JP2001180765A - Food packaging film and food package adaptable to microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an appropriate exhaustion of steam for a food package without requiring a complicated structure, and to make it recyclable. SOLUTION: A food packaging film 10 is formed as a laminated single resin film, and a heterogeneous printing part 18 in a specified planate shape is partially formed at the inside of a base film 12 with a heterogeneous ink having a synthetic resin material different from the resin used for the laminated film as one of ingredients thereof applied. Then, a food package 20 adaptable to microwave oven is formed with the heterogeneous printing part 18 of the food packaging film arranged at either one of end sides of the film with one end of the printing part hooked on the edge thereof and with heat sealing 22 for the end sides applied to the edge and a position opposite thereto within a width excluding specified extensions 18a and 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food packaging film suitable for hermetic packaging of foods cooked by a microwave oven or the like, and a bag or container formed by using the food packaging film. The present invention relates to a food package.

[0002]

2. Description of the Related Art For example, frozen foods, chilled foods, and the like, in which various processed foods are packaged and sealed in a bag or a container formed from a food packaging film, or the like.
In addition, room temperature foods and the like (hereinafter referred to as frozen foods and the like) have been widely provided in recent years with the spread of microwave ovens and the like in general households.

[0003] Here, the degree of sealing of the package in which the food is packed is high, and when the frozen food or the like is directly heated in a microwave oven,
Since there is a risk that the package may expand and burst under the rise in internal pressure due to the steam generated from the food, generally, the food is heated after being taken out of the package, or the opening or hole for releasing steam. Consumers have been required to heat or the like after forming such as (steam vent holes) in the package.

[0004] However, since various operations at the time of such heating are relatively troublesome, a reduction in workability at the time of heating and cooking is inevitable. Guidance and precautions for various operations during heating are displayed, for example, as precautionary notes by printing, etc., but it is not clear under what conditions consumers cook under heat. Even if holes are formed, it cannot be asserted that there is no adverse effect on food due to excessive or insufficient steam release.

[0005] In view of the above, for example, various configurations have been provided in which degassing from the inside of the package can be appropriately secured in accordance with the progress of heating and cooking using a microwave oven or the like. And
As such a configuration, for example, a weak seal portion is provided in a part of the heat seal portion, and steam is released to the outside under the peeling of the weak seal portion due to an increase in internal pressure, that is, degassing is possible. JP-A-63-277750 and JP-A-09-0400
A configuration disclosed in Japanese Patent Publication No. 30 and the like, and a heating element that absorbs microwaves and generates heat in a part of the heat seal portion to form a deaeration path by destruction of the portion due to heat generation.
No. 01-116186, and the structure disclosed in Japanese Utility Model Laid-Open No. 01-168481, etc., or a part of a layer of a multilayer food packaging film is provided with a degassing path, and the degassing path absorbs microwaves. Japanese Patent Application Laid-Open Publication No. H10-21078, in which a heating element that generates heat is disposed, and the inside of the package can be communicated with a degassing path by destruction of the portion due to heat generation.
The configuration and the like disclosed in JP-A-09-255050 are generally provided.

[0006]

However, in the configuration in which the weak seal portion is provided in a part of the heat seal portion, in other words, it can be said that the easily peelable portion is provided in the heat seal portion. It cannot be denied that the reduction in resistance to impact or the like is involved. That is, heating and cooking can be performed easily and appropriately, but there is a possibility that the function of sealing the food, that is, the function of protecting the hygiene of the food is reduced.

On the other hand, in a configuration in which a heating element is provided in a part of a heat seal portion or a part of a deaeration path, a high adhesive strength of the heat seal itself can be obtained, so that a decrease in sealing function can be sufficiently prevented. . However, since the microwave output of the microwave oven is not uniform, it cannot be denied that the microwave oven is inferior in compatibility with various conditions during heating and cooking.

Japanese Patent Application Laid-Open No. 09-315465 discloses a configuration in which a sealant film of a food packaging film is made of a combination of different types of resin materials, and the portions are thermally bonded by resin adhesive layers having different melting points. . According to this configuration, it is possible to secure formation of a deaeration path due to an increase in the internal pressure without lowering the adhesive strength of the heat seal and without being affected by the microwave output.

[0009] However, considering that layers of resin materials of different systems, that is, multilayer resin films having different types of synthetic resin layers, cannot be recycled and are discarded only as industrial waste, JP-A-09-
The configuration disclosed in Japanese Patent Publication No. 315465 is hard to say that it is preferable in view of recent waste disposal problems or environmental problems.

[0010] The present invention provides a food packaging film compatible with a microwave oven and a food packaging film compatible with a microwave oven, which can ensure proper vapor release without complicating the configuration and can also be recycled. The purpose is to provide used food packaging.

[0011]

According to the present invention, in order to attain this object, a food packaging film is of the same type as a base film laminated on the inner side of a base film on which a printing layer is provided. Are formed as a single resin-based laminated film in which a sealant film layer made of a synthetic resin material is bonded to a base film under fusion bonding. Then, under the application of a heterogeneous ink containing a synthetic resin material of a different system from the resin system of the laminated film as a component, a heterogeneous printing portion having a specific planar shape is partially formed on the printing layer on the inner surface of the base film. By forming and partially defining this heterogeneous printing part as a peelable weak adhesive area between the inner surface of the base film and the sealant film layer, the food packaging film for microwave oven of the present invention is formed. ing.

[0012] In addition, the heterogeneous printing portion of the food packaging film is disposed with one end hung on one edge at one of the edges, and the heat seal at the edge is opposed to the edge. The present invention is applied to a food package for a microwave oven as a form in which a predetermined extending portion is left in a position where the predetermined extending portion is left.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a food packaging film 10 compatible with a microwave oven according to the present invention comprises a base film 12.
Is formed as a laminated film in which a sealant film layer 14 is laminated on the inner surface of the substrate and bonded to each other.

Examples of the synthetic resin material of the base film 12 include polypropylene, polyamide (nylon) and polyester, and examples of the synthetic resin material of the sealant film layer 14 include polypropylene and polyester. Depending on the use of the food packaging film 10, that is, the type of food to be packaged, etc.
The synthetic resin material is appropriately selected.

The sealant film layer 14 only needs to have a thermoplastic resin layer which can be joined by thermal bonding called heat sealing on the outer side, that is, on the side opposite to the base film 12, so that the sealant film layer itself May be a single layer or a multilayer.

Here, when a base film and a sealant film layer made of different kinds of synthetic resin materials are bonded to each other, an adhesive or an anchor coat agent is usually used. For a laminated film formed by laminating and laminating resin films, or a laminated film laminated by an adhesive or an anchor coating agent, etc., disposal as non-recyclable industrial waste is required. . Therefore, in the present invention, a 14-layer sealant film made of the same type of synthetic resin material as the base film laminated on the inner surface side of the base film 12 was adhered to the base film under the fusion bonding. The food packaging film 10 is formed as a so-called single resin-based laminated film.

That is, for example, by laminating and bonding a sealant film layer 14 made of the same polypropylene-based resin material to a base film 12 made of polypropylene-based resin material,
10 is formed.

Such a single-resin laminated film formed as a combination of only the same kind of synthetic resin material without using a heterogeneous film or an adhesive, etc.
The recycling can be easily performed, and the disposal as industrial waste for each use can be reliably omitted.

In the embodiment of the present invention,
The food packaging film 10, for example, the base film 12
The following are embodied as a material formed by laminating and laminating the sealant film layer 14 by melt extrusion and a long substantially band-shaped material wound up by a predetermined core 16 as shown in FIG. .

When printing is performed on a laminated film, usually, a printed layer is formed by applying a predetermined ink on the inner surface of the base film, that is, on the surface where the sealant film layer is bonded. And since the printing layer on the inner surface of the base film forms a sealant film layer and becomes a part of the fusion bonding layer to the base film,
In the single-resin-based laminated film to be the food packaging film 10 of the present invention, the role as a fusion bonding layer is also imposed on the printed layer.

Here, in a single resin-based laminated film which does not use an adhesive or an anchor coat agent for bonding between the base film and the sealant film,
Base film, and to provide a melt adhesive layer made of a synthetic resin material of the same system as the sealant film layer,
Because it is a necessary condition to ensure a high adhesive strength, in general, the use of the same kind of ink having the same type of synthetic resin material as one component of the laminated film is used in a single resin-based laminated film. It is a major premise of printing. In other words, a heterogeneous ink containing a synthetic resin material of a different system from that of the laminated film as one component is inferior in adhesive strength, and therefore is not usually used for printing with a single resin-based laminated film.

However, in the present invention, attention is paid to the point that the adhesive strength of the heterogeneous ink is inferior, and as shown in FIGS. 1 and 2, the heterogeneous printing unit formed by applying the heterogeneous ink to the inner surface of the base film 12 is used. By partially providing 18 in a specific portion of the printing layer, this heterogeneous printing portion is defined and formed between the base film of the food packaging film 10 and the sealant film layer 14 as a peelable weak adhesive area. ing.

The heterogeneous printing section 18 is formed in a specific planar shape, and the planar shape may be, for example, a substantially trapezoidal shape as shown in FIG. And this heterogeneous printing department
Numerals 18 are arranged, for example, at regular intervals with respect to the substantially band-shaped food packaging film 10.

Here, although the adhesive strength in the heterogeneous printing section 18 is inferior to that of the printing section using another molten adhesive layer or the same kind of ink, the adhesion under a low adhesive strength is secured. In other words, unlike the release agent used to eliminate the mounting of the adhesive or the like on the inner surface of the base film 12,
According to the heterogeneous printing portion 18 made of the heterogeneous ink, the adhesion of the relevant portion can be obtained, so that unnecessary peeling between the base film and the sealant film layer 14 and deterioration of the appearance quality can be reliably achieved according to the present invention. Can be prevented.

It is preferable that the heterogeneous printing section 18 be colored. If the indication of the steam outlet is displayed in addition to the coloring, it is easy to prompt the consumer who cooks the food to pay attention.

As a food package 20 formed by using such a food packaging film 10, for example, a bag body having a so-called palm joint seal as shown in FIG. 3 can be exemplified. Such a bag with a closed seal (food packaging)
Reference numeral 20 denotes, for example, a sheet of food packaging film 10 that has been cut to a large size is folded under the inner surface arrangement of the sealant film layer 14, and between the side edges 10a thereof is heat-sealed to form a joint. By joining one of the end portions 20a and 20b, for example, the end portion 20a under a heat seal 22, the food is stored, that is, the bag is made into a packable bag (FIG. 4). (A)).

It is to be noted that the bag itself in the form of a jointed seal is well known, and the form itself of the bag is not the purpose of the present invention, so that the detailed description is omitted here.

Here, as shown in FIGS. 3 and 4 (A), in the food package 20 of the present invention, the heterogeneous printing unit 18 has, for example, one end at the edge at the edge 20a. It is arranged by hanging. In the present invention, the heat seal 22 of the edge 20a is provided within the width that leaves the predetermined extending portions 18a and 18b at the edge and the position facing the edge.

In such a bag-shaped food package 20, the food is hermetically sealed by heat-sealing the opened end 20b after storing and packaging the food. When the food package 20 in which the food is sealed is heated and cooked by a microwave oven or the like, steam is generated from the food due to the heating. Due to the increase in the internal pressure due to the steam pressure, the food package becomes the package shown in FIG. The force is concentrated on the joint by the heat seal 22 as shown in FIG.

By the way, as described above, the heterogeneous printing unit
In 18, since the adhesive strength between the base film 12 and the sealant film layer 14 is inferior to other parts, it is clear that the rigidity of the sealant film layer in that part is lower than the rigidity in other parts. It is. That is, under the expansion of the food package 20, when the internal pressure is concentrated toward the joint by the heat seal 22,
As shown in FIG. 5 (A), the sealant film layer 14 has an extension 18a of the heterogeneous printing unit 18 located in the food package.
Bursts at

As described above, when the sealant film layer 14 ruptures at the extension 18a of the heterogeneous printing section, the vapor inside the bag 10 tries to escape to the outside from the rupture hole 24 formed by the rupture. Under the steam force to escape, the base film 12 and the sealant film layer of the heterogeneous printing section 18 are peeled off. Further, since the different type printing unit 18 extends the extension parts 18a and 18b respectively on each side of the heat seal 22, that is, inside and outside of the food package 20 sandwiching the heat seal, the different type printing unit 18 Base film in printing section
12, when the sealant film layer 14 is peeled off, the inside and outside of the food package sandwiching the heat seal are communicated through a hollow deaeration passage 26 formed by this peeling, and thereby, The vapor inside the package is released to the outside.

That is, according to the food package 20, the internal pressure of the food package is released under the release of steam through the deaeration passage 26 which is naturally opened and formed in response to the progress of overheating. Can be maintained at a predetermined pressure, so that food cooking without rupture of the food package can be appropriately performed without any prior work.

As described above, according to the food package 20 for a microwave oven according to the present invention, since various preparatory operations are not required at the time of cooking, the operation at the time of cooking is reliably complicated. Can be prevented. And, since the bonding strength itself by the heat seal 22 is not reduced and the microwave output of the microwave oven is not affected, the sealing function of the food, that is, the deterioration of the hygiene protection function for the food is surely reduced. In addition to this, it is possible to reliably improve the performance of various conditions during heating and cooking.

Further, since the food packaging film 10 for a microwave oven according to the present invention, which forms the food packaging body 20, is formed as a single resin-based laminated film, it is used after use, that is, after consumption of food. The recycling of the food packaging in is possible. In other words, this recycling is expected to greatly contribute to measures against waste disposal problems centered on reduction of waste.

Since the food packaging film 10 only needs to be provided partially with the heterogeneous printing portion 18 made of the heterogeneous ink on the printing layer on the inner surface of the base film 12, the manufacturing process becomes complicated, and the structure is simplified. The complication of itself is surely prevented. Furthermore, according to the heterogeneous printing section 18 made of a heterogeneous ink, unlike the release agent layer formed by applying a release agent, since the adhesion of the relevant portion can be reliably obtained, the appearance quality is deteriorated due to unnecessary separation. It can be reliably prevented.

Here, in the embodiment of the present invention, a substantially trapezoidal shape is exemplified as the planar shape of the heterogeneous printing section 18, but any planar shape that can function as a degassing path when peeled off is used. Not limited to this, for example,
The heterogeneous printing unit may be formed in a square, a substantially circular shape, a substantially semicircular shape, or the like.

In the embodiment of the present invention,
As a form of the bag to be the food packaging body 20, a form of a gasket seal form made by a gasket seal is embodied, but is not limited thereto. For example, three sides of two laminated films are heat-sealed. Needless to say, the present invention can also be applied to a so-called three-side sealed bag body as shown in FIG.

In the food package 120 as a three-sided sealed bag, the food packaging film 10 of the present invention having the heterogeneous printing portion 18 is, for example, a front member 120-1.
As a backing member 120-2, a laminated film having no heterogeneous printing portion, for example, a single resin laminated film made of the same kind of synthetic resin material as a food packaging film, is formed under the inner surface arrangement of the sealant film layer 14. Are superimposed on each other. Then, one of the three sides is joined by the heat seal 22 to form one end, for example, the end.
The food package 120 is formed, that is, made into a bag with an open bag 120b.

In the food package 120 which is a three-sided sealed bag, the heterogeneous printing unit 18 is disposed, for example, with one end on the edge at the edge 120a. The seal 22 is provided within the width that leaves the predetermined extending portions 18a and 18b at the edge and the position facing the edge, respectively (see FIG. 4A).

Even in such a configuration, a food package
If 120 expands, the force concentrates on the joint by the heat seal 22, so that the extension 18 a of the heterogeneous printing unit
Is obtained. And, by the escape of the vapor from the rupture hole 24, the base film 12,
Under the peeling between the sealant film layers 14, since the hollow deaeration path 26 can be appropriately formed, the same effect as the above-described bag form can be obtained in the food package 120 which is a three-side sealed form bag. (See FIGS. 5A and 5B).

Further, the present invention is not limited to a bag, and a food package may be formed in a container form, for example. As shown in FIG. 7, in the food package 220 in the form of a container, the container body 2
The lid 220-2 for closing the open end of the heterogeneous printing unit 18
Formed from the food packaging film 10 of the present invention, and having any one of the edges, for example, the edge 220a
In addition, the heterogeneous printing section 18 is arranged with one end hung on the edge thereof, and the heat seal 22 on the edge side has predetermined extending portions 18a, 18b at the edge and a position opposed thereto. Each is applied within the width to be left (see FIG. 4A).

In the container-like food package 220, as in the case of the bag-type food package, rupture is obtained at the extension 18a of the heterogeneous printing unit due to expansion inside the package. Then, the base film 12 and the sealant film layer of the heterogeneous printing unit are formed by the escape of the vapor from the rupture hole 24.
Since the hollow deaeration path 26 can be appropriately formed under the separation between the fourteen pieces 14, the same effect as in the above-described bag form can be sufficiently ensured even in the food package 220 in this container form (FIG. 5
(See (A) and (B)).

The embodiments described above are intended to explain the present invention, and do not limit the present invention in any way, and all modifications and alterations within the technical scope of the present invention are also included in the present invention. It goes without saying that it is included in the invention.

[0045]

As described above, according to the food package for a microwave oven according to the present invention, since various preparatory operations are not required at the time of cooking, the operation at the time of cooking is complicated. It can be reliably prevented. And since the bonding strength itself by heat sealing is not reduced and it is not affected by the microwave output of the microwave oven, the sealing function of the food, that is, the deterioration of the hygiene protection function for the food is reliably prevented. In addition to this, the ability to cope with various conditions during heating and cooking can be reliably improved.

Further, since the food packaging film for a microwave oven according to the present invention, which constitutes the food packaging, is formed as a single resin-based laminated film, the food packaging is recycled after consumption of the food. Becomes possible. In other words, this recycling is expected to greatly contribute to measures against waste disposal problems centered on reduction of waste.

Further, in this food packaging film, it is sufficient that a heterogeneous printing portion made of a heterogeneous ink is partially provided in the printing layer on the inner surface of the base film, so that the manufacturing process becomes complicated and the structure becomes complicated. Is reliably prevented. Further, according to the heterogeneous printing portion using the heterogeneous ink, unlike the release agent, the adhesion of the relevant portion can be surely obtained, so that the appearance quality and the like due to unnecessary peeling can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line AA of FIG. 2, showing a food packaging film for a microwave oven according to the present invention.

FIG. 2 is a schematic perspective view of a food packaging film.

FIG. 3 shows an example of a food package compatible with a microwave oven.
It is a schematic perspective view of the bag body of a gas seal seal form.

4 is a cross-sectional view taken along line BB of FIG. 3, showing before and after expansion of the food package.

5 is a cross-sectional view taken along the line BB of FIG. 3 and the line CC of FIG. 3, showing the rupture of the sealant film layer.

FIG. 6 is a schematic perspective view of a three-side sealed pouch showing a modified example of a food package compatible with a microwave oven.

FIG. 7 is a schematic perspective view of a food package for a microwave oven, showing an example in a container form.

[Explanation of symbols]

 10 Microwave-compatible food packaging film 12 Base film 14 Sealant film layer 18 Heterogeneous printing unit 20,120,220 Microwave-compatible food packaging 22 Heat seal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AB01 BA12A BB14A BB25A CA17 CA24 EA06 EE02 FA01 FB13 FC01 GB07 GD07 4F100 AK01B AK01C AK07 AK41 AK48 BA03 BA04 BA07 BA10A BA10C BA32 EC03 EC032 GB17 HBL31H

Claims (2)

[Claims] 1. A sealant film layer made of the same type of synthetic resin material as the base film, which is laminated on the inner surface side of the base film on which the printing layer is provided, is mutually adhered to the base film under the fusion bonding. This is a single resin-based laminated film that is combined with a specific surface on the printing layer on the inner surface of the base film under the application of a heterogeneous ink containing a synthetic resin material of a different system from the resin system of the laminated film as one component. Partially forms a heterogeneous printing part of a shape, and this heterogeneous printing part is partly defined between the inner surface of the base film and the sealant film layer as a peelable weak adhesive area for food packaging for microwave ovens. the film. 2. A sealant film layer made of the same kind of synthetic resin material as that of the base film, which is laminated on the inner surface side of the base film on which the printing layer is provided, is mutually adhered to the base film under the fusion bonding. Using a food packaging film as a combined single resin-based laminated film,
A heat-sealing at a corresponding edge portion where the sealant film layer is arranged on the inner surface side and superimposed is a food packaging body of a corresponding form formed so as to be able to seal food, wherein the food packaging film is a laminated film The resin system is formed by partially having a heterogeneous printing portion of a specific planar shape formed by applying a heterogeneous ink having a synthetic resin material of a different system from the resin system as one component in a printing layer on the inner surface of the base film,
The heterogeneous printing part is partially defined between the inner surface of the base film of the food packaging film and the sealant film layer as a peelable weak adhesive area, and the heterogeneous printing part is formed at any one end. Place one end on the edge at the side, and heat seal the edge,
A food package for a microwave oven, which is provided within a width that leaves a predetermined extension portion at an edge and a position facing the edge, respectively.