Sheet packaging

Abstract

To provide a sheet package that allows a take-out port to be easily formed even when a packaging bag is made from paper.SOLUTION: A sheet package includes: a package bag that stores stacked multiple pieces of sheets; and a tear-opening cut line that is formed on the top face of the package bag and forms a take-put port of the sheets on the top face when torn open. The package bag is formed of a substrate that includes paper material, and the substrate includes a base layer that includes the paper material and a resin layer that is provided on at least one face of the substrate layer and includes thermoplastic resin. The tear-opening cut line is formed of pairs of cuts that are opposite to each other in a width direction of the top face, which are juxtaposed at predetermined intervals in a longer direction of the top face that is orthogonal to the width direction. Each cut that forms the one pair of cuts includes a base part that extends in the longer direction and a branch part that continues to at least one of the ends of the base part and extends toward the opposite cut in the width direction from the one end.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sheet packaging body. [Background technology]

[0002] Sheet packages containing sheets such as paper towels and tissue paper are distributed and used with multiple sheets contained in a packaging bag made of resin film (for example, Patent Documents 1 and 2). In recent years, from the perspective of reducing environmental impacts such as global warming due to CO2 emissions and marine pollution caused by microplastics, attention has been focused on changing the material of the packaging bags in sheet packages from resin to paper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-183034 [Patent Document 2] Japanese Patent Application Publication No. 2018-177364 Summary of the Invention [Problem to be solved by the invention]

[0004] However, paper packaging bags are less flexible than plastic packaging bags, so when perforations are provided on the top surface for opening to form an access opening, the perforations are difficult to tear and the access opening is difficult to form.

[0005] An object of the present invention is to provide a sheet packaging body in which an access opening can be easily formed even when the packaging bag is made of paper. [Means for solving the problem]

[0006] A first aspect of the present invention provides a sheet packaging body having a packaging bag that contains multiple stacked sheets and a tear score line provided on a top surface of the packaging bag that forms an opening for removing the sheets on the top surface when the bag is torn, wherein the packaging bag is made of a substrate that contains a paper component, and the substrate includes a base layer that contains the paper component and a resin layer that contains a thermoplastic resin and is provided on at least one surface of the base layer, and the tear score line comprises a pair of cuts that face each other in the width direction of the top surface and are arranged at a predetermined interval in the longitudinal direction of the top surface that is perpendicular to the width direction, and each cut that constitutes the pair of cuts includes a base extending in the longitudinal direction and a branch portion that is continuous with at least one end of the base and extends from the one end toward the cut that faces each other in the width direction.

[0007] In this specification, the paper component refers to agglutinated plant fibers. The resin layer provided on at least one side of the base layer refers to either a structure in which a resin layer is provided on one side of the base layer (two-layer structure) or a structure in which resin layers are laminated on both sides of the paper layer (three-layer structure). The tearing score line refers to a score line (e.g., perforation) in which cuts and ties (uncut portions between two cuts) are arranged alternately, and when a tie is broken, the adjacent cuts on both sides become continuous cuts.

[0008] In the first aspect, the cut that forms the tearing score line for forming an access opening on the top surface of a packaging bag made of a base material containing a paper component includes a base extending in the longitudinal direction and a branch extending from one end of the base toward the opposite cut in the width direction, thereby forming an approximately L-shaped cut.

[0009] In this manner, the sheet can be torn from one end of the tear score line to the other end by tearing along the longitudinal direction from one end of the base where the branch portions are continuous. Therefore, according to the first aspect, even if the packaging bag constituting the sheet packaging body is made of paper, the tear score line for forming the access opening on the top surface of the packaging bag can be easily torn, making it easy to form the access opening.

[0010] A second aspect of the present invention provides a sheet packaging body, wherein the branch portions extend in a direction perpendicular to the base portion. In this specification, "the branch portions are perpendicular to the base portion" means that the angle between the extending direction of the base portion and the extending direction of the branch portions intersects at 90 degrees.

[0011] In the second embodiment, the branch extends in a direction perpendicular to the base, forming an L-shaped cut. In a splitting score line including such a cut, the branch splits along the longitudinal direction from one end of the base where the branch is continuous, allowing for a clean split from one end of the splitting score line to the other end.

[0012] A third aspect of the present invention provides a sheet packaging body, wherein the branch portions extend in a direction such that the angle between the branch portion and the base portion is an obtuse angle. In this specification, "the angle between the branch portion and the base portion is an obtuse angle" means that the angle between the extending direction of the base portion and the extending direction of the branch portion intersects with each other at an angle greater than 90 degrees.

[0013] In the third embodiment, the branch extends in a direction where the angle between the branch and the base is obtuse, forming a modified L-shaped cut in which the branch is inclined away from the base. In a splitting score line including such a cut, the branch splits along the longitudinal direction from one end of the base where the branch is continuous, allowing for a clean split from one end of the splitting score line to the other end.

[0014] A fourth aspect of the present invention provides a sheet packaging body, wherein the branch portions extend in a direction such that the angle between the branch portion and the base portion is an acute angle. In this specification, "the angle between the branch portion and the base portion is an acute angle" means that the angle between the extending direction of the base portion and the extending direction of the branch portion intersects with each other at an angle of less than 90 degrees.

[0015] In a fourth embodiment, the branch extends in a direction in which the angle between the branch and the base is an acute angle, thereby forming a modified L-shaped cut in which the branch is inclined toward the base. In a splitting score line including such a cut, splitting can be performed from one end of the splitting score line to the other end in both cases where the branch splits along the longitudinal direction from one end of the base where the branch is continuous, and where the branch splits along the longitudinal direction from the other end of the base where the branch is not continuous.

[0016] A fifth aspect of the present invention provides a sheet packaging body, wherein the cut includes a first branch portion that is continuous with one end of the base and extends from the one end toward the opposite cut in the width direction, and a second branch portion that is continuous with the other end of the base and extends from the other end toward the opposite cut in the width direction.

[0017] In a fifth aspect, the cut includes a first branch portion extending continuously from one end of the base toward the opposite cut in the width direction, and a second branch portion extending continuously from the other end of the base toward the opposite cut in the width direction, thereby forming a channel-shaped cut.

[0018] With such a tear score line, the sheet can be torn from one end to the other end of the tear score line when the first branch portion is torn along the longitudinal direction from one end of the base portion to which the first branch portion is continuous, and when the second branch portion is torn along the longitudinal direction from the other end of the base portion to which the second branch portion is continuous. Therefore, according to the fifth aspect, even when the packaging bag constituting the sheet packaging body is made of paper, the tear score line for forming the access opening on the top surface of the packaging bag can be easily torn, making it easy to form the access opening.

[0019] A sixth aspect of the present invention provides a sheet packaging body in which the first branch portion and the second branch portion extend parallel to each other. In the sixth aspect, the first branch portion and the second branch portion extend parallel to each other, so that in two longitudinally adjacent cuts, the second branch portion of one cut and the first branch portion of the other cut are aligned parallel to each other in the longitudinal direction.

[0020] With such a cutting line for splitting, when the first branch portion splits along the longitudinal direction from one end side of the continuous base portion, and when the second branch portion splits along the longitudinal direction from the other end side of the continuous base portion, the splitting line can be performed cleanly from one end to the other end. [Effects of the Invention]

[0021] According to one aspect of the present invention, it is possible to provide a sheet packaging body in which an access opening can be easily formed even when the packaging bag is made of paper. [Brief explanation of the drawings]

[0022] [Figure 1] 1A and 1B are diagrams showing a sheet wrapping body according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing a sheet contained in a packaging bag. [Figure 3] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the top side. FIG. [Figure 4] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the bottom side. FIG. [Figure 5] 2 is a front view of the sheet wrapping body of FIG. 1. FIG. [Figure 6] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the rear side. FIG. [Figure 7] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the left side. FIG. [Figure 8] 2 is a view of the sheet wrapping body of FIG. 1 as seen from the right side. FIG. [Figure 9] FIG. 2 is a diagram showing an example of a cross section of a base material of a packaging bag. [Figure 10] FIG. 4 is an enlarged view of a region R1 in FIG. 3. [Figure 11] FIG. 11 is an enlarged view of region R2 in FIG. [Figure 12] 10 is a diagram showing a state in which the packaging bag of the sheet packaging body is opened and an access opening is opened on the top surface of the packaging bag. FIG. [Figure 13] 10A and 10B are diagrams showing a state in which the sheet wrapping body is used. [Figure 14] 11 is a view showing a sheet wrapping body of a second embodiment (a view corresponding to FIG. 10). FIG. [Figure 15] 15 is an enlarged view of a region R2 in FIG. 14 (a view corresponding to FIG. 11). [Figure 16] 11 is a view showing a sheet wrapping body of a third embodiment (a view corresponding to FIG. 10). FIG. [Figure 17] 17 is an enlarged view of a region R2 in FIG. 16 (a view corresponding to FIG. 11). [Figure 18] 10 is a diagram showing a sheet wrapping body according to a fourth embodiment (corresponding to FIG. 10). FIG. [Figure 19] 19 is an enlarged view of a region R2 in FIG. 18 (a view corresponding to FIG. 11). [Figure 20] 10 is a diagram showing a sheet wrapping body according to a fifth embodiment (corresponding to FIG. 10). FIG. [Figure 21] 21 is an enlarged view of a region R2 in FIG. 20 (corresponding to FIG. 11). DETAILED DESCRIPTION OF THE INVENTION

[0023] An embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, common parts are given the same reference numerals and their description may be omitted. Also, in each drawing, the scale of each part may differ from the actual scale. In each drawing, a three-dimensional Cartesian coordinate system with three axial directions (X direction, Y direction, and Z direction) is used, with the longitudinal direction of the packaging bag being the X direction, the width direction being the Y direction, and the height direction (vertical direction or thickness direction) being the Z direction.

[0024] First Embodiment Fig. 1 is a diagram showing a sheet packaging body of a first embodiment. Fig. 2 is a diagram showing a sheet contained in a packaging bag of the embodiment. Figs. 3, 4, 5, 6, 7, and 8 are views of the sheet packaging body of Fig. 1 as seen from the top, bottom, front, back, left side, and right side, respectively. Fig. 9 is a diagram showing an example of a cross section of a base material of a packaging bag. Fig. 10 is an enlarged view of region R1 of Fig. 3, and Fig. 11 is an enlarged view of region R2 of Fig. 10.

[0025] As shown in FIG. 1, the sheet packaging body 100 has a packaging bag 10 and a sheet stack 20 (plurality of sheets S). The sheet packaging body 100 is an example of a sheet packaging body according to this embodiment. The packaging bag 10 is an example of a packaging bag constituting the sheet packaging body according to this embodiment. The sheet stack 20 is an example of a sheet contained in the packaging bag according to this embodiment.

[0026] As shown in Fig. 2, the packaging bag 10 contains a plurality of stacked sheets (or a plurality of sets of sheets S) (a sheet stack 20). The sheet stack 20 is contained in the packaging bag 10 so that the stacking direction (SD direction) of the sheets S is the height direction (Z direction). The sheet stack 20 is designed so that the sheets S can be pulled out one set at a time through a take-out opening 30 (opening OP) (described later) formed in the packaging bag 10 (see Figs. 12 and 13).

[0027] The form of the sheet stack 20 is not particularly limited, and may be, for example, a stack of sheets S in a folded state, a stack of sheets S in a folded state and stacked alternately (a so-called pop-up type sheet stack), or a stack of multiple sheets S simply stacked.

[0028] 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 250 mm, the width W2 in the width direction (Y direction) perpendicular 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 (see Figures 2 and 3). Such a tissue paper laminate can be produced, for example, by a rotary or multi-stand interfolder.

[0029] The form of the sheet S is not particularly limited, and it can be applied to, for example, sanitary thin papers such as paper towels, kitchen paper, tissue paper, toilet paper, etc. These sanitary thin papers also include sanitary thin papers containing moisturizing ingredients (for example, lotion tissue, etc.).

[0030] The use of the sheet S is not particularly limited, and it can be used for industrial, home, or portable purposes. Among these, household and portable paper towels are preferably used as the sheet in this embodiment.

[0031] The number of plies of the sheet S is not particularly limited, but can be one or more, and is preferably one or two (two layers stacked together). The shape of the sheet S is also not particularly limited, but it is preferable that the outline shape of the two-ply sheet when folded is quadrangular (rectangle, square, etc.).

[0032] The material of the sheet S is not particularly limited, but may be, for example, a sheet of paper, nonwoven fabric, or cloth, and is preferably paper (paper sheet). When the sheet S is a paper sheet, base paper containing pulp as the main raw material is used. The pulp composition may be any known composition for paper sheets. For example, the pulp content may be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0033] The pulp composition of the sheet S (paper sheet) is not particularly limited. For example, softwood pulp such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp) can be used in any ratio.

[0034] In the sheet S (paper sheet), 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. Furthermore, recycled paper pulp may be used as the pulp contained in the sheet S (paper sheet).

[0035] The basis weight of the sheet S is not particularly limited, but in the case of paper, it is 5 g / m depending on the number of plies. 2 More than 80g / m 2 and preferably 10 g / m 2More than 60g / m 2 Less than 10 g / m, more preferably 2 More than 45g / m 2 In the case of nonwoven fabric, the density is 20 g / m 2 More than 100g / m 2 The following is desirable: Basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0036] The thickness of the sheet S (paper sheet) is not particularly limited, and can be the paper thickness measured under the environment of JIS P 8111 (1998). For example, when the sheet S is paper, the paper thickness is 50 μm or more and 600 μm or less, preferably 60 μm or more and 500 μm or less, and more preferably 130 μm or more and 400 μm or less per two plies.

[0037] The sheet S (paper sheet) may be embossed by a known embossing method.

[0038] The shape of the packaging bag 10 is not particularly limited. In this embodiment, the packaging bag 10 has a top surface 11, a bottom surface 12, side surfaces 13 and 14, end surfaces 15 and 16. In the packaging bag 10, the top surface 11 and the bottom 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 end surfaces 15 and 16 face each other in the longitudinal direction (X direction). In addition, the end surfaces 15 and 16 are continuous with all of the top surface 11, bottom surface 12, side surfaces 13, and side surfaces 14 (FIGS. 1, 3 to 8).

[0039] The dimensions of the packaging bag 10 are not particularly limited. For example, the length L1 of the packaging bag 10 in the longitudinal direction (X direction) can be about 150 to 250 mm, the width W1 in the width direction (Y direction) perpendicular 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 (FIGS. 1 and 3). The dimensions of the packaging bag 10 refer to the dimensions when the sheet laminate 20 is housed in the packaging bag 10 (FIGS. 1 and 2).

[0040] A take-out opening 30 extending in the longitudinal direction (X direction) of the packaging bag 10 is formed on the top surface 11, the top surface 11 side of the end surface 15, and the top surface 11 side of the end surface 16 of the packaging bag 10. Specifically, the take-out opening 30 is configured with a tear-open score line M. The tear-open score line M is a score line (perforation) in which cuts C and ties T (two cuts C and the uncut portion between C) are arranged alternately, and when a tie T is broken, the cuts C on both sides become continuous cuts (FIGS. 1, 3, 10, 11).

[0041] In this embodiment, the tearing score line M forms a linear perforation M in which cuts C and ties T are arranged alternately (FIGS. 1, 3, 10, and 11). In the packaging bag 10, tearing along this tearing score line (perforation) M forms an outlet 30 (opening OP) through which the sheet S is pulled out on the top surface 11 of the packaging bag 10 (FIGS. 1 and 12). The tearing score line M is an example of a tearing score line in the sheet packaging body of this embodiment.

[0042] The length L3 of the outlet 30 is not particularly limited, but is, for example, 90 mm to 250 mm, preferably 100 mm to 250 mm, and more preferably 110 mm to 250 mm (FIG. 3). The length L3 of the outlet 30 can be, at its longest, the length from the vicinity of the top surface 11 side of the seal portion 40 on the end surface 15 through the top surface 11 to the vicinity of the top surface 11 side of the seal portion 50 on the end surface 16, and is preferably the same length as the length L1 of the packaging bag 10.

[0043] The width W3 of the outlet 30 is not particularly limited, but is preferably adjusted to a dimension that allows the sheet S to pass through but is less likely to fall in (FIG. 3). The width W3 of the outlet 30 is, for example, 1 mm or more and 20 mm or less, preferably 3 mm or more and 15 mm or less, and more preferably 5 mm or more and 10 mm or less.

[0044] The tearing score line M may be formed by any method. For example, although not shown, the base material BS of the packaging bag 10, which will be described later, may be placed between the needle and the base, and the tip of the needle may be inserted into the receiving groove of the base, thereby forming the tearing score line M.

[0045] The packaging bag 10 may have ventilation holes (not shown). The ventilation holes can function as air holes for the packaging bag 10. The positions of the ventilation holes are not particularly limited, and in this embodiment, ventilation holes can be provided on the side surfaces 13, 14, and end surfaces 15 and 16 of the packaging bag 10. The number of ventilation holes is not limited. The shape of the ventilation holes is not limited, and for example, they are circular in plan view. Furthermore, the dimensions of the ventilation holes are not limited, and for example, they have a diameter of about 2 mm.

[0046] The method for forming the ventilation hole is arbitrary, and for example, the ventilation hole can be formed by placing the base material BS of the packaging bag 10 between the needle and the base, and inserting the tip of the needle into the receiving groove of the base, in the same way as the above-mentioned tearing score line M. When forming the ventilation hole, a base without a receiving groove may be used.

[0047] By providing such ventilation holes in the packaging bag 10, the packaging bag is less likely to burst when the sheet wrapping body 100 is stored or transported.

[0048] The packaging form of the packaging bag 10 is not particularly limited, and may be, for example, a pillow packaging bag in which the base material BS of the packaging bag 10 is processed into a cylindrical shape and the open end of the cylindrical base material BS is sealed, a caramel packaging bag in which both end portions of a cylindrical sheet for the packaging bag 10 are folded and sealed, or a combination of these. In the case of a pillow packaging bag, the cylindrical base material BS may be folded in a gusset shape.

[0049] In this embodiment, the packaging bag 10 is configured as a pillow packaging bag having at least one seal part. Specifically, seal parts (end seals) 40, 50 are formed on end surfaces 15, 16 of the packaging bag 10, and a seal part (bottom seal) 60 is formed on the bottom surface 12 of the packaging bag 10, and the sheet S (sheet stack 20) ​​is pillow packaged.

[0050] In this embodiment, packaging bag 10 is a pillow packaging bag, and the resin layers can be bonded together by heat-sealing at least one seal portion with inner layer (resin layer) 10B disposed inside packaging bag 10. This makes it possible to effectively utilize the adhesive function of inner layer (resin layer) 10B, thereby obtaining packaging bag 10 with high sealing properties.

[0051] In the packaging bag 10 of this embodiment, the seal portions 40, 50, and 60 are heat-sealed. Here, heat-sealing refers to heating a part of the base material BS to weld parts of the packaging bag sheet together. Specifically, in a state where an inner layer (resin layer) 10B of the substrate BS, which will be described later, is placed inside the packaging bag 10, the seal portions 40, 50, 60 are heat-sealed.

[0052] In the packaging bag 10, the joining pitch of the seal portion 40, the joining pitch of the seal portion 50, and the joining pitch of the seal portion 60 are each preferably 0.5 mm or more and 2 mm or less, more preferably 0.8 mm or more and 1.8 mm or less, and even more preferably 1.0 mm or more and 1.5 mm or less.

[0053] Here, the joining pitch indicates the spacing in a predetermined direction (the width direction (Y direction) of the packaging bag 10 for the seal portions 40, 50, 60, and the longitudinal direction (X direction) of the packaging bag 10 for the seal portion 60) of the parts (not shown) that are convexly bonded when viewed from one side of the seal portions 40, 50, 60 (for example, the bottom surface 12 side of the packaging bag 10).

[0054] In this embodiment, as described above, by setting the joining pitch of the seal portions (seal portions 40, 50, 60) to 0.5 mm or more and 2 mm or less, the adhesive function of the inner layer (resin layer 10B) provided on the base layer (paper layer) 10A can be improved, and a packaging bag 10 (pillow packaging bag) with better sealing properties can be obtained.

[0055] The packaging bag 10 has a base material BS containing a paper component. Here, the paper component is made by agglutinating plant fibers (pulp). The pulp composition of the paper component is not limited, and for example, the ratio of hardwood pulp to softwood pulp is 0:100 to 70:30, and preferably the ratio of softwood pulp to hardwood pulp is higher. Furthermore, recycled paper pulp may be used as the pulp.

[0056] The substrate BS that constitutes the packaging bag 10 is composed of a base layer 10A, an inner layer 10B, and an outer layer 10C. The substrate BS has a three-layer structure in which the inner layer 10B and the outer layer 10C are laminated on each side of the paper layer 10A (FIG. 9).

[0057] The base layer 10A constitutes the base of the substrate BS and also constitutes a paper layer containing the above-mentioned paper components.

[0058] The material of the paper component contained in the base layer (paper layer) 10A is not particularly limited, but it can be made of, for example, kraft paper or rayon paper.

[0059] Here, kraft paper is paper made from kraft pulp. Rayon paper is made by blending rayon fiber, which is chemically synthesized from wood pulp, with kraft pulp. From the perspective of achieving both softness and strength in the packaging bag 10, it is preferable that the rayon fiber content of the rayon paper be 20% or less by mass.

[0060] The basis weight of the base layer (paper layer) 10A is not limited, but is preferably 10 g / m 2 More than 70g / m 2 or less, more preferably 15 g / m 2 More than 60g / m 2 More preferably, 20 g / m or less 2 More than 50g / m 2 The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0061] The thickness of the base layer (paper layer) 10A is not limited, but is preferably 20 μm to 300 μm, more preferably 30 μm to 200 μm, and even more preferably 40 μm to 180 μm, as measured in accordance with JIS P 8118 (2014).

[0062] The tensile strength of the base layer (paper layer) 10A is not limited, but is, for example, 500 cN / m or more and 20,000 cN / m or less in the longitudinal direction of the fibers (machine direction or MD direction), preferably 1,000 cN / m or more and 15,000 cN / m or less, and more preferably 1,500 cN / m or more and 12,000 cN / m or less.

[0063] The tensile strength in the cross direction (the direction perpendicular to the machine direction or CD) of the fibers is 100 cN / m or more and 10,000 cN / m or less, preferably 300 cN / m or more and 5,000 cN / m or less, and more preferably 500 cN / m or more and 2,500 cN / m or less. The tensile strength is measured in accordance with the provisions of JIS P 8113 (2006).

[0064] The elongation of the base layer (paper layer) 10A is not limited, but is, for example, 0.5% to 30% in the machine direction (MD), preferably 1% to 25%, and more preferably 2% to 20%. The elongation in the cross direction (CD) is 0.5% to 20%, 1% to 10%, or 2% to 5%. The elongation is measured in accordance with JIS P 8113 (2006).

[0065] The tear strength of the base layer (paper layer) 10A is not limited, but is, for example, 50 mN to 500 mN in the machine direction (MD) of the fibers, preferably 80 mN to 480 mN, and more preferably 100 mN to 450 mN.

[0066] The tear strength in the cross direction (CD) of the fibers is 200 mN or more and 1000 mN or less, preferably 250 mN or more and 900 mN or less, and more preferably 300 mN or more and 800 mN or less. The tear strength is measured in accordance with the provisions of JIS P 8116 (2000).

[0067] The inner layer 10B is provided on either side of the paper layer 10A and constitutes a resin layer containing a thermoplastic resin. The inner layer (resin layer) 10B constitutes the inner surface IS of the base material BS that is placed inside the packaging bag 10. The inner surface IS of the base material BS that is placed inside the packaging bag 10 constitutes the surface that comes into contact with the sheet S contained in the packaging bag 10.

[0068] The thermoplastic resin material contained in the inner layer (resin layer) 10B is not particularly limited, but is preferably low-density polyethylene, which may be either high-pressure low-density polyethylene (LDPE) or linear low-density polyethylene (L-LDPE).

[0069] In this embodiment, by using low-density polyethylene as the thermoplastic resin contained in the inner layer (resin layer) 10B, the stiffness of the packaging bag 10 can be further reduced while improving the adhesive function of the inner layer (resin layer) 10B when sealing the packaging bag 10.

[0070] The thickness of the inner layer (resin layer) 10B is not limited, but is preferably 5 μm to 40 μm, more preferably 7 μm to 35 μm, and even more preferably 9 μm to 30 μm. The paper thickness is measured in accordance with the provisions of JIS P 8118 (2014).

[0071] In this embodiment, by setting the thickness of the inner layer (resin layer) 10B to 5 μm or more and 40 μm or less, it becomes easier to maintain the ratio of paper components in the packaging bag at 50% or more. Also, the adhesive function of the inner layer (resin layer) 10B when sealing the packaging bag can be maintained while suppressing the stiffness of the packaging bag.

[0072] The thermoplastic resin contained in the inner layer (resin layer) 10B contains a slip agent. The slip agent is an agent that reduces the coefficient of friction of the surface (inner surface) of the inner layer 10B. In this embodiment, the slip agent is added to the thermoplastic resin contained in the inner layer (resin layer) 10B, but it may also be applied to the inner surface IS of the substrate BS.

[0073] The components of the slip agent are not particularly limited, but for example, ethylene homopolymer, fatty acid amide, vegetable oil, etc. can be used as the main component. The content of the slip agent relative to the thermoplastic resin is not particularly limited. In addition to the main component, the slip agent may also contain additives for purposes such as maintaining the stability of the slip agent.

[0074] The outer layer (printed layer) 10C is provided on either side of the paper layer 10A and constitutes a printed layer that is printed on the surface of the packaging bag. The outer layer (printed layer) 10C constitutes the outer surface OS of the base material BS that is placed on the outside of the packaging bag 10. The outer surface OS of the base material BS that is placed on the outside of the packaging bag 10 constitutes the surface on the side that does not come into contact with the sheet S contained in the packaging bag 10.

[0075] The outer layer (printed layer) 10C contains a gripping agent. Here, the gripping agent is an agent that increases the coefficient of friction of the surface (outer surface) of the outer layer 10C. In this embodiment, the gripping agent is applied to the outer surface OS of the base material BS, but may also be contained in the outer layer (printed layer) 10C.

[0076] The components of the gripping agent are not particularly limited, but for example, medium ink (synthetic resin), oil-based varnish, etc. can be used as the main component. The amount of gripping agent used relative to the outer layer (printed layer) 10C is not particularly limited. In addition to the main component, the gripping agent may also contain auxiliary agents and solvents depending on the purpose, such as maintaining the stability of the gripping agent.

[0077] As described above, in packaging bag 10 of this embodiment, inner layer (resin layer) 10B containing a thermoplastic resin is provided on either side of base layer (paper layer) 10A containing a paper component, which softens the texture of packaging bag 10. This reduces the stiffness of packaging bag 10 and provides conformability to packaging bag 10. Therefore, even if the material of the packaging bag is changed from resin to paper, it is possible to provide packaging bag 10 that is less likely to break during manufacturing or transportation.

[0078] In this embodiment, the ratio of paper components in the packaging bag 10 (substrate BS) is 50% or more. In this embodiment, since the ratio of paper components in the packaging bag 10 is 50% or more, the environmental load can be reduced.

[0079] The basis weight of the packaging bag 10 (substrate BS) is not limited, but is preferably 20 g / m 2 More than 100g / m 2 or less, more preferably 25 g / m 2 More than 70g / m 2 or less, more preferably 30 g / m 2 More than 60g / m 2 The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0080] The thickness (paper thickness) of the packaging bag 10 (substrate BS) is not limited, but is, for example, 25 μm to 350 μm, preferably 30 μm to 250 μm, and more preferably 45 μm to 200 μm. The thickness may be measured in accordance with the JIS P 8118 (2014) standard.

[0081] The tensile strength of the packaging bag 10 (substrate BS) is not limited, but is, for example, 1000 cN / m or more and 20000 cN / m or less in the longitudinal direction of the fibers (MD direction), preferably 1500 cN / m or more and 18000 cN / m or less, and more preferably 2000 cN / m or more and 15000 cN / m or less.

[0082] The tensile strength in the cross direction (CD) of the fibers is 500 cN / m or more and 10,000 cN / m or less, preferably 1,000 cN / m or more and 8,000 cN / m or less, and more preferably 1,500 cN / m or more and 5,000 cN / m or less. The tensile strength is measured in accordance with the provisions of JIS P 8113 (2006).

[0083] The elongation of the packaging bag 10 is not limited, but is, for example, 0.5% to 30% in the machine direction (MD) of the fibers, preferably 1% to 25% in the machine direction, and more preferably 2% to 20% in the cross direction (CD). The elongation is measured in accordance with JIS P 8113 (2006).

[0084] The tear strength of the packaging bag 10 is not limited, but is, for example, 50 mN to 500 mN in the machine direction (MD) of the fibers, preferably 80 mN to 450 mN, and more preferably 100 mN to 400 mN.

[0085] The tear strength in the cross direction (CD) of the fibers is 200 mN or more and 1000 mN or less, preferably 250 mN or more and 900 mN or less, and more preferably 300 mN or more and 800 mN or less. The tear strength is measured in accordance with the provisions of JIS P 8116 (2000).

[0086] The Taber stiffness of the packaging bag 10 is not limited, but is, for example, 0.01 mN / m or more and 0.2 mN / m or less in the longitudinal direction of the fibers (MD direction), preferably 0.02 mN / m or more and 0.17 mN / m or less, and more preferably 0.03 mN / m or more and 0.15 mN / m or less.

[0087] The stiffness in the cross direction (CD) of the fibers is 0.001 mN / m or more and 0.1 mN / m or less, preferably 0.01 mN / m or more and 0.08 mN / m or less, and more preferably 0.02 mN / m or more and 0.07 mN / m or less. The Taber stiffness is measured in accordance with the provisions of JIS P 8125 (2000).

[0088] In the sheet packaging body 100 of this embodiment, the tearing score line M is configured such that a pair of cuts C1, C2 facing each other in the width direction (Y direction) of the top surface 11 are lined up at a predetermined interval B1 in the longitudinal direction (X direction) of the top surface 11, which is perpendicular to the width direction (Y direction). In other words, two cuts C adjacent to each other in the longitudinal direction (X direction) of the top surface 11 are arranged at a predetermined interval B1.

[0089] The predetermined distance B1 between two adjacent cuts C in the longitudinal direction (X direction) corresponds to the sum of the length B2 of the base of the cut C described below and the distance B3 (the length of ties T1, T2) between one end of the base of the cut C and the other end of the base of another cut C adjacent to it in the longitudinal direction (X direction).

[0090] The predetermined distance B1 between two adjacent cuts C in the longitudinal direction (X direction) is not particularly limited, but is, for example, preferably 1 mm or more and 15 mm or less, more preferably 1.5 mm or more and 13 mm or less, and more preferably 2 mm or more and 10 mm or less.

[0091] The cut C1 arranged on the side surface 13 of the top surface 11 forms the edge 31 on the side surface 13 side of the outlet 30 when the tearing score line M is torn. Also, the cut C2 arranged on the side surface 14 side of the top surface 11 forms the edge 32 on the side surface 14 side of the outlet 30 when the tearing score line M is torn (Figs. 3, 10, 11).

[0092] Of the cuts constituting the pair of cuts C1 and C2, cut C1 includes a base C11 extending in the longitudinal direction (X direction) and a branch C12 continuing from one of both ends of base C11 and extending from that end toward the opposing cut C2 in the width direction (Y direction). Cut C2 also includes a base C21 extending in the longitudinal direction (X direction) and a branch C22 continuing from one of both ends of base C21 and extending from that end toward the opposing cut C1 in the width direction (Y direction).

[0093] Here, one end of each of the base portions C11 and C21 indicates the end of the base portions C11 and C21 located on the end surface 15 side of the packaging bag 10 (FIGS. 3, 10, and 11). In addition, the other end of each of the base portions C11 and C21, which will be described later, indicates the end of the base portions C11 and C21 located on the end surface 16 side of the packaging bag 10 (FIGS. 3, 10, and 11).

[0094] In the cut C1, the length B2 of the base C11 is arbitrary but may be, for example, 0.5 mm to 10 mm, preferably 0.7 mm to 8 mm, and more preferably 1 mm to 6 mm. In the cut C2, the length B2 of the base C21 is arbitrary but may be, for example, 0.5 mm to 10 mm, preferably 0.7 mm to 8 mm, and more preferably 1 mm to 6 mm.

[0095] The distance B3 between one end of the base C11 of a cut C1 and the other end of the base C11 of another cut C1 adjacent to it in the longitudinal direction (X direction) corresponds to the length of the tie T1 between the adjacent cuts C1. Also, the distance B3 between one end of the base C21 of a cut C2 and the other end of the base C21 of another cut C2 adjacent to it in the longitudinal direction (X direction) corresponds to the length of the tie T2 between the adjacent cuts C2 (FIG. 11).

[0096] In the cuts C1 and C2, the interval B3 is not particularly limited, but is, for example, preferably 0.3 mm or more and 5 mm or less, more preferably 0.5 mm or more and 4 mm or less, and more preferably 1 mm or more and 3 mm or less.

[0097] In cut C1, the ratio of tie T1 to cut C1 is arbitrary but can be, for example, 5:1 to 1:7, preferably 3:1 to 1:5, more preferably 2:1 to 1:3. In cut C2, the ratio of tie T2 to cut C2 is arbitrary but can be, for example, 5:1 to 1:7, preferably 3:1 to 1:5, more preferably 2:1 to 1:3.

[0098] In a pair of cuts C1 and C2 facing each other in the width direction (Y direction), the distance D1 between the base C11 of the cut C1 and the base C21 of the cut C2 is not particularly limited, but is preferably adjusted to the dimension of the width W3 of the outlet 30. In the pair of cuts C1 and C2, the distance D1 between the base C11 and the base C12 is, for example, 1 mm or more and 20 mm or less, preferably 3 mm or more and 15 mm or less, and more preferably 5 mm or more and 10 mm or less.

[0099] In the cut C1, the length D2 of the branch C12 is arbitrary, but is, for example, 0.1 mm to 5 mm, preferably 0.3 mm to 3 mm, and more preferably 0.5 mm to 2 mm. In the cut C2, the length D2 of the branch C22 is arbitrary, but is, for example, 0.1 mm to 5 mm, preferably 0.3 mm to 3 mm, and more preferably 0.5 mm to 2 mm.

[0100] In a pair of cuts C1 and C2 facing each other in the width direction (Y direction), the distance D3 between the branch C12 of cut C1 and the branch C22 of cut C2 is not particularly limited, but is preferably adjusted to a dimension that allows the tearing score line M that forms the outlet 30 (opening OP) to tear. The distance D3 between the branches C22 is, for example, 1 mm or more and 4.5 mm or less, preferably 2 mm or more and 4.3 mm or less, and more preferably 3 mm or more and 4 mm or less.

[0101] In this embodiment, the cuts C (cuts C1, C2) that form the tearing score line M for forming an outlet 30 on the top surface 11 of the packaging bag 10 made of a base material BS containing a paper component include base portions C11, C21 extending in the longitudinal direction (X direction) and branch portions C12, C22 extending from one end of the base portions C11, C21 toward the opposite cut C (cuts C2, C1) in the width direction (Y direction), thereby giving the cuts C (cuts C1, C2) an approximately L-shaped shape.

[0102] In the first embodiment, the branch portions C12 and C22 of the cuts C (cuts C2 and C1) extend in a direction (Y direction) perpendicular to the base portions C11 and C21. That is, the angle between the extending direction of the base portions C11 and C21 and the extending direction of the branch portions C12 and C22 intersects at 90 degrees.

[0103] In this embodiment, by providing such a tearing score line M, the tearing score line M can be torn in one direction (OD direction) along the longitudinal direction (X direction) from one end side of the base C11, C21 where the branch portions C12, C22 are continuous, thereby allowing the tearing score line M to be torn from one end (side surface 15 side of the packaging bag 10) to the other end (side surface 16 side of the packaging bag 10).

[0104] Therefore, according to this embodiment, even if the packaging bag 10 constituting the sheet packaging body 100 is made of paper, the tearing score line M for forming the removal opening 30 on the top surface 11 of the packaging bag 10 is easily torn, making it easy to form the removal opening 30 (Figures 1 and 12).

[0105] In addition, in the first embodiment, the branch portions C12, C22 of the cut C (cuts C2, C1) extend in a direction (Y direction) perpendicular to the base portions C11, C21, so that the shape of the cut C (cuts C1, C2) composed of the base portions C11, C21 and the branch portions C12, C22 becomes L-shaped.

[0106] In the tearing score line M including such cuts C (cuts C2, C1), by tearing in one direction (OD direction) along the longitudinal direction (X direction) from one end side of the bases C11, C21 where the branch portions C12, C22 are continuous, it is possible to tear cleanly from one end of the tearing score line M (the side of the end surface 15 of the packaging bag 10) to the other end (the side of the end surface 16 of the packaging bag 10) (Figures 1 and 12).

[0107] Second Embodiment Fig. 14 is a diagram (corresponding to Fig. 10) showing a sheet packaging body of a second embodiment. Fig. 15 is an enlarged diagram (corresponding to Fig. 11) of region R2 in Fig. 14. In Figs. 14 and 15, parts common to the first embodiment are designated by the same reference numerals as in Figs. 10 and 11, and description thereof will be omitted.

[0108] In the sheet packaging body 100 of the second embodiment, the branch portions C12, C22 of the cuts C (cuts C2, C1) extend in a direction such that the angle between the branch portions C12, C22 and the base portions C11, C21 is an obtuse angle. That is, the angle between the extending direction of the base portions C11, C21 and the extending direction of the branch portions C12, C22 is greater than 90 degrees.

[0109] The obtuse angle between the branch portions C12, C22 and the base portions C11, C21 is not particularly limited, but is, for example, 95 degrees or more and 150 degrees or less, preferably 100 degrees or more and 145 degrees or less, and more preferably 105 degrees or more and 140 degrees or less.

[0110] In the second embodiment, the branch portions C12, C22 of the cut C (cuts C2, C1) extend in a direction in which the angle between the branch portions C12, C22 and the base portions C11, C21 is an obtuse angle, thereby forming a modified L-shaped cut C (cuts C2, C1) in which the branch portions C12, C22 are inclined away from the base portions C11, C21 (Figures 14 and 15).

[0111] In the second embodiment, the branches C12 and C22 of the cut C (cuts C2 and C1) are arranged outside the gap between the bases C11 and C21. The branches C12 and C22 are arranged within a gap B4 that is shorter than the length B2 of the base C11 in the longitudinal direction (X direction) (FIG. 15).

[0112] In the tearing score line M including such cuts C (cuts C2, C1), by tearing in one direction (OD direction) along the longitudinal direction (X direction) from one end side of the bases C11, C21 where the branch portions C12, C22 are continuous, it is possible to tear cleanly from one end of the tearing score line M (the side of the end surface 15 of the packaging bag 10) to the other end (the side of the end surface 16 of the packaging bag 10) (Figures 14 and 15).

[0113] Third Embodiment Fig. 16 is a diagram (corresponding to Fig. 10) showing a sheet packaging body of a third embodiment. Fig. 17 is an enlarged diagram (corresponding to Fig. 11) of region R2 in Fig. 16. In Figs. 16 and 17, parts common to the first embodiment are designated by the same reference numerals as in Figs. 10 and 11, and description thereof will be omitted.

[0114] In the sheet packaging body 100 of the third embodiment, the branch portions C12, C22 of the cuts C (cuts C2, C1) extend in a direction such that the angle between the branch portions C12, C22 and the base portions C11, C21 is an acute angle. That is, the angle between the extending direction of the base portions C11, C21 and the extending direction of the branch portions C12, C22 is smaller than 90 degrees.

[0115] The acute angle between the branch portions C12, C22 and the base portions C11, C21 is not particularly limited, but is, for example, 30 degrees or more and 85 degrees or less, preferably 35 degrees or more and 80 degrees or less, and more preferably 40 degrees or more and 75 degrees or less.

[0116] In the third embodiment, the branch portions C12, C22 of the cut C (cuts C2, C1) extend in a direction in which the angle between the branch portions C12, C22 and the base portions C11, C21 is acute, thereby forming a modified L-shaped cut in which the branch portions C12, C22 are inclined toward the base portions C11, C21 (Figures 16 and 17).

[0117] In the third embodiment, the branches C12 and C22 of the cut C (cuts C2 and C1) are arranged between the bases C11 and C21. The branches C12 and C22 are arranged within a distance B4 that is shorter than the length B2 of the base C11 in the longitudinal direction (X direction) (FIG. 17).

[0118] With the tearing score line M including such a cut, in both cases where the tearing is performed in one direction (OD1 direction) along the longitudinal direction (X direction) from one end side (end surface 15 side of the packaging bag 10) of the bases C11 and C21 where the branch portions C12 and C22 are continuous, and where the tearing is performed in one direction (OD2 direction) along the longitudinal direction (X direction) from the other end side (end surface 16 side of the packaging bag 10) of the bases C11 and C21 where the branch portions C12 and C22 are not continuous, the tearing score line M can be torn from one end (end surface 15 side of the packaging bag 10) to the other end (end surface 16 side of the packaging bag 10) (Figures 16 and 17).

[0119] <Fourth embodiment> Fig. 18 is a diagram (corresponding to Fig. 10) showing a sheet packaging body of the fourth embodiment. Fig. 19 is an enlarged diagram (corresponding to Fig. 11) of region R2 in Fig. 18. In Figs. 18 and 19, parts common to the first embodiment are designated by the same reference numerals as in Figs. 10 and 11, and description thereof will be omitted.

[0120] In the fourth embodiment, a sheet packaging body 100 is provided in which the cuts C (cuts C1, C2) include first branch portions C12, C22 that are continuous with one end of the base portions C11, C21 and extend from the one end toward the opposite cut C (cuts C2, C1) in the width direction (Y direction), and second branch portions C13, C23 that are continuous with the other end of the base portions C11, C21 and extend from the other end toward the opposite cut C (cuts C2, C1) in the width direction (Y direction).

[0121] In the fourth embodiment, a channel-shaped cut is formed by the cut C (cuts C1, C2) including first branch portions C12, C22 that extend continuously from one end of the base C11, C21 toward the opposing cut C (cuts C2, C1) in the width direction (Y direction), and second branch portions C13, C23 that extend continuously from the other end of the base C11, C21 toward the opposing cut C (cuts C2, C1) in the width direction (Y direction) (Figures 18 and 19).

[0122] With such a tearing score line M, in both cases where the first branch portions C12, C22 are torn in one direction (OD1 direction) along the longitudinal direction (X direction) from one end side of the base portions C11, C21 where they are continuous, and where the second branch portions C13, C23 are torn in one direction (OD2 direction) along the longitudinal direction (X direction) from the other end side of the base portions C11, C21 where they are continuous, the tearing score line M can be torn from (the side of the end surface 15 of the packaging bag 10) to the other end (the side of the end surface 16 of the packaging bag 10) (Figures 18 and 19).

[0123] Therefore, according to the fourth embodiment, even if the packaging bag 10 constituting the sheet packaging body 100 is made of paper, the tearing score line M for forming the removal opening 30 on the top surface 11 of the packaging bag 10 is easily torn, making it easier to form the removal opening 30.

[0124] In the sheet packaging body 100 of the fourth embodiment, the first branch portions C12, C22 and the second branch portions C13, C23 extend in parallel. In the fourth embodiment, the first branch portions C12, C22 and the second branch portions C13, C23 extend in parallel, so that in two cuts C (cuts C1, C2) adjacent in the longitudinal direction (X direction), the second branch portions C13, C23 of one cut C (cuts C1, C2) and the first branch portions C12, C22 of the other cut C (cuts C1, C2) are aligned in parallel in the longitudinal direction (FIGS. 18 and 19).

[0125] With such a tearing score line M, in both cases where the first branch portions C12, C22 are torn in one direction (OD1 direction) along the longitudinal direction (X direction) from one end side of the base portions C11, C21 where they are continuous, and where the second branch portions C13, C23 are torn in one direction (OD2 direction) along the longitudinal direction (X direction) from the other end side of the base portions C11, C21 where they are continuous, the tearing score line M can be torn cleanly from one end (side surface 15 side of the packaging bag 10) to the other end (side surface 16 side of the packaging bag 10) (Figures 18 and 19).

[0126] Fifth Embodiment Fig. 20 is a diagram (corresponding to Fig. 10) showing a sheet wrapping body of a fifth embodiment. Fig. 21 is an enlarged diagram (corresponding to Fig. 11) of region R2 in Fig. 20. In Figs. 20 and 21, parts common to the first embodiment are designated by the same reference numerals as in Figs. 18 and 19, and description thereof will be omitted.

[0127] In the sheet packaging body 100 of the fifth embodiment, the first branch portions C12, C22 extend in a direction such that the angle between the first branch portions C12, C22 and the base portions C11, C21 is an acute angle, and the second branch portions C13, C23 extend in a direction such that the angle between the second branch portions C13, C23 and the base portions C11, C21 is an obtuse angle.

[0128] The acute angle between the first branch portions C12, C22 and the base portions C11, C21 is not particularly limited, but is, for example, 30 degrees to 85 degrees, preferably 35 degrees to 80 degrees, and more preferably 40 degrees to 75 degrees. The obtuse angle between the second branch portions C12, C22 and the base portions C11, C21 is not particularly limited, but is, for example, 95 degrees to 150 degrees, preferably 100 degrees to 145 degrees, and more preferably 105 degrees to 140 degrees.

[0129] As a result, in the fifth embodiment, the first branch portions C12, C22 are inclined toward the base portions C11, C21, and the second branch portions C13, C23 are inclined away from the base portions C11, C21, thereby forming a modified channel-shaped cut in which the first branch portions C12, C22 and the second branch portions C13, C23 extend parallel to each other (Figures 20 and 21).

[0130] In the fifth embodiment, the first branch portions C12, C22 and the second branch portions C13, C23 extend parallel to each other while being inclined in this manner, so that in two cuts C (cuts C1, C2) adjacent to each other in the longitudinal direction (X direction), the second branch portions C13, C23 of one cut C (cuts C1, C2) and the first branch portions C12, C22 of the other cut C (cuts C1, C2) are arranged parallel to each other while being inclined in the longitudinal direction (Figures 20 and 21).

[0131] With such a tearing score line M, in both cases where the first branch portions C12, C22 are torn in one direction (OD1 direction) along the longitudinal direction (X direction) from one end side of the base portions C11, C21 where they are continuous, and where the second branch portions C13, C23 are torn in one direction (OD2 direction) along the longitudinal direction (X direction) from the other end side of the base portions C11, C21 where they are continuous, the tearing score line M can be torn cleanly from one end (side surface 15 side of the packaging bag 10) to the other end (side surface 16 side of the packaging bag 10) (Figures 20 and 21).

[0132] The cut branch portions employed in the first to fifth embodiments may be used in combination. [Example]

[0133] The present invention will be described in more detail below with reference to examples. The examples and comparative examples were evaluated by the following tests.

[0134] [Test specimen] As a test sample, a sheet package 100 was prepared in which a plurality of sheets S (sheet stack 20) ​​were pillow-packaged in a paper packaging bag 10 (FIGS. 1 to 8).

[0135] The packaging bag 10 was made of a base material BS, which was composed of a base layer 10A, an inner layer 10B, and an outer layer 10C. The inner layer 10B was made of low-density polyethylene (PE). The outer layer 10C was a gravure printed layer. Two types of base materials (base materials 1 and 2) shown in Table 1 were used for the base material BS. The conditions for base materials 1 and 2 are shown in Table 1.

[0136] [Table 1]

[0137] A tearing score line (perforation) M is formed on the top surface 11 of the packaging bag 10 to form a take-out opening 30 extending in the longitudinal direction (MD direction) of the top surface 11 of the packaging bag 10. The tearing score line M is configured such that a pair of cuts C1, C2 facing each other in the width direction (Y direction) of the top surface 11 are lined up in the longitudinal direction (X direction) of the top surface 11 at a predetermined interval B1.

[0138] The sheet stack 20 is a stack of sheets S folded and stacked together, and is composed of single (1-ply) paper towels (product name "Elveil Paper Towel Eco Dry (medium size)" manufactured by Daio Paper Corporation, 200 sets, height H1: 65 mm, length L1: 210 mm, width (depth) W1: 115 mm, basis weight 33 g / m 2 The paper used was 180 μm thick.

[0139] [Yonetsubo] The basis weight (grammage) of the base material (all layers) BS and base layer 10A of the packaging bag 10 in the test specimen (sheet packaging body 100) was measured in accordance with the provisions of JIS P 8124 (2011). The unit of basis weight is g / m2 is.

[0140] [Paper thickness] The thickness (thickness) of the substrate (all layers) BS and base layer 10A of the packaging bag 10 in the test specimen (sheet packaging body 100) was measured using an ISO paper thickness meter (MEI-11, manufactured by CITIZEN Co., Ltd.) in accordance with the provisions of JIS P 8118 (2014). The unit of thickness is μm.

[0141] [Tensile strength] The tensile strength (cN / 25mm) of the base material (all layers) BS and base layer 10A of the packaging bag 10 in the test specimen (sheet packaging body 100) was measured in 25mm equivalent in the longitudinal direction (MD direction) and transverse direction (CD direction) using a Tensilon universal testing machine (RTG-1210, manufactured by A&D Co., Ltd.) in accordance with the provisions of JIS P 8113 (2006).

[0142] [stretch] The elongation (%) in the longitudinal direction (MD direction) and transverse direction (CD direction) of the substrate (all layers) BS and base layer 10A of the packaging bag 10 in the test specimen (sheet packaging body 100) was measured using a Tensilon universal testing machine (RTG-1210, manufactured by A&D Co., Ltd.) in accordance with the provisions of JIS P 8113 (2006).

[0143] [Tear strength] The tear strength (mN) in the longitudinal direction (MD) and transverse direction (CD) of the fiber of the substrate (all layers) BS and base layer 10A of the packaging bag 10 in the test specimen (sheet packaging body 100) was measured using a tear strength tester (Elmendorf tear strength tester (digital display type) manufactured by Kumagai Riki Kogyo Co., Ltd.) in accordance with the provisions of JIS P 8116 (2000).

[0144] [Openability] The ease of opening (openability) of the tearing score line (perforation) M formed on the top surface 11 of the packaging bag 10 of the test specimen (sheet packaging body 100) was confirmed. The openability was evaluated based on whether or not the tearing score line (perforation) M could be torn all the way when the tearing score line (perforation) M formed on the top surface 11 of the packaging bag 10 was torn in one direction (OD1 direction) from one end (the end surface 15 side of the packaging bag 10) to the other end (the end surface 16 side of the packaging bag 10) and in one direction (OD2 direction) from the other end (the end surface 16 side of the packaging bag 10) to one end (the end surface 15 side of the packaging bag 10). The evaluation criteria were as follows: [Evaluation criteria] Excellent: Perforation M was torn all the way to the end in both directions Good: Perforation M split all the way in one direction Unacceptable: The perforation did not tear all the way through

[0145] Examples and comparative examples will be described below.

[0146] [Example 1] The base material 1 in Table 1 was used, the length of the outlet 30 was 120 mm, the width was 5 mm, the shape of the perforation M constituting the outlet 30 was L-shaped, each cut C (cuts C1, C2) of the perforation M was composed of bases C11, C21 and branches C12, C22, the length B2 of the bases C11, C21 was 1 mm, the length D2 of the branches C12, C22 was 1 mm, the angle of the branches C12, C22 relative to the bases C11, C21 was 90 degrees, the length B3 of the ties T1, T2 between the cuts C (cuts C1, C2) was 1 mm, and the ratio of the ties T1, T2 to the bases C11, C21 was 1:1 (Figures 1, 3, 10, and 11). The conditions and evaluation results of Example 1 are shown in Table 2.

[0147] [Example 2] Test specimens were prepared and evaluated in the same manner as in Example 1, except that the length D2 of the branches C12 and C22 was 0.5 mm, the length B3 of the ties T1 and T2 between the cuts C (cuts C1 and C2) was 2 mm, and the ratio of the ties T1 and T2 to the bases C11 and C21 was 2:1. The conditions and evaluation results of Example 2 are shown in Table 2.

[0148] [Example 3] Test specimens were prepared and evaluated in the same manner as in Example 1, except that the length B2 of the bases C11 and C21 was 2 mm, the length D2 of the branches C12 and C22 was 0.5 mm, and the ratio of ties T1 and T2 to bases C11 and C21 was 1:2. The conditions and evaluation results of Example 3 are shown in Table 2.

[0149] [Example 4] Using base material 2 in Table 1, a test specimen was prepared and evaluated in the same manner as in Example 1, except that the length B2 of bases C11 and C21 was 6 mm, the length B3 of ties T1 and T2 between cut C (cuts C1 and C2) was 3 mm, and the ratio of ties T1 and T2 to bases C11 and C21 was 1:2. The conditions and evaluation results of Example 4 are shown in Table 2.

[0150] [Example 5] 14 and 15, specimens were prepared and evaluated in the same manner as in Example 4, except that the shape of the perforation M was a modified L-shape and the angle of the branch portions C12 and C22 relative to the base portions C11 and C21 was 135 degrees. The conditions and evaluation results of Example 5 are shown in Table 2.

[0151] [Example 6] Using the base material 1 in Table 1, a test specimen was prepared and evaluated in the same manner as in Example 4, except that the shape of the perforation M was a modified L-shape, the length D2 of the branch portions C12 and C22 was 2 mm, and the angle of the branch portions C12 and C22 with respect to the base portions C11 and C21 was 45 degrees, as shown in Figures 16 and 17. The conditions and evaluation results of Example 6 are shown in Table 2.

[0152] [Example 7] Using base material 2 in Table 1, a test specimen was prepared and evaluated in the same manner as in Example 6, except that the length D2 of branch portions C12 and C22 was set to 1 mm. The conditions and evaluation results of Example 7 are shown in Table 2.

[0153] [Example 8] Using the base material 1 in Table 1, a test specimen was prepared and evaluated in the same manner as in Example 4, except that the shape of the perforation M was a channel shape, as shown in Figures 18 and 19, each cut C (cuts C1, C2) of the perforation M was composed of base portions C11, C21, first branch portions C12, C22, and second branch portions C13, C23, the angles of the first branch portions C12, C22 relative to the base portions C11, C21 were 90 degrees, and the angles of the second branch portions C13, C23 relative to the base portions C11, C21 were 90 degrees. The conditions and evaluation results of Example 8 are shown in Table 2.

[0154] [Example 9] 20 and 21, specimens were prepared and evaluated in the same manner as in Example 8, except that the shape of the perforation M was a modified channel shape, the angle of the first branch portions C12 and C22 relative to the base portions C11 and C21 was 45 degrees, and the angle of the second branch portions C13 and C23 relative to the base portions C11 and C21 was 135 degrees. The conditions and evaluation results of Example 9 are shown in Table 2.

[0155] [Comparative Example 1] A test specimen was prepared and evaluated in the same manner as in Example 4, except that the substrate 1 was used, the width of the outlet 30 was 10 mm, the perforations M constituting the outlet 30 were linear, and each cut C (cuts C1, C2) of the perforations M was composed only of base portions C11, C21 (branch portions C12, C22 were not provided). The conditions and evaluation results of Comparative Example 1 are shown in Table 2.

[0156] Comparative Example 2 A test specimen was prepared and evaluated in the same manner as in Comparative Example 1, except that the width of outlet 30 was 5 mm, the length B2 of bases C11 and C21 was 2.5 mm, the length B3 of ties T1 and T2 between cuts C (cuts C1 and C2) was 1 mm, and the ratio of ties T1 and T2 to bases C11 and C21 was 1:2.5. The conditions and evaluation results of Comparative Example 2 are shown in Table 2.

[0157] Comparative Example 3 A test specimen was prepared and evaluated in the same manner as in Comparative Example 1, except that the width of outlet 30 was 5 mm, the length B2 of bases C11 and C21 was 4 mm, and the length B3 of ties T1 and T2 between cuts C (cuts C1 and C2) was 2 mm. The conditions and evaluation results of Comparative Example 3 are shown in Table 2.

[0158] Comparative Example 4 Except for the fact that the length B2 of the bases C11 and C21 was set to 6 mm and the length B3 of the ties T1 and T2 between the cuts C (cuts C1 and C2) was set to 3 mm, a test specimen was prepared and evaluated in the same manner as in Comparative Example 3. The conditions and evaluation results of Comparative Example 4 are shown in Table 2.

[0159] Comparative Example 5 A test specimen was prepared and evaluated in the same manner as in Comparative Example 4, except that Substrate 2 was used. The conditions and evaluation results of Comparative Example 5 are shown in Table 2.

[0160] [Table 2]

[0161] As can be seen from Table 1, the test specimen, in which the cuts C (cuts C1, C2) that constitute the tearing score line M for forming the access opening 30 on the top surface 11 of the packaging bag 10 made of a base material BS containing a paper component are approximately L-shaped cuts including bases C11, C21 extending in the longitudinal direction (X direction) and branch portions C12, C22 extending from one end of the bases C11, C21 toward the opposite cut C (cuts C2, C1) in the width direction (Y direction), can be torn from one end of the bases C11, C21 where the branch portions C12, C22 are continuous along the longitudinal direction (X direction) to tear from one end of the bases C11, C21 to the other end of the tearing score line M. Therefore, even if the packaging bag 10 that constitutes the sheet packaging body 100 is made of paper, the tearing score line M for forming the removal opening 30 on the top surface 11 of the packaging bag 10 is easy to tear, making it easy to form the removal opening 30 (Examples 1 to 9).

[0162] In contrast, when the cuts constituting the splitting score line M were only at the base (without branches), the splitting score line M was difficult to split, making it difficult to form the outlet 30 (Comparative Examples 1 to 5).

[0163] Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims. [Explanation of symbols]

[0164] 100 sheet packaging 10 packaging bags BS base material IS inside OS external 10A base layer (paper layer) 10B Inner layer (resin layer) 10C Outer layer (printing layer) 11 Top 12 Bottom 13, 14 Side 15, 16 Wife face 20 Sheet stack S seat 30 Outlet M Cut line for tearing (perforation) C, C1, C2 cut C11, C21 base C12, C22 branch (1st branch) C13, C23 2nd branch T, T1, T2 Thailand OP Opening 40, 50 Seal part (end seal) 60 Seal part (bottom seal) L1, L2 length W1, W2, W3 width B1, B3, B4, B5 spacing B2 length D1, D3 interval D2 length H1, H2 height

Claims

1. A sheet packaging body having a packaging bag for storing a plurality of stacked sheets, and a tearing score line provided on a top surface of the packaging bag, which when torn, forms an opening for taking out the sheets on the top surface, The packaging bag is composed of a substrate including a base layer containing a paper component and a resin layer containing a thermoplastic resin provided on at least one surface of the base layer, The tearing score line is formed by a pair of cuts facing each other in the width direction of the top surface, the cuts being arranged at predetermined intervals in the longitudinal direction of the top surface perpendicular to the width direction, Each cut constituting the pair of cuts is a base portion extending in the longitudinal direction; a first branch portion that is continuous with one end of the base portion and extends from the one end toward a cut that faces the base portion in the width direction; a second branch portion that is continuous with the other end of the base portion and extends from the other end toward the cut that is opposite to the other end in the width direction; the first branch portion extends in a direction such that an angle between the first branch portion and the base portion is an acute angle; the second branch portion extends in a direction such that an angle between the second branch portion and the base portion is an obtuse angle; Sheet packaging.

2. The first branch portion and the second branch portion extend parallel to each other. The sheet packaging body according to claim 1 .

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