JP3867084B2 - Packaging bag - Google Patents

Description

  The present invention relates to a package for packaging contents such as a liquid, a solid, or a mixture thereof, and more specifically, a liquid, a solid, or a food including a mixture thereof. The contents of the package can be cooked with a microwave oven, and the steam generated in the package can be released by cooking and the contents of the package are ruptured, deformed, and spilled. It is related with the package which can prevent.

  Traditionally, cooked or semi-cooked foods such as meat buns, anmans, shumai, dumplings, hamburgers, hot dogs, spaghetti, fried noodles, fried noodles, rice noodles, etc. Packaged foods that are stored in the body and cooked with a microwave oven when eating are on the market. However, when a package containing such food is heated together with the package in a microwave oven, the internal pressure of the package rises due to the thermal expansion of steam and internal air generated from the food, and the package suddenly breaks, There was a problem that food stored in the package was scattered and the inside of the microwave oven was soiled.

  In order to solve this problem, before cooking with a microwave oven, the package body is usually punched with a sharp object in advance, and the end of the package body is cut off with scissors, etc. To prevent the package from breaking the bag. However, the method of releasing these internal pressures is quite troublesome. At the same time, steam generated when cooking is started is immediately released to the outside of the package, and the steaming effect by steam is reduced and the taste is lowered. In order to save this trouble, for example, a resin-based non-woven fabric is used as the base material of the package body, a valve-structured ventilation material is attached to the package body, and the package body is sealed with a cold sealant. Things have been done. As another solution, a film made of a mixed resin of polypropylene and polyethylene is used on one side, and an unstretched polypropylene film is used on the other side, so that the internal pressure of the packaging bag reaches a predetermined pressure during cooking in a microwave oven. A packaging bag for a microwave oven is disclosed that can be easily opened (see, for example, Patent Document 1).

However, if a nonwoven fabric or the like is used for the base material of the package, there is a problem that sealing cannot be performed, and the method of attaching a ventilation material to the package has a problem that the cost is high, and the method using a cold sealant is Not only is it difficult to seal completely, but there is a problem that the seal strength is weak and the seal naturally peels off during transportation, etc. In addition, the one proposed in Patent Document 1 changes the material on both sides. There is a problem that it becomes complicated in terms of handling and management.
Japanese Utility Model Publication No. 2-15789

Accordingly, the present invention has been made in view of the above problems, and the object of the present invention is to completely seal a food such as cooked or semi-cooked food, and to store the food in a packaging bag in an electronic manner. can cooking by oven further by steam generated during cooking relief automatically opening a part of the packaging bag is the internal pressure in the packaging bag while exhibit the cook by steam effect stored in the packaging bag food packaging An object of the present invention is to provide a packaging bag that can prevent the bag from bursting and deforming.

As a result of various studies conducted by the inventors to solve the above-described problems, the present invention according to claim 1 is characterized in that a packaging material composed of a heat-adhesive resin layer is sealed in a heat-bonding portion as an inner layer. in the packaging bag, the heat projecting portion that is thermally bonded overhanging the inside of the packaging bag and connected to the heat-bonding unit from the inner peripheral portion of the bonded portion of the packaging bag has at least one location, said thermal bonding cuts or notches on the projecting portion remote from the outer peripheral edge parts are formed, said cuts or width from the edge of the notch to the outer edge of the overhanging portion overhanging the nearest inside width of the heat-bonding portion It is characterized by being formed narrower than that. By configuring in this way, food such as cooked or semi-cooked can be completely sealed, and the food can be cooked with a microwave while being stored in a packaging bag , and further by steam generated during cooking while provide an advantage that cook by steam was housed in the packaging bag food, by the projecting portion is protruded inward in the packaging bag, the internal pressure in the packaging bag to peel faster than other thermal bonding unit said Zhang It can automatically escape from a cut or notch provided in the exit portion to prevent rupture. Further, the overhang portion can be formed simultaneously with the formation of the thermal bonding portion. Further, a cut or notch provided in the overhanging portion can be provided from the overhanging portion to the thermal bonding portion connected to the overhanging portion. For example, the cut or notch is used as a hanging portion for display and sale. You can also

The invention according to claim 2 is the packaging bag according to claim 1, wherein the cut or notch is formed in an unbonded portion. By configuring in this way, the overhanging part that protrudes inside the packaging bag starts to peel off by internal pressure faster than the other heat-bonded parts, and when the peeling reaches the non-bonded part, the internal pressure is released and the internal pressure is released. However, it is possible to easily release the internal pressure because the overhanging portion is peeled off at a stretch by being concentrated on the non-bonded portion and opened larger.

Moreover, the present invention according to claim 3 is the packaging bag according to any one of claims 1 and 2, wherein the cut or notch is formed through the packaging material constituting the overhanging portion. It is a feature.

Further, the present invention according to claim 4 is the packaging bag according to any one of claims 1 and 2, wherein the cut or notch is formed in one of the facing packaging materials constituting the overhanging portion. It is characterized by that. By comprising in this way, the internal pressure in the packaging bag which increases by cooking can be released in a desired direction. For example, when the contents are liquid, the side provided with a cut or notch is provided. By setting it as the upper side, it is possible to prevent spillage and the like during cooking.

Moreover, this invention of Claim 5 is a packaging bag in any one of Claims 1-4. WHEREIN: The said overhang | projection part is formed in the edge | side of the said packaging bag , It is characterized by the above-mentioned. By configuring in this way, especially when the packaging bag has a shape having a corner, for example, the pouch of the three-side seal type, the four-side seal type, the pillow type, the gusset type, the standing type, the envelope seal type, Rather than providing overhangs at the corners, the internal pressure in the packaging bag that is increased by cooking is more likely to be applied to the sides of the packaging bag , and it is more preferable to automatically release the internal pressure.

The packaging bag of the present invention can completely seal a food such as cooked or semi-cooked food, and can be cooked by a microwave while the food is stored in the packaging bag , and is generated during cooking. It has the effect of steaming the food stored in the packaging bag with steam. In addition, it is possible to prevent the packaging bag from being ruptured and deformed by automatically opening and releasing a part of the packaging body from the internal pressure in the packaging bag . Furthermore, it is possible to limit the direction in which the internal pressure in the packaging bag is released, and to prevent the contents from being blown out.

The present invention will be described in detail below.
First, in the present invention, the resin used for the inner heat-adhesive resin layer is a polypropylene resin and a polyethylene resin from the viewpoints of hermeticity, suitability for automatic packaging machines, easy peelability, especially oil resistance and heat resistance. A mixed resin of olefin copolymer rubber is preferred.

  Examples of the polypropylene resin which is one composition of the mixed resin include a crystalline propylene random copolymer, which is propylene and ethylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene. 1, random copolymers with α-olefins such as octene-1, and the like, and crystalline propylene-ethylene random copolymers are particularly preferable. The random copolymer may be a mixture with homopolypropylene obtained by multistage polymerization.

  Moreover, as a polyethylene-type resin which is one composition of the said mixed resin, any ethylene homopolymers, such as a high pressure method low density polyethylene, a linear low density polyethylene, a medium density polyethylene, and a high density polyethylene, are used, for example. In addition to propylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, octene-1, and other α-olefins, or crystalline with vinyl acetate, low crystallinity or An amorphous random or block copolymer, or a mixture thereof can be used, and among them, a high pressure method low density polyethylene is preferable.

  Examples of the olefin copolymer rubber that is one composition of the mixed resin include two kinds of monoolefins such as ethylene, propylene, butene-1, hexene-1, 4-methylpentene-1, or the like, or 3 or more types of monoolefin copolymer rubbers, 2 types of the above monoolefins, and non-conjugated diolefins such as dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylene norbornene, and ethylidene norbornene, or butadiene and isoprene A copolymer rubber with a conjugated diolefin such as ethylene propylene copolymer rubber, ethylene butene copolymer rubber, and propylene butene copolymer rubber is preferable.

  Next, the heat sealable resin layer of the inner layer is composed of a mixed resin of a polypropylene resin, a polyethylene resin, and an olefin copolymer rubber as described above, and the blending ratio of each composition of the mixed resin Is suitable to be used in the range of 45 to 65% by weight of polypropylene resin, 35 to 55% by weight of polyethylene resin, and 2 to 5% by weight of olefin copolymer rubber with respect to 100% by weight of the mixed resin. It is.

  Moreover, 20-60 micrometers is suitable as a thickness in the case of using the said mixed resin independently as a thermoadhesive resin layer of an inner layer, Preferably it is 25-50 micrometers. If necessary, homopolypropylene or crystalline propylene random copolymer is used as a support for the inner heat-adhesive resin layer, and the support, the polypropylene resin, the polyethylene resin, and the olefin copolymer are used. A mixture resin with a polymer rubber may be coextruded, and the thickness of the mixed resin and the thickness of the support in that case may be appropriately selected depending on the type of food.

  Examples of the resin other than the mixed resin that can be used as the heat sealable resin layer of the inner layer include, for example, ethylene-vinyl acetate copolymer resins, modified polyolefin resins such as modified polyethylene and modified polypropylene, and the like. In the case of a food that does not require consideration of oil resistance and heat resistance, it can be used in the same manner as the above mixed resin.

Next, in the packaging bag of the present invention, as a film used as an outer layer, since it becomes a basic material constituting the packaging bag, a synthetic resin having excellent properties in mechanical, physical, chemical, etc. should be used. For example, resins such as polyester, polyamide, polypropylene, polycarbonate, and polyacetal can be used, and cellophane, synthetic paper, and the like can also be used. In addition, since the film used as the outer layer is often printed on the inner layer side of the film, the film used as the outer layer is required to have printability and stretched in the biaxial direction. A stretched film is preferred. The thickness of the film may be a thickness that can be kept to the minimum necessary with respect to strength, rigidity, etc. as a basic material, and about 12 to 30 μm is appropriate in consideration of cost. Moreover, the said film is good also as a structure which has barrier property as a film in which the vapor deposition layer of inorganic substances, such as a film coated with polyvinylidene chloride as needed, and silicon oxide and aluminum oxide, was formed.

Further, in the present invention, an intermediate layer may be provided between the inner layer and the outer layer, and the intermediate layer is usually used only when the inner layer and the outer layer cannot sufficiently function as a packaging bag. Provided. The functions include gas barrier properties, mechanical toughness, flex resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, etc., which are required as packaging bags. These final functions are achieved by providing an intermediate layer. Examples of the substrate used as the intermediate layer include polyolefins such as polyethylene terephthalate, polyamide, polyethylene, and polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, saponified ethylene-vinyl acetate copolymer, and the like. Films, films coated with polyvinylidene chloride or films deposited with inorganic substances such as silicon oxide and aluminum oxide, films such as polyvinylidene chloride, or paper, cellophane, synthetic paper, non-woven fabric, etc. Can do. One or more of these substrates can be used in combination. It should be noted that the thickness of the base material only needs to satisfy the function required as a packaging bag , and can be appropriately selected as necessary.

Next, the present invention will be described in more detail using an embodiment shown in the drawings.
1 is a plan view of a first embodiment of a packaging bag according to the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, and FIG. 3 is a sectional view taken along line XX during cooking in FIG. 4 is a cross-sectional view taken along line XX when cooking is completed in FIG. 1, FIG. 5 is a plan view of a second embodiment of the packaging bag according to the present invention, and FIG. 6 is taken along line YY in FIG. FIG. 7 is a plan view of a third embodiment of the packaging bag according to the present invention, FIG. 8 is a sectional view taken along line MM in FIG. 7, and FIG. 9 is an example of the packaging bag according to the present invention. 1, 1 ′, 1 ″ are packaging bags, 2, 2 ′ are thermal bonding portions, 3, 3 ′, 3 ″ are overhanging portions, 4, 4 ′, 4 ″ are notches 5 is a back seal part, 6 is a back part, 40 is a peeling part, 50 is a laminated body, 51 is an inner layer, 53 is an outer layer.

  FIG. 1 is a plan view of a packaging bag according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1, and the packaging bag 1 is thermally bonded to the outer layer 53 with easy peeling. A rectangular laminated body 50 composed of an inner layer 51 that is a conductive resin layer is superposed so that the inner layers 51 face each other, and the four end edges are thermally bonded to each other, so that the four sides have the thermal bonding portion 2 on the four end edges. In the seal type packaging bag, a substantially semi-circular overhanging portion 3 that is thermally bonded to the inside of the bag of the packaging bag 1 is formed at a substantially central portion of one edge of the thermal bonding portion 2; A substantially circular notch 4 is provided on one side of the laminate 50 so as to include the inside of the overhang portion 3.

  In addition, although not shown, the packaging bag 1 contains cooked noodles such as rice noodles, fried noodles, and grilled udon, meat buns, anpan, shumai, dumplings, hamburgers, hot dogs, and the like. It is of the type that is cooked for a predetermined time in a microwave oven.

  FIG. 3 is a cross-sectional view taken along the line XX in FIG. 1, and contains cooked noodles such as rice noodles, fried noodles, and grilled udon, foods such as meat buns, anpan, shumai, dumplings, hamburgers, and hot dogs. When the packaging bag 1 is put in a microwave oven and cooked, the steam generated from the food and the air in the packaging bag are thermally expanded, the internal pressure F is increased, and the packaging bag 1 is in a state of being swollen, Due to the internal pressure F, peeling 40 due to delamination or cohesive failure occurs between the inner layers 51 and 51 of the substantially semicircular overhanging portion 3 provided in the substantially central portion of one edge of the packaging bag 1 or from the inner layer 51 of the packaging bag 1. It begins to arise from the inside. Finally, as shown in FIG. 4, the packaging bag 1 has a peeling 40 formed in a substantially semicircular protruding portion 3 provided at a substantially central portion of one end edge of the packaging bag 1, and reaches the notch 4. F is escaped and the packaging bag 1 is prevented from being broken. In addition, since the food stored in the packaging bag 1 can be steamed until the peeling 40 generated in the overhanging portion 3 reaches the notch 4, a better taste can be obtained and the internal pressure can be increased. The direction in which F is released can be limited. In FIG. 1, the protruding portion 3 provided with the substantially circular notch 4 is provided at one end edge, but it may be provided at the other end edge, or a plurality of protrusions 3 may be provided at one end edge. A place may be provided.

FIG. 5 is a plan view of a second embodiment of the packaging bag according to the present invention, FIG. 6 is a cross-sectional view taken along the line Y-Y in FIG. 5, and the packaging bag 1 ′ is a heat having easy peelability from the outer layer 53. Tubular shape having a back seal portion (not shown) bonded to the rectangular laminated body 50 composed of the inner layer 51 as an adhesive resin layer by thermally bonding the inner layers 51 at both opposing ends together. When the back seal part (not shown) is folded at the end of the back seal part (not shown) on the cylindrical body side and is brought into close contact with the cylindrical body, and then used as a packaging bag The opening part at both ends of the cylindrical body is thermally bonded so that the back seal part (not shown) is positioned at the approximate center of the packaging bag, and the heat sealing parts 2 ′ and 2 ′ are provided at both ends. A substantially semi-circular overhanging portion 3 'thermally bonded to the inner side of the packaging bag 1' at one substantially central portion of the folded portion of the wrapped pillow type packaging bag. While it is formed, in which is provided on one of the laminate 50 'substantially circular cutouts 4 in the region of' the projecting portion 3. By configuring in this way, the same effect as described in the first embodiment can be obtained. In FIG. 5, the overhang portion 3 ′ provided with the substantially circular notch 4 ′ is provided at one substantially central portion of the folded portion of the packaging bag 1 ′. Or may be provided at a plurality of locations on the one folded portion. Further, as shown in the first embodiment, the heat-bonding portions 2 ′ and 2 ′ at both ends of the packaging bag 1 ′ may be provided.

FIG. 7 is a plan view of a third embodiment of the packaging bag according to the present invention, FIG. 8 is a cross-sectional view taken along the line MM of FIG. 7, and the packaging bag 1 ″ is a heat having easy peelability from the outer layer 53. A rectangular laminated body 50 composed of an inner layer 51 that is an adhesive resin layer is formed into a back seal portion 5 that is bonded to the inner layer 51 by heat-bonding the inner layers 51 at opposite ends together, and the back seal portion 5 A substantially trapezoidal overhanging portion 3 ″ is formed by connecting the inner layer 51 to each other at a substantially central portion thereof and thermally bonding the inner layers 51 to each other, and in the region of the overhanging portion 3 ″. A cylindrical body having a notch 4 ″ is formed, and the back seal part 5 and the overhanging part 3 ″ are formed by being folded in parallel with the back seal part 5 on the side of the tubular body near the tip of the overhanging part 3 ″. The back part 6 is brought into close contact with the cylindrical body, and the back part 6 is positioned in the approximate center of the packaging bag when the back part 6 is used as a packaging bag. Heat-bonded portions at both end openings of both ends of the Jo body by thermal bonding 2 ', 2' is a pillow type packaging bag is Seibukuro in shape with a. By comprising in this way, the same effect as the effect demonstrated by 1st and 2nd embodiment can be acquired. Moreover, although this overhang | projection part 3 '' showed what was provided in one place in the approximate center part of the said back seal part 5, you may provide in the said back seal part 5 in multiple places.

  Moreover, in the packaging bag demonstrated in the 1st-2nd embodiment, all the notches provided in the overhang | projection part were provided in one laminated body, However, it does not stick to this, both A cutout may be provided in the laminate. In addition, the notch described in the third embodiment is provided so as to penetrate the laminated body forming the overhanging portion as is apparent in FIG. You may provide in any one laminated body of a body.

  Further, the notch is not limited to a substantially circular shape or a substantially trapezoidal shape, and may be, for example, a substantially semicircular shape, a polygonal shape represented by a triangular shape, or the like, and the overhanging portion also has a substantially semicircular shape. The shape is not limited to a circular shape or a substantially trapezoidal shape, and may be, for example, a substantially elliptical shape or a polygonal shape represented by a triangular shape. Further, the number of cutouts provided in the overhanging portion is not limited to one and may be plural.

  Although not described, the shape of the unbonded portion provided in the overhanging portion or the shape of the notch formed in the unbonded portion can take various shapes, for example, a substantially circular shape. It is possible to take a semi-circular shape, a polygonal shape represented by a triangular shape, etc., and a cutting edge formed on a heat-bonded overhanging portion or an unbonded portion formed in the overhanging portion. Various shapes can be adopted, for example, an I shape, a semicircular shape, a boat shape, a cross shape, etc., and the number is not limited to one. It may be individual. Therefore, although not shown in the drawings, it is natural to include notches and cutting blades smaller than the shape of the non-adhered portion provided in the overhanging portion, leaving the outer peripheral edge of the non-adhered portion, etc. .

  The present invention will be described in more detail with reference to the following examples.

  15 μm biaxially stretched polyamide film and crystalline propylene-ethylene random copolymer / high pressure method low density polyethylene / ethylene propylene rubber in a proportion of 58/40/2 wt% of a mixed resin of 50 μm A laminated body bonded by a known dry lamination method using a two-component reactive polyurethane adhesive is prepared, and the unstretched films of the laminated body are overlapped with each other, and the short side Y is 130 mm as shown in FIG. In addition, the long side T is cut into a rectangular shape having a length of 180 mm, and the radius R1 centered on the position A where the dimension CY from the edge of the short side on the 1/2 line of the short side Y is 13.5 mm is 3.5 mm. One of the laminates stacked in a circular shape is punched to form a notch, and then both long sides are sealed from the end edges of both long sides, the seal width ST is 8 mm, and the side on which the circular notch is formed A thermal bonding part is formed with a seal width SY of 10 mm from the edge of the short side of the side, and further connected to the thermal bonding part of the seal width SY in a substantially semicircular shape with a radius R2 centered on the position A of 8.5 mm. Thus, a three-sided seal bag having one side opened was prepared by forming the overhang part so that the maximum overhang dimension H from the inner side of the heat-bonded part having the seal width SY was 12 mm. This three-side sealed bag was filled with meatballs (85 g / bag), and the bag was evacuated, and then 50 bags were made by thermally bonding the openings. This was heated for 90 seconds in a microwave oven (rated high-frequency output 500 W). The heating of both 50 bags starts 30-30 seconds after the internal pressure increases, and the overhanging part peels off and the internal pressure escapes from the circular notch and can be cooked without breaking the bag. The taste of the balls was not impaired.

  15 μm biaxially stretched polyamide film and crystalline propylene-ethylene random copolymer / high pressure method low density polyethylene / ethylene propylene rubber in a proportion of 58/40/2 wt% of a mixed resin of 50 μm A laminate laminated by a known dry lamination method using a two-component reactive polyurethane adhesive is prepared, and the unstretched films of the laminate are overlapped, and the short side Y is 115 mm as shown in FIG. The long side T is cut into a rectangular shape having a length of 170 mm, and the radius R1 centered on the position A where the dimension CY from the edge of the short side on the 1/2 line of the short side Y is 13.5 mm is 3.5 mm. One of the laminates stacked in a circular shape is punched to form a notch, and then both long sides are sealed from the end edges of both long sides, the seal width ST is 8 mm, and the side on which the circular notch is formed A thermal bonding part is formed with a seal width SY of 10 mm from the edge of the short side of the side, and further connected to the thermal bonding part of the seal width SY in a substantially semicircular shape with a radius R2 centered on the position A of 8.5 mm. Thus, a three-sided seal bag having one side opened was prepared by forming the overhang part so that the maximum overhang dimension H from the inner side of the heat-bonded part having the seal width SY was 12 mm. This three-sided seal bag was filled with hamburger (75 g / bag), and the bag was evacuated and the opening was thermally bonded to prepare 50 bags. This was heated for 90 seconds in a microwave oven (rated high-frequency output 500 W). The heating of both 50 bags starts 30-30 seconds after the internal pressure increases, so that the overhanging part peels off and the internal pressure escapes from the circular notch and can be cooked without breaking the bag. The taste of was not impaired.

It is a top view of a 1st embodiment of a packaging bag concerning the present invention. It is sectional drawing of the XX line of FIG. It is sectional drawing of the XX line in the middle of the heat cooking of FIG. It is sectional drawing of the XX line at the time of the completion of the heating cooking of FIG. It is a top view of 2nd Embodiment of the packaging bag concerning this invention. It is sectional drawing of the YY line of FIG. It is a top view of 3rd Embodiment of the packaging bag concerning this invention. It is sectional drawing of the MM line | wire of FIG. It is a top view which shows one Example of the packaging bag concerning this invention.

Explanation of symbols

1, 1 ', 1 "packaging bag 2, 2' heat bonding part 3, 3 ', 3" projecting part 4, 4', 4 "notch 5 back seal part 6 back part 40 peeling part 50 laminate 51 inner layer 53 outer layer

Claims (3)

  In a packaging bag having a thermal bonding portion only on an edge in a plan view, which is thermally bonded and sealed to the entire periphery of the edge of the packaging material composed of a thermal adhesive resin layer on the inner layer, the thermal bonding portion of the packaging bag At least one overhanging portion having an adhesive strength of approximately the same strength as the thermally bonded portion that is connected to the inner peripheral edge and is extended to the inside of the packaging bag and thermally bonded is formed, and the overhanging portion is connected. The thermal bonding portion is formed with a constant width from an edge, and is used to release internal pressure during heating to the overhang portion formed on one of the facing packaging materials constituting the overhang portion. A packaging bag in which a cut or notch is formed, and a width from an edge of the cut or notch to the outer edge of the nearest overhang portion is narrower than a width of the thermal bonding portion.   The packaging bag according to claim 1, wherein an unbonded portion is formed in the projecting portion, and the cut or notch is formed in the unbonded portion.   The packaging bag according to claim 1, wherein the overhang portion is formed on a side of the packaging bag.