Paper Towel Roll

Abstract

To provide a paper towel roll obtained by winding a paper towel having a high basis weight and a high absorbent property, which satisfies the difficulty in peeling off a tail seal part 3 during manufacturing, the ease of peeling off the tail seal part 3 during use, and a low sticky feeling when wet with water, and has a good holding property.SOLUTION: There is provided a paper towel roll 1 that is obtained by winding a 1-ply sheet mainly composed of pulp fibers and containing synthetic fibers into a roll, and has a tail seal part 3 made by gluing a tail part 4 of a paper towel sheet 1x and an outermost surface of the paper towel roll 1 with a glue. The paper towel roll is configured in that: the paper towel sheet 1x has a basis weight of 40 g / m2 or more and 150 g / m2 or less, and a water absorption of 210 g / m2 or more and 520 g / m2 or less; an amount of a glue applied is 0.5 g or more and 5 g or less; and the paper towel roll 1 has a roll density of 0.05 g / cm3 or more and 0.19 g / cm3 or less, and a winding diameter of 75 mm or more and 160 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to paper towel rolls. [Background technology]

[0002] Paper towels have a variety of uses, such as cleaning up oil stains around the kitchen, wiping with water, and draining food. Therefore, paper towels are required to have excellent absorbency for water and oil, and to be strong enough to withstand continuous use without easily tearing when used for cleaning purposes. Various proposals have been made to solve the above problems.

[0003] Patent document 1 describes a method for manufacturing a kitchen paper roll, in which a two-ply strip of kitchen paper is wound into a roll and the tail portion, which is the end of the roll, is adhered to the outermost surface of the roll with a specified adhesive to create a tail seal (Claim 1). The predetermined adhesive paste contains a first adhesive and a second adhesive, the first adhesive being a water-soluble adhesive containing a cellulose-based, starch-based, acrylic resin-based or a mixture thereof and having a viscosity of 5 to 200 mPa·s at 30° C., and the second adhesive being a water-soluble adhesive containing a polyethylene oxide-based, polyethylene glycol-based or a mixture thereof and having a viscosity of 2000 to 3000 mPa·s at 30° C. Patent Document 1 describes that this prevents poor adhesion of the tail seal when producing kitchen paper rolls, improves the yield during production of kitchen paper rolls, and, secondarily, improves the water absorbency of kitchen paper that can be used for kitchen paper rolls (paragraph 0018).

[0004] Patent Document 2 describes a method for manufacturing a kitchen paper roll, in which a two-ply belt-shaped kitchen paper roll is wound into a roll and the tail portion, which is the end of the roll, is adhered to the outermost peripheral surface of the obtained roll with a specified adhesive paste to perform tail sealing (Claim 1). The specified adhesive paste contains a first adhesive and a second adhesive, the first adhesive being a mixture of a water-soluble adhesive containing a cellulose-based, starch-based, acrylic resin-based or mixture thereof and having a viscosity of 5 to 200 mPa·s at 30°C and a polyvinyl alcohol-based water-soluble adhesive having a viscosity of 10,000 to 20,000 mPa·s at 30°C, and the second adhesive being a water-soluble adhesive containing a polyethylene oxide-based, polyethylene glycol-based or mixture thereof and having a viscosity of 2,000 to 3,000 mPa·s at 30°C. Patent document 2 describes that poor adhesion of the tail seal during the production of kitchen paper rolls can be prevented, the yield during the production of kitchen paper rolls can be improved, and, as a secondary effect, the water absorbency of the kitchen paper that can be used for the kitchen paper rolls can be improved.

[0005] Patent Document 3 describes a paper roll in which a seal part is formed by applying a seal paste to at least a part of the tail part or the beginning of winding, the seal paste contains cellulose nanofiber, and the tail part or the beginning of winding where the seal part is formed has a dry peel strength of 60 to 300 cN as determined by a 180-degree peel test using a Tensilon universal testing machine (Claim 1). According to Patent Document 3, it is possible to provide a paper roll in which the seal part, in which the seal paste is applied to the paper, has both good adhesive strength and ease of peeling.

[0006] Patent Document 4 describes a nonwoven fabric wiper obtained by hydroentangling a pulp fiber web and a synthetic fiber web, in which the average fiber length of the pulp fibers contained in the pulp fiber web is 1.0 to 5.0 mm, and the basis weight of the nonwoven fabric wiper is 20 to 42 g / m 2The nonwoven fabric wiper has a composition ratio of 70 to 50 mass % of a pulp fiber web and 30 to 50 mass % of a synthetic fiber web (Claim 1). According to Patent Document 4, a nonwoven fabric wiper is provided which is easy to use, has a good texture, is well balanced with strength, and is also excellent in terms of production cost. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6077795 [Patent Document 2] Patent No. 6077796 [Patent Document 3] Patent Publication No. 2021-87615 [Patent Document 4] JP 2018-193634 A Summary of the Invention [Problem to be solved by the invention]

[0008] Paper towels that contain synthetic fibers and have a high basis weight and excellent water absorption differ from ordinary paper towels in that it is difficult to freely adjust the amount and composition of the glue used to seal the tail of the paper towel roll.

[0009] For example, it is preferable to apply a small amount of glue to a typical paper towel, but in the case of a paper towel with excellent water absorption, if the amount of glue applied is too small, the paper towel sheet absorbs the glue, making it difficult to adhere at the tail portion, and the tail seal is easily peeled off when the paper towel roll is cut with a log saw or wrapped in film. Conversely, if the amount of glue applied is too large, the glue melts when the paper towel is wetted with water during use, giving it a sticky feel and making it less easy to use. In addition, if the area (application width) of glue application is too small, the tail seal is easily peeled off, and conversely, if the application area is too large, the paper towel is difficult to peel off when used, making it less easy to use when wet.

[0010] In addition, in the case of general paper towels, if the basis weight is too high, the sheet absorbs glue and the tail seal becomes easily peeled off, and this tendency is more pronounced in paper towels with excellent water absorption. Conversely, if the basis weight is reduced to prevent the sheet from absorbing glue, the water absorption becomes poor. In addition, when synthetic fibers are included, the water absorption becomes significantly poor because synthetic fibers do not absorb water.

[0011] Furthermore, if the tail portion of the paper towel roll is too long, when the roll is laid down after winding, a large load is applied to the outside of the tail portion, making the tail seal more likely to peel off. Conversely, if the tail portion is too short, the paper towel will be difficult to peel off when in use, making it less user-friendly.

[0012] For the reasons described above, with conventional paper towels containing synthetic fibers that have a high basis weight and excellent absorbency, it was difficult to achieve a balance between the amount of glue applied, the length of the tail portion, the resistance of the tail seal to peeling off during manufacturing, and the ease of peeling off the tail seal during use.

[0013] To provide a paper towel roll having a high basis weight and highly absorbent paper towel wound thereon, which achieves both resistance to peeling of the glue part tail seal portion during manufacture, ease of peeling of the glue part tail seal portion during use, and little stickiness when wet, and is easy to hold. [Means for solving the problem]

[0014] As a result of intensive research aimed at solving the above problems, the inventors have discovered that when a paper towel sheet containing synthetic fibers and having a high basis weight and high water absorption capacity within a predetermined range is wound into a roll, a paper towel roll having desired properties can be obtained, and have completed the present invention. The present invention provides the following paper towel roll.

[0015] (1) A paper towel roll made by winding up a one-ply sheet containing mainly pulp fibers and synthetic fibers into a roll. A tail seal portion is provided by gluing the tail portion of the paper towel sheet to the outermost peripheral surface of the paper towel roll, The paper towel sheet has a basis weight of 40 g / m 2 More than 150g / m 2 below, Water absorption capacity: 210g / m 2 More than 520g / m 2 is as follows: The amount of glue applied is 0.5 g or more and 5 g or less, The paper towel roll has a roll density of 0.05 g / cm 3 More than 0.19g / cm 3 The following refers to paper towel rolls with a roll diameter of 75 mm or more and 160 mm or less. (2) The paper towel roll of (1) above, wherein the glue application width is 2 mm or more and 30 mm or less. (3) The paper towel roll according to (1) or (2) above, wherein the length of the tail portion is 4 mm or more and 45 mm or less. (4) The paper towel roll according to any one of (1) to (3) above, wherein the thickness of the paper towel is 200 μm or more and 1400 μm or less. (5) A paper towel roll according to any one of (1) to (4) above, wherein the peel strength of the glue is 0.6 N / 76 mm or more and 8 N / 76 mm or less. (6) The paper towel roll according to any one of (1) to (5) above, wherein the paper towel sheet has an embossed surface, and the depth of the embossed surface is 0.07 mm or more and 1.8 mm or less. (7) A paper towel roll according to any one of (1) to (6) above, wherein the bending stiffness in the MD direction of the paper towel sheet is 10 μN·m or more and 130 μN·m or less. (8) The paper towel roll according to any one of (1) to (7) above, wherein the DMDT of the paper towel sheet is 8 N / 25 mm or more and 75 N / 25 mm or less, and the DCDT is 2 N / 25 mm or more and 50 N / 25 mm or less. (9) A paper towel roll according to any one of (1) to (8) above, wherein the proportion of the synthetic fibers in the paper towel sheet relative to the total basis weight is 5% by weight or more and 50% by weight or less, and the proportion of the pulp fibers is 50% by weight or more and 95% by weight or less. (10) The synthetic fiber has a basis weight of 4 g / m 2 More than 40g / m 2 Hereinafter, the basis weight of the pulp fiber is 33 g / m 2 More than 120g / m 2 The paper towel roll (9) above, which is as follows: Effect of the Invention

[0016] According to the present invention, there is provided a paper towel roll having a high basis weight and highly absorbent paper towel sheet wound thereon, which achieves both a tail seal that is difficult to peel off during manufacturing, a tail seal that is easy to peel off during use, and little sticky feeling when wet, and which is easy to hold. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a schematic appearance of a paper towel roll according to an embodiment of the present invention. [Diagram 2] 2 is a schematic perspective view showing the state in which the tail seal of the paper towel roll in FIG. 1 has been peeled off and the end portion has been pulled out. [Diagram 3] FIG. 1 is a diagram showing a height profile on an XY plane taken by a microscope using shading. [Figure 4] FIG. 1 is a graph showing a height profile on an XY plane obtained by a microscope. [Diagram 5] FIG. 13 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 6] FIG. 2 is a diagram showing a method for measuring the water absorption of the paper towel roll of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Fig. 1 is a perspective view of a paper towel roll 1 according to this embodiment. Fig. 2 is a perspective view showing the state in which tail portion 3 of paper towel roll 1 in Fig. 1 has been peeled off and the end portion has been pulled out. As shown in Fig. 2, of the surfaces of paper towel sheet 1x, the surface facing the outside of the roll is sometimes referred to as surface 1a (surface of paper towel sheet 1x), and the surface facing the center of the roll is sometimes referred to as back surface 1b (back surface of paper towel sheet 1x).

[0019] As shown in Figs. 1 and 2, the paper towel roll 1 according to this embodiment is formed by winding up a paper towel sheet 1x having an embossed pattern into a roll, and applying a glue portion 2 (hereinafter also referred to as "tail seal glue 2") along the roll width direction W (roll axial direction) to the end of the roll in the roll winding direction R for adhesion treatment. The paper towel sheet 1x is preferably perforated in the roll width direction W at approximately equal intervals in the roll winding direction R. The core (center portion, hollow portion in this embodiment) of the paper towel roll 1 can be, for example, a cylinder made of paper or plastic, but a paper core is preferred from the viewpoint of ease of disposal after use. Also, the core need not be used.

[0020] Examples of paper towel rolls 1 include rolls (kitchen paper rolls) of kitchen paper (sometimes called paper towel or cooking paper) used for wiping off moisture or oil and removing dirt in home kitchens and restaurant kitchens, and other rolls of sanitary paper. In all of these rolls, a tail portion 3 is formed by applying a glue portion 2 along the roll width direction W to the inside of the end portion of the roll in the roll winding direction R (i.e., the outermost edge 1c in the roll winding direction R or its vicinity) during production of the roll.

[0021] (Tail seal) The tail seal portion 3 of the paper towel roll 1 adheres the back surface 1b of the paper towel sheet 1x at the end of the roll to the front surface 1a of the paper towel sheet 1x on the radially inner side to prevent the end of the roll in the roll winding direction R of the paper towel roll 1 from rolling up. The tail seal portion 3 is formed by applying tail seal glue 2 along the roll width direction W at the end of the roll in the roll winding direction R of the paper towel roll 1. For example, the tail seal portion 3 can be formed by applying tail seal glue 2 to the front surface 1a or back surface 1b of the paper towel sheet 1x. In this case, the tail seal glue 2 can be applied to the front surface 1a of the paper towel sheet 1x on the radially inner side facing the end of the roll of the paper towel roll 1, and the end of the roll of the paper towel roll 1 can be adhered to the paper towel sheet 1x on the radially inner side. Alternatively, the tail seal glue 2 can be applied to the back surface 1b of the paper towel sheet 1x at the end of the paper towel roll 1 to bond the end of the paper towel roll 1 to the paper towel sheet 1x on the radially inner side, but it is preferable to apply the tail seal glue 2 to the back surface 1b of the paper towel sheet 1x. Note that in this embodiment, the tail seal glue 2 is applied continuously in a straight line along the roll width direction W, but this is not limited to this, and for example, the tail seal glue 2 may be applied at a predetermined distance apart in the roll width direction W.

[0022] (Glue composition) The glue (glue portion 2) that bonds the end portion of the paper towel roll 1 in the roll winding direction R can be any known material, but it is preferable to use one or more types selected from the group consisting of starch, polyvinyl alcohol, and carboxymethyl cellulose, and polyvinyl alcohol is more preferable. By using glue with the above composition, it is possible to obtain a paper towel roll 1 in which the tail seal portion 3 is difficult to peel off during production, as in this embodiment, and which is easy to peel off during use.

[0023] (Glue application position) The tail seal glue 2 is applied to a position (application position) spaced a predetermined length L1 from the outermost edge 1c in the roll winding direction R of the paper towel roll 1 toward the base end in the roll winding direction R. That is, an area (tail seal portion 3) that is not adhered to the paper towel roll 1 on the radially inner side is provided on the end side of the roll winding direction R from the application point of the glue portion 2 (tail seal portion 3) of the paper towel sheet 1x. The length L1 (the above-mentioned predetermined length L1) of the tail portion 4 of the paper towel sheet 1x on the end side of the roll winding direction R from the glue application point of the glue portion 2 is preferably 4 mm or more and 45 mm or less, more preferably 8 mm or more and 35 mm or less, and even more preferably 12 mm or more and 28 mm or less. If the length L1 of the tail portion 4 of the paper towel sheet 1x is less than 4 mm, it becomes difficult to peel off the tail seal portion 3 when using the paper towel sheet 1x, resulting in poor usability. Furthermore, if the length L1 of tail portion 4 of paper towel sheet 1x exceeds 45 mm, the tail portion 4 that peels off from paper towel roll 1 will be too long, and the tail seal portion 3 will be prone to peeling off due to the weight of tail portion 4 or getting caught on tail portion 4 when cutting with a log saw or wrapping with film in manufacturing paper towel roll 1 (hereinafter simply referred to as "when manufacturing paper towel roll 1"). Note that length L1 of tail portion 4 of paper towel sheet 1x is measured at a total of three points, the center in the roll width direction W and positions 10% from both ends of the roll width, and the average value is taken.

[0024] (Glue application width) The application width L2 of the glue portion 2 according to this embodiment (the length of the tail seal portion 3 in the roll winding direction R) is not particularly limited, but from the viewpoint of both adhesive strength and ease of peeling, it is preferably 2 mm or more and 30 mm or less, more preferably 5 mm or more and 20 mm or less, and even more preferably 7 mm or more and 13 mm or less. This application width L2 refers to the length of the glue portion 2 in the roll winding direction R. In this case, the length is measured at a total of three points, including the center of the roll width direction W and positions 10% from both ends of the roll width, and the average value is taken as the length. If the application width L2 of the glue portion 2 is less than 2 mm, the tail seal portion 3 is easily peeled off during the manufacture of the paper towel roll 1. In addition, if the application width L2 of the glue portion 2 exceeds 30 mm, the glue portion 2 melts when the paper towel sheet 1x is wetted with water during use, resulting in a sticky feeling and poor usability.

[0025] (Amount of glue applied) The amount of glue portion 2 applied per roll is preferably 0.5 g to 5 g, more preferably 1 g to 3.8 g, and even more preferably 1.5 g to 2.5 g. If the amount of glue portion 2 applied per roll is less than 0.5 g, the tail seal portion 3 is likely to peel off during the manufacture of the paper towel roll 1. If the amount of glue portion 2 applied per roll exceeds 5 g, the glue portion 2 melts when the paper towel sheet 1x is wetted with water during use, resulting in a sticky feel and poor usability. The amount of glue portion 2 applied per roll refers to the amount of glue used per roll (per width of one roll).

[0026] The amount of glue applied to the glue portion 2 is measured by the following method. First, all sheets (paper towel sheets 1x) including areas where tail seal glue 2 is applied are sampled from a sample of paper towel roll 1. At this time, in addition to the sheets on the outer periphery, several revolutions of the sheets on the inner roll are also sampled. Next, the same number of sheets with the same area as the sheets sampled above are sampled from areas where tail seal glue 2 is not applied. Next, the weight of each sampled sheet is measured, and the amount of tail seal glue 2 applied per roll is calculated using the following formula. Amount of tail seal glue 2 applied per roll = (total weight of sheet where tail seal glue 2 is applied) - (total weight of sheet where tail seal glue 2 is not applied)

[0027] (Glue peel strength) The peel strength of the adhesive portion (tail seal portion 3) of the paper towel sheet 1x by the glue portion 2 is preferably 0.6 N / 76 mm or more and 8 N / 76 mm or less, more preferably 1.0 N / 76 mm or more and 6 N / 76 mm or less, and even more preferably 1.4 N / 76 mm or more and 3.9 N / 76 mm or less. If the peel strength of the tail seal portion 3 is less than 0.6 N / 76 mm, the tail seal portion 3 tends to peel off easily during the manufacture of the paper towel roll 1. If the peel strength of the tail seal portion 3 exceeds 8 N / 76 mm, the tail seal portion 3 becomes difficult to peel off when using the paper towel sheet 1x, and the ease of use tends to be reduced.

[0028] The tail seal peel strength can be measured using a tensile tester (STB-1225S, manufactured by A&D Co., Ltd.) in accordance with the tensile test method of JIS P 8113, and is performed under the standard conditions specified in JIS P 8111. The tail seal peel strength is measured by the following method. First, two test pieces of one set of two-ply sheets with ends bonded with tail seal glue 2 and a width of 76 mm and a roll winding direction R of 100 mm are taken from a paper towel roll sample. At this time, the part not bonded with tail seal glue 2 for each of the two test pieces of one set of two-ply sheets is made to be 70 mm or more in length. If the part not bonded with tail seal glue 2 cannot be taken for 70 mm in length due to perforations, etc., it can be shortened to the extent that does not include the perforations. In that case, the pitch of the gripping tool described later is also shortened accordingly.

[0029] Next, the 20 mm end portion not bonded by the tail seal glue 2 is clamped and fixed by the upper and lower grippers. The pitch (spacing) of the grippers is 100 mm. Next, the material is pulled at a pulling speed of 100 mm / min until it is completely peeled off, and the maximum value at that time is the peel strength of the tail seal (N / 76 mm).

[0030] (Roll length and diameter) The winding length of the paper towel roll 1 is not particularly limited, but is preferably 7 m to 24 m, more preferably 10 m to 22 m, and even more preferably 13 m to 18 m. If the winding length is less than 7 m, the winding diameter DR becomes too small, the curvature becomes large, and the rebound of the paper towel sheet 1x becomes large, so that the tail portion 3 tends to peel off easily. If the winding length exceeds 24 m, the winding diameter DR becomes too large, making it difficult to hold the paper towel roll 1 by hand, and the ease of use as a roll product tends to be poor.

[0031] To determine the roll length, measure the length of 10 sheets of paper towel sheets 1x between the perforations of paper towel roll 1. Then, measure the number of sheets in paper towel roll 1, and calculate the roll length proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80 m and there are 150 sheets, then the roll length is 1.80 m x (150 / 10) = 27 m. If paper towel roll 1 does not have perforations, measure the roll length.

[0032] The winding diameter DR of the paper towel roll 1 according to this embodiment is preferably 75 mm to 160 mm, more preferably 100 mm to 140 mm, and even more preferably 108 mm to 130 mm. If the winding diameter DR is less than 75 mm, the curvature becomes large and the resilience of the paper towel sheet 1x becomes large, so that the tail portion 3 is easily peeled off. If the winding diameter DR exceeds 160 mm, the paper towel roll 1 becomes difficult to hold by hand, and the ease of use as a roll product is inferior.

[0033] The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Ten paper towel rolls 1 are measured, and the measurement results are averaged.

[0034] (Roll width and roll weight) The roll width of the paper towel roll 1 is not particularly limited, but is preferably 180 mm to 350 mm, more preferably 210 mm to 325 mm, and even more preferably 240 mm to 300 mm. By setting the roll width within this range, it is possible to provide a paper towel roll 1 having good water absorbency and excellent ease of holding, as in the present embodiment.

[0035] The roll mass of the paper towel roll 1 is not particularly limited, but is preferably 140 g to 600 g, more preferably 220 g to 450 g, and even more preferably 250 g to 400 g. By setting the roll mass within this range, when using a paper towel roll sheet 1x with good water absorption as in this embodiment, the roll diameter does not become too large and the paper towel roll 1 is easy to hold. The roll mass is the mass per 280 mm of roll width not including the core (paper tube). If the roll width is not 280 mm, it is converted to the mass per 280 mm by proportional calculation.

[0036] (Roll density) The roll density of the paper towel roll 1 according to this embodiment is preferably 0.05 g / cm 3 More than 0.19g / cm 3 Less than or equal to 0.07 g / cm 3 More than 0.17g / cm 3 More preferably, 0.09 g / cm 3 More than 0.15g / cm 3 The roll density of paper towel roll 1 is 0.05 g / cm 3 If the roll density of the paper towel roll 1 is less than 0.19 g / cm, the pressure applied when the paper towel roll 1 is wound is weak, so that the adhesion of the glue portion 2 is weak and the tail seal portion 3 is easily peeled off during the manufacture of the paper towel roll 1. 3If it exceeds this value, the water absorbency will be poor, and because the pressure applied when winding up the paper towel roll 1 will be strong, the adhesion of the glue portion 2 will be too strong, making it difficult to peel off the tail seal portion 3 when using the paper towel sheet 1x.

[0037] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of paper towel roll 1 per 280 mm of roll width. Roll volume is expressed as [{cross-sectional area of ​​roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​core (paper tube) outer diameter DI)] × roll width (converted per 280 mm). For example, if the roll mass (excluding core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the core outer diameter DI is 39 mm, roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(280mm÷10)]=0.08g / cm 3 If paper towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI.

[0038] (winding density) The winding density of the paper towel roll 1 according to this embodiment is not particularly limited, but is preferably 0.08 m / cm 2 More than 0.32m / cm 2 Less than or equal to 0.10 m / cm, more preferably 0.10 m / cm 2 More than 0.28m / cm 2 Less than 0.12 m / cm, more preferably 0.12 m / cm 2 More than 0.24m / cm 2 The winding density of paper towel roll 1 is 0.08 m / cm 2 If the winding density of the paper towel roll 1 is less than 0.32 m / cm, the pressure applied when the paper towel roll 1 is wound is weak, so that the adhesion of the glue portion 2 is weak, and the tail seal portion 3 tends to peel off easily during the manufacture of the paper towel roll 1. 2If the thickness exceeds this value, the absorbency will be poor, and because the pressure applied when winding up the paper towel roll 1 will be too strong, the adhesion of the glue portion 2 will become too strong, and it will tend to be difficult to peel off the tail seal portion 3 when using the paper towel sheet 1x.

[0039] The winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll's outer diameter (winding diameter DR) - (cross-sectional area of ​​the core (paper tube) outer diameter DI)}. For example, in the case of a winding length of 27 m, 2 plies, winding diameter DR of 150 mm, and core outer diameter DI of 39 mm, the winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}=0.33m / cm 2 If paper towel roll 1 does not have a core, the diameter of the central hole is taken as the core outer diameter DI.

[0040] (Core outer diameter) The core outer diameter DI, which is the outer diameter of the core of the paper towel roll 1 according to this embodiment, is not particularly limited, but is preferably 25 mm or more and 55 mm or less, more preferably 30 mm or more and 50 mm or less, and even more preferably 35 mm or more and 45 mm or less. By having the core outer diameter DI within the above range, the roll product can be made easy to hold while maintaining the winding diameter and winding density of the paper towel roll 1 in a suitable manner. The core outer diameter is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring the core outer diameter DI of 10 paper towel rolls 1, and the average value of the obtained calculated values ​​is calculated. In addition, the mass of the core (paper tube) per roll width of 280 mm is not particularly limited, but is preferably 5 g or more and 22 g or less, more preferably 7 g or more and 17 g or less, and even more preferably 9 g or more and 13 g or less.

[0041] <Paper towel sheet> The paper towel sheet 1x used in the paper towel roll 1 according to this embodiment contains synthetic fibers together with pulp fibers, and has a high basis weight and high water absorption capacity within a predetermined range described later, so that the tail seal portion 3 is difficult to peel off during the manufacture of the paper towel roll 1, and the tail seal portion 3 is easy to peel off and has little sticky feeling when wet when the paper towel sheet 1x is used, and a paper towel roll 1 that is easy to hold is obtained. If the tail seal portion 3 is easy to peel off during manufacture, the defective product rate will be high, and a part of the peeled paper towel sheet 1x may get caught in the process, causing a process stop, etc., and the process operation rate may decrease. If the tail seal portion 3 is difficult to peel off during use, a part of the tail seal portion 3 may be torn off or the tail seal portion 3 may be split in the width direction, causing a problem that a predetermined amount of the paper towel sheet 1x cannot be taken out at one time. Here, the synthetic fiber is, for example, a fiber-like fiber spun from various thermoplastic resins. The paper towel sheet 1x of the present embodiment may be one ply or two or more plies, but one ply is preferred from the viewpoints of ease of use, ease of adjusting physical properties, etc. The paper towel sheet 1x of the present embodiment is provided with an embossment on the whole or part thereof, as described later.

[0042] In this embodiment, the paper towel sheet 1x has a predetermined high basis weight and high water absorption capacity to obtain the above-mentioned effects, but the above-mentioned effects can be further improved by adjusting the properties of the paper towel sheet 1x other than the basis weight and water absorption capacity to within a predetermined range. The physical properties of the paper towel used in this embodiment will be described below.

[0043] (Basic weight) The basis weight of the paper towel sheet 1x in this embodiment is the total basis weight of the synthetic fiber contained in the paper towel sheet 1x and the pulp fiber contained in the paper towel sheet 1x. The basis weight of one ply of the paper towel sheet 1x is usually 40 g / m 2 More than 150g / m 2 Less than 48g / m 2 More than 110g / m 2Less than 55g / m 2 More than 80g / m 2 The basis weight of one paper towel sheet is 40 g / m 2 If the paper towel sheet 1x has a basis weight of less than 150 g / m, the water absorbency of the paper towel sheet 1x will be too low, making it difficult to use as a roll product. 2 If it exceeds this value, the water absorption of paper towel sheet 1x will be too high, and glue will be absorbed into the inside, reducing the adhesiveness of tail seal portion 3, making tail seal portion 3 more likely to peel off during the manufacture of paper towel roll 1.

[0044] (Synthetic fiber basis weight, pulp fiber basis weight) The basis weight of the synthetic fibers contained in the paper towel sheet 1x is not particularly limited, but is preferably 4 g / m 2 More than 40g / m 2 Less than 7g / m, more preferably 2 More than 30g / m 2 More preferably, 10 g / m 2 More than 20g / m 2 The range is as follows: Synthetic fiber basis weight is 40 g / m 2 If the synthetic fiber basis weight exceeds 4 g / m, the paper towel sheet 1x becomes too hard, and the paper towel sheet 1x becomes too resilient when wound into a roll, and the tail seal portion 3 tends to peel off easily during production. 2 If the grammage is less than 33 g / m, the water absorption of the paper towel sheet 1x becomes too high, the glue is absorbed to the inside, and the adhesiveness of the tail seal portion 3 decreases, so that the tail seal portion 3 is easily peeled off during the production of the paper towel roll 1. In addition, the basis weight of the pulp fiber contained in the paper towel sheet 1x is preferably 33 g / m 2 More than 120g / m 2 Less than 38g / m 2 More than 90g / m 2 More preferably, 45 g / m 2 More than 75g / m 2 The basis weight of the pulp fibre is 120 g / m 2If the paper towel sheet 1x has a basis weight of more than 33 g / m2, the water absorption of the paper towel sheet 1x becomes too high, and the glue is absorbed to the inside, reducing the adhesiveness of the glue portion 2, and the tail seal portion 3 tends to peel off easily during manufacturing. 2 If the paper towel sheet 1x has a water absorption rate of less than 100%, the paper towel sheet 1x tends to have a low water absorption rate and is less convenient to use as a roll product. The basis weight can be measured in accordance with JIS P 8124.

[0045] (Ratio of synthetic fibers to pulp fibers) The proportion of synthetic fibers contained in the paper towel sheet 1x is not particularly limited, but is preferably 5% by weight or more and 50% by weight or less, more preferably 9% by weight or more and 41% by weight or less, and even more preferably 12% by weight or more and 28% by weight or less of the total amount of the paper towel sheet 1x. If the proportion of synthetic fibers exceeds 50% by weight, the water absorption of the paper towel sheet 1x decreases, and the ease of use as a roll product tends to decrease. If the proportion of synthetic fibers is less than 5% by weight, the water absorption of the paper towel sheet 1x becomes too high, and the adhesiveness of the tail portion 3 decreases due to the absorption of glue to the inside, and the tail seal portion 3 becomes easily peeled off during the manufacture of the paper towel roll 1. In addition, the proportion of pulp fibers contained in the paper towel sheet 1x is not particularly limited, but is preferably 50% by weight or more and 95% by weight or less, more preferably 59% by weight or more and 91% by weight or less, and even more preferably 72% by weight or more and 88% by weight or less of the total amount of the paper towel sheet 1x. If the pulp fiber content exceeds 95% by weight, the water absorbency of the paper towel sheet 1x becomes too high, and glue is absorbed into the inside, reducing the adhesiveness of the tail seal portion 3 and making the tail seal portion 3 more likely to peel off during the production of the paper towel roll 1. If the pulp fiber content is less than 50% by weight, the water absorbency of the paper towel sheet 1x decreases, tending to make it less user-friendly as a roll product.

[0046] Pulp fibers may be general pulp fibers such as softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP). The content ratio of NBKP and LBKP in the pulp fibers is preferably NBKP:LBKP=50:50-100:0, more preferably NBKP:LBKP=70:30-100:0, even more preferably NBKP:LBKP=90:10-100:0, and most preferably NBKP:LBKP=100:0. As NBKP, fibers made of, for example, radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir are preferred. Note that NUKP may be used instead of NBKP, and LUKP may be used instead of LBKP. As the synthetic fiber, any of those commonly used in this field can be used, for example, synthetic fibers spun from synthetic resins such as nylon (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, polystyrene, etc. The synthetic fibers can be used alone or in combination of two or more kinds.

[0047] Specific examples of the paper towel sheet 1 are not particularly limited as long as they contain synthetic fibers and pulp fibers and have the basis weight and water absorbency within the above-mentioned ranges, and include, for example, a nonwoven fabric made of a mixture of synthetic fibers and pulp fibers, a laminate of a nonwoven fabric made of synthetic fibers and a pulp fiber web, and a pulp-containing nonwoven fabric. Among these, a pulp-containing nonwoven fabric is preferable from the viewpoint of toughness, touch, etc. The pulp-containing nonwoven fabric is, for example, described in the specification of U.S. Pat. No. 5,284,703, and is a nonwoven fabric and pulp fibers integrated by a hydroentanglement method in which pulp fibers are sprayed onto a nonwoven fabric containing synthetic fibers with a high-pressure water flow. In the pulp-containing nonwoven fabric, the synthetic fibers and pulp fibers constituting the nonwoven fabric are entangled on one surface of the nonwoven fabric to form a pulp fiber web in which the pulp fibers are integrated, and a part of the pulp fibers penetrates the nonwoven fabric in the thickness direction and is exposed on the other surface, so that the nonwoven fabric and the pulp fiber web are extremely firmly bonded and integrated. The nonwoven fabric used for the pulp-containing nonwoven fabric is preferably a spunbonded nonwoven fabric, more preferably a spunbonded nonwoven fabric containing polypropylene fibers.

[0048] (Water absorption) In this embodiment, the water absorption capacity of the paper towel sheet 1x is defined as the water absorption capacity per unit area, but is also defined as the water absorption capacity per unit weight. In this embodiment, the water absorption capacity (per unit area) is usually 210 g / m 2 More than 520g / m 2 Less than 260 g / m 2 More than 430g / m 2 Less than 310 g / m 2 More than 400g / m 2 The water absorption (per unit weight) is usually 3.0 g / g or more and 8.0 g / g or less, preferably 3.5 g / g or more and 7.5 g / g or less, and more preferably 4.0 g / g or more and 7.0 g / g or less. The water absorption (per unit area) is 520 g / m 2 If the water absorption capacity (per unit area) exceeds 210 g / m, the paper towel sheet 1x will absorb the glue, and the tail seal portion 3 will be easily peeled off during manufacturing. 2 If the temperature is less than this, the absorbency of the paper towel sheet 1x will decrease and it will be less convenient to use. In addition, the basis weight and water absorption of the paper towel sheet 1x can be adjusted, for example, by adjusting the basis weight of each of the synthetic fibers and the pulp fibers and the mixing ratio thereof, etc. In this method, the water absorption also changes depending on whether or not embossing is formed, the depth of the embossing, etc.

[0049] The water absorption of 1x paper towel sheet is measured as follows. First, a rectangular test piece with sides of 7.6 cm (3 inches) is cut from a 1-ply paper towel sheet 1x using a square template with each side measuring 7.6 cm. The mass of the test piece before water absorption is measured using an electronic balance. The test piece is set in a holder (a fixture that fixes three points of the test piece, made of a metal that does not absorb water).

[0050] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece set in the holder is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece is taken out of the distilled water together with the holder, and a band 210 is attached to one corner 200d of the test piece 200 as shown in FIG. 6. The band 210 is made by cutting the paper towel sheet (1 ply) to be measured to a size of 3 mm wide x 38 mm long, and attaching it to a part of the test piece 200 6 mm from the corner 200d toward the center. Next, the holder and the test piece 200 are hung on a rod installed in an empty water tank so that the corner 200a facing the corner 200d is on top, and the lid of the water tank is closed and left for 15 minutes. Thereafter, the holder 220 and the test piece 200 are taken out of the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured with an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, 2 Absorption of distilled water per sheet (g water / m 2 , per unit area). 2 Water absorption per sheet (g water / m 2 ) by the basis weight of the test piece 200 to obtain 1m 2 Water absorption per sheet (g water / m 2 ) / grammage (sheet g / sheet m 2 ) = Water absorption per 1g (g water / g sheet, per unit weight). Measurements are carried out five times for each sample, and the average value is used.

[0051] This 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.

[0052] (Seat length) The sheet length between perforations (the length of the paper towel sheet 1x in the roll winding direction R) is not particularly limited, but is preferably 160 mm to 330 mm, more preferably 180 mm to 305 mm, and even more preferably 200 mm to 280 mm. By keeping it within this range, when using a highly absorbent paper towel roll sheet 1x such as in this embodiment, the area used will be appropriate and the amount of water absorption can be improved.

[0053] (paper thickness) The thickness (one ply) of the paper towel sheet 1x according to this embodiment is not particularly limited, but is preferably 200 μm or more and 1400 μm or less, more preferably 400 μm or more and 1200 μm or less, and even more preferably 500 μm or more and 1000 μm or less. If the paper thickness is less than 200 μm, the water absorption capacity of the paper towel sheet 1x will be poor, and if it exceeds 1400 μm, the water absorption capacity of the paper towel sheet 1x will be too high, absorbing the glue portion 2 and causing poor adhesion of the tail seal portion 3, so that the tail portion 3 tends to peel off easily during the manufacture of the paper towel roll 1. The paper thickness was measured using a Peacock paper thickness gauge (manufactured by Ozaki Seisakusho Co., Ltd.) for one sheet of paper towel sheet 1x, at 37.85 gf / cm. 2 The measurement is made under load, and the measurement is repeated 10 times at different points and the average of the measurements is taken to determine the paper thickness.

[0054] (Embossed) The paper towel sheet 1x of this embodiment is preferably embossed, and more preferably embossed by a roll winder. The shape of the embossed portion is not particularly limited, and may be, for example, a circle, an ellipse, a rectangle, a square, a floral pattern, a polygon, a letter, a line, a logo, etc. In order to obtain a paper towel sheet 1x with a high basis weight and excellent water absorption as in this embodiment, a hexagonal shape is preferable.

[0055] In the embossing pattern, the embossing depth is preferably 0.07 mm to 1.8 mm, more preferably 0.2 mm to 1.2 mm, and even more preferably 0.3 mm to 0.8 mm. If the embossing depth is less than 0.07 mm, the cosmetic properties and water absorbency of the paper towel sheet 1x are poor, and the ease of use as a roll product is poor. If the embossing depth exceeds 1.80 mm, the adhesive area of ​​the glue portion 2 is small, and the tail seal portion 3 is easily peeled off during the manufacture of the paper towel roll 1.

[0056] The depth of the embossing is measured using a microscope. As a microscope, a product name "One Shot 3D Measuring Macroscope VR-3100" manufactured by KEYENCE Corporation can be used. As software for observing, measuring, and analyzing microscope images, a product name "VR-H1A" can be used. The measurement conditions are a magnification of 12 times and a field of view area of ​​24 mm x 18 mm. The measurement magnification and field of view area may be changed as appropriate depending on the desired size of the embossing.

[0057] FIG. 3 shows a height profile on the XY plane taken by a microscope, and the height of the surface of the paper towel sheet 1x is represented by shading. Linear areas in FIG. 3 that are shaded differently from the surroundings indicate individual embossments. The depth of the embossment is determined by measuring the height difference of the embossment using the microscope. The measurement is performed on the surface 1a side of the paper towel sheet 1x. In addition, when measuring, three revolutions of the paper towel sheet 1x are removed from the paper towel roll 1, and the fourth revolution of the paper towel sheet 1x is used to measure the sheet state. In addition, if there are perforations, all of them are avoided in the measurement.

[0058] First, a line segment AB is drawn as shown in FIG. 3 to obtain a height profile as shown in FIG. 4. The line segment AB may be drawn so as to cross the embossments. The line segment AB is drawn in the roll width direction W (CD direction) of the paper towel sheet 1x, but if the interval between the embosses is narrow, for example, 2 mm or less, and the height of the convex portion described below becomes low, the line segment may be drawn diagonally or in the roll winding direction R. The height profile is a (measured) cross-sectional curve S1 that represents the unevenness of the actual sample surface of the paper towel sheet 1x, but it also includes noise (steep peaks due to fiber clumps on the surface of the paper towel sheet 1x, fibers that grow in a whisker-like shape, or areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness.

[0059] Therefore, the (measured) cross-sectional curve S1 in FIG. 4 is smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the cross-sectional curve S2 in FIG. 5. The smoothing using the filter of the weighted average radio button can be obtained automatically by using the above-mentioned analysis software. Then, in the graph shown in FIG. 5, the average value of the maximum values ​​on the vertical axis of the graph of the convex part H1 and the convex part H2 adjacent to the convex part H1 is calculated, and the minimum value on the vertical axis of the concave part D1 sandwiched between the convex parts H1 and H2 is obtained. The value obtained by subtracting the minimum value from the average value of the maximum values ​​thus obtained is set as the provisional emboss depth. Then, as shown in FIG. 5, the same measurement is performed on a total of two consecutive locations on the cross-sectional curve (a total of two consecutive locations of the concave part D1 and the concave part D2 sandwiched between the convex parts H3 and H4) (two measurement results are obtained at this point). Then, the paper towel roll 1 is rotated 90 degrees three times in the roll winding direction R of the paper towel sheet 1x, and the same measurements as above are taken at each position (a total of four measurement positions in the roll winding direction R), and the average value of the total of eight positions (2 x 4) is ultimately used as the embossing depth.

[0060] (DMDT and DCDT) The tensile strength DMDT (Dry Machine Direction Tensile Strength) in the machine direction (MD direction: roll winding direction R) when dry based on JIS P 8113 of the two plies of the paper towel sheet 1x is preferably 8N / 25mm or more and 75N / 25mm or less, more preferably 13N / 25mm or more and 65N / 25mm or less, and even more preferably 20N / 25mm or more and 50N / 25mm or less. The tensile strength DCDT (Dry Cross Direction Tensile Strength) in the cross direction (CD direction: roll width direction W) when dry is preferably 2N / 25mm or more and 50N / 25mm or less, more preferably 4N / 25mm or more and 40N / 25mm or less, and even more preferably 5N / 25mm or more and 25N / 25mm or less. If the DMDT of paper towel sheet 1x exceeds 75 N / 25 mm and / or the DCDT exceeds 50 N / 25 mm, paper towel sheet 1x becomes too hard, causing strong resilience when paper towel sheet 1x is wound up, and tail seal portion 3 tends to peel off easily during production of paper towel roll 1. If the DMDT of paper towel sheet 10x is less than 8 N / 25 mm and / or the DCDT is less than 2 N / 25 mm, paper towel sheet 1x has a low basis weight and poor water absorbency.

[0061] (Bending strength) The bending stiffness in the MD direction of the paper towel sheet 1x is preferably 10 μN·m to 130 μN·m, more preferably 17 μN·m to 100 μN·m, and even more preferably 20 μN·m to 50 μN·m. If the bending stiffness in the MD direction of the paper towel sheet 1x is less than 10 μN·m, the basis weight of the paper towel sheet 1x will be low and the water absorbency will be poor. If the bending stiffness in the MD direction of the paper towel sheet 1x exceeds 130 μN·m, the paper towel sheet 1x will be too hard, and the resilience of the paper towel sheet 1x will be strong when wound into a roll, and the tail seal portion 3 will be easily peeled off during the manufacture of the paper towel roll 1.

[0062] The bending stiffness in the MD direction of paper towel sheet 1x can be measured using an L&W bending tester (Lorentzen & Wettre) in accordance with the method described in ISO2493. For a test piece of paper towel sheet 1x with a width of 38 mm (CD direction) and a length of 100 mm (MD direction), the bending angle is 15 degrees and the bending length (span of the sample stage) is 10 mm. The bending stiffness (μN·m) is calculated using the following formula. If a test piece with a length of 100 mm cannot be obtained, the length of the test piece can be shortened. Bending stiffness (μN·m) = 60 × bending resistance (mN) × bending length 10 (mm) 2 ÷(π × bending angle 15 (degrees) × sample width 38 (mm))

[0063] <Method of manufacturing paper towel sheets and paper towel rolls> As a method for manufacturing the paper towel sheet 1x and the paper towel roll 1, when the paper towel sheet 1x is a kitchen towel sheet containing synthetic fibers and pulp fibers, it can be manufactured, for example, in the following order: (1) laminating pulp fibers on a predetermined spunbond nonwoven fabric and hydroentangling, (2) heat embossing with a matched steel, (3) perforation processing, and (4) roll winding processing. In this case, in the (1) hydroentangling of the manufacturing method, the pulp fibers are hydroentangled with the synthetic fibers to obtain a nonwoven fabric containing synthetic fibers and pulp fibers. The hydroentangling method is preferably performed, for example, by the method described in JP 2018-193634 A.

[0064] Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments, and it is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. Moreover, it is clear from the description of the claims that the embodiments with such modifications or improvements can also be included in the technical scope of the present invention. EXAMPLES

[0065] The present embodiment will be described more specifically below with reference to examples and comparative examples.

[0066] (Examples 1 to 28, Comparative Examples 1 to 11) Through the papermaking and creping processes, embossing process, roll winding process, and tail seal glue application process, synthetic fibers and pulp fibers were used in the ratios (weight %) shown in Tables 1 and 2 to make paper with the paper thickness and sheet length shown in Tables 1 and 2, and embossing was formed to produce one-ply paper towels for Examples 1 to 28 and Comparative Examples 1 to 11. Here, polypropylene resin fibers were used as the synthetic fibers, and a PVA mixed aqueous solution of less than 10 weight % was used as the glue.

[0067] Using the obtained paper towels of Examples 1 to 28 and Comparative Examples 1 to 11, roll bodies of Examples 1 to 28 and Comparative Examples 1 to 11 were produced having the winding diameter, winding length, roll width, roll weight, roll density, tail length, peel strength, glue application amount, and glue application width shown in Tables 1 and 2. The obtained paper towels and roll bodies were evaluated as follows. The results are shown in Tables 1 to 3.

[0068] [Evaluation method (physical property evaluation)] Paper Thickness: 37.85gf / cm for one paper towel sheet measured with a Peacock thickness gauge 2 Measurements were taken under load. Bending stiffness: Bending stiffness was measured using an L&W bending tester (Lorentzen & Wettre) in accordance with ISO 2493. For a test piece 38 mm wide and 100 mm long, the measured value when the bending angle was 15 degrees and the bending length (span of the sample stage) was 10 mm was taken as the bending resistance (load), and the bending stiffness (μN·m) was calculated using the following formula. Bending stiffness (μN·m) = 60 × bending resistance (mN) × bending length 10 (mm) 2 ÷(π × bending angle 15 (°) × sample width 38 (mm)) DMDT, DCDT: The tensile strength in the longitudinal and transverse directions in a dry state was measured based on JIS P9113. Water absorption: A paper towel is cut into a 75mm x 75mm square to prepare a sample piece, and its dry weight is measured. Next, this sample piece is immersed in distilled water for 2 minutes, and then hung in a container saturated with water vapor so that one corner of the sample piece becomes the top apex, and this apex and the two adjacent corners are supported and the sample is hung in an extended state (100% RH), left for 30 minutes, and the weight after draining is measured. Paper towels cut to 3 x 38 mm are used for draining. The measured values ​​are then recorded as the water retention per gram of sample piece (g / g) and the water retention per 1m 2 Water retention per unit (g / m 2 ) was converted. Embossing depth: The embossing depth is measured using a microscope. The microscope used is a Keyence One Shot 3D Measuring Macroscope VR-3100. The microscope image observation, measurement, and image analysis software used is the VR-H1A. The measurement conditions are a magnification of 12x and a viewing area of ​​24mm x 18mm. Roll density: Calculated by (roll mass)÷(roll volume). The roll mass is the mass of the roll per 280 mm of roll width. The roll volume is [{cross-sectional area of ​​the roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​the core outer diameter)] x roll width (converted per 280 mm). Peel strength: Dry peel strength determined by 180 degree peel test using a Tensilon universal testing machine

[0069] [Evaluation method] The manufactured paper towel sheets and paper towel rolls were evaluated based on sensory evaluation or actual measurements for the difficulty of peeling off the tail seal during manufacturing, the ease of peeling off the tail seal during use, water absorbency, ease of holding, and adhesive feel when wet.

[0070] "Difficulty in peeling off the tail seal during manufacturing" was evaluated by counting the number of rolls with peeled tail seals out of 30 paper towel rolls after manufacturing and rating them on a 5-point scale. The evaluation criteria are as follows: ◎: 0 to 1 roll with the tail seal partially or completely peeled off ○: 2 to 4 rolls with partial or complete tail seal peeling △: 5 to 7 rolls with part or all of the tail seal peeled off ×: 8 to 14 rolls with partial or complete tail seal peeling ××: 15 or more rolls with partially or completely peeled tail seals

[0071] "Ease of peeling off the tail seal when in use" was evaluated by 30 monitors on how easy it was to peel off the tail seal of a paper towel roll, and was rated on a 5-point scale based on the number of people who felt it was "difficult to peel off" or "unable to peel off." The evaluation criteria were as follows: ◎: 0-1 people felt it was "difficult to peel off" or "unable to peel off" ○: 2-4 people felt it was "difficult to peel off" or "unable to peel off" △: 5-7 people felt it was "difficult to peel off" or "unable to peel off" ×: 8-14 people felt it was "difficult to peel off" or "unable to peel off" ××: 15 or more people felt it was "difficult to peel off" or "unable to peel off"

[0072] The "water absorbency" was evaluated on a four-point scale by measuring the amount of water absorbed per unit area. The evaluation criteria are as follows: ◎: 330g / m 2 When the above ○:270g / m 2 More than 330g / m 2 When less than △:230g / m 2 More than 270g / m 2 When less than ×:230g / m 2 When less than

[0073] For "ease of holding," 30 monitors evaluated the ease of holding the manufactured paper towel rolls, and rated them on a four-point scale based on the number of people who felt it was "difficult to hold." The evaluation criteria are as follows: ◎: 0-3 people felt it was "difficult to hold" ○: 4-6 people felt it was "difficult to hold" △: 7-10 people felt it was "difficult to hold" ×: 11 or more people felt it was "difficult to hold"

[0074] For "stickiness when wet," 30 monitors sensorily evaluated the stickiness of the paper towel sheet when it was wetted with water, and rated it on a four-point scale based on the number of people who felt it was "sticky." The evaluation criteria are as follows: ◎: 0-3 people felt it was "sticky" ○: 4-6 people felt that the product was "sticky" △: 7-10 people felt it was "sticky" ×: 11 or more people felt that the product was "sticky"

[0075] [Table 1]

[0076] [Table 2]

[0077] [Table 3]

[0078] From the above, it can be seen that the paper towel roll of this embodiment is a paper towel roll with a high basis weight and high water absorbency, which is capable of achieving both a tail seal that is difficult to peel off during manufacturing, ease of peeling off the paper towel during use, and little stickiness when wet, while also ensuring ease of holding. [Explanation of symbols]

[0079] 1 paper towel roll 1a surface 1b back side 1c The outermost edge of a paper towel roll 1x Paper Towel Sheet 2 Tail seal glue 3 Tail seal part 4 Tail section 200 test pieces 200a, 200d corner 210 Obi 220 Holder

Claims

1. A paper towel roll is a roll of a 1-ply paper towel sheet that contains mainly pulp fibers and synthetic fibers. A tail seal portion is provided by gluing the tail portion of the paper towel sheet to the outermost peripheral surface of the paper towel roll, The paper towel sheet has a basis weight of 40 g / m ２ 150g / m or more ２ below, Water absorption capacity: 210g / m ２ More than 520g / m ２ is as follows: The amount of glue applied is 0.5 g or more and 5 g or less, The paper towel roll has a roll density of 0.05 g / cm ３ 0.19g / cm or more ３ Hereinafter, a paper towel roll having a winding diameter of 75 mm or more and 160 mm or less.

2. 2. The paper towel roll according to claim 1, wherein the glue application width is 2 mm or more and 30 mm or less.

3. 3. The paper towel roll of claim 1, wherein the length of the tail portion is 4 mm or more and 45 mm or less.

4. 4. The paper towel roll according to claim 1, wherein the thickness of the paper towel sheet is 200 μm or more and 1400 μm or less.

5. 5. The paper towel roll according to claim 1, wherein the glue has a peel strength of 0.6 N / 76 mm or more and 8 N / 76 mm or less.

6. 6. The paper towel roll according to claim 1, wherein the paper towel sheet has an embossed surface, and the embossed surface has a depth of 0.07 mm or more and 1.8 mm or less.

7. 7. The paper towel roll according to claim 1, wherein the bending stiffness of the paper towel sheet in the MD direction is 10 μN·m or more and 130 μN·m or less.

8. 8. The paper towel roll of claim 1, wherein the paper towel sheet has a DMDT of 8 N / 25 mm or more and 75 N / 25 mm or less, and a DCDT of 2 N / 25 mm or more and 50 N / 25 mm or less.

9. 9. The paper towel roll according to claim 1, wherein the proportion of the synthetic fibers in the paper towel sheet relative to the total basis weight is 5% by weight or more and 50% by weight or less, and the proportion of the pulp fibers in the paper towel sheet is 50% by weight or more and 95% by weight or less.

10. The synthetic fiber has a basis weight of 4 g / m ２ 40g / m or more ２ Hereinafter, the basis weight of the pulp fiber is 33 g / m ２ 120g / m or more ２ 10. The paper towel roll of claim 9, wherein:

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