CN111278746B - container - Google Patents

Abstract

Provided is a container provided with: a first container body including a recess and a flange portion formed along a peripheral edge of the recess and extending outward from the peripheral edge; and a second container body joined to the first container body in a joining region formed in the flange portion to form an internal space between the first container body and the recess portion, wherein a structure that facilitates peeling of the second container body from the first container body by an external force and resists an internal pressure of the internal space is provided between the first container body and the second container body, and a vapor passage portion that enables communication between the internal space and the external space when the internal pressure of the internal space increases is formed in the joining region.

Description

container

technical field

The present invention relates to containers.

Background technique

In a container including a container body and a lid body for food or the like, it is not easy to achieve both the sealing performance and the unsealing performance of the container, that is, the lid body can be easily peeled off from the container body at the time of opening. This is because when the bonding strength between the container body and the lid is increased, the sealing performance is improved but the opening performance is lowered, and conversely, when the bonding strength is weakened, the opening performance is improved but the sealing performance is lowered. Various techniques for solving such a problem have been proposed previously.

For example, Patent Document 1 proposes a technique in which, in a container composed of a container body and a lid body joined to a flange portion of the container body, any layer of a laminate forming the container body and the lid body is formed. The cohesive strength is smaller than the bonding strength between the container body and the lid, and a resin reservoir is formed near the inner peripheral edge of the junction between the container body and the lid. By cohesively breaking any one of the layers of the laminate forming the container body and the lid at the junction region of the container body and the lid, the unsealing property can be improved without weakening the bonding strength between the container body and the lid.

In addition, for example, Patent Document 2 and Patent Document 3 propose a technique in which, in a container composed of a container body and a lid joined to a flange portion of the container body, a container body formed of a multi-layer sheet is formed. The interlayer adhesion between the inner and outer layers is smaller than the adhesion between the container body and the lid, and the inner layer of the flange portion on the container opening side is provided with a cutout. By peeling the container body between layers at the junction region of the container body and the lid formed on the outer side of the cutout, the unsealing property can be improved without weakening the bonding strength between the container body and the lid.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent No. 5001962

Patent Document 2: Japanese Patent Laid-Open No. 62-251363

Patent Document 3: Japanese Patent Laid-Open No. 63-78

SUMMARY OF THE INVENTION

The problem to be solved by the invention

On the other hand, there is known a container which can be put into a microwave oven without opening the package to heat contents such as food. In such a container, the lid body is usually provided with an opening for discharging steam so that the container does not rupture when the internal pressure rises due to the steam generated from the heated contents. Since the airtightness of the container is lost due to the provision of the opening, the techniques of the above-mentioned Patent Documents 1 to 3 are not used for such a container.

Originally, in the container as described above, the heating efficiency can be improved by making the size and number of openings the minimum required and filling the container with water vapor. However, the heating in the microwave oven varies greatly depending on the model and individual, and it is difficult to accurately predict the internal pressure generated during heating. Therefore, in order to reliably prevent the rupture of the container, larger or more openings are often provided, resulting in a low heating efficiency.

Then, one of the objects of the present invention is to provide a novel and improved container capable of preventing rupture of the container and improving the heating efficiency of a container capable of heating the contents without opening the container.

solutions to problems

According to one aspect of the present invention, there is provided a container including: a first container body including a concave portion and a flange portion formed along a peripheral edge of the concave portion and extending outward from the peripheral edge; and a second container main body through which An inner space is formed between the first container body and the recessed portion by engaging with the first container body in the joining region formed in the flange portion, wherein a first container body is provided between the first container body and the second container body to allow the first container body to be moved by an external force. The second container body is easily peeled from the first container body and has a structure that resists the internal pressure of the internal space, and a vapor passage portion that can communicate the internal space and the external space when the internal pressure of the internal space rises is formed in the joint region.

According to the above-mentioned structure, the bonding strength between the container main body and the lid body can be enhanced without impairing the openability. By forming a steam passage portion in such a container, the rupture of the container is prevented by discharging water vapor to the outside when the contents are heated, and the interior space is filled with water vapor by limiting the amount of water vapor released from the steam passage portion, and By raising the internal pressure to a certain level, the heating efficiency of the content can be improved.

In addition to the above-mentioned container, the first container body may be composed of a laminate including at least a first layer and a second layer bonded to the first layer and facing the bonding region, and the second container body may be composed of at least a layer including a second layer facing the bonding region. The third layer in the bonding region and the fourth layer bonded to the third layer are composed of a laminate, and either the second layer or the third layer is a cohesive failure layer, and the cohesive failure layer has a higher cohesive strength than the second layer. The bonding strength between the container body and the first container body, the cohesive strength of the layers other than the cohesive failure layer from the first to fourth layers, and between the first layer and the second layer, and the third layer The interlayer bonding strength with the fourth layer is weak, and a first resin with a tumor-like cross-section inclined toward the recessed portion is formed at the edge portion of the bonding region on the recessed portion side. A reservoir portion, and a second resin reservoir portion having a bulge-shaped cross-section that is formed of the resin of the third layer and is located on the side of the concave portion relative to the first resin reservoir portion. In this case, the vapor passage portion may include a portion where the first resin storage portion and the second resin storage portion are not formed locally.

In addition to the above container, the first container body may be composed of a laminate including at least a first layer and a second layer, the second container body is joined to the second layer, and the second container body and the second layer may be The bonding strength between the two layers is stronger than the interlayer bonding strength between the second layer and the first layer, and a defect portion of the second layer is formed at a position closer to the concave portion than the bonding region. In this case, in the defect portion, at least the second layer may be formed with a notch, or the second layer may be locally thinned, or the second layer may be partially interrupted. In addition, in this case, the first container body may include a skirt portion formed on the peripheral edge of the flange portion, and a stepped portion formed by a part of the peripheral edge of the skirt portion extending and protruding further parallel to the flange portion, In addition to the joining area, the two container bodies are joined to the second layer in an additional joining area located at the stepped portion. Alternatively, the first container body may include a skirt portion formed on the peripheral edge of the flange portion, and an additional missing portion of the second layer may be formed in the vicinity of the outer peripheral edge of the joint region. In addition, the joint region may include an annular portion formed with a relatively narrow width relative to the width of the flange portion, and an overhang portion extending from the annular portion toward the peripheral edge of the flange portion. In addition, at the end of the laminated body positioned at the peripheral edge of the flange portion, a drooping portion covering the end of the second layer may be formed at the end of the second layer.

In addition to the above-described container, the vapor passage portion may include an unbonded region where the second container body and the first container body are not joined, or may include a relatively weaker unit per unit of the second container body and the first container body. Area of bond strength The weak bond area of the bond.

On the basis of the above-mentioned container, the unjoined region or the weak joint region may traverse the joint region in the width direction.

On the basis of the above-mentioned container, the unjoined region or the weakly jointed region may be one or more slit-like regions.

In addition to the above-mentioned container, the unbonded region or the weakly bonded region may be formed in the region including the front end of the portion where the bonding region protrudes in the width direction, or the portion including the portion where the bonding region bulges in the width direction. the area inside the top of the .

In addition to the container described above, the vapor passage portion may include an unbonded region and a weakly bonded region arranged in parallel to each other in the width direction of the bonded region, and the unbonded region may form a smaller communication path than the weakly bonded region. In this case, the weak joint region may be formed over the entire circumference of the flange portion. In addition, the unbonded region and the weakly bonded region may be in close contact with each other in the width direction of the bonded region, or may be separated from each other.

In addition to the container described above, the vapor passage portion may include a plurality of mutually independent non-joining regions formed in a part of the circumferential direction of the joint region. In this case, the area per non-bonding region may be 0.1 mm ² or more.

ADVANTAGE OF THE INVENTION According to this invention, about the container which can heat the content without opening, the rupture of a container can be prevented, and heating efficiency can be improved.

Description of drawings

FIG. 1 is a perspective view of a container according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing an unsealing operation of the container shown in FIG. 1 .

FIG. 3A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 3B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 4A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 4B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 5A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 5B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 6A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 6B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 7A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 7B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 1 .

FIG. 8A is a view showing another example of the weakly bonded region formed in the container shown in FIG. 1 .

FIG. 8B is a view showing another example of the weakly bonded region formed in the container shown in FIG. 1 .

FIG. 8C is a diagram showing another example of the weakly bonded region formed in the container shown in FIG. 1 .

It is a figure for demonstrating the manufacturing method of the container which concerns on 1st Embodiment of this invention.

10 is a perspective view of a container according to a second embodiment of the present invention.

Fig. 11 is a partial cross-sectional view showing an unsealing operation of the container shown in Fig. 10 .

12 is a perspective view of a container according to a third embodiment of the present invention.

13 is a plan view of a container according to a fourth embodiment of the present invention.

FIG. 14A is a partial cross-sectional view of the container shown in FIG. 13 .

FIG. 14B is a partial cross-sectional view of the container shown in FIG. 13 .

15 is a perspective view of a container according to a fifth embodiment of the present invention.

FIG. 16 is a partial cross-sectional view of the container shown in FIG. 15 .

FIG. 17A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 17B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 18A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 18B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 19A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 19B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 20A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 20B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 21A is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

FIG. 21B is a diagram showing an example of a vapor passage portion formed in the container shown in FIG. 15 .

22 is a perspective view of a container according to a sixth embodiment of the present invention.

FIG. 23A is a partial cross-sectional view of the container shown in FIG. 8 .

FIG. 23B is a partial cross-sectional view of the container shown in FIG. 8 .

FIG. 23C is a partial cross-sectional view of the container shown in FIG. 8 .

24 is a plan view of a container according to a seventh embodiment of the present invention.

FIG. 25A is a partial cross-sectional view of the container shown in FIG. 24 .

FIG. 25B is a partial cross-sectional view of the container shown in FIG. 24 .

FIG. 25C is a partial cross-sectional view of the container shown in FIG. 24 .

FIG. 26 is a diagram showing a first modification of the embodiment of the present invention.

FIG. 27 is a diagram showing a first modification of the embodiment of the present invention.

FIG. 28 is a diagram showing a second modification of the embodiment of the present invention.

29 is an enlarged view showing a vapor passage portion of a container according to an eighth embodiment of the present invention.

30 is an enlarged view showing a vapor passage portion of a container according to a modification of the eighth embodiment of the present invention.

FIG. 31 is a graph showing the relationship between the burst pressure and the sealing temperature of the examples and the comparative examples.

Detailed ways

Hereinafter, suitable embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawings, the same code|symbol is attached|subjected to the component which has substantially the same functional structure, and the repeated description is abbreviate|omitted.

(first embodiment)

FIG. 1 is a perspective view of a container according to a first embodiment of the present invention. FIG. 1(A) shows a state before unsealing, and FIG. 1(B) shows a state during unsealing. FIG. 2 is a partial cross-sectional view showing an unsealing operation of the container shown in FIG. 1 . FIGS. 2(A) and 2(B) correspond to the states of FIGS. 1(A) and 1(B) , respectively.

The container 1100 according to the present embodiment includes a container body 1110 (first container body) and a lid body 1130 (second container body). The container main body 1110 has a substantially rectangular planar shape, and includes a concave portion 1111 and a flange portion 1112 formed along the periphery of the concave portion 1111 . The flange portion 1112 extends and protrudes outward from the peripheral edge of the recessed portion 1111 . The lid body 1130 is a film-like member that covers the opening of the recessed portion 1111 , and is bonded to the container body 1110 by heat sealing or ultrasonic sealing at the bonding region 1140 formed in the flange portion 1112 , thereby connecting with the recessed portion 1111 . An inner space SP is formed therebetween.

As shown in FIG. 2 , the container body 1110 forms the laminate 1114 including the base material layer 1114A, the subsurface layer 1114B, and the surface layer 1114C into a shape including the concave portion 1111 and the flange portion 1112 by vacuum forming, air pressure forming, or the like. The base material layer 1114A is located outside the container body 1110 and exhibits rigidity required for maintaining the shape of the container body 1110 . The subsurface layer 1114B is located between the substrate layer 1114A and the surface layer 1114C, and is bonded to the respective layers. The surface layer 1114C is located on the inner side of the container body 1110 , that is, on the side facing the inner space SP, and faces the joint region 1140 formed in the flange portion 1112 .

Here, the base material layer 1114A and the undersurface layer 1114B of the laminate 1114 are formed of, for example, a resin including at least any one of the group consisting of an olefin-based resin, a polystyrene-based resin, and a polyester-based resin. Polypropylene and polyethylene are exemplified as the olefin-based resin. Polyethylene terephthalic acid (PET) is exemplified as the polyester-based resin. For example, rigidity is different between the base material layer 1114A and the subsurface layer 1114B. In order to improve rigidity, an inorganic filler such as talc may be added to the base material layer 1114A.

On the other hand, the surface layer 1114C of the laminate 1114 is formed of, for example, a resin composition obtained by mixing at least one of an ethylene-acrylate-maleic anhydride copolymer or a styrene-grafted propylene resin with a polypropylene-based resin. In this case, the ethylene-acrylate-maleic anhydride copolymer or the styrene-grafted propylene resin is preferably added in an amount of 10 to 50 parts by mass, particularly preferably 15 to 40 parts by mass with respect to 100 parts by mass of the polypropylene-based resin. mass parts or so.

In the illustrated example, the laminate 1114 includes three layers of the base layer 1114A, the subsurface layer 1114B, and the surface layer 1114C, but in other examples, the laminate 1114 may include additional layers. For example, when high rigidity is required, the laminated body 1114 may include a plurality of base material layers and an adhesive layer for bonding the base material layers to each other. The adhesive layer is formed of, for example, a urethane-based elastomer, a styrene-based elastomer, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, or ethylene vinyl acetate (EVA). In addition, the laminated body 1114 may include a gas barrier layer that blocks oxygen or the like. The gas barrier layer is formed of, for example, ethylene-vinyl acetate copolymer saponification (EVOH), polyvinylidene chloride (PVDC), or polyacrylonitrile (PAN).

The lid body 1130 is composed of a film-like laminate 1131 including an outer layer 1131A and a sealing layer 1131B. The outer layer 1131A is located on the front side of the cover body 1130 , that is, the side not facing the container body 1110 , and exhibits flexibility and tensile strength necessary for the cover body 1130 . The outer layer 1131A is formed of, for example, a polyethylene terephthalate (PET) film, a biaxially stretched nylon film (O-Ny), or the like. On the other hand, the sealing layer 1131B is located on the back side of the lid body 1130 , that is, on the side facing the container body 1110 , and faces the joint region 1140 formed in the flange portion 1112 . The sealing layer 1131B is formed of, for example, a resin composition such as reinforced polypropylene (RPP), block polypropylene (BPP), linear low density polyethylene (LLDPE), or polyethylene. In this embodiment, the outer layer 1131A and the sealing layer 1131B are joined to each other. In addition, in other embodiment, an additional layer may be included in the laminated body 1131.

Here, in the present embodiment, the cohesive strength of the surface layer 1114C of the laminated body 1114 is weaker than the bonding strength between the lid body 1130 and the container body 1110 in the joining region 1140 , and is weaker than that of the laminated body 1114 and the laminated body 1131 . The cohesive strength of each layer other than the surface layer 1114C is weak, and is weaker than the interlayer bonding strength between the layers of the laminated body 1114 and the laminated body 1131 . In other words, when the subsurface layer 1114B is the first layer, the surface layer 1114C is the second layer, the sealing layer 1131B is the third layer, and the outer layer 1131A is the fourth layer, the The cohesive strength of the second layer is higher than the bonding strength between the cover body 1130 and the container body 1110 , the cohesive strength of the first layer, the third layer and the fourth layer, and between the first layer and the second layer and the third layer The interlayer bonding strength with the fourth layer is weak. Therefore, as will be described later, in the present embodiment, the container 1100 can be easily unsealed by using the surface layer 1114C as a cohesive breaking layer. In addition, in this specification, cohesive strength means the intensity|strength exhibited by the intermolecular force (cohesion force) which bonds resins which comprise each layer of a laminated body.

Moreover, in this embodiment, as shown in FIG. 2, the 1st resin storage part 1121 and the 2nd resin storage part 1122 are formed in the edge part of the concave part 1111 side of the bonding area|region 1140. The first resin storage portion 1121 is made of resin forming the lower surface layer 1114B and the surface layer 1114C of the laminate 1114 , and has a tumor-like cross-section inclined toward the recessed portion 1111 . The second resin storage portion 1122 is made of resin forming the sealing layer 1131B of the lid body 1130 , and has a knob-like cross-section located closer to the recessed portion 1111 than the first resin storage portion 1121 . As shown in the figure, the surface layer 1114C is formed along the surface of the first resin storage portion 1121 and passing through the gap between the first resin storage portion 1121 and the second resin storage portion 1122 . In the following description of the present embodiment, the first resin storage part 1121 and the second resin storage part 1122 are also collectively referred to as a resin storage part 1120 .

(Opening action of container)

Next, the unsealing operation of the container 1100 will be described. In the container 1100 , for example, at the corners of the substantially rectangular planar shape, the lid body 1130 extends and protrudes to a large extent from the peripheral edge of the flange portion 1112 . The user can easily start the unsealing of the container 1100 by grasping the end portion of the extended lid body 1130 and peeling off the lid body 1130 as shown in FIG. 2(A) from there.

Here, as described above, the cohesive strength of the surface layer 1114C is higher than the bonding strength between the lid body 1130 and the surface layer 1114C in the bonding region 1140 , the inner layer of each layer other than the surface layer 1114C of the laminated body 1114 and the laminated body 1131 . The cohesive strength and the interlayer bonding strength between the layers of the laminated body 1114 and the laminated body 1131 were weak. Therefore, when the user peels off the cover body 1130 , the surface layer 1114C pulled toward the cover body 1130 at the position corresponding to the joint region 1140 is cohesively damaged. Thereby, a part of the surface layer 1114C is peeled off together with the lid body 1130, and the remaining part of the surface layer 1114C remains on the subsurface layer 1114B side.

And when the user peels off the cover 1130 , as shown in FIG. 2(B) , the cohesive failure of the surface layer 1114C is interrupted at the resin reservoir 1120 , and only the cover 1130 is peeled off from then on. This is because, in the resin reservoir 1120 , the cohesive failure of the surface layer 1114C proceeds along the shape of the first resin reservoir 1121 . In the vicinity of the edge 1140E of the joint region 1140 where the surface of the first resin storage part 1121 and the surface of the second resin storage part 1122 are separated from each other, the surface layer 1114C is pulled from both sides to be disconnected and separated from the lid body 1130 side.

The container 1100 according to the present embodiment is unsealed by the above-mentioned steps. If the cohesive strength of the surface layer 1114C of the laminated body 1114 is weakened, the force of the user to peel off the lid body 1130 at the time of unpacking may be small, and the unpacking becomes easy. On the other hand, before unsealing, in a state in which the container body 1110 and the lid body 1130 are joined to each other, the internal pressure of the internal space SP acts on the joining region 1140 . The bonding strength between the lid body 1130 and the container body 1110 in the bonding region 1140 can be stronger than the cohesive strength of the surface layer 1114C, so even in the case where the unsealing is made easy by weakening the cohesive strength of the surface layer 1114C as described above , the bonding strength between the lid body 1130 and the container body 1110 can be in a strong state to resist a relatively high internal pressure. In addition, in the joint region 1140 , the stress is concentrated in the vicinity of the root on the concave portion 1111 side of the first resin reservoir 1121 , so that the joint region 1140 can withstand a higher internal pressure than the case where the resin reservoir is not formed. In this way, in the container 1100 according to the present embodiment, both the unsealing property and the internal pressure resistance can be achieved.

(Structure of the steam passage part)

In the present embodiment, as shown in FIG. 1 , a vapor passage portion 1141 is formed in the joint region 1140 of the container 1100 . Here, the vapor passage part 1141 is a part that can communicate the internal space SP and the external space when the internal pressure of the internal space SP of the container 1100 increases. More specifically, the vapor passage portion 1141 includes an unbonded region where the lid body 1130 and the container body 1110 are not bonded, or a weakly bonded region where the lid body 1130 and the container body 1110 are bonded with a relatively weak bonding strength per unit area. Specifically, as will be described later, the weak bonding region may be a region in which the bonding area within the region is the same as that of the other regions and the bonding strength is weaker than that of the other regions. In addition, the weak bonding region may be a region having the same bonding strength as other regions and a smaller bonding area within the region than the other regions. Alternatively, the weakly bonded region may be a region in which the bonding area within the region is smaller than that of the other regions and the bonding strength is weaker than that of the other regions. In the example shown in the figure, the vapor passage portion 1141 is formed in the vicinity of the center of each of the long sides of the substantially rectangular bonding region 1140 . In addition, the specific example of the arrangement|positioning of the unbonded area|region in the vapor|steam passage part 1141 or the weakly-bonded area|region will be mentioned later.

By forming the steam passage portion 1141 as described above, when the container 1100 is placed in a microwave oven to heat the contents such as food, a part of the water vapor generated from the heated contents is released through the steam passage portion 1141 . For example, in the vapor passage portion 1141, an unbonded region that traverses the bonding region 1140 in the width direction is formed, and the internal space SP communicates with the external space. In addition, for example, the vapor passage portion 1141 is formed with a weakly bonded region that traverses the bonded region 1140 in the width direction, the unbonded region or the weakly bonded region is arranged so as to form a concentrated portion of the internal pressure, and the lid body 1130 and the container body 1110 The joint therebetween is broken by the internal pressure of the internal space SP rising due to the generation of water vapor, whereby the internal space SP communicates with the external space.

Here, the steam passage part 1141 can be said to have the same function as the hole provided in the conventional container for discharging the steam in terms of the function of discharging the steam. However, in the container 1100 according to the present embodiment, with the above-described structure, the bonding strength between the container main body 1110 and the lid body 1130 can be enhanced without impairing the openability, and high internal pressure can be resisted. Therefore, in the present embodiment, the size and number of the unbonded regions or the weakly bonded regions arranged in the steam passage portion 1141 can be made smaller or larger than in the case of performing the same discharge of steam in, for example, a conventional container. few.

As already mentioned, the heating in the microwave oven varies greatly depending on the model and individual, but the container 1100 has high internal pressure resistance as described above, so even if the unbonded portion arranged in the steam passage portion 1141 is not left unbonded Even if the area or the weak joint area is larger than necessary, or there are many, rupture of the container 1100 can be reliably prevented. In this way, the size and number of the steam passages 1141 are made to the minimum required, and more steam is filled in the container during heating, so that the heating efficiency can be improved. Moreover, by making the internal pressure of the container 1100 high, it becomes possible to carry out pressure conditioning of the content similarly to a pressure cooker.

3A and 3B show an example in which the vapor passage portion 1141 includes three slit-shaped unbonded regions 1141A or weakly bonded regions 1141B that traverse the bonding region 1140 in the width direction. On the other hand, FIG. 4A and FIG. 4B show an example in which the vapor passage portion 1141 includes two slit-shaped unbonded regions 1141A or weakly bonded regions 1141B that traverse the bonding region 1140 obliquely. As shown in these examples, one or a plurality of slit-shaped unbonded regions 1141A and weakly bonded regions 1141B that traverse the bonding region 1140 in the width direction (may be inclined) can be arranged in the vapor passage portion 1141 .

5A and 5B show an example in which the weak bonding region 1141B is formed in the region including the front end of the portion where the bonding region 1140 protrudes in the width direction in the vapor passage portion 1141 . More specifically, in the example shown in FIG. 5A , the weak bonding region 1141B formed in the vapor passage portion 1141 is formed at the tip including the portion where the bonding region 1140 protrudes in a V shape from the inner space SP side toward the outer space. area within. On the other hand, in the example shown in FIG. 5B , the weak bonding region 1141B is formed in the region including the tip of the portion where the bonding region 1140 protrudes in a V shape from the outer space toward the inner space SP side. By setting it as a V shape as shown in FIG. 5A or 5B, the internal pressure resistance required for breaking the bonding can be controlled. Thereby, the breakage of the joint between the lid body 1130 and the container body 1110 in the weak joint region 1141B and the subsequent release of the water vapor to the external space via the vapor passage portion 1141 are generated stably. In addition, even in the case where the unbonded region 1141A is formed instead of the weakly bonded region 1141B in the above-described example, the release of water vapor to the external space via the vapor passage portion 1141 is stably generated by the same principle. In addition, in the illustrated example, the weak bonding region 1141B is formed only in the vicinity of the tip of the portion where the bonding region 1140 protrudes, but the weak bonding region 1141B may be formed over the entire portion where the bonding region 1140 protrudes. The same applies to the case where the unbonded region 1141A is formed.

6A and 6B show an example in which the weak bonding region 1141B is formed in the region including the top portion of the portion where the bonding region 1140 bulges in the width direction in the vapor passage portion 1141 . More specifically, in the example shown in FIG. 6A , the weak joint region 1141B formed in the vapor passage portion 1141 is formed in the portion including the joint region 1140 that bulges out in an arc shape from the inner space SP side toward the outer space. area inside the top. On the other hand, in the example shown in FIG. 6B , the weak bonding region 1141B is formed in the region including the top of the portion of the bonding region 1140 that bulges out in an arc shape from the outer space toward the inner space SP side. By setting it as a circular arc shape like FIG. 6A or 6B, it becomes possible to control the internal pressure resistance required for broken bonding. Thereby, the breakage of the joint between the lid body 1130 and the container body 1110 in the weak joint region 1141B and the subsequent release of the water vapor to the external space via the vapor passage portion 1141 are generated stably. In addition, even in the case where the unbonded region 1141A is formed instead of the weakly bonded region 1141B in the above-described example, the release of water vapor to the external space via the vapor passage portion 1141 is stably generated by the same principle. In addition, in the example shown in the figure, the weak bonding region 1141B is formed only in the vicinity of the top of the portion where the bonding region 1140 swells, but the weak bonding region 1141B may be formed in the entire portion where the bonding region 1140 swells. The same applies to the case where the unbonded region 1141A is formed.

In this way, in the present embodiment, the weakly bonded region 1141B or the unbonded region 1141A is formed in the vapor passage portion 1141 in the region including the front end or top of the portion where the bonded region 1140 protrudes or swells in the width direction. The concentrated portion of the internal pressure can stably generate breakage of the joint between the lid body 1130 and the container body 1110 and release of water vapor through the vapor passage portion 1141 when the internal pressure of the internal space SP rises. It should be noted that the breakage of the bond between the lid body 1130 and the container body 1110 generated at this time is caused by peeling off at the interface between the surface layer 1114C of the container body 1110 and the sealing layer 1131B of the lid body 1130, or by being formed on the surface layer 1114C It occurs due to cohesive peeling of the bonding layer with the sealing layer 1131B. In other words, the breakdown of the bond in the weak bond region 1141B of the above-described example is different from the interlayer peeling between the surface layer 1114C of the container body 1110 and the base material layer 1114A.

7A and 7B show an example in which the vapor passage portion 1141 includes an unbonded region 1141A and a weakly bonded region 1141B that are arranged in parallel with each other in the width direction of the bonding region 1140 . In these examples, after the joint between the lid body 1130 and the container body 1110 in the weak joint region 1141B is broken by the internal pressure of the internal space SP that rises upon heating of the contents, the water vapor is released via the unjoined region 1141A . In the example shown in FIG. 7A , the weakly bonded region 1141B is arranged on the side of the inner space SP, and the unbonded region 1141A is arranged on the side of the outer space. The unbonded region 1141A has a slit shape and forms a smaller communication route than the weakly bonded region 1141B. In the example of FIG. 7A , the weakly bonded region 1141B faces the internal space SP widely, so that the bonding of the weakly bonded region 1141B is easily broken when the internal pressure rises. On the other hand, by restricting the slit-shaped unbonded region The flow rate of water vapor released by 1141A improves the heating efficiency of the contents. In addition, the weak joint region 1141B may be formed only in the vapor passage portion 1141 , or may be formed on the inner space SP side of the joint region 1140 over the entire circumference of the flange portion 1112 other than the vapor passage portion 1141 . In addition, in the illustrated example, the bonding region 1140 and the weak bonding region 1141B are separated in the width direction of the bonding region 1140 , but the bonding region 1140 and the weak bonding region 1141B may be in close contact with each other in the width direction of the bonding region 1140 .

On the other hand, in the example shown in FIG. 7B , the unbonded region 1141A is arranged on the inner space SP side, and the weakly bonded region 1141B is arranged on the outer space side. In this example, the unbonded region 1141A also has a slit shape, and forms a smaller communication route than the weakly bonded region 1141B. In the example of FIG. 7B , the slit-shaped unbonded region 1141A functions as a throttle portion, whereby the internal pressure applied to the weakly bonded region 1141B is depressurized, so that the bonding up to the weakly bonded region 1141B can be broken. The internal pressure of the internal space SP is further increased in the period up to this point. If the arrangement of the steam passage portion 1141 and the internal pressure resistance performance of the container 1100 are appropriately combined, the heating efficiency of the contents can be further improved. In this case, the weak joint region 1141B may be formed only in the vapor passage portion 1141 , or may be formed on the outer space side of the joint region 1140 over the entire circumference of the flange portion 1112 other than the vapor passage portion 1141 . In addition, in the illustrated example, the bonding region 1140 and the weak bonding region 1141B are separated in the width direction of the bonding region 1140 , but the bonding region 1140 and the weak bonding region 1141B may be in close contact with each other in the width direction of the bonding region 1140 .

FIG. 8 is a view showing another example of a weakly joined region formed in the container shown in FIG. 1 . The weak bonding area 1141B in the above-mentioned example is a region in which the bonding area is the same as that of the other regions and the bonding strength is weaker than that of the other regions. However, as shown in FIGS. 8A to 8C , the bonding area within the region is smaller than that of the other bonding regions 1140 . The region can also function as the weak bonding region 1141B. FIG. 8A shows an example in which the bonding region 1140 is formed in a mesh shape in the weak bonding region 1141B. In this case, there is no joint between the part of the lid body 1130 and the container main body 1110 between the meshes, so the joint area is relatively small compared to other parts. An example in which the bonding region 1140 is formed with a narrow width in the weak bonding region 1141B is shown in FIG. 8B . Also in this case, the bonding area of the narrow-width portion is relatively small compared to other portions. FIG. 8C shows an example in which the bonding region 1140 is formed in the shape of a dot in the weak bonding region 1141B. The dots overlap each other and block the space between the inner space SP and the outer space as a whole. In this case, there is also no engagement between the lid body 1130 and the container body 1110 in the portion between the dots, so the engagement area is relatively small compared to other portions.

In addition, in the example described above, the unbonded region 1141A and the weakly bonded region 1141B were basically described as interchangeable structures, but there are also independent advantages. For example, in the case of the unjoined region 1141A, the size of the open portion between the container body 1110 and the lid body 1130 is determined in the steam passage portion 1141 , so that the steam passage portion 1141 can be released between the plurality of containers 1100 . The change in the flow rate of the water vapor is small. In this regard, in the weak joint region 1141B, the breakage of the joint between the container body 1110 and the lid body 1130 may spread beyond the boundary between the weak joint region 1141B and other parts of the joint region 1140 , or not reach the boundary. Among the plurality of containers 1100 , the flow rate of the water vapor that can be released from the vapor passage portion 1141 fluctuates greatly.

On the other hand, in the case of the weak bonding region 1141B, the container body 1110 and the lid body 1130 are sealed until the internal pressure of the inner space SP rises, so that the container 1100 can be connected to the steam passage portion 1141 without forming the container 1100 in the stage before heating. The sealed container is handled in the same way. In this regard, in the unbonded region 1141A, there is no bonding between the container body 1110 and the lid body 1130 at the stage of manufacturing the container 1100 , so a process different from that of a sealed container in which the vapor passage portion 1141 is not formed may be required. However, for example, when the container 1100 is wrapped with an outer film, or the content is only solid, the container 1100 in which the unbonded region 1141A is formed can be handled in the same manner as the airtight container.

(Manufacturing method of container)

It is a figure for demonstrating the manufacturing method of the container which concerns on 1st Embodiment of this invention. As shown in FIG. 9 , the manufacturing process of the container 1100 according to the present embodiment includes a process of joining the lid body 1130 and the container body 1110 by heat sealing using the annular sealing disk 1601 . Here, the annular sealing disc 1601 includes a bulging portion 1602 facing the inner peripheral side of the joint region 1140 formed in the flange portion 1112 of the container body 1110 , that is, the edge portion on the side of the recessed portion 1111 , and a bulging portion 1602 facing the edge portion on the side of the recessed portion 1111 . The inclined surface 1603 extended outside. It should be noted that, in order to join the outer peripheral side of the joining region 1140 , an additional flat surface 1604 including a substantially parallel flange portion 1112 may be arranged in addition to the annular sealing disc 1601 including the bulging portion 1602 and the inclined surface 1603 . The annular sealing disc 1605.

In the above-described manufacturing process, when the annular sealing disc 1601 is gradually lowered from the upper side in the figure, the bulging portion 1602 comes into contact with the lid body 1130 earlier than other parts. After that, the inclined surfaces 1603 come into contact with the cover body 1130 in sequence. Heat is applied from the annular sealing disc 1601 to the resin forming the lid 1130 and the container body 1110 at the portion where the bulging portion 1602 and the inclined surface 1603 abut, and the lid 1130 and the container body 1110 are joined by heat sealing. At this time, at the edge portion on the inner peripheral side of the bonding region 1140, the resin bulging portion forming the lower surface layer 1114B of the container body 1110, the surface layer 1114C, and the sealing layer 1131B of the lid body 1130 melted by the applied heat 1602 is extruded toward the concave portion 1111 side to form the first resin storage portion 1121 and the second resin storage portion 1122.

Here, by adjusting the size of the bulging portion 1602 of the annular sealing disc 1601, the sizes of the first resin storage portion 1121 and the second resin storage portion 1122 to be formed can be changed. For example, if the bulging portion 1602 of the annular sealing disc 1601 is made smaller in a part of the joint region 1140 than other parts, the first resin storage part 1121 and the second resin storage part 1122 in this part are made smaller than the other parts. It should be noted that if the annular sealing disc 1601 is not formed with the bulging portion 1602 in a part of the joint region 1140, and the entirety from the inner peripheral side to the outer peripheral side of the joint region 1140 is made a flat surface, this portion will not be The first resin storage portion 1121 and the second resin storage portion 1122 are formed.

It should be noted that, if the first resin storage portion 1121 and the second resin storage portion 1122 formed in a part of the joint region 1140 are smaller than other parts, the gap between the container main body 1110 and the lid body 1130 that can withstand the The size of the internal pressure of the joint is smaller than that of the other parts. Therefore, by adjusting the size of the bulging portion 1602 of the annular sealing disc 1601 as described above, the sizes of the first resin storage portion 1121 and the second resin storage portion 1122 can be changed, whereby the vapor passage portion 1141 can also be formed as a Weakly junctional regions that function.

In the manufacturing process of the container 1100 as described above, the unbonded region 1141A included in the vapor passage portion 1141 is formed by, for example, partially cutting out the bulging portion 1602 , the inclined surface 1603 and the flat surface 1604 of the annular sealing discs 1601 and 1605 . . Alternatively, the unbonded region 1141A may be formed by locally blocking the heat applied to the lid body 1130 from the bulging portion 1602 , the inclined surface 1603 , and the flat surface 1604 with a heat insulating material or the like. On the other hand, the weak joint region 1141B included in the vapor passage portion 1141 is formed by, for example, providing local irregularities in the bulging portion 1602 , the inclined surface 1603 , and the flat surface 1604 . Alternatively, the weak bonding region 1141B may be formed by locally weakening the heat applied to the lid body 1130 from the bulging portion 1602 , the inclined surface 1603 , and the flat surface 1604 with a heat insulating material or the like. As another method, the weak bonding region 1141B may reduce the strength of the interlayer bonding between the outer layer 1131A of the cover body 1130 and the sealing layer 1131B, or partially prevent the interlayer bonding between the outer layer 1131A and the sealing layer 1131B. to form.

(Summary of the first embodiment)

In the container 1100 according to the first embodiment of the present invention as described above, the cohesive strength of the surface layer 1114C of the laminated body 1114 constituting the container body 1110 is higher than that between the lid body 1130 and the container body 1110 . The bonding strength, the cohesive strength of the layers other than the surface layer 1114C of the laminate 1114 and the laminate 1131, and the interlayer bonding strength between the layers of the laminate 1114 and the laminate 1131 are weak, and can be enhanced without impairing the openability The bonding strength between the container body 1110 and the lid body 1130 is resistant to an internal pressure higher than that of a conventional container. In other words, in the present embodiment, a structure is provided between the container body 1110 and the lid body 1130 to facilitate peeling of the lid body 1130 from the container body 1110 by external force and to resist the internal pressure of the interior space SP. In addition, by forming the first resin storage portion 1121 and the second resin storage portion 1122 at the edge portion on the concave portion 1111 side of the joint region 1140, the unsealing operation of the container 1100 can be stabilized and the internal pressure resistance can be improved. By forming the steam passage portion 1141 in such a container 1100 to prevent the rupture of the container 1100 by discharging the water vapor to the outside during heating of the contents, and by restricting the amount of water vapor released from the steam passage portion 1141, the water vapor is released. Filling the internal space SP and raising the internal pressure to a certain level can improve the heating efficiency of the content.

As in the present embodiment, the vapor passage portion 1141 including the unbonded region 1141A or the weakly bonded region 1141B is provided as a mechanism for discharging the water vapor generated in the inner space SP to the outside during heating of the contents, as described below. In this way, deformation prevention of the container 1100 is effective. When the internal pressure of the internal space SP rises due to the generation of water vapor, the flange portion 1112 caused by the bulge of the lid body 1130 and the stress applied to the inner peripheral edge of the joint region 1140 between the container body 1110 and the lid body 1130 is generated. the lift. Since the vapor passage portion 1141 of the present embodiment is formed between the container body 1110 and the lid body 1130, the reaction force against the resistance of the water vapor passing through the vapor passage portion 1141 is applied to the lifting of the lid body 1130 as described above. , the direction in which the stress in which the flange portion 1112 is lifted is different, specifically, the horizontal direction (when the container 1100 is kept horizontal). Therefore, in the present embodiment, in the container 1100 provided with the vapor passage portion 1141 , deformation at the time of increasing the internal pressure can be effectively suppressed.

(Second Embodiment)

10 is a perspective view of a container according to a second embodiment of the present invention. Fig. 11 is a partial cross-sectional view showing an unsealing operation of the container shown in Fig. 10 .

The container 1200 according to the present embodiment includes a container body 1210 and a lid body 1230 having the same shape as the container 1100 according to the first embodiment. Specifically, the container body 1210 includes a concave portion 1111 and a flange portion 1112 formed along the periphery of the concave portion 1111 . The flange portion 1112 extends and protrudes outward from the peripheral edge of the recessed portion 1111 . The lid body 1230 is joined to the container body 1210 at the joining region 1140 formed in the flange portion 1112 to form an inner space SP between the lid body 1230 and the concave portion 1111 . In the container 1200 , a vapor passage portion 1141 is also formed in the joint region 1140 . In addition, since the structure of the vapor|steam passage part 1141 is the same as that of the above-mentioned 1st Embodiment, repeated description is abbreviate|omitted.

As shown in FIG. 11 , the container body 1210 is composed of a laminate 1214 including a base material layer 1114A, a subsurface layer 1114B, and a surface layer 1214C. As a difference from the laminate 1114 of the first embodiment, the surface layer 1214C is formed of, for example, a resin including an olefin-based resin, a polystyrene-based resin, and a polyester, like the base material layer 1114A and the lower surface layer 1114B. At least any one of the group consisting of resins. On the other hand, the lid body 1230 is constituted by the laminated body 1231 including the outer layer 1131A and the sealing layer 1231B. As a point different from the laminate 1131 of the first embodiment, the sealing layer 1231B is formed of, for example, a styrene-grafted acrylic resin, an adhesive polyolefin resin, or the like.

Due to the structures of the laminated body 1214 and the laminated body 1231 as described above, in the present embodiment, the cohesive strength of the sealing layer 1231B is weaker than the joint strength between the lid body 1230 and the container body 1210 in the joint region 1140 and is lower than that of the laminated body 1214 And the cohesive strength of each layer other than the sealing layer 1231B of the laminated body 1231 is weak, and is weaker than the interlayer bonding strength between the layers of the laminated body 1214 and the laminated body 1231 . In other words, when the subsurface layer 1114B is the first layer, the surface layer 1214C is the second layer, the sealing layer 1231B is the third layer, and the outer layer 1131A is the fourth layer, the The cohesive strength of the three layers is higher than the bonding strength between the cover body 1230 and the container body 1210 , the cohesive strength of the first layer, the second layer and the fourth layer, and between the first layer and the second layer, the third layer The interlayer bonding strength with the fourth layer is weak.

Furthermore, in the present embodiment, as shown in FIG. 11 , a first resin storage portion 1221 and a second resin storage portion 1222 are formed at the edge portion of the joint region 1140 on the side of the recessed portion 1111 . The first resin storage portion 1221 is made of resin forming the lower surface layer 1114B and the surface layer 1214C of the container body 1210 , and has a tumor-like cross-section inclined toward the recessed portion 1111 . The second resin storage portion 1222 is made of resin forming the sealing layer 1231B of the lid body 1230 , and has a bulging cross-section located closer to the concave portion 1111 than the first resin storage portion 1221 . In the following description of the present embodiment, the first resin storage part 1221 and the second resin storage part 1222 are also collectively referred to as the resin storage part 1220 .

(Opening action of container)

Next, the unsealing operation of the container 1200 as described above will be described. In the container 1200, the user also grasps the end portion of the lid body 1230 which is largely extended and protruded from the peripheral edge of the flange portion 1112, and peels off the lid body 1230 from there, as shown in FIG. 11(A), thereby starting The unsealing of the container 1200 is the same as that of the first embodiment. However, in the present embodiment, as described above, the cohesive strength of the sealing layer 1231B is higher than the bonding strength between the lid body 1230 and the container body 1210, the cohesive strength of the layers other than the sealing layer 1231B, and the laminates 1214, The interlayer bonding strength between the layers of the laminate 1231 is weak. Therefore, when the user peels off the lid body 1230, the sealing layer 1231B joined to the container body 1210 at the position corresponding to the joining area 1140 is cohesively destroyed. Thereby, the lid body 1230 is peeled off with a part of the sealing layer 1231B remaining on the surface layer 1214C side of the container body 1110 .

When the user peels off the lid 1230, as shown in FIG. 11(B), the cohesive failure of the sealing layer 1231B in the resin reservoir 1220 is interrupted, and the entire sealing layer 1231B is peeled off together with the lid 1230 from then on. This is because the second resin storage portion 1222 is formed in the resin storage portion 1220 so as to intersect with the direction in which the cohesive failure of the sealing layer 1231B proceeds. In the vicinity of the end edge 1140E of the joint region 1140 where the surface of the first resin reservoir 1221 and the surface of the second resin reservoir 1222 are separated from each other, the sealing layer 1231B is pulled from both sides to be disconnected and separated from the container body 1210 side .

The container 1200 according to the present embodiment is unsealed by the above-mentioned steps. If the cohesive strength of the sealing layer 1231B of the laminated body 1231 is weakened, the force of the user to peel off the lid body 1230 at the time of unpacking may be small, and the unpacking becomes easy. On the other hand, before unsealing, in a state in which the container body 1210 and the lid body 1230 are joined to each other, the internal pressure of the internal space SP acts on the joining region 1140 . The bonding strength between the lid body 1230 and the container body 1210 in the bonding region 1140 can be stronger than the cohesive strength of the sealing layer 1231B, so even in the case where unsealing is made easy by weakening the cohesive strength of the sealing layer 1231B as described above , the bonding strength between the lid body 1230 and the container body 1210 can also be in a strong state to resist a relatively high internal pressure. Therefore, in the joint region 1140 , the stress is concentrated in the vicinity of the root portion on the concave portion 1111 side of the first resin reservoir 1121 , so that the joint region 1140 can withstand a higher internal pressure than the case where the resin reservoir is not formed. In this way, in the container 1200 according to the present embodiment, both unsealing properties and internal pressure resistance can be achieved.

(Summary of the second embodiment)

In the container 1200 according to the second embodiment of the present invention as described above, the cohesive strength of the sealing layer 1231B of the laminated body 1231 constituting the lid body 1230 is higher than that between the lid body 1230 and the container body 1210 The bonding strength, the cohesive strength of the layers other than the sealing layer 1231B of the laminate 1214 and the laminate 1231, and the interlayer bonding strength between the layers of the laminate 1114 and the laminate 1231 are weak, and can be enhanced without impairing the openability The bonding strength between the container body 1210 and the lid body 1230 is resistant to an internal pressure higher than that of a conventional container. In addition, by forming the first resin storage portion 1121 and the second resin storage portion 1222 in the same manner as in the first embodiment, the unsealing operation of the container 1200 can be stabilized, and the internal pressure resistance can be improved. By forming the steam passage portion 1141 in such a container 1200 to prevent the rupture of the container 1200 by discharging the water vapor to the outside during heating of the contents, and by restricting the amount of water vapor released from the steam passage portion 1141, the water vapor is released. Filling the internal space SP and raising the internal pressure to a certain level can improve the heating efficiency of the content.

(third embodiment)

12 is a perspective view of a container according to a third embodiment of the present invention. Whereas the container bodies 1110 and 1210 in the above-described first and second embodiments have a substantially rectangular plan shape, the container body 1310 of the container 1300 according to this embodiment has a substantially circular plan shape. The container body 1310 includes a concave portion 1311 and a flange portion 1312 formed along the periphery of the concave portion 1311 and extending outward from the periphery of the concave portion 1311 . The lid body 1330 is a film-like member covering the opening of the concave portion 1311 , and forms an internal space SP between the cover body 1330 and the concave portion 1311 by being joined to the container body 1310 in the joint region 1340 formed in the flange portion 1312 .

Although not shown, the container body 1310 and the lid body 1330 are formed by the same combination of the laminated body 1114 and the laminated body 1131 as in the first embodiment, or the same combination of the laminated body 1214 and the laminated body 1231 as in the second embodiment. As a result, in the present embodiment, as in the first and second embodiments, the bonding strength between the container body 1310 and the lid body 1330 can be enhanced without impairing the openability, and it is possible to resist an internal pressure higher than that of the conventional container. . By forming the resin reservoir, the unsealing operation of the container 1300 can be stabilized and the internal pressure resistance can be improved, which is also the same as the first and second embodiments. In addition, in the present embodiment, the same steam passage portion 1341 as in the first and second embodiments is formed in the joint region 1340 of the container 1300, but the container 1300 has high internal pressure resistance, so the passage of steam from the container 1300 is restricted. The amount of the water vapor released from the part 1341 can be filled with the water vapor and the internal pressure can be increased to a certain extent. Therefore, also in this embodiment, while preventing the rupture of the container, the heating efficiency can be improved by utilizing the water vapor generated from the heated contents.

(Fourth Embodiment)

13 is a plan view of a container according to a fourth embodiment of the present invention. 14 is a partial cross-sectional view of the container shown in FIG. 13 , FIG. 14A is a cross-sectional view taken along line A-A shown in FIG. 13 , and FIG. 14B is a cross-sectional view taken along line B-B shown in FIG. 13 .

The container 1400 according to the present embodiment has the same structure as the container 1300 according to the third embodiment described above except for the parts described below. In the container 1400, instead of the vapor passage portion shown in the first to third embodiments, a weak bond region 1441B formed of no resin reservoir is formed, and the weak bond region 1441B functions as the vapor passage portion 1441. As shown in FIG. 14A , the resin storage portion 1120 is formed on the edge portion of the joint region 1340 on the concave portion 1311 side in addition to the vapor passage portion 1441, so that the joint between the container body 1310 and the lid body 1330 can resist high Internal pressure. On the other hand, as shown in FIG. 14B , in the weak joint region 1441B, the resin reservoir 1120 is not formed in the edge portion of the joint region 1340 on the concave portion 1311 side. Therefore, in the weak joint region 1441B, the joint between the container body 1310 and the lid body 1330 is broken by a lower internal pressure than the portion where the resin reservoir 1120 is formed. Specifically, interface peeling between the surface layer 1114C of the container body 1310 and the sealing layer 1131B of the lid 1330 or cohesive peeling of the bonding layer formed between the surface layer 1114C and the sealing layer 1131B of the lid 1330 occurs.

Also in the fourth embodiment of the present invention, the same effects as those of the first and second embodiments described above are obtained by forming the vapor passage portion 1441 . In addition, it is also possible to employ the weak bonding region formed by the resin reservoir not formed in the present embodiment in the vapor passage portion 1141 of the first and second embodiments described above.

(Fifth Embodiment)

15 is a perspective view of a container according to a fifth embodiment of the present invention. Fig. 15(A) shows a state before unsealing, and Fig. 15(B) shows a state during unsealing. FIG. 16 is a partial cross-sectional view of the container shown in FIG. 15 . FIGS. 16(A) and 16(B) correspond to the states of FIGS. 15(A) and 15(B) , respectively.

The container 2100 according to the present embodiment includes a container body 2110 (first container body) and a lid body 2130 (second container body). The container main body 2110 has a substantially rectangular planar shape, and includes a recessed portion 2111 and a flange portion 2112 formed along the periphery of the recessed portion 2111 . The flange portion 2112 extends and protrudes outward from the peripheral edge of the recessed portion 2111 . The lid body 2130 is a film-like member covering the opening of the concave portion 2111 , and is joined to the container body 2110 by heat sealing or ultrasonic sealing in the joining region 2140 formed in the flange portion 2112 , thereby connecting to the concave portion 2111 . An inner space SP is formed therebetween.

As shown in FIG. 16 , the container body 2110 is formed into a shape including a recess 2111 and a flange portion 2112 by vacuum forming, air pressure forming, or the like of a laminate 2114 including a base layer 2114A and a surface layer 2114B. The base material layer 2114A is located on the outer side of the container body 2110 and exhibits rigidity required for maintaining the shape of the container body 2110 . The surface layer 2114B is located on the inner side of the container body 2110, that is, on the side facing the inner space SP. In the bonding region 2140 , the lid body 2130 is bonded to the surface layer 2114B of the laminated body 2114 . As will be described later, the bonding strength between the lid body 2130 and the surface layer 2114B in the bonding region 2140 is stronger than the interlayer bonding strength between the base material layer 2114A and the surface layer 2114B of the laminate 2114 .

Here, the base material layer 2114A of the laminated body 2114 is configured in the same manner as the base material layer 1114A and the subsurface layer 1114B of the laminated body 1114 of the first embodiment described above. On the other hand, the surface layer 2114B of the laminated body 2114 is formed of, for example, a polyolefin-based resin. Examples of the polyolefin-based resin include homopolypropylene (HPP), reinforced polypropylene (RPP), and polypropylene-based resins such as block polypropylene, high-density polyethylene (HDPE), and low-density polyethylene (LDPE). Such polyethylene-based resins, linear ethylene-α-olefin copolymers, and the like. In the illustrated example, the laminate 2114 includes two layers, the base layer 2114A and the surface layer 2114B, but may include additional layers similarly to the laminate 1114 of the first embodiment described above.

In addition, in the present embodiment, the flange portion 2112 of the container body 2110 is formed with a cutout 2115 along the joint region 2140 . The notch 2115 is formed in at least the surface layer 2114B of the laminated body 2114 in the flange portion 2112 on the side of the concave portion 2111 from the bonding region 2140 . The cutout 2115 is an example of a defect portion of the surface layer 2114B, as will be described later. In the illustrated example, the cutout 2115 just penetrates the surface layer 2114B and does not reach the base material layer 2114A, but the cutout 2115 may reach a part of the base material layer 2114A. Alternatively, the cutout 2115 may not penetrate the surface layer 2114B, and the surface layer 2114B may be left with a thickness that can be easily broken when the container 2100 is unsealed. It should be noted that the cross-sectional shape of the cutout 2115 is a V-shape in the illustrated example, but may be other shapes such as a U-shape or an I-shape.

The lid body 2130 is composed of a film-like laminate 2131 including an outer layer 2131A and a sealing layer 2131B. The outer layer 2131A is located on the front side of the cover body 2130 , that is, the side not facing the container body 2110 , and exhibits flexibility and tensile strength required by the cover body 2130 . The sealing layer 2131B is located on the back side of the lid body 2130 , that is, on the side facing the container body 2110 , and is joined to the surface layer 2114B of the laminate 2114 constituting the container body 2110 in the joining region 2140 . Here, the outer layer 2131A and the sealing layer 2131B of the laminated body 2131 are configured in the same manner as the outer layer 1131A and the sealing layer 1131B of the laminated body 1131 of the first embodiment described above. In addition, in other embodiment, an additional layer may be included in the laminated body 2131.

In addition, in another example, the laminated body 2131 constituting the lid body 2130 does not necessarily have to be in the form of a film, and may be a sheet-like laminated body molded into a predetermined shape similarly to the laminated body 2114 constituting the container body 2110 . In this case, the container 2100 can be said to include a first container body and a second container body that are interchangeable. The laminate constituting the first container body includes the first layer and the second layer, and the second layer has a defect portion, whereby the container 2100 can be unsealed by interlayer peeling between the first layer and the second layer. In the above example, the first container body is the container body 2110 and the second container body is the lid body 2130. However, the first container body may be the lid body 2130, the second container body may be the container body 2110, and the second container body may be the container body 2110. The second layer of the laminate constituting the lid body 2130 forms a defect portion. The same structure can also be implemented in other embodiment mentioned later.

(Opening action of container)

Next, the unsealing operation of the container 2100 as described above will be described. In the container 2100, as shown in FIG. 16(A) , the lid body 2130 extends to a large extent from the peripheral edge of the flange portion 2112 of the container body 2110 at the corners of the substantially rectangular planar shape, for example. The user can easily grasp the end of the protruding lid body 2130 and peel off the lid body 2130 from there, thereby starting the unsealing of the container 2100 .

Here, as described above, the bonding strength between the lid body 2130 and the surface layer 2114B in the bonding region 2140 is stronger than the interlayer bonding strength between the base material layer 2114A and the surface layer 2114B of the laminate 2114 . Therefore, when the user peels off the cover body 2130 as described above, the surface layer 2114B joined with the cover body 2130 in the bonding region 2140 near the end of the laminated body 2114 is peeled off together with the cover body 2130, on the other hand, the laminated body 2114 The base material layer 2114A and the surface layer 2114B of the body 2114 are interlayered.

And when the user peels off the cover 2130, as shown in (B) of FIG. 16, the surface layer 2114B is separated from the cover 2130 at the cut 2115, and only the cover 2130 is peeled from then on. This is because, as described above, the cutouts 2115 are formed to penetrate the surface layer 2114B, or the cutouts 2115 are formed so that the surface layer 2114B can be easily broken through the cutouts 2115 .

The container 2100 according to the present embodiment is unsealed by the above-mentioned steps. If the interlayer bonding strength between the base material layer 2114A and the surface layer 2114B of the laminate 2114 is weakened, the user's force to peel off the lid 2130 during unpacking may be small, and unpacking becomes easier. On the other hand, before unsealing, in a state in which the container body 2110 and the lid body 2130 are joined to each other, the internal pressure of the internal space SP is concentrated on the joint region 2140 , more specifically, on the edge of the joint region 2140 on the concave portion 2111 side department. Since the cutout 2115 is separated from the edge portion of the joint region 2140, concentrated internal pressure is prevented from acting so that the laminate 2114 is delaminated from the cutout 2115. Therefore, even in the case where unsealing is facilitated by weakening the interlayer bonding strength as described above, it is possible to resist a high internal pressure by enhancing the bonding strength between the lid body 2130 and the surface layer 2114B. In this way, in the container 2100 according to the present embodiment, both unsealing properties and internal pressure resistance can be achieved.

(Structure of the steam passage part)

In the present embodiment, as shown in FIG. 15 , a vapor passage portion 2141 is formed in the joint region 2140 of the container 2100 . It should be noted that the general configuration and the functions and effects of the steam passage portion 2141 are the same as those of the steam passage portion 1141 of the first embodiment described above. Hereinafter, a specific example of the arrangement of the unbonded region or the weakly bonded region of the vapor passage portion 2141 of the present embodiment will be described.

In FIGS. 17A and 17B , the same example of the vapor passage portion 2141 as the example described above with reference to FIGS. 3A and 3B is shown. On the other hand, in FIGS. 18A and 18B , an example of the same vapor passage portion 2141 as the example described above with reference to FIGS. 4A and 4B is shown. In FIGS. 19A and 19B , an example of the vapor passage portion 2141 that is the same as the example described above with reference to FIGS. 5A and 5B is shown. 20A and 20B show an example of the vapor passage portion 2141 that is the same as the example described above with reference to FIGS. 6A and 6B . In addition, the same vapor passage portion 2141 as the example described above with reference to FIGS. 8A to 8C may be configured.

21A and 21B show an example in which the vapor passage portion 2141 includes an unbonded region 2141A and a weakly bonded region 2141B that are arranged in parallel with each other in the width direction of the bonding region 2140 . In these examples, after the joint between the lid body 2130 and the container body 2110 in the weak joint region 2141B is broken by the internal pressure of the internal space SP that rises upon heating of the contents, the water vapor is released via the unjoined region 2141A . In the example shown in FIG. 21A , the weakly bonded region 2141B is arranged on the side of the inner space SP, and the unbonded region 2141A is arranged on the side of the outer space. The unbonded region 2141A has a slit shape and forms a smaller communication route than the weakly bonded region 2141B. In the example of FIG. 21A , the weakly bonded region 2141B faces the internal space SP widely, and the bonding of the weakly bonded region 2141B is easily broken when the internal pressure rises. On the other hand, by restricting the slit-shaped unbonded region The flow rate of water vapor released by 2141A improves the heating efficiency of the contents. In addition, the weak joint region 2141B may be formed only in the vapor passage portion 2141, or may be formed on the inner space SP side of the joint region 2140 over the entire circumference of the flange portion 2112 other than the vapor passage portion 2141. In addition, in the illustrated example, the bonding region 2140 and the weak bonding region 2141B are in close contact with each other in the width direction of the bonding region 2140 , but the bonding region 2140 and the weak bonding region 2141B may be separated in the width direction of the bonding region 2140 .

On the other hand, in the example shown in FIG. 21B , the unbonded region 2141A is arranged on the inner space SP side, and the weakly bonded region 2141B is arranged on the outer space side. Also in this example, the unbonded region 2141A has a slit shape, and forms a smaller communication route than the weakly bonded region 2141B. In the example of FIG. 21B , the slit-shaped unjoined region 2141A functions as a throttle portion, whereby the internal pressure applied to the weakly joined region 2141B is depressurized, so that the joint up to the weakly joined region 2141B can be broken. The internal pressure of the internal space SP is further increased in the period up to this point. If the arrangement of the vapor passage portion 2141 and the internal pressure resistance performance of the container 2100 are appropriately combined, the heating efficiency of the contents can be further improved. In this case, the weak joint region 2141B may be formed only in the vapor passage portion 2141 , or may be formed on the outer space side of the joint region 2140 over the entire circumference of the flange portion 2112 other than the vapor passage portion 2141 . In addition, in the illustrated example, the bonding region 2140 and the weak bonding region 2141B are in close contact with each other in the width direction of the bonding region 2140 , but the bonding region 2140 and the weak bonding region 2141B may be separated in the width direction of the bonding region 2140 .

(Summary of Fifth Embodiment)

In the container 2100 according to the fifth embodiment of the present invention as described above, the bonding region 2140 has a bonding strength stronger than the interlayer bonding strength between the base material layer 2114A and the surface layer 2114B constituting the laminate 2114 Bonding Strength The lid body 2130 and the surface layer 2114B are bonded together, and the notches 2115 are formed along the inner periphery of the bonding region 2140, whereby the bonding strength between the container body 2110 and the lid body 2130 can be enhanced without impairing the unsealing property, and resistance to Higher internal pressure than conventional containers. In other words, in the present embodiment, a structure is provided between the container body 2110 and the lid body 2130 to facilitate peeling of the lid body 2130 from the container body 2110 by external force and to resist the internal pressure of the interior space SP. By forming the steam passage portion 2141 in such a container 2100 and discharging the water vapor to the outside during heating of the contents, the rupture of the container 2100 is prevented, and the amount of the water vapor released from the steam passage portion 2141 is restricted to allow the water vapor Filling the internal space SP and raising the internal pressure to a certain level can improve the heating efficiency of the content. In addition, with regard to the prevention of deformation of the container 2100, the same effects as those of the above-described first embodiment can be obtained.

(Sixth Embodiment)

22 is a perspective view of a container according to a sixth embodiment of the present invention. FIG. 22(A) shows a state before unsealing, and FIG. 22(B) shows a state during unsealing. FIG. 23 is a partial cross-sectional view of the container shown in FIG. 22 . 23A is a cross-sectional view taken along line A-A shown in FIG. 22(A) , and FIG. 23B is a cross-sectional view taken along line B-B shown in FIG. 22(A) . 23C is a cross-sectional view taken along line B-B of the container according to the modification.

The container 2200 according to this embodiment includes a container body 2210 and a lid body 2230 . The container main body 2210 has a substantially circular planar shape, and includes a concave portion 2211 and a flange portion 2212 formed along the periphery of the concave portion 2211 . The flange portion 2212 extends and protrudes outward from the peripheral edge of the recessed portion 2211 . The lid body 2230 is a film-like member covering the opening of the concave portion 2211, and is formed between the lid body 2211 and the concave portion 2211 by being joined to the container body 2210 by heat sealing or ultrasonic sealing in the joint region 2240 formed in the flange portion 2212. Internal space SP. Also in the container 2200, a vapor passage portion 2141 is formed in the joint region 2240. In addition, since the structure of the vapor|steam passage part 2141 is the same as that of the above-mentioned 5th Embodiment, repeated description is abbreviate|omitted.

As shown in FIG. 23 , the container body 2210 is formed into a shape including a recess 2211 and a flange portion 2212 by vacuum forming, air pressure forming, or the like of the laminate 2114 similar to that of the fifth embodiment described above. The lid body 2230 is also constituted by the same film-like laminate 2131 as in the fifth embodiment described above. The lid body 2230 is bonded to the surface layer 2114B using heat sealing, ultrasonic sealing, or an adhesive in the bonding region 2240 . As in the fifth embodiment, the bonding strength between the lid body 2230 and the surface layer 2114B in the bonding region 2240 is stronger than the interlayer bonding strength between the base material layer 2114A and the surface layer 2114B in the laminate 2114 .

In addition, also in the present embodiment, similarly to the fifth embodiment, the flange portion 2212 of the container body 2210 is formed with a cutout 2215 along the joint region 2240 . The notch 2215 is formed in at least the surface layer 2114B of the laminated body 2114 in the flange portion 2212 on the side of the concave portion 2211 from the bonding region 2240 . As in the fifth embodiment, the depth and cross-sectional shape of the cutout 2215 are not limited to the illustrated example, and may be various.

Further, in the present embodiment, the container body 2210 includes the skirt portion 2216 formed on the peripheral edge of the flange portion 2212 , and the stepped portion 2217 formed on a part of the peripheral edge of the skirt portion 2216 . 22 and 23 , the flange portion 2212 extends and protrudes substantially horizontally from the periphery of the recessed portion 2211 , and the skirt portion 2216 further extends and protrudes obliquely downward from the periphery of the flange portion 2212 . The stepped portion 2217 is a portion that extends and protrudes in parallel with the flange portion 2212 , that is, substantially horizontally, at a position lower than the flange portion 2212 by a part of the peripheral edge of the skirt portion 2216 . An additional bonding region 2218 where the lid body 2230 and the surface layer 2114B of the laminated body 2114 are bonded is formed in the stepped portion 2217 . In addition, in the example shown in figure, although the joining area|region 2240 and the additional joining area|region 2218 are separated, they may be formed continuously.

In the present embodiment, by forming the skirt portion 2216, the rigidity of the outer ring portion of the container body 2210 constituted by the flange portion 2212 and the skirt portion 2216 is improved. Thereby, the container body 2210 can maintain its shape against loads and impacts, and, for example, when the internal space SP becomes negative pressure and the lid body 2230 is pulled toward the recessed portion 2111 side, the tension of the lid body 2230 can be suppressed. Warp of the flange portion 2212.

On the other hand, when the skirt portion 2216 is formed, as shown in FIG. 23A , the joint region 2240 formed on the flange portion 2212 is away from the end portion of the laminate 2114 located at the periphery of the skirt portion 2216, so that when the cover is peeled off When the container 2200 is unsealed with the body 2230 , it is difficult to delaminate between the base material layer 2114A and the surface layer 2114B in the bonding region 2240 . On the other hand, as shown in FIG. 23B , an additional bonding region 2218 close to the end of the laminate 2114 is formed in the portion where the stepped portion 2217 is formed, so that the base material layer 2114A can be easily added to the additional bonding region 2218. Interlayer peeling from the surface layer 2114B. Therefore, the container 2200 can also be easily unsealed by the operation described with reference to FIG. 16 in the above-mentioned fifth embodiment.

FIG. 23C shows a cross-sectional view of a container according to a modification of the present embodiment. In the container according to the modified example, an additional cutout 2215B is formed in place of the additional joining region 2218 formed in the stepped portion 2217 in the example shown in FIG. 23B . In addition, in the example shown to FIG. 23C, notch 2215A is formed similarly to the notch 2215 of the example of FIG. 23B etc.. FIG. The additional cutout 2215B is a defect portion of the surface layer 2114B formed at a position closer to the outer peripheral side of the flange portion 2212 than the cutout 2215A. The cutout 2215B is also formed with various depths and cross-sectional shapes similarly to the cutout 2215A. In addition, the additional notch 2215B can be formed in arbitrary positions in the vicinity of the outer peripheral edge of the bonding area|region 2240. Specifically, the additional cutout 2215B may be formed at a position substantially coincident with the outer peripheral edge of the joint region 2240 as in the example shown in the figure, or may be formed at a position separated from the outer peripheral edge of the joint region 2240 to the outer peripheral side of the flange portion 2212 The position may be formed at a position closer to the inner peripheral side of the flange portion 2212 than the outer peripheral edge of the joint region 2240 , that is, a position overlapping the joint region 2240 .

In the example of FIG. 23C , when the user peels off the lid 2230 to unseal the container 2200, the base layer 2114A and the surface layer 2114B can be easily peeled from each other starting from the cut 2215B. Thereafter, the container according to this modification can also be unsealed by the operation described with reference to FIG. 16 in the fifth embodiment described above.

(Summary of the sixth embodiment)

In the container 2200 according to the sixth embodiment of the present invention as described above, the bonding region 2240 has a bonding strength stronger than the interlayer bonding strength between the base material layer 2114A and the surface layer 2114B constituting the laminate 2114 The bonding strength joins the lid body 2230 and the surface layer 2114B and forms the cutout 2215 along the inner periphery of the bonding region 2240, thereby enhancing the bonding strength between the container body 2210 and the lid body 2230 without impairing the unsealing property, and resisting the Higher internal pressure than conventional containers. By forming the steam passage portion 2141 in such a container 2200 to prevent the rupture of the container 2200 by discharging the water vapor to the outside during heating of the contents, and by restricting the amount of water vapor released from the steam passage portion 2141, the water vapor is released. Filling the internal space SP and raising the internal pressure to a certain level can improve the heating efficiency of the content.

Moreover, in this embodiment, by forming the skirt part 2216, the rigidity of the edge part of the container main body 2210 can be improved. Furthermore, by forming the stepped portion 2217 together with the skirt portion 2216 and forming the additional joint region 2218 in the stepped portion 2217, even when the skirt portion 2216 is formed, the container body 2210 can be reinforced without impairing the openability as described above. Bonding strength with the cover body 2230.

In addition, in the case of the modification shown in FIG. 23C , by forming the additional cutout 2215B, the effect of the present embodiment described above can be obtained even if the additional bonding region 2218 is not provided. In addition, since the outer peripheral edge of the engaging region 2240 can be positioned on the outer peripheral side of the flange portion 2212 beyond the notch 2215B as described above, the outer peripheral edge of the engaging region 2240 allows a certain amount of alignment when the lid body 2230 and the container body 2210 are attached. degree of offset.

(Seventh Embodiment)

24 is a plan view of a container according to a seventh embodiment of the present invention. FIG. 25 is a partial cross-sectional view of the container shown in FIG. 24 . 25A is a cross-sectional view taken along line A-A shown in FIG. 24 , FIG. 25B is a cross-sectional view taken along line B-B shown in FIG. 24 , and FIG. 25C is a cross-sectional view taken along line C-C shown in FIG. 24 .

The container 2300 according to this embodiment includes a container body 2310 and a lid body 2230 . The container main body 2310 has a substantially circular planar shape similarly to the sixth embodiment, and includes a concave portion 2211 and a flange portion 2312 extending and protruding outward from the peripheral edge of the concave portion 2211 . The container body 2310 is different from the container body 2210 of the sixth embodiment in that the skirt portion 2216 and the stepped portion 2217 are not formed, but otherwise has the same configuration as the container body 2210 including the cutout 2215 . The lid body 2230 is configured similarly to the sixth embodiment, and is joined to the container body 2310 in the joining region 2340 formed in the flange portion 2312 . The joint area 2340 includes an annular portion 2341 and an outer protrusion 2342 . An unbonded region 2341A is formed in a part of the annular portion 2341 . In addition, the lid body 2230 is also joined to the container body 2310 in the annular weakly joined region 2341B formed in the flange portion 2312 . As will be described later, in this embodiment, when the internal pressure of the internal space SP rises, the vapor passage portion that communicates the internal space SP and the external space includes the unbonded regions 2341A arranged in parallel with each other in the width direction of the bonded region 2340 and weakly bonded region 2341B. Here, the unbonded region 2341A formed only in a part of the annular portion 2341 forms a communication path smaller than the weakly bonded region 2341B formed over the entire circumference of the flange portion 2312 .

As shown in FIG. 25A , the annular portion 2341 in the above-described joint region 2340 is formed with a relatively narrow width relative to the width of the flange portion 2312 . Thereby, in the annular portion 2341, the joint region 2340 is separated from the end portion of the laminated body 2114 located at the peripheral edge of the flange portion 2312, but on the other hand, the lid body is sealed by heat sealing, ultrasonic sealing, or an adhesive. The alignment of the 2230 in engagement with the container body 2310 allows for some offset.

On the other hand, as shown in FIG. 25B , the outer extending portion 2342 in the joint region 2340 extends outward from the annular portion 2341 , that is, toward the peripheral edge of the flange portion. The planar shape of the outer extension portion 2342 is not limited to the trapezoid as in the illustrated example, and may be other shapes such as a triangle, a semicircle, and a U shape. In addition, in the example shown in the figure, the outer overhang portion 2342 reaches the peripheral edge of the flange portion 2212, but as long as the interlayer peeling between the base layer 2114A and the surface layer 2114B of the laminated body 2114 can be started as described later It is sufficient to approach the peripheral edge of the flange portion 2312 within the range, and does not necessarily need to reach the peripheral edge of the flange portion 2312 .

In the present embodiment, by forming the outer extension portion 2342 close to the peripheral edge of the flange portion 2312, when the lid body 2230 is peeled off and the container 2300 is unsealed, the base material layer 2114A and the surface layer of the laminated body 2114 can be easily formed. Interlayer peeling between 2114B. In other words, in the present embodiment, by narrowing the width of the joint region 2340 in the annular portion 2341 other than the outer overhang portion 2342, the deviation of the alignment is allowed, and by forming the outer overhang portion 2342, it is maintained. Higher openability of the container 2300.

Furthermore, as shown in FIG. 25C , the unbonded region 2341A is a region where there is no bonding between the container main body 2310 and the lid body 2230 due to the interruption of the annular portion 2341 of the bonded region 2340 . However, since the annular weakly bonded region 2341B is also formed in the portion where the unbonded region 2341A is formed, the flange portion 2312 is located between the container body 2310 and the lid body 2230 in a state where the internal pressure of the internal space SP does not rise. Engage all week. Here, in the state where the container body 2310 and the lid body 2230 are joined to each other, the internal pressure of the internal space SP is concentrated on the edge portion on the concave portion 2211 side of the annular weakly joined region 2341B, so when the internal pressure of the internal space SP rises At this time, first, the joint between the container body 2310 and the lid body 2230 is broken in a certain part of the annular weak joint region 2341B. When the unbonded region 2341A and the weakly bonded region 2341B are separated in the width direction of the bonded region 2340 as in the example shown in the figure, the water vapor from the portion where the bonding of the weakly bonded region 2341B is broken passes through the ring portion 2341 and weakly bonded Between the regions 2341B, it reaches the unbonded region 2341A, and is discharged to the external space from the unbonded region 2341A. Alternatively, in the case where the unbonded region 2341A and the weakly bonded region 2341B are in close contact in the width direction of the bonded region 2340, the destruction of the bonding proceeds in the circumferential direction of the weakly bonded region 2341B, when in the portion adjacent to the unbonded region 2341A When the joint of the weak joint region 2341B is broken, the water vapor is discharged to the external space.

As already described, the breakage of the bond between the lid body 2230 and the container body 2310 in the weak bond region 2341B is caused by the interface peeling or formation between the surface layer 2114B of the container body 2310 and the sealing layer 2131B of the lid body 2230 The cohesive peeling of the bonding layer between the surface layer 2114B and the sealing layer 2131B is different from the interlayer peeling between the surface layer 2114B and the base layer 2114A. If the edge portion of the weakly bonded region 2341B is separated from the notch 2215 as in the example shown in the figure, the internal pressure does not act so as to cause interlayer peeling between the base layer 2114A and the surface layer 2114B. Therefore, in the unbonded region 2341A The outer inner space SP does not communicate with the outer space.

As a result, in the present embodiment, the joint between the lid body 2230 and the container body 2310 is partially broken in the weak joint region 2341B by the internal pressure of the inner space SP rising due to the generation of water vapor, and the lid body 2230 and the container body are broken. The unjoined portion of 2310 reaches the unjoined region 2341A, whereby the internal space SP communicates with the external space. In other words, in the present embodiment, the unbonded region 2341A of the annular portion 2341 formed in the bonding region 2340 and the annular weakly bonded region 2341B formed inside the annular portion 2341 are combined as the inner space SP When the pressure rises, the vapor passage portion that can communicate the internal space SP and the external space functions.

It should be noted that the configurations of the fifth embodiment to the seventh embodiment described above are interchangeable. For example, a skirt portion 2216 and a stepped portion 2217 like the sixth embodiment may be formed on the container body 2110 having a substantially rectangular planar shape like the fifth embodiment. Alternatively, the flange portion 2112 of the container body 2110 having a substantially rectangular planar shape may be formed with a joint region 2340 including an annular portion 2341 and an outer projection portion 2342, a non-joint region 2341A, and a weak joint region 2341B. Various modification examples described below can be similarly applied to the fifth embodiment to the seventh embodiment.

(Variation)

26 and 27 are diagrams showing a first modification of the embodiment of the present invention. As shown in FIG. 26(A) , in this modification, a base material layer covering the edge of the surface layer 2114B is formed at the edge of the laminate 2114 located at the peripheral edge of the flange portion 2112 of the container body 2110 . The sagging portion 2114P of the end edge of 2114A. As shown in FIG. 26(B) , when the container 2100 is unsealed, the surface layer 2114B is peeled off from the base material layer 2114A together with the sagging portion 2114P, and is peeled off together with the lid 2130 . Alternatively, the surface layer 2114B may be disconnected at the hanging portion 2114P, and the tip of the hanging portion 2114P may remain on the base layer 2114A side. As shown in FIG. 27 , in the manufacturing process of the container 2100, when the laminated body 2114 is punched at a position located at the peripheral edge of the flange portion 2112, the outside of the flange portion 2112 is sandwiched between the guides 2601A and 2601B. In this state, the laminated body 2114 can be formed by contacting the punching die 2602 from the back side of the flange portion 2112, that is, from the side where the base material layer 2114A of the laminated body 2114 is located, and punching the laminated body 2114. shape of the end.

For example, when the lid 2130 and the surface layer 2114B are joined by heat sealing in the joining region 2140 formed near the end of the laminate 2114, the molten It is possible for resin to flow out of the bonding area 2140 . At this time, if the outflowing resin reaches the end of the laminate 2114 and passes over the edge of the surface layer 2114B to reach the edge of the base layer 2114A, it becomes difficult to separate the base layer 2114A and the surface layer 2114B when the container 2100 is unsealed. Peel between layers. In the present modification, by forming the hanging portion 2114P in the surface layer 2114B as described above, it is possible to prevent the resin flowing out from reaching the edge of the base layer 2114A. Therefore, in this modification example, the lid body 2130 and the surface layer 2114B can be joined by, for example, heat sealing at high temperature and high pressure, thereby further improving the internal pressure resistance of the container 2100 .

FIG. 28 is a diagram showing a second modification of the embodiment of the present invention. As shown in FIG. 28 , in this modification, in place of the notch 2115 formed in the flange portion 2112 of the container body 2110 , the boundary between the flange portion 2112 and the recessed portion 2111 is located closer to the recessed portion 2111 than the joint region 2140 . A thin portion 2120 of the surface layer 2114B is formed nearby. For example, when the laminated body 2114 is formed into a shape including the concave portion 2111 and the flange portion 2112, the thin portion 2120 is formed by pressing the flange portion 2112 to cause the resin of the base material layer 2114A to bulge toward the surface layer 2114B side. . In the thin portion 2120, the surface layer 2114B may be formed to be locally thin as in the example shown in the figure, or the surface layer 2114B may be partially interrupted.

When the thin portion 2120 is formed in the surface layer 2114B as in the present modification, the surface layer 2114B is interrupted in the thin portion 2120 or has a thickness that can be easily broken. Therefore, when the container 2100 is unsealed When the surface layer 2114B is separated from the cover body 2130 at the thin portion 2120, only the cover body 2130 is peeled off from then on. In other words, the thin portion 2120 of the present modification has the same function as that of the notch 2115 of the fifth embodiment described above. In this specification, the part which interrupts the surface layer 2114B in this way, or has a thickness of such a degree that it can be easily broken is also referred to as a defect part of the surface layer 2114B. The shape of the missing portion may be any shape as long as it has the same function as the above-mentioned cutout 2115 and the thin portion 2120, and is not necessarily limited to the shape called a cutout or a thin portion.

(Eighth Embodiment)

的大致圆形的非接合区域3141A以中心间隔d排列。在此，排列是指以具有规则性的位置关系形成。各个非接合区域3141A不相互接触而独立(换句话说，

)。非接合区域3141A例如通过在密封盘形成相同形状的凹部且不在凹部中施加热、超声波而形成。通过形成非接合区域3141A，能够在蒸气通过部3141使接合强度比其他部分低、或者在蒸气通过部3141使接合强度相对于密封温度(或者超声波的强度)的变化率缓慢。FIG. 29 is an enlarged view showing a vapor passage portion of the container according to the eighth embodiment of the present invention. In this embodiment, the junction area 3140 between the container body (first container body) and the lid body (second container body) is, for example, the junction area 1140 of the first embodiment described above, or the junction area of the fifth embodiment. 2140 is constructed in the same way. As shown in the figure, in the vapor passage portion 3141 formed in the joint region 3140, in the joint region 3140, the diameter

The substantially circular non-bonding regions 3141A of are arranged at center intervals d. Here, an arrangement means formation in a regular positional relationship. The respective non-bonding regions 3141A are independent without contacting each other (in other words,

). The non-bonding region 3141A is formed by, for example, forming a concave portion of the same shape in the sealing disk without applying heat or ultrasonic waves to the concave portion. By forming the non-bonding region 3141A, the bonding strength of the vapor passage portion 3141 can be made lower than that of other portions, or the rate of change of the bonding strength with respect to the sealing temperature (or the intensity of ultrasonic waves) can be slowed in the vapor passage portion 3141 .

30 is an enlarged view showing a vapor passage portion of a container according to a modification of the eighth embodiment of the present invention. As shown in the figure, in the vapor passage portion 3141 of the container according to the modification, non-bonding regions 3141B with rounded corners are arranged in a V-shape. In the present modification, the non-bonding regions 3141B are not in contact with each other and are independent. The non-bonding region 3141B is also formed by, for example, forming a concave portion of the same shape in the sealing disk without applying heat or ultrasonic waves to the concave portion. In the case of forming the non-bonding region 3141B, the bonding strength of the vapor passage portion 3141 may be lower than that of other portions, or the rate of change of the bonding strength with respect to the sealing temperature (or the intensity of ultrasonic waves) may be slowed in the vapor passage portion 3141 .

As shown in the example of FIG. 30 described above, in the present embodiment, the vapor passage portion 3141 is not limited to a substantially circular shape, and various shapes of non-joining regions may be arranged. In addition to the shapes shown in the example of FIG. 30 , non-joining regions such as polygons or ellipses may be arranged. In addition, the shapes of the non-bonding regions do not need to be all the same. For example, the steam passage portion 3141 may be formed by arranging non-bonding regions of a plurality of shapes. In either case, the non-joining regions are independent without contacting each other, thereby preventing the occurrence of a seal leak in which the inside of the container communicates with the outside.

变化的例子，实施例4是将非接合区域设为圆角V形的例子，比较例1是没有形成非接合区域的例子。在表1中还示出每一个非接合区域的面积S。需要说明的是，实施例4的面积S忽略V形的圆角部分而(作为存在角的形状)计算。需要说明的是，对表1的蒸气通过稳定性的评价以A(良好)、B(稍微良好)、C(不合格)这3级来记载。Next, experimental results related to the present embodiment will be described. For Examples 1 to 4 and Comparative Example 1 shown in Table 1, the sealing temperature of heat sealing was changed, and the RPP (reinforced polypropylene) sealing film was bonded to the sheet before being formed into a container as a lid material. The resulting member was used to measure the breaking pressure (maximum pressure at the time of bag breaking) by feeding air between the sheet and the cover at a predetermined blowing amount. In Example 1 to Example 3, the non-joining area was circular and the diameter was

As a modified example, Example 4 is an example in which the non-bonding region is formed into a rounded V shape, and Comparative Example 1 is an example in which the non-bonding region is not formed. Also shown in Table 1 is the area S of each non-bonding region. In addition, the area S of Example 4 was calculated by ignoring the rounded portion of the V shape (as a shape with a corner). In addition, the evaluation of the vapor|steam passage stability of Table 1 is described in three grades of A (good), B (slightly good), and C (failure).

[Table 1]

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Non-Joint Area Shape round round round Rounded V shape none φ(mm) 0.60 0.46 1.0 - - S(mm²) 0.28 0.17 0.7g 0.64 - Vapor Pass Stability A B A A C

Table 1: Examples and Comparative Examples

的实施例1、实施例3以及实施例4中，密封温度超过165℃之后的破穿压强的上升与比较例1相比显著缓慢，破穿压强在密封温度为185℃～195℃时超过0.10MPa(在表1中，对于蒸气通过稳定性为“A”的评价)。这样，在实施例1～实施例4中相对于密封温度的蒸气通过稳定性与比较例1相比改善，因此能够使实现所希望的破穿压强的情况下的密封温度的允许误差较大。例如根据上述的实施例2的结果，为了蒸气通过稳定性的改善，每一个非接合区域的面积S优选为0.1mm²以上，更加优选为0.15mm²以上。FIG. 31 is a graph showing the relationship between the burst pressure and the sealing temperature in the examples and the comparative examples. As shown in the graph, in Comparative Example 1, the rupture pressure increased sharply from 0.034 MPa to 0.111 MPa at a sealing temperature of 165°C to 175°C. In other words, in the case of Comparative Example 1, when the sealing temperature was changed in the above-mentioned temperature range of 10° C., the bursting pressure greatly changed, so the vapor passage stability with respect to the sealing temperature was low. On the other hand, in the examples of the present invention, the inclination of the bursting pressure in the above-mentioned temperature range in Example 2 was slightly gentler than that in Comparative Example 1 (in Table 1, the evaluation of "B" for the vapor passage stability ). In further increasing the diameter of the non-joint area

In Example 1, Example 3 and Example 4, the rise of the rupture pressure after the sealing temperature exceeds 165°C is significantly slower than that of Comparative Example 1, and the rupture pressure exceeds 0.10 when the sealing temperature is 185°C to 195°C. MPa (in Table 1, evaluation of "A" for vapor passage stability). In this way, in Examples 1 to 4, the vapor passage stability with respect to the sealing temperature is improved compared with that in Comparative Example 1, and therefore, the allowable error of the sealing temperature can be made larger when the desired burst pressure is achieved. For example, according to the results of the above-mentioned Example 2, in order to improve the vapor passage stability, the area S of each non-bonding region is preferably 0.1 mm ² or more, and more preferably 0.15 mm ² or more.

As mentioned above, although suitable embodiment of this invention was described in detail with reference to drawings, this invention is not limited to these examples. It goes without saying that those skilled in the art in the technical field to which the present invention pertains can conceive of various modifications or corrections within the scope of the technical idea described in the technical claims, and these should be understood as It is included in the scope of the technology of the present invention.

Description of reference numbers:

1100...Container, 1110...Container body, 1111...Concave portion, 1112...Flange portion, 1114...Laminated body, 1114A...Base material layer, 1114B...Subsurface layer, 1114C...Surface layer, 1120...Resin reservoir, 1121...First Resin reservoir, 1122...Second resin reservoir, 1130...Lid body, 1131...Laminated body, 1131A...Outer layer, 1131B...Sealing layer, 1140...Joint area, 1141...Vapor passage portion, 1141A...Unjoined area, 1141B ...weak bonding region, 1200...container, 1210...container body, 1214...laminate, 1214C...surface layer, 1220...resin reservoir, 1221...first resin reservoir, 1222...second resin reservoir, 1230...lid , 1231...Laminated body, 1231B...Sealing layer, 1300...Container, 1310...Container body, 1311...Concave portion, 1312...Flange portion, 1330...Lid body, 1340...Joint area, 1341...Vapor passage portion, 1601...Annular Sealing plate, 1602...Bulged portion, 1603...Inclined surface, 1604...Flat surface, 1605...Annular sealing plate, 2100...Container, 2110...Container body, 2111...Concave portion, 2112...Flange portion, 2114...Laminated body, 2114A...substrate layer, 2114B...surface layer, 2114P...sagging portion, 2115...notch, 2120...thin wall portion, 2130...cover, 2131...laminate, 2131A...outer layer, 2131B...sealing layer, 2140...joint area , 2141...vapor passage, 2141A...unjoined area, 2141B...weak joint area, 2200...container, 2210...container body, 2211...recess, 2212...flange, 2215...cutout, 2216...skirt, 2217...step part, 2218...Additional joining area, 2230...Lid, 2240...Joint area, 2300...Container, 2310...Container body, 2312...Flange, 2340...Joining area, 2341...Annular part, 2342...Outside protruding part, 2343...Inner extension, 2344, 2345...Additional notches, 3140...Joint area, 3141...Steam passage, 3141A...Non-joint area, 3141B...Non-joint area, SP...Inner space.

Claims (28)

1. A container, comprising:

a first container body including a recess and a flange portion formed along a peripheral edge of the recess and extending outward from the peripheral edge; and

a second container body that forms an inner space between the second container body and the recess portion by being engaged with the first container body at an engagement area formed at the flange portion,

wherein,

a structure is provided between the first container body and the second container body, the structure being configured to easily peel the second container body from the first container body by an external force and to resist an internal pressure of the internal space,

a vapor passage portion capable of communicating the internal space with an external space when the internal pressure of the internal space increases is formed in the joining region,

the vapor passage portion includes an unjoined region where the second container body is not joined to the first container body, or a weak joined region where the second container body is joined to the first container body with a relatively weak joining strength per unit area.

2. The container of claim 1, wherein,

the first container body is composed of a laminate including at least a first layer and a second layer joined to the first layer and facing the joining region,

the second container body is composed of a laminate including at least a third layer facing the joint region and a fourth layer joined to the third layer,

either one of the second layer and the third layer is a cohesive failure layer having a cohesive strength weaker than a bonding strength between the second container body and the first container body, a cohesive strength of each of the first layer to the fourth layer other than the cohesive failure layer, and interlayer bonding strengths between the first layer and the second layer and between the third layer and the fourth layer,

a first resin reservoir having a nubby-shaped cross section, which is made of the resin forming the first layer and the second layer and is inclined toward the recess side, and a second resin reservoir having a nubby-shaped cross section, which is made of the resin of the third layer and is positioned closer to the recess side than the first resin reservoir, are formed at the edge portion of the joining region on the recess side.

3. The container of claim 2, wherein,

the vapor passage portion includes a portion where the first resin reservoir and the second resin reservoir are not partially formed.

4. The container of claim 1, wherein,

the first container body is composed of a laminate including at least a first layer and a second layer,

the second container body is joined to the second layer,

the bonding strength between the second container body and the second layer is stronger than the interlayer bonding strength between the second layer and the first layer,

the second-layer defect portion is formed on the concave portion side of the joining region.

5. The container of claim 4, wherein,

in the defect portion, at least the second layer is provided with a cut, or the second layer is locally thinly formed, or the second layer is locally interrupted.

6. The container of claim 4, wherein,

the first container body includes a skirt portion formed on a peripheral edge of the flange portion, and a step portion in which a part of the peripheral edge of the skirt portion extends and protrudes in parallel with the flange portion,

the second container body is joined to the second layer at an additional joining region located at the step portion in addition to the joining region.

7. The container of claim 4, wherein,

the first container body includes a skirt portion formed on a periphery of the flange portion,

an additional defective portion of the second layer is formed in the vicinity of the outer peripheral edge of the joint region.

8. The container according to any one of claims 4 to 7,

the joining region includes an annular portion formed with a relatively narrow width with respect to the width of the flange portion, and a protruding portion protruding from the annular portion toward the peripheral edge of the flange portion.

9. The container according to any one of claims 4 to 8,

at the end of the laminate located at the periphery of the flange portion, a hanging portion is formed at the end edge of the second layer so as to cover the end edge of the first layer.

10. The container of claim 1, wherein,

the unbonded areas or the weak bond areas cross the bond areas in the width direction.

11. The container of claim 10,

the unbonded area or the weak bond area is one or more slit-shaped areas.

12. The container according to claim 10 or 11,

the unbonded area or the weak bond area obliquely crosses the bond area.

13. The container of claim 1, wherein,

the unbonded area or the weak bonding area is formed in an area including a leading end of a portion of the bonding area protruding in the width direction or an area including a top of a portion of the bonding area bulging in the width direction.

14. The container of claim 13, wherein,

the unbonded area or the weak bonding area is formed in an area including a front end of a portion of the bonding area protruding in a V-shape from the internal space side toward the external space or from the external space toward the internal space side.

15. The container of claim 13, wherein,

the unbonded area or the weak bonding area is formed in an area including a top of a portion of the bonding area bulging in a circular arc shape from the inner space side toward the outer space or from the outer space toward the inner space side.

16. The container of claim 1, wherein,

the vapor passage portion includes the non-joined region and the weak joined region arranged in parallel with each other in a width direction of the joined region,

the unbonded areas form a smaller communication path than the weakly bonded areas.

17. The container of claim 16, wherein,

the weak bond region is disposed on the inner space side,

the unbonded area is disposed on the external space side.

18. The container of claim 16, wherein,

the unbonded area is disposed on the internal space side,

the weak bond region is disposed on the external space side.

19. The container of any one of claims 16 to 18,

the weak bond region is formed over the entire circumference of the flange portion.

20. The container of any one of claims 16 to 18,

the unbonded area is in close contact with or separated from the weak bonding area in the width direction of the bonding area.

21. The container of claim 1, wherein,

the vapor passage portion includes the weak bond region,

the weak bond region is a region in which the bonding area is smaller than other bonding regions.

22. The container of claim 21, wherein,

in the weak bond region, the bond region is formed in a lattice shape.

23. The container of claim 21, wherein,

in the weak bond region, the bond region is formed to a narrow width.

24. The container of claim 21, wherein,

in the weak bond region, the bond region is formed in a dot shape.

25. The container of any one of claims 1 to 9,

the vapor passage portion includes a plurality of non-joined regions formed at a part of the joined region in the circumferential direction and independent of each other.

26. The container of claim 25, wherein,

in the vapor passage portion, substantially circular non-joined regions or rounded V-shaped non-joined regions are arranged in the joined region.

27. The container of claim 25 or 26,

each of the non-joint regions has an area of 0.1mm²The above.

28. The container of claim 27, wherein,

each of the non-joint regions has an area of 0.15mm²The above.

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