JP2020055570A - Pouch - Google Patents

Abstract

To provide a pouch that can stand in unsupported manner, and is hardly restricted by the height of the inside of a microwave oven and can easily release steam when heated in the microwave oven.SOLUTION: According to one embodiment of the present invention, a pouch 10 is provided in which: each of a first section 21A and a second section 21B includes an extending section 26 having a respective inner edge 26A, 26B which is located to a center section 10E side from a slope 25 and extends in a first direction DR1 orthogonal to a lateral edge 10F of the pouch 10; a first fold section 20 has a bulge section 24 that bulges from the first section 21A and the second section 21B of a first bottom seal part 21 toward an accommodation space 10A; and the bulge section 24 has an overhanging seal section 27 and a second unsealed section 28; the pouch is configured such that steam is released from between a front surface 11 and a first section 13A of a bottom surface 13 when the overhanging seal part 27 is peeled, and a second fold section 30 having no steam releasing mechanism.SELECTED DRAWING: Figure 1

Description

  The present invention relates to pouches.

  2. Description of the Related Art Conventionally, in stores, standing-type pouches that can be used to make their presence stand out and to heat the contents with a microwave oven have been widely used. Such pouches are usually placed in a microwave oven while standing independently.

  At present, a large-capacity self-supporting pouch is required, but the height of the pouch is designed so that the height of the pouch is lower than the height of the inside of the microwave oven from the viewpoint of preventing falling. . It is possible to obtain a large-capacity self-supporting pouch by increasing the lateral dimension without changing the height dimension of the pouch, but usually, the steam generated by heating in a microwave oven is reduced. Since the steam venting mechanism for automatically releasing the air to the outside of the pouch is provided on the side of the pouch, there is a problem that if the lateral dimension is increased, the steam venting mechanism becomes difficult to function.

  On the other hand, a standing-type pouch having a bottom seal portion formed between a front surface or a back surface and a bottom surface with an easily peelable opening film in a tape shape is known (see Patent Document 1). ). In such a pouch, it is possible to make the pouch stand alone, but when heating in a microwave oven, the bottom seal portion functions as a steam venting mechanism, so that the pouch can be heated in a horizontal state.

JP 2004-250046 A

  However, in the case of a pouch in which the contents are heated by a microwave oven with the back side of the pouch facing down, steam generated at the time of heating may be difficult to escape.

  The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a pouch that is self-supporting, is not easily restricted by the height of the inside of a microwave oven when heating in a microwave oven, and easily releases steam.

The present invention includes the following inventions.
[1] It is composed of a packaging material having at least a base material layer and a sealant layer, and has a front surface, a back surface facing the front surface, and is located between the front surface and the back surface, And a pouch having a bottom surface having a first portion and a second portion connected to each other via a folding line, and a housing space, wherein the pouch has a pair of side portions and a first side portion formed on one of the side portions. A seal portion, a second side seal portion formed on the other side portion, and a first portion of the front surface and the bottom surface are formed by joining the first portion and the first side seal portion. A first fold portion located below, and a second fold portion formed by joining the second portion of the back surface and the bottom surface and located below the second side seal portion; A first fold portion having a first bottom seal portion and a first unsealed portion; A bottom portion having a second bottom seal portion, and joining the sealant layer on the front surface and the sealant layer on the back surface at a side portion of the first fold portion and a side portion of the second fold portion. The first bottom seal portion is divided into a first portion and a second portion via the first unsealed portion, and the first bottom seal portion is formed by the first bottom seal portion. The first portion and the second portion are respectively inclined portions that are inclined downward from the side portions of the pouch toward the central portion, and are located closer to the central portion side than the inclined portions, and are closer to the pouch side. An extending portion having an inner edge extending along a first direction orthogonal to an edge, wherein the second bottom seal portion includes an inclined portion inclined downward from the side portion of the pouch toward the central portion. , The first fold portion is the first bottom seal portion, A protruding portion protruding from the second portion and the second portion toward the housing space, wherein the protruding portion includes the extending portion and the first bottom portion in the first portion of the first bottom seal portion. A protruding seal portion connected to the extending portion in the second portion of the seal portion; and a second unsealed portion communicating with the first unsealed portion on an outer edge side of the protruding seal portion. When the overhanging seal portion is peeled off, the steam is released from between the front surface and the first portion of the bottom surface, and the second fold portion is not provided with a steam release mechanism. , Pouch.

[2] The pouch according to the above [1], wherein a ratio of a distance from the folding line to an inner edge of the extending portion with respect to a height of the pouch is 0.7 or more.

[3] The pouch according to the above [1] or [2], wherein a ratio of a length of the extending portion to a distance from the folding line to an inner edge of the extending portion is 0.3 or more.

[4] The inner edge of the overhang seal portion includes a first inner edge closest to the accommodation space side, and second inner edges connected to both ends of the first inner edge, and the second inner edge is The pouch according to any one of [1] to [3], wherein the pouch is inclined downward.

[5] The first unsealed portion is formed between the packaging material forming the front surface and the packaging material forming the first portion of the bottom surface, and an outer edge of the first unsealed portion. The pouch according to any one of [1] to [4], wherein an outer edge of the first bottom seal portion is located on a same straight line or a same curve.

[6] An opening start means formed on at least one of the first side seal portion and the second side seal portion and provided at a position lower than a half height of the pouch is further provided. The pouch according to any one of the above [1] to [5].

[7] A content is accommodated in the accommodation space of the pouch, and the pouch further has an upper seal portion formed by joining the front surface and the rear surface at an upper portion of the pouch, wherein the upper seal portion is provided. The pouch according to any one of the above [1] to [6], wherein the pouch is formed so as to extend from the first side seal portion to the second side seal portion along the first direction. .

  According to the present invention, it is possible to provide a pouch that is self-supporting, is not easily restricted by the height of the inside of a microwave oven when heating in a microwave oven, and can easily release steam.

It is a front view of the pouch concerning an embodiment. FIG. 2 is a rear view of the pouch according to the embodiment. FIG. 2 is an exploded view of the pouch according to the embodiment. FIG. 2 is a view for explaining dimensions of each component of the pouch shown in FIG. 1. It is the figure which expanded the overhang | projection part vicinity of the pouch shown in FIG. FIG. 6 is a diagram for explaining dimensions of each component of the overhang shown in FIG. 5. It is sectional drawing of the packaging material used for a pouch. It is a figure showing other shapes of the overhang part of the pouch concerning an embodiment. FIG. 2 is a perspective view showing a state in which the pouch shown in FIG. 1 is self-standing. FIG. 2 is a diagram showing a state where the pouch shown in FIG. 1 is placed in a microwave oven and heated. FIG. 11A is a front view of the pouch according to Comparative Example 1, and FIG. 11B is an enlarged view of the vicinity of the overhang portion of the pouch shown in FIG.

  Hereinafter, a pouch according to an embodiment of the present invention will be described with reference to the drawings. In this specification, terms such as “film” and “sheet” are not distinguished from each other based only on the difference in names. Therefore, for example, “film” is used in a sense that includes a member that is also called a sheet. In addition, the positions of “up”, “down”, “side”, and “bottom” in this specification mean positions in a state where the pouch is self-standing. FIG. 1 is a front view of the pouch according to the embodiment, FIG. 2 is a rear view of the pouch according to the embodiment, and FIG. 3 is an exploded view of the pouch according to the embodiment. 4 is a view for explaining the dimensions of each component of the pouch shown in FIG. 1, FIG. 5 is an enlarged view of the vicinity of the overhang of the pouch shown in FIG. 1, and FIG. FIG. 4 is a diagram for explaining dimensions of each component of the overhang shown in FIG. 7 is a cross-sectional view of a packaging material used for the pouch, FIG. 8 is a view showing another shape of the overhang portion of the pouch according to the present embodiment, and FIG. 9 is a diagram showing the pouch shown in FIG. FIG. 10 is a perspective view showing a state in which the pouch shown in FIG. 1 is placed in a microwave oven and heated.

<<<< Pouch >>>>
The pouch 10 shown in FIG. 1 is a standing-type pouch, and has a storage space 10A for storing contents. The contents are not particularly limited, but include solids, liquids, and mixtures thereof. Examples of the contents include retort foods, frozen foods and refrigerated foods. Foods include curry, porridge, yakisoba, side dishes, fish and the like. The term “pouch” is a concept including not only a pouch in which contents are not filled but also a pouch in which contents are filled.

  The pouch 10 shown in FIG. 1 has a front surface 11, a back surface 12 (see FIG. 2), and a bottom surface 13. The front surface 11 and the back surface 12 have a rectangular outline. The bottom surface 13 is folded in two, and has a first portion 13A and a second portion 13B via a fold line 13C. As shown in FIG. 3, the bottom surface 13 is provided with four semicircular notches 13D so as to cut out side edges, and the notch 13D of the first portion 13A is It is provided at a position corresponding to the notch 13D.

  As shown in FIG. 3, the pouch 10 includes three packaging materials: a packaging material 40 forming the front surface 11, a packaging material 40 forming the back surface 12, and a packaging material 40 forming the bottom surface 13. Have been. However, the pouch may be composed of one or two packaging materials as long as it can be self-supporting.

  As shown in FIGS. 1 and 2, the pouch 10 has a first side seal portion 14 formed on the first side portion 10B and a second side portion 10C formed on the second side portion 10C opposed to the first side portion 10B. A second side seal portion 15, an opening start means 16 provided on the first side seal portion 14 and the second side seal portion 15, and a first fold 20 located below the first side seal portion 14. And a second fold portion 30 located below the second side seal portion 15. In FIG. 1, the upper part of the pouch 10 is open, but after the contents are filled in the accommodation space 10A, the pouch 10 is joined and joined to form an upper seal surrounded by an upper edge 10D and a two-dot chain line in FIG. An upper seal portion is formed in the portion planned region R, and the pouch 10 is sealed.

<< First side seal portion and second side seal portion >>
The first side seal portion 14 is a portion where the front surface 11 and the back surface 12 are joined to each other in the first side portion 10B, and is formed from the fold line 13C to the upper edge 10D of the pouch 10. The second side seal portion 15 is a portion where the front surface 11 and the back surface 12 are joined to each other in the second side portion 10C, and is formed from the fold line 13C to the upper edge 10D of the pouch 10. The bonding of the front surface 11 and the back surface 12 at the time of forming the first side seal portion 14 and the second side seal portion 15 is performed by heat sealing (thermal fusion).

  The width W1 (see FIG. 4) of the first side seal portion 14 and the second side seal portion 15 is preferably, for example, 2 mm or more and 15 mm or less. When the width W1 of each of the first side seal portion 14 and the second side seal portion 15 is 2 mm or more, the first side seal portion 14 and the second side seal portion 15 can be reliably sealed. If it is 15 mm or less, the accommodation space 10A can be secured more widely. In this specification, the “width” of each seal portion means a length in a direction orthogonal to a direction in which the seal portion extends. When the width of the seal portion is not constant, the width of the seal portion is set to the shortest value among the lengths in the direction orthogonal to the direction in which the seal portion extends. Further, the dimensions of the pouch and the dimensions of each component constituting the pouch in this specification are all in a state in which the first and second portions of the bottom surface are in contact with each other, that is, in a state where the pouch is substantially flat without being spread. And the value measured in. The lower limit of the width W1 is more preferably 4 mm or more, and the upper limit is more preferably 10 mm or less.

  The distance D1 (see FIG. 4) between the lower end 14A1 of the inner edge 14A of the first side seal portion 14 and the lower end 15A1 of the inner edge 15A of the second side seal portion 15 may be 80 mm or more and 300 mm or less.

<< Opening start means >>
The opening start means 16 can serve as a starting point when opening the pouch 10, and is half the height H1 (see FIG. 4) of the pouch 10 in the first side seal portion 14 and the second side seal portion 15. It is provided at a position lower than the position (on the first fold 20 side). When the opening start means 16 is provided in the first fold and the second fold, it is difficult to open this portion because four wrapping materials are overlapped. On the other hand, since the opening start means 16 is provided in the first side seal portion 14 and the second side seal portion 15 where the two packaging materials 40 overlap, the opening can be easily performed. Also, when opening the pouch, since the position of the overhanging seal portion is a steam port through which steam escapes, the pouch is opened with the bottom side facing upward, but the opening start means is more than half the height of the pouch. Also when provided at the upper position, when the bottom side of the pouch is set to the upper side, the opening start means is located at a position lower than half the height of the pouch, so when opening from the opening start means, Contents may leak. On the other hand, the opening start means 16 is provided at a position lower than a half position of the height H1 of the pouch 10 (see FIG. 4). Hateful.

  The opening start means 16 may be a notch or a notch. The opening start means 16 shown in FIG. 1 is cut. The opening start means 16 is formed on the first side seal portion 14 and the second side seal portion 15, but the opening start means is formed only on the first side seal portion or only on the second side seal portion. May be.

<< First fold and second fold >>
The first fold 20 and the second fold 30 are portions for forming a bottom gusset. By forming the bottom gusset portion, the pouch 10 can be made independent and the accommodation space 10A can be enlarged, so that a larger or more content can be accommodated.

  The first fold portion 20 is formed by joining the front surface 11 and the first portion 13A of the bottom surface 13 to each other, and the second fold portion 30 connects the back surface 12 and the second portion 13B of the bottom surface 13 to each other. It is formed by joining. The joining of the front surface 11 and the first portion 13A of the bottom surface 13 when forming the first fold 20 and the joining of the back surface 12 and the second portion 13B of the bottom 13 when forming the second fold 30 This is performed by heat sealing (thermal fusion). The first fold 20 and the second fold 30 may be, for example, rectangular.

  The first fold portion 20 has a first bottom seal portion 21, a first unsealed portion 22, a first air vent hole 23, and an overhang portion 24 to which the first portion 13A of the front surface 11 and the bottom surface 13 are joined. The second fold portion 30 has a second bottom seal portion 31 to which the front portion 11 and the second portion 13B of the bottom surface 13 are joined, and a second air vent hole 32. The second fold portion 30 does not have the first unsealed portion or the overhang portion. The first air vent hole 23 is provided in the first bottom seal part 21 so as to be surrounded by the first bottom seal part 21, and the second air vent hole 32 is provided so as to be surrounded by the second bottom seal part 31. Although provided in the seal portion 31, the first air vent hole 23 and the second air vent hole 32 need not be provided.

  A part of the side part 20A of the first fold part 20 and a part of the side part 30A of the second fold part 30 constitute a later-described sealant layer 42 and a back surface 12 of the packaging material 40 constituting the front surface 11. It is joined by the third bottom seal part 17 formed by joining the sealant layer 42 of the packaging material 40. Bonding of the sealant layer at the time of forming the third bottom seal portion 17 is performed by heat sealing (thermal fusion). The first fold 20 has the overhang 24 so that steam can be vented as described later. However, the second fold 30 has no vapor vent mechanism.

  The ratio (W2 / H1) of the width W2 (see FIG. 4) of the first fold 20 to the height H1 (see FIG. 4) of the pouch 10 may be 0.1 or more and 0.5 or less. The lower limit of W2 / H1 is preferably 0.2 or more, and the upper limit is preferably 0.4 or less. If W2 / H1 is 0.2 or more, more contents can be accommodated. If W2 / H1 is 0.4 or less, the pouch 10 can be made to stand more stably and independently. The ratio of the width of the second fold 30 to the height H1 of the pouch 10 may be 0.1 or more and 0.5 or less. For the same reason as described above, the lower limit of W3 / H1 is preferably 0.2 or more, and the upper limit is preferably 0.4 or less. The width W2 of the first fold 20 and the width W3 of the second fold 30 are lengths in the second direction DR2 (see FIGS. 1 and 4) in which the side edge 10F of the pouch 10 extends. Specifically, it is the length from the folding line 13C to the lower edge of the pouch 10.

  The width W2 of the first fold 20 and the width W3 of the second fold 30 are preferably 15 mm or more and 60 mm or less. If the width W2 and the width W3 are each 15 mm or more, more contents can be accommodated. Further, if the width W2 and the width W3 are equal to or less than 60 mm, the pouch 10 can stably stand alone. The lower limits of the width W2 and the width W3 are more preferably 25 mm or more, respectively, and the upper limits are more preferably 50 mm or less.

<First bottom seal portion and second bottom seal portion>
As shown in FIG. 1, the first bottom seal part 21 is divided into a first part 21A and a second part 21B via a first unsealed part 22. The first portion 21A and the second portion 21B of the first bottom seal portion 21 are orthogonal to the inclined portion 25 inclined downward from the side portions 10B and 10C of the pouch 10 toward the central portion 10E and the side edge 10F of the pouch 10. And an extending portion 26 having inner edges 26A and 26B extending along a first direction DR1 (see FIG. 1). As shown in FIG. 2, the second bottom seal portion 31 also includes an inclined portion 33 inclined downward from the side portions 10B and 10C of the pouch 10 toward the central portion 10E and an inner edge 34A extending along the first direction DR1. Including the extending portion 34.

(Slope)
The inclined portions 25 and 33 are portions inclined downward from the side portions 10B and 10C of the pouch 10 toward the central portion 10E. Since the first portion 21A and the second portion 21B of the first bottom seal portion 21 each include the inclined portion 25, and the second bottom seal portion 31 includes the inclined portion 33, the contents are gathered at the central portion 10E of the pouch 10. Therefore, the pouch 10 can be made to stand more independently.

  The inclined portions 25, 33 may have the inner edges 25A, 33A inclined downward from the side portions 10B, 10C of the pouch 10 toward the central portion 10E, but from the viewpoint of more easily releasing steam, The angle α (see FIG. 1) formed between the inner edge 14A of the first side seal portion 14 and the inner edge 25A of the inclined portion 25 of the first portion 21A, and the inclined portion of the inner edge 15A of the second side seal portion 15 and the second portion 21B. It is preferable that the angle β (see FIG. 1) formed by the inner edges 25A of the respective 25 is not more than 60 °.

(Extended part)
The extending portion 26 is located closer to the center of the pouch 10 than the inclined portion 25. The extending portion 26 shown in FIG. 1 is connected to the inclined portion 25. The ratio (L1 / D2) of the length L1 (see FIG. 4) of the extension portion 26 in the first portion 21A to the distance D2 (see FIG. 4) from the fold line 13C to the inner edge 26A of the extension portion 26 is 0.30. It is preferable that it is above. The ratio (L1 / D2) of the length L1 (see FIG. 4) of the extending portion 26 in the second portion 21B to the distance D2 (see FIG. 4) from the folding line 13C to the inner edge 26B of the extending portion 26 is 0. If L1 / D2 is preferably 0.30 or more and 0.30 or more, stress tends to concentrate on the overhanging seal portion 27 when the pressure in the pouch 10 increases with heating by the microwave oven. Easier to vent. The lower limit of L1 / D2 is more preferably 0.40, 0.50 or more (the larger the numerical value, the better). The upper limit of L1 / D2 may be 10.0 or less.

  The ratio (L1 / D1) of the length L1 of the extending portion 26 to the distance D1 between the lower end 14A1 of the inner edge 14A of the first side seal portion 14 and the lower end 15A1 of the inner edge 15A of the second side seal portion 15 is It may be 0.10 or more. L1 / D1 is preferably 0.15 or more and 0.20 or more (the larger the value, the better). When L1 / D1 is 0.15 or more, steam can be more easily removed. The upper limit of L1 / D1 may be 0.4 or less.

  The length L1 of the extending portion 26 in each of the first portion 21A and the second portion 21B is preferably 10 mm or more from the viewpoint of more easily releasing steam. In addition, the total of the length L1 of the extending portion 26 in the first portion 21A and the length L1 of the extending portion 26 in the second portion 21B is preferably 20 mm or more from the viewpoint of easier vapor release. The width W4 (see FIG. 4) of the extending portion 26 in the first portion 21A and the second portion 21B is preferably 5 mm or more and 15 mm or less. If the width W4 is 5 mm or more, the extension portion 26 can be reliably sealed. If the width W4 is 15 mm or less, the accommodation space 10A can be secured wider and can be easily self-supported.

<Third bottom seal part>
The third bottom seal part 17 is a part for joining a part of the side part 20A of the first fold part 20 and a part of the side part 30A of the second fold part 30 to each other. The third bottom seal portion 17 is formed by joining the front surface 11 and the back surface 12 through a notch 13D provided on the bottom surface 13. From the viewpoint of expanding the gusset fold when filling the content space into the accommodation space, the first fold and the second fold need to be separated at the center of the bottom of the pouch. If the second fold is completely separated, the first fold and the second fold cannot bear the weight of the content when the storage space is filled with the content, and the first fold and the second fold are not. There is a possibility that the space between the pouches will open, making it difficult for the pouch to become independent. In addition, since the base layers described below cannot be heat-sealed, the first fold and the second fold where the base layers face each other cannot be heat-sealed as they are. For this reason, by forming the third bottom seal portion 17, only a part of both side portions 20A and 30A of the first fold portion 20 and the second fold portion 30 is joined. Accordingly, when filling the contents, the pouch 10 can be stably self-supported without hindering the spread of the bottom surface 13.

<First unsealed part>
The first unsealed portion 22 is a portion that is located between the first portion 21A and the second portion 21B and is not sealed. The first unsealed portion 22 is formed between the packaging material 40 forming the front surface 11 and the packaging material 40 forming the first portion 13A of the bottom surface 13. That is, the first unsealed portion 22 is sandwiched between the two packaging materials 40. However, the first unsealed portion does not have to be sandwiched by the packaging material 40 by punching two sheets of the packaging material 40 sandwiching the first unsealed portion 22.

  The first unsealed portion 22 is connected to a second unsealed portion 28 described later. When the first unsealed portion 22 is formed between the packaging material 40 forming the front surface 11 and the packaging material 40 forming the first portion 13A of the bottom surface 13, as shown in FIG. The outer edge 22A of the first unsealed portion 22 and the outer edge 21C of the first bottom sealed portion 21 may be located on the same straight line. In this case, the outer edge of the first unsealed portion means a lower edge of a portion corresponding to the first unsealed portion in the packaging material forming the front surface. That is, the lower edge of the front surface 11 is formed by the outer edge 21 </ b> C of the first bottom seal portion 21 and the lower edge of the portion corresponding to the first unsealed portion 22 in the packaging material 40 forming the front surface 11. It is configured. If both the outer edge of the first unsealed portion and the outer edge of the first bottom sealed portion are curved, they may be located on the same curve.

  A width W5 (see FIG. 6) of the first unsealed portion 22 in a first direction DR1 orthogonal to the side edge 10F of the pouch 10 is equal to or longer than a length L2 described later. Since the width W5 is equal to or longer than the length L2, steam is easily released. If the width W5 is not constant, the width W5 is set to the shortest value among the lengths in the first direction DR1. The width W5 of the first unsealed portion 22 is not particularly limited as long as it is equal to or longer than the length L2, but is preferably, for example, 10 mm or more and 30 mm or less. If the width W5 is 10 mm or more, the clogging of the steam port can be suppressed, and if it is 30 mm or less, the drop impact resistance does not deteriorate.

<Overhang part>
The projecting portion 24 is a portion projecting from the first portion 21A and the second portion 21B of the first bottom seal portion 21 toward the accommodation space 10A. The overhang 24 shown in FIG. 1 has a substantially triangular shape. It is preferable that the overhang portion 24 is formed below the folding line 13C from the viewpoint of accommodating more contents. The overhang portion 24 has an overhang seal portion 27 and a second unsealed portion 28.

Area S1 of the overhang portion 24 (area of the region surrounded by the inner edge 27A of the two-dot chain line and the swollen seal portion 27 shown in FIG. 6), it is preferable that a 20 mm ² or more 700 mm ² or less. If the area S1 is 20 mm ² or more, when the increased pressure within the pouch 10 with the microwave heating, stress is easily concentrated in the projecting seal portion 27, also if the 700 mm ² or less, the vapor Can be discharged stably.

(Overhang seal part)
The overhang seal portion 27 is a portion where the front surface 11 and the first portion 13A of the bottom surface 13 are joined. The joining of the first portion 13A of the front surface 11 and the bottom surface 13 at the time of forming the overhanging seal portion 27 is performed by heat sealing (thermal fusion). As shown in FIG. 5, the overhanging seal portion 27 is connected to the first portion 21 </ b> A of the bottom seal portion 21 and the second portion 21 </ b> B of the first bottom seal portion 21. By forming the overhanging seal portion 27, the pouch 10 is peeled off when the pressure in the pouch 10 reaches a predetermined pressure due to heating by the microwave oven, and the accommodating space 10A, the second unsealed portion 28, and the first unsealed portion. The seal portion 22 communicates, whereby the steam in the housing space 10A is automatically released from between the front surface 11 and the first portion 13A of the bottom surface 13.

  The overhanging seal portion 27 extends beyond the first portion 21A and the second portion 21B of the first bottom seal portion 21 toward the housing space 10A. Therefore, when the pressure in the pouch 10 increases due to heating by the microwave oven, stress tends to concentrate on the overhanging seal portion 27. In addition, since the peeling easily progresses from the overhanging seal portion 27, the progress of the peeling from the first side seal portion 14, the second side seal portion 15, and the upper seal portion can be suppressed.

  As shown in FIG. 5, the inner edge 27A of the overhanging seal portion 27 and the inner edge 21AA of the first portion 21A of the first bottom seal portion 21 are continuously provided at a connection point P1, and the inner edge of the overhanging seal portion 27 is provided. 27A and the inner edge 21BA of the second portion 21B of the first bottom seal portion 21 are connected at a connection point P2. Further, the outer edge 27B of the overhanging seal portion 27 and the outer edge 21AB of the first portion 21A of the first bottom seal portion 21 are continuously provided at a connection point P3, and the outer edge 27B of the overhang seal portion 27 and the first bottom seal are connected. The outer edge 21BB of the second portion 21B of the portion 21 is continuously provided at a connection point P4.

  The width W6 (see FIG. 6) of the overhang seal portion 27 is preferably, for example, not less than 1 mm and not more than 5 mm. When the width W6 is 1 mm or more, there is no possibility that the contents leak from the overhanging seal portion 27 during transportation or the like, and when the width W6 is 2 mm or less, steam is easily released by heating in a microwave oven. The lower limit of the width W6 is more preferably 2 mm or more, and the upper limit is preferably 3 mm or less.

  The lower end 27BA of the outer edge 27B of the overhanging seal portion 27 relative to the distance D1 between the lower end 14A1 of the inner edge 14A of the first side seal portion 14 and the lower end 15A1 of the inner edge 15A of the second side seal portion 15 (with the connecting point P3 It is preferable that the ratio (L2 / D1) of the length L2 (see FIG. 6) of the virtual line IL1 connecting the continuous points P4) is 0.06 or more. When L2 / D1 is 0.06 or more, when the pouch 10 containing the contents is heated in a microwave oven with the back surface 12 of the pouch 10 facing down, the overhanging seal portion 27 is peeled off. The formed steam port is closed by the packaging material 40 constituting the front surface 11 and the packaging material 40 constituting the first portion 13A of the bottom surface 13 existing in the first unsealed portion 22 and the second unsealed portion 28. Can be suppressed. The lower limit of L2 / D1 is more preferably 0.07 or more and 0.08 or more (the larger the numerical value, the better), and the upper limit is 0 from the viewpoint of obtaining good drop impact resistance described later. .3 or less.

  The length L2 (see FIG. 6) of the virtual line IL1 is preferably 8 mm or more. If the length L2 is 8 mm or more, it is possible to further prevent the steam port from being blocked. The lower limit of the length L2 is more preferably 10 mm or more, and the upper limit is preferably 28 mm or less from the viewpoint of obtaining good drop impact resistance described later.

  The ratio (H2 / D3) of the height H2 (see FIG. 6) of the overhang seal portion 27 to the distance D3 (see FIG. 4) from the fold line 13C in the second direction DR2 to the lower end 27AA of the inner edge 27A of the overhang seal portion 27. Is preferably 0.18 or more. If H2 / D3 is 0.18 or more, the tip of the overhang seal portion 27 approaches the center of the pouch 10, and when the pressure in the pouch 10 increases with heating by the microwave oven, the overhang seal The stress is easily concentrated on the portion 27, and the overhanging seal portion 27 is easily peeled off. The “height of the overhanging seal portion” in this specification means a length from the lower end of the overhanging seal portion to the position of the overhanging seal portion closest to the accommodation space in the second direction.

  It is preferable that the height H2 of the overhanging seal portion 27 be 30 mm or less. If the height H2 is 30 mm or less, better drop impact resistance can be obtained. The lower limit of the height H2 is more preferably 5 mm or more, and the upper limit is preferably 20 mm or less, from the viewpoint of ease of vapor release.

  The height H2 of the overhanging seal portion 27 (see FIG. 6) with respect to the length L3 (see FIG. 6) of an imaginary line IL2 connecting the lower ends 27AA of the inner edge 27A of the overhanging seal portion 27 (the connection point P1 and the connection point P2). ) (H2 / L3) may be 1 or less, and preferably 0.45 or less. Self-supporting pouches may fall from the display shelf, so self-supporting pouches have a drop impact resistance so that the contents do not leak even if the pouch falls off the display shelf and receives an impact. Required. The drop impact resistance also depends on the distance between the inner edges of the overhanging seal portion, but tends to deteriorate when the height of the overhanging seal portion is high. In the present embodiment, when H2 / L3 is 0.45 or less, good drop impact resistance can be obtained. The lower limit of H2 / L3 is more preferably 0.4 or more, and the upper limit is preferably 0.4 or more, from the viewpoint of degassing.

  It is preferable that the length L3 of the virtual line IL2 is 10 mm or more. If the length L3 is 10 mm or more, steam can be stably discharged. The lower limit of the length L3 is more preferably 12 mm or more, and the upper limit is preferably 30 mm or less from the viewpoint of obtaining good drop impact resistance.

  The ratio (L3 / W7) of the length L3 of the imaginary line IL2 to the width W7 of the pouch 10 (see FIG. 4) is preferably 0.05 or more and 0.3 or less. When L3 / W7 is 0.05 or more, steam easily escapes, and when L3 / W7 is 0.3 or less, the contents easily leak when steam escapes. The lower limit of L3 / W7 is more preferably 0.1 or more, and the upper limit is preferably 0.25 or less.

  The inner edge 27A of the overhanging seal portion 27 shown in FIG. 5 has a first inner edge 27A1 located closest to the storage space 10A and a second inner edge 27A2 which is provided at both ends of the first inner edge 27A1 and is inclined downward. And In the overhang 24 shown in FIG. 5, the first inner edge 27A1 is curved in a convex shape toward the accommodation space 10A, and the second inner edge 27A2 is straight. By bending the first inner edge 27A1 in a convex shape toward the accommodation space 10A, the steam can be more easily released, and the steam can be stably discharged.

  As shown in FIG. 6, the outer edge 27B of the overhanging seal portion 27 is also connected to both ends of the first outer edge 27B1 located closest to the accommodation space 10A and both ends of the first outer edge 27B1, and the second edge is inclined downward. Outer edge 27B2. The other end of the second inner edge 27A2 on the first portion 21A side is connected to the inner edge 26A of the extending portion 26 of the first portion 21A, and the other end of the second outer edge 27B2 on the first portion 21A side is the first end. It is connected to the outer edge 26C of the extending portion 26 of the portion 21A. The other end of the second inner edge 27A2 on the second portion 21B side is connected to the inner edge 26B of the extending portion 26 of the second portion 21B, and the other end of the second outer edge 27B2 on the second portion 21B side is The second portion 21B is provided continuously with the outer edge 26D of the extending portion 26.

(Second unsealed part)
The second unsealed portion 28 is located on the outer edge 27 </ b> B side of the overhanging seal portion 27 and communicates with the first unsealed portion 22. By providing the second unsealed portion 28, when the overhanging seal portion 27 peels off due to heating by the microwave oven, the vapor in the storage space 10A reaches the second unsealed portion 28, and the first unsealed portion 22 is removed. The steam can be vented through.

  The ratio (S2 / S1) of the area S2 of the second unsealed portion 28 (the area of the region surrounded by the two-dot chain line and the outer edge 27B of the overhanging seal portion 27 shown in FIG. 6) to the area S1 of the entire overhang portion 24. Is 0.2 or more. If S2 / S1 is 0.2 or more, the overhanging seal portion 27 can be easily peeled off by heating with a microwave oven. The lower limit of S2 / S1 is preferably 0.3 or more, and the upper limit is preferably 0.8 or less.

It is preferable that the area S2 of the second unsealed portion 28 is not less than 10 mm ^{2 and not} more than 600 mm ² . If the area S2 is 10 mm ² or more, when the increased pressure within the pouch 10 with the microwave heating, stress is easily concentrated in the projecting seal portion 27, also if the 600 mm ² or less, the vapor Is more easily removed.

  The height H3 of the second unsealed portion 28 may be 2.0 mm or more. It is preferable that the lower limit of the height H3 of the second unsealed portion 28 is not less than 3.0 mm. If the height H3 is equal to or greater than 3.0 mm, the overhanging seal portion 27 approaches the center of the pouch 10, and when the pressure inside the pouch 10 increases due to heating by the microwave oven, the overhanging seal portion 27 is increased. Stress is more likely to concentrate on The “height of the second unsealed portion” in this specification refers to the position of the second unsealed portion closest to the storage space in the second direction from a virtual boundary line between the first unsealed portion and the second unsealed portion. It means the length to the position.

  As shown in FIG. 7, the pouch 10 is composed of a packaging material 40 having at least a base material layer 41 and a sealant layer 42 in this order. The sealant layer 42 is a layer that forms the innermost surface of the pouch 10. The packaging material 40 may further include, in addition to the base material layer 41 and the sealant layer 42, a functional layer or a bonding layer that exhibits a desired function. Specifically, the packaging material 40 shown in FIG. 6 may include a base layer 41, a functional layer 43, a bonding layer 44, and a sealant layer 42 in this order from the outside. A bonding layer may be provided between the base layer 41 and the functional layer 43.

<Base layer>
Since the pouch 10 is heated in a microwave oven, the base layer 41 is preferably made of a material having heat resistance. As the base material layer 41, for example, a stretched polyester film such as a stretched polyethylene terephthalate film, a stretched polyamide film such as a stretched silica stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, or a polypropylene / ethylene-vinyl alcohol copolymer. A co-stretched film or a composite film in which two or more of these films are laminated can be used.

  The base layer 41 is preferably subjected to a biaxial stretching process. Thereby, molecules constituting the base layer 41 are arranged in the stretching direction by the stretching process, and the base layer 41 exhibits excellent dimensional stability.

  The thickness of the base layer 41 can be, for example, not less than 10 μm and not more than 30 μm. If the thickness of the base layer 41 is 10 μm or more, the heat resistance required for the pouch 10 can be satisfied, and if it is 30 μm or less, the product cost can be reduced. The thickness of the base material layer 41 shall be determined as an arithmetic average of the measured thicknesses by randomly measuring the thickness of ten places from a cross-sectional photograph of the base material layer taken using an optical microscope. In the pouch 10, the base material layer 41 is disposed so as to be the outermost.

<Sealant layer>
The sealant layer 42 is provided in order to seal the accommodation space of the pouch 10 by superposing two packaging materials 40 on each other and thermally fusing the front surface and the back surface. For this reason, in the pouch 10, the sealant layer 42 is arranged so as to be closest to the housing space 10A.

  As the sealant layer 42, a heat-resistant film made of a polyolefin-based resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-propylene block copolymer, and an easy peel film can be used. The sealant layer 42 may have a single-layer structure or a multilayer structure. Since the pouch 10 is heated in a microwave oven, the sealant layer 42 is preferably a low-density polyethylene layer (LDPE layer) mainly including low-density polyethylene (LDPE).

  The thickness of the sealant layer 42 is preferably 20 μm or more and 80 μm or less. When the thickness of the sealant layer 42 is 20 μm or more, the pouch 10 has excellent drop impact resistance against a drop that may occur in the course of distribution, and when the thickness is 80 μm or less, it is excellent in handleability such as easy filling of contents. The thickness of the sealant layer 42 can be measured by the same method as the thickness of the base material layer 41.

<Functional layer>
The functional layer 43 is provided between the base material layer 41 and the sealant layer 42, but may be provided outside the base material layer 41. Examples of the functional layer 43 include a printing layer, a gas barrier layer having a gas barrier property such as water vapor or the like, and a light shielding layer. As the gas barrier layer, a deposition layer of an inorganic oxide such as silicon oxide is provided.

  The printing layer is a layer containing a coloring material and a binder resin. By forming the printing layer, a pattern can be formed on the pouch 10. “Picture” in this specification is not particularly limited, and includes, for example, figures, characters, patterns, patterns, symbols, patterns, marks, and the like widely.

  The printing layer may contain other optional additives. Examples of additives include a lubricant, an antiblocking agent, a filler, a curing agent, a pigment dispersant, an antifoaming agent, a leveling agent, a wax, a silane coupling agent, a preservative, an antioxidant, an ultraviolet absorber, and rust prevention. Agents, plasticizers, flame retardants, color developers and the like. These additives are used particularly for the purpose of improving printing adequacy, printing effects, and the like, and the type and amount of the additives can be appropriately selected depending on the printing method, the printing substrate, and the printing conditions. The printing layer can be formed on the base material layer 41 by a printing method such as gravure printing.

(Color material)
The coloring material is not particularly limited, and a known pigment or dye can be used, and is appropriately selected according to a desired color.

(Binder resin)
As the binder resin, for example, linseed oil, cutting oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin modified resin, shellac, alkyd resin, phenolic resin, maleic acid resin, natural resin, hydrocarbon resin, Polyvinyl chloride resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, (meth) acrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin, melamine resin, aminoalkyd Examples include a base resin, nitrocellulose, ethylcellulose, chlorinated rubber, cyclized rubber, a polymer of a (meth) acrylate compound, or a mixture thereof.

<Joining layer>
As the bonding layer 44, 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, Ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, amino resin adhesives, epoxy adhesives, polyurethane adhesives, and the like can be used. The polyurethane adhesive is a cured product of a polyol compound and an isocyanate compound.

<< Other shapes of overhang part >>
Although the overhang 24 shown in FIG. 1 has a substantially triangular shape, the overhang 24 may have a shape as shown in FIGS. 8 (A) and 8 (B). The overhang 24 shown in FIGS. 8A and 8B is the same as the overhang 24 shown in FIGS. 5 and 6 except for the following description (for example, dimensions and ratios). It is.

  In the inner edge 27A of the overhanging seal portion 27 shown in FIG. 8A, a flat first inner edge 27A1 located closest to the storage space 10A and both ends of the first inner edge 27A1 are provided continuously and directed downward. The second inner edge 27A2 includes a slanted second inner edge 27A2 and a linear third inner edge 27A3 connected to the second inner edge 27A2 and extending in the second direction DR2. In addition, the outer edge 27B of the overhanging seal portion 27 shown in FIG. 8A is connected to both ends of the flat first outer edge 27B1 located closest to the accommodation space 10A and both ends of the first outer edge 27B1, and , And a third linear outer edge 27B3 connected to the second outer edge 27B2 and extending in the second direction DR2. The other end of the third inner edge 27A3 on the first portion 21A side is connected to the inner edge 26A of the extending portion 26 of the first portion 21, and the other end of the third outer edge 27B3 on the first portion 21A side is the first portion. The extension portion 26 is connected to the outer edge 26C of the extension portion 26. The other end of the third inner edge 27A3 on the second portion 21B side is connected to the inner edge 26B of the extending portion 26 of the second portion 21B, and the other end of the third outer edge 27B3 on the second portion 21B side is connected to the other end. , And is connected to the outer edge 26D of the extending portion 26 of the second portion 21B.

  At the inner edge 27A of the overhanging seal portion 27 shown in FIG. 8B, a first inner edge 27A1 which is located closest to the accommodation space 10A and is curved in a convex shape toward the accommodation space 10A, and both ends of the first inner edge 27A1 And a second inner edge 27A2 inclined downward and a straight third inner edge 27A3 connected to the second inner edge 27A2 and extending in the second direction DR2. In addition, the outer edge 27B of the overhanging seal portion 27 shown in FIG. 7 (B) is the first outer edge 27B1 that is positioned closest to the storage space 10A and is curved in a convex shape toward the storage space 10A, and the first outer edge 27B1. , And a second outer edge 27B2 inclined downward. The other end of the third inner edge 27A3 on the first portion 21 side is connected to the inner edge 26A of the extending portion 26 of the first portion 21, and the other end of the second outer edge 27B2 on the first portion 21 side is It is connected to the outer edge 26 </ b> C of the extending part 26 of the one part 21. The other end of the third inner edge 27A3 on the second portion 21B side is connected to the inner edge 26B of the extending portion 26 of the second portion 21B, and the other end of the second outer edge 27B2 on the second portion 21B side is connected to the other end. , And is connected to the outer edge 26D of the extending portion 26 of the second portion 21B.

<< Pouch manufacturing method >>
Such a pouch 10 can be manufactured as follows. First, three packaging materials 40 to be the front surface 11, the back surface 12, and the bottom surface 13 are prepared. The packaging material to be the bottom surface 13 is folded in two so that the base material layer 41 is on the inside, and is punched in a circular shape in the folded state to form a through hole.

  Then, the folded packaging material 40 serving as the bottom surface 13 is disposed at a predetermined position between the packaging material 40 serving as the front surface 11 and the packaging material 40 serving as the back surface 12, and the first side seal portion 14 is provided. Then, the second side seal portion 15, the first bottom seal portion 21, the second bottom seal portion 31, and the area to be the overhanging seal portion 27 (excluding the upper seal portion) are heat-sealed and joined. In addition, in the through-hole part, since the packaging material 40 which becomes the folded bottom surface 13 does not exist, the packaging material 40 which becomes the front surface 11 and the packaging material 40 which becomes the back surface 12 are directly heat-sealed, A third bottom seal 17 is formed.

  Then, the pouch 10 can be obtained by cutting the heat-sealed area according to the shape of the pouch 10. When accommodating the contents in the pouch 10, the contents are filled from the opening existing in the upper part, and the upper seal part is formed by heat sealing the upper part of the front surface 11 and the upper part of the rear surface 12, Seal the pouch 10.

  According to the present embodiment, the first fold 20 and the second fold 30 are joined by the third bottom seal 17, so that they can be self-standing as shown in FIG. Thereby, the pouch 10 can be sold or displayed in a state of being independent. The pouch 10 shown in FIG. 9 has an upper seal portion 18 formed by joining the front surface 11 and the rear surface 12 at the upper portion, and accommodates contents (not shown). Have been. The upper seal portion 18 is formed from the first side seal portion 14 to the second side seal portion 15 along the first direction DR1.

  According to the present embodiment, since the first fold portion 20 is provided with the overhanging seal portion 27, as shown in FIG. 10, in a state where the back surface 12 of the pouch 10 is set to the lower side in the microwave oven, The pouch 10 containing the contents can be heated. Thus, the height of the inside of the microwave oven is less restricted. Therefore, the capacity of the pouch 10 can be increased. In this case, since the pouch 10 shown in FIG. 9 is used as the pouch, the upper seal portion 18 is formed and the contents are accommodated.

  When the pouch containing the contents is heated in a microwave oven with the back of the pouch facing down, the storage space is expanded by the heated steam. Then, when the pressure in the pouch reaches a predetermined pressure, the overhanging seal portion is peeled from the distal end side. When the peeling of the overhanging seal portion progresses to the second unsealed portion, the overhanging seal portion is opened to form a steam port. Thereby, the accommodation space is connected to the outside, and the steam escapes to the outside through the steam port. Here, when the pouch is heated, an internal pressure is applied concentrically from the center of the pouch, but when the inner edge of the bottom seal portion is in an arc shape, the inner edge of the bottom seal portion is at the center O of the pouch (FIG. 11A )), Pressure is easily applied to the bottom seal portion. For this reason, at the time of heating in a microwave oven, peeling of the overhanging seal portion does not progress, and it may be difficult to release steam. In particular, when the folding is deep, peeling of the overhanging seal portion does not proceed during heating in a microwave oven, and it is difficult to release steam. On the other hand, according to the present embodiment, since the bottom seal portion 21 is provided with the extension portion 26 having the inner edge 26A extending along the first direction DR1, pressure is concentrated on the overhang seal portion 27. As described above, the inner edge 26A of the extending portion 26A is located away from the center O (see FIG. 4). As a result, pressure is easily applied to the overhanging seal portion 27 in a concentrated manner, so that peeling of the overhanging seal portion 27 proceeds during heating in a microwave oven, and vapor can be easily removed. Further, even in the case where the folding is deep such that the ratio (D1 / H1) of the distance D1 from the folding line 13C to the height H1 of the pouch 10 to the inner edge 26A of the extending portion 26 is 0.70 or more, the microwave oven is also used. At the time of heating, the peeling of the overhanging seal portion 27 progresses, and the steam can be easily released.

  Even in the state where the steam port is formed, the packaging material forming the front surface and the packaging material forming the back surface sandwiching the second unsealed portion and the first unsealed portion are bent in the same direction, and The mouth may be obstructed. On the other hand, according to the present embodiment, the ratio (S2 / S1) of the area S2 of the second unsealed portion 28 to the area S1 of the entire projecting portion 24 is 0.2 or more, and the first side portion. An imaginary line connecting the lower ends 27BA of the outer edges 27B of the overhanging seal portion 27 in the first direction DR1 with respect to the distance D1 between the lower end 14A1 of the inner edge 14A of the seal portion 14 and the lower end 15A of the inner edge 15A of the second side seal portion 15. Since the ratio (L2 / D1) of the length L2 of IL1 is 0.06 or more, the width of the formed steam port is widened. Thereby, since the steam port can be suppressed from being blocked by the two packaging materials 40, steam can be more easily released.

  EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. 11A is a front view of the pouch according to Comparative Example 1, and FIG. 11B is an enlarged view of the vicinity of the overhang of the pouch shown in FIG. 11A.

<Examples 1 to 3>
In Examples 1 to 3, the dimensions of the projecting portion and the extending portion of the pouch were respectively changed to produce the standing type pouch shown in FIG. Specifically, first, a packaging material to be the front surface, the back surface, and the bottom surface was prepared. The packaging material was obtained by laminating a base layer made of a biaxially stretched polyethylene terephthalate film, a bonding layer made of a polyurethane adhesive, and a sealant layer made of an unstretched polyethylene film in this order. In the packaging material serving as the bottom surface, the first and second portions are formed by folding the sealant layer in such a manner that the sealant layer is on the outside, and the cutting is performed in a folded state. When a pouch was later formed, a portion near the lower end of both lateral edges of the bottom face was punched out into a circular shape having a diameter of 10 mm to form a through hole.

  Then, the folded bottom packaging material is arranged at a predetermined position between the packaging material serving as the front surface and the packaging material serving as the back surface, and the first side sealing portion and the second side sealing portion are arranged. The first and second bottom seal portions, the region to be the overhang seal portion (excluding the upper seal portion) were heat-sealed and joined. In the through-hole portion, there is no packaging material serving as a folded bottom surface, so that the packaging material serving as the front surface and the packaging material serving as the back surface are directly heat-sealed, and the third bottom seal portion is formed. Been formed.

Then, a plurality of pouches having the same structure as the pouch shown in FIG. 1 were produced by cutting the heat-sealed region according to the shape of each pouch. In the pouch according to Example 1, the width W1 was 7.00 mm, the width W2 and the width W were 35.00 mm, the width W4 was 6.00 mm, the width W5 was 10.51 mm, and the width W6 was 2.50 mm. The width W7 is 130.00 mm, the distance D1 is 116.0 mm, the distances D2 and D3 are 29.0 mm, the length L1 is 21.7 mm, the length L2 is 10.51 mm, and the length L3 is 16.5 mm. H1 was 180.0 mm, height H2 was 6.0 mm, height H3 was 3.0 mm, area S1 was 49.5 mm ² , and area S2 was 15.77 mm ² . The dimensions of the pouch according to the second embodiment are as follows: width W5 is 10.00 mm, length L1 is 22.3 mm, length L2 is 10.00 mm, length L3 is 15.6 mm, height H2 is 7.54 mm, Example 1 was the same as Example 1 except that the height H3 was 4.0 mm, the area S1 was 58.81 mm ² , and the area S2 was 20.0 mm ² . The dimensions of the pouch according to the third embodiment are as follows: width W5 is 15.33 mm, length L1 is 16.71 mm, length L2 is 15.33 mm, length L3 is 21.3 mm, height H2 is 8.0 mm, Example 1 was the same as Example 1 except that the height H3 was 5.0 mm, the area S1 was 85.2 mm ² , and the area S2 was 38.33 mm ² . The dimensions of each part of the pouch according to Examples 1 to 3 were as shown in FIGS.

  The pouch is filled by filling 100 g of water as a content from the upper opening formed between the front surface and the back surface of each of the prepared pouches, and heat sealing the upper portion of the front surface and the upper portion of the back surface. Sealed. In this way, pouches according to Examples 1 to 3 were produced. Note that the pouches according to Examples 1 to 3 were self-supporting when water was contained.

<Comparative Example 1>
As shown in FIG. 11A, the inner edge of the bottom seal portion of the pouch according to Comparative Example 1 was formed in an arc shape, and the same material as the pouch according to Examples 1 to 3 was used. The pouches according to Nos. 1 to 3 were manufactured by the same manufacturing method. In the pouch according to Comparative Example 1, the width W8 of the thinnest portion of the first bottom seal portion and the second bottom seal portion is 9 mm, the width W5 is 10.0 mm, the distance D3 is 26.0 mm, and the length. L1 is 0 mm, length L2 is 6.0 mm, length L3 is 10.0 mm, height H2 is 4.0 mm, height H3 is 1.5 mm, area S1 is 19.5 mm ² , and area S2 is 4.5 mm. Except that it was ² , it was the same as Example 1. Note that the pouch according to Comparative Example 1 was also self-supporting when water was contained.

<Evaluation of steam loss>
Each of the pouches according to Examples 1 to 3 and Comparative Example 1 was placed in a microwave oven having a height of 150 mm (model number “RE-S5C-W”, manufactured by SHARP Co., Ltd.) with the back surface facing down. And heated at 600 W for 1 minute. In addition, each new pouch was placed in the same microwave oven with the back side down, and heated at 600 W for 2 minutes. Then, it was evaluated whether or not steam was automatically released from the overhang portion in the heated pouch. The evaluation criteria were as follows.
：: Steam was normally released from the overhang.
X: Steam did not escape from the overhang portion or did not escape much.

<Evaluation of drop impact resistance>
When each pouch according to Examples 1 to 3 and Comparative Example 1 is gripped such that the bottom surface is on the floor side and the pouch is dropped on the floor from a position of 100 cm in height, does water leak from the pouch after falling? It was evaluated whether or not. The evaluation criteria were as follows.
：: Water did not leak from the pouch.
Δ: Water was slightly leaked from the pouch, but at a level having no practical problem.
×: Water leaked from the pouch unacceptably.

The evaluation results are shown in Table 1 below.

  Hereinafter, the results will be described. As shown in Table 1, in the pouch according to Comparative Example 1, steam was not released by heating for 1 minute. This is considered to be because the inner edge of the bottom seal portion was formed in an arc shape, so that little pressure was applied to the overhanging seal portion, and no steam port was formed. In addition, the vapor did not escape much by heating for 2 minutes. This is because the ratio (S2 / S1) of the area S2 of the second unsealed portion to the area S1 of the entire overhanging portion was 0.2 or more, but the ratio (L2 / D1) of the length L2 to the distance D1 was increased. , Less than 0.06, the overhanging seal portion was peeled off during heating, and a steam port was formed. However, the packaging forming the front surface of the first unsealed portion and the second unsealed portion. It is considered that the steam port was closed because the material and the packaging material constituting the back surface were bent in the same direction.

  On the other hand, in the pouches according to the first to third embodiments, the first portion and the second portion of the bottom seal portion each have the extending portion having the inner edge extending along the first direction, so that the pouch has one minute. Even with heating, steam escaped normally. In the pouches according to Examples 1 to 3, the ratio (S2 / S1) of the area S2 of the second unsealed portion to the area S1 of the overhanging portion is 0.2 or more, and the length with respect to the distance D1. Since the ratio of L2 (L2 / D1) was 0.06 or more, the steam port was not blocked even after the steam port was formed.

Reference Signs List 10 pouch 10A accommodation space 11 front surface 12 back surface 13 bottom surface 13A first portion 13B second portion 13C folding line 14 first side sealing portion 15 second side sealing portion 17 Third bottom seal part 20 First fold part 21 First bottom seal part 21A First part 21B Second part 22 First unsealed part 22A Outer edge 24 Projecting part 25 Slope 26 Existing portions 26A, 26B ... inner edge 27 ... overhanging seal portion 27A ... inner edge 27AA ... lower end 27A1 ... first inner edge 27A2 ... second inner edge 27B ... outer edge 27BB ... lower end 28 ... second unsealed portion 30 ... second fold portion 31 ... Second bottom sealing part 40: packaging material 41: base material layer 42: sealant layer

Claims (7)

It is composed of a packaging material having at least a base material layer and a sealant layer, and has a front surface, a back surface facing the front surface, and a folding line located between the front surface and the back surface. A pouch having a bottom surface having a first portion and a second portion connected through a hole, and a housing space,
A pair of sides,
A first side sealing portion formed on one of the side portions;
A second side seal formed on the other side,
A first fold portion formed by joining the first portion of the front surface and the bottom surface and located below the first side seal portion;
A second fold formed by joining the back surface and the second portion of the bottom surface and located below the second side seal portion;
The first fold has a first bottom seal and a first unseal,
The second fold has a second bottom seal,
A third bottom seal portion formed by joining the sealant layer on the front surface and the sealant layer on the back surface at a side portion of the first fold portion and a side portion of the second fold portion; ,
The first bottom seal portion is divided into a first portion and a second portion via the first unsealed portion;
The first portion and the second portion of the first bottom seal portion are respectively inclined portions inclined downward from the side portions to a central portion of the pouch, and are located on the central portion side of the inclined portion. And an extending portion having an inner edge extending along a first direction orthogonal to a side edge of the pouch,
The second bottom seal portion includes an inclined portion inclined downward from the side portion of the pouch toward the central portion,
The first fold portion further includes an overhanging portion that extends from the first portion and the second portion of the first bottom seal portion toward the housing space,
An overhanging portion connected to the extending portion of the first portion of the first bottom seal portion and the extending portion of the second portion of the first bottom seal portion; A second unsealed portion communicating with the first unsealed portion on an outer edge side of the overhanging seal portion;
When the overhanging seal portion is peeled off, the steam is released from between the front surface and the first portion of the bottom surface,
A pouch wherein the second fold is not provided with a steam vent mechanism.   The pouch according to claim 1, wherein a ratio of a distance from the fold line to the inner edge of the extending portion to a height of the pouch is 0.70 or more.   The pouch according to claim 1 or 2, wherein a ratio of a length of the extending portion to a distance from the fold line to the inner edge of the extending portion is 0.30 or more.   The inner edge of the overhanging seal portion includes a first inner edge located closest to the storage space side, and second inner edges connected to both ends of the first inner edge, and the second inner edge faces downward. The pouch according to any one of claims 1 to 3, wherein the pouch is inclined.   The first unsealed portion is formed between the packaging material forming the front surface and the packaging material forming the first portion of the bottom surface, and an outer edge of the first unsealed portion and the first unsealed portion are formed. The pouch according to any one of claims 1 to 4, wherein the outer edge of the one bottom seal portion is located on the same straight line or the same curve.   An opening start means formed on at least one of the first side seal portion and the second side seal portion and provided at a position lower than a half height of the pouch. Item 6. The pouch according to any one of Items 1 to 5. Contents are stored in the storage space of the pouch,
In the upper part of the pouch, further comprising an upper seal portion formed by joining the front surface and the back surface,
The method according to claim 1, wherein the upper seal portion extends from the first side seal portion to the second side seal portion along the first direction. Pouch.

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