JP2011173618A - Packaging film material and storage vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging film used for sealing the opening of a packaging bag or a vessel and can easily properly prevent the inner pressure of the packaging bag or the vessel from superfluously rising when a content of the sealed packaging bag or vessel is heat-treated in a microwave oven or the like with the content stored in the packaging bag or vessel. <P>SOLUTION: In the packaging film 10 made by pasting a sealant film 13 on the back surface of a surface film 11, there is mounted an air vent hole-forming cut 14 penetrating a part of the surface film but not penetrating the sealant film. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a packaging film material used for a packaging bag for containing food or the like, a sealing sheet material for sealing an opening of a container containing food or the like, and the opening is sealed with the packaging film material. The present invention relates to a storage container. In particular, the present invention relates to a packaging film material that can be suitably used when heat treatment is performed using a microwave oven or the like in a state where food or the like is accommodated, or heat sterilization is performed using a heating device or the like in a state where a medical instrument or the like is accommodated. Is.

  Conventionally, contents such as various foods and processed foods are sealed in a packaging bag made of a packaging film material, and after such contents are accommodated in a container. There are many products in which the opening of this container is sealed with a packaging film material.

  In recent years, as described above, the contents sealed in a packaging bag or container are heat-treated using a microwave oven or the like as they are, or as described above. After the contents are stored in a refrigerator or frozen, they are subjected to heat treatment using a microwave oven or the like as they are.

  Here, if the contents are sealed and accommodated in a packaging bag or container as described above and heat-treated using a microwave oven, etc., the contents are for packaging by water vapor generated from the contents etc. The internal pressure in the bag or the container is excessively increased, so that the packaging film material constituting the packaging bag and the packaging film material that seals the opening of the container are swollen and ruptured and stored. There was a problem that the contents were scattered outside.

  For this reason, as shown in Patent Document 1, an air vent hole is provided in a container or bag body that stores food, and a sealing member that seals the air vent hole is detachably attached so that food can be stored in the container or bag body. When a food is heat-treated using a microwave oven or the like in such a state, a device in which a sealing member that has sealed the air vent hole is removed has been proposed.

  However, as described above, an air vent hole is provided in the container or bag body, and a sealing member is detachably attached to seal the air vent hole, or when the food is heated using a microwave oven or the like, the air vent hole is not provided. It is troublesome to remove the sealing member that has been sealed, and there is a problem that if the forgetting to remove the sealing member, the contained food is scattered outside.

  Moreover, as shown in Patent Document 2, in a microwave oven packaging bag in which a plastic laminate film is bent and sealed by heat sealing, a narrow silicone agent layer is formed on a part of the heat sealing portion. Has been proposed to form an easy peeling zone in which a vapor escape hole is formed when a predetermined vapor pressure is reached.

  However, it is troublesome to provide a narrow silicone agent layer in a part of the heat seal portion in this way, and the manufacturing cost is high, and a large steam escape hole is opened when heat treatment is performed using a microwave oven or the like. There is a problem that the contained contents are scattered to the outside, and the silicone in the silicone agent layer evaporates and adheres to the contents.

  Furthermore, as shown in Patent Document 3, a low-melting-point heat sealant or a release agent is applied to a required portion of a synthetic resin stretched film, and cut into a synthetic resin stretched film by a line or a broken line passing through the applied portion. A packaging material has been proposed in which a line is engraved and a heat-sealable synthetic resin-made unstretched film is attached to the synthetic resin-made stretched film.

  However, as described above, a low-melting point heat sealant or release agent is applied to the required part of the synthetic resin stretched film, and a cut line is engraved on the synthetic resin stretched film with a line or a broken line passing through the applied part. The operation of attaching a heat-sealable synthetic resin unstretched film to the synthetic resin stretched film is troublesome and has a problem of high manufacturing costs.

  Moreover, in this patent document 3, a bag body is formed so that the synthetic resin-made unstretched film in the above-mentioned packaging material is inside, and a microwave oven or the like is used in a state where food or the like is sealed in the bag body. When the heat treatment is performed, the stretched film made of synthetic resin is largely cut along the cutting line in the application portion of the low melting point heat sealant or release agent, and accordingly, the low melting point heat sealant or release agent Small holes for removing steam are formed in the unstretched synthetic resin film at both ends of the cutting line passing through the coating portion, and the internal pressure in the bag is adjusted.

  However, this packaging material is not only complicated in construction and troublesome to manufacture, but also after the synthetic resin stretched film is largely cut along the cutting line as described above, it is not always necessary to use a low-melting heat sealant or a peeling agent. At both ends of the cutting line that passes through the coating part of the agent, it cannot be said that a small hole for removing steam is appropriately formed in the unstretched film made of synthetic resin, and there is still a possibility that the internal pressure rises and bursts. .

Japanese Utility Model Publication No.59-55170 JP-A-9-40032 International Publication No. WO01 / 082011

  The present invention solves the above-described problems in a packaging film material used for a packaging bag for containing food and the like, and a packaging film material used for sealing an opening of a container containing food and the like. This is a problem.

  That is, in the present invention, contents such as various foods and processed foods are accommodated in a packaging bag composed of a packaging film material, or such contents are accommodated in a container. In addition, the container with the opening portion of the container sealed with a packaging film material is heated as it is using a microwave oven or the like, or the one containing the contents as described above is refrigerated or frozen. In the case of heat treatment using a microwave oven or the like as it is, the inside of the packaging bag or the container sealed with the packaging film material by water vapor generated from the contents etc. It is an object of the present invention to provide a packaging film material that can easily and appropriately prevent an excessive increase in internal pressure.

  In the present invention, in order to solve the above-described problems, in a packaging film material in which a film for sealant is attached to the back side of a surface film, a cut for forming an air vent hole penetrating a part of the surface film Was provided so as not to penetrate the sealant film.

  Here, in forming the cut for forming the air vent hole in the packaging film material as described above, when the heat treatment is performed using a microwave oven or the like, the air vent hole is appropriately formed in the packaging film material. In order to make the cuts, the cuts are formed so as to cross each other, or the cuts are cut in a V shape from the surface film toward the sealant film, and further, the cuts extend from the surface film to the middle of the sealant film. It is preferable to cut to a depth.

  Moreover, in the packaging film material of the present invention, it is preferable to use a film having a different thermal expansion coefficient for the surface film and the sealant film, and the surface film is composed of a stretched film having a low coefficient of thermal expansion. In addition, it is preferable that the sealant film is composed of a film having heat sealability.

  Moreover, in the storage container of this invention, it was made to seal an opening part by said packaging film material.

  In the present invention, in the packaging film material in which the sealant film is adhered to the back side of the surface film as described above, the notch for forming the air vent hole penetrating a part of the surface film is used as the sealant film. Since it was provided so as not to penetrate, the contents such as various foods and processed foods were accommodated in a packaging bag composed of the packaging film material, or such contents were accommodated in the container. Thereafter, when the opening of the container is sealed with a packaging film material, the above contents are accommodated in a properly sealed state in the packaging bag or container.

  And when the contents are thus housed in the packaging bag or in the container, when the heat treatment is carried out using a microwave oven or the like, the water vapor generated from the contents or the like causes the inside of the packaging bag. When the internal pressure in the container sealed with the packaging film material rises, the stress concentrates on the above-mentioned cut portion formed so as to penetrate a part of the surface film due to this pressure. The corresponding portion of the sealant film is cut to form an air vent hole that penetrates the surface film and the sealant film.

  As a result, the container containing the contents in the packaging bag made of the packaging film material of the present invention, or the contents contained in the container and the opening portion sealed with the packaging film material of the present invention When the storage container is heated as it is using a microwave oven or the like, water vapor generated from the contents etc. is appropriately discharged to the outside through the air vent hole, and the inside of the packaging bag or the packaging film The internal pressure in the container sealed with the material is prevented from excessively rising, and the packaging film material constituting the packaging bag and the packaging film material sealing the opening of the container are swollen and burst. This prevents the contents contained in the packaging bag or the container from being scattered outside.

  Moreover, in the film material for packaging of the present invention, when forming the notch for forming the air vent hole as described above, if the notch is formed so as to intersect, the stress accompanying the increase in internal pressure causes the notch to intersect. A small air vent hole is easily and properly formed by concentrating on the portion to be performed.

  In addition, if the above cut is cut in a V shape from the surface film to the sealant film, a small air vent hole is easily formed at a position corresponding to the tip of the V cut as the internal pressure increases. And it comes to be formed appropriately.

  Furthermore, when the above-mentioned cut is made to a depth from the surface film to the middle of the sealant film, an air vent hole is easily and appropriately formed in the part of the sealant film along with an increase in internal pressure. become.

  Moreover, in the packaging film material of the present invention, when the surface film and the sealant film having different thermal expansion coefficients are used, when the heat treatment is performed using the microwave oven or the like as described above, the internal pressure increases. Stress is also generated at the interface between the surface film and the sealant film, and the portion of the sealant film corresponding to the cut portion is appropriately cut to form an air vent hole penetrating the surface film and the sealant film. Become so.

  Further, when the above surface film is composed of a stretched film, the surface film sufficiently suppresses the expansion of the packaging film material during the heat treatment, and the packaging film material does not swell greatly. When a hole is formed and the film for sealant is composed of a heat-sealable film, the packaging film material of the present invention is heat-sealed to form a packaging bag, or an opening portion of a container It can be easily attached to the container so as to be sealed.

In the packaging film material which concerns on one Embodiment of this invention, it is sectional explanatory drawing which showed the state which stuck the film for sealants on the back surface side of the surface film. In the packaging film which concerns on said embodiment, it is the plane explanatory view which showed the state which provided multiple pairs of crossing notch which became X shape on the surface of the surface film. In the packaging film which concerns on said embodiment, it is a plane explanatory drawing of the example of a modification which provided a pair of notches which consist of a C-shaped curve on the surface of a surface film toward the opposite direction, and provided two or more. is there. In the packaging film which concerns on said embodiment, it is a plane explanatory view of the example of a change which provided multiple cuts which became linear on the surface of a surface film. In the packaging film which concerns on said embodiment, it is cross-sectional explanatory drawing which showed the state formed so that the V-shaped front-end | tip of a pair of crossed cut which became X shape might correspond. In the packaging film which concerns on said embodiment, it is the fragmentary perspective view which showed the state formed so that the V-shaped front-end | tip of a pair of crossing cut which became X shape might correspond. It is the schematic plan view which showed the state which sealed the opening part of the container which accommodated the contents, such as foodstuffs, with the packaging film which concerns on said embodiment. It is the schematic sectional drawing which showed the state which sealed the opening part of the container which accommodated the contents, such as foodstuffs, with the film for packaging which concerns on said embodiment. A pair of crossed V-shaped cuts that are X-shaped when the opening of the container containing the contents such as food is heat-treated in a state of being sealed with the packaging film according to the above embodiment It is sectional explanatory drawing which showed the state in which an air vent hole is formed in the position corresponding to the part which the front-end | tip which became a shape corresponds. It is a schematic sectional drawing of the packaging bag by which the one side manufactured using the packaging film which concerns on said embodiment was opened. It is a schematic plan view of the packaging bag shown in FIG. It is the schematic sectional drawing which showed the state which accommodated the contents in the packaging bag shown in FIG. It is the schematic sectional drawing which showed the state which accommodated the contents in the packaging bag shown in FIG. 10, and sealed the packaging bag.

  Hereinafter, the packaging film material according to the embodiment of the present invention will be specifically described. Note that the packaging film material according to the present invention is not particularly limited to those shown in the following embodiments, and can be implemented with appropriate modifications within a range that does not change the gist thereof.

  As shown in FIG. 1, the packaging film material 10 of this embodiment is configured by adhering a sealant film 13 to the back side of a surface film 11 with an adhesive layer 12.

  Here, film materials having different coefficients of thermal expansion are used for the surface film 11 and the sealant film 13 described above.

  And as said surface film 11, it is preferable to use what was not easily extended with heat | fever etc., and was excellent in processing characteristics, such as printing and lamination | stacking, Generally, it is made to use the film which extended | stretched, and specifically, Is a stretched polyethylene terephthalate film, polyacrylonitrile film, polypropylene film, polyester film or the like.

  On the other hand, the sealant film 13 has a higher coefficient of thermal expansion than the surface film 11 described above, and the packaging film material 10 is formed in a bag shape or attached so as to seal the opening of the container. In addition, it is preferable to use a material excellent in heat sealability. Generally, an unstretched film is used, and specifically, an unstretched polyethylene film, a polypropylene film, or the like is used.

  Further, the adhesive used for the adhesive layer 12 is preferably one that can appropriately bond the surface film 11 and the sealant film 13. For example, an adhesive such as polyurethane or polyethylene is used. Like that.

  Then, in the packaging film material 10 of this embodiment, when providing the notch 14 for forming an air vent hole penetrating a part of the surface film 11 as described above so as not to penetrate the sealant film 13, FIG. As shown in FIG. 2, a plurality of intersecting pairs of cuts 14 whose shape on the surface of the surface film 11 is X-shaped are provided at a necessary interval. However, the planar shape of the cuts 14 formed on the surface of the surface film 11 is not limited to this, and for example, as shown in FIG. 3, a pair of cuts 14 formed of a C-shaped curve are directed in opposite directions. It is also possible to provide the cuts 14 that are formed so as to intersect with each other or as shown in FIG.

  Here, in the packaging film material 10 of this embodiment, in forming the above-mentioned cuts 14 from the surface film 11 toward the sealant film 13, as shown in FIGS. Is cut from the surface film 11 toward the sealant film 13 so as to be V-shaped, and the tip of each V-shaped cut 14 penetrates the surface film 11 to an appropriate depth of the sealant film 13. It is made to be cut. Further, in the pair of intersecting cuts 14 that are X-shaped as described above, the V-shaped tips 14a of the respective cuts 14 are made to coincide with each other. In this embodiment, the notch 14 having a V-shaped tip is provided from the surface film 11 to the sealant film 13, but the notch 14 having a straight tip is provided. It is also possible to provide a notch 14 whose depth only penetrates the surface film 11 and does not reach the sealant film 13.

  Next, the example which uses the film material 10 for packaging of this embodiment is demonstrated based on an accompanying drawing.

  Here, as shown in FIG. 7 and FIG. 8, when the contents A such as food are accommodated in the container 20 and the opening portion of the container 20 is sealed with the packaging film material 10, the notches 14 are formed. With the surface film 11 formed above, the sealant film 13 is adhered to the flange 21 around the opening of the container 20 by heat sealing or the like. In this case, in the packaging film material 10, the notch 14 does not penetrate the sealant film 13, so that the content A is stored in a properly sealed state in the container 20. become.

  When the opening portion of the container 20 containing the content A is sealed with the packaging film material 10 as described above, when this is heat-treated with a microwave oven or the like, water vapor generated from the content A or the like The internal pressure in the container 20 rises due to the above and the like, and the packaging film material 10 is slightly expanded. However, the excessive expansion of the packaging film material 10 is suppressed by the stretched surface film 11.

  As a result, stress is generated in the packaging film material 10, and stress is also generated at the interface between the surface film 11 and the sealant film 13 having different coefficients of thermal expansion. As shown in FIG. 9, the sealant film 13 corresponding to the tip 14a has a portion of the sealant film 13 as shown in FIG. It cut | disconnects and the air vent hole 15 which penetrates the surface film 11 and the film 13 for sealants comes to be formed.

  Then, through the air vent hole 15 formed so as to penetrate the surface film 11 and the sealant film 13 in this way, water vapor or the like in the container 20 is discharged to the outside, and is sealed by the packaging film material 10 to be sealed in the container 20. The internal pressure in the inside is prevented from excessively rising, the packaging film material 10 is not swollen and ruptured, and the contents A contained in the container 20 are not scattered outside.

  Further, in using the packaging film material 10 as the packaging bag 30, as shown in FIGS. 10 and 11, the sealant film 13 in the packaging film material 10 faces, Wrapping the packaging film material 10 or stacking the two packaging film materials 10 and bonding the three sides of the packaging film material 10 by heat sealing or the like to provide a sealing portion 31 to manufacture a packaging bag 30 with one side opened. To do.

  Then, as shown in FIGS. 12 and 13, after the contents A are accommodated in the packaging bag 30 from the opened side of the packaging bag 30, the opened side is adhered by heat sealing or the like. The sealing part 31 is provided and the packaging bag 30 containing the contents A is sealed.

  When the contents A are accommodated in the packaging bag 30 in this way, in the packaging film material 10 described above, since the notches 14 do not penetrate the sealant film 13, the contents A are packaged. The bag 30 is accommodated in a properly sealed state.

  When the content A is contained in the packaging bag 30 as described above and this is heat-treated with a microwave oven or the like, the internal pressure in the packaging bag 30 is increased by water vapor generated from the content A or the like. However, excessive expansion of the packaging film material 10 is suppressed by the stretched surface film 11, thereby causing stress in the packaging film material 10, as in the case of the container 20, Stress concentrates on the portion where the V-shaped tips 14a of the pair of intersecting cuts 14 formed in an X shape coincide with each other, and as shown in FIG. 9, the sealant film 13 corresponding to the tip 14a portion. This portion is cut to form an air vent hole 15 penetrating the surface film 11 and the sealant film 13.

  And the water vapor | steam etc. in the packaging bag 30 were discharged | emitted outside through the air vent hole 15 formed so that the surface film 11 and the sealant film 13 might be penetrated in this way, and it was formed of the packaging film material 10 The internal pressure in the packaging bag 30 is prevented from excessively rising, and the packaging film material 10 is not expanded and the packaging bag 30 is not ruptured. No longer scatters outside.

  In the packaging bag 30 described above, the notch 14 is provided in the packaging film material 10 on both sides thereof, but the notch 14 may be provided only in the packaging film material 10 on one side.

DESCRIPTION OF SYMBOLS 10 Film material for packaging 11 Surface film 12 Adhesive layer 13 Film for sealant 14 Notch 14a Tip of notch 15 Air vent hole 20 Container 21 Ridge part 30 Packaging bag 31 Seal part A Contents

Claims (7)

  In the packaging film material in which the film for sealant is adhered to the back side of the surface film, a notch for forming an air vent hole that penetrates a part of the surface film is provided so as not to penetrate the film for sealant. Characteristic packaging film material.   The packaging film material according to claim 1, wherein the slits for forming the air vent holes are formed so as to intersect with each other.   The packaging film material according to claim 1 or 2, wherein the cut for forming the air vent hole is cut in a V shape from the surface film toward the sealant film. Film material.   The packaging film material according to any one of claims 1 to 3, wherein at least a part of the cut for forming the air vent hole is cut to a depth from the surface film to the middle of the sealant film. A film material for packaging, characterized in that   The packaging film material according to any one of claims 1 to 4, wherein the surface film and the sealant film have different coefficients of thermal expansion.   The packaging film material according to any one of claims 1 to 5, wherein the surface film is composed of a stretched film, and the sealant film is composed of a film having heat sealability. A film material for packaging, characterized in that   An opening container is sealed with the film material for packaging of any one of Claims 1-6, The storage container characterized by the above-mentioned.

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