1.5 to 3 times. With such a configuration, it is possible to prevent problems such as when the weakened portion peels off, the adjacent top seal portion 14 is dragged by the peeled off of the weakened portion 20 and peels off.
　次に、弱化部の構成について説明する。図２は、弱化部２０の具体的構成を説明するための模式的な図面である。
　上述のように弱化部２０は、電子レンジ等での加熱によって、袋体１０内で水蒸気等が発生して圧力が上昇すると、接続されていたフィルム１２が剥離して、排気通路を形成する機能を備えている。このような機能を発揮するため、弱化部２０は、袋体の内側(本実施態様では、最も内側)に位置する部分の剥離強度が弱化部の他の部分の剥離強度より低くなるように構成されている。 Next, the configuration of the weakening section will be explained. FIG. 2 is a schematic drawing for explaining the specific configuration of the weakening section 20. As shown in FIG.
As described above, the weakened portion 20 has a function of forming an exhaust passage by peeling off the connected film 12 when water vapor or the like is generated within the bag body 10 and the pressure increases due to heating in a microwave oven or the like. It is equipped with In order to exhibit such a function, the weakened portion 20 is configured such that the peel strength of the portion located inside the bag (in this embodiment, the innermost portion) is lower than the peel strength of other portions of the weakened portion. has been done.
　本実施形態の袋体１０の弱化部２０は、トップシール部１４をシールの幅方向(袋体１０の内部から外部に向かう方向)に横断するように延びている。そして、弱化部２０では、重ねられた２枚のフィルム１２が、２枚のフィルム１２を点状に接合している複数のドット状接合部２４によってのみ接続されている。この複数のドット状接合部２４が、トップシール部１４の幅方向(図１のＸ方向)に袋体１０の内部から外部に向かって、弱化部２０の幅方向(図１のＹ方向)の配置数が増加するように、弱化部２０の全幅(図１のＹ方向全長)にわたって分布して配置されている。 The weakened portion 20 of the bag 10 of this embodiment extends across the top seal portion 14 in the seal width direction (direction from the inside to the outside of the bag 10). In the weakened portion 20, the two stacked films 12 are connected only by a plurality of dot-like joints 24 that join the two films 12 in a dotted manner. The plurality of dot-like joints 24 extend from the inside of the bag 10 to the outside in the width direction of the top seal part 14 (X direction in FIG. 1), and in the width direction (Y direction in FIG. 1) of the weakened part 20. They are distributed over the entire width of the weakened portion 20 (the entire length in the Y direction in FIG. 1) so that the number of the weakened portions 20 increases.
　本実施態様では、弱化部２０のＹ方向の長さ(幅)は、10ｍｍ以上60ｍｍ以下に設定されている。弱化部２０の長さ(幅)が10ｍ未満の場合、発生した水蒸気等を充分に排出できないことがあり、60ｍｍを超えると完全に水蒸気排出部の剥離が不充分になることがある。
　弱化部２０のＹ方向の長さ(幅)は、12ｍｍ以上45ｍｍ以下がより好ましく、15ｍｍ以上50ｍｍ以下が更に好ましい。 In this embodiment, the length (width) of the weakened portion 20 in the Y direction is set to 10 mm or more and 60 mm or less. If the length (width) of the weakened part 20 is less than 10 m, it may not be possible to sufficiently discharge the generated water vapor, and if it exceeds 60 mm, the water vapor discharge part may not be completely peeled off.
The length (width) of the weakened portion 20 in the Y direction is more preferably 12 mm or more and 45 mm or less, and even more preferably 15 mm or more and 50 mm or less.
　図２は、図１の袋体１０の弱化部２０を拡大して示す模式図である。
　図１および図２に示すように、本実施態様の袋体１０の弱化部２０では、複数のドット状接合部２４が、弱化部２０内で、袋体１０の内部から外部に向かって広がる略Ｖ字状に配置されている。各ドット状接合部２４は、同一の寸法の円形のドッド形状を有し、重ね合わされたフィルム１２を互いに接合している。 FIG. 2 is an enlarged schematic diagram showing the weakened portion 20 of the bag 10 of FIG. 1. As shown in FIG.
As shown in FIGS. 1 and 2, in the weakened portion 20 of the bag 10 of this embodiment, the plurality of dot-shaped joints 24 approximately expand from the inside of the bag 10 toward the outside within the weakened portion 20. They are arranged in a V-shape. Each dot-shaped joint 24 has a circular dot shape with the same dimensions, and joins the stacked films 12 to each other.
　上述したように、複数のドット状接合部２４は、弱化部２０の袋体１０の最も内側に位置する部分の剥離強度が弱化部２０の他の部分の剥離強度より低くなるように配置されている。具体的には、ドット状接合部２４は、図１および図２に示すように、弱化部２０の幅方向(Y方向)に並ぶドット状接合部２４の複数本の列を形成し、この複数本の列が、袋体１０の内部から外部に向かって並べられた状態に配置されている。 As described above, the plurality of dot-like joints 24 are arranged such that the peel strength of the weakened portion 20 located at the innermost portion of the bag body 10 is lower than the peel strength of other portions of the weakened portion 20. There is. Specifically, as shown in FIGS. 1 and 2, the dot-like joints 24 form a plurality of rows of dot-like joints 24 lined up in the width direction (Y direction) of the weakened portion 20. Rows of books are arranged from the inside of the bag 10 to the outside.
　複数本の列の各列を構成するドット状接合部の数は、弱化部２０の袋体内方側部分においては、袋体の内部から外部に向かって(矢印X方向に沿って)増加している。さらに、複数本の列の各列を構成するドット状接合部２４は、袋体の内部から外部にいくにつれて、弱化部２０の幅方向外方に位置するように配置されている。
　この結果、本実施態様の袋体１０の弱化部２０では、図１および図２に示すように、複数のドット状接合部２４は、複数のドット状接合部２４によって覆われる領域の袋体１０の内部空間に面する部分が袋体１０の内部側に向かって先細りするように配置されることになる。さらに、複数のドット状接合部２４は、図１および図２に示すように、複数のドット状接合部２４によって覆われる領域が袋体１０の内部側に向かって先細りする全体で略V字状をなすように配置されている。 The number of dot-like joints constituting each of the plurality of rows increases from the inside of the bag to the outside (along the direction of arrow X) in the inside part of the bag body of the weakened part 20. There is. Furthermore, the dot-like joints 24 constituting each of the plurality of rows are arranged so as to be located outward in the width direction of the weakened portion 20 as they go from the inside of the bag to the outside.
As a result, in the weakened portion 20 of the bag 10 of this embodiment, as shown in FIGS. The bag 10 is arranged so that the portion facing the internal space tapers toward the inside of the bag 10. Further, as shown in FIGS. 1 and 2, the plurality of dot-like joints 24 have a generally V-shaped overall shape, with the area covered by the plurality of dot-like joints 24 tapering toward the inside of the bag body 10. It is arranged so that it forms.
　このように構成された袋体１０には、例えば、トレイ２６に載せられた調理済冷凍食品(例えば、冷凍シュウマイ)が封入されることになる。 For example, a cooked frozen food (for example, frozen shumai) placed on the tray 26 is sealed in the bag 10 configured in this manner.
　ドット状接合部２４の配置を更に具体的に説明する。
　図２に示されているように、本実施形態の袋体１０では、複数のドット状接合部２４は、弱化部２０の幅方向(図１の矢印Ｙ方向)に列状に配列され、この列が、袋体１０の内部側から外部側に向けて、第１列ないし第６列として、６列、配置されている。 The arrangement of the dot-like joints 24 will be explained in more detail.
As shown in FIG. 2, in the bag 10 of this embodiment, the plurality of dot-like joints 24 are arranged in a row in the width direction of the weakened portion 20 (direction of arrow Y in FIG. 1). Six rows are arranged from the inside to the outside of the bag body 10 as the first to sixth rows.
　第１列は、１個のドット状接合部２４によって構成され、この１個のドット状接合部２４が、弱化部２０の幅方向(Ｙ方向)中央の最も袋体１０の内部側位置に配置されている。 The first row is composed of one dot-like joint 24, and this one dot-like joint 24 is arranged at the innermost position of the bag body 10 at the center of the weakened part 20 in the width direction (Y direction). has been done.
　第２列は、等間隔に配置された４個のドット状接合部２４によって構成され、この４個のドット状接合部２４が、弱化部２０の幅方向(Ｙ方向)中央位置で第１列の(袋体)外側に配置されている。尚、第２列は、第２列を構成するドット状接合部２４のうちの中央部の２個が、Ｘ方向において第１列のドット状接合部２４とオフセットするように構成されている。
　この結果、第１列のドット状接合部２４は、弱化部２０における幅方向(Ｙ方向)位置が、袋体１０の外側方向に隣接し第２列の中央で弱化部２０の幅方向に並んだ２個のドット状接合部２４、２４の中間位置とＸ方向に整列するように配置されることになる。 The second row is composed of four dot-like joints 24 arranged at equal intervals, and these four dot-like joints 24 are arranged in the first row at the center position of the weakened part 20 in the width direction (Y direction). It is placed on the outside of the (bag body). Note that the second row is configured such that two central portions of the dot-like joints 24 constituting the second row are offset from the dot-like joints 24 of the first row in the X direction.
As a result, the dot-shaped joints 24 in the first row are arranged so that the positions in the width direction (Y direction) of the weakened portion 20 are adjacent to the outer side of the bag body 10 and lined up in the width direction of the weakened portion 20 at the center of the second row. It is arranged so as to be aligned in the X direction with the middle position of the two dot- like joints 24, 24.
　第３列は、等間隔に配置された５個のドット状接合部２４によって構成され、この５個のドット状接合部２４が、弱化部２０の幅方向(Ｙ方向)中央位置で第２列の外側に配置されている。
　尚、第３列は、各ドット状接合部２４が、Ｘ方向において第２列のドット状接合部２４とオフセットするように構成されている。
　この結果、第２列のドット状接合部２４は、弱化部２０における幅方向(Ｙ方向)位置が、袋体１０の外側方向に隣接し第３列内で弱化部２０の幅方向に並んだ２個のドット状接合部２４、２４の中間位置とＸ方向に整列するように配置されることになる。 The third row is composed of five dot-like joints 24 arranged at equal intervals, and these five dot-like joints 24 are arranged in the second row at the center position of the weakened part 20 in the width direction (Y direction). is placed outside.
Note that the third row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the second row in the X direction.
As a result, the dot-like joints 24 in the second row are arranged so that the width direction (Y direction) positions of the weakened portions 20 are adjacent to the outer side of the bag body 10 and lined up in the width direction of the weakened portions 20 in the third row. It is arranged so as to be aligned in the X direction with the middle position of the two dot- like joints 24, 24.
　第４列は、等間隔に配置された８個のドット状接合部２４によって構成され、この８個のドット状接合部２４が、弱化部２０の幅方向(Ｙ方向)中央位置で第３列の外側に配置されている。
　尚、第４列は、各ドット状接合部２４が、Ｘ方向において第３列のドット状接合部２４とオフセットするように構成されている。
　この結果、第３列のドット状接合部２４は、弱化部２０における幅方向(Ｙ方向)位置が、袋体１０の外側方向に隣接し第４列内で弱化部２０の幅方向に並んだ２個のドット状接合部２４、２４の中間位置とＸ方向に整列するように配置されることになる。 The fourth row is composed of eight dot-like joints 24 arranged at equal intervals, and these eight dot-like joints 24 are arranged in the third row at the center position of the weakened part 20 in the width direction (Y direction). is placed outside.
Note that the fourth row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the third row in the X direction.
As a result, the dot-like joints 24 in the third row are arranged so that the positions in the width direction (Y direction) of the weakened portions 20 are adjacent to the outer side of the bag body 10 and lined up in the width direction of the weakened portions 20 in the fourth row. It is arranged so as to be aligned in the X direction with the middle position of the two dot- like joints 24, 24.
　第５列は、等間隔に配置された４個のドット状接合部２４の２つのセットによって構成され、各セットが、外側の２つのドット状接合部２４が第４列のドット状接合部２４より幅方向外方側に位置するように、第４列の外側に配置されている。
　尚、第５列は、各ドット状接合部２４が、Ｘ方向において第４列のドット状接合部２４とオフセットするように構成されている。
　この結果、第４列の外側２つのドット状接合部２４は、弱化部２０における幅方向(Ｙ方向)位置が、袋体１０の外側方向に隣接し第５列内で弱化部２０の幅方向に並んだ２個のドット状接合部２４、２４の中間位置とＸ方向に整列するように配置されることになる。 The fifth row is constituted by two sets of four dot-like joints 24 arranged at equal intervals, each set including the outer two dot-like joints 24 of the fourth row of dot-like joints 24. It is arranged outside the fourth row so as to be located further outward in the width direction.
Note that the fifth row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the fourth row in the X direction.
As a result, the two outer dot-like joints 24 in the fourth row are located adjacent to each other in the width direction (Y direction) of the weakened portion 20 in the outer direction of the bag body 10 and in the width direction of the weakened portion 20 in the fifth row. It is arranged so as to be aligned in the X direction with the middle position of the two dot- like joints 24, 24 lined up.
　第６列は、等間隔に配置された３個のドット状接合部２４の２つのセットによって構成され、各セットが、外側の１つのドット状接合部２４が第５列のドット状接合部２４より幅方向外方側に位置する幅方向位置で、第５列の外側に配置されている。
　尚、第６列は、各ドット状接合部２４が、Ｘ方向において第５列のドット状接合部２４とオフセットするように構成されている。
　この結果、第５列の外側２つのドット状接合部２４は、弱化部２０における幅方向(Ｙ方向)位置が、袋体１０の外側方向に隣接し第６列内で弱化部２０の幅方向に並んだ２個のドット状接合部２４、２４の中間位置とＸ方向に整列するように配置されることになる。 The sixth row is constituted by two sets of three equally spaced dot-like joints 24, each set having one outer dot-like joint 24 connected to the fifth row of dot-like joints 24. It is arranged at a widthwise position located further outward in the widthwise direction and outside of the fifth row.
Note that the sixth row is configured such that each dot-like joint 24 is offset from the dot-like joint 24 of the fifth row in the X direction.
As a result, the two outer dot-shaped joints 24 in the fifth row are located adjacent to each other in the width direction (Y direction) of the weakened portion 20 in the outer direction of the bag body 10 and in the width direction of the weakened portion 20 in the sixth row. It is arranged so as to be aligned in the X direction with the middle position of the two dot- like joints 24, 24 lined up.
　このような構成によって、弱化部２０の袋体１０の内側に位置する部分である第１列の剥離強度(重ね合わされたフィルム間の剥離強度)が弱化部２０の他の部分の剥離強度より低くなる。 With this configuration, the peel strength of the first row (peel strength between stacked films), which is the portion of the weakened portion 20 located inside the bag body 10, is lower than the peel strength of other portions of the weakened portion 20. Become.
　このような構成によれば、シール部の袋体の最も内側に位置する部分が剥離し始めると、この剥離が他の部分に伝搬して容易に剥離が進むことになる。そして、弱化部の袋体の最も内側に位置する部分の剥離強度を低く設定すれば他の部分の剥離強度を高く設定しても必要な剥離を得ることができるため、弱化部の最も内側に位置する部分以外の部分の剥離強度をある程度高く設定することができ、輸送中や保存中の剥離防止が可能になる。この結果、弱化部の確実な剥離と輸送中や保存中の剥離防止の両立が可能となる。 According to such a configuration, when the innermost portion of the bag body of the seal portion begins to peel off, this peeling propagates to other parts and the peeling progresses easily. If the peel strength of the innermost part of the weakened part of the bag is set low, the necessary peeling can be obtained even if the peel strength of other parts is set high. It is possible to set the peel strength of the portions other than the positioned portions to be high to a certain extent, making it possible to prevent peeling during transportation or storage. As a result, it is possible to both reliably peel off the weakened portion and prevent peeling during transportation and storage.
　本実施態様の袋体１０では、同一列内で隣接するドット状接合部２４間の距離(Ｙ方向距離)は0.5ｍｍ以上２ｍｍ以下に設定されている。この距離を0.5ｍｍ以上２ｍｍ以下の範囲とすることで、電子レンジで加熱した時の剥離性と異物の侵入防止を両立することができる。この距離は、0.8ｍｍ以上1.85ｍｍ以下がより好ましく、１ｍｍ以上1.7ｍｍ以下がさらに好ましい。 In the bag 10 of this embodiment, the distance (Y-direction distance) between adjacent dot-like joints 24 in the same row is set to 0.5 mm or more and 2 mm or less. By setting this distance in the range of 0.5 mm or more and 2 mm or less, it is possible to achieve both removability when heated in a microwave oven and prevention of foreign matter from entering. This distance is more preferably 0.8 mm or more and 1.85 mm or less, and even more preferably 1 mm or more and 1.7 mm or less.
　また、本実施態様の袋体１０では、ドット状接合部２４の各列間の距離は、0.5ｍｍ以上1.5ｍｍ以下に設定されている。この距離を0.5ｍｍ以上２ｍｍ以下の範囲とすることで、電子レンジで加熱した時の剥離性と異物の侵入防止を両立することができる。この距離は、0.55ｍｍ以上1.2ｍｍ以下がより好ましく、0.6ｍｍ以上1.0ｍｍ以下がさらに好ましい。 Furthermore, in the bag 10 of this embodiment, the distance between each row of the dot-like joints 24 is set to 0.5 mm or more and 1.5 mm or less. By setting this distance in the range of 0.5 mm or more and 2 mm or less, it is possible to achieve both removability when heated in a microwave oven and prevention of foreign matter from entering. This distance is more preferably 0.55 mm or more and 1.2 mm or less, and even more preferably 0.6 mm or more and 1.0 mm or less.
　さらに、隣接する列間のドット状接合部２４が、Ｙ方向にオフセットする千鳥状の配置によって、外部からの異物の侵入を効果的に防止することができる。 Further, by arranging the dot-like joints 24 between adjacent rows in a staggered manner offset in the Y direction, it is possible to effectively prevent foreign matter from entering from the outside.
　本実施態様の袋体１０では、各ドット状接合部の形状には、円形とされているが、特に制限はなく、正方形、不定形などでもよい。
　本実施態様の袋体１０では、円形の各ドット状接合部２４の寸法(直径)は、0.1ｍｍ以上１ｍｍ以下に設定されている。ドット状接合部２４の寸法0.1ｍｍ未満の場合、弱化部２０の強度が不充分になる場合があり、１ｍｍを超えると水蒸気の排出が不充分になる場合があるためである。また、この寸法は、0.15ｍｍ以上0.58ｍｍ以下がより好ましく、0.2ｍｍ以上0.6ｍｍ以下がさらに好ましい。尚、上記寸法は、ドット状接合部が、正方形の場合は対角線の長さ、不定形の場合は外接する円の中で最小のものの直径となる。 In the bag 10 of this embodiment, the shape of each dot-like joint is circular, but there is no particular restriction on the shape, and it may be square, irregular shape, or the like.
In the bag 10 of this embodiment, the size (diameter) of each circular dot-shaped joint 24 is set to 0.1 mm or more and 1 mm or less. This is because if the size of the dot-shaped joint portion 24 is less than 0.1 mm, the strength of the weakened portion 20 may become insufficient, and if it exceeds 1 mm, the discharge of water vapor may become insufficient. Moreover, this dimension is more preferably 0.15 mm or more and 0.58 mm or less, and even more preferably 0.2 mm or more and 0.6 mm or less. The above dimensions are the length of the diagonal line if the dot-shaped joint is square, and the diameter of the smallest circumscribed circle if the dot-shaped joint is amorphous.
　上記実施形態の袋体１０の弱化部２０では、全てのドット状接合部２４が同一の寸法形状である。しかしながら、本発明は、これに限定されるものではなく、各ドット状接合部の大きさはすべて同じである必要はない。特に、第１列のドット状接合部の大きさを、後列のドット状接合部の大きさより小さくすることによって、電子レンジで加熱した時の剥離がさらに容易になる効果が得られる。 In the weakened portion 20 of the bag body 10 of the above embodiment, all the dot-shaped joint portions 24 have the same size and shape. However, the present invention is not limited to this, and the sizes of the dot-like joints do not all need to be the same. In particular, by making the size of the dot-like joints in the first row smaller than the size of the dot-like joints in the rear row, it is possible to obtain the effect that peeling becomes easier when heated in a microwave oven.
　弱化部におけるドッド状接合部２４の数、配列は、上記実施形態に限定されるものではなく、例えば、図３、４に示されてるような配置でもよい。 The number and arrangement of the dot-shaped joints 24 in the weakened portion are not limited to the above embodiments, and may be arranged as shown in FIGS. 3 and 4, for example.
　ドット状接合部２４の列の数は、上記実施形態の袋体１０では６列であるが、２列以上１０列以下が好ましい。ドット状接合部の列の数を２列以上とすることで輸送中や保存中に落下したり振動を与えられたりしたときに弱化部が剥離することが抑制され、１０列以下とすることで、電子レンジで加熱した時の剥離が容易になる。ドット状接合部の列の数は、３列以上８列以下がより好ましく、４列以上６列以下がさらに好ましい。 The number of rows of the dot-like joints 24 is six in the bag 10 of the above embodiment, but preferably 2 or more and 10 or less. By having two or more rows of dot-like joints, it is possible to prevent the weakened parts from peeling off when the product is dropped or subjected to vibration during transportation or storage, and by having no more than 10 rows, , peeling becomes easier when heated in a microwave oven. The number of rows of dot-like joints is more preferably 3 or more and 8 or less, and even more preferably 4 or more and 6 or less.
　各列のドットの数は、１つ以上１６以下が好ましく、１つ以上１２以下がより好ましい。
　各列のドットの数には特に制限はないが、第１列のドットの数は他の列のドット数よりも少ないことが必要である。第１列のドット数を他の列のドット数より少なくすることで、電子レンジで加熱した時の剥離がより容易になる。 The number of dots in each row is preferably 1 or more and 16 or less, more preferably 1 or more and 12 or less.
Although there is no particular restriction on the number of dots in each column, it is necessary that the number of dots in the first column is smaller than the number of dots in the other columns. By making the number of dots in the first row smaller than the number of dots in the other rows, it becomes easier to peel off when heated in a microwave oven.
　具体的には、第１列中のドット状接合部の数は１つ以上５つ以下が好ましく、１つ以上４つ以下がより好ましく、１つ以上３つ以下がさらに好ましい。 Specifically, the number of dot-like joints in the first row is preferably from 1 to 5, more preferably from 1 to 4, and even more preferably from 1 to 3.
　第２列以降の列中のドット状接合部の数は、特に制限はないが、２つ以上１６以下が好ましく、３つ以上１２以下がより好ましく、４つ以上８つ以下がさらに好ましい。 The number of dot-like joints in the second and subsequent rows is not particularly limited, but is preferably 2 or more and 16 or less, more preferably 3 or more and 12 or less, and even more preferably 4 or more and 8 or less.
　ドット状接合部をこのように配置することで、輸送中や保存中に落下したり振動を与えられたりしたときに弱化部が剥離することが抑制され、１０列以下とすることで、電子レンジで加熱した時の剥離が容易になる。 By arranging the dot-shaped joints in this way, the weakened parts are prevented from peeling off when dropped or subjected to vibration during transportation or storage, and by arranging the dot-shaped joints in 10 rows or less, Peeling becomes easier when heated.
　ドット状接合部は、必ずしも、列状に配置される必要はなく、弱化部の袋体の内部側に位置する部分の剥離強度が弱化部の他の部分の剥離強度より低くなるように、例えば、複数のドット状接合部によって覆われる領域の袋体の内部空間に面する部分が袋体の内部側に向かって先細りするように、弱化部の全幅にわたって配置されていればよい。 The dot-like joints do not necessarily have to be arranged in a row, and may be arranged so that the peel strength of the weakened part located on the inside of the bag is lower than that of other parts of the weakened part, for example. The weakened portion may be arranged over the entire width of the weakened portion so that the portion of the area covered by the plurality of dot-shaped joints facing the internal space of the bag tapers toward the inside of the bag.
　次に、本実施態様の袋体の製造方法について説明する。まず、袋体の製造(シール部の形成)に使用する超音波接合機の構成について説明する。 Next, a method for manufacturing the bag according to this embodiment will be explained. First, the configuration of the ultrasonic bonding machine used for manufacturing the bag (forming the seal portion) will be explained.
　袋体１０のシール部の形成には、超音波接合機が使用されるのが好ましい。
　図５は、超音波接合機で使用される超音波接合機の構成を示す模式的な図である。超音波接合機５０は、５０Ｈｚまたは６０Ｈｚの商用電気を１５～７０ＫＨｚ程度の高周波信号に変換する超音波発振機５２と、この信号を機械的振動に変換するコンバータ５４と、この機械的振動を増幅するブースター５６と、増幅された振動を溶着対象に伝える平板状のホーン５８、ホーン５８との間で２枚にフィルム１２、１２を挟持する平板状アンビル６０等を備えている公知の基本構成を有する超音波接合機である。 Preferably, an ultrasonic bonding machine is used to form the seal portion of the bag body 10.
FIG. 5 is a schematic diagram showing the configuration of an ultrasonic bonding machine used in the ultrasonic bonding machine. The ultrasonic bonding machine 50 includes an ultrasonic oscillator 52 that converts commercial electricity of 50 Hz or 60 Hz into a high frequency signal of approximately 15 to 70 KHz, a converter 54 that converts this signal into mechanical vibration, and a converter that amplifies this mechanical vibration. A known basic configuration includes a booster 56 that transmits amplified vibrations to the welding target, a flat horn 58 that transmits amplified vibrations to the welding target, and a flat anvil 60 that sandwiches the films 12, 12 between the horn 58. This is an ultrasonic bonding machine with
　本実施形態の袋体の製造に用いられるホーン５８は平滑な表面を有し、アンビル６０は後述のようにドット状接合部２４に対応する凸部を有する表面を有している。 The horn 58 used to manufacture the bag of this embodiment has a smooth surface, and the anvil 60 has a surface with convex portions corresponding to the dot-like joints 24 as described later.
　ホーン５８とアンビル６０の長さは、50ｍｍないし450ｍｍ程度である、またホーン５８とアンビル６０の幅は、７ｍｍないし25ｍｍ程度である。ホーン５８とアンビル６０は、公知の素材、特にステンレスやチタン合金で形成されるのが好ましい。 The length of the horn 58 and the anvil 60 is about 50 mm to 450 mm, and the width of the horn 58 and the anvil 60 is about 7 mm to 25 mm. Horn 58 and anvil 60 are preferably made of known materials, particularly stainless steel or titanium alloy.
　ホーン５８とアンビル６０の表面の縁部を面取りしてもよい。面取りをすることでこの部分でフィルム１２が切れてしまうことを防止することができる。 The edges of the surfaces of the horn 58 and anvil 60 may be chamfered. By chamfering, it is possible to prevent the film 12 from being cut at this portion.
　アンビル６０は図示しない駆動装置により上下動してホーン５８との間で２枚のフィルム１２を挟持する。この状態でホーン５８に超音波を印加して袋体にトップシール部１４と弱化部２０を同時に形成する。２枚のフィルム１２、１２を挟持する際、ホーン５８とアンビル６０の間には図示しない加圧装置により20Ｎから500Ｎ程度の圧力がかけられる。 The anvil 60 is moved up and down by a drive device (not shown) to sandwich the two films 12 between it and the horn 58. In this state, ultrasonic waves are applied to the horn 58 to simultaneously form the top seal portion 14 and the weakened portion 20 on the bag body. When sandwiching the two films 12, 12, a pressure of about 20N to 500N is applied between the horn 58 and the anvil 60 by a pressure device (not shown).
　接合時間は、0.01秒以上10秒以下程度が好ましいが、0.03秒以上５秒以下がより好ましく0.05秒以上３秒以下が更に好ましい。接合時間を、0.01以上とすることで、充分な接合強度を得ることが可能になる。また、接合時間を10秒以下とすることで効率よい製造が可能になる。 The bonding time is preferably about 0.01 seconds or more and 10 seconds or less, more preferably 0.03 seconds or more and 5 seconds or less, and even more preferably 0.05 seconds or more and 3 seconds or less. By setting the bonding time to 0.01 or more, it becomes possible to obtain sufficient bonding strength. Furthermore, by reducing the bonding time to 10 seconds or less, efficient manufacturing becomes possible.
　図６は、超音波接合機５０で使用されるアンビル６０の構成を模式的に示す斜視図である。アンビル６０は、平板型で、表面６２には、袋体１０のトップシール部１４に対応する矩形状の凸部７４、７４と、ドット状接合部２４に対応する複数の突起７６が配置されている。 FIG. 6 is a perspective view schematically showing the configuration of an anvil 60 used in the ultrasonic bonding machine 50. The anvil 60 is of a flat plate type, and has rectangular convex portions 74, 74 corresponding to the top seal portion 14 of the bag body 10 and a plurality of protrusions 76 corresponding to the dot-shaped joint portions 24 arranged on the surface 62. There is.
　凸部７４、７４と突起７６の寸法形状、配置は、袋体１０のトップシール部１４とドット状接合部２４の寸法形状、配置と相補的に設定される。
　凸部７４、７４と突起７６の高さは、0.2ｍｍ以上1.0ｍｍ以下に設定されている。凸部７４、７４と突起７６の高さが0.2ｍｍ未満であるとトップシール部１４およびドット状接合部２４の接合強度が不充分になる場合があり、1.0ｍｍを超えると縁部でフィルムが切れて、うまく接合できない場合があるためである。
　凸部７４、７４と突起７６の高さは、0.25ｍｍ以上0.8ｍｍ以下がより好ましく、0.3ｍｍ以上0.5ｍｍ以下が更に好ましい。 The dimensions, shape, and arrangement of the convex portions 74, 74 and the protrusion 76 are set to be complementary to the dimensions, shape, and arrangement of the top seal portion 14 and dot-shaped joint portion 24 of the bag body 10.
The heights of the convex portions 74, 74 and the protrusion 76 are set to 0.2 mm or more and 1.0 mm or less. If the height of the convex parts 74, 74 and the protrusion 76 is less than 0.2 mm, the bonding strength between the top seal part 14 and the dot-shaped joint part 24 may be insufficient, and if it exceeds 1.0 mm, the film may be damaged at the edges. This is because it may break and fail to join properly.
The height of the convex portions 74, 74 and the protrusion 76 is more preferably 0.25 mm or more and 0.8 mm or less, and even more preferably 0.3 mm or more and 0.5 mm or less.
　凸部７４、７４と突起７６の断面形状は、長方形、かまぼこ型、台形が好ましいが、縁部でフィルムが切れてしまうことを防止する観点から、かまぼこ型、台形状が特に好ましい。 The cross-sectional shapes of the protrusions 74, 74 and the protrusions 76 are preferably rectangular, semicircular, or trapezoidal, but semicircular or trapezoidal are particularly preferable from the viewpoint of preventing the film from being cut at the edges.
　次に本発明の好ましい実施形態の冷凍食品保存用袋体と冷凍食品の製造方法について説明する。
　本発明の好ましい実施形態の冷凍食品保存用袋体と冷凍食品は例えば次のような方法で製造することができる。
(１)フィルムを準備する。
(２)このフィルムを２つに折り、ヒートシール接合または超音波接合してサイドシール部を形成する。
(３)さらに、ボトムシール部を形成する。
(４)以上の方法で袋体冷凍食品保存用袋体を形成する。
(５)形成した袋体冷凍食品保存用袋体に冷凍食品を収納する。
(６)続いて表面に弱化部に対応する凹凸を有する平板型アンビルと、平滑な表面を持つ平板型ホーンを有する超音波接合機で接合して、弱化部を有するトップシール部を形成する。
　このようにして、トップシール部に弱化部を有する袋体冷凍食品保存用袋体に収納された冷凍食品が製造される。本発明の冷凍食品保存用袋体と冷凍食品の製造方法はこれに限定されるものではなく、例えば水蒸気排出部の数や、これを設ける位置は必要に応じて変更できる。 Next, a frozen food storage bag and a method for manufacturing a frozen food according to a preferred embodiment of the present invention will be described.
The frozen food storage bag and frozen food according to a preferred embodiment of the present invention can be manufactured, for example, by the following method.
(1) Prepare the film.
(2) This film is folded in two and heat-sealed or ultrasonically bonded to form side seals.
(3) Furthermore, a bottom seal portion is formed.
(4) A bag for storing frozen food is formed by the above method.
(5) Store the frozen food in the formed bag for storing frozen food.
(6) Next, a flat anvil having a surface with irregularities corresponding to the weakened portion is joined with an ultrasonic welding machine having a flat horn with a smooth surface to form a top seal portion having a weakened portion.
In this way, a frozen food stored in a bag for storing frozen food having a weakened portion in the top seal portion is manufactured. The frozen food storage bag and the method for manufacturing frozen food of the present invention are not limited to this, and for example, the number of water vapor discharge sections and the positions where they are provided can be changed as necessary.
　さらに予め、長いフィルムを用いてサイドシールのみが形成された袋体が縦に多数連結されたものを作成しておき、これを用いて複数の冷凍食品を連続して作成することも可能である。この場合、上記の(１)と(２)は１回の工程で行い、(３)から(６)の工程を繰り返すことになる。
　さらに変形例として、袋体のトップシール部と隣接する袋体のポトムシール部を同時に形成して、その後２つの袋体を切り離す方法もある。この場合、(６)および次の袋体への(３)が同時に行なわれることになる。 Furthermore, it is also possible to create in advance a large number of vertically connected bags with only side seals formed using a long film, and use this to create multiple frozen foods in succession. . In this case, steps (1) and (2) above are performed in one step, and steps (3) to (6) are repeated.
Furthermore, as a modification, there is a method in which the top seal portion of a bag body and the bottom seal portion of an adjacent bag body are formed at the same time, and then the two bags are separated. In this case, (6) and (3) to the next bag will be performed at the same time.
　本発明の前記実施形態に限定されることなく、特許請求の範囲に記載された技術的思想の範囲内で種々の変更、変形が可能である。 The present invention is not limited to the above embodiments, and various changes and modifications can be made within the scope of the technical idea described in the claims.
１０:袋体
１２:フィルム
１４:トップシール部
１６:ボトムシール部
１８:サイドシール部
２０:弱化部
２２:弱化部と隣接するトップシール部の先端部
２４:ドット状接合部
２６:トレイ 10: Bag body 12: Film 14: Top seal portion 16: Bottom seal portion 18: Side seal portion 20: Weakened portion 22: Tip portion of the top seal portion adjacent to the weakened portion 24: Dot-shaped joint portion 26: Tray

Claims (13)

  1. 　調理済みの冷凍食品を保存するための冷凍食品保存用袋体であって、
    　前記袋体はフィルムによって形成され、
    　前記袋体は、前記フィルムが互いに重ねて接合され前記袋体の内部を封止する接合部を少なくとも一つの端部に備え、
    　前記接合部の一部に、前記接合部の他の部分より接合強度が低い弱化部が、前記接合部を前記袋体の内部から外部に向う方向に横断するように設けられ、
    　前記弱化部では、前記重ねられたフィルムが複数のドット状接合部によってのみ相互に接続され、
    　前記複数のドット状接合部は、前記弱化部の前記袋体の内部側に位置する部分の剥離強度が前記弱化部の他の部分の剥離強度より低くなるように、前記弱化部の全幅にわたって配置されている、
    　ことを特徴とする冷凍食品保存用袋体。     A frozen food storage bag for storing cooked frozen food,
    The bag body is formed of a film,
    The bag has at least one end portion a joint where the films are overlapped and joined to seal the inside of the bag;
    A weakened part having a lower bonding strength than other parts of the joint is provided in a part of the joint so as to cross the joint in a direction from the inside of the bag to the outside,
    In the weakened portion, the stacked films are interconnected only by a plurality of dot-like joints;
    The plurality of dot-like joints are arranged over the entire width of the weakened portion such that the peel strength of a portion of the weakened portion located on the inside side of the bag is lower than the peel strength of other portions of the weakened portion. has been,
    A bag body for storing frozen food, which is characterized by:
  2. 　前記複数のドット状接合部は、該複数のドット状接合部によって覆われる領域の前記袋体の内部空間に面する部分が前記袋体の内部側に向かって先細りするように、配置されている、
    　請求項１に記載の冷凍食品保存用袋体。     The plurality of dot-like joints are arranged such that a portion of the region covered by the plurality of dot-like joints facing the internal space of the bag tapers toward the inside of the bag. ,
    The frozen food storage bag according to claim 1.
  3. 　前記複数のドット状接合部は、該複数のドット状接合部によって覆われる領域が前記袋体の内部側に向かって先細りする形状を有するように、配置されている、
    　請求項２に記載の冷凍食品保存用袋体。     The plurality of dot-like joints are arranged such that the region covered by the plurality of dot-like joints has a shape that tapers toward the inside of the bag;
    The frozen food storage bag according to claim 2.
  4. 　前記複数のドット状接合部は、該複数のドット状接合部によって覆われる領域が前記袋体の内部側に向かって先細りする略Ｖ字形状を有するように、配置されている、
    　請求項２に記載の冷凍食品保存用袋体。     The plurality of dot-like joints are arranged so that the region covered by the plurality of dot-like joints has a substantially V-shape that tapers toward the inside of the bag;
    The frozen food storage bag according to claim 2.
  5. 　前記複数のドット状接合部は、前記弱化部の少なくとも一部において、前記袋体の内部側から外部側に向かって、前記弱化部の幅方向の数が増加するように配置されている、
    　請求項２に記載の冷凍食品保存用袋体。     The plurality of dot-shaped joints are arranged in at least a portion of the weakened portion so that the number of the weakened portions in the width direction increases from the inside to the outside of the bag.
    The frozen food storage bag according to claim 2.
  6. 　前記ドット状接合部は、前記弱化部内の幅方向位置が、該ドット状接合部に前記袋体の外側方向に隣接し前記弱化部の幅方向に並んだ２つのドット状接合部の間に位置するように配置されている、
    　請求項２に記載の冷凍食品保存用袋体。     The widthwise position of the dot-like joint within the weakened portion is located between two dot-like joints that are adjacent to the dot-like joint in the outer direction of the bag body and lined up in the width direction of the weakened portion. is arranged so that
    The frozen food storage bag according to claim 2.
  7. 　前記ドット状接合部は、前記弱化部の幅方向に延びる列を構成し、この列が、前記袋体の内部から外部に向かって並ぶように配置されている、
    　請求項２に記載の冷凍食品保存用袋体。     The dot-shaped joint portions constitute a row extending in the width direction of the weakened portion, and the rows are arranged so as to line up from the inside to the outside of the bag body.
    The frozen food storage bag according to claim 2.
  8. 　前記弱化部に隣接する前記接合部の接合強度が、前記接合部の他の部分の接合強度より高く設定されている、
    　請求項１に記載の冷凍食品保存用袋体。     The joint strength of the joint portion adjacent to the weakened portion is set higher than the joint strength of other parts of the joint portion,
    The frozen food storage bag according to claim 1.
  9. 　前記弱化部が、前記袋体の反対側の２つの端に、それぞれ、設けられている、
    　請求項１に記載の冷凍食品保存用袋体。     The weakened portions are provided at two opposite ends of the bag body, respectively.
    The frozen food storage bag according to claim 1.
  10. 　前記ドット状接合部の寸法が0.1ｍｍ以上１ｍｍ以下である、
    　請求項１に記載の冷凍食品保存用袋体。     The size of the dot-shaped joint is 0.1 mm or more and 1 mm or less,
    The frozen food storage bag according to claim 1.
  11. 　前記袋体が、縦方向の長さが10ｃｍ以上60ｃｍ以下、横方向の長さが10ｃｍ以上40ｃｍ以下の矩形形状を有し、
    　前記接合部は、0.2ｍｍ以上20ｍｍ以下の幅を有し、
    　前記弱化部は前記接合部に沿った長さが、10ｍｍ以上60ｍｍ以下である、
    　請求項１に記載の冷凍食品保存用袋体。     The bag has a rectangular shape with a length in the vertical direction of 10 cm or more and 60 cm or less, and a length in the horizontal direction of 10 cm or more and 40 cm or less,
    The joint portion has a width of 0.2 mm or more and 20 mm or less,
    The weakened portion has a length along the joint portion of 10 mm or more and 60 mm or less,
    The frozen food storage bag according to claim 1.
  12. 　前記接合部と前記弱化部に対応した形状を有する平板型アンビルと、平滑な表面を持つ平板型ホーンとによって２枚のフィルムを接合するステップを有する、
    　ことを特徴とする請求項１に記載の冷凍食品保存用袋体の製造方法。     a step of joining two films with a flat anvil having a shape corresponding to the joining part and the weakened part, and a flat horn having a smooth surface;
    The method for manufacturing a bag for storing frozen food according to claim 1.
  13. 　請求項１に記載の袋体に１００ｇ以上１０００ｇ以下の調理済み冷凍食品を収納した保存用冷凍食品。 A frozen food for preservation, in which 100 g or more and 1000 g or less of a cooked frozen food is stored in the bag according to claim 1.
PCT/JP2023/028399 2022-08-12 2023-08-03 Frozen-food-preserving bag body, and method for producing same WO2024034510A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5623466A (en) * 1979-07-25 1981-03-05 Mitsubishi Plastics Ind Packed vessel having easy unsealing property
JPH1059432A (en) * 1996-08-20 1998-03-03 Kazuo Itami Packaging structure
JP2001063775A (en) * 1999-08-26 2001-03-13 Tsutsumi Yotaro Package for use in microwave oven
WO2014196071A1 (en) * 2013-06-06 2014-12-11 NISHIOKA Mari Bag

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5623466B2 (en) 2012-06-29 2014-11-12 東芝エレベータ株式会社 BIM system, method and program

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5623466A (en) * 1979-07-25 1981-03-05 Mitsubishi Plastics Ind Packed vessel having easy unsealing property
JPH1059432A (en) * 1996-08-20 1998-03-03 Kazuo Itami Packaging structure
JP2001063775A (en) * 1999-08-26 2001-03-13 Tsutsumi Yotaro Package for use in microwave oven
WO2014196071A1 (en) * 2013-06-06 2014-12-11 NISHIOKA Mari Bag

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