Paper towel wrapper package

Abstract

To provide a paper towel packaging body package capable of stably packaging a paper towel roll when doubly packaging the paper towel roll formed by winding paper excellent in water absorbency in a roll shape with two outer packaging films.SOLUTION: The present disclosure provides a paper towel wrapping body package 10 in which two to eight paper towel wrapping bodies 20, each of which is obtained by wrapping two to six paper towel rolls 30 with a first covering film 40, are wrapped with a second covering film 50, wherein the paper towel roll 30 is obtained by winding a paper towel in which a sheet is laminated in two plies or three plies into a roll shape, the amount of water absorption is 300g / m2 or more and 600g / m2 or less, the winding radius is 127mm or more and 180mm or less, the roll mass <with core> is 230g or more and 555g or less, the dynamic friction coefficient between the exterior films is 0.12 or more and 0.24 or less, and the value represented by (winding hardness) / (dynamic friction coefficient) is 6 or more and 30 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to paper towel wrapper packages. [Background technology]

[0002] 2. Description of the Related Art Generally, roll products such as kitchen towels and toilet paper are packaged together in a polyethylene film.

[0003] For example, Patent Document 1 discloses a toilet roll package in which 10 toilet rolls are gusset-packaged with an exterior film. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-116302 Summary of the Invention [Problem to be solved by the invention]

[0005] The ease of packaging a roll product (hereinafter sometimes simply referred to as "roll") depends on the slipperiness of the exterior film. If the exterior film is too slippery or too non-slip, for example, the position of the roll inside will become unstable, resulting in an unstable package. Furthermore, the package will also become unstable when transported on a conveyor.

[0006] The slipperiness of the exterior film is evaluated by the coefficient of friction, and it is known that the coefficient of friction can be adjusted by adding slip agents to the exterior film. In addition, the tightness of the exterior film of the package and the mass and density of the roll inside also affect the packaging properties, so the coefficient of friction is adjusted taking these factors into consideration.

[0007] High-quality kitchen towels made using TAD (Through Air Dryer, Through Air Drying) papermaking technology have excellent water absorption. With TAD, the paper has an uneven surface and is thick, which results in a low roll density. However, the roll is tightly wound, so the coefficient of friction of the outer film can be adjusted to match the roll specifications.

[0008] However, when a roll is wrapped in an exterior film to obtain a package, and then a plurality of these packages are bundled together and further wrapped in an exterior film from the outside to form a package, the slipperiness between the inner and outer exterior films cannot be optimized, and the packaging is unstable. Thus, when a paper towel roll made of highly absorbent paper wound into a roll is double-wrapped with two exterior films, it is difficult to stably package it.

[0009] Therefore, the present disclosure aims to provide a paper towel packaging package that can stably package a paper towel roll made of highly absorbent paper wound into a roll when double-wrapped in two outer films. [Means for solving the problem]

[0010] In order to solve the above problems, a first aspect of the present invention is a paper towel package package in which 2 to 6 paper towel rolls are packaged together in a first exterior film, and 2 to 8 paper towel packages are packaged together in a second exterior film, the paper towel roll being a paper towel made by laminating sheets in two or three plies and wound into a roll, and the water absorption per unit area of ​​the paper towel is 300 g / m 2 More than 600g / m 2The roll diameter of the paper towel roll is 127 mm or more and 180 mm or less, the roll mass including the core per 280 mm width of the paper towel roll is 230 g or more and 555 g or less, the coefficient of dynamic friction between the outer surface of the first outer film and the inner surface of the second outer film is 0.12 or more and 0.24 or less, and the value represented by the following formula (1) is 6 or more and 30 or less. (the tightness of the paper towel roll) / (the coefficient of dynamic friction) (1)

[0011] A second aspect of the present invention is the paper towel wrapper package of the first aspect, wherein the basis weight of the paper towels is 30 g / m 2 More than 56g / m 2 The following is the result.

[0012] A third aspect of the present invention is the paper towel packaging package of the first aspect or the second aspect, wherein the value represented by the following formula (2) is 35 or more and 90 or less. (the roll mass) × (the dynamic friction coefficient) (2)

[0013] A fourth aspect of the present invention is the paper towel wrapper package of the first aspect or the second aspect, wherein the roll density of the paper towel roll is 0.04 g / cm 3 More than 0.13g / cm 3 The following is the result.

[0014] A fifth aspect of the present invention is the paper towel packaging package of the first aspect or the second aspect, wherein the value represented by the following formula (3) is 0.007 or more and 0.020 or less. (roll density of the paper towel roll) × (coefficient of dynamic friction) (3)

[0015] A sixth aspect of the present invention is the paper towel wrapper package of the first aspect or the second aspect, wherein the tightness of the roll of paper towels is 1.0 mm or more and 5.0 mm or less.

[0016] A seventh aspect of the present invention is a paper towel wrapper package of the first aspect or the second aspect, wherein the percentage of the actual circumference of the first outer film to the theoretical circumference calculated from the roll diameter of the paper towel roll ((actual circumference / theoretical circumference) x 100(%)) is 94% or more and 102% or less.

[0017] An eighth aspect of the present invention is the paper towel package of the first aspect or the second aspect, wherein the packaging of the paper towel package with the first exterior film is a caramel packaging.

[0018] A ninth aspect of the present invention is the paper towel wrapper package of the first aspect or the second aspect, wherein the paper towel has an uneven pattern derived from the papermaking process, different from the embossed pattern.

[0019] A tenth aspect of the present invention is the paper towel wrapper package of the first aspect or the second aspect, wherein the specific volume of the paper towels is 7 cm 3 / g or more 23cm 3 / g or less.

[0020] An eleventh aspect of the present invention is the paper towel wrapper package of the first aspect or the second aspect, wherein the roll length of the paper towel roll is 18 m or more and 45 m or less.

[0021] A twelfth aspect of the present invention is the paper towel wrapper package of the first aspect or the second aspect, wherein the thickness of the first exterior film is 18 μm or more and 52 μm or less.

[0022] A thirteenth aspect of the present invention is the paper towel wrapper package according to the first aspect or the second aspect, wherein the thickness of the second exterior film is 28 μm or more and 65 μm or less. [Effects of the Invention]

[0023] According to the present disclosure, it is possible to provide a paper towel wrapper package that can stably package a paper towel roll made of highly absorbent paper wound into a roll when the roll is double-wrapped with two outer films. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a perspective view of a paper towel wrapper package according to one embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a perspective view of a paper towel package. [Figure 3] FIG. 10 is a perspective view showing a modified example of the paper towel package. [Figure 4] FIG. 10 is an explanatory diagram showing a modified example of the paper towel wrapper package. [Figure 5] FIG. 1 is a perspective view of a paper towel roll. [Figure 6] FIG. 1 is an explanatory diagram of a method for measuring the water absorption of a paper towel. [Figure 7] FIG. 10 is a diagram showing an example of an embossing pattern. [Figure 8] 1A and 1B are diagrams showing examples of radial embossing and closed-ring structure embossing of an embossing pattern. [Figure 9] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 10] FIG. 1 is a graph showing a height profile on the XY plane obtained by a microscope. [Figure 11] FIG. 10 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 12] FIG. 1 is a diagram showing a part of a paper towel roll manufacturing process. DETAILED DESCRIPTION OF THE INVENTION

[0025] An embodiment of the present invention will be described in detail below, but the following embodiment is presented for illustrative purposes, and the present invention is not limited to the embodiment described below. Note that the axial direction refers to the axial direction of the paper towel roll, which is the X direction in the drawings. The Y direction refers to the direction intersecting (perpendicular to) the axial direction (X direction). The Z direction refers to the direction intersecting (perpendicular to) both the axial direction (X direction) and the Y direction. In the following description, the axial direction may also be referred to as the X direction. The term "product ply" refers to the number of plies in a paper towel. For example, if two sheets are stacked and wound to produce paper towels, the product plies will be two. If the number of plies is not specified, the product plies will be used.

[0026] FIG. 1 is a perspective view of a paper towel package according to one embodiment of the present invention. FIG. 2 is a perspective view of a paper towel package. FIG. 3 is a perspective view of a modified paper towel package. FIG. 3(a) shows two paper towel rolls arranged in the Y direction and packaged. FIG. 3(b) shows four paper towel rolls arranged in the Y direction and packaged. FIG. 3(c) shows two rolls arranged in the Y direction and then arranged in two rows in the Z direction, for a total of four rolls packaged. FIG. 3(d) shows three rolls arranged in the Y direction and then arranged in two rows in the Z direction, for a total of six rolls packaged. FIG. 4 is an explanatory diagram showing a modified paper towel package. FIG. 4(a) shows three paper towel packages of FIG. 2 arranged in the Z direction and packaged. FIG. 4(b) shows five paper towel packages of FIG. 2 arranged in the Z direction and packaged. FIG. 4(c) shows two paper towel packages of FIG. 3(a) arranged in the Y direction and two in the Z direction (a total of four rolls) packaged. FIG. 4(d) shows the paper towel packages of FIG. 3(a) arranged two in the Y direction and three in the Z direction (six packages in total) in a package. FIG. 4(e) shows the paper towel packages of FIG. 3(a) arranged two in the Y direction and four in the Z direction (eight packages in total) in a package. FIG. 4(f) shows the paper towel packages of FIG. 3(a) arranged four in the Z direction (four packages in a package). FIG. 4(g) shows the paper towel packages of FIG. 3(b) arranged two in the Z direction (two packages in a package). FIG. 4(h) shows the paper towel packages of FIG. 3(b) arranged three in the Z direction (three packages in a package). FIG. 4(i) shows the paper towel packages of FIG. 3(b) arranged four in the Z direction (four packages in a package). FIG. 4(j) shows the paper towel packages of FIG. 3(c) arranged two in the Y direction (two packages in a package). FIG. 4(k) shows the paper towel packages of FIG. 3(c) arranged three in the Y direction (three packages in a package). Figure 4(l) shows the paper towel packages of Figure 3(c) arranged two in the Y direction and two in the Z direction (four in total) in a package. Figure 4(m) shows the paper towel packages of Figure 3(d) arranged two in the Z direction in a package. Figure 4(n) shows the paper towel packages of Figure 3(d) arranged three in the Z direction in a package. Figure 5 is a perspective view of a paper towel roll.

[0027] <Paper towel packaging> As shown in FIGS. 1 and 4, the paper towel package 10 according to this embodiment is a film-packaged (hereinafter simply referred to as "packaged") package of 2 to 8 paper towel packages 20 bundled together in an exterior film (second exterior film 50). As shown in FIGS. 2 and 3, the paper towel package 20 is a package of 2 to 6 paper towel rolls 30 bundled together in an exterior film (first exterior film 40). That is, the paper towel package 10 is a package of 2 to 8 paper towel packages 20, each of which is made by wrapping 2 to 6 paper towel rolls 30 together in the first exterior film 40, and then wrapping the resulting package together in the second exterior film 50. In this way, the paper towel package 10 includes an inner exterior film (first exterior film 40) that directly wraps the multiple paper towel rolls 30 to form the paper towel package 20, and an outer exterior film (second exterior film 50) that wraps the multiple paper towel packages 20.

[0028] <Second exterior film> As shown in Figure 1, second exterior film 50 on the outside of paper towel package 10 is a resin film that packages multiple paper towel packages 20. Second exterior film 50 covers multiple paper towel packages 20 that are bundled together in a predetermined state from all directions. In this embodiment, paper towel packages 20 in which three paper towel rolls 30 are arranged in the Y direction are packaged in four rolls in the Z direction with second exterior film 50.

[0029] Examples of resin films used for the second exterior film 50 include LDPE (low-density polyethylene), LLDPE (linear low-density polyethylene), HDPE (high-density polyethylene), CPP (coated polypropylene), and films obtained by blending or mixing these materials. These films may also be laminated, coated, or multi-layered with other materials. Examples of such other materials include OPP (oriented polypropylene), EVOH (ethylene-vinyl alcohol copolymer), Ny (nylon), PET (polyethylene terephthalate), and PVDC (polyvinylidene chloride). Among these, LLDPE, LDPE, or a mixture thereof is preferred for the resin film used for the second exterior film 50. By using LLDPE, LDPE, or a mixture thereof for the resin film used for the second exterior film 50, stable packaging is possible even when multiple paper towel packages 20 are packaged. Furthermore, the paper towel roll 30 can be packaged tightly and with reduced deformation.

[0030] (Paper towel packaging) The second exterior film 50 has heat-sealed portions 50a on both sides in the Z direction of the paper towel package 10. As shown in Fig. 1, for example, the packaging using the second exterior film 50 of this embodiment is pillow packaging. Pillow packaging allows for stable packaging.

[0031] Pillow packaging is well known. For example, a plurality of paper towel packages 20 are placed on or under a sheet-like second exterior film 50, and the second exterior film 50 is then wound into a cylindrical shape to encase the plurality of paper towel packages 20. At the overlapping portions of both ends of the second exterior film 50, the outer surface of the inner film and the inner surface of the outer film are bonded (heat sealed, for example) (not shown). At this time, the second exterior film 50 is wound into a cylindrical shape extending in the Z direction. Then, the openings on both sides of the cylindrically wound second exterior film 50 in the Z direction are gusset-folded and heat-sealed horizontally in the Y direction, and the sealed portions are cut into individual bags. This results in heat-sealed portions 50a on both sides of the second exterior film 50 in the Z direction. Furthermore, as in this embodiment, it is preferable to provide gusset portions 50b on both widthwise sides of the heat-sealed portions 50a.

[0032] (Thickness of the second exterior film) The thickness of the second exterior film 50 is preferably 28 μm or more and 65 μm or less. If the thickness of the second exterior film 50 is less than 28 μm or more than 65 μm, it becomes difficult to set the coefficient of dynamic friction between the exterior films (the first exterior film 40 and the second exterior film 50) (described later) within a predetermined range, making packaging difficult. The lower limit of the above range of the thickness of the second exterior film 50 is more preferably 33 μm or more, and even more preferably 38 μm or more. The upper limit of the above range of the thickness of the second exterior film 50 is more preferably 55 μm or less, and even more preferably 48 μm or less. The thickness of the second exterior film 50 is measured in accordance with JIS K 7130.

[0033] (Number of packs of paper towel wrappers in a paper towel wrapper package) As shown in FIGS. 1 and 4, the paper towel package 10 has two to eight paper towel packages 20 packaged together in the second exterior film 50. If the number of paper towel packages 20 in the paper towel package 10 (hereinafter referred to as the "number of packs") is one pack, the contents of the paper towel package 10 will be too small and difficult to package in the second exterior film 50. On the other hand, if the number of packs in the paper towel package 10 is nine or more, the contents of the paper towel package 10 will be too large and difficult to package in the second exterior film 50. The lower limit of the above range of the number of packs in the paper towel package 10 is preferably three or more. The upper limit of the above range of the number of packs in the paper towel package 10 is preferably six or less. As shown in FIG. 1, the number of packs in the paper towel package 10 is most preferably four.

[0034] (Number of rolls in a paper towel package) As shown in FIGS. 1 and 4, the number of paper towel rolls 30 contained in the paper towel package 10 is preferably 8 to 18 rolls. If the number of rolls in the paper towel package 10 is 7 or less, at least one of the contents of the paper towel package 10 and the contents of the paper towel packages 20 will be too small, making packaging difficult. On the other hand, if the number of rolls in the paper towel package 10 is 19 or more, at least one of the contents of the paper towel package 10 and the contents of the paper towel packages 20 will be too large, making packaging difficult. The lower limit of the above range of the number of rolls in the paper towel package 10 is more preferably 10 rolls or more. The upper limit of the above range of the number of rolls in the paper towel package 10 is more preferably 16 rolls or less. As shown in FIG. 1, the most preferred number of rolls in the paper towel package 10 is 12 rolls.

[0035] <Paper towel packaging> As shown in FIGS. 2 and 3, the paper towel package 20 is made by packaging two to six paper towel rolls 30 together in an exterior film (first exterior film 40).

[0036] (Number of rolls in paper towel packaging) As shown in FIGS. 2 and 3, the paper towel package 20 contains two to six rolls of paper towel rolls 30 packaged together in a first exterior film 40. If the number of paper towel rolls 30 contained in the paper towel package 20 (hereinafter referred to as the "number of rolls") is one roll, the contents of the paper towel package 20 will be too small and difficult to package with the first exterior film 40. On the other hand, if the number of rolls of the paper towel package 20 is seven or more, the contents of the paper towel package 20 will be too large and difficult to package with the first exterior film 40. The lower limit of the above range of the number of rolls of the paper towel package 20 is preferably three rolls or more. The upper limit of the above range of the number of rolls of the paper towel package 20 is preferably four rolls or less. As shown in FIG. 2, the number of rolls of the paper towel package 20 is most preferably three rolls.

[0037] <First exterior film> 2, first exterior film 40 on the inside of paper towel package 10 is a resin film that packages multiple paper towel rolls 30 together. In this embodiment, first exterior film 40 covers, from all directions, three paper towel rolls 30 that are arranged linearly in the Y direction and in one row in height (X direction).

[0038] Examples of resin films used for the first exterior film 40 include LDPE, LLDPE, HDPE, CPP, and films obtained by blending or mixing these materials. These films may also be laminated, coated, or multi-layered with other materials. Examples of such other materials include OPP, EVOH, Ny, PET, and PVDC. Among these, LLDPE, LDPE, or a mixture thereof is preferred for the resin film used for the first exterior film 40. By using LLDPE, LDPE, or a mixture thereof for the resin film used for the first exterior film 40, the highly absorbent, soft paper towel roll 30 can be packaged stably. Furthermore, the paper towel roll 30 can be packaged tightly and with reduced deformation.

[0039] (Paper towel packaging) As shown in Figure 2, the packaging of the paper towel package 20 with the first exterior film 40 is preferably caramel packaging. Caramel packaging allows for stable packaging and also makes it easier to maintain the tightness of the packaging.

[0040] Caramel packaging is well known. For example, multiple paper towel rolls 30 to be packaged are placed side by side in a folded state on a sheet-like first exterior film 40, and the first exterior film 40 is wrapped around the paper towel rolls 30 in a circumferential direction along the periphery to form a tube (a tube extending in the X direction). Two opposing flap-shaped edges of the first exterior film 40 that extend beyond both ends of the axial direction (X direction) of the paper towel roll 30 are folded toward each other, and then two other opposing flap-shaped edges are similarly folded toward each other, and these folded portions are sealed by heat sealing or the like. Alternatively, for example, three paper towel rolls 30 arranged so that their axial directions are parallel to each other are raised from below the set sheet-like first exterior film 40 to the sheet surface (lower surface side) of the first exterior film 40. In this state, it is preferable to wrap the first exterior film 40 around the circumferential surface of the paper towel roll 30 to form a cylindrical shape, and heat seal (not shown) the overlapping portions of both ends of the first exterior film 40 on the circumferential surface of the paper towel roll 30 along the axial direction (X direction). In this way, both axial end faces of the caramel-wrapped paper towel roll 30 are positioned on approximately the same plane. Note that the packaging using the first exterior film 40 is not limited to caramel packaging, and may be, for example, gusset packaging.

[0041] (Thickness of the first exterior film) The thickness of the first exterior film 40 is preferably 18 μm or more and 52 μm or less. If the thickness of the first exterior film 40 is less than 18 μm or more than 52 μm, it becomes difficult to set the coefficient of dynamic friction between the exterior films (first exterior film 40 and second exterior film 50) described below within a predetermined range, making packaging difficult. The lower limit of the above range of the thickness of the first exterior film 40 is more preferably 21 μm or more, and even more preferably 25 μm or more. The upper limit of the above range of the thickness of the first exterior film 40 is more preferably 45 μm or less, and even more preferably 35 μm or less. The thickness of the first exterior film 40 is measured in accordance with JIS K 7130.

[0042] (Coefficient of dynamic friction between exterior films) The coefficient of dynamic friction between the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 (hereinafter referred to as the "coefficient of dynamic friction between the exterior films") is 0.12 or more and 0.24 or less. If the coefficient of dynamic friction between the exterior films is less than 0.12, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will slide too much, making packaging difficult. On the other hand, if the coefficient of dynamic friction between the exterior films is greater than 0.24, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will not slide too much, making packaging difficult. The lower limit of the above range of the coefficient of dynamic friction between the exterior films is preferably 0.14 or more, and more preferably 0.15 or more. The upper limit of the above range of the coefficient of dynamic friction between the exterior films is preferably 0.21 or less, and more preferably 0.18 or less.

[0043] (Method for measuring the coefficient of dynamic friction between exterior films) The dynamic friction coefficient between the exterior films is the dynamic friction coefficient between the inner surface of the second exterior film 50 and the outer surface of the first exterior film 40, and is measured in accordance with ISO 15359 using an "Automatic Friction Tester NSF-100" manufactured by Nomura Shoji Co., Ltd. Measurements of the dynamic friction coefficient between the exterior films are performed three times for each sample, with the third measurement taken as the data. For one type of sample, the dynamic friction coefficient in the Y direction (CD direction in this case) of the first exterior film 40 and the Z direction (MD direction in this case) of the second exterior film 50 is measured five times (the data from the third of the three measurements is taken and counted as one measurement, for a total of five measurements), and the average is used as the dynamic friction coefficient between the exterior films. A single sample for the five measurements is taken from one second exterior film 50 and one first exterior film 40; however, if there are not enough samples, multiple second exterior films 50 and multiple first exterior films 40 may be used.

[0044] (Theoretical circumference of the first exterior film) The theoretical circumference of the first exterior film 40 (hereinafter simply referred to as "theoretical circumference") calculated from the roll diameter DR of the paper towel roll 30 (see FIG. 5) is preferably 900 mm or more and 1250 mm or less. If the theoretical circumference of the first exterior film 40 is smaller than 900 mm, the basis weight will be low, the roll diameter DR will be small, and water absorbency will be poor. On the other hand, if the theoretical circumference of the first exterior film 40 is larger than 1250 mm, the roll diameter DR will be too large, making packaging difficult. The lower limit of the above range of the theoretical circumference of the first exterior film 40 is more preferably 950 mm or more, and even more preferably 1000 mm or more. The upper limit of the above range of the theoretical circumference of the first exterior film 40 is more preferably 1200 mm or less, and even more preferably 1150 mm or less.

[0045] The theoretical circumference of first exterior film 40 is the theoretical circumference of first exterior film 40 of paper towel package 20 when viewed from the axial direction (X direction), and is calculated from roll diameter DR of paper towel roll 30. For example, as shown in Fig. 2, when three rolls of paper towel rolls 30 are arranged linearly in the Y direction, the theoretical circumference of first exterior film 40 is made up of two halves of the circumference of paper towel roll 30 that make up the semicircular portions on both sides in the Y direction (roll diameter DR x pi (3.14) / 2 x 2) and eight radii of paper towel roll 30 that make up the linear portions on both sides in the Z direction (roll diameter DR / 2 x 8).

[0046] (Actual circumference of the first exterior film) The actual circumferential length of the first exterior film 40 is preferably 880 mm or more and 1230 mm or less. If the actual circumferential length of the first exterior film 40 is smaller than 880 mm, the basis weight of the paper towel 30a will be low, the roll diameter DR will be small, and water absorbency will be poor. On the other hand, if the actual circumferential length of the first exterior film 40 is larger than 1230 mm, the roll diameter DR will be too large, making packaging difficult. The lower limit of the above range of the actual circumferential length of the first exterior film 40 is more preferably 940 mm or more, and even more preferably 990 mm or more. The upper limit of the above range of the actual circumferential length of the first exterior film 40 is more preferably 1190 mm or less, and even more preferably 1140 mm or less.

[0047] The actual circumference of the first exterior film 40 is measured. It is found by measuring the circumference near the center of the height direction (axial direction) of the first exterior film 40 with a ruler or the like (tape measure or the like). Note that when the packaging is a caramel package as shown in Fig. 2, the packaging film overlaps in part in the circumference direction, but this overlapping part is not included in the circumference.

[0048] (Actual circumference of the first outer film / Theoretical circumference) The percentage of the actual circumference of the first exterior film 40 relative to the theoretical circumference ((actual circumference / theoretical circumference) × 100(%)) is preferably 94% or more and 102% or less. If the percentage of the actual circumference of the first exterior film 40 relative to the theoretical circumference is less than 94%, the packaging will be too tight, the balance between the dynamic friction coefficients of the exterior films will be poor, and packaging will be difficult. On the other hand, if the percentage of the actual circumference of the first exterior film 40 relative to the theoretical circumference is greater than 102%, the packaging will be less tight, the balance between the dynamic friction coefficients of the exterior films will be poor, and packaging will be difficult. The lower limit of the above range of the percentage of the actual circumference of the first exterior film 40 relative to the theoretical circumference is more preferably 96% or more, and even more preferably 97% or more. Furthermore, the upper limit of the above range of the percentage of the actual circumference of the first exterior film 40 relative to the theoretical circumference is more preferably 101% or less, and even more preferably 100% or less.

[0049] <Paper towel roll> 5, paper towel roll 30 is a long paper towel 30a made by stacking sheets in two or three plies and wound into a roll, with a core 31 such as a cylindrical paper tube or cylindrical space in the center. It is preferable that long paper towel 30a has easy-to-tear sections (not shown) such as perforations at predetermined intervals so that it can be cut to a predetermined length.

[0050] (core) Core 31 is located at the center of paper towel roll 30. Core 31 may be a cylindrical paper tube or a cylindrical space. In this embodiment, core 31 of paper towel roll 30 has a cylindrical paper tube made of multiple layers of base paper, and paper towels 30a are wound around this paper tube. In the following description, core 31 refers to a cylindrical cardboard tube unless otherwise specified.

[0051] (Core outer diameter) The outer diameter DI of the core 31 (hereinafter referred to as the "core outer diameter DI") is preferably 28 mm or more and 58 mm or less. If the core outer diameter DI is smaller than 28 mm, the roll density will be low and the roll tightness will be high (soft) to maintain the paper towel roll 30 at a constant roll diameter DR, which will result in an imbalance with the coefficient of dynamic friction between the outer films, making packaging difficult. On the other hand, if the core outer diameter DI is larger than 58 mm, the roll density will be high and the roll tightness will be low (hard) to maintain the paper towel roll 30 at a constant roll diameter DR, which will result in an imbalance with the coefficient of dynamic friction between the outer films, making packaging difficult. The lower limit of the above range of the core outer diameter DI is more preferably 33 mm or more, and even more preferably 40 mm or more. The upper limit of the above range of the core outer diameter DI is more preferably 53 mm or less, and even more preferably 46 mm or less.

[0052] The core outer diameter DI is measured, for example, using a diameter rule manufactured by Muratec KDS Co., Ltd. Three paper towel rolls 30 are measured and the measurement results are averaged. In the case of a paper towel roll 30 that does not have a paper tube core, the diameter of the cylindrical space (center hole) in the center of the paper towel roll 30 is considered to be the core outer diameter DI.

[0053] (core weight) When the core 31 is a cardboard tube, the weight of the core 31 (weight per 280 mm of roll width W; hereinafter referred to as "core weight") is preferably 10 g or more and 25 g or less. If the core weight is less than 10 g, the roll mass (with core) described below becomes low (light), which leads to an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. On the other hand, if the core weight is greater than 25 g, the roll mass (with core) described below becomes high (heavy), which leads to an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. The lower limit of the above core weight range is more preferably 12 g or more, and even more preferably 13 g or more. The upper limit of the above core weight range is more preferably 21 g or less, and even more preferably 17 g or less. If the roll width W is not 280 mm, the weight is converted to the weight per 280 mm by proportional calculation. The core weight is measured by measuring the cores 31 of three paper towel rolls 30 and averaging the measurement results. The roll width W means the length of the paper towel roll 30 in the axial direction (X direction).

[0054] (BKP content of core) The core 31 is preferably a paper tube containing at least one type of BKP (Bleached Kraft Pulp), namely, NBKP (Softwood Kraft Pulp) and LBKP (Broadwood Kraft Pulp), with the weight content of BKP preferably being 60% or more and 100% or less. If the weight content of BKP in the core 31 is less than 60%, the strength of the core 31 (paper tube) decreases, the paper towel roll 30 becomes more easily crushed, and the balance with the dynamic friction coefficient between the exterior films becomes poor, making packaging difficult. The lower limit of the above range of the weight content of BKP in the core 31 is more preferably 70% or more, and even more preferably 80% or more. Furthermore, the weight content of LBKP in the BKP is preferably 60% or more, more preferably 70% or more, and even more preferably 90% or more.

[0055] (reel diameter) The roll diameter DR of the paper towel roll 30 is 127 mm or more and 180 mm or less. If the roll diameter DR is smaller than 127 mm, the basis weight will be low and the water absorbency will be poor. On the other hand, if the roll diameter DR is larger than 180 mm, packaging will be difficult. The lower limit of the above range of the roll diameter DR is preferably 135 mm or more, and more preferably 140 mm or more. The upper limit of the above range of the roll diameter DR is preferably 170 mm or less, and more preferably 157 mm or less. The roll diameter DR is measured by measuring three paper towel rolls 30 and averaging the measurement results.

[0056] (Volume length) The wound length of the paper towel roll 30 (hereinafter sometimes simply referred to as "wound length") is preferably 18 m or more and 45 m or less. If the wound length is shorter than 18 m, the paper towel roll 30 will be too tightly wound (soft) to maintain a certain range of wound diameter DR, which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. On the other hand, if the wound length is longer than 45 m, the paper towel roll 30 will be too tightly wound (hard) to maintain a certain range of wound diameter DR, which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. The lower limit of the above range of wound length is more preferably 20 m or more, and even more preferably 24 m or more. The upper limit of the above range of wound length is more preferably 40 m or less, and even more preferably 35 m or less.

[0057] (roll width) The roll width W (axial length) of the paper towel roll 30 is preferably 150 mm or more and 380 mm or less. If the roll width W is smaller than 150 mm, the amount of water absorbed per sheet will be small. On the other hand, if the roll width W is larger than 380 mm, the amount of water absorbed per sheet will be greater than necessary. The lower limit of the above range of the roll width W is more preferably 200 mm or more, and even more preferably 250 mm or more. The upper limit of the above range of the roll width W is more preferably 340 mm or less, and even more preferably 300 mm or less.

[0058] (roll mass) The roll mass of the paper towel roll 30 including the core (paper tube) 31 per roll width W of 280 mm (hereinafter simply referred to as the "roll mass <with core>") is 230 g or more and 555 g or less. If the roll mass <with core> is less than 230 g, the winding diameter DR of the paper towel roll 30 will be small, resulting in poor water absorbency. Furthermore, to maintain the paper towel roll 30 at a constant winding diameter DR, the winding will be too tight (soft), which will result in an imbalance with the coefficient of dynamic friction between the exterior films, making packaging difficult. On the other hand, if the roll mass <with core> is greater than 555 g, the winding diameter DR of the paper towel roll 30 will be too large, making packaging difficult. Furthermore, to maintain the paper towel roll 30 at a constant winding diameter DR, the winding will be too tight (hard), which will result in an imbalance with the coefficient of dynamic friction between the exterior films, making packaging difficult. The lower limit of the above range of the roll weight (with core) is preferably 265 g or more, more preferably 295 g or more. The upper limit of the above range of the roll weight (with core) is preferably 495 g or less, more preferably 460 g or less. The roll weight (with core) is measured by measuring three paper towel rolls 30 and averaging the measurement results.

[0059] The roll mass of the paper towel roll 30 per 280 mm roll width W, excluding the core 31 (the core that is the paper tube) (hereinafter simply referred to as the "roll mass <without core>"), is preferably 215 g or more and 540 g or less. If the roll mass <without core> is less than 215 g, the basis weight will be low and the winding length will be short, which will result in a small winding diameter DR of the paper towel roll 30 and poor water absorbency. Furthermore, to achieve a constant winding diameter DR of the paper towel roll 30, the winding will be too tight (soft), which will result in an imbalance with the coefficient of dynamic friction between the exterior films and make packaging difficult. On the other hand, if the roll mass <without core> is greater than 540 g, the basis weight will be high and the winding length will be long, which will result in the winding diameter DR of the paper towel roll 30 becoming too large, making packaging difficult. Furthermore, if the paper towel roll 30 is wound to a constant diameter DR, the tightness of the roll will be low (too tight), which will result in an imbalance with the coefficient of dynamic friction between the outer films, making packaging difficult. The lower limit of the above range of roll weight (without core) is preferably 250 g or more, and even more preferably 280 g or more. The upper limit of the above range of roll weight (without core) is preferably 480 g or less, and even more preferably 445 g or less. The roll weight (without core) is measured by measuring three paper towel rolls 30 and averaging the measurement results. In the following description, when simply referred to as "roll weight," this includes both roll weight (with core) and roll weight (without core).

[0060] (winding density) The winding density of the paper towel roll 30 (hereinafter sometimes simply referred to as "winding density") is 0.20 m / cm 2 More than 0.56m / cm 2 The winding density is 0.20 m / cm 2 If the winding density is set to less than 0.56 m / cm, the winding length will be shorter and the roll mass will be lighter, which will cause a poor balance with the coefficient of dynamic friction between the outer film layers, making packaging more difficult. 2If the winding density is greater than 0.24 m / cm, the winding length will be longer and the roll mass will be heavier, which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging more difficult. 2 It is preferable that the thickness is 0.30 m / cm or more. 2 The upper limit of the winding density range is preferably 0.50 m / cm. 2 Preferably, it is 0.45 m / cm or less. 2 More preferably, it is:

[0061] The winding density is expressed by the following formula (1). Winding density = (winding length × number of plies) ÷ (cross-sectional area of ​​paper towel roll 30) (1) The cross-sectional area of ​​the paper towel roll 30 is expressed by the following formula (2). Cross-sectional area of ​​paper towel roll 30=(cross-sectional area of ​​the portion of paper towel roll 30 where the winding diameter is DR)−(cross-sectional area of ​​the portion of the core where the outer diameter is DI) (2) For example, if the winding length is 28.5 m, there are 2 plies, the winding diameter (DR) is 149 mm, and the core outer diameter (DI) is 44 mm, the winding density is (28.5 m × 2) ÷ {3.14 × (149 mm ÷ 2 ÷ 10)} 2 -3.14×(44mm÷2÷10) 2}=0.36m / cm 2 This becomes:

[0062] (roll density) The roll density of the paper towel roll 30 (hereinafter sometimes simply referred to as "roll density") is 0.04 g / cm 3 More than 0.13g / cm 3 The roll density is preferably 0.04 g / cm or less. 3 If the roll density is less than 0.13 g / cm, the roll mass will be low (light), which will cause a poor balance with the coefficient of dynamic friction between the outer films, making packaging difficult. 3 If it is larger than this, the roll mass becomes high (heavy), the balance with the coefficient of dynamic friction between the exterior films becomes poor, and packaging becomes difficult. The lower limit of the above range of roll density is 0.05 g / cm3 More preferably, it is 0.06 g / cm or more. 3 The upper limit of the above range of the roll density is preferably 0.11 g / cm. 3 More preferably, it is 0.09 g / cm or less. 3 It is more preferable that:

[0063] The roll density of the paper towel roll 30 is expressed as (roll mass of the paper towel roll 30 <without core>) / (volume of the paper towel roll 30), and is calculated by the following formula (3). Roll density = roll mass <without core> ÷ [{(cross-sectional area of ​​the roll diameter DR (outer diameter) of the paper towel roll 30) - (cross-sectional area of ​​the core outer diameter DI)} × roll width W (calculated based on 280 mm)] (3) For example, if the roll mass (without core) per roll width W280 mm is 344 g, the reel diameter (DR) is 149 mm, and the core outer diameter (DI) is 44 mm, then the roll density = 344 g ÷ {(3.14 × (149 mm ÷ 2 ÷ 10) 2 -3.14×(44mm÷2÷10) 2 )×(280mm÷10)}=0.077g / cm 3 This becomes:

[0064] (Rolling hardness) When evaluating the tightness of the paper towel roll 30, the tightness of the paper towel roll 30 when held in the hand can be evaluated by evaluating the "tightness of the roll" described below.

[0065] The tightness of the paper towel roll 30 (hereinafter sometimes simply referred to as "tightness") is measured using a compression tester (KES-G5 handy compression tester manufactured by Kato Tech Co., Ltd.) as follows: The direction parallel to the axial direction of the paper towel roll 30 is defined as the height direction, and the direction perpendicular to the tangent to the circumference of the paper towel roll 30 is defined as the radial direction.

[0066] First, the paper towel roll 30 is placed on the table of the testing machine so that the axial direction of the paper towel roll 30 is horizontal. Next, an acrylic plate (4 cm wide, 29 cm long, 2 mm thick) is placed on top of the paper towel roll 30 so that the long side of the acrylic plate is parallel to the axial direction of the roll (approximately 280 mm) (the long side of the acrylic plate is 10 mm longer than the axial length of the roll). At this time, to prevent the paper towel roll 30 from being crushed by the weight of the acrylic plate, the weight of the acrylic plate is set to approximately 27 g for a long side length of 29 cm. Next, the above-mentioned KES-G5 compressor (area 2.0 cm2) is pressed into the center of the acrylic plate in the direction of the 4 cm width and 29 cm long side at a speed of 0.01 cm / sec. The pressure with which the compressor presses the acrylic plate is 1 gf / cm 2 The indentation depth when the pressure is 500gf / cm is T0. 2 The compression depth at this time is defined as Tm, and the difference between Tm and T0 (Tm - T0) is defined as the roll firmness. Next, the paper towel roll 30 is rotated 90 degrees circumferentially around its central axis as the axis of rotation, and the compression depths Tm and T0 are measured in the same manner as above, to determine the difference between Tm and T0 (Tm - T0). In this way, by using an acrylic plate instead of directly compressing the paper towel roll 30 with the compression element, the entire width of the paper towel roll 30 can be compressed, making it possible to evaluate the crushability of the paper towel roll 30 when packaged in the first exterior film 40. Measurements are taken twice (at two angles) for each paper towel roll 30 as described above. That is, for three paper towel rolls 30, each is measured twice, and the average of the six measurement results (= two times per roll x three rolls) is defined as the final roll firmness. Note that a higher value of roll firmness indicates a softer paper towel roll 30, and a lower value indicates a harder paper towel roll 30.

[0067] The tightness of the paper towel roll 30 is preferably 1.0 mm or more and 5.0 mm or less. If the tightness of the paper towel roll 30 is less than 1.0 mm, the paper towel roll 30 will be too tightly wound, which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. On the other hand, if the tightness of the paper towel roll 30 is more than 5.0 mm, the paper towel roll 30 will be too loosely wound, which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. The lower limit of the above range of tightness is more preferably 1.5 mm or more, and even more preferably 2.0 mm or more. The upper limit of the above range of tightness is more preferably 4.0 mm or less, and even more preferably 3.0 mm or less.

[0068] <Paper towels> The paper towel 30a is formed by laminating sheets in two or three plies, and the number of plies of the paper towel 30a is more preferably two.

[0069] (Wet pulp weight content) The paper towel 30a preferably contains wet pulp. When the paper towel 30a contains wet pulp, the specific volume tends to be lower than that of dry pulp, making it easier to package. The paper towel 30a preferably has a wet pulp content (weight content) of 60% or more and 100% or less. If the wet pulp content is less than 60%, the water absorbency of the paper towel 30a will be poor if the basis weight of the paper towel 30a is low. The lower limit of the wet pulp content is more preferably 70% or more, and even more preferably 80% or more.

[0070] (seat length) The length between easily breakable portions (not shown), such as perforations, provided at predetermined intervals on the long paper towel 30a (the length in the direction perpendicular to the roll width W of one sheet of paper towel 30a; hereinafter simply referred to as the "sheet length") is preferably 100 mm or more and 250 mm or less. If the sheet length of the paper towel 30a is made shorter than 100 mm, the amount of water absorbed by each sheet of paper towel 30a will be reduced. On the other hand, if the sheet length of the paper towel 30a is made longer than 250 mm, the amount of water absorbed by each sheet of paper towel 30a will be greater than necessary. The lower limit of the above-mentioned range of the sheet length of the paper towel 30a is more preferably 130 mm or more, and even more preferably 150 mm or more. The upper limit of the above-mentioned range of the sheet length of the paper towel 30a is more preferably 230 mm or less, and even more preferably 210 mm or less.

[0071] (paper thickness) The paper thickness per 10 plies of the paper towels 30a (hereinafter simply referred to as the "paper thickness <10 plies>") is preferably 2.0 mm / 10 plies or more and 4.0 mm / 10 plies or less. If the paper thickness <10 plies> of the paper towels 30a is less than 2.0 mm / 10 plies, the basis weight will be low and the water absorbency will be poor. On the other hand, if the paper thickness <10 plies> of the paper towels 30a is greater than 4.0 mm / 10 plies, the roll diameter DR of the paper towel roll 30 will be too large, making packaging difficult. In addition, the roll weight will be too heavy, making packaging difficult. The lower limit of the above range of the paper thickness <10 plies> of the paper towels 30a is more preferably 2.3 mm / 10 plies or more, and even more preferably 2.6 mm / 10 plies or more. Moreover, the upper limit of the above range of the paper thickness <10 plies> of the paper towel 30a is more preferably 3.6 mm / 10 plies or less, and even more preferably 3.3 mm / 10 plies or less.

[0072] The paper thickness per product ply (2 or 3 plies) of the paper towels 30a (hereinafter simply referred to as the "product ply thickness") is preferably 0.40 mm or more and 0.80 mm or less per product ply. If the product ply thickness of the paper towels 30a is less than 0.40 mm per product ply, the absorbency will be poor. On the other hand, if the product ply thickness of the paper towels 30a is greater than 0.80 mm per product ply, the roll diameter DR of the paper towel roll 30 will be too large, making packaging difficult. In addition, the roll weight will be too heavy, making packaging difficult. The lower limit of the above range of the product ply thickness of the paper towels 30a is more preferably 0.45 mm or more per product ply, and even more preferably 0.50 mm or more per product ply. The upper limit of the above range of the product ply thickness of the paper towels 30a is more preferably 0.72 mm or less per product ply, and even more preferably 0.68 mm or less per product ply.

[0073] The thickness of the paper towel 30a is measured using the following method. A thickness gauge (Ozaki Seisakusho's "PEACOCK" dial thickness gauge) is used. The measurement conditions are a measurement load of 3.7 kPa, a probe diameter of 30 mm, a sample placed between the probe and the measurement table, and the gauge reading when the probe is lowered at a speed of 1 mm per second or less. When measuring the thickness per 10 plies, 10 plies (5 sets of 2-ply sheets) are stacked and measured, and the measurement results are averaged after 10 repeats. For a 3-ply sheet, 9 plies (3 sets of 3-ply sheets) are stacked and measured, and the thickness per ply is calculated from the measurement results and converted to 10 plies. When measuring the thickness per product ply, the thickness per ply is calculated from the measurement results for the 10 or 9 plies and converted to the product ply. The paper thickness is measured at 10 points in total: 5 different points in the MD (transport direction) of the sheet, and 5 points shifted from these 5 points in the CD (width direction). Note that it is important to measure the paper thickness at 10 different points, but the exact positions do not matter.

[0074] (Basic weight) The basis weight of the product ply of the paper towel 30a (hereinafter simply referred to as "basis weight") is 30 g / m 2 More than 56g / m 2 The basis weight of the paper towel 30a is preferably 30 g / m or less. 2 On the other hand, if the basis weight of the paper towel 30a is less than 56 g / m 2 If the basis weight is larger than this, the roll diameter DR of the paper towel roll 30 becomes too large, making packaging difficult. Furthermore, the roll weight becomes too heavy, making packaging difficult. Alternatively, the tightness of the roll becomes low (tight), resulting in an imbalance with the coefficient of dynamic friction between the exterior films, making packaging difficult. The lower limit of the above-mentioned range of the basis weight of the paper towel 30a is 34 g / m. 2 More preferably, it is 38 g / m or more. 2 The upper limit of the above range of the basis weight of the paper towel 30a is 50 g / m 2 More preferably, it is 46 g / m or less. 2 It is more preferable that the basis weight is not more than 10 ...

[0075] (specific volume) The specific volume of the paper towel 30a (hereinafter simply referred to as "specific volume") is 7 cm 3 / g or more 23cm 3 The specific volume of the paper towel 30a is preferably 7 cm 3 If the specific volume of the paper towel 30a is less than 23 cm / g, the absorbency will be poor. 3 If the specific volume is greater than 1 / g, the roll diameter DR of the paper towel roll 30 becomes too large, making packaging difficult. The specific volume of the paper towel 30a is calculated by, for example, dividing the paper thickness of a predetermined number of plies (e.g., product plies) of the paper towel 30a by the basis weight of the predetermined number of plies, and then calculating the volume cm per unit g. 3 The lower limit of the above range of the specific volume of the paper towel 30a is 9 cm 3 / g or more is more preferable, and 12cm 3 The upper limit of the above range of the specific volume of the paper towel 30a is 20 cm3 / g or less is more preferable, and 17cm 3 It is more preferable that the saturation coefficient is 1 / g or less.

[0076] (Tensile strength DMDT) The dry machine direction tensile strength (DMDT) of the paper towel 30a in the dry MD (machine direction) according to JIS P 8113 (hereinafter simply referred to as "tensile strength DMDT") is preferably 7 N / 25 mm or more and 14 N / 25 mm or less. The lower limit of the above range of the tensile strength DMDT of the paper towel 30a is more preferably 8 N / 25 mm or more, and even more preferably 9 N / 25 mm or more. The upper limit of the above range of the tensile strength DMDT of the paper towel 30a is more preferably 13 N / 25 mm or less, and even more preferably 12 N / 25 mm or less.

[0077] (Tensile strength DCDT) The dry cross direction tensile strength (DCDT) of the paper towel 30a in the cross direction (CD) when dry, based on JIS P 8113 (hereinafter simply referred to as "tensile strength DCDT"), is preferably 7 N / 25 mm or more and 14 N / 25 mm or less. The lower limit of the above range of the tensile strength DCDT of the paper towel 30a is more preferably 8 N / 25 mm or more, and even more preferably 9 N / 25 mm or more. The upper limit of the above range of the tensile strength DCDT of the paper towel 30a is more preferably 13 N / 25 mm or less, and even more preferably 12 N / 25 mm or less.

[0078] (Measurement of tensile strength) The tensile strengths DMDT and DCDT of the paper towel 30a are measured as a product ply in accordance with JIS P 8113. For example, they can be measured using a Tensilon universal testing machine STB-1225S (manufactured by A&D Co., Ltd.) according to a method conforming to JIS P 8113. However, the test piece is measured after being maintained in an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1°C, 50±2% RH) with the width direction (direction perpendicular to the tensile direction of the Tensilon universal testing machine) of 25 mm, the distance between grips of 100 mm, and the tensile speed of 50 mm / min.

[0079] (DGMT) The geometric tensile strength (DGMT) of the paper towel 30a, which is the square root of the product of the tensile strength DMDT and the tensile strength DCDT, is preferably 7 N / 25 mm or more and 14 N / 25 mm or less. The lower limit of the above range of the DGMT of the paper towel 30a is more preferably 8 N / 25 mm or more, and even more preferably 9 N / 25 mm or more. The upper limit of the above range of the DGMT of the paper towel 30a is more preferably 13 N / 25 mm or less, and even more preferably 12 N / 25 mm or less. The DGMT of the paper towel 30a is calculated from the tensile strength DMDT and the tensile strength DCDT measured in accordance with JIS P 8113.

[0080] If the tensile strengths DMDT, DCDT, and DGMT are less than the lower limit (7 N / 25 mm) of the above range, the basis weight of the paper towel 30a will be low, resulting in poor absorbency. On the other hand, if the tensile strengths DMDT, DCDT, and DGMT are greater than the upper limit (14 N / 25 mm) of the above range, the basis weight of the paper towel 30a will be high, the roll diameter DR of the paper towel roll 30 will be large, making packaging difficult. In addition, the roll weight will be heavy, making packaging difficult. Or, the roll will be loosely wound (stiff), making packaging difficult.

[0081] (Water absorption amount) Water absorption per unit area of ​​paper towel 30a (g / m 2) is 300g / m 2 More than 600g / m 2 The water absorption per unit area is 300g / m 2 If the paper towel 30a is made smaller than 600 g / m, the basis weight of the paper towel 30a will be low and the water absorption will be poor. 2 If it is larger than this, the basis weight of the paper towel 30a will be high, the roll diameter DR of the paper towel roll 30 will be large, and packaging will be difficult. Also, the roll mass will be heavy, making packaging difficult. Alternatively, the tightness of the roll will be low (hard), and the balance with the dynamic friction coefficient between the outer films will be poor, making packaging difficult. The lower limit of the above range of water absorption per unit area is 350 g / m 2 It is preferable that the weight is 380 g / m or more. 2 The upper limit of the above range of water absorption per unit area is 550 g / m or more. 2 Preferably, it is 500 g / m or less. 2 More preferably, it is:

[0082] The water absorption per unit mass (g / g) of the paper towels 30a is preferably 6 g / g or more and 14 g / g or less. If the water absorption per unit mass is less than 6 g / g, the water absorption will be poor. On the other hand, if the water absorption per unit mass is greater than 14 g / g, the roll diameter DR of the paper towel roll 30 will be large, making packaging difficult. The lower limit of the above range of water absorption per unit mass is more preferably 8 g / g or more, and even more preferably 10 g / g or more. The upper limit of the above range of water absorption per unit mass is more preferably 13 g / g or less.

[0083] (Method for measuring water absorption) Next, a method for measuring the water absorption amount of each paper towel 30a will be described. Figure 6 is an explanatory diagram of a method for measuring the water absorption amount of a paper towel.

[0084] When measuring the water absorption of a two-ply paper towel 30a, first, two layers of paper towel 30a are taken and cut using a square template with each piece measuring 76 mm to prepare a rectangular test piece 200 (see FIG. 6) with each side measuring 76 mm. Next, the weight of test piece 200 before water absorption is measured using an electronic balance. Next, test piece 200 is set in holder 210 (see FIG. 6). Holder 210 is a jig that fixes three points of test piece 200 and is made of a metal that does not absorb water.

[0085] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 200 set in the holder 210 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 200 is removed from the distilled water together with the holder 210, and as shown in Fig. 6, the holder 210 and the test piece 200 are hung from a rod placed in an empty water tank with the specified corner 200a facing up, and the lid of the water tank is closed and left for 5 minutes.

[0086] Thereafter, the holder 210 and the test piece 200 are taken out of the water tank, the holder 210 is removed from the test piece 200, and the weight of the test piece 200 is measured using an electronic balance. Then, from the change in weight of the test piece 200 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 200 (g of water / sheet m 2 , 1m 2 Hit. Abbreviated as g / m 2 ) is calculated. Furthermore, the water absorption per unit area (g of water / sheet m 2 ) by the basis weight of the product ply of the test piece 200 to obtain the water absorption per unit area (water g / sheet m 2 ) / basis weight (sheet g / sheet m 2 ) = Water absorption per unit weight (g of water / g of sheet, per 1g. Abbreviated as g / g). Measurements are carried out five times for each sample, and the average value is used.

[0087] When the paper towel 30a has three plies, it is preferable to measure the three plies as is using the same procedure as for the two-ply product. The measurement is performed according to JIS P 8111 at a temperature of 23±1°C and a humidity of 50±2%. The distilled water is kept at 23±1°C.

[0088] (Embossed) Fig. 7 is a diagram showing an example of an embossing pattern. Fig. 8 is a diagram showing an example of a radial embossing and a closed-ring structure embossing of an embossing pattern. Fig. 9 is a diagram showing a height profile on an XY plane obtained by a microscope in shades of gray. Fig. 10 is a diagram showing a height profile on an XY plane obtained by a microscope in a graph. Fig. 11 is a diagram showing how to determine the embossing depth for an embossing pattern.

[0089] As shown in Figures 7 and 8, the paper towel 30a is embossed and preferably has an embossed pattern 60 in which two or more patterns are arranged at regular intervals. The embossed pattern 60 dramatically improves the aesthetic appeal of the paper towel 30a and the paper towel roll 30. The embossed pattern 60 is provided on at least one ply (the ply on the surface side of the paper towel 30a). By providing the embossed pattern 60 on the paper towel 30a, water absorption is improved. In addition, the amount of glue applied is optimized, making it difficult to peel, and the aesthetic appeal is improved. On the other hand, if the paper towel 30a does not have the embossed pattern 60, the aesthetic appeal is reduced, and it becomes difficult to adhere the plies. In addition, the water absorption is inferior.

[0090] As shown in FIGS. 7 and 8 , the embossed pattern 60 preferably includes radial embossments 61 and closed-ring embossments 62, and the radial embossments 61 and the closed-ring embossments 62 are alternately arranged at equal intervals. The inclusion of the radial embossments 61 dramatically improves the water diffusibility of the paper towel 30a, while the inclusion of the closed-ring embossments 62 dramatically improves the water retention of the paper towel 30a. Furthermore, the alternating arrangement of the radial embossments 61 and the closed-ring embossments 62 at equal intervals improves aesthetic appeal, optimizes the amount of glue applied, and optimizes peel strength. On the other hand, an embossed pattern that does not include at least one of the radial embossments 61 and the closed-ring embossments 62 reduces aesthetic appeal, impairs the amount of glue applied, and increases peel strength. It is desirable that the embossed pattern 60 is not parallel to either the MD or CD.

[0091] The lines forming the embossed pattern 60 may be solid, broken, dashed, or dotted, and may be of any thickness. Among these, solid lines are preferred because they provide good diffusion of absorbed moisture and good water retention.

[0092] (radial embossing) Although the overall shape of radial embossments 61 is not particularly limited, it is preferable that the embossed pattern 60 has a plurality of linear embossments extending from the center outward (in the direction away from the center) or a plurality of embossments in a shape made up of straight lines. When the embossed pattern 60 includes radial embossments 61, water diffuses along the embossments, improving the water diffusibility of the paper towel 30a.

[0093] (closed ring structure embossed) Like the radial embossments 61, the overall shape of the closed-ring structure embossments 62 is not particularly limited, but it is preferable that the closed-ring structure embossments include a linear or geometric embossment provided in the center and a geometric embossment that surrounds the central embossment to form a closed ring. When the embossment pattern 60 includes the closed-ring structure embossments 62, water is retained inside the embossments, improving the water retention of the paper towel 30a.

[0094] (embossed area ratio) The embossed area ratio of the paper towel 30a (hereinafter simply referred to as the "embossed area ratio") is preferably 4% or more and 30% or less. If the embossed area ratio of the paper towel 30a is less than 4%, the paper towel 30a will be tightly wound (soft), which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. On the other hand, if the embossed area ratio of the paper towel 30a is greater than 30%, the paper towel 30a will be tightly wound (hard), which will result in an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. The lower limit of the above-mentioned range of the embossed area ratio of the paper towel 30a is more preferably 6% or more, and even more preferably 8% or more. The upper limit of the above-mentioned range of the embossed area ratio of the paper towel 30a is more preferably 25% or less, and even more preferably 15% or less.

[0095] The embossed area ratio is determined by measuring the area of ​​the embossed depressions on the surface of the paper towel 30a with a ruler, tape measure, etc., or, if the embossing is difficult to see with the naked eye, with a microscope VR-3000 (manufactured by Keyence Corporation), and converting it into a ratio per unit area (area ratio).

[0096] The above area ratio is determined by measuring the total length of all embossments that are 0.1 mm to 4 mm thick and 5 mm or longer inside a rectangle E that includes one embossing pattern as shown in Figure 8, and then calculating the embossed area by multiplying the total length (mm) by the width (mm), and then calculating the embossed area by (embossed area / area of ​​rectangle E) x 100 (%). Note that if it is difficult to determine the embossed area ratio, the area ratio of the convex portions of the embossing roll used in embossing can be considered to be the area of ​​one sheet of paper towel 30a.

[0097] The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. Furthermore, if a rectangle that encompasses all of the embossed patterns includes an embossed pattern adjacent to an embossed pattern included in the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length. If the size of one side of rectangle E cannot be clearly determined depending on the embossed pattern, the size of rectangle E is set to 10 x 10 cm, and the total length of the embossments included in this rectangle E is measured. The total length is determined by measuring using a ruler, tape measure, etc. using the method described above. Furthermore, if it is difficult to visually inspect the embossing, it may be measured using a general microscope.

[0098] (embossing depth) In the embossing pattern 60, the depth of the embossments (hereinafter referred to as "embossing depth") is preferably 0.06 mm or more and 1.05 mm or less. If the embossing depth is less than 0.06 mm, when the roll density of the paper towel roll 30 is low, the roll becomes tighter (softer), which leads to an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. On the other hand, if the embossing depth is greater than 1.05 mm, when the roll density of the paper towel roll 30 is high, the roll becomes tighter (harder), which leads to an imbalance with the coefficient of dynamic friction between the outer film layers, making packaging difficult. The lower limit of the above-mentioned range of the embossing depth is more preferably 0.10 mm or more, and even more preferably 0.14 mm or more. The upper limit of the above-mentioned range of the embossing depth is more preferably 0.55 mm or less, and even more preferably 0.35 mm or less.

[0099] The embossing depth is measured using a microscope. The microscope used can be a Keyence One-Shot 3D Measuring Microscope VR-3100. The microscope image observation, measurement, and image analysis software can be the VR-H1A. The measurement conditions are a magnification of 25x and a field of view of 12mm x 9mm. The measurement magnification and field of view can be changed as needed depending on the desired size of the embossing.

[0100] Figure 9 shows a height profile on the XY plane taken with a microscope, with the height of the surface of the paper towel 30a represented by shading. Linear areas in Figure 9 that are different in shading from the surrounding area represent individual embossments. The depth of the embossments is determined by measuring the height difference of the embossments using the microscope.

[0101] The measurement is performed on the surface of the paper towels 30a (the radially outer surface of the paper towel roll 30). Furthermore, three wraps of paper towels 30a are removed from the paper towel roll 30, and the fourth wrap of paper towels 30a is used to measure the sheet (product ply state) without changing the number of plies. If there are perforations, these are avoided during the measurement.

[0102] First, a line segment AB is drawn as shown in Figure 9 to obtain the height profile shown in Figure 10. The line segment AB should be drawn so that it crosses the embossments. The line segment AB is drawn in the roll width direction (CD direction) of the paper towel 30a, but if the spacing between the embossments is narrow, for example, 2 mm or less, and the height of the convex portions described below becomes low, the line segment may be drawn diagonally or in the roll winding direction.

[0103] The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sample surface of the paper towel 30a. However, the (measured) cross-sectional curve S also contains noise (steep peaks due to fiber clumps, whisker-like fibers, or fiber-free areas on the surface of the paper towel 30a). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0104] Therefore, the (measured) profile curve S in Figure 10 is smoothed using the filter size of the weighted average radio button, ±12, to obtain the profile curve W in Figure 11. Note that smoothing using the filter of the weighted average radio button can be obtained automatically using the analysis software mentioned above. Then, in the graph shown in Figure 11, the average values ​​of the maximum values ​​on the vertical axis of the convex portion H1 and the convex portion H2 adjacent to the convex portion H1 are calculated, and the minimum value on the vertical axis of the concave portion D1 sandwiched between the convex portions H1 and H2 is found. The value obtained by subtracting the minimum value from the average value of the maximum values ​​found in this way is taken as the provisional emboss depth.

[0105] Furthermore, as shown in Figure 11, similar measurements are taken at two consecutive locations on the cross-sectional curve (the recess D1 and the recess D2 sandwiched between the protrusions H3 and H4) (two consecutive locations at this point). Then, the paper towel roll 30 is rotated three times by 90 degrees in the winding direction of the paper towel 30a, and similar measurements are taken at each position (four measurement locations in the winding direction). Finally, the average value of the eight locations (2 x 4) is used as the embossing depth.

[0106] (Uneven pattern derived from the papermaking process) 7, the paper towel 30a preferably has a concave-convex pattern 70 derived from the papermaking process, which is different from the embossed pattern 60. The presence of the concave-convex pattern 70 derived from the papermaking process improves water absorption. The method for providing the concave-convex pattern 70 derived from the papermaking process will be described later.

[0107] When the paper towel 30a is two-ply, there is no particular restriction as to whether the back surface of the paper towel 30a (the radially inner surface of the paper towel roll 30) has the embossed pattern 60, as long as it has a concavo-convex pattern 70 derived from the papermaking process that is different from the embossed pattern 60. Nested embossing or pin-to-pin embossing may be applied, or no embossing may be applied; however, nested embossing or no embossing is preferred, and no embossing is more preferred. When the paper towel 30a is three-ply, there are no restrictions as with two-ply, but it is preferred that the embossed pattern 60 be applied to the two front plies and the back surface be no embossing.

[0108] If the paper towel 30a has a concave-convex pattern 70 derived from a papermaking process different from the embossed pattern 60, there will be variations in the height of the convex portions on either side of the concave portion of the embossed pattern 60. For this reason, when measuring the embossing depth described above, if the difference in the vertical axis between the convex portions sandwiching the concave portion (for example, convex portions H3 and H4 sandwiching concave portion D2 shown in FIG. 11) is 0.2 mm or more, the measurement is performed at a location that avoids that portion.

[0109] (Relationship between winding hardness and coefficient of dynamic friction between outer film layers) The value A, which is expressed by the following formula (4) and indicates the relationship between the winding tightness and the coefficient of dynamic friction between the exterior films, is 6 or more and 30 or less. Value A = (winding tightness of paper towel roll 30 (mm)) / (coefficient of dynamic friction between outer film layers) (4) If the value A is smaller than 6, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will not slide easily, making packaging difficult. On the other hand, if the value A is larger than 30, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will slide too much, making packaging difficult. The lower limit of the above range for the value A is preferably 9 or more, and more preferably 12 or more. The upper limit of the above range for the value A is preferably 25 or less, and more preferably 21 or less.

[0110] (Relationship between roll mass (with core) and coefficient of dynamic friction between exterior films) The value B, which is expressed by the following formula (5) and shows the relationship between the roll mass (including the core) and the coefficient of dynamic friction between the exterior films, is preferably 35 or more and 90 or less. Value B = (roll mass <with core> (g)) × (coefficient of dynamic friction between outer films) (5) If the value B is smaller than 35, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will slide too much, making packaging difficult. On the other hand, if the value B is larger than 90, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will not slide as well, making packaging difficult. The lower limit of the above range for the value B is more preferably 40 or more, and even more preferably 45 or more. The upper limit of the above range for the value B is more preferably 79 or less, and even more preferably 75 or less.

[0111] (Relationship between roll density and coefficient of dynamic friction between exterior films) The value C, which is expressed by the following formula (6) and shows the relationship between the roll density and the coefficient of dynamic friction between the exterior films, is preferably 0.007 or more and 0.020 or less. Value C = (roll density (g / cm 3 )) × (coefficient of dynamic friction between exterior films) (6) If the value C is smaller than 0.007, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will be too slippery, making packaging difficult. On the other hand, if the value C is larger than 0.020, the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 will not slide easily, making packaging difficult. The lower limit of the above range for the value C is more preferably 0.009 or more, and even more preferably 0.011 or more. The upper limit of the above range for the value C is more preferably 0.018 or less, and even more preferably 0.015 or less.

[0112] <Manufacturing method for paper towel rolls> FIG. 12 is a diagram showing a part of the paper towel roll manufacturing process.

[0113] The paper towel roll 30 can be manufactured, for example, through the following steps: papermaking and creping, embossing and bonding, and then winding into a roll.

[0114] In the papermaking process, raw pulp is blended in a predetermined ratio and paper-made in a papermaking machine to obtain a one-ply raw sheet. In the papermaking process for paper towel 30a, drying is preferably performed using a through-air drying (TAD) papermaking technique. In this papermaking process, it is preferable that a concave-convex pattern 70 derived from the papermaking process (fabric), different from the above-mentioned embossed pattern 60, is applied to paper towel 30a. By having this concave-convex pattern 70, the water absorption capacity of paper towel 30a can be further increased.

[0115] As shown in FIG. 12, for example, a papermaking machine 80 used in a papermaking process includes two fabrics 81 and 82, a forming roll 83, at least one (two in FIG. 12) through-air dryer 84, a Yankee dryer 85, and a headbox 86.

[0116] The first fabric 81 is, for example, a TAD fabric having concaves and convexes, and is provided so as to loop around a forming roll 83 and a plurality of guide rolls 87a, and rotates in a predetermined direction. The forming roll 83 is disposed upstream in the flow direction of a paper web (wet paper) 88b. The second fabric 82 is, for example, a forming wire (papermaking net), and is provided so as to loop around a plurality of guide rolls 87b, and rotates in a predetermined direction. The second fabric 82 is disposed so as to face the first fabric 81 that runs along the forming roll 83.

[0117] The head box 86 injects (supplies) pulp slurry 88a between the first fabric 81 along the forming roll 83 and the opposing second fabric 82. The pulp slurry 88a from the head box 86 is sandwiched between the first fabric 81 and the second fabric 82 by the forming roll 83, and becomes a paper web (wet paper) 88b.

[0118] The first fabric 81 passes through a through-air dryer 84 downstream of the forming roll 83. The paper web 88b that has passed through the forming roll 83 is separated from the second fabric 82 before the through-air dryer 84 and passes through the through-air dryer 84 together with the first fabric 81. The through-air dryer 84 removes water from the paper web 88b to dry it. One or two through-air dryers 84 may be provided.

[0119] The Yankee dryer 85 is disposed downstream of the through-air dryer 84. The paper web 88b that has passed through the through-air dryer 84 is separated from the first fabric 81 and transported along the drum of the Yankee dryer 85. The Yankee dryer 85 performs final drying of the paper web 88b. Although a Yankee hood is shown on the Yankee dryer 85 in FIG. 12, the hood may be omitted. Creping may be performed in the Yankee dryer 85. Furthermore, when drying the paper web 88b, it is preferable that the rate of change in the moisture content of the paper web 88b before and after the through-air dryer 84 is greater than the moisture content before and after the Yankee dryer 85.

[0120] "Derived from the papermaking process" means that the uneven pattern is imparted between the head box 86 of the papermaking machine 80 and the outlet of the Yankee dryer 85 during the papermaking process of the paper towel 30a. In particular, the uneven pattern is formed by drying the paper web 88b together with the first fabric 81 in the through-air dryer 84. Specifically, the uneven pattern 70 is imparted by the first fabric 81, which has unevenness, during a part of the papermaking process shown in FIG. 12. The uneven pattern 70 can be changed as needed by changing the pattern (fine pattern, coarse pattern) of the first fabric 81. Changing the uneven pattern 70 changes the specific volume (paper thickness), but it is preferable to select a pattern that ensures that the specific volume of the sheet in a rolled state falls within the above-mentioned numerical range.

[0121] In the embossing and gluing process, the sheets are embossed and then laminated to form multiple plies (for example, two plies). When laminating multiple plies, glue containing polyvinyl alcohol (PVOH) or carboxymethyl cellulose (CMC) is applied to the sheets for gluing.

[0122] The paper towel package 10 configured as described above is a paper towel package 20 in which 2 to 6 rolls of paper towel rolls 30 are packaged together in a first exterior film 40, and 2 to 8 rolls of paper towel packages 20 are packaged together in a second exterior film 50. The paper towel roll 30 is a roll of paper towels 30a, each of which is made by laminating sheets in two or three plies, wound into a roll. The water absorption per unit area of ​​the paper towels 30a is 300 g / m 2 More than 600g / m 2 The roll diameter DR of the paper towel roll 30 is 127 mm or more and 180 mm or less, the roll mass including the core 31 per 280 mm width of the paper towel roll 30 is 230 g or more and 555 g or less, the coefficient of dynamic friction between the outer surface of the first exterior film 40 and the inner surface of the second exterior film 50 is 0.12 or more and 0.24 or less, and the value represented by the above formula (4) is 6 or more and 30 or less.

[0123] Therefore, according to this embodiment, a paper towel package 10 can be provided that can stably package a paper towel roll 30, which is made by rolling up paper (paper towel 30a) with excellent water absorption properties, in two outer packaging films (first outer packaging film 40 and second outer packaging film 50).

[0124] Although the present invention has been described above based on the above embodiment, the present invention is not limited to the content of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Example]

[0125] The present embodiment will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0126] (Examples 1 to 24 and Comparative Examples 1 to 9) Paper towel package packages were manufactured for each of Examples 1 to 24 and Comparative Examples 1 to 9 shown in Tables 1 to 3. When manufacturing the paper towel package packages, first, a paper towel roll was manufactured through the above-mentioned processes of TAD papermaking and creping, embossing and adhesive treatment, and roll winding. Next, a plurality of the manufactured paper towel rolls were packaged together in a first exterior film to form a paper towel package. Finally, a plurality of the paper towel packages were packaged together in a second exterior film to form a paper towel package. In Examples 1 to 24 and Comparative Examples 1 to 9, the paper towel roll was a kitchen towel roll.

[0127] Each paper towel package was then measured or evaluated for the following two items ("absorbency of paper towels" and "ease of packaging"). Each parameter was measured according to the standards or measurement methods described above.

[0128] (Paper towel absorbency) The "water absorbency of paper towels" was evaluated by measuring the amount of water absorbed per unit area of ​​the paper towels, and based on the measurement results, evaluation was made according to the following criteria. ◎: Water absorption per unit area is 380g / m 2 End ○: Water absorption per unit area is 350g / m 2 More than 380g / m 2 less than △: Water absorption per unit area is 300g / m 2 More than 350g / m 2 less than ×: Water absorption per unit area is 300g / m 2 less than

[0129] (Ease of packaging) For the evaluation of "ease of packaging," paper towel packages were packaged in a first outer film, and 2 to 8 of these were then packaged together in a second outer film. After packaging, the packages were classified into "good" and "defective" products, and the proportion of "defective" products was calculated and evaluated according to the following criteria. ◎: The rate of defective products was less than 1%. ○: The rate of defective products was 1% or more and less than 2%. △: The rate of defective products was 2% or more but less than 3%. ×: The rate of defective products was 3% or more.

[0130] The results obtained are shown in Tables 1 to 3. In Tables 1 to 3, paper towels are referred to as "sheets" and paper towel rolls are referred to as "rolls."

[0131] [Table 1]

[0132] [Table 2]

[0133] [Table 3]

[0134] As can be seen from Tables 1 to 3, the present disclosure can provide a paper towel wrapper package that can stably package a paper towel roll made of highly absorbent paper (paper towel) wound into a roll shape when double-wrapped with two outer films. [Explanation of symbols]

[0135] 10:Paper towel packaging 20:Paper towel packaging 30: Paper towel roll 30a: Paper towels 40: First exterior film 50: Second exterior film 60: Embossed pattern 70: Concave and convex pattern

Claims

1. A paper towel package package in which 2 to 6 paper towel rolls are packaged together in a first outer film, and 2 to 8 paper towel packages are packaged together in a second outer film, The paper towel roll is a paper towel roll formed by stacking sheets in two or three plies and winding the sheet into a roll. The water absorption capacity of the paper towel per unit area is 300 g / m ２ More than 600g / m ２ is as follows: The roll diameter of the paper towel roll is 127 mm or more and 180 mm or less, The roll weight including the core per 280 mm width of the paper towel roll is 230 g or more and 555 g or less, a dynamic friction coefficient between an outer surface of the first exterior film and an inner surface of the second exterior film is 0.12 or more and 0.24 or less; The value represented by the following formula (1) is 6 or more and 30 or less. A paper towel package characterized by: (the winding tightness of the paper towel roll) / (the dynamic friction coefficient) (1)

2. The basis weight of the paper towel is 30 g / m ２ 56g / m or more ２ is 2. The paper towel wrapper package of claim 1.

3. The value represented by the following formula (2) is 35 or more and 90 or less.

3. The paper towel package of claim 1 or claim 2. (the roll mass) × (the dynamic friction coefficient) (2)

4. The roll density of the paper towel roll is 0.04 g / cm ３ 0.13g / cm or more ３ is 3. The paper towel package of claim 1 or claim 2.

5. The value represented by the following formula (3) is 0.007 or more and 0.020 or less.

3. The paper towel package of claim 1 or claim 2. (roll density of the paper towel roll) × (coefficient of dynamic friction) (3)

6. The paper towel roll has a winding hardness of 1.0 mm or more and 5.0 mm or less.

3. The paper towel package of claim 1 or claim 2.

7. The percentage of the actual circumference of the first exterior film to the theoretical circumference calculated from the winding diameter of the paper towel roll ((actual circumference / theoretical circumference)×100(%)) is 94% or more and 102% or less.

3. The paper towel package of claim 1 or claim 2.

8. The paper towel package is wrapped in a caramel wrapper by the first outer film.

3. The paper towel package of claim 1 or claim 2.

9. The paper towel has a concave-convex pattern derived from the papermaking process, which is different from the embossed pattern.

3. The paper towel package of claim 1 or claim 2.

10. The specific volume of the paper towel is 7 cm ３ / g or more 23cm ３ / g or less 3. The paper towel package of claim 1 or claim 2.

11. The roll length of the paper towel roll is 18 m or more and 45 m or less.

3. The paper towel package of claim 1 or claim 2.

12. The thickness of the first exterior film is 18 μm or more and 52 μm or less.

3. The paper towel package of claim 1 or claim 2.

13. The thickness of the second exterior film is 28 μm or more and 65 μm or less.

3. The paper towel package of claim 1 or claim 2.

Images