JP6226100B2 - Pouch - Google Patents

Description

  The present invention relates to a pouch that is bag-formed by heat-sealing stacked laminated films.

  For example, pouches for microwave ovens that contain retort foods or frozen foods are widely used. Usually, a microwave oven pouch is 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 a pouch so that steam generated by heating in a microwave oven is released to the outside of the bag, and a portion surrounded by the point seal is provided. 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 is peeled off, and the accommodation space in the pouch leads to the vapor vent hole in the ring-shaped point seal. . Thereby, the vapor | steam in a pouch can be escaped outside from a vapor | steam vent hole. When the heating in the microwave oven is finished, the contents can be taken out by picking the peripheral seal provided on the peripheral edge of the pouch and opening the pouch.

Japanese Patent No. 4029590

  In order to secure a wide accommodation space for accommodating the contents using a limited-sized laminated film, it is effective to narrow the width of the peripheral seal provided on the periphery of the pouch. However, if the width of the peripheral seal of the pouch is narrowed, the peripheral seal becomes hot after heating in the microwave oven, and it is necessary to leave it until the peripheral seal cools. For this reason, a pouch cannot be opened quickly after heating in a microwave oven.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a pouch having a steam venting function, capable of efficiently filling the contents, and excellent in usability.

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

  In addition, in the pouch described in Patent Document 1, it is necessary to inspect whether or not the steam vent is surely opened at a predetermined position surrounded by the ring-shaped point seal. In addition, it is also necessary to reliably recover the slag 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 is even more convenient if the pouch according to the present invention can be manufactured efficiently.

  The pouch according to the present invention is a pouch that is made by heat-sealing the stacked laminated film and has a storage space for storing the contents, and a side seal portion that heat-seals the stacked laminated film; An unsealed portion that is separated from the accommodation space by the side seal portion and is not heat-sealed, and the unsealed portion is positioned closer to the upper side of the pouch and overlapped. Reaching the side edge of the 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, and at least of the unsealed portion. It is connected to the upper seal portion and the lower seal portion so as to surround a part, and protrudes toward the accommodation space side from the lower seal portion The projecting portion, and the projecting portion includes a corner region projecting toward the accommodation space at a position closer to the lower seal portion than the upper seal portion, and the lower seal portion Is narrower than the width of the upper seal portion.

  In the pouch according to the present invention, a width of the protruding portion may be narrower than a width of the lower seal portion.

  In the pouch according to the present invention, a lateral distance between a portion of the projecting 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. It may be 15 mm or less.

  In the pouch according to the present invention, the width of the upper seal portion may be not less than 8 mm and not more than 15 mm.

  In the pouch according to the present invention, the overhang portion may include a further corner region protruding toward the accommodation space at a position closer to the upper seal portion than the lower seal portion.

  According to the present invention, since the width of the lower seal portion is narrower than that of the upper seal portion, the upper seal portion becomes hotter than the lower seal portion after heating in the microwave oven. The part that is not wide is wide. Therefore, after finishing heating in the microwave oven, it is possible to suppress excessive heat from being felt by gripping the upper seal portion of the pouch. In addition, since the upper seal portion does not protrude from the protruding portion to 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 the layer structure of the laminated film forming the trunk and 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. 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 a 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 modification of the pouch shown in FIG. FIG. 15 is a plan view showing still another modification of the pouch shown in FIG. FIG. 16 is a plan view showing dimensions of the pouch according to the embodiment.

  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 illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product. FIG. 1 is a plan view showing an example of a pouch 1 according to an embodiment of the present invention.

  A 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 trunk | drum 10 contains the pair of main surface sheet | seat 11 which consists of the front main surface sheet | seat 11a and the back main surface sheet | seat 11b arrange | positioned facing each other, and a pair of piled up is carried out. The vicinity of the side edge 13 of the main surface sheet 11 is heat-sealed. A bottom sheet 21 forming a bottom portion 20 is disposed between the lower edges 14 of the pair of main surface sheets 11. A storage space 2 for storing contents is defined in a space surrounded by the pair of main surface sheets 11 and the bottom sheet 21. The bottom sheet 21 is bent so as to be convex toward the accommodation space 2 side, and the vicinity of the periphery thereof is heat-sealed together with the lower part of the overlapping main sheet 11. The bottom sheet 21 retains the shape of the lower end of the pair of main surface sheets 11, thereby providing the pouch 1 with independence.

  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, the pouch 1 of the present embodiment is devised to ensure a wide opening 4 as will be described below, so that the contents can be efficiently filled from the opening 4. After the contents are filled, the vicinity of the upper edge 12 provided with the opening 4 is sealed by heat sealing, and the pouch 1 is obtained.

(Laminated film)
First, the film which comprises the pair of main surface sheet | seat 11 which comprises the trunk | drum 10, and the bottom sheet | seat 21 which comprises the bottom part 20 is demonstrated. In the present embodiment, the pair of main surface sheet 11 and bottom surface sheet 21 is composed of a laminated film 30. FIG. 2 shows the layer configuration of the laminated film 30. As described above, the pouch 1 is manufactured by heat-sealing the laminated film 30 that forms the pair of main surface sheets 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. Further, in the microwave oven pouch 1, 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 to provide various functions required for a microwave oven pouch. Therefore, the laminated film 30 having such a layer configuration includes the base material layer 31, the intermediate layer 33, and the sealant from the container outer side toward the container inner side when the pouch 1 is made into a bag. Layer 34 is included in this order. Hereinafter, each layer will be described in detail.

  As described above, the microwave pouch 1 is required to have heat resistance. For this reason, the base material layer 31 of this Embodiment consists of material with 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-extrusion co-stretched film 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 molecule | numerator which makes the base material layer 31 arranges in the extending | stretching direction by an extending | stretching process, and the base material layer 31 comes to exhibit the outstanding dimensional stability. Moreover, easy-openability can be provided to the base material layer 31 by a biaxial stretching process.

  Such a base material layer 31 has a thickness of, 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 this Embodiment functions also as a layer which becomes the container outermost part when making a bag and making it into the pouch 1 among the laminated | multilayer films 30. FIG.

  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 container inner side. 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. Including widely. In particular, in the laminated film 30 used for the pouch 1 intended to contain food, characters indicating information such as a diagram of the content, a product name of the content, a shelf life, a manufacturing date, and a manufacturing number are used as a pattern. Is used. But the pattern layer 32 is laminated | stacked on the base material layer 31 according to the specification of goods, and the design layer 32 does not need to be provided in the base material layer 31. FIG.

  In the present embodiment, the pattern layer 32 is applied to the inner surface of the base material layer 31 instead of the outer surface of the base material layer 31 on the outer side of the container. In this case, since the pattern layer 32 is excellent in wear resistance, disappearance due to rubbing or the like can be effectively prevented, and alteration of the pattern can also be effectively prevented. Moreover, the base material layer 31 has transparency so that the pattern layer 32 laminated on the inner surface of the base material layer 31 can be visually recognized through the base material layer 31 when the pouch 1 is made by bag making. Preferably it is.

  As described above, the sealant layer 34 is provided in order to bond and seal the edges by heat-sealing the vicinity of the edges facing each other by overlapping the two laminated films 30. Moreover, in this Embodiment, the sealant layer 34 is arrange | positioned among the laminated | multilayer film 30 at the side which becomes the container innermost side when making a bag and making it the pouch 1. FIG.

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

  In particular, when the laminated film 30 is applied to the pouch 1 that requires heat resistance such as a pouch for a microwave oven, the sealant layer 34 includes an unstretched polypropylene layer (CPP layer) mainly containing unstretched 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, the impact resistance against dropping that may occur in the distribution process of the pouch 1 is excellent, and handling properties such as easy filling of contents and easy refilling of contents are also excellent.

  On the other hand, the intermediate layer 33 laminated between the base material layer 31 and the sealant layer 34 is provided in order to supplement various functions required for a microwave oven pouch. As described above, the pouch 1 is a pouch suitable for containing food as contents. For this reason, the intermediate layer 33 prevents vapor permeation and gas permeation of oxygen gas and the like so that the contents can be stored while preventing deterioration such as oxidation of the contents. It may have gas barrier properties. The standing pouch-type pouch 1 is displayed in a stand-alone state on a product shelf in the sales floor. The intermediate layer 33 may have bending resistance and impact resistance so that it can sufficiently withstand an impact or the like when the pouch 1 is dropped from the commodity shelf. In addition, the intermediate layer 33 may have a function of sufficiently improving the 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, saponified ethylene-vinyl acetate copolymer, and the like. These films, films obtained by coating polyvinylidene chloride on these films, films obtained by depositing inorganic substances such as silicon oxide and aluminum oxide, and films such as polyvinylidene chloride can be used. Further, one or more of these substrates may be used in combination.

  As shown in FIG. 2, in the present embodiment, a 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 known dry lamination method can be used. For example, a polyvinyl acetate adhesive, a polyacrylate adhesive, a cyanoacrylate adhesive An ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, an amino resin adhesive, an epoxy adhesive, a polyurethane adhesive, and the like can be used.

(Seal part)
The seal portion 50 is formed by heat-sealing the vicinity of the periphery of the pair of main sheet 11 and bottom sheet 21 made of the 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 isolates the first unsealed portion 60 and the second unsealed portion 70 located closer to the upper side of the pouch 1 from the housing 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 accommodation space 2 interposed therebetween. doing.

  The first unsealed portion 60 is provided to communicate with the accommodation space 2 and to release the steam in the pouch 1 to the outside when the pressure in the pouch 1 is increased by the steam generated with 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 accommodation 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. Yes. That is, the second unsealed portion 70 is provided to increase the manufacturing efficiency of the pouch 1. The second unsealed portion 70 reaches the side edge 13 of the main surface sheet 11 and opens. That is, the second unsealed portion 70 forms an opening 71 in the side edge 13 of the main surface sheet 11. Note that the second unsealed portion 70 is not necessarily 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 circumferential 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 in a circumferential shape while being spaced from the outer edge 50a.

  The seal portion 50 according to the present embodiment is positioned so as to face the first side seal portion 51 and the second side seal portion 52 that are located opposite to the horizontal direction d1 and the vertical direction d2 that is orthogonal to the horizontal direction d1. An upper seal portion (region surrounded by a two-dot chain line in FIG. 1) 53 and a lower seal portion 54 are included. Each of the side seal portions 51 and 52 is heat-sealed in the vicinity of the side edge 13 of the pair of main surface sheets 11, and the upper seal portion 53 is heat-sealed in 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 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 are separated 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 an upper seal portion 56 and a lower seal portion 57 positioned on both sides of the first unsealed portion 60 and the first unsealed portion 60. An overhanging portion 55 that is connected to the upper seal portion 56 and the lower seal portion 57 so as to surround the portion, and that protrudes toward the accommodation space 2 from the upper seal portion 56 and the lower seal portion 57. Contains. Among these, the upper seal portion 56 extends from the periphery of the first unsealed portion 60 along the vertical direction d2 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 d2 and is connected to the lower seal portion 54.

  As shown in FIG. 3, the overhang portion 55 includes an upper overhang region 55c extending from the upper seal portion 56 along the horizontal direction d1, and a lower portion extending from the lower seal portion 57 along the horizontal direction d1. It includes an overhang area 55d and a middle overhang area 55e interposed between the upper overhang area 55c and the lower overhang area 55d. In the example shown in FIG. 3, the intermediate overhang region 55 e extends along the vertical direction d <b> 2 at a position between the first unsealed portion 60 and the accommodation space 2. The middle overhang region 55e is connected to the upper 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 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 lower than the upper seal portion 56. It 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 accommodation space 2 functions to stably start peeling from the projecting portion 55 when heated in the microwave oven. In the example shown in FIG. 3, the upper corner region 55f and the lower corner region 55g have a sector 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 middle projecting region 55 e of the projecting portion 55 forms a step S <b> 1 with the upper seal portion 56. Accordingly, the inner edge 55 b of the overhang portion 55 is located closer to the accommodation space 2 than the inner edge 56 b of the upper seal portion 56. Further, a step S <b> 2 is formed between the middle projecting region 55 e of the projecting portion 55 and 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 middle overhang 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 scheduled 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 passes through 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. By forming the first notch 7a in the upper seal portion 56, it is possible to easily open the body 10 from the first notch 7a.

  FIG. 4 shows 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 positioned relatively near the upper edge 12 and a second lower seal portion positioned relatively close to the lower edge 14. 59. The inner edge 58b of the second upper seal portion 58 is located closer to the accommodation 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 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 that can serve as a starting point for opening. That is, the position where the second notch 7b is provided is another scheduled opening position CP2 when the body 10 is opened to take out the contents stored in the storage space 2. The second notch 7b shown in FIG. 4 penetrates through 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 body 10 can be easily opened from the second notch 7b.

  In addition, not only the notches 7a and 7b but various easy-opening means known per se can be provided at the scheduled opening positions CP1 and CP2. As an example of another easy-opening means, an example in which a plurality of fine small holes are provided in the upper seal portion 56 or the second upper seal portion 58 can be given. 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 mentioned above, the main surface sheet 11 and the bottom sheet 21 are composed of the same laminated film 30. Therefore, when the vicinity of the periphery of the laminated film 30 is heat-sealed under the same heat-sealing condition, the bonding force at any one point in the seal portion 50 is equal to the bonding force at the other point. For this reason, the ease of peeling of the seal part 50 when the pressure in the pouch 1 increases with heating greatly depends on the stress concentration induced by the position, shape, etc. of the seal part 50.

  In this regard, in the present embodiment, it is intended that the pair of main surface sheets 11 are peeled off from the overhanging portion 55 during heating by the microwave oven and the accommodation space 2 and the first unsealed portion 60 are communicated with each other. Yes. And in order to make it easy to peel the pair of main surface sheets 11 from the overhanging portion 55, the overhanging portion 55 overhangs the housing space 2 side with respect to the other portions 56, 57 of the first side seal portion 51, In addition, the lower corner region 55g is included. As a result of extensive research conducted by the present inventors, in order to more stably realize the progress of the separation of the pair of main surface sheets 11 from the overhanging portion 55, the first virtual straight line IL1 and the tension in FIG. The relationship indicating that a1 which is the length of the overlapping range with the protruding portion 55 is shorter than a2 which is the length of the overlapping range of the second virtual straight line IL2 and the second side seal portion 52 is satisfied. Has been found to be preferred. 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. In addition, about a1 which is the length of the range which 1st virtual straight line IL1 and the overhang | projection part 55 overlap, and a2 which is the length of the range which 2nd virtual straight line IL2 and the 2nd side part seal | sticker part 52 overlap. This 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, a load in a 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 part 50 with heating strongly depends on the positional relationship with the center O. First, a method for 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 sheet 11 and bottom sheet 21. For this reason, the outer edge of the accommodation space 2 is defined by the boundary with the surface of the pair of main surface sheet 11 and the bottom sheet 21 on the accommodation space 2 side.
Therefore, in the plan view, the outer edge of the accommodation space 2 includes the upper edge 2a defined at the boundary with the upper seal portion 53 in which the pair of main surface sheets 11 are joined, and the side seal in which the pair of main surface sheets 11 are joined. The side edge 2b defined at the boundary between the portions 51 and 52, and the lower edge 2c defined at the boundary between the main seal sheet 11 and the upper seal portion 53 joined to the bottom sheet 21. Yes. In particular, a point that is the center of the upper edge 2a of the accommodation space 2 is an upper middle point Y1, and a point that is the center of the lower edge 2c of the accommodation space 2 is a lower middle point Y2. That is, the upper middle point Y1 is a position that is the center of both ends 2a1, 2a2 of the upper edge 2a of the accommodation space 2, and the lower middle point Y2 is both ends 2c1, 2c2 of the lower edge 2c of the accommodation space 2. This is the center position of.

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

Next, the first virtual straight line IL1 that 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 overhanging portion 55 is defined as a1. To do.
Further, the second virtual straight line IL2 that 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 set. Let a2. As a result of extensive research conducted by the present inventors, it has been found that when the relationship of a1 <a2 is satisfied, the pair of main surface sheets 11 can be more stably separated from the overhang portion 55.

  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 sheet 11 progresses from the overhang | projection part 55 more stably. However, the present invention is not limited to the following estimation.

  As described above, a load in a direction from the center O toward each position is strongly received at each position of the seal portion 50 with heating. Therefore, in a range where the first virtual straight line IL1 that 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 that 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 Strongly received. Therefore, when the length a1 of the overlapping range 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 The portion 55 is less expensive to withstand the load. For this reason, the overhanging portion 55 is inferior in resistance to the load of the vapor pressure than the second side seal portion 52, and the accommodating space 2 and the second unsealed portion 70 are communicated with each other before the accommodating space 2 and the second unsealed portion 70 communicate with each other. 1 Since the unsealed portion 60 communicates, it is considered that the steam can be stably released from the overhang portion 55. In addition, it is considered that it is possible to easily prevent the peeling from proceeding from the seal portion 50 other than the overhang portion 55. In other words, it can be considered that it is possible to easily prevent the seal retreat from proceeding from the seal portion 50 other than the overhang portion 55.

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

  Next, the relationship between the dimensions and sizes 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 the length W of each position X on the inner edge 50b in a direction orthogonal to the extending direction of the seal portion 50 at the position X. As an example, the width W <b> 1 of the upper seal portion 56 is a length in a direction orthogonal to the extending direction of the upper seal portion 56 at each position on the inner edge of the upper seal portion 56. In each position on the inner edge of the upper seal portion 56, when the length in the direction orthogonal to the extending direction of the upper seal portion 56 at that position is not constant, the upper seal portion 56 is set as the width W1 of the upper seal portion 56. At each position on the inner edge, the largest value among the lengths in the direction orthogonal to the extending direction of the upper seal portion 56 at that position is adopted.

  Further, the width W3 of the overhang portion 55 is narrower 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 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 accommodating 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. 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 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, the length L5 of the second unsealed portion 70 in the lateral direction d1 is set to 1 to 3 mm, for example, The length L6 in the vertical direction d2 of the first unsealed portion 60 and the length L7 in the vertical direction d2 of the second unsealed portion 70 are set to 4 to 15 mm, for example.

  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 8 to 15 mm, for example, and the width W5 of the second lower seal portion 59 is set to 5 to 8 mm, for example.

  Furthermore, the magnitude | size of level | step difference S2 is set to 3-15 mm, for example, Preferably it is 7-12 mm. More specifically, the distance S2 in the lateral direction d1 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 is It is 3 m or more and 15 mm or less.

  However, the dimension or the magnitude relationship of each component constituting the pouch 1 is an example, and can be appropriately changed according to the specification.

  Note that 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, if the pouch has a size that is popular in the market, it 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 configured as described above will be described.

  When the pouch 1 is installed in the microwave oven and warmed, the moisture contained in the contents is warmed by the high frequency irradiated from the microwave oven, and the contents are heated. The moisture contained in the contents evaporates with heating, and the pressure in the pouch increases. In the present embodiment, the projecting portion 55 projects to the housing space 2 side with respect to 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 projecting portion 55 proceeds and the accommodation 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, portions of the body portion 10 that are in contact with the steam, such as portions other than the portion where the seal portion 50 is formed, are hot. On the other hand, the seal part 50 is not easily heated. In particular, according to the present embodiment, the width W 1 of the upper seal portion 56 is wider than the width W 2 of the lower seal portion 57. Therefore, the upper seal portion 56 is wider than the lower seal portion 57. For this reason, even if the upper seal portion 56 is picked with a finger, it is less likely to feel heat than when the lower seal portion 57 is picked with a finger. Therefore, the upper seal part 56 is pinched with a finger at a position above the first opening planned position CP1, and the body part 10 is opened from the first notch 7a provided in the upper seal part 56. Thereby, the content accommodated in the accommodation space 2 can be taken out, suppressing feeling of excessive heat.

  Next, a method for 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 of manufacturing the pouch 1 shown in FIG.

  As shown in FIG. 7, first, a body 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, and among these sheets 110 and 120. A region (excluding the upper seal portion 53) to be the seal portion 50 of each of the plurality of pouches 1 to be bag-formed is heat sealed. At this time, the region that is not heat-sealed in the body sheet 110 is a region that is heat-sealed into a region 111 that is to be the accommodation space 2 of each pouch 1 and a region 112 that is to be the first unsealed portion 60. 113. Thereafter, a plurality of pouches 1 are produced by cutting the heat-sealed region 113 in accordance with the shape of each pouch 1. By filling 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-sealing the vicinity of the upper edge 12 provided with the openings 4, the pouch 1 To seal.

  In this manufacturing method, when the region 112 to be the first unsealed portion 60 that is not heat-sealed is formed to be equal to the dimension of the first unsealed portion 60, the cutting between adjacent pouches 1 due to the processing accuracy If the position to be moved 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 in the lateral direction d1 of the region 112 to be the first unsealed portion 60 is set to be longer than the length in the lateral direction d1 of the first unsealed portion 60. 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, by providing the second unsealed portion 70 in each pouch 1, even if the cutting position between adjacent pouches 1 is shifted due to processing accuracy, the first unsealed portion of the pouch 1 is not. The opening 61 of the seal part 60 can be prevented from being blocked, and the pouch 1 can be manufactured continuously.

  As described above, according to the present embodiment, the laminated film 30 is separated from the housing space 2 by the side seal portion 51 and the side seal portion 51 that are heat-sealed, and closer to the upper side of the pouch 1. And the unsealed portion 60 reaches the side edge 13 of the stacked laminated film 30 to form an opening 61, and the side seal portion 51 is a 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 unsealed portion 60, and the upper seal portion 56 and the lower seal portion 57 located on both sides of the portion 60, and The upper seal portion 56 and the lower seal portion 57 projecting toward the housing space 2, and the projecting portion 55 is located on the lower seal portion 57 rather 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 narrower than the width W1 of the upper seal portion 56, after the heating in the microwave oven is finished, the upper seal portion 56 is The portion that is not heated is wider than the side seal portion 57. Therefore, when the pouch is opened by picking the upper seal portion 56 with a finger, it is possible to suppress 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. The accommodation space 2 can be secured widely.

  In addition, since the overhang portion 55 protrudes toward the accommodation space 2 rather than the upper seal portion 56 and the lower seal portion 57, when the pressure in the pouch 1 increases with heating by the microwave oven, It becomes easy to apply stress to the overhang portion 55 in a concentrated manner. For this reason, it is possible to start the peeling stably from the overhanging portion 55 and to reliably release the vapor in the pouch 1 from the first unsealed portion 60. Further, since the peeling easily proceeds from the overhanging portion 55, it is possible to suppress the peeling from proceeding from the seal portion 50 other than the overhanging portion 55.

  In addition, after heating in the microwave oven, the portion around the accommodation space 2 of the pouch 1 becomes hot and difficult to handle by hand. For this reason, when taking out the pouch 1 after a heating from a microwave oven and carrying it, the case where the pouch 1 is inclined unintentionally from the difficulty of handling is also assumed. 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 to the accommodation space 2 side from the upper seal portion 56 and the lower seal portion 57. Yes. That is, according to the pouch 1 according to the present embodiment, the contents can be prevented from leaking out of the pouch 1 from the opening 61 of the first unsealed portion 60 after heating in the microwave oven.

  Further, unlike the pouch described in Patent Document 1, it is not necessary to form a steam vent hole, so that there is no problem of inspection and recovery of the waste gas that 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, the width W3 of the overhang portion 55 is narrower than the width W2 of the lower seal portion 57. In this case, it contributes to making the protruding portion 55 easier to peel off than the lower seal portion 57. As a result, it is possible to easily prevent the peeling from proceeding from the seal portion 50 other than the overhang portion 55.

  Further, according to the present embodiment, the lateral direction between the portion z1 of the projecting portion 55 located closest to the accommodation space 2 and the portion z2 of the lower seal portion 57 located closest to the accommodation 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 is increased, stress is easily applied to the projecting portion 55 projecting from the opening 61 toward the accommodation space 2. As a result, it is possible to easily suppress the peeling from proceeding from the seal portion 50 other than the overhang portion 55.

Further, according to the present embodiment, the width W1 of the upper seal portion 56 is not less than 8 mm and not more than 15 mm. When the width W1 of the upper seal portion 56 is 8 mm or more, the upper seal portion 56 can be picked with a finger without feeling excessive heat after the heating in the microwave oven is finished.
On the other hand, when the width W1 of the upper seal portion 56 is 15 mm or less, it is possible to secure a wide accommodation space 2 for accommodating contents by using the laminated film 30 having a limited size.

  Further, according to the present embodiment, the overhang portion 55 includes the further upper corner region 55 f that protrudes toward the accommodation space 2 at a position closer to the upper seal portion 56 than the lower seal portion 57. It is out. In this case, since the step S1 is formed between the protruding portion 55 and the upper seal portion 56, the protruding portion 55 is likely to be adjacent to the accommodating space 2 in a wide range. For this reason, since the area which the overhang | projection part 55 peels can be enlarged and a vapor | steam can be made to escape in the state where the pressure in the pouch 1 does not become so high, it is excellent in safety.

  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, the width of the overhang portion 55 in the direction in which the first virtual straight line IL1 extends gradually increases as the distance from the center O of the virtual circle C increases, so that the overhang portion 55 can be easily peeled off. Thus, it is possible to easily prevent the peeling from proceeding from the seal portion 50 other than the overhang portion 55.

  Further, according to the present embodiment, the first side seal portion 51 is isolated 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. A second unsealed portion 70 in which an opening 71 is formed at the edge of the laminated film 30, and the first unsealed portion 60 and the second unsealed portion 70 are arranged across the accommodation space 2. It is located facing the direction d1. In this case, even if the cutting position between the 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 the other pouch 1 is blocked. It can be prevented from being peeled off.

  Further, according to the present embodiment, 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 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 and the second unsealed portion 70 of the other pouch 1 are connected. Even if the cutting position between adjacent pouches 1 is shifted due to 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 is desired. Can be maintained. For this reason, the tolerance of the manufacturing error of the pouch 1 can be improved, and as a result, it contributes to manufacturing the pouch 1 efficiently.

Here, from the viewpoint of more reliably proceeding the 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 with heating by the microwave oven, the possibility that the pouch 1 breaks the bag can be reduced. The seal strength in the pair of principal surface sheets 11 at the overhanging 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 with heating by the microwave oven, the peeling is surely started from the overhang 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 overhanging portion 55 is 30 N / 15 mm or less at 100 ° C. The seal strength here refers to a seal strength value (N / 15 mm) measured in accordance with JISZ0238. When the width of the sample piece cannot be secured to 15 mm, a sample piece with 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 mm). ) Is used 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 that extend 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 portion 63 and the second edge portion 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 in parallel with 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-shaped shape. In the present embodiment, the length of the third edge 65, that is, the length L6 of the first unsealed part 60 in the vertical direction d2 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 a substantially V-shaped shape. In other words, the edge portion 62 of the first unsealed portion 60 is composed of only the first edge portion 63 and the second edge portion 64 extending from the periphery of the opening 61 toward the accommodation space 2, and the tip of the first edge portion 63. A form in which the tip of the second edge 64 is overlapped is also conceivable. Such an example is shown in FIG.

  Note that the shape of the first unsealed portion 60 is not limited to the example illustrated in FIGS. 3 and 8. 9 and 10 show another example of the shape of the first unsealed portion 60. FIG. Among these, in the example illustrated 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 so that the end connected to the first edge 63 is located on the side away from the accommodation space 2 in the lateral direction d1 from the end connected to the second edge 64. doing.

  In the example illustrated in FIG. 10, the first unsealed portion 60 has a parallelogram shape in plan view. Specifically, the first edge 63 and the second edge 64 are inclined downwardly with respect to the horizontal direction d1 from the opening 61 and extend linearly. The length of the first edge 63 is equal to the length of the second edge 64. Therefore, the third edge 65 extends in parallel with the up-down 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 above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  The form of the 1st side part seal part 51 in embodiment mentioned above is an example, and can add various change. 11 to 13 show another example of the form of the first side seal portion 51. Among these, in the example shown in FIG. 11, the width W <b> 1 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 from the upper seal portion 56 so as to incline downward with respect to the horizontal direction d1, and from the lower seal portion 57 along the horizontal direction d1. The upper overhang region 55c is connected via the lower overhang region 55d and the lower corner region 55g. The lower corner region 55 g protrudes toward the accommodation space 2 at a position closer to the lower seal portion 57 than the upper seal portion 56.

  Moreover, in embodiment mentioned above, as shown in FIG. 1, although the pouch 1 showed the example which consists of a standing type pouch formed by heat-sealing the trunk | drum 10 and the bottom part 20, the form of a pouch was shown. 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. An example of another form of the pouch 1 is shown in FIGS.

  Among these, in the example shown in FIG. 13, it is what is called a four-side seal flat pouch 1. The four-side sealed flat pouch 1 shown in FIG. 13 is made from only a pair of main surface sheets 11 and does not use the bottom 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-way seal flat pouch 1. The three-way flat pouch 1 shown in FIGS. 14 and 15 is manufactured 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 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. Note that 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.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to this Example. As described below, pouches according to Examples 1 to 3 and Comparative Examples 1 to 4 were produced, and the steam venting function, the opening characteristics, and the internal volume were evaluated.

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

  The body sheet that forms the body part and the bottom material sheet that forms the bottom part are arranged at predetermined positions, and an area (upper seal) to be a seal part of each pouch to be bag-made among these sheets. Except for the area to be part). At this time, a region of the body sheet that was not heat-sealed was divided into a region that was to be an accommodation space for each pouch and a region that was to be the first unsealed portion by the heat-sealed region. Thereafter, a plurality of pouches were produced by cutting the heat-sealed portion according to the shape of each pouch. After the prepared pouch was filled with 100 grams of water as the contents, the vicinity of the upper edge of the stacked main sheet was heat-sealed to seal the pouch. Thus, the pouch which concerns on Examples 1-3 was produced, respectively.

  The dimensions of each part of the manufactured pouches according to Examples 1 to 3 were as shown in FIG. For each of the pouches according to Examples 1 to 3, the values of W1, W2, W7, W8, and S2 shown in FIG. In addition, the dimension of each part is a mm unit.

(Comparative example)
The pouches according to Comparative Examples 1 to 4 correspond to the forms in which at least one of the dimensions of W1, W2, W7, W8, and S2 is changed with respect to the pouches according to Examples 1 to 3. Therefore, the pouches according to Comparative Examples 1 to 4 were produced by the same manufacturing method as the pouches according to Examples 1 to 3 using the same material 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, W1 is 16 mm, W2 is 6 mm, and S2 is 10 mm. Therefore, the inner edge of the upper seal portion and the inner edge of the overhang portion are positioned on the same straight line.

(Evaluation results)
Table 1 shows the evaluation results of evaluating the steam venting function, usability, internal capacity and filling suitability for the pouches according to Examples 1 to 3 and Comparative Examples 1 to 4 obtained above. Among these, the evaluation of the steam venting function was carried out by putting each sealed pouch in a microwave oven and heating at 600 W for 2 minutes, and visually confirming whether steam escaped from the first unsealed part during heating, and sealing part after heating This was done by inspecting for the occurrence of peeling. In the column of the evaluation result of the steam release 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 sealed portion after heating is peeled off and other than the overhanging portion. The case where the occurrence of peeling was not confirmed in the region was marked as ◯. On the other hand, the case where vapor escape from the first unsealed portion could not be confirmed during heating, or the case where progress of peeling was confirmed from a region other than the overhanging portion of the sealed portion after heating was marked as x.

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

(Internal capacity)
The internal capacity was evaluated by comparing the size of the storage space for storing the contents. In the column of the evaluation result of the internal capacity in Table 1, it was marked as “◯” when it was determined that the size of the accommodation space was comparable to that of the pouch for microwave ovens distributed in the market. On the other hand, when the size of the accommodation space is small compared with the microwave oven pouches that are distributed in the market, it is determined that the market is not competitive.

(Filling suitability)
Evaluation of filling suitability was performed by evaluating suitability when filling a pouch with 100 grams of water as the contents before heat sealing the vicinity of the upper edge of the main surface sheet. In the column of the evaluation result of filling suitability in Table 1, “◯” was given when the filling suitability was superior to that of the pouch according to Comparative Example 3.

  In the pouches according to Examples 1 to 3, steam escaped from the first unsealed portion while warming in the microwave oven. After the heating, the presence or absence of peeling of the seal portion was inspected. As a result, only the protruding portion of the seal portion was peeled off, and no occurrence of peeling was confirmed in the region other than the protruding portion. Moreover, even if the upper seal part was picked with a finger immediately after the heating in the microwave oven was finished, the pouch could be opened quickly without feeling excessive heat. Furthermore, the filling ability of the contents was also excellent. Therefore, the pouches according to Examples 1 to 3 have a steam venting function, are excellent in filling ability of contents, and can be opened quickly even after warming in a microwave oven.

  In the pouch according to Comparative Example 1, when the upper seal portion was picked with a finger immediately after the heating in the microwave oven was over, excessive heat was felt and the pouch could not be opened quickly. For this reason, since the pouch according to Comparative Example 1 is not suitable for use as a pouch for a microwave oven, the evaluation of the unsealing property was x.

  In the pouch according to Comparative Example 2, it was judged that the size of the accommodation space was small compared with the pouch for microwave ovens distributed in the market, and the market was not competitive. For this reason, since the pouch according to Comparative Example 2 cannot be provided at a competitive price in the market, the evaluation of the internal capacity is x.

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

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

DESCRIPTION OF SYMBOLS 1 Pouch 2 Storage space 2a Upper edge 2c Lower edge 7 Notch 10 Trunk 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 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 (4)

A pouch that is made by heat-sealing the laminated film that has been stacked and has a storage space for storing contents,
A side seal part obtained by heat-sealing the laminated film, and
An unsealed portion that is isolated from the accommodation space by the side seal portion and is not heat-sealed by the laminated film that is stacked;
Have
The unsealed part is located near the upper side of the pouch, and reaches the side edge of the laminated film that has been stacked, and opens.
The side seal portion includes an upper seal portion and a lower seal portion located on both sides of the unsealed portion, and the upper seal portion and the lower seal so as to surround at least a part of the unsealed portion. And a projecting portion that is connected to the housing space side of the upper seal portion and the lower seal portion.
In plan view, from the center of the virtual circle centered at the center of the upper middle point that is the center of the upper edge of the housing space and the lower middle point that is the center of the lower edge of the housing space, When a virtual straight line that is the shortest distance to the unsealed portion is drawn, the length of the overlapping range of the virtual straight line and the protruding portion is a1, and the width of the lower seal portion is W2, a1 <Satisfies the relationship of W2,
The overhang portion includes an angular region that forms an acute angle;
A pouch in which a portion corresponding to the corner region of the edge portion of the unsealed portion also forms an acute angle . The overhang includes a corner region;
The pouch according to claim 1, wherein the virtual straight line overlaps the overhanging portion in the corner region.   A lateral distance between a portion of the projecting 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. Item 3. A pouch according to Item 1 or 2.   The pouch according to any one of claims 1 to 3, wherein an inner edge of the protruding portion is located closer to the accommodation space than an inner edge of the upper seal portion.

Images