Packaging body for heat treatment and article filled with contents therein

Abstract

To provide a packaging body for heat treatment which can be filled with contents from the bottom, can be kept compact during transportation and sales, and can stand on its own when in use, and to provide an article filled with contents therein.SOLUTION: A packaging body for heat treatment 1 comprises a bag body 10 formed by two opposing side sheets 11, 12 and open at the bottom, a bottom sheet 20 arranged between the two side sheets 11, 12 at the bottom of the bag body 10 and folded into an inverted V shape, a zipper seal section 30 arranged at the top of the bag body 10, and a steam passage section for allowing steam to escape, the bottom sheet 20 is sealed only to one of the side sheets 11 and forms an opening 23 with the other side sheet 12, and opposing inner surfaces 21b, 22b are sealed by folding the bottom sheet 20 into the inverted V shape, and a seal strength between the inner surfaces 21b, 22b at 100°C is 0.5 N / 15 mm or more.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a self-supporting package for heat treatment and an article filled with contents therein. [Background technology]

[0002] Conventionally, packaged foods have been available on the market in which cooked or semi-cooked food is packed into a heat-resistant plastic package (packaging bag) and cooked in a microwave oven just before eating. However, when such packaged foods are heated in a microwave oven, the internal pressure increases due to the thermal expansion of the water vapor and air inside the package, which can cause the package to burst, scattering the contents and contaminating the inside of the microwave oven.

[0003] A method of preventing the package from bursting is to pierce the package before cooking in a microwave oven to prevent the internal pressure from increasing. However, this method causes the generated steam to immediately escape from the package, which not only reduces the steaming effect of the steam but also causes the food inside the package to dry out, resulting in a deterioration in taste. Therefore, a package with an easy-peel section that allows steam to pass through and release pressure when the internal pressure of the package increases is known.

[0004] Patent Document 1 describes a package for heat-treating contents, which has a seam seal formed so as to protrude outward from above the package, and in the center of the seam seal is formed a steam-passing area through which steam passes when the contents are heated and internal pressure increases (see Patent Document 1). One side of this package for heat treatment is provided with a zipper seal, and it is said that consumers can insert contents such as food ingredients through the zipper seal and seal it.

[0005] In recent years, development has also been underway for heat treatment packages that have a base that allows them to stand on their own and that allow the contents to be heat-treated while standing. These self-standing heat treatment packages, also known as stand-up pouches, are advantageous over flat bags in that they can secure a large internal volume. However, if the top of the heat treatment package has a spout for removing the contents or a zipper seal that allows the contents to be added later, it is difficult to fill the heat treatment package with contents from the top or side, so the contents must be filled from the bottom. However, in the case of stand-up pouches, because the bottom of the heat treatment package has a base, there is a problem in that the filling nozzle interferes with the base when attempting to fill the contents from the bottom.

[0006] Patent Document 2 describes a packaging bag (packaging body for heat treatment) comprising a first side sheet, a second side sheet, and a bottom sheet, the bottom sheet being arranged between the first side sheet and the second side sheet in a V-shaped cross-section, and having a joint around the periphery, wherein the V-shaped bottom sheet is formed by a first bottom sheet facing the first side sheet and a second bottom sheet facing the second side sheet, the lower part of the first bottom sheet having a bottom joint joined to the lower part of the first side sheet, the second bottom sheet having an opening that is not joined to the second side sheet and opens the inside of the packaging bag, and the bottom sheet having a bottom sheet joint where the opposing outer surfaces of the first bottom sheet and the second bottom sheet are joined together. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-104813 [Patent Document 2] Japanese Patent Application Publication No. 2019-18907 Summary of the Invention [Problem to be solved by the invention]

[0008] When food ingredients are filled into a packaging bag, the filled packaging bag needs to be heat sterilized. However, the packaging bag described in Patent Document 2 is configured so that the bottom sheet joint peels off when the filled packaging bag is heat sterilized. This means that by the time the filled packaging bag is transported or sold, the bottom sheet joint has already peeled off, making it impossible to maintain the packaging bag in a compact state.

[0009] Therefore, the present invention aims to provide a heat treatment package that can be filled with contents from the bottom, can be maintained in a compact state during transportation and sales, and can stand on its own when in use, as well as an article filled with contents. [Means for solving the problem]

[0010] The present invention provides a bag body 10 formed by a first side sheet 11 and a second side sheet 12 arranged opposite to each other and having an opening at the bottom; a bottom sheet 20 that is arranged between the first side sheet 11 and the second side sheet 12 at the lower part of the bag body 10 and is folded into an inverted V shape; A zipper seal portion 30 disposed at the top of the bag body 10; A steam passage for releasing internal steam during heating treatment. A heat treatment package 1 having The outer surface 21a of the first region 21 of the bottom sheet 20 facing the first side sheet 11 is sealed with the first side sheet 11, At least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 facing the second side sheet 12 and the second side sheet 12 is not sealed, forming an opening 23 that connects the inside and outside of the bag body 10, The bottom sheet 20 is folded in an inverted V shape, and the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, which face each other, are sealed between each other. The seal strength between the inner surface 21b and the inner surface 22b at 100°C is 0.5 N / 15 mm or more. This is a package 1 for heat treatment.

[0011] The present invention provides The heat treatment package 1 and the contents 2 filled in the bag 10 are included. The outer surface 22a and the second side sheet 12 are sealed to seal the inside of the bag body 10. It is an item. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a heat treatment package that can be filled with contents from the bottom, can be maintained in a compact state during transportation and sales, and can stand on its own when in use, as well as an article filled with contents. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an exploded perspective view showing the configuration of a package for heat treatment 1 according to the present invention. [Figure 2] 1A and 1B are plan views showing a package for heat treatment 1 according to the present invention, where (a) is a plan view seen from the first side sheet 11 side, and (b) is a plan view seen from the second side sheet 12 side. [Figure 3] 2 is an enlarged cross-sectional side view showing the structure of the lower part of the package for heat treatment 1 according to the present invention. FIG. [Figure 4] 1 is a plan view of a package for heat treatment according to a first embodiment of the present invention, viewed from the side where an easily peelable seal portion is provided. FIG. [Figure 5] 1 is a plan view of a package for heat treatment according to a first embodiment of the present invention, viewed from the opposite side to the side on which an easily peelable seal portion is provided. FIG. [Figure 6] 5 is a schematic cross-sectional view of the zipper seal portion of the package for heat treatment taken along line XX in FIG. 4. [Figure 7] 1 is a schematic diagram showing the state of the zipper seal when a package for heat treatment 1 (item 5) filled with contents 2 and sealed is expanded. [Figure 8] 1 is a plan view of an article 5 in which contents 2 are filled into a package for heat treatment 1 according to the present invention and sealed, as viewed from the second side sheet 12 side. [Figure 9] 1A and 1B are enlarged cross-sectional views showing the structure of the lower part of an item 5 in which contents 2 are filled and sealed in a heat treatment package 1 according to the present invention, where (a) shows the state in which the bottom sheet 20 is folded into an inverted V shape and sealed, and (b) shows the state in which the seal has been peeled off and the item is standing on its own. [Figure 10] 1 is a perspective view showing a state in which an article 5 is self-standing after being filled with contents 2 and sealed in a package for heat treatment 1 according to the present invention. [Figure 11] FIG. 10 is a plan view of a package for heat treatment according to a second embodiment of the present invention, seen from the side where an easily peelable seal portion is provided. [Figure 12] FIG. 10 is a plan view of a package for heat treatment according to a second embodiment of the present invention, seen from the opposite side to the side on which the easily peelable seal portion is provided. [Figure 13] 12 is a schematic cross-sectional view of the zipper seal portion of the package for heat treatment shown in FIG. 11 taken along the line YY. [Figure 14] FIG. 2 is a plan view of the package for heat treatment used in the examples, seen from the side where the female zipper is provided. DETAILED DESCRIPTION OF THE INVENTION

[0014] <First embodiment of packaging for heat treatment> A first embodiment of a package for heat treatment according to the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view showing the configuration of a package for heat treatment 1 according to the present invention. Fig. 2(a) is a plan view of the package for heat treatment 1 according to the present invention seen from the first side sheet 11 side, and Fig. 2(b) is a plan view of the package for heat treatment 1 according to the present invention seen from the second side sheet 12 side. Fig. 3 is an enlarged side cross-sectional view showing the structure of the lower part of the package for heat treatment 1 according to the present invention. The package for heat treatment according to the present invention is ultimately self-supporting and is particularly suitable for use when heat-treating contents in a microwave oven while standing upright, and is even more suitable for use when heat-treating food ingredients.

[0015] The package for heat treatment 1 according to the present invention has a bag 10 formed by a first side sheet 11 and a second side sheet 12 arranged opposite each other, open at the bottom, and sealed at the top by a zipper seal portion 30. As shown in Figures 1 and 2, the bag 10 may be made of two separate sheets (the first side sheet 11 and the second side sheet 12) with the side edges sealed, or the top and side edges sealed, or it may be made of a single continuous sheet folded at the side edge or top edge and with the remaining top and side edges sealed.

[0016] Considering that the contents will be heated in a microwave oven, the first side sheet 11 and the second side sheet 12 are preferably made of a plastic material that is heat-resistant to microwave heating. Specific examples of such plastic materials include polyolefins such as polyethylene and polypropylene; halogenated polyolefins such as polyvinylidene chloride and polyvinylidene fluoride; polyvinyl alcohol; polyamides such as nylon 6, nylon 6,6, and polymetaxylylene adipamide; polyesters such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate; polyacrylic acid esters such as polymethyl(meth)acrylate, polyethyl(meth)acrylate, and polybutyl(meth)acrylate; and copolymers of monomers that form these. Note that "(meth)acrylic" refers to either methacrylic or acrylic.

[0017] Specific examples of polyethylene include linear low-density polyethylene, high-pressure low-density polyethylene, high-density polyethylene, metallocene polyethylene, etc. Specific examples of polypropylene include propylene homopolymer, random or block copolymer of propylene with ethylene or 1-butene, etc.

[0018] The first side sheet 11 and the second side sheet 12 may be a single layer, or may be laminated with two or more layers by coextrusion, coating, or the like. For example, the first side sheet 11 and the second side sheet 12 preferably comprise a substrate layer and a sealant layer, and may further comprise another layer between the substrate layer and the sealant layer. Specifically, the first side sheet 11 and the second side sheet 12 can be a laminate film (e.g., PET#12 / Ny#15 / CPP#80) formed by laminating a polyethylene terephthalate / polyamide film as a substrate layer with an unstretched polypropylene film as a sealant layer. The first side sheet 11 and the second side sheet 12 may also be a gas-barrier composite film provided with a thin inorganic oxide film such as aluminum oxide or silicon oxide. This composite film can be obtained by heating and vaporizing aluminum oxide or silicon oxide alone or in a mixture under vacuum and depositing the vapor on the surface of the above-mentioned film.

[0019] The seals on the top and / or side edges of the first side sheet 11 and the second side sheet 12 may be completely sealed at 25°C and 100°C, or may be easy to open. In this case, the seal strength at 25°C and 100°C is preferably 10 to 30 N / 15 mm, more preferably 12 to 25 N / 15 mm. The seal strength at 25°C and 100°C is the value measured at 25°C and 100°C, respectively, in accordance with JIS Z0238 "Test method for sealed flexible packaging bags" (the same applies hereinafter).

[0020] As shown in Fig. 1, the package for heat treatment 1 according to the present invention has a bottom sheet 20 that is placed between a first side sheet 11 and a second side sheet 12 at the bottom of a bag body 10 and folded into an inverted V shape. This bottom sheet 20 ultimately functions as a base, allowing the package for heat treatment 1 according to the present invention to stand on its own. The bottom sheet 20 has a first region 21 facing the first side sheet 11 and a second region 22 facing the second side sheet 12. The bottom sheet 20 may be a single sheet folded at its top edge, as shown in Fig. 1, or may be two sheets whose top edges are connected.

[0021] 2 and 3, the gap between the outer surface 21a of the first region 21 of the bottom sheet 20 and the first side sheet 11 is sealed, but at least a portion of the gap between the outer surface 22a of the second region 22 of the bottom sheet 20 and the second side sheet 12 is not sealed. That is, the gap between the outer surface 21a of the first region 21 and the first side sheet 11 does not allow communication between the inside and outside of the bag body 10, whereas the unsealed portion between the outer surface 22a of the second region 22 and the second side sheet 12 forms an opening 23 that allows communication between the inside and outside of the bag body 10. With this configuration, it is possible to fill the contents through the opening 23 formed in the bottom of the package for heat treatment 1.

[0022] In addition, the bottom sheet 20 is folded into an inverted V shape, thereby sealing the opposing inner surface 21b of the first region 21 and the inner surface 22b of the second region 22. This makes it less likely that the filling nozzle will interfere with the bottom sheet 20 when filling the contents through the opening 23 formed in the bottom of the package for heat treatment 1.

[0023] Furthermore, the seal strength between the inner surface 21b and the inner surface 22b at 100°C is set to 0.5 N / 15 mm or more. This prevents the inner surface 21b from peeling off from the inner surface 22b even when the package for heat treatment 1 filled with contents is heat sterilized, allowing the package to remain compact during transportation and sales. The seal strength between the inner surface 21b and the inner surface 22b at 100°C is preferably 1 N / 15 mm or more, and more preferably 2 N / 15 mm or more. The seal strength between the inner surface 21b and the inner surface 22b at 100°C can be, for example, 30 N / 15 mm or less.

[0024] Furthermore, from the viewpoint of ultimately enabling the package for heat treatment 1 to stand on its own, it is preferable that the inner surface 21b and the inner surface 22b are easily peelable. More specifically, the seal strength between the inner surface 21b and the inner surface 22b at 25°C is preferably 0.5 to 30 N / 15 mm. This allows the user to peel the inner surface 21b and the inner surface 22b during use, thereby enabling the package for heat treatment 1 to stand on its own. The seal strength between the inner surface 21b and the inner surface 22b at 25°C is more preferably 1 to 25 N / 15 mm, and even more preferably 2 to 10 N / 15 mm.

[0025] 2 and 3, there is preferably an unsealed area at the center of the first upper portion between the outer surface 21a of the first region 21 and the first side sheet 11, so that the first region 21 of the bottom sheet 20 will ultimately function as a base material. Regarding the seal strength between the outer surface 21a of the first region 21 and the first side sheet 11, the same embodiment as the seal strength of the upper edges and / or side edges of the first side sheet 11 and the second side sheet 12 described above can be adopted.

[0026] 2(a), it is preferable to provide an unsealed region 11x at the lower end between the outer surface 21a of the first region 21 and the first side sheet 11. This allows the user to easily pinch the unsealed region 11x of the first side sheet 11 with their fingers and peel the inner surface 21b from the inner surface 22b. The shape of the unsealed region 11x is arbitrary. For example, a line seal can be provided at a predetermined height (preferably 3 to 30 mm) from the lower end of the first side sheet 11 to form the unsealed region 11x below the line seal. Alternatively, a rectangular unsealed region 11x (preferably 30 to 80 mm wide x 3 to 30 mm high) can be formed in the center of the lower end of the first side sheet 11.

[0027] At least a portion of the space between the outer surface 22a of the second region 22 and the second side sheet 12 is not sealed, but there may be a sealed region as long as an opening 23 that connects the inside and outside of the bag 10 can be formed. For example, it is preferable that both sides between the outer surface 22a of the second region 22 and the second side sheet 12 are sealed. The seal strength can be the same as that of the top and / or side edges of the first side sheet 11 and the second side sheet 12 described above.

[0028] However, since the package for heat treatment 1 is sealed while filled with the contents, it is preferable that the outer surface 22a of the second region 22 is heat-sealable to the second side sheet 12. Regarding the seal strength when heat-sealed, the same embodiment as the seal strength of the top edge and / or side edge of the first side sheet 11 and the second side sheet 12 described above can be adopted.

[0029] Considering that the bottom sheet 20 will be heated in a microwave oven, it is preferable that the bottom sheet 20 be made of a plastic material that is heat-resistant to microwave heating. Specific examples of such plastic materials are the same as those of the first side sheet 11 and the second side sheet 12 described above. The plastic material that constitutes the inner surface 21b and the inner surface 22b can be polyvinylidene chloride (PVDC), etc., from the viewpoint of the seal strength at 25°C and 100°C described above. In other words, it is preferable that both layers that constitute the inner surface 21b and the inner surface 22b be made of polyvinylidene chloride.

[0030] The bottom sheet 20 may be a single layer, or may be laminated with two or more layers by coextrusion, coating, or the like. For example, the bottom sheet 20 preferably comprises an inner release layer constituting the inner surfaces 21b and 22b, a base layer, and an outer sealant layer constituting the outer surfaces 21a and 22a. Other layers may be present between the base layer and the inner release layer and / or the outer sealant layer. Specifically, the bottom sheet 20 may be a laminated film (e.g., PVDC#1 / Ny#15 / PET#12 / Ny#15 / CPP#80) in which a polyethylene terephthalate / polyamide film serving as a base layer is bonded to one side thereof as an inner release layer constituting the inner surfaces 21b and 22b, and an unstretched polypropylene film is bonded to the other side thereof as an outer sealant layer constituting the outer surfaces 21a and 22a. The first side sheet 11 and the second side sheet 12 may also be a gas-barrier composite film provided with a thin inorganic oxide film such as aluminum oxide or silicon oxide. This composite film can be obtained by heating and vaporizing aluminum oxide or silicon oxide alone or in a mixture under vacuum, and depositing the vapor on the surface of the above-mentioned film.

[0031] The package for heat treatment 1 according to the present invention has a zipper seal portion 30 arranged at the top of the bag 10 and a steam passage portion for allowing internal steam to escape during heat treatment. In particular, the steam passage portion is configured to allow internal steam to escape when the contents (particularly food ingredients) are heated in a microwave oven while the package is standing upright. Fig. 4 is a plan view of the package for heat treatment 1 according to the first embodiment of the present invention, seen from the side where the easy-peel seal portion is provided. Fig. 5 is a plan view of the package for heat treatment 1 according to the first embodiment of the present invention, seen from the side opposite to the side where the easy-peel seal portion is provided. Fig. 6 is a schematic cross-sectional view of the zipper seal portion of the package for heat treatment 1 according to Fig. 4, taken along line XX. Fig. 7 is a schematic view showing the state of the zipper seal portion when the package for heat treatment 1 (item 5) filled and sealed with the contents 2 expands.

[0032] The zipper seal portion 30 has a male zipper 31 and a female zipper 32, an example of which is shown in Figure 6. The male zipper 31 and female zipper 32 are respectively joined to the inside of the bag body 10 (the second side sheet 12 and the first side sheet 11), and can be sealed (tightly) by fitting the convex portion of the male zipper 31 into the concave portion of the female zipper 32 to form a fitting portion. There may be multiple male zippers and female zippers as long as they fit together. When such a zipper seal portion 30 is provided, it is difficult to fill the package for heat treatment 1 with contents such as seasonings or ingredients from the top or side, and it is necessary to fill the package for heat treatment 1 with contents from the bottom, so the application of the present invention is very effective.

[0033] In this embodiment, the male zipper 31 is heat-sealed at two locations on the contact surface 33 that comes into contact with the bag body 10 (second side sheet 12): one on the inside side of the bag body 10 (the lower side in Fig. 5, the right side in Fig. 6) and the other on the outside side of the bag body 10 (the upper side in Fig. 5, the left side in Fig. 6), to form a joint 35. The joint 35 may also be formed over the entire contact surface 33.

[0034] In contrast, the female zipper 32 has, on the contact surface 34 that comes into contact with the bag body 10 (first side sheet 11), an area A that is joined to the bag body 10 on the outer side of the bag body 10 (upper side in Figure 4, left side in Figure 6), and an area (non-joined area) B that is not joined to the bag body 10 from the end of the contact surface 34 that comes into contact with the bag body 10 on the inner side of the bag body 10 (lower side in Figure 4, right side in Figure 6) toward the outside of the bag body 10 (upper direction in Figure 4, left direction in Figure 6).

[0035] Region A includes an easily peelable seal 36 and a joint 37 that are easily peeled when the contents 2 in an article 5 (e.g., the article 5 shown in Figures 8 to 10 ) sealed in a heat treatment package 1 are heat-treated and the internal pressure rises. By including the above-described region B and the easily peelable seal 36, when the article 5 expands due to heat treatment, pressure is applied to the easily peelable seal 36 beyond region B, causing the easily peelable seal 36 to be opened and the pressure to be released. That is, the easily peelable seal 36 functions as a vapor passage for allowing internal steam to escape during heat treatment. As a result, the article 5 can be prevented from bursting during heat treatment. Furthermore, compared to a structure with a conventional jointed seal, the number of film parts can be reduced, preventing the bag 10 from becoming complicated, even for a self-standing bag 10, and facilitating bag production. The joint 37 is heat-sealed in the same manner as the joint 35 described above.

[0036] It is preferable that the easily peelable seal portion 36 has a seal strength weaker than the fitting strength of the joints 35, 37 and the zipper fitting portion in an atmosphere at 90°C. This allows the easily peelable seal portion 36 to peel off before the joints and zipper fitting portion are opened when the contents are heat-treated and the internal pressure of the package for heat treatment 1 (item 5) increases, so that the pressure can be more reliably released from the opening formed by the peeling.

[0037] The heat seal strength of the easy peel seal portion 36 in a 90°C atmosphere is preferably 12 N / 15 mm or less, and more preferably 8 N / 15 mm or less. The heat seal strength of the easy peel seal portion 36 in a 90°C atmosphere may be 0 N / 15 mm, but is preferably 0.1 N / 15 mm or more. The easy peel seal portion 36 may be completely sealed at room temperature, or may be easily openable. The seal strength of the easy peel seal portion 36 at room temperature is preferably 0.1 to 30 N / 15 mm, and more preferably 0.2 to 25 N / 15 mm.

[0038] The easily peelable seal portion 36, which is completely sealed at room temperature and has a heat seal strength of 12 N / 15 mm or less in a 90°C atmosphere, can be achieved by sandwiching an easily openable film made of polyolefin (for example, polyethylene with a melting point of 120°C or less (preferably 110°C or less) or polypropylene with a melting point of 160°C or less (preferably 150°C or less)) between the bag body 10 and the film that makes up the zipper seal portion 30. The melting point is a value measured in accordance with JIS K 7121. The easily peelable seal portion 36 can also be formed by heat sealing with a lower amount of heat than that used to form the joint portions 35 and 37 by heat sealing.

[0039] It is preferable that the easily peelable seal portion 36 is provided in the center of the region A as in the illustrated configuration, but this is not limitative. The width W1 of the easily peelable seal portion 36 is preferably 5 to 100 mm, more preferably 10 to 80 mm, and even more preferably 15 to 60 mm. Furthermore, the height H1 of the easily peelable seal portion 36 in the vertical direction in FIG. 2 is preferably 1 to 7 mm, more preferably 1 to 6 mm, and even more preferably 1 to 5 mm.

[0040] 6 and 7, in this embodiment, the size of the contact surface 34 of the female zipper 32 provided with region B that comes into contact with the bag body 10 is longer toward the interior of the bag body 10 (the lower side in FIGS. 4 and 5) than the size of the contact surface 33 of the male zipper 31 that comes into contact with the bag body 10. This more effectively prevents the expansion pressure (internal pressure) from concentrating on the mating portion between the male zipper 31 and the female zipper 32. Note that the contact surface 33 and the contact surface 34 may be the same size. Furthermore, it is sufficient that the size of the contact surface 34 of the female zipper 32 provided with region B that comes into contact with the bag body 10 is at least partially longer toward the interior of the bag body 10 (the lower side in FIGS. 4 and 5) than the size of the contact surface 33 of the male zipper 31 that comes into contact with the bag body 10.

[0041] In the above explanation, the case where the area A, the area B and the easy-peel seal portion 36 are provided on the female chuck 32 side has been described, but the area A, the area B and the easy-peel seal portion 36 may also be provided on the male chuck 31 side.

[0042] With this type of package for heat treatment 1, the package for heat treatment 1 (item 5) filled with and sealed with the contents 2 can be heated in a microwave oven or the like while the package for heat treatment 1 (item 5) is self-standing. Furthermore, by providing the zipper seal portion 30 with the easy-peel seal portion 36, fluctuations in pressure inside the package due to water vapor inside the item 5 or thermal expansion of the internal air can be suppressed. Furthermore, during heat treatment, the easy-peel seal portion 36 opens due to an increase in internal pressure, effectively preventing the zipper fitting portion of the zipper seal portion 30 from opening. Furthermore, by providing the easy-peel seal portion 36 in the zipper seal portion 30, the number of film parts can be reduced compared to a conventional structure with a joint seal portion. Therefore, even if the bag 10 is self-standing, the structure does not become complicated and the bag can be easily manufactured.

[0043] <Goods> Next, one embodiment of the article according to the present invention will be described with reference to the drawings. Fig. 8 is a view of an article 5 obtained by filling a package for heat treatment 1 according to the present invention with contents 2 and sealing it, as viewed from the side of the second side sheet 12. Fig. 9 is an enlarged cross-sectional view showing the structure of the lower part of the article 5 obtained by filling a package for heat treatment 1 according to the present invention with contents 2 and sealing it, Fig. 9(a) shows the bottom sheet 20 folded in an inverted V shape and sealed, and Fig. 9(b) shows the article in a self-standing state after the seal has been peeled off. Fig. 10 is a perspective view showing the article 5 obtained by filling a package for heat treatment 1 according to the present invention with contents 2 and sealing it and allowing it to stand on its own. The contents 2 are preferably foodstuffs, more preferably foodstuffs to be heated in a microwave oven. In this case, the article 5 is a foodstuff package product.

[0044] As shown in Fig. 10, an article 5 according to the present invention comprises the above-mentioned package for heat treatment 1 and contents 2 filled in the bag body 10. As described above, in the package for heat treatment 1, at least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 and the second side sheet 12 is not sealed, forming an opening 23 that connects the inside and outside of the bag body 10. The contents 2 are filled through the opening 23, and as shown in Fig. 9(a), the space between the outer surface 22a of the second region 22 and the second side sheet 12 is sealed (preferably by heat sealing), thereby forming an article 5 with the inside of the bag body 10 sealed.

[0045] In order to allow the second region 22 of the bottom sheet 20 to ultimately function as a base material, it is preferable that there is an unsealed region at the top center between the outer surface 22a of the second region 22 and the second side sheet 12, as shown in Fig. 8, similar to the first region 21. Regarding the seal strength between the outer surface 22a of the second region 22 and the second side sheet 12, the same embodiments as those for the seal strength of the top edges and / or side edges of the first side sheet 11 and the second side sheet 12 described above can be adopted.

[0046] As shown in FIG. 8, it is preferable to provide an unsealed region 12x at the lower end between the outer surface 22a of the second region 22 and the second side sheet 12. This allows the user to easily pinch the unsealed region 12x of the second side sheet 12 with their fingers and peel the inner surface 21b from the inner surface 22b. The shape of the unsealed region 12x is arbitrary. For example, a line seal can be provided at a predetermined height (preferably 3 to 30 mm) from the lower end of the second side sheet 12 to form the unsealed region 12x below the line seal. Alternatively, a rectangular unsealed region 12x (preferably 30 to 80 mm wide x 3 to 30 mm high) can be formed in the center of the lower end of the second side sheet 12. The shapes of the unsealed region 11x and the unsealed region 12x may be the same or different.

[0047] In the heat treatment package 1 or the article 5, the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, which are opposed by folding the bottom sheet 20 into an inverted V shape, are preferably sealed by heat sealing. To improve the efficiency of the manufacturing process, it is preferable to simultaneously seal the outer surface 21a of the bottom sheet 20 and the side sheet 11 with the heat used for heat sealing, or to simultaneously seal the outer surface 22a of the bottom sheet 20 and the side sheet 12 with the heat used for heat sealing after filling the contents 2.

[0048] In this case, the package for heat treatment 1 or the article 5 preferably has an unsealed area 20x at the lower end between the inner surface 21b of the first region 21 and the inner surface 22b of the second region 22, as shown in Fig. 3 or 9. This allows a user to easily pinch the unsealed area 20x with their fingers and peel the inner surface 21b from the inner surface 22b. The unsealed area 20x may have any shape. For example, a line seal may be applied at a predetermined height (preferably 3 to 30 mm) from the lower ends of the first region 21 and the second region 22 to form the unsealed area 20x below the line seal. Alternatively, a rectangular unsealed area 20x (preferably 30 to 80 mm wide x 3 to 30 mm high) may be formed in the center of the lower ends of the first region 21 and the second region 22.

[0049] In such an article 5, the space between the inner surface 21b and the inner surface 22b remains sealed even after heat sterilization, so that the article 5 can be maintained in a compact state during transportation and sale. When in use, the user can peel the space between the inner surface 21b and the inner surface 22b, allowing the article 5 to stand on its own.

[0050] <Second embodiment of packaging for heat treatment> Next, a second embodiment of a package for heat treatment 1 according to the present invention will be described. Fig. 11 is a plan view of the package for heat treatment 1 according to the second embodiment of the present invention, seen from the side where the easy peelable seal portion is provided, Fig. 12 is a plan view of the package for heat treatment 1 according to the second embodiment of the present invention, seen from the opposite side to the side where the easy peelable seal portion is provided, and Fig. 13 is a schematic cross-sectional view of the zipper seal portion YY of the package for heat treatment 1 shown in Fig. 11. The following describes the configurations that differ from those of the first embodiment described above, and the description of the common configurations will be omitted. The packaging body for heat treatment 1 according to the second embodiment differs from that of the first embodiment described above in the configuration of the zipper seal portion 30, but other configurations are the same as those of the first embodiment described above.

[0051] The zipper seal portion 30 according to this embodiment has a male zipper 31 and a female zipper 32, an example of which is shown in Figure 13. The male zipper 31 and female zipper 32 are respectively joined to the inside of the bag body 10 (the second side sheet 12 and the first side sheet 11), and can be sealed (tightly) by fitting the convex portion of the male zipper 31 into the concave portion of the female zipper 32 to form a fitting portion. There may be multiple male zippers and female zippers as long as they fit together.

[0052] In this embodiment, the male zipper 31 is heat-sealed at two locations on the contact surface 33 that comes into contact with the bag body 10 (second side sheet 12): one on the inside side of the bag body 10 (the lower side in FIG. 12, the right side in FIG. 13) and the other on the outside side of the bag body 10 (the upper side in FIG. 12, the left side in FIG. 13), to form a joint 35. The joint 35 may also be formed over the entire contact surface 33.

[0053] In contrast, the female zipper 32 has a strip-shaped region C that is joined to the bag body 10 on the outer side of the bag body 10 (upper side in Figure 11, left side in Figure 13) of the contact surface 34 that comes into contact with the bag body 10 (first side sheet 11), and a strip-shaped region D that is joined to the bag body 10 on the inner side of the bag body 10 (lower side in Figure 11, right side in Figure 13) of the contact surface 34 that comes into contact with the bag body 10.

[0054] Region C has a non-bonded portion 38 at its center that is not bonded to the bag body 10. Region D has an easy-peel seal portion 39 at its center that is easily peeled when the male zipper 31 and female zipper 32 are released from engagement. The length W2 of the non-bonded portion 38 in a direction parallel to the zipper seal portion 30 is 25 to 70 mm, and the length W3 of the easy-peel seal portion 39 in a direction parallel to the zipper seal portion 30 is 20 mm or more. The non-bonded portion 38 and the easy-peel seal portion 39 may be located anywhere in region C or region D as long as they are arranged so that they face each other. However, considering the ease of releasing the zipper engagement, it is preferable that the non-bonded portion 38 and the easy-peel seal portion 39 be located at the center of region C and region D, respectively, as shown in the configuration illustrated. The number of non-bonded portions 38 and easy-peel seal portions 39 is not limited to one each, and two or more of each may be provided.

[0055] With this configuration, the interior of the bag 10 is sealed before the zipper seal portion 30 is released. However, when the zipper seal portion 30 is released to open the bag 10, the non-bonded portion 38 opens, causing the easy-peel seal portion 39 to peel off. Therefore, when the contents 2 are placed in the bag 10, the zipper seal portion 30 is closed, and the bag 10 is heated, the easy-peel seal portion 39, which has peeled away from the non-bonded portion 38, serves as a steam outlet (steam passage), preventing an increase in internal pressure. In other words, the easy-peel seal portion 39 functions as a steam passage portion for allowing internal steam to escape during heat treatment. As a result, the heat treatment package 1 is prevented from bursting during heat treatment. Furthermore, compared to a conventional structure with a palm-seamed seal portion, the number of film parts can be reduced. This prevents the bag 10 from becoming complicated, even for a self-standing bag 10, and facilitates bag production. The joints between regions C and D are heat-sealed in the same manner as the joint 35 described above.

[0056] The length W2 of the non-bonding portion 38 in the direction parallel to the zipper seal portion 30 is 25 to 70 mm, preferably 30 to 65 mm, and more preferably 35 to 60 mm. The length W3 of the easy-peel seal portion 39 in the direction parallel to the zipper seal portion 30 is 20 mm or more, preferably 20 to 200 mm, and more preferably 25 to 100 mm.

[0057] The height H2 of the non-bonded portion 38 (region C) in the vertical direction in FIG. 11 is preferably 1 to 7 mm, more preferably 1 to 6 mm, and even more preferably 1 to 5 mm. 11 of the easily peelable seal portion 39 (area D) is preferably 1 to 7 mm, more preferably 1 to 6 mm, and even more preferably 1 to 5 mm, which allows the easily peelable seal portion 39 to be more reliably peeled off when the engagement of the zipper seal portion 30 is released.

[0058] The easily peelable seal portion 39 preferably has a seal strength at room temperature that is weaker than the fitting strength of the joining portion 35 and the zipper fitting portion. The seal strength of the easily peelable seal portion 39 at room temperature is preferably 0.1 to 30 N / 15 mm, and more preferably 0.2 to 25 N / 15 mm.

[0059] The easily peelable seal portion 39, which is completely sealed at room temperature and has a heat seal strength of 12 N / 15 mm or less in a 90°C atmosphere, can be achieved by sandwiching an easily openable film, such as a polyolefin (for example, a polyethylene with a melting point of 120°C or less (preferably 110°C or less) or a polypropylene with a melting point of 160°C or less (preferably 150°C or less)), between the bag body 10 and the film that constitutes the zipper seal portion 30. The melting point is a value measured in accordance with JIS K 7121. The easily peelable seal portion 39 can also be formed by heat sealing with a lower amount of heat than that required to form the joint portion 35 by heat sealing.

[0060] In the above description, the area C and the area D are provided on the female chuck 32 side, but the area C and the area D may be provided on the male chuck 31 side.

[0061] With this type of package for heat treatment 1, the contents can be heat-treated in a microwave oven or the like while the package for heat treatment 1 is self-standing. Furthermore, because the easily peelable seal portion 39 peels when the zipper seal portion 30 is opened, fluctuations in pressure inside the package due to the thermal expansion of water vapor or the internal air inside the package can be suppressed. Furthermore, because the pressure inside the package can be released through the opened easily peelable seal portion 39, rupture of the package and opening of the zipper fitting portion of the zipper seal portion 30 can be effectively prevented. Furthermore, by providing the non-bonded portion 38 and the easily peelable seal portion 39 in the zipper seal portion 30, the number of film parts can be reduced compared to a conventional structure with a jointed seal portion. Therefore, even though the bag 10 is self-standing, the structure of the bag 10 can be prevented from becoming complicated, and bag production can be facilitated. Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. [Example]

[0062] <Experimental Example (1)> Example 1 A heat treatment package 1 (170 mm long x 200 mm wide x 36 mm deep) with a zipper seal portion 30 shown in Figures 2 to 6 was fabricated. The first side sheet 11 and second side sheet 12 were made of polyethylene terephthalate (PET#12) / nylon (Ny#15) / unstretched polypropylene (CPP#80), and the bottom sheet 20 was made of polyvinylidene chloride (PVDC#1) / nylon (Ny#15) / polyethylene terephthalate (PET#12) / nylon (Ny#15) / unstretched polypropylene (CPP#80). The easily peelable seal portion 36 was formed by heat sealing with a lower heat amount than that used to form the joint portion 37 (W1 = 20 mm, H1 = 2 mm). As shown in Figure 6, the size of the contact surface 34 with the first side sheet 11 is longer toward the inside of the bag body 10 than the contact surface 33 with the second side sheet 12, and an area B (width 200 mm) is formed on the contact surface 34 side.

[0063] <Example 2> A heat treatment package 1' (170 mm long x 200 mm wide x 36 mm deep) was produced as shown in FIG. 14. The first and second side sheets 11 and 12 were made of polyethylene terephthalate (PET#12) / nylon (Ny#15) / unstretched polypropylene (CPP#80), and the bottom sheet 20 was made of polyvinylidene chloride (PVDC#1) / nylon (Ny#15) / polyethylene terephthalate (PET#12) / nylon (Ny#15) / unstretched polypropylene (CPP#80). Unlike Example 1, a joint 37 was also provided on the underside of the female zipper 32, and a non-jointed portion 40 (20 mm wide) was formed in the portion facing the easy-peel seal portion 36. The configuration of the male zipper 31 side was the same as in Reference Example 1. The easily peelable seal portion 36 was formed by heat sealing with a lower amount of heat than that used to form the joint portion 37 (W1=20 mm).

[0064] <Rating 1> 100 g of water was poured into each of the packages for heat treatment in Examples 1 and 2 through the opening 23, completely sealing the gap between the outer surface 22a and the second side sheet 12. After that, the packages were immersed in water at 100°C and subjected to heat sterilization, but the seal between the inner surface 21b and the inner surface 22b of each of the packages for heat treatment in Examples 1 and 2 did not break.

[0065] <Rating 2> Three bags of heat treatment packages for each of Examples 1 and 2 were prepared, and 100 g of water was poured into each heat treatment package through opening 23 to completely seal the gap between outer surface 22a and second side sheet 12. Next, the unsealed region 12x of second side sheet 12 was pinched with fingers to peel the gap between inner surface 21b and inner surface 22b, and then heated in a 600W microwave oven. When the steaming state was then checked, it was confirmed that no openings were found in the zipper fitting portion and that steam was passing through the easy-peel seal portion in all three bags of the heat treatment package of Example 1. In contrast, openings were found in the zipper fitting portion in all three bags of the heat treatment package of Example 2.

[0066] From the above results, it can be seen that in the package for heat treatment of Example 1, the easily peelable seal portion opens when heat treatment is performed, allowing the internal pressure to escape. Furthermore, the package for heat treatment of Example 1 could be made into a bag more easily than the package for heat treatment having a palm-sealed portion.

[0067] <Experimental Example (2)> Example 3 A heat treatment package 1 (170 mm long x 200 mm wide x 36 mm deep) was fabricated as shown in Figures 2, 3, and 11-13. The first and second side sheets 11 and 12 were constructed of polyethylene terephthalate (PET#12) / nylon (Ny#15) / unstretched polypropylene (CPP#80), and the bottom sheet 20 was constructed of polyvinylidene chloride (PVDC#1) / nylon (Ny#15) / polyethylene terephthalate (PET#12) / nylon (Ny#15) / unstretched polypropylene (CPP#80). The easily peelable seal area 39 was formed by heat sealing with a lower heat amount than that used to form the bonded area 35. The dimensions of the non-bonded area 38 were W2 = 50 mm and H2 = 2 mm. The dimensions of the easily peelable seal area 39 were W3 = 20 mm and H3 = 2 mm.

[0068] <Examples 4 to 7> A package for heat treatment 1 was produced in the same manner as in Example 3, except that the dimensions of the non-bonded portion 38 and the easily peelable seal portion 39 were changed as shown in Table 1.

[0069] [Table 1]

[0070] <Rating 3> 100 g of water was poured into each of the packages for heat treatment in Examples 3 to 7 through the opening 23, and the package was completely sealed between the outer surface 22a and the second side sheet 12. After that, the package was immersed in water at 100°C and subjected to heat sterilization, but the seal between the inner surface 21b and the inner surface 22b of each of the packages for heat treatment in Examples 3 to 7 did not break.

[0071] <Opening test> The packages for heat treatment of Examples 3 to 7 were prepared, and when the fastener seal portion 30 was released, it was checked whether the easily peelable seal portion 39 peeled off, and the results were evaluated according to the following criteria. A: The easily peelable seal portion 39 peeled off. B: The zipper was difficult to release, and the easy-peel seal portion 39 was difficult to peel off. C: The easily peelable seal portion 39 did not peel off.

[0072] <Steam test> Three bags of heat treatment packages for Examples 3 to 7 were prepared, and 100 g of water was poured into each heat treatment package through the opening 23, completely sealing the gap between the outer surface 22a and the second side sheet 12. Next, the zipper seal portion 30 was released and then reattached. Next, the unsealed area 12x of the second side sheet 12 was pinched with fingers to peel the gap between the inner surface 21b and the inner surface 22b, and the bag was heated in a 600W microwave oven. The steam permeability was evaluated according to the following criteria. A: All packages were in good steaming condition. B: Poor steam passage was observed in some of the 3 bags, and the zipper seal portion 30 was opened. C: Poor steam passage was observed in all packages, and the zipper seal portion 30 was opened.

[0073] From the above results, it can be seen that in the packages for heat treatment of Examples 3 to 5, when the zipper seal portion 30 is opened, the easy peel seal portion 39 is opened, allowing the internal pressure to escape. Furthermore, the packages for heat treatment of Examples 3 to 5 could be produced into bags more easily than the packages for heat treatment having a seam-seated portion. [Explanation of symbols]

[0074] 1, 1' Heat treatment packaging 2 Contents 5 Goods 10 Bag body 11 First side sheet 11x Unsealed Areas 12 Second side sheet 12x unsealed areas 20 Bottom sheet 20x unsealed area 21 The First Region 21a Outer surface 21b Inner surface 22 The Second Realm 22a Outer surface 22b Inner surface 23 Opening 30 Zipper seal 31 Male zipper 32 Female zipper 33 Contact surface 34 Contact surface 35 Joint 36 Easy-peel seal part 37 Joint 38 Non-joint part 39 Easy-peel seal part 40 Non-joint part A, B area C, D area

Claims

1. a bag body 10 formed by a first side sheet 11 and a second side sheet 12 arranged opposite to each other and having an opening at the bottom; a bottom sheet 20 disposed between the first side sheet 11 and the second side sheet 12 at the lower part of the bag body 10 and folded into an inverted V shape; A zipper seal portion 30 disposed at the top of the bag body 10; A steam passage for releasing internal steam during heating treatment. A heat treatment package 1 having The outer surface 21a of the first region 21 of the bottom sheet 20 facing the first side sheet 11 is sealed between the first side sheet 11, At least a portion of the space between the outer surface 22a of the second region 22 of the bottom sheet 20 facing the second side sheet 12 and the second side sheet 12 is not sealed, forming an opening 23 that connects the inside and outside of the bag body 10, The bottom sheet 20 is folded in an inverted V shape, and an inner surface 21 b of the first region 21 and an inner surface 22 b of the second region 22 are opposed to each other, and the space between these surfaces is sealed. The seal strength between the inner surface 21b and the inner surface 22b at 100°C is 0.5 N / 15 mm or more. Heat treatment packaging 1.

2. The zipper seal portion 30 has a male zipper 31 and a female zipper 32 joined to the inside of the bag body 10, One of the male zipper 31 and the female zipper 32 has, on a contact surface that comes into contact with the bag body, a region A that is joined to the bag body 10 on the outer side of the bag body, and a region B that is not joined to the bag body 10 from an end on the inner side of the bag body 10 toward the outer side of the bag body, The region A has an easily peelable seal portion 36 that is easily peeled off to become the steam passage portion when the contents are heated and the internal pressure increases. The heat treatment package 1 according to claim 1.

3. The easily peelable seal portion 36 is provided in the center of the region A. The heat treatment package 1 according to claim 2.

4. The width W of the easily peelable seal portion 36 １ is 5 to 100 mm The heat treatment package 1 according to claim 2.

5. The heat seal strength of the easily peelable seal portion 36 in an atmosphere of 90°C is 12 N / 15 mm or less. The heat treatment package 1 according to claim 2.

6. The size of each contact surface of the male zipper 31 and the female zipper 32 that contacts the bag body 10 is such that the contact surface where the region B is provided has a longer portion toward the inside of the bag body. The heat treatment package 1 according to claim 2.

7. The zipper seal portion 30 has a male zipper 31 and a female zipper 32 joined to the inside of the bag body 10, One of the male zipper 31 and the female zipper 32 has a strip-shaped region C that is joined to the bag body on the outer side of the bag body of the contact surface that comes into contact with the bag body, and a strip-shaped region D that is joined to the bag body on the inner side of the bag body of the contact surface that comes into contact with the bag body, The region C has a non-bonded portion 38 that is not bonded to the bag body, The region D has an easily peelable seal portion 39 that is easily peeled off to become the vapor passage portion when the male zipper and the female zipper are released from engagement with each other, The length W of the non-bonded portion 38 in the direction parallel to the zipper seal portion 30 ２ is 25 to 70 mm, The length W of the easily peelable seal portion 39 in the direction parallel to the zipper seal portion 30 ３ is 20 mm or more The heat treatment package 1 according to claim 1.

8. The height H of the non-jointed portion 38 ２ is 1 to 7 mm The package for heat treatment 1 according to claim 7.

9. The height H of the easily peelable seal portion 39 ３ is 1 to 7 mm The package for heat treatment 1 according to claim 7.

10. The heat seal strength of the easily peelable seal portion 39 at room temperature is 0.1 to 30 N / 15 mm. The package for heat treatment (1) according to claim 7.

11. The seal strength between the inner surface 21b and the inner surface 22b at 25°C is 0.5 to 30 N / 15 mm. The heat treatment package 1 according to claim 1.

12. The layers constituting the inner surface 21b and the inner surface 22b are both formed of polyvinylidene chloride. The heat treatment package 1 according to claim 1.

13. An unsealed area 20x is provided at the lower end between the inner surface 21b and the inner surface 22b. The heat treatment package 1 according to claim 1.

14. The lower end between the outer surface 21a and the first side sheet 11 has an unsealed area 11x. The heat treatment package 1 according to claim 1.

15. The outer surface 22a is heat-sealable to the second side sheet 12. The heat treatment package 1 according to claim 1.

16. A heat treatment package (1) according to any one of claims 1 to 15, and a content (2) filled in the bag (10), The outer surface 22a and the second side sheet 12 are sealed to seal the inside of the bag body 10. Goods.

17. The outer surface 22a and the second side sheet 12 have an unsealed area 12x at the lower end.

17. The article of claim 16.

18. The seal between the inner surface 21b and the inner surface 22b can be peeled off to make the sheet self-standing.

17. The article of claim 16.

Images