JP6641651B2 - Pouch - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a pouch made by heat-sealing a laminated film.

  For example, pouches for microwave ovens containing retort foods or frozen foods have been widely used. Usually, a pouch for a microwave oven is produced by heat-sealing the periphery of a laminated film.

  For example, in Patent Literature 1, a ring-shaped point seal is provided on a part of a pouch in order to release steam generated by heating in a microwave oven to the outside of a bag, and a portion surrounded by the point seal is provided. A pouch with a steam vent hole is described. According to the pouch described in Patent Literature 1, when the pressure in the pouch increases due to heating, the ring-shaped point seal peels off, and the accommodation space in the pouch communicates with the vapor vent hole in the ring-shaped point seal. . Thereby, the steam in the pouch can be released from the steam vent hole to the outside. After the heating in the microwave oven, the peripheral seal provided on the peripheral edge of the pouch is picked up, the pouch is opened, and the contents can be taken out.

Japanese Patent No. 4029590

  An object of the present invention is to provide a pouch having a steam release function and excellent usability.

The pouch according to the present invention is a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films.
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner region protruding toward the housing space side, an upper overhang region extending from the upper seal portion , and a lower corner region interposed between the upper overhang region and the lower overhang region. and Chuhari Deryo zone connected to, connected to the upper protruding region and the Chuhari out region, projecting toward the housing space side at a position close to the upper sealing portion than the lower seal portion And the upper corner area ,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to said lower protruding region and the Chuhari Deryo region acute or right angle.
In the pouch according to the present invention, the edge of the lower overhang area on the accommodation space side is linear, and the edge of the middle overhang area connected to the lower corner area on the accommodation space side is linear. The edge of the lower corner area on the housing space side may not be located below the linear portion of the edge of the lower overhang area on the housing space side.
In the pouch according to the present invention, an edge of the first unsealed portion is opposed to an edge of the lower overhanging area on the housing space side and extends linearly, and the middle portion connected to the lower corner area. And a portion extending linearly opposite to the edge of the overhang area on the housing space side.

The pouch according to the present invention is a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films.
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner area protruding toward the housing space side, and an upper overhang area extending from the upper seal portion and connected to the lower corner area,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to a sharp angle and the lower projecting region and before SL on projecting region.
In the pouch according to the present invention, the edge of the lower overhang area on the accommodation space side is linear, and the edge of the upper overhang area connected to the lower corner area on the accommodation space side is linear. The edge of the lower corner area on the housing space side may not be located below the linear portion of the edge of the lower overhang area on the housing space side.
In the pouch according to the present invention, an edge portion of the first unsealed portion is opposed to an edge portion of the lower overhang region on the accommodation space side and extends linearly, and the upper portion connected to the lower corner region. And a portion extending linearly opposite to the edge of the overhang area on the housing space side.

  In the pouch according to the present invention, a portion of the edge portion of the first unsealed portion facing the edge of the lower overhang region on the housing space side is linearly at least up to the lower seal portion. It may extend.

  In the pouch according to the present invention, a portion of the edge portion of the first unsealed portion facing the edge portion of the underhanging region on the accommodation space side may extend linearly up to the opening. Good.

  In the pouch according to the present invention, the contents may be accommodated in the accommodation space, and an upper seal portion may be formed.

The method for manufacturing a pouch according to the present invention is a method for manufacturing a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films.
The pouch is
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner region protruding toward the housing space side, an upper overhang region extending from the upper seal portion , and a lower corner region interposed between the upper overhang region and the lower overhang region. and Chuhari Deryo zone connected to, connected to the upper protruding region and the Chuhari out region, projecting toward the housing space side at a position close to the upper sealing portion than the lower seal portion And the upper corner area ,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to said lower protruding region and the Chuhari Deryo region acute or a right angle,
The manufacturing method comprises:
Providing a laminated film, wherein a plurality of the pouches can be allocated along a lateral direction of the pouches;
Heat sealing the laminated film to form a heat-sealed region on the laminated film, including a region to be the first side seal portion and the second side seal portion. Process and
And a cutting step of cutting a region of the laminated film that is to be the first side seal portion and the second side seal portion.

The method for manufacturing a pouch according to the present invention is a method for manufacturing a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films.
The pouch is
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner area protruding toward the housing space side, and an upper overhang area extending from the upper seal portion and connected to the lower corner area,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to a sharp angle and the lower projecting region and before SL on projecting region,
The manufacturing method comprises:
Providing a laminated film, wherein a plurality of the pouches can be allocated along a lateral direction of the pouches;
Heat sealing the laminated film to form a heat-sealed region on the laminated film, including a region to be the first side seal portion and the second side seal portion. Process and
And a cutting step of cutting a region of the laminated film that is to be the first side seal portion and the second side seal portion.

In the pouch manufacturing method according to the present invention, the pouch has a second unsealed portion that is separated from the accommodation space by the second side seal portion and the stacked laminated film is not heat-sealed,
The heat sealing step, the laminated film,
The heat-sealed area;
The first unsealed portion and the second unsealed portion, which are sandwiched between two heat-sealed regions adjacent in the lateral direction and are to be the accommodation space, and are surrounded by one heat-sealed region. An area that was not heat-sealed, including an area to be sealed,
Divided into
The cutting step includes, in the stacked laminated films, regions to be the first side seal portion and the second side seal portion, and the first unsealed portion and the second unsealed portion. The area to be cut may be cut in a direction intersecting the horizontal direction.

  According to the present invention, it is possible to provide a pouch having a steam release function and excellent usability.

FIG. 1 is a plan view showing an example of a pouch according to one embodiment of the present invention. FIG. 2 is a cross-sectional view showing a layer structure of a laminated film forming a body and a bottom of the pouch shown in FIG. FIG. 3 is an enlarged plan view showing a first unsealed portion of the pouch shown in FIG. FIG. 4 is an enlarged plan view showing a second unsealed portion of the pouch shown in FIG. FIG. 5 is a plan view showing a virtual circle inscribed in the seal portion of the pouch shown in FIG. FIG. 6 is a plan view for explaining dimensions of each component of the pouch shown in FIG. FIG. 7 is a plan view for explaining the method for manufacturing the pouch shown in FIG. FIG. 8 is a plan view showing another example of the shape of the first unsealed portion. FIG. 9 is a plan view showing still another example of the shape of the first unsealed portion. FIG. 10 is a plan view showing still another example of the shape of the first unsealed portion. FIG. 11 is an enlarged plan view showing still another example of the shape of the first side seal portion. FIG. 12 is an enlarged plan view showing still another example of the shape of the first side seal portion. FIG. 13 is a plan view showing a modification of the pouch shown in FIG. FIG. 14 is a plan view showing another modification of the pouch shown in FIG. FIG. 15 is a plan view showing still another modified example of the pouch shown in FIG. FIG. 16 is a plan view illustrating dimensions of the pouch according to the example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale and the size ratio in the vertical and horizontal directions are changed and exaggerated as appropriate for the sake of convenience of illustration and understanding. FIG. 1 is a plan view showing an example of a pouch 1 according to one embodiment of the present invention.

  The pouch 1 shown in FIG. 1 is a standing-type pouch formed by heat-sealing a body portion 10 and a bottom portion 20. As shown in FIG. 1, the body 10 includes a pair of main surface sheets 11 including a front main surface sheet 11a and a back main surface sheet 11b which are arranged to face each other. The vicinity of the side edge 13 of the main surface sheet 11 is heat-sealed to each other. A bottom sheet 21 forming a bottom 20 is disposed between the lower edges 14 of the pair of main sheets 11. The accommodation space 2 for accommodating the contents is defined in a space surrounded by the pair of main surface sheets 11 and the bottom surface sheet 21. The bottom sheet 21 is bent so as to protrude toward the accommodation space 2 side, and the periphery thereof is heat-sealed with the lower part of the main surface sheet 11 overlapping. The bottom sheet 21 retains the shape of the lower ends of the pair of main sheets 11, thereby providing the pouch 1 with autonomy.

  As shown in FIG. 1, in the pouch 1, an opening 4 is formed between the upper edges 12 of the pair of main surface sheets 11, and the contents are filled from the opening 4. In particular, as described below, the pouch 1 of the present embodiment is devised to secure a wide opening 4 so that the contents can be efficiently filled from the opening 4. After the contents are filled, the vicinity of the upper edge 12 where the opening 4 is provided is sealed by heat sealing to obtain the pouch 1.

(Laminated film)
First, a film constituting a pair of main surface sheets 11 forming the body 10 and a bottom sheet 21 forming the bottom 20 will be described. In the present embodiment, the pair of main surface sheet 11 and bottom surface sheet 21 are formed of laminated film 30. FIG. 2 shows a layer configuration of the laminated film 30. As described above, the pouch 1 is formed by heat-sealing the laminated film 30 forming the pair of the main sheet 11 and the bottom sheet 21. For this reason, the laminated film 30 is provided with a sealant layer 34 having a sealing property at a portion on the inner side of the container. In the pouch 1 for a microwave oven, the base material layer 31 serving as a printing base material is provided in a portion on the outer side of the container with respect to the sealant layer 34. Further, the laminated film 30 includes an intermediate layer 33 in order to provide various functions required for a pouch for a microwave oven. Therefore, the laminated film 30 having such a layer configuration is provided with the base material layer 31, the intermediate layer 33, and the sealant from the outer side of the container to the inner side of the container when the pouch 1 is formed. And a layer 34 in this order. Hereinafter, each layer will be described in detail.

  As described above, the pouch 1 for a microwave oven needs to have heat resistance. For this reason, the base material layer 31 of the present embodiment is made of a material having heat resistance. For example, as the substrate layer 31, a stretched polyethylene terephthalate film, a silica-deposited stretched polyethylene terephthalate film, an alumina-deposited stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, or a co-stretched co-stretched polypropylene / ethylene-vinyl alcohol copolymer Alternatively, a composite film obtained by laminating two or more of these films can be used.

  Preferably, the base material layer 31 is biaxially stretched. Thereby, the molecules forming the base material layer 31 are arranged in the stretching direction by the stretching treatment, and the base material layer 31 exhibits excellent dimensional stability. Further, the base layer 31 can be provided with easy-openability by the biaxial stretching process.

  The thickness of such a base material layer 31 is, for example, 10 to 50 μm. In this case, the product cost can be suppressed while satisfying the heat resistance required for the pouch 1. In addition, the base material layer 31 of the present embodiment also functions as the outermost layer of the container when the bag is formed into the pouch 1 in the laminated film 30.

  Further, as shown in FIG. 2, in the present embodiment, a pattern layer 32 including a pattern is laminated on a surface of the base material layer 31 on the inner side of the container. Here, the pattern is a recording object of various modes that can be recorded or printed on the base material layer 31, and is not particularly limited, and includes a figure, a character, a pattern, a pattern, a symbol, a pattern, a mark, and the like. Include widely. In particular, in the laminated film 30 used for the pouch 1 intended to enclose foods, characters indicating information such as a picture of the contents, a product name of the contents, a shelf life, a production date, a production number, etc. are used as a design. Is used. However, the picture layer 32 is laminated on the base layer 31 according to the specification of the product, and the picture layer 32 may not be provided on the base layer 31.

  In the present embodiment, the picture layer 32 is applied to the inner surface of the base layer 31 instead of the outer surface of the base layer 31 on the outer side of the container. In this case, the pattern layer 32 is excellent in abrasion resistance, so that it can be effectively prevented from disappearing due to rubbing and the like, and the pattern can also be effectively prevented from being falsified. Further, when the pouch 1 is formed by bag making, the base layer 31 has transparency so that the picture layer 32 laminated on the inner surface of the base layer 31 can be visually recognized through the base layer 31. Is preferred.

  As described above, the sealant layer 34 is provided so that the two laminated films 30 are overlapped with each other and the vicinity of the opposing edge portion is heat-sealed so that the edge portion is bonded and sealed. Further, in the present embodiment, the sealant layer 34 is disposed on the side of the laminated film 30 that is the innermost container when the bag is formed into the pouch 1.

  As such a sealant layer 34, a heat-resistant film made of a polyolefin-based resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-propylene block copolymer, and an easy peel film can be used. Further, the sealant layer 34 may be formed as a single layer by a film made of these materials, or the sealant layer 34 may be formed as a multilayer by a film made of a plurality of the above materials.

  In particular, when the laminated film 30 is applied to a pouch 1 requiring heat resistance such as a pouch for a microwave oven, the sealant layer 34 mainly includes a non-stretched polypropylene layer (CPP layer) including a non-stretched polypropylene (CPP), Alternatively, it is preferable to have a linear low-density polyethylene layer (LLDPE layer) mainly containing linear low-density polyethylene (LLDPE).

  The thickness of the sealant layer 34 is preferably in the range of 40 μm or more and 200 μm or less. In this case, the pouch 1 is excellent in impact resistance against a drop that may occur in the course of distribution of the pouch 1, and is also excellent in handleability such as easy filling of contents and refilling of contents.

  On the other hand, the intermediate layer 33 laminated between the base material layer 31 and the sealant layer 34 is provided to supplement various functions required for a pouch for a microwave oven. As described above, the pouch 1 is a pouch suitable for including food as a content. For this reason, the intermediate layer 33 prevents the permeation of gas, such as a vapor barrier property for preventing the permeation of water vapor and oxygen gas, so that the contents can be preserved while preventing deterioration such as oxidation of the contents. It may have gas barrier properties. Further, the pouch 1 in the standing pouch format is displayed in a state of being independent on a merchandise shelf at a sales floor. The intermediate layer 33 may have bending resistance and impact resistance so that the pouch 1 can sufficiently withstand an impact when the pouch 1 falls from a product shelf. In addition, the middle layer 33 may have a function of sufficiently increasing concealment so that the contents of the pouch 1 are not visible in order to increase the consumer's willingness to purchase.

  Examples of the intermediate layer 33 having such a function include polyolefins such as polyethylene terephthalate, polyamide, polyethylene, and polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, and saponified ethylene-vinyl acetate copolymer. Or a film coated with polyvinylidene chloride, a film obtained by depositing an inorganic substance such as silicon oxide or aluminum oxide, or a film formed of polyvinylidene chloride or the like. Further, one or more of these base materials may be used in combination.

  As shown in FIG. 2, in the present embodiment, a bonding layer 35 is interposed between the base layer 31 and the intermediate layer 33 and between the intermediate layer 33 and the sealant layer 34. As the bonding layer 35, for example, an adhesive generally used in a dry lamination method known per se can be used. For example, a polyvinyl acetate-based adhesive, a polyacrylate-based adhesive, a cyanoacrylate-based adhesive can be used. For example, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, an amino resin adhesive, an epoxy adhesive, a polyurethane adhesive, or the like can be used.

(Seal part)
The sealing portion 50 is formed by heat-sealing the periphery of the pair of main surface sheet 11 and bottom surface sheet 21 made of such a laminated film 30. When viewed from the direction shown in FIG. 1, the seal portion 50 surrounds the housing space 2 and seals the housing space 2. In addition, the seal portion 50 separates the first unsealed portion 60 and the second unsealed portion 70 located closer to the upper side of the pouch 1 from the accommodation space 2 sealed by the seal portion 50. In the example shown in FIG. 1, the first unsealed portion 60 and the second unsealed portion 70 are portions where the stacked laminated films 30 are not heat-sealed, and are located at positions facing each other with the housing space 2 interposed therebetween. are doing.

  The first unsealed portion 60 is provided to communicate with the accommodating space 2 and release the steam in the pouch 1 to the outside when the pressure in the pouch 1 increases due to steam generated by heating by the microwave oven. ing. The first unsealed portion 60 reaches the side edge 13 of the main surface sheet 11 and is open. That is, the first unsealed portion 60 forms the opening 61 at the side edge 13 of the main surface sheet 11. In particular, the first unsealed portion 60 shown in FIG. 1 protrudes more toward the housing space 2 than the upper seal portion 56 and the lower seal portion 57.

  The second unsealed portion 70 is provided to compensate for the formation of the opening 61 in the side edge 13 of the main surface sheet 11 when the pouch 1 is manufactured, as described later. I have. That is, the second unsealed portion 70 is provided to enhance the manufacturing efficiency of the pouch 1. The second unsealed portion 70 reaches the side edge 13 of the main surface sheet 11 and is open. That is, the second unsealed portion 70 forms the opening 71 at the side edge 13 of the main surface sheet 11. Note that the second unsealed portion 70 does not necessarily have to be provided.

  Now, the seal portion 50 will be further described. As shown in FIG. 1, the outer edge 50 a of the seal portion 50 is formed along the edges 12 to 14 of the main surface sheet 11, the edge of the first unsealed portion 60 or the edge of the second unsealed portion 70. It extends in a shape. On the other hand, the inner edge 50b of the seal portion 50 extends circumferentially at an interval from the outer edge 50a.

  The seal portion 50 of the present embodiment is located opposite to the first side seal portion 51 and the second side seal portion 52 located opposite to the horizontal direction d1, and opposed to the vertical direction d2 orthogonal to the horizontal direction d1. An upper seal portion (a region surrounded by a two-dot chain line in FIG. 1) 53 and a lower seal portion 54 are provided. Each of the side seal portions 51 and 52 is formed by heat sealing the vicinity of the side edge 13 of the pair of main surface sheets 11, and the upper seal portion 53 is formed by heat sealing the vicinity of the upper edge 12 of the pair of main surface sheets 11. The lower seal portion 54 is formed by heat sealing the vicinity of the periphery of the bottom sheet 21 and the vicinity of the lower edge 14 of the main sheet 11. The above-mentioned first unsealed portion 60 and second unsealed portion 70 are isolated from the accommodation space 2 by corresponding side seal portions 51 and 52, respectively.

  FIG. 3 shows an enlarged view of the first side seal portion 51 near the first unsealed portion 60. As shown in FIG. 3, the first side seal portion 51 includes at least one of the upper seal portion 56 and the lower seal portion 57 located on both sides of the first unsealed portion 60, and the first unsealed portion 60. And a projecting portion 55 that is connected to the upper seal portion 56 and the lower seal portion 57 so as to surround the portion, and projects more toward the accommodation space 2 than the upper seal portion 56 and the lower seal portion 57. Contains. The upper seal portion 56 extends along the vertical direction d2 from around the first unsealed portion 60 and is connected to the upper seal portion 53. On the other hand, the lower seal portion 57 extends along the vertical direction d2 from around the first unsealed portion 60 and is connected to the lower seal portion 54.

  As shown in FIG. 3, the overhanging portion 55 includes an upper overhanging region 55c extending from the upper seal portion 56 along the lateral direction d1 and a lower portion extending from the lower seal portion 57 along the lateral direction d1. An overhang region 55d and a middle overhang region 55e interposed between the upper overhang region 55c and the lower overhang region 55d are included. In the example illustrated in FIG. 3, the overhang region 55 e extends along the up-down direction d <b> 2 at a position between the first unsealed portion 60 and the storage space 2. The overhang region 55e is connected to the overhang region 55c via the upper corner region 55f, and is connected to the lower overhang region 55d via the lower corner region 55g.

  The upper corner area 55f protrudes toward the accommodation space 2 at a position closer to the upper seal part 56 than the lower seal part 57, and the lower corner area 55g is lower than the upper seal part 56. And protrudes toward the accommodation space 2 side at a position close to. The lower corner region 55g of the projecting portion 55 projecting toward the storage space 2 functions to stably start peeling from the projecting portion 55 when heated in a microwave oven. In the example illustrated in FIG. 3, the upper corner area 55f and the lower corner area 55g have a sector shape with a central angle of 90 ° in plan view. The plan view refers to viewing the pouch 1 from a direction orthogonal to both the horizontal direction d1 and the vertical direction d2.

  Further, in the present embodiment, the middle overhang region 55e of the overhang portion 55 forms a step S1 with the upper seal portion 56. Therefore, the inner edge 55b of the overhang portion 55 is located closer to the accommodation space 2 than the inner edge 56b of the upper seal portion 56. Further, the middle overhang region 55 e of the overhang portion 55 forms a step S 2 with the lower seal portion 57. In the example shown in FIG. 3, the size of the step S2 formed by the inner edge 55b of the overhang region 55e with respect to the inner edge 57b of the lower seal portion 57 is 3 mm or more.

  In particular, a first notch 7a, which can be a starting point for unsealing, is formed in the upper seal portion 56. That is, the position where the first notch 7a is provided is the opening scheduled position CP1 when the body 10 is opened to take out the contents accommodated in the accommodation space 2. The first notch 7a shown in FIG. 3 penetrates the main surface sheet 11 forming the body portion 10. The first notch 7a may be a cut formed in the upper seal portion 56, or may be a notch having a predetermined width. Since the first notch 7a is formed in the upper seal portion 56, the body 10 can be easily opened from the first notch 7a.

  FIG. 4 shows an enlarged view of the second side seal portion 52 near the second unsealed portion 70. As shown in FIG. 4, the second side seal portion 52 includes a second upper seal portion 58 relatively located closer to the upper edge 12 and a second lower seal portion relatively located closer to the lower edge 14. 59. The inner edge 58b of the second upper seal portion 58 is located closer to the storage space 2 than the inner edge 59b of the second lower seal portion 59. Therefore, a step S3 is formed between the inner edge 58b of the second upper seal portion 58 and the inner edge 59b of the second lower seal portion 59. In the example shown in FIG. 4, the step S3 is located near the second unsealed portion 70.

  In particular, the second upper seal portion 58 is formed with a second notch 7b that can be a starting point for opening. That is, the position where the second notch 7b is provided is another opening position CP2 when the body portion 10 is opened to take out the contents accommodated in the accommodation space 2. The second notch 7b shown in FIG. 4 penetrates the main surface sheet 11 forming the body portion 10. The second notch 7b may be a cut formed in the second upper seal portion 58, or may be a notch having a predetermined width. Since the second notch 7b is formed in the second upper seal portion 58, the opening of the body 10 can be easily started from the second notch 7b.

  Note that the opening positions CP1 and CP2 are not limited to the notches 7a and 7b, and various easy-opening means known per se can be provided. As another example of the easy opening means, there is an example in which a plurality of small holes are provided in the upper seal portion 56 or the second upper seal portion 58. By providing a plurality of fine small holes in the upper seal portion 56 or the second upper seal portion 58, easy-openability can be imparted.

  Now, as described above, the main sheet 11 and the bottom sheet 21 are formed of the same laminated film 30. Therefore, when heat-sealing the vicinity of the periphery of the stacked laminated films 30 under the same heat-sealing condition, the bonding force at any one point in the sealing portion 50 becomes equal to the bonding force at another point. Therefore, the ease with which the seal portion 50 can be peeled off when the pressure in the pouch 1 increases with heating largely depends on the stress concentration induced due to the position and shape of the seal portion 50.

  In this regard, in the present embodiment, the separation of the pair of main surface sheets 11 from the overhang portion 55 progresses during heating by the microwave oven, and it is intended that the accommodation space 2 and the first unsealed portion 60 communicate with each other. I have. And in order to make it easy to peel off a pair of main surface sheets 11 from the overhang portion 55, the overhang portion 55 overhangs the housing space 2 side from the other portions 56 and 57 of the first side seal portion 51, In addition, the lower corner area 55g is included. According to the present inventors' earnest studies, in order to more stably realize the progress of peeling of the pair of main surface sheets 11 from the overhang portion 55, in FIG. The relationship indicating that a1 which is the length of the overlapping area with the protruding portion 55 is shorter than a2 which is the length of the overlapping area of the second imaginary straight line IL2 and the second side seal portion 52 is satisfied. Was found to be preferable. FIG. 5 is a diagram for explaining the starting point of the peeling of the seal portion 50, and shows the pouch 1 as a plan view. In addition, a1 which is the length of the range where the first virtual straight line IL1 and the overhanging portion 55 overlap, and a2 which is the length of the range where the second virtual straight line IL2 and the second side seal portion 52 overlap each other are as follows. This will be described in detail later.

  As shown in FIG. 5, the accommodation space 2 that expands with heating can be considered to expand from the center O located near the center of the pouch 1. Therefore, each position of the seal portion 50 receives a strong load in the direction from the center O to each position due to the heating. That is, the pressure applied to the seal portion 50 due to the heating strongly depends on the positional relationship with the center O. First, a method of specifying the reference point O will be described.

  As a premise, as described above, the accommodation space 2 is defined in a space surrounded by the pair of main surface sheets 11 and the bottom surface sheet 21. Therefore, the outer edge of the housing space 2 is defined as a boundary between the pair of main surface sheets 11 and the bottom sheet 21 and the surfaces on the housing space 2 side. Therefore, in plan view, the outer edge of the housing space 2 is formed by an upper edge 2 a defined at a boundary with the upper seal portion 53 to which the pair of main surface sheets 11 are joined, and a side seal to which the pair of main surface sheets 11 are joined. The lower edge 2c is defined by the side edge 2b defined at the boundary between the parts 51 and 52, and the upper seal part 53 joining the one main surface sheet 11 and the bottom sheet 21. I have. In particular, a point at the center of the upper edge 2a of the accommodation space 2 is defined as an upper middle point Y1, and a point at the center of the lower edge 2c of the accommodation space 2 is defined as a lower middle point Y2. That is, the upper middle point Y1 is a position that is the center of both ends 2a1 and 2a2 of the upper edge 2a of the housing space 2, and the lower middle point Y2 is both ends 2c1 and 2c2 of the lower edge 2c of the housing space 2. Is the center position.

  First, in a plan view, a virtual circle C having a center at a position between the upper middle point Y1 and the lower middle point Y2 is drawn. The center of the virtual circle C is the center O described above.

  Next, a first imaginary straight line IL1 which is the shortest distance from the center O of the imaginary circle C to the first unsealed portion 60 is drawn, and the length of the overlapping area of the first imaginary straight line IL1 and the overhang portion 55 is represented by a1. I do. In addition, a second imaginary straight line IL2 that is the shortest distance from the center O of the imaginary circle C to the second unsealed portion 70 is drawn, and the length of the overlapping range of the second imaginary straight line IL2 and the second side seal portion 52 is determined. a2. The present inventors have conducted extensive studies and found that, when the relationship of a1 <a2 is satisfied, the separation of the pair of main surface sheets 11 from the overhang portion 55 proceeds more stably.

  When the relationship a1 <a2 is satisfied, the following factors are presumed as factors that cause the separation of the pair of main surface sheets 11 from the overhang portion 55 to proceed more stably. However, the present invention is not limited to the following estimation.

  As described above, each position of the seal portion 50 receives a load in the direction from the center O to each position with the heating. For this reason, in the range where the first virtual straight line IL1 which is the shortest straight line drawn from the center O to the first unsealed portion 60 and the overhanging portion 55 overlap, a load in the direction toward the first unsealed portion 60 is strongly received. . Similarly, in a range where the second virtual straight line IL2, which is the shortest straight line drawn from the center O to the second unsealed portion 70, and the second side seal portion 52 overlap, the load in the direction toward the second unsealed portion 70 is provided. Receive strongly. Therefore, when the length a1 of the overlapping range of the overhang portion 55 and the first virtual straight line IL1 is shorter than the length a2 of the overlapping range of the second side seal portion 52 and the second virtual straight line IL2, The portion 55 has less seal margin to withstand the load. For this reason, the projecting portion 55 has a lower resistance to the load of the vapor pressure than the second side seal portion 52, and the housing space 2 and the second unsealed portion 70 communicate with each other before the communication between the housing space 2 and the second unsealed portion 70. It is considered that since the one unsealed portion 60 communicates, the vapor can be stably released from the overhang portion 55. It is also considered that the peeling from the seal portion 50 other than the overhang portion 55 can be easily suppressed from progressing. In other words, it is considered that the progress of the seal retreat from the seal portion 50 other than the overhang portion 55 can be easily suppressed.

  In particular, in the example shown in FIG. 5, the first virtual straight line IL1 overlaps the overhang portion 55 in the lower corner region 55g.

  The shortest distance b1 from the center O in the direction along the first virtual straight line IL1 to the overhang portion 55 is the shortest distance from the center O in the direction along the second virtual straight line IL2 to the second side seal portion 52. It is preferable to be shorter than b2. In this case, a load can be efficiently applied to the overhang portion 55, and the housing space 2 and the first unsealed portion 60 communicate with each other before the housing space 2 and the second unsealed portion 70 communicate with each other. It is considered that steam can be stably released from the overhang portion 55. It is also considered that the peeling from the seal portion 50 other than the overhang portion 55 can be easily suppressed from progressing.

  Next, the relationship between the size and size of each part will be described with reference to FIG. FIG. 6 is a plan view showing dimensions of each component of the pouch 1 shown in FIG.

  As shown in FIG. 6, the width W1 of the upper seal portion 56 is wider than the width W2 of the lower seal portion 57. In the present specification, the width of the seal portion 50 refers to a length W in a direction orthogonal to a direction in which the seal portion 50 extends at each position X on the inner edge 50b. As an example, the width W1 of the upper seal portion 56 is a length in a direction orthogonal to a direction in which the upper seal portion 56 extends at each position on the inner edge of the upper seal portion 56. At each position on the inner edge of the upper seal portion 56, if the length in the direction orthogonal to the extending direction of the upper seal portion 56 at that position is not constant, the width W1 of the upper seal portion 56 is set as the width W1 of the upper seal portion 56. In each position on the inner edge of the uppermost portion, the largest value among the lengths in the direction orthogonal to the direction in which the upper seal portion 56 extends at that position is adopted.

  Further, the width W3 of the overhang portion 55 is smaller than the width W1 of the upper seal portion 56 and the width W2 of the lower seal portion 57. In addition, the width W3 of the overhang portion 55 is smaller than the width W6 of the portion of the second side seal portion 52 located between the second unsealed portion 70 and the accommodation space 2. As an example, the width W1 of the upper seal portion 56 is set to, for example, 8 to 15 mm, the width W2 of the lower seal portion 57 is set to, for example, 5 to 8 mm, and the width W3 of the overhang portion 55 is set to, for example, 2. It is set to 5-5 mm.

  Further, in the vertical direction d2, the length L1 of the upper seal portion 56 is shorter than the length L2 of the lower seal portion 57. On the other hand, the length L3 of the overhang portion 55 is shorter than the length L1 of the upper seal portion 56 and the length L2 of the lower seal portion 57.

  The length L4 of the first unsealed portion 60 in the horizontal direction d1 is longer than the length L5 of the second unsealed portion 70 in the horizontal direction d1. On the other hand, the length L6 of the first unsealed portion 60 in the vertical direction d2 is equal to the length L7 of the second unsealed portion 70 in the vertical direction d2. As an example, the length L4 of the first unsealed portion 60 in the horizontal direction d1 is set to 3 to 15 mm, and the length L5 of the second unsealed portion 70 in the horizontal direction d1 is set to, for example, 1 to 3 mm. The length L6 of the first unsealed portion 60 in the vertical direction d2 and the length L7 of the second unsealed portion 70 in the vertical direction d2 are set to, for example, 4 to 15 mm.

  The width W4 of the second upper seal portion 58 is wider than the width W5 of the second lower seal portion 59. As an example, the width W4 of the second upper seal portion 58 is set to, for example, 8 to 15 mm, and the width W5 of the second lower seal portion 59 is set to, for example, 5 to 8 mm.

  Further, the size of the step S2 is set to, for example, 3 to 15 mm, preferably 7 to 12 mm. More specifically, the distance S2 in the horizontal direction d1 between the portion z1 of the overhanging portion 55 located closest to the storage space 2 and the portion z2 of the lower seal portion 57 located closest to the storage space 2 is 3 m or more and 15 mm or less.

  However, the dimensions and the size relationship of the components constituting the pouch 1 are merely examples, and can be changed as appropriate according to the specifications.

  The pouch 1 shown in FIG. 1 is a pouch having a longitudinal direction in a vertical direction d2 and a lateral direction in a lateral direction d1. However, a pouch having a size that is widespread in the market may have a longitudinal direction in the horizontal direction d1 and a short direction in the vertical direction d2.

  Next, the operation of the present embodiment having the above configuration will be described.

  When the pouch 1 is placed in a microwave oven and warmed, the radio frequency radiated from the microwave oven warms the water contained in the content and heats the content. The water contained in the contents evaporates with the heating, and the pressure in the pouch increases. In the present embodiment, the projecting portion 55 projects beyond the other portions 56 and 57 of the first side seal portion 51 toward the housing space 2 and includes a lower corner region 55g. For this reason, when the pressure in the pouch is increased, the separation of the pair of main surface sheets 11 from the overhang portion 55 is started. When the extension of the overhang portion 55 progresses and the housing space 2 and the first unsealed portion 60 are connected, the vapor in the pouch 1 can be released from the first unsealed portion 60 to the outside.

  After heating in the microwave oven, portions of the body 10 that have been exposed to steam, such as portions other than the portion where the seal portion 50 is formed, have become hot. On the other hand, the seal portion 50 is not easily heated. Particularly, according to the present embodiment, width W1 of upper seal portion 56 is wider than width W2 of lower seal portion 57. Therefore, the upper seal portion 56 is wider than the lower seal portion 57 in a portion not heated. Therefore, even if the upper seal portion 56 is pinched with a finger, it is less likely to feel the heat than to pinch the lower seal portion 57 with a finger. Therefore, the upper seal portion 56 is pinched by a finger at a position above the first scheduled opening position CP1, and the body 10 is opened from the first notch 7a provided in the upper seal portion 56. Thereby, the content stored in the storage space 2 can be taken out while suppressing the feeling of excessive heat.

  Next, a method of manufacturing the pouch 1 shown in FIG. 1 will be described with reference to FIG. FIG. 7 is a plan view for explaining a method for manufacturing the pouch 1 shown in FIG.

  As shown in FIG. 7, first, a body material sheet 110 that forms the body portion 10 and a bottom material sheet 120 that forms the bottom portion 20 are arranged at predetermined positions. A region (except for the upper seal portion 53) of each of the plurality of pouches 1 to be formed into a seal portion 50 is heat-sealed. At this time, the area of the body sheet 110 that has not been heat-sealed is divided into an area 111 that is to be the accommodation space 2 of each pouch 1 and an area 112 that is to be the first unsealed portion 60. 113. After that, a plurality of pouches 1 are manufactured by cutting the heat-sealed region 113 according to the shape of each pouch 1. The pouch 1 is filled with the contents from the opening 4 formed between the upper edges 12 of the pair of main surface sheets 11 of the obtained pouch 1 and heat-sealed near the upper edge 12 where the opening 4 is provided. Seal.

  In this manufacturing method, when the region 112 to be the first unsealed portion 60 that is not heat-sealed is formed to have the same size as the first unsealed portion 60, cutting between the adjacent pouches 1 due to processing accuracy. If the position is shifted, the opening 61 of the first unsealed portion 60 may be closed by the heat-sealed region 113. Therefore, in the present embodiment, the length of the region 112 to be the first unsealed portion 60 in the horizontal direction d1 is made larger than the length of the first unsealed portion 60 in the horizontal direction d1. For this reason, when cutting according to the shape of each pouch 1, a part of the region 112 to be the first unsealed portion 60 of one pouch 1 defines the second unsealed portion 70 of the adjacent pouch 1. That is, since the pouch 1 is provided with the second unsealed portion 70, even if the cutting position between the adjacent pouches 1 is shifted due to processing accuracy, the first unsealed portion 70 of the pouch 1 is formed. The opening 61 of the seal portion 60 can be prevented from being closed, and the pouch 1 can be manufactured continuously.

  As described above, according to the present embodiment, the side sealing portion 51 in which the stacked laminated films 30 are heat-sealed, and the side sealing portion 51 are isolated from the housing space 2 and are closer to the upper side of the pouch 1. And the unsealed portion 60 is located at the side edge 13 of the stacked laminated film 30 to form an opening 61, and the side sealed portion 51 is formed of a first unsealed portion. The upper seal portion 56 and the lower seal portion 57 located on both sides of the portion 60, and are connected to the upper seal portion 56 and the lower seal portion 57 so as to surround at least a part of the unsealed portion 60, and And an overhanging portion 55 projecting toward the storage space 2 side of the upper seal portion 56 and the lower seal portion 57. The overhang portion 55 is formed on the lower seal portion 57 more than the upper seal portion 56. Nearby The position, including the corner regions 55g protruding toward the accommodation space 2 side, width W2 of the lower sealing portion 57 is narrower than the width W1 of the upper seal portion 56.

  According to such a configuration, since the width W2 of the lower seal portion 57 is smaller than the width W1 of the upper seal portion 56, after heating in the microwave oven, the upper seal portion 56 becomes lower. A portion that is not heated is wider than the side seal portion 57. Therefore, when the pouch is opened by pinching the upper seal portion 56 with a finger, it is possible to suppress the user from feeling excessive heat. Further, since the width W2 of the lower seal portion 57 is smaller than the width W1 of the upper seal portion 56, the width W2 of the lower seal portion 57 is equal to the width W1 of the upper seal portion 56. Thus, the accommodation space 2 can be widely secured.

  Further, since the projecting portion 55 projects toward the accommodation space 2 side from the upper seal portion 56 and the lower seal portion 57, when the pressure in the pouch 1 increases due to heating by the microwave oven, Stress is likely to be concentratedly applied to the overhang portion 55. For this reason, the peeling can be started stably from the overhang portion 55, and the vapor in the pouch 1 can be reliably released from the first unsealed portion 60. In addition, since the peeling easily progresses from the overhanging portion 55, on the other hand, the progression of the peeling from the seal portion 50 other than the overhanging portion 55 can be suppressed.

  In addition, after heating in the microwave oven, the area around the accommodating space 2 of the pouch 1 becomes hot and is difficult to handle by hand. For this reason, when taking out the heated pouch 1 from the microwave oven and carrying it, there is a case where the pouch 1 is unintentionally tilted due to difficulty in handling. In this regard, according to the present embodiment, the first unsealed portion 60 extending from the side edge 13 of the main surface sheet 11 projects more toward the housing space 2 than the upper seal portion 56 and the lower seal portion 57. I have. That is, according to the pouch 1 according to the present embodiment, it is possible to prevent the contents from leaking out of the pouch 1 from the opening 61 of the first unsealed portion 60 after heating in the microwave oven.

  Further, since there is no need to form a steam vent hole as in the pouch described in Patent Document 1, there is no problem of inspection and collection of scraps which may occur when the steam vent hole is formed. From the above, according to the pouch 1 of the present embodiment, in addition to being able to efficiently fill the contents, it is also possible to manufacture efficiently.

  Further, according to the present embodiment, width W3 of overhang portion 55 is smaller than width W2 of lower seal portion 57. In this case, this contributes to making the projecting portion 55 easier to peel off than the lower seal portion 57. As a result, the progress of peeling from the seal portion 50 other than the overhang portion 55 can be easily suppressed.

  Further, according to the present embodiment, the lateral direction between the portion z1 of the protruding portion 55 located closest to the storage space 2 and the portion z2 of the lower seal portion 57 located closest to the storage space 2 The distance S2 of d1 is 3 m or more and 15 mm or less. In this case, when the pressure in the pouch 1 increases, stress tends to concentrate on the protruding portion 55 protruding from the opening 61 toward the housing space 2. Thereby, it is possible to easily suppress the peeling from progressing from the seal portion 50 other than the overhang portion 55.

  Further, according to the present embodiment, width W1 of upper seal portion 56 is 8 mm or more and 15 mm or less. When the width W1 of the upper seal portion 56 is 8 mm or more, after heating in the microwave oven, the upper seal portion 56 can be pinched with a finger without feeling excessive heat. On the other hand, when the width W1 of the upper seal portion 56 is equal to or less than 15 mm, a large accommodation space 2 for accommodating the contents can be secured by using the laminated film 30 having a limited size.

  Further, according to the present embodiment, projecting portion 55 includes a further upper corner region 55f protruding toward accommodation space 2 at a position closer to upper seal portion 56 than lower seal portion 57. In. In this case, since the step S1 is formed between the overhang portion 55 and the upper seal portion 56, the overhang portion 55 is easily adjacent to the accommodation space 2 in a wide range. For this reason, the area where the projecting portion 55 is peeled off can be increased, and the steam can be released in a state where the pressure in the pouch 1 does not become too high, so that the safety is excellent.

  Further, according to the present embodiment, first virtual straight line IL1 overlaps overhang portion 55 in lower corner region 55g. According to such an embodiment, as the distance from the center O of the virtual circle C increases, the width of the overhang portion 55 in the direction in which the first virtual straight line IL1 extends gradually increases, so that the overhang portion 55 is easily peeled. Thus, it is possible to easily suppress the progress of the peeling from the seal portion 50 other than the overhang portion 55.

  Further, according to the present embodiment, the second side seal portion 52 located opposite to the first side seal portion 51 in the lateral direction d1 and the second side seal portion 52 are separated from the housing space 2. A second unsealed portion 70 having an opening 71 formed at an edge of the stacked laminated film 30. The first unsealed portion 60 and the second unsealed portion 70 It is located facing the direction d1. In this case, even if the cutting position between adjacent pouches 1 is shifted due to processing accuracy in the manufacturing process of the pouch 1, the opening 61 of the first unsealed portion 60 of another pouch 1 is closed. It is possible to prevent peeling.

  According to the present embodiment, the length L6 of the first unsealed portion 60 in the up-down direction d2 is equal to the length L7 of the second unsealed portion 70 in the up-down direction d2 in plan view. In this case, in the manufacturing process, when the adjacent pouch 1 is cut in a state where the first unsealed portion 60 of one adjacent pouch 1 is connected to the second unsealed portion 70 of the other pouch 1, The desired shape of the first unsealed portion 60 of one pouch 1 and the second unsealed portion 70 of the other pouch 1 even if the cut position between adjacent pouches 1 is shifted due to accuracy. Can be maintained. For this reason, the tolerance of the manufacturing error of the pouch 1 can be increased, and as a result, it contributes to manufacturing the pouch 1 efficiently.

  Here, from the viewpoint of more reliably peeling from the overhanging portion 55, the seal strength in the pair of main surface sheets 11 at the overhanging portion 55 is preferably 50 N / 15 mm or less at 100 ° C. . In this case, when the pressure in the pouch 1 increases due to heating by the microwave oven, the possibility that the pouch 1 breaks can be reduced. The sealing strength between the pair of main surface sheets 11 at the projecting portion 55 of the present embodiment is 35 N / 15 mm or less at 100 ° C. In this case, when the pressure in the pouch 1 increases due to the heating by the microwave oven, the peeling is surely started from the overhanging portion 55 and the vapor in the pouch 1 is surely released from the first unsealed portion 60. be able to. Preferably, the seal strength in the pair of main surface sheets 11 at the overhang portion 55 is 30 N / 15 mm or less at 100 ° C. Here, the term “seal strength” refers to a value (N / 15 mm) of the seal strength measured in accordance with JISZ0238. If the width of the sample piece cannot be secured to 15 mm, a sample piece having a width smaller than 15 mm is sampled, the sealing strength is measured, and the obtained value is calculated as (15 mm / width of sample piece mm mm). ) Is adopted as the seal strength value (N / 15 mm).

  Next, the shape of the first unsealed portion 60 will be described in detail. As shown in FIG. 3, the edge portion 62 of the first unsealed portion 60 includes a first edge portion 63 and a second edge portion 64 extending from the periphery of the opening 61 toward the accommodation space 2, and a first edge portion 63. And a third edge 65 extending between the tip of the second edge 64 and the tip of the second edge 64. In the illustrated example, the first edge 63 is disposed on the upper edge 12 side of the main surface sheet 11, and the second edge 64 is disposed on the lower edge 14 side of the main surface sheet 11.

  As shown in FIG. 3, the first edge 63 and the second edge 64 of the first unsealed portion 60 extend linearly in the lateral direction d1. In addition, the length of the first edge 63 is equal to the length of the second edge 64. Therefore, when the third edge 65 extends linearly between the tip of the first edge 63 and the tip of the second edge 64, the third edge 65 extends parallel to the up-down direction d2, It is orthogonal to the first edge 63 and the second edge 64. In this case, the edge portion 62 of the first unsealed portion 60 extends along a substantially U-shape. In the present embodiment, the length of the third edge portion 65, that is, the length L6 of the first unsealed portion 60 in the vertical direction d2 is shorter than the length of the first edge portion 63 and the length of the second edge portion 64. .

  By the way, it is conceivable to form the edge portion 62 of the first unsealed portion 60 so as to extend along a substantially V-shaped shape. In other words, the edge portion 62 of the first unsealed portion 60 includes only the first edge portion 63 and the second edge portion 64 extending from the periphery of the opening 61 toward the housing space 2, and the tip of the first edge portion 63 A configuration in which the tip of the second edge portion 64 is overlapped with the tip of the second edge portion 64 is also considered. FIG. 8 shows such an example.

  Note that the shape of the first unsealed portion 60 is not limited to the examples shown in FIGS. 9 and 10 show another example of the shape of the first unsealed portion 60. FIG. Of these, in the example shown in FIG. 9, the first unsealed portion 60 has a trapezoidal shape in plan view. Specifically, the length of the first edge 63 extending linearly in the lateral direction d1 is shorter than the length of the second edge 64 extending linearly in the lateral direction d1. Therefore, the third edge 65 is inclined such that the end connected to the first edge 63 is located on the side separated from the housing space 2 in the lateral direction d1 than the end connected to the second edge 64. are doing.

  In the example illustrated in FIG. 10, the first unsealed portion 60 has a parallelogram shape in plan view. Specifically, the first edge portion 63 and the second edge portion 64 extend straight from the opening 61 in an inclined manner with respect to the horizontal direction d1. The length of the first edge 63 is equal to the length of the second edge 64. Therefore, the third edge 65 extends between the tip of the first edge 63 and the tip of the second edge 64 in parallel in the up-down direction d2.

≪Modified example≫
Note that various changes can be made to the above-described embodiment. Hereinafter, an example of a modification will be described with reference to the drawings. In the following description and the drawings used in the following description, portions that can be configured in the same manner as in the above-described embodiment will use the same reference numerals as those used for corresponding portions in the above-described embodiment, A duplicate description will be omitted.

  The form of the first side seal portion 51 in the above-described embodiment is an example, and various changes can be made. 11 to 13 show other examples of the form of the first side seal portion 51. FIG. In the example shown in FIG. 11, the width W <b> 1 becomes narrower as the upper seal portion 56 approaches the overhanging portion 55. In the example shown in FIG. 12, the overhanging portion 55 extends from the upper seal portion 56 in a downwardly inclined manner with respect to the lateral direction d1 and extends along the lateral direction d1 from the lower seal portion 57. The upper overhanging area 55c is connected to the lower overhanging area 55d via a lower corner area 55g. The lower corner region 55g protrudes toward the accommodation space 2 at a position closer to the lower seal portion 57 than the upper seal portion 56.

  Further, in the above-described embodiment, as shown in FIG. 1, an example is shown in which the pouch 1 is formed of a standing-type pouch formed by heat-sealing the body portion 10 and the bottom portion 20. Is not limited to such an example. The pouch may be a flat pouch, a three-sided seal type, a pillow type, or a gusset type pouch. 13 to 15 show other examples of the pouch 1.

  Of these, the example shown in FIG. 13 is a so-called four-sided seal flat pouch 1. The four-sided seal flat pouch 1 shown in FIG. 13 is made from only a pair of main surface sheets 11 and does not use the bottom surface sheet 21. Therefore, the lower seal portion 54 is formed by heat sealing the lower edges 14 of the pair of main surface sheets 11.

  On the other hand, the example shown in FIGS. 14 and 15 is a so-called three-sided seal flat pouch 1. The three-sided flat pouch 1 shown in FIGS. 14 and 15 is manufactured by folding a single main surface sheet 11 and heat-sealing overlapping edges. In the example shown in FIG. 14, the lower end of the pouch 1 is formed as a fold obtained by folding the single main surface sheet 11, and the lower seal portion 54 is not formed. On the other hand, in the example shown in FIG. 15, the side end of the pouch 1 is formed as a fold obtained by folding the single main surface sheet 11, and the second side seal portion 52 is not formed. The lower seal portion 54 may be formed in the example shown in FIG. 14, or the second side seal portion 52 may be formed in the example shown in FIG.

(One embodiment of the present invention)
Hereinafter, an embodiment of the present invention will be described. First, problems to be solved by the following embodiment of the present invention will be described.

  In order to secure a large accommodation space for accommodating contents by using a laminated film of a limited size, it is effective to reduce the width of a peripheral seal provided on the periphery of the pouch. However, when the width of the peripheral seal of the pouch is reduced, the peripheral seal becomes hot after heating in the microwave oven, and it is necessary to leave the peripheral seal cool until it cools. For this reason, the pouch cannot be quickly opened after heating in a microwave oven.

  One embodiment of the present invention has been made in view of the above points, and has an object to provide a pouch having a steam release function, capable of efficiently filling contents, and having excellent usability. Aim.

  In the pouch described in Patent Literature 1, a ring-shaped point seal is provided at a position inward of the peripheral seal of the pouch, so that the opening for filling the contents into the pouch is narrowed. In addition, the ring-shaped point seal needs a certain size in order to absorb the variation in the position of the steam vent hole, and the opening for filling the contents into the pouch is increasingly narrowed. As a result, the pouch described in Patent Literature 1 has a problem that a wide frontage for filling contents into the pouch cannot be ensured, and the contents cannot be efficiently filled.

  In addition, in the pouch described in Patent Literature 1, it is necessary to inspect whether or not the steam vent hole is reliably opened at a predetermined position surrounded by a ring-shaped point seal. In addition, it is necessary to surely collect the scrap generated when the steam vent hole is opened so as not to impair the merchantability. As a result, it is difficult to efficiently manufacture the pouch described in Patent Document 1.

  Therefore, it would be even more convenient if the pouch according to one embodiment of the present invention could even be manufactured efficiently.

  Subsequently, means for solving the problem in one embodiment of the present invention will be described.

  A pouch according to an embodiment of the present invention is a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films, and a side portion where the stacked laminated films are heat-sealed. A seal portion, and an unsealed portion that is separated from the housing space by the side seal portion and the stacked laminated film is not heat-sealed, and the unsealed portion is located closer to an upper side of the pouch; The side seal portion is open to the side edge of the stacked laminated film, and the side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion. The lower seal portion is connected to the upper seal portion and the lower seal portion so as to surround at least a part of a seal portion, and is directed to the storage space side with respect to the lower seal portion. And an overhanging portion, wherein the overhanging portion includes a corner area protruding toward the housing space side at a position closer to the lower seal portion than the upper seal portion, and The width of the side seal portion is smaller than the width of the upper seal portion.

  In the pouch according to one embodiment of the present invention, the width of the overhang portion may be smaller than the width of the lower seal portion.

  In the pouch according to one embodiment of the present invention, a lateral distance between a portion of the overhang portion closest to the storage space and a portion of the lower seal portion closest to the storage space. However, it may be 3 mm or more and 15 mm or less.

  In the pouch according to one embodiment of the present invention, the width of the upper seal portion may be 8 mm or more and 15 mm or less.

  In the pouch according to one embodiment of the present invention, the overhang portion includes a further corner region protruding toward the housing space side at a position closer to the upper seal portion than the lower seal portion. Is also good.

  According to one embodiment of the present invention, since the width of the lower seal portion is smaller than the width of the upper seal portion, after heating in the microwave oven, the upper seal portion becomes the lower seal portion. The part that is not hot is wider than it is. Therefore, after heating in the microwave oven, it is possible to suppress the feeling of excessive heat by gripping the upper seal portion of the pouch. In addition, since the upper seal portion does not protrude toward the storage space side than the protruding portion, a wide frontage for filling the content can be secured, and the content can be efficiently filled.

  Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. As described below, the pouches according to Examples 1 to 3 and Comparative Examples 1 to 4 were produced, and the steam releasing function, the opening characteristics, and the content were evaluated.

(Example)
Embodiments 1 to 3 correspond to the standing type pouch shown in FIG.

  The body material sheet forming the body and the bottom material sheet forming the bottom are arranged at predetermined positions, and an area (upper seal) of these sheets to be used as a seal portion of each pouch to be formed is formed. (Excluding the area to be part). At this time, the region of the body sheet that was not heat-sealed was divided into a region to be a space for accommodating each pouch and a region to be a first unsealed portion by a region that was heat-sealed. Thereafter, a plurality of pouches were manufactured by cutting the heat-sealed portion according to the shape of each pouch. After filling the prepared pouch with 100 g of water as the content, the vicinity of the upper edge of the stacked main surface sheet was heat-sealed to seal the pouch. In this way, pouches according to Examples 1 to 3 were produced.

  The dimensions of each part of the produced pouch according to Examples 1 to 3 were as shown in FIG. Further, for each of the pouches according to Examples 1 to 3, the values of W1, W2, W7, W8 and S2 shown in FIG. The dimensions of each part are in units of mm.

(Comparative example)
The pouches according to Comparative Examples 1 to 4 correspond to the pouches according to Examples 1 to 3 in which at least one of the dimensions of W1, W2, W7, W8, and S2 is changed. Therefore, the pouches according to Comparative Examples 1 to 4 were produced using the same material as the pouches according to Examples 1 to 3 and by the same manufacturing method as the pouches according to Examples 1 to 3. For each of the pouches according to Comparative Examples 1 to 4, the values of W1, W2, W7, W8, a1, a2, and S2 shown in FIG. In the pouch according to Comparative Example 3, since W1 is 16 mm, W2 is 6 mm, and S2 is 10 mm, the inner edge of the upper seal portion and the inner edge of the overhanging portion are located in the same straight line.

(Evaluation results)
Table 1 shows the evaluation results of the pouches according to Examples 1 to 3 and Comparative Examples 1 to 4 obtained above, which were evaluated for the function of removing steam, the usability, the content and the suitability for filling. Among them, the evaluation of the steam release function was performed by placing each sealed pouch in a microwave oven and heating at 600 W for 2 minutes, visually checking whether steam had escaped from the first unsealed portion during heating, and checking the sealed portion after heating. This was performed by inspecting for the occurrence of peeling. In the column of the evaluation result of the steam release function in Table 1, the escape of steam from the first unsealed portion during heating can be confirmed, and only the overhanging portion of the sealing portion peels off after heating, and the portion other than the overhanging portion is removed. A case where no peeling was observed in the region was evaluated as ○. On the other hand, a case where no escape of steam was confirmed from the first unsealed portion during heating or a case where the progress of peeling was confirmed from a region other than the protruding portion of the sealed portion after heating was rated as x.

(Usability)
Usability was evaluated by pinching the upper seal portion with a finger immediately after heating in the microwave oven, which was performed in the evaluation of the steam release function. In the column of the evaluation results of the opening characteristics in Table 1, when the pouch could be quickly opened without feeling excessive heat when the upper seal portion was pinched with a finger, the evaluation was evaluated as ○. On the other hand, when the upper seal portion was pinched with a finger, excessive heat was felt and the pouch could not be quickly opened.

(Internal capacity)
The evaluation of the content was performed by comparing the sizes of the storage spaces for storing the contents. In the column of the evaluation result of the internal capacity in Table 1, when it was judged that the size of the accommodation space was equivalent to that of the pouch for a microwave oven distributed in the market, it was evaluated as ○. On the other hand, when it was judged that the accommodation space was small compared to the pouch for microwave ovens distributed in the market and was lacking in the competitiveness in the market, it was evaluated as x.

(Fillability)
The filling suitability was evaluated by evaluating the suitability of filling the pouch with 100 g of water as a content before heat sealing the vicinity of the upper edge of the main surface sheet. In the column of the evaluation results of the suitability for filling in Table 1, when the pouch according to Comparative Example 3 was more excellent in the suitability for filling, it was evaluated as ○.

  In the pouches according to Examples 1 to 3, steam escaped from the first unsealed portion while being heated in the microwave oven. After heating, the seal was inspected for the occurrence of peeling. As a result, only the overhanging portion of the seal was peeled off, and no peeling was observed in a region other than the overhanging portion. Even if the upper seal portion was pinched with a finger immediately after the heating in the microwave oven, the pouch could be opened quickly without feeling excessive heat. Furthermore, it was excellent in the suitability for filling the contents. Therefore, the pouches according to Examples 1 to 3 have a steam release function, are excellent in filling suitability of contents, and can be quickly opened even after warming in a microwave oven.

  In the pouch according to Comparative Example 1, if the upper seal portion was pinched with a finger immediately after the heating in the microwave oven was over, the user felt excessive heat and could not quickly open the pouch. For this reason, the pouch according to Comparative Example 1 was not suitable for use as a pouch for a microwave oven, so that the evaluation of the opening characteristics was evaluated as x.

  In the pouch according to Comparative Example 2, it was determined that the size of the accommodation space was smaller than that of the pouch for a microwave oven distributed in the market, and the market was not competitive. For this reason, the pouch according to Comparative Example 2 could not be provided at a competitive price in the market, and thus the evaluation of the content was x.

  The pouch according to Comparative Example 3 was significantly inferior to the pouch according to Examples 1 to 3 in the suitability for filling the contents. For this reason, the pouch according to Comparative Example 3 was evaluated as x in the evaluation of the suitability for filling the contents.

  In the pouch according to Comparative Example 4, after heating, the presence or absence of peeling of the seal region was inspected. As a result, the progress of peeling was confirmed from the lower seal portion of the first side seal portion. For this reason, the pouch according to Comparative Example 4 was not suitable for use as a pouch for a microwave oven, and the evaluation of the steam release function was x.

REFERENCE SIGNS LIST 1 pouch 2 accommodation space 2a upper edge 2c lower edge 7 notch 10 body 11 main surface sheet 20 bottom 21 bottom sheet 30 laminated film 50 sealing portion 50a outer edge 50b inner edge 51 first side sealing portion 52 second side sealing portion 53 Upper seal portion 55 Overhang portion 55b Inner edge 55c of overhang portion Upper overhang region 55d Lower overhang region 55e Middle overhang region 55f Upper corner region 55g Lower corner region 56 Upper seal portion 56b Inner edge 57 of upper seal portion Lower seal portion 58 Second upper seal portion 58a Inner edge 59 Second lower seal portion 59a Inner edge 60 First unsealed portion 61 Opening

Claims (12)

A pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films,
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner region protruding toward the housing space side, an upper overhang region extending from the upper seal portion , and a lower corner region interposed between the upper overhang region and the lower overhang region. and Chuhari Deryo zone connected to, connected to the upper protruding region and the Chuhari out region, projecting toward the housing space side at a position close to the upper sealing portion than the lower seal portion And the upper corner area ,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner region connects the said Chuhari Deryo region and the lower protruding region acute or a right angle,
Pouch. Edge of the housing space side of the lower protruding region is linear, the edge of the housing space side of the connected the Chuhari Deryo zone in the lower corner region is linear,
The edge of the housing space side of the corner region, the edges of the housing space side of the lower protruding region, not located on the lower side of the straight portion, the pouch according to claim 1. Edge of the first non-sealing portion has a portion extending in a straight line with facing the edge of the housing space side of the lower protruding region, the said Chuhari Deryo region connected to said corner region 3. The pouch according to claim 1, comprising: a portion facing the edge on the storage space side and extending linearly. 4. A pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films,
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner area protruding toward the housing space side, and an upper overhang area extending from the upper seal portion and connected to the lower corner area,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to a sharp angle and the lower projecting region and before SL on projecting region,
Pouch. Edge of the housing space side of the lower protruding region is linear, the edge of the housing space side of said corner region connected before SL on projecting regions are linear,
5. The pouch according to claim 4 , wherein an edge of the lower corner region on the housing space side is not located below a linear portion of the edge of the lower overhang region on the housing space side. 6. Edge of the first non-sealing portion, the said housing and a portion extending linearly with facing the edge of the space side, said corner region connected before SL on the protruding region of the lower protruding region The pouch according to claim 4 , further comprising: a portion facing the edge on the storage space side and extending linearly. The portion of the edge portion of the first unsealed portion facing the edge portion of the lower overhang area on the accommodation space side extends linearly at least up to the lower seal portion. 7. The pouch according to 3 or 6 . Among the edge of the first non-sealing portion, a portion facing an edge of the housing space side of the lower protruding region extends linearly up to the opening, according to claim 7 Pouch. The pouch according to any one of claims 1 to 8 , wherein the content is accommodated in the accommodation space and an upper seal portion is formed. A method for manufacturing a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films,
The pouch is
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner region protruding toward the housing space side, an upper overhang region extending from the upper seal portion , and a lower corner region interposed between the upper overhang region and the lower overhang region. and Chuhari Deryo zone connected to, connected to the upper protruding region and the Chuhari out region, projecting toward the housing space side at a position close to the upper sealing portion than the lower seal portion And the upper corner area ,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to said lower protruding region and the Chuhari Deryo region acute or a right angle,
The manufacturing method comprises:
Providing a laminated film, wherein a plurality of the pouches can be allocated along a lateral direction of the pouches;
Heat sealing the laminated film to form a heat-sealed region on the laminated film, including a region to be the first side seal portion and the second side seal portion. Process and
A cutting step of cutting an area to be the first side seal portion and the second side seal portion of the stacked laminated films. A method for manufacturing a pouch having a storage space for storing contents, which is made by heat-sealing the stacked laminated films,
The pouch is
A first side seal portion and a second side seal portion which are heat-sealed on the laminated film and are located opposite to each other in the lateral direction;
A first unsealed portion that is separated from the storage space by the first side seal portion and the stacked laminated film is not heat-sealed;
Has,
The first unsealed portion is located closer to the upper side of the pouch, and is open to a side edge of the stacked laminated film, and is open.
The first side seal portion includes an upper seal portion and a lower seal portion located on both sides of the first unsealed portion, and the upper seal portion surrounding at least a part of the first unsealed portion. A protruding portion connected to the portion and the lower seal portion, and protruding toward the housing space side from the upper seal portion and the lower seal portion,
The overhang portion is a lower overhang region extending laterally from the lower seal portion, and a position connected to the lower overhang region and closer to the lower seal portion than the upper seal portion. A lower corner area protruding toward the housing space side, and an upper overhang area extending from the upper seal portion and connected to the lower corner area,
In a plan view, from the center of an imaginary circle having a center at the center of the upper middle point that is the center of the upper edge of the accommodation space and the lower middle point that is the center of the lower edge of the accommodation space, When a virtual straight line that is the shortest distance to the first unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the overhanging portion is a1, and the length of the lower side sealing portion of the first side sealing portion is When the width is W2 and the width of a portion of the second side seal portion which is located in a laterally opposing relationship with the lower seal portion of the first side seal portion is W5, a1 <W2 and a1 <W5 is satisfied,
The corner area is connected to a sharp angle and the lower projecting region and before SL on projecting region,
The manufacturing method comprises:
Providing a laminated film, wherein a plurality of the pouches can be allocated along a lateral direction of the pouches;
Heat sealing the laminated film to form a heat-sealed region on the laminated film, including a region to be the first side seal portion and the second side seal portion. Process and
A cutting step of cutting an area to be the first side seal portion and the second side seal portion of the stacked laminated films. The pouch has a second unsealed portion that is separated from the storage space by the second side seal portion and the stacked laminated film is not heat-sealed,
The heat sealing step, the laminated film,
The heat-sealed area;
The first unsealed portion and the second unsealed portion, which are sandwiched between two heat-sealed regions adjacent in the lateral direction and are to be the accommodation space, and are surrounded by one heat-sealed region. An area that was not heat-sealed, including an area to be sealed,
Divided into
The cutting step includes, in the stacked laminated films, regions to be the first side seal portion and the second side seal portion, and the first unsealed portion and the second unsealed portion. The pouch manufacturing method according to claim 10 or 11 , wherein a region to be cut is cut in a direction intersecting the lateral direction.

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