Packaging bag, sanitary paper package, method for manufacturing packaging bag, collective packaging bag, and method for manufacturing collective packaging bag

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

[0001] The present invention relates to a packaging bag, a sanitary paper package, a manufacturing method of a packaging bag, a collective packaging bag, and a manufacturing method of a collective packaging bag.

[0002] Patent Document 1 discloses a bag-packed household tissue paper in which household tissue paper is stored in a bag body formed from a flexible film, perforations are formed on the surface of the bag body, and the household tissue paper is pulled out from a slit portion that is opened by tearing the perforations. Patent Document 2 also discloses a film package with perforations for opening, in which perforations for opening are formed in a flexible film base material wrapped around a sanitary paper laminate of sanitary paper.

[0003] Japanese Patent No. 2008-183034 Japanese Patent Application Laid-Open No. 2018-177364

[0004] However, packaging bags for sanitary paper such as tissue paper and paper towels can be difficult to open because the openings on the bags are designed to prevent tearing during transportation or sales. While promoting the use of recycled resources such as biomass and recycled raw materials is required 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.

[0005] An object of the present invention is to provide a packaging bag that has a low environmental impact and is easy to open.

[0006] A packaging bag according to one embodiment 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.

[0007] According to one aspect of the present invention, a packaging bag that has a low environmental impact and is easy to open can be provided.

[0008] 7 is a diagram showing an example of a sanitary paper package using a packaging bag of an embodiment. FIG. 1 is a diagram showing an example of sanitary paper packaged in a packaging bag of an embodiment. FIG. 1 is a view from the top side. FIG. 1 is a diagram showing the sanitary paper package of FIG. 1 in use. FIG. 2 is a diagram showing an example of leftover packaging bag material. FIG. 3 is a flow chart for explaining some steps in a method for manufacturing a sanitary paper package. FIG. 4 is a diagram showing the original roll of resin film that makes up the packaging bag. FIG. 5 is a diagram showing the original roll of resin film that makes up the packaging bag after printing has been applied. FIG. 6 is a diagram showing the printed original roll of resin film that makes up the packaging bag after cutting. FIG. 7 is a diagram showing an example of leftover packaging material of a collective packaging bag. FIG. 8 is a diagram showing the original roll of resin film that makes up the collective packaging bag. FIG. 9 is a flow chart for explaining some steps (packaging multiple sanitary paper sheets) in a method for manufacturing a sanitary paper package including the method for manufacturing a collective packaging bag.

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Common parts in the drawings will be given the same reference numerals and their explanations may be omitted. Also, the scale of each member in each drawing may differ from the actual scale.

[0010] In this specification, the directions in the drawings are explained using a three-dimensional Cartesian coordinate system with three axes (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-rear 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.

[0011] 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 include substantially perpendicular.

[0012] <Packaging bag and sanitary paper package> Fig. 1 is a diagram showing an example of a sanitary paper package using the 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.

[0013] In Fig. 1, the sanitary paper package 100 comprises a sanitary paper laminate 10 and a packaging bag 20. As shown in Fig. 2, the sanitary paper laminate 10 is composed 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.

[0014] The form of the sanitary paper laminate 10 is not particularly limited, and can be, for example, a laminate of sanitary paper 10A in a folded state, a laminate of sanitary paper 10A in a folded state and stacked alternately (a so-called pop-up sanitary paper laminate), or a laminate of multiple sanitary paper 10A simply stacked.

[0015] 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.

[0016] The sanitary paper 10A is not particularly limited in form, and can be applied to, for example, sanitary thin papers such as tissue paper, paper towels, kitchen paper, toilet paper, etc. These sanitary thin papers also include sanitary thin papers containing moisturizing ingredients (for example, lotion tissue, etc.).

[0017] The sanitary paper 10A is not particularly limited in its intended use, and can be used for industrial, home, or portable purposes. Among these, household and portable tissue paper is preferably used as the sanitary paper in this embodiment.

[0018] The number of plies of the sanitary paper 10A is not particularly limited and can be one or more, preferably one or two (two layers). The shape of the sanitary paper 10A is also not particularly limited, but it is preferable that the outline shape of one ply of sanitary paper when folded is quadrangular (rectangular, square, etc.).

[0019] The material of the sanitary paper 10A is not particularly limited, but for example, a base paper made primarily of pulp can be 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.

[0020] The pulp composition of the sanitary paper 10A is not particularly limited. For example, any ratio of softwood pulp, such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp), to hardwood pulp, such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp), can be used.

[0021] In sanitary paper, the ratio of hardwood pulp to softwood pulp 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. In addition, recycled paper pulp may be used as the pulp contained in sanitary paper.

[0022] The basis weight of the sanitary paper 10A is not particularly limited, but in the case of paper, it is 5 g / m ２ 80g / m or more ２ and preferably 10 g / m ２ 60g / m or more ２ or less, more preferably 10 g / m ２ 45g / m or more ２ In the case of nonwoven fabric, the density is 20 g / m or less. ２ More than 100g / m２ The following are preferred: The basis weight is measured in accordance with the provisions of JIS P 8124 (2011).

[0023] The thickness of the sanitary paper is not particularly limited, and can be the thickness measured under the conditions specified in JIS P 8111 (1998). For example, if the sanitary paper 10A is paper, the thickness per two plies is 50 μm to 600 μm, preferably 60 μm to 500 μm, and more preferably 130 μm to 400 μm.

[0024] The sanitary paper 10A may also be embossed. Such embossing can be performed by a known embossing method. The embossing method is not particularly limited, and examples include the steel rubber method and the steel match method.

[0025] The packaging bag 20 is made of a resin film. The components of the resin film that makes up the packaging bag 20 are not particularly limited, and examples of resins that can be used include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), and polyamide (PA). Note that high-density polyethylene, low-density polyethylene, and the like can be used as the polyethylene.

[0026] Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible, easy to handle, have high heat-sealing properties, and are inexpensive. Polyethylene is also preferred because it is odorless, has excellent water resistance and chemical resistance, and can be mass-produced at low cost.

[0027] In addition to the resin, the resin film may contain additives such as stabilizers, fillers, etc. The color of the resin film in the present disclosure (the color in an unprinted state) is white, milky white, or transparent.

[0028] The form of the resin film forming the packaging bag 20 is not particularly limited, and may be a single-layer film formed of a single layer of the above-mentioned resin, a laminate film in which the above-mentioned resin is laminated, a film in which the above-mentioned resin is bonded or laminated with pulp paper or nonwoven fabric, or a mixed film formed from a mixture of two or more of the above-mentioned resins.

[0029] The thickness of the resin film forming the packaging bag 20 is not particularly limited, but is preferably 20 μm to 100 μm, more preferably 25 μm to 70 μm, and even more preferably 30 μm to 50 μm. By making the resin film thickness 20 μm or more, sufficient strength can be ensured for the packaging bag 20 that contains the sanitary paper laminate 10. Furthermore, by making the resin film thickness 100 μm or less, flexibility of the packaging bag 20 can be ensured and it can be made lighter.

[0030] 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 in the packaging bag 20. Such a generally rectangular parallelepiped 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 the bottom surface 22 of the packaging bag 20 face each other in the vertical direction (Z direction), the front surface 23 and the 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, the bottom surface 22, the front surface 23, and the back surface 24.

[0031] 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 short 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 the dimensions when the sanitary paper laminate 10 is contained in the packaging bag 20, as shown in Figures 1 and 2.

[0032] Furthermore, there are no particular limitations on the packaging form of the packaging bag 20. In this embodiment, for example, packaging in which both end portions of a tubular resin film are folded and sealed (caramel packaging), packaging in which both end portions or either end portion 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 closely to the packaged object (shrink packaging), or packaging in which a combination of these may be used.

[0033] In this embodiment, a pair of side surfaces (side surfaces 25, 26 in this embodiment) facing each other in the longitudinal direction (X direction) of the packaging bag 20 are sealed with caramel packaging.

[0034] The sanitary paper laminate 10 contained in the packaging bag 20 has a top surface 11, bottom surface 12, long side surface 13, long side surface 14, short side surface 15, and short side surface 16 that face the top surface 21, bottom surface 22, front surface 23, back surface 24, side surface 25, and side surface 26 of the packaging bag 20, respectively.

[0035] The top surface 21 of the packaging bag 20 is provided with an outlet 30. As shown in Figure 4, the outlet 30 allows the sanitary paper 10A to be pulled out. The outlet 30 is configured as an opening OP. The opening OP that constitutes the outlet 30 may be configured by tearing perforations M (intermittent cuts), as shown in Figures 1 and 3.

[0036] The shape of the opening OP constituting the outlet 30 is not particularly limited, and may be, for example, a straight line, an elongated rectangle, an ellipse, a truck shape, a gourd shape (or a dumbbell shape) or the like in a plan view. Here, the gourd shape (or a dumbbell shape) refers to an ellipse with a narrowed center. Among these, a straight line, an ellipse, a truck shape, and a gourd shape (or a dumbbell shape) are preferred, more preferably a truck shape or a gourd shape (or a dumbbell shape), and even more preferably a gourd shape (or a dumbbell shape).

[0037] As shown in Figures 1, 3, and 4, the outlet 30, which is gourd-shaped (or dumbbell-shaped) 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 shapes of the ends 32, 33 of the outlet 30 are not particularly limited and may be, for example, an oval or a sector.

[0038] When the outlet 30 is gourd-shaped (or dumbbell-shaped) in a planar 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.

[0039] The width (maximum width in the Y direction) of both ends 32, 33 of 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.

[0040] The ratio of the width (width in the Y direction) of the central portion 31 of the outlet 30 to 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% or more and 40% or less, more preferably 7% or more and 30% or less, and even more preferably 10% or more and 25% or less.

[0041] The total length of the outlet 30 in the longitudinal direction (X direction) is not particularly limited, and is, for example, 40% or more and 100% or less 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% or more and 90% or less, and more preferably 50% or more and 80% or less.

[0042] The ratio of the length of the central portion 31 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 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.

[0043] The ratio of the length of each of the end portions 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.

[0044] In the sanitary paper package 100 of the present disclosure, the resin film that constitutes the packaging bag 20 contains components derived from packaging bag residue. In this specification, packaging bag residue (hereinafter sometimes simply referred to as residue) refers to unnecessary or excess material that was generated from the resin film used in the resin film packaging bags that package sanitary paper and that was not used in the packaging bag product.

[0045] The components derived from the waste materials of packaging bags are not particularly limited, and examples thereof include resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), polyamide (PA), etc. Furthermore, examples of polyethylene include high-density polyethylene and low-density polyethylene.

[0046] Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible, easy to handle, have high heat-sealing properties, and are inexpensive. Polyethylene is also preferred because it is odorless, has excellent water resistance and chemical resistance, and can be mass-produced at low cost.

[0047] The packaging bags that are the source of the remnants are packaging bags made of resin film used to package sanitary paper. The remnants of the packaging bags are preferably scraps of the resin film used for the packaging bags. For example, as shown in Figure 5, the scraps of the resin film used for 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.

[0048] The content of components derived from leftover materials in the resin film constituting 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. Note that the upper limit of the content of components derived from leftover materials in the resin film constituting 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.

[0049] In addition, the packaging bags made of resin film used to package sanitary paper are usually printed, and therefore the remaining material from the packaging bags used for such packaging bags contains printed components.

[0050] Therefore, in the packaging bag 20 of the present disclosure, the content of the printed component in the components derived from the packaging bag remnants 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. Note that the lower limit of the content of the printed component in the components derived from the packaging bag remnants is arbitrary, but from the viewpoint of controlling the color of the packaging bag as much as possible, it is preferably 0% by mass.

[0051] 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.

[0052] 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 two benchmark lines of the resin film is elongated by 2% from the original level.

[0053] 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 indicates the direction perpendicular to the MD direction (the flow direction of the resin constituting the resin film).

[0054] 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.

[0055] 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.

[0056] The resin film constituting the packaging bag 20 of the present disclosure preferably has a tensile modulus in the MD direction of 150 MPa to 450 MPa, more preferably 200 MPa to 430 MPa, and even more preferably 230 MPa to 400 MPa. 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.

[0057] 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.

[0058] The resin film constituting the packaging bag 20 of the present disclosure preferably has a tensile elongation in the MD direction of 500% to 850%, more preferably 550% to 800%, and even more preferably 600% to 750%. Here, the tensile elongation of the resin film is a value measured in accordance with JIS K 7127 (1999), and indicates the percentage elongation until the resin film breaks when pulled at a predetermined speed.

[0059] 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.

[0060] 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 to 30 N / cm, more preferably 12 N / cm to 25 N / cm, and even more preferably 15 N / cm to 20 N / cm. 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.

[0061] 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.

[0062] As described above, in the packaging bag 20 of the present disclosure, the resin film that constitutes the packaging bag 20 that packages the sanitary paper 10A contains components derived from leftover materials from the packaging bag, and therefore, packaging bags 20 made of such resin films have a low environmental impact.

[0063] Furthermore, the resin film constituting the packaging bag 20 contains components derived from the leftover material of the 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 packaging bag 20 made of such a resin film has excellent openability. Furthermore, by forming a packaging bag from such a resin film, the amount of lubricant used can be reduced.

[0064] In the packaging bag 20 of the present disclosure, as described above, the remaining material of the packaging bag is scrap material of the packaging bag 20, and therefore the amount of printed components in the remaining material of the packaging bag is small. Therefore, in a packaging bag made of 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 material.

[0065] Therefore, 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 various colors according to the manufacturer's wishes. This promotes the reuse of materials in the field of sanitary paper and promotes efforts to realize a sustainable society.

[0066] In the packaging bag 20 of the present disclosure, as described above, the resin film constituting the packaging bag 20 contains components derived from the remaining material of the packaging bag, and therefore 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, and is easier for the perforation blade to penetrate when forming the perforations for opening, so that the packaging bag 20 made of such a resin film has better openability.

[0067] In the packaging bag 20 of the present disclosure, as described above, the resin film constituting the packaging bag 20 contains components derived from the leftover material of the packaging bag, and thus the tear strength in the MD direction can be 700 mN or more and 2000 mN or less. Such a resin film is even less likely to stretch, and is easier for a perforation blade to penetrate when forming perforations for opening, so that the packaging bag 20 made of such a resin film has even better openability.

[0068] As described above, in the packaging bag 20 of the present disclosure, the resin film constituting the packaging bag 20 contains components derived from the packaging bag remnants, which allows the tensile modulus in the MD 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 of 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 ease of removal of the sanitary paper 10A.

[0069] In the packaging bag 20 of the present disclosure, the resin film constituting the packaging bag 20 contains components derived from the packaging bag remnants, as described above, and thus the tensile modulus in the TD direction can be 250 MPa or more and 500 MPa or less. Because such a resin film easily maintains its shape, packaging bags 20 made of such a resin film have excellent ease of removal of the sanitary paper 10A.

[0070] In the packaging bag 20 of the present disclosure, the resin film constituting the packaging bag 20 contains components derived from the leftover material of the packaging bag, as described above, and thus the tensile elongation in the MD direction can be 500% or more and 850% or less. Such a resin film is even less likely to stretch and is easier for the perforation blade to penetrate when forming the perforations for opening, so that the packaging bag 20 made of such a resin film has even better openability.

[0071] In the packaging bag 20 of the present disclosure, the resin film constituting the packaging bag 20 contains components derived from the packaging bag remnants, as described above, and can therefore have a tensile strength in the MD direction of 10 N / cm or more and 30 N / cm or less. Such a resin film is more likely to retain its shape, and therefore a packaging bag 20 made of such a resin film can improve the ease of removal of the sanitary paper 10A.

[0072] In the packaging bag 20 of the present disclosure, the resin film constituting the packaging bag 20 contains 2% by mass or more of components derived from the leftover material of the packaging bag, which ensures that the resin film constituting the packaging bag 20 is less likely to stretch, thereby enabling a packaging bag 20 with excellent openability to be obtained with high precision.

[0073] In the packaging bag 20 of the present disclosure, as described above, the content of the printing component in the components derived from the packaging bag leftovers is 0.2% by mass or less, so that even if the components derived from the packaging bag leftovers include the printing component, the color of the packaging bag 20 can be made to approximate the color of a packaging bag made from unrecycled or virgin materials. Therefore, in the packaging bag 20 of the present disclosure, even if the resin film constituting the packaging bag 20 uses leftover packaging bag materials, the packaging bag can be printed in various colors as desired by the manufacturer.

[0074] Furthermore, the sanitary paper package 100 of the present disclosure is configured by containing sanitary paper 11A in the above-described packaging bag 20, thereby achieving the same effects as the above-described packaging bag 20. That is, in the sanitary paper package 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 package 100 obtained by packaging the 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.

[0075] Furthermore, in the sanitary paper packaging 100 of the present disclosure, the remaining material of the packaging bag is scraps of the resin film used in the packaging bag, so the color of the packaging bag can be made closer to the color of a packaging bag made from unrecycled or virgin materials.

[0076] <Method of manufacturing packaging bag> Fig. 6 is a flow chart for explaining some steps in a method of 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, and 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 of manufacturing a packaging bag.

[0077] The method for manufacturing the packaging bag of the present disclosure is a method for manufacturing the above-described packaging bag, and includes a step of producing a raw sheet of resin film using leftover material from the packaging bag.

[0078] 6, the method for manufacturing a packaging bag according to 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 according to the present disclosure.

[0079] In the step (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. A plurality of packaging bags, as described below, can be obtained from the raw sheet of resin film 1 in the form of a long roll. As shown in FIG. 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.

[0080] The obtained long roll raw material 1 is further printed with printing P in an area (hereinafter referred to as a printing area) 2 that will later become a packaging bag. Note that printing P is not printed on an area (hereinafter referred to as a trim area) T that will later become a trim.

[0081] In the process (S2) of cutting the raw web, the raw web 1 of the long roll of resin film is cut to a predetermined size. The raw web 1 is cut at predetermined intervals along cutting lines C as shown in FIG. 8 while the long roll of raw web 1 is fed in a predetermined transport direction.

[0082] By cutting this raw web 1, a plurality of rolls of resin film 3 that constitute packaging bags are obtained, as shown in Fig. 9. Furthermore, by cutting both end portions of the raw web 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 of a resin film used for a packaging bag in the manufacturing method of a packaging bag of the present disclosure.

[0083] The step (S4) of producing a raw sheet of resin film using the remnants may include a known resin film manufacturing method. A typical resin film production flow will be described with reference to Fig. 10 . As shown in Fig. 10 , the step (S4, Fig. 6) of producing a resin film using the remnants may include producing remnant pellets from the collected scrap material 4 (S41, Fig. 10 ), melting the resin material containing the produced remnant pellets (S42, Fig. 10 ), and forming it into a film (S43, Fig. 10 ).

[0084] The production of remnant pellets (FIG. 10, S41) can also be performed using known methods. For example, as shown in FIG. 10, remnants of packaging bags (such as scraps) can be sorted, contaminated foreign matter removed, crushed, and washed. The material can then be melted, formed into pellets, cooled, and dehydrated to obtain remnant pellets.

[0085] In the step (S4) of producing a raw sheet of resin film using the remnant material, the obtained remnant material pellets can be used alone, in which case a resin film made from the remnant material is produced. On the other hand, the remnant material pellets can also be used together with, for example, unrecycled resin pellets (virgin resin pellets). In this case, the remnant material pellets can be mixed with the unrecycled resin pellets or unrecycled resin material in any ratio.

[0086] 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 use as much recyclable material as possible. For example, the proportion of components derived from recyclable packaging bags in the recycled resin film may be preferably 20% by mass or more, more preferably 30% by mass or more.

[0087] From the viewpoint 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 (FIG. 10, S42). It is preferable to use materials derived from leftover materials (leftover pellets) in a proportion such that the strength of the resulting film is reduced by 10% or less (i.e., the strength of the resulting film is 90% or more), assuming the strength of a resin film produced from unrecycled resin material to be 100%. From this viewpoint, for example, the proportion of unrecycled resin material (virgin resin material) in the recycled resin film may be preferably 70% by mass or more, more preferably 80% by mass or more.

[0088] In forming the film (FIG. 10, S43), known methods such as inflation, a method using a T-die, and extrusion molding can be used.

[0089] In the method for manufacturing a packaging bag of the present disclosure, the above-mentioned packaging bag is obtained by carrying out a step of producing a raw roll of resin film using leftover packaging bag materials. That is, in the method for manufacturing a packaging bag of the present disclosure, leftover packaging bag materials are used for the resin film that constitutes the packaging bag that packages sanitary paper, and 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.

[0090] Furthermore, in the manufacturing method of the packaging bag disclosed herein, the remaining material of the packaging bag is scrap material of the resin film used for the packaging bag, and by wrapping sanitary paper in resin film made from such scrap material, a packaging bag whose color is close to the color of a packaging bag made from unrecycled or virgin material can be obtained.

[0091] As described above, the manufacturing method of the packaging bag of the present disclosure includes the step of preparing a raw roll (S1), the step of cutting the raw roll (S2), the step of collecting the remaining material (S3), and the step of preparing a raw roll using the remaining material (S4), and these series of steps can be repeated as shown in Figure 6.

[0092] In this repeatable process, the resin film made from the remaining material (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.

[0093] <Collective packaging bag> Figure 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.

[0094] The collective packaging bag of the present disclosure is made of a resin film, and the resin film constituting the collective packaging bag contains components derived from leftover materials from the collective packaging bag. As a result, collective packaging bags made of such a resin film have a low environmental impact.

[0095] Furthermore, the resin film that constitutes the collective packaging bag contains components derived from the leftover material of 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 of such a resin film have excellent openability.

[0096] 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 thereof include resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), polyamide (PA), etc. Furthermore, examples of polyethylene include high-density polyethylene and low-density polyethylene.

[0097] Among these, polyethylene, polypropylene, polyethylene terephthalate, etc. are preferred because they are flexible and easy to handle, have high heat-sealing properties, are inexpensive, etc. Furthermore, polyethylene is preferred because it is odorless, has excellent water resistance and chemical resistance, and can be mass-produced at low cost.

[0098] In addition, from the viewpoint of ensuring the stability of the resin film constituting the collective packaging bag, it is preferable that the component derived from the leftover material of the collective packaging bag be the same type as the component of the resin film constituting the collective packaging bag. For example, if the component of the resin film constituting the collective packaging bag is polyethylene, it is preferable that the component derived from the leftover material of the collective packaging bag is also polyethylene.

[0099] In the collective packaging bag of the present disclosure, the collective packaging bag that is the source of the leftover material is a collective packaging bag that packages multiple sanitary paper packages. Furthermore, the leftover material of the collective packaging bag is preferably a scrap of resin film used in the collective packaging bag and / or a scrap of resin film used in individual packaging bags made of resin film that package the sanitary paper.

[0100] The remnants of the resin film used for the collective packaging bag are, for example, the remaining portion (trim) 320 after removing the portion 310 required for the packaging bag from the collective packaging bag material 300, as shown in Fig. 11. The remnants of the resin film used for the individual packaging bags made of resin film for packaging sanitary paper are, for example, the trim 220 of the packaging bag material 200 shown in Fig. 5 described above.

[0101] In the collective packaging bag of the present disclosure, the remaining material of the packaging bag is thus scraps of the resin film used in the collective packaging bag, and therefore the printed components in the remaining material of the collective packaging bag are small. Therefore, in a collective packaging bag made of resin film containing such scraps, the color of the collective packaging bag can be made closer to the color of a collective packaging bag made from unrecycled or virgin materials.

[0102] Therefore, even if the resin film that makes up the collective packaging bag contains components derived from the leftover materials of the collective packaging bag, the collective packaging bag can be printed in various 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.

[0103] In the collective packaging bag of the present disclosure, as described above, the resin film constituting the collective packaging bag contains components derived from the leftover material of the collective packaging bag, and therefore 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, and is easier for the perforation blade to penetrate when forming the perforations for opening, so collective packaging bags made of such a resin film have even better openability.

[0104] In the collective packaging bag of the present disclosure, as described above, the resin film constituting the collective packaging bag contains a component derived from the leftover material of 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 a perforation blade to penetrate when forming perforations for opening, and therefore collective packaging bags made of such a resin film have even better openability.

[0105] In the collective packaging bag of the present disclosure, as described above, the resin film constituting the collective packaging bag contains components derived from the leftover material of the collective packaging bag, and thus the tensile modulus in the MD direction can be 150 MPa or more and 450 MPa or less. Because such a resin film easily maintains its shape, collective packaging bags made of such a resin film can stably store the sanitary paper packages contained in the collective packaging bag.

[0106] In the collective packaging bag of the present disclosure, the resin film constituting the collective packaging bag contains components derived from the leftover material of the collective packaging bag, as described above, and thus the tensile modulus in the TD direction can be 250 MPa or more and 500 MPa or less. Because such a resin film easily maintains its shape, collective packaging bags made of such a resin film can stably store the sanitary paper packages contained in the collective packaging bag.

[0107] In the collective packaging bag of the present disclosure, the resin film constituting the collective packaging bag contains components derived from the leftover material of the collective packaging bag, as described above, and thus the tensile elongation in the MD direction can be 500% or more and 850% or less. Such a resin film is even less likely to stretch, and is easier for a perforation blade to penetrate when forming perforations for opening, so collective packaging bags made of such a resin film have even better openability.

[0108] In the collective packaging bag of the present disclosure, the resin film constituting the collective packaging bag contains components derived from the leftover material of the collective packaging bag, as described above, and thus the tensile strength in the MD direction can be 10 N / cm or more and 30 N / cm or less. Such a resin film is more likely to retain its shape, so that a collective packaging bag made of such a resin film can stably store the sanitary paper packages contained in the collective packaging bag.

[0109] In the collective packaging bag of the present disclosure, the resin film that makes up the collective packaging bag contains 2% by mass or more of components derived from leftover materials from 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.

[0110] In the collective packaging bag of the present disclosure, as described above, the content of printed components in the components derived from the leftover materials of the collective packaging bag is 0.2% by mass or less, so that even if the components derived from the leftover materials of the collective packaging bag include printed components, the color of the collective packaging bag can be made to approach 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 various colors as desired by the manufacturer.

[0111] <Method for manufacturing aggregate packaging bag> Fig. 12 is a diagram showing an original roll of resin film that constitutes the aggregate packaging bag. The method for manufacturing an aggregate packaging bag of the present disclosure is a method for manufacturing the aggregate packaging bag described above, and includes a step of producing an aggregate packaging bag using leftover material from an aggregate packaging bag.

[0112] Specifically, the aggregate packaging bag can be manufactured in the same manner as the manufacturing method of the packaging bag shown in Figures 6 to 10. Note that in the manufacturing method of the aggregate packaging bag of the present disclosure, the same or corresponding reference numerals are used for the points common to the manufacturing method of the packaging bag described above, and the description thereof will be omitted.

[0113] The method for manufacturing a collective packaging bag according to the present disclosure includes a step (S1) of manufacturing a raw roll of resin film, a step (S2) of cutting the raw roll, a step (S3) of collecting leftover materials from collective packaging bags, and a step (S4) of manufacturing a raw roll of resin film using the leftover materials, as shown in Fig. 6. The steps S1 to S4 shown in Fig. 6 are an example of the steps of manufacturing a collective packaging bag using leftover materials from collective packaging bags in the method for manufacturing a collective packaging bag according to the present disclosure.

[0114] 9, the scrap 4 is an example of a leftover material of the collective packaging bag in the manufacturing method of the collective packaging bag of the present disclosure. The scrap 4 is also an example of a scrap material of the resin film used in the collective packaging bag and / or the individual packaging bag in the manufacturing method of the collective packaging bag of the present disclosure.

[0115] In the step (S1) of preparing a raw sheet of resin film, a raw sheet 5 of resin film in a long roll shape is wound into a roll, as shown in Fig. 12. The raw sheet 5 of resin film in a long roll shape is folded into a gusset shape. Handles 6 are provided at predetermined intervals on the raw sheet 5.

[0116] In the process (S2) of cutting the raw web, the wound raw web 5 is pulled out and cut at predetermined intervals.

[0117] The step (S3) of collecting the remaining materials of the collective packaging bag and the step (S4) of producing a raw sheet of resin film using the remaining materials are the same as those for the packaging bag described above.

[0118] In the method for manufacturing a collective packaging bag of the present disclosure, the above-mentioned collective packaging bag is obtained by carrying out a step of producing a collective packaging bag using leftover materials from collective packaging bags. That is, in the method for manufacturing a collective packaging bag of the present disclosure, 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 therefore, 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.

[0119] Furthermore, in the method for manufacturing collective packaging bags disclosed herein, the leftover materials from the collective packaging bag are 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 the color of collective packaging bags made from unrecycled or virgin materials can be obtained.

[0120] Furthermore, the method for manufacturing an assembly packaging bag according to the present disclosure may be in a form that does not use an original roll of resin film that constitutes the assembly packaging bag, as will be described below. Fig. 13 is a flow diagram of a method for manufacturing a sanitary paper package that includes the method for manufacturing an assembly packaging bag. Fig. 14 is a flow diagram for explaining a part of a process (production of the resin film) of the method for manufacturing a sanitary paper package that includes the method for manufacturing an assembly packaging bag.

[0121] 13, a method for manufacturing a sanitary paper package, including a method for manufacturing a collective packaging bag, 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 bag (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 a collective packaging bag using leftover materials from a collective packaging bag in the method for manufacturing a collective packaging bag of the present disclosure.

[0122] In the step (S10) of producing sanitary paper, a known production method for producing the desired sanitary paper can be used.

[0123] The process of packaging sanitary paper (S20) may include, as shown in FIG. 14, a process of forming a long tubular packaging bag precursor from a packaging material including a resin film (S21), a process of placing sanitary paper in 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).

[0124] More specifically, the process of packaging sanitary paper (S20) involves preparing a long resin film (packaging material) that will later become the packaging bag 20, and forming a resin film precursor (FIG. 14, S21). The resin film precursor is fed in a predetermined transport direction, and can be obtained by joining the ends of the long resin film in the width direction to form a cylindrical shape.

[0125] 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 transport unit (not shown) with a 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, and then unwound from the roll to the transport unit.

[0126] Next, sanitary paper is placed inside the precursor packaging bag (FIG. 14, S22). During this placement, multiple pieces of sanitary paper can be placed (or packed) into the open side of the precursor packaging bag. At this time, air or the like can be blown into the flattened precursor packaging bag to open an opening large enough for the sanitary paper to pass through.

[0127] After the sanitary paper is placed inside the packaging bag precursor, the packaging bag precursor is cut along a direction perpendicular to the predetermined conveying direction at a position where the sanitary paper is not present, and then joined to obtain a sealed packaging bag (FIG. 14, S23). When cutting, the packaging material scraps (also called trims) are cut off. In this specification, the packaging material scraps are an example of packaging material remnants.

[0128] The resin films can be joined together by heat sealing, ultrasonic sealing, adhesives, etc. Of these, heat sealing is preferred because it is a less complicated operation and can form a more reliable bond.

[0129] The joining and cutting of the packaging bag precursor ( FIG. 14 , S23) can be performed by joining and / or cutting units (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 units 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 units may be integrated with each other, or may include a joining unit and a cutting unit 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.

[0130] Before the sanitary paper is placed inside the packaging bag precursor, 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 packaging bag precursor, 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 or the like as described above, the packaging bag precursor can be cut and joined downstream and then upstream after the sanitary paper is placed inside the packaging bag precursor.

[0131] In this way, through the above steps S21 to S23, a plurality of sanitary paper sheets can be wrapped and sealed in a packaging material containing a resin film.

[0132] In the present disclosure, furthermore, leftover materials generated during the process of packaging the sanitary paper in packaging material (S20) 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 products due to missing print, etc.

[0133] One possible way to recycle resin film is to collect packaging bags for sanitary paper that have already been used by users and then create a resin film from them, but the outer surface of the packaging bags is usually printed entirely to prevent the sanitary paper contained therein from being seen from the outside, to prevent the sanitary paper from being affected by light such as ultraviolet rays, etc. Therefore, when packaging bags are collected and the resin film is recycled, the color of the recycled resin film will be heavily dependent on the original packaging bag, and it may be difficult to print the recycled resin film in the desired color.

[0134] 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 a new resin film is produced using leftover materials according to this embodiment, that is, when a resin film containing components derived from leftover materials is produced, a resin film with a color close to the color (white, milky white, transparent, etc.) of a resin film produced from unrecycled materials (virgin materials) can be obtained.

[0135] Therefore, according to this embodiment, recycled resin film can be printed in various colors as desired, which 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 to realize a sustainable society in this field.

[0136] Furthermore, the manufacturing method according to this embodiment uses materials collected in the manufacture of sanitary paper packaging, so the recycled resin film contains fewer foreign substances than when the packaging bags left over after the sanitary paper has been removed from consumers are collected and reused. Alternatively, the refining process for removing foreign substances and other such components can be eliminated or reduced when manufacturing the resin film.

[0137] The collection of packaging bag residues (S30) includes separating and collecting the residues from the product, and may be performed by a dedicated device or by hand. The packaging bag residues collected in step S30 may be residues generated during any step in the step of wrapping sanitary paper with packaging material (S20), but are preferably residues generated during the step of cutting and joining the packaging bag precursors at positions where there is no sanitary paper (S23).

[0138] As described above, the packaging bag waste includes scraps and other scraps generated in the process of cutting and joining the packaging bag precursor (S23), but it is preferable that the packaging bag waste contains at least a large amount of resin film scraps, and it is even more preferable that it is resin film scraps.

[0139] The packaging bag 20 for sanitary paper is usually printed all over. Such printing can be applied in advance, for example, to a resin film that is the packaging material that will later be used to form the packaging bag 20. The printing may also include product information (not shown) about the details of the sanitary paper that is contained therein.

[0140] The printed portions of the packaging bag precursor are such that the portions that will later become the packaging bag 20 (portions that will later constitute the packaging bag 20) are printed areas (not shown) that are printed entirely (have printed parts entirely), but the portions between the portions that will later become the packaging bag 20 are inter-printed areas that are not printed or are not printed entirely (do not have printed parts or do not have printed parts entirely). In other words, the packaging bag precursor has printed areas and inter-printed area areas alternately in the longitudinal direction (conveyance direction).

[0141] In the cutting and joining step (S23), the packaging bag precursor can be cut at a position within the region between the printed regions, specifically at the planned cutting positions. The region between the planned cutting positions is the planned scrap region that will become scrap after the cutting and joining step (S23). As described above, the region between the printed regions is an area with significantly fewer printed areas or no printed areas compared to the printed regions that will later form the packaging bag 20, so the planned scrap region, and therefore the resulting scrap, will also be an area with significantly fewer printed areas or no printed areas compared to the printed regions.

[0142] In the step (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 method for producing a packaging bag shown in Figure 10 described above.

[0143] The process includes a step of packaging the produced sanitary paper in a packaging material containing a resin film (S20), a step of collecting the remaining material (S30), and a step of producing a packaging material containing a resin film using the remaining material (S40). This series of steps can be repeated as shown in FIG. 13. From the second round of this repeatable series of steps, the resin film made from the remaining material (recycled resin film) can be used. This establishes a circular route for recycling resin materials. This promotes material recycling efforts in this field and contributes to achieving the Sustainable Development Goals.

[0144] As described above, the manufacturing method of the collective packaging bag disclosed herein includes a step of producing the collective packaging bag using leftover materials from the collective packaging bag, and therefore the resin film that makes up the packaging bag that packages the sanitary paper contains components derived from the leftover materials from the collective packaging bag. Therefore, 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 can be obtained.

[0145] Furthermore, the manufacturing method of the collective packaging bag disclosed herein includes a step of producing the collective packaging bag using leftover materials from the collective packaging bag, and by packaging multiple pieces of sanitary paper in the collective packaging bag using such leftover materials, a collective packaging bag whose color is close to the color of a packaging bag made from unrecycled or virgin materials can be obtained.

[0146] The present invention will be described in more detail below using examples. The examples and comparative examples were evaluated by the following tests. Note that "%" is based on mass unless otherwise specified.

[0147] [Sanitary Paper Package and Packaging Bag] 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 packs) consisting of multiple sets of two-ply tissue paper stacked in a pop-up style was housed 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 the 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.

[0148] [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 at three points of the packaging bag six times each, and the average value was calculated as the paper thickness.

[0149] [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 taken as the tensile strength in each direction.

[0150] [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.

[0151] [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.

[0152] [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.

[0153] [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.

[0154] [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 represents the degree of cloudiness of a substance (or the degree of light diffusion), 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.

[0155] [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 %, as the ratio of the intensity of incident light to 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.

[0156] [Openability] The openability of the packaging bag was confirmed. 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.

[0157] [Pop-up performance] 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 the sanitary paper package. Evaluation was based on the following criteria. If the sagging occurred within 0 to 5 times, it was rated as good, and if it occurred 6 to 10 times, it was rated as poor.

[0158] [Pulling property] 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 pulling strength of the second to fifth sets was measured for five samples. The unit of pulling strength is N. The tissue was pulled perpendicular to the top surface of the packaging bag, and the pulling speed was 230 mm / sec. The pulling strength was the maximum value until the tissue was released from the packaging bag. The pulling property was rated as excellent when the pulling 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.

[0159] [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 the number of subjects who noticed the presence of foreign matter was 0, as good when the number of subjects who noticed the presence of foreign matter was 1 to 5, and as poor when the number of subjects who noticed the presence of foreign matter was 6 or more.

[0160] [Environmental compatibility of packaging bags] The environmental compatibility of the packaging bags was evaluated. The environmental compatibility was evaluated as excellent when the content of packaging bag residue 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%.

[0161] Examples and comparative examples will be described below.

[0162] [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.

[0163] [Example 2] The proportion of resin film scraps used in the packaging bag not containing 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.

[0164] [Example 3] The proportion of resin film scraps used in the packaging bag not containing 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.

[0165] [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 scrap printing proportion) was 0.9%, the proportion of printed components in the entire resin film constituting the packaging bag (hereinafter referred to as 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.

[0166] [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.

[0167] [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.

[0168] [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.

[0169] [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.

[0170] [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. Other than that, a sanitary paper package was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0171] [Comparative Example 2] The resin film constituting the packaging bag did not contain any scraps of the resin film used in the packaging bag (the proportion of scraps 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. Other than that, a sanitary paper package was produced and evaluated in the same manner as in Example 7. The results are shown in Table 1.

[0172]

[0173] As can be seen from Table 1, in Examples 1 to 8, the sanitary paper packages using packaging bags in which the resin film constituting the packaging bag contained components derived from the packaging bag waste and the load at 2% elongation in the MD direction was 2.5 N to 6.5 N were good in environmental compatibility. Furthermore, compared with the sanitary paper packages of Comparative Examples 1 and 2 (conventional sanitary paper packages), the haze, gloss, and openability were good.

[0174] Furthermore, in Examples 1 to 7, the sanitary paper packaging using packaging bags in which the content of printing components in the components derived from the waste material was 0.2 mass% or less had an even better appearance and better pop-up and pull-out properties.

[0175] Furthermore, in Examples 2 and 3, the sanitary paper packaging bodies in which the content of components derived from waste materials in the resin film constituting the packaging bag was 20% by mass or more were excellent in environmental friendliness.

[0176] The above-disclosed embodiments include, for example, the following aspects.

[0177] 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 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.

[0178] In this specification, the MD direction of a resin film refers to the flow direction of the resin constituting the resin film. 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 of the resin film is elongated by 2% from the original level.

[0179] In the first aspect, the resin film that constitutes the packaging bag for packaging sanitary paper contains components derived from the packaging bag, so that packaging bags made of such a resin film have a low environmental impact.

[0180] In the first aspect, the resin film constituting the packaging bag contains a component derived from the leftover material of the 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 packaging bags made of such a resin film have excellent openability. Furthermore, by forming a packaging bag with such a resin film, the amount of lubricant used can be reduced.

[0181] In a second aspect of the present embodiment, the packaging bag according to the first aspect is provided, in which the remnant material is a remnant of the resin film used for the packaging bag. While resin film packaging bags for packaging sanitary paper are typically printed, the remnant of the resin film used for the packaging bag is the cut position of the resin film used for the packaging bag and its surrounding area, and therefore is not printed, or at least not entirely printed like the portion that will become the packaging bag.

[0182] In the second aspect, since the remaining material of the packaging bag is a scrap of resin film used in such packaging bags, there is little printed component in the remaining material of the packaging bag, and therefore, in a packaging bag made of resin film containing such remaining material, the color of the packaging bag can be made closer to the color of a packaging bag made from unrecycled or virgin material.

[0183] Therefore, in the second aspect, even if the resin film constituting the packaging bag contains components derived from packaging bag waste, the packaging bag can be printed in various colors as desired by the manufacturer, which promotes the reuse of materials in the field of sanitary paper and promotes efforts to realize a sustainable society.

[0184] A third aspect of the present embodiment is the packaging bag according to the first or second aspect, wherein 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).

[0185] In the third aspect, as described above, the resin film constituting the packaging bag contains a component derived from the remaining material of the packaging bag, and thus 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, and the perforation blade can penetrate more easily when forming the perforations for opening, so that packaging bags made of such a resin film have even better openability.

[0186] A fourth aspect of the present embodiment is the packaging bag according to any one of the first to third aspects, wherein 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.

[0187] In the fourth aspect, as described above, the resin film constituting the packaging bag contains a component derived from the remaining material of the packaging bag, and thus the tear strength in the MD direction can be 700 mN or more and 2000 mN or less. Such a resin film is even less likely to stretch, and is easier for a perforation blade to penetrate when forming perforations for opening, so that packaging bags made of such a resin film have even better openability.

[0188] In a fifth aspect of the present embodiment, the packaging bag according to any one of the first to fourth aspects is characterized in that the resin film constituting the packaging bag has a tensile modulus in the machine direction of 150 MPa to 450 MPa. In this specification, 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.

[0189] In the fifth aspect, as described above, the resin film constituting the packaging bag contains components derived from the remaining material of the packaging bag, and thus the tensile modulus in the MD direction can be 150 MPa or more and 450 MPa or less. Because such a resin film is easy to maintain its shape, packaging bags made of 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.

[0190] A sixth aspect of this embodiment is a packaging bag described in any one of the first to fifth aspects, in which the tensile modulus in the TD direction of the resin film constituting the packaging bag is 250 MPa or more and 550 MPa or less.

[0191] In the sixth aspect, the resin film constituting the packaging bag contains a component derived from the remaining material of the packaging bag, as described above, and thus the tensile modulus in the TD direction can be 250 MPa or more and 500 MPa or less. Such a resin film is easy to maintain its shape, and therefore a packaging bag made of such a resin film has excellent ease of removal of sanitary paper.

[0192] A seventh aspect of the present embodiment is the packaging bag according to any one of the first to sixth aspects, wherein 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 elongation until the resin film breaks when pulled at a predetermined speed.

[0193] In the seventh aspect, the resin film constituting the packaging bag contains a component derived from the remaining material of the packaging bag, as described above, and thus the tensile elongation in the MD direction can be 500% or more and 850% or less. Such a resin film is even less likely to stretch, and is easier for a perforation blade to penetrate when forming perforations for opening, so that packaging bags made of such a resin film have even better openability.

[0194] An eighth aspect of the present embodiment is the packaging bag according to any one of the first to seventh aspects, wherein the resin film constituting the packaging bag has a tensile strength in the MD direction of 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.

[0195] In the eighth aspect, the resin film constituting the packaging bag contains a component derived from the packaging bag waste material, as described above, and thus the tensile strength in the MD direction can be 10 N / cm or more and 30 N / cm or less. Such a resin film is more likely to maintain its shape, and therefore a packaging bag made of such a resin film can improve the ease of removal of sanitary paper.

[0196] A ninth aspect according to the present embodiment is the packaging bag according to any one of the first to eighth aspects, wherein the content of the component derived from the waste material in the resin film constituting the packaging bag is 2% by mass or more. In the ninth aspect, since the resin film constituting the packaging bag contains 2% by mass or more of the component derived from the waste material of the packaging bag, the resin film constituting the packaging bag is reliably made less likely to stretch, and therefore a packaging bag with excellent openability can be obtained with high precision.

[0197] A tenth aspect of the present embodiment is the packaging bag according to any one of the first to ninth aspects, wherein the content of the printed component in the components derived from the waste material is 0.2 mass % or less. In this specification, the printed component refers to the component that was used to print the resin film contained in the waste material of the packaging bag.

[0198] In the tenth aspect, since the content of the printing component in the components derived from the packaging bag waste is 0.2 mass% or less, even if the components derived from the packaging bag waste include the printing component, the color of the packaging bag can be made to approach the color of a packaging bag made from unrecycled or virgin materials. Therefore, in the tenth aspect, even if the resin film constituting the packaging bag is made from a packaging bag waste material, it is possible to print the packaging bag in various colors as desired by the manufacturer.

[0199] An eleventh aspect of this embodiment is a sanitary paper package having the packaging bag according to 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.

[0200] That is, in the eleventh aspect, the resin film that constitutes the packaging bag in which the sanitary paper is packaged contains components derived from the leftover materials of the packaging bag, and the sanitary paper package obtained by packaging the sanitary paper in such a resin film has a low environmental impact, is easy to open, and the sanitary paper can be easily removed.

[0201] In addition, in the 11th 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 to be closer to the color of a packaging bag made from unrecycled or virgin material.

[0202] 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.

[0203] In the twelfth aspect, the packaging bag described above is obtained by carrying out a step of producing a raw roll of resin film using leftover packaging bag material. That is, in the twelfth aspect, leftover packaging bag material is used for the resin film that constitutes the packaging bag for packaging sanitary paper, and 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.

[0204] In addition, in the 12th aspect, the remaining material of the packaging bag is leftover material from the resin film used for the packaging bag, and when sanitary paper is wrapped in resin film made from such leftover material, the color of the packaging bag is close to the color of packaging bags made from unrecycled or virgin materials.

[0205] A thirteenth aspect of the present invention is a collective packaging bag made of a resin film for packaging a plurality of sanitary paper sheets, 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.

[0206] In a thirteenth aspect, the resin film constituting the collective packaging bag contains components derived from leftover materials of the collective packaging bag, so that the collective packaging bag made of such a resin film has a low environmental impact.

[0207] In a thirteenth aspect, the resin film constituting the collective packaging bag contains a component derived from the leftover material of 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 of such a resin film have excellent openability. Furthermore, by forming collective packaging bags with such a resin film, the amount of lubricant used can be reduced.

[0208] 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 for the collective packaging bag and / or scraps of resin film used for the individual packaging bags made of resin film for packaging the sanitary paper. Collective packaging bags made of resin film for packaging a plurality of sanitary paper sheets and individual packaging bags made of resin film for packaging sanitary paper sheets are usually printed, but the scraps of resin film used for the collective packaging bag and the individual packaging bags are the cutting positions and surrounding areas of the resin film used for the collective packaging bag and the individual packaging bags, and therefore are not printed, or at least not entirely printed like the parts that become the collective packaging bag or the individual packaging bags.

[0209] In the fourteenth aspect, the leftover material of 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 therefore the collective packaging bag made of resin film using such leftover material can have a color that is closer to the color of a collective packaging bag made from unrecycled or virgin material.

[0210] A fifteenth aspect of the present invention is a method for manufacturing an aggregate packaging bag according to the thirteenth or fourteenth aspect, which includes a step of producing the aggregate packaging bag using leftover material from the aggregate packaging bag.

[0211] In a fifteenth aspect, the above-mentioned collective packaging bag is obtained by carrying out a step of producing a collective packaging bag using leftover materials from collective packaging bags. That is, in a sixteenth aspect, the resin film constituting the collective packaging bag for packaging a plurality of sanitary paper sheets contains components derived from the leftover materials from collective packaging bags, and by packaging a plurality of sanitary paper sheets with such a resin film, a collective packaging bag with low environmental impact and excellent openability is obtained.

[0212] In addition, in the 15th aspect, the leftover material of the collective packaging bag is leftover resin film used for the collective packaging bag and / or leftover resin film used for the individual packaging bags, and by wrapping multiple sanitary papers in resin film made from such leftover material, a collective packaging bag whose color is close to the color of collective packaging bags made from unrecycled or virgin materials is obtained.

[0213] Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims.

[0214] This application claims priority based on Japanese Patent Application No. 2024-057195, filed on March 29, 2024, the entire contents of which are incorporated herein by reference.

[0215] 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 portion M Perforation OP Opening 200 Packaging bag material 210 Printed portion 220 Remaining portion (trim) 300 Collective packaging bag material 310 Required portion 320 Remaining portion (trim)

Claims

1. 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 machine direction is 2.0 N or more and 6.5 N or less.

2. The packaging bag according to claim 1, wherein the remaining material is a scrap of a resin film used in the packaging bag.

3. The packaging bag according to claim 1, wherein 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.

4. The packaging bag according to claim 1, wherein the tear strength in the machine direction of the resin film constituting the packaging bag is 700 mN or more and 2000 mN or less.

5. The packaging bag according to claim 1, wherein the resin film constituting the packaging bag has a tensile modulus in the machine direction of 150 MPa or more and 450 MPa or less.

6. The packaging bag according to claim 1, wherein 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.

7. The packaging bag according to claim 1, wherein the resin film constituting the packaging bag has a tensile elongation in the machine direction of 500% or more and 850% or less.

8. The packaging bag according to claim 1, wherein the resin film constituting the packaging bag has a tensile strength in the machine direction of 10 N / cm or more and 30 N / cm or less.

9. The packaging bag according to claim 1, wherein the content of components derived from the waste material in the resin film constituting the packaging bag is 2% by mass or more.

10. The packaging bag according to claim 1, wherein the content of printing components in the components derived from the waste material is 0.2% by mass or less.

11. A sanitary paper package comprising the packaging bag according to any one of claims 1 to 10 and sanitary paper contained in the packaging bag.

12. A method for manufacturing a packaging bag according to any one of claims 1 to 10, comprising a step of producing a raw sheet of the resin film using a leftover material from the packaging bag.

13. 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 of the resin film at 2% elongation in the MD direction is 2.0 N or more and 6.5 N or less.

14. The collective packaging bag according to claim 13, wherein the leftover material is a scrap of resin film used in the collective packaging bag and / or a scrap of resin film used in the individual packaging bags made of resin film for packaging the sanitary paper.

15. A method for manufacturing a collective packaging bag according to claim 13 or 14, comprising a step of producing the collective packaging bag using leftover material from the collective packaging bag.

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