Standing pouch

Abstract

To provide a standing pouch that can achieve a narrower width while maintaining the content volume, thereby reducing the risk of tipping over. [Solution] The standing pouch comprises a first sheet and a second sheet, a bottom sheet adhered to the first sheet and the second sheet respectively, and a steam venting mechanism for releasing steam from the internal space. The steam venting mechanism is provided in either the first side seal or the second side seal. The width of the standing pouch is 110 mm or more and less than 140 mm. The height of the standing pouch is 150 mm or more and 180 mm or less. When 180 ml of water is contained in the internal space as the contents, and the bottom sheet is released and the standing pouch is standing upright on a horizontal surface, the horizontal force applied to the steam venting mechanism that causes the standing pouch to tip over is 0.40 N or more.

Description

[Technical Field]

[0001] This invention relates to a standing pouch. [Background technology]

[0002] Conventionally, pouches filled with cooked or semi-cooked liquids, viscous substances, solids, and other contents have been used. For example, Patent Document 1 below discloses a microwave pouch equipped with a steam venting mechanism and having a bottom gusset. This microwave pouch has a surface film, a back film, and a bottom film located between the surface film and the back film, and an opening means is provided below the steam venting mechanism. During heating of the microwave pouch in a microwave oven, the steam generated inside the pouch is discharged to the outside through the steam venting mechanism. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-127257 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In recent years, standing pouches that can be heated in a microwave oven while remaining upright have become popular. However, during microwave heating, the contents may shift, and steam may be generated, potentially causing the standing pouch to tip over. To prevent such tipping, standing pouches tend to be made wider. Widening the standing pouch also allows for increasing its depth. In fact, the width of currently available microwave-safe standing pouches is typically 140mm or more. Furthermore, to prevent tipping during storage and to ensure sufficient contents, the height of currently available microwave-safe standing pouches is typically around 150mm to 180mm.

[0005] However, the increased width of standing pouches means they occupy a larger area on display shelves. Therefore, the retail industry is requesting that standing pouches be made narrower while maintaining the same content volume. Simply narrowing the standing pouches to meet this demand would increase the risk of them tipping over, not only during heating but also during display.

[0006] Therefore, one aspect of the present invention is to provide a standing pouch that can be narrowed while maintaining the content volume and that can reduce the risk of tipping over. [Means for solving the problem]

[0007] The standing pouch relating to one aspect of this disclosure is as follows: [1] The first sheet and the second sheet are erected upright against each other, A bottom sheet is bonded to the first sheet and the second sheet, and is folded in a V-shape when viewed from the side, A steam venting mechanism for discharging steam from the internal space defined by the first sheet, the second sheet, and the bottom sheet, A standing pouch equipped with, In a front view, a first side seal is provided on the left edge of the first sheet and the second sheet, and a second side seal is provided on the right edge of the first sheet and the second sheet. The steaming mechanism is provided in either the first side seal or the second side seal. The width of the aforementioned standing pouch is 110 mm or more and less than 140 mm. The height of the aforementioned standing pouch is 150 mm or more and 180 mm or less. When 180 ml of water is contained in the internal space, and the bottom sheet is released and the standing pouch is erected on a horizontal surface, the horizontal force applied to the steam venting mechanism that causes the standing pouch to tip over is 0.40 N or more. Standing pouch. [2] The standing pouch according to [1], wherein the horizontal force is 0.48 N or more. [3] A standing pouch according to [1] or [2], wherein 180 ml of water is contained in the internal space as the contents, and when the folding of the bottom sheet is released and the standing pouch is erected on a horizontal surface, the angle between the horizontal surface and the bottom of the standing pouch when the standing pouch falls over is 30° or more and 45° or less. [4] The standing pouch as described in [3], wherein the angle is 35° or more and 45° or less. [5] The maximum depth at the bottom of the aforementioned standing pouch is 55 mm or more. The standing pouch according to any one of [1] to [4], wherein the ratio of the height of the steaming mechanism to the height of the standing pouch is 60% or more and 78% or less. [6] The folding depth of the bottom sheet is 35 mm or more, as described in [5], for the standing pouch. [7] A bottom seal is provided by a part of the first sheet and a part of the bottom sheet, and a part of the second sheet and another part of the bottom sheet. In a front view, the radius of curvature of the upper edge curve portion of the bottom seal is greater than 45 mm, and the standing pouch according to any one of [1] to [6]. [8] In a front view, the minimum width at the center of the bottom seal is greater than 7 mm and 10 mm or less, and the standing pouch according to [7]. [9] In at least one of the first side seal and the second side seal, the portion located below the steam passage mechanism becomes narrower as it approaches the bottom seal, and the standing pouch according to [7] or [8].

Advantages of the Invention

[0008] According to one aspect of the present invention, a standing pouch is provided that can achieve narrowing while maintaining the content volume and can reduce the risk of tipping over.

Brief Description of the Drawings

[0009] [Figure 1] FIG. 1(a) is a front view showing an example of a standing pouch according to an embodiment. FIG. 1(b) is a front view showing another example of a standing pouch according to an embodiment. [Figure 2] FIG. 2(a) is a schematic front view showing the self-standing state of the standing pouch shown in FIG. 1(a). FIG. 2(b) is a schematic side view of the standing pouch shown in FIG. 2(a). [Figure 3] FIG. 3 is a front view showing a two-dimensional model of the standing pouch in Reference Example 1. [Figure 4] FIG. 4(a) is a front view showing a three-dimensional model of the standing pouch in Reference Example 1, FIG. 4(b) is a bottom view of the standing pouch shown in FIG. 4(a), and FIG. 4(c) is a side view of the standing pouch shown in FIG. 4(a). [Figure 5]FIG. 5(a) is a front view showing a three-dimensional model of the standing pouch in Example 1, FIG. 5(b) is a bottom view of the standing pouch shown in FIG. 5(a), and FIG. 5(c) is a side view of the standing pouch shown in FIG. 5(a). [Figure 6] Each of FIGS. 6(a) and (b) is a diagram for explaining the allowable angle of the standing pouch. [Figure 7] Each of FIGS. 7(a) and (b) is a diagram for explaining the allowable horizontal force of the standing pouch.

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments according to one aspect of the present invention will be described with reference to the drawings as appropriate. However, the following embodiments are examples for explaining one aspect of the present invention, and are not intended to limit the present invention to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant descriptions are omitted as appropriate. Also, the dimensional ratios in the drawings are not limited to the ratios shown.

[0011] <Standing Pouch> A standing pouch according to one aspect of this embodiment comprises a first sheet and a second sheet that stand upright relative to each other, a bottom sheet that is bonded to the first sheet and the second sheet and folded in a V-shape when viewed from the side, and a steam venting mechanism for discharging steam from the internal space defined by the first sheet, the second sheet and the bottom sheet. In this standing pouch, when viewed from the front, a first side seal is provided on the left edge of the first sheet and the second sheet, and a second side seal is provided on the right edge of the first sheet and the second sheet. The steam venting mechanism is provided on either the first side seal or the second side seal. The width of the standing pouch is 110 mm or more and less than 140 mm, and the height of the standing pouch is 150 mm or more and 180 mm or less. Furthermore, when 180 ml of water is contained within the internal space of the standing pouch, and the bottom sheet is released and the standing pouch is erected on a horizontal surface, the horizontal force (allowable horizontal force) applied to the vaporization mechanism that causes the standing pouch to tip over is 0.40 N or more. This horizontal force may also be 0.48 N or more.

[0012] A standing pouch that satisfies the above-described configuration and parameters can reduce the risk of tipping over not only during standing but also during heating, while maintaining the content volume and achieving a narrower width (i.e., less than 140 mm in width). For example, when a standing pouch tips over due to the application of a horizontal force to the steam venting mechanism, the angle between the horizontal plane and the bottom of the standing pouch can be between 30° and 45°, or between 35° and 45°.

[0013] In the following, specific examples of the standing pouch according to this embodiment will be described in detail with reference to Figures 1(a), (b) and 2(a), (b). Figure 1(a) is a front view showing an example of the standing pouch according to the embodiment. Figure 1(b) is a front view showing another example of the standing pouch according to the embodiment. Figure 2(a) is a schematic front view showing the standing pouch shown in Figure 1(a) in a self-supporting state. Figure 2(b) is a schematic side view of the standing pouch shown in Figure 2(a).

[0014] The standing pouch 100 shown in Figures 1(a) and 2(a) and 2(b), and the standing pouch 100A shown in Figure 1(b), are self-standing packaging bags for sealing contents such as liquids, gels, powders, and solids. Both the standing pouch 100 and 100A are microwave-safe. Figures 1(a) and 1(b) show the standing pouch 100 and 100A before they are filled with contents. Figures 2(a) and 2(b) show the standing pouch 100 after it has been filled with contents I and is self-standing. The shape of the standing pouch 100A shown in Figure 1(b) is substantially similar to the shape of the standing pouch 100 shown in Figure 1(a), and is smaller than the standing pouch 100. Therefore, the standing pouches 100 and 100A have the same constituent elements. In the following, only the constituent elements of Standing Pouch 100 will be explained in detail, and the constituent elements of Standing Pouch 100A will be omitted.

[0015] In the following, the horizontal direction in Figures 1(a) and 1(b) (i.e., the horizontal direction in the front view of the standing pouches 100 and 100A) will be referred to as direction X (left-right direction), the vertical direction as direction Y (up-down direction), and the direction perpendicular to directions X and Y as direction Z (depth direction). Therefore, in the dimensions of the standing pouches 100 and 100A, the dimension along direction X will be referred to as width, the dimension along direction Y as height, and the dimension along direction Z as depth. In this embodiment, the contents of the standing pouch 100 shown in Figures 2(a) and 2(b) are 180 ml of water. Figure 2(b) shows the center of gravity G of the standing pouch 100.

[0016] In this embodiment, the width W1 of the standing pouch 100 along direction X and the width W2 of the standing pouch 100A along direction X are each 110 mm or more and less than 140 mm. In one example, the width W1 shown in Figure 1(a) is 120 mm, and the width W2 shown in Figure 1(b) is 110 mm. The height H1 of the standing pouch 100 along direction Y and the height H2 of the standing pouch 100A along direction Y are each 150 mm or more and 180 mm or less. In one example, the heights H1 and H2 shown in Figures 1(a) and (b) are each approximately 160 mm. When the width and height of the standing pouches 100 and 100A are within the above range, the center of gravity of the standing pouches 100 and 100A containing the contents tends not to become excessively high when they are standing upright. Therefore, the risk of the Standing Pouch 100 tipping over can be reduced, while also decreasing the area occupied by the Standing Pouch 100 and 100A on display shelves and other locations.

[0017] In this embodiment, widths W1 and W2, and heights H1 and H2 are defined as the width and height of the standing pouches 100 and 100A before they are filled with contents, respectively. Here, the width and height of the standing pouches when they are filled with contents and standing upright do not differ significantly from the width and height of the standing pouches 100 and 100A before they are filled with contents. For this reason, the width and height of the standing pouches when they are filled with contents and standing upright may be considered to be substantially the same as the width and height of the standing pouches 100 and 100A before they are filled with contents.

[0018] The standing pouch 100 comprises a pair of main sheets 1 and 2 (a first sheet and a second sheet) that stand upright relative to each other, a bottom sheet 3 that is adhered to each of the main sheets 1 and 2, and a steam venting mechanism 4 for discharging steam from the internal space S defined by the main sheets 1 and 2 and the bottom sheet 3. In this embodiment, the main sheets 1 and 2 are different sheets, but are not limited to this. For example, main sheet 1 may correspond to half of a sheet folded in half, and main sheet 2 may correspond to the other half of that sheet.

[0019] The bottom sheet 3 is a sheet that is folded in a V-shape when viewed from the side and is sandwiched between the main sheets 1 and 2. When the bottom sheet 3 is released, the bottom of the standing pouch 100 expands, allowing the standing pouch 100 to stand on its own. The folded portion 3a of the bottom sheet 3 is the folded tip that extends from the first side seal 10 to the second side seal 20, which will be described later, and extends along direction X. The greater the distance from the lower end 100a of the standing pouch 100 to the folded portion 3a in direction Y (the folding depth of the bottom sheet 3), the easier it is for the bottom of the standing pouch 100 to expand. In other words, the greater the folding depth of the bottom sheet 3, the less likely the self-supporting standing pouch 100 is to tip over. In this embodiment, the folding depth of the bottom sheet 3 is 35 mm or more. This improves the bottom opening ability of the standing pouch 100, and makes it easier for the maximum depth of the bottom of the standing pouch 100 to be 55 mm or more. The maximum depth d at the bottom of the standing pouch 100 shown in Figure 2(b) is, for example, 55 mm or more, 56 mm or more, 60 mm or more, 63 mm or more, or 65 mm or more. The maximum depth at the bottom of the standing pouch 100A is also 55 mm or more.

[0020] As shown in Figures 1(a) and 2(a), a first side seal 10 is provided on the left edge of the main sheets 1 and 2, and a second side seal 20 is provided on the right edge of the main sheets 1 and 2. The first side seal 10 and the second side seal 20 are formed, for example, by heat sealing the sealants contained in the main sheets 1 and 2. The widths of the first side seal 10 and the second side seal 20 are, for example, 5 to 10 mm, or 7 to 9 mm. A width of 5 mm or more for each side seal tends to achieve sufficient sealing strength, and a width of 10 mm or less for each side seal tends to make it easier to secure a sufficient volume of contents in the standing pouch 100. In addition, the steam venting mechanism 4 is provided in either the first side seal 10 or the second side seal 20. In this embodiment, the steam venting mechanism 4 is provided in the second side seal 20. Furthermore, a bottom seal 30 is provided by a part of the main sheet 1 and a part of the bottom sheet 3, as well as a part of the main sheet 2 and another part of the bottom sheet 3. The left and right directions of the main sheets 1 and 2 refer to the left and right sides of the main sheet 1 when the main sheet 1 is facing forward, as shown in Figures 1(a) and (b).

[0021] The first side seal 10 includes a first portion 11 that joins the main sheets 1 and 2, and a second portion 12 that joins the opposing surfaces of the folded bottom sheet 3. The first portion 11 has a strip shape that extends substantially linearly along direction Y from the upper end 100b of the standing pouch 100 to the folded portion 3a of the bottom sheet 3, for example, when viewed from the front. In this embodiment, the first portion 11 is provided with a notch 11a for opening the standing pouch 100, but is not limited to this. The width of the first portion 11 along direction X may be the same or different. For example, the width of the upper end portion of the first portion 11 may be greater than the width of the lower end portion of the first portion 11. The width of the first portion 11 may narrow as it approaches the second portion 12 along direction Y. In one example, in direction Y, the portion of the first portion 11 located below the steam passage mechanism 4 may narrow as it approaches the bottom seal 30. The second part 12 extends, for example, along the left edge of the folded bottom sheet 3 in a front view, and connects to the first part 11. The width of the second part 12 along direction X may be the same or different. For example, in direction Y, the width of the upper end of the second part 12 may be greater than the width of the lower end of the second part 12.

[0022] The second side seal 20 includes a first portion 21 that joins the main body sheets 1 and 2 and is located above the steam passage mechanism 4, a second portion 22 that joins the main body sheets 1 and 2 and is located below the steam passage mechanism 4, and a third portion 23 that joins the opposing surfaces of the folded bottom sheet 3. The first portion 21 has a strip shape that extends substantially linearly along direction Y from the upper end of the standing pouch 100 to the upper end of the steam passage mechanism 4, for example in a front view. In this embodiment, the first portion 21 is provided with a notch 21a for opening the standing pouch 100, but is not limited to this. The width of the first portion 21 along direction X may be the same or different. From the viewpoint of the strength of the steam passage mechanism 4, the width of the first portion 21 may be constant. The second portion 22 has a strip shape that extends substantially linearly along direction Y from the lower end of the steam passage mechanism 4 to the folded portion 3a of the bottom sheet 3, for example in a front view. The width of the second portion 22 along direction X may be the same or different. From the viewpoint of the strength of the steam passage mechanism 4, the width of the upper end portion of the second portion 22 may be the same as the width of the first portion 21. Also, the width of the upper end portion of the second portion 22 may be greater than the width of the lower end portion of the second portion 22. For example, the second portion 22 may narrow as it approaches the third portion 23 along direction Y. The third portion 23 extends along the right end of the folded bottom sheet 3, for example in a front view, and is connected to the second portion 22. The width of the third portion 23 along direction X may be the same or different. For example, in direction Y, the width of the upper end portion of the third portion 23 may be greater than the width of the lower end portion of the third portion 23.

[0023] As shown in Figures 1(a) and 2(a), the bottom seal 30 is provided by a part of the main sheet 1 and a part of the bottom sheet 3, and a part of the main sheet 2 and another part of the bottom sheet 3. The bottom seal 30 is formed, for example, by heat sealing the sealants contained in the main sheet 1 and the bottom sheet 3, and the sealants contained in the main sheet 2 and the bottom sheet 3, respectively. In a front view, the upper edge curve portion 30a of the bottom seal 30 becomes part of the inner edge of the bottom of the standing pouch 100 when the standing pouch 100 is in a self-supporting state. In a front view, the radius of curvature of the upper edge curve portion 30a is, for example, 40 mm or more and 70 mm or less. From the viewpoint of the bottom opening ability of the standing pouch 100, the above radius of curvature may be greater than 45 mm.

[0024] The bottom seal 30 has first side portions 31 and 32 that contact the first side seal 10, second side portions 33 and 34 that contact the second side seal 20, and central portions 35 and 36. The first side portions 31, 2 side portions 33, and central portion 35 are the parts that connect the main sheet 2 and the bottom sheet 3. The first side portions 32, 2 side portions 34, and central portion 36 connect the main sheet 2 and the bottom sheet 3. In a front view, the first side portions 31 and 32 have the same shape as the second side portions 33 and 34, and the central portions 35 and 36 have the same shape as the first side portions 31 and 32, 2 side portions 33 and 34, and central portions 35 and 36.

[0025] The first side portions 31 and 32 are parts that extend from the first side seal 10 to the central portions 35 and 36 in direction X. The width of each of the first side portions 31 and 32 along direction Y narrows as it approaches the central portions 35 and 36. The second side portions 33 and 34 are parts that extend from the second side seal 20 to the central portions 35 and 36 in direction X. The width of each of the second side portions 33 and 34 along direction Y narrows as it approaches the central portions 35 and 36. In each of the central portions 35 and 36, the minimum width along direction Y is, for example, 5 mm or more and 10 mm or less. This minimum width may be greater than 7 mm and 10 mm or less.

[0026] The steam venting mechanism 4 is a mechanism for discharging steam generated in the internal space S, and functions as part of the seal provided in the standing pouch 100 before steam discharge. The steam venting mechanism 4 is the first to open in the seal provided in the standing pouch 100 as the internal pressure of the internal space S rises. By providing such a steam venting mechanism 4 in the standing pouch 100, steam generated in the internal space S can be discharged only from the intended location. The shape of the steam venting mechanism 4 can take various forms. In this embodiment, the steam venting mechanism 4 has a seal portion 41 that is recessed from the outside to the inside along the direction X between the first portion 21 and the second portion 22 of the second side seal 20. The sealing strength of the seal portion 41 is the weakest in the second side seal 20 and weaker than the sealing strength of the first side seal 10 and the bottom seal 30. The tip portion 42 of the steam venting mechanism 4 is located in the main body sheets 1 and 2 at locations where stress is likely to concentrate when the internal pressure of the internal space S rises. In this embodiment, the height H3 of the steam venting mechanism 4 along direction Y corresponds to the distance from the lower end 100a of the standing pouch 100 to the front end 42 of the steam venting mechanism 4. In one example, the ratio of the height H3 of the steam venting mechanism 4 to the height H1 of the standing pouch 100 is 60% to 78%. In this case, the contents are sufficiently contained in the internal space S, while the tipping of the standing pouch 100 when steam is discharged from the steam venting mechanism 4 is effectively prevented. The height H4 of the steam venting mechanism 4 in the standing pouch 100A is the same as the height H3 of the steam venting mechanism 4 in the standing pouch 100, but is not limited to this.

[0027] In the steam passage mechanism 4, through holes 43 and 44 are provided outside the seal portion 41 to prevent the accumulation of steam discharged from the internal space S via the steam passage mechanism 4. Through hole 43 is provided in the main body sheet 1, and through hole 44 is provided in the main body sheet 2. The shape of the through holes 43 and 44 is not particularly limited.

[0028] In one example, the main sheets 1 and 2 and the bottom sheet 3 each have a laminated structure. The laminated structures of the main sheets 1 and 2 and the bottom sheet 3 can be arbitrarily selected. In this embodiment, the main sheets 1 and 2 and the bottom sheet 3 each have the same laminated structure, but are not limited to this. While the main sheets 1 and 2 have the same laminated structure, the laminated structure of the bottom sheet 3 may be different from that of the main sheets 1 and 2. Alternatively, the main sheets 1 and 2 and the bottom sheet 3 may each have different laminated structures.

[0029] Each of the main sheets 1 and 2 and the bottom sheet 3 includes, for example, an outermost layer, an intermediate layer, a sealant layer, a first adhesive layer, and a second adhesive layer. Each of the main sheets 1 and 2 and the bottom sheet 3 is manufactured by, for example, a dry lamination method, an extruder method, or a thermal lamination method. The first adhesive is a component that bonds the outermost layer and the intermediate layer, and is provided between the outermost layer and the intermediate layer. The second adhesive layer is a component that bonds the intermediate layer and the sealant layer, and is provided between the intermediate layer and the sealant layer. The first adhesive layer is, for example, a polyester-based adhesive. The second adhesive layer is, for example, a polyester-based adhesive.

[0030] The outermost layer is a layer that is mainly excellent in gas barrier properties, printability, and heat resistance. The outermost layer is, for example, a transparent vapor-deposited layer. An example of a material that makes up the outermost layer is polyethylene terephthalate with an inorganic thin film vapor-deposited on it (hereinafter referred to as "transparent vapor-deposited PET"). The intermediate layer is a layer that is mainly excellent in heat resistance and moisture resistance. An example of a material that makes up the intermediate layer is nylon. In one example, the material that makes up the intermediate layer is nylon with excellent tear resistance in the direction of resin flow (hereinafter referred to as "linear-cut NY"). Hereinafter, the direction of resin flow of the materials that make up the main sheets 1 and 2 will be referred to as the MD (Machine Direction) direction, and the direction perpendicular to the MD direction will be referred to as the TD (Transverse Direction) direction. The MD direction of the main sheets 1 and 2 contained in the standing pouch 100 corresponds to direction X. The TD direction of the main sheets 1 and 2 contained in the standing pouch 100 corresponds to direction Y.

[0031] The sealant layer is a layer with excellent heat resistance, heat sealability, and impact resistance. An example of a material constituting the sealant layer is unoriented polypropylene with excellent tear resistance in the MD direction (hereinafter referred to as "linearly cut CPP"). Excellent tear resistance in the MD direction means, for example, that the tear force conforming to the trouser tearing method specified in JIS K 7128-1:1998 is 1.2 N or less. In the trouser tearing method, a rectangular test specimen with a length of 50 mm in the TD direction and a length of 150 mm in the MD direction was cut 75 mm in the center, and the tear force in the MD direction was measured at a speed of 200 mm / min in a constant temperature room at 23°C. Linearly cut CPP contains, for example, 3 to 10 parts by weight of low-crystallinity ethylene-based elastomer per 100 parts by weight of propylene-ethylene block copolymer. The low-crystallinity ethylene-based elastomer has, for example, a density of 0.865 g / cm³. 3 More than 0.890g / cm 3 The following conditions apply, and the heat absorbed during the melting of the low-crystallinity ethylene-based elastomer as specified in JIS K 7122:2012 is 5 J / g or more and 30 J / g or less.

[0032] This paragraph describes examples of the use of the standing pouches 100 and 100A. Both the standing pouches 100 and 100A according to this embodiment can be heated in a microwave oven, as described above. For example, heating the standing pouch 100 in a microwave oven generates steam from its contents. The increase in internal pressure in the internal space S due to the generation of this steam causes the sealing portion 41 (especially the tip portion 42) of the steam venting mechanism 4 to rupture. As a result, the steam is discharged to the outside through the steam venting mechanism 4, suppressing the increase in internal pressure in the internal space S and preventing the standing pouch 100 from rupturing. Here, when steam is discharged to the outside from the internal space S through the steam venting mechanism 4, a thrust force is applied to the steam venting mechanism 4. In this embodiment, this thrust force can also be referred to as a horizontal force substantially along direction Z.

[0033] When the standing pouch 100 shown in Figures 2(a) and (b) is erected on a horizontal surface, the horizontal force applied to the steam venting mechanism 4 that causes the standing pouch 100 to tip over is 0.40 N or more. In this case, even if the width W1 and height H1 of the standing pouch 100 are within the above range (especially, if the width W1 is less than 140 mm and the height H1 is 150 mm or more), tipping over of the standing pouch 100 due to the thrust generated when the standing pouch 100 is heated in a microwave oven becomes less likely. From the viewpoint of preventing the standing pouch 100 from tipping over, the above horizontal force may be 0.48 N or more, 0.49 N or more, or 0.51 N or more. In one example, let d be the maximum depth at the bottom of the standing pouch 100, F be the height of the steam venting mechanism 4, and m be the weight of the standing pouch 100 filled with 180 ml of water. g In this case, the horizontal force P is given by the following equation 1. Equation 1: P=0.5m g d / F

[0034] When the standing pouch 100 shown in Figures 2(a) and (b) is erected on a horizontal plane, the angle (allowable angle) between the horizontal plane and the bottom of the standing pouch 100 when the standing pouch 100 falls over is, for example, 30° or more and 45° or less. The larger this allowable angle, the less likely the standing pouch 100 is to tip over even if it tilts. From the viewpoint of preventing the standing pouch 100 from tipping over, the allowable angle may be 34° or more, 35° or more, 38° or more, or 39° or more. In one example, the height of the center of gravity G of the standing pouch 100 in direction Y is g y In this case, the allowable angle θ is given by the following equation 2. Equation 2: θ = tan -1 (0.5d / g y )

[0035] Next, the effects and benefits of the standing pouches 100 and 100A according to this embodiment will be described. Each of the standing pouches 100 and 100A according to this embodiment can be placed on a display shelf or the like in a self-supporting state. Here, each of the standing pouches 100 and 100A, which are within the above-mentioned width W1 and height H1 range, can achieve narrowing of the width (i.e., width less than 140 mm) while maintaining the contents volume, provided that both of the above-mentioned horizontal force and angle conditions are met, thereby reducing the risk of the standing pouches 100 and 100A tipping over not only when stationary but also when heating.

[0036] In one example, the maximum depth d at the bottom of the standing pouch 100 is 55 mm or more, and the ratio of the height H3 of the steam venting mechanism 4 to the height H1 of the standing pouch 100 is 60% to 78%. In this case, the contents at the bottom of the standing pouch 100 can be increased, making it easier to lower the center of gravity G of the standing pouch 100. Therefore, the risk of the standing pouch 100 tipping over while stationary can be significantly reduced. In addition, the position of the steam venting mechanism 4 in the standing pouch 100 can be lowered. Therefore, the risk of the standing pouch 100 tipping over while heating can also be significantly reduced. Furthermore, the folding depth of the bottom sheet 3 may be 35 mm or more.

[0037] In one example, the bottom seal 30 is provided by a part of the main sheet 1 and a part of the bottom sheet 3, and a part of the main sheet 2 and another part of the bottom sheet 3. In a plan view, the radius of curvature of the upper edge curved portion 30a of the bottom seal 30 may be greater than 45 mm. Also, in a plan view, the minimum width of the center of the bottom seal 30 may be greater than 7 mm and 10 mm or less.

[0038] In one example, the portion of the first side seal 10 located below the steam passage mechanism 4 in the first part 11, and at least one of the second side seal 20 and the second part 22, may become narrower as they approach the bottom seal 30. In this case, the volume below the standing pouch 100 can be increased, making it easier to lower the center of gravity G of the standing pouch 100.

[0039] One aspect of the present invention is not limited to the above embodiments. One aspect of the present invention can be further modified without departing from its spirit. For example, in the above embodiments, a steaming mechanism is provided in the second side seal, but is not limited thereto. The steaming mechanism may be provided in the first side seal. Alternatively, the steaming mechanism may be provided in both the first side seal and the second side seal. That is, the standing pouch may have multiple steaming mechanisms. When a steaming mechanism is provided in both the first side seal and the second side seal, one steaming mechanism may have through holes only in the first sheet, and the other steaming mechanism may have through holes only in the second sheet. [Examples]

[0040] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0041] (Reference example 1) Figure 3 is a front view showing a two-dimensional model of the standing pouch in Reference Example 1. Figure 4(a) is a front view showing a three-dimensional model of the standing pouch in Reference Example 1, Figure 4(b) is a bottom view of the standing pouch shown in Figure 4(a), and Figure 4(c) is a side view of the standing pouch shown in Figure 4(a). Figure 3 shows the folded model 200, and Figures 4(a) to (c) show the model 200 in a self-standing state. It is assumed that the inflated model 200 contains 180 ml of water as its contents.

[0042] The standing pouch model 200 shown in FIGS. 3 and 4(a) to (c) has the same configuration as the standing pouches 100 and 100A according to the above embodiment. As shown in FIG. 3, in the folded model 200, the height A along the direction Y, the width B along the direction X, the folding depth C of the bottom material, the minimum width D of the bottom seal, the radius of curvature E of the upper edge curve portion of the bottom seal, and the height F of the ventilation mechanism are as shown in Table 1 below. Also, as shown in FIGS. 4(a) to (c), the maximum depth d at the bottom of the self-standing model 200 is as shown in Table 1 below.

[0043] The model 200 in Reference Example 1 was created by the finite element analysis software "LS-DYNA R13.1" manufactured by Ansys. In the self-standing model 200, the volume of the internal space below the ventilation mechanism was 277 cm 3 3. It was assumed that there was no anisotropy in the elastoplastic deformation characteristics of each sheet included in the model 200. In addition, the Young's modulus of each sheet at 90° C. measured along the method specified in JIS K 7127:1999 was 716 MPa. Also, the Poisson's ratio of each sheet was 0.35. The characteristics of each sheet of the standing pouches in each of the examples and Comparative Example 1 described later are the same as those of each sheet in Reference Example 1.

[0044] (Example 1) FIG. 5(a) is a front view showing a three-dimensional model of the standing pouch in Example 1, FIG. 5(b) is a bottom view of the standing pouch shown in FIG. 5(a), and FIG. 5(c) is a side view of the standing pouch shown in FIG. 5(a). The standing pouch model 300 shown in FIGS. 5(a) to (c) was formed by finite element analysis software in the same manner as in Reference Example 1. The height, width, folding depth of the bottom material, minimum width of the bottom seal, radius of curvature of the upper edge curve portion of the bottom seal, and height of the ventilation mechanism of the folded model 300 are as shown in Table 1 below. Also, the maximum depth d at the bottom of the self-standing model 300 is as shown in Table 1 below. In the self-standing model 300, the volume of the internal space below the ventilation mechanism was 198 cm 3That was it.

[0045] (Example 2) Although not shown in the figures, the standing pouch model in Example 2 has the same shape as Model 300 in Example 1 and was formed using finite element analysis software, similar to Example 1. The height, width, folding depth of the bottom material, minimum width of the bottom seal, radius of curvature of the upper edge curve of the bottom seal, and height of the ventilation mechanism of the folded model in Example 2 are as shown in Table 1 below. The maximum depth d at the bottom of the self-supporting Model 300 is as shown in Table 1 below.

[0046] (Example 3) Although not shown in the figures, the standing pouch model in Example 3 has the same shape as Model 300 in Example 1 and was formed using finite element analysis software, similar to Example 1. The height, width, folding depth of the bottom material, minimum width of the bottom seal, radius of curvature of the upper edge curve of the bottom seal, and height of the ventilation mechanism of the folded model in Example 3 are as shown in Table 1 below. The maximum depth d at the bottom of the self-supporting model in Example 3 is as shown in Table 1 below.

[0047] (Example 4) Although not shown in the figures, the standing pouch model in Example 4 has the same shape as Model 300 in Example 1 and was formed using finite element analysis software, similar to Example 1. The height, width, folding depth of the bottom material, minimum width of the bottom seal, radius of curvature of the upper edge curve of the bottom seal, and height of the ventilation mechanism of the folded model in Example 4 are as shown in Table 1 below. The maximum depth d at the bottom of the self-supporting model in Example 4 is as shown in Table 1 below.

[0048] (Comparative Example 1) The standing pouch model (not shown) in Comparative Example 1 has a different shape from Model 300 of Example 1 and was formed using finite element analysis software, similar to Example 1. Specifically, the model in Comparative Example 1 has a different shape from Models 200 and 300 and is provided with a ventilation mechanism located inside the side seal. The shape of the ventilation mechanism in the model in Comparative Example 1 is approximately arc-shaped when viewed from the front. In addition, a through hole is provided in the area enclosed by the side seal and the ventilation mechanism. Furthermore, the height, width, folding depth of the bottom material, minimum width of the bottom seal, radius of curvature of the upper edge curve of the bottom seal, and height of the ventilation mechanism of the folded model (not shown) of Comparative Example 1 are as shown in Table 1 below. The maximum depth d at the bottom of the model in the freestanding state of Comparative Example 1 is as shown in Table 1 below. Note that in the model in the freestanding state of Comparative Example 1, the volume of the internal space below the ventilation mechanism is 204 cm³. 3 That was it.

[0049] (Center of gravity height of standing pouch) The center of gravity position of the standing pouch models in Reference Example 1, Examples 1-4, and Comparative Example 1, when they are self-supporting on a horizontal plane and contain 180 ml of water, was determined using Ansys' finite element analysis software "LS-DYNA R13.1". The center of gravity height g for Reference Example 1, Examples 1-4, and Comparative Example 1 y This is as shown in Table 1 below.

[0050] (Allowable angle of standing pouch) The allowable angle of the standing pouch was confirmed using Ansys' finite element analysis software "LS-DYNA R13.1". It was assumed that no deformation occurred in the standing pouch during the confirmation of the allowable angle. Figures 6(a) and 6(b) are diagrams illustrating the allowable angle of the standing pouch. Figures 6(a) and 6(b) show Model 200 of Reference Example 1. Figure 6(a) shows Model 200 standing upright on the horizontal plane HS with 180 ml of water as its contents. Figure 6(b) shows the state when the tilted Model 200 falls over. In both Figures 6(a) and 6(b), the point indicated by the white circle O is considered the origin. As shown in Figure 6(b), the Model 200 is tilted around the white circle ○ as an axis, and the allowable angle Φ between the horizontal plane HS and the bottom of Model 200 when Model 200 falls over is shown in Table 1 below. The allowable angle Φ corresponds to the angle at which the center of gravity G exceeds the dashed line BL. The allowable angles of the standing pouches in Examples 1-4 and Comparative Example 1 were also confirmed using the same method. The allowable angles in Examples 1-4 and Comparative Example 1 are shown in Table 1 below.

[0051] (Allowable horizontal force of standing pouch) The allowable horizontal force of the standing pouch was confirmed using Ansys' finite element analysis software "LS-DYNA R13.1". It was assumed that no deformation occurred in the standing pouch during the confirmation of the allowable horizontal force. Figures 7(a) and 7(b) are diagrams illustrating the allowable horizontal force of the standing pouch. Figures 7(a) and 7(b) show Model 200 of Reference Example 1. Figure 7(a) shows Model 200 in a self-supporting state, standing upright on a horizontal plane HS with 180 ml of water as its contents. Figure 7(b) shows the state when Model 200 falls over. In Figures 7(a) and 7(b), a white circle O is also shown. The horizontal force P1 shown in Figure 7(a) is applied to the ventilation mechanism of Model 200. The horizontal force P (allowable horizontal force) when Model 200 falls over is shown in Table 1 below. The allowable horizontal force of the standing pouch in each of Examples 1-4 and Comparative Example 1 is also shown in Table 1 below.

[0052] [Table 1] [Explanation of Symbols]

[0053] 1...Main sheet (first sheet), 2...Main sheet (second sheet), 3...Bottom sheet, 3a...Folded section, 4...Steaming mechanism, 10...First side seal, 11...First section, 11a, 21a...Notch, 12...Second section, 20...Second side seal, 21...First section, 22...Second section, 23...Third section, 30...Bottom seal, 30a...Upper edge curved section, 31, 32...First side section, 33, 34...Second side section, 35,36...Center section, 41...Seal section, 42...Tip section, 43,44...Through hole, 100,100A...Standing pouch, 100a...Bottom end, 100b...Top end, 200,300...Model, BL...Dashed line, d...Maximum depth, G...Center of gravity, H1~H4...Height, HS...Horizontal plane, O...White circle, P,P1...Horizontal force, S...Internal space, W1,W2...Width, Φ...Allowable angle.

Claims

1. The first sheet and the second sheet are erected upright against each other, A bottom sheet is bonded to the first sheet and the second sheet, and is folded in a V-shape when viewed from the side, A steam venting mechanism for discharging steam from the internal space defined by the first sheet, the second sheet, and the bottom sheet, A standing pouch equipped with, In a front view, a first side seal is provided on the left edge of the first sheet and the second sheet, and a second side seal is provided on the right edge of the first sheet and the second sheet. The steaming mechanism is provided in either the first side seal or the second side seal. The width of the standing pouch is 110 mm or more and less than 140 mm. The height of the standing pouch is 150 mm or more and 180 mm or less. When 180 ml of water is contained in the internal space and the bottom sheet is released so that the standing pouch is erected on a horizontal surface, the horizontal force applied to the steaming mechanism that causes the standing pouch to tip over is 0.40 N or more. Standing pouch.

2. The standing pouch according to claim 1, wherein the horizontal force is 0.48 N or more.

3. A standing pouch according to claim 1 or 2, wherein 180 ml of water is contained in the internal space as the contents, and when the folding of the bottom sheet is released and the standing pouch is erected on a horizontal surface, the angle between the horizontal surface and the bottom of the standing pouch when the standing pouch falls over is 30° or more and 45° or less.

4. The standing pouch according to claim 3, wherein the angle is 35° or more and 45° or less.

5. The maximum depth at the bottom of the aforementioned standing pouch is 55 mm or more. The standing pouch according to claim 1 or 2, wherein the ratio of the height of the steaming mechanism to the height of the standing pouch is 60% or more and 78% or less.

6. The standing pouch according to claim 5, wherein the folding depth of the bottom sheet is 35 mm or more.

7. A bottom seal is provided by a part of the first sheet and a part of the bottom sheet, and a part of the second sheet and another part of the bottom sheet. The standing pouch according to claim 1 or 2, wherein, in a front view, the radius of curvature of the upper edge curve of the bottom seal is greater than 45 mm.

8. The standing pouch according to claim 7, wherein, in a front view, the minimum width at the center of the bottom seal is greater than 7 mm and 10 mm or less.

9. The standing pouch according to claim 7, wherein in at least one of the first side seal and the second side seal, the portion located below the steam passage mechanism narrows as it approaches the bottom seal.

Images