JP2009255946A - Container and packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container controllable in shape change when heated in a microwave oven. <P>SOLUTION: A packaging bag 1 at least partly formed of a material deformable by a specified force is equipped with an elastic member 4. The elastic member has a first section attached in contact with a first site of the material and a second part attached in contact with a second site of the packaging bag 1 different from the first site. When the member 4 is heated, a tensile force of a specified force or higher is produced between the first part and the second part to deform the material into a specified shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a container and a packaging bag for cooking by heating in a microwave oven.

  Conventionally, so-called retort foods in which foods contained in packaging bags such as pouches are heated and sterilized in a retort kettle are widely distributed and used. Since the retort food is sealed by the packaging bag, if it is to be heated as it is in the microwave oven, the packaging bag may expand and burst due to water vapor generated from the food.

In order to solve this problem, there has been proposed a packaging bag in which the heat-resistant nonwoven fabric for escaping the above-mentioned water vapor is folded in two and attached to the inside of one side of the packaging bag (for example, patent document) 1). When heating retort food using this packaging bag in a microwave oven, cut off the end side where the non-woven fabric is attached, open the end on the non-woven fabric side, and then heat the food in the microwave oven together with the packaging bag To do.
Japanese Patent Laid-Open No. 8-80978

  In the packaging bag described in Patent Document 1, since steam is ejected from the opened end during heating, the end is preferably directed upward during heating. However, packaging bags filled with retort foods generally cannot be said to have good stability, causing unexpected deformation during heating, such that the end faces downward or the packaging bag itself falls over. May end up. This is a problem because it causes spillage of contents during heating.

  This invention is made | formed in view of the said situation, and it aims at providing the container and packaging bag which can control the shape change at the time of heating with a microwave oven.

  A first aspect of the present invention is a container formed of a material that is at least partially deformable with a predetermined force, wherein the first part is attached in contact with the first part of the material, and the second part is Attached in contact with a second part of the container different from the first part, and contracted by being heated to generate a tension greater than the predetermined force between the first part and the second part, It has a contraction member which transforms the material into a predetermined shape.

  When the container of the present invention is heated during cooking or the like, the contracting member contracts and tension is generated between the first part and the second part, and part of the material is deformed into a predetermined shape.

  A second aspect of the present invention is a packaging bag formed by integrally joining four end portions of a front member and a back member, and is attached to at least one of the front member and the back member and heated. And a contraction member that contracts to deform at least one of the front member and the rear member into a predetermined shape.

  When the packaging bag of the present invention is heated during cooking or the like, the contracting member contracts and at least one of the front member and the back member is deformed into a predetermined shape.

  The packaging bag according to the present invention further includes an opening in which an opening for diffusing water vapor generated inside is formed to the outside, and when the shrink member is heated and shrunk, the opening faces a predetermined direction. Thus, the shape of at least one of the front member and the rear member may be changed. In this case, it is possible to prevent the contents from spilling or the like by suitably controlling the direction of the opening during heating.

The back member may include a folded portion folded back in a bellows shape, and the contraction member may be attached to the front member so that at least a part thereof overlaps with the folded portion in a front view. In this case, the opening can be raised more satisfactorily.
The “front view” refers to a state in which the packaging bag is viewed such that the front member is the front.

  According to the container and the packaging bag of the present invention, it is possible to provide a container and a packaging bag capable of controlling the shape change when heated in a microwave oven.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a packaging bag 1 which is an embodiment of the container of the present invention. The packaging bag 1 is filled with food such as curry as will be described later. The packaging bag 1 includes a front member 2, a back member 3 joined to the front member 2, and a contracting member 4 attached to the front member 2.

As shown in FIG. 1, the front member 2 and the back member 3 are formed by integrally joining four end portions, and the first end portion 5 that is one of the four end portions is removed. Can be opened.
In the following description, expressions such as front and rear, left and right are unless otherwise specified, as shown in FIG. 1, with the front member 2 as the front, the first end 5 as the upper end, and the opposite side of the first end 5. The state with the second end 6 as the lower end is used as a reference.

The front member 2 is formed of a sheet-like flexible film (hereinafter referred to as “main body film”) having heat-fusibility.
The main body film is made of polyester (nylon) (Ny), polyethylene terephthalate (PET), or a laminate of these, and a base layer on which an inorganic compound such as aluminum oxide or silicon oxide is deposited. The adhesive layer is formed by laminating.

  2 is a cross-sectional view taken along line AA in FIG. The back member 3 is formed of a main body film similarly to the front member 2. The back member 3 is formed with two folded portions including a first folded portion (folded portion) 7 on the first end portion 5 side and a second folded portion 8 on the second end portion 6 side. The folded portions 7 and 8 are formed so as to be folded in a so-called bellows shape alternately once in the vertical direction so that the folding line is substantially parallel to the first end portion 5 and the second end portion 6, respectively. That is, the 1st folding | turning part 7 and the 2nd folding | turning part 8 are provided so that each folding line may become substantially parallel. The number of times of folding of the folding sections 7 and 8 may be set as appropriate.

  A first projecting portion 7A and a second projecting portion 8A are formed on the folded portions 7 and 8, respectively. And the bottom face part 9 used as the bottom face at the time of use of the packaging bag 1 mentioned later is formed between the 1st protrusion part 7A and the 2nd protrusion part 8A. In the present embodiment, the first projecting portion 7A faces the first end portion 5 side and the second projecting portion 8A faces the second end portion 6 side, but the direction of each projecting portion is not particularly limited. Absent.

  As shown in FIG. 1, a steam vent (opening) 10 for escaping water vapor generated inside the packaging bag 1 to the outside is provided at the center in the left-right direction of the first end 5. The steam vent 10 is formed by a seal having a substantially V-shaped easy peel property. The first end portion 5 excluding the portion where the vapor venting portion 10 is provided has the front member 2 and the rear member 3 heat-sealed. Instead, the entire first end portion 5 is easily peeled. You may join with the seal of.

  At the left and right end portions below the first end portion 5 of the packaging bag 1, notches 11 are provided as a trigger when the first end portion 5 is removed and opened. The notch 11 may be provided only at one of the left and right ends. A slit may be provided instead of the notch 11.

  The contraction member 4 is a sheet-like member and has a property that at least one dimension in the width direction and the longitudinal direction contracts by heating. As the shrink member 4, a shrink film formed of various resins can be suitably employed. As the shrink film, either a uniaxially stretched film or a biaxially stretched film can be adopted, but the uniaxially stretched film is preferable because it can easily control the shape change of the packaging bag 1 described later.

  Moreover, since the shrinkage | contraction member 4 produces | generates large tension | tensile_strength at the time of shrinkage | contraction, so that the shrinkage | contraction rate at the time of heating (the reduction | decrease rate of the length in the predetermined direction when it shrink | contracts) is high, for example, a shrink film etc. with a shrinkage | contraction rate of 40% or more . However, since the tension also changes depending on the area of the contraction member 4, the tension of the contraction member 4 depends on the shape change of the packaging bag 1 desired to be defined by the contraction member 4, the rigidity of the front member 2 on the side to be bonded, and the like. The shrinkage rate and area may be set as appropriate. Furthermore, it is preferable that the shrinkage start temperature of the shrinkable member 4 is set to 60 ° C. or higher so that the shrinkable member 4 does not start shrinking at a stage before use of the packaging bag 1 such as a distribution stage.

  As shown in FIG. 1, the contracting member 4 is attached by attaching the entire lower surface facing the front member 2 to the approximate center in the left-right direction of the outer surface of the front member 2 with an adhesive or the like. As shown in FIG. 2, the lower end 4 </ b> A of the contracting member 4 is located closer to the second end portion 6 than the folding line 7 </ b> B serving as the base of the first projecting portion 7 </ b> A of the first folded portion 7, and contracted in front view. At least a part of the member 4 is attached so as to overlap the first folded portion 7.

  As the adhesive for fixing the shrink member 4, various pressure-sensitive adhesives and the like can be used. However, the adhesive may be peeled off due to the tension generated when the shrink member 4 is heated and shrunk, or the bonding position may be shifted. It is necessary to have an adhesive strength that does not. Moreover, the thing whose adhesive strength does not fall by heating is more preferable.

The manufacturing procedure of the packaging bag 1 configured as described above will be described.
First, the back member 3 and the front member 2 on which the folded portions 7 and 8 are formed are opposed to each other, and the four end portions excluding the second end portion 6 are joined together by heat fusion. At this time, the vapor venting part 10 is formed in a part of the first end part 5.

Next, the food A is filled inside using the second end 6 which is not joined as a filling port. After filling, the second end 6 is sealed by heat fusion or the like. After the retort sterilization of the food A, the packaging bag 1 is completed when the shrinkable member 4 is attached to the front member 2 as shown in FIG.
At this time, when a uniaxially stretched film is used as the contracting member 4, the lower end 4 </ b> A and the upper end 4 </ b> B are selected and attached so that the contracting direction is substantially parallel to the vertical direction of the packaging bag 1.

  Next, the operation when using the packaging bag 1 will be described. First, the user sets the packaging bag 1 in the microwave oven with the back member 3 facing down. Then, the food A enters the first folded portion 7 and the second folded portion 8, and the folded portions 7, 8 extend so as to rise in a substantially vertical direction with respect to the front member 2 as shown in FIG. 4. .

  Subsequently, when the packaging bag 1 is heated by the microwave oven, the food A is cooked. At this time, as shown in FIG. 4, a steaming space S in which high-temperature steam generated by heating stays is formed inside the packaging bag 1. At the same time, the easy-peeling steam vent 10 is peeled off by the filled steam, and a steam vent 12 is formed in the first end 5 so that excess steam is discharged outside the packaging bag 1. In this way, the packaging bag 1 is prevented from being ruptured due to the water vapor filling while maintaining the steaming space S.

  In parallel with this movement, the contraction member 4 contracts by heating. As shown in FIG. 4, the contracting member 4 bonded to the front member 2 contracts as indicated by an arrow, thereby generating a tension that bends the front member 2. At this time, since the packaging bag 1 is filled with the food A, the relatively lightweight first end 5 side rises upward as indicated by an arrow. In this way, the shape change of the packaging bag 1 due to heating in the microwave oven is suitably controlled by the shrinkable member 4, so that the food A can be prevented from being spilled or spilled.

  After cooking is completed, the user tears the notch 11 to open the entire first end 5 and puts the food A on the container.

Here, the packaging bag 1 of this embodiment is further demonstrated using an Example.
(Example)
As the main body film for forming the front member 2 and the back member 3, a laminated film of PET, Ny, unstretched polypropylene (CPP) is used. A pouch container having a direction (horizontal) of 150 mm and a vertical direction (vertical) of 200 mm was produced. Before joining the second end 6, the interior was filled with 200 ml of water.

  As the shrinkable member 4, a film (trade name LX-61S, manufactured by Mitsubishi Plastics, Inc.) made of PET having a width of 50 mm, a length of 60 mm, and a thickness of 50 micrometers (μm) was prepared. This film is a uniaxial shrink film having a shrinkage rate of 72% under conditions of 80 ° C. hot water for 10 seconds. A pressure-sensitive adhesive made of an acrylic ester copolymer is applied to the entire back surface of the shrinkable member 4, and a region including the lower end 4 </ b> A is superimposed on the first folded portion 7 in the front view at the center in the left-right direction of the front member 2. The shrinkable member 4 was attached to the front member 2 to form a packaging bag 1A.

  The finished packaging bag 1A is left at room temperature for 2 days and then heated using a 700 watt microwave oven (Sharp Co., Ltd., trade name RE-T13). The contraction member 4 started to contract. As the contracting member 4 contracts, the first end 5 is lifted upward.

  About 3 minutes after the start of heating, the packaging bag 1 started to expand due to the generated water vapor. However, since the first end 5 was already lifted, the expansion continued without causing overturning or abnormal deformation. Thereafter, the steam release part 10 was peeled off due to the increase in the internal pressure of the packaging bag 1A to form a steam release hole 12, and a part of the water vapor inside was released to avoid rupture.

  When the above heating test was performed 20 times, no spillage or splash of water due to overturning or abnormal deformation was observed. Moreover, neither the burning member nor the scorch was recognized in the shrinkable member 4 and the adhesive after heating for 10 minutes in the microwave and after heating for 20 minutes. Moreover, the shift | offset | difference of the adhesion position of the contraction member 4 was not recognized.

  As described above, according to the packaging bag 1 of the present embodiment, the contracting member 4 contracts with cooking, and the first end 5 in which the steam vent hole 12 is formed by the tension generated by the contracting member 4. Since the shape change is controlled so that the steam vent hole 12 is raised upward, the steam vent hole 12 is prevented from becoming an unexpected shape such as facing downward, and spillage or splashing of the filled food A is suitably performed. Can be prevented. Therefore, the packaging bag which can be heated safely with a microwave oven can be comprised.

  Moreover, when the 1st folding | turning part 7 and the 2nd folding | turning part 8 bent by the bellows form expand | deploy, the internal volume of the packaging bag 1 increases and the steaming space S is ensured. Therefore, uniform heating is performed inside the packaging bag 1, and cooking can be performed satisfactorily.

  In addition, since the front member 2 is formed of a single sheet-like main body film, the number of parts is small, and the packaging bag can be configured with a simple structure at a low cost.

  Although one embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. is there.

  For example, in the above-described embodiment, the example in which the first folded portion 7 and the second folded portion 8 are provided substantially in parallel has been described. However, the present invention is not limited to this, and the folding lines intersect each other. If not, it may be in any positional relationship. Moreover, each folding | returning part 7 and 8 does not need to be parallel to the 1st end part 5 or the 2nd end part 6, for example, may be provided so as to be orthogonal to the 1st end part 5 or the 2nd end part 6. . Further, although the volume increasing action is slightly reduced, only one folded portion may be provided.

  Moreover, in the above-mentioned embodiment, although the vapor venting part 10 opened automatically at the time of a heating and the vapor | steam escaped to the exterior of a packaging bag was demonstrated, this invention is not limited to this, In microwave oven Before being heated, an opening for venting may be formed by the user. As the opening formed in the opening, various known structures such as a simple opening from which a part of the end is removed and a non-woven fabric or the like attached may be adopted. Various known structures may be employed for the structure that seals the opening until use.

In the above-described embodiment, the example in which the entire surface of the contracting member 4 that faces the front member 2 is bonded to the front member 2 is described. Instead, as in the modification shown in FIG. Alternatively, a contracting member 20 in which a plurality of bonding portions 21 are provided substantially in parallel and the bonding portions 21 and the non-bonding portions 22 are alternately arranged may be used. In this way, the contracting member 20 is more reliably bonded to the front member 2, and the non-bonding portion 22 contracts as shown by the arrow to generate tension, thereby obtaining the same effect as the contracting member 4. Can do. In this case, when the contraction member 4 is formed of a uniaxially stretched film, it is preferable to set the direction of the contraction member so that the contraction direction is substantially orthogonal to the longitudinal direction of the bonding portion 32 and the non-bonding portion 33.
Further, if a large-size sheet material in which the adhesive portions 32 and the non-adhesive portions 33 are alternately provided is used, there are less restrictions on positioning and the like when cutting out the shrinkable member from the sheet material, and a structure suitable for mass production. It becomes.

  In addition, the shrink member may be bonded to the front member using a heat seal in addition to the above-described adhesive, or may be performed using another member such as a tape. Further, only the regions of a certain length from the upper and lower ends of the contracting member may be bonded to the front member, or only the peripheral portions of the four sides may be bonded. Further, an adhesive may be applied and bonded to various shapes such as a dot shape, a grid shape, and a staggered shape.

  Further, the shape of the contracting member 4 is not limited to a quadrangle as in the above-described embodiment. For example, the four corners may be formed in an R shape, or other various shapes such as a drum shape, a barrel shape, and an oval shape. Further, it may be formed in a frame shape or a U-shape with the center portion cut off.

In the above-described embodiment, the example in which the contracting member 4 is attached in the vicinity of the first end portion 5 where the steam vent hole 12 is formed during heating has been described, but the present invention is not limited to this, Various attachment methods are possible depending on the shape of the packaging bag that is sometimes desired to be controlled.
For example, by bonding one end of the contracting member 4 to each projecting portion 7A, 8A of each folded-back portion 7, 8, the other end is bonded to a desired position of the back member 3, so that the contracting member is heated. The shape change may be controlled so as to increase the stability of the packaging bag 1 by moving the projecting portions 7A and 8A by 4 in an arbitrary direction.

Furthermore, the attachment target of the contraction member is not limited to the packaging bag 1 described above. For example, as shown in FIG. 6, in a standing pouch (container) 25 formed by folding a film-like bottom member 26 between a front member 2 and a rear member 3, the front member 2 and The shrink member 4 may be attached to the end of the bottom member 23 joined to the back member 3.
In this case, during heating, the contraction member 4 contracts as indicated by an arrow in FIG. 7, so that the end portions of the front member 2 and the back member 3 to which the bottom member 26 is joined are joined to the bottom member 26 by the contraction member 4. The deformation is controlled so as to widen. As a result, the stability of the standing pouch 25 during heating can be satisfactorily maintained.

  In addition, in the above-mentioned embodiment, the example of the packaging bag formed from the main body film formed including the resin has been described. However, the container of the present invention is not limited to this, and various types such as paper and polystyrene foam. A container formed of a material can be employed. Further, even if the main body portion of the container is formed of a plastic having a thickness that cannot be controlled by the tension generated by the contraction member, for example, a plastic having a thickness of a predetermined value or more, a part of the lid portion, for example, If the shrink member is made of a material that can be deformed by the tension generated during shrinkage, attach at least a part of the shrink member to the part and fix the other part of the shrink member to a different part of the container. It is possible to control the part to be deformed into a desired shape.

  Moreover, although the above-mentioned embodiment demonstrated the example of the retort sterilized food, the application object of this invention is not limited to this, If a user heats after distribution | circulation, frozen food, chilled distribution food Alternatively, it can be applied to containers and packaging bags for various foods such as foods distributed at room temperature.

It is a perspective view which shows the packaging bag of one Embodiment of this invention. It is sectional drawing in the AA of FIG. It is sectional drawing which shows the manufacturing procedure of the packaging bag. It is a figure which shows the shape at the time of the heating of the packaging bag. It is an enlarged view which shows the contraction member in the modification of this invention. It is a figure which shows a part of standing pouch which is a modification of this invention. It is a figure which shows a part of the standing pouch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Front member 3 Back member 4, 20 Shrink member 4A Lower end (one edge part)
5 1st edge part 6 2nd edge part 7 1st folding | turning part (folding part)
10 Vapor vent (opening)
12 Vapor vent (opening)
25 Standing pouch (container)

Claims (4)

A container at least partially formed of a material that can be deformed with a predetermined force,
The first part is attached in contact with the first part of the material, the second part is attached in contact with a second part of the container different from the first part, and the first part shrinks by being heated. A container comprising: a contraction member that generates a tension equal to or greater than the predetermined force between the first portion and the second portion to deform the material into a predetermined shape. A packaging bag formed by integrally joining the four ends of the front member and the back member,
A packaging bag comprising: a shrinkable member attached to at least one of the front member and the back member, and shrinking when heated to deform at least one of the front member and the back member into a predetermined shape. . Further comprising an opening in which an opening for releasing water vapor generated inside to the outside is formed;
The packaging bag according to claim 2, wherein when the contraction member is heated and contracts, the shape of at least one of the front member and the back member is changed so that the opening portion faces a predetermined direction. . The back member has a folded portion folded back in a bellows shape,
The packaging bag according to claim 3, wherein the contraction member is attached to the front member so that at least a part thereof overlaps with the folded portion in a front view.

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