JPH0232976A - Packaging material, and container and packaging bag using said packaging material - Google Patents

Abstract

PURPOSE:To contrive the prevention of the breakage and deformation of a container by forming partial releasing strips on the surface of a film whose one end extends to the edge thereof and air holes passing through the film and the partial releasing strips and using a contacting surface between the partial releasing strips and adhesive layers as a gas passageway to allow its passage under a predetermined pressure. CONSTITUTION:The surface of packaging base film 11 formed of resin such as PE (polyethylene) is continuously coated with strips of releasing agents extending to the edges of the film 11 at intervals along the length and width thereof and these coats are baked, thereby forming partial releasing strips 12. Air holes 15 are formed in these releasing strips of the film 11 passing therethrough. An upper film 14 formed of resin such as PET (polyester) is adhered to the film 11 using adhesive layers 13 between the partial releasing strips 12 of the film 11 to thereby form a laminate film 10. A contacting surface between the partial releasing strip 12 and the adhesive layer 13 provides a gas passage surface 16 for allowing the passage of the gas generated in a container. In this example, the width of the partial releasing strips 12 and the thicknesses of these two films are such as to allow the passage of the gas in the container at least at one atmospheric pressure.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to packaging materials for wrapping or covering contents such as foods or containers containing contents, and in particular, when the contents are heat sterilized, cooked, or preserved, the increase in internal pressure of gas generated from the contents The present invention relates to a packaging material that can prevent the rupture and deformation of packaging materials and containers and spillage of contents, and containers and packaging bags using the packaging materials.

[Conventional technology]

Conventionally, there are many type N packaging materials and containers such as films that seal the contents of food and other foods, but after storing food prepared at home by freezing, etc. If you package the product or cover the opening of the container containing the contents with the film and heat sterilize or cook with microwaves, the gas generated from the contents will damage the film and the container. The pressure increases and the film or container may become deformed or
Various measures have been proposed to prevent this from happening, such as bursting and scattering of the contents. For example, in Maruba Utility Model Publication No. 125766/1983, a low melting point resin film is attached to the back side of a film made of a heat resistant film with ventilation holes, and the film is laminated to the opening of the main body of a heat resistant container. A container is disclosed. When heated using this container, the low melting point resin film softens, expands outward from the hole in the first film due to the pressure inside the container, ruptures, opens the hole, and lowers the internal pressure, preventing the container from bursting. It is meant to be prevented. There is also a container lid with a small hole partially covered with an R4 membrane, and when the internal pressure of the container increases due to heating, the thin film breaks down and lowers the archaic internal pressure. Further, in JP-A-62-235080, in a sealed container having a peelable heat-sealing band, at least one portion of the heat-sealing band is formed to protrude inwardly of the container, and the protrusion is The outer edge of the heat-sealing band corresponding to t!, which is located closest to the inside of the container, connects the protrusion formation starting point on the inner edge of the container. A sealed container for heating and cooking is disclosed which is formed inward of the container from the line. This is to prevent the container from bursting or deforming by concentrating stress on the protrusions of the heat-sealing band to partially open the container when the pressure inside the container increases.

[The problem to be resolved by the invention]

A film in which a low melting point resin film is laminated on the back side of a film provided with ventilation holes as in the conventional Japanese Utility Model Application Publication No. 62-125766, a film in which the ventilation holes of the first film are blocked with a thin film, and a container provided with the same means. Although the purpose of lowering the internal pressure can be achieved in a container covered with a lid, the increase in internal pressure due to heating causes the vent hole to burst open, causing the contents to scatter. In addition, it expands or ruptures due to an increase in internal pressure, making it impossible to reuse it. Furthermore, the container disclosed in Japanese Patent Application Laid-Open No. 62-235080 is a container having a heat seal band formed thereon, and its use is limited to industrial food packaging processes. Furthermore, for the reasons mentioned above, in any of the above films and containers, if the contents are stored and sealed and then sterilized under conditions where a certain pressure is reached by heating, the ventilation holes will be open to the outside air, and the containers will be marketed in a sealed state. It is not possible to ship the product to Furthermore, depending on the contents, there are foods such as coffee beans that tend to generate odor and gas even at room temperature.
Since the temperature does not reach the melting point, the vent holes do not penetrate and the gas cannot be released, and on the other hand, after the generated gas is released, the contents cannot be isolated from the outside air. The present invention deals with odors generated from the contents, gases such as water vapor, and an increase in internal pressure due to expansion of air, etc., when contents such as foods are stored and stored by heat sterilization, cooking, or simply packaging. An object of the present invention is to provide a packaging material that can prevent rupture and deformation of a container and the contents from boiling over, and can be reused depending on the application, as well as a container and a packaging bag using the packaging material.

[Means for Solving Problem 1] In the packaging material of the present invention, partial peeling is performed in which a release agent is continuously applied in a strip on the surface of one film 11 such as a resin.
A belt 12 is formed, and at least one part of the partial release band 12 is provided on the end face of the one film 11, and a ventilation hole 15 is provided that penetrates the one film 11 and the partial release band 12. Another film 14 such as resin is laminated to the partial release band 12 side of the first film 11 provided with ventilation holes 15 via an adhesive layer or a resin layer, and the contact surface with the partial release band 12 is heated to 1 atm or more. It is formed as a gas passage surface 16. As another packaging material, ventilation holes 15 are provided on the surface of one film 11 in the form of a plate or film made of metal, composite paper, resin, etc., and a release agent is applied in the form of a strip on the surface of the other film 14 made of resin, etc. A continuous partial release band 12 is formed, and at least one part of the partial release band 12 is provided so as to face the end surface of the other film 14, and the air hole 15 is provided on the surface of the first film 11. The other film 14 is laminated so that the surface of the partial release band 12 and the vent hole 15 are engaged, so that the contact surface with the release agent is formed as a gas passage surface of 1 atmosphere or more. Furthermore, it is effective to provide a plurality of partially peeled a-bands 12 in the form of squares, vertical stripes, horizontal stripes, etc., at equal intervals to increase the range of use. In the container 20 consisting of the container body 21 and the M22 covering the opening of the container body, the packaging material can be used as the container body or the lid. The packaging bag 30 can also be made by forming the laminated film 10 into a bag shape with the film side having ventilation holes as the innermost layer.

[Effect]

When the contents such as various foods are housed in the packaging material configured as described above, especially the laminate film 10, the customization 20, the packaging bag 30, etc. and heated in a microwave oven, for example, water vapor generated from the contents and Gases, such as odors, increase pressure within the container 20 or packaging material. When this pressure becomes 1 atm or more, the gas passes through the vent hole of one film, passes through the other film on the partial release zone, or the gas passage surface formed by spreading the first film, and passes through the other film. The film or film end face is released into the outside air, but when the pressure drops below 1 atmosphere, the gas passage surface is closed and the contents are released into the outside air; i! cut off

【Example】

Embodiments will be explained with reference to the drawings. First, the first embodiment of the packaging material is shown in FIG. A release agent is applied and baked onto the surface of one film 11 partially in a band shape and continuously up to the end surface of one film 11, thereby forming a partial release zone 12. A fine hole, that is, a ventilation hole 15 penetrating through the partial release band 12 of this first film 11 is provided, and a PET (polyester ), etc., to form a laminate film 10, which is an upper layer film 14 made of @4 resin. The partial release zone 12 of this embodiment is coated with silicone in a grid pattern using a so-called gravure roll coating device and baked. At this time, the surface of the metal roll dipped in the silicone coating liquid is first engraved in a grid pattern. Because
The entire surface of the first film 11 is coated with silicone in a continuous square pattern. Incidentally, W! is engraved on the surface of the metal roll in the form of a stripes or horizontal stripes on one film 11. It is also possible to apply silicone coating in the form of stripes or horizontal stripes. Furthermore, although a non-silicone release agent may be used as the release agent, the partial release zone 12 on the surface of the first film 11 is continuous, and at least one part of the continuous partial release zone 12 is located on the surface of the first film 11. The partially stripped cap 12 may have any shape as long as it faces the end face. However, the second wide film 1
In order to ensure that the partial release zone 12 always faces the surface of the first film 11m no matter where the film 1 is cut and used, the partial release band 12 has the above-mentioned square shape, vertical stripe shape, It is preferable that a plurality of stripes are arranged in a row at equal intervals, such as in the form of horizontal stripes. The contact surface between the partial release band 12 and the resin layer or adhesive layer 13 becomes a gas passage surface 16 that allows gas generated in the container to pass through, which will be described later. In addition, by changing the material and thickness of the other film 14, the withstand pressure against the pressure of the gas inside the container can be changed, so that the gas inside the container can pass through at atmospheric pressure, 1 atm or more. Further, the material of the first film 11 may be any material having normal strength with a certain degree of water resistance, and various plastics, metals, composite papers, or laminate films thereof may be used. In order to make the material suitable for cooking using microwave irradiation in a microwave oven, etc., it is necessary to select a material that transmits microwaves and can withstand heating, as in the above example. If the film is heated using a hot wand roller or a film with different stretching ratios, it will be easy to form a gas passing surface by heating and gas generation, causing the film to swell and rise. If you want to heat-seal a lid made of the packaging material of the present invention to the container body using the packaging material of the present invention, which is made of metal as a film, the heat-sealing surface is laminated with a resin having thermal adhesive properties.Next, The second embodiment of the packaging material of the present application will be described with reference to FIG. 1(C), omitting the same parts as the first embodiment.
A plurality of ventilation holes 15 are provided on the surface of one film 11, while a partial release band 12 continuous to the end face of the other film 14 is partially applied and baked on the surface of the other film 14. A film 11 provided with the ventilation holes 15
The other film 14 is laminated on the surface and a partial release band 120 is formed.
The surface and the ventilation hole 15 are arranged to face each other. A laminate film consisting of one film 11 and another film 14 of the above-mentioned packaging materials can be used for packaging around contents such as various foods, as shown in FIG. It can be used by covering the opening of a microwave container. Next, a container using the above-mentioned packaging material will be described with reference to FIG. 3. The container 20 covers a container body 21 and an opening of the container body 21 in order to accommodate contents such as various foods. As shown in the figure, a laminate film 1 made of the packaging material of the present application is attached to the lid 22.
As shown in FIG. 4, the laminate film 10 made of the packaging material of the present application is heat-sealed into a cylindrical shape with a film having ventilation holes as the inner layer. Then mold it into a bag shape.
The packaging bag 30 can also be formed by heat sealing the mating ends. Forming multiple edges of the film improves gas release properties, but since it is sufficient that at least one partial release zone 12 faces the edge of the film, there is no problem even if - sheets of film are formed into a bag shape. Next, we will explain the effect when the laminate film 10, container 20, and packaging bag 30 that wrap or contain contents such as various foods are heated and cooked, for example, in a microwave oven. Gases such as water vapor and odors are generated, and the air inside the container expands, increasing the pressure inside the container. When this pressure reaches 1 atmosphere or more, the gas passes through the vent hole 15, and the air inside the container expands. Since the contact surface between the partial release zone 12 and the other film in B) can be peeled off, the gas slightly lifts the other film 14 due to pressure, and the contact surface becomes the gas passage surface 16 and passes through the core, It is released to the outside from the gas passage surface 16 extending to the end surface of the packaging material of the present invention.For example, in FIGS.
The gas that has passed passes through the partial separation zone 12 as shown by the arrow.
and the adhesive layer 13, and is discharged from the end face of the packaging material to the outside air. Items wrapped with contents, lids, or packaging bags are shown in Figures 2 to 4.
As shown in the figure, gas is released from the end face of the laminate film 10. Next, when it is cooled and the internal pressure becomes 1 atm or less, the gas passage surface 16 (closes) and blocks the contents from the outside air. The increased internal pressure due to the expansion of air or gases such as water vapor and odor generated from the contents is continuously distributed from the ventilation hole provided in one film to the end surface of one film. It passes through the gas passage surface between the partial release band and another film or one film, and is released into the outside air from the edge, preventing the container or film from bursting or deforming, or the contents from spilling over due to the container bursting. Furthermore, when the internal pressure is released as described above, the gas passage surface is closed and returns to its original state, so it can be reused depending on the usage conditions, such as when packaging coffee beans. It has a wide range of uses and is very economical.Depending on the contents, after the contents are contained and sealed, they are sterilized by heating such as microwave irradiation at an internal pressure of 1 atm or more, and then the gas can pass through. The surface closes and returns to its original state, blocking it from the outside air, so it can be shipped to the market in a sealed state.Also, firstly, multiple partial release strips are provided in the form of mesh, vertical stripes, horizontal stripes, etc. at equal intervals, and then By making the film into a film form, the partially peeled strip faces the edge of the packaging material no matter where the wide packaging material is partially cut, increasing the range of use and making it possible to use it economically and effectively. Furthermore, even if a container or packaging bag made of the packaging material of the present invention contains contents such as coffee beans or other foods that tend to generate odor and other gases even at room temperature, the gases generated will be released to the outside air at room temperature. The laminate film is then sealed off from the outside air and has a preservation effect.Also, the laminate film using the packaging material of the present invention can be used as a lid material for a microwave oven container by pre-crimping and heat-sealing the container. Needless to say, it can be easily used at home in the same way as conventional cling film, and can also provide a steaming effect on the contents.

[Brief explanation of the drawing]

FIG. 1(A) is a partial plan view of the packaging material of the first embodiment of the present invention, FIG. 1 fB) is a cross-sectional view taken along line AA in FIG. 1(A), and FIG. FIG. 1(D) is a partial cross-sectional view of the packaging material of the second embodiment, and FIG. 1(D) is a cross-sectional view of the gas passage surface showing the gas release state of the present invention. FIG. 2 is a perspective view of the packaging material being a laminated film, and FIG. 3 is a container, and FIG. 4 is a perspective view of a packaging bag. 10... Laminate film 11... First film 12... Partial release zone 13... Adhesive layer (resin layer) 14... Other film 15... Ventilation hole 16...
・Gas passage surface 17...Contents 20...Container 21
・Container body 22...'M 30・Packaging bag Patent applicant Kite Chemical Industry Co., Ltd.

Claims (9)

[Claims] (1) In a packaging material formed by laminating one film with another film, a release agent is continuously applied in a band shape to the surface of one film to form a partial release zone, and at least one of the partial release zones is A vent hole is provided to face the end face of the film, and a ventilation hole is provided that passes through the first film and the partial release zone, and the contact surface with the partial release zone is formed as a gas passage surface of 1 atmosphere or more. and packaging materials. (2) In a packaging material made by laminating one film with another film, ventilation holes are provided on the surface of one film, and a partial release zone is formed by continuously applying a release agent in a strip shape on the surface of the other film. , at least one part of the partial release zone is provided so as to face the end surface of the other film, and the other film is provided on the surface of the one film provided with the ventilation hole, and the surface of the partial release zone and the ventilation hole are provided. A packaging material characterized in that the material is laminated facing each other and the partial release zone is formed as a gas passage surface having a pressure of 1 atm or more. (3) The packaging material according to claim 1 or 2, wherein a plurality of partial release bands are provided in the form of squares, vertical stripes, or horizontal stripes at equal intervals. (4) The packaging material according to claim 1 or 2, wherein the one or other film is a laminate film. (5) The packaging material according to claim 1 or 2, wherein the one film and the other film have different coefficients of thermal expansion. (6) The packaging material according to claim 1 or 2, wherein the one film and the other film have different stretching ratios. (7) A container consisting of a container body and a lid covering an opening of the container body, wherein the container body or the lid is made of the packaging material according to claim 1 or 2. (8) A packaging bag made of the packaging material according to claim 1 or 2, wherein one film of the laminate film having ventilation holes is formed into a bag shape as the innermost layer. (9) The packaging material, container, or packaging bag according to claim 1, 2, 7, or 8, wherein the packaging material, container, or packaging bag is for heating in a microwave oven.