Roll products

Abstract

To provide an environment-friendly gusset package which is used for storing a roll, and can suppress occurrence of opening failure, printing failure and unsealing failure, and pseudo adhesion between a roll and a resin film.SOLUTION: In a roll product 1 obtained by forming a roll 10 by winding a long paper sheet into a roll shape and packaging it in a gusset bag, the gusset bag has a storage part 20 for storing the roll 10, an intermediate part 30 rising from an upper end of the storage part 20, a gusset part 35 located on each side in the width direction of the storage part 20 and the intermediate part 30, a grip part 40 rising from a top portion 32 of the intermediate part 30, and a printed part disposed on a surface of the storage part 20 and / or the intermediate part 30. The gusset bag comprises a resin film. The resin film contains a biomass-derived raw material in an amount of 1 mass% or more to 75 mass% or less with respect to the total raw materials. The resin film has a Young's modulus of 150 MPa or more to 600 MPa or less in the TD direction, a printing area ratio of 20% or more to 95% or less in a gusset part 35, and a gusset ratio of 20% or more to 95% or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to roll products. [Background technology]

[0002] Many roll products, such as toilet paper rolls and kitchen towel rolls, are commercially available in which long sheets of paper are wound into rolls and packaged within gusseted packaging. Gusseted packaging is a type of packaging in which a roll is placed inside a columnar packaging bag made of resin film, with the top portion left uncovered. At the uncovered portion of the packaging bag, one opposing resin film is folded inward, while the upper ends of the other opposing resin film are welded together. In line with current environmental trends, attempts are being made to use environmentally friendly biomass film as the resin film that makes up the packaging bag in gusseted packaging.

[0003] Biomass film is a resin material obtained by replacing part or all of a petroleum-derived resin, which is polymerized from petroleum-based monomers synthesized from fossil fuels such as petroleum, with a biomass-derived resin, which is polymerized from plant-based monomers synthesized from plants such as corn and sugarcane, or from a resin material obtained by polymerizing petroleum-based monomers and plant-based monomers. Various proposals have been made regarding biomass resins.

[0004] Patent Document 1 discloses a method for producing an ethylene-butylene copolymer (Claim 1), in which 1-butylene is synthesized from plant raw materials via ethanol, ethylene, acetaldehyde, 1-butanol, 3-hydroxy-butanal, crotonaldehyde, 1-butanol, and a mixture of butylene isomers (1-butylene and 2-butylene), and ethylene and 1-butylene are polymerized to obtain a renewable, naturally derived ethylene-butylene copolymer containing 100% carbon. According to Patent Document 1, an ethylene-butylene copolymer synthesized from naturally derived carbon-containing materials is provided.

[0005] Patent Document 2 describes a resin composition comprising a biomass-derived polyolefin obtained by polymerizing monomers containing biomass-derived ethylene and α-olefin, and a fossil fuel-derived polyolefin obtained by polymerizing fossil fuel-derived ethylene and / or α-olefin monomers, wherein the biomass-derived or fossil fuel-derived α-olefin is butylene, hexene, or octene, and the content of biomass-derived ethylene in the resin composition is 5% by mass or more of the total resin composition, and the density of the resin composition is 0.91 g / cm³ 3 More than 0.96g / cm 3 The following resin film is disclosed. According to Patent Document 2, a resin film is provided which consists of a resin composition containing a carbon-neutral polyolefin using biomass-derived ethylene (paragraph 0022). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 5551605 [Patent Document 2] Patent No. 6020975 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, when biomass films containing biomass resin, as described in Patent Documents 1 and 2, are used in gusset packaging bags for toilet rolls and kitchen towel rolls, opening defects may occur. For example, this is a defect called blocking, where the inner surfaces of the gusset bags become pseudo-adhered to each other. Also, because the film's adhesiveness increases, there is a risk of pseudo-adhesion to the contents. This is especially likely to occur when the contents are long toilet rolls or kitchen towel rolls, as the film and roll adhere tightly to each other. These problems can be solved, for example, by laminating a regular film onto the biomass film, but this increases the film cost and is not practical. Another method is to increase the amount of anti-blocking agent, such as silica, added to the film, but this can lead to problems such as printing defects like ink bleeding or insufficient heat seal strength.

[0008] The objective of the present invention is to provide an environmentally friendly gusseted packaging that houses a roll in gusseted packaging, thereby suppressing the occurrence of opening defects, printing defects, and opening defects, as well as pseudo-adhesion with the contents. [Means for solving the problem]

[0009] The inventors of the present invention have conducted extensive research to solve the above problems and have found that by setting the proportion of biomass-derived raw materials in the total raw materials of the resin film constituting the gusseted packaging bag, the Young's modulus in the TD direction of the resin film, the printing area ratio in the gusset portion, and the gusset ratio to predetermined ranges, a desired roll product as a gusseted packaging body can be obtained, thus completing the present invention. The present invention provides the following roll product.

[0010] (1) A roll product in which a long paper sheet is wound into a roll and packaged in a gusseted bag, The gusset bag has a storage section for storing the roll, an intermediate section rising upward from the upper end of the storage section, gusset sections located on both sides in the width direction of the storage section and the intermediate section, a handle section rising upward from the top of the intermediate section, and a printing section provided on the surface of the storage section and / or the intermediate section. The gusseted bag is made up of a resin film, The aforementioned resin film contains biomass-derived raw materials in an amount of 1% to 75% by mass of the total raw materials. The Young's modulus of the resin film in the TD direction is 150 MPa or more and 600 MPa or less. A roll product in which the printing area ratio in the gusset portion is 20% or more and 95% or less, and the gusset ratio is 30% or more and 95% or less. (2) The roll product of (1) above, wherein the coefficient of dynamic friction of the unprinted inner surface of the gusset bag is 0.01 or more and 0.5 or less. (3) The roll product of (1) or (2) above, wherein the ratio of the area of ​​the printed portion to the total surface area of ​​the gusset bag excluding the handle portion is 20% or more. (4) A roll product of any of the above (1) to (3), wherein the resin film contains polyethylene. (5) Any roll product of (1) to (4) above, wherein the thickness of the resin film is 20 μm or more and 60 μm or less. (6) Any of the roll products described in (1) to (5) above, wherein the Young's modulus of the resin film in the MD direction is 100 MPa or more and 400 MPa or less. (7) Any of the roll products described in (1) to (6) above, wherein the coefficient of dynamic friction of the non-printed portion on the surface of the gusset bag where the printed portion is not formed is 0.01 or more and 0.50 or less. (8) Any of the roll products described in (1) to (7) above, wherein the roll is a toilet roll or a kitchen towel roll. [Effects of the Invention]

[0011] According to the present invention, an environmentally friendly gusseted packaging is provided that houses a roll and suppresses the occurrence of opening defects, printing defects, and opening defects, as well as pseudo-adhesion with the contents.

Brief Description of the Drawings

[0012] [Figure 1] It is a perspective view schematically showing the external configuration of a roll product according to an embodiment of the present invention. [Figure 2] It is a schematic perspective view showing the external configuration of the roll packaged inside the roll product shown in FIG. 1. [Figure 3] It is a schematic diagram explaining the mechanism of blocking in cassette packaging. (a) and (b) are schematic perspective views showing the cassette packaging process, and (c) and (d) are schematic cross-sectional views in the horizontal direction of the gusset part. [Figure 4] It is a schematic cross-sectional view in the horizontal direction explaining how to obtain the gusset ratio in the gusset part. [Figure 5] It is a schematic cross-sectional view in the horizontal direction explaining the problems caused according to the gusset ratio. (a) shows when the gusset ratio is within the specified range, (b) shows when the gusset ratio is less than 20%, and (c) shows when the gusset ratio exceeds 95%.

Modes for Carrying Out the Invention

[0013] <Roll Product> FIG. 1 shows a roll product 1 as a gusset package according to this embodiment. FIG. 2 shows a roll 10 packaged inside the roll product 1. Specific examples of the roll 10 include, for example, toilet roll, kitchen towel roll, etc. FIGS. 4 and 5 explain the gusset ratio.

[0014] As shown in FIG. 1, the roll product 1 of this embodiment is a product in which 4 rolls 10 formed by winding a long paper sheet in a roll shape are packaged in a gusset packaging bag made of an environmentally friendly resin film. The number of rolls 10 packaged in the gusset packaging bag is not particularly limited and may be 1 or a plurality, but numbers such as 2, 4, 6, 8, 12, 18, etc. are preferable. In this embodiment, the roll 10 is packaged in the gusset packaging bag so that the axial direction of the roll 10 coincides with the MD direction of the resin film constituting the gusset packaging bag.

[0015] The gusseted packaging bag of this embodiment is made of an environmentally friendly resin film containing biomass-derived raw materials in an amount of 1% to 75% by mass of the total raw materials, and having a Young's modulus in the TD direction of 150 MPa to 600 MPa. Furthermore, the gusseted packaging bag of this embodiment has a gusset portion 35, with a printing area ratio of 20% to 95% and a gusset ratio of 20% to 95% in the gusset portion 35. According to the roll product 1 of this embodiment, in which a roll 10 is gusseted using a packaging bag made of such a resin film with a printing area ratio and gusset ratio in the gusset portion 35 within the aforementioned ranges, the defect rate during packaging can be suppressed in the manufacturing process, and pseudo-adhesion between the contents and the film can be suppressed.

[0016] The inventors have considered the mechanism by which blocking occurs when biomass film is used as the resin film in gusset packaging as follows. The inventors' considerations will be explained with reference to Figure 3. Figure 3 is a schematic diagram illustrating the mechanism by which blocking occurs in gusset packaging. In general gusset packaging, from the viewpoint of transportation efficiency, the gusset bag 50 is folded vertically to form a sheet, and this is wound into a roll for supply. In the process shown in Figure 3(a), a suction pad 51 is placed at a predetermined position on the folded gusset bag 50 and vacuum suction is applied vertically. In the process shown in Figure 3(b), the gusset bag 50 opens due to vacuum suction and rises vertically, so that the gusset bag 50 encloses the roll 10. Although not shown, the bottom surface is welded in a later process to obtain the gusset packaging. Figure 3(b) shows the state in which the gusset bag 50 is rising vertically before it encloses the roll 10.

[0017] As shown in Figure 3(c), the gusset portion 52 has a double-layered gusset made by folding the resin film inward. When folded, the resin film (biomass film) adheres more tightly to the gusset portion 52 than to other parts of the gusset packaging bag 50. Furthermore, because the biomass film is adhesive, the two overlapping biomass films of the gusset portion 52 tend to pseudo-adhere in the gusset bag 50 before it is folded and vacuum-suctioned. In this pseudo-adhesion state, the vacuum-suction opening in the packaging machine does not function correctly, resulting in a higher defect rate. In addition, gusset packaging that is packaged with the biomass film of the gusset portion 52 pseudo-adheded will have a poor appearance, and when attempting to open the gusset packaging and remove the roll 10, the roll 10 may pseudo-adhere to the resin film, making it more likely for problems such as the paper sheet wound on the roll 10 to tear. In other words, according to the inventors' research, the reason why gusseted packaging is prone to opening defects, packaging defects, and unpacking defects is thought to be due to a complex interplay of the special structure of the gusseted packaging bag 50 (the part where the resin film of the gusset portion 52 is folded and overlapped), the sheet-like form of the gusseted packaging bag 50 when it is delivered, and the biomass film. In this embodiment, the problem has been successfully solved by using a biomass film having predetermined characteristics and by setting the printing area ratio and gusset ratio in the gusset portion within predetermined ranges.

[0018] The following describes the structure of the gusset bag, the properties of the resin film that makes up the gusset bag, and the characteristics of the gusset portion.

[0019] <Structure of a gusseted bag> As shown in Figure 1, the gusseted bag of this embodiment has a storage section 20, an intermediate section 30, a gusseted section 35, a handle section 40, and a printed section (not shown). The storage section 20 is cylindrical in shape for storing the roll 10, and its bottom is welded. The intermediate section 30 connects the upper end of the storage section 20 and the lower end of the handle section 30, and has two slanted sections 31 and a top section 32. The two slanted sections 32 are regions with an inverted V shape in cross-section, formed by folding one opposing resin film inward at the top of the storage section 20 and raising it diagonally upward so that the other opposing resin film at the top of the storage section 20 is continuously close to it, and have gusseted sections 35b on both sides in the width direction, which are overlapping resin film sections. The top section 32 is the region where the upper ends of the two slanted sections 31 are joined. The handle portion 40 rises upward from the top 32 of the intermediate portion 30 and extends horizontally in a band shape. The handle portion 40 is provided with a perforation 42 that extends in the width direction approximately in the center of the longitudinal direction to assist in opening the roll product 1, and two finger insertion holes 41 that are opposite each other in the longitudinal direction via the perforation 42 and extend in the longitudinal direction. The gusset portion 35 is connected to the storage portion 20, the intermediate portion 30 and the handle portion 40. In the storage portion 20, it is the sides 35a in the direction in which the resin film in the intermediate portion 30 is folded inward, in the intermediate portion 30 it is the area 35b where the resin film is folded inward and becomes doubled, and in the handle portion 40 it is the area 35c where the resin film is doubled on both sides in the width direction. The printed portion is provided on the inner surface of the gusset bag and consists of single-color or multi-color characters, patterns, combinations thereof, markings, etc.

[0020] <Resin film> Resin films can be obtained, for example, by forming a film from a thermoplastic resin obtained by polymerizing polymerizable monomers. Raw materials for polymerizable monomers include petroleum-based raw materials and plant-based raw materials such as corn and sugarcane. In this invention, polymerizable monomers synthesized from petroleum-based raw materials are called non-biomass raw materials, and polymerizable monomers synthesized from plant-based raw materials are called biomass raw materials. An example of the resin film in this embodiment is a blend of a biomass-based resin material obtained by polymerizing biomass raw materials (polymerizable monomers) and a petroleum-based resin material obtained by polymerizing non-biomass raw materials (polymerizable monomers).

[0021] Examples of the thermoplastic resins mentioned above include polyethylene, polypropylene, polyester, polyethylene terephthalate, polyamide, polyvinylidene chloride, and ethylene vinyl alcohol copolymer. Among these, polyethylene, polypropylene, polyvinylidene chloride, and ethylene vinyl alcohol copolymer are preferred, polyethylene and polypropylene are more preferred, and polyethylene is even more preferred from the viewpoint of ease of adjusting the parameters described later. The material of the resin film preferably contains polyethylene, more preferably contains polyethylene in an amount of 50% by mass or more of the total, and even more preferably consists only of polyethylene.

[0022] (Percentage of biomass-derived raw materials) The resin film of this embodiment includes, for example, a biomass-based resin material and a petroleum-based resin material. The biomass-derived raw material content in the resin film is in the range of 1% by mass to 75% by mass of the total resin material (total raw materials) including the biomass-based resin material and the petroleum-based resin material, preferably in the range of 3% by mass to 50% by mass, and more preferably in the range of 5% by mass to 25% by mass. If the biomass-derived raw material content is less than 1% by mass, it cannot be said to be an environmentally friendly resin film. If the biomass-derived raw material content exceeds 75% by mass, the tackiness of the resin film surface increases, and blocking in the intermediate portion 30 tends to occur more easily. The biomass-derived raw material content is measured by the ASTM D6866 method.

[0023] (Young's modulus in the TD direction) The Young's modulus of the resin film in the TD direction is in the range of 150 MPa to 600 MPa, preferably in the range of 200 MPa to 500 MPa, and more preferably in the range of 250 MPa to 400 MPa. If the Young's modulus in the TD direction is less than 150 MPa, when gusset packaging is performed, the resin film is too soft, making it easy for gaps to form between the suction pad 51 and the resin film, and since vacuum suction is not possible, opening defects tend to occur. If the Young's modulus in the TD direction exceeds 600 MPa, the gusset packaging bag does not expand easily and does not adequately follow the shape of the roll 10 containing the contents, which tends to result in packaging defects.

[0024] (Young's modulus in the MD direction) In preferred embodiments, the Young's modulus of the resin film in the MD direction is, for example, in the range of 100 MPa to 400 MPa, 120 MPa to 350 MPa, or 180 MPa to 300 MPa. When the Young's modulus in the MD direction is less than 100 MPa, the resin film is too soft when gusset packaging, making it easy for gaps to form between the suction pad 51 and the resin film, preventing vacuum suction and thus increasing the likelihood of opening defects. When the Young's modulus in the MD direction exceeds 400 MPa, the gusset packaging bag does not expand easily and does not adequately conform to the shape of the roll 10 containing the contents, leading to a tendency for packaging defects. The Young's modulus of the resin film in the TD direction and MD direction can be measured in accordance with JIS K 7161-1:2014.

[0025] (Coefficient of kinetic friction on the inner surface of the gusset bag) In other preferred embodiments, the coefficient of dynamic friction of the unprinted area (non-printed portion) on the inner surface of the resin film is, for example, in the range of 0.01 to 0.5, 0.05 to 0.4, or 0.1 to 0.3. Here, the inner surface of the resin film is the inner surface facing the roll 10 in the gusset bag. If the coefficient of dynamic friction is less than 0.01, heat transfer will be insufficient when heat sealing, and sealing defects are likely to occur. If the coefficient of dynamic friction exceeds 0.5, the inner surfaces of the resin film (unprinted smooth surfaces) will adhere closely to each other, resulting in pseudo-adhesion, and blocking is likely to occur. The coefficient of dynamic friction of the resin film can be measured in accordance with JIS K 7125 1999.

[0026] (Area ratio of the printed area on the inside) In another preferred embodiment, a printed area (not shown) is provided on the outward-facing surface of the storage section 20 and / or the intermediate section 30. The ratio of the area of ​​the printed area to the total surface area of ​​the gusset bag excluding the handle section 40, i.e., the total surface area of ​​the inward-facing surfaces of the storage section 20 and the intermediate section 30 (hereinafter also simply referred to as the "inner surface area ratio") is in the range of 20% or more, 30% or more, or 40% or more. If the inner surface area ratio is less than 20%, no printed area is formed on the resin film constituting the gusset bag, and the inner surface where there is no ink is adhesive. As a result, the roll 10 and the inner surface of the resin film constituting the gusset bag tend to adhere to each other, and the sheet tends to tear when the roll 10 is removed from the gusset bag.

[0027] (Thickness) In yet another preferred embodiment, the thickness of the resin film is, for example, in the range of 20 μm to 60 μm, 23 μm to 50 μm, or 25 μm to 40 μm. If the thickness is less than 20 μm, the rigidity of the resin film, including its Young's modulus, decreases, making the resin film too soft and prone to gaps between the suction pad 51 and the resin film. When gusset packaging is performed, the adhesiveness of the resin film overwhelms the vacuum suction, resulting in insufficient opening of the gusset packaging bag and a tendency for packaging defects to occur. If the thickness exceeds 60 μm, heat transfer during heat sealing becomes insufficient, and a tendency for sealing defects to occur. The thickness of the resin film can be measured in accordance with JIS K 7130:1999.

[0028] (Coefficient of dynamic friction of the non-printed outer surface) In another preferred embodiment, the coefficient of dynamic friction of the resin film in the non-printed portion on the outer surface (outer surface facing outward) of the gusset bag is, for example, in the range of 0.01 to 0.5, 0.05 to 0.4, or 0.1 to 0.3. If this coefficient of dynamic friction is less than 0.01, the bag tends to slip under vacuum during opening, resulting in insufficient opening of the gusset bag and a tendency for packaging defects to occur. If this coefficient of dynamic friction exceeds 0.5, when the roll product 1 is filled into a cardboard box or the like for transport, blocking occurs where smooth surfaces stick together, which tends to reduce the commercial value of the roll product 1. The coefficient of dynamic friction of the resin film can be measured in accordance with JIS K 7125 1999.

[0029] <The Gazette Section> As described above, the intermediate section 30 is composed of two slanted sections 31 and a top section 32. The two slanted sections 31 have one end rising from the upper ends of one and the other of the opposing storage section 20 of the gusset bag, becoming closer together as they go upwards, and their other ends are joined at the top section 32, forming a gusset section 35b where the other opposing resin film of the storage section 20 is folded inward and the resin film overlaps. The side of the storage section 20 on which the resin film is folded is the gusset section 35a, and the area on both sides in the width direction of the handle section 40 where the resin film overlaps is the gusset section 35c. Thus, the gusset section 35 extends from the storage section 20 (gusset section 35a) through the intermediate section 30 (gusset section 35b) to the handle section 40 (gusset section 35c). Each of the two inclined surfaces 31 has an outer surface facing outwards and an inner surface facing the top surface of the storage section 20. The outer surface and / or inner surface are provided with printed areas, as necessary, consisting of single-color or multi-color inks, and including characters, patterns, combinations thereof, markings, etc.

[0030] (Print area ratio and gusset ratio) The gusset portion 35 (here, the sum of the gusset portion 35a in the storage portion 20 and the gusset portion 35b in the intermediate portion 30) has a printing area ratio in the range of 20% to 95%, preferably 30% to 95%, and more preferably 40% to 95%, and the gusset ratio is in the range of 20% to 95%, preferably 30% to 95%, and more preferably 40% to 95%. Here, the printing area ratio is the percentage (%) of the total area of ​​the printed portion provided on the gussets 35a and 35b relative to the total area of ​​the storage portion 20 and the intermediate portion 30, or the percentage of the total area of ​​the printed portion relative to the total area of ​​the gusset bag (excluding the handle portion 40).

[0031] Figure 4 shows a horizontal cross-sectional view of the gusset portion 35b. In a gusset bag, the outer resin film AB overlaps with the innerly folded resin film AF to form a double gusset portion, which is the gusset portion 35b. The other three gusset portions 35b are also gusset portions where the resin film overlaps on the outside and inside. In Figure 4, the gusset ratio (%) is expressed as (length of side AF + length of side EF + length of side BC + length of side CD) ÷ (length of side AB + length of side DE) × 100.

[0032] Based on Figure 5, the reason for setting the gusset ratio to between 20% and 95% is explained. When the gusset ratio is within the aforementioned range, as shown in Figure 5(a), sides AF and EF are of an appropriate length (the distance between folds A, E, and F is of an appropriate length), and even when the roll 10 is stored in the gusset bag, there is room for the resin film to expand, making the resin film very resistant to tearing, and the same applies to folds B, C, and D. When the gusset ratio is less than 20%, as shown in Figure 5(b), the distance between folds A, E, and F, and the distance between folds B, C, and D become too short, requiring a relatively large stress to expand the resin film when the roll 10 is stored in the gusset bag, and the resin film tends to tear easily when opening by suction and during packaging. On the other hand, when the gusset ratio exceeds 95%, as shown in Figure 5(c), variations in the inward folding of the resin film can cause folds C and F to come into very close proximity, leading to a tendency for pseudo-adhesion to occur, and consequently, blocking is more likely to occur when opening the film.

[0033] <Role> As shown in Figure 2, the roll 10 packaged in the gusset bag is made by winding a long paper sheet 2 into a roll, where the reference numeral "21a" indicates the front surface of the sheet 2 and "21b" indicates the back surface of the sheet 2. In this embodiment, these are toilet rolls, kitchen towel rolls, etc. The dimensions of the toilet rolls and kitchen towel rolls are not particularly limited and are appropriately selected according to the paper quality of the sheet 2, so the dimensions of the gusset bag should be selected according to these dimensions.

[0034] For example, in the case of a toilet roll, the basis weight is, for example, in the range of 16 g / m to 24 g / m for a 1-ply product, 17 g / m to 23 g / m, 18 g / m to 22 g / m; in the case of a 2-ply product, it is in the range of 12 g / m to 19 g / m, 13 g / m to 18 g / m, 14 g / m to 17 g / m. The roll length is, for example, for a 1-ply product, in the range of 75 m to 130 m, 75 m to 120 m, or 75 m to 101 m; for a 2-ply product, it is in the range of 37.5 m to 90 m, 37.5 m to 85 m, or 37.5 m to 76 m. The roll diameter DR is, for example, in the range of 100 mm to 140 mm, 107 mm to 135 mm, or 112 mm to 120 mm, and the core outer diameter DI can be selected as appropriate. For example, in the case of a kitchen towel roll, the basis weight is in the range of 16 g / m to 24 g / m, 17 g / m to 23 g / m, 18 g / m to 22 g / m. The roll length is, for example, in the range of 15 m to 40 m, 21 m to 35 m, or 25 m to 31 m. The roll diameter DR is, for example, in the range of 113 mm to 180 mm, 135 mm to 170 mm, or 140 mm to 160 mm, and the core outer diameter DI can be selected as appropriate. 2 to 24 g / m 2 and below, 17 g / m 2 to 23 g / m 2 and below, 18 g / m 2 to 22 g / m 2 and below, and for example, in the case of a 2-ply product, 12 g / m 2 to 19 g / m 2 and below, 13 g / m 2 to 18 g / m 2 and below, 14 g / m 2 to 17 g / m 2 and below, and the roll length is, for example, for a 1-ply product, in the range of 75 m or more and 130 m or less, 75 m or more and 120 m or less, or 75 m or more and 101 m or less; for a 2-ply product, it is in the range of 37.5 m or more and 90 m or less, 37.5 m or more and 85 m or less, or 37.5 m or more and 76 m or less. The roll diameter DR is, for example, in the range of 100 mm or more and 140 mm or less, 107 mm or more and 135 mm or less, or 112 mm or more and 120 mm or less, and the core outer diameter DI can be selected as appropriate. 2 to 24 g / m 2 and below, 17 g / m 2 to 23 g / m 2 and below, 18 g / m 2 to 22 g / m 2 and below, and the roll length is, for example, in the range of 15 m or more and 40 m or less, 21 m or more and 35 m or less, or 25 m or more and 31 m or less. The roll diameter DR is, for example, in the range of 113 mm or more and 180 mm or less, 135 mm or more and 170 mm or less, or 140 mm or more and 160 mm or less, and the core outer diameter DI can be selected as appropriate.

[0035] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments and examples. It will be obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention. [Examples]

[0036] This embodiment will be described in more detail below with reference to examples and comparative examples.

[0037] <Examples 1-15 and Comparative Examples 1-8> Gusset bags made from resin films having the characteristics shown in Tables 1 and 2 were prepared and subjected to the following evaluation. The results are shown in Tables 1 and 2. Note that Example 4 used a resin film made of 90% by mass of polyester resin and 10% by mass of polypropylene resin, Example 5 used a resin film made of 60% by mass of polyester resin and 40% by mass of polypropylene resin, Comparative Example 2 used a resin film made of 30% by mass of polyester resin and 70% by mass of polypropylene resin, and Comparative Example 3 used a resin film made of 75% by mass of polyester resin and 25% by mass of polypropylene resin.

[0038] <Evaluation Method> (Difficulty in blocking) A test specimen was cut to a width of 50 mm and a length of 70 mm. A 10 kg plate with a larger base area than the test specimen was placed on top, and the specimen was left undisturbed in a 40°C constant temperature chamber for 72 hours. After being removed from the constant temperature chamber and allowing the test specimen to cool to room temperature, the maximum peel strength (N / 50 mm) and the presence or absence of peeling noise were evaluated using a tensile testing machine at a speed of 300 mm / min according to the following criteria. ◎...Not bonded, making it impossible to measure peel strength (0N / 50mm) ○...No peeling noise, peeling strength of 3N / 50mm or less △···No peeling noise, peeling strength of 3-6N / 50mm ×...A peeling sound occurs or the peeling strength is 7N / 50mm or more.

[0039] (Difficulty opening the mouth) The frequency of opening defects when packaging 1000 packs using a packaging machine was measured and evaluated according to the following criteria. ◎...No opening failures occurred (0 times) ○...Poor opening occurs 1 to 5 times. △···Opening failure occurs 6 to 9 times ×...More than 10 instances of opening failure occurred.

[0040] (The aesthetic appeal of printing) The presence or absence of ink leakage was visually inspected and evaluated according to the following criteria. ◎...Zero ink bleeds per sheet of packaging film. ○...There are 1-2 ink defects per sheet of packaging film. △···There are 3-4 ink defects per sheet of packaging film. ×...There are four or more ink defects per sheet of packaging film.

[0041] (Seal strength) While holding the gusseted packaging of a toilet roll with a finger hooked onto it, the roll was swung up and down (swinging was performed at a speed of 2 times per second with a 10 cm stroke), and the number of times until the handle broke was recorded and evaluated according to the following criteria. ◎...Does not break even after more than 100 operations. ○...Breaks after 50-99 operations △···Breaks after 21-49 cycles ×...Breaks within 20 uses

[0042] [Table 1]

[0043] [Table 2]

[0044] Tables 1 and 2 show that by using a resin film having the configuration of this embodiment, even if the resin film contains biomass-based resin material, the occurrence of printing defects, opening defects, and unopening defects, as well as pseudo-adhesion between the roll and the resin film, can be significantly suppressed, resulting in a high-quality, environmentally friendly roll product. [Explanation of Symbols]

[0045] 1 roll product 10 rolls 20 Storage compartments 30 Middle section 31 Sloping section 32 Top 35, 35a, 35b, 35c Gusset section 40 Handle 41 Finger insertion hole 42 perforations 50 gusseted bags 51 Suction Pads 52 Gazette Section 53 Printing Department

Claims

1. A roll product in which a long sheet of paper is wound into a roll and then packaged in a gusseted bag, The gusseted bag comprises a storage section for storing the roll, an intermediate section rising upward from the upper end of the storage section, gusseted sections located on both sides in the width direction of the storage section and the intermediate section, a handle section rising upward from the top of the intermediate section, and a printed section provided on the surface of the storage section and / or the gusseted section. The gusseted bag is made up of a resin film, The aforementioned resin film contains biomass-derived raw materials in an amount of 1% to 75% by mass of the total raw materials, and is made solely of polyethylene. The Young's modulus of the resin film in the TD direction is 150 MPa or more and 600 MPa or less. A roll product in which the printing area ratio in the gusset portion is 20% or more and 95% or less, and the gusset ratio is 30% or more and 95% or less.

2. The roll product according to claim 1, wherein the coefficient of dynamic friction of the unprinted inner surface of the gusset bag is 0.01 or more and 0.5 or less.

3. The roll product according to claim 1 or 2, wherein the ratio of the area of ​​the printed portion to the total surface area of ​​the gusset bag excluding the handle portion is 20% or more.

4. The roll product according to any one of claims 1 to 3, wherein the thickness of the resin film is 20 μm or more and 60 μm or less.

5. The roll product according to any one of claims 1 to 4, wherein the Young's modulus of the resin film in the MD direction is 100 MPa or more and 400 MPa or less.

6. The roll product according to any one of claims 1 to 5, wherein the coefficient of dynamic friction of the non-printed portion on the surface of the gusset bag where the printed portion is not formed is 0.01 or more and 0.50 or less.

7. The roll product according to any one of claims 1 to 6, wherein the roll is a toilet roll or a kitchen towel roll.

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