JP6425122B2 - Pouch - Google Patents

Description

  The present invention relates to a pouch made by heat-sealing stacked laminated films.

  For example, pouches for microwave ovens containing retort foods and frozen foods are widely used. In general, pouches for microwave ovens are made by heat sealing the periphery of a laminated film.

  For example, in Patent Document 1, a ring-shaped point seal is provided on a part of the pouch so that the vapor generated as a result of heating in the microwave oven escapes to the outside of the bag, and the portion surrounded by the point seal is A pouch with a steam vent is described. According to the pouch described in Patent Document 1, when the pressure in the pouch increases with heating, the ring-shaped point seal peels off, and the storage space in the pouch leads to the steam vent hole in the ring-shaped point seal . This allows the vapor in the pouch to escape from the vapor vent. After heating in the microwave oven, the peripheral seal provided on the periphery of the pouch can be pinched and the pouch can be opened to take out the contents.

Patent No. 4029590

  In order to secure a wide storage space for storing the contents by using a laminated film of a limited size, it is effective to narrow the width of the peripheral seal provided on the peripheral edge of the pouch. However, if the width of the pouch peripheral seal is narrowed, after heating in the microwave oven, the peripheral seal becomes hot and it is necessary to stand until the peripheral seal cools. For this reason, after heating in a microwave oven, the pouch can not be opened quickly.

  The present invention has been made in consideration of these points, and it is an object of the present invention to provide a pouch which has a vapor removal function, can efficiently fill contents, and is excellent in usability.

  In the pouch described in Patent Document 1, the ring-shaped point seal is provided at a position inward of the peripheral seal of the pouch, so the space for filling the contents in the pouch will be narrowed. Furthermore, in order to absorb variations in the position of the steam vent holes, the ring-like point seal requires a certain size, and the space for filling the contents in the pouch is narrowed more and more. As a result of these, the pouch described in Patent Document 1 can not widely secure a frontage for filling the contents into the pouch, and has a problem that the contents can not be efficiently filled.

  Furthermore, in the pouch described in Patent Document 1, it is necessary to check whether the steam vent hole has been opened at a predetermined position surrounded by the ring-shaped point seal. In addition, there is also a need to reliably recover the waste generated when making the steam removal hole so as not to damage the commercial property. As a result of these, it is difficult to efficiently manufacture the pouch described in Patent Document 1.

  Therefore, it is even more convenient if the pouch according to the invention can even be manufactured efficiently.

The pouch according to the present invention is a pouch made by heat-sealing the stacked laminated film and having a storage space for containing the contents, the side seal portion heat-sealing the stacked laminated film; And an unsealed portion separated from the accommodation space by the side sealing portion and the stacked laminated film is not heat-sealed, the unsealed portion being positioned on the upper side of the pouch and overlapped. The side seal portion is open at the side edge of the laminated film, and the side seal portion is at least a portion of the unsealed portion and an upper seal portion and a lower seal portion located on both sides across the unsealed portion. Connected to the upper seal portion and the lower seal portion so as to surround the lower seal portion, and the accommodation space side of the upper seal portion and the lower seal portion Anda projecting portion projecting toward the projecting portion, and the lower protruding region extends out along the horizontal direction from the lower seal portion, is connected to the lower protruding region, the upper to the seal portion proximate the lower seal portion position, and a lower angle region that protrudes toward the housing space side, anda Chuhari out region connected to the corner region, the lower protruding region The edge on the accommodation space side is linear, the edge on the accommodation space side of the overhanging region is linear, and the edge on the accommodation space side of the lower corner area is the accommodation space Of the upper middle point which is the center of the upper edge of the storage space and the lower middle point which is the center of the lower edge of the storage space in plan view. From the center of the virtual circle with the When in the virtual straight line overlaps with the corner region, the width of the lower sealing portion is smaller than the width of the upper seal portion.

  In the pouch according to the present invention, the width of the overhanging portion may be narrower than the width of the lower sealing portion.

  In the pouch according to the present invention, a lateral distance between a portion located closest to the accommodation space side of the overhanging portion and a portion located closest to the accommodation space side of the lower seal portion is 3 mm or more 15 mm or less may be sufficient.

  In the pouch according to 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 the present invention, the overhanging portion may include a further corner area projecting toward the accommodation space at a position closer to the upper seal portion than the lower seal portion.
In the pouch according to the present invention, the edge on the unsealed portion side of the lower overhanging region may be linear, and the edge on the unsealed portion side of the overhung region may be linear.
In the pouch according to the present invention, the edge on the unsealed portion side of the lower overhanging region may extend linearly to the edge on the first unsealed region side of the lower sealed portion.
In the pouch according to the present invention, the edge on the unsealed portion side of the lower seal portion is linear to the opening on the same straight line as the edge on the unsealed portion side of the lower overhang region. It may extend.
In the pouch according to the present invention, the content may be accommodated in the accommodation space, and an upper seal portion may be formed.

  According to the present invention, since the width of the lower seal portion is smaller than the width of the upper seal portion, the upper seal portion becomes hotter than the lower seal portion after the heating in the microwave oven is finished. The part that is not Therefore, after the heating in the microwave oven is finished, 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 extend beyond the extension portion toward the accommodation space side, a wide opening for filling the contents can be secured, and the contents can be efficiently filled.

FIG. 1 is a plan view showing an example of a pouch according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a layered 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 an imaginary circle inscribed in the seal portion of the pouch shown in FIG. FIG. 6 is a plan view for explaining the dimensions of the components of the pouch shown in FIG. FIG. 7 is a plan view for explaining the method of 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 modified example 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 showing the 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, for the sake of easy illustration and understanding, the scale, vertical and horizontal dimensional ratios, etc. are exaggerated and changed from those of a real thing as appropriate. FIG. 1 is a plan view showing an example of a pouch 1 according to an embodiment of the present invention.

  The pouch 1 shown in FIG. 1 is a standing pouch which is formed by heat sealing the body 10 and the bottom 20. As shown in FIG. 1, the body portion 10 includes a pair of main surface sheets 11 composed of a front main surface sheet 11 a and a back main surface sheet 11 b disposed to face each other, and a pair of overlapped The side edge 13 vicinity of the main surface sheet 11 is heat-sealed mutually. A bottom sheet 21 forming a bottom 20 is disposed between lower edges 14 of the pair of main surface sheets 11. Then, in a space surrounded by the pair of main surface sheets 11 and the bottom surface sheet 21, a storage space 2 for storing the contents is partitioned. The bottom sheet 21 is bent so as to be convex toward the accommodation space 2, and the vicinity of the periphery is heat-sealed together with the lower portion of the overlapping main surface sheet 11. The bottom sheet 21 holds the shape of the lower end of the pair of main surface sheets 11 to provide the pouch 1 with a self-supporting property.

  Further, 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 designed to ensure a wide opening 4 so that the contents can be efficiently filled from the opening 4. After the contents are filled, the portion around the upper edge 12 provided with the opening 4 is sealed by heat sealing to obtain the pouch 1.

(Laminated film)
First, the films constituting the pair of main surface sheets 11 forming the body portion 10 and the bottom surface sheet 21 forming the bottom portion 20 will be described. In the present embodiment, the pair of main surface sheets 11 and the bottom surface sheet 21 are made of the laminated film 30. The layer configuration of the laminated film 30 is shown in FIG. As described above, the pouch 1 is made into a bag by heat sealing the laminated film 30 forming the pair of main surface sheet 11 and the bottom surface sheet 21. For this reason, the laminated film 30 is provided with a sealant layer 34 having a sealing property in a portion to be the inner side of the container. Moreover, in the pouch 1 for microwave ovens, the base material layer 31 to be a printing base material is provided at a portion on the container outer side than the sealant layer 34. Furthermore, 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 directed from the outer side of the container to the inner side of the container when making the pouch 1 into a pouch 1, the base layer 31, the intermediate layer 33, and the sealant The layers 34 are included in this order. Each layer will be described in detail below.

  As mentioned above, the pouch 1 for microwave ovens is required to be resistant to heat. For this reason, the base material layer 31 of the present embodiment is made of a material having heat resistance. For example, as the base material 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 polypropylene / ethylene-vinyl alcohol copolymer co-pressed co-stretched film Or a composite film in which two or more of these films are laminated can be used.

  Preferably, the base material layer 31 is biaxially stretched. As a result, the molecules forming the base layer 31 are aligned in the stretching direction by the stretching process, and the base layer 31 exhibits excellent dimensional stability. Moreover, easy-opening property can be provided to the base material layer 31 by biaxial stretching processing.

  The thickness of such a base material layer 31 is formed to, for example, 10 to 50 μm. In this case, the product cost can be suppressed while the heat resistance required for the pouch 1 is satisfied. In addition, the base material layer 31 of this Embodiment functions also as a layer which becomes the container outer side most when making a bag into pouch 1 among laminated | multilayer film 30. FIG.

  Further, as shown in FIG. 2, in the present embodiment, a pattern layer 32 including a pattern is laminated on the surface of the base material layer 31 on the inner side of the container. Here, the design is a recording target of various modes that can be recorded or printed on the base material layer 31, and is not particularly limited, and a figure, a character, a pattern, a pattern, a symbol, a design, a mark, etc. Widely included. In particular, in the laminated film 30 used for the pouch 1 intended to contain a food, as a design, a character indicating the information such as the figure of the contents, the brand name of the contents, the expiration date, the production date, and the production number Is used. However, the design layer 32 is laminated on the base material layer 31 according to the specification of the product, and the design layer 32 may not be provided on the base material layer 31.

  In the present embodiment, the picture layer 32 is applied not to the outer surface of the base layer 31 on the container outer side but to the inner surface of the base layer 31. In this case, since the picture layer 32 is excellent in abrasion resistance, it is possible to effectively prevent the disappearance due to rubbing or the like, and also to effectively prevent the falsification of the picture. In addition, when the bag is made into the pouch 1, the base layer 31 has transparency so that the pattern layer 32 laminated on the inner surface of the base layer 31 can be viewed through the base layer 31. Is preferred.

  As described above, the sealant layer 34 is provided to laminate the two laminated films 30 together and heat-seal the vicinity of the facing edge to bond and seal the edge. Further, in the present embodiment, the sealant layer 34 is disposed on the most inner side of the laminated film 30 when the bag is made into the pouch 1.

  As such a sealant layer 34, a heat-resistant film and an easy peel film made of a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene block copolymer and the like can be adopted. Furthermore, the sealant layer 34 may be configured as a single layer by a film made of these materials, or alternatively, the sealant layer 34 may be configured as a multilayer by a plurality of films made of the above-described materials.

  In particular, when the laminated film 30 is applied to the pouch 1 requiring heat resistance such as a pouch for a microwave oven, the sealant layer 34 is a non-oriented polypropylene layer (CPP layer) mainly containing non-oriented 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 to 200 μm.
In this case, not only the impact resistance against drop which may occur in the distribution process of the pouch 1 is excellent, but also the handleability such as the ease of filling the contents and the ease of refilling the contents is excellent.

  On the other hand, the intermediate layer 33 laminated between the base material layer 31 and the sealant layer 34 is provided to compensate for various functions required for the pouch for a microwave oven. As described above, the pouch 1 is a pouch suitable for containing a food as a content. Thus, the intermediate layer 33 prevents the permeation of water vapor and the permeation of gases such as oxygen gas so that the contents can be preserved while preventing deterioration such as oxidation of the contents. It may have gas barrier properties. In addition, the pouch 1 of the standing pouch type is displayed in a stand-alone state on the product shelf of the counter. The intermediate layer 33 may have flex resistance and impact resistance so that the pouch 1 can sufficiently withstand an impact or the like when the pouch 1 is dropped from the product shelf. In addition, the middle layer 33 may have a function of sufficiently enhancing the concealing property so that the contents of the pouch 1 are not visible, in order to increase the consumer's purchase intention.

  As the intermediate layer 33 having such a function, for example, polyolefin such as polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer saponified product, etc. Or films coated with polyvinylidene chloride or films deposited with an inorganic substance such as silicon oxide or aluminum oxide or films of polyvinylidene chloride or the like. Also, one or more of these substrates may be used in combination.

  As shown in FIG. 2, in the present embodiment, the bonding layer 35 is interposed between the base material 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 adhesive, a polyacrylate adhesive, a cyanoacrylate adhesive An ethylene copolymer based adhesive, a cellulose based adhesive, a polyester based adhesive, a polyamide based adhesive, an amino resin based adhesive, an epoxy based adhesive, a polyurethane based adhesive and the like can be used.

(Seal part)
The seal portion 50 is formed by heat-sealing the vicinity of the peripheral edge of the pair of main surface sheets 11 and the 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. Moreover, the sealing unit 50 isolates the first unsealed unit 60 and the second unsealed unit 70 located closer to the upper side of the pouch 1 from the accommodation space 2 sealed by the sealing unit 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 across the housing space 2 doing.

  The first unsealed portion 60 is provided to communicate with the storage space 2 and release the vapor in the pouch 1 to the outside when the pressure in the pouch 1 is increased by the vapor generated along with the heating by the microwave oven. ing. The first unsealed portion 60 reaches the side edge 13 of the main surface sheet 11 and opens. That is, the first unsealed portion 60 forms an opening 61 in 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 the formation of the opening 61 in the side edge 13 of the main surface sheet 11 when manufacturing the pouch 1 as described later. There is. 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 opened. That is, the second unsealed portion 70 forms the opening 71 in the side edge 13 of the main surface sheet 11. The second unsealed portion 70 may not necessarily be provided.

  Now, the seal unit 50 will be further described. As shown in FIG. 1, the outer edge 50 a of the seal portion 50 extends along the edge portions 12 to 14 of the main surface sheet 11, the edge portion of the first unsealed portion 60 or the edge portion of the second unsealed portion 70. It extends in the shape of On the other hand, the inner edge 50b of the seal portion 50 extends in a circumferential shape while being spaced from the outer edge 50a.

  In the seal portion 50 of the present embodiment, the first side seal portion 51 and the second side seal portion 52 positioned opposite to the lateral direction d1 are positioned opposite to the vertical direction d2 orthogonal to the lateral direction d1. And an upper seal portion (an area surrounded by a two-dot chain line in FIG. 1) 53 and a lower seal portion 54. Each side seal part 51, 52 heat-seals the side edge 13 vicinity of a pair of main surface sheets 11, and the upper seal part 53 heat-seals the upper edge 12 vicinity of a pair of main surface sheets 11. The lower seal portion 54 is formed by heat sealing the vicinity of the peripheral edge of the bottom sheet 21 and the vicinity of the lower edge 14 of the main surface sheet 11. The first unsealed portion 60 and the second unsealed portion 70 described above are separated from the accommodation space 2 by the corresponding side seal portions 51 and 52, respectively.

  In FIG. 3, the 1st side seal part 51 of the 1st unsealed part 60 vicinity is expanded and shown. 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 positioned on both sides of the first unsealed portion 60, and the first unsealed portion 60. An overhanging portion 55 which is connected to the upper seal portion 56 and the lower seal portion 57 so as to surround the portion, and which protrudes toward the accommodation space 2 beyond the upper seal portion 56 and the lower seal portion 57; It contains. The upper seal portion 56 extends from the periphery of the first unsealed portion 60 along the vertical direction d 2 and is connected to the upper seal portion 53. On the other hand, the lower seal portion 57 extends from the periphery of the first unsealed portion 60 along the vertical direction d 2 and is connected to the lower seal portion 54.

  As shown in FIG. 3, the overhanging portion 55 has an upper overhanging region 55 c extending from the upper seal portion 56 along the lateral direction d 1, and a lower extending from the lower seal portion 57 along the lateral direction d 1. It includes an overhanging area 55d, and a overhanging area 55e interposed between the upper overhanging area 55c and the lower overhanging area 55d. In the example shown in FIG. 3, the overhanging area 55 e extends along the vertical direction d2 at a position between the first unsealed portion 60 and the accommodation space 2. The overhanging region 55e is connected via the upper overhanging region 55c and the upper corner region 55f, and is connected via the lower overhanging region 55d and the lower corner region 55g.

  The upper corner region 55 f protrudes toward the accommodation space 2 at a position closer to the upper seal portion 56 than the lower seal portion 57, and the lower corner region 55 g is a lower seal portion 57 than the upper seal portion 56. It projects toward the accommodation space 2 side at a position close to the. The lower corner region 55g of the overhanging portion 55 overhanging toward the housing space 2 functions to stably start peeling from the overhanging portion 55 when it is warmed in the microwave oven. In the example shown in FIG. 3, the upper corner region 55 f and the lower corner region 55 g have a fan-like shape with a central angle of 90 ° in plan view. In addition, planar view means seeing the pouch 1 from the direction orthogonal to both the horizontal direction d1 and the up-down direction d2.

  Further, in the present embodiment, the overhanging region 55 e of the overhanging portion 55 forms a step S <b> 1 between itself and the upper seal portion 56. Therefore, the inner edge 55 b of the overhanging portion 55 is located closer to the accommodation space 2 than the inner edge 56 b of the upper seal portion 56. Further, the overhanging region 55 e of the overhanging portion 55 forms a step S <b> 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 overhanging region 55e with respect to the inner edge 57b of the lower seal portion 57 is 3 mm or more.

  In particular, the upper seal portion 56 is formed with a first notch 7a that can be a starting point for opening. That is, the position where the first notch 7a is provided is the planned opening position CP1 when the body 10 is opened to take out the contents stored in the storage space 2. The first notch 7 a shown in FIG. 3 penetrates the main surface sheet 11 forming the trunk 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. By forming the first notch 7a in the upper seal portion 56, the body 10 can be easily opened from the first notch 7a.

  FIG. 4 is an enlarged view of the second side seal portion 52 in the vicinity of the second unsealed portion 70. As shown in FIG. 4, the second side seal portion 52 includes a second upper seal portion 58 relatively closer to the upper edge 12 and a second lower seal portion relatively closer to the lower edge 14. 59, and. The inner edge 58 b of the second upper seal portion 58 is located closer to the housing space 2 than the inner edge 59 b of the second lower seal portion 59. For this reason, 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 S <b> 3 is located near the second unsealed portion 70.

  In particular, the second upper seal portion 58 is formed with a second notch 7b which can be a starting point for opening. That is, the position where the second notch 7b is provided is another planned opening position CP2 when the body 10 is opened to take out the content stored in the storage space 2. The second notch 7 b shown in FIG. 4 penetrates the main surface sheet 11 forming the trunk 10. The second notch 7 b may be a cut formed in the second upper seal portion 58 or may be a notch having a predetermined width. By forming the second notch 7b in the second upper seal portion 58, the body 10 can be easily opened even from the second notch 7b.

  The planned opening positions CP1 and CP2 can be provided with various easy opening means known per se, not limited to the notches 7a and 7b. Another example of the easy opening means is an example in which the upper seal portion 56 or the second upper seal portion 58 is provided with a plurality of minute small holes. By providing a plurality of minute small holes in the upper seal portion 56 or the second upper seal portion 58, easy openability can be provided.

  Now, as described above, the main surface sheet 11 and the bottom surface sheet 21 are configured of the same laminated film 30. Therefore, when heat sealing near the periphery of the stacked laminated film 30 under the same heat sealing conditions, the bonding strength at any one point in the sealing portion 50 is equal to the bonding strength at another one point. For this reason, the ease of peeling of the seal portion 50 when the pressure in the pouch 1 increases with heating is largely dependent on the stress concentration induced due to the position, the shape, and the like of the seal portion 50.

  In this respect, in the present embodiment, it is intended that the peeling of the pair of main surface sheets 11 proceeds from the overhang portion 55 at the time of heating by the microwave oven and the storage space 2 and the first unsealed portion 60 are communicated. There is. Then, in order to facilitate peeling of the pair of main surface sheets 11 from the overhanging portion 55, the overhanging portion 55 overhangs toward the housing space 2 side than the other portions 56 and 57 of the first side seal portion 51, And, the lower corner area 55g is included. When the present inventors thoroughly researched, in order to realize the progress of peeling of the pair of main surface sheets 11 from the overhang portion 55 more stably, in FIG. A relationship is satisfied that indicates that the length of the overlapping range with the out portion 55 is shorter than the length of the overlapping range of the second imaginary straight line IL2 and the second side seal portion 52, a1. Was found to be preferable. FIG. 5 is a view for explaining the starting point of peeling of the seal portion 50, and shows the pouch 1 as a plan view. The length of the overlapping range of the first virtual straight line IL1 and the overhanging portion 55 is a1, and the length of the overlapping range of the second virtual straight line IL2 and the second side seal portion 52 is a2. , Will be described in detail later.

  As shown in FIG. 5, the accommodation space 2 that expands with heating can be regarded as expanding from the center O located near the center of the pouch 1. Therefore, the load in the direction from the center O toward each position is strongly received at each position of the seal portion 50 with heating. That is, the pressure applied to the seal portion 50 with 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 the space surrounded by the pair of main surface sheets 11 and the bottom sheet 21. For this reason, the outer edge of the accommodation space 2 is defined in the boundary with the surface by the side of the accommodation space 2 of a pair of main surface sheet 11 and the bottom sheet 21. Therefore, in plan view, the outer edge of the accommodation space 2 is the upper edge 2a defined at the boundary with the upper seal portion 53 where the pair of main surface sheets 11 is joined, and the side seal where the pair of main surface sheets 11 is joined Defined by a side edge 2b defined at the boundary with the portions 51 and 52, and a lower edge 2c defined at the boundary between the upper seal portion 53 obtained by joining the one main surface sheet 11 and the bottom sheet 21; There is. In particular, a point at the center of the upper edge 2a of the accommodation space 2 is taken as an upper middle point Y1, and a point at the center of the lower edge 2c of the accommodation space 2 is taken as a lower middle point Y2. That is, the upper middle point Y1 is the center of both ends 2a1 and 2a2 of the upper edge 2a of the accommodation space 2, and the lower middle point Y2 is both ends 2c1 and 2c2 of the lower edge 2c of the accommodation space 2 Is the central position of

  First, in a plan view, an imaginary circle C having a center at the center of the upper middle point Y1 and the lower middle point Y2 is drawn. The center of this imaginary circle C is the above-mentioned center O.

  Next, a first virtual straight line IL1 which is the shortest distance from the center O of the virtual circle C to the first unsealed portion 60 is drawn, and the length of the overlapping range of the first virtual straight line IL1 and the overhang portion 55 is a1 Do. Further, a second virtual straight line IL2 which is the shortest distance from the center O of the virtual circle C to the second unsealed portion 70 is drawn, and the length of the overlapping range of the second virtual straight line IL2 and the second side seal portion 52 is Assume a2. As a result of intensive research conducted by the present inventors, it was found that when the relationship of a1 <a2 is satisfied, peeling of the pair of main surface sheets 11 from the overhang portion 55 proceeds more stably.

  In addition, when satisfy | filling the relationship of a1 <a2, the following is estimated as a factor which peeling of a pair of main surface sheets 11 advances more stably from the overhang | projection part 55. FIG. However, the present invention is not limited to the following estimation.

  As described above, with the heating, each position of the seal portion 50 receives a load in the direction from the center O toward the each position. Therefore, in the overlapping range of the first imaginary straight line IL1 which is the shortest straight line drawn from the center O to the first unsealed portion 60 and the overhang portion 55, the load in the direction toward the first unsealed portion 60 is strongly received. . Similarly, in the overlapping range of the second imaginary 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, the load in the direction toward the second unsealed portion 70 Strongly receive Therefore, when the overlapping range length a1 of the overhanging 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 overhanging is The part 55 has a smaller seal cost to bear the load. Therefore, the overhanging portion 55 is less resistant to the load of the vapor pressure than the second side seal portion 52, and the accommodation space 2 and the second unsealed portion 70 communicate with each other before the accommodation space 2 and the second unsealed portion 70 communicate. (1) Since the unsealed portion 60 is in communication, it is considered that steam can be released from the overhang portion 55 stably. In addition, it is considered that the progress of peeling from the seal portion 50 other than the overhang portion 55 can be easily suppressed. In other words, it is considered that the progress of the seal retraction 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 imaginary straight line IL1 overlaps the overhanging portion 55 in the lower corner region 55g.

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

  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 the 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 means the length W in the direction orthogonal to the extending direction of the seal portion 50 at each position X on the inner edge 50b. As an example, the width W1 of the upper seal portion 56 is, at each position on the inner edge of the upper seal portion 56, a length in a direction orthogonal to the extending direction of the upper seal portion 56 at that position. In 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 The largest value among the lengths in the direction orthogonal to the extending direction of the upper seal portion 56 at each position on the inner edge of

  Further, the width W3 of the overhanging portion 55 is smaller than the width W1 of the upper seal portion 56 and the width W2 of the lower seal portion 57. Moreover, the width W3 of the overhanging portion 55 is narrower 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, for example, 2.2. It is set to 5 to 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 lateral direction d1 is longer than the length L5 of the second unsealed portion 70 in the lateral 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 lateral direction d1 is set to 3 to 15 mm, and the length L5 of the second unsealed portion 70 in the transverse direction d1 is set to, for example, 1 to 3 mm. The length L6 in the vertical direction d2 of the unsealed portion 60 and the length L7 in the vertical direction d2 of the second unsealed portion 70 are set to, for example, 4 to 15 mm.

  Further, 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.

  Furthermore, 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 of the lateral direction d1 between the portion z1 located closest to the accommodation space 2 of the overhanging portion 55 and the portion z2 located closest to the accommodation space 2 of the lower seal portion 57 is , 3m or more and 15 mm or less.

  However, the dimensions or the magnitude relationship between the components constituting the pouch 1 are an example, and can be appropriately changed according to the specification.

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

  Next, the operation of the present embodiment configured as described above will be described.

  When the pouch 1 is placed in a microwave oven and warmed, the moisture contained in the contents is warmed by the high frequency emitted from the microwave oven, and the contents are heated. With the heating, the water contained in the contents evaporates and the pressure in the pouch increases. In the present embodiment, the overhanging portion 55 projects to the side of the housing space 2 more than the other portions 56 and 57 of the first side seal portion 51, and includes a lower corner region 55g. For this reason, when the pressure in the pouch increases, peeling of the pair of main surface sheets 11 from the overhanging portion 55 is started. When peeling of the overhanging 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.

  When the heating in the microwave oven is finished, the portion of the body 10, such as the portion other than the portion where the seal portion 50 is formed, is hot in the portion that is in contact with the steam. On the other hand, the seal part 50 does not get hot easily. In particular, according to the present embodiment, the width W1 of the upper seal portion 56 is wider than the width W2 of the lower seal portion 57. Accordingly, the upper seal portion 56 is wider in the portion which is not hotter than the lower seal portion 57. Therefore, even if the upper seal portion 56 is pinched with a finger, it is more difficult to feel heat than pinching the lower seal portion 57 with a finger. Therefore, the upper seal portion 56 is pinched with a finger at a position above the first planned opening position CP1, and the trunk 10 is opened from the first notch 7a provided in the upper seal portion 56. Thereby, the content accommodated in the accommodation 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 the method of manufacturing the pouch 1 shown in FIG.

  As shown in FIG. 7, first, the trunk material sheet 110 to form the trunk portion 10 and the bottom material sheet 120 to form the bottom portion 20 are disposed at predetermined positions, and of these sheets 110 and 120. The area (except for the upper seal portion 53) of the plurality of pouches 1 to be bag-formed is to be heat sealed. At this time, the area of the body sheet 110 which was not heat-sealed was the area heat-sealed to the area 111 which should be the accommodation space 2 of each pouch 1 and the area 112 which should be the first unsealed portion 60. It is divided by 113. Thereafter, the plurality of pouches 1 are manufactured by cutting the heat-sealed area 113 in accordance with the shape of each pouch 1. The contents are filled from the opening 4 formed between the upper edges 12 of the pair of main surface sheets 11 of the obtained pouch 1 and the pouch 1 is heat sealed by heat sealing the vicinity of the upper edge 12 provided with the openings 4. Seal the

  In this manufacturing method, when the area 112 to be the first unsealed portion 60 not to be heat sealed is formed equal to the dimension of the first unsealed portion 60, cutting between adjacent pouches 1 due to processing accuracy If the position to be moved is shifted, the heat sealed area 113 may close the opening 61 of the first unsealed portion 60. Therefore, in the present embodiment, the length in the lateral direction d1 of the region 112 to be the first unsealed portion 60 is made larger than the length in the lateral direction d1 of the first unsealed portion 60. For this reason, when it cuts according to the shape of each pouch 1, a part of area | region 112 which should become the 1st unsealed part 60 of one pouch 1 defines the 2nd unsealed part 70 of the adjacent pouch 1. As shown in FIG. That is, by providing the second unsealed portion 70 in each pouch 1, even if the position to be cut between the adjacent pouches 1 is shifted due to processing accuracy, the first unsealed portion of the pouch 1 is not It is possible to prevent the opening 61 of the sealing portion 60 from being blocked, and to manufacture the pouch 1 continuously.

  As described above, according to the present embodiment, the side seal portion 51 obtained by heat sealing the stacked laminated films 30 and the side seal portion 51 are separated from the housing space 2, and And the unsealed portion 60 reaches the side edge 13 of the stacked laminated film 30 to form the opening 61, and the side seal portion 51 is the first unsealed portion. Connected to the upper seal portion 56 and the lower seal portion 57 so as to surround at least a part of the upper seal portion 56 and the lower seal portion 57 located on both sides of the portion 60 and the unsealed portion 60; And an overhanging portion 55 projecting toward the accommodation space 2 with respect to the upper seal portion 56 and the lower seal portion 57, and the overhanging portion 55 is provided at the lower seal portion 57 than the upper seal portion 56. Near 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 the heating in the microwave oven is completed, the upper seal portion 56 is The portion not hotter than the side seal portion 57 is wide. Therefore, when the upper seal part 56 is pinched with a finger to open the pouch, it is possible to suppress the feeling of excessive heat. Further, since the width W2 of the lower seal portion 57 is narrower than the width W1 of the upper seal portion 56, the width W2 of the lower seal portion 57 and the width W1 of the upper seal portion 56 are equal to each other. The housing space 2 can be widely secured.

  In addition, since the overhanging portion 55 projects toward the housing space 2 more than the upper seal portion 56 and the lower seal portion 57, when the pressure in the pouch 1 is increased with the heating by the microwave, The stress is easily concentrated on the overhanging portion 55. For this reason, peeling can be stably started from the overhang portion 55, and the vapor in the pouch 1 can be reliably released from the first unsealed portion 60. Moreover, since peeling is likely to progress from the overhanging portion 55, it is possible to suppress the progression of peeling from the seal portion 50 other than the overhanging portion 55.

  Moreover, after heating in the microwave oven, the portion around the storage space 2 of the pouch 1 becomes hot and it becomes difficult to handle by hand. For this reason, when carrying out taking out the pouch 1 after a heating from a microwave oven and carrying it, the case where the pouch 1 is unintentionally inclined may be assumed from handling difficulty. In this respect, according to the present embodiment, the first unsealed portion 60 extending from the side edge 13 of the main surface sheet 11 projects to the housing space 2 side more than the upper seal portion 56 and the lower seal portion 57 There is. 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

  Moreover, since it is not necessary to form a steam vent as in the pouch described in Patent Document 1, the problems of inspection and recovery of the scrap that may occur along with the formation of the steam vent can not occur. From the above, according to the pouch 1 of the present embodiment, in addition to the fact that the contents can be efficiently filled, it is also possible to manufacture efficiently.

  Further, according to the present embodiment, the width W3 of the overhanging portion 55 is narrower than the width W2 of the lower seal portion 57. In this case, this contributes to making the overhanging portion 55 easier to peel than the lower seal portion 57. As a result, it is possible to easily suppress the progress of peeling from the seal portion 50 other than the overhang portion 55.

  Further, according to the present embodiment, the lateral direction between the portion z1 located closest to the accommodation space 2 of the overhang portion 55 and the portion z2 located closest to the accommodation space 2 of the lower seal portion 57. 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 is increased, stress is likely to be intensively applied to the overhanging portion 55 projecting from the opening 61 to the accommodation space 2 side. Thereby, it can be made easy to control that exfoliation advances from seal parts 50 other than overhang part 55.

Further, according to the present embodiment, the width W1 of the 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 15 mm or less, the storage space 2 for storing the contents can be widely secured by using the laminated film 30 of a limited size.

  Further, according to the present embodiment, the overhanging portion 55 includes a further upper corner region 55f projecting toward the accommodation space 2 at a position closer to the upper sealing portion 56 than the lower sealing portion 57. It is. In this case, since the step S1 is formed between the overhanging portion 55 and the upper seal portion 56, the overhanging portion 55 is easily adjacent to the housing space 2 in a wide range. For this reason, the area of the overhanging portion 55 to be peeled can be increased, and the vapor can be released without the pressure in the pouch 1 becoming very high, so that the safety is excellent.

  Further, according to the present embodiment, the first virtual straight line IL1 overlaps the overhanging portion 55 in the lower corner region 55g. According to such a configuration, since the width of the overhanging portion 55 in the direction in which the first imaginary straight line IL1 extends gradually increases with distance from the center O of the imaginary circle C, the overhanging portion 55 is easily peeled off. It is possible to easily suppress the progress of peeling from the seal portion 50 other than the overhang portion 55.

  Further, according to the present embodiment, the first side seal portion 51 is separated from the accommodation space 2 by the second side seal portion 52 positioned opposite to the lateral direction d1 and the second side seal portion 52. , And a second unsealed portion 70 in which an opening 71 is formed at an edge portion of the stacked laminated film 30, and the first unsealed portion 60 and the second unsealed portion 70 extend across the housing space 2 It is located facing the direction d1. In this case, the opening 61 of the first unsealed portion 60 of the other pouch 1 is blocked even if the position to be cut between the adjacent pouches 1 deviates due to processing accuracy in the manufacturing process of the pouch 1 It is possible to prevent peeling.

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

  Here, from the viewpoint of advancing the peeling from the overhanging portion 55 more reliably, 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 is increased with the heating by the microwave, the possibility of the pouch 1 being broken can be reduced. The seal strength in the pair of main surface sheets 11 at the overhang 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 is increased with the heating by the microwave, the peeling is reliably started from the overhanging portion 55, and the vapor in the pouch 1 is reliably released from the first unsealed portion 60. be able to. Preferably, the seal strength in the pair of main surface sheets 11 at the overhanging portion 55 is 30 N / 15 mm or less at 100 ° C. In addition, seal strength here means the value (N / 15 mm) of seal strength measured based on JISZ0238. In addition, when the width of the sample piece can not be secured 15 mm, the sample piece having a width smaller than 15 mm is collected and the seal strength is measured, and the obtained value is (15 mm / width of the sample piece The value multiplied by) is adopted as the value of seal strength (N / 15 mm).

  Next, the shape of the first unsealed portion 60 will be described in detail. As shown in FIG. 3, the edge 62 of the first unsealed portion 60 has a first edge 63 and a second edge 64 extending from the periphery of the opening 61 toward the accommodation space 2, and a first edge 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 linearly extends between the tip of the first edge 63 and the tip of the second edge 64, the third edge 65 extends parallel to the vertical direction d2, The first edge 63 and the second edge 64 are orthogonal to each other. In this case, the edge 62 of the first unsealed portion 60 extends along the substantially U-shaped shape. In the present embodiment, the length of the third edge 65, that is, the length L6 in the vertical direction d2 of the first unsealed portion 60 is shorter than the length of the first edge 63 and the length of the second edge 64. .

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

  In addition, the shape of the 1st unsealed part 60 is not limited to the example shown in FIG.3 and FIG.8. 9 and 10 show other examples of the shape of the first unsealed portion 60. FIG. Among 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 linearly extending in the lateral direction d1 is shorter than the length of the second edge 64 linearly extending 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 farther from the accommodation space 2 in the lateral direction d1 than the end connected to the second edge 64 doing.

  In the example shown in FIG. 10, the first unsealed portion 60 has a parallelogram shape in a plan view. Specifically, the first edge portion 63 and the second edge portion 64 linearly extend from the opening 61 downward with respect to the lateral 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 parallel to the vertical direction d2 between the tip of the first edge 63 and the tip of the second edge 64.

«Modification»
Note that various modifications can be made to the embodiment described above. 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, with respect to parts that can be configured in the same manner as the above-described embodiment, the same reference numerals as those used for the corresponding parts in the above-described embodiment are used. Duplicate descriptions will be omitted.

  The form of the 1st side seal part 51 in an embodiment mentioned above is an example, and it is possible to add various change. 11 to 13 show another example of the form of the first side seal portion 51. As shown in FIG. Among them, in the example shown in FIG. 11, the width W1 of the upper seal portion 56 becomes narrower as the upper seal portion 56 approaches the overhang portion 55. In the example shown in FIG. 12, the overhanging portion 55 extends upward from the upper seal portion 56 at an angle with respect to the lateral direction d1, and extends from the lower seal portion 57 in the lateral direction d1. And the lower overhanging region 55d extended, and the upper overhanging region 55c is connected via the lower overhanging region 55d and the lower corner region 55g. The lower corner region 55g protrudes toward the housing space 2 at a position closer to the lower seal portion 57 than the upper seal portion 56.

  In the embodiment described above, as shown in FIG. 1, the pouch 1 is an example of the standing type pouch formed by heat sealing the body 10 and the bottom 20, but the form of the pouch 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. FIGS. 13 to 15 show an example of another form of the pouch 1.

  Among these, in the example shown in FIG. The four-way seal flat pouch 1 shown in FIG. 13 is manufactured only from the pair of main surface sheets 11, and the bottom sheet 21 is not used. Therefore, the lower seal portion 54 is formed by heat sealing the lower edge 14 of the pair of main surface sheets 11.

On the other hand, in the example shown in FIG. 14 and FIG. 15, it is the so-called three-way seal flat pouch 1. The three-way flat pouch 1 shown in FIG. 14 and FIG. 15 is made into a bag by folding a single main surface sheet 11 and heat sealing overlapping edges. Among these, in the example shown in FIG. 14, the lower end of the pouch 1 is formed as a fold in which the single main surface sheet 11 is folded, 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 in which the single main surface sheet 11 is folded back, 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, and the second side seal portion 52 may be formed in the example shown in FIG. 15.
Moreover, the pouch according to one embodiment of the present invention is a pouch which is made into a bag by heat-sealing the stacked laminated film and has a storage space for containing the contents, and the heat-sealing of the stacked laminated film is performed It has a side seal part and an unsealed part which is separated from the accommodation space by the side seal part and the stacked laminated film is not heat-sealed, and the unsealed part is located closer to the upper side of the pouch And the side seal portion is opened up to the side edge of the stacked laminated film, and the side seal portion is provided with an upper seal portion and a lower seal portion located on both sides of the first unsealed portion; It is connected to the upper seal portion and the lower seal portion so as to surround at least a part of the unsealed portion, and the housing space side is more than the lower seal portion A projecting portion extending toward the housing space, the projecting portion including a corner area projecting toward the accommodation space at a position closer to the lower sealing portion than the upper sealing portion; The width of the lower seal portion may be a pouch narrower than the width of the upper seal portion.
In the pouch according to one embodiment of the present invention, the width of the overhanging portion may be narrower than the width of the lower sealing portion.
In the pouch according to one embodiment of the present invention, a lateral distance between a portion of the overhanging portion closest to the accommodation space and a portion of the lower seal portion closest to the accommodation space However, 3 mm or more and 15 mm or less may be sufficient.
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 overhanging portion includes a further corner area projecting toward the accommodation space at a position closer to the upper sealing portion than the lower sealing portion. It is also good.

  Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. The pouches according to Examples 1 to 3 and Comparative Examples 1 to 4 were produced as described below, and evaluated for the steam extraction function, the opening characteristic and the internal volume.

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

  The area where the seal portion of each pouch to be formed is to be the seal portion (upper seal) by arranging the base material sheet that will form the body and the base material sheet that will form the bottom at a predetermined position Heat sealing (except for the area to be a part). At this time, the area which was not heat-sealed in the body material sheet was divided by the area which was heat-sealed into the area which should become the accommodation space of each pouch and the area which should become the first unsealed part. Thereafter, a plurality of pouches were produced by cutting the heat-sealed portion according to the shape of each pouch. The prepared pouch was filled with 100 grams of water as a content, and then the upper edge and the vicinity of the overlapped main surface sheet were heat sealed to seal the pouch. Thus, the pouches according to Examples 1 to 3 were produced.

  The dimensions of each part of the manufactured pouches according to Examples 1 to 3 were as shown in FIG. The values of W1, W2, W7, W8 and S2 shown in FIG. 16 for each of the pouches according to Examples 1 to 3 are as shown in Table 1. The dimensions of each part are in 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 manufactured using the same material as the pouches according to Examples 1 to 3 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 addition, since the pouch which concerns on the comparative example 3 sets W1 to 16 mm, W2 to 6 mm, and S2 to 10 mm, the inner edge of an upper side seal part and the inner edge of an overhang part are located in the same straight line.

(Evaluation results)
Table 1 shows evaluation results obtained by evaluating the steam removing function, usability, internal capacity and filling aptitude for the pouches according to Examples 1 to 3 and Comparative Examples 1 to 4 obtained above. Among them, evaluation of the vapor removal function, put each sealed pouch in a microwave oven and warm it with 600 W for 2 minutes, visually check whether vapor escapes from the first unsealed part during heating, and seal part after heating It carried out by examining about the presence or absence of generation | occurrence | production of peeling. In the column of evaluation results of the steam extraction function in Table 1, it is possible to confirm the escape of steam from the first unsealed portion during heating, and only the overhanging portion of the post-heating sealing portion is peeled off, and other than the overhanging portion The case where generation | occurrence | production of peeling was not confirmed in the area | region was made into O. On the other hand, the case where it was not possible to confirm the escape of the vapor from the first unsealed portion during heating, or the case where the progress of peeling was confirmed from the region other than the overhanging portion of the post-heating seal portion was marked x.

(Usability)
The evaluation of usability was performed by pinching the upper seal portion with a finger immediately after the heating with the microwave oven performed in the evaluation of the vapor removal function was finished. In the column of evaluation results of the opening characteristics in Table 1, when the upper seal portion was pinched with a finger, the pouch was ○ when it was possible to open the pouch quickly without feeling excessive heat. On the other hand, when the upper seal portion was pinched with a finger, it was marked as x when the pouch could not be opened quickly because it felt excessive heat and could not be opened quickly.

(Internal capacity)
The evaluation of the internal volume was performed by comparing the size of the accommodation space for accommodating the contents. In the column of the evaluation results of the internal capacity in Table 1, the case where it was judged that the size of the accommodation space was comparable to that of the pouch for microwave ovens distributed in the market was ○. On the other hand, when the size of the storage space was small compared to the pouch for microwave ovens distributed in the market, it was judged as × when it was judged to be lacking in the market competitiveness.

(Filling aptitude)
The evaluation of the filling aptitude was performed by evaluating the aptitude at the time of filling 100 grams of water as a content into the pouch before heat sealing near the upper edge of the main surface sheet. In the column of the evaluation result of the filling aptitude of Table 1, when it was excellent in the filling aptitude than the pouch concerning comparative example 3, it was set as O.

  In the pouches according to Examples 1 to 3, steam was released from the first unsealed portion while being warmed by the microwave oven. After heating, it was examined as to whether or not peeling of the seal portion occurred. As a result, only the overhanging portion of the seal portion was peeled off, and occurrence of peeling was not confirmed in the region other than the overhanging portion. In addition, even after the upper seal portion was pinched with a finger immediately after the microwave oven had been warmed, the pouch could be opened quickly without feeling excessive heat. Furthermore, the filling aptitude of the contents was also excellent. Therefore, the pouches according to Examples 1 to 3 have a steam removing function, are excellent in the filling aptitude of the contents, and can be quickly opened even after warming with a microwave oven.

  In the pouch according to Comparative Example 1, when the upper seal portion was pinched with a finger immediately after the completion of heating in a microwave oven, excessive heat was felt, and the pouch could not be opened quickly. For this reason, since the pouch which concerns on the comparative example 1 is not suitable for the use as a pouch for microwave ovens, it became x as evaluation of the opening characteristic.

  In the pouch according to Comparative Example 2, it was judged that the size of the storage space was smaller than that of the pouch for microwave ovens distributed in the market, and the lack of competitiveness in the market. For this reason, the pouch according to Comparative Example 2 can not be provided at a competitive price on the market, so the evaluation of the internal capacity was x.

  The pouch according to Comparative Example 3 was significantly inferior to the pouches according to Examples 1 to 3 in terms of the filling aptitude of the contents. For this reason, the pouch which concerns on the comparative example 3 became x as evaluation of the filling aptitude of the contents.

  In the pouch according to Comparative Example 4, after heating, when the presence or absence of peeling of the seal area was inspected, it was confirmed that the peeling progressed from the lower seal portion of the first side seal portion. For this reason, since the pouch which concerns on the comparative example 4 is not suitable for the use as a pouch for microwave ovens, it became x as evaluation of a steam extraction function.

DESCRIPTION OF SYMBOLS 1 pouch 2 accommodation space 2a upper edge 2c lower edge 7 notch 10 body part 11 main surface sheet 20 bottom part 21 bottom sheet 30 laminated film 50 seal part 50a outer edge 50b inner edge 51 first side seal part 52 second side seal part 53 Upper seal portion 55 overhang portion 55b inner edge 55c of overhang portion 55c upper overhang region 55d lower overhang region 55e upper 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 (9)

What is claimed is: 1. A pouch which is made into a bag by heat-sealing stacked laminated films and has a storage space for storing contents,
A side seal that heat-seals the stacked laminated film;
An unsealed portion which is separated from the housing space by the side seal portion and the stacked laminated film is not heat sealed;
Have
The unsealed portion is located close to the upper side of the pouch, and opens to reach the side edge of the stacked laminated film,
The side seal portion includes an upper seal portion and a lower seal portion positioned on both sides of the unsealed portion, and at least a portion of the unsealed portion so as to surround the upper seal portion and the lower seal. An overhanging portion connected to the portion and projecting toward the accommodation space side relative to the upper seal portion and the lower seal portion;
The overhanging portion is connected to a lower overhanging region extending laterally from the lower seal portion and the lower overhanging region, and a position closer to the lower seal portion than the upper seal portion. to include a lower angle region that protrudes toward the housing space side, and a Chuhari out region connected to the corner region,
The edge on the accommodation space side of the lower overhanging region is linear, and the edge on the accommodation space side of the hollow overhanging region is linear, and the edge on the accommodation space side of the lower corner region The part is convexly curved toward the accommodation space ,
From the center of a virtual circle having a center at a position located at the center of an upper middle point at the center of the upper edge of the storage space and a lower middle point at the lower edge of the storage space in plan view When a virtual straight line which is the shortest distance to the unsealed portion is drawn, the virtual straight line overlaps the lower corner area,
A pouch wherein the width of the lower seal portion is narrower than the width of the upper seal portion.   The pouch according to claim 1, wherein the width of the overhanging portion is narrower than the width of the lower sealing portion.   The lateral distance between a portion of the overhanging portion located closest to the accommodation space and a portion of the lower seal portion located closest to the accommodation space is 3 mm or more and 15 mm or less. The pouch according to item 1 or 2.   The pouch according to any one of claims 1 to 3, wherein the width of the upper seal portion is 8 mm or more and 15 mm or less.   The said overhang | projection part includes the further corner area | region which protruded toward the said accommodation space side in the position which adjoined to the said upper seal part rather than the said lower side seal part. The pouch as described in a paragraph. The edge of the said unsealed part side of the said lower overhang | projection area | region is linear shape, The edge of the said unsealed part side of the said hollow overhang | projection area | region is linear shape. The pouch described in. The edge of the said unsealed part side of the said lower overhang | projection area | region is extended linearly to the edge of the said 1st unsealed area | region side of the said lower side seal part to the linear form. The pouch according to one item. The edge of the lower sealing portion on the unsealed portion side extends linearly to the opening on the same straight line as the edge of the lower overhanging region on the unsealed portion side. The pouch according to 7. The pouch according to any one of claims 1 to 8, wherein a content is accommodated in the accommodation space, and an upper seal portion is formed.

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