WO2025204210A1 - Packaging bag, sanitary paper package, method for manufacturing packaging bag, collective packaging bag, and method for manufacturing collective packaging bag - Google Patents

Abstract

This packaging bag is made of a resin film and is used for packaging sanitary paper, wherein the resin film contains a component derived from a leftover material of the packaging bag, and a load at 2% elongation in an MD direction of the resin film is 2.0-6.5 N.

Description

Packaging bag, sanitary paper packaging body, manufacturing method of packaging bag, collective packaging bag, and manufacturing method of collective packaging bag

The present invention relates to packaging bags, sanitary paper packaging bodies, methods for manufacturing packaging bags, collective packaging bags, and methods for manufacturing collective packaging bags.

Patent Document 1 discloses a bag containing household tissue paper, in which household tissue paper is stored in a bag body formed from a flexible film, with perforations formed on the surface of the bag body, and the household tissue paper can be pulled out from a slit that opens when the perforations are torn open. Furthermore, Patent Document 2 discloses a film package with perforations for opening, in which perforations for opening are formed in a flexible film base wrapped around a sanitary paper laminate.

Patent No. 2008-183034 Japanese Patent Application Laid-Open No. 2018-177364

However, packaging bags used to package sanitary paper such as tissue paper and paper towels can be difficult to open because the openings on the bags are designed to prevent them from being torn during transport or sale. Furthermore, while there is a need to promote the use of recycled resources such as biomass and recycled raw materials from the perspective of a recycling-oriented society and reducing environmental impact, using recycled resources does not result in the same level of transparency or physical properties as regular products.

The objective of the present invention is to provide a packaging bag that has a low environmental impact and is easy to open.

A packaging bag according to one aspect of the present disclosure is a packaging bag made of a resin film for packaging sanitary paper, wherein the resin film contains components derived from leftover materials from the packaging bag, and the load of the resin film at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less.

One aspect of the present invention makes it possible to provide a packaging bag that has a low environmental impact and is easy to open.

FIG. 1 is a diagram showing an example of a sanitary paper package using the packaging bag of the embodiment. FIG. 10 is a diagram showing an example of sanitary paper packed in the packaging bag of the embodiment. FIG. 2 is a view of FIG. 1 as seen from the top side. FIG. 2 is a diagram showing the sanitary paper packaging of FIG. 1 in use. FIG. 10 is a diagram showing an example of a leftover packaging bag. FIG. 1 is a flow chart illustrating some steps in a method for manufacturing a sanitary paper package. FIG. 2 is a diagram showing an original sheet of resin film that constitutes a packaging bag. FIG. 8 is a diagram showing the state in which printing is performed on the base web of FIG. 7. FIG. 9 is a diagram showing the state in which the printed raw sheet of FIG. 8 has been cut. FIG. 1 is a flow chart for explaining a part of the process of the manufacturing method of the packaging bag (production of the resin film). FIG. 10 is a diagram showing an example of a leftover material of a collective packaging bag. FIG. 2 is a view showing an original sheet of resin film that constitutes a collective packaging bag. FIG. 1 is a flow diagram of a method for manufacturing a sanitary paper package, including a method for manufacturing a collective packaging bag. FIG. 1 is a flow chart for explaining a part of the steps (packaging multiple pieces of sanitary paper) in a method for manufacturing a sanitary paper package, including a method for manufacturing a collective packaging bag.

Embodiments of the present invention will be described in detail below with reference to the drawings. Common parts in each drawing will be given the same reference numerals and their explanations may be omitted. Furthermore, the scale of each component in each drawing may differ from the actual scale.

In this specification, the directions in the drawings are explained using a three-dimensional Cartesian coordinate system with three axial directions (X, Y, and Z). In each drawing, the left-right direction (the lengthwise direction of the sanitary paper laminate, packaging bag, or sanitary paper package) is the X direction, the front-to-back direction (the widthwise direction of the sanitary paper laminate, packaging bag, or sanitary paper package) is the Y direction, and the up-down direction (the heightwise direction of the sanitary paper laminate, packaging bag, or sanitary paper package) is the Z direction.

Furthermore, in this specification, deviations in each direction are permitted to the extent that they do not impair the functions and effects of the embodiments. Note that perpendicular may also include approximately perpendicular.

<Packaging bags and sanitary paper packaging>
Fig. 1 is a diagram showing an example of a sanitary paper package using a packaging bag of the embodiment. Fig. 2 is a diagram showing an example of sanitary paper packaged in the packaging bag of the embodiment. Fig. 3 is a diagram showing Fig. 1 as viewed from the top side, and Fig. 4 is a diagram showing the sanitary paper package of Fig. 1 in use. Fig. 5 is a diagram showing an example of leftover material from the packaging bag.

In Figure 1, the sanitary paper packaging 100 comprises a sanitary paper laminate 10 and a packaging bag 20. As shown in Figure 2, the sanitary paper laminate 10 is made up of multiple (multiple sheets or multiple sets) stacked sanitary paper sheets 10A. The sanitary paper laminate 10 is contained in the packaging bag 20 so that the stacking direction LD of the sanitary paper sheets 10A is the height direction (Z direction). The sanitary paper laminate 10 is designed so that the sanitary paper sheets 10A can be pulled out one set at a time through an outlet 30 (opening OP) formed in the packaging bag 20, which will be described later.

The form of the sanitary paper laminate 10 is not particularly limited, and can be, for example, a laminate of sanitary paper sheets 10A in a folded state, a laminate of sanitary paper sheets 10A in a folded state with each sheet stacked alternately (a so-called pop-up sanitary paper laminate), or a laminate of multiple sanitary paper sheets 10A simply stacked.

Furthermore, the dimensions of the sanitary paper laminate 10 can be approximately 150 to 250 mm in the longitudinal direction (X direction) of the packaging bag 20, approximately 70 to 150 mm in the width direction (Y direction) perpendicular to the longitudinal direction (X direction) of the packaging bag 20, and approximately 20 to 100 mm in the height direction (Z direction). Such tissue paper laminates can be manufactured, for example, using a rotary or multi-stand interfolder.

The form of the sanitary paper 10A is not particularly limited, and it can be applied to sanitary thin papers such as tissue paper, paper towels, kitchen paper, and toilet paper. These sanitary thin papers also include sanitary thin papers containing moisturizing ingredients (for example, lotion tissues, etc.).

Furthermore, the use of sanitary paper 10A is not particularly limited, and it can be used for industrial, household, or portable purposes. Among these, household and portable tissue paper is preferably used as the sanitary paper in this embodiment.

The number of plies in the sanitary paper 10A is not particularly limited and can be one or more, preferably one or two plies (two layers). The shape of the sanitary paper 10A is also not particularly limited, but it is preferable that, for example, one ply of sanitary paper has a quadrangular (rectangular, square, etc.) outline when folded.

The material of the sanitary paper 10A is not particularly limited, but for example, base paper made primarily of pulp is used. The pulp composition can be any known composition for sanitary paper. For example, the pulp content can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

Furthermore, the pulp composition of the sanitary paper 10A 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.

In addition, the ratio of hardwood pulp to softwood pulp in sanitary paper is not limited, but is preferably 90:10 to 20:80, and more preferably a pulp composition in which the ratio of hardwood pulp to softwood pulp is higher. Furthermore, recycled paper pulp may also be used as the pulp contained in sanitary paper.

The basis weight of the sanitary paper 10A is not particularly limited, but is preferably 5 g/ ^m² to 80 g/ ^m² , more preferably 10 g/m² to 60 g/ ^m² , and even more preferably 10 g/ ^m² to 45 g ^{/ m²} , depending on the number of plies. For nonwoven fabric, a basis weight of 20 g/ ^m² to 100 g/ ^m² is preferred. The basis weight is measured in accordance with JIS P 8124 (2011).

Furthermore, the thickness of the sanitary paper is not particularly limited, and the paper thickness measured under the conditions specified in JIS P 8111 (1998) can be used. For example, if the sanitary paper 10A is paper, the paper thickness per two plies 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.

The sanitary paper 10A may also be embossed. Such embossing can be performed using a known embossing method. There are no particular limitations on the embossing method, and examples include the steel rubber method and the steel match method.

The packaging bag 20 is made of a resin film. There are no particular restrictions on the components of the resin film that makes up the packaging bag 20, and resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), and polyamide (PA) can be used. The polyethylene can be high-density polyethylene, low-density polyethylene, or the like.

Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible, easy to handle, have good heat-sealing properties, and are inexpensive. Furthermore, polyethylene is preferred because it is odorless, has excellent water and chemical resistance, and can be mass-produced at low cost.

In addition to the resin, the resin film may contain additives such as stabilizers and fillers. Furthermore, the color of the resin film in this disclosure (when not printed) is white, milky white, or transparent.

The form of the resin film forming the packaging bag 20 is not particularly limited, and may be a single-layer film formed from a single layer of the above-mentioned resin, a laminate film formed by laminating the above-mentioned resin, a film formed by bonding or laminating the above-mentioned resin with pulp paper or nonwoven fabric, or a mixed film formed from a mixture of two or more of the above-mentioned resins.

The thickness of the resin film forming the packaging bag 20 is not particularly limited, but is preferably 20 μm or more and 100 μm or less, more preferably 25 μm or more and 70 μm or less, and even more preferably 30 μm or more and 50 μm or less. By making the resin film thicker than 20 μm, sufficient strength can be ensured for the packaging bag 20 that contains the sanitary paper laminate 10. Furthermore, by making the resin film thicker than 100 μm, flexibility of the packaging bag 20 can be ensured and it can be made lighter.

The shape of the packaging bag 20 is not particularly limited, but is generally a rectangular parallelepiped when the sanitary paper laminate 10 is contained within the packaging bag 20. Such a roughly rectangular packaging bag 20 has a top surface 21, a bottom surface 22, a front surface 23, a back surface 24, and side surfaces 25 and 26. As shown in Figures 1, 3, and 4, the top surface 21 and bottom surface 22 of the packaging bag 20 face each other in the vertical direction (Z direction), the front surface 23 and back surface 24 face each other in the width direction (Y direction), and the side surfaces 25 and 26 face each other in the longitudinal direction (X direction). Furthermore, the side surfaces 25 and 26 are continuous with all of the top surface 21, bottom surface 22, front surface 23, and back surface 24.

The dimensions of the packaging bag 20 are not particularly limited. For example, the length of the packaging bag 20 in the longitudinal direction (X direction) can be approximately 150 to 250 mm, the length of the packaging bag 20 in the transverse direction (Y direction) perpendicular to the longitudinal direction (X direction) can be approximately 70 to 150 mm, and the height in the height direction (Z direction) can be approximately 20 to 100 mm. Note that the dimensions of the packaging bag 20 are those when the sanitary paper laminate 10 is contained in the packaging bag 20, as shown in Figures 1 and 2.

Furthermore, the packaging form of the packaging bag 20 is not particularly limited. In this embodiment, for example, packaging in which both ends of a tubular resin film are folded and sealed (caramel packaging), packaging in which both ends or either end of a tubular resin film folded into a gusset shape are sealed (pillow packaging), packaging in which a heat-shrinkable resin film is heated to adhere tightly to the packaged item (shrink packaging), or a combination of these may be used.

In this embodiment, a pair of opposing sides (sides 25 and 26 in this embodiment) in the longitudinal direction (X direction) of the packaging bag 20 are sealed with caramel packaging.

When the sanitary paper laminate 10 is placed in the packaging bag 20, the top surface 11, bottom surface 12, long side surfaces 13, long side surfaces 14, short side surfaces 15, and short side surfaces 16 of the sanitary paper laminate 10 face the top surface 21, bottom surface 22, front surface 23, back surface 24, side surfaces 25, and side surfaces 26 of the packaging bag 20, respectively.

A take-out opening 30 is provided on the top surface 21 of the packaging bag 20. As shown in Figure 4, the take-out opening 30 allows the sanitary paper 10A to be pulled out. The take-out opening 30 is configured as an opening OP. The opening OP that constitutes the take-out opening 30 may be configured by tearing perforations M (intermittent cuts), as shown in Figures 1 and 3.

The shape of the opening OP that constitutes the outlet 30 is not particularly limited, and may be, for example, a straight line, an elongated rectangle, an oval, a truck shape, a gourd shape (or a dumbbell shape) in a plan view. Here, a gourd shape (or a dumbbell shape) refers to an oval with a narrowed center. Of these, a straight line, an oval, a truck shape, or a gourd shape (or a dumbbell shape) is preferred, with a truck shape and a gourd shape (or a dumbbell shape) being more preferred, and a gourd shape (or a dumbbell shape) being even more preferred.

As shown in Figures 1, 3, and 4, the gourd-shaped (or dumbbell-shaped) outlet 30 in plan view has a shape in which the width of the central portion 31 of the outlet 30 is narrower than the width of the ends 32, 33 of the outlet 30. The shape of the central portion 31 of the outlet 30 is not particularly limited and may be, for example, an elongated rectangle. The shape of the ends 32, 33 of the outlet 30 is not particularly limited and may be, for example, an oval or a sector.

When the outlet 30 is gourd-shaped (or dumbbell-shaped) in plan view, the width (width in the Y direction) of the central portion 31 of the outlet 30 is not particularly limited, but is preferably 1 mm or more and 10 mm or less, more preferably 3 mm or more and 8 mm or less, and more preferably 4 mm or more and 6 mm or less.

The width (maximum width in the Y direction) of both ends 32, 33 of the outlet 30 is not particularly limited, but is preferably 5 mm or more and 50 mm or less, more preferably 10 mm or more and 45 mm or less, and more preferably 15 mm or more and 40 mm or less.

The ratio of the width of the central portion 31 of the outlet 30 (width in the Y direction) to the width of both ends 32, 33 of the outlet 30 (maximum width in the Y direction) is not particularly limited, but is preferably 5% to 40%, more preferably 7% to 30%, and even more preferably 10% to 25%.

The total length of the outlet 30 in the longitudinal direction (X direction) is not particularly limited, and is, for example, 40% to 100% of the total length of the top surface 21 of the packaging bag 20 of the sanitary paper packaging body 100 in the longitudinal direction (X direction), preferably 45% to 90%, and more preferably 50% to 80%.

The ratio of the longitudinal length (X direction) of the central portion 31 of the outlet 30 to the total longitudinal length (X direction) of the outlet 30 is not particularly limited, but is preferably 35% or more and 75% or less, more preferably 40% or more and 70% or less, and even more preferably 45% or more and 65% or less.

The ratio of the length of each of the ends 32, 33 of the outlet 30 in the longitudinal direction (X direction) to the total length of the outlet 30 in the longitudinal direction (X direction) is not particularly limited, but is preferably 5% or more and 45% or less, more preferably 10% or more and 30% or less, and even more preferably 15% or more and 25% or less.

In the sanitary paper packaging 100 disclosed herein, the resin film that makes up the packaging bag 20 contains components derived from packaging bag waste. In this specification, packaging bag waste (hereinafter sometimes simply referred to as waste) refers to unnecessary or excess material that was generated from the resin film used in the resin film packaging bags used to package sanitary paper and was not used to make the packaging bag.

Components derived from packaging bag waste are not particularly limited, and examples include resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), and polyamide (PA). Polyethylene may also be classified as high-density polyethylene or low-density polyethylene.

Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible, easy to handle, have good heat-sealing properties, and are inexpensive. Furthermore, polyethylene is preferred because it is odorless, has excellent water and chemical resistance, and can be mass-produced at low cost.

The packaging bags that are the source of the leftovers are packaging bags made of resin film used to package sanitary paper. Furthermore, the leftover packaging bags are preferably scraps of the resin film used to make the packaging bags. For example, as shown in Figure 5, the scraps of the resin film used to make the packaging bags are the remaining portion (also called trim) 220 after removing the printed portion 210 required for the packaging bag from the packaging bag material 200.

The content of components derived from leftover materials in the resin film that constitutes packaging bag 20 is preferably 2% by mass or more, more preferably 2.5% by mass or more, and even more preferably 3% by mass or more. The upper limit for the content of components derived from leftover materials in the resin film that constitutes packaging bag 20 is arbitrary, but from the viewpoint of not reducing the flexibility of the packaging bag, it is preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less.

In addition, the plastic film packaging bags used to package sanitary paper are usually printed, and the remaining material from these packaging bags contains printed components.

Therefore, in the packaging bag 20 of the present disclosure, the content of printed components in the components derived from the packaging bag waste is preferably 0.2% by mass or less, more preferably 1.5% by mass or less, and even more preferably 1.0% by mass or less. The lower limit for the content of printed components in the components derived from the packaging bag waste is arbitrary, but from the perspective of controlling the color of the packaging bag as much as possible, it is preferably 0% by mass.

The resin film constituting the packaging bag 20 of the present disclosure has a load at 2% elongation in the MD direction of 2.0 N or more and 6.5 N or less, preferably 2.5 N or more and 6.0 N or less, and more preferably 3.0 N or more and 5.5 N or less. The MD direction of the resin film indicates the direction in which the resin constituting the resin film flows.

Here, the load at 2% elongation of the resin film is a value measured in accordance with JIS K 7127 (1999), and indicates the load when the distance between the two benchmark lines on the resin film is elongated by 2% from its original level.

Furthermore, the load at 2% elongation in the TD direction is 2.5 N or more and 7.0 N or less, preferably 3.0 N or more and 6.5 N or less, and more preferably 3.5 N or more and 6.0 N or less. The TD direction of the resin film refers to the direction perpendicular to the MD direction (the flow direction of the resin that makes up the resin film).

The tear strength in the MD direction of the resin film constituting the packaging bag 20 of the present disclosure is preferably 700 mN or more and 2000 mN or less, more preferably 800 mN or more and 1800 mN or less, and even more preferably 900 mN or more and 1500 mN or less. Here, the tear strength of the resin film is a value measured in accordance with JIS P 8116 (2000) and indicates the strength when the resin film is torn.

Furthermore, the tear strength in the TD direction is preferably 9,500 mN or more and 13,000 mN or less, more preferably 10,000 mN or more and 12,500 mN or less, and even more preferably 10,500 mN or more and 11,900 mN or less.

The resin film constituting the packaging bag 20 of the present disclosure preferably has a tensile modulus in the MD direction of 150 MPa or more and 450 MPa or less, more preferably 200 MPa or more and 430 MPa or less, and even more preferably 230 MPa or more and 400 MPa or less. Here, the tensile modulus of the resin film is a value measured in accordance with JIS K 7127 (1999), and indicates the ratio of the tensile stress per unit cross-sectional area of the resin film to the strain generated in the stress direction.

Furthermore, the tensile modulus in the TD direction is preferably 250 MPa or more and 550 MPa or less, more preferably 270 MPa or more and 530 MPa or less, and even more preferably 300 MPa or more and 500 MPa or less.

The resin film constituting the packaging bag 20 of the present disclosure preferably has a tensile elongation in the MD direction of 500% or more and 850% or less, more preferably 550% or more and 800% or less, and even more preferably 600% or more and 750% or less. Here, the tensile elongation of the resin film is a value measured in accordance with JIS K 7127 (1999), and indicates the percentage of elongation until the resin film breaks when pulled at a specified speed.

Furthermore, the tensile elongation in the TD direction is preferably 550% or more and 900% or less, more preferably 600% or more and 850% or less, and even more preferably 650% or more and 800% or less.

The resin film constituting the packaging bag 20 of the present disclosure preferably has a tensile strength in the MD direction of 10 N/cm or more and 30 N/cm or less, more preferably 12 N/cm or more and 25 N/cm or less, and even more preferably 15 N/cm or more and 20 N/cm or less. Here, the tensile strength of the resin film is a value measured in accordance with JIS K 7127 (1999) and indicates the force when the resin film is pulled until it breaks.

The resin film constituting the packaging bag 20 of the present disclosure preferably has a tensile strength in the TD direction of 10 N/cm or more and 30 N/cm or less, more preferably 12 N/cm or more and 25 N/cm or less, and even more preferably 15 N/cm or more and 20 N/cm or less.

As described above, in the packaging bag 20 disclosed herein, the resin film that constitutes the packaging bag 20 that packages the sanitary paper 10A contains components derived from packaging bag waste, and therefore packaging bags 20 made from such resin film have a low environmental impact.

Furthermore, the resin film that makes up the packaging bag 20 contains components derived from leftover packaging bag materials, so that the load at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less. Such resin film is difficult to stretch and is easy for the perforation blade to penetrate when forming the perforations for opening, so packaging bags 20 made from such resin film have excellent openability. Furthermore, by making packaging bags from such resin film, the amount of lubricant used can be reduced.

As described above, in the packaging bag 20 of the present disclosure, the remaining material is scrap material from the packaging bag 20, so there is little printed material in the remaining material. Therefore, in a packaging bag made from a resin film containing such scrap material, the color of the packaging bag 20 can be made closer to the color of a packaging bag made from unrecycled or virgin materials.

As a result, even if the resin film that makes up the packaging bag 20 contains components derived from packaging bag waste, the packaging bag can be printed in a variety of colors according to the manufacturer's wishes. This encourages material reuse in the field of sanitary paper and promotes efforts to realize a sustainable society.

As described above, in the packaging bag 20 of the present disclosure, the resin film that constitutes the packaging bag 20 contains components derived from the leftover material of the packaging bag, which allows the load at 2% elongation in the TD direction to be 2.5 N or more and 7.0 N or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming the perforations for opening, so packaging bags 20 made from such a resin film have even better openability.

In the packaging bag 20 of the present disclosure, as described above, the resin film that constitutes the packaging bag 20 contains components derived from leftover packaging bag materials, which can result in a tear strength in the MD direction of 700 mN or more and 2000 mN or less. Such a resin film is even less likely to stretch, making it easier for a perforation blade to penetrate when forming perforations for opening, so packaging bags 20 made from such a resin film have even better openability.

As described above, in the packaging bag 20 of the present disclosure, the resin film that constitutes the packaging bag 20 contains components derived from the packaging bag's leftover material, which allows the tensile modulus in the MD direction to be 150 MPa or more and 450 MPa or less. Because such a resin film easily maintains its shape, a packaging bag 20 made from such a resin film allows the sanitary paper 10A contained in the packaging bag 20 to be removed one sheet at a time, resulting in excellent sanitary paper 10A removal properties.

In the packaging bag 20 of the present disclosure, the resin film that constitutes the packaging bag 20 contains components derived from the packaging bag's leftover material, as described above, which allows the tensile modulus in the TD direction to be 250 MPa or more and 500 MPa or less. Because such a resin film easily maintains its shape, packaging bags 20 made from such a resin film provide excellent ease of removal of the sanitary paper 10A.

In the packaging bag 20 of the present disclosure, the resin film that constitutes the packaging bag 20 contains components derived from leftover packaging bag materials, as described above, which allows the tensile elongation in the MD direction to be 500% or more and 850% or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming perforations for opening, so packaging bags 20 made from such a resin film have even better openability.

In the packaging bag 20 of the present disclosure, the resin film that makes up the packaging bag 20 contains components derived from packaging bag remnants, as described above, which allows the tensile strength in the MD direction to be 10 N/cm or more and 30 N/cm or less. Because such a resin film is more likely to retain its shape, a packaging bag 20 made from such a resin film can improve the ease of removal of the sanitary paper 10A.

In the packaging bag 20 of the present disclosure, the resin film that makes up the packaging bag 20 contains 2% by mass or more of components derived from packaging bag remnants, which ensures that the resin film that makes up the packaging bag 20 is less likely to stretch, allowing for the production of packaging bags 20 with excellent openability with high precision.

As described above, in the packaging bag 20 of the present disclosure, the content of printing components in the components derived from packaging bag remnants is 0.2% by mass or less. This means that even if the components derived from packaging bag remnants contain printing components, the color of the packaging bag 20 can be made to resemble the color of packaging bags made from unrecycled or virgin materials. Therefore, in the packaging bag 20 of the present disclosure, even if packaging bag remnants are used for the resin film that makes up the packaging bag 20, the packaging bag can be printed in a variety of colors according to the manufacturer's wishes.

Furthermore, the sanitary paper packaging 100 of the present disclosure is constructed by placing sanitary paper 11A in the packaging bag 20 described above, thereby achieving the same effects as the packaging bag 20 described above. In other words, in the sanitary paper packaging 100 of the present disclosure, the resin film that makes up the packaging bag 20 that packages the sanitary paper 11A contains components derived from leftover packaging bag materials, and the sanitary paper packaging 100 obtained by packaging sanitary paper 11A in such a resin film has a low environmental impact, is easy to open, and allows the sanitary paper to be easily removed.

Furthermore, in the sanitary paper packaging 100 disclosed herein, the remaining material from the packaging bag is scraps of the resin film used in the packaging bag, allowing the color of the packaging bag to be closer to the color of packaging bags made from unrecycled or virgin materials.

<Manufacturing method of packaging bags>
Fig. 6 is a flow chart for explaining some steps in a method for manufacturing a packaging bag. Fig. 7 is a diagram showing an original roll of resin film that constitutes a packaging bag. Fig. 8 is a diagram showing a state in which printing has been applied to the original roll of Fig. 7. Fig. 9 is a diagram showing a state in which the printed original roll of Fig. 8 has been cut. Fig. 10 is a flow chart for explaining some steps (production of resin film) in a method for manufacturing a packaging bag.

The manufacturing method for the packaging bag disclosed herein is a method for manufacturing the above-mentioned packaging bag, and includes a step of producing a raw sheet of resin film using leftover packaging bag material.

Specifically, as shown in FIG. 6, the method for manufacturing a packaging bag of the present disclosure includes a step of preparing a raw sheet of resin film (S1), a step of cutting the raw sheet (S2), a step of collecting leftover packaging bag materials (S3), and a step of preparing a raw sheet of resin film using the leftover materials (S4). Note that the step of preparing a raw sheet of resin film using the leftover materials is an example of a step of preparing a raw sheet of resin film using leftover packaging bag materials in the method for manufacturing a packaging bag of the present disclosure.

In the process (S1) of preparing a raw sheet of resin film, a raw sheet of resin film 1 in the form of a long roll is prepared. From the raw sheet of resin film 1 in the form of a long roll, multiple packaging bags, as described below, are obtained. As shown in Figure 7, the raw sheet of resin film 1 in the form of a long flat sheet is obtained by joining the ends of the long flat sheet of resin film in the width direction to form a cylindrical shape.

The obtained long roll of raw material 1 is then printed P in the area 2 that will later become the packaging bag (hereafter referred to as the printing area). Note that printing P is not printed in the area T that will later become the trim (hereafter referred to as the trim area).

In the process (S2) of cutting the raw material, the raw material 1, which is a long roll of resin film, is cut to a predetermined size. The raw material 1 is cut at predetermined intervals along cutting line C, as shown in Figure 8, while the long roll of raw material 1 is fed in a predetermined transport direction.

By cutting this raw material 1, multiple rolls of resin film 3 that make up the packaging bag are obtained, as shown in Figure 9. Furthermore, by cutting both ends of the raw material 1, scrap material 4 is obtained. Note that scrap material 4 is an example of a leftover material from a packaging bag in the manufacturing method of a packaging bag of the present disclosure. Scrap material 4 is also an example of a scrap material from a resin film used in a packaging bag in the manufacturing method of a packaging bag of the present disclosure.

The process (S4) of producing a raw sheet of resin film using leftover materials may include a known method for producing resin films. A typical resin film production flow will be described with reference to Figure 10. As shown in Figure 10, the process (S4, Figure 6) of producing a resin film using leftover materials may include producing leftover pellets from collected scrap material 4 (S41, Figure 10), melting the resin material containing the produced leftover pellets (S42, Figure 10), and forming it into a film (S43, Figure 10).

The production of waste pellets (Figure 10, S41) can also be done using known methods. For example, as shown in Figure 10, waste packaging bag materials (such as scraps) can be sorted and any foreign matter removed, then crushed and washed. The material can then be melted, formed into pellets, cooled, and dehydrated to obtain waste pellets.

In the process (S4) of producing a raw sheet of resin film using the remnants, the obtained remnant pellets can be used alone, in which case a resin film made from the remnants is produced. On the other hand, the remnant pellets can also be used together with, for example, unrecycled resin pellets (virgin resin pellets). In this case, the remnant pellets can be mixed with unrecycled resin pellets or unrecycled resin material in any ratio.

However, the greater the proportion of recyclable materials, the greater the proportion of recyclable materials, and from the perspective of realizing a sustainable society, it is preferable to have as high a proportion of recyclable materials as possible. For example, the proportion of components derived from packaging bag remnants in the recycled resin film may preferably be 20% by mass or more, and more preferably 30% by mass or more.

In addition, from the perspective of improving the strength of the resin film produced, it is preferable to use unrecycled resin material (virgin resin material) in the resin material melting process (Figure 10, S42). It is preferable to use materials derived from leftover materials (leftover pellets) in a proportion that keeps the strength of the resulting film to 10% or less, assuming the strength of a resin film produced from unrecycled resin material to be 100% (i.e., a proportion that ensures the strength of the resulting film is 90% or more). From this perspective, for example, the proportion of unrecycled resin material (virgin resin material) in the recycled resin film may preferably be 70% by mass or more, and more preferably 80% by mass or more.

For film molding (Figure 10, S43), known methods such as inflation, T-die, and extrusion molding can be used.

In the manufacturing method of the packaging bag disclosed herein, the above-mentioned packaging bag is obtained by carrying out a process of producing a raw roll of resin film using leftover packaging bag materials. In other words, in the manufacturing method of the packaging bag disclosed herein, leftover packaging bag materials are used for the resin film that makes up the packaging bag that packages sanitary paper. Therefore, by wrapping sanitary paper in such resin film, a packaging bag that has a low environmental impact, is easy to open, and allows the sanitary paper to be easily removed is obtained.

Furthermore, in the packaging bag manufacturing method disclosed herein, the remaining packaging bag material is scraps of the resin film used in the packaging bag, and by wrapping sanitary paper in resin film made from such scraps, packaging bags are obtained whose color is close to that of packaging bags made from unrecycled or virgin materials.

As described above, the manufacturing method for packaging bags disclosed herein includes the steps of preparing a raw roll (S1), cutting the raw roll (S2), collecting the remaining material (S3), and preparing a raw roll from the remaining material (S4), but these steps can be repeated as shown in Figure 6.

In this repeatable process, resin film made from leftover materials (recycled resin film) can be used from the second cycle of the process. This establishes a circular route for recycling resin materials. This will promote efforts to recycle materials in the field of sanitary paper and contribute to achieving the Sustainable Development Goals.

<Collective packaging bag>
11 is a diagram showing an example of leftover material from a collective packaging bag. The collective packaging bag of the present disclosure is used to package multiple pieces of sanitary paper. The multiple pieces of sanitary paper packaged in the collective packaging bag may be in the form of the sanitary paper package of the present disclosure described above, or may be rolls of sanitary paper that are not packaged in a packaging bag.

The collective packaging bag of the present disclosure is made of a resin film, and the resin film that constitutes the collective packaging bag contains components derived from leftover materials from the collective packaging bag. As a result, collective packaging bags made from such a resin film have a low environmental impact.

Furthermore, the resin film that makes up the collective packaging bag contains components derived from leftover materials from the collective packaging bag, so the load at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less. This type of resin film is difficult to stretch and is easy for the perforation blade to penetrate when forming the perforations for opening, so collective packaging bags made from this resin film have excellent openability.

In the collective packaging bag of the present disclosure, the components derived from the leftover materials of the collective packaging bag are not particularly limited, and examples include resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), and polyamide (PA). Furthermore, examples of polyethylene include high-density polyethylene and low-density polyethylene.

Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible and easy to handle, have excellent heat-sealing properties, and are inexpensive. Furthermore, polyethylene is preferred because it is odorless, has excellent water and chemical resistance, and can be mass-produced at low cost.

In addition, from the perspective of ensuring the stability of the resin film that makes up the collective packaging bag, it is preferable that the components derived from the leftover materials of the collective packaging bag be the same type as the components of the resin film that makes up the collective packaging bag. For example, if the resin film that makes up the collective packaging bag is made of polyethylene, it is preferable that the components derived from the leftover materials of the collective packaging bag also be polyethylene.

In the collective packaging bag disclosed herein, the collective packaging bag that is the source of the waste material is a collective packaging bag that packages multiple sanitary paper packages. Furthermore, the waste material from the collective packaging bag is preferably leftover material from the resin film used in the collective packaging bag and/or leftover material from the resin film used in the individual packaging bags made of resin film that package the sanitary paper.

The leftover resin film material used for the collective packaging bag is, for example, the trim 320 remaining after removing the portion 310 required for the packaging bag from the collective packaging bag material 300, as shown in Figure 11. Furthermore, the leftover resin film material used for the individual packaging bags made of resin film for packaging sanitary paper is, for example, the trim 220 of the packaging bag material 200 shown in Figure 5, as described above.

In the collective packaging bags disclosed herein, the remaining packaging bag material is scraps of the resin film used in the collective packaging bags, so there is little printed material in the remaining packaging bag material. Therefore, collective packaging bags made from resin film containing such scraps can have a color that is close to the color of collective packaging bags made from unrecycled or virgin materials.

As a result, even if the resin film that makes up the collective packaging bag contains components derived from leftover materials from the collective packaging bag, the collective packaging bag can be printed in a variety of colors according to the manufacturer's wishes. This will encourage the reuse of materials in the field of sanitary paper as well, and promote efforts to realize a sustainable society.

In the collective packaging bag of the present disclosure, as described above, the resin film that constitutes the collective packaging bag contains components derived from leftover materials from the collective packaging bag, which allows the load at 2% elongation in the TD direction to be 2.5 N or more and 7.0 N or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming the perforations for opening, so collective packaging bags made from such a resin film have even better openability.

In the collective packaging bag of the present disclosure, as described above, the resin film that constitutes the collective packaging bag contains components derived from leftover materials from the collective packaging bag, which can result in a tear strength in the MD direction of 700 mN or more and 2000 mN or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming perforations for opening, so collective packaging bags made from such a resin film have even better openability.

In the collective packaging bag of the present disclosure, as described above, the resin film that constitutes the collective packaging bag contains components derived from the leftover materials of the collective packaging bag, which can result in a tensile modulus in the MD direction of 150 MPa or more and 450 MPa or less. Because such a resin film easily maintains its shape, collective packaging bags made from such a resin film allow for stable storage of sanitary paper packages contained in the collective packaging bag.

In the collective packaging bag of the present disclosure, the resin film that constitutes the collective packaging bag contains components derived from the leftover materials of the collective packaging bag, as described above, which can result in a tensile modulus in the TD direction of 250 MPa or more and 500 MPa or less. Because such a resin film easily maintains its shape, collective packaging bags made from such a resin film can stably store sanitary paper packages contained in the collective packaging bag.

In the collective packaging bag of the present disclosure, the resin film that constitutes the collective packaging bag contains components derived from leftover materials from the collective packaging bag, as described above, which allows the tensile elongation in the MD direction to be 500% or more and 850% or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming perforations for opening, so collective packaging bags made from such a resin film have even better openability.

In the collective packaging bag of the present disclosure, the resin film that makes up the collective packaging bag contains components derived from the leftover materials of the collective packaging bag, as described above, which can result in a tensile strength in the MD direction of 10 N/cm or more and 30 N/cm or less. Such resin films are even more likely to retain their shape, so collective packaging bags made from such resin films can stably store sanitary paper packages contained in the collective packaging bag.

In the collective packaging bag disclosed herein, the resin film that makes up the collective packaging bag contains 2% by mass or more of components derived from the leftover materials of the collective packaging bag, which ensures that the resin film that makes up the collective packaging bag is less likely to stretch, allowing collective packaging bags with excellent openability to be obtained with high precision.

As described above, in the collective packaging bag of the present disclosure, the content of printing components in the components derived from the leftover materials of the collective packaging bag is 0.2% by mass or less, so even if the components derived from the leftover materials of the collective packaging bag contain printing components, the color of the collective packaging bag can be made to approximate the color of packaging bags made from unrecycled materials or virgin materials. Therefore, the collective packaging bag of the present disclosure can be printed in a variety of colors according to the manufacturer's wishes.

<Manufacturing method of collective packaging bag>
12 is a diagram showing an original roll of resin film that constitutes the collective packaging bag. The manufacturing method of the collective packaging bag of the present disclosure is a method for manufacturing the collective packaging bag described above, and includes a step of producing the collective packaging bag using leftover material from the collective packaging bag.

Specifically, collective packaging bags can be manufactured in the same manner as the manufacturing method for packaging bags shown in Figures 6 to 10. Note that in the manufacturing method for collective packaging bags of the present disclosure, points that are common to the manufacturing method for packaging bags described above are designated by the same or corresponding reference numerals, and descriptions thereof will be omitted.

As shown in Figure 6, the method for manufacturing a collective packaging bag of the present disclosure includes the steps of producing a raw roll of resin film (S1), cutting the raw roll (S2), collecting leftover materials from collective packaging bags (S3), and producing a raw roll of resin film using the leftover materials (S4). Steps S1 to S4 shown in Figure 6 are an example of the steps for producing collective packaging bags using leftover materials from collective packaging bags in the method for manufacturing a collective packaging bag of the present disclosure.

Furthermore, as shown in FIG. 9, scrap material 4 is an example of a leftover material from a collective packaging bag in the manufacturing method of a collective packaging bag of the present disclosure. Scrap material 4 is also an example of a scrap material from a resin film used in a collective packaging bag and/or a scrap material from a resin film used in an individual packaging bag in the manufacturing method of a collective packaging bag of the present disclosure.

In the process (S1) of preparing a raw sheet of resin film, a long roll of raw resin film 5 is wound into a roll, as shown in Figure 12. The long roll of raw resin film 5 is folded into a gusset shape. Handles 6 are provided at predetermined intervals on the raw sheet 5.

In the process of cutting the raw roll (S2), the wound raw roll 5 is pulled out and cut at predetermined intervals.

The process (S3) of collecting the remaining material from the collective packaging bag and the process (S4) of using the remaining material to produce a roll of resin film are the same as for the packaging bag described above.

In the method for manufacturing a collective packaging bag disclosed herein, the above-mentioned collective packaging bag is obtained by carrying out a process of producing a collective packaging bag using leftover materials from collective packaging bags. In other words, in the method for manufacturing a collective packaging bag disclosed herein, the resin film that makes up the collective packaging bag that packages multiple pieces of sanitary paper contains components derived from the leftover materials from collective packaging bags, and by wrapping multiple pieces of sanitary paper in such a resin film, a collective packaging bag that has a low environmental impact and is easy to open is obtained.

Furthermore, in the manufacturing method of the collective packaging bag disclosed herein, the leftover material from the collective packaging bag is scraps of the resin film used for the collective packaging bag and/or scraps of the resin film used for the individual packaging bags. By wrapping multiple pieces of sanitary paper in resin film made from such scraps, collective packaging bags can be obtained whose color is close to that of collective packaging bags made from unrecycled or virgin materials.

Furthermore, the manufacturing method of the collective packaging bag of the present disclosure may be in a form that does not use the original roll of resin film that makes up the collective packaging bag, as shown below. Figure 13 is a flow diagram of a manufacturing method of a sanitary paper packaging body that includes a manufacturing method of a collective packaging bag. Figure 14 is a flow diagram for explaining a part of the process (production of the resin film) of a manufacturing method of a sanitary paper packaging body that includes a manufacturing method of a collective packaging bag.

As shown in FIG. 13, the method for manufacturing sanitary paper packaging, including the method for manufacturing collective packaging bags, includes a step of manufacturing sanitary paper (S10), a step of packaging the manufactured sanitary paper in packaging material including a resin film (S20), a step of collecting leftover materials from the collective packaging bags (S30), and a step of manufacturing packaging material including a resin film using the leftover materials (S40). Note that the step of manufacturing packaging material including a resin film using the leftover materials (S40) is an example of a step of manufacturing collective packaging bags using leftover materials from collective packaging bags in the method for manufacturing collective packaging bags of the present disclosure.

The sanitary paper manufacturing process (S10) can use known manufacturing methods for producing the desired sanitary paper.

As shown in Figure 14, the process of packaging sanitary paper (S20) may include, for example, a process of forming a long, tubular packaging bag precursor from a packaging material containing a resin film (S21), a process of placing sanitary paper inside the packaging precursor (S22), and a process of cutting and joining the packaging bag precursor at a position where there is no sanitary paper (S23).

More specifically, the process of packaging sanitary paper (S20) involves preparing a long piece of resin film (packaging material) that will later become the packaging bag 20, and forming a resin film precursor (Figure 14, S21). The resin film precursor is fed in a predetermined transport direction, and can be obtained by joining the ends of the long piece of resin film together in the width direction to form a cylindrical shape.

Alternatively, the resin film precursor may not be a flat sheet-like resin film, but may be a resin film formed into a long cylindrical shape. The long cylindrical resin film precursor can be transported by a conveying section (not shown) with the portion corresponding to the gusset (or gusset) of the packaging bag pre-folded inward, or it can be wound up in this state beforehand onto a roll and provided to the production line, from which it can be unwound into the conveying section.

Next, sanitary paper is placed inside the packaging bag precursor (Figure 14, S22). When placing, multiple pieces of sanitary paper can be placed (or stuffed) into the open side of the packaging bag precursor. At this time, air or the like can be blown into the flattened packaging bag precursor to create an opening large enough for the sanitary paper to pass through.

At least after the sanitary paper has been placed inside, the packaging bag precursor is cut in a direction perpendicular to the predetermined conveying direction at a position where there is no sanitary paper, and then joined to obtain a sealed packaging bag (Figure 14, S23). When cutting, any packaging material scraps (also called trim) are cut off. In this specification, packaging material scraps are an example of packaging material remnants.

Heat sealing, ultrasonic sealing, adhesives, etc. can be used to join resin films together. Of these, heat sealing is preferred because it is a less complicated operation and can form a more reliable bond.

The joining and cutting of the packaging bag precursor (Figure 14, S23) can be performed by joining and/or cutting sections (not shown) that are arranged above and below the packaging bag precursor and are capable of applying pressure and/or heat in the vertical direction (thickness direction). The joining and/or cutting sections may be, for example, members that are arranged above and below the packaging bag precursor and are capable of applying pressure and/or heat in the vertical direction (thickness direction). The joining and/or cutting sections may be integrated with each other, or may include joining and cutting sections that can be moved separately from each other. Therefore, the joining and cutting of the packaging bag 20 may be performed simultaneously or at different times.

Before the sanitary paper is placed inside, the packaging bag precursor is cut and joined upstream of the sanitary paper to form a packaging bag precursor with one end joined and the other end open. After the sanitary paper is placed inside, the cutting and joining are performed downstream of the placed sanitary paper. However, the timing of the joining and cutting is not limited to this method. For example, when using pillow packaging such as that described above, the packaging bag precursor can be cut and joined in the order downstream and upstream after the sanitary paper is placed inside.

In this way, through steps S21 to S23, multiple sheets of sanitary paper can be wrapped and sealed in packaging material containing a resin film.

In this disclosure, furthermore, leftover materials generated during the process (S20) of wrapping the above-mentioned sanitary paper in packaging material are collected (S30) and utilized. Note that, in this specification, the concept of leftover materials may include scraps generated during the cutting and joining process (S23) as described above, as well as defective products, including resin film portions that are not included in the finished packaging bag, packaging bag precursor portions, and packaging bags, for example, portions that did not become a product due to missing print, etc.

In order to recycle resin film, one possibility would be to collect packaging bags for sanitary paper that have already been used by users and attempt to create resin film from them. However, the exterior of the packaging bags is usually printed entirely to prevent the sanitary paper contained inside from being seen from the outside and to protect the sanitary paper from the effects of light such as ultraviolet rays. Therefore, if packaging bags are collected and resin film is recycled, the color of the recycled resin film will be heavily dependent on the original packaging bag, making it difficult to print the recycled resin film in the desired color.

In contrast, leftover materials have less printing or many unprinted areas compared to the packaging bags in the finished product (sanitary paper packaging). Therefore, when using leftover materials to create a new resin film according to this embodiment, that is, when creating a resin film containing components derived from leftover materials, it is possible to obtain a resin film with a color (white, milky white, transparent, etc.) close to the color of resin film created from unrecycled materials (virgin materials).

According to this embodiment, recycled resin film can be printed in a variety of colors as desired. This increases the degree of freedom in the configuration and design of packaging bags made from recycled resin film, promoting the reuse of packaging bags made from resin film and ultimately encouraging efforts in this field to achieve a sustainable society.

Furthermore, according to the manufacturing method of this embodiment, the recycled resin film uses materials collected in the production of sanitary paper packaging, so it can be a resin film with fewer contaminants than when the packaging bags left over after the sanitary paper has been removed from the consumer are collected and reused. Alternatively, when producing the resin film, it is possible to eliminate or reduce the need for refining processes such as removing foreign matter.

The collection of packaging bag residue (S30) includes separating and collecting the residue from the product, and may be done using a dedicated device or by hand. The packaging bag residue collected in step S30 may be generated at any stage in the process of wrapping sanitary paper in packaging material (S20), but is preferably scrap material generated in the process of cutting and joining the packaging bag precursor at a location where there is no sanitary paper (S23).

As mentioned above, packaging bag remnants include scraps and other scraps generated in the cutting and joining process (S23) of the packaging bag precursor, but it is preferable that the packaging bag remnants contain at least a large amount of resin film scraps, and it is even more preferable that they are resin film scraps.

The packaging bag 20 for sanitary paper is usually printed all over. Such printing can be applied in advance, for example, to the resin film that is the packaging material used to later form the packaging bag 20. The printing may also include product information (not shown) detailing the sanitary paper that is contained within.

The printed portions of the packaging bag precursor are printed areas (not shown) that are entirely printed (have printed areas entirely) in the portions that will later become packaging bag 20 (portions that will later constitute packaging bag 20), but the areas between the portions that will later become packaging bag 20 are inter-printed areas that are not printed or are entirely unprinted (do not have printed areas or are entirely free of printed areas). In other words, the packaging bag precursor has printed areas and inter-printed areas alternating in the longitudinal direction (conveyance direction).

In the cutting and joining step (S23), the packaging bag precursor can be cut at a position within the area between the printed areas, specifically at the planned cutting positions. The area between the planned cutting positions is the planned scrap area that will become scrap after the cutting and joining step (S23). As mentioned above, the area between the printed areas is an area with significantly fewer printed areas or no printed areas compared to the printed areas that will later form the packaging bag 20, so the planned scrap area, and therefore the resulting scrap, will also be an area with significantly fewer printed areas or no printed areas compared to the printed areas.

In the process (S40) of producing a resin film using the remaining material, the resin film can be produced by applying some of the steps (production of resin film) of the packaging bag manufacturing method shown in Figure 10 above.

The process includes a step (S20) of packaging the produced sanitary paper in packaging material containing resin film, a step (S30) of collecting the remaining material, and a step (S40) of producing packaging material containing resin film using the remaining material. This series of steps can be repeated as shown in Figure 13. From the second round of this repeatable series of steps, resin film made from the remaining material (recycled resin film) can be used. This makes it possible to establish a circular route for recycling resin materials. This will promote material recycling efforts in this field and contribute to achieving the Sustainable Development Goals.

As described above, the manufacturing method for collective packaging bags disclosed herein includes a step of producing collective packaging bags using leftover materials from collective packaging bags. This means that the resin film that makes up the packaging bags used to package sanitary paper contains components derived from the leftover materials from the collective packaging bags. Therefore, by wrapping multiple pieces of sanitary paper in such resin film, collective packaging bags that have a low environmental impact and are easy to open can be obtained.

Furthermore, the manufacturing method for collective packaging bags disclosed herein includes a step of producing collective packaging bags using leftover materials from collective packaging bags. By packaging multiple pieces of sanitary paper in collective packaging bags made from such leftover materials, collective packaging bags whose color is close to that of packaging bags made from unrecycled or virgin materials can be obtained.

The present invention will now be described in further detail using examples. The examples and comparative examples were evaluated using the following tests. Note that "%" is by mass unless otherwise specified.

[Hygienic paper packaging and packaging bags]
As shown in Figures 1 and 2, a sanitary paper package was prepared in which a sanitary paper laminate (manufactured by Daio Paper Co., Ltd., Ina Soft Pack Tissue 150 sets) consisting of multiple sets of two-ply tissue paper stacked in a pop-up style was placed in a resin film packaging bag with a take-out opening on the top surface. Polyethylene was used as the resin film constituting the packaging bag. In this example, scraps of the resin film used in the polyethylene film packaging bag were mixed into the resin film constituting the packaging bag as leftover material.

[Thickness of packaging bag]
The thickness of the packaging bag was measured using a thickness measuring device (PEACOCK Dial Thickness Gauge G-1A, manufactured by Ozaki Seisakusho Co., Ltd.) by measuring the thickness of three points of the packaging bag six times each, and the average value was calculated as the paper thickness.

[Tensile strength of packaging bag]
The tensile strength of the packaging bag was measured in accordance with the provisions of JIS P 7127 (1999). The unit of tensile strength is N/cm. Measurements were made five times in each of the MD and CD directions, and the average of the measured values was used as the tensile strength in each direction.

[Tensile elongation of packaging bag]
The tensile elongation of the packaging bag was measured in accordance with the provisions of JIS P 7127 (1999). The unit of tensile elongation is %. Measurements were made five times in each of the MD and CD directions, and the average of the measured values was used as the tensile elongation in each direction.

[Load at 2% elongation of packaging bag]
The load at 2% elongation of the packaging bag was measured in accordance with the provisions of JIS P 7127 (1999). The unit of the load at 2% elongation is N/20 cm. Measurements were made five times in each of the MD and CD directions, and the average of the measured values was used as the load at 2% elongation in each direction.

[Tensile modulus of packaging bag]
The tensile modulus of the packaging bag was measured in accordance with the provisions of JIS P 7127 (1999). The unit of tensile modulus is MPa. Measurements were made five times in each of the MD and CD directions, and the average of the measured values was used as the tensile modulus in each direction.

[Tear strength of packaging bag]
The tear strength of the packaging bag was measured in accordance with the provisions of JIS P 7128-2 (1998). The unit of tear strength is mN. Measurements were made five times in each of the MD and CD directions, and the average of the measured values was taken as the tear strength in each direction.

[HAZE of packaging bag]
The haze of the packaging bag was measured in accordance with the provisions of JIS K 7136 (2000). Haze is an index that indicates the degree of cloudiness (or the degree of light diffusion) of a substance, and is expressed in %. Measurements were taken five times, and the average of the measured values was taken as the haze. A haze of 12% or less was evaluated as good, and a haze of more than 12% was evaluated as poor.

[Glossiness of packaging bag]
The glossiness of the packaging bag was measured in accordance with the provisions of JIS P 8142 (2005). Glossiness is an index of glossiness, expressed in units of %, which is the ratio of the intensity of incident light to that of specularly reflected light when an object is irradiated with light. Measurements were made five times, and the average of the measured values was taken as the glossiness. A glossiness of 100% or more was evaluated as good, and a glossiness of less than 100% was evaluated as poor.

[Openability]
The openability of the packaging bag was checked. To check the openability, 10 mm of the left end of the opening was opened, a clip (25 mm double clip, manufactured by Kokuyo Co., Ltd.) was clamped there, an attachment was attached to a push-pull gauge (Z2-20N, manufactured by IMADA Co., Ltd.), the clip was hooked onto the attachment, and the opening strength was measured when it was pulled up at a 45° angle at a speed of 150 mm/sec. The unit of opening strength is N. Five measurements were taken, and the average of the measured opening strength values was taken as the openability. An opening strength of 1.5 N or more and less than 1.9 N was evaluated as excellent, 1.3 N or more and less than 1.5 N or 1.9 N or more and less than 2.1 N was evaluated as good, and all other cases were evaluated as poor.

[Pop-up]
The degree of sagging of the sanitary paper was checked when the sanitary paper was pulled out from the first set to the last set of sanitary paper in the sanitary paper package. Evaluation was based on the following criteria: 0 to 5 saggings were rated as good, and 6 to 10 saggings were rated as bad.

[Drawability]
An attachment was attached to a push-pull gauge (IMADA, Z2-20N), a clip (KOKUYO, double clip, 25 mm) was attached to the attachment, and the central 10 mm of each sanitary tissue was clamped with the clip. The first set of tissue was pulled out, and the pull-out strength of the second to fifth sets was measured for five samples. The pull-out strength is measured in N. The tissue was pulled perpendicular to the top surface of the packaging bag, and the pulling speed was 230 mm/sec. The pull-out strength was the maximum value until the tissue was released from the packaging bag. The pull-out properties were evaluated as excellent when the pull-out strength was less than 1.5 N, good when it was 1.5 N or more but less than 2.0 N, and poor when it was 2.0 N or more.

[Appearance of packaging bag]
A sensory evaluation was conducted by 10 subjects, and the appearance of the packaging bag was evaluated based on whether foreign matter was noticeable or not, compared to a conventional product (Comparative Example 1). The appearance was evaluated as excellent when 0 subjects were bothered by foreign matter, good when 1 to 5 subjects were bothered by foreign matter, and poor when 6 or more subjects were bothered by foreign matter.

[Environmental friendliness of packaging bags]
The environmental friendliness of the packaging bags was evaluated. The environmental friendliness was evaluated as excellent when the content of the remaining material of the packaging bag in the resin film constituting the packaging bag was more than 10%, good when it was more than 0% and 10% or less, and poor when it was 0%.

The following describes examples and comparative examples.

[Example 1]
A sanitary paper package was produced and evaluated. The packaging bag contained 5% resin film scraps, had a thickness of 40 μm, a tensile strength of 18.5 N/cm in the MD direction and 19.0 N/cm in the TD direction, a tensile elongation of 640% in the MD direction and 780% in the TD direction, a load at 2% elongation of 3.69 N/20 cm in the MD direction and 4.42 N/20 cm in the TD direction, a tensile modulus of 279 MPa in the MD direction and 349 MPa in the TD direction, and a tear strength of 1352 mN in the MD direction and 11072 mN in the TD direction. The results are shown in Table 1.

[Example 2]
The proportion of resin film scraps used in the packaging bag without printed components was 20%, the tensile strength was 19.4 N/cm in the MD direction and 19.4 N/cm in the TD direction, the tensile elongation was 655% in the MD direction and 755% in the TD direction, the load at 2% elongation was 3.70 N/20 cm in the MD direction and 4.42 N/20 cm in the TD direction, the tensile modulus was 271 MPa in the MD direction and 341 MPa in the TD direction, and the tear strength was 1,440 mN in the MD direction and 11,520 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 3]
The proportion of resin film scraps used in the packaging bag without printed components was 25%, the tensile strength was 19.6 N/cm in the MD direction and 19.7 N/cm in the TD direction, the tensile elongation was 656% in the MD direction and 746% in the TD direction, the load at 2% elongation was 3.75 N/20 cm in the MD direction and 4.48 N/20 cm in the TD direction, the tensile modulus was 273 MPa in the MD direction and 344 MPa in the TD direction, and the tear strength was 1444 mN in the MD direction and 11776 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 4]
The proportion of scraps of the resin film used in the packaging bag was 3%, the proportion of printed components (components other than polyethylene) contained in the scraps (hereinafter referred to as the scrap printing proportion) was 0.9%, and the proportion of printed components in the entire resin film making up the packaging bag (hereinafter referred to as the scrap printing proportion/entire film) was 0.03%. The tensile strength was 17.2 N/cm in the MD direction and 16.6 N/cm in the TD direction, the tensile elongation was 714% in the MD direction and 728% in the TD direction, the load at 2% elongation was 4.39 N/20 cm in the MD direction and 5.60 N/20 cm in the TD direction, the tensile modulus was 370 MPa in the MD direction and 479 MPa in the TD direction, and the tear strength was 1157 mN in the MD direction and 11000 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Example 5]
The proportion of resin film scraps used in the packaging bag was 5%, the scrap printing ratio/total film was 0.05%, the tensile strength was 17.4 N/cm in the MD direction and 17.0 N/cm in the TD direction, the tensile elongation was 668% in the MD direction and 714% in the TD direction, the load at 2% elongation was 4.60 N/20 cm in the MD direction and 5.62 N/20 cm in the TD direction, the tensile modulus was 376 MPa in the MD direction and 468 MPa in the TD direction, and the tear strength was 1068 mN in the MD direction and 11200 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 4. The results are shown in Table 1.

[Example 6]
The proportion of resin film scraps used in the packaging bag was 10%, the scrap printing ratio/total film was 0.09%, the tensile strength was 17.6 N/cm in the MD direction and 17.3 N/cm in the TD direction, the tensile elongation was 621% in the MD direction and 700% in the TD direction, the load at 2% elongation was 4.82 N/20 cm in the MD direction and 5.64 N/20 cm in the TD direction, the tensile modulus was 383 MPa in the MD direction and 457 MPa in the TD direction, and the tear strength was 979 mN in the MD direction and 11,800 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 4. The results are shown in Table 1.

[Example 7]
The thickness was 35 μm (the 35 μm thickness was assumed to be the thickness of a collective packaging bag), the tensile strength was 16.6 N/cm in the MD direction and 16.9 N/cm in the TD direction, the tensile elongation was 605% in the MD direction and 780% in the TD direction, the load at 2% elongation was 3.25 N/20 cm in the MD direction and 3.82 N/20 cm in the TD direction, the tensile modulus was 241 MPa in the MD direction and 316 MPa in the TD direction, and the tear strength was 1144 mN in the MD direction and 10688 mN in the TD direction. Other than that, a sanitary paper package was produced and evaluated in the same manner as in Example 2. The results are shown in Table 1.

[Example 8]
The proportion of resin film scraps used in the packaging bag was 25%, the scrap printing ratio/total film was 0.23%, the tensile strength was 18.0 N/cm in the MD direction and 17.8 N/cm in the TD direction, the tensile elongation was 550% in the MD direction and 678% in the TD direction, the load at 2% elongation was 5.13 N/20 cm in the MD direction and 5.68 N/20 cm in the TD direction, the tensile modulus was 392 MPa in the MD direction and 440 MPa in the TD direction, and the tear strength was 845.5 mN in the MD direction and 12,000 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 4. The results are shown in Table 1.

[Comparative Example 1]
The resin film constituting the packaging bag did not contain any remnants of the resin film used in the packaging bag (the proportion of remnants of the resin film used in the packaging bag was 0%), and the tensile strength was 18.5 N/cm in the MD direction and 18.4 N/cm in the TD direction, the tensile elongation was 650% in the MD direction and 790% in the TD direction, the load at 2% elongation was 3.52 N/20 cm in the MD direction and 4.18 N/20 cm in the TD direction, the tensile modulus was 265 MPa in the MD direction and 331 MPa in the TD direction, and the tear strength was 1,424 mN in the MD direction and 11,072 mN in the TD direction. Otherwise, a sanitary paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 2]
The resin film constituting the packaging bag did not contain any remnants of the resin film used in the packaging bag (the proportion of remnants of the resin film used in the packaging bag was 0%), and the tensile strength was 16.9 N/cm in the MD direction and 17.0 N/cm in the TD direction, the tensile elongation was 610% in the MD direction and 765% in the TD direction, the load at 2% elongation was 3.19 N/20 cm in the MD direction and 3.75 N/20 cm in the TD direction, the tensile modulus was 227 MPa in the MD direction and 311 MPa in the TD direction, and the tear strength was 1128 mN in the MD direction and 10240 mN in the TD direction. Otherwise, a sanitary paper package was prepared and evaluated in the same manner as in Example 7. The results are shown in Table 1.

Table 1 shows that in Examples 1 to 8, the sanitary paper packaging used in these bags, in which the resin film constituting the packaging bag contained components derived from leftover packaging bag materials and the load at 2% elongation in the MD direction was 2.5 N or more and 6.5 N or less, was environmentally friendly. Furthermore, compared to the sanitary paper packaging of Comparative Examples 1 and 2 (conventional sanitary paper packaging), the haze, gloss, and openability were good.

Furthermore, in Examples 1 to 7, sanitary paper packages using packaging bags in which the content of printing components in the components derived from waste materials was 0.2% by mass or less had even better appearance and were easier to pop up and pull out.

Furthermore, in Examples 2 and 3, the sanitary paper packaging in which the content of components derived from waste materials in the resin film that makes up the packaging bag was 20% by mass or more was found to be highly environmentally friendly.

The embodiments disclosed above include, for example, the following aspects:

The first aspect of this embodiment is a packaging bag made of a resin film for packaging sanitary paper, wherein the resin film contains components derived from the waste material of the packaging bag, and the load of the resin film at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less.

In this specification, the MD direction of a resin film refers to the direction in which the resin that makes up the resin film flows. The load at 2% elongation of a resin film is a value measured in accordance with JIS K 7127 (1999), and indicates the load when the distance between two benchmark lines on the resin film is elongated by 2% from its original level.

In the first aspect, the resin film that makes up the packaging bag used to package sanitary paper contains components derived from the packaging bag, meaning that packaging bags made from such a resin film have a low environmental impact.

Furthermore, in the first aspect, the resin film that constitutes the packaging bag contains components derived from leftover packaging bag materials, so that the load at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less. Such a resin film is difficult to stretch and is easy for a perforation blade to penetrate when forming perforations for opening, so packaging bags made from such a resin film have excellent openability. Furthermore, by constructing packaging bags from such a resin film, the amount of lubricant used can be reduced.

A second aspect of this embodiment is the packaging bag described in the first aspect, in which the remnant material is a scrap of resin film used in the packaging bag. Resin film packaging bags used to package sanitary paper are typically printed, but the scrap of resin film used in the packaging bag is the cut position and surrounding area of the resin film used in the packaging bag, so it is not printed, or at least not printed overall like the part that will become the packaging bag.

In the second aspect, the remaining packaging bag material is scraps of the resin film used in such packaging bags, and therefore the amount of printed components in the remaining packaging bag material is small. Therefore, in packaging bags made from resin film containing such scraps, the color of the packaging bag can be made closer to the color of packaging bags made from unrecycled or virgin materials.

Therefore, in the second aspect, even if the resin film that makes up the packaging bag contains components derived from packaging bag waste, the packaging bag can be printed in a variety of colors according to the manufacturer's wishes. This encourages the reuse of materials, even in the field of sanitary paper, and promotes efforts to realize a sustainable society.

A third aspect of this embodiment is a packaging bag according to the first or second aspect, in which the load at 2% elongation in the TD direction of the resin film constituting the packaging bag is 2.5 N or more and 7.0 N or less. In this specification, the TD direction of the resin film refers to the direction perpendicular to the MD direction (the flow direction of the resin constituting the resin film).

In the third aspect, as described above, the resin film that constitutes the packaging bag contains components derived from the remaining packaging bag material, so that the load at 2% elongation in the TD direction can be 2.5 N or more and 7.0 N or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming the perforations for opening, so packaging bags made from such a resin film have even better openability.

A fourth aspect of this embodiment is a packaging bag according to any one of the first to third aspects, in which the tear strength in the MD direction of the resin film constituting the packaging bag is 700 mN or more and 2000 mN or less. In this specification, the tear strength of the resin film is a numerical value measured in accordance with JIS K 7128-2 (1998) and indicates the strength when the resin film is torn.

In the fourth aspect, as described above, the resin film that constitutes the packaging bag contains components derived from leftover packaging bag materials, which can result in a tear strength in the MD direction of 700 mN or more and 2000 mN or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming perforations for opening, so packaging bags made from such a resin film have even better openability.

A fifth aspect of this embodiment is a packaging bag according to any one of the first to fourth aspects, in which the tensile modulus of elasticity in the MD direction of the resin film constituting the packaging bag is 150 MPa or more and 450 MPa or less. In this specification, the tensile modulus of elasticity of the resin film is a value measured in accordance with JIS K 7127 (1999), and indicates the ratio of the tensile stress per unit cross-sectional area of the resin film to the strain generated in the stress direction.

In the fifth aspect, as described above, the resin film that makes up the packaging bag contains components derived from the packaging bag's leftover material, which can result in a tensile modulus in the MD direction of 150 MPa or more and 450 MPa or less. Because such a resin film easily maintains its shape, packaging bags made from such a resin film allow the sanitary paper contained in the packaging bag to be removed one sheet at a time, resulting in excellent sanitary paper removal properties.

A sixth aspect of this embodiment is a packaging bag according to any one of the first to fifth aspects, in which the resin film constituting the packaging bag has a tensile modulus in the TD direction of 250 MPa or more and 550 MPa or less.

In the sixth aspect, as described above, the resin film that makes up the packaging bag contains components derived from the packaging bag's leftover material, which can result in a tensile modulus in the TD direction of 250 MPa or more and 500 MPa or less. Because such a resin film easily maintains its shape, packaging bags made from such a resin film have excellent ease of removal of sanitary paper.

A seventh aspect of this embodiment is a packaging bag according to any one of the first to sixth aspects, in which the resin film constituting the packaging bag has a tensile elongation in the MD direction of 500% or more and 850% or less. In this specification, the tensile elongation of the resin film is a numerical value measured in accordance with JIS K 7127 (1999), and indicates the percentage of elongation until the resin film breaks when pulled at a predetermined speed.

In the seventh aspect, as described above, the resin film that constitutes the packaging bag contains components derived from leftover packaging bag materials, which allows the tensile elongation in the MD direction to be 500% or more and 850% or less. Such a resin film is even less likely to stretch, making it easier for the perforation blade to penetrate when forming perforations for opening, so packaging bags made from such a resin film have even better openability.

An eighth aspect of this embodiment is a packaging bag according to any one of the first to seventh aspects, in which the tensile strength in the MD direction of the resin film constituting the packaging bag is 10 N/cm or more and 30 N/cm or less. In this specification, the tensile strength of the resin film is a numerical value measured in accordance with JIS K 7127 (1999) and indicates the force when the resin film is pulled until it breaks.

In the eighth aspect, as described above, the resin film that makes up the packaging bag contains components derived from packaging bag remnants, which can result in a tensile strength in the MD direction of 10 N/cm or more and 30 N/cm or less. Because such a resin film is more likely to retain its shape, packaging bags made from such a resin film can improve the ease of removing sanitary paper.

A ninth aspect of this embodiment is the packaging bag according to any one of the first to eighth aspects, in which the content of components derived from the waste material in the resin film constituting the packaging bag is 2% by mass or more. In the ninth aspect, by containing 2% by mass or more of components derived from the waste material of the packaging bag in the resin film constituting the packaging bag, the resin film constituting the packaging bag is reliably less likely to stretch, and packaging bags with excellent openability can be obtained with high precision.

A tenth aspect of this embodiment is the packaging bag according to any one of the first to ninth aspects, in which the content of printing components in the components derived from the waste material is 0.2 mass% or less. In this specification, printing components refers to components that were used to print the resin film contained in the waste material of the packaging bag.

In the tenth aspect, by limiting the content of printing components in the components derived from packaging bag remnants to 0.2% by mass or less, even if the components derived from packaging bag remnants contain printing components, the color of the packaging bag can be made to approximate the color of packaging bags made from unrecycled or virgin materials. Therefore, in the tenth aspect, even if packaging bag remnants are used for the resin film that makes up the packaging bag, the packaging bag can be printed in a variety of colors according to the manufacturer's wishes.

An eleventh aspect of this embodiment is a sanitary paper package comprising the packaging bag described in any one of the first to tenth aspects and sanitary paper contained in the packaging bag. In the eleventh aspect, by constructing a sanitary paper package in which sanitary paper is contained in the above-mentioned packaging bag, the same effects as the above-mentioned packaging bag can be obtained.

In other words, in the eleventh aspect, the resin film that makes up the packaging bag used to package sanitary paper contains components derived from leftover packaging bag materials, and the sanitary paper package obtained by packaging sanitary paper in such a resin film has a low environmental impact, is easy to open, and allows the sanitary paper to be easily removed.

Furthermore, in the eleventh aspect, the leftover material from the packaging bag is scrap material from the resin film used in the packaging bag, and in the sanitary paper package obtained by wrapping sanitary paper in resin film made from such leftover material from the packaging bag, the color of the packaging bag can be made closer to the color of packaging bags made from unrecycled or virgin materials.

A twelfth aspect of the present invention is a method for manufacturing a packaging bag according to any one of the first to tenth aspects, which includes a step of producing a raw sheet of the resin film using leftover material from the packaging bag.

In the twelfth aspect, the above-mentioned packaging bag is obtained by carrying out a process of producing a raw roll of resin film using leftover packaging bag materials. In other words, in the twelfth aspect, leftover packaging bag materials are used for the resin film that makes up the packaging bag that packages sanitary paper. Therefore, by wrapping sanitary paper in such resin film, a packaging bag that has a low environmental impact, is easy to open, and allows the sanitary paper to be easily removed is obtained.

In addition, in the twelfth aspect, the remaining material of the packaging bag is a scrap of the resin film used for the packaging bag, and when sanitary paper is wrapped in a resin film made from such scrap material, the color of the packaging bag is close to the color of a packaging bag made from unrecycled or virgin materials.

A thirteenth aspect of the present invention is a collective packaging bag made of a resin film for packaging multiple pieces of sanitary paper, wherein the resin film contains components derived from leftover materials from the collective packaging bag, and the load at 2% elongation in the MD direction of the resin film is 2.0 N or more and 6.5 N or less.

In the thirteenth aspect, the resin film that constitutes the collective packaging bag contains components derived from leftover materials from the collective packaging bag, so that collective packaging bags made with such resin film have a low environmental impact.

In addition, in a thirteenth aspect, the resin film constituting the collective packaging bag contains components derived from leftover materials from the collective packaging bag, so that the load at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less. Such a resin film is difficult to stretch and is easy for a perforation blade to penetrate when forming perforations for opening, so collective packaging bags made from such a resin film have excellent openability. Furthermore, by constructing collective packaging bags from such a resin film, the amount of lubricant used can be reduced.

A fourteenth aspect of the present invention is the collective packaging bag according to the thirteenth aspect, in which the remnants are scraps of resin film used in the collective packaging bag and/or scraps of resin film used in the individual packaging bags made of resin film for packaging the sanitary paper. Collective packaging bags made of resin film for packaging multiple pieces of sanitary paper and individual packaging bags made of resin film for packaging sanitary paper are typically printed, but the scraps of resin film used in the collective packaging bag and the individual packaging bags are the cutting positions and surrounding areas of the resin film used in the collective packaging bag and the individual packaging bags, and therefore are not printed, or at least not printed overall like the parts that become the collective packaging bag or the individual packaging bags.

In the fourteenth aspect, the leftover material from the collective packaging bag is leftover resin film used in such collective packaging bag and/or leftover resin film used in the individual packaging bags, and thus the collective packaging bag made from resin film using such leftover material can have a color that is closer to the color of collective packaging bags made from unrecycled or virgin materials.

A fifteenth aspect of the present invention is a method for manufacturing a collective packaging bag according to the thirteenth or fourteenth aspect, which includes a step of producing the collective packaging bag using leftover material from the collective packaging bag.

In a fifteenth aspect, the above-mentioned collective packaging bag is obtained by carrying out a process of producing a collective packaging bag using leftover materials from collective packaging bags. That is, in a sixteenth aspect, the resin film that constitutes the collective packaging bag that packages multiple pieces of sanitary paper contains components derived from the leftover materials from collective packaging bags, and by wrapping multiple pieces of sanitary paper in such a resin film, a collective packaging bag that has a low environmental impact and is easy to open is obtained.

In addition, in a fifteenth aspect, the leftover material from the collective packaging bag is scraps of resin film used in the collective packaging bag and/or scraps of resin film used in the individual packaging bags, and by wrapping multiple pieces of sanitary paper in resin film made from such scraps, collective packaging bags whose color is close to that of collective packaging bags made from unrecycled or virgin materials can be obtained.

Although the above describes an embodiment of the present invention, 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.

This application claims priority to Japanese Patent Application No. 2024-057195, filed March 29, 2024, the entire contents of which are incorporated herein by reference.

REFERENCE SIGNS LIST 1 Raw roll 2 Printed area P Print C Cutting line T Trim area 3 Roll-shaped resin film 4 Scrap material 5 Raw roll 6 Handle 100 Sanitary paper packaging 10 Sanitary paper laminate 10A Sanitary paper (tissue paper)
11 Top surface 12 Bottom surface 13, 14 Long sides 15, 16 Short sides LD Stacking direction 20 Packaging bag 21 Top surface 22 Bottom surface 23 Front surface 24 Back surface 25 Side surface 26 Side surface 30 Dispensing opening 31 Center portion 32, 33 End portions M Perforation OP Opening 200 Packaging bag material 210 Printed portion 220 Remaining portion (trim)
300 Material of the assembly packaging bag 310 Necessary part 320 Remaining part (trim)

Claims (15)

A packaging bag made of resin film for packaging sanitary paper,
The resin film contains a component derived from a waste material of the packaging bag, and the load at 2% elongation in the MD direction of the resin film is 2.0 N or more and 6.5 N or less.
packaging bag. The remaining material is a scrap of a resin film used for the packaging bag.
The packaging bag according to claim 1. The load at 2% elongation in the TD direction of the resin film constituting the packaging bag is 2.5 N or more and 7.0 N or less.
The packaging bag according to claim 1. The tear strength in the MD direction of the resin film constituting the packaging bag is 700 mN or more and 2000 mN or less.
The packaging bag according to claim 1. The tensile modulus of elasticity in the MD direction of the resin film constituting the packaging bag is 150 MPa or more and 450 MPa or less.
The packaging bag according to claim 1. The tensile modulus of elasticity in the TD direction of the resin film constituting the packaging bag is 250 MPa or more and 550 MPa or less.
The packaging bag according to claim 1. The tensile elongation in the MD direction of the resin film constituting the packaging bag is 500% or more and 850% or less.
The packaging bag according to claim 1. The tensile strength in the MD direction of the resin film constituting the packaging bag is 10 N/cm or more and 30 N/cm or less.
The packaging bag according to claim 1. The content of components derived from the waste material in the resin film constituting the packaging bag is 2% by mass or more.
The packaging bag according to claim 1. The content of the printing component in the component derived from the residue is 0.2% by mass or less.
The packaging bag according to claim 1. The packaging bag according to any one of claims 1 to 10;
and sanitary paper contained in the packaging bag.
Sanitary paper packaging. A method for manufacturing the packaging bag according to any one of claims 1 to 10,
A process for producing a raw sheet of the resin film using a leftover material of the packaging bag is included.
Manufacturing method of packaging bags. A resin film collective packaging bag for packaging multiple sanitary papers,
The resin film contains a component derived from the leftover material of the collective packaging bag,
The load at 2% elongation in the MD direction of the resin film is 2.0 N or more and 6.5 N or less.
Collective packaging bag. The waste material is a scrap of resin film used for the collective packaging bag and/or a scrap of resin film used for individual packaging bags made of resin film for packaging the sanitary paper.
The collective packaging bag according to claim 13. A method for manufacturing the collective packaging bag according to claim 13 or 14,
A step of producing the collective packaging bag using leftover materials from the collective packaging bag,
Manufacturing method of collective packaging bags.