WO2008053927A1

WO2008053927A1 - Package body and container

Info

Publication number: WO2008053927A1
Application number: PCT/JP2007/071242
Authority: WO
Inventors: Masao Saito
Original assignee: Tachibana Packaging Co., Ltd.
Priority date: 2006-11-02
Filing date: 2007-10-31
Publication date: 2008-05-08
Also published as: CN101583546B; KR101407412B1; KR20090081378A; JP4347407B2; HK1137715A1; CN101583546A; JPWO2008053927A1

Abstract

A package body having capabilities of externally discharging gas produced from the contents, uniformly heating the contents, and preventing an occurrence of a recess in a container after heating, and the package body with such capabilities is realized by a simple structure. In the package body (100), the contents (130) received in the container is sealed by adhering a resin film (120) to a first adhesion part (111) at the upper edge of the container (110). First projections (112) projecting into the container (110) and in contact with the lower surface of the resin film (120) are formed on a container wall. On the upper surfaces of the first projections (112) are provided through-holes (113) extending through the container wall, annular second adhesion parts (114) for weakly adhering portions surrounding the through-holes (113) to the lower surface of the resin film (120), and second projections (115) projecting to a level higher than the upper edges of the second adhesion parts (114). When the internal pressure of the container (110) is increased, the resin film (120) swells upward to peel off the second adhesion parts (114), causing gas in the container (110) to be discharged to the outside of the container (110) through the through-holes (113).

Description

Specification

Packaging and containers

Technical field

[0001] The present invention relates to a package capable of releasing gas generated from the contents to the outside of the container, and a container used for the package.

Background art

[0002] Foods such as lunch boxes and side dishes are often sold in the form of a package sealed inside a resin container in order to prevent contamination by foreign substances or to prevent deterioration in quality. Many of these foods are made so that they can be cooked in the form of a package in a microwave oven or the like. However, if the food is heated in a state of being sealed inside the container, the container may swell and burst due to water vapor generated from the food at that time. In addition, fermented foods such as kimchi generate carbon dioxide as the fermentation progresses, and the container may rupture without heating the container. In view of this situation, in recent years, containers have been developed that can discharge water vapor or carbon dioxide generated from the contents to the outside.

[0003] For example, Patent Document 1 includes a flexible container having a through hole in at least one place, and a sheet-like pressure regulating valve bonded so as to close the through hole. The automatic cooking package is characterized in that the sheet-like pressure regulating valve opens when the internal pressure of the container becomes a certain level or more. However, in the automatic control package of Patent Document 1, in order to provide the sheet-like pressure regulating valve, it is necessary to stick a flexible sheet formed separately from the flexible container to the flexible container. It was. For this reason, the automatic cooking package of Patent Document 1 has a drawback that the manufacturing process becomes complicated and the manufacturing cost immediately increases.

[0004] Also, in Patent Document 2, a through-hole is provided in the lid, and a band seal is wrapped around the container body and the lid to close the through-hole. A packaging container is described in which the band seal around the through-hole is pushed up by the upward movement. However, the packaging container of Patent Document 2 is provided on the container body and the lid. Because it was necessary to tighten the band, it had to be removed because the production cost was high! /, And the unpacking operation was troublesome!

[0005] Further, Patent Document 3 includes a container provided with a protrusion inside, a cooked processed food housed inside the container, and a resin film thermally welded to the upper end of the side wall of the container. A food product in a packaging container is described in which a through-hole is provided through the top and bottom surfaces and the through-hole is covered with the resin film.

[0006] Furthermore, Patent Document 4 discloses a package that is sealed by adhering the lower surface of the resin film to the upper edge of the opening of the container body containing the contents, and penetrates the container wall of the container body. A hole is provided, an annular convex portion is formed on the upper edge of the through hole, the upper surface of the convex portion and the lower surface of the resin film are brought into close contact with each other, and the gas generated from the contents is passed through the through hole. A package that can be released to the outside is described.

[0007] Despite the relatively simple structure of the food contained in the packaging container of Patent Document 3 and the package of Patent Document 4, the gas generated from the contents is released from the through hole provided in the container. However, it still had the following drawbacks. In other words, the food contained in the packaging container of Patent Document 3 and the package of Patent Document 4 are not suitable for cases where the gas flow generated inside the container stays locally or is immediately heated in a microwave oven. The temperature difference was likely to occur depending on the location. This temperature difference can cause uneven heating in the contents and can also reduce the taste of the cooked food.

[0008] Further, the food in a packaging container of Patent Document 3 and the package of Patent Document 4 are heated immediately after the gas inside the container is released from the through-hole force and the internal pressure of the container is lower than the external pressure. There was a possibility that the container was recessed inside later. These defects are not limited to food in the packaging container of Patent Document 3 and the packaging body of Patent Document 4, but to other packaging bodies such as the automatic cooking receptacle of Patent Document 1 and the packaging container of Patent Document 2! / But it was solved! /

Patent Document 1: Japanese Patent Laid-Open No. 6-329179

Patent Document 2: Japanese Patent Laid-Open No. 2000-344267

Patent Document 3: Japanese Utility Model Publication No. 3-60279

Patent Document 4: Japanese Patent Laid-Open No. 2003-221078 Disclosure of the invention

Problems to be solved by the invention

[0010] The present invention has been made in order to solve the above-described problems, and is a container that can be realized simply by realizing a packaging body that can discharge the gas generated from the contents to the outside of the container with a simple structure. When a gas is released from a through-hole provided in a wall, a gas flow is generated in the entire interior of the container, and a package capable of uniformly heating the contents is provided. It is also an object of the present invention to provide a package that does not easily dent inside even after the gas inside the container has been released from the through hole. Furthermore, it is also an object of the present invention to provide a container that can be suitably used for constituting the package.

Means for solving the problem

[0011] The above-described problem is a package that seals the contents contained in a container by adhering the lower surface of the resin film to a first adhesive portion that is annularly provided along the upper edge of the container. A first protruding portion that protrudes into the container and contacts the lower surface of the resin film is formed on the wall. A resin film is formed on the upper surface of the first protruding portion with a through-hole penetrating the container wall and a portion surrounding the through-hole. When the internal pressure of the container is increased, an annular second adhesive portion for weakly adhering to the lower surface of the container and a second protruding portion protruding higher than the upper edge of the second adhesive portion are provided. This is solved by providing a packaging body characterized in that the second adhesive part peels off and the gas inside the container is released to the outside of the container through the through hole.

[0012] Thereby, the gas flow generated inside the container when the gas is released from the through hole provided in the container wall can be controlled by the second protrusion. Accordingly, it is possible to cause a gas flow to occur throughout the container, and it is possible to efficiently release the gas from the inside of the container simply by heating the contents uniformly. In addition, when the resin film swelled upward due to the internal pressure of the container returns to its original state, the resin film can be temporarily supported by the second protruding portion, and the gas outside the container is supplied to the container. It will also be possible to allow natural inflow. Therefore, it is possible to prevent the container from being recessed inward after the gas inside the container is released from the through-hole force.

[0013] Here, in the 'second adhesive portion for weakly adhering to the lower surface of the resin film' Indicates that the adhesive strength of the resin film at the second adhesive portion is lower than the adhesive strength of the resin film at the first adhesive portion. In this way, by keeping the resin film weakly attached at the second adhesive portion, the internal pressure of the container increased by heating the package while maintaining the airtightness inside the container at normal times. In this case, it is possible to make only the second adhesive part peel off. In the first bonding portion, the resin film is usually bonded with such an adhesive strength that it cannot be removed unless it is intentionally peeled off by human hands.

[0014] In the package, the position where the through hole is provided is not particularly limited, but it is preferably provided at a position 5 mm or more away from the upper edge (outer edge) of the container toward the center! / ,. Since the package is generally carried near the upper edge (outer edge) of the container, if the through hole is close to the upper edge (outer edge) of the container, This is because the hot air generated from the through holes may be easily touched with the finger.

[0015] The position where the second projecting portion is provided is not particularly limited, but it is preferable that the second projecting portion is disposed on the container center side when viewed from the through hole. As a result, the gas present in the center of the container can be allowed to reach the through-hole after bypassing the second protrusion, and the temperature inside the container can be kept more uniform. . The distance from the through hole to the second protrusion is not particularly limited, but if the through hole and the second protrusion are too far apart, it may be difficult to control the flow of gas that reaches the through hole. . For this reason, the second protrusion is usually disposed in a region having a radius of 30 mm or less from the center of the through hole.

[0016] The height from the tip of the second adhesive portion to the tip of the second protrusion is not particularly limited, but if it is too low, the gas flow may not be bypassed at the second adhesive portion. On the other hand, if the height to the tip of the second protrusion is too high, a local force tends to be applied to the resin finome and the resin film may be easily broken. For this reason, the height from the tip of the second adhesive portion to the tip of the second protrusion is usually set to 0.;! To 3 mm.

[0017] It is also preferable that a slit is formed in the second protrusion. As a result, it becomes possible to easily introduce the gas outside the container into the container from the through hole, and it is possible to further prevent the container from being recessed inside after the heating. Therefore, the container wall can be made thin, so that the amount of material required to form the container can be kept small, and the container It also becomes easy to reduce the manufacturing cost.

[0018] It is also preferable that the inside of the container is partitioned by a partition wall, and the first projecting portion is continuously provided on the partition wall. As a result, the inside of the container can be divided into a plurality of compartments, and the contents can be divided and accommodated according to the type and size thereof, and the limited space inside the container can be efficiently used. Can be used. It is also possible to increase the strength of the container. Furthermore, the packaging body in which the inside of the container is partitioned into a plurality of compartments as described above has a significant difference in temperature between the compartments during heating, and the significance of adopting the configuration of the present invention immediately increases. This configuration is preferably used when food such as lunch boxes and side dishes are stored as contents.

[0019] Further, the above-described problem is a container in which a first bonding portion for bonding the lower surface of the resin film is provided in an annular shape along the upper edge. A first protrusion reaching the same height as the edge is formed, and a through hole penetrating the container wall on the upper surface of the first protrusion and a ring for adhering a portion surrounding the through hole to the lower surface of the resin film This can also be solved by providing a container characterized in that a second adhesive portion and a second protrusion protruding above the upper edge of the second adhesive portion are provided. This container can be suitably used for the package.

The invention's effect

[0020] As described above, according to the present invention, it is possible to realize a package capable of releasing the gas generated from the contents to the outside of the container with a simple structure with a small number of parts. It is also possible to provide a package that can heat the contents uniformly by generating a gas flow in the entire interior of the container when gas is released from the through hole provided in the container wall. . Furthermore, it is possible to provide a container that is difficult to dent inside even after the gas inside the container is released from the through hole. Furthermore, it is possible to provide a container that can be suitably used to configure the package.

Brief Description of Drawings

FIG. 1 is a perspective view showing a preferred embodiment of the package of the present invention.

FIG. 2 is a perspective view showing a preferred embodiment of the container of the present invention.

FIG. 3 is a plan view of the container shown in FIG. 2 as viewed from above. 4 is an enlarged view of the periphery of the left through hole in the container shown in FIG. 3.

5] FIG. 5 is a cross-sectional view showing a state in which the periphery of the left through-hole in the container shown in FIG. 4 is cut along the YY plane.

6] FIG. 5 is a cross-sectional view showing a state in which the periphery of the left through-hole in the package body before starting heating or immediately after starting heating is cut along a plane corresponding to the YY plane in FIG.

7] FIG. 5 is a cross-sectional view showing a state in which the periphery of the left through-hole in the package after a while from the start of heating is cut by a plane corresponding to the YY plane in FIG.

FIG. 8 is a graph showing the results of measuring the temperatures, and T of water in compartments a and b when the package of the present invention is heated in a microwave oven.

b

FIG. 9 is a graph showing the results of measuring the temperatures 水の and T of water in compartments a and b when the package of the comparative example was heated in a microwave oven.

b

Explanation of symbols

100 package

110 valley ¾f

111 First adhesive part

112 First protrusion

113 Through hole

114 Second adhesive part

115 Second protrusion

116 partition wall

117 Communication groove

120 Resin fill

130 Contents

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the package of the present invention and the container used therefor will be described more specifically with reference to the drawings. FIG. 1 is a perspective view showing a preferred embodiment of the package 100 of the present invention. FIG. 2 is a perspective view showing a preferred embodiment of the container 110 of the present invention. FIG. 3 is a plan view of the container 110 shown in FIG. 2 as viewed from above. Figure 4 shows in Figure 3 FIG. 6 is an enlarged view of the periphery of a left through-hole 113 in a container 110. FIG. 5 is a cross-sectional view showing a state in which the periphery of the left through-hole 113 in the container 110 shown in FIG. 4 is cut along the YY plane.

[0024] 1. Overall structure of package

As shown in FIG. 1, the packaging body 100 of the present embodiment is obtained by adhering the lower surface of the resin film 120 to a first adhesive portion 111 provided in an annular shape along the upper edge (outer edge) of the container 110. The contents 130 contained in 110 are sealed. A first protrusion 112 that protrudes into the container 110 and contacts the lower surface of the resin film 120 is formed on the container wall. Further, on the upper surface of the first projecting portion 112, a through hole 113 penetrating the container wall, and an annular second adhesive portion 1 14 for weakly bonding a portion surrounding the through hole 113 to the lower surface of the resin film 120, And a second protruding portion 115 protruding higher than the tip of the second adhesive portion 114 is provided.

[0025] 2. Contents

The type of the contents 130 is not particularly limited, but it is preferable that the contents 130 are required to be sealed in order to maintain quality, such as food. Among them, it is suitable for containing foods that generate gas such as water vapor and carbon dioxide.

[0026] The food that generates water vapor is not particularly limited as long as it contains water. Soups such as miso soup and stew, rice such as white rice and fried rice, rice cakes such as ramen and udon, Examples include meat dishes, vegetable dishes, and fish dishes. In particular, these foods, which are preferable for containing foods for cooking in a microwave oven, which are intended to be cooked in a microwave oven, are preferred as those that are stored frozen or refrigerated. In particular, the food for cooking in a microwave oven that has been cryopreserved has great significance in controlling the flow of water vapor so that the heating by the latent heat generated when the water vapor condenses is performed uniformly. It is suitable as the contents 130 of the package 100. When the food for cooking in a microwave oven is stored frozen, the portion of the ice that has been melted into water is heated by dielectric heating, while the portion of the ice that is heated is dielectrically heated. This is because uneven heating tends to occur depending on the location because it is easy to be heated and easily heated.

[0027] On the other hand, examples of foods that generate carbon dioxide include fermented foods such as kimchi and miso. The In the package 100 of the present embodiment, a lunch box type container is used for the container 110, and rice is contained in the compartment a (see FIG. 3) of the container 110, and the containers b to Each d contains a different kind of side dish!

[0028] 3. Container

The shape of the container 110 varies depending on the type of the contents 130 and is not particularly limited. As shown in FIG. 2, the container 110 according to this embodiment has a substantially box-like shape with the top opened. As shown in FIG. 3, the inside of the container is partitioned into a plurality of sections a to d by a partition wall 116. For this reason, the contents 130 can be accommodated in different sections a to d depending on the type and the like. Although the volume of the container 110 is not particularly limited, the container 110 of this embodiment has a section a of 270 cc, a section b and a d force S50 cc, and a section c of 130 cc, for a total of 500 cc. The arrangement of the compartments a to d is not particularly limited, but is preferably arranged in as symmetrical positions as possible, for example, so that the inner shape of the container 110 is symmetrical. Thereby, it becomes easier to control the gas flow inside the container, and the temperature difference between the compartments a to d during heating can be easily kept small. In the container 110 according to this embodiment, the compartments a to d are arranged symmetrically.

[0029] Of each part of the partition wall 116, the upper edge of the part that partitions the partition a and the partition b, the upper edge of the part that processes the partition a and the partition c, the upper edge of the part that partitions the partition a and the partition d, As shown in Fig. 2, the upper edge of the part that divides compartment b and compartment c and the upper edge of the part that separates compartment c and compartment d are formed to be recessed downward. A communication groove 117 that communicates a to d is provided. For this reason, the gas inside the container can pass through each compartment, and even when the package 100 is heated in a microwave oven, the temperature of each compartment a to d is kept uniform. It has become easier.

[0030] The material of the container 110 is not particularly limited as long as it can exhibit a strength that does not easily break even when the contents 130 are accommodated, but plastic containers having excellent productivity and sealability are usually adopted. The Examples of the plastic used for the container 110 include the power of polyolefin resins such as polyethylene and polypropylene, polyester resins, polyamide resins, polystyrene resins, polychlorinated burresins, and polyacrylonitrile resins. Among these, polypropylene is suitable because it is excellent in moldability, rigidity, and heat sealability. When the container 110 is required to have heat resistance, it is preferable to use polypropylene blended with an inorganic filler such as talc. As a result, the contents 130 can be retort-sterilized. In this case, the amount of the inorganic filler is usually set to 10 to 50% by weight. The method for forming the container 110 is not particularly limited, and examples thereof include vacuum forming, injection forming, and sheet thermoforming.

[0031] The thickness of the container wall is not particularly limited, but if it is too thin, the rigidity of the container 110 cannot be secured, and the container 110 may be greatly deformed when the internal pressure of the container 110 rises. . For this reason, the thickness of the container wall is usually set to 0.2 mm or more. The thickness of the container wall is preferably 0.3 mm or more, more preferably 0.4 mm or more. On the other hand, if the container wall is too thick, a large amount of material is required for the container 110, which increases the manufacturing cost of the container 110. For this reason, the thickness of the container wall is usually set to 1.2 mm or less. The thickness of the container wall is preferably 0.8 mm or less, and more preferably 0.6 mm or less. In the container 110 of this embodiment, the thickness of the container wall is 0.4 mm.

[0032] 4. First bonding part

The first bonding portion 111 is not particularly limited as long as it is provided in an annular shape along the upper edge (outer edge) of the container 110, and may be formed flat. In the container 110 of this embodiment, as shown in FIG. 2, protrusions are provided along the upper edge (outer edge) of the container 110. As a result, it is possible to easily adhere the lower surface of the resin film 120 along the first adhesive portion 111 with a uniform adhesive strength. The cross-sectional shape of the protrusions provided on the first adhesive portion 11 1 is not particularly limited, but the container 110 of the present embodiment has a substantially semicircular shape, and a crease is formed on the resin film 120 around the first adhesive portion 11 1. It is made difficult to be done. In addition, the height H of the ridges provided on the first adhesive portion 111 (see FIG. 5) is not particularly limited, but the container 110 according to this embodiment is!

For bonding the resin film 120 in the first bonding portion 111, an adhesive may be used. However, in consideration of productivity and hygiene, the resin film 120 and the container 110 are fused by thermal welding or vibration welding. I prefer to wear it! The adhesive strength of the resin film 120 in the first adhesive portion 111 is not particularly limited as long as it is higher than the adhesive strength of the resin film 120 in the second adhesive portion 114, but immediately after heating the package 100 with a microwave oven or the like, Easy pull Although it can be peeled off, it cannot be easily peeled off by hand when the package 100 is at normal temperature!

[0034] 5. First protrusion

The first projecting portion 112 may be provided at only one location on one container 110, but it is preferable to provide it at a plurality of locations as shown in FIG. As a result, the through holes 113 can be provided at a plurality of locations, so that the gas inside the container can be more efficiently discharged to the outside of the container. The arrangement of the first protrusions 112 is not particularly limited, but as with the arrangements of the sections a to d, the arrangement of the first protrusions 112 as symmetrically as possible makes it easier to reduce the temperature difference between the sections a to d during heating. Is preferred. In the container 110 of this embodiment, the first protrusions 112 are provided at both ends (the left end and the right end in FIG. 3) inside the container.

The height of the upper surface of the first protrusion 112 is set to be substantially the same as or slightly lower than that of the first adhesive portion 111. The first protrusion 112 may have a shape in which the bottom wall (lower container wall) of the container 110 protrudes upward, or the side wall (lateral container wall) of the container 110 faces inward. A protruding shape may be used. The first protrusion 112 having such a configuration can be easily formed, for example, when the container 110 is vacuum formed. In the container 110 of this embodiment, as shown in FIG. 2, the corner container wall formed by the bottom wall and the side wall of the container 110 protrudes upward inside the container 110. ing. The first protrusion 112 is formed continuously with the partition wall 116, and can also function as a partition. For this reason, the space inside the container can be used without waste.

[0036] 6. Through hole

As shown in FIG. 2, a through-hole 113 is provided in the vertical direction on the container wall forming the upper surface of the first protrusion 112. The position where the through hole 113 is provided is not particularly limited as long as it is the upper surface of the first protrusion 112, but it is preferable that the through hole 113 is provided at a position 5 mm or more away from the upper edge (outer edge) of the container 110 toward the center. . Since the package 100 is generally carried near the upper edge (outer edge) of the container 110, if the through hole 113 is close to the upper edge (outer edge) of the container 110, When carrying the package 100, it is released from the through-hole 113. This is because hot air may touch the fingers. The through-hole 113 is preferably 10 mm or more away from the upper edge (outer edge) of the container 110 toward the center! /, More preferably 15 mm or more! /. In the container 110 of this embodiment, a through hole 113 is provided at a position 20 mm away from the upper edge (outer edge) of the container 110 toward the center.

[0037] 7. Second adhesive portion

The second bonding portion 114 is not particularly limited as long as it is provided in an annular shape around the through hole 113 on the upper surface of the first protruding portion 112, and may be formed flat. In the container 110 of this embodiment, as shown in FIG. 2, the second adhesive portion 114 is provided with a ridge. Thereby, the lower surface of the resin film 120 can be easily bonded along the second bonding portion 114 with a uniform bonding strength. The cross-sectional shape of the ridges provided on the second adhesive portion 114 is not particularly limited, but the container 110 of this embodiment has a substantially semicircular shape, like the first adhesive portion 111. Also, the height H of the ridges provided on the second adhesive portion 114 (see Fig. 5).

2) is not particularly limited, but is about 0.4 mm in the container 110 of this embodiment. Further, the radius at which the protrusions of the second adhesive portion 114 are provided is not particularly limited, but is about 6 mm in the container 110 of the present embodiment, and the protrusions between the through hole 113 and the second protrusion 115 are provided. Is getting through.

[0038] Although the adhesive may be used for bonding the resin film 120 in the second bonding portion 114, it is preferably fused by thermal welding or vibration welding similarly to the first bonding portion 111. The adhesive strength of the resin film 120 at the second adhesive portion 114 is not particularly limited as long as it is lower than the adhesive strength of the resin film 120 at the first adhesive portion 111. As a method for making the adhesive strength at the second adhesive portion 114 lower than the adhesive strength at the first adhesive portion 111, for example, when the resin film 120 is thermally welded, the sealing temperature at the second adhesive portion 114 is set. Examples include a method in which the seal pressure is lower than the sealing temperature and the sealing pressure in the first bonding portion 111, and a method in which the bonding area in the second bonding portion 114 is smaller than the bonding area in the first bonding portion 111. The

[0039] 8. Second protrusion

The second protrusion 115 is not particularly limited as long as it can control the flow of gas reaching the through hole 113, but is substantially perpendicular to the radial direction of the through hole 113. It is preferable that it is a wall-like thing provided. This makes it possible to more reliably control the gas flow inside the container. In the container 110 of this embodiment, as shown in FIG. 2, a wall-like second protrusion 115 that is perpendicular to the radial direction of the through hole 113 is provided in a substantially arc shape with the through hole 113 as the center. The second projecting portion 115 is disposed on the center side of the container 110 when viewed from the center of the through hole 113. For this reason, the inside of the container can be allowed to reach the through-hole 113 after bypassing the second protrusion 115, and when the gas inside the container is released to the outside of the container, It is possible to generate a large gas flow.

[0040] The distance from the through hole 113 to the second protrusion 115 is not particularly limited. However, if the through hole 113 and the second protrusion 115 are too close, the resin film 120 can be neatly bonded by the second bonding portion 114. There is a risk of disappearing. For this reason, the second protrusion 115 is usually disposed in a region having a radius of 5 mm or more from the center of the through hole 113. The second protrusion 115 is more preferably disposed in a region having a radius of 7 mm or more from the center of the through hole 113. On the other hand, if the through-hole 113 and the second protruding portion 115 are too far apart, the flow of gas reaching the through-hole 113 is controlled, and the internal temperature of the container 110 may easily vary. . For this reason, the second protrusion 115 is usually arranged in a region having a radius of 30 mm or less from the center of the through hole 113. The second projecting portion 115 is preferably arranged in a region having a radius of 20 mm or less from the center of the through hole 113, and more preferably in a region having a radius of 15 mm or less. In the present embodiment, the second projecting portion 115 is provided at a location about 10 mm away from the center of the through hole 113.

[0041] The height H from the tip of the second adhesive portion 114 to the tip of the second protrusion 115 (see FIG. 5).

3) is not particularly limited, but if the second protrusion 115 is too low, there is a possibility that the gas flow cannot be bypassed by the second adhesive portion 114. For this reason, the height H is usually 0.

Three

Set to lmm or more. The height H is preferably 0.3 mm or more and 0.5 mm or more.

Three

More preferably. On the other hand, if the height H from the tip of the second adhesive portion 114 to the tip of the second protrusion 115 is too high, local force is easily applied to the resin film 120, and the resin film

Three

120 may be easily broken. For this reason, the height from the tip of the second adhesive portion to the tip of the second protrusion is usually set to 3 mm or less. Height H is 2mm or less

Three

And preferably 1 mm or less. In the container 110 of this embodiment, the height H Is 0 · 6mm.

Three

[0042] 9. Slit

By the way, in the container 110 of this embodiment, as shown in FIG. 4, a slit is formed at a substantially central portion in the longitudinal direction of the second projecting portion 1 15. For this reason, when the resin film 120 that has been swollen upward due to the release of gas from the through-hole 113 and the internal pressure of the container 110 being lowered returns to the original state, the gas outside the container naturally flows into the container. It is possible to flow in (arrow C in FIG. 4), so that deformation of the container 110 after heating can be prevented. One slit may be provided in one second protrusion 115, or a plurality of slits may be provided in one second protrusion 115.

[0043] The width of the slit varies depending on the distance from the through hole 113 to the second protrusion 115, the volume of the container 110, and the like, and is not particularly limited. However, if the slit width is too narrow, the gas outside the container 110 may be introduced into the container 110 when the resin film 120 returns to its original state. For this reason, the width of the slit is usually set to 0.5 mm or more. The width of the slit is preferably 1 mm or more, more preferably 1.5 mm or more. On the other hand, if the slit is too wide, the gas flow inside the container 110 may not be controlled by the second protruding portion 115. For this reason, the width of the slit is usually set to 5 mm or less. The width of the slit is preferably 4 mm or less, more preferably 3 mm or less. In the container 110 of this embodiment, the width of the slit is about 2 mm.

[0044] 10. Resin film

The material of the resin film 120 is not particularly limited, and various resins can be used. The resin Finolem 120 may be a single layer film or a multilayer film. Among them, a multilayer film in which a heat seal layer is superimposed on a biaxially stretched resin layer is suitable as the resin film 120. This is because this type of multilayer film is excellent in heat-sealability as well as being able to withstand heating by a microwave oven with little deformation due to heat. The resin film 120 of this embodiment is a multilayer film in which a base material layer made of biaxially stretched polypropylene, an oxygen barrier resin layer made of polyacrylonitrile resin, and a heat seal layer made of polyethylene resin are laminated. Yes. The lower surface (heat seal layer) of the resin film 120 is thermally welded to the first adhesive portion 111 provided in an annular shape along the upper edge of the container 110. Is done.

[0045] The thickness of the resin film 120 is not particularly limited, but if it is too thin, the resin film 120 may be easily broken. For this reason, the total thickness of the resin film 120 is normally set to 3 C ^ m or more. The total thickness of the resin film 120 is preferably 55 m or more, more preferably 60 m or more. On the other hand, if the resin film 120 is too thick, even if the internal pressure of the container 110 increases, the resin film 120 bulges outward and the second adhesive portion 114 may not be easily peeled off. For this reason, the total thickness of the resin film 120 is normally set to 80 m or less. The total thickness of the resin film 120 is preferably 70 m or less, more preferably 65 m or less. The total thickness of the resin film 120 of this embodiment is 60 μm!

[0046] 11. Operation

Next, an operation when the package 100 is heated in a microwave oven will be described. FIG. 6 is a cross-sectional view showing a state in which the periphery of the left through-hole 113 in the package 100 before the start of heating or immediately after the start of heating is cut by a plane corresponding to the Y-Y plane in FIG. FIG. 7 is a cross-sectional view showing a state in which the periphery of the left through-hole 113 in the package 100 after cutting for a while from the start of heating is cut by a plane corresponding to the Y-Y plane in FIG.

[0047] Before or immediately after heating the package 100, as shown in FIG. 6, the resin film 120 is bonded by the second bonding portion 114, and the through hole 113 is blocked by the resin film 120. It is in the state. The gas inside the container flows naturally between the compartment with the high temperature and the compartment with the low temperature through the communication groove 117 provided at the upper edge of the partition wall 116. Can be secured between each section. For this reason, a large temperature difference is prevented from occurring in the contents 130 accommodated in each section.

[0048] After a while from the start of heating of the package 100, water vapor is generated from the contents 130, and the internal pressure of the container 110 begins to rise. The resin film 120 starts to bulge upward due to the internal pressure of the container 110. When the swelling of the resin film 120 reaches the limit, the resin film 120 is peeled off at the second adhesive portion 114 that has been weakly adhered, and the inside of the container and the outside of the container are communicated with each other through the through-hole 113 as shown in FIG. It becomes a state. The second was strongly bonded In the one adhesive part 111, the resin film 120 is still adhered.

[0049] When the inside of the container and the outside of the container communicate with each other through the through hole 113, the gas inside the container is released to the outside of the container through the through hole 113 (arrow D in FIG. 7). As shown by arrows A and B in FIG. 4, the gas released to the outside of the container bypasses the second protrusion 115 and reaches the through hole 113 inside the container. When gas is released from the container, a large gas flow is generated inside the container. For this reason, the temperature of the contents 130 accommodated in each compartment is easily maintained uniformly.

[0050] By the way, if the through-hole 113 is closed immediately after the gas is released from the through-hole 113, the internal pressure of the container 110 becomes lower than the external pressure due to condensation or contraction of the gas inside the container, and after heating, The container 110 may be recessed inside. However, in the package 100 of the present invention, the resin film 120 around the through hole 113 is supported by the second protrusion 115 even after the gas is released from the through hole 113. For this reason, the gas outside the container naturally flows into the container again through the through-hole 113, and the internal pressure of the container 110 does not drop significantly after the package 100 is heated! / ! / The gas introduced into the container can quickly reach the center of the container 110 by passing through a slit provided in the second projecting portion 115 connecting only around the through hole 113. (Arrow C in Figure 4). For this reason, the dent of the container 110 after heating can be prevented more reliably.

[0051] 12. Experiment

In order to demonstrate that the package 100 of the present invention can uniformly heat the contents 130, the package 100 containing water as the contents 130 is heated in a microwave for 6 minutes, (Refer to Fig. 3) and temperature sensor previously stored in compartment b (see Fig. 3), the temperature of water in compartment a (T) and the temperature of water in compartment b (T) An experiment was conducted to measure each. Ward a b

®ai 90 ml of water, compartment b, 30 ml of water, 50 ml of water. The output of the microwave oven was set to 500W. Further, as a comparative example, the same measurement was performed for a package using the same container as the container 110 shown in FIG. 3 except that the second protrusion 115 was provided! / ,! It was.

[0052] FIG. 8 shows the water in compartments a and b when the package 100 of the present invention is heated in a microwave oven. It is the graph which showed the result of having measured temperature T and Τ, respectively. Figure 9 shows a comparative example package ab

The temperature 温度 and T of the water in the compartments a and b were measured when heated in the microwave.

a b

It is the graph which showed the result. In FIG. 8 and FIG. 9, the elapsed time is the elapsed time from the start of heating in the microwave oven, and T is the temperature of the air outside the container.

As shown in FIG. 8, in the package 100 of the present invention, the temperature T of the water in the compartment a and the temperature T of the water in the compartment b are approximately equal at around 100 ° C after about 200 seconds from the start of heating by the microwave oven. Natsute

a b

The power of S On the other hand, as shown in FIG. 9, it can be seen that the comparative example of the package has a force of about 250 seconds until the temperature T of the water in the compartment a and the temperature T of the water in the compartment b become substantially equal. ab

The Further, the packaging body of the present invention has a difference between the temperature τ and the temperature T, compared to the packaging body of the comparative example.

a b You can also see that it is getting smaller overall. From the above measurement results, it can be seen that the package 100 of the present invention can heat the contents 130 uniformly.

Claims

The scope of the claims

[1] A package in which contents contained in a container are sealed by adhering a lower surface of a resin film to a first adhesive portion provided in an annular shape along an upper edge of the container,

A first protrusion that protrudes into the container and contacts the lower surface of the resin film is formed on the container wall,

A through hole penetrating the container wall on the upper surface of the first projecting portion, an annular second adhesive portion for weakly adhering a portion surrounding the through hole to the lower surface of the resin film, and an upper edge of the second adhesive portion And a second protrusion protruding higher than

When the internal pressure of the container is increased, the resin film swells upward to peel off the second adhesive portion, and the gas inside the container is released to the outside of the container through the through hole. body.

[2] The package according to [1], wherein the second projecting portion is disposed on the container center side when viewed from the through hole.

[3] The package according to claim 1 or 2, wherein the second protrusion is disposed in a region having a radius of 30 mm or less from the center of the through hole.

[4] The package according to any one of the above items;! To 3mm, wherein the height from the second adhesive portion to the tip of the second protruding portion is 0.

[5] The package according to any one of claims 1 to 4, wherein the through hole is provided at a position 5 mm or more away from the upper edge of the container toward the center.

[6] The packaging body according to any one of [5] to [5], wherein the inside of the container is partitioned by a partition wall, and the first projecting portion is continuously provided on the partition wall.

[7] The package according to any one of [1] to [6], wherein a slit is formed in the second protrusion.

[8] A container in which a first bonding portion for bonding the lower surface of the resin film is provided in an annular shape along the upper edge,

A first protrusion is formed on the container wall that protrudes into the container and reaches the same height as the upper edge of the container.

From the upper surface of the first projecting portion, a through hole penetrating the container wall, an annular second adhesive portion for adhering the portion surrounding the through hole to the lower surface of the resin film, and an upper edge of the second adhesive portion Too high A container provided with a protruding second protruding portion.