JP7683231B2 - Sheet packaging - Google Patents

Description

The present invention relates to a sheet packaging body.

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. The packaging bag of the sheet package has perforations formed therein, and the package is opened by tearing the perforations. The opened portion of the packaging bag forms the outlet for the sheets (for example, Patent Documents 1 and 2).

In recent years, from the viewpoint of reducing environmental burdens such as global warming due to _CO2 emissions and marine pollution due to microplastics, there has been a movement to shift the material of packaging bags in sheet packaging bodies from resin to paper.

JP 2008-183034 A JP 2018-177364 A

However, because paper packaging bags are less flexible than plastic packaging bags, if the packaging bag for the sheet package is made of paper, the sheet may get stuck at the outlet or fall into the packaging bag when the sheet is removed.

The objective of the present invention is to provide a sheet package with a paper packaging bag that allows for easy removal of the sheet.

The first aspect of the present invention is a sheet packaging body having a pillow packaging bag that contains multiple stacked sheets and has a pair of seal parts at both ends in the longitudinal direction, 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 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, the ratio of the paper component being 50% or more, when the number of plies of the sheet is 1 ply, the length of the outlet is 80% or more and 100% or less of the distance between the pair of seal parts in the longitudinal direction of the upper surface, and when the number of plies of the sheet is 2 ply or more, the length of the outlet is 70% or more and 90% or less of the distance between the pair of seal parts in the longitudinal direction of the upper surface.

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 top surface of the pillow packaging bag refers to the area that extends between a pair of seals of the pillow packaging bag. A resin layer provided on at least one side of a paper layer refers to either a two-layer structure in which a resin layer is provided on one side of a paper layer, or a three-layer structure in which resin layers are laminated on both sides of a paper layer.

In the first aspect, a pillow packaging bag is used that has a paper layer containing a paper component and a resin layer provided on at least one side of the paper layer, and the ratio of the paper component is 50% or more, thereby providing a sheet packaging body in which flexibility is imparted to the pillow packaging bag in which the sheet is contained.

In addition, by forming an outlet on the top surface of such a pillow packaging bag that extends in the longitudinal direction of the pillow packaging bag, and setting the ratio of the length of the outlet to the distance between a pair of seal portions in the longitudinal direction of the top surface of the pillow packaging bag to 80% or more and 100% or less when the number of plies of the sheet contained in the pillow packaging bag is 1 ply, and to 70% or more and 90% or less when the number of plies of the sheet is 2 plies or more, the sheet can be easily removed from the outlet and can be prevented from falling into the pillow packaging bag.

In addition, in the first aspect, 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 side of the paper layer, which makes the pillow packaging bag soft. This reduces the stiffness of the packaging bag in the sheet packaging body and gives the pillow packaging bag conformability. Therefore, even if the material of the packaging bag is shifted from resin to paper, it is possible to provide a sheet packaging body in which the packaging bag is less likely to tear during manufacturing or transportation.

In addition, in the first aspect, since the resin layer provided on at least one of the surfaces of the paper layer contains a thermoplastic resin, by heating a part of the pillow packaging bag when sealing (or sealing) the pillow packaging bag, the melted resin layer can function as an adhesive (have an adhesive function). Therefore, in the first aspect, it is possible to provide a sheet packaging body that allows easy sealing of the pillow packaging bag.

Furthermore, in the first aspect, since the ratio of paper components in the pillow packaging bag is 50% or more, it is possible to provide a sheet packaging body with reduced environmental impact.

A second aspect of the present invention is a sheet packaging body, in which the paper layer has a basis weight of 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 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 packaging body in which the pillow packaging bag is less likely to tear can be provided.

The third aspect of the present invention is a sheet packaging body 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 kraft pulp mixed with rayon fiber, which is chemically synthesized from wood pulp or the like. From the viewpoint of achieving both softness and strength in the packaging bag, it is preferable that the rayon fiber content of the rayon paper is 20% or less by mass.

In the third aspect, the paper layer of the pillow packaging bag is made of craft paper or rayon paper, making it possible to provide a sheet packaging body that maintains the strength of the pillow packaging bag while suppressing the stiffness of the packaging bag.

A fourth aspect of the present invention is a sheet packaging body in which the thickness of the resin layer is 5 μm or more and 40 μm or less. In the fourth aspect, by making the thickness of the resin layer of the pillow packaging bag 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. In addition, it is possible to provide a sheet packaging body in which the adhesive function of the resin layer is maintained when the pillow packaging bag is sealed while suppressing the stiffness of the packaging bag.

The fifth aspect of the present invention is a sheet packaging body 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 packaging body that further suppresses the stiffness of the packaging bag while improving the adhesive function of the resin layer when sealing the pillow packaging bag.

A sixth aspect of the present invention is a sheet packaging body, wherein the Clark stiffness in the longitudinal direction of the pillow packaging bag is 3 ^cm3 /100 or more and 20 ^cm3 /100 or less. In this specification, the Clark stiffness is measured in accordance with the provisions of JIS P 8143. The longitudinal direction refers to the flow direction of the fibers constituting the pillow packaging bag.

In the sixth aspect, the Clark stiffness in the vertical direction of the pillow packaging bag is set to 3 ^cm3 /100 or more and 20 ^cm3 /100 or less, thereby improving the flexibility and conformability of the pillow packaging bag. As a result, in the sixth aspect, the sheet can be more easily removed from the removal opening, and the sheet can be further prevented from falling into the pillow packaging bag.

A seventh aspect of the present invention is a sheet packaging body, in which the number of plies of the sheet is 1, 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 number of plies of the sheet contained in the pillow packaging bag is 1, a length of the take-out opening that is 80% or more and 100% or less of the distance between a pair of sealed portions in the longitudinal direction of the upper surface of the pillow packaging bag is applied.

Furthermore, in the seventh aspect, by setting the basis weight of one ply of sheet contained in the pillow packaging bag to be 5 g/ ^m2 or more and 80 g/m2 or ^less , when one ply of sheet is contained in the sheet packaging body, the sheet becomes easier to remove from the removal opening and the falling of the sheet into the pillow packaging bag can be further suppressed.

The eighth aspect of the present invention is a sheet packaging body in which 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.

In this specification, softness refers to softness measured in accordance with the provisions of JIS L 1096 E method. The longitudinal direction is the flow direction of the fibers that make up the sheet, and the transverse direction is the direction perpendicular to the flow direction of the fibers that make up the sheet.

In the eighth aspect, when a one-ply sheet is stored in a pillow packaging bag, a sheet having a vertical softness of 50 mN/100 mm or more and 350 mN/100 mm or less and a horizontal softness of 20 mN/100 mm or more and 320 mN/100 mm or less is used. This makes it easier to remove the one-ply sheet from the removal opening in the sheet packaging body, and further prevents the one-ply sheet from falling into the pillow packaging bag.

A ninth aspect of the present invention is a sheet packaging body, in which the number of plies of the sheet is 2, and the basis weight of the sheet is 1 g/ ^m2 or more and 50 g/ ^m2 or less per ply. In the ninth aspect, since the number of plies of the sheet contained in the pillow packaging bag is 2, a length of the take-out opening that is 70% or more and 90% or less of the distance between a pair of sealed portions in the longitudinal direction of the upper surface of the pillow packaging bag is applied.

Furthermore, in the ninth aspect, by setting the basis weight of the two-ply sheet contained in the pillow packaging bag to between 1 g/ ^m2 and 50 g/ ^m2 per ply, when two-ply sheets are contained in the sheet packaging body, the sheets become easier to remove from the removal opening, and the falling of the sheets into the pillow packaging bag can be further suppressed.

The tenth aspect of the present invention is a sheet packaging body in which 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.

In the tenth aspect, when a two-ply sheet is placed in a pillow packaging bag, a sheet having a vertical softness of 15 mN/100 mm or more and 45 mN/100 mm or less and a horizontal softness of 10 mN/100 mm or more and 40 mN/100 mm or less is used. This makes it easier to remove the two-ply sheet from the removal opening in the sheet packaging body, and further prevents the two-ply sheet from falling into the pillow packaging bag.

According to one aspect of the present invention, it is possible to provide a sheet package with a paper packaging bag that is easy to remove the sheet from.

FIG. 2 is a diagram showing a sheet wrapping body according to an embodiment. FIG. 2 is a diagram showing a sheet contained in a packaging bag. 2 is a view of the sheet wrapping body of FIG. 1 as seen from above. FIG. 2 is a bottom view of the sheet wrapping body of FIG. 1 . FIG. FIG. 2 is a front view of the sheet wrapping body of FIG. 1 . 2 is a view of the sheet wrapping body of FIG. 1 as seen from the rear side. FIG. 2 is a view of the sheet wrapping body of FIG. 1 as seen from the left side. FIG. 2 is a view of the sheet wrapping body of FIG. 1 as seen from the right side. FIG. 4 is a partial cross-sectional view of the upper surface in a region R1 of FIG. 3. FIG. 4 is a partial cross-sectional view (three-layer structure) of the upper surface in a region R1 of FIG. 3 . FIG. 4 is a partial enlarged view of a region R2 in FIG. 3 . FIG. 12 is a cross-sectional view taken along the tearing score line of FIG. 11 . FIG. 12 is a cross-sectional view (three-layer structure) taken along the tearing score line in FIG. 11 . FIG. 1 is a diagram showing an example of a tool for forming a tearing score line in a packaging bag. 4 is a diagram showing a state in which the sheet packaging body of FIG. 3 is torn along a tear score line. FIG. FIG. 2 is a diagram showing a state in which the sheet wrapping body of FIG. 1 is in use.

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

Figure 1 is a diagram showing a sheet packaging body of an embodiment. Figure 2 is a diagram showing a sheet contained in a packaging bag. Figures 3, 4, 5, 6, 7, and 8 are views of the sheet packaging body of Figure 1 as seen from the top, bottom, front, back, left side, and right side, respectively.

As shown in FIG. 1, the sheet packaging body 100 has a packaging bag 10 and a sheet stack 20 (multiple 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 pillow packaging bag in the sheet packaging body of this embodiment. The sheet stack 20 is an example of multiple sheets stacked in the sheet packaging body of this embodiment.

As shown in FIG. 2, the packaging bag 10 contains multiple stacked sheets (or multiple sets) of sheets S (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 by one (one set) through an outlet 30 (opening OP) (described later) formed in the packaging bag 10 (see FIG. 16).

The form of the stack SL of sheets S (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 and alternating state (a so-called pop-up type sheet stack), or a stack of multiple sheets S simply stacked.

The dimensions of the sheet S (sheet stack 20) can be such that the length L2 in the longitudinal direction (X direction) of the packaging bag 10 is approximately 150 to 260 mm, the width W2 in the width direction (Y direction) perpendicular to the longitudinal direction (X direction) of the packaging bag 10 is approximately 70 to 150 mm, and the height H2 in the height direction (Z direction) is approximately 20 to 100 mm. Such a tissue paper stack can be manufactured, for example, by a rotary or multi-stand interfolder.

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, and toilet paper. These sanitary thin papers also include sanitary thin papers containing moisturizing ingredients (for example, lotion tissue, etc.).

The use of the sheet S is not particularly limited, and it can be used for industrial, household, or portable purposes. Among these, the sheet in this embodiment is preferably used as a paper towel for industrial or household use.

The number of plies in the sheet S is not particularly limited, but can be one or more, preferably one or two or more, and more preferably one or two. The shape of the sheet S is also not particularly limited, but for example, it is preferable that the outline shape of the sheet when folded is quadrangular (rectangle, square, etc.).

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 a known composition for paper sheets. For example, the blending ratio of pulp may be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

The pulp composition in the sheet S (paper sheet) is not particularly limited. For example, any ratio of 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. The ratio of hardwood pulp to softwood pulp is not limited, but is preferably 10:90 to 80:20, and more preferably, the ratio of softwood pulp to hardwood pulp is higher in the pulp composition. The pulp contained in the sheet S (paper sheet) may be recycled paper pulp.

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).

For example, when the number of plies of the sheet S is 1, 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, more preferably 15 g/m ² or more and 45 g/m ² or less, even more preferably 20 g/m ² or more and 40 g/m ² or less, and even more preferably 25 g/m ² or more and 35 g/m ² or less. When the number of plies of the sheet S is 2, the basis weight of the sheet S is 1 g/m ² or more and 50 g/m ² or less per ply, 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, even more preferably 5 g/m ² or more and 25 g/m ² or less, and even more preferably 10 g/m ² or more and 20 g/m ² or less. Furthermore, when the sheet S is a nonwoven fabric, the basis weight of the sheet S is preferably 20 g/m ² or more and 100 g/m ² or less.

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 used. For example, if the sheet S is paper, the paper thickness is 50 μm or more and 600 μm or less per two plies, preferably 60 μm or more and 550 μm or less, and more preferably 100 μm or more and 400 μm or less.

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

For example, when the number of plies of the sheet S is 1, 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, even more preferably 100 mN/100 mm or more and 300 mN/100 mm or less, and particularly preferably 150 mN/100 mm or more and 250 mN/100 mm or less.

The lateral softness of one ply of sheet S 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, even 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.

The longitudinal direction of the sheet corresponds to the flow direction of the fibers that make up the sheet, and the transverse direction of the sheet corresponds to the direction perpendicular to the flow direction of the fibers that make up the sheet.

When the number of plies of the sheet S is 2, 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, even 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.

When the sheet S has two plies, the lateral softness 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, even 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.

The sheet S (paper sheet) may also be embossed. Such embossing can be performed using a known embossing method.

Figure 9 is a partial cross-sectional view of the top surface in region R1 of Figure 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 side of the paper layer 10A (Figures 9 and 10). The ratio of the paper component in the packaging bag 10 is 50% or more.

Here, the paper component is, for example, plant fibers glued together (pulp). The pulp composition of the paper component is not limited, but is preferably a pulp composition in which the ratio of softwood pulp to hardwood pulp is higher. In addition, recycled paper pulp may be used as the pulp.

In this embodiment, the resin layer provided on at least one side of the paper layer 10A is, for example, a two-layer structure in which a resin layer 10B is provided on one side of the paper layer 10A (Figure 9), or a three-layer structure in which resin layers 10B and 10C are laminated on both sides of the paper layer 10A (Figure 10).

The material of the paper layer 10A that constitutes the packaging bag 10 is not particularly limited, but it can be made of, for example, kraft paper or rayon paper. Here, kraft paper is paper made from kraft pulp. Rayon paper is made by blending rayon fiber, which is chemically synthesized from wood pulp, into kraft pulp. From the perspective of achieving both softness and strength in the packaging bag 10, it is preferable that the rayon fiber blending ratio of the rayon paper be 20% or less by mass.

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

The thickness of the packaging bag 10 (paper layer 10A) is not limited, but 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).

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

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).

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, and 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).

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

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

The tensile strength of the packaging bag 10 is not limited, but may be, 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).

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 that make up the packaging bag, and the horizontal direction of the packaging bag corresponds to the direction perpendicular to the flow direction of the fibers that make up the packaging bag.

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).

The Clark stiffness of the packaging bag 10 is not particularly limited, but the Clark stiffness in the longitudinal direction is preferably 3 ^cm3 /100 or more and 20 ^cm3 /100 or less, more preferably 4 ^cm3 /100 or more and 18 ^cm3 /100 or less, and even more preferably 5 ^cm3 /100 or more and 16 ^cm3 /100 or less. The Clark stiffness is measured in accordance with the provisions of JIS P 8143.

The packaging bag 10 has an upper surface 11, a lower surface 12, a side surface 13, a side surface 14, an end surface 15, and an end surface 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 surface 13 and the side surface 14 face each other in the width direction (Y direction), and the end surface 15 and the end surface 16 face each other in the longitudinal direction (X direction).

The upper surface 11 and the lower surface 12 are connected via a seal portion 40 on the end surface 15 side, and via a seal portion 50 on the end surface 16 side. In other words, the upper surface 11 of the packaging bag 10 is the area extending between the pair of seal portions 40, 50 of the packaging bag 10 (FIGS. 1, 3 to 8).

The dimensions of the packaging bag 10 are arbitrary, and 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) 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. Note that these dimensions of the packaging bag 10 indicate the dimensions when the sheet laminate 20 is contained in the packaging bag 10.

The upper surface 11 of the packaging bag 10 is formed with an outlet 30 that extends in the longitudinal direction (X direction) of the packaging bag 10. Specifically, the outlet 30 is formed with a tearing score line 30. Here, the tearing score line 30 indicates a score line where cuts C and ties T (two cuts C and the uncut portion between C) are alternately arranged, and when a tie T is broken, the adjacent cuts C on both sides become continuous cuts (Figs. 1, 3, and 11).

Figure 11 is a partial enlarged view of region R2 in Figure 3. The tear-open score line 30 is composed of a straight perforation M in which cuts C and ties T are arranged alternately (Figures 1, 3, and 11). The tear-open score line 30 is formed on the top surface 11 of the packaging bag 10. In the packaging bag 10, by tearing this perforation M, an opening OP is formed on the top surface 11 of the packaging bag 10 through which the sheet S can be pulled out (Figures 3 and 15).

The length L3 of the tearing score line 30 is not particularly limited, and in this embodiment, for example, it is adjusted to a length that fits inside the upper surface 11 of the packaging bag 10 (Figure 3). Note that the tearing score line 30 is an example of a tearing score line in the sheet packaging body of this embodiment.

The shape of the tearing score line 30 is not particularly limited, but in the case of a configuration in which a resin layer 10B is provided on one side of a paper layer 10A (two-layer structure), it is preferable that the cut C of the tearing score line 30 penetrates the paper layer 10A and the resin layer 10B (Figures 9 and 12). Here, penetrating the paper layer 10A and the resin layer 10B means that the cut C of the tearing score line 30 penetrates the laminated paper layer 10A and the resin layer 10B in the thickness direction (Figure 12).

In addition, in the case of a structure in which resin layers 10B, 10C are laminated on both sides of a paper layer 10A (three-layer structure), it is preferable that the cut C of the tearing score line 30 penetrates the paper layer 10A and the resin layers 10B, 10C (Figs. 10 and 13). Here, penetrating the paper layer 10A and the resin layers 10B, 10C means that the cut C of the tearing score line 30 penetrates the laminated paper layer 10A and the resin layers 10B, 10C in the thickness direction (Fig. 13).

The length D1 of the cut C in the tearing score 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 refers to the length of each cut C in the tearing score line 30.

The length of the tie T in the tearing 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 refers to the length of each tie T in the tearing cut line.

In this embodiment, the ratio of the cut C in the tearing score line 30 is not particularly limited, but is preferably 60% to 95%, more preferably 65% to 90%, and more preferably 70% to 85%. The cut ratio indicates the ratio of the length D1 of the cut C to the sum of the lengths D1 and D2 of the adjacent cuts C and ties T in the tearing score line 30.

In the sheet packaging body 100 of this embodiment, the length L3 of the tearing score line 30 is adjusted by the number of plies of the sheet S. Specifically, when the number of plies of the sheet S is 1, the length L3 of the tearing score 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, of the length L1 in the longitudinal direction (X direction) of the packaging bag 10 when the number of plies of the sheet S is 1.

When the number of plies of the sheet S is 2 or more, the length L3 of the tearing score line 30 is 70% or more and 90% or less of the length L1 of the packaging bag 10 in the longitudinal direction (X direction), preferably 72% or more and 88% or less, and more preferably 75% or more and 85% or less.

Here, the length of the packaging bag 10 in the longitudinal direction (X direction) corresponds to the distance L1 between the pair of seal portions 40, 50 in the longitudinal direction (X direction) of the upper surface 11. Also, the length L3 of the tearing score line 30 corresponds to the length L3 of the removal opening 30.

The method for creating the tearing score line 30 is arbitrary, and for example, it can be created using the tool 90 shown in FIG. 14. Specifically, the packaging bag 10 (packaging bag sheet) is placed between the needle part 91 and the base part 92 of the tool 90, and the tip 91A of the needle part 91 is inserted toward the receiving groove 92A of the base part 92, thereby forming the tearing score line 30.

In addition, in the sheet packaging body 100, a ventilation hole (not shown) may be formed in the packaging bag 10. The ventilation hole can function as an air hole in the packaging bag 10. The method for making the ventilation hole is arbitrary, and for example, the same method as the method for making the tearing score line 30 described above can be used.

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

In the sheet packaging body 100 of this embodiment, the packaging bag 10 is configured as a pillow packaging bag having a pair of seal portions 40, 50 at both ends in the longitudinal direction (X direction). Specifically, the seal portions (end seals) 40, 50 are formed on the end faces 15, 16 of the packaging bag 10, and the seal portion (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.

Here, the pillow packaging bag is formed by processing a packaging bag sheet (not shown) into a cylindrical shape and sealing the open end of the cylindrical packaging bag sheet. In this embodiment, the cylindrical packaging bag sheet that constitutes the pillow packaging bag 10 may be folded into a gusset shape.

The configuration of the sealing portions 40, 50, and 60 is not particularly limited. For example, if the packaging bag 10 is composed only of the paper layer 10A, the sealing portions 40, 50, and 60 can be bonded with an adhesive (not shown) (Figure 9).

In addition, the packaging bag 10 has the seal portions 40, 50, and 60 heat-sealed. Here, heat-sealing refers to heating parts of the packaging bag sheet to weld parts of the packaging bag sheet together.

Specifically, in the two-layered packaging bag (pillow packaging bag) 10 shown in FIG. 9, the seal portions 40, 50, and 60 are heat-sealed with the resin layer 10B disposed on the inside or outside of the packaging bag 10. In the three-layered packaging bag (pillow packaging bag) 10 shown in FIG. 10, the seal portions 40, 50, and 60 are heat-sealed with either the resin layer 10B or the resin layer 10C disposed on the inside of the packaging bag 10.

The heating temperature for heat welding is arbitrary. For example, in the case of the two-layer structure shown in FIG. 9 in which the resin layer 10B is disposed on the outside of the packaging bag 10, the seal portions 40 and 50 may be sealed with an adhesive and adjusted to a temperature at which the adhesive is welded. In addition, in the case of the two-layer structure shown in FIG. 9 in which the resin layer 10B is disposed on the inside of the packaging bag 10, or in the case of the three-layer structure shown in FIG. 10 in which either the resin layer 10B or 10C is disposed on the inside of the packaging bag 10, the heating temperature 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 even more preferably 140° C. or higher and 160° C. or lower.

In this embodiment, as described above, by using a pillow packaging bag 10 having a 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 side of the paper layer 10A, and having a paper component ratio of 50% or more, it is possible to provide a sheet packaging body 100 in which flexibility is imparted to the pillow packaging bag 10 in which the sheet S is contained (Figure 16).

In addition, in this 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 the pillow packaging bag 10, and the ratio of the length L3 of the outlet 30 to the distance L1 between a pair of seal portions 40, 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 contained 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 also prevents the sheet S from falling into the pillow packaging bag 10.

In addition, in this 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 side of the paper layer 10A, or resin layers 10B and 10C, which makes it possible to soften the pillow packaging bag 10. This makes it possible to reduce the stiffness of the packaging bag 10 and to impart conformability to the pillow packaging bag 10. Therefore, even if the material of the packaging bag 10 in the sheet packaging body 100 is shifted from resin, it is possible to provide a sheet packaging body 100 in which the packaging bag is less likely to tear during manufacturing or transportation.

In addition, in this embodiment, since the resin layer 10B or the resin layers 10B and 10C provided on at least one side of the paper layer 10A contain a thermoplastic resin, by heating a part of the pillow packaging bag 10 when sealing (or sealing) the pillow packaging bag 10, the melted resin layer can function as an adhesive (have an adhesive function). Therefore, in this embodiment, a sheet packaging body 100 that allows easy sealing of the pillow packaging bag 10 can be provided.

Furthermore, in this embodiment, since the ratio of paper components in the pillow packaging bag 10 is 50% or more, it is possible to provide a sheet packaging body 100 with reduced environmental impact.

In this embodiment, as described above, the strength of the pillow packaging bag can be maintained by setting the basis weight of the paper layer 10A to 10 g/m2 or ^more and 40 g/m2 or ^less . Therefore, according to this embodiment, a sheet packaging body that makes the pillow packaging bag less likely to tear can be provided.

In this embodiment, as described above, by forming the paper layer 10A from craft paper or rayon paper, it is possible to provide a sheet packaging body 100 that maintains the strength of the pillow packaging bag 10 while suppressing the stiffness of the packaging bag 10.

In this embodiment, as described above, by setting the thickness of the resin layer 10B or the resin layers 10B and 10C of the pillow packaging bag 10 to 5 μm or more and 40 μm or less, it becomes easier to maintain the ratio of paper components in the packaging bag 10 at 50% or more. In addition, it is possible to provide a sheet packaging body in which the adhesive function of the resin layer is maintained when the pillow packaging bag 10 is sealed while suppressing the stiffness of the packaging bag 10 in the sheet packaging body 100.

In this embodiment, as described above, by using low-density polyethylene as the thermoplastic resin contained in resin layer 10B of pillow packaging bag 10 or in resin layers 10B and 10C, it is possible to provide a sheet packaging body that further reduces the stiffness of pillow packaging bag 10 while improving the adhesive function of the resin layer when sealing pillow packaging bag 10.

In this embodiment, as described above, by setting the Clark stiffness in the vertical direction of pillow packaging bag 10 to be 3 ^cm3 /100 or more and 20 ^cm3 /100 or less, the flexibility and conformability of pillow packaging bag 10 are improved. As a result, in this embodiment, sheet S can be more easily removed from removal opening 30, and falling of sheet S into pillow packaging bag 10 can be further suppressed.

In this embodiment, as described above, the number of plies of the sheet S contained in the pillow packaging bag 10 is one, so the length L3 of the outlet 30 is set to be 80% or more and 100% or less of the distance L1 between the pair of sealing portions 40, 50 in the longitudinal direction (X direction) of the upper surface 11 of the pillow packaging bag 10.

Furthermore, in this embodiment, by setting the basis weight of one ply of sheet S contained in pillow packaging bag 10 to be 5 g/ ^m2 or more and 80 g/ ^m2 or less, when one ply of sheet S is contained in sheet packaging body 100, it becomes even easier to remove sheet S from removal opening 30, and also the falling of sheet S into pillow packaging bag 10 can be further prevented.

In this embodiment, as described above, when one ply of sheet S is stored in the pillow packaging bag 10, a sheet S having a vertical softness of 50 mN/100 mm or more and 350 mN/100 mm or less and a horizontal softness of 20 mN/100 mm or more and 320 mN/100 mm or less is used. This makes it easier to remove the one ply of sheet S from the removal opening 30 in the sheet packaging body 100, and further prevents the one ply of sheet S from falling into the pillow packaging bag 10.

In this embodiment, as described above, the number of plies of the sheet S contained in the pillow packaging bag 10 is two, so the length L3 of the outlet 30 is set to be 70% or more and 90% or less of the distance L1 between the pair of sealing portions 40, 50 in the longitudinal direction (X direction) of the upper surface 11 of the pillow packaging bag 10.

Furthermore, in this embodiment, by setting the basis weight of the two plies of sheet S contained in pillow packaging bag 10 to between 1 g/ ^m2 and 50 g/ ^m2 per ply, when two plies of sheet S are contained in sheet packaging body 100, it becomes even easier to remove sheet S from removal opening 30, and also the falling of sheet S into pillow packaging bag 10 can be further suppressed.

In this embodiment, as described above, when storing two-ply sheet S in pillow packaging bag 10, sheet S having a vertical softness of 15 mN/100 mm or more and 45 mN/100 mm or less and a horizontal softness of 10 mN/100 mm or more and 40 mN/100 mm or less is used. This makes it even easier to remove two-ply sheet S from outlet 30 in sheet packaging body 100, and further prevents two-ply sheet S from falling into pillow packaging bag 10.

The present invention will now be described in more detail with reference to examples. The examples and comparative examples were evaluated using the following tests.

[Test specimen]
As a test specimen, a sheet packaging body 100 in which a plurality of sheets S (sheet laminate 20) were pillow-packaged in a packaging bag 10 was prepared (FIGS. 1 to 8). The sheet stack 20 used paper towels in which the sheets S were folded and stacked, and included single (1-ply) paper towels (product name "Elveil Paper Towel Eco Dry (medium size)", manufactured by Daio Paper Co., Ltd., 200 sheets, height H1: 67 mm, length L1: 210 mm, width (depth) W1: 115 mm, basis weight: 30 g/ ^m2 , softness vertical 206 mN/100 mm, softness horizontal 177 mN/100 mm) and double (2-ply) paper towels (product name "Elleair Paper Towel Smart Type Double (medium size)", manufactured by Daio Paper Co., Ltd., 200 sets, height H1: 60 mm, length L1: 210 mm, width (depth) W1: 115 mm, basis weight 16 g/ ^m2 x 2, softness vertical 31 mN/100 mm, softness horizontal 25 mN/100 mm). A perforation M (a cutting line 30 for tearing) is formed on the upper surface 11 of the pillow packaging bag 10.

[Basic weight]
The basis weight of the packaging bag 10 in the sheet packaging body 100 (test specimen) was measured in accordance with the provisions of JIS P 8124 (2011). The unit of basis weight is g/ ^m2 .

[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 thickness is μm.

[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 density is g/ ^m3 .

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

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

[Tear strength]
For the packaging bag 10 of the test specimen, the tear strength in the longitudinal direction (machine direction) and transverse direction (direction perpendicular to the machine direction) of the fibers 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).

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

[Softness of packaging bag]
The softness of the test packaging bag 10 was measured using a handle-o-meter (hand feel tester, manufactured by Kumagai Riki Kogyo Co., Ltd.) according to the handle-o-meter method in accordance with JIS L 1096 E method. The test piece had a size of 100 mm x 100 mm, and the clearance was 20 mm. The softness of the packaging bag was measured five times in each of the front and vertical directions (flow direction) and the front and horizontal directions (direction perpendicular to the flow direction), and the average value of the five measurements was expressed in units of mN/100 mm.

[Seat softness]
The softness of the test specimens (1-ply and 2-ply) was measured using a handle-o-meter (hand feel tester manufactured by Kumagai Riki Kogyo Co., Ltd.) according to the handle-o-meter method conforming to JIS L 1096 E method. The test pieces were 100 mm x 100 mm in size, with a clearance of 20 mm. The softness of the sheet was measured five times each in the face-length direction (flow direction) and face-width direction (direction perpendicular to the flow direction) for 1 ply, and five times each in the face-length direction (flow direction) and width direction (direction perpendicular to the flow direction) for 2 ply, and the average value of the five measurements was expressed in units of mN/100 mm.

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

[Initial removability]
The ease of removal (initial take-out) was evaluated when removing the first sheet (first set) to the tenth set of sheets S of the sheet laminate 20 from the sheet laminate 20 contained in the pillow packaging bag 10 of the sheet packaging body 100 through the opened removal opening 30 (opening OP) of the pillow packaging bag 10. The initial take-out ease was evaluated according to the following criteria, with 3 or more being good and 2 or less being bad.
<Single and double>
5: Very easy to remove 4: Easy to remove 3: Can be removed 2: Can be removed but difficult 1: Cannot be removed

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

[Non-depression]
When the first sheet (one set) to the last sheet (one set) of the sheet laminate 20 contained in the pillow packaging bag 10 of the sheet packaging body 100 were taken out through the opened take-out opening 30 (opening OP) of the pillow packaging bag 10, the number of times that the sheets S were not held by the take-out opening 30 and fell into the pillow packaging bag 10 was measured. The non-falling property was evaluated according to the following criteria, with 3 or more being good and 2 or less being bad.
＜Single＞
5: 0-10 times 4: 11-20 times 3: 21-30 times 2: 31-40 times 1: 41 times or more <Double>
5: 0-5 times 4: 6-15 times 3: 16-25 times 2: 26-35 times 1: 36 times or more

[Orthostasis]
When the sheet stack 20 contained in the pillow packaging bag 10 of the sheet packaging body 100 was pulled out from the first set to the last set through the opened outlet 30 (opening OP) of the pillow packaging bag 10, the number of times that the sheets S continued to stand up while being held at the outlet 30 was measured. The standing up ability was evaluated only for the double sheet according to the following criteria, with 3 or more being good and 2 or less being bad.
<Double>
5:80 or more, 4:60, 3:40, 2:20, 1:0

The materials used in the examples and comparative examples are explained below.

[Material 1]
The paper layer 10A was made of rayon paper with a basis weight of 20 g/ ^m2 , and the resin layer 10B was made of low-density polyethylene with a thickness of 11 μm to form the material 1. The properties of the material 1 (basis weight, thickness, density, tensile strength, elongation, tear strength, Beck smoothness, softness, and Clark stiffness) are shown in Table 1.

[Material 2]
Material 2 was constructed in the same manner as material 1, except that rayon paper having a basis weight of 30 g/ ^m2 was used for the paper layer 10A. The properties of material 2 are shown in Table 1.

[Material 3]
Material 3 was constructed in the same manner as material 1, except that kraft paper having a basis weight of 30 g/ ^m2 was used for the paper layer 10A. The properties of material 3 are shown in Table 1.

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

[Material 5]
Material 5 was constructed in the same manner as Material 1, except that no paper layer was formed and a low-density polyethylene having a thickness of 22 μm was used for the resin layer. The properties of Material 5 are shown in Table 1.

The following describes examples and comparative examples.

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

[Example 2]
Except for the fact that the perforation ratio was 100%, the film was produced and evaluated in the same manner as in Example 1. The results are shown in Table 2.

[Example 3]
Except for disposing the resin layer 10B on the outer side of the packaging bag 10, the packaging bag 10 was produced and evaluated in the same manner as in Example 2. The results are shown in Table 2.

[Example 4]
Measurements and evaluations were carried out 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.

[Example 5]
Measurements and evaluations were carried out 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.

[Example 6]
Measurements and evaluations were carried out 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.

[Example 7]
Measurements and evaluations 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.

[Example 8]
Measurements and evaluations 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.

[Example 9]
Measurements and evaluations 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.

[Comparative Example 1]
Except for changing the perforation ratio to 75%, measurements and evaluations were carried out in the same manner as in Example 1. The results are shown in Table 3.

[Comparative Example 2]
Measurements and evaluations 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.

[Comparative Example 3]
Except for using Material 1 instead of Material 2 and changing the perforation ratio to 65%, measurements and evaluations were performed in the same manner as in Comparative Example 1. The results are shown in Table 3.

[Comparative Example 4]
Measurements and evaluations 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.

[Comparative Example 5]
Measurements and evaluations 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.

[Example 10]
Except for using a double sheet S (sheet laminate 20) and setting the perforation ratio to 75%, measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 4.

[Example 11]
Except for using a double sheet as the sheet S (sheet laminate 20), the measurements and evaluations were carried out in the same manner as in Example 1. The results are shown in Table 4.

[Example 12]
Except for disposing the resin layer 10B on the outer side of the packaging bag 10, the packaging bag 10 was produced and evaluated in the same manner as in Example 11. The results are shown in Table 4.

[Example 13]
Measurements and evaluations were carried out 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.

[Example 14]
Measurements and evaluations were carried out 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.

[Example 15]
Measurements and evaluations were carried out 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.

[Example 16]
Measurements and evaluations were carried out 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.

[Example 17]
Measurements and evaluations were carried out 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.

[Example 18]
Measurements and evaluations were carried out 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.

[Comparative Example 6]
Except for changing the perforation ratio to 65%, measurements and evaluations were carried out in the same manner as in Example 10. The results are shown in Table 5.

[Comparative Example 7]
Except for changing the perforation ratio to 100%, the measurements and evaluations were performed in the same manner as in Comparative Example 6. The results are shown in Table 5.

[Comparative Example 8]
Measurements and evaluations 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.

[Comparative Example 9]
Measurements and evaluations 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.

[Comparative Example 10]
Measurements and evaluations 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.

[Comparative Example 11]
Measurements and evaluations 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.

As can be seen from Tables 1 and 2, the test specimens (sheet packaging bodies) in which a single sheet (sheet laminate) was placed in a pillow packaging bag using materials 1 to 4 and the perforation ratio of the pillow packaging bag was 85% to 100% had good initial removal properties, pop-up properties, and anti-sagging properties (Examples 1 to 9).

In contrast, as can be seen from Tables 1 and 3, the sheet packages (Comparative Examples 1 to 4) in which a single sheet (laminated sheet) was placed in a pillow packaging bag using materials 1 to 3 and the perforation ratio of the packaging bag was set to 75% or less were poor in at least one of the initial removal properties, pop-up properties, and non-sinking properties. Note that the sheet package (Comparative Example 5) in which a single sheet (laminated sheet) was placed in a pillow packaging bag using material 5 and the perforation ratio of the packaging bag was set to 100% was made of a pillow packaging bag made only of resin.

In addition, from Tables 1 and 4, it can be seen that the sheet packaging bodies (Examples 10 to 18) in which a double sheet (sheet laminate) was placed in a pillow packaging bag using Materials 1 to 4 and the perforation ratio of the pillow packaging bag was set to 75% to 85% had good initial removal properties, pop-up properties, and anti-drop properties.

In contrast, as can be seen from Tables 1 and 5, the sheet packages (Comparative Examples 6 to 10) in which a double sheet (sheet laminate) was placed in a pillow packaging bag using materials 1 to 3 and the perforation ratio of the packaging bag was 65% or 100% were poor in at least one of the initial removal properties, pop-up properties, non-sagging properties, and standing properties. In the sheet package (Comparative Example 11) in which a double sheet (sheet laminate) was placed in a pillow packaging bag using material 5 and the perforation ratio of the packaging bag was 100%, the pillow packaging bag was made only of resin.

From these results, it was found that a sheet package having a paper layer containing a paper component and a resin layer containing a thermoplastic resin provided on at least one side of the paper layer, in which a paper component ratio is 50% or more and an outlet extending in the longitudinal direction of the pillow packaging bag is formed on the top surface of the pillow packaging bag, and the length of the outlet relative to the distance between a pair of seal portions in the longitudinal direction of the top surface is 80% to 100% when the number of plies of the contained sheet is 1 ply, and 70% to 90% when the number of plies of the sheet is 2 plies or more, is excellent in terms of sheet removal as a paper sheet package.

Although the embodiment of the present invention has been described above, the present invention is not limited to a specific embodiment, and various modifications and variations are possible within the scope of the invention described in the claims.

REFERENCE SIGNS LIST 100 Sheet packaging body 10 Packaging bag 10A Paper layer 10B, 10C Resin layer 11 Upper surface 12 Lower surface 13, 14 Side surface 15, 16 End surface 20 Sheet laminate S Sheet 30 Cutting line for tearing (take-out opening)
M Perforation C Cut T Tie D1, D2 Length OP Opening (take-out port)
40, 50 Seal section (end seal)
60 Seal part (bottom seal)
90 Instrument 91 Needle 91A Tip 92 Base 92A Receiving groove L1, L2, L3 Length W1, W2 Width H1, H2 Height R1, R2 Area

Claims (8)

a pillow packaging bag in which a plurality of stacked sheets are contained and which has a pair of seal portions at both ends in a longitudinal direction;
a take-out opening formed on an upper surface of the pillow packaging bag and extending in a longitudinal direction of the pillow packaging bag;
The pillow packaging bag is
A paper layer including a paper component;
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,
The thickness of the resin layer is 9 μm or more and 30 μm or less,
The pillow packaging bag has a basis weight of 30 g/m2 or ^more and 60 g/ ^m2 or less,
The thickness of the pillow packaging bag is 45 μm or more and 80 μm or less,
When the number of plies of the sheet is 1, the length of the take-out opening is 80% or more and 100% or less of the distance between the pair of sealed portions in the longitudinal direction when the pillow packaging bag is viewed from the top side,
When the number of plies of the sheet is 2 or more, the length of the take-out opening is 70% or more and 90% or less of the distance between the pair of sealed portions in the longitudinal direction when the pillow packaging bag is viewed from the top side,
The Clark stiffness of the pillow packaging bag in the longitudinal direction is 3 cm ³ /100 or more and 20 cm ³ /100 or less ,
The pillow packaging bag has a longitudinal tear strength of 90 mN or more and 330 mN or less,
The sheet packaging body , wherein the longitudinal elongation of the pillow packaging bag is 2.7% or more and 3.8% or less . 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 . The paper layer is formed of kraft paper or rayon paper.
The sheet packaging body according to claim 1 or 2. The thermoplastic resin is low density polyethylene.
The sheet packaging body according to any one of claims 1 to 3. The number of plies of the sheet is one 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. The sheet,
The softness in the longitudinal direction is 50 mN/100 mm or more and 350 mN/100 mm or less,
The lateral softness is 20 mN/100 mm or more and 320 mN/100 mm or less.
The sheet packaging body according to claim 5 . The number of plies of the sheet is two,
The basis weight of the sheet is 1 g/m ² or more and 50 g/m ² or less per ply,
The sheet packaging body according to any one of claims 1 to 4. The sheet,
The softness in the longitudinal direction is 15 mN/100 mm or more and 45 mN/100 mm or less,
The lateral softness is 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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