JP2004210407A - Wrapper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wrapper where cooked, half-cooked food or the like can be completely sealed, the food housed in the wrapper as it stands can be cooked by heating with a microwave oven, a condition exerts an effect that the food housed in the wrapper is steamed by steam generated while the food is cooked by heating and an internal pressure built inside the wrapper is released by allowing a part of the wrapper to automatically open, thereby the fracture or deformation of the wrapper can be prevented. <P>SOLUTION: In the wrapper that a wrapper comprising a thermally adhesive resin layer is sealed at a thermally bonded section in an internal layer, the wrapper has at least one overhang section which is connected with the thermally bonded section from an internal peripheral section of the thermally bonded section in the wrapper, overhangs into an interior of the wrapper and is thermally bonded thereto, and a cutting edge or a cutout is formed at the overhang section. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a liquid material, a solid material, or a package for packaging contents such as a food made of a mixture thereof, and more specifically, a liquid material, a solid material, or a food made of a mixture thereof. In a state where the contents are stored in a package, the contents can be heated and cooked by a microwave oven, and steam or the like generated in the package can be released by heating and cooking. The present invention relates to a package that can prevent the occurrence of a wrap.

  Conventionally, cooked or semi-cooked foods, for example, meat noodles, bean jam, shumai, dumplings, hamburgers, hot dogs, spaghetti, fried noodles, fried noodles, rice noodles, etc. are packaged in plastic packaging bags and the like. Packaged foods that are stored in the body and cooked by microwave when eating are on the market. However, when a package containing such food is heated together with a microwave in a microwave oven, the internal pressure of the package increases due to steam generated from the food and thermal expansion of internal air, and the package suddenly breaks, There is a problem that the food stored in the package is scattered and the inside of the microwave oven is soiled.

  In order to solve this problem, before cooking in a microwave oven, it is usually necessary to make a hole in the package in advance with a sharp object, cut off the end of the package with scissors, etc. To prevent the package from breaking. However, the method of releasing these internal pressures is quite troublesome, and at the same time, the steam generated by the start of the heating and cooking is immediately released to the outside of the package, and the steaming effect by the steam is reduced and the taste is reduced. In order to eliminate this trouble, for example, a resin-based nonwoven fabric or the like is used as a base material of the package, or a ventilation material having a valve structure is attached to the package, or the package is sealed with a cold seal agent. That is being done. Another solution is to use a film made of a mixed resin of polypropylene and polyethylene on one side, and use an unstretched polypropylene film on the other side, so that the internal pressure of the packaging bag reaches a predetermined pressure during heating and cooking in a microwave oven. There has been disclosed a packaging bag for a microwave oven which can be easily opened when it is opened (for example, see Patent Document 1).

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

  Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to completely seal a cooked or semi-cooked food and the like, and to electronically store the food in a package. A part of the package automatically opens and releases the internal pressure inside the package, while the effect of steaming the food stored in the package by the steam generated during the cooking can be cooked by the microwave oven, and the package is released. An object of the present invention is to provide a package that can prevent rupture and deformation of the package.

The present inventors have conducted various studies in order to solve the above problems, and as a result, in the present invention according to claim 1, a packaging material having a heat-adhesive resin layer as an inner layer is sealed with a heat-adhesive portion. In the package, the package has at least one projecting portion that is connected to the thermal bonding portion from the inner peripheral portion of the thermal bonding portion and projects to the inside of the package and is thermally bonded. A cutting blade or a notch is formed in the portion . With such a configuration, the cooked or semi-cooked food can be completely sealed, the food can be cooked by a microwave oven while being stored in the package, and the steam generated during the cook can Since the overhanging portion extends over the inside of the package while exhibiting the effect of steaming the food stored in the package, the internal pressure in the package is increased by the overhang to peel off faster than other heat-bonded portions. It can be automatically released from the cutting blade or notch provided in the portion to prevent rupture. Further, the overhang portion can be formed simultaneously with the formation of the thermal bonding portion. Further, a cutting blade or a 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 cutting blade or the notch can be used as a hanging portion. It can also be exhibited and sold.

According to a second aspect of the present invention, in the package according to the first aspect, the cutting edge or the notch is formed so as to penetrate a packaging material forming the overhang. It is .

According to a third aspect of the present invention, in the package according to the first aspect, the cutting edge or the notch is formed in one of the facing packaging materials forming the overhanging portion. It is a feature . With this configuration, the internal pressure in the package, which is increased by heating and cooking, can be released in a desired direction.For example, when the content is a liquid, the side provided with a cutting blade or a notch can be used. By setting the upper side, it is possible to prevent spills and the like during heating and cooking.

According to a fourth aspect of the present invention, in the package according to any one of the first to third aspects, the overhang portion is formed on a side of the package . With such a configuration, particularly when the package has a shape having a corner, for example, a pouch such as a three-side seal type, a four-side seal type, a pillow type, a gusset type, a standing type, and an envelope seal type, The internal pressure in the package, which is increased by heating and cooking, is more likely to be applied to the sides of the package than when the overhanging portion is provided at the corner, which is more suitable for automatically releasing the internal pressure.

  INDUSTRIAL APPLICABILITY The package of the present invention can completely seal foods such as cooked or semi-cooked foods, can be cooked by a microwave oven with the foods stored in the package, and can be generated during cooking. This has the effect of steaming the food stored in the package with the steam. In addition, by automatically opening the part of the package and releasing the internal pressure in the package, the rupture and deformation of the package can be prevented. Furthermore, the direction in which the internal pressure in the package is released can be limited, and the contents can be prevented from being spilled over.

The present invention will be described in detail below.
First, in the present invention, the resin used for the inner layer of the heat-adhesive resin layer includes a polypropylene-based resin and a polyethylene-based resin in terms of sealing properties, suitability for an automatic packaging machine, easy peelability, especially oil resistance and heat resistance. A mixed resin of olefin and an olefin-based copolymer rubber is preferred.

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

  In addition, as the polyethylene resin which is one composition of the mixed resin, for example, any ethylene homopolymer such as a high-pressure low-density polyethylene, a linear low-density polyethylene, a medium-density polyethylene, and a high-density polyethylene is used. In addition, propylene, butene-1, pentene-1, hexene-1, 3-methylbutene-1, 4-methylpentene-1, octene-1, and other α-olefins, or crystallinity with vinyl acetate, or low crystallinity or Amorphous random or block copolymers, or mixtures thereof can be used, and among them, high-pressure low-density polyethylene is preferable.

  Examples of the olefin copolymer rubber, which is a composition of the mixed resin, include two or more monoolefins such as ethylene, propylene, butene-1, hexene-1,4-methylpentene-1, or Three or more monoolefin copolymer rubbers, and two or more of the above monoolefins and non-conjugated diolefins such as dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylenenorbornene, and ethylidene norbornene, or butadiene, isoprene Copolymer rubbers with conjugated diolefins such as the above can be used, and among them, ethylene propylene copolymer rubber, ethylene butene copolymer rubber, and propylene butene copolymer rubber are preferable.

  Next, the inner heat-sealable resin layer is made of a mixed resin of a polypropylene resin, a polyethylene resin, and an olefin copolymer rubber as described above, and the mixing ratio of each composition of the mixed resin. It is appropriate that the polypropylene resin is used in the range of 45 to 65% by weight, the polyethylene resin is used in the range of 35 to 55% by weight, and the olefin copolymer rubber is used in the range of 2 to 5% by weight based on 100% by weight of the mixed resin. It is.

  When the mixed resin is used alone as the inner heat-adhesive resin layer, the thickness is suitably from 20 to 60 μm, and preferably from 25 to 50 μm. If necessary, a homopolypropylene or a crystalline propylene random copolymer may be used as a support for the heat-adhesive resin layer of the inner layer, and the support, the polypropylene-based resin, the polyethylene-based resin and the olefin-based copolymer may be used. The resin mixture with the polymer rubber may be co-extruded. In this case, the thickness of the mixed resin and the thickness of the support may be appropriately selected depending on the type of food.

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

  Next, in the package of the present invention, as a film used as an outer layer, a synthetic resin having excellent properties in mechanical, physical, chemical, and the like is used because it is a basic material constituting a packaging bag. For example, polyester-based, polyamide-based, polypropylene-based, polycarbonate-based, and polyacetal-based resins 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 generally printed on the inner layer side of the film in general, the film used as the outer layer is required to have printability, and is stretched biaxially. Stretched films are preferred. The thickness of the film may be any thickness that can maintain the necessary minimum strength and rigidity as a basic material, and is suitably about 12 to 30 μm in consideration of cost. Further, the film may have a barrier property as a film coated with polyvinylidene chloride as needed or a film formed with a deposited layer of an inorganic substance such as silicon oxide or aluminum oxide.

  Furthermore, in the present invention, an intermediate layer may be provided between the inner layer and the outer layer, and the intermediate layer usually cannot sufficiently function as a packaging bag with only the inner layer and the outer layer. Provided. The functions include gas barrier properties, mechanical toughness, bending resistance, piercing resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, chemical resistance, etc., and 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. Or a film coated with polyvinylidene chloride, a film on which an inorganic substance such as silicon oxide or aluminum oxide is deposited, or a film such as polyvinylidene chloride, or paper, cellophane, synthetic paper, nonwoven fabric, etc. Can be. Further, one or more of these base materials can be used in combination. Note that the thickness of the base material is not particularly limited as long as the function required for the package is satisfied, and can be appropriately selected as needed.

Next, a more detailed description will be given with reference to an embodiment shown in the drawings.
1 is a plan view of a package according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line XX of FIG. 1, and FIG. 3 is a cross-sectional view taken along line XX of FIG. FIG. 4 is a cross-sectional view taken along line XX of FIG. 1 at the time of completion of heating, FIG. 5 is a plan view of a second embodiment of the package according to the present invention, and FIG. 7 is a plan view of a third embodiment of the package according to the present invention, FIG. 8 is a cross-sectional view taken along line MM of FIG. 7, and FIG. 9 is an example of the package according to the present invention. FIG. 1 is a plan view showing a packaging bag, in which 1, 1 'and 1 "are packaging bags, 2 and 2' are heat bonded portions, 3, 3 'and 3" are overhanging portions, and 4, 4' and 4 "are cutouts. 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, and 53 is an outer layer.

  FIG. 1 is a plan view of a first embodiment of a packaging bag according to the present invention, and FIG. 2 is a cross-sectional view taken along line XX of FIG. A rectangular laminate 50 composed of a conductive resin layer and an inner layer 51 is overlapped with each other so that the inner layers 51 face each other, and the four edges are thermally bonded to each other. A sealing type packaging bag, wherein a substantially semicircular overhang portion 3 which is thermally bonded to the inside of the bag of the packaging bag 1 is formed substantially at the center of one end edge of the thermal bonding portion 2; A substantially circular notch 4 is provided in one of the stacked bodies 50 so as to include the inside of the overhang portion 3.

  Also, although not shown, the packaging bag 1 contains cooked noodles such as rice noodles, fried noodles, fried noodles, and other foods such as meatballs, bean paste, shrimp, shrimp, dumplings, hamburgers, and hot dogs. It is a type of heating and cooking in a microwave oven for a predetermined time.

  FIG. 3 is a cross-sectional view taken along the line XX of FIG. 1 during cooking, in which cooked noodles such as rice noodles, fried noodles, fried udon, and other foods such as meat buns, an buns, shumai, dumplings, hamburgers, and hot docks are stored. When the packaging bag 1 is placed 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 swelled in a pan. Due to the internal pressure F, between the inner layers 51, 51 or between the inner layers 51 of the substantially semicircular overhanging portion 3 provided substantially at the center of one end edge of the packaging bag 1, peeling 40 due to delamination or cohesive failure of the packaging bag 1 is caused. Begin to arise from the inside. Finally, as shown in FIG. 4, in the packaging bag 1, the peeling 40 generated in the substantially semicircular overhanging portion 3 provided substantially at the center of one edge of the packaging bag 1 reaches the notch 4 and the internal pressure is reduced. F is released, 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 overhang portion 3 reaches the notch 4, a better taste can be obtained and the internal pressure can be increased. The direction in which F escapes can be limited. In FIG. 1, the overhang portion 3 provided with the substantially circular notch 4 is provided at one position on one edge, but may be provided on another edge, or a plurality of protrusions may be provided on one edge. A portion may be provided.

  FIG. 5 is a plan view of a second embodiment of the package according to the present invention, and FIG. 6 is a cross-sectional view taken along the line YY of FIG. A cylindrical shape having a back seal portion (not shown) which is stuck to each other by thermally bonding a rectangular laminate 50 composed of an inner layer 51 which is an adhesive resin layer and the inner layers 51 at opposite ends. When the back seal portion (not shown) is folded at the end of the back seal portion (not shown) on the side of the tubular body so as to be in close contact with the tubular body, and then used as a packaging bag. The openings at both ends of the cylindrical body are heat-bonded so that the back seal portion (not shown) is located substantially at the center of the packaging bag, so that the shape is provided with heat bonding portions 2 ', 2' at both ends. A substantially semicircular overhang that is heat-bonded to the inside of the bag of the packaging bag 1 'at approximately the center of one of the folded portions of the bagged pillow-type packaging bag. 'Together is formed, the projecting portion 3' 3 in which in the region of a substantially circular cutout 4 'provided on one of the laminate 50. With such a configuration, the same effect as that described in the first embodiment can be obtained. In FIG. 5, the overhanging portion 3 ′ provided with the substantially circular notch 4 ′ is provided at one location substantially at one center of the folded portion of the packaging bag 1 ′, but is provided at the other folded portion. May be provided, or a plurality of portions may be provided in the one folded portion. Further, as shown in the first embodiment, it may be provided at the thermal bonding portions 2 ', 2' at both ends of the packaging bag 1 '.

  FIG. 7 is a plan view of a third embodiment of the package according to the present invention, and FIG. 8 is a cross-sectional view taken along the line MM of FIG. A rectangular laminated body 50 including an inner layer 51 which is an adhesive resin layer is heat-bonded together with the inner layers 51 at both ends facing each other to form a back seal portion 5 which is affixed to the palms. A substantially trapezoidal overhang portion 3 ″ is formed substantially at the center of the back seal portion 5 and is thermally bonded to the inner layers 51. The substantially trapezoidal overhang portion 3 ″ is formed in the region of the overhang portion 3 ″. A cylindrical body having a notch 4 "is formed. The cylindrical body near the tip of the overhang portion 3" is folded in parallel with the back seal portion 5 and comprises the back seal portion 5 and the overhang portion 3 ". The back portion 6 is brought into close contact with the tubular body, and the back portion 6 is positioned substantially at the center of the packaging bag when the back portion 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. With this configuration, the same effects as those described in the first and second embodiments can be obtained. Although the overhang portion 3 ″ is provided at one location substantially at the center of the back seal portion 5, a plurality of locations may be provided at the back seal portion 5.

  Further, in the packaging bag described in the first and second embodiments, all the cutouts provided in the overhang portion are provided in one of the laminates, but the present invention is not limited to this, and both are not limited thereto. Notches may be provided in the laminated body. Further, the notch described in the third embodiment is provided so as to penetrate the laminated body forming the overhang as clearly shown in FIG. 8. It may be provided on any one of the laminated bodies.

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

  Although not described, the shape of the unbonded portion provided in the overhang portion, or the shape of the notch formed in the unbonded portion can also take various shapes, for example, a substantially circular shape. , A semi-circular shape, or a polygonal shape typified by a triangular shape, and a cutting edge formed on a thermally bonded overhang or an unbonded portion formed on the overhang. The shape can also take various shapes, for example, an I-shape, a semicircle shape, a boat shape, a cross shape, and the like, and the number is not limited to one. It may be an individual. Therefore, although not shown in the drawings, notches and cutting blades smaller than the shape of the unbonded portion provided in the overhanging portion, and those having a shape leaving the outer peripheral edge of the unbonded portion and the like are naturally included. .

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

  A 15 μm biaxially stretched polyamide film and a 50 μm non-stretched film made of a mixed resin of a crystalline propylene-ethylene random copolymer / a high-pressure low-density polyethylene / ethylene propylene rubber in a ratio of 58/40/2 by weight are used. Using a two-component reactive polyurethane-based adhesive, a laminate was prepared by laminating by a well-known dry lamination method, and the unstretched films of the laminate were overlapped with each other. As shown in FIG. 9, the short side Y was 130 mm. A long side T is cut into a rectangular shape having a length of 180 mm, and a radius R1 centered on a position A having a dimension CY from an edge of the short side of 13.5 mm on a half line of the short side Y is 3.5 mm. A notch is formed by punching out one of the laminates superimposed in a circular shape, and then the long side is formed on the side where the seal width ST is 8 mm from the edge of both long sides and the circular notch is formed. A heat bonding portion is formed with a seal width SY of 10 mm from the edge of the short side, and is connected to the heat bonding portion of the seal width SY in a substantially semicircular shape having a radius R2 of 8.5 mm centering on the position A. Thus, the overhang portion was formed so that the maximum overhang dimension H from the inner side of the thermally bonded portion of the seal width SY was 12 mm, and a three-sided seal bag with one side opened. Meat balls (85 g / bag) were filled in the three-side sealed bag, and the inside of the bag was evacuated, and then the opening was thermally bonded to produce 50 bags. This was heated in a microwave oven (rated high-frequency output 500 W) for 90 seconds. After the heating of all 50 bags has started, 30 to 50 seconds later, the internal pressure rises, so that the overhanging portions are peeled off and the internal pressure escapes from the circular cutout, so that cooking can be performed without breaking the bag, and the meat can be cooked. The taste of the ball was not impaired.

  A 15 μm biaxially stretched polyamide film and a 50 μm non-stretched film made of a mixed resin of a crystalline propylene-ethylene random copolymer / a high-pressure low-density polyethylene / ethylene propylene rubber in a ratio of 58/40/2 by weight are used. Using a two-component reactive polyurethane-based adhesive, a laminate was prepared by laminating the laminate by a well-known dry lamination method, and the unstretched films of the laminate were overlapped with each other. As shown in FIG. A long side T is cut into a rectangular shape having a length of 170 mm, and a radius R1 centered on a position A having a dimension CY from an edge of the short side of 13.5 mm on a half line of the short side Y is 3.5 mm. A notch is formed by punching out one of the laminates superimposed in a circular shape, and then the long side is formed on the side where the seal width ST is 8 mm from the edge of both long sides and the circular notch is formed. A heat bonding portion is formed with a seal width SY of 10 mm from the edge of the short side, and is connected to the heat bonding portion of the seal width SY in a substantially semicircular shape having a radius R2 of 8.5 mm centering on the position A. Thus, the overhang portion was formed so that the maximum overhang dimension H from the inner side of the thermally bonded portion of the seal width SY was 12 mm, and a three-sided seal bag with one side opened. A hamburger bag (75 g / bag) was filled in the three-side sealed bag, and the inside of the bag was evacuated and then the opening was thermally bonded to produce 50 bags. This was heated in a microwave oven (rated high-frequency output 500 W) for 90 seconds. When the internal pressure increases after 30 to 50 seconds from the start of heating for all 50 bags, the overhanging portions are peeled off and the internal pressure escapes from the circular notch and the bag can be heated and cooked without breaking the bag. The taste was not impaired.

It is a top view of a 1st embodiment of a package concerning the present invention. It is sectional drawing of the XX line of FIG. FIG. 2 is a cross-sectional view taken along line XX of FIG. 1 during heating and cooking. It is sectional drawing of XX at the time of completion of heating cooking of FIG. It is a top view of a 2nd embodiment of a package concerning the present invention. It is sectional drawing of the YY line of FIG. It is a top view of a 3rd embodiment of a package concerning the present invention. It is sectional drawing of the MM line of FIG. It is a top view showing one example of a package concerning the present invention.

Explanation of reference numerals

1, 1 ', 1 "packaging bag 2, 2' thermal bonding part 3, 3 ', 3" overhanging part 4, 4', 4 "notch 5 back seal part 6 back part 40 peeling part 50 laminated body 51 inner layer 53 outer layer

Claims (4)

In a package in which a packaging material made of a heat-adhesive resin layer is sealed in a heat-bonding portion on an inner layer, the package is connected to the heat-bonding portion from an inner peripheral portion of the heat-bonding portion and protrudes to the inside of the package. A package having at least one protruding portion thermally and thermally bonded, wherein a cutting blade or notch is formed in the protruding portion. The package according to claim 1, wherein the cutting blade or the notch is formed so as to penetrate a packaging material forming the overhang. 2. The package according to claim 1, wherein the cutting blade or the notch is formed on one of the facing packaging materials constituting the overhang. 3. The package according to any one of claims 1 to 3, wherein the overhang portion is formed on a side of the package in the package.