JP6475613B2 - Resin packaging bag for microwave oven, heating method thereof, filling method for resin packaging bag for microwave oven, and package - Google Patents

Description

  The present invention relates to a packaging bag for packaging food and the like.

In addition to conventional cooking utensils such as pans and frying pans, microwave ovens are becoming widely established in the home as cooking utensils as well as heating utensils.
For this reason, with the spread of heat sterilization and freezing technology, it is widely used to cook cooked or semi-cooked retort foods, frozen foods, chilled foods with a microwave oven, etc., and eat them as they are. (See Patent Document 1).

  In recent years, the number of households with two or fewer households has been increasing, and the need for food for one or two persons is increasing. In particular, the number of elderly people is increasing and the retirement of baby boomers is progressing, and the number of households preparing meals in the family is increasing. At convenience stores, reflecting the changes in social conditions, we have been rapidly expanding the lineup of items such as chilled side dishes for individual consumption, especially in bagging. In addition to these chilled side dishes, the assortment of frozen foods topped with grilled dumplings and sauces such as pasta and then subjected to freezing treatment is also increasing. In either case, the food is cooked at the store or in the home with microwave heating.

By the way, in general, retort food and frozen food are premised on long-term storage, and are not intended to be cooked and sold within a short time.
The following three types of methods are adopted for the distribution form of these commercially available water-containing processed foods in stores.
(1) Distribution at normal temperature (distribution and sale at normal temperature after aseptic filling or retort sterilization)
(2) Distribution in refrigerated state (distribution and sale at 3-10 ° C after aseptic filling or heat sterilization)
(3) Distribution in the frozen state (distributed and sold in the frozen state after freezing)
In any of the distribution forms (1) to (3), food is packaged in a bag, a plastic container, a can or the like. In particular, the packaged foods as in the above (1) and (2) are usually heat sterilized after vacuum packaging and delivered and displayed at normal temperature or in a chilled state in order to extend the shelf life.
Aseptic filling packages that fill and seal liquids that have been sterilized in large quantities with a plate-type sterilizer in advance, such as beverages, in sterile environments are circulated at room temperature, but contain hydrated solids. Food is difficult to process in this manner.

  Prepared foods, fish meat, and processed meat products are generally sealed in bags and plastic containers and killed by retort sterilization, or sterilized by heat, and heat-sterilized to keep the bacteria in the food below a certain number. In order to suppress the growth of the food, it is stored at low temperatures and distributed for sale, or frozen immediately after cooking and distributed in a frozen state.

  When performing retort sterilization or heat sterilization treatment, if there is a head space (void) in the bag or container, the sterilization time will be greatly extended due to the heat insulation effect of the air, and the food texture (feeling of crunch, texture, throat, etc.) Alters the taste, color, and aroma. Further, when heat sterilization is performed with steam or hot water under normal pressure, the bag or container is ruptured by the thermal expansion of air.

  Frozen pasta or the like contained in a container sealed with a fitting lid is not completely sealed and is not suitable for long-term frozen storage. As a result of freezing, frozen foods increase the surface area of the food, so that the oxidation of oil easily proceeds with oxygen in the container despite the low temperature environment. In order to enclose the oxygen scavenger and maintain a nitrogen atmosphere, the flange portion of the container body must be hermetically sealed with a laminated film lid to completely shut off the outside air.

In order to ripen the pasta in a container or the like in a microwave oven, it is necessary to peel off a part of the lid film in advance and escape the steam generated during heating. Increasing the internal pressure during microwave heating is necessary to maintain the atmospheric temperature in the container at around 100 ° C., and is particularly desirable for shortening the thawing cooking time of frozen foods.
However, the head space originally exists and the heating effect is restricted. In addition, if a part of the lid film is peeled off in advance, the inside of the container cannot be maintained at a normal pressure or higher, so that the cooking time naturally increases.

Further, when a packaging container having a head space in which a molding container and a lid material are combined is used as the packaging material, the outer shape of the molding container is destroyed during vacuum packaging.
Furthermore, when using a packaging container, it is necessary to adjust and control the pressure in the retort device as the temperature of the food in the container rises and falls in order to suppress deformation of the container during retort sterilization. In addition, the above-described heat insulation effect of the air is also adversely affected.

As mentioned above, a packaging container is not suitable when sterilizing after vacuum packaging.
For this reason, packaging bags containing heat-resistant plastic films are basically used as packaging materials, and prepared dishes, fish and processed meat products are packed in packaging bags and vacuum sealed to completely eliminate the internal air. Thus, retort sterilization treatment, steam, and hot water sterilization treatment are usually performed.
In general, in the case of packaged food using a packaging bag, a purchaser performs once the food is transferred from the bag to a container and heated for microwave cooking.

By the way, since the bag expands with steam generated during heating, a part of the bag is opened before heating the microwave oven, or cooking is performed while letting the steam escape from the exhaust port provided in the bag as a function corresponding to the microwave oven. It is normal to finish.
However, to take it out of the microwave oven, you have to be careful about burns. To eat it as it is, it must be transferred to another container, and it is difficult to use it even if you take it home.
It is troublesome to transfer food to a container, and it is necessary to clean the container after use, and there is a problem that the amount of garbage increases when the container is disposable.

JP 2008-290738 A

  The present invention provides a new resin packaging bag that can be sterilized by heating after vacuum packaging, can be cooked as it is without transferring the contents to a container, and the packaging material itself can be used as a container. With the goal.

In the packaging bag used by sealing the peripheral portion, the present inventors made one side of the packaging bag a resin sheet, and the other side a resin film, so that the content containing moisture was added to this. Housed and microwave heated with a microwave oven with the resin sheet side as the bottom, the internal volume of the packaging bag increases due to the heat and pressure of water vapor generated from the contents, and the resin film expands accordingly. Then, the peripheral edge of the resin sheet was pulled up, the resin sheet was deformed into a vessel shape, and the present invention was completed by finding that the deformed state was maintained even after the heating was completed.
The present invention for solving the above-described problems is as described below.

(1) The front side consists of a single resin film,
The back side consists of a single resin sheet,
A packaging bag used by sealing the resin film and the resin sheet with each other at the entire periphery,
Both the resin film and the resin sheet do not have a bent part parallel to the length direction of the edge at the side edge part thereof,
The resin sheet has a larger thickness than the resin film and is made of a plastically deformable material that is deformed when stress is applied when heated, and that maintains the deformed state after heating. And
When the packaging body formed by sealing the content containing moisture between the resin film and the resin sheet is heated in a microwave oven with the resin sheet on the back side as the bottom surface,
Due to the heat of water vapor generated from the contents and the increase in the internal volume of the packaging bag due to the increase in the internal pressure of the packaging body, the stress that the peripheral edge of the resin film pulls the peripheral edge of the resin sheet upward acts and, wherein the back side of the resin sheet is deformed to so that such a concave shape, after completion of heating and microwaves for resin packaging bag, characterized in that it has the concave shape in order to maintain all or part.
(2) The resin packaging bag for microwave ovens according to (1), wherein the resin sheet is a resin laminated sheet having a resin film adhered to the back side surface thereof.
(3) The front side consists of two resin films,
The back side consists of a single resin sheet,
Resin film of the resin sheet side of said two plastic films are adhered to the front surface of the resin sheet
It is a packaging bag used by sealing the two resin films with each other at the peripheral edges,
Neither of the two resin films and the resin sheet has a bent part parallel to the length direction of the edge at the side end part thereof,
The resin sheet has a larger thickness than the resin film and is made of a plastically deformable material that is deformed when stress is applied when heated, and that maintains the deformed state after heating. And
The resin film and the resin sheet were heated in a microwave oven with a package formed by sealing the contents containing moisture between the two resin films, with the resin sheet on the back side as the bottom surface. When the peripheral edge of the resin film pulls the peripheral edge of the resin sheet upward due to the heat of water vapor generated from the contents and the increase in the internal volume of the packaging bag due to the increase in the internal pressure of the package There acts, the back side of the resin sheet becomes concave shape, after completion of heating and microwaves for resin packaging bag, characterized in that it has the concave shape in order to maintain all or part.
(4) Resin in which the resin sheet and the resin film on the resin sheet side are bonded by an adhesive layer , the adhesive layer is weakly adhesive, and contains contents by heating with a microwave oven The resin-made packaging bag for microwave ovens according to (3), wherein the film-made film and the resin-made sheet are separable.
(5) A packaging bag used by sealing the peripheral edge,
Superimposing a resin film on the front side and a resin film on the back side on both sides of the resin sheet,
One resin film is back-sealed and sealed to form the front-side resin film and the back-side resin film,
The resin sheet has a larger thickness than the resin film and is made of a plastically deformable material that is deformed when stress is applied when heated, and that maintains the deformed state after heating. And
The resin film and the resin sheet are formed by sealing a package containing moisture contained between the front resin film and the resin sheet with the back resin film as a bottom surface. When heated in a range, the peripheral edge of the resin film moves up the peripheral edge of the resin sheet due to the heat of water vapor generated from the contents and the increase in the internal volume of the packaging bag due to the increase in the internal pressure of the packaging body. tensile increased stress acts on, the resin sheet becomes concave shape, after completion of heating and microwaves for resin packaging bag, characterized in that it has the concave shape in order to maintain all or part.
( 6 ) The resin packaging bag for microwave ovens according to any one of (1) to ( 5 ), wherein the resin sheet is cut.
( 7 ) The resin-made packaging bag for microwave ovens according to any one of (1) to ( 5 ), wherein a shallow concave portion is formed in the vicinity of the center of the resin-made sheet in advance.
( 8 ) The resin for microwave ovens according to any one of (1) to ( 5 ), wherein a plurality of annular recesses and annular projections are alternately formed concentrically in advance on the resin sheet. Made of packaging bag.
( 9 ) The resin-made film for microwave oven according to any one of (1) to ( 8 ), wherein means for automatically opening a vapor hole during microwave heating is provided on the resin film surface. Packaging bag.
( 10 ) A part of the seal part between the resin film and the resin sheet is a weak seal, and the weak seal part is peeled off during heating in the microwave and is opened as a vapor hole (1) Or the resin-made packaging bags for microwave ovens as described in (2) .
( 11 ) A microwave oven such that the whole or a part of the peripheral portion of the resin packaging bag for microwave oven is sandwiched by a frame so that the flange portion of the resin sheet becomes substantially horizontal during heat plastic deformation in the microwave oven. The microwave heating method of a resin packaging bag for a microwave oven according to any one of (1) to ( 10 ), wherein the heating is performed.
( 12 ) The whole or a part of the peripheral part of the microwave resin packaging bag is sandwiched between the back side of the microwave resin packaging bag by a frame having a wall surface that controls plastic deformation during microwave heating. The microwave heating method for a resin packaging bag for microwave ovens according to any one of (1) to ( 10 ), wherein the microwave oven heating is performed.
( 13 ) After filling the water-containing contents into the resin packaging bag from the opening of the microwave packaging resin packaging bag according to any one of (1) to ( 10 ), the opening A bag-feeding automatic filling method characterized in that a plastic packaging bag is sealed by sealing the part.
(14) over the resin sheet by a sheet of plastic film and tubular, and back lined seal both ends of the resin film, a packaging bag used to seal the peripheral portion, and the packaging After filling the water-containing contents from the opening of the microwaveable resin packaging bag according to ( 5 ), which is end-sealed on one side of the bag, the opening is sealed to make the resin packaging A bag supply type automatic filling method characterized by sealing the bag.
( 15 ) A method for filling a resin packaging bag for a microwave oven according to any one of (1) to (4) with a water-containing content, on the inner surface of the resin sheet or packaging bag. A resin sheet to which a resin film is bonded is unwound from a roll, and after the contents containing moisture are placed on the resin sheet or the resin film bonded to the resin sheet, the resin sheet is unwound from the roll. The resin film thus obtained is overlapped so as to cover the contents, and the side surface portion is sealed, and then the end seal is applied to the two opening portions and sealed packaging is performed, and then the individual pieces are separated by a cutter. A roll-feeding automatic filling method characterized.
( 16 ) A package comprising a resin packaging bag for a microwave oven according to any one of (1) to ( 10 ) filled with a water-containing content and sealed.

  The packaging bag of the present invention is advantageous in that the contents can be cooked by heating with a microwave oven, and the resin sheet can be transformed into a bowl and used as tableware.

It is a figure which shows the state before the heating of the package body which filled and sealed the contents in the packaging bag of the 1st Embodiment of this invention. It is a figure which shows the state which heated the package shown in FIG. 1 with the microwave oven, and changed the resin-made sheet | seat into the concave shape. It is a figure which shows the state before the heating of the package body which filled the content in the packaging bag of the 2nd Embodiment of this invention, and was sealed. It is a figure which shows the state which heated the package shown in FIG. 3 with the microwave oven, and changed the resin-made sheet | seat into the concave shape. It is a figure which shows the state before the heating of the package body which filled and sealed the content in the packaging bag of the 3rd Embodiment of this invention. It is a figure which shows the state which isolate | separated the resin-made sheet | seat and the resin-made film, after heating the package body shown in FIG. 5 with a microwave oven, changing a resin-made sheet into a concave shape. It is a figure which shows the state before the heating of the package body which filled and sealed the content in the packaging bag of the 4th Embodiment of this invention. It is a figure which shows the state which heated the package shown in FIG. 7 with the microwave oven, and changed the resin-made sheet | seat into the concave shape. It is a figure which shows the structure of the resin-made sheet | seat of the packaging bag of the 5th Embodiment of this invention. It is a figure which shows an example of the frame body which pinches | interposes the peripheral part of a packaging bag used in the 7th Embodiment of this invention. It is a figure which shows an example of the frame body which pinches | interposes the peripheral part of a packaging bag used in the 8th Embodiment of this invention. It is a figure which shows the other example of the frame which pinches | interposes the peripheral part of a packaging bag used in the 7th Embodiment of this invention. It is a figure which shows the automatic filling apparatus for manufacturing the packaging bag of 1st, 1, 2, 3, 6 embodiment of this invention. It is a figure which shows the cross section of a-a ', b-b', and c-c 'shown by FIG. It is a figure which shows an example of the notch | incision provided in the resin-made sheets.

The packaging bag of the present invention has a thin resin sheet on the bottom side of the bag that is deformed into a concave shape by the heat and pressure of steam generated during microwave heating and functions as a simple container, saving resources, being inexpensive and highly convenient as a disposable container It can contribute to society as a technology.
Further, the present invention is an epoch-making invention that can be applied to any distribution form of distribution at normal temperature, distribution in a refrigerated state, and distribution in a frozen state.

Embodiments of the packaging bag of the present invention will be described below.
Hereinafter, the resin-made packaging bag for microwave oven of the present invention is also simply referred to as “packaging bag”.
(First embodiment)
This embodiment is shown in FIGS.
The packaging bag of the present embodiment is a packaging bag that is used by sealing the periphery, and the front side of the packaging bag is made of one resin film, and the back side is made of one resin sheet. When the resin film and the resin sheet are heated in a microwave oven with the back side of the resin sheet on the back side, the package formed by sealing the content containing moisture between the resin film and the resin sheet The resin sheet on the back side is deformed by the heat and pressure of water vapor generated from the contents, and is made of a material that retains all or part of the recessed shape even after heating.

  The resin sheet may be a resin laminated sheet having a resin film adhered to at least the back side surface. As will be described later, the resin sheet may be provided with cuts to facilitate deformation. When the resin sheet is made of a barrier resin and the barrier property is maintained as a whole packaging bag, the cut may damage the resin sheet and hinder the barrier property. By having the barrier resin film adhered to the back side of the resin sheet, the barrier property of the packaging bag can be more reliably maintained.

FIG. 1 shows an example of the packaging bag of this embodiment.
FIG. 1 (A) is a view showing a package in a state where the packaging bag of the present embodiment is filled with the contents and sealed, and FIG. 1 (B) is a cross-sectional view taken along the line aa ′ of FIG. 1 (A). FIG. 1C is an enlarged view of a cross section of the side seal portion 11 of FIG.

  As shown in FIGS. 1B and 1C, the package shown in FIG. 1A is formed by stacking a resin film 2 on a resin sheet 1 and side seal portions 11 and 12 and end seal portions 13 ( The bottom seal is formed to form a three-sided seal bag, and after filling the content 10 containing moisture from the opening, an end seal (top seal) portion 14 is formed in the opening. .

Moreover, after the packaging body shown in FIG. 1 (A) places the contents 10 containing moisture on the resin sheet 1 and forms the side seal portions 11 and 12 by superposing the resin film 2 thereon. The end seal portions 13 and 14 can also be obtained by vacuum sealing.
As shown in FIG. 1C, a resin film base 21 has a heat-welded layer 22 made of heat-welded resin on one surface for sealing.

When the package shown in FIG. 1 is placed in a microwave oven, water vapor is generated from the water-containing contents 10 to increase the internal pressure of the package, and the internal volume of the packaging bag is increased as shown in FIG. As the internal volume increases, the peripheral edge of the resin film 2 pulls the peripheral edge of the resin sheet 1 upward, and the resin sheet 1 is plastically deformed into a concave shape to form a vessel. When the heating by the microwave oven is finished, the resin sheet 1 of the package is held in a concave shape (container shape) because the plastic deformation conditions of the temperature and pressure of the heating steam are not satisfied.

FIG. 2 is a view showing a state in which the package shown in FIG. 1 is heated in a microwave oven and the resin sheet is deformed into a concave shape.
Thereafter, by removing all or part of the resin film, the concave resin sheet can be used as it is.

As a material for the resin sheet 1, a material that can be plastically deformed by applying stress during heating can be used, and a preferable material is a polypropylene sheet containing a filler. In this case, it is sufficient that the thickness of the resin sheet is about 200 to 300 μm.
The resin sheet 2 used in the present invention includes a resin foam sheet.
On the other hand, the material for the resin film is preferably a heat-resistant film that does not thermally shrink even when heated in a microwave oven, and examples thereof include a polyethylene terephthalate film. In addition, a heat-welded resin layer is provided on the heat-welded surface of the resin film to give heat-weldability to the resin film. As this heat-welded resin, LLDPE (Linear Low Density Polyethylene) is used. And CPP (Cast Polypropylene).

(Second Embodiment)
This embodiment is shown in FIGS. FIG. 3 shows an example of a package in which the packaging bag of this embodiment is filled with contents.
The packaging bag of the present embodiment is a packaging bag that is used with its peripheral edge sealed, and the front side of the packaging bag is composed of two resin films 2 and 3 as shown in FIG. It consists of a single resin sheet 1. Of the two resin films, the inner resin film 3 is bonded to the resin sheet 1, and the resin films 2, 3 and the resin sheet 1 are between the two resin films. When the package containing the water-containing contents is sealed and heated in a microwave oven with the back side resin sheet 1 as the bottom surface, the back side is deformed by the heat and pressure of water vapor generated from the contents. The resin sheet 1 has a concave shape, and is made of a material that maintains all or part of the concave shape even after the heating is completed.

FIG. 3 (A) is a view showing the package in a state where the packaging bag of the present embodiment is filled with the contents and sealed, and FIG. 3 (B) is a cross-sectional view taken along the line bb ′ of FIG. 3 (A). FIG. 3C is an enlarged view of a cross section of the side seal portion 11 of FIG.
The package shown in FIG. 3A includes a resin film 2, a resin film 3, and a resin sheet 1. For example, the resin film 2 and the resin film 3 form a three-side sealed bag. Then, the resin film 3 and the resin sheet 1 are bonded, and after filling the content 10 containing moisture from the opening, an end seal portion 14 is formed in the opening.
As shown in FIG. 3C, the bases 21 and 31 of the resin film have heat-welded layers 22 and 32 made of heat-welded resin on one surface for sealing.

In the case of this embodiment, the surface of the resin sheet 1 and the surface of the resin film 3 on which the heat welding layer is not formed are overlapped. When a filler-filled polypropylene sheet is used as the resin sheet 1 and a polyethylene terephthalate film is used as the resin film 3, the two are not bonded by heat sealing, so the resin sheet 1 and the resin film 3 are not bonded. It is necessary to provide an adhesive layer.
FIG. 4 is a view showing a state where the package shown in FIG. 3 is heated in a microwave oven and the resin sheet 1 is deformed into a concave shape.

(Third embodiment)
This embodiment is shown in FIGS. FIG. 5 shows an example of a package in which the packaging bag of this embodiment is filled with contents.
This embodiment is an application of the second embodiment.
In the present embodiment, the adhesive layer between the resin sheet 1 and the resin film 3 in the second embodiment is weakly adhesive. By doing in this way, after the heating by a microwave oven is complete | finished, the resin-made sheets 1 and the resin-made films 2 and 3 which accommodated the contents 10 can be isolate | separated. And the content 10 accommodated in the resin films 2 and 3 can be taken out and transferred to the container of the resin sheet 1 for eating.
Since the packaging bag of the present embodiment has a shape in which the contents are accommodated in the resin films 2 and 3 as in the packaging bag of the second embodiment, even if there is a pinhole in the resin sheet 1 The sealed state of the packaging bag can be maintained.

FIG. 5 (A) is a view showing the package in a state where the packaging bag of the present embodiment is filled with the contents and sealed, and FIG. 5 (B) is a sectional view taken along the line cc ′ of FIG. 5 (A). FIG. 5C is an enlarged view of a cross section of the side seal portion 11 of FIG.
The package shown in FIG. 5 (A) includes a resin film 2, a resin film 3, and a resin sheet 1. In this package, for example, a resin film 2 and a resin film 3 form a three-sided sealing bag, the resin film 3 and the resin sheet 1 are bonded, and then the contents containing moisture from the opening. After filling 10, the end seal portion 14 is formed in the opening.
As shown in FIG. 5C, one surface of the base 21 and 31 of the resin film has heat-welded layers 22 and 32 made of heat-welded resin for heat sealing.
The adhesive layer between the resin sheet 1 and the resin film 3 is weakly adhesive, and is separated at the adhesive portion S between the resin sheet 1 and the resin film 3 during heating by heating with a microwave oven. The resin sheet 1 and the resin film 3 can be separated by applying a force with a finger after the heating is completed.
FIG. 6 is a view showing a state where the package shown in FIG. 5 is heated in a microwave oven and the resin sheet 1 is deformed into a concave shape.

(Fourth embodiment)
This embodiment is shown in FIGS.
The packaging bag of the present embodiment is a packaging bag used by sealing the peripheral edge, and the front side and the back side of the packaging bag are each made of the resin film 2, and the front side resin film 2 and the back side resin film 2 Thus, the resin sheet 1 is covered. The resin-made film 2 and the resin-made sheet 1 are made of a package formed by sealing a content 10 containing moisture between the front-side resin-made film 2 and the resin-made sheet 1, and the back-side resin-made film. When heated in a microwave oven with 2 as the bottom, the resin sheet 1 on the back side is deformed by the heat and pressure of water vapor generated from the contents 10 and becomes a concave shape. It is made of a material that maintains the part.
In this embodiment, the resin sheet 1 may be sandwiched between two resin films 2 and sealed in three directions, or one resin film 2 is formed into a tube shape and resin is contained therein. The sheet 1 may be disposed and the resin film 2 may be back-sealed and sealed at both ends.

FIG. 7 shows an example of the packaging bag of this embodiment.
FIG. 7 (A) is a view showing the package in a state where the packaging bag of this embodiment is filled with the contents and sealed, and FIG. 7 (B) is a sectional view taken along the line dd ′ of FIG. 7 (A). FIG. 7C is an enlarged view of a cross section of the side seal portion 11 of FIG.
In the package shown in FIG. 7A, the resin sheet 1 is covered with a single resin film 2, and both ends of the resin film 2 are back-sealed to form a back-sealed seal portion 15. Yes. Moreover, the resin film 2 and the resin sheet 1 on the front side are sealed at the peripheral edge.
The packaging bag of this embodiment has the advantage that the manufacturing of the packaging bag is simple.
FIG. 8 is a view showing a state where the package shown in FIG. 7 is heated in a microwave oven and the resin sheet 1 is deformed into a concave shape.

(Fifth embodiment)
This embodiment is shown in FIG.
The packaging bag of the present embodiment is obtained by forming a plurality of annular convex portions 33 and annular concave portions 34 alternately in a concentric manner in advance on the resin sheet 1.
Various shapes such as a rectangular shape, a circular shape, and an oval shape can be selected as the annular shape.
What has shown in FIG. 9 has a rectangular annular convex part and a recessed part.
FIG. 9A is a view of the packaging bag as seen from the resin sheet 1 side. FIG. 9B is a cross-sectional view taken along line XX in FIG. As shown in FIG. 9B, the resin sheet 1 has a cross-sectionally bent shape.

In the packaging bag of the present invention in which the resin sheet on the back side is deformed and formed into a concave shape by heating in a microwave oven, the substantially flat resin sheet that is formed when pressing the predetermined concave shape after molding is concentric. A plurality of annular protrusions and annular recesses are alternately formed.
This concentric uneven shape is formed in advance on a resin sheet by sheet molding using a mold, and a packaging bag formed by sealing peripheral edges of resin films on the front side is the packaging bag of this embodiment.
When a packaging body formed by sealing the contents containing moisture in the packaging bag is heated in a microwave oven with the resin sheet 1 on the back side as a bottom surface, the resin sheet is generated by the heat and pressure of water vapor generated from the contents. 1 is softened, and the annular convex portion 33 and the annular concave portion 34 formed as an extension allowance due to the increase in internal pressure are elongated to form the shape of the container.
According to this embodiment, compared with the case where the flat resin sheet 1 is used on the bottom side of the packaging bag, it is possible to form the concave container shape by microwave heating closer to the planned shape.

  In FIG. 9, the example which does not provide the concentric annular convex part 33 and the annular recessed part 34 in the peripheral part of the resin-made sheets 1 was shown. However, the area | region which forms the cyclic | annular convex part 33 and the cyclic | annular recessed part 34 in the resin-made sheets 1 can be set suitably. The annular convex portion 33 and the annular concave portion 34 may be provided on the entire surface of the resin sheet 1.

(Sixth embodiment)
In the above description, a case where a three-side seal bag is prepared in advance as a packaging bag and filled with contents is described as an example.
However, as shown in FIG. 13, the resin sheet 1 to which the long resin sheet 1 or the resin film is bonded and the long resin film 2 are respectively fed out from the raw roll, and the resin sheet 1 and The contents 10 are arranged between the resin film 2, and then the four sides are sealed for each unit region where the contents 10 are arranged, and then individually separated by the cutter 36 to form individual packaging bags. May be. In such a case, a packaging bag is formed as well as a packaging bag. Such an embodiment is also included in the embodiment of the packaging bag of the present invention.
Usually, the term packaging bag refers to one having an opening before filling the contents. However, when a packaging bag is formed while the packaging bag is formed by the method as described above, there is no form of a packaging bag having an opening. However, the package obtained by the above method is in a state in which the contents are filled and sealed in the packaging bag, and is not a package obtained by filling and sealing the contents in the packaging bag having an opening. There is no difference.
Therefore, in the present invention, the packaging material portion in the case where the packaging bag is formed as well as the packaging bag as described above is also referred to as “packaging bag”.
This embodiment is applicable to the packaging bags of the first, second and third embodiments.
Further, after the resin sheet is unwound from the raw fabric, the annular protrusion 33 and the annular recess 34 as shown in the fifth embodiment are formed on the resin sheet, and the resin sheet is sent to the contents filling step. Good.
As described above, if the raw material feeding, filling of contents, and separation into pieces are performed in one facility, there is no need to stock packaging bags, so that the effect of space saving is great.

(Other embodiments of the packaging bag)
Other embodiments relating to the packaging bag include the following.
(1) A cut may be made in the resin sheet. Due to the incision, the resin sheet can be easily deformed. Of course, this notch needs to be formed so as to maintain a sealed state.
As the incision, for example, the shape of the incision 39 as shown in FIG. 15 is conceivable so that the resin sheet can be deformed according to the amount and shape of the contents.

(2) The resin sheet may be basically planar, but not necessarily planar.
For example, the recess may be formed shallowly in advance by a method such as applying heat to a resin sheet and embossing.
By doing in this way, the resin sheet can be easily deformed into a concave shape during heating in the microwave oven. Forming deep recesses is not preferable because the packaging bag is bulky and the distribution cost is high, and because the head space is large, the packaging bag is deformed during vacuum sealing.

(3) The resin film may be wrinkled like a gusset. Since the inner volume of the bag can be increased when the amount of the contents is increased by applying the bag, it is not necessary to change the type of the resin bag even if the type and amount of the contents are changed.

(4) A vapor hole is automatically opened in a part of the resin film during microwave heating.
Depending on the heating time and wattage of the microwave oven, the packaging bag may burst during heating. In preparation for such a case, a means for automatically opening a vapor hole in a part of the resin film during microwave heating may be provided on the surface of the resin film. As a configuration for this purpose, for example, a configuration described in Japanese Patent No. 4817583 can be cited.

(5) In the packaging bag in which the resin film is sealed at the periphery of the resin sheet, a weak seal portion is provided in a part of the seal portion. Thereby, since the said weak seal part peels and opens as a vapor hole during microwave oven heating, even if it heats too much, a package does not burst.

Next, an embodiment of the microwave heating method for a packaging bag of the present invention will be described.
(Seventh embodiment)
This embodiment will be described with reference to FIG.
FIG. 10 (A) is a view showing a frame 40 used when heating the package filled with the contents in the packaging bag of the present invention, and FIGS. 10 (B) to 10 (D) show the frame. The state when the packaging body was heated in a microwave oven with the peripheral edge of the packaging bag being sandwiched is shown over time.
First, a frame body 40 in which two frame members 41 and 42 as shown in FIG. Next, as shown in FIG. 10B, the flange portion (peripheral portion) 46 of the packaging bag is sandwiched between the frame members 41 and 42, and the fixing members 44 and 45 are used so that the flange portion 46 does not come off the frame body 40. Fix it.
When the packaging body is heated in the microwave oven in this state, as shown in FIG. 10C, the packaging bag expands and the resin sheet is plastically deformed into a container shape. Next, when the microwave heating is finished, as shown in FIG. 10D, the resin sheet keeps the shape of the vessel.
By using the frame body 40 in this manner, the flange portion 46 of the resin sheet is constrained so as to maintain a flat state by the frame body, so that the flange portion does not wave and becomes an excellent aesthetic device.

(Eighth embodiment)
The present embodiment will be described with reference to FIG.
FIG. 11 (A) is a figure which shows the frame 50 which has a wall surface used when heating the package which filled the content in the packaging bag of this invention, FIG.11 (B)-FIG.11 (D) is this The state when the packaging body is heated in a microwave oven with the peripheral edge of the packaging bag sandwiched between the frame body is shown with time.
First, a frame 50 in which a frame member 51 having a wall surface as shown in FIG. 11A and a frame member 52 are connected by a hinge 53 is prepared. Next, as shown in FIG. 11 (B), the flange part (peripheral part) 46 of the packaging bag is sandwiched between the frame members 51 and 52, and fixed with the fixing members 54 and 55 so that the flange part 46 does not come off the frame body. To do.
When the packaging body is heated in the microwave oven in this state, as shown in FIG. 11C, the packaging bag expands and the resin sheet is plastically deformed into a container shape. Next, when the microwave heating is finished, as shown in FIG. 11D, the resin sheet keeps the shape of the vessel.
Further, the wall surface 51 does not need to be entirely made of a wall material, and a gap 56 may be provided on the wall surface as shown in FIG.
By using the frame 50 in this way, the plastic deformation of the resin sheet portion forming the vessel can be controlled, and the resin sheet is in a state of being molded in a microwave oven. A resin sheet can be formed into a vessel having an intended shape, and has a more aesthetic appearance.

Embodiments of the method for filling a packaging bag of the present invention will be described below.
(Ninth embodiment)
In the case where the packaging bag of the embodiment is a resin packaging bag formed by sealing the periphery of three sides, the content containing moisture from the unsealed opening of the packaging bag sent to the automatic filling device Then, automatic filling is performed by sealing the opening with a seal (bag feeding type automatic filling method).

(Tenth embodiment)
When the packaging bag is the resin packaging bag of the fourth embodiment, the resin sheet is covered with a tube-shaped resin film, and the resin film is back-sealed and sealed on one side of the packaging bag. After the end seal is applied and the content containing moisture is filled from the opening, automatic filling is performed by sealing the opening with a seal (bag feeding type automatic filling method).

(Eleventh embodiment)
When the packaging bag is the resin packaging bag of the first embodiment, the resin sheet is unwound from the roll, and after the content containing moisture is placed on the resin sheet, it is unwound from the roll. The resin film is layered so as to cover the contents, the side surfaces are sealed, and then the two openings are end-sealed and sealed and sealed, and then automatically separated by a cutter. Filling is performed (roll supply type automatic filling method).

FIG. 13 is a view for explaining the roll supply type automatic filling method of the present embodiment.
The resin sheet 1 fed out from the raw roll is conveyed toward the vacuum sealing device 35.
On the resin sheet 1, a content containing moisture is placed in the middle of conveyance. FIG. 14A is a cross-sectional view taken along the line aa ′ in FIG.
Next, the resin film 2 fed out from the raw roll is overlaid on the content 10 containing moisture. FIG. 14B is a cross-sectional view taken along the line bb ′ in FIG.
The resin sheet 1 on which the resin film 2 is stacked and the content 10 containing moisture enter the vacuum seal device, and are vacuum degassed and sealed in the vacuum seal device to form a package. FIG. 14C is a cross-sectional view taken along the line cc ′ in FIG. As shown in FIG. 14C, the resin sheet 1, the resin film 2, and the content 10 containing moisture are in close contact with each other.
Subsequently, the continuous body of vacuum-sealed packaging bags is cut one by one by a cutter 36 to form a packaging body 37.
In FIG. 13, the shaded portion around the package 37 indicates a seal portion 38.

(Twelfth embodiment)
The present invention includes, as an embodiment, a package body in which the contents containing water are contained and sealed in the resin packaging bag for microwave ovens of each of the above-described embodiments.

The present invention will be described based on examples. Note that it is easy for a person skilled in the art to make other embodiments by appropriately changing / modifying the examples of the present invention described below, and these changes / modifications are included in the present invention. The description is an example of a preferred embodiment of the invention and is not intended to limit the invention.
In the following description, PET represents polyethylene terephthalate, LLDPE represents linear low density polyethylene, and PP represents polypropylene.
Moreover, the resin film and the resin sheet used in the examples were as follows.
(Resin film)
PET (12 μm thick): Toray Industries, Inc. P60
LLDPE (50 μm thickness): Futamura Chemical Co., Ltd. XHT
(Resin sheet)
PP sheet (250 μm thick) with filler (talc, calcium carbonate)

[Example 1]
(Test conditions)
The packaging bag shown in FIG. 1 was produced as follows.
Sample (packaging bag) size: 128mm x 175mm
Resin film: PET (12 μm thick) / LLDPE (50 μm thick)
Resin sheet: PP sheet with filler (250 μm thick)
Bag form: A resin film was directly sealed on the periphery of the resin sheet.
Contents: Paper soaked with 10 cc of water Microwave heating setting: 500 W · 1 minute Number of samples: 5 (test results)
As a result of microwave heating, the height from the bottom surface of the resin sheet to the seal portion was 31.75 mm as an average value of four sides.

[Example 2]
(Test conditions)
The packaging bag shown in FIG. 3 was produced as follows.
Sample (packaging bag) size: 128mm x 175mm
Resin film: PET (12 μm thick) / LLDPE (50 μm thick)
Resin sheet: PP sheet with filler (250 μm thick)
Bag form: A three-sided bag made of a resin film was directly bonded to a resin sheet.
Contents: Paper soaked with 10 cc of water Microwave heating setting: 500 W · 1 minute Number of samples: 5 (test results)
As a result of heating in the microwave, the height from the bottom surface of the resin sheet to the seal portion was 29.25 mm as an average value of four sides.

[Example 3]
(Test conditions)
The packaging bag shown in FIG. 5 was produced as follows.
Sample (packaging bag) size: 128mm x 175mm
Resin film: PET (12 μm thick) / LLDPE (50 μm thick)
Resin sheet: PP sheet with filler (250 μm thick)
Bag form: A three-sided bag made of a resin film was weakly bonded to a resin sheet with an arbitrary width on only four sides.
Contents: Paper soaked with 10 cc of water Microwave heating setting: 500 W · 1 minute Number of samples: 5 (test results)
As a result of microwave heating, the height from the bottom surface of the resin sheet to the seal portion was 29.75 mm as an average value of four sides.
Further, the resin sheet and the resin film could be easily separated after heating in the microwave.

[Example 4]
(Test conditions)
The packaging bag shown in FIG. 7 was produced as follows.
Sample (packaging bag) size: 128mm x 175mm
Resin film: PET (12 μm thick) / LLDPE (50 μm thick)
Resin sheet: PP sheet with filler (250 μm thick)
Bag form: The upper 4 sides of the resin sheet were sealed with an arbitrary width in a palm bag made of a resin film.
Contents: Paper soaked with 10 cc of water Microwave heating setting: 500 W · 1 minute Number of samples: 5 (test results)
As a result of microwave heating, the height from the bottom surface of the resin sheet to the seal portion was 27.75 mm as an average value of four sides.

[Example 5]
(Test conditions)
A packaging bag was produced in the same manner as in Example 4 except that the resin sheet shown in FIG. 9 was used as the resin sheet in Example 4.
Sample (packaging bag) size: 128mm x 175mm
Resin film: PET (12 μm thick) / LLDPE (50 μm thick)
Resin sheet: PP sheet with filler (200 μm thick)
Annular convex part: 3 pieces (H = 3mm, L = 4mm)
Bag form: The upper 4 sides of the resin sheet were sealed with an arbitrary width in a palm bag made of a resin film.
Contents: Paper containing 10 cc of water Microwave heating setting: 500 W · 1 minute Sample number: 5

(Test results)
About Examples 1-4, as a result of microwave oven heating, the height from the bottom face of a resin-made sheet to a seal part was 27.75 mm by the average value of 4 sides.
About Example 5, as a result of carrying out microwave oven heating, the height from the bottom face of a resin-made sheet | seat to a seal | sticker part was 42.50 mm by the average value of 4 sides.

  The heated resin sheets obtained in the above examples all have a bowl shape with a height of about 30 mm, and have a depth sufficient for use as tableware.

The effects of the packaging bag of the present invention are listed as follows.
(1) The packaging bag of the present invention can be cooked by heating with a microwave oven, and the resin sheet can be transformed into a bowl shape and used as tableware.
(2) In the case of a packaging container using a tray, if there is a head space, the tray will be deformed when heat sterilized after vacuum packaging, and thus the packaging bag of the present invention is not suitable for this packaging / sterilization method. Vacuum sterilization packaging is possible.
(3) In the case of a packaging container, there is a problem that the space efficiency (material inventory space efficiency, transportation efficiency, display efficiency) is poor at the food packaging site and in the distribution process because the head space is bulky, but the packaging bag of the present invention Space efficiency is good because it is not bulky like a packaging container at the food packaging site and distribution process.
(4) Since the resin sheet used in the invention can be thinner than the resin sheet for packaging containers, the amount of resin material used can be reduced, and there is an advantage that it is environmentally friendly.
(5) Since the packaging bag of the present invention is basically a flat shape and the face surface is a resin film, it has a higher degree of freedom in design than a tray + lid packaging container and has excellent eye catching properties. Yes.

DESCRIPTION OF SYMBOLS 1 Resin sheet 2 Resin film 3 Resin film 10 Water-containing content 11, 12 Side seal part 13, 14 End seal part 15 Back sticking seal part 21 Resin film base material 22 Heat welding layer 31 Resin film Base material 32 Heat welding layer 33 Convex part 34 Concave part 35 Vacuum seal device 36 Cutter 37 Packaging body 38 Sealing part 39 Notch 40 Frame body 41, 42 Frame member 43 Hinge 44, 45 Fixing member 46 Flange part 50 Frame body 51, 52 Frame Member 53 Hinge 54, 55 Fixing member 56 Gap S Bonding part

Claims (16)

The front side consists of a single resin film,
The back side consists of a single resin sheet,
A packaging bag used by sealing the resin film and the resin sheet with each other at the entire periphery,
Both the resin film and the resin sheet do not have a bent part parallel to the length direction of the edge at the side edge part thereof,
The resin sheet has a larger thickness than the resin film and is made of a plastically deformable material that is deformed when stress is applied when heated, and that maintains the deformed state after heating. And
When the packaging body formed by sealing the content containing moisture between the resin film and the resin sheet is heated in a microwave oven with the resin sheet on the back side as the bottom surface,
Due to the heat of water vapor generated from the contents and the increase in the internal volume of the packaging bag due to the increase in the internal pressure of the packaging body, the stress that the peripheral edge of the resin film pulls the peripheral edge of the resin sheet upward acts and, wherein the back side of the resin sheet is deformed to so that such a concave shape, after completion of heating and microwaves for resin packaging bag, characterized in that it has the concave shape in order to maintain all or part.   The resin-made packaging bag for a microwave oven according to claim 1, wherein the resin-made sheet is a resin-made laminated sheet having a resin film adhered to the back side surface thereof. The front side consists of two resin films,
The back side consists of a single resin sheet,
Resin film of the resin sheet side of said two plastic films are adhered to the front surface of the resin sheet
It is a packaging bag used by sealing the two resin films with each other at the peripheral edges,
Neither of the two resin films and the resin sheet has a bent part parallel to the length direction of the edge at the side end part thereof,
The resin sheet has a larger thickness than the resin film and is made of a plastically deformable material that is deformed when stress is applied when heated, and that maintains the deformed state after heating. And
The resin film and the resin sheet were heated in a microwave oven with a package formed by sealing the contents containing moisture between the two resin films, with the resin sheet on the back side as the bottom surface. When the peripheral edge of the resin film pulls the peripheral edge of the resin sheet upward due to the heat of water vapor generated from the contents and the increase in the internal volume of the packaging bag due to the increase in the internal pressure of the package There acts, the back side of the resin sheet becomes concave shape, after completion of heating and microwaves for resin packaging bag, characterized in that it has the concave shape in order to maintain all or part. The resin sheet and the resin film on the resin sheet side are adhered by an adhesive layer , the adhesive layer is weakly adhesive, and a resin film containing contents by heating with a microwave oven; The resin packaging bag for a microwave oven according to claim 3, wherein the resin sheet can be separated. A packaging bag used by sealing the peripheral edge,
Superimposing a resin film on the front side and a resin film on the back side on both sides of the resin sheet,
One resin film is back-sealed and sealed to form the front-side resin film and the back-side resin film,
The resin sheet has a larger thickness than the resin film and is made of a plastically deformable material that is deformed when stress is applied when heated, and that maintains the deformed state after heating. And
The resin film and the resin sheet are formed by sealing a package containing moisture contained between the front resin film and the resin sheet with the back resin film as a bottom surface. When heated in a range, the peripheral edge of the resin film moves up the peripheral edge of the resin sheet due to the heat of water vapor generated from the contents and the increase in the internal volume of the packaging bag due to the increase in the internal pressure of the packaging body. tensile increased stress acts on, the resin sheet becomes concave shape, after completion of heating and microwaves for resin packaging bag, characterized in that it has the concave shape in order to maintain all or part. The resin packaging bag for microwave oven according to any one of claims 1 to 5 , wherein the resin sheet is cut. The resin packaging bag for microwave oven according to any one of claims 1 to 5, wherein a shallow recess is formed in the vicinity of the center of the resin sheet. The resin-made packaging bag for a microwave oven according to any one of claims 1 to 5 , wherein a plurality of annular concave portions and annular convex portions are alternately and concentrically formed in advance on the resin sheet. The resin packaging bag for microwave oven according to any one of claims 1 to 8 , wherein means for automatically opening a vapor hole during heating of the microwave oven is provided on the resin film surface. Some of the sealed portion of the resin film and the resin sheet is weak seal, part of the weak seal is separated in the microwave oven heating to claim 1 or 2, characterized in that the opening as a vapor hole The resin-made packaging bag for microwave ovens of description. The whole or a part of the peripheral edge of the resin packaging bag for microwave oven is sandwiched by a frame, and the microwave heating is performed so that the flange portion of the resin sheet is substantially horizontal when heating plastic deformation in the microwave oven. The microwave oven heating method of the resin-made packaging bags for microwave ovens in any one of Claims 1-10 characterized by these. Microwave oven heating is performed by sandwiching the whole or a part of the peripheral portion of the resin packaging bag for microwave ovens with a frame having a wall for controlling plastic deformation during heating of the microwave oven on the back side of the resin packaging bag for microwave ovens. The microwave heating method of the resin-made packaging bags for microwave ovens in any one of Claims 1-10 characterized by the above-mentioned. The three-side-sealed resin packaging bag for microwave oven according to any one of claims 1 to 10 , after filling the resin packaging bag with water-containing contents from the opening, sealing the opening A bag-feeding automatic filling method characterized by sealing a resin packaging bag. A packaging bag which is used by covering a resin sheet with a single resin film in a tube shape, sealing both ends of the resin film back and sealing the peripheral edge, and one of the packaging bags 6. After filling the moisture-containing contents from the opening of the microwave plastic packaging bag according to claim 5 , the opening is sealed and the resin packaging bag is sealed A bag-feeding automatic filling method characterized by: A method for filling a resin packaging bag for a microwave oven according to any one of claims 1 to 4 with a water-containing content, wherein the resin film adheres to the inner surface of the resin sheet or packaging bag. The resin sheet fed out from the roll after the resin sheet fed out from the roll is placed on the resin sheet or the resin film bonded to the resin sheet. The roll supply is characterized in that the side parts are sealed so as to cover the contents, and then the end seals are applied to the two openings and sealed and packaged, and then separated one by one by a cutter. Automatic filling method. The package body by which the resin-containing packaging bag for microwave ovens in any one of Claims 1-10 is filled with the content containing a water | moisture content, and is sealed.

Images