Standing pouch

Abstract

To provide a standing pouch capable of achieving both strength against falling and a content storage property.SOLUTION: The container body 10 of the standing pouch 1 has a side seal part 15,15 in which side parts of two side wall sheets are directly joined to each other, and a bottom seal part 20 in which each of the side wall sheets and a bottom surface sheet are joined to each other. The bottom seal line 21 forming the upper edge of the bottom seal portion 20 has, on both sides of the center line CL, side curved lines 22 adjacent to the side seal portions 15 in the width direction Y and a center curved line 23 located below the side curved lines 22 and on the center side in the width direction Y. A tangent line at the vertex of the side curved line 22 is inclined with respect to the width direction Y, and an end portion of the side curved line 22 on the outer side in the width direction is inclined with respect to the width direction Y. The half-width W5 of the standing pouch 1 is 2.00 times or more of the height H1 of the bottom surface sheet in a two folded state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a stand-up pouch having a container body with an internal space for accommodating contents. [Background technology]

[0002] A stand-up pouch comprises a container body for accommodating the contents and a spout provided at the top end or corner of the container body. The container body of a stand-up pouch is formed by joining flexible films together, and generally has a pair of side seals along the sides of the container body and a bottom seal formed at the bottom of the container body. Various studies have been conducted on the shape of this bottom seal.

[0003] For example, Patent Document 1 discloses a standing pouch in which a bottom seal portion is formed by joining a bottom member and a body member, the resin layer of which is made only of polyethylene-based resin, and the boundary portion between the bottom seal portion and the unsealed portion is convex upward near the point where it meets the body seal portion where the left and right peripheral edges of the body member are joined together.

[0004] Patent Document 2 also discloses a standing pouch in which the bottom seal line near the seal intersection between the bottom seal line and the side seal line is a convex curve that is convex upward, and the tangent line of the convex curve at the seal intersection is formed parallel to the ridge line of the bottom tape, and in which the bottom surface in a filled state is aligned with any position on the bottom center line in the width direction, and the proportion of areas with a height difference of more than 1 mm is 30% or less of the bottom surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-072823 [Patent Document 2] Japanese Patent Publication No. 2023-010853 Summary of the Invention [Problem to be solved by the invention]

[0006] To prevent the pouch from breaking due to dropping or the like, the stand-up pouches disclosed in Patent Documents 1 and 2 have an upper edge of the bottom seal formed by joining flexible films that has an upwardly convex curve. However, these stand-up pouches have room for improvement in terms of strength against drops, and providing an upwardly convex curve on the upper edge of the bottom seal sometimes reduces the space available for accommodating contents at the bottom end of the stand-up pouch. In other words, the technologies disclosed in Patent Documents 1 and 2 are insufficient in achieving both drop resistance and content capacity for the stand-up pouch.

[0007] The present invention relates to a stand-up pouch that is strong enough to withstand being dropped and has a large capacity to accommodate contents. [Means for solving the problem]

[0008] The present invention relates to a stand-up pouch having a container body with an internal space for accommodating contents. In one embodiment, the container body has a pair of opposing side walls and a bottom crotch portion connecting the side walls at the lower end of the container body, and preferably has a width direction that is left and right relative to the side walls and a depth direction that is perpendicular to the width direction. In one embodiment, it is preferable that each of the pair of side walls is formed by a side wall sheet, and the bottom gusset portion is formed by a bottom sheet. In one embodiment, the container body preferably has a side seal portion in which the sides of the two side wall sheets are directly joined together, and a bottom seal portion in which each of the side wall sheets is joined to the bottom sheet interposed between the side wall sheets in a folded state. In one embodiment, the bottom seal line forming the upper edge of the bottom seal portion preferably has, on each side of a center line that divides the bottom seal line into two equal parts in the width direction, a side curved line that is located on the side seal portion side in the width direction and curves in a convex shape diagonally upward, and a center curved line that is located below the side curved line and toward the center in the width direction and curves in a convex shape diagonally downward. In one embodiment, the side curvature line is preferably adjacent to the side seal portion in the width direction. In one embodiment, it is preferable that a tangent to the apex of the side curved line is inclined with respect to the width direction. In one embodiment, a tangent to the side curved line at an outer end in the width direction is preferably inclined with respect to the width direction. In one embodiment, the half width of the standing pouch, which is the length between the outer end of the bottom seal portion and the center line in the width direction, is preferably 2.00 times or more the height of the bottom sheet in the folded state.

[0009] The present invention also relates to a standing pouch having a container body with an internal space for accommodating contents. In one embodiment, the container body has a pair of opposing side walls and a bottom crotch portion connecting the side walls at the lower end of the container body, and preferably has a width direction that is left and right relative to the side walls and a depth direction that is perpendicular to the width direction. In one embodiment, it is preferable that each of the pair of side walls is formed by a side wall sheet, and the bottom gusset portion is formed by a bottom sheet. In one embodiment, the container body preferably has a side seal portion in which the sides of the two side wall sheets are directly joined together, and a bottom seal portion in which each of the side wall sheets is joined to the bottom sheet interposed between the side wall sheets in a folded state. In one embodiment, the bottom seal line forming the upper edge of the bottom seal portion preferably has, on each side of a center line that bisects the bottom seal line in the width direction, a side curved line that is located on the side seal portion side in the width direction and curves in a convex shape diagonally upward, and a central curved line that is located below the side curved line and toward the center in the width direction and curves in a convex shape diagonally downward, and further preferably has a side straight line that is parallel to the width direction and closer to the side seal portion than the side curved line. In one embodiment, it is preferable that a tangent to the apex of the side curved line is inclined with respect to the width direction. In one embodiment, a tangent to the side curved line at an outer end in the width direction is preferably inclined with respect to the width direction. In one embodiment, the half width of the standing pouch, which is the length between the outer end of the bottom seal portion and the center line in the width direction, is preferably 2.00 times or more the height of the bottom sheet in the folded state. [Effects of the Invention]

[0010] The standing pouch of the present invention can achieve both strength against dropping and capacity to accommodate contents. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing one embodiment of a standing pouch according to the present invention, and is a front view seen from one side wall side. [Figure 2] FIG. 2 is a cross-sectional view taken along the depth direction, showing the state of bonding of the bottom seal portion at the bottom of the standing pouch of FIG. [Figure 3] FIG. 3 is a front view showing the bottom seal portion of FIG. [Figure 4] FIG. 4 is an enlarged front view showing the side curvature lines of FIG. [Figure 5] FIG. 5 is an enlarged front view showing the central curved line of FIG. [Figure 6]6A and 6B are diagrams showing the expanded state of the standing pouch shown in FIG. 1, where FIG. 6A is a horizontal cross-sectional view at the intersection position, and FIG. 6B is a front view. [Figure 7] 7(a) and (b) are views corresponding to FIGS. 6(a) and (b) of a standing pouch having a bottom seal line without side curvature lines. [Figure 8] FIG. 8 is a view corresponding to FIG. 3 and showing another embodiment of the standing pouch according to the present invention. [Figure 9] FIG. 9 is a view corresponding to FIG. 3, showing still another embodiment of a standing pouch according to the present invention. [Figure 10] FIG. 10 is a front view showing yet another embodiment of the bottom seal according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will now be described based on preferred embodiments with reference to the drawings. Figures 1 to 6 show one embodiment of a standing pouch of the present invention. 1 and 2, the standing pouch 1 of this embodiment includes a container body 10 having an internal storage space S for the contents, and a spout 12 for spouting the contents to the outside of the container body 10. In the standing pouch 1 of this embodiment, the container body 10 has a quadrangular shape when viewed from the front, and the spout 12 is provided at one of the four corners located at the top.

[0013] In the standing pouch 1 of this embodiment, the container body 10 has a bottom 19 that serves as a contact surface, and the standing pouch 1 can stand on its own by placing the bottom 19 on a horizontal surface. In this free-standing state, the height direction X of the standing pouch 1 coincides with the vertical direction. That is, the bottom 19 of the standing pouch 1 faces downward, and the opposite side of the bottom 19 in the height direction of the standing pouch 1 (for example, the side of the spout 12) faces upward. Hereinafter, unless otherwise specified, the description of the standing pouch 1 of the embodiment shown in Figures 1 to 5 will be a description of the standing pouch 1 in a free-standing state.

[0014] The container body 10 has a pair of opposing side walls 11, 11, and a bottom gusset portion 13 that connects the side walls 11, 11 at the lower end of the container body 10. The standing pouch 1 of this embodiment has a width direction Y that is the left-right direction relative to the side walls 11, 11, and a depth direction Z that is perpendicular to the width direction Y. The width direction Y and depth direction Z of the standing pouch 1 coincide with the horizontal direction. Furthermore, a vertical direction X1 that is the up-down direction relative to the side walls 11, 11 coincides with the height direction of the standing pouch 1.

[0015] 2, in the standing pouch 1 of this embodiment, the lower ends of the side walls 11, 11 and the bottom gusset 13 form the bottom 19 of the container body 10, and the pair of side walls 11, 11 stand upright from the bottom gusset 13 (bottom 19). The pair of side walls 11, 11 of the standing pouch 1 are arranged opposite each other in the depth direction Z, and the bottom gusset 13 is disposed between the lower ends of these side walls 11, 11. The container body 10 has a space defined by the pair of side walls 11, 11 and the bottom gusset 13, and this space serves as a storage space S for the contents.

[0016] The container body 10 is formed from a flexible film. More specifically, the pair of side walls 11, 11 are formed from a pair of side wall sheets 16, 16, and the bottom gusset portion 13 is formed from a bottom sheet 17, with the side wall sheets 16, 16 and the bottom sheet 17 being made from flexible film. The bottom sheet 17 is folded in half and interposed between the pair of side wall sheets 16, 16 at their lower ends (see FIG. 2). The container body 10 is formed into a bag shape by joining the pair of side wall sheets 16, 16 and the bottom sheet 17.

[0017] The container body 10 has seal portions 15, 15, 14t, 14c, and 20 formed by joining flexible films together. More specifically, the container body 10 has a pair of side seal portions 15, 15 formed by directly joining the side portions of two side wall sheets 16, 16, an upper seal portion 14t that joins the upper ends of the pair of side wall sheets 16, 16, a spout-portion fixed seal portion 14c in which the spout 12 is disposed, and a bottom seal portion 20 located at the bottom 19. The bottom seal portion 20 joins the lower end portions of the side wall sheets 16, 16 to the lower end portion of the bottom sheet 17, which is folded in half (hereinafter simply referred to as the "folded in half") and interposed between the side wall sheets 16, 16. The bottom sheet 17 has a fold 17t formed along the width direction Y.

[0018] The side seal portions 15 extend in the vertical direction X1, forming a cylindrical shape for the pair of side walls 11. The pair of side seal portions 15 extend outward (downward) in the vertical direction X1 from the upper edge of the bottom seal portion 20 (a bottom seal line 21, described below). At the portions where the pair of side seal portions 15 overlap the bottom seal portion 20 in the vertical direction X1, they join together the sides of the pair of side wall sheets 16 and the sides of the bottom sheet 17 in the folded state. More specifically, when the bottom sheet 17, folded in half along a fold 17t extending in the width direction Y, is divided into a front half 17f on one side wall 11 side and a rear half 17r on the other side wall 11 side, the pair of side seal portions 15 join together the sides of the front half 17f and the rear half 17r of the bottom sheet 17 (not shown). Meanwhile, the front half 17f and the rear half 17r of the folded bottom sheet 17 are not joined between the pair of side seal portions 15, 15 in the width direction Y (see FIG. 2). As a result, when the standing pouch 1 is filled, the weight of the contents filled in the storage space S causes the folded state of the bottom sheet 17 to be released, and the sheet 17 is unfolded so that it is parallel to the ground surface. The upper end of one side seal portion 15 is connected to the spout-portion stationary seal portion 14c, and the upper end of the other side seal portion 15 is connected to the upper seal portion 14t.

[0019] The upper seal portion 14t joins the upper edge portions of the two side wall sheets 16, 16 and extends in the width direction Y. One end of the upper seal portion 14t is connected to the upper end of one of the side seal portions 15, and the other end of the upper seal portion 14t is connected to one end of the spout-portion fixed seal portion 14c. The upper edge of the upper seal portion 14t in this embodiment forms the upper edge of the standing pouch 1.

[0020] The spout-portion stationary seal portion 14c of this embodiment joins two side wall sheets 16, 16 together near one corner on the upper end side of the standing pouch 1. The spout-portion stationary seal portion 14c extends in one direction near the corner where the spout-portion 12 is located, forming an angle with respect to both the vertical direction X1 and the width direction Y. In other words, the spout-portion stationary seal portion 14c extends in a direction oblique to both the vertical direction X1 and the width direction Y. As a result, the container body 10 of this embodiment has a rectangular shape with the corner where the spout-portion 12 is located cut out. The spout-portion stationary seal portion 14c of this embodiment has one end connected to the upper seal portion 14t and the other end connected to the other side seal portion 15.

[0021] The bottom seal portion 20 has a front bottom seal portion 20f located on one side wall 11 side in the depth direction Z, and a rear bottom seal portion 20r located on the other side wall 11 side (see FIG. 2). The front bottom seal portion 20f joins the lower end of the side wall sheet 16 forming one side wall 11 to the front half of the bottom sheet 17. The rear bottom seal portion 20r joins the lower end of the side wall sheet 16 forming the other side wall 11 to the rear half of the bottom sheet 17. The lengths of the bottom seal portions 20, i.e., the front bottom seal portion 20f and the rear bottom seal portion 20r, in the longitudinal direction X1 gradually decrease inward in the width direction Y. As a result, in a front view of the standing pouch 1, a generally mountain-shaped unsealed portion that protrudes downward is formed at the lower end of the standing pouch 1. In this unsealed portion, the side wall sheets 16, 16 and the bottom sheet 17 are not joined. In a front view of the standing pouch 1, the width direction Y is the left-right direction, and the standing pouch 1 is viewed from the depth direction Z (see FIG. 1). The lower edge of the bottom seal portion 20 (front bottom seal portion 20f and rear bottom seal portion 20r) forms the periphery of the bottom gusset portion 13 in a bottom view of the standing pouch 1, and is placed on a horizontal surface in a free-standing state.

[0022] The bottom seal portion 20 has a bottom seal line 21 that forms the upper edge of the bottom seal portion 20. More specifically, the front bottom seal portion 20f and the rear bottom seal portion 20r each have a bottom seal line 21. The following description of the bottom seal line 21 applies to the bottom seal lines of the front bottom seal portion 20f and the rear bottom seal portion 20r. The bottom seal line 21 corresponds to the lower edge of the non-sealed portion described above. In a front view of the stand-up pouch 1, the bottom seal line 21 forms a generally mountain-shaped curve that protrudes downward (see FIG. 3). Unless otherwise specified, the following description of the bottom seal line 21 will be based on the front view of the stand-up pouch 1 (see FIGS. 2, 3, and 6).

[0023] On both sides of the standing pouch 1 in the width direction Y, the bottom seal portion 20 overlaps with the side seal portion 15, and the position of the inner side edge of the side seal portion 15 in the width direction Y corresponds to the outer end e1 of the bottom seal line 21 in the width direction Y (see FIG. 3). The outer end e1 of the bottom seal line 21 in the width direction Y (hereinafter simply referred to as the "outer end e1") is located at the same position in the longitudinal direction X1 as the fold 17t of the bottom sheet 17 in the folded state. The bottom seal portion 20 and the side seal portion 15 overlap each other outward in the width direction Y from the outer end e1. Hereinafter, the position of the upper end of the overlapping portion between the bottom seal portion 20 and the side seal portion 15 will be referred to as the "intersection position P." The intersection position P is located at the same position in the longitudinal direction X as the outer end e1.

[0024] As shown in FIG. 3 , a straight line CL that bisects the bottom seal line 21 in the width direction Y and extends in the longitudinal direction X1 is assumed to be the center line CL. The bottom seal line 21 is symmetrical with respect to the center line CL and forms a downwardly convex, approximately parabolic shape with a vertex e3 at the center line CL. The bottom seal line 21 has, on each side of the center line CL, side curved lines 22 that curve in a convex shape obliquely upward and a central curved line 23 that curves in a convex shape obliquely downward. In the width direction Y, the central curved line 23 is located closer to the center line CL than the side curved lines 22. In this embodiment, the bottom seal line 21 has two central curved lines 23 between two side curved lines 22 in the width direction Y, and the center line CL is located between the two central curved lines 23. In the bottom seal line 21, the side curved line 22 and the central curved line 23 are continuous with each other via an inflection point e2.

[0025] In the bottom seal line 21, the side curved line 22 is located on the side seal portion 15 side in the width direction Y. In this embodiment, the outer end of the side curved line 22 in the width direction Y is the outer end e1 of the bottom seal line 21. That is, the side curved line 22 in this embodiment is a continuous line with a substantially arc shape between the outer end e1 of the bottom seal line 21 and the inflection point e2. The side curved line 22 is a curved line that is convex upward and toward the center line CL (inward in the width direction Y), and the vertex 22t of the side curved line 22 is located below the fold 17t of the bottom sheet 17 (see FIG. 4). The vertex 22t of the side curved line 22 is located at the point (point) where the distance from the straight line La connecting both ends of the side curved line 22 is greatest. The ends of the side curved line 22 in this embodiment are the outer end e1 and the inflection point e2 of the bottom seal line 21.

[0026] As shown in Fig. 4, the tangent line Lb at the vertex 22t of the side curvature line 22 (hereinafter also referred to as "side tangent line Lb") is inclined with respect to the width direction Y. In other words, the side tangent line Lb is not parallel to the width direction Y and has an angle with respect to the width direction Y. The side tangent line Lb can be found by expressing the side curvature line 22 as a function and calculating the equation of the tangent line based on this function. From the viewpoint of further improving drop strength described later, the inclination angle θ1 (see FIG. 4) of the side tangent Lb with respect to the width direction Y is preferably 10° or more and 80° or less, more preferably 20° or more and 60° or less.

[0027] As shown in Fig. 4, the tangent line Lc (hereinafter also referred to as the "outer tangent line Lc") at the outer end e1 in the width direction Y of the side curved line 22 is inclined with respect to the width direction Y. In this embodiment, the outer tangent line Lc is inclined so as to move away from the lower edge of the bottom seal portion 20 in the longitudinal direction X as it extends outward in the width direction Y. In other words, the outer tangent line Lc forms a straight line that extends diagonally upward outward in the width direction Y. The outer tangent line Lc is not parallel to the width direction Y and has an angle with respect to the width direction Y. Like the side tangent line Lb, the outer tangent line Lc is also determined based on a function representing the side curvature line 22. From the viewpoint of further improving the drop strength described later, the inclination angle θ2 (see FIG. 4) of the outer tangent Lc with respect to the width direction Y is preferably 1° or more and 60° or less, more preferably 5° or more and 40° or less, and even more preferably 25° or more and 40° or less.

[0028] The intersection of the lower edge of the bottom seal portion 20 and the center line CL is defined as the "lower end center point e4" (see FIG. 3). Also, the straight line BL connecting the outer edge e5 in the width direction Y of the intersection position P and the lower end center point e4 is defined as the "reference line BL" (see FIG. 3). The reference line BL is inclined with respect to the width direction Y. In this embodiment, the inclination angle θ2 (see FIG. 4) of the outer tangent line Lc relative to the width direction Y is smaller than the inclination angle θ4 (see FIG. 4) of the reference line BL relative to the width direction Y. 10, the inclination angle θ2 of the outer tangent line Lc with respect to the width direction Y may be equal to or greater than the inclination angle θ4 of the reference line BL with respect to the width direction Y (θ2≧θ4). This configuration is preferable because it can further prevent bending of the side seal portion 15 near the intersection position P, and it also makes it easier for impacts caused by the load of the contents, which will be described later, to be dissipated along the side seal portion 15, thereby further improving drop strength. To further enhance the above-mentioned effect, the inclination angle θ2 (see FIG. 10) of the outer tangent Lc relative to the width direction Y is preferably 1 to 1.4 times the inclination angle θ4 (see FIG. 10) of the reference line BL relative to the width direction Y.

[0029] The central curved line 23 of the bottom seal line 21 is located below the side curved lines 22 and toward the center in the width direction Y. The central curved line 23 is a continuous line in a substantially arc shape between the inflection point e2 and the vertex e3 of the bottom seal line 21 (see FIG. 5). The central curved line 23 is a curved line that is convex downward and toward the side seal portion 15 (outward in the width direction Y), and the vertex 23t of the central curved line 23 is located below the vertex 22t of the side curved line 22. The vertex 23t of the central curved line 23 is located at the point (point) where the distance from the straight line Ld connecting both ends of the central curved line 23 is greatest. The ends of the central curved line 23 in this embodiment are the inflection point e2 and the vertex e3 of the bottom seal line 21.

[0030] The standing pouch 1 of this embodiment is expanded when the internal storage space S is filled with contents such as liquid detergent. In the expanded standing pouch 1, the bottom sheet 17 is unfolded and unfolded, and the pair of side walls 11, 11 expand in the depth direction Z so as to move away from each other (see FIG. 6). The weight of the contents is likely to be applied to the lower end of the standing pouch 1, and the side walls 11, 11 open up so that the distance between them in the depth direction Z gradually increases from the intersection position P toward the center line CL (see FIG. 6(a)). In the standing pouch 1 of this embodiment, the bottom seal line 21 has side curved lines 22 that convex obliquely upward, thereby reducing the gap between the side walls 11, 11 (the angle between the side walls 11, 11) at the intersection point P, and the central curved line 23 that convex obliquely downward allows the storage space S (unsealed portion) defined by the central curved line 23 to expand outward in the width direction Y, thereby increasing the capacity for storing contents. As shown in FIG. 6( a), in a horizontal cross section at the intersection point P, this standing pouch 1 has an elliptical (approximately lemon-shaped) shape with tapered ends in the width direction Y. Furthermore, because the side curved lines 22 and the central curved line 23 are continuous via the inflection point e2, even if the expanded standing pouch 1 is dropped, the impact caused by the weight of the contents is easily deflected along the bottom seal line 21 toward the center line CL. This prevents the impact from being concentrated at the intersection position P when dropped, and the bonded state of the bottom seal portion 20 at the intersection position P, i.e., the bonded state between the side wall sheet 16 and the bottom sheet 17 at the intersection position P, can be maintained in a good condition. In this way, the standing pouch 1 of this embodiment can increase the capacity of the storage space S (unsealed portion) while preventing the side walls 11, 11 from opening excessively at the intersection position P, thereby achieving both drop resistance and content storage capacity. Hereinafter, drop resistance will also be simply referred to as "drop strength."

[0031] On the other hand, as shown in Figure 7, if the bottom seal line 21' does not have the side curved line 22 and the central curved line 23, the opening between the side walls 11, 11 at the intersection position P in the expanded state (the angle between the side walls 11, 11) tends to become excessively large (see Figure 7(a)), and the horizontal cross-sectional shape at the intersection position P becomes close to a perfect circle. In such a standing pouch 1', the side wall sheet 16 and the bottom sheet 17 tend to peel away from each other, and the bag is likely to break at the intersection position P due to the impact when dropped.

[0032] From the viewpoint of further improving the drop strength and the appearance of the standing pouch 1, it is preferable that the side curved line 22 be adjacent to the side seal portion 15 in the width direction Y (see FIG. 4). That is, it is preferable that the outer end of the side curved line 22 in the width direction Y forms the outer end e1 in the width direction Y of the bottom seal line 21. This makes it less likely that wrinkles will form in the width direction Y on the side wall 11 near the intersection position P, improving the appearance of the standing pouch 1. When the side curved line 22 is adjacent to the side seal portion 15 in the width direction Y, there is no inclined straight portion extending downward from the intersection position P and constituting part of the bottom seal line 21 between the intersection position P in the width direction Y and the side curved line 22, and the outer end of the side curved line 22 in the width direction Y is directly connected to the intersection position P.

[0033] In this embodiment, the tangent line Le at the vertex 23t of the central curved line 23 (hereinafter also referred to as the "central tangent line Le") is inclined with respect to the width direction Y, as shown in Fig. 5. In other words, the central tangent line Le is not parallel to the width direction Y and has an angle with respect to the width direction Y. The central tangent line Le can be found by expressing the central curved line 23 as a function and calculating the equation of the tangent line based on this function. To further improve drop strength and storage capacity, the central tangent line Le has an inclination angle θ3 (see FIG. 5) with respect to the width direction Y of preferably 20° to 60°, more preferably 30° to 50°. From the same viewpoint as above, it is preferable that the inclination angle θ3 of the central tangent Le relative to the width direction Y is greater than or equal to the inclination angle θ1 of the side tangent Lb relative to the width direction Y (θ3≧θ1), and it is more preferable that it is greater than the inclination angle θ1 (θ3>θ1).

[0034] From the viewpoint of further improving drop strength, it is preferable that the apex 23t of the central curved line 23 is located more inward in the width direction Y than the apex 22t of the side curved line 22. With this configuration, the curve of the entire bottom seal line 21 becomes gentler, making it easier to absorb impacts caused by the weight of the contents. From the same viewpoint as above, the distance D1 (see FIG. 3) between the vertex 23t of the central curved line 23 and the vertex 22t of the side curved line 22 in the width direction Y is preferably 5% to 80% of the half-width W2 (see FIG. 3) of the bottom seal line 21. This configuration further suppresses the opening in the depth direction Z between the side walls 11 at the intersection position P. Furthermore, the impact on the bottom seal portion 20 when the standing pouch 1 is dropped can be further dispersed, thereby further mitigating the impact. The half-width W2 of the bottom seal line 21 is half the length of the full width (total length in the width direction Y) of the bottom seal line 21. From the same viewpoint as above, it is preferable that the side curved line 22 has the following configuration. The distance D3 (see FIG. 3) between the outer side edge of the side seal portion 15 and the vertex 22t of the side curved line 22 in the width direction Y is preferably 15% to 50%, and more preferably 25% to 40%, of the half width W5 (see FIG. 3) of the standing pouch 1. The half width W5 of the standing pouch 1 is half the length of the total width W of the standing pouch 1, and is the length in the width direction Y between the outer edge of the bottom seal portion 20 and the center line CL.

[0035] From the viewpoint of making it easier to dissipate the impact at the central curved line 23 when dropped and further improving the drop strength, it is preferable that the radius of curvature r at the apex of the central curved line 23 be larger than that of the side curved lines 22. In this case, the radius of curvature r at the apex 23t of the central curved line 23 is preferably 1.05 to 1.5 times, more preferably 1.1 to 1.3 times, the radius of curvature r at the apex 22t of the side curved line 22. From the viewpoint of further improving the drop resistance at the central curved line 23 or the intersection position P, and from the viewpoint of making it easier to ensure the capacity for storing contents, it is preferable that the radius of curvature r at the vertex of each curved line 22, 23 be within the following range. The radius of curvature r at the vertex 23t of the central curved line 23 is preferably 20% or more and 60% or less, more preferably 30% or more and 50% or less of the total width W of the standing pouch 1. The radius of curvature r at the vertex 22t of the side curved line 22 is preferably 20% or more and 60% or less, more preferably 30% or more and 50% or less of the total width W of the standing pouch 1. The radius of curvature r at the vertex 23t of the central curved line 23 is preferably 40 mm or more and 80 mm or less. The radius of curvature r at the vertex 22t of the side curved line 22 is preferably 50 mm or more and 70 mm or less.

[0036] In order to further prevent the side walls 11, 11 from opening too much in the depth direction Z of the expanded standing pouch 1 and further improve drop strength, the half width W5 (see FIG. 3) of the standing pouch 1 is preferably 2.00 times or more, more preferably 2.00 to 3.00 times, and even more preferably 2.00 to 2.30 times the height H1 (see FIG. 3) of the bottom sheet 17 in the folded state. This configuration more effectively prevents the side walls 11, 11 from opening at the outer end e1 of the bottom seal line 21, and also makes it less likely for wrinkles to form in the side walls 11, thereby further improving the appearance of the standing pouch 1. The half width W5 of the standing pouch 1 is half the total length in the width direction Y of the pair of side seal portions 15, 15 and the bottom seal portion 20 (the total width W of the standing pouch 1). The height H1 of the bottom sheet 17 in the folded state is the height of the bottom sheet 17 in the folded state before unfolding, and is the length between the fold 17t in the longitudinal direction X and the lower edge of the bottom seal portion 20. From the same viewpoint as above, it is preferable that the half width W5 and the height H1 are within the following ranges. The half width W5 (see FIG. 3) of the standing pouch 1 is preferably 70 mm or more and 150 mm or less, and more preferably 75 mm or more and 130 mm or less. The height H1 (see FIG. 3) of the bottom sheet 17 in the folded state is preferably 30 mm or more and 80 mm or less, and more preferably 40 mm or more and 70 mm or less.

[0037] The flexible film forming the container body 10 is made of a synthetic resin film material, and may be, for example, a single-layer resin film or a multi-layer laminate film. The flexible film is the film material used for the side wall sheets 16, 16 and the bottom sheet 17.

[0038] When a laminated film is used as the flexible film, it can be one in which a fusion layer 32 that forms seal portions such as the side seal portion 15 and the bottom seal portion 20 is laminated with a resin layer 31. The side wall sheet 16 and the bottom sheet 17 of this embodiment are each formed of a laminated film in which the fusion layer 32 and the resin layer 31 are laminated (see FIG. 2). It is preferable that such a laminated film is arranged so that the fusion layer 32 forms the inner surface of the container body 10. From the viewpoint of further improving the sealing property, the fusion layer 32 is preferably a polyethylene-based resin. Examples of polyethylene-based resins include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ultra-low-density polyethylene (ULDPE), and uniaxially oriented polyethylene (OPE) and biaxially oriented polyethylene (BOPE) obtained by stretching any of these. From the viewpoint of further improving the sealing property, it is more preferable that the fusion layer 32, which forms the inner surface of the container body 10, is HDPE or LLDPE.

[0039] A known laminate film includes a printed layer containing ink and an adhesive layer that secures the printed layer to a resin layer. To further improve the bonding strength of the bottom seal portion 20, it is preferable that the bottom sheet 17 does not include the printed layer. This configuration can prevent delamination between the printed layer and the adhesive layer, further improving the strength of the bottom portion 19 of the standing pouch 1.

[0040] The volume of contents that can be accommodated in the standing pouch 1 is not particularly limited, but from the viewpoint of further improving the drop strength, it is preferably 400 mL or more and less than 4000 mL, more preferably 600 mL or more and 3000 mL or less.

[0041] The contents housed in the standing pouch 1 are not particularly limited. The contents may be, for example, a liquid or a powder. If the contents are liquid, examples include liquid hair care products such as shampoo, hair conditioner, and hair rinse; liquid soaps such as body soap and hand soap; liquid detergents for clothes and dishes; fabric softeners and bleaches; liquid cleaners for bathrooms, toilets, and floors; liquid cosmetics; liquid beverages; foods; medicines; and engine oil. Furthermore, the contents may be highly viscous liquids such as creams. If the contents are powders, examples include powdered soap and powdered bleach.

[0042] The standing pouch 1 of this embodiment can be manufactured, for example, by the following method. First, a folded bottom sheet 17 is sandwiched between the lower ends of two side wall sheets 16, 16, and the spout 12 is sandwiched between one corner of the upper ends of the side wall sheets 16, 16. The bottom seal 20, side seals 15, 15, and spout-portion-fixing seal 14c are then formed. Next, the pouch is freestanding with the bottom 19 facing the ground. The contents are filled through the top opening between the two side wall sheets 16, 16, and then the top seal 14t is formed to seal the contents storage space. Each seal 20, 15, 15, 14t can be formed by a joining method such as heat sealing. The pouring portion 12 is a molded product made of the above-mentioned various synthetic resins, and is preferably formed by injection molding.

[0043] The stand-up pouch of the present invention is not limited to the embodiment shown in Figures 1 to 6 described above. Another embodiment of the stand-up pouch of the present invention will be described below. In the following, the other embodiment will be described mainly with respect to components that differ from the embodiment shown in Figures 1 to 6, and similar components will be given the same reference numerals and will not be described again. For components that are not particularly described, the description of the embodiment shown in Figures 1 to 5 will be applied as appropriate.

[0044] In the above-described embodiment, the outer end e1 of the bottom seal line 21 is the outer end of the side curved line 22 in the width direction Y, but the outer end e1 of the bottom seal line 21 and the outer end of the side curved line 22 in the width direction Y do not have to be at the same position. Also, in the above-described embodiment, the bottom seal line 21 is composed only of curved lines, the side curved line 22 and the central curved line 23, but the bottom seal line 21 may have straight lines parallel to the width direction Y together with the side curved line 22 and the central curved line 23. 8 has a side straight portion 26 parallel to the width direction Y on the side seal portion 15 side of the side curved line 22, and the outer end of the side straight portion 26 in the width direction Y forms the outer end e1 of the bottom seal line 21. In other words, in the width direction Y, the side curved line 22 is located between the side straight portion 26 and the central curved line 23. The outer end of the portion of the bottom seal line 21 that is not parallel to the width direction Y forms the outer end of the side curved line 22 in the width direction Y.

[0045] In order to achieve a better balance between the drop strength and storage capacity described above, the overall width W1 of the side straight section 26 (length in the width direction Y, see Figure 8) is preferably 1% to 40% of the half width W2 of the bottom seal line 21 (see Figure 3), and more preferably 5% to 20%.

[0046] The bottom seal line 21 of the standing pouch 1b shown in Fig. 9 has a central straight portion 27 closer to the center in the width direction Y than the central curved line 23. In this bottom seal line 21, the central straight portion 27 is located between two central curved lines 23, 23 located on both sides in the width direction Y with the center line CL in between, and the central straight portion 27 is continuous with each of the two central curved lines 23. The central curved line 23 is parallel to the width direction Y and perpendicular to the center line CL. In this embodiment, the central straight portion 27 is divided into two equal parts in the width direction Y by the center line CL. The side straight portion 26 and the central straight portion 27 can be identified by expressing the bottom seal line 21 as a function and calculating an equation based on the function. In order to further improve drop strength and storage capacity, the half width W3 (length in the width direction Y, see Figure 9) of the central straight section 27 is preferably 1% to 30% of the half width W2 (see Figure 3) of the bottom seal line 21, and more preferably 5% to 15%.

[0047] From the viewpoint of achieving a better balance between drop strength and storage capacity, when the overall width W6 (see FIG. 9) of the bottom seal line 21 is divided into four equal regions, it is preferable that the vertex 23t of the central curved line 23 be located in the outermost region R1 (see FIG. 9) in the width direction Y of the four regions. This configuration makes it easier to ensure the volume of the storage space S defined by the central curved line 23 and further improves drop strength. The configuration in which the vertex 23t of the central curved line 23 is located in the outermost region R1 (see FIG. 9) in the width direction Y of the four regions can also be suitably applied to configurations in which the bottom seal line 21 does not have a central straight portion 27 (for example, the configuration shown in FIG. 3). From the same viewpoint as above, it is preferable that the bottom seal line 21 has the following configuration. The distance D2 (see Figure 9) between the outer side edge of the side seal portion 15 in the width direction Y and the vertex 23t of the central curved line 23 is preferably 25% or more and 55% or less, more preferably 40% or more and 50% or less, of the half width W5 (see Figure 9) of the standing pouch 1.

[0048] The present invention is not limited to the above-described embodiments and can be modified as appropriate. The above-described embodiments may also be combined. For example, the container body 10 may have a top crotch portion connecting the pair of side walls 11, 11 in addition to the bottom crotch portion 13 connecting the pair of side walls 11, 11. In this case, the top crotch portion connects the upper ends of the pair of side walls 11, 11, and the pouring portion 12 can be provided on the top crotch portion instead of the corner portion. The bottom seal line 21 may also have a side straight portion 26 and a central straight portion 27 in addition to the side curved line 22 and the central curved line 23 . The bottom seal line 21 may also be formed by connecting the side curved line 22 and the central curved line 23 with a straight line portion. [Explanation of symbols]

[0049] 1,1a,1b Standing Pouch 10 Container body 11 Side wall 12 Pour part 13 Bottom gossamer part 14c Outlet fixed seal 14t Upper seal part 15 Side seal part 16 Sidewall Sheet 17 Bottom sheet 17t fold 19 Bottom 20 Bottom seal 20f Front bottom seal 20r Rear bottom seal 21 Bottom seal line 22 Side curved line 22t Side curve apex 23 Central curved curve 23t Central curved line apex 26 Side straight section 27 Central straight section 31 Resin layer 32 Fusion layer X height direction Y width direction Z depth direction

Claims

1. A standing pouch having a container body with a storage space for contents therein, the container body has a pair of opposing side walls and a bottom crotch portion connecting the side walls at a lower end of the container body, and has a width direction that is a left-right direction relative to the side walls and a depth direction that is perpendicular to the width direction, the pair of side walls are each formed by a side wall sheet, and the bottom gusset portion is formed by a bottom sheet; The container body has a side seal portion where the side portions of the two side wall sheets are directly joined together, and a bottom seal portion where each of the side wall sheets is joined to the bottom sheet interposed between the side wall sheets in a folded state, The bottom seal line forming the upper edge of the bottom seal portion has, on each side of a center line that divides the bottom seal line into two equal parts in the width direction, a side curved line that is located on the side seal portion side in the width direction and curves in a convex shape obliquely upward, and a center curved line that is located below the side curved line and on the center side in the width direction and curves in a convex shape obliquely downward, the side curved line is adjacent to the side seal portion in the width direction, a tangent to the apex of the side curved line is inclined with respect to the width direction, a tangent to the side curved line at an outer end in the width direction is inclined with respect to the width direction, A standing pouch, wherein half the width of the standing pouch, which is the length in the width direction between the outer end of the bottom seal portion and the center line, is 2.00 times or more the height of the bottom sheet in the folded state.

2. 2. The standing pouch according to claim 1, wherein an apex of the central curved line is located more inward in the width direction than an apex of each of the side curved lines.

3. 3. The standing pouch according to claim 1, wherein a tangent to a vertex of the side curved line has an inclination angle of 10° or more and 80° or less with respect to the width direction.

4. 3. The standing pouch according to claim 1, wherein a tangent to the vertex of the central curved line has an inclination angle of 20° or more and 60° or less with respect to the width direction.

5. 3. The standing pouch according to claim 1, wherein when the position of the upper end of the overlapping portion of the bottom seal portion and the side seal portion is defined as an intersection position and the intersection point of the lower edge of the bottom seal portion and the center line is defined as a lower end center point, an inclination angle of a tangent at the outer end of the side curved line in the width direction with respect to the width direction is 1 to 1.4 times the inclination angle of a reference line connecting the outer end of the width direction of the intersection position with the lower end center point with respect to the width direction.

6. 3. The standing pouch according to claim 1, wherein the bottom seal line has a central straight portion parallel to the width direction, the central straight portion being closer to the center in the width direction than the central curved line.

7. The side wall sheets and the bottom sheet are each formed of a laminated film in which a fusion layer forming the bottom seal portion and a resin layer are laminated together, 3. The stand-up pouch according to claim 1, wherein the bottom sheet does not have a printed layer containing ink.

8. A standing pouch having a container body with a storage space for contents therein, the container body has a pair of opposing side walls and a bottom crotch portion connecting the side walls at a lower end of the container body, and has a width direction that is a left-right direction relative to the side walls and a depth direction that is perpendicular to the width direction, the pair of side walls are each formed by a side wall sheet, and the bottom gusset portion is formed by a bottom sheet; The container body has a side seal portion where the side portions of the two side wall sheets are directly joined together, and a bottom seal portion where each of the side wall sheets is joined to the bottom sheet interposed between the side wall sheets in a folded state, The bottom seal line forming the upper edge of the bottom seal portion has, on each side of a center line that bisects the bottom seal line in the width direction, a side curved line that is located on the side seal portion side in the width direction and curves in a convex shape obliquely upward, and a center curved line that is located below the side curved line and toward the center in the width direction and curves in a convex shape obliquely downward, and further has a side straight line that is parallel to the width direction and closer to the side seal portion than the side curved line, a tangent to the apex of the side curved line is inclined with respect to the width direction, a tangent to the side curved line at an outer end in the width direction is inclined with respect to the width direction, A standing pouch, wherein half the width of the standing pouch, which is the length in the width direction between the outer end of the bottom seal portion and the center line, is 2.00 times or more the height of the bottom sheet in the folded state.

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