Paper pouch and manufacturing method of paper pouch

Abstract

To prevent an unintended area from being heat sealed.SOLUTION: A paper pouch according to one embodiment is a refillable paper pouch. This paper pouch has a pair of body parts facing each other and a bottom part folded between the pair of body parts, each of the pair of body parts is formed of a laminated sheet in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a paper base layer are laminated in this order, the pair of body parts have a heat seal part where the sealant layers of the pair of body parts are fused to each other, the heat seal part is formed along the outer edges of the pair of body parts, and a storage space for storing a content and a pouring path extending from the storage space are formed between the pair of body parts, a thickness of the paper base layer is greater than the thickness of the sealant layer, and a base weight of the paper base layer is 50 g / m2 or more and 110 g / m2 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a paper pouch and a method for making the paper pouch. [Background technology]

[0002] Conventionally, a refillable standing pouch has been used in which a pair of body parts and a bottom part folded between the pair of body parts are heat-sealed. Generally, a standing pouch has a pouring passage for pouring out the contents, and the pouring passage is cut to form a pouring outlet, from which the contents are poured out.

[0003] For example, Patent Document 1 describes a standing pouch having an upper heat seal pattern with a convex non-sealed portion at the upper part of the pouch, a notch for cutting across the non-sealed portion to form an opening, and locking portions provided on both the left and right sides of the opening for fixing the opening in a folded state.

[0004] Patent document 2 describes a squeezing pouch having a front side and a back side, with a paper layer laminated on the back side, and a crease formed approximately in the center of the width of the back side for folding the pouch in two. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-175646 [Patent Document 2] JP 2007-030944 A Summary of the Invention [Problem to be solved by the invention]

[0006] Generally, in this type of standing pouch, the sealant layers of a pair of body parts are fused by heating the pair of body parts while the sealant layers are facing each other and sandwiched from the outer layer side by a seal bar. In this case, if the pair of body parts includes a barrier layer having a high thermal conductivity, the heat of the seal bar is transferred to the surroundings through the barrier layer, and the sealant layer may be fused even in the area not sandwiched by the seal bar. In other words, a seal pattern may be formed in an unintended area. Therefore, if the pair of body parts includes a barrier layer, it is not easy to form a pouch having a seal pattern with a complex shape.

[0007] Therefore, an object of the present disclosure is to provide a paper pouch that can prevent unintended areas from being heat-sealed, and a method for manufacturing a paper pouch. [Means for solving the problem]

[0008] A paper pouch according to one embodiment is a refillable paper pouch having a pair of body parts facing each other and a bottom part folded between the pair of body parts, each of the pair of body parts being formed of a laminated sheet in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a paper base layer are laminated in this order, the pair of body parts have heat-sealed parts in which the sealant layers of the pair of body parts are fused to each other, the heat-sealed parts are formed along the outer edges of the pair of body parts, and a storage space for storing contents and a pouring path extending from the storage space are formed between the pair of body parts, the thickness of the paper base layer is thicker than the thickness of the sealant layer, and the basis weight of the paper base layer is 50 g / m 2 More than 110g / m 2 The following is the result.

[0009] A pair of body parts of a paper pouch according to one embodiment has a paper base layer provided on the outer layer side of a barrier layer having high thermal conductivity. Therefore, when the pair of body parts are heated while being sandwiched between sealing bars, the heat from the sealing bars is blocked by the paper base layer and is less likely to be transmitted to the barrier layer. As a result, the heat seal portion is prevented from spreading to areas not sandwiched between the sealing bars. Here, the amount of heat transmitted from the toolbar to the barrier layer depends on the thickness and basis weight of the paper base layer. The thickness of the paper base layer is made thicker than the thickness of the sealant layer, and the basis weight of the paper base layer is made 50 g / m2. 2 More than 110g / m 2 By setting the thickness of the sealant layer at 100° C., it is possible to fuse the sealant layer while suppressing the transfer of heat to the barrier layer. Therefore, the paper pouch according to this embodiment can suppress the formation of a seal pattern in an unintended area.

[0010] In one embodiment, the thickness of the paper base layer may be 60 μm or more and 150 μm or less. By making the thickness of the paper base layer 60 μm or more and 150 μm or less, the sealant layer can be fused while suppressing heat transfer to the barrier layer.

[0011] In one embodiment, the width of the pouring path along the planned cutting line that crosses the pouring path may be 8 mm or less. In order to form a narrow pouring path, it is required to form a heat-sealed portion with high dimensional accuracy. In contrast, according to the paper pouch of this embodiment, heat sealing of unintended areas is suppressed, so that the heat-sealed portion can be formed with high dimensional accuracy. As a result, a narrow pouring path can be formed.

[0012] In one embodiment, the distance from the planned cutting line to the tip of the pouring path in the extension direction of the pouring path may be 8 mm or less. As described above, in order to form a pouring path with a small distance from the planned cutting line to the tip of the pouring path, it is required to form a heat-sealed part with high dimensional accuracy. In contrast, according to the paper pouch of this embodiment, heat sealing of unintended areas is suppressed, so that the heat-sealed part can be formed with high dimensional accuracy. As a result, a pouring path with a small distance from the planned cutting line to the tip of the pouring path can be formed.

[0013] In one embodiment, the width of the pouring path along the imaginary line extending parallel to the cutting line between the cutting line and the tip of the pouring path may be larger than the width of the pouring path along the cutting line. If the diameter of the pouring outlet is small, the contents may not be poured smoothly from the pouring outlet depending on the viscosity of the contents. In this embodiment, the width of the pouring path along the imaginary line is wider than the width of the pouring path along the cutting line, so that even if the pouring path is cut at the tip side of the cutting line, the diameter of the pouring outlet is prevented from becoming smaller. Therefore, even if the pouring path is cut at a position shifted from the cutting line, the contents can be poured smoothly.

[0014] In one embodiment, the barrier layer may be a metal layer containing aluminum. The metal layer containing aluminum has high thermal conductivity and is therefore prone to heat sealing in unintended areas. In contrast, in the paper pouch according to this embodiment, a paper base layer is provided on the outside of the barrier layer, which makes it possible to prevent heat sealing from occurring in unintended areas.

[0015] In one embodiment, the capacity may be 100 ml or less. When the size of the pouch is small, it is required to form a seal pattern with a complex shape. In contrast, in the paper pouch according to the present embodiment, a paper base layer is provided on the outside of the barrier layer, so that a seal pattern with a complex shape can be formed. Effect of the Invention

[0016] According to the present disclosure, it is possible to prevent unintended areas from being heat sealed. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a front view showing a paper pouch according to one embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] 1 is an enlarged front view showing the periphery of the extraction section of the paper pouch. FIG. [Figure 4] 1 is a flowchart showing a method for manufacturing a paper pouch according to one embodiment. [Diagram 5] FIG. 2 is a front view showing a paper pouch containing contents. [Figure 6] FIG. 4 is a diagram showing a planar shape of a seal bar. [Figure 7] FIG. 13 is a diagram showing a heat-sealed portion formed in a comparative example. [Figure 8] FIG. 2 is a diagram showing a heat-sealed portion formed in an example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions are omitted. The drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional ratios, angles, etc. are not limited to those shown in the drawings.

[0019] FIG. 1 is a front view showing a paper pouch according to one embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. The paper pouch 1 shown in FIG. 1 and FIG. 2 is a standing pouch capable of displaying a paper mark based on the Law Concerning Promotion of Effective Utilization of Resources. The paper pouch 1 contains refillable contents. In the following description, the up-down direction of the paper pouch 1 is referred to as the vertical direction D1, and the direction perpendicular to the vertical direction D1 is referred to as the horizontal direction D2. The up-down direction is based on the direction of the paper pouch 1 in a self-supporting state.

[0020] As shown in Figs. 1 and 2, the paper pouch 1 has a pair of body portions 2 facing each other and a bottom portion 3 folded between the pair of body portions 2. The paper pouch 1 has a storage space 12 for storing contents. The storage space 12 is defined by the pair of body portions 2 and the bottom portion 3. The pair of body portions 2 include a body portion 2A and a body portion 2B. Since the body portion 2A and the body portion 2B have substantially the same structure, in the following description, the body portion 2A and the body portion 2B will be collectively referred to as the body portion 2 unless a particular distinction is required.

[0021] In one embodiment, the paper pouch 1 is a small packaging bag, for example, with a capacity of 100 ml or less. The contents accommodated in the paper pouch 1 are typically liquids. Examples of the contents include daily necessities such as liquid detergent, cleaning agent, medicine, cosmetics, shampoo, and conditioner, foods such as liquid seasoning, soup, yogurt, soft drinks, and cooking oil, and industrial products such as lubricating oil and industrial oil.

[0022] Each of the pair of body parts 2 is composed of a first laminate sheet 7 in which a sealant layer 4, a barrier layer 5 having a higher thermal conductivity than the sealant layer 4, and a paper base layer 6 are laminated in this order from the inner layer side. The sealant layer 4 is a layer that is thermally fused by heat sealing. The sealant layer 4 is composed of a resin film made of, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), extruded low density polyethylene (EXPE), or the like, or a laminate of these resin films.

[0023] The barrier layer 5 blocks gas and liquid and provides airtightness to the paper pouch 1. In one embodiment, the barrier layer 5 is a metal layer containing aluminum. For example, the barrier layer 5 may be an aluminum foil or an aluminum vapor deposition film (e.g., VM-PET). The barrier layer 5 has a higher thermal conductivity than the sealant layer 4.

[0024] The paper base layer 6 is a layer made of a paper sheet. The paper base layer 6 is made of, for example, bleached kraft paper. The paper base layer 6 has a lower thermal conductivity than the barrier layer 5. The thickness of the paper base layer 6 is thicker than the thickness of the sealant layer 4. In one embodiment, the thickness of the paper base layer 6 may be 60 μm or more and 150 μm or less. By making the thickness of the paper base layer 6 60 μm or more and 150 μm or less, the sealant layer 4 can be fused while suppressing heat transfer to the barrier layer 5 during heat sealing. In addition, in order to block heat to the barrier layer 5, the thickness of the paper base layer 6 may be 70 μm or more, 80 μm or more, or 90 μm or more. In addition, in order to prevent the rigidity of the pair of body parts 2 from becoming excessively high, the thickness of the paper base layer 6 may be 140 μm or less, 130 μm or less, or 120 μm or less.

[0025] The basis weight of the paper base layer 6 is 50 g / m 2 More than 110g / m 2 In order to increase the weight ratio of the paper, the basis weight of the paper base layer 6 is set to 60 g / m 2 On the other hand, in order to prevent the shape retention of the body 2 from becoming excessively high, the basis weight of the paper base layer 6 is set to 80 g / m 2 It may be 90 mm or less or 90 mm or less. Shape retention is the property of maintaining a shape, and is also called shape retention.

[0026] The weight ratio of the paper base layer 6 to the total weight of the paper pouch 1 is greater than 50%. That is, in order to enable a paper mark to be displayed on the paper pouch 1, the weight ratio of paper to the total weight of the paper pouch 1 is greater than 50%.

[0027] The sealant layer 4, the barrier layer 5, and the paper base layer 6 are bonded to each other. For example, the sealant layer 4, the barrier layer 5, and the paper base layer 6 are bonded to each other by an organic solvent-based ester adhesive or a solventless ester adhesive. In one embodiment, the first laminate sheet 7 may include an intermediate layer between the barrier layer 5 and the paper base layer 6. The intermediate layer is, for example, a resin film made of polyethylene terephthalate (PET) or extruded low-density polyethylene (EXPE), or a layer made of a laminate of these resin films.

[0028] The bottom part 3 is composed of a second laminate sheet 11 in which a sealant layer 8, a barrier layer 9 having a higher thermal conductivity than the sealant layer 8, and a base layer 10 are laminated in this order. The sealant layer 8 is a layer that is thermally fused by heat sealing. The sealant layer 8 is composed of a resin film made of, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), extruded low density polyethylene (EXPE), or the like, or a laminate of these resin films.

[0029] The barrier layer 9 blocks gas and liquid, and provides airtightness to the paper pouch 1. In one embodiment, the barrier layer 9 is a metal layer containing aluminum. For example, the barrier layer 9 may be an aluminum foil or an aluminum vapor deposition film (e.g., VM-PET). The barrier layer 9 has a higher thermal conductivity than the sealant layer 8. The base layer 10 is, for example, a resin film layer. The base layer 10 is, for example, a resin film made of nylon (Ny), polypropylene (PP), high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), extruded low density polyethylene (EXPE), or the like, or a laminate of these resin films. The base layer 10 may be a paper base layer made of a paper sheet.

[0030] The sealant layer 8, the barrier layer 9, and the base layer 10 are bonded to one another. For example, the sealant layer 8, the barrier layer 9, and the base layer 10 are bonded to one another by an organic solvent-based ester adhesive or a solventless ester adhesive.

[0031] Each of the pair of body parts 2 has a substantially rectangular shape. The pair of body parts 2 are arranged so that the sealant layers 4 face each other. The bottom part 3 has a substantially rectangular shape. As shown in FIG. 2, the bottom part 3 is folded between the pair of body parts 2 so that the sealant layer 8 faces the sealant layers 4 of the pair of body parts 2. As shown in FIG. 2, the bottom part 3 includes a first bottom part 3a arranged on the body part 2A side and a second bottom part 3b arranged on the body part 2B side, and the first bottom part 3a is folded over the second bottom part 3b.

[0032] As shown in FIG. 1, the pair of body parts 2 have a heat-sealed portion 20 in which the sealant layers 4 of the pair of body parts 2 are fused to each other. The heat-sealed portion 20 is formed along the outer edge of the pair of body parts 2. By joining the outer edges of the pair of body parts 2 by the heat-sealed portion 20, a storage space 12, an injection port 13 for injecting the contents into the storage space 12, and an outlet path 14 for outletting the contents in the storage space 12 are formed between the pair of body parts 2. The outlet path 14 extends from the storage space 12. The outlet path 14 extends in an extension direction D3 that is inclined, for example, to the vertical direction D1 and the horizontal direction D2. The storage space 12, the injection port 13, and the outlet path 14 are portions in which the sealant layers 4 of the pair of body parts 2 are not fused to each other.

[0033] The body 2 has a main body 15 that defines the storage space 12, and a pouring portion 16 that protrudes from the main body 15 and defines the pouring passage 14. The body 2 also has an upper edge 15a, a bottom edge 15b, a first side edge 15c, and a second side edge 15d. The upper edge 15a, the bottom edge 15b, the first side edge 15c, and the second side edge 15d form the outer edge of the body 2. The upper edge 15a and the bottom edge 15b form the upper end and the lower end of the body 2, respectively, and extend in the horizontal direction D2. The first side edge 15c and the second side edge 15d form a pair of side ends of the body 2, and extend in the vertical direction D1 from both ends of the bottom edge 15b.

[0034] 3 is an enlarged view of the periphery of the pouring portion 16 of the paper pouch 1. As shown in FIGS. 1 and 3, the pouring portion 16 is formed in a corner portion 15e located between the upper edge portion 15a and the first side edge portion 15c of the body portion 2. The pouring portion 16 is formed, for example, by cutting out a part of the upper edge portion 15a and the first side edge portion 15c at the corner portion 15e. In other words, the pouring portion 16 is formed by forming a first notch 18 in a part of the upper edge portion 15a on the first side edge portion 15c side and forming a second notch 19 in a part of the first side edge portion 15c on the upper edge portion 15a side.

[0035] 1, the heat seal portion 20 includes a first side seal portion 21, a second side seal portion 22, a pour-out seal portion 23, and a bottom seal portion 24. The first side seal portion 21 is a portion where the sealant layers 4 of a pair of body portions 2 are fused to each other, and extends in the vertical direction D1 along the first side edge portion 15c. The second side seal portion 22 is a portion where the sealant layers 4 of a pair of body portions 2 are fused to each other, and extends in the vertical direction D1 along the second side edge portion 15d.

[0036] The pouring seal portion 23 is a portion where the sealant layers 4 of the pair of body portions 2 are fused to each other, and is connected to the upper end of the first side seal portion 21. The pouring seal portion 23 is formed along the outer edge of the pouring portion 16 so as to surround the pouring path 14. The pouring path 14 is surrounded by the pouring seal portion 23, and is a portion where the sealant layers 4 of the pair of body portions 2 are not fused to each other. In other words, the pouring path 14 is defined by the pouring seal portion 23.

[0037] The bottom seal portion 24 is a portion where the sealant layer 4 of the pair of body portions 2 and the sealant layer 8 of the bottom portion 3 are fused to each other. That is, the bottom seal portion 24 includes a portion where the body portion 2A and the bottom portion 3 are fused to each other, and a portion where the body portion 2A and the bottom portion 3 are fused to each other. The bottom seal portion 24 connects the lower end of the first side seal portion 21 and the lower end of the second side seal portion 22.

[0038] Upper edge portion 15a has a portion that is not heat sealed between pouring seal portion 23 and second side seal portion 22. This portion that is not heat sealed constitutes injection port 13. Note that, as long as injection port 13 is formed in part of upper edge portion 15a, the pair of body portions 2 may be fused to each other in part of upper edge portion 15a.

[0039] In order to stably support the paper pouch 1 when the contents are placed inside, both ends of the first bottom portion 3a and the second bottom portion 3b in the horizontal direction D2 are cut into a crescent shape, and the body portion 2A and the body portion 2B are partially heat-sealed together. The portion where the first bottom portion 3a and the second bottom portion 3b are cut into a crescent shape and the body portion 2A and the body portion 2B are partially heat-sealed together is called a point seal portion 25.

[0040] Next, the pouring portion 16 of the paper pouch 1 will be described in more detail with reference to Fig. 3. The pouring path 14 formed in the pouring portion 16 has a base end 31 and a tip end 32, and extends in an extension direction D3 between the base end 31 and the tip end 32. The extension direction D3 is inclined in the vertical direction D1 and the horizontal direction D2. The pouring path 14 communicates with the storage space 12 via the base end 31. The pouring path 14 is closed at the tip end 32.

[0041] The spout portion 16 has a planned cutting line L1. The planned cutting line L1 is a virtual line along which the spout portion 16 is to be cut by scissors or the like, and may be, for example, a dashed line printed on the spout portion 16, or a line made embrittled by fine embossing or the like. A notch serving as a starting point for cutting may be formed at the end of the planned cutting line L1. The planned cutting line L1 extends in a direction intersecting (perpendicular to) the extension direction D3 of the spouting path 14, and crosses the spouting path 14. Typically, the planned cutting line L1 is formed at a position where the width of the spout portion 16 is minimum in a direction perpendicular to the extension direction D3. By cutting the spout portion 16 along the planned cutting line L1, a spout outlet is opened, and the contents in the storage space 12 are poured out from the spout outlet.

[0042] In one embodiment, the width W1 of the pouring path 14 along the planned cutting line L1 is 8 mm or less. The sum of the widths W2 of the pouring seal portion 23 along the planned cutting line L1 may be 4 mm or less. That is, the width W3 of the pouring portion 16 along the planned cutting line L1 is, for example, 12 mm or less. In addition, the distance d from the planned cutting line L to the tip portion 32 of the pouring path 14 in the extension direction D3 of the pouring path 14 may be 8 mm or less. Since the width of the pouring path formed in a refill pouch is generally 10 mm or more, the pouring path 14 having a width W1 of 8 mm or less is narrow. In order to form such a narrow pouring path 14, it is required to reduce the width W2 of the pouring seal portion 23. In addition, unless otherwise specified, in the following description, the "width of the pouring path 14" means the width of the pouring path 14 in a direction parallel to the planned cutting line L1.

[0043] The width of the pouring path 14 is gradually narrowed from the base end 31 toward the planned cutting line L1. On the other hand, when a virtual line located between the planned cutting line L1 and the tip end 32 of the pouring path 14 and parallel to the planned cutting line is a line L2, the width of the pouring path 14 is gradually widened from the planned cutting line L1 toward the line L2. That is, the width W4 of the pouring path 14 along the line L2 is larger than the width W1 of the pouring path 14 along the planned cutting line L1. The width of the pouring path 14 is gradually narrowed from the line L2 toward the tip end 32. That is, the pouring path 14 has a portion tapering from the base end 31 toward the planned cutting line L1, a portion widening from the planned cutting line L1 toward the line L2, and a portion tapering from the line L2 toward the tip end 32. By widening the width of the pouring path 14 as it approaches the line L2, even if the user cuts the pouring path 14 closer to the tip 32 than the planned cutting line L1, the diameter of the pouring outlet can be secured, so that the contents can be poured out smoothly from the paper pouch 1.

[0044] Next, a method for manufacturing a paper pouch according to an embodiment will be described below. Fig. 4 is a flow chart showing the method for manufacturing a paper pouch 1 according to an embodiment.

[0045] 4, in order to manufacture the paper pouch 1, a pair of first laminate sheets 7 constituting a pair of body portions 2 and a second laminate sheet 11 constituting the bottom portion 3 are first prepared (step ST1). As described above, the first laminate sheet 7 is composed of a sealant layer 4, a barrier layer 5, and a paper base material layer 6 laminated in this order, and the second laminate sheet 11 is composed of a sealant layer 8, a barrier layer 9, and a base material layer 10 laminated in this order. Decorations or the like may be printed on the outer layers of the first laminate sheet 7 and the second laminate sheet 11.

[0046] Next, the pair of first laminate sheets 7 are overlapped so that the sealant layers 4 face each other, and the second laminate sheet 11 is placed between the pair of first laminate sheets 7 so that the sealant layer 8 faces the sealant layer 4 of the pair of first laminate sheets 7. Next, the bottom seal portion 24 is formed (step ST2). The bottom seal portion 24 is formed, for example, by heating the pair of first laminate sheets 7 from the outer layer side (paper base layer 6 side) while sandwiching them with a seal bar in a state where the sealant layer 4 of the pair of first laminate sheets 7 and the sealant layer 8 of the second laminate sheet 11 face each other, and heat-sealing the second laminate sheet 11 to the pair of first laminate sheets 7. That is, the part where the sealant layer 4 of the pair of first laminate sheets 7 and the sealant layer 8 of the second laminate sheet 11 are fused becomes the bottom seal portion 24. In this way, the bottom seal portion 24 is formed, and the bottom 3 of the paper pouch 1 is formed.

[0047] Next, the heat-sealed first laminate sheet 7 and second laminate sheet 11 are cooled (step ST3). By cooling the first laminate sheet 7 and the second laminate sheet 11, the bottom seal portion 24 is fixed.

[0048] Next, the point seal portion 25 is formed (step ST4). The point seal portion 25 is formed by heat-sealing the pair of first laminate sheets 7 to each other. Next, the first side seal portion 21, the second side seal portion 22, and the pouring seal portion 23 are formed (step ST5). The first side seal portion 21, the second side seal portion 22, and the pouring seal portion 23 are formed by heating the pair of first laminate sheets 7 from the outer layer side (paper base layer 6 side) while sandwiching them with a seal bar in a state where the sealant layers 4 of the pair of first laminate sheets 7 face each other, and heat-sealing the outer edges of the pair of first laminate sheets. That is, the parts where the sealant layers 4 of the pair of first laminate sheets 7 are fused to each other become the first side seal portion 21, the second side seal portion 22, and the pouring seal portion 23. As described above, the heat seal portion 20 is formed, and thus a pair of body portions 2 having the storage space 12, the injection port 13, and the pouring path 14 are formed. At this time, the width of the formed pouring path 14 along the planned cutting line L1 is 8 mm or less.

[0049] As described above, the heat-sealed portion 20 is formed by applying heat to the pair of first laminate sheets 7 from the outer layer side. In the pair of first laminate sheets 7, the paper base layer 6 having a relatively low thermal conductivity is provided on the outer layer side of the barrier layer 5, so that the heat from the seal bar is blocked by the paper base layer 6 having a relatively low thermal conductivity, and is less likely to be transmitted to the barrier layer 5. Therefore, the heat-sealed portion 20 is prevented from spreading to the area not sandwiched by the seal bars. As a result, it is possible to improve the dimensional accuracy of the heat-sealed portion 20, and a narrow pouring path 14 can be formed.

[0050] Next, the pair of heat-sealed first laminate sheets 7 are cooled (step ST6). By cooling the pair of first laminate sheets 7, the first side seal portion 21, the second side seal portion 22, and the pour-out seal portion 23 are fixed.

[0051] Next, the pair of first laminate sheets 7 with the heat-sealed portions 20 formed therein are punched out along the outer shape of the paper pouch 1 with a blade such as a Thompson blade (step ST7). As a result, the paper pouch 1 is manufactured.

[0052] Next, the contents C are injected into the paper pouch 1 (step ST8). The contents C are injected into the storage space 12, for example, through the injection port 13. After the contents C are injected, the upper seal portion 26 is formed (step ST9). FIG. 5 shows the paper pouch 1 after the contents C are injected and the upper seal portion 26 is formed. As shown in FIG. 5, the upper seal portion 26 is a portion where the sealant layers 4 of a pair of body portions 2 are fused to each other, and extends in the horizontal direction D2 along the upper edge portion 15a. By forming the upper seal portion 26, the injection port 13 is sealed, and the paper pouch 1 containing the contents C is manufactured.

[0053] In the paper pouch 1 manufactured as described above, the contents C contained in the storage space 12 spread out the pair of body portions 2 and bottom portion 3, causing the bottom edge portions 15b of the pair of body portions 2 to spread out in an arc shape, making the pouch self-supporting.

[0054] When transferring the contents C in the paper pouch 1 to an empty bottle, first cut the pouring path 14 along the planned cutting line L1 with scissors or the like to form a pouring outlet. Next, lift and tilt the paper pouch 1. This moves the contents C to the pouring path 14, and the weight of the contents C opens the pouring outlet, and the contents C are poured out from the pouring outlet into a container. When the entire amount of the contents C in the paper pouch 1 has been transferred to the bottle, the refilling of the contents C is completed.

[0055] As explained above, the pair of body parts 2 of the paper pouch 1 according to the embodiment has the paper base layer 6 provided on the outside of the barrier layer 5, which has high thermal conductivity. Therefore, when the pair of body parts 2 are heated while being sandwiched between the seal bars, the paper base layer 6 blocks heat from the seal bars, making it difficult for heat to be transmitted to the barrier layer 5. This prevents areas not sandwiched between the seal bars from being unintentionally sealed. The thermal conductivity to the barrier layer 5 depends on the thickness and basis weight of the paper base layer 6. In the paper pouch 1, the thickness of the paper base layer 6 is made thicker than the thickness of the sealant layer 4, and the basis weight of the paper base layer 6 is 50 g / m 2 More than 110g / m 2 By doing so, it is possible to fuse the sealant layer 4 while suppressing the transfer of heat to the barrier layer 5. With such a paper pouch 1, a seal pattern of a complex shape can be formed. Therefore, it is possible to form a paper pouch 1 having a narrow pouring passage 14. By reducing the width W1 of the pouring passage 14, it is possible to smoothly refill the contents C into a bottle with a small diameter.

[0056] The above describes the paper pouch 1 and the method for manufacturing the paper pouch according to various embodiments, but the present invention is not limited to the above-described embodiments and various modifications can be made without departing from the spirit of the invention.

[0057] For example, in the above embodiment, the base material layer 10 of the bottom portion 3 is composed of a resin film, but the base material layer 10 may be a paper base material layer. The first laminate sheet 7 constituting the pair of body portions 2 may further have a layer other than the sealant layer 4, the barrier layer 5, and the paper base material layer 6. Similarly, the second laminate sheet 11 constituting the bottom portion 3 may further have a layer other than the sealant layer 8, the barrier layer 9, and the base material layer 10.

[0058] In the above embodiment, the spouting portion 16 is described as being located at the corner portion 15e of the pair of body portions 2, but the position of the spouting portion 16 is not particularly limited. However, from the viewpoint of preventing the contents from spilling when the spouting portion 16 is cut, it is preferable that the spouting portion 16 is formed at the upper portion of the paper pouch 1.

[0059] In the above embodiment, the first notch 18 and the second notch 19 are formed in the upper edge 15a and the first side edge 15c to form the pouring portion 16, but such first notch 18 and second notch 19 do not have to be formed. Regardless of the shape of the pouring portion 16, the pouring seal portion 23 can form the pouring path 14 of any shape. The various embodiments described above can be combined within a range that does not cause any contradiction.

[0060] Next, the effects of the above-mentioned paper pouch 1 will be described based on examples and comparative examples, but the present invention is not limited to the following examples.

[0061] (Comparative Example) First, in the comparative example, a pair of laminated films in which a sealant layer, a barrier layer, and a resin layer were laminated were prepared. The sealant layer was a laminated film in which a 30 μm-thick low-density polyethylene (LDPE) film and a 13 μm-thick extrusion-molded low-density polyethylene (EXPE) film were laminated in this order from the inner layer side. The barrier layer was an aluminum-deposited barrier film with a thickness of 9 μm. The resin layer was a laminated film in which a 13 μm-thick extrusion-molded low-density polyethylene (EXPE) film and a 12 μm-thick polyethylene terephthalate (PET) film were laminated. The sealant layer, barrier layer, and resin layer were bonded together with an organic solvent-based ester adhesive (LX500, manufactured by DIC Graphics Corporation) to prepare a pair of laminated sheets.

[0062] Next, the pair of laminated sheets was sandwiched between the sealant bars 110 from the outer layer side with the sealant layers of the prepared pair of laminated sheets facing each other, and the seal bars 110 were heated to 200°C to form the heat-sealed portion 120 and the pouring path 114. The heating time was 2 minutes. The shape of the seal bar 110 used in the comparative example was as shown in FIG. 6. As shown in FIG. 6, the width of the pouring path 114 was 3 mm at the narrowest part (tip). Then, the heat-sealed portion 120 formed on the pair of laminated sheets was observed using an optical microscope.

[0063] (Example) On the other hand, in the examples, a pair of laminated films was prepared in which a sealant layer, a barrier layer, a resin layer, and a paper base layer were laminated. The sealant layer, the barrier layer, and the base layer were made of the same material and had the same thickness as the sealant layer, the barrier layer, and the resin layer in the comparative example. That is, the examples differ from the comparative example in that the paper base layer was provided on the outside of the resin layer. Bleached kraft paper with a basis weight of 80 g (thickness of 101 μm) was used as the paper base layer. A pair of laminated sheets was prepared by bonding the sealant layer, barrier layer, resin layer, and paper base layer with an organic solvent-based ester-based adhesive (LX500, manufactured by DIC Graphics Corporation).

[0064] Next, the pair of laminated sheets was sandwiched between the sealant bars 110 from the outer layer side with the sealant layers of the prepared pair of laminated sheets facing each other, and the seal bars 110 were heated to 200°C to form the heat-sealed portion 120 and the pouring path 114. The heating time was 2 minutes. The shape of the seal bar 110 used in the example was the same as that of the seal bar 110 used in the comparative example. Then, the heat-sealed portion 120 formed on the pair of laminated sheets was observed using an optical microscope.

[0065] Fig. 7 shows the heat-sealed portion 120 formed in the comparative example, and Fig. 8 shows the heat-sealed portion 120 formed in the example. As shown in Fig. 7, when a pair of laminated sheets was heat-sealed in the comparative example, the heat-sealed portion 120 spread to the area where the seal bar 110 was not pressed, and as a result, it was confirmed that a part of the injection path 114 was fused. In particular, at the narrow tip of the injection path 114, the pair of laminated sheets was completely fused. This result is considered to be due to heat being transferred to the sealant layer through the barrier layer, and the sealant layer being fused in the area around the seal bar 110.

[0066] In contrast, as shown in Fig. 8, in Example 1, in the area where the sealing bar 110 is not pressed, the heat-sealed portion 120 is not formed, and it was confirmed that a narrow pouring path 114 can be formed. From these results, it was confirmed that by arranging the paper base layer on the outer side of the barrier layer, a heat-sealed portion with a precise shape can be formed.

[0067] The present disclosure includes the following: [1] A refill paper pouch, A pair of opposing body parts and a bottom part folded between the pair of body parts, Each of the pair of body portions is formed of a laminated sheet in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a paper base layer are laminated in this order; the pair of body portions have heat-sealed portions in which the sealant layers of the pair of body portions are fused to each other, The heat seal portion is formed along the outer edges of the pair of body portions, and a storage space for storing contents and a pouring path extending from the storage space are formed between the pair of body portions, The thickness of the paper base layer is greater than the thickness of the sealant layer, The paper base layer has a basis weight of 50 g / m 2 More than 110g / m 2 Below is the Paper pouch. [2] The paper pouch described in [1], wherein the thickness of the paper base layer is 60 μm or more and 150 μm or less. [3] A paper pouch according to [1] or [2], wherein the width of the pouring path along the planned cutting line that crosses the pouring path is 8 mm or less. [4] The paper pouch described in [3], wherein the distance from the planned cutting line to the tip of the pouring path in the extension direction of the pouring path is 8 mm or less. [5] A paper pouch as described in [3] or [4], wherein a width of the pouring path along a virtual line extending parallel to the planned cutting line between the planned cutting line and the tip of the pouring path is greater than a width of the pouring path along the planned cutting line. [6] The paper pouch described in any one of [1] to [5], wherein the barrier layer is a metal layer containing aluminum. [7] The paper pouch described in any one of [1] to [6], having a volume of 100 ml or less. [8] A method for manufacturing a paper pouch having a pair of opposing body sections and a bottom section folded between the pair of body sections, comprising the steps of: preparing a pair of first laminate sheets in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a paper base layer are laminated in this order, and a second laminate sheet in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a base layer are laminated in this order; forming the bottom portion by heat-sealing the second laminate sheet to the pair of first laminate sheets in a state in which the sealant layer of the pair of first laminate sheets and the sealant layer of the second laminate sheet face each other; heat-sealing the pair of first laminate sheets together with the sealant layers of the pair of laminate sheets facing each other to form the pair of body portions; Including, In the step of forming the pair of body portions, the pair of laminated sheets are sandwiched between a sealing bar from the paper base layer side and heated to form a storage space for storing contents and a pouring path extending from the storage space between the pair of body portions. This is a method for manufacturing a paper pouch. [Explanation of symbols]

[0068] Reference Signs List: 1...paper pouch, 2...pair of body portions, 3...bottom, 4...sealant layer, 5...barrier layer, 6...paper base layer, 7...first laminate sheet, 8...sealant layer, 9...barrier layer, 10...base layer, 11...second laminate sheet, 12...storage space, 14...pouring path, 20...heat sealed portion, 32...tip, 110...seal bar, C...contents, L1...planned cutting line.

Claims

1. A refill paper pouch, A pair of opposing body parts and a bottom part folded between the pair of body parts, Each of the pair of body portions is formed of a laminated sheet in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a paper base layer are laminated in this order; the pair of body portions have heat-sealed portions in which the sealant layers of the pair of body portions are fused to each other, The heat seal portion is formed along the outer edges of the pair of body portions, and a storage space for storing contents and a pouring path extending from the storage space are formed between the pair of body portions, The thickness of the paper base layer is greater than the thickness of the sealant layer, The basis weight of the paper base layer is 50 g / m ２ 110g / m or more ２ Below is the Paper pouch.

2. The paper pouch according to claim 1 , wherein the paper base layer has a thickness of 60 μm or more and 150 μm or less.

3. 2. The paper pouch according to claim 1, wherein the width of the pouring path along a planned cutting line that crosses the pouring path is 8 mm or less.

4. The paper pouch according to claim 3 , wherein a distance from the planned cutting line to a tip end of the pouring path in an extension direction of the pouring path is 8 mm or less.

5. 4. The paper pouch according to claim 3, wherein a width of the pouring path along an imaginary line extending parallel to the planned cutting line between the planned cutting line and the tip of the pouring path is greater than a width of the pouring path along the planned cutting line.

6. The paper pouch of claim 1 , wherein the barrier layer is a metal layer comprising aluminum.

7. 2. The paper pouch according to claim 1, having a volume of 100 ml or less.

8. A method for manufacturing a paper pouch having a pair of opposing body sections and a bottom section folded between the pair of body sections, comprising the steps of: preparing a pair of first laminate sheets in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a paper base layer are laminated in this order, and a second laminate sheet in which a sealant layer, a barrier layer having a higher thermal conductivity than the sealant layer, and a base layer are laminated in this order; forming the bottom portion by heat-sealing the second laminate sheet to the pair of first laminate sheets in a state in which the sealant layer of the first laminate sheet and the sealant layer of the second laminate sheet face each other; heat-sealing the pair of first laminate sheets together with the sealant layers of the pair of laminate sheets facing each other to form the pair of body portions; Including, In the step of forming the pair of body portions, the pair of laminated sheets are sandwiched between a sealing bar from the paper base layer side and heated to form a storage space for storing contents and a pouring path extending from the storage space between the pair of body portions. This is a method for manufacturing a paper pouch.

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