Method for manufacturing heat-treatable package, method for manufacturing article filled with content, and heat sealing method

Abstract

To provide a manufacturing method of a package 1 for heat treatment capable of easily manufacturing the package 1 for heat treatment capable of heating a content in a self-standing state, a manufacturing method of an article capable of easily heating the content in the self-standing state, and a heat sealing method capable of easily forming a complete seal part and an easily peelable seal part.SOLUTION: A manufacturing method of a package 1 for heat treatment includes a bag body 10 formed of two side surface sheets and having an opening at a lower part, a chuck seal part 30 arranged at an upper part of the bag body 10, and a steam passing part, and a female chuck 32 has an area A joined to the bag body 10 on a bag body outer side on a contact surface in contact with the bag body 10. The method includes a first heat-sealing step of heat-sealing the entire surface of an area A' to be the area A, and a second heat-sealing step of simultaneously heat-sealing the entire surface of the area A' except an area to be the easily peelable seal part 36.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a method for producing a package for heat treatment, a method for producing an article filled with the package, and a heat-sealing method. [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 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, the package having a seam seal portion formed to protrude outward from above the package, a steam-passing region formed in the center of the seam seal portion through which steam passes when the contents are heat-treated and internal pressure increases, the steam-passing region having a first non-sealed region opening on the outer side of the seam seal portion, the first non-sealed region having a first region with a constant opening width toward the inner side of the package of the seam seal portion, and a second region formed continuous with the first region and whose opening width gradually decreases toward the inner side of the package, the opening width of the first region being 20 to 40 mm (see Patent Document 1). One side of this package for heat treatment has a zipper seal portion, allowing consumers to insert contents such as foodstuffs through the zipper seal portion and seal it. Furthermore, in recent years, development has been made of a package for heat treatment that can heat treat the contents in a self-standing state (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-104813 [Patent Document 2] Japanese Patent Application Publication No. 2019-177905 Summary of the Invention [Problem to be solved by the invention]

[0006] However, a heat treatment package that has a girth seal and is self-supporting has many film parts such as a base and girth portion, and if a zipper seal is also added, the number of parts becomes too large, which can complicate bag production and reduce productivity. Also, if the girth seal and zipper seal are too close to each other, the bag production machinery will interfere with each other, making bag production difficult.

[0007] Therefore, the present invention aims to provide a method for manufacturing a heat treatment package 1 that can easily manufacture a heat treatment package 1 that can heat the contents while standing upright, to provide a method for manufacturing an article that can heat the contents while standing upright, and to provide a heat sealing method that can easily form a complete seal portion and an easily peelable seal portion. [Means for solving the problem]

[0008] 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 zipper seal portion 30 disposed at the top of the bag body 10; A steam passage for releasing internal steam during heating treatment. and 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 portion 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 easily peels off to become the steam passage portion when the contents are heated and the internal pressure increases, a first heat-sealing step of heat-sealing the entire surface of the region A' that will become the region A; a second heat-sealing step of simultaneously heat-sealing the entire area of ​​the region A' except for a region 36' that will become the easily peelable seal portion 36; have This is a method for producing the package for heat treatment 1.

[0009] 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 zipper seal portion 30 disposed at the top of the bag body 10; A steam passage for releasing internal steam during heating treatment. and 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 38a that is not bonded to the bag body, The region D has an easily peelable seal portion 39a that is easily peeled off when the male zipper and the female zipper are released from engagement to become the steam passage portion, a first heat-sealing step of heat-sealing the entire surface of the region D' that will become the region D; a second heat-sealing step of simultaneously heat-sealing the entire area of ​​the region D' except for a region 39a' that will become the easily peelable seal portion 39a; have This is a method for producing the package for heat treatment 1.

[0010] The present invention provides a step of obtaining a package for heat treatment 1 by a method for producing the package for heat treatment 1 of the present invention; a step of filling the bag body 10 with contents 2 from below; a step of sealing the bottom of the bag body 10 and sealing the inside of the bag body 10; have A method for manufacturing an article.

[0011] The present invention provides A heat sealing method for joining at least two overlapping films by heat sealing to form a band-shaped joining area, comprising: The joining region has a complete seal portion and an easily peelable seal portion having a seal strength lower than that of the complete seal portion, a first heat sealing step of heat-sealing the entire surface of the region E to be the joining region; a second heat-sealing step of simultaneously heat-sealing the entire surface of the region G except for the region F that will be the easily peelable seal portion in the region E; have This is a heat sealing method. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a method for manufacturing a package for heat treatment 1 that can easily manufacture a package for heat treatment that can heat its contents while standing upright, a method for manufacturing an article that can heat its contents while standing upright, and a heat-sealing method that can easily form a complete seal portion and an easily peelable seal portion. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an exploded perspective view showing the configuration of a package for heat treatment 1. [Figure 2] 1A and 1B are plan views showing a package for heat treatment 1, in which (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. FIG. [Figure 4] 1 is a plan view of a package for heat treatment according to a first embodiment, seen from the side where an easily peelable seal portion is provided. FIG. [Figure 5] FIG. 2 is a plan view of the package for heat treatment according to the first embodiment, seen from the opposite side to the side on which the easily peelable seal portion is provided. [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] 1A to 1C are schematic diagrams showing an example of a method for manufacturing the package for heat treatment 1 according to the first embodiment. [Figure 9]1 is a plan view of an article 5 in which contents 2 are filled into a package for heat treatment 1 and sealed, as viewed from the second side sheet 12 side. [Figure 10] This is an enlarged cross-sectional view 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, (a) showing the state in which the bottom sheet 20 is folded into an inverted V shape and sealed, and (b) showing the state in which the seal has been peeled off and the item is standing on its own. [Figure 11] 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 12] FIG. 10 is a plan view of a package for heat treatment according to a second embodiment, seen from the side where an easily peelable seal portion is provided. [Figure 13] FIG. 10 is a plan view of a package for heat treatment according to a second embodiment, seen from the opposite side to the side on which the easily peelable seal portion is provided. [Figure 14] 13 is a schematic cross-sectional view of the zipper seal portion of the package for heat treatment of FIG. 12 taken along line YY. [Figure 15] 10A to 10C are schematic diagrams showing an example of a method for producing a package for heat treatment 1 according to a second embodiment. [Figure 16] 10A to 10C are schematic diagrams showing an example of a method for producing a package for heat treatment 1 according to a second embodiment. [Figure 17] 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 body for heat treatment 1> A first embodiment of a package for heat treatment 1 will be described with reference to the drawings. Fig. 1 is an exploded perspective view showing the configuration of the package for heat treatment 1. Fig. 2(a) is a plan view of the package for heat treatment 1 seen from the first side sheet 11 side, and Fig. 2(b) is a plan view of the package for heat treatment 1 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. The package for heat treatment 1 is ultimately self-standing, and is particularly suitable for use when heat-treating the contents in a microwave oven while it is self-standing, and is even more suitable for use when heat-treating food ingredients.

[0015] The package for heat treatment 1 according to this embodiment has a bag 10 formed by a first side sheet 11 and a second side sheet 12 arranged opposite each other, and is 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 preferably has a bottom sheet 20 that is arranged between a first side sheet 11 and a second side sheet 12 at the bottom of the 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 to stand on its own. In this embodiment, 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 has a zipper seal portion 30 arranged at the top of the bag body 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, 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, 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), a region (bonded region) A that is bonded 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 a region (non-bonded region) B that is not bonded 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 portion 36 that easily peels when the contents 2 in an article 5 (e.g., the article 5 shown in Figures 9 to 11 ) sealed in a heat treatment package 1 and the internal pressure rises due to heat treatment. Region A also includes the easily peelable seal portion 36, and a complete seal portion (joint) 37. By including region B and the easily peelable seal portion 36, when the article 5 expands due to heat treatment, pressure is applied to the easily peelable seal portion 36 beyond region B, allowing the easily peelable seal portion 36 to be opened and the pressure to be released. That is, the easily peelable seal portion 36 functions as a vapor passage portion 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 conventional structure with a jointed seal portion, the number of film parts can be reduced, which prevents the structure of the bag 10 from becoming complicated, even for a self-standing bag 10, and facilitates bag production. A complete seal refers to a seal that has sufficient seal strength to prevent peeling when the internal pressure increases due to heat treatment, and a complete seal portion refers to a seal portion that has such seal strength.

[0036] It is preferable that the easily peelable seal portion 36 has a seal strength weaker than the fitting strength of the joint portion 35, the complete seal portion 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 joint portions and the 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.

[0039] The easily peelable seal portion 36 is preferably provided in the center of the region A as shown in the diagram, but is not limited to this. 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. The height H1 of the easily peelable seal portion 36 in the vertical direction in FIG. 4 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] Next, a method for manufacturing the package for heat treatment 1 according to this embodiment will be described with reference to the drawings. Figure 8 is a schematic diagram showing an example of a method for manufacturing the package for heat treatment 1 according to the first embodiment. The manufacturing method according to this embodiment includes a first heat sealing step of heat-sealing the entire surface of region A', which will become region A described above, and a second heat sealing step of simultaneously heat-sealing the entire surface of region A' except for region 36', which will become easy-peel seal portion 36.

[0044] Specifically, first, as shown in Fig. 8(a), the entire area of ​​region A', which will become region A, is heat-sealed with a strip-shaped seal bar 50 heated by a heater 60 (first heat-sealing step). This step puts the entire area A' into a state where the peeling force is weak (an easily peelable sealed state). The heat sealing conditions in the first heat sealing step are preferably such that a single heat sealing does not result in a complete seal, and more preferably such that a single heat sealing results in an easily peelable seal, and for example, the sealing temperature by the seal bar 50 can be 150 to 300°C (preferably 200 to 250°C) and the sealing time can be 100 to 600 milliseconds (preferably 200 to 400 milliseconds). Note that the first heat sealing step may be repeated within a range where the entire region A' is not completely sealed.

[0045] Next, as shown in FIG. 8(b), the entire area of ​​region 37', excluding region 36' that will become easy-peel seal portion 36, is heat-sealed simultaneously (second heat-sealing step). In this embodiment, seal bar 50 has a non-toothed portion 51 in the portion facing region 36', and this non-toothed portion 51 prevents heat from being transferred from seal bar 50 to region 36', maintaining the easy-peel seal state. This forms easy-peel seal portion 36. Note that region 37' may become completely sealed portion 37 in a single second heat-sealing step, but it is preferable to perform the second heat-sealing step multiple times to form complete seal portion 37. The heat sealing conditions in the second heat sealing step may be appropriately selected based on the conditions under which the region 37' becomes a completely sealed portion 37 through heat sealing. For example, the sealing temperature by the sealing bar 50 may be set to 150 to 300°C (preferably 200 to 250°C), and the sealing time may be set to 100 to 600 milliseconds (preferably 200 to 400 milliseconds).

[0046] Furthermore, in the manufacturing method of the package for heat treatment 1 according to this embodiment, the package for heat treatment 1 may be manufactured by continuously heat-sealing a sheet laminate 70 formed by laminating multiple sheets, each of which is made up of a first side sheet 11, a second side sheet 12, a zipper seal portion 30, and the like, connected horizontally. Specifically, as shown in FIG. 8 , a seal bar 50 is used, which has a heating region capable of full sealing (region (a)) and heating regions with gaps 51 (regions (b) and (c)). The sheet laminate 70 is moved horizontally while a sealing process is performed in each heating region, thereby efficiently and continuously manufacturing the package for heat treatment 1. When the first and second heat-sealing steps are performed consecutively in this manner, it is preferable that the first and second heat-sealing steps be performed under the same heat-sealing conditions.

[0047] According to the manufacturing method of the package for heat treatment 1 of this embodiment as described above, it is possible to easily manufacture a package for heat treatment 1 that is capable of heating the contents in a self-standing state. The manufacturing method of the package for heat treatment 1 as described above is not limited to use in manufacturing the package for heat treatment 1, and can be applied, for example, to a heat sealing method in which at least two overlapping films are joined by heat sealing. Specifically, this heat sealing method joins at least two overlapping films by heat sealing to form a strip-shaped joining region E, where the joining region E has a completely sealed portion and an easily peelable seal portion having a lower seal strength than the completely sealed portion, and includes a first heat sealing step of heat-sealing the entire surface of region E' that will become the joining region, and a second heat sealing step of simultaneously heat-sealing the entire surface of region G of region E except for region F that will become the easily peelable seal portion.

[0048] <Goods> Next, one embodiment of the article 5 manufactured by the present invention will be described with reference to the drawings. FIG. 9 is a view of the article 5, in which the contents 2 are filled into the heat treatment package 1 and sealed, as seen from the side of the second side sheet 12. FIG. 10 is an enlarged cross-sectional view showing the structure of the lower part of the article 5, in which the contents 2 are filled into the heat treatment package 1 and sealed, with FIG. 10(a) showing the bottom sheet 20 folded into an inverted V shape and sealed, and FIG. 10(b) showing the state in which the seal has been peeled off and the article 5 is freestanding. FIG. 11 is a perspective view showing the freestanding article 5, in which the contents 2 are filled into the heat treatment package 1 and sealed. 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.

[0049] As shown in FIG. 11 , the article 5 has the above-described 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 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, and an opening 23 that connects the inside and outside of the bag body 10 is formed below the bag body 10. The contents 2 are filled into the bag body 10 through the opening 23 at the bottom, and as shown in FIG. 10( a), the gap between the outer surface 22a of the second region 22 and the second side sheet 12 is sealed (preferably heat sealed), thereby forming the article 5 with the inside of the bag body 10 sealed. That is, the method for manufacturing the article 5 according to the present invention includes the steps of obtaining the package for heat treatment 1 by the above-described method for manufacturing the package for heat treatment 1, filling the bag body 10 with contents 2 from below, and sealing the bottom of the bag body 10 to hermetically seal the inside of the bag body 10.

[0050] 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 Figure 9, 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 used.

[0051] As shown in FIG. 9, 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.

[0052] 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.

[0053] 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 area 21 and the inner surface 22b of the second area 22, as shown in Fig. 3 or 10. 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 shape of the unsealed area 20x is arbitrary. For example, by applying a line seal at a predetermined height (preferably 3 to 30 mm) from the lower ends of the first area 21 and the second area 22, the unsealed area 20x can be formed below the line seal. Alternatively, the unsealed area 20x can be formed in a rectangular shape (preferably 30 to 80 mm wide x 3 to 30 mm high) at the center of the lower ends of the first area 21 and the second area 22.

[0054] According to the manufacturing method of the present invention as described above, it is possible to easily manufacture an article 5 in which a self-standing package for heat treatment 1 is filled with a content. Furthermore, with 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 even during transportation and sales. Furthermore, 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.

[0055] <Second embodiment of packaging body for heat treatment 1> Next, we will explain a second embodiment of the package for heat treatment 1. Fig. 12 is a plan view of the package for heat treatment 1 according to the second embodiment, seen from the side where the easy peelable seal portion is provided, Fig. 13 is a plan view of the package for heat treatment 1 according to the second embodiment, seen from the opposite side to the side where the easy peelable seal portion is provided, and Fig. 14 is a schematic cross-sectional view of the zipper seal portion of the package for heat treatment 1 shown in Fig. 12, taken along line YY. The following describes the configurations that differ from 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 the first embodiment described above in the configuration of the zipper seal portion 30, but the other configurations are the same as those of the first embodiment described above.

[0056] 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 14. 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.

[0057] 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. 13, the right side in FIG. 14) and the other on the outside side of the bag body 10 (the upper side in FIG. 13, the left side in FIG. 14), to form a joint 35. The joint 35 may also be formed over the entire contact surface 33.

[0058] 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 12, left side in Figure 14) 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 12, right side in Figure 14) of the contact surface 34 that comes into contact with the bag body 10.

[0059] Region C has, in its center, a non-joined portion 38a that is not joined to bag body 10, and a complete sealed portion 38b that is joined to bag body 10. Region D has, in its center, an easily peelable seal portion 39a that is easily peeled when male zipper 31 and female zipper 32 are released from engagement, and a complete sealed portion 39b. It is preferable that length W2 of non-joined portion 38a in a direction parallel to zipper seal portion 30 is 25 to 70 mm, and it is preferable that length W3 of easily peelable seal portion 39a in a direction parallel to zipper seal portion 30 is 20 mm or more. It is sufficient that non-joined portion 38a and easily peelable seal portion 39a are arranged so that non-joined portion 38a and easily peelable seal portion 39a face each other, and they may be located anywhere in region C or region D. However, in consideration of the ease of releasing the zipper engagement, it is preferable that the non-bonding portion 38a and the easily peelable seal portion 39a are provided in the center of the region C and the region D, respectively, as in the illustrated configuration. Furthermore, the number of the non-bonding portion 38a and the easily peelable seal portion 39a is not limited to one each, and two or more of each may be provided.

[0060] 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 38a opens, causing the easy-peel seal portion 39a 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 39a, which has peeled off from the non-bonded portion 38a, serves as a steam outlet (steam passage), preventing an increase in internal pressure. In other words, the easy-peel seal portion 39a functions as a steam passage 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, preventing the bag 10 from becoming complicated, even for a self-standing bag 10, and facilitating bag production. The joints between regions C and D are heat-sealed in the same manner as the joint portion 35 described above.

[0061] The length W2 of the non-bonding portion 38a in the direction parallel to the zipper seal portion 30 is more preferably 30 to 65 mm, and even more preferably 35 to 60 mm.The length W3 of the easily peelable seal portion 39a in the direction parallel to the zipper seal portion 30 is more preferably 20 to 200 mm, and even more preferably 25 to 100 mm.

[0062] The height H2 of the non-bonded portion 38a (region C) in the vertical direction in FIG. 12 is preferably 1 to 7 mm, more preferably 1 to 6 mm, and even more preferably 1 to 5 mm. 12 of the easily peelable seal portion 39a (region D) is preferably 1 to 7 mm, more preferably 1 to 6 mm, and even more preferably 1 to 5 mm, thereby enabling the easily peelable seal portion 39 to be more reliably peeled off when the engagement of the zipper seal portion 30 is released.

[0063] The easily peelable seal portion 39a 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 39a at room temperature is preferably 0.1 to 30 N / 15 mm, and more preferably 0.2 to 25 N / 15 mm.

[0064] The easily peelable seal portion 39a, 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 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 constitutes the zipper seal portion 30. The melting point is a value measured in accordance with JIS K 7121.

[0065] 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.

[0066] 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, when the zipper seal portion 30 is opened, the easily peelable seal portion 39a peels off, suppressing fluctuations in pressure inside the package due to the thermal expansion of water vapor or the internal air. Furthermore, the pressure inside the package can be released through the opened easily peelable seal portion 39a, effectively preventing the package from bursting or the zipper fitting portion of the zipper seal portion 30 from opening. Furthermore, by providing the non-bonded portion 38a and the easily peelable seal portion 39a 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 is not complicated, and bag production is easy.

[0067] Next, a method for manufacturing the package for heat treatment 1 according to this embodiment will be described with reference to the drawings. Figures 15 and 16 are schematic diagrams showing another embodiment of the method for manufacturing the package for heat treatment 1. The package for heat treatment 1 according to this embodiment can be manufactured in the same manner as in the above-described embodiment 1. That is, the manufacturing method of the package for heat treatment 1 according to this embodiment includes a first heat-sealing step of heat-sealing the entire surface of region D', which will become region D, and a second heat-sealing step of simultaneously heat-sealing the entire surface of region D' except for region 39a', which will become easy-peel seal portion 39a.

[0068] 15(a), the entire area of ​​region D', which will become region D, is heat-sealed with a strip-shaped seal bar 50 heated by a heater 60 (first heat-sealing step). This step puts the entire area D' into a state where the peeling force is weak (an easily peelable seal state). As with the first embodiment, the heat sealing conditions in the first heat sealing step are preferably such that a single heat sealing does not result in a complete seal, and more preferably such that a single heat sealing results in an easily peelable seal. For example, the sealing temperature using the sealing bar 50 can be set to 150 to 300°C (preferably 200 to 250°C) and the sealing time can be set to 100 to 600 milliseconds (preferably 200 to 400 milliseconds). Note that the first heat sealing step may be repeated within a range where the entire region D' is not completely sealed.

[0069] Next, as shown in FIG. 15(b), the entire area of ​​region 39b', excluding region 39a' that will become easy-peel seal portion 39a, is heat-sealed simultaneously (second heat-sealing step). In this embodiment, seal bar 50 has a non-serrated portion 51 in the portion facing region 39a'. This non-serrated portion 51 prevents heat from being transferred from seal bar 50 to region 39a', maintaining the easy-peel seal state. This forms easy-peel seal portion 39a. Note that region 39b' may become completely sealed portion 39b in a single second heat-sealing step, but it is preferable to perform the second heat-sealing step multiple times to form complete seal portion 39b. The heat sealing conditions in the second heat sealing step may be appropriately selected based on the conditions under which the region 39b' becomes a completely sealed portion 39b through heat sealing. For example, the sealing temperature by the sealing bar 50 may be set to 150 to 300°C (preferably 200 to 250°C), and the sealing time may be set to 100 to 600 milliseconds (preferably 200 to 400 milliseconds).

[0070] Furthermore, in the manufacturing method of the package for heat treatment 1 according to this embodiment, similar to the first embodiment described above, the package for heat treatment 1 may be manufactured by continuously heat-sealing a sheet laminate 70 formed by laminating sheets, each of which has a first side sheet 11, a second side sheet 12, a zipper seal portion 30, and the like, connected horizontally. Specifically, as shown in FIG. 15 , a sealing bar 50 having a heating region capable of full sealing (region (a)) and heating regions with gaps 51 (regions (b) and (c)) is used to move the sheet laminate 70 horizontally while performing a sealing process in each heating region, thereby efficiently and continuously manufacturing the package for heat treatment 1. Note that when the first heat-sealing step and the second heat-sealing step are performed consecutively in this manner, it is preferable that the first heat-sealing step and the second heat-sealing step be performed under the same heat-sealing conditions.

[0071] Moreover, the region C including the non-bonded portion 38a and the complete seal portion 38b can be formed, for example, as follows. 16, by using a seal bar 50 having a gap 51 provided in the portion facing the non-jointed portion 38a to heat-seal an area C' that should become area C, the portion corresponding to the gap 51 is not sealed and becomes the non-jointed portion 38a, and the sheets are joined together by heat-sealing an area 38b' other than the non-jointed portion 38 of area C'. The completely sealed area 38b may be formed by a single heat-sealing, or may be formed by applying heat-sealing multiple times.

[0072] The heat sealing conditions can be appropriately selected based on the conditions under which the region 38b' becomes a completely sealed portion 38b through heat sealing. For example, if the completely sealed portion 38b is formed by multiple heat sealings, the sealing temperature by the sealing bar 50 can be set to 150 to 300°C (preferably 200 to 250°C), and the sealing time can be set to 100 to 600 milliseconds (preferably 200 to 400 milliseconds). As shown in FIG. 16, similar to the formation of the region D, the region C can be formed continuously using the sheet stack 70.

[0073] According to the manufacturing method of the package for heat treatment 1 of this embodiment as described above, it is possible to easily manufacture a package for heat treatment 1 that is capable of heating the contents in a self-standing state. Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. [Example]

[0074] <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 used 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 and the complete seal portion 37 were formed by one first heat sealing step and two second heat sealing steps (W1 = 20 mm, H1 = 2 mm). The sealing temperature and sealing time of the seal bar 50 in the first heat-sealing step were 250°C and 300 milliseconds, respectively, and the sealing temperature and sealing time of the seal bar 50 in the second heat-sealing step were 250°C and 300 milliseconds. As shown in Fig. 6, the size of the contact surface 34 with the first side sheet 11 was longer toward the inside of the bag body 10 than the contact surface 33 with the second side sheet 12, and a region B (200 mm wide) was formed on the contact surface 34 side.

[0075] <Example 2> A heat treatment package 1' (170 mm long x 200 mm wide x 36 mm deep) was produced as shown in Figure 17. 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 complete seal portion 37 was also provided on the underside of the female zipper 32, and a non-bonded portion 40 (20 mm wide) was formed in the portion facing the easily peelable seal portion 36. The configuration of the male zipper 31 side was the same as in Example 1. The easily peelable seal portion 36 and the completely sealed portion 37 were formed by one first heat sealing step and two second heat sealing steps (W1 = 20 mm, H1 = 2 mm). The sealing temperature by the seal bar 50 in the first heat sealing step was 250°C and the sealing time was 300 milliseconds, and the sealing temperature by the seal bar 50 in the second heat sealing step was 250°C and the sealing time was 300 milliseconds. The packages for heat treatment of Preparation Examples 1 and 2 were both easily produced.

[0076] <Rating 1> 100 g of water was poured into each of the packages for heat treatment in Preparation 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 Preparation Examples 1 and 2 did not break.

[0077] <Rating 2> Three bags of heat treatment packages of each of Preparation 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 between inner surface 21b and inner surface 22b, and then heated in a 600W microwave oven. Thereafter, the state of steam passage was checked, and 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 Preparation Example 2.

[0078] From the above results, it can be seen that in the package for heat treatment 1 of Preparation Example 1, the easily peelable seal portion opens when heat treatment is performed, allowing the internal pressure to escape. Furthermore, the packaging for heat treatment 1 of Preparation Example 1 could be produced more easily than the packaging for heat treatment having a palm-sealed portion.

[0079] <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 12 to 14. 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 39a and the completely sealed area 39b were formed by a single first heat-sealing step and two second heat-sealing steps. The sealing temperature and sealing time of the seal bar 50 in the first heat-sealing step were 250°C and 300 milliseconds, respectively. The sealing temperature and sealing time of the seal bar 50 in the second heat-sealing step were 250°C and 300 milliseconds, respectively. The non-bonded portion 38a and the completely sealed portion 38b were formed by repeating heat sealing three times, as shown in FIG. 16. The sealing temperature and sealing time of each heat-sealing step were 250°C and 300 milliseconds, respectively. The dimensions of the non-bonded portion 38a were W2 = 50 mm and H2 = 2 mm. The dimensions of the easily peelable sealed portion 39a were W3 = 20 mm and H3 = 2 mm.

[0080] <Examples 4-7> A package for heat treatment 1 was produced in the same manner as in Production Example 3, except that the dimensions of the non-bonded portion 38a and the easily peelable seal portion 39a were changed as shown in Table 1. All of the packages for heat treatment of Preparation Examples 3 to 7 above could be easily produced.

[0081] [Table 1]

[0082] <Rating 3> 100 g of water was poured into each of the packages for heat treatment of Preparation 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 of Preparation Examples 3 to 7 was not released.

[0083] <Opening test> The packages for heat treatment of Preparation Examples 3 to 7 were prepared, and when the fastener seal portion 30 was released, it was checked whether the easily peelable seal portion 39a peeled off, and evaluated according to the following criteria. A: The easily peelable seal portion 39a peeled off. B: The zipper was difficult to release, and the easily peelable seal portion 39a was difficult to peel. C: The easily peelable seal portion 39a did not peel off.

[0084] <Steam flow test> Three bags of heat treatment packages for each of Preparation 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 re-inserted. Next, the unsealed region 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.

[0085] 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 easily peelable seal portion 39a is opened, allowing the internal pressure to escape. Furthermore, the packages for heat treatment of Production Examples 3 to 5 could be produced more easily than the packages for heat treatment having a seam-seated portion. [Explanation of symbols]

[0086] 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 Complete seal (joint) 36', 37' area 38a Non-joint part 38b Complete seal part 38b' area 39a Easy-peel seal part 39b Complete seal part 39a', 39b' area 40 Non-joint part 50 Seal Bar 51 Missing teeth 60 Heater 70 Sheet stack A, B, C, D, E areas A', C', D', E' 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 zipper seal portion 30 disposed at the top of the bag body 10; A steam passage for releasing internal steam during heating treatment. and 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 10, 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 portion on the inner side of the bag body 10 toward the outer side of the bag body, The region A is a method for manufacturing a package for heat treatment 1 having an easily peelable seal portion 36 that is easily peeled and becomes the steam passage portion when the contents are heated and the internal pressure increases, a first heat-sealing step of heat-sealing the entire surface of the region A' that will become the region A; a second heat-sealing step of simultaneously heat-sealing the entire surface of the region 37′ except for the region 36′ that will become the easy-peel seal portion 36 in the region A′; have A method for manufacturing a package for heat treatment 1.

2. 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 zipper seal portion 30 disposed at the top of the bag body 10; A steam passage for releasing internal steam during heating treatment. and 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 38a that is not bonded to the bag body, The region D is a manufacturing method of a package for heat treatment 1 having an easily peelable seal portion 39a that is easily peeled off to become the steam passage portion when the male zipper and the female zipper are released from engagement, a first heat-sealing step of heat-sealing the entire surface of the region D' that will become the region D; a second heat-sealing step of simultaneously heat-sealing the entire area of ​​the region D' except for a region 39a' that will become the easily peelable seal portion 39a; have A method for manufacturing a package for heat treatment 1.

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

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

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. A method for producing the package for heat treatment 1 according to claim 1.

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. A method for producing the package for heat treatment 1 according to claim 1.

7. 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 39a in the direction parallel to the zipper seal portion 30 ３ is 20 mm or more A method for producing the package for heat treatment 1 according to claim 2.

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

9. The height H of the easily peelable seal portion 39a ３ is 1 to 7 mm A method for producing the package for heat treatment 1 according to claim 2.

10. The heat seal strength of the easily peelable seal portion 39a at room temperature is 0.1 to 30 N / 15 mm. A method for producing the package for heat treatment 1 according to claim 2.

11. a step of obtaining a package for heat treatment (1) by the method for producing a package for heat treatment (1) according to any one of claims 1 to 10; a step of filling the bag body 10 with contents 2 from below; a step of sealing the bottom of the bag body 10 and sealing the inside of the bag body 10; have A method for manufacturing item 5.

12. A heat sealing method for joining at least two overlapping films by heat sealing to form a band-shaped joining region E, The joining region E has a complete seal portion 37 and an easily peelable seal portion 36 having a seal strength lower than that of the complete seal portion, a first heat-sealing step of heat-sealing the entire surface of the region E' that will become the joining region E; a second heat-sealing step of simultaneously heat-sealing the entire surface of the region G except for a region 36′ that will become the easy-peel seal portion 36 in the region E′; have Heat sealing method.

Images