JP2023008158A - package - Google Patents

Abstract

To propose a package that allows for re-sealing after unsealing and pressure cooking in heating with an electronic oven and moreover is not to pose a danger of burst or explosion.SOLUTION: A package 1 includes a container body 2 having an opening 3 sealed by a lid material 4. The lid material has a second opening 6 formed by an U-shaped cutout 5, in which the second opening in its entirety is sealed by an adhesive sheet 7. By removing the adhesive sheet from a bottom direction of an U-shape of the U-shaped cutout, the second opening can be opened. At a side end of the adhesive sheet, a cutout 9 having a length longer than 10 mm and penetrating through an entire thickness of the adhesive sheet is provided cooperatively with a side end of the second opening. The cutout is positioned 3 mm or more inner than the side end of the adhesive sheet and within 7 mm. When the adhesive sheet is once removed and re-sealed, adhesion strength is 2 N/15 mm or smaller.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a package mainly containing foodstuffs, and more particularly to a package that can be resealed after being opened and heated in a microwave oven as it is.

Containers using plastic materials are widely used as containers for storing foods. In particular, containers for storing frozen foods are more convenient if they can be taken out of the freezer and thawed and heated in a microwave oven. At this time, if it is a normal container, there is a risk that the container may burst or explode due to steam generated by heating.

In order to prevent such a danger, the frozen food storage container described in Patent Document 1 is a container in which a vapor release opening automatically opens as the food is heated. The container for storing frozen food described in Patent Document 1 has a label attached to an opening for venting steam, which has a large thermal contraction rate when heated. Explosion and rupture can be prevented because the steam vent is open.

On the other hand, with the diversification of microwave cooking in recent years, for example, cooking methods such as opening a container once, adding ingredients and seasoning liquid, etc., and then heating and cooking in a microwave oven. As a result, a method called pressurized cooking that obtains a high cooking effect has been attracting attention. The frozen food storage container described in Patent Document 1 could not meet such demands.

JP-A-10-278975

The problem to be solved by the present invention is to propose a package that can be resealed after being opened, can be pressure-cooked when heated in a microwave oven, and does not cause the risk of rupture or explosion. is.

As a means for solving the above problems, the invention according to claim 1 is a package body in which the opening of the container body is sealed with a lid material, the lid material being formed by a U-shaped cut. It has a second opening, the entire second opening is sealed with an adhesive sheet, and the second opening can be opened by peeling the adhesive sheet from the U-shaped notch toward the bottom of the U-shaped cut. A cut extending through the entire thickness of the adhesive sheet having a length of more than 10 mm is provided between the side end of the adhesive sheet and the side end of the second opening, and the cut extends through the entire thickness of the adhesive sheet. The position is 3 mm or more and within 7 mm from the side edge of the adhesive sheet, and the adhesive strength when the adhesive sheet is peeled off and resealed is 2 N/15 mm or less. be.

Since the package according to the present invention has a second opening covered with an adhesive sheet, it is possible to reseal it and cook it in a microwave oven after opening it once and adding ingredients etc. There is, and the risk of rupture or explosion can be avoided by the action of the notches provided in the cover material and the adhesive sheet.

Further, the invention according to claim 2 is a package in which the opening of the container body is sealed with a lid material, the lid material having a second opening formed by a U-shaped cut, The entire two openings are sealed with an adhesive sheet, and the second opening can be opened by peeling the adhesive sheet from the U-shaped notch toward the bottom of the U-shaped cut. , between the side edge of the second opening and the side edge of the adhesive sheet, a notch having a length longer than 10 mm and penetrating the lid material is provided, and the position of the notch is the position of the adhesive sheet. The package is characterized by being 3 mm or more and 7 mm or less inside from the side edge, and having an adhesive strength of 2 N/15 mm or less when the adhesive sheet is once peeled off and resealed.

Further, the invention according to claim 3 is the package according to claim 1 or 2, wherein the lid member and the adhesive sheet contain a gas barrier layer that does not contain a metal foil or a metal deposition layer.

Further, the invention according to claim 4 is characterized in that the adhesive sheet has a grip part for peeling from the bottom of the U-shaped cut in the direction of the U-shaped cut. It is a package according to the item.

Since the package according to the present invention has a second opening covered with an adhesive sheet, it is possible to reseal it and heat and cook it in a microwave oven after it is opened and ingredients are added. be. In addition, due to the action of the notches in the lid material and adhesive sheet, even if the package is heated in the resealed state, the generated steam is released from the notches, reducing the risk of the package rupturing or exploding. can be avoided.

By setting the adhesive strength of the adhesive sheet after resealing to 2 N/15 mm or less, steam release performance is ensured, and pressure cooking can be realized by adjusting the position of the cut.

FIG. 1 is a schematic plan view showing a first embodiment of the package according to the present invention. 2 is a schematic side view of the package shown in FIG. 1. FIG. FIG. 3 is an explanatory side view showing a state in which the package shown in FIGS. 1 and 2 is opened. FIG. 4 is a schematic plan view of the cover member of the package shown in FIGS. 1 and 2. FIG. 5 is a schematic plan view of the adhesive sheet of the package shown in FIGS. 1 and 2. FIG. FIG. 6 is a schematic plan view showing a second embodiment of the package according to the present invention. 7 is a schematic side view of the package shown in FIG. 6. FIG. FIG. 8 is an explanatory side view showing a state in which the package shown in FIGS. 6 and 7 is opened. FIG. 9 is a schematic plan view of the lid member of the package shown in FIGS. 10 is a schematic plan view of the adhesive sheet of the package shown in FIGS. 6 and 7. FIG. FIG. 11 is an explanatory diagram showing a state in which water vapor blows out when the package shown in FIG. 1 is heated in a microwave oven. FIG. 12 is an explanatory view showing a state in which water vapor blows out when the package shown in FIG. 6 is heated in a microwave oven. FIG. 13 is an explanatory diagram showing the length and position of cuts. FIG. 14 is a cross-sectional explanatory view showing an example of the layer structure of the lid material of the package according to the present invention.

A package according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic plan view showing a first embodiment of a package 1 according to the present invention. 2 is a schematic side view of the package shown in FIG. 1. FIG. FIG. 3 is an explanatory side view showing a state in which the package shown in FIGS. 1 and 2 is opened. FIG. 4 is a schematic plan view of the lid member 4 of the package shown in FIGS. FIG. 5 is a schematic plan view of the adhesive sheet 7 of the package shown in FIGS.

A first embodiment of the package 1 according to the present invention is a package in which the opening 3 of the container body 2 is sealed with a lid member 4. The lid member 4 is formed by a U-shaped notch 5. A second opening 6 is provided, and the entire second opening is sealed with an adhesive sheet 7. By peeling off the adhesive sheet 7 from the U-shaped notch toward the bottom of the U-shaped cut, the second opening 6 is opened. It is possible to open, and the side edge of the adhesive sheet 7 is provided with a cut 9 having a length longer than 10 mm and penetrating the entire thickness of the adhesive sheet between the side edge of the second opening 6 The position of the cut 9 is 3 mm or more and within 7 mm from the side edge of the adhesive sheet 7, and the adhesive strength when the adhesive sheet 7 is once peeled off and resealed is 2 N/15 mm or less. A packaging body characterized by:

A package 1 according to the present invention is provided with a second opening 6 formed by a U-shaped notch 5 in a lid member 4 that seals an opening 3 of a container body 2, and this second opening 6 is provided with an adhesive sheet. Since the structure is sealed at 7 , the second opening 6 can be opened by peeling the adhesive sheet 7 from the U-shaped notch 5 toward the bottom of the U-shape. Since the adhesive sheet 7 can be resealed even if it is once opened, for example, after the package 1 is opened and ingredients, seasoning liquid, etc. are introduced from the second opening 6, it is resealed, It can be cooked in a microwave oven.

FIG. 3 is an explanatory side view showing a state in which the package shown in FIGS. 1 and 2 is opened. It shows a state in which the second opening 6 is opened by peeling the adhesive sheet 7 from the direction of the bottom of the U-shaped notch.

In the package 1 according to the present invention, since the cut 9 is provided in the adhesive sheet 7, when the package after resealing is heated in a microwave oven, the generated water vapor escapes from the cut 9, so that the package The body cannot explode or explode.

FIG. 11 is an explanatory view showing a state in which steam S jets out when the package 1 shown in FIG. 1 is heated in a microwave oven. When the package 1 is heated, the moisture inside evaporates to generate steam. The entire container is deformed by the steam pressure and bulges outward. The adhesive sheet 7 is left behind because the adhesive layer softens and slips, and as a result, the U-shaped cut 5 formed in the lid member 4 crosses the cut 9 formed in the adhesive sheet 7. - 特許庁Since the water vapor S jets out from here, it is possible to prevent the container from bursting or exploding.

At this time, if the adhesive strength of the adhesive sheet 7 is too strong, it becomes difficult for water vapor to escape.

FIG. 5 is a schematic plan view of the adhesive sheet 7 of the package 1 shown in FIGS. In this example, a grip portion 8 is provided as a handhold for peeling off the adhesive sheet 7, and a notch 9 is provided at the side end portion. The cut 9 is a cut that penetrates the entire thickness of the adhesive sheet 7, has a length longer than 10 mm, and is positioned at least 3 mm inside the side edge of the adhesive sheet 7 and within 7 mm. has been experimentally clarified.

The grip portion of the adhesive sheet 7 can be realized by not providing an adhesive layer only on this portion, or by providing a coating layer that inhibits adhesion on the adhesive.

A second embodiment of the package 1 according to the present invention is a package in which the opening 3 of the container body 2 is sealed with a lid member 4, the lid member 4 being formed by a U-shaped notch 5. The entire second opening is sealed with an adhesive sheet 7, and the second opening is opened by peeling the adhesive sheet 7 from the U-shaped bottom of the U-shaped cut. It is possible to open the portion 6, and the lid member 4 has a cut extending through the lid member with a length longer than 10 mm between the side edge of the second opening 6 and the side edge of the adhesive sheet 7. 9 is provided, and the position of the cut 9 is 3 mm or more inside and 7 mm or less from the side edge of the adhesive sheet, and the adhesive strength when the adhesive sheet 7 is once peeled and resealed is 2 N / 15 mm. A package characterized by the following.

FIG. 6 is a schematic plan view showing the package 1 according to this embodiment. 7 is a schematic side view of the package shown in FIG. 6. FIG. FIG. 8 is an explanatory side view showing a state in which the package 1 shown in FIGS. 6 and 7 is opened. FIG. 9 is a schematic plan view of the lid member 4 of the package shown in FIGS. FIG. 10 is a schematic plan view of the adhesive sheet 7 of the package shown in FIGS.

In the first embodiment described first, the adhesive sheet 7 was provided with the cut 9, but in this embodiment, the adhesive sheet 7 is not provided with the cut as shown in FIG. As shown, the lid member 4 is provided with a notch 9 .

In this case, the length of the cut 9 needs to be longer than 10 mm, and the position needs to be 3 mm or more inside the side edge of the adhesive sheet 7 and within 7 mm. is clear as a result of

Further, the adhesive strength of the adhesive sheet 7 must be 2 N/15 mm or less when the adhesive sheet 7 is peeled off and resealed.

FIG. 12 is an explanatory view showing a state in which steam S blows out when the package 1 shown in FIG. 6 is heated in a microwave oven. When the package 1 is heated, the moisture inside evaporates to generate steam. The entire container is deformed by the steam pressure and bulges outward. Since the adhesive layer softens and slips, the adhesive sheet 7 is left behind, and as a result, the cut 9 formed in the lid member 4 is removed from the adhesive sheet 7 and exposed. Since the water vapor S jets out from here, it is possible to prevent the container from bursting or exploding.

FIG. 13 is an explanatory diagram showing the length L and position of the notch 9. As shown in FIG. The position can be defined by the distance d from the side edge of the adhesive sheet 7 . It has been found that the length of the incision 9 must be greater than 10 mm both in the first and in the second embodiment.

As for the position of the cut 9, in the first embodiment, if d is too short, that is, too close to the side edge of the adhesive sheet 7, the water vapor will not be able to escape, and will not escape through the original cut and will be ejected from the sealing portion. become. Conversely, if d is too long, water vapor may escape too easily, resulting in insufficient pressure cooking. On the other hand, in the second embodiment, if d is too short, i.e., if the notch 9 provided in the lid member 4 is too close to the side edge of the adhesive sheet 7, steam will escape too easily, resulting in insufficient pressure cooking. There is fear. On the other hand, if d is too long, the water vapor will be difficult to escape, and will not escape from the original cut and will be ejected from the seal portion.

Materials used for the package according to the present invention are described below. Although there are no particular restrictions on the container body 2, it is desirable to use a material with high heat resistance when heating with a microwave oven is assumed. Specific examples include polypropylene resin, polyethylene terephthalate resin, and polyamide resin. The molding method is also not particularly limited, and molding methods such as vacuum molding, vacuum pressure molding, and injection molding can be used.

The lid member 4 is similarly required to have a certain degree of heat resistance. When long-term storage stability of contents is required, it is desirable to include a gas barrier layer that suppresses the permeation of water vapor and oxygen. FIG. 14 is a cross-sectional explanatory view showing an example of the layer structure of the lid member 4 of the package according to the present invention. In this example, in addition to the base material layer 10 and the sealant layer 12, a gas barrier layer 11 is inserted. Since the cover material 4 used in the package according to the present invention is assumed to be heated by a microwave oven, it is necessary to use a gas barrier layer 11 that does not contain a metal foil or a metal deposition layer.

Examples of such gas barrier layers include gas barrier films such as polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol copolymer film, gas barrier nylon film, gas barrier polyethylene terephthalate (PET) film, and PET film. Inorganic oxide deposition films in which inorganic oxides such as aluminum oxide and silicon oxide are deposited, polyvinylidene chloride coatings, coatings containing water-soluble resins and inorganic layered compounds, metal alkoxides or their hydrolysates, and isocyanate compounds. Examples include a gas barrier coating layer such as a resin layer made of a reacted film.
The packaging body according to the present invention will be described more specifically based on examples and comparative examples below.

<Example 1>
A polypropylene resin container having a shape as shown in FIGS. 1 and 2 was used as the container body. The long side is 250 mm, the short side is 110 mm, and the height is 30 mm. The width of the flange portion is 10 mm.
As a cover material, a laminated film of a gas barrier film (GL-PET manufactured by Toppan Printing Co., Ltd., thickness 12 μm) deposited with an inorganic oxide and a non-stretched polypropylene resin film (CPP) 30 μm thick was used.
As the adhesive sheet, a laminated film of a vinylidene chloride-coated oriented polypropylene resin film (KOP) of 20 μm and an oriented polypropylene resin film (OPP) of 50 μm was coated with an acrylic resin-based adhesive on the OPP surface. The adhesive strength of the adhesive sheet after resealing is 1 N/15 mm.

A U-shaped notch as shown in FIG. 4 was formed in the cover member. The length of the U-shape is 150 mm and the width of the U-shape is 70 mm. According to the first embodiment, the lid was not cut. The adhesive sheet was provided with notches as shown in FIG. The cut length L was 30 mm, and the cut position d was 3 mm. The adhesive sheet has a length of 180 mm and a width of 90 mm.

After the lid material is heat-sealed to the container body and the adhesive sheet is attached, the adhesive sheet is peeled off together with the lid material, 150 g of chicken meat and the seasoning liquid are added from the second opening, and after resealing, it is microwaved at 600 W. After heating for 5 minutes, the state was observed and evaluated.

<Example 2>
A package was prepared in the same manner as in Example 1, except that the position d of the cut formed in the adhesive sheet was 5 mm, and evaluated in the same manner.

<Example 3>
A package was prepared in the same manner as in Example 1, except that the position d of the cut formed in the adhesive sheet was 7 mm, and evaluated in the same manner.

<Example 4>
A package was prepared and evaluated in the same manner as in Example 1, except that the length L of the cut formed in the adhesive sheet was 20 mm and the position d was 5 mm.

<Example 5>
A package was prepared and evaluated in the same manner as in Example 1, except that the length L of the cut formed in the adhesive sheet was 40 mm and the position d was 5 mm.

<Example 6>
Using the same material as in Example 1, a trial production and evaluation were performed based on the second embodiment in which the lid member was provided with cuts and the adhesive sheet was not provided with cuts. As shown in FIG. 9, the lid member was provided with a U-shaped cut and two cuts. The cut length L was 30 mm, and the position d was 3 mm. The adhesive sheet was not provided with cuts as shown in FIG. A package was prepared in the same manner as in Example 1 and evaluated in the same manner.

<Example 7>
A package was prepared and evaluated in the same manner as in Example 6, except that the length L of the cut formed in the lid material was 30 mm and the position d was 5 mm.

<Example 8>
A package was produced in the same manner as in Example 6, except that the length L of the cut formed in the lid member was 30 mm, and the position d was 7 mm, and was evaluated in the same manner.

<Example 9>
A package was produced in the same manner as in Example 6, except that the length L of the cut formed in the lid member was 20 mm, and the position d was 5 mm, and was evaluated in the same manner.

<Example 10>
A package was prepared and evaluated in the same manner as in Example 6, except that the length L of the cut formed in the lid material was 40 mm and the position d was 5 mm.

<Comparative Example 1>
A package was prepared and evaluated in the same manner as in Example 1, except that the length L of the cut formed in the adhesive sheet was 30 mm and the position d was 1 mm.

<Comparative Example 2>
A package was prepared and evaluated in the same manner as in Example 1, except that the length L of the cut formed in the adhesive sheet was 30 mm and the position d was 9 mm.

<Comparative Example 3>
A package was prepared and evaluated in the same manner as in Example 1, except that the length L of the cut formed in the adhesive sheet was 10 mm and the position d was 5 mm.

<Comparative Example 4>
A package was produced and evaluated in the same manner as in Example 6, except that the length L of the cut formed in the lid member was 30 mm and the position d was 1 mm.

<Comparative Example 5>
A package was produced and evaluated in the same manner as in Example 6, except that the length L of the cut formed in the lid member was 30 mm and the position d was 9 mm.

<Comparative Example 6>
A package was produced in the same manner as in Example 6, except that the length L of the cut formed in the lid member was 10 mm, and the position d was 5 mm, and evaluated in the same manner.

The above results are summarized in Table 1.

From the results in Table 1, it can be seen that the package according to the present invention can be pressure-cooked in a microwave oven in a state where the adhesive sheet is removed and resealed, and there is no risk of rupture or explosion.

DESCRIPTION OF SYMBOLS 1... Package 2... Container main body 3... Opening part 4... Lid material 5... U-shaped notch 6... Second opening part 7... Adhesive sheet 8... · Knob portion 9... Notch 10... Base material layer 11... Gas barrier layer 12... Sealant layer L... Length of notch d... Position of notch S... Water vapor

Claims (4)

A package in which the opening of the container body is sealed with a lid material,
The lid has a second opening formed by a U-shaped cut,
The entire second opening is sealed with an adhesive sheet,
It is possible to open the second opening by peeling the adhesive sheet from the U-shaped notch in the direction of the bottom of the U-shaped cut,
A notch having a length longer than 10 mm and penetrating the entire thickness of the adhesive sheet is provided between the side edge of the adhesive sheet and the side edge of the second opening,
The position of the incision is 3 mm or more inside and 7 mm or less from the side edge of the adhesive sheet,
A package, wherein the adhesive strength is 2 N/15 mm or less when the adhesive sheet is peeled off and resealed. A package in which the opening of the container body is sealed with a lid material,
The lid has a second opening formed by a U-shaped cut,
The entire second opening is sealed with an adhesive sheet,
It is possible to open the second opening by peeling the adhesive sheet from the U-shaped notch in the direction of the bottom of the U-shaped cut,
The lid material is provided with a cut extending through the lid material and having a length longer than 10 mm between the side edge of the second opening and the side edge of the adhesive sheet,
The position of the incision is 3 mm or more inside and 7 mm or less from the side edge of the adhesive sheet,
A package, wherein the adhesive strength is 2 N/15 mm or less when the adhesive sheet is peeled off and resealed. 3. The package according to claim 1, wherein the lid material and the adhesive sheet contain a gas barrier layer that does not contain a metal foil or a metal deposition layer. The package according to any one of claims 1 to 3, wherein the adhesive sheet has a tab for peeling from the bottom of the U-shaped incision.

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