Sheet package

Abstract

To provide a sheet package that is excellent in taking out a sheet and in which a packaging bag is made of paper.SOLUTION: A sheet package comprises a pillow packaging bag 10 having a plurality of laminated sheets stored therein and having a pair of seal parts at both ends in a longitudinal direction, and a take-out port 30 formed on an upper surface 11 of the pillow packaging bag 10 and extending in the longitudinal direction of the pillow packaging bag 10. The pillow packaging bag 10 has a paper layer containing paper contents and a resin layer including thermoplastic resin provided on at least either surface of the paper layer, where a ratio of the paper contents in the paper layer is 50% or more. When the number of plies of the sheet is one ply, a length of the take-out port 30 with respect to a distance between the pair of seal parts 40 and 50 in the longitudinal direction of the upper surface 11 is 80% or more and 100% or less, and when the number of plies of the sheet is two ply or more, the length of the take-out port 30 with respect to the distance between the pair of seal parts 40 and 50 in the longitudinal direction of the upper surface 11 is 70% or more and 90% or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sheet package.

Background Art

[0002] A sheet package containing sheets such as paper towels and tissue paper is distributed and used with a plurality of sheets accommodated in a resin film packaging bag. A perforation is formed in the packaging bag of the sheet package, and the package is opened by tearing the perforation. Further, the opened portion of the packaging bag constitutes an outlet for the sheet (for example, Patent Documents 1 and 2).

[0003] In recent years, from the viewpoint of suppressing environmental burdens such as global warming due to CO 2 emissions and marine pollution such as microplastics, there has been a movement to shift the material of the packaging bag in the sheet package from resin to paper.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since a paper packaging bag has less flexibility than a resin packaging bag, when the packaging bag of the sheet package is made of paper, the sheet may get clogged at the outlet or fall into the packaging bag when the sheet is taken out.

[0006] An object of the present invention is to provide a sheet package having a paper packaging bag that is excellent in taking out the sheet.

Means for Solving the Problems

[0007] A first aspect of the present invention relates to a pillow packaging bag that houses a plurality of stacked sheets and has a pair of seal portions at both longitudinal ends, and an outlet formed on the upper surface of the pillow packaging bag and extending in the longitudinal direction of the pillow packaging bag. The pillow packaging bag has a paper layer containing a paper component and a resin layer containing a thermoplastic resin provided on at least one surface of the paper layer. The ratio of the paper component is 50% or more. When the ply number of the sheet is 1 ply, the length of the outlet is 80% or more and 100% or less with respect to the distance between the pair of seal portions in the longitudinal direction of the upper surface. When the ply number of the sheet is 2 plies or more, the length of the outlet is 70% or more and 90% or less with respect to the distance between the pair of seal portions in the longitudinal direction of the upper surface. It is a sheet packaging body.

[0008] In this specification, a pillow packaging bag refers to a packaging bag in which the open end of a tubular packaging bag sheet is sealed. The upper surface of the pillow packaging bag refers to a region extending between a pair of seal portions of the pillow packaging bag. The resin layer provided on at least one surface of the paper layer refers to either a two-layer structure in which the resin layer is provided on one side of the paper layer or a three-layer structure in which the resin layers are laminated on both sides of the paper layer.

[0009] In the first aspect, by using a pillow packaging bag having a paper layer containing a paper component and a resin layer provided on at least one surface of the paper layer, and the ratio of the paper component being 50% or more, it is possible to provide a sheet packaging body in which flexibility is imparted to the pillow packaging bag that houses the sheet.

[0010] Further, an outlet extending in the longitudinal direction of the pillow packaging bag is formed on the upper surface of such a pillow packaging bag, and the ratio of the length of the outlet to the distance between a pair of seal portions in the longitudinal direction of the upper surface of the pillow packaging bag is set to 80% or more and 100% or less when the ply number of the sheet housed in the pillow packaging bag is 1 ply, and 70% or more and 90% or less when the ply number of the sheet is 2 plies or more. This makes it easier to take out the sheet from the outlet and also suppresses the sheet from falling into the pillow packaging bag.

[0011] Also, in the first aspect, since the pillow packaging bag has a paper layer containing a paper component and a resin layer containing a thermoplastic resin provided on at least one surface of the paper layer, the pillow packaging bag can be softened. Thereby, the stiffness of the packaging bag in the sheet package can be suppressed, and followability can be imparted to the pillow packaging bag. Therefore, even when the material of the packaging bag is shifted from resin to paper, a sheet package in which the packaging bag is less likely to be torn during manufacturing or transportation can be provided.

[0012] Also, in the first aspect, since the resin layer provided on at least one surface of the paper layer contains a thermoplastic resin, by heating a part of the pillow packaging bag when sealing (or closing) the pillow packaging bag, the melted resin layer can function as an adhesive (has an adhesive function). Therefore, in the first aspect, a sheet package in which the sealing of the pillow packaging bag is easy can be provided.

[0013] Furthermore, in the first aspect, since the ratio of the paper component in the pillow packaging bag is 50% or more, a sheet package with reduced environmental impact can be provided.

[0014] A second aspect of the present invention is a sheet package in which the basis weight of the paper layer is 10 g / m 2 or more and 40 g / m 2 or less. In the second aspect, by setting the basis weight of the paper layer to be 10 g / m 2 or more and 40 g / m 2 or less, the strength of the pillow packaging bag can be maintained. Therefore, according to the second aspect, a sheet package in which the pillow packaging bag is less likely to be torn can be provided.

[0015] The third aspect according to the present invention is a sheet package in which the paper layer is formed of kraft paper or rayon paper. In this specification, kraft paper refers to paper made from kraft pulp. Rayon paper refers to paper in which rayon fibers chemically synthesized from wood pulp or the like are blended with kraft pulp. Note that, from the viewpoint of achieving both the softness and strength of the packaging bag, rayon paper preferably has a blending ratio of rayon fibers of 20% or less by mass.

[0016] In the third aspect, by forming the paper layer of the pillow packaging bag with kraft paper or rayon paper, it is possible to provide a sheet package in which the strength of the pillow packaging bag is maintained while suppressing the stiffness of the packaging bag.

[0017] The fourth aspect according to the present invention is a sheet package in which the thickness of the resin layer is 5 μm or more and 40 μm or less. In the fourth aspect, by setting the thickness of the resin layer of the pillow packaging bag to 5 μm or more and 40 μm or less, it becomes easier to maintain the ratio of the paper component in the packaging bag at 50% or more. Also, it is possible to provide a sheet package in which the adhesion function of the resin layer during sealing of the pillow packaging bag is maintained while suppressing the stiffness of the packaging bag.

[0018] The fifth aspect according to the present invention is a sheet package in which the thermoplastic resin is low-density polyethylene. In the fifth aspect, by using low-density polyethylene as the thermoplastic resin contained in the resin layer, it is possible to provide a sheet package in which the adhesion function of the resin layer during sealing of the pillow packaging bag is improved while further suppressing the stiffness of the packaging bag.

[0019] The sixth aspect according to the present invention is that the Clark stiffness in the longitudinal direction of the pillow packaging bag is 3 cm 3 / 100 or more and 20 cm 3 / 100 or less. In this specification, the Clark stiffness is measured in accordance with the provisions of JIS P 8143. The longitudinal direction indicates the flow direction of the fibers constituting the pillow packaging bag.

[0020] In the sixth aspect, by setting the Clark stiffness in the longitudinal direction of the pillow packaging bag to 3 cm 3 / 100 or more and 20 cm 3 / 100 or less, the flexibility and followability of the pillow packaging bag are improved. As a result, in the sixth aspect, it becomes easier to take out the sheet from the outlet, and it is possible to further suppress the sheet from falling into the pillow packaging bag.

[0021] The seventh aspect according to the present invention is a sheet package in which the ply number of the sheet is 1 ply and the basis weight of the sheet is 5 g / m 2 or more and 80 g / m 2 or less. In the seventh aspect, since the ply number of the sheet accommodated in the pillow packaging bag is 1 ply, the length of the outlet that is 80% or more and 100% or less of the distance between the pair of seal portions in the longitudinal direction of the upper surface of the pillow packaging bag is applied.

[0022] Furthermore, in the seventh aspect, by setting the basis weight of the 1-ply sheet accommodated in the pillow packaging bag to 5 g / m 2 or more and 80 g / m 2 or less, when accommodating a 1-ply sheet in the sheet package, it becomes easier to take out the sheet from the outlet, and it is possible to further suppress the sheet from falling into the pillow packaging bag.

[0023] The eighth aspect according to the present invention is a sheet package in which the sheet has a softness in the longitudinal direction of 50 mN / 100 mm or more and 350 mN / 100 mm or less, and a softness in the lateral direction of 20 mN / 100 mm or more and 320 mN / 100 mm or less.

[0024] In this specification, the softness indicates the softness measured in accordance with the provisions of JIS L 1096 Method E. The longitudinal direction is the flow direction of the fibers constituting the sheet, and the lateral direction is the direction orthogonal to the flow direction of the fibers constituting the sheet.

[0025] In the eighth aspect, when a single-ply sheet is accommodated in the pillow packaging bag, a sheet having a softness in the longitudinal direction of 50 mN / 100 mm or more and 350 mN / 100 mm or less and a softness in the lateral direction of 20 mN / 100 mm or more and 320 mN / 100 mm or less is used. Thereby, in the sheet package, it becomes easier to further take out the single-ply sheet from the take-out port, and it is possible to further suppress the single-ply sheet from falling into the pillow packaging bag.

[0026] The ninth aspect according to the present invention is a sheet package in which the number of plies of the sheet is 2 plies, and the basis weight of the sheet is 1 g / m per ply 2 or more and 50 g / m 2 or less. In the ninth aspect, since the number of plies of the sheet accommodated in the pillow packaging bag is 2 plies, a length of the take-out port that is 70% or more and 90% or less of the distance between a pair of seal portions in the longitudinal direction on the upper surface of the pillow packaging bag is applied.

[0027] Furthermore, in the ninth aspect, by setting the basis weight of the two-ply sheet accommodated in the pillow packaging bag to 1 g / m per ply 2 or more and 50 g / m 2 or less, when the two-ply sheet is accommodated in the sheet package, it becomes easier to take out the sheet from the take-out port, and it is possible to further suppress the sheet from falling into the pillow packaging bag.

[0028] The tenth aspect according to the present invention is a sheet package in which the sheet has a softness in the longitudinal direction of 15 mN / 100 mm or more and 45 mN / 100 mm or less and a softness in the lateral direction of 10 mN / 100 mm or more and 40 mN / 100 mm or less.

[0029] In the tenth aspect, when a two-ply sheet is accommodated in the pillow packaging bag, a sheet having a softness in the longitudinal direction of 15 mN / 100 mm or more and 45 mN / 100 mm or less and a softness in the transverse direction of 10 mN / 100 mm or more and 40 mN / 100 mm or less is used. Thereby, in the sheet package, it becomes easier to take out the two-ply sheet from the take-out port, and it is possible to further suppress the two-ply sheet from falling into the pillow packaging bag.

Effect of the Invention

[0030] According to one aspect of the present invention, it is possible to provide a sheet package in which the packaging bag is made of paper and which is excellent in taking out the sheet.

Brief Description of the Drawings

[0031]

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Figure 16

MODE FOR CARRYING OUT THE INVENTION

[0032] Embodiments of the present invention will be described in detail with reference to the drawings. In each figure, common parts may be denoted by the same reference numerals and description thereof may be omitted. In each figure, the scale of each member may be different from the actual one. In each figure, a three-dimensional orthogonal coordinate system in three axial directions (X direction, Y direction, Z direction) is used, the longitudinal direction of the packaging bag is the X direction, the width direction is the Y direction, and the height direction (vertical direction or thickness direction) is the Z direction.

[0033] FIG. 1 is a view showing a sheet packaging body according to an embodiment. FIG. 2 is a view showing a sheet accommodated in a packaging bag. FIGS. 3, 4, 5, 6, 7, and 8 are views of the sheet packaging body of FIG. 1 as seen from the upper surface side, lower surface side, front side, back side, left side surface side, and right side surface side, respectively.

[0034] As shown in FIG. 1, the sheet packaging body 100 has a packaging bag 10 and a sheet laminate 20 (a plurality of sheets S). The sheet packaging body 100 is an example of a sheet packaging body according to the present embodiment. The packaging bag 10 is an example of a pillow packaging bag in the sheet packaging body of the present embodiment. The sheet laminate 20 is an example of a plurality of sheets laminated in the sheet packaging body of the present embodiment.

[0035] As shown in Fig. 2, the packaging bag 10 contains a plurality of laminated sheets S (sheet laminate 20). The sheet laminate 20 is accommodated in the packaging bag 10 such that the stacking direction (SD direction) of the sheets S is the height direction (Z direction). The sheet laminate 20 is configured such that the sheets S can be pulled out one by one (one set at a time) through an outlet 30 (opening OP) formed in the packaging bag 10 (see Fig. 16).

[0036] The form of the laminate SL of the sheets S (sheet laminate 20) is not particularly limited. For example, it can be a laminate in which the sheets S are folded and stacked, a laminate in which the sheets S are alternately stacked in a folded state (so-called pop-up type sheet laminate), a laminate in which a plurality of sheets S are simply stacked, etc.

[0037] Also, the dimensions of the sheet S (sheet laminate 20) can be such that the length L2 in the longitudinal direction (X direction) of the packaging bag 10 is about 150 to 260 mm, the width W2 in the width direction (Y direction) orthogonal to the longitudinal direction (X direction) of the packaging bag 10 is about 70 to 150 mm, and the height H2 in the height direction (Z direction) is about 20 to 100 mm. Such a laminate of thin paper can be manufactured, for example, by a rotary or multi-stand interfolder.

[0038] The form of the sheet S is not particularly limited. For example, it can be applied to sanitary thin papers such as paper towels, kitchen papers, tissue papers, toilet papers, etc. These sanitary thin papers also include sanitary thin papers containing a moisturizing component (for example, lotion tissues).

[0039] Also, the use of the sheet S is not particularly limited, and it can be applied to industrial, household, or portable uses. Among these, industrial and household paper towels are preferably used as the sheet in this embodiment.

[0040] The number of plies of the sheet S is not particularly limited, but can be 1 ply or more, preferably 1 ply or 2 plies or more, and more preferably 1 ply or 2 plies. Also, the shape of the sheet S is not particularly limited, but for example, it is preferable that the contour shape is a quadrangle (rectangle, square, etc.) when the sheet is folded.

[0041] The material of the sheet S is not particularly limited, but for example, a sheet such as paper, non-woven fabric or cloth can be used, and preferably paper (paper sheet). When the sheet S is a paper sheet, a base paper mainly made of pulp is used. A known composition in paper sheets can be used for the pulp composition. For example, the blending ratio of pulp can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0042] Also, the pulp composition in the sheet S (paper sheet) is not particularly limited. For example, softwood pulp such as NBKP (needlewood kraft pulp) and NUKP (needlewood unbleached pulp), and hardwood pulp such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp) can be used in any ratio. The ratio of hardwood pulp to softwood pulp is not limited, but is preferably 10:90 to 80:20, and more preferably a pulp composition in which the ratio of softwood pulp to hardwood pulp is higher. Also, wastepaper pulp may be used for the pulp contained in the sheet S (paper sheet).

[0043] The basis weight of the sheet S is not particularly limited and can be adjusted according to the number of plies. The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0044] For example, when the number of plies of the sheet S is 1 ply, the basis weight of the sheet S is 5 g / m 2 or more and 80 g / m 2 or less, preferably 10 g / m 2 or more and 60 g / m 2 or less, and more preferably 15 g / m 2 or more and 45 g / m 2Hereinafter, more preferably 20 g / m 2 or more and 40 g / m 2 or less, more preferably 25 g / m 2 or more and 35 g / m 2 or less. Further, when the ply number of the sheet S is 2 plies, the basis weight of the sheet S is 1 g / m 2 or more and 50 g / m 2 or less, preferably 2 g / m 2 or more and 40 g / m 2 or less, more preferably 3 g / m 2 or more and 30 g / m 2 or less, more preferably 5 g / m 2 or more and 25 g / m 2 or less, more preferably 10 g / m 2 or more and 20 g / m 2 or less. Further, when the sheet S is a nonwoven fabric, the basis weight of the sheet S is desirably 20 g / m 2 or more and 100 g / m 2 or less.

[0045] In addition, the thickness (paper thickness) of the sheet S (paper sheet) is not particularly limited, and the paper thickness measured under the environment of JIS P 8111 (1998) can be adopted. For example, when the sheet S is paper, the paper thickness is 50 μm or more and 600 μm or less per 2 plies, preferably 60 μm or more and 550 μm or less, more preferably 100 μm or more and 400 μm or less.

[0046] The softness of the sheet S is not particularly limited and can be adjusted according to the ply number. The softness is measured in accordance with the provisions of the L 1096 E method.

[0047] For example, when the ply number of the sheet S is 1 ply, the softness in the longitudinal direction of the sheet S is 10 mN / 100 mm or more and 800 mN / 100 mm or less, preferably 30 mN / 100 mm or more and 500 mN / 100 mm or less, more preferably 50 mN / 100 mm or more and 350 mN / 100 mm or less, further preferably 100 mN / 100 mm or more and 300 mN / 100 mm or less, particularly preferably 150 mN / 100 mm or more and 250 mN / 100 mm or less.

[0048] In addition, when the sheet S is single-ply, the softness in the lateral direction is 5 mN / 100 mm or more and 700 mN / 100 mm or less, preferably 10 mN / 100 mm or more and 500 mN / 100 mm or less, more preferably 20 mN / 100 mm or more and 320 mN / 100 mm or less, still more preferably 70 mN / 100 mm or more and 270 mN / 100 mm or less, and particularly preferably 120 mN / 100 mm or more and 220 mN / 100 mm or less.

[0049] Note that the longitudinal direction of the sheet corresponds to the flow direction of the fibers constituting the sheet, and the lateral direction of the sheet corresponds to the direction orthogonal to the flow direction of the fibers constituting the sheet.

[0050] In addition, when the ply number of the sheet S is two-ply, the softness in the longitudinal direction of the sheet S is 5 mN / 100 mm or more and 100 mN / 100 mm or less, preferably 10 mN / 100 mm or more and 70 mN / 100 mm or less, more preferably 15 mN / 100 mm or more and 45 mN / 100 mm or less, still more preferably 20 mN / 100 mm or more and 40 mN / 100 mm or less, and particularly preferably 25 mN / 100 mm or more and 35 mN / 100 mm or less.

[0051] In addition, when the sheet S is two-ply, the softness in the lateral direction is 3 mN / 100 mm or more and 100 mN / 100 mm or less, preferably 5 mN / 100 mm or more and 70 mN / 100 mm or less, more preferably 10 mN / 100 mm or more and 40 mN / 100 mm or less, still more preferably 15 mN / 100 mm or more and 35 mN / 100 mm or less, and particularly preferably 20 mN / 100 mm or more and 30 mN / 100 mm or less.

[0052] In addition, the sheet S (paper sheet) may be embossed. Such embossing can be carried out by a known embossing method.

[0053] FIG. 9 is a partial cross-sectional view of the upper surface in the region R1 of FIG. 3. The packaging bag 10 has a paper layer 10A containing a paper component and a resin layer (resin layer 10B, or resin layers 10B and 10C) containing a thermoplastic resin provided on at least one surface of the paper layer 10A (FIGS. 9 and 10). And the ratio of the paper component in the packaging bag 10 is 50% or more.

[0054] Here, the paper component is, for example, something obtained by adhering plant fibers (pulp). The pulp composition in the paper component is not limited, but preferably has a pulp composition in which the ratio of softwood pulp is higher than that of hardwood pulp. Also, waste paper pulp may be used for the pulp.

[0055] In the present embodiment, the resin layer provided on at least one surface of the paper layer 10A is, for example, a two-layer structure in which the resin layer 10B is provided on one side of the paper layer 10A (FIG. 9), or a three-layer structure in which the resin layers 10B and 10C are laminated on both surfaces of the paper layer 10A (FIG. 10).

[0056] The material of the paper layer 10A constituting the packaging bag 10 is not particularly limited, but can be formed of, for example, kraft paper or rayon paper. Here, kraft paper is paper made from kraft pulp. Rayon paper is made by blending rayon fibers chemically synthesized from wood pulp or the like with kraft pulp. Note that, from the viewpoint of achieving both the softness and strength of the packaging bag 10, rayon paper preferably has a blending ratio of rayon fibers of 20% or less by mass ratio.

[0057] The basis weight of the paper layer 10A constituting the packaging bag 10 is not limited, but is preferably 10 g / m 2 to 40 g / m 2 or less, more preferably 15 g / m 2 to 35 g / m 2 or less, still more preferably 20 g / m 2 to 30 g / m 2 or less. The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0058] The thickness of the packaging bag 10 (paper layer 10A) is not limited, but for example, it is preferably 20 μm or more and 100 μm or less, more preferably 25 μm or more and 90 μm or less, and even more preferably 40 μm or more and 75 μm or less. The thickness is measured in accordance with the provisions of JIS P 8118 (2014).

[0059] The material of the thermoplastic resin contained in the resin layers 10B and 10C constituting the packaging bag 10 is not particularly limited, but is preferably low-density polyethylene. As the low-density polyethylene, either high-pressure low-density polyethylene (LDPE) or linear low-density polyethylene (L-LDPE) may be used.

[0060] The thickness of the resin layers 10B and 10C constituting the packaging bag 10 is not limited, but is preferably 5 μm or more and 40 μm or less, more preferably 7 μm or more and 35 μm or less, and even more preferably 9 μm or more and 30 μm or less. The thickness is measured in accordance with the provisions of JIS P 8118 (2014).

[0061] The basis weight of the packaging bag 10 is not limited, but is preferably 20 g / m 2 or more and 70 g / m 2 or less, more preferably 25 g / m 2 or more and 65 g / m 2 or less, even more preferably 30 g / m 2 or more and 60 g / m 2 or less. The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0062] The thickness of the packaging bag 10 is not limited, but for example, it is 25 μm or more and 105 μm or less, preferably 30 μm or more and 95 μm or less, more preferably 45 μm or more and 80 μm or less. The thickness is measured in accordance with the provisions of JIS P 8118 (2014).

[0063] The density of the packaging bag 10 is not limited, but for example, it is 0.1 g / m 3 or more and 1.5 g / m 3 or less and 0.3 g / m 3More than 1.2g / m 3 Less than 0.5 g / m 3 More than 0.9g / m 3 The density is measured in accordance with the provisions of JIS P 8118 (2014).

[0064] The tensile strength of the packaging bag 10 is not limited, but is, for example, 1 kN / m to 6 kN / m, preferably 1.3 kN / m to 5.5 kN / m, more preferably 1.5 kN / m to 5 kN / m, in the longitudinal direction (flow direction) of the fibers, and 0.1 kN / m to 2.5 kN / m, preferably 0.2 kN / m to 2.4 kN / m, more preferably 0.3 kN / m to 2.3 kN / m, in the transverse direction (direction perpendicular to the flow direction). The tensile strength is measured in accordance with the provisions of JIS P 8113 (2006).

[0065] The tensile strength is measured in accordance with the provisions of JIS P 8113 (2006). The vertical direction of the packaging bag corresponds to the flow direction of the fibers constituting the packaging bag, and the horizontal direction of the packaging bag corresponds to the direction perpendicular to the flow direction of the fibers constituting the packaging bag.

[0066] The tear strength of the packaging bag 10 is not limited, but is, for example, 70 mN to 350 mN, preferably 80 mN to 340 mN, more preferably 90 mN to 330 mN, in the longitudinal direction (flow direction) of the fibers, and 250 mN to 950 mN, preferably 280 mN to 930 mN, more preferably 300 mN to 920 mN, in the transverse direction (direction perpendicular to the flow direction). The tear strength is measured in accordance with the provisions of JIS P 8116 (2000).

[0067] The Clark stiffness of the packaging bag 10 is not particularly limited, but the Clark stiffness in the vertical direction is preferably 3 cm. 3 / 100 or more 20cm 3 / 100 or less, more preferably 4cm 3 / 100 or more 18cm 3 / 100 or less, preferably 5cm 3 / 100 or more 16cm3 It is 100 or less. The Clark stiffness is measured in accordance with the provisions of JIS P 8143.

[0068] The packaging bag 10 has an upper surface 11, a lower surface 12, side surfaces 13, 14, gusset surfaces 15, and 16. In the packaging bag 10, the upper surface 11 and the lower surface 12 face each other in the vertical direction (Z direction), the side surfaces 13 and 14 face each other in the width direction (Y direction), and the gusset surfaces 15 and 16 face each other in the longitudinal direction (X direction).

[0069] Note that the upper surface 11 and the lower surface 12 are connected via a seal portion 40 on the gusset surface 15 side and via a seal portion 50 on the gusset surface 16 side. That is, the upper surface 11 of the packaging bag 10 is a region that extends between a pair of seal portions 40 and 50 of the packaging bag 10 (FIGS. 1, 3 to 8).

[0070] Also, the dimensions of the packaging bag 10 are arbitrary. For example, the length L1 in the longitudinal direction (X direction) of the packaging bag 10 can be about 150 to 260 mm, the width W1 in the width direction (Y direction) orthogonal to the longitudinal direction (X direction) of the packaging bag 10 can be about 70 to 150 mm, and the height H1 in the height direction (Z direction) can be about 20 to 100 mm. Note that the dimensions of this packaging bag 10 indicate the dimensions in a state where the sheet laminate 20 is accommodated in the packaging bag 10.

[0071] An outlet 30 extending in the longitudinal direction (X direction) of the packaging bag 10 is formed on the upper surface 11 of the packaging bag 10. Specifically, a cut line 30 for cracking is formed in the outlet 30. Here, the cut line 30 for cracking indicates a cut line in which cuts C and ties T (portions that are not cut between two cuts C, C) are alternately arranged, and when the tie T breaks, the adjacent cuts C become continuous cuts (FIGS. 1, 3, 11).

[0072] FIG. 11 is a partially enlarged view of region R2 in FIG. 3. The tear cut line 30 is composed of a linear perforation M in which cuts C and ties T are alternately arranged (FIGS. 1, 3, 11). The tear cut line 30 is formed on the upper surface 11 of the packaging bag 10. In the packaging bag 10, by tearing the perforation M, an opening OP is formed on the upper surface 11 of the packaging bag 10 through which the sheet S is pulled out (FIGS. 3, 15).

[0073] The length L3 of the tear cut line 30 is not particularly limited. For example, in this embodiment, it is adjusted to a length that can be accommodated inside the upper surface 11 of the packaging bag 10 (FIG. 3). Note that the tear cut line 30 is an example of the tear cut line in the sheet packaging body of this embodiment.

[0074] The form of the tear cut line 30 is not particularly limited. However, in the case of a structure (two-layer structure) in which the resin layer 10B is provided on one side of the paper layer 10A, it is preferable that the cut C of the tear cut line 30 penetrates the paper layer 10A and the resin layer 10B (FIGS. 9, 12). Here, penetrating the paper layer 10A and the resin layer 10B means that the cut C of the tear cut line 30 penetrates the laminated paper layer 10A and resin layer 10B in the thickness direction (FIG. 12).

[0075] Also, in the case of a structure (three-layer structure) in which the resin layers 10B and 10C are laminated on both sides of the paper layer 10A, it is preferable that the cut C of the tear cut line 30 penetrates the paper layer 10A and the resin layers 10B and 10C (FIGS. 10, 13). Here, penetrating the paper layer 10A and the resin layers 10B and 10C means that the cut C of the tear cut line 30 penetrates the laminated paper layer 10A and resin layers 10B and 10C in the thickness direction (FIG. 13).

[0076] The length D1 of the cut C in the tear cut line 30 is not particularly limited, but is preferably 3 mm or more and 8 mm or less, more preferably 2 mm or more and 7.5 mm or less, and even more preferably 2.5 mm or more and 7 mm or less. Here, the length of the cut indicates the length of each cut C of the tear cut line 30.

[0077] In addition, the length of the tie T in the tear cut line 30 is not particularly limited, but is preferably 0.3 mm or more and 2.5 mm or less, more preferably 0.5 mm or more and 1.5 mm or less, and even more preferably 0.8 mm or more and 1.2 mm or less. Here, the length of the tie indicates the length of each tie T of the tear cut line.

[0078] In this embodiment, the ratio of the cut C in the tear cut line 30 is not particularly limited, but is preferably 60% or more and 95% or less, more preferably 65% or more and 90% or less, and even more preferably 70% or more and 85% or less. The ratio of the cut indicates the ratio of the length D1 of the cut C to the total of the lengths D1 and D2 of the adjacent cut C and tie T in the tear cut line 30.

[0079] In the sheet package 100 of this embodiment, the length L3 of the tear cut line 30 is adjusted according to the number of plies of the sheet S. Specifically, when the number of plies of the sheet S is 1 ply, the length L3 of the tear cut line 30 is 80% or more and 100% or less, preferably 82% or more and 100% or less, and more preferably 85% or more and 100% or less with respect to the length L1 in the longitudinal direction (X direction) of the packaging bag 10.

[0080] In addition, when the number of plies of the sheet S is 2 plies or more, the length L3 of the tear cut line 30 is 70% or more and 90% or less, preferably 72% or more and 88% or less, and more preferably 75% or more and 85% or less with respect to the length L1 in the longitudinal direction (X direction) of the packaging bag 10.

[0081] Here, the length in the longitudinal direction (X direction) of the packaging bag 10 corresponds to the distance L1 between the pair of seal portions 40 and 50 in the longitudinal direction (X direction) of the upper surface 11. Also, the length L3 of the tear cut line 30 corresponds to the length L3 of the outlet 30.

[0082] The method for forming the tear line 30 is arbitrary, and for example, it can be formed using the instrument 90 shown in FIG. 14. Specifically, the packaging bag 10 (packaging bag sheet) is disposed between the needle portion 91 and the base portion 92 of the instrument 90, and the tip 91A of the needle portion 91 is pierced toward the receiving groove 92A of the base portion 92, whereby the tear line 30 for tearing can be formed.

[0083] In the sheet package 100, ventilation holes (not shown) may be formed in the packaging bag 10. The ventilation holes can function as air holes of the packaging bag 10. The method for forming the ventilation holes is arbitrary, and for example, the same method as the method for forming the above-described tear line 30 for tearing can be used.

[0084] The position of the ventilation holes is not limited. For example, the ventilation holes can be provided on the side surfaces 13 and 14 of the packaging bag 10. The number of the ventilation holes is not limited, and a plurality of ventilation holes can be provided. The shape of the ventilation holes is not limited, and for example, it can be circular in plan view. The dimension of the ventilation holes is not limited, and for example, it can be a diameter dimension of about 2 mm.

[0085] In the sheet package 100 of the present embodiment, the packaging bag 10 is formed of a pillow packaging bag having a pair of seal portions 40 and 50 at both ends in the longitudinal direction (X direction). Specifically, seal portions (end seals) 40 and 50 are formed on the front surfaces 15 and 16 of the packaging bag 10, and a seal portion (bottom seal) 60 is formed on the lower surface 12 of the packaging bag 10, and the sheet S (sheet laminate 20) is pillow-packaged.

[0086] Here, the pillow packaging bag is formed by processing a packaging bag sheet (not shown) into a tubular shape and sealing (sealing) the open end of the tubular packaging bag sheet. In the present embodiment, the tubular packaging bag sheet constituting the pillow packaging bag 10 may be folded in a gusset shape.

[0087] The modes of the seal portions 40, 50, and 60 are not particularly limited. For example, when the packaging bag 10 is composed only of the paper layer 10A, the seal portions 40, 50, and 60 can be adhered with an adhesive (not shown) (FIG. 9).

[0088] Note that, in the packaging bag 10, the seal portions 40, 50, and 60 are heat-sealed. Here, heat-sealing means heating a part of the packaging bag sheet and welding parts of the packaging bag sheet together.

[0089] Specifically, in the two-layer structure packaging bag (pillow packaging bag) 10 shown in FIG. 9, for example, with the resin layer 10B disposed inside or outside the packaging bag 10, the seal portions 40, 50, and 60 are heat-sealed. Also, in the three-layer structure packaging bag (pillow packaging bag) 10 shown in FIG. 10, with either the resin layer 10B or the resin layer 10C disposed inside the packaging bag 10, the seal portions 40, 50, and 60 are heat-sealed.

[0090] The heating temperature in heat-sealing is arbitrary. For example, when the resin layer 10B is disposed outside the packaging bag 10 in the two-layer structure shown in FIG. 9, the seal portions 40, 50 may be sealed with an adhesive and adjusted to the temperature at which the adhesive welds. Also, when the resin layer 10B is disposed inside the packaging bag 10 in the two-layer structure shown in FIG. 9, or when either the resin layer 10B or 10C is disposed inside the packaging bag 10 in the three-layer structure shown in FIG. 10, it is preferably adjusted to 140°C or higher and 180°C or lower, more preferably 140°C or higher and 170°C or lower, and still more preferably 140°C or higher and 160°C or lower.

[0091] In this embodiment, as described above, by using the pillow packaging bag 10 having the paper layer 10A containing a paper component and a resin layer (resin layer 10B, or resin layers 10B and 10C) provided on at least one surface of the paper layer 10A, and with the ratio of the paper component being 50% or more, a sheet package 100 with flexibility imparted to the pillow packaging bag 10 in which the sheet S is accommodated can be provided (FIG. 16).

[0092] In addition, in the present embodiment, an outlet 30 extending in the longitudinal direction (X direction) of the pillow packaging bag 10 is formed on the upper surface 11 of such a pillow packaging bag 10. The ratio of the length L3 of the outlet 30 to the distance L1 between a pair of seal portions 40 and 50 in the longitudinal direction (X direction) of the upper surface 11 of the pillow packaging bag 10 is set to 80% or more and 100% or less when the number of plies of the sheet S accommodated in the pillow packaging bag 10 is 1 ply, and 70% or more and 90% or less when the number of plies of the sheet S is 2 plies or more. This makes it easier to take out the sheet S from the outlet 30 and can also suppress the sheet S from falling into the pillow packaging bag 10.

[0093] In addition, in the present embodiment, the pillow packaging bag 10 has a paper layer 10A containing a paper component and a resin layer 10B containing a thermoplastic resin provided on at least one surface of the paper layer 10A, or resin layers 10B and 10C. Thus, the pillow packaging bag 10 can be made soft. Thereby, the feeling of stiffness of the packaging bag 10 can be suppressed, and followability can be imparted to the pillow packaging bag 10. Therefore, even when the material of the packaging bag 10 in the sheet package 100 is shifted from resin, a sheet package 100 in which the packaging bag is not easily torn during manufacturing or transportation can be provided.

[0094] In addition, in the present embodiment, since the resin layer 10B provided on at least one surface of the paper layer 10A, or the resin layers 10B and 10C contain a thermoplastic resin, when sealing (or closing) the pillow packaging bag 10, by heating a part of the pillow packaging bag 10, the melted resin layer can function as an adhesive (has an adhesive function). Therefore, in the present embodiment, a sheet package 100 in which the pillow packaging bag 10 can be easily sealed can be provided.

[0095] Furthermore, in the present embodiment, since the ratio of the paper component in the pillow packaging bag 10 is 50% or more, a sheet package 100 with reduced environmental impact can be provided.

[0096] In the present embodiment, as described above, the basis weight of the paper layer 10A is 10 g / m 2 or more and 40 g / m 2By doing the following, the strength of the pillow packaging bag can be maintained. Therefore, according to the present embodiment, a sheet package in which the pillow packaging bag is difficult to tear can be provided.

[0097] In the present embodiment, as described above, by forming the paper layer 10A with kraft paper or rayon paper, a sheet package 100 can be provided in which the strength of the pillow packaging bag 10 is maintained while suppressing the stiffness of the packaging bag 10.

[0098] In the present embodiment, as described above, by setting the thickness of the resin layer 10B of the pillow packaging bag 10, or the resin layers 10B and 10C, to 5 μm or more and 40 μm or less, it becomes easier to maintain the ratio of the paper component in the packaging bag 10 at 50% or more. Also, a sheet package can be provided in which the adhesion function of the resin layer during sealing of the pillow packaging bag 10 is maintained while suppressing the stiffness of the packaging bag 10 in the sheet package 100.

[0099] In the present embodiment, as described above, by using low-density polyethylene as the thermoplastic resin contained in the resin layer 10B of the pillow packaging bag 10, or the resin layers 10B and 10C, a sheet package can be provided in which the adhesion function of the resin layer during sealing of the pillow packaging bag 10 is improved while further suppressing the stiffness of the pillow packaging bag 10.

[0100] In the present embodiment, as described above, the Clark stiffness in the longitudinal direction of the pillow packaging bag 10 is 3 cm 3 / 100 or more and 20 cm 3 / 100 or less, whereby the flexibility and followability of the pillow packaging bag 10 are improved. As a result, in the present embodiment, it becomes easier to take out the sheet S from the take-out port 30, and it is further possible to suppress the sheet S from falling into the pillow packaging bag 10.

[0101] In this embodiment, as described above, since the number of plies of the sheet S accommodated in the pillow packaging bag 10 is 1 ply, the length L3 of the outlet 30 is 80% or more and 100% or less with respect to the distance L1 between the pair of seal portions 40 and 50 in the longitudinal direction (X direction) of the upper surface 11 of the pillow packaging bag 10 is applied.

[0102] Furthermore, in this embodiment, the basis weight of the single-ply sheet S accommodated in the pillow packaging bag 10 is 5 g / m 2 or more and 80 g / m 2 or less. By doing so, when the single-ply sheet S is accommodated in the sheet package 100, the sheet S can be more easily taken out from the outlet 30, and the fall of the sheet S into the pillow packaging bag 10 can be further suppressed.

[0103] In this embodiment, as described above, when the single-ply sheet S is accommodated in the pillow packaging bag 10, a sheet S having a softness in the longitudinal direction of 50 mN / 100 mm or more and 350 mN / 100 mm or less and a softness in the lateral direction of 20 mN / 100 mm or more and 320 mN / 100 mm or less is used. Thereby, in the sheet package 100, the single-ply sheet S can be more easily taken out from the outlet 30, and the fall of the single-ply sheet S into the pillow packaging bag 10 can be further suppressed.

[0104] In this embodiment, as described above, since the number of plies of the sheet S accommodated in the pillow packaging bag 10 is 2 plies, the length L3 of the outlet 30 is 70% or more and 90% or less with respect to the distance L1 between the pair of seal portions 40 and 50 in the longitudinal direction (X direction) of the upper surface 11 of the pillow packaging bag 10 is applied.

[0105] Furthermore, in this embodiment, the basis weight of the two-ply sheet S accommodated in the pillow packaging bag 10 is 1 g / m per ply 2 or more and 50 g / m 2 or less. By doing so, when the two-ply sheet S is accommodated in the sheet package 100, the sheet S can be more easily taken out from the outlet 30, and the fall of the sheet S into the pillow packaging bag 10 can be further suppressed.

[0106] In this embodiment, as described above, when the two-ply sheet S is accommodated in the pillow packaging bag 10, the sheet S having a softness in the longitudinal direction of 15 mN / 100 mm or more and 45 mN / 100 mm or less and a softness in the lateral direction of 10 mN / 100 mm or more and 40 mN / 100 mm or less is used. Thereby, in the sheet package 100, the two-ply sheet S can be more easily taken out from the outlet 30, and the fall of the two-ply sheet S into the pillow packaging bag 10 can be further suppressed.

Example

[0107] Hereinafter, the present invention will be specifically described with reference to further examples. The evaluation of the examples and comparative examples was performed by the following tests.

[0108] [Test Specimen] As test specimens, sheet packages 100 in which a plurality of sheets S (sheet laminate 20) were pillow-packaged in a packaging bag 10 were prepared (Figs. 1 to 8). The sheet laminate 20 is a paper towel in which the sheets S are laminated in a folded state. A single (one-ply) paper towel (product name "Elvire Paper Towel Eco Dry (medium size)", manufactured by Daio Paper Corporation, 200 sheets, height H1: 67 mm, length L1: 210 mm, width (depth) W1: 115 mm, basis weight: 30 g / m 2 , longitudinal softness 206 mN / 100 mm, lateral softness 177 mN / 100 mm), and a double (two-ply) paper towel (product name "Eliel Paper Towel Smart Type Double (medium size)", manufactured by Daio Paper Corporation, 200 sets, height H1: 60 mm, length L1: 210 mm, width (depth) W1: 115 mm, basis weight 16 g / m 2 ×2, longitudinal softness 31 mN / 100 mm, lateral softness 25 mN / 100 mm) were used respectively. A perforation M (tear line 30 for opening) was formed on the upper surface 11 of the pillow packaging bag 10.

[0109] [Basis Weight] The basis weight of the packaging bag 10 in the sheet package 100 (test specimen) was measured in accordance with the provisions of JIS P 8124 (2011). The unit of the basis weight is g / m 2 is used.

[0110] [Thickness] The thickness of the packaging bag 10 in the test specimen was measured in accordance with the provisions of JIS P 8118 (2014). The unit of the thickness is μm.

[0111] [Density] The density of the packaging bag 10 in the test specimen was measured in accordance with the provisions of JIS P 8118 (2014). The unit of the density is g / m 3 is used.

[0112] [Tensile strength] For the packaging bag 10 in the test specimen, in accordance with the provisions of JIS P 8113 (2006), using a tensilon universal testing machine (manufactured by A&D, RTG-1210), the tensile strength (mN) in the longitudinal direction (flow direction) and the transverse direction (direction perpendicular to the flow direction) was measured.

[0113] [Elongation] For the packaging bag 10 in the test specimen, in accordance with the provisions of JIS P 8113 (2006), using a tensilon universal testing machine (manufactured by A&D, RTG-1210), the elongation (%) in the longitudinal direction (flow direction) and the transverse direction (direction perpendicular to the flow direction) was measured.

[0114] [Tear strength] For the packaging bag 10 in the test specimen, in accordance with the provisions of JIS P 8116 (2000), using a tear strength tester (manufactured by Kumagai Riki Kogyo Co., Ltd., Elmendorf tear strength tester (digital display type)), the tear strength in the longitudinal direction (flow direction) and the transverse direction (direction perpendicular to the flow direction) of the fiber was measured.

[0115] [Bekk smoothness] The Bekk smoothness of the packaging bag 10 in the test specimen was measured in accordance with the provisions of JIS P 8119 (1998). The unit of the Bekk smoothness is seconds.

[0116] [Softness of packaging bag] For the packaging bag 10 of the test piece, in accordance with the handle ometer method according to JIS L 1096 E method, using a handle ometer (manufactured by Kumagai Riki Kogyo Co., Ltd., a hand feel measuring instrument), the softness was measured. The test piece was 100 mm × 100 mm in size, and the clearance was 20 mm. The softness of the packaging bag was measured 5 times each in the front - longitudinal direction (flow direction) and the front - transverse direction (direction perpendicular to the flow direction), and the average value of the 5 measurements was expressed in units of mN / 100 mm.

[0117] [Softness of sheet] For the sheet S (1 - ply and 2 - ply) in the test piece, in accordance with the handle ometer method according to JIS L 1096 E method, using a handle ometer (manufactured by Kumagai Riki Kogyo Co., Ltd., a hand feel measuring instrument), the softness was measured. The test piece was 100 mm × 100 mm in size, and the clearance was 20 mm. For the 1 - ply sheet, the softness was measured 5 times each in the front - longitudinal direction (flow direction) and the front - transverse direction (direction perpendicular to the flow direction), and for the 2 - ply sheet, the softness was measured 5 times each in the longitudinal direction (flow direction) and the transverse direction (direction perpendicular to the flow direction), and the average value of the 5 measurements was expressed in units of mN / 100 mm.

[0118] [Clark stiffness] The Clark stiffness of the packaging bag 10 of the test piece was measured in accordance with the provisions of JIS P 8143 (2009). The unit of Clark stiffness is cm 3 / 100.

[0119] [Initial extractability] The ease of extraction (initial extractability) when taking out the sheets S from the first 1 sheet (1 set) to 10 sets of the sheet laminate 20 through the opened outlet 30 (opening OP) of the pillow packaging bag 10 of the sheet package 100 was evaluated. The evaluation of the initial extractability was carried out according to the following criteria, with 3 or more being good and 2 or less being poor. <For both single and double> 5: Very easy to extract 4: Easy to take out 3: Can be taken out 2: Can be taken out but difficult to take out 1: Cannot be taken out

[0120] [Pop-up property] When the sheets S are pulled out from the sheet laminate 20 housed in the pillow packaging bag 10 of the sheet package 10, from the first sheet (one set) to the last sheet (one set) of the sheet laminate 20 through the opened outlet 30 (opening OP) of the pillow packaging bag 10, the number of times that the sheets S are held at the outlet 30 but a part of the sheets does not come out of the outlet was measured. The evaluation of the pop-up property was carried out according to the following criteria, with 3 or more being good and 2 or less being poor. <Single> 5: 0 to 25 times 4: 26 to 50 times 3: 51 to 75 times 2: 76 to 100 times 1: 101 times or more <Double> 5: 0 to 10 times 4: 11 to 20 times 3: 21 to 30 times 2: 31 to 40 times 1: 41 times or more

[0121] [Non-falling property] When the sheets are taken out from the sheet laminate 20 housed in the pillow packaging bag 10 of the sheet package 10, from the first sheet (one set) to the last sheet (one set) of the sheet laminate 20 through the opened outlet 30 (opening OP) of the pillow packaging bag 10, the number of times that the sheets S are not held at the outlet 30 and fall into the pillow packaging bag 10 was measured. The evaluation of the non-falling property was carried out according to the following criteria, with 3 or more being good and 2 or less being poor. <Single> 5: 0 to 10 times 4: 11 to 20 times 3: 21 to 30 times 2: 31 to 40 times 1: 41 times or more <Double> 5: 0 to 5 times 4: 6 to 15 times 3:16 to 25 times 2:26 to 35 times 1:36 times or more

[0122] [Orthostatic] When the sheet laminate 20 stored in the pillow packaging bag 10 of the sheet packaging body 100 was pulled out from the first set to the last set of the sheet laminate 20 through the opened outlet 30 (opening OP) of the pillow packaging bag 10, the number of times the sheet S continued to stand up while being held at the outlet 30 was measured. The evaluation of orthostatic property was carried out based on the following criteria for doubles only, with 3 or more being good and 2 or less being poor. <Double> 5:Up to 80 sets 4:Up to 60 sets 3:Up to 40 sets 2:Up to 20 sets 1:0 times

[0123] Hereinafter, the materials used in the examples and comparative examples will be described.

[0124] [Material 1] For the paper layer 10A, rayon paper with a basis weight of 20 g / m 2 was used, and for the resin layer 10B, low-density polyethylene with a thickness of 11 μm was used to form Material 1. The properties (basis weight, thickness, density, tensile strength, elongation, tear strength, Bekk smoothness, softness, Clark stiffness) of Material 1 are shown in Table 1.

[0125] [Material 2] For the paper layer 10A, rayon paper with a basis weight of 30 g / m 2 was used, and Material 2 was formed in the same manner as Material 1 except for this. The properties of Material 2 are shown in Table 1.

[0126] [Material 3] For the paper layer 10A, kraft paper with a basis weight of 30 g / m 2 was used, and Material 3 was formed in the same manner as Material 1 except for this. The properties of Material 3 are shown in Table 1.

[0127] [Material 4] Material 4 was configured in the same manner as Material 3, except that low-density polyethylene with a thickness of 15 μm was used for the resin layer 10B. The properties of Material 4 are shown in Table 1.

[0128] [Material 5] Material 5 was configured in the same manner as Material 1, except that a paper layer was not formed and low-density polyethylene with a thickness of 22 μm was used for the resin layer. The properties of Material 5 are shown in Table 1.

[0129] Hereinafter, examples and comparative examples will be described.

[0130] [Example 1] Material 2 was used for the packaging bag 10, the resin layer 10B was disposed inside the packaging bag 10, a single sheet was used as the sheet S (sheet laminate 20), and the perforation ratio of the packaging bag 10 (the ratio of the length L3 of the tear cut line 30 to the length L1 of the packaging bag 10 in the longitudinal direction (X direction)) was set to 85%. The results are shown in Table 2.

[0131] [Example 2] It was produced and evaluated in the same manner as in Example 1, except that the perforation ratio was set to 100%. The results are shown in Table 2.

[0132] [Example 3] It was produced and evaluated in the same manner as in Example 2, except that the resin layer 10B was disposed outside the packaging bag 10. The results are shown in Table 2.

[0133] [Example 4] It was measured and evaluated in the same manner as in Example 1, except that Material 3 was used instead of Material 2. The results are shown in Table 2.

[0134] [Example 5] It was measured and evaluated in the same manner as in Example 2, except that Material 3 was used instead of Material 2. The results are shown in Table 2.

[0135] [Example 6] It was measured and evaluated in the same manner as in Example 2, except that Material 4 was used instead of Material 2. The results are shown in Table 2.

[0136] [Example 7] Measurement and evaluation were carried out in the same manner as in Example 3, except that Material 3 was used instead of Material 2. The results are shown in Table 2.

[0137] [Example 8] Measurement and evaluation were carried out in the same manner as in Example 1, except that Material 1 was used instead of Material 2. The results are shown in Table 2.

[0138] [Example 9] Measurement and evaluation were carried out in the same manner as in Example 2, except that Material 1 was used instead of Material 2. The results are shown in Table 2.

[0139] [Comparative Example 1] Measurement and evaluation were carried out in the same manner as in Example 1, except that the stitch ratio was set to 75%. The results are shown in Table 3.

[0140] [Comparative Example 2] Measurement and evaluation were carried out in the same manner as in Comparative Example 1, except that Material 3 was used instead of Material 2. The results are shown in Table 3.

[0141] [Comparative Example 3] Measurement and evaluation were carried out in the same manner as in Comparative Example 1, except that Material 1 was used instead of Material 2 and the stitch ratio was set to 65%. The results are shown in Table 3.

[0142] [Comparative Example 4] Measurement and evaluation were carried out in the same manner as in Comparative Example 1, except that Material 1 was used instead of Material 2. The results are shown in Table 3.

[0143] [Comparative Example 5] Measurement and evaluation were carried out in the same manner as in Example 2, except that Material 5 was used instead of Material 2. The results are shown in Table 3.

[0144] [Example 10] Measurement and evaluation were carried out in the same manner as in Example 1, except that double was used as the sheet S (sheet laminate 20) and the stitch ratio was set to 75%. The results are shown in Table 4.

[0145] [Example 11] Measurement and evaluation were performed in the same manner as in Example 1, except that double was used as the sheet S (sheet laminate 20). The results are shown in Table 4.

[0146] [Example 12] Production and evaluation were performed in the same manner as in Example 11, except that the resin layer 10B was disposed outside the packaging bag 10. The results are shown in Table 4.

[0147] [Example 13] Measurement and evaluation were performed in the same manner as in Example 10, except that Material 3 was used instead of Material 2. The results are shown in Table 4.

[0148] [Example 14] Measurement and evaluation were performed in the same manner as in Example 11, except that Material 3 was used instead of Material 2. The results are shown in Table 4.

[0149] [Example 15] Measurement and evaluation were performed in the same manner as in Example 12, except that Material 3 was used instead of Material 2. The results are shown in Table 4.

[0150] [Example 16] Measurement and evaluation were performed in the same manner as in Example 10, except that Material 4 was used instead of Material 2. The results are shown in Table 4.

[0151] [Example 17] Measurement and evaluation were performed in the same manner as in Example 10, except that Material 1 was used instead of Material 2. The results are shown in Table 4.

[0152] [Example 18] Measurement and evaluation were performed in the same manner as in Example 11, except that Material 1 was used instead of Material 2. The results are shown in Table 4.

[0153] [Comparative Example 6] Measurement and evaluation were performed in the same manner as in Example 10, except that the stitch ratio was set to 65%. The results are shown in Table 5.

[0154] [Comparative Example 7] Measurement and evaluation were performed in the same manner as in Comparative Example 6, except that the stitch ratio was set to 100%. The results are shown in Table 5.

[0155] [Comparative Example 8] Measurement and evaluation were performed in the same manner as in Comparative Example 6, except that Material 3 was used instead of Material 2. The results are shown in Table 5.

[0156] [Comparative Example 9] Measurement and evaluation were performed in the same manner as in Comparative Example 7, except that Material 3 was used instead of Material 2. The results are shown in Table 5.

[0157] [Comparative Example 10] Measurement and evaluation were performed in the same manner as in Comparative Example 7, except that Material 1 was used instead of Material 2. The results are shown in Table 5.

[0158] [Comparative Example 11] Measurement and evaluation were performed in the same manner as in Comparative Example 7, except that Material 5 was used instead of Material 2. The results are shown in Table 5.

[0159]

Table 1

[0160]

Table 2

[0161]

Table 3

[0162]

Table 4

[0163]

Table 5

[0164] From Tables 1 and 2, for the pillow packaging bags made of Materials 1 to 4, the test specimens (sheet packages) containing a single sheet (sheet laminate) with the stitch ratio of the pillow packaging bags being 85% to 100% had good initial extractability, pop-up property, and non-falling property (Examples 1 to 9).

[0165] In contrast, from Tables 1 and 3, the sheet packages (Comparative Examples 1 to 4) containing a single sheet (sheet laminate) in the pillow packaging bags made of Materials 1 to 3 with the stitch ratio of the packaging bags being 75% or less had at least one of poor initial extractability, pop-up property, and non-falling property. Note that the sheet package (Comparative Example 5) containing a single sheet (sheet laminate) in the pillow packaging bag made of Material 5 with the stitch ratio of the packaging bag being 100% was formed only of resin as the material of the pillow packaging bag.

[0166] Also, from Tables 1 and 4, for the pillow packaging bags made of Materials 1 to 4, the sheet packages (Examples 10 to 18) containing a double sheet (sheet laminate) with the stitch ratio of the pillow packaging bags being 75% to 85% had good initial extractability, pop-up property, and non-falling property.

[0167] In contrast, from Tables 1 and 5, the sheet packages (Comparative Examples 6 to 10) containing a double sheet (sheet laminate) in the pillow packaging bags made of Materials 1 to 3 with the stitch ratio of the packaging bags being 65% or 100% had at least one of poor initial extractability, pop-up property, non-falling property, and standing property. Note that the sheet package (Comparative Example 11) containing a double sheet (sheet laminate) in the pillow packaging bag made of Material 5 with the stitch ratio of the packaging bag being 100% was formed only of resin as the material of the pillow packaging bag.

[0168] From these results, a pillow packaging bag having a paper layer containing a paper component and a resin layer containing a thermoplastic resin provided on at least one surface of the paper layer, with the ratio of the paper component being 50% or more, has an outlet formed in the longitudinal direction of the pillow packaging bag on the upper surface thereof. The length of the outlet with respect to the distance between a pair of seal portions in the longitudinal direction of the upper surface is 80% or more and 100% or less when the ply number of the accommodated sheet is 1 ply, and 70% or more and 90% or less when the ply number of the sheet is 2 plies or more. It was found that the sheet package, in which the packaging bag is a paper-made sheet package, is excellent in taking out the sheet.

[0169] As described above, the embodiments of the present invention have been explained. However, the present invention is not limited to specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims.

Explanation of Reference Numerals

[0170] 100 Sheet package 10 Packaging bag 10A Paper layer 10B, 10C Resin layer 11 Upper surface 12 Lower surface 13, 14 Side surface 15, 16 Gable surface 20 Sheet laminate S Sheet 30 Cracking cut line (outlet) M Stitch C Cut T Tie D1, D2 Length OP Opening (outlet) 40, 50 Seal portion (end seal) 60 Seal portion (bottom seal) 90 Instrument 91 Needle portion 91A Tip 92 Base portion 92A Receiving groove L1, L2, L3 Length W1, W2 Width H1, H2 Height R1 and R2 regions

Claims

1. A pillow packaging bag that houses a plurality of stacked sheets and has a pair of seal portions at both longitudinal ends, and an outlet formed on the upper surface of the pillow packaging bag and extending in the longitudinal direction of the pillow packaging bag. The pillow packaging bag, has a paper layer containing a paper component, and a resin layer containing a thermoplastic resin provided on at least one surface of the paper layer, wherein the ratio of the paper component is 50% or more, the thickness of the resin layer is 9 μm or more and 30 μm or less, The basis weight of the pillow packaging bag is 30 g / m ２ or more and 60 g / m ２ or less, and the thickness of the pillow packaging bag is 45 μm or more and 80 μm or less, when the ply number of the sheet is 1 ply, the length of the outlet is 80% or more and 100% or less with respect to the distance between the pair of seal portions in the longitudinal direction when the pillow packaging bag is viewed from the upper surface side, when the ply number of the sheet is 2 plies or more, the length of the outlet is 70% or more and 90% or less with respect to the distance between the pair of seal portions in the longitudinal direction when the pillow packaging bag is viewed from the upper surface side, The Clark stiffness in the longitudinal direction of the pillow packaging bag is 3 cm ３ / 100 or more and 20 cm ３ / 100 or less, and the longitudinal tear strength of the pillow packaging bag is 90 mN or more and 330 mN or less, and the longitudinal elongation of the pillow packaging bag is 2.7% or more and 3.8% or less. A sheet packaging body.

2. The basis weight of the paper layer is 10 g / m ２ or more and 40 g / m ２ or less, The sheet packaging body according to Claim 1.

3. The paper layer is formed of kraft paper or rayon paper, The sheet packaging body according to Claim 1 or 2.

4. The thermoplastic resin is low-density polyethylene, The sheet packaging body according to any one of Claims 1 to 3.

5. The ply number of the sheet is 1 ply, The basis weight of the sheet is 5 g / m ２ or more and 80 g / m ２ or less. The sheet packaging body according to any one of Claims 1 to 4.

6. The sheet, has a longitudinal softness of 50 mN / 100 mm or more and 350 mN / 100 mm or less, and a lateral softness of 20 mN / 100 mm or more and 320 mN / 100 mm or less, The sheet packaging body according to Claim 5.

7. The ply number of the sheet is 2 plies, The basis weight of the sheet is 1 g / m² or more and 50 g / m² or less per ply. ２ ２ ​ The sheet packaging body according to any one of Claims 1 to 4.

8. The sheet, has a longitudinal softness of 15 mN / 100 mm or more and 45 mN / 100 mm or less, and a lateral softness of 10 mN / 100 mm or more and 40 mN / 100 mm or less, The sheet packaging body according to Claim 7.

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