Kitchen towel roll and kitchen towel roll package

Abstract

To provide a kitchen towel roll that has excellent water absorption, has a roll density within a certain range, is easy to mount in a paper holder, has a core cost within a certain range, and has a core hard to be crushed, and a kitchen towel roll package.SOLUTION: A kitchen towel roll is formed by winding a kitchen towel sheet in a roll shape. The kitchen towel sheet is formed by laminating sheets applied with an emboss pattern into two plies or three plies. The kitchen towel sheet has a basis weight of equal to or greater than 30 g / m2 and equal to or less than 59 g / m2, a paper thickness of equal to or greater than 2.29 mm and equal to or less than 4.25 mm, and an amount of water absorption of 300 g / m2 and equal to or less than 700 g / m2. The kitchen towel roll has a winding diameter of equal to or greater than 130 mm and equal to or less than 170 mm, a roll density of equal to or greater than 0.050 g / cm3 and equal to or less than 0.120 g / cm3, a core apparent basis weight of equal to or greater than 250 g / m2 and equal to or less than 650 g / m2, and a roll winding softness of equal to or greater than 1.2 mm and equal to or less than 4.2 mm.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to kitchen towel rolls and kitchen towel roll packages. [Background technology]

[0002] Kitchen towels are becoming longer, but high-quality products require not only longer lengths but also higher quality. Among these, kitchen towel sheets made using the so-called TAD (Through Air Dryer, also known as Through Air Drying) papermaking technology are thick, soft, and highly absorbent.

[0003] However, kitchen towel sheets made with TAD papermaking technology are bulky, and even if the roll density is reduced, the roll is tightly wound, and the core (paper tube) is easily crushed when cut with a log saw. Conversely, if the roll is not tightly wound, the winding diameter becomes larger, making it difficult to attach to a paper holder. Increasing the basis weight of the core to prevent core crushing increases costs. On the other hand, Patent Document 1 discloses a kitchen towel sheet that has a core that is difficult to crush without compromising costs or productivity, and that is excellent in space saving when carried or stored. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-013336 Summary of the Invention [Problem to be solved by the invention]

[0005] While kitchen towel sheets obtained using TAD papermaking technology have excellent water absorption, they are bulky, and even using conventional technology, it is difficult to create a kitchen towel roll that is easy to attach to a paper holder and whose core will not collapse without incurring additional costs for the core.

[0006] Therefore, an object of the present invention is to provide a kitchen towel roll and a kitchen towel roll package that have excellent water absorption, a roll density within a certain range so that they can be easily attached to a paper holder, and a core cost within a certain range that is resistant to crushing. [Means for solving the problem]

[0007] As a result of extensive research into achieving the above-mentioned objectives, the inventors discovered that the objectives could be achieved by setting the roll density, basis weight, paper thickness, apparent basis weight of the core (paper tube), roll softness, water absorption, and winding diameter of the kitchen towel roll within predetermined ranges, and thus completed the present invention.

[0008] (1) The first aspect of the present invention is a kitchen towel roll obtained by winding up a kitchen towel sheet in a roll, the kitchen towel sheet being formed by laminating two or three plies of sheets having an embossed pattern, and the basis weight of the kitchen towel sheet being 30 g / m 2 More than 59g / m 2 The paper thickness is between 2.29mm and 4.25mm, and the water absorption is 300g / m 2 More than 700g / m 2 The roll diameter of the kitchen towel roll is 130 mm or more and 170 mm or less, and the roll density is 0.050 g / cm 3 More than 0.120g / cm 3 Below, the apparent basis weight of the paper tube is 250 g / m 2 More than 650g / m 2 The following are kitchen towel rolls with a roll softness of 1.2 mm or more and 4.2 mm or less. (2) In a second aspect of the present invention, the winding density of the kitchen towel roll is 0.20 m / cm 2 More than 0.56m / cm 2 The kitchen towel roll is as follows: (1) (3) A third aspect of the present invention is the kitchen towel roll according to (1), wherein the water absorption per unit mass of the kitchen towel sheet is 8.0 g / g or more and 15.0 g / g or less. (4) A fourth aspect of the present invention is the kitchen towel roll according to (1), wherein the embossed pattern includes a linear embossed pattern. (5) A fifth aspect of the present invention is the kitchen towel roll according to (1), wherein the paper tube contains a total of 50% or more of softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP), and the proportion of LBKP in the total amount of the NBKP and the LBKP is 50% or more. (6) A sixth aspect of the present invention is the kitchen towel roll described in (4), wherein the embossing pattern includes radial embossings and closed-ring structure embossings, and the radial embossings and the closed-ring structure embossings are alternately arranged at equal intervals. (7) A seventh aspect of the present invention is the kitchen towel roll according to (1), wherein the kitchen towel sheet has a wet pulp content of 50% or more. (8) An eighth aspect of the present invention is the kitchen towel roll according to (1), wherein the kitchen towel sheet contains 40% to 100% softwood bleached kraft pulp (NBKP) and 60% to 0% hardwood bleached kraft pulp. (9) A ninth aspect of the present invention is the kitchen towel roll according to (1), in which the roll mass of the kitchen towel roll is 170 g or more and 550 g or less. (10) A tenth aspect of the present invention is the kitchen towel roll according to (1), in which the paper core of the kitchen towel roll has a mass of 10 g or more and 25 g or less. (11) An eleventh aspect of the present invention is the kitchen towel roll according to (1), wherein the roll length is 18 m or more and 45 m or less. (12) A twelfth aspect of the present invention is the kitchen towel roll according to (1), wherein the kitchen towel sheet has a sheet width of 260 mm or more and 300 mm or less. (13) A thirteenth aspect of the present invention is the kitchen towel roll according to (1), wherein the outer diameter of the paper core of the kitchen towel roll is 20 mm or more and 60 mm or less. (14) In a fourteenth aspect of the present invention, the specific volume of the kitchen towel sheet is 7.7 cm 3 / g or more 24.5cm 3 / g or less. (15) A fifteenth aspect of the present invention is the kitchen towel roll according to (1), wherein the product of the apparent basis weight of the paper core and the value of the roll winding softness is 5.0 or more and 25.0 or less. (16) A sixteenth aspect of the present invention is a kitchen towel roll package in which two or three rolls of the kitchen towel roll according to (1) are arranged side by side and packaged in a film. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a kitchen towel roll and a kitchen towel roll package that have excellent water absorption, a roll density within a certain range, are easy to attach to a paper holder, have a core cost within a certain range, and have a core that is not easily crushed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a kitchen towel roll packaging according to an embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Figure 3] 1 is a schematic plan view showing the relationship between the heat-sealed portion and the perforations on the top surface (or bottom surface) of the kitchen towel roll packaging. FIG. [Figure 4] FIG. 2 is a diagram showing an example of an embossing pattern in the kitchen towel roll of the present embodiment. [Figure 5] FIG. 2 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the present embodiment. [Figure 6] 1 is a diagram showing a part of the papermaking process for the kitchen towel sheet of the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0012] Furthermore, in this specification, terms with "abbreviation" attached indicate the meaning of the term excluding "abbreviation" within the scope of common technical knowledge of a person skilled in the art, and also include the meaning itself excluding "abbreviation." Furthermore, the upper and lower limit values ​​disclosed in this specification can be any combination. Furthermore, when a numerical range is indicated with "to," the values ​​between "to" are included.

[0013] The embodiment of the present invention is a kitchen towel roll 10 obtained by winding up a kitchen towel sheet 10x made by laminating two or three plies of base paper made using a paper machine, imparting an embossed pattern to the base paper. The kitchen towel roll 10 and the kitchen towel sheet 10x will be described in detail below.

[0014] <Base paper for kitchen towel rolls> The base paper for kitchen towel rolls according to the embodiment of the present invention can be produced by a general papermaking method. Specifically, when dry pulp (sheet) or wet pulp (sheet) is used, the papermaking raw material (pulp) is dissociated in water at a predetermined concentration in a pulper (tank) to form pulp slurry. When using slush pulp, a pulper is not required. Next, in a process (tank) called a chest or seed box, other papermaking chemicals are appropriately mixed to form a paper stock. This paper stock is sent to a stock inlet (head box) and sprayed onto a wire from the stock inlet. The paper stock on the wire is dewatered using a dewatering roll to form a wet web. This wet web is transported to the dryer section by a fabric or other device and dried. When a TAD papermaking machine is used in the papermaking process, a TAD is used for the dryer section. After passing through the dryer section, the web is wound by a winder to become the base paper for kitchen towel rolls. The winder may also be used to slit the web to adjust the width or to shorten the wound length. Calendaring may also be performed. The kitchen towel roll base paper is given an embossed pattern and laminated in two or three plies to form kitchen towel sheet 10x, which is then wound up to a specified length around paper tube 20 and cut to a specified width to form kitchen towel roll 10. Kitchen towel roll 10 is then wrapped in film to form the final product in the form of kitchen towel roll package 1. Note that in the process of processing the kitchen towel roll base paper into the final product form, the speed at which the base paper is unwound is slower than the speed at which it is wound up around paper tube 20 (also known as the draw), and the paper is wound up in a taut (pulled) state, so the basis weight often changes (the basis weight after processing is lower than the basis weight of the base paper).

[0015] (Wet pulp content) In this embodiment, the wet pulp content of the pulp used as the raw material is preferably 50% by mass or more and 100% by mass or less. Here, wet pulp refers to pulp with a solid content of 70% by mass or less. The solid content of dry pulp (sheet) is approximately 90% by mass. The lower limit of the above range of the wet pulp content (solid content by mass %) is preferably 70% by mass or more, and more preferably 90% by mass or more. If the wet pulp content is less than 50% by mass, the water absorption capacity of the kitchen towel sheet 10x may be poor.

[0016] Pulp used as a raw material may include, for example, softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP). When NBKP and LBKP are used, the content ratios are preferably NBKP:LBKP = 40-100% by mass:60-0% by mass, more preferably NBKP:LBKP = 50-90% by mass:50-10% by mass, and even more preferably NBKP:LBKP = 60-80% by mass:40-20% by mass. If the NBKP content is less than the above-mentioned lower limit, the paper may be prone to tearing upon water absorption. If the NBKP content exceeds the above-mentioned upper limit, the cost may increase. If the LBKP content is less than the above-mentioned lower limit, the cost may increase, and if it exceeds the above-mentioned upper limit, the paper may be prone to tearing upon water absorption.

[0017] <Kitchen towel roll> FIG. 2 is a perspective view of the kitchen towel roll 10 according to this embodiment.

[0018] As shown in Figure 2, the kitchen towel roll 10 according to this embodiment is a kitchen towel roll 10 in which a kitchen towel sheet 10x is wound around a paper tube 20 (hereinafter also referred to as a core) and wound into a roll. Preferably, the kitchen towel sheet 10x is perforated in the width direction of the roll at approximately equal intervals in the winding direction of the roll (not shown).

[0019] 2, the surface of kitchen towel sheet 10x facing the outside of the roll is referred to as surface 10a (surface of kitchen towel sheet 10x), and the surface facing the center of the roll is referred to as back surface 10b (back surface of kitchen towel sheet 10x). Also, the edge of kitchen towel sheet 10x is referred to as outermost edge 10e of kitchen towel roll 10.

[0020] The kitchen towel roll 10 can be used, for example, as a roll of kitchen paper (sometimes called paper towel or cooking paper) used in home kitchens, restaurant kitchens, etc. to wipe away moisture or oil, remove dirt, etc. (kitchen paper roll), as well as other rolls of sanitary paper.

[0021] (winding length and winding diameter) The winding length of the kitchen towel roll 10 is preferably 18 m or more and 45 m or less. The lower limit of the above range of winding length is more preferably 22 m or more, and even more preferably 27 m or more. The upper limit of the above range of winding length is more preferably 40 m or less, and even more preferably 31 m or less. If the winding length is less than the above lower limit, the roll density will be low, making it difficult to attach to a paper holder. If the winding length exceeds the above upper limit, the roll density will be high, and the core may be more likely to be crushed.

[0022] The roll length is preferably measured as follows: First, the length of 10 sheets of kitchen towel sheets 10x between the perforations of kitchen towel roll 10 is measured. Next, the number of sheets in kitchen towel roll 10 is measured, and the roll length is calculated 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 the number of sheets is 150, the roll length is 1.80 m × (150 / 10) = 27 m. Note that if kitchen towel roll 10 does not have perforations, it is preferable to measure the roll length.

[0023] The roll diameter DR of the kitchen towel roll 10 is 130 mm or more and 170 mm or less. The lower limit of the above range of roll diameter DR is preferably 135 mm or more, more preferably 142 mm or more. The upper limit of the above range of roll diameter DR is preferably 165 mm or less, more preferably 156 mm or less. If the roll diameter DR is less than the above lower limit, the water absorbency will be poor. Furthermore, if the roll length exceeds the above upper limit, it will be difficult to attach to a paper holder.

[0024] The roll diameter DR of the roll is measured, for example, using a diameter rule manufactured by Muratec KDS Co., Ltd. Preferably, the measurement is performed on three kitchen towel rolls 10 and the measurement results are averaged.

[0025] (sheet width) The sheet width of the kitchen towel sheet 10x is preferably 200 mm or more and 320 mm or less. The lower limit of the above sheet width range is more preferably 220 mm or more, and even more preferably 275 mm or more. The upper limit of the above sheet width range is more preferably 310 mm or less, and even more preferably 290 mm or less. If the sheet width is less than the above lower limit or exceeds the above upper limit, it may be difficult to attach the sheet to a paper holder.

[0026] (roll mass) The roll mass of the kitchen towel roll 10 is preferably 170 g or more and 550 g or less. The lower limit of the above range of roll mass is more preferably 280 g or more, and even more preferably 320 g or more. The upper limit of the above range of roll mass is more preferably 450 g or less, and even more preferably 420 g or less. If the roll mass is below the above lower limit, the water absorption may be poor. On the other hand, if the roll mass exceeds the above upper limit, the roll density increases and the core becomes more likely to collapse.

[0027] The roll mass is the mass per 280 mm of roll width, not including the paper tube (core) 20 of the kitchen towel roll 10. If the roll width is not 280 mm, it is converted to the mass per 280 mm by proportional calculation.

[0028] (roll density) The roll density of the kitchen towel roll 10 according to this embodiment is 0.050 g / cm 3 More than 0.120g / cm 3 The lower limit of the above range of the roll density is preferably 0.060 g / cm or less. 3 More preferably, it is 0.070 g / cm or more. 3 The upper limit of the above range of the roll density is preferably 0.095 g / cm 3 or less, more preferably 0.090 g / cm 3 If the roll density is below the lower limit, the core will not collapse, but the winding diameter DR will be large, making it difficult to attach to the paper holder. If the roll density exceeds the upper limit, the winding will be too tight, making the core more likely to collapse.

[0029] The roll density is expressed as (roll mass) ÷ (roll volume). The roll mass is the mass of the kitchen towel roll 10 per 280 mm of roll width. The roll volume is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter DR)} - (cross-sectional area of ​​the cardboard core outer diameter DI of the cardboard core 20)] × roll width (converted per 280 mm). For example, if the roll mass (excluding the core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the cardboard core outer diameter DI is 39 mm, the roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(280mm÷10)]=0.08g / cm 3 This becomes:

[0030] (winding density) The winding density of the kitchen towel roll 10 according to this embodiment is 0.20 m / cm 2 More than 0.56m / cm 2 The lower limit of the above range of winding density is more preferably 0.23 m / cm or less. 2 More preferably, it is 0.25 m / cm 2 The upper limit of the above range of winding density is more preferably 0.52 m / cm2 More preferably, it is 0.48 m / cm or less. 2 If the winding density is below the lower limit, the core will not be crushed, but the winding diameter DR will be large, which may make it difficult to attach the core to the paper holder. If the roll density exceeds the upper limit, the core will be tightly wound and may be easily crushed.

[0031] 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 outer diameter (winding diameter DR) part of the roll - (cross-sectional area of ​​the cardboard tube outer diameter DI part of the cardboard tube 20)}. For example, in the case of a winding length of 27 m, 2 plies, a winding diameter DR of 150 mm, and a cardboard tube 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 This becomes:

[0032] (Roll softness) The roll winding softness of the kitchen towel roll 10 according to this embodiment is 1.2 mm or more and 4.2 mm or less. The lower limit of the above range of roll winding softness is preferably 1.5 mm or more, and more preferably 1.8 mm or less. The upper limit of the above range of roll winding softness is preferably 3.5 mm or less, and more preferably 3.0 mm or less. If the roll winding softness is below the above lower limit, the roll will be tightly wound and the core will be easily crushed. On the other hand, if the roll winding softness exceeds the above upper limit, the core will not be crushed, but the roll diameter DR will be large, making it difficult to fit into a paper holder.

[0033] (Method for measuring roll softness) The winding softness of the kitchen towel roll is measured using a compression tester (KES-G5 handy compression tester manufactured by Kato Tech Co., Ltd.) as follows: The direction parallel to the axis of the kitchen towel roll is defined as the height direction, and the direction perpendicular to the tangent to the circumference of the kitchen towel roll is defined as the radial direction. First, place the kitchen towel roll horizontally on a hard surface so that the axis is horizontal. Then, place the KES-G5 compressor (area 2.0 cm) at the center of the height of the kitchen towel roll. 2 ) is pressed from above in the radial direction at a speed of 10 mm / min. The pressure with which the compressing element presses the roll is 5 gf / cm 2 The indentation depth when the pressure is 150gf / cm 2 The indentation depth at this point is defined as Tm, and (Tm - T0) is calculated. Next, the kitchen towel roll is rotated 90 degrees circumferentially around its central axis as the axis of rotation, and the indentation depths Tm and T0 are measured in the same manner as above, and the difference between Tm and T0 (Tm - T0) is calculated. Each kitchen towel roll is measured twice as described above. That is, for three kitchen towel rolls, each is measured twice, and the average of the six measurement results (= two times per roll x 3 rolls) is used as the final winding softness.

[0034] (Paper tube (core)) The kitchen towel roll 10 according to this embodiment preferably has a paper tube 20 (core) at its center that is parallel to the axial direction. The paper tube 20 is a core around which the kitchen towel sheet 10x is wound, and may have, for example, a generally cylindrical cross section. The paper tube 20 is made of multiple layers of base paper, and preferably two layers. The paper tube 20 preferably contains a total of 50% or more of softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP) as pulp fibers contained in the base paper. A total of 70% or more is more preferable, and a total of 90% or more is even more preferable. This facilitates operation when winding a sheet with irregularities originating from the paper machine. As a result, yield is improved and manufacturing costs are reduced. Furthermore, the content of LBKP in the total amount of NBKP and LBKP is preferably 50% or more, more preferably 70% or more, and even more preferably 90% or more. If the content of LBKP in the total amount of NBKP and LBKP is less than 50%, the cost will be high.

[0035] (Paper tube outer diameter) The cardboard tube outer diameter DI, which is the outer diameter of the cardboard tube 20 (core) that forms the core of the kitchen towel roll 10, is preferably 20 mm or more and 60 mm or less. The lower limit of the above range of the cardboard tube outer diameter DI is more preferably 30 mm or more, and even more preferably 38 mm or more. The upper limit of the above range of the cardboard tube outer diameter DI is more preferably 55 mm, and even more preferably 50 mm or less. If the cardboard tube outer diameter DI is below the above lower limit, it may be difficult to fit the roll into a paper holder. Furthermore, if the cardboard tube outer diameter DI exceeds the above upper limit, the reel diameter DR will be large, and it may be difficult to fit the roll into a paper holder.

[0036] The outer diameter DI of the paper tube can be measured, for example, using a diameter rule manufactured by Muratec KDS Co., Ltd. Preferably, the measurement is performed on three kitchen towel rolls 10 and the measurement results are averaged.

[0037] (Mass and basis weight of paper core) The mass of the cardboard tube (core) 20 is preferably 10 g or more and 25 g or less. The lower limit of the above range of the mass of the core is 12 g / m 2 More preferably, it is 14 g / m or more. 2 The upper limit of the above range of the core mass is 20 g / m 2 More preferably, it is 17 g / m or less. 2 If the lower limit of the core mass is less than the above-mentioned lower limit, the core is likely to be crushed, whereas if the core mass exceeds the above-mentioned upper limit, the cost increases. The apparent basis weight of the core is expressed as (mass of the core) ÷ (external surface area of ​​the core). The mass and external surface area of ​​the core are the mass and external surface area of ​​the core converted per roll width. For example, if the mass of the core per roll width of 281 mm is 16 g and the outer diameter of the core is 44 mm, the apparent basis weight of the core = 16 ÷ {(3.14 × 44 mm / 1000) × (281 mm / 1000)} = 412 g / m 2Here, a core is usually made by gluing two sheets of core base paper together with adhesive, etc., and there are some areas where the two sheets of core base paper overlap, making it thicker, so it is different from a simple sheet rolled up, and therefore the "apparent" basis weight is used. The apparent weight of the core is 250 g / m 2 More than 650g / m 2 The lower limit of the above range of the apparent basis weight of the core is preferably 300 g / m 2 More preferably, it is 380 g / m or more. 2 The upper limit of the above range of the apparent basis weight of the core is preferably 520 g / m 2 More preferably, 450 g / m 2 If the apparent basis weight of the core is less than the above-mentioned lower limit, the core is easily crushed, whereas if the apparent basis weight of the core is more than the above-mentioned upper limit, the cost increases.

[0038] (apparent basis weight of paper tube x roll winding softness) The product of the apparent basis weight and roll winding softness of the paper tube 20 (core) of the kitchen towel roll 10 according to this embodiment is preferably 5.0 or more and 25.0 or less. The lower limit of the above range of the product of the apparent basis weight and roll winding softness of the core is more preferably 6.5 or more, and even more preferably 9.0 or more. The upper limit of the above range of the product of the apparent basis weight and roll winding softness of the core is more preferably 20.0 or less, and even more preferably 15.0 or less. If the product of the apparent basis weight and roll winding softness of the core is less than the above lower limit, the core may be easily crushed. Furthermore, if the product of the apparent basis weight and roll winding softness of the core exceeds the above upper limit, costs will increase, and although the core will not be crushed, the winding diameter will be larger, which may make it difficult to attach to a paper holder.

[0039] (Number of plies in kitchen towel sheet)

[0040] The kitchen towel sheet 10x according to this embodiment is a two-ply or three-ply sheet, with a two-ply sheet being preferred. If the kitchen towel sheet has four or more plies, the basis weight of each ply will be low, the wet strength agent will not adhere to the fibers, and the papermaking process will be contaminated. Furthermore, a one-ply sheet will have poor absorbency due to the lack of inter-sheet gaps.

[0041] (Basic weight) The basis weight per product ply of the kitchen towel sheet 10x according to this embodiment is 30 g / m 2 More than 59g / m 2 The minimum basis weight per product ply is 38 g / m 2 More than 40g / m 2 More preferably, the upper limit is 54 g / m 2 Less than 51 g / m 2 The following is more preferable: If the basis weight per product ply exceeds the upper limit, the roll density becomes high and the core becomes easily crushed, while if it is below the lower limit, the water absorption capacity becomes poor. The basis weight can be measured in accordance with JIS P 8124. The basis weight per product ply refers to the basis weight measured without changing (without peeling or increasing) the number of plies of the kitchen towel sheet 10x, which in this application is 2 plies or 3 plies.

[0042] (Water absorption amount) In this embodiment, the water absorption per unit area of ​​the kitchen towel sheet 10x is 300 g / m 2 More than 700g / m 2 The water absorption per unit area of ​​a 10x kitchen towel sheet is at least 390 g / m 2 More than 430g / m 2 The upper limit of the water absorption per unit area of ​​the kitchen towel sheet 10x is 600 g / m 2 Preferably less than 550 g / m 2 The following is more preferable: If the water absorption per unit area exceeds the upper limit, the basis weight becomes high and the core becomes easily crushed, whereas if it is below the lower limit, the water absorption is poor.

[0043] Furthermore, the water absorption capacity per unit mass of the kitchen towel sheet 10x is preferably 8.0 g / g or more and 15.0 g / g or less. The lower limit of the water absorption capacity is more preferably 8.5 g / g or more, and even more preferably 9.0 g / g or more. The upper limit of the water absorption capacity is more preferably 14.0 g / g or less, and even more preferably 11.3 g / g or less. If the water absorption capacity per unit mass is less than the above-mentioned lower limit, the water absorption may be poor. If the water absorption capacity per unit mass exceeds the above-mentioned upper limit, the specific volume may be high, making it difficult to attach to a paper holder.

[0044] FIG. 4 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet 10x of this embodiment.

[0045] When the kitchen towel sheet 10x is two-ply, the water absorption of each ply is preferably measured as follows. First, two plies of the kitchen towel sheet 10x are taken and cut using a square template with each ply measuring 7.6 cm to prepare rectangular test pieces 200 with sides of 7.6 cm. The mass of the test piece 200 before water absorption is measured using an electronic balance. The test piece 200 is set in a holder 220 (a jig that fixes three points of the test piece 200, made of a metal that does not absorb water).

[0046] 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 220 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 220, and as shown in Figure 4, the holder 220 and the test piece 200 are hung from a rod placed in an empty water tank, the lid of the water tank is closed, and the tank is left for 5 minutes.

[0047] 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 using an electronic balance. From the change in mass 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 mass (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.

[0048] In addition, even if the kitchen towel sheet 10x is a 3-ply, it is preferable to measure it as a 3-ply sheet using the same procedure as for the 2-ply sheet. This measurement is carried out in accordance with JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0049] (Embossed) The kitchen towel roll 10 (kitchen towel sheet 10x) of this embodiment is embossed, and preferably includes a linear embossed pattern. If the embossed pattern is dotted, it tends to be bulky, making it difficult to attach to a paper holder and making the core more susceptible to crushing.

[0050] In addition, the kitchen towel sheet 10x of the present invention is formed by laminating two or three plies after embossing at least the front ply. When laminating two plies, it is preferable to use, for example, ply bond glue to apply the glue and perform the bonding process. By bonding the two plies in this way, water absorption is increased. Furthermore, water may be used instead of ply bond glue, or glue and water may be mixed.

[0051] The embossing pattern of the kitchen towel roll 10 (kitchen towel sheet 10x) of this embodiment preferably includes radial embossing and closed-ring embossing, and the radial embossing and closed-ring embossing are alternately arranged at equal intervals. FIG. 3 shows an example of an embossing pattern in the kitchen towel roll 10 of this embodiment. By providing the embossing pattern 50 on the front surface 10a, glue can be applied to the embossed areas and the two plies can be laminated. The sheet on the back surface 10b may have an embossed pattern, but it is preferable that it not have one. By not having an embossed pattern on the back surface 10b, the kitchen towel sheet 10x (kitchen towel roll 10) can have an excellent texture.

[0052] The embossed pattern 50 includes radial embossments 51 and closed-ring structure embossments 52, and the radial embossments 51 and the closed-ring structure embossments 52 can be arranged alternately at equal intervals. If the radial embossments 51 are not included, the kitchen towel sheet 10x may have poor water absorbency. If the closed-ring structure embossments 52 are not included, the kitchen towel sheet 10x may have poor water absorbency.

[0053] Although the overall shape of the radial embossments 51 is not particularly limited, it is preferable that the embossed pattern 50 has a plurality of linear embossments extending outward from the center or linear embossments. When the embossed pattern 50 includes the radial embossments 51, water diffuses along the embossments, increasing the water absorbency of the kitchen towel sheet 10x. Like the radial embossments 51, the overall shape of the closed-ring structure embossments 52 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 50 includes the closed-ring structure embossments 52, water is retained inside the embossments, increasing the water absorbency of the kitchen towel sheet 10x.

[0054] The size of the embossed pattern 50, which includes one radial embossment 51 and one closed-ring structure embossment 52, has a lower limit of 16 cm 2 Preferably, it is 28cm or more. 2 More preferably, it is 45cm or more. 2 The upper limit is more preferably 250 cm or more. 2 Preferably less than 180cm 2 It is more preferable that it is less than 110cm 2 It is more preferable that: Embossing pattern 50 is 16cm in size 2 If the size of the embossed pattern 50 is less than 250 cm, the embossed pattern 50 will be too small, and the kitchen towel sheet 10x will have poor absorbency. 2 If it exceeds 50, the embossing pattern will be too large and the kitchen towel sheet 10x will have poor water absorbency. The size of the embossed pattern 50 is determined by calculating the area of ​​a rectangle E that includes (circumscribes) one embossed pattern 50 as shown in Fig. 3. The sizes of the long and short sides of this rectangle E can be changed as appropriate depending on the size of the embossed pattern 50 (radial embossments 51 and closed-ring structure embossments 52).

[0055] Embossed pattern 50 includes linear embossed portions 500, but it is preferable that none of linear embossed portions 500 included in embossed pattern 50 are parallel to the MD direction of kitchen towel sheet 10x. Since none of linear embossed portions 500 are parallel to the MD direction of kitchen towel sheet 10x, kitchen towel sheet 10x becomes less likely to tear.

[0056] Furthermore, the proportion of linear embossed portions 500 in the embossed pattern 50 is preferably 20% or more. If the proportion is less than 20%, the embossed pattern 50 cannot contribute to improving water absorbency, and the kitchen towel sheet 10x will have poor water absorbency. The proportion of the linear embossed portions 500 contained in the embossed pattern 50 is more preferably 50% or more, and even more preferably 90% or more.

[0057] In this case, the linear embossed portion 500 refers to an embossment having a thickness of 0.1 mm to 4 mm and a length of 5 mm or more. The proportion of the linear embossed portion 500 is determined as follows. First, any 100mm x 100mm area on the surface of the kitchen towel sheet 10x with the embossed pattern 50 is divided into 10mm squares. Then, the proportion of the linear embossed portion 500 is calculated using the following formula. Note that if a single square contains both linear embossing and dot embossing, the square with the larger embossing percentage is used. (Number of squares containing linear embossing / Number of squares containing any embossing) x 100 = Percentage of linear embossing in 500 (%)

[0058] Furthermore, there are no particular restrictions on whether the back surface 10b of the kitchen towel sheet 10x has an embossed pattern 50, as long as it has a pattern of protrusions and recesses resulting from the papermaking process that is different from the above-mentioned embossed pattern 50. Nested embossing or pin-to-pin embossing may be applied, or no embossing may be applied, but nested embossing or no embossing is preferred, and no embossing is more preferred.

[0059] (seat length) The sheet length between perforations (the length of the kitchen towel sheet 10x in the roll winding direction) is preferably 100 mm or more, more preferably 130 mm or more, and even more preferably 150 mm or more, and is preferably 250 mm or less, more preferably 230 mm or less, and even more preferably 210 mm or less.

[0060] (specific volume) The specific volume of 10x kitchen towel sheets is 7.7cm 3 / g or more 24.5cm3 The lower limit of the above range of specific volume is more preferably 9.8 cm 3 / g or more, and more preferably 11.5 cm 3 The upper limit of the above range of specific volume is more preferably 21.0 cm 3 / g or less, and more preferably 20.0 cm 3 / g or less. If the specific volume is below the lower limit, the water absorbency of the kitchen towel roll may be poor. If the specific volume is above the upper limit, the roll diameter DR may become too large, making it difficult to fit the roll into a paper holder. The specific volume is calculated by dividing the paper thickness per ply of a 10x kitchen towel sheet by the basis weight per ply, and then calculating the volume cm per g. 3 It is expressed as:

[0061] (paper thickness) The paper thickness of the 2-ply or 3-ply kitchen towel sheet 10x is 2.29 mm or more and 4.25 mm or less. The lower limit of the paper thickness per product ply is preferably 2.70 mm or more, more preferably 2.75 mm or more. The upper limit is preferably 3.75 mm or less, more preferably 3.65 mm or less. If the paper thickness exceeds the above-mentioned upper limit, the roll diameter DR becomes large, making it difficult to attach to a paper holder. If the paper thickness is below the above-mentioned lower limit, the water absorbency is poor.

[0062] The paper thickness can be measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 38 gf / cm 2 The gauge diameter is 30 mm, and the sample is placed between the gauge and the measuring table. The gauge is read when the gauge is lowered at a speed of 1 mm per second or less. The sample is 10 sheets of 10x kitchen towel sheets (5 pairs for 2-ply, 3 pairs for 3-ply, and the value is proportionally calculated to 10 pairs). The measurement is also repeated 10 times at different points, and the measurement results are averaged.

[0063] (Kitchen towel roll packaging) The kitchen towel roll 10 according to this embodiment is preferably a kitchen towel roll package in which two or three rolls are arranged side by side and packaged in film, and three rolls are more preferred. The kitchen towel roll packaging 1 is a film-packaged kitchen towel roll 10, which is made by winding up the kitchen towel sheet 10x as described above, in such a way that two or three rolls are arranged adjacent to each other with their axial directions parallel to each other.

[0064] The kitchen towel roll package 1 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing, (3) winding into a roll, and (4) wrapping two or three rolls in film.

[0065] FIG. 5 is a diagram showing a part of the papermaking process for the kitchen towel sheet 10x of the embodiment.

[0066] In this case, it is preferable that a concave-convex pattern derived from the papermaking process (fabric), different from the above-mentioned embossed pattern, is applied to the kitchen towel sheet 10x in the papermaking process. By having this concave-convex pattern, the water absorption capacity of the kitchen towel sheet 10x can be further increased.

[0067] "Derived from the papermaking process" means that, during the papermaking process for the kitchen towel sheet 10x, a concave-convex pattern is imparted between the head box 41 of the papermaking machine and the outlet of the Yankee dryer 46. Specifically, in a portion of the papermaking process shown in FIG. 5, pulp slurry 40a is sprayed (supplied) from the head box 41 between the first fabric (forming fabric) 42 and the second fabric (concave-convex fabric) 43, and is drawn onto the second fabric (concave-convex fabric) 43 by the forming roll 44, forming a wet paper web 40b. Next, the wet paper web 40b is dried together with the second fabric (concave-convex fabric) 43 in a through-air dryer 45, resulting in the formation of concave-convex patterns in the dried sheet 40c. Note that, although two through-air dryers 45 are shown in FIG. 5, a single unit may be used. Also, although a Yankee hood is depicted on the Yankee dryer 46, the hood may be omitted. Crepe may be imparted in the Yankee dryer 46.

[0068] The uneven pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the uneven pattern will change the specific volume (paper thickness), but it is preferable to select a pattern that will keep the specific volume (paper thickness) of the base paper within the aforementioned numerical range.

[0069] In addition, in the (4) film packaging, the packaging form of the packaging film 2 may be caramel packaging as shown in Fig. 1. The packaging form may also be gusset packaging (not shown).

[0070] (Caramel packaging) The three kitchen towel rolls 10 are arranged side by side with their axial directions parallel to each other, and are then wrapped in caramel wrap with the above-mentioned resin film 30. Caramel wrap is a well-known method. For example, multiple kitchen towel rolls 10 are placed on a sheet-like film 30 so that their axial directions are parallel to each other, and in this state, the film 30 is wrapped around the circumferential surface of the kitchen towel roll 10 to form a tube, and the portions where both ends of the film 30 overlap with the circumferential surface of the kitchen towel roll 10 are heat-sealed (not shown) along the axial direction (X direction). Alternatively, multiple kitchen towel rolls 10 arranged so that their axial directions are parallel to one another are raised from below the set sheet-like film 30 to the sheet surface (lower surface side) of the film 30. In this state, the film 30 is wrapped around the circumferential surface of the kitchen towel roll 10 to form a cylinder, and the overlapping portions of both ends of the film 30 on the circumferential surface of the kitchen towel roll 10 are heat-sealed (not shown) along the axial direction (X direction). Alternatively, a plurality of kitchen towel rolls 10 arranged so that their axial directions are parallel to one another are inserted in the axial direction (X direction) from one end of the opening of film 30 that has been formed into a cylindrical shape in advance. Then, of the film 30 protruding from both ends of the multiple kitchen towel rolls 10, two opposing flap-shaped edges 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. This heat-sealed area becomes the heat-sealed adhesive portion 14 shown by hatching in Figures 1 and 3.

[0071] When the packaging form is gusset packaging, there are no particular limitations on the equipment or process used, as long as they are known packaging equipment and processes capable of gusset packaging. For example, it is preferable to gusset package two or three rolls of kitchen towel rolls 10 with a polyethylene resin film 2 so that the film conforms to the surface shape of the roll product, thereby producing a two- or three-roll package (kitchen towel roll package 1). Among these, a three-roll package is more preferable. [Example]

[0072] The present invention will be explained in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples in any way.

[0073] The kitchen towel rolls and kitchen towel roll packages of Examples 1 to 13 and Comparative Examples 1 to 6 were manufactured through the following processes: (1) papermaking and creping (using TAD), (2) embossing, (3) roll winding, and (4) caramel wrapping. The kitchen towel sheets and kitchen towel rolls of all Examples and Comparative Examples were measured for various parameters according to the methods described above, and the following evaluations were also performed according to the methods described above. All embossing was performed only on the front side of the kitchen towel sheets. The embossing pattern included radial embossing and closed-ring structure embossing, and the radial embossing and closed-ring structure embossing were alternately arranged at equal intervals.

[0074] (Paper tube (core) crushed) The evaluation of cardboard core crushing was based on the resistance of the cardboard core to unintentional crushing during processing, transportation, dropping, etc. The kitchen towel roll packages were placed vertically in the axial direction, packed in a cardboard box with 12 of them lined up, and then vibrated vertically and horizontally at 1 back-and-forth per second for 1 minute each. This was done 5 times (a total of 60 rolls were evaluated). 30 monitors then visually inspected the core and each monitor evaluated its resistance to crushing, rating it on a 4-point scale based on the number of people who felt that the cardboard core was crushed. The evaluation criteria are as follows: 4: 0-2 people felt that the core was crushed 3: 3-5 people feel that the core is crushed 2: 6-10 people felt that the core was crushed 1: 11 or more people feel that the core is crushed

[0075] (Core cost) The apparent basis weight of the paper core of the kitchen towel roll was measured and evaluated on a four-point scale according to the following criteria: 4: 450g / m 2 below 3: 450g / m 2 Over 520g / m 2 The following is the result. 2: 520 g / m 2 Over 650g / m 2 The following is the result. 1:650g / m 2 exceed

[0076] (Water absorption) The "water absorbency" was evaluated by measuring the amount of water absorbed (product ply, per unit area) and rating it on a four-point scale. The evaluation criteria are as follows: 4: 430 g / m 2 That was all. 3: 390 g / m 2 More than 430g / m 2 It was less than. 2: 300g / m 2 More than 390g / m 2 It was less than. 1:300g / m 2 It was less than.

[0077] (Ease of attaching the paper holder) Thirty test subjects each attached a kitchen towel roll to a paper holder. Each test subject evaluated the ease of attachment, rating it on a four-point scale based on the number of test subjects who felt it was "difficult to attach." The evaluation criteria were as follows: 4: 0-2 people found it difficult to put on 3: 3-5 people found it difficult to put on 2: 6-10 people found it difficult to put on 1: 11 or more people found it difficult to put on

[0078] The results obtained are shown in Tables 1 and 2.

[0079] [Table 1]

[0080] [Table 2]

[0081] From the above, it was confirmed that the kitchen towel roll of this example has excellent water absorption, a roll density within a certain range that makes it easy to attach to a paper holder, a core cost within a certain range, and a core that is not easily crushed. [Explanation of symbols]

[0082] 1. Kitchen towel roll packaging 2 Resin film 10 kitchen towel rolls 10a surface 10b back side 10e The outermost edge of a kitchen towel roll 10x kitchen towel sheets 11 Top 12 Bottom 13 Side 14 Heat seal adhesive part 15 perforations 20 paper core 40a Pulp Slurry 40b wet paper 40c dry sheet 41 Headbox 42 First Fabric (Forming Fabric) 43 Second fabric (convex and concave fabric) 44 Forming roll 45 Through Air Dryer 46 Yankee Dryer 200 specimens 220 Holder 50 embossed patterns 51 Radial Embossing 52 Closed ring structure embossing 500 Linear embossed area

Claims

1. A kitchen towel roll is formed by winding up a kitchen towel sheet in a roll, the kitchen towel sheet being formed by laminating two or three plies of sheets having an embossed pattern thereon, The basis weight of the kitchen towel sheet is 30 g / m ２ More than 59g / m ２ The paper thickness is 2.29 mm or more and 4.25 mm or less, and the water absorption is 300 g / m ２ 700g / m or more ２ is as follows: The roll diameter of the kitchen towel roll is 130 mm or more and 170 mm or less, and the roll density is 0.050 g / cm ３ 0.120g / cm or more ３ Hereinafter, the apparent basis weight of the paper tube is 250 g / m ２ 650g / m or more ２ The following refers to a kitchen towel roll having a roll winding softness of 1.2 mm or more and 4.2 mm or less.

2. The winding density of the kitchen towel roll is 0.20 m / cm ２ 0.56m / cm or more ２ 2. The kitchen towel roll of claim 1, wherein:

3. 2. The kitchen towel roll according to claim 1, wherein the water absorption per unit mass of the kitchen towel sheet is 8.0 g / g or more and 15.0 g / g or less.

4. 2. The kitchen towel roll of claim 1, wherein the embossed pattern comprises a linear embossed pattern.

5. 2. The kitchen towel roll according to claim 1, wherein the paper tube contains a total of 50% or more of softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP), and the LBKP content of the NBKP and the LBKP is 50% or more.

6. 5. The kitchen towel roll of claim 4, wherein the embossing pattern includes radial embossments and closed-ring structure embossments, and the radial embossments and the closed-ring structure embossments are alternately arranged at equal intervals.

7. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a wet pulp content of 50% or more.

8. 2. The kitchen towel roll according to claim 1, wherein the content ratio of softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP) in the kitchen towel sheet is 40% to 100%:60% to 0%.

9. 2. The kitchen towel roll according to claim 1, wherein the roll mass of the kitchen towel roll is 170 g or more and 550 g or less.

10. 2. The kitchen towel roll according to claim 1, wherein the paper core of the kitchen towel roll has a mass of 10 g or more and 25 g or less.

11. 2. The kitchen towel roll according to claim 1, wherein the roll length is 18 m or more and 45 m or less.

12. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a sheet width of 260 mm or more and 300 mm or less.

13. 2. The kitchen towel roll according to claim 1, wherein the outer diameter of the paper core of the kitchen towel roll is 20 mm or more and 60 mm or less.

14. The specific volume of the kitchen towel sheet is 7.7 cm ３ / g or more 24.5cm ３ 10. The kitchen towel roll of claim 1, wherein the surface roughness is 0.1 / g or less.

15. 2. The kitchen towel roll according to claim 1, wherein the product of the apparent basis weight of the paper core and the roll winding softness is 5.0 or more and 25.0 or less.

16. A kitchen towel roll package comprising two or three rolls of the kitchen towel roll according to claim 1 arranged side by side and packaged in a film.

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