Kitchen towel roll and method of producing the same

Abstract

To provide a kitchen towel roll of good water absorbency and excellent wet strength, and good operability resulting from it that a paper making process is hardly contaminated, whose cost can be suppressed by maintaining a basis weight, and to provide a method of producing the same.SOLUTION: In a kitchen towel roll formed by rolling up kitchen towel sheets applied with an embossed pattern of two ply or three ply lamination, the basis weight of the kitchen towel sheet is 30 g / m2 or more and 54 g / m2 or less, a water absorption per unit area of the kitchen towel sheet is 320 g / m2 or more and 520 g / m2 or less, the wet cross direction tensile strength (WCDT) of the kitchen towel sheet is 190 cN / 25 mm or more and 410 cN / 25 mm or less, and the ratio of the wet machine direction tensile strength (WMDT) relative to the wet cross direction tensile strength (WCDT) is 0.9 or more and 1.5 or less. A method of producing the kitchen towel roll is disclosed herein.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a kitchen towel roll and a method for making the same. [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] As a technology relating to papermaking technology using through-air drying, Patent Document 1 discloses an uncreped through-air dried tissue sheet having about 10 to about 150 protrusions per 6.45 square centimeters (1 square inch) with a height of about 0.012 millimeters (0.005 inches) or more, a cross-machine direction elongation rate of about 9 percent or more, and a basis weight of about 10 to 70 grams per square meter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3758702 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 tend to have low strength when wet due to the high moisture content of the sheets. Since the strength in the transverse direction is particularly low compared to the strength in the longitudinal direction, it is necessary to increase the strength in the transverse direction. While the strength in the transverse direction can be adjusted to some extent by the JW (jet wire) ratio, there is a limit to how much strength can be achieved. Increasing the amount of wet strength agent added can increase the strength in both the longitudinal and transverse directions when wet. However, as the amount of wet strength agent added increases, the adhesion of the wet strength agent to the fibers deteriorates, resulting in problems with soiling and operational efficiency during the papermaking process. On the other hand, if the amount added is too low, the wet strength agent is used to consume anionic trash, resulting in insufficient adhesion to the fibers and preventing the desired strength from being achieved. Increasing the basis weight improves wet strength, but at the expense of increased cost. Thus, it is difficult to achieve kitchen towel sheets with excellent water absorption obtained using TAD papermaking technology that have sufficient wet strength and good operational efficiency at low cost.

[0006] Therefore, an object of the present invention is to provide a kitchen towel roll that has good water absorbency and excellent wet strength, is less likely to be soiled during the papermaking process, thereby improving operability, and can reduce costs by maintaining the basis weight, as well as a method for manufacturing the same. [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 adjusting the number of layers of kitchen towel sheets, basis weight, water absorption per unit area, lateral tensile strength when wet, and the ratio of longitudinal tensile strength when wet to the lateral tensile strength when wet within specified ranges, leading to the completion of the present invention.

[0008] (1) A 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 thereon, The kitchen towel sheet has a basis weight of 30 g / m 2 More than 54g / m 2 Below, the water absorption per unit area is 320g / m 2 More than 520g / m 2 is as follows: The kitchen towel roll is characterized in that the wet cross tensile strength (WCDT) of the kitchen towel sheet is 190 cN / 25 mm or more and 410 cN / 25 mm or less, and the ratio of the wet machine direction tensile strength (WMDT) to the wet cross tensile strength (WCDT) (WMDT / WCDT) is 0.9 or more and 1.5 or less. (2) A second aspect of the present invention is the kitchen towel roll according to (1), characterized in that the kitchen towel sheet has a water absorption per unit weight of 8 g / g or more. (3) The third aspect of the present invention is a kitchen towel roll according to (1), characterized in that the ratio of the wet cross direction tensile strength (WCDT) to the dry cross direction tensile strength (DCDT) of the kitchen towel sheet ((WCDT / DCDT) x 100(%)) is 19% or more and 43% or less. (4) A fourth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the content of the wet strength agent in the kitchen towel sheet is 0.2% by mass or more and 1.9% by mass or less. (5) A fifth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the kitchen towel sheet has a concavo-convex pattern derived from the papermaking process, which is different from the embossed pattern. (6) A sixth aspect of the present invention is a method for producing a kitchen towel roll according to (1), The cation demand of the pulp slurry after addition of the wet strength agent is 20 μeq / L or more and 200 μeq / L or less. (7) A seventh aspect of the present invention is a method for producing a kitchen towel roll according to (1), The cationic demand at the stock inlet is 5 μeq / L or more and 50 μeq / L or less. (8) An eighth aspect of the present invention is a method for producing a kitchen towel roll according to (1), The blending amount of wet pulp in the pulp used as raw material is 50% by mass or more and 100% by mass or less. (9) A ninth aspect of the present invention is a method for producing a kitchen towel roll according to (1), It is characterized by being made using a TAD paper machine. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a kitchen towel roll and a method for manufacturing the same that have good water absorbency and excellent wet strength, are less likely to be soiled during the papermaking process, thereby improving operability, and can reduce costs by maintaining the basis weight. [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] FIG. 2 is a diagram showing an example of an embossing pattern in the kitchen towel roll of the present embodiment. [Figure 4] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 5] FIG. 1 is a graph showing a height profile on the XY plane obtained by a microscope. [Figure 6] FIG. 10 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 7]FIG. 2 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the present embodiment. [Figure 8] 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."

[0013] An embodiment of the present invention is a kitchen towel roll 10 and a method for manufacturing the same, which is formed by rolling up a kitchen towel sheet 10x made by laminating two or three plies of base paper made using a papermaking machine and imparting an embossed pattern to the base paper. The kitchen towel roll 10 and its manufacturing method 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, other papermaking chemicals are appropriately mixed in a process (tank) called a chest or seed box 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, the dryer section is a TAD. 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 used. 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 a paper tube 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, 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 the paper tube (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 amount of wet pulp in the pulp used as a raw material is 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%. The lower limit of the above range of the amount of wet pulp (solid content mass %) is preferably 65% ​​by mass or more, and more preferably 80% by mass or more. If the amount of wet pulp is less than 50% by mass, the wet strength of the kitchen towel sheet 10x may be reduced.

[0016] Pulp used as a raw material may be, for example, softwood bleached kraft pulp (NBKP) or hardwood bleached kraft pulp (LBKP). The blending ratio is preferably NBKP:LBKP = 35-75% by mass:65-25% by mass, more preferably NBKP:LBKP = 40-70% by mass:60-30% by mass, and even more preferably NBKP:LBKP = 45-65% by mass:55-35% by mass. If the NBKP blending ratio exceeds 75% by mass or if the LBKP blending ratio is less than 25% by mass, costs may increase. If the NBKP blending ratio is less than 35% by mass or if the LBKP blending ratio is more than 65% by mass, wet strength may decrease.

[0017] (wet strength agent) The wet strength agent is not particularly limited, but a polyamide polyamine epichlorohydrin-based agent can be used, for example, polyamide epichlorohydrin (PAE). A dry strength agent may also be used in combination, and a polyacrylamide-based dry strength agent can be used. Since the wet strength agent is cationic (cation-rich), it is preferable that the dry strength agent be anionic (anion-rich). When the dry strength agent is anionic, the wet strength agent and the dry strength agent are better fixed to the fibers. The wet strength agent is preferably added in a process before the seed box or fan pump (a pump that supplies pulp slurry from the pulper to the head box. Generally, the pulp slurry and white water are mixed and then supplied to the head box) and is added when the pulp slurry has a concentration of 1.5% to 5.0% by mass, preferably 2.0% to 4.5% by mass, and more preferably 2.5% to 4.0% by mass. Furthermore, the wet strength agent and dry strength agent are preferably added in this order to strengthen adhesion to the pulp fibers.

[0018] (cation demand of pulp slurry) In this embodiment, the cationic demand of the pulp slurry after the addition of the wet strength agent is preferably 20 μeq / L or more and 200 μeq / L or less. The cationic demand of the pulp slurry after the addition of the wet strength agent refers to the cationic demand of the pulp slurry at the location where the wet strength agent is added. The cationic demand of a pulp slurry is measured as follows: First, 100 g of the pulp slurry after adding the wet strength agent is sampled and suction filtered using Whatman ashless quantitative filter paper (grade 41), and the filtrate is collected. Next, the cationic demand is measured using a particle charge analyzer (Muteck PCD-02) based on the amount of 1 / 1000N polydiallyldimethylammonium chloride aqueous solution required to neutralize the charge of 10 ml of the filtrate. This measurement is performed five times, and the values ​​are averaged.

[0019] If the cationic demand of the pulp slurry after adding the wet strength agent is less than 20 μeq / L, the wet strength agent is added in excess, and the wet strength agent that does not adhere to the fibers may contaminate the papermaking process.On the other hand, if the cationic demand of the pulp slurry after adding the wet strength agent is more than 200 μeq / L, the wet strength agent is not added sufficiently, and the wet strength agent does not adhere to the fibers well, resulting in low wet strength. The lower limit of the cationic demand of the pulp slurry after the addition of the wet strength agent is preferably 30 μeq / L or more, more preferably 40 μeq / L or more. The upper limit of the cationic demand of the pulp slurry after the addition of the wet strength agent is preferably 100 μeq / L or less, more preferably 70 μeq / L or less. The cationic demand can be adjusted by the amount of fresh water used in the papermaking system (preparation process, papermaking process) and the content of recycled paper pulp derived from milk cartons. It can also be adjusted by adding known papermaking chemicals such as coagulants, fixing agents, and aluminum sulfate.

[0020] (Cation demand at stock inlet) In this embodiment, the cationic demand at the stock inlet is preferably 5 μeq / L or more and 50 μeq / L or less. If the cationic demand at the stock inlet is less than 5 μeq / L, the addition of the wet strength agent may be excessive, the wet strength agent may not adhere to the fibers, and the papermaking process may become dirty. On the other hand, if the cationic demand at the stock inlet is more than 50 μeq / L, the addition of the wet strength agent may be insufficient, the wet strength agent may not adhere to the fibers, and the wet strength may be low. The lower limit of the cationic demand at the stock inlet is more preferably 8 μeq / L or more, even more preferably 10 μeq / L or more, and the upper limit of the cationic demand is more preferably 38 μeq / L or less, even more preferably 30 μeq / L or less.

[0021] (Wet strength agent added amount) In this embodiment, the amount of solids added to the wet strength agent during production is preferably 0.4% by mass or more and 3.0% by mass or less relative to the mass of the total solids in the paper stock. If the amount of the wet strength agent added during production is less than 0.4% by mass, the amount of the wet strength agent added is insufficient, which may result in weak adhesion of the wet strength agent to the fine fibers and low wet strength. If the amount of the wet strength agent added during production exceeds 3.0% by mass, the addition is excessive, and the wet strength agent that does not adhere to the fibers may contaminate the papermaking process. The lower limit of the amount of the wet strength agent added during production is more preferably 0.7% by mass or more, and even more preferably 0.8% by mass or more. The upper limit of the amount of the wet strength agent added during production is more preferably 2.2% by mass or less, and even more preferably 1.5% by mass or less.

[0022] (First Pass Retention) The first pass retention (FPR) when the stock is ejected from the inlet onto the wire is preferably 40% or more and 93% or less. First pass retention is the percentage of stock that accumulates on the wire, and is calculated as follows: First pass retention = {1 - (stock concentration (mass%) in the white water dewatered by the wire) / (stock concentration (mass%) in the inlet)} x 100. For example, if the stock concentration at the stock inlet (the total concentration of the papermaking raw materials (pulp) and other solid papermaking chemicals in the stock) is 0.8% by mass, and the stock concentration in the white water dewatered by the wire is 0.3% by mass, then FPR = (0.8% - 0.3%) / 0.8% x 100 = {1 - (0.3% / 0.8%)} x 100 = 63%. In other words, 63% of the raw material will become paper, and 37% will return to the raw material without becoming paper. If the FPR is less than 40%, the yield of the fibers and the wet strength agent fixed to the fibers will be low, causing contamination during the papermaking process. On the other hand, if the FPR is more than 93%, the paper will have poor formation, the basis weight will fluctuate greatly, and the wet strength may be low. The lower limit of the FPR is more preferably 45% or more, and even more preferably 50% or more, and the upper limit of the FPR is more preferably 82% or less, and even more preferably 75% or less.

[0023] <Kitchen towel roll> FIG. 2 is a perspective view of the kitchen towel roll 10 according to this embodiment.

[0024] 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).

[0025] 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.

[0026] 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.

[0027] (winding length and winding diameter) The lower limit of the roll length of the kitchen towel roll 10 is preferably 18 m or more, more preferably 20 m or more, and even more preferably 24 m or more. The upper limit is preferably 45 m or less, more preferably 40 m or less, and even more preferably 35 m or less. If the roll length is less than the above-mentioned lower limit, the basis weight may be high and the cost may be poor when a constant roll diameter DR is achieved. On the other hand, if the roll length exceeds the above-mentioned upper limit, the basis weight may be low and the water absorbency may be poor when a constant roll diameter DR is achieved.

[0028] 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.

[0029] The lower limit of the roll diameter DR of the kitchen towel roll 10 according to this embodiment is preferably 127 mm or more, more preferably 135 mm or more, and even more preferably 140 mm or more. The upper limit is preferably 175 mm or less, more preferably 165 mm or less, and even more preferably 157 mm or less. If the roll diameter DR exceeds the upper limit, the basis weight may increase and the cost may be lower for a given roll length. If the roll diameter DR is less than the lower limit, the basis weight may decrease and the water absorbency may be lower for a given roll length.

[0030] 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.

[0031] (roll width and roll weight) The roll width of the kitchen towel roll 10 is preferably 150 mm or more at the lower limit, more preferably 200 mm or more, and even more preferably 250 mm or more at the upper limit. The roll width is preferably 380 mm or less, more preferably 340 mm or less, and even more preferably 300 mm or less. If the roll width exceeds the upper limit, the amount of water absorbed may be greater than necessary, making it difficult to use as a kitchen towel sheet. On the other hand, if the roll width is less than the lower limit, the water absorbency may be poor and it may be difficult to use as a kitchen towel sheet.

[0032] The roll weight of the kitchen towel roll 10 is preferably 200 g or more at the lower limit, more preferably 240 g or more, and even more preferably 260 g or more at the upper limit. The roll weight is preferably 550 g or less, more preferably 490 g or less, and even more preferably 450 g or less. If the roll weight is below the above-mentioned lower limit, the basis weight will be low and the water absorbency may be poor. On the other hand, if the roll weight exceeds the above-mentioned upper limit, the basis weight will be high and the cost may be poor.

[0033] The roll weight is the weight per 280 mm of roll width, not including the core (paper tube 20) of the kitchen towel roll 10. If the roll width is not 280 mm, it is converted to the weight per 280 mm by proportional calculation.

[0034] (roll density) The roll density of the kitchen towel roll 10 according to this embodiment preferably has a lower limit of 0.04 g / cm 3 More preferably, it is 0.05 g / cm or more. 3 More preferably, it is 0.06 g / cm 3 The upper limit of the roll density is preferably 0.13 g / cm 3 or less, more preferably 0.10 g / cm 3 More preferably, it is 0.09 g / cm or less. 3 If the roll density is below the lower limit, the basis weight will be low, the FPR will be low, and the papermaking process may become dirty. If the roll density is above the upper limit, the basis weight will be high, and the cost may be poor.

[0035] Roll density is expressed as (roll weight) ÷ (roll volume). Roll weight is the weight of the kitchen towel roll 10 per 280 mm of roll width. 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 weight (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, 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:

[0036] (winding density) The winding density of the kitchen towel roll 10 according to this embodiment is preferably 0.20 m / cm 2 More preferably, it is 0.24 m / cm or more. 2 More preferably, it is 0.30 m / cm 2 The upper limit is preferably 0.56 m / cm 2 or less, more preferably 0.50 m / cm 2 More preferably, it is 0.45 m / cm or less. 2 If the winding density is below the lower limit, the basis weight will be high and the cost may be low. If the winding density is above the upper limit, the basis weight will be low, which may lead to contamination during the papermaking process.

[0037] 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:

[0038] (Paper tube) The kitchen towel roll 10 preferably has a paper tube 20 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 be, for example, a roughly cylindrical tube in cross section. The paper tube 20 is made of multiple layers of base paper, and preferably two layers. The paper tube 20 preferably contains LBKP (bleached hardwood kraft pulp) as the pulp fiber contained in the base paper. The LBKP content is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more. By including LBKP in the paper tube 20, the paper tube 20 becomes smooth, making it easier to operate when winding a sheet that has unevenness due to the paper machine. As a result, yield is improved and manufacturing costs are reduced.

[0039] (Paper tube outer diameter) The cardboard tube outer diameter DI, which is the outer diameter of the cardboard tube 20 that forms the core of the kitchen towel roll 10, has a lower limit of preferably 28 mm or more, more preferably 33 mm or more, and even more preferably 40 mm or more. The upper limit is preferably 58 mm or less, more preferably 53 mm or less, and even more preferably 46 mm or less. If the cardboard tube outer diameter DI is less than the above-mentioned lower limit or exceeds the above-mentioned upper limit, it may be difficult to use.

[0040] The outer diameter DI of the paper tube is measured, for example, using a diameter ruler manufactured by Muratec KDS Co., Ltd. Preferably, the measurement is performed on three kitchen towel rolls 10 and the measurement results are averaged.

[0041] (Number of plies in kitchen towel sheet)

[0042] 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.

[0043] (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 54g / m 2 The basis weight per product ply is 54 g / m 2 Above 30g / m the cost of the basis weight is poor. 2If it is less than this, the absorbency will be poor. The minimum basis weight per ply of the product is 36 g / m. 2 More than 38g / m 2 More preferably, the upper limit is 48 g / m 2 Less than 45 g / m 2 The following is more preferred: Basis weight can be measured based on JIS P 8124. Basis weight per product ply refers to the basis weight measured without changing (without peeling or increasing) the number of plies of a 10x kitchen towel sheet.

[0044] (Water absorption amount) In this embodiment, the water absorption per unit area of ​​the kitchen towel sheet 10x is 320 g / m 2 More than 520g / m 2 The water absorption per unit area is 520g / m 2 Above 320 g / m, it is inferior in terms of basis weight cost. 2 If it is less than this, the water absorption capacity will be poor. The lower limit of the water absorption capacity per unit area of ​​a kitchen towel sheet 10x is 370 g / m 2 More than 400g / m 2 More preferably, the upper limit is 470 g / m 2 Preferably less than 450 g / m 2 The following is more preferred:

[0045] The water absorption per unit weight of the kitchen towel sheet 10x is preferably 8.0 g / g or more. If the water absorption per unit weight is less than the lower limit mentioned above, the water absorption per unit area (g / m 2 To ensure this, the basis weight must be increased, which may result in lower costs. The lower limit of the water absorption per unit weight of the kitchen towel sheet 10x is preferably 8.5 g / g or more, and even more preferably 9 g / g or more. The upper limit is preferably 14 g / g or less, and even more preferably 13 g / g or less.

[0046] FIG. 7 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet 10x of this embodiment.

[0047] When the kitchen towel sheet 10x is two-ply, the water absorption of each ply is preferably measured as follows. First, a two-ply kitchen towel sheet 10x is taken and cut using a square template with each piece measuring 7.6 cm (3 inches) to prepare a rectangular test piece 200 with each side measuring 7.6 cm. The weight 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, and the jig is made of a metal that does not absorb water).

[0048] 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 and holder 220 are removed from the distilled water, and as shown in FIG. 7, a strip 210 is attached to one corner 200d of the test piece 200. The strip 210 is made by peeling the same two-ply kitchen towel as the kitchen towel to be measured into one ply, cutting this paper kitchen towel into a piece measuring 2 mm x 15 mm, and attaching it to a portion of the test piece 200 6 mm from the corner 200d toward the center. Next, the holder 220 and test piece 200 are hung from a rod placed in an empty water tank with the corner 200a opposite corner 200d facing up, and the tank lid is closed and left for 15 minutes.

[0049] 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 weight of the test piece 200 is measured using an electronic balance. From the change in weight of the test piece 200 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 200 (g of water / sheet m 2 , 1m 2 Hit. Abbreviated as g / m 2 ) is calculated. Furthermore, the water absorption per unit area (g of water / sheet m 2 ) by the basis weight of the product ply of the test piece 200 to obtain the water absorption per unit area (water g / sheet m 2 ) / basis weight (sheet g / sheet m 2) = Water absorption per unit weight (g of water / g of sheet, per 1g. Abbreviated as g / g). Measurements are carried out five times for each sample, and the average value is used.

[0050] When the kitchen towel sheet 10x is a 3-ply sheet, it is preferable to measure it in the same manner as when it is a 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.

[0051] (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of the kitchen towel sheet 10x according to JIS P 8113 is preferably 700 cN / 25 mm or more, more preferably 800 cN / 25 mm or more, and even more preferably 900 cN / 25 mm or more, and the upper limit is preferably 1300 cN / 25 mm or less, more preferably 1200 cN / 25 mm or less, and even more preferably 1100 cN / 25 mm or less.

[0052] The dry cross direction tensile strength (DCDT) of the kitchen towel sheet 10x according to JIS P 8113 is preferably 600 cN / 25 mm or more, more preferably 800 cN / 25 mm or more, and even more preferably 850 cN / 25 mm or more. The upper limit is preferably 1200 cN / 25 mm or less, more preferably 1100 cN / 25 mm or less, and even more preferably 1050 cN / 25 mm or less. In this case, the cross direction refers to the CD direction (roll width direction).

[0053] If the DMDT or DCDT is below the lower limit, the dry strength and wet strength may be poor. On the other hand, if the DMDT or DCDT is above the upper limit, the cost per basis weight may be poor. The DMDT and DCDT of the base paper for kitchen towel rolls are measured in accordance with JIS P 8113.

[0054] (WMDT) The wet machine direction tensile strength (WMDT) of a 10x kitchen towel sheet, measured according to the former JIS S 3104, is preferably 230 cN / 25 mm or more, more preferably 280 cN / 25 mm or more, and even more preferably 300 cN / 25 mm or more. The upper limit is preferably 450 cN / 25 mm or less, more preferably 400 cN / 25 mm or less, and even more preferably 360 cN / 25 mm or less. If the WMDT is less than the above-mentioned lower limit, the dry strength and wet strength may be poor. On the other hand, if the WMDT exceeds the above-mentioned upper limit, the cost per basis weight may be poor.

[0055] (WCDT) The wet cross direction tensile strength (WCDT) is 190 cN / 25 mm or more and 410 cN / 25 mm or less. If the WCDT exceeds 410 cN / 25 mm, the cost per basis weight is poor, and if it is less than 190 cN / 25 mm, the dry strength and wet strength are poor. The lower limit of the WCDT is preferably 250 cN / 25 mm or more, and more preferably 280 cN / 25 mm or more. The upper limit is preferably 360 cN / 25 mm or less, and more preferably 330 cN / 25 mm or less.

[0056] (WMDT / WCDT) The ratio of the wet machine direction tensile strength (WMDT) to the wet cross direction tensile strength (WCDT) (WMDT / WCDT) is 0.9 or more and 1.5 or less. If WMDT / WCDT is less than 0.9, the WCDT will be high, which may make operation difficult. Furthermore, the WMDT will be low, which may result in low wet strength in the MD direction. If WMDT / WCDT exceeds 1.5, the WCDT will be low, which may result in poor wet strength. The lower limit of WMDT / WCDT is preferably 1.0 or more. The upper limit is preferably 1.3 or less, and more preferably 1.2 or less.

[0057] (WCDT / DCDT) The ratio of the wet cross-direction tensile strength (WCDT) to the dry cross-direction tensile strength (DCDT) (WCDT / DCDT × 100) is preferably 19% or more and 43% or less. The lower limit of WCDT / DCDT × 100 is more preferably 27% or more, and even more preferably 30% or more. The upper limit of WCDT / DCDT × 100 is more preferably 38% or less, and even more preferably 35% or less. If the value of WCDT / DCDT × 100 exceeds 43%, the amount of wet strength agent added is too high, making it difficult for the wet strength agent to adhere to the fibers, which may result in contamination during the papermaking process. If the value of WCDT / DCDT × 100 is less than 19%, the amount of wet strength agent added is too low, and wet strength may be poor.

[0058] (Wet strength agent content) The wet strength agent content of the kitchen towel sheet 10x according to this embodiment is preferably 0.2% by mass or more and 1.9% by mass or less. The wet strength agent content is calculated by using the bone-dry mass of the kitchen towel sheet 10x per unit area as the denominator and the mass of the solids of the wet strength agent contained in the bone-dry kitchen towel sheet 10x per unit area as the numerator. The lower limit of the wet strength agent content of the kitchen towel sheet 10x is more preferably 0.5% by mass or more, and even more preferably 0.6% by mass or more. The upper limit of the wet strength agent content of the kitchen towel sheet 10x is more preferably 1.4% by mass or less, and even more preferably 1.2% by mass or less. If the content of the wet strength agent in the kitchen towel sheet 10x is less than the above-mentioned lower limit, the wet strength may be poor. If the content of the wet strength agent in the kitchen towel sheet 10x exceeds the above-mentioned upper limit, the amount of wet strength agent added may be too high, making it difficult for the wet strength agent to adhere to the fibers and causing contamination during the papermaking process.

[0059] (Wet strength agent content / wet strength agent added amount) In this embodiment, the percentage ratio of the wet strength agent content in the kitchen towel sheet 10x to the amount of wet strength agent added during production (wet strength agent content / wet strength agent added amount x 100) is preferably 56% or more, more preferably 65% ​​or more, and even more preferably 75% or more. When the value of wet strength agent content / wet strength agent added amount x 100 is 56% or more, the added wet strength agent is efficiently fixed to the fibers, resulting in high wet strength and less contamination during the papermaking process. When the percentage ratio of the wet strength agent content in the kitchen towel sheet 10x to the amount of wet strength agent added during production is less than 56%, the wet strength is poor and the wet strength agent is less likely to fix to the fibers, which may result in contamination during the papermaking process.

[0060] (embossed pattern) The kitchen towel roll 10 (kitchen towel sheet 10x) of this embodiment can be embossed to have an embossed pattern (an embossed pattern can be applied). The kitchen towel sheet 10x can be laminated after the embossing process. For lamination, for example, plybond glue can be used to apply the glue and perform the bonding process. Water can also be used instead of plybond glue.

[0061] The plybond glue can be applied to the backside of the embossed portion of the sheet on the front surface 10a of the two-ply kitchen towel sheet 10x (between the sheet on the front surface 10a and the sheet on the back surface 10b of the two-ply), and then the two sheets can be laminated together. In the case of a three-ply kitchen towel sheet, it is possible to emboss two layers on the front surface 10a and apply glue to the backside of the middle layer, or to emboss one layer on the front surface 10a and apply glue to the backside of the layer on the front surface 10a. Of these, it is preferable to emboss two layers on the front surface 10a and apply glue to the backside of the middle layer.

[0062] The ply on the front surface 10a of the kitchen towel sheet 10x may have an embossed pattern. By providing an embossed pattern on the front surface 10a, glue can be applied to the embossed portion and two or more plies can be laminated. The sheet on the back surface 10b may have (or have) an embossed pattern, but it is preferable that it not have (or have). By not having an embossed pattern on the back surface 10b, the kitchen towel sheet 10x (kitchen towel roll 10) can be made more resistant to crushing. The embossed pattern is not particularly limited as long as it is a pattern commonly used on kitchen towels, such as a dotted or linear pattern, but a linear embossed pattern is particularly preferred. A linear embossed pattern reduces damage to the fibers and makes it less likely that the wet strength will decrease even if an embossed pattern is provided.

[0063] FIG. 3 is a diagram showing an example of an embossing pattern on a kitchen towel roll according to an embodiment.

[0064] The linear embossing pattern is not particularly limited, but a pattern such as that shown in Fig. 3 is preferred. Specifically, one pattern may include two of two types of figures: a roughly circular figure with another design inside, and a figure that is roughly line-symmetrical (may have a tilt) in the vertical and horizontal directions as a whole and includes a combination of multiple curves and figures, but the shape of the figures is not particularly limited. For the roughly circular figure, it is preferred that the roughly circular figure be doubled.

[0065] Furthermore, with regard to the dimensions of the embossed pattern, it is preferable that the rectangle E (E is not the embossed pattern) surrounding the embossed pattern be a square with sides of 2 cm to 25 cm. The lower limit of the above range for rectangle E is more preferably a square with sides of 5 cm or more, and even more preferably a square with sides of 8 cm or more. The upper limit of the above range for rectangle E is more preferably a square with sides of 20 cm or less, and even more preferably a square with sides of 15 cm or less. The vertical direction of rectangle E is preferably parallel to the winding direction of kitchen towel roll 10, and the horizontal direction is preferably parallel to the width direction of kitchen towel roll 10, although they may be tilted. By using such a pattern, the water absorption capacity of a highly absorbent kitchen towel sheet 10x can be further improved.

[0066] In this case, for embossments in a linear embossing pattern that are 0.1 mm or more and 4 mm or less in thickness and 5 mm or more in length, the total length when adding the lengths of the embossments is preferably 50 cm / 100 cm. 2 More preferably, 80cm / 100cm 2 More preferably, it is 110cm / 100cm. 2 The upper limit is preferably 550 cm / 100 cm. 2 or less, more preferably 410cm / 100cm 2 More preferably, it is 300cm / 100cm or less. 2 The total length is measured by adding up the lengths of all embossments with a thickness of 0.1 to 4 mm and a length of 5 mm or more inside a rectangle E that includes all of one embossment pattern, as shown in Figure 3. And, 100 cm 2 The total length per square is calculated. The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. If the rectangle that contains all the embossed patterns contains an embossed pattern adjacent to an embossed pattern contained within the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length.

[0067] Furthermore, if the size of one side of the rectangle E cannot be clearly determined by the embossing pattern, the size of the rectangle E is set to 10 x 10 cm, and the total length of the embossments included in this rectangle E is measured. By setting the total length within the above-mentioned range, the water absorption capacity of the highly absorbent kitchen towel sheet 10x of this embodiment can be further improved. In addition, damage to the fibers is reduced, and the wet strength is less likely to decrease even when an embossing pattern is provided. The total length is determined by actual measurement using the method described above, but it may also be measured using a general microscope.

[0068] In the embossing pattern, the lower limit of the embossing depth is preferably 0.06 mm or more, more preferably 0.10 mm or more, and even more preferably 0.14 mm or more, and the upper limit is preferably 1.05 mm or less, more preferably 0.55 mm or less, and even more preferably 0.35 mm or less.

[0069] The depth of the embossment is measured, for example, using a microscope. A microscope such as the KEYENCE One-Shot 3D Measuring Macroscope VR-3100 can be used. Software such as the VR-H1A can be used for observing, measuring, and analyzing microscope images. Measurement conditions are a magnification of 25x and a field of view of 12mm x 9mm. The measurement magnification and field of view can be changed as needed depending on the desired size of the embossment.

[0070] FIG. 4 is a diagram showing the height profile on the XY plane as measured by a microscope using shading, FIG. 5 is a diagram showing the height profile on the XY plane as measured by a microscope using a graph, and FIG. 6 is a diagram showing how to determine the embossing depth for an embossing pattern.

[0071] Figure 4 shows a height profile on the XY plane taken with a microscope, with the height of the surface of the kitchen towel sheet 10x represented by shading. The linear areas in Figure 4 that are shading different from the surrounding area represent individual embossments. The depth of the embossment is determined by measuring the height difference of the embossment using the microscope.

[0072] The measurement is preferably performed on the surface 10a side of the kitchen towel sheet 10x. Furthermore, when measuring, three turns of the kitchen towel sheet 10x are removed from the kitchen towel roll 10, and the fourth turn of the kitchen towel sheet 10x is used to measure the sheet without changing the number of plies. If there are any perforations, these are avoided during the measurement.

[0073] First, a line segment AB is drawn as shown in Figure 4, and the height profile shown in Figure 5 is obtained. Note that the line segment AB should be drawn so that it crosses the embossments. The line segment AB is drawn in the roll width direction (CD direction) of the kitchen towel sheet 10x. However, if the spacing between embossments is narrow, for example, 2 mm or less, and the height of the convex portions described below becomes low, the line segment may be drawn diagonally or in the roll winding direction R.

[0074] The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sample surface of the kitchen towel sheet 10x. However, the (measured) cross-sectional curve S also contains noise (steep peaks due to fiber clumps, whisker-like fibers, and fiber-free areas on the surface of the kitchen towel sheet 10x). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0075] Therefore, the (measured) profile curve S in Figure 5 is smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the profile curve W in Figure 6. Note that smoothing using the filter of the weighted average radio button can be obtained automatically using the analysis software mentioned above. Then, in the graph shown in Figure 6, the average of the maximum values ​​on the vertical axis of the convex portion H1 and the convex portion H2 adjacent to the convex portion H1 is calculated, and the minimum value on the vertical axis of the concave portion D1 sandwiched between the convex portions H1 and H2 is found. The value obtained by subtracting the minimum value from the average of the maximum values ​​thus found is used as the provisional emboss depth.

[0076] Furthermore, as shown in Figure 6, similar measurements are taken at two consecutive locations on the cross-sectional curve (the recess D1 and the recess D2 sandwiched between the protrusions H3 and H4) (two consecutive locations at this point). Then, the kitchen towel roll 10 is rotated three times by 90 degrees in the direction of the roll of the kitchen towel sheet 10x, and similar measurements are taken at each position (four measurement locations in the direction of the roll). The average value of the eight locations (2 x 4) is then used as the final embossing depth.

[0077] The kitchen towel sheet 10x according to this embodiment preferably has a concave-convex pattern derived from the papermaking process, which is different from the embossed pattern. By having a concave-convex pattern derived from the papermaking process, which is different from the embossed pattern, the kitchen towel sheet 10x can have better water absorption. Furthermore, the kitchen towel roll 10 obtained by winding up such a kitchen towel sheet 10x is less likely to be crushed. The method for applying the concave-convex pattern derived from the papermaking process will be described later.

[0078] Furthermore, because of the unevenness pattern resulting from the papermaking process, there is variation in the height of the convex portions on either side of the concave portion. Therefore, if the difference in the vertical axis between the convex portions sandwiching the concave portion (for example, convex portions H3 and H4 sandwiching concave portion D2) is 0.2 mm or more, measurements are taken at a location that avoids that portion.

[0079] The back surface 10b of the kitchen towel sheet 10x is not particularly limited as to whether it has an embossed pattern, as long as it has a pattern of protrusions and recesses derived from the papermaking process that is different from the embossed pattern. The back surface 10b may have a nested embossing or pin-to-pin embossing, or may not have an embossing, but preferably has a nested embossing or no embossing, and more preferably has no embossing.

[0080] Conventional kitchen towels ensure water absorption capacity using pin-to-pin or nested formats, but as mentioned above, when using thick base paper, embossing can cause the paper to become crushed, reducing water absorption capacity. For this reason, it is preferable that the front surface 10a of the kitchen towel sheet 10x according to this embodiment has linear embossing and the back surface 10b has no embossing.

[0081] (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.

[0082] (specific volume) The lower limit of the specific volume of a 10x kitchen towel sheet is 8cm 3 / g or more is preferable, and 9cm 3 / g or more is more preferable, and 13cm 3 / g or more is more preferable. The upper limit of the specific volume of a kitchen towel sheet 10x is 23 cm 3 / g or less, and 3 / g or less is more preferable, and 15cm 3 If the specific volume is less than the above-mentioned lower limit, the water absorbency of the kitchen towel sheet 10x may be poor, and if the specific volume is more than the above-mentioned upper limit, the basis weight may be low and the water absorbency may be poor when the roll diameter and roll length are kept constant. 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:

[0083] (paper thickness) The lower limit of the paper thickness of the 2-ply or 3-ply kitchen towel sheet 10x is preferably 0.35 mm or more, more preferably 0.40 mm or more, and even more preferably 0.45 mm or more. The upper limit of the paper thickness of the 2-ply or 3-ply kitchen towel sheet 10x is preferably 0.80 mm or less, more preferably 0.75 mm or less, and even more preferably 0.70 mm or less. If the paper thickness per product ply is less than the above-mentioned lower limit, the water absorbency may be poor, and if the paper thickness exceeds the above-mentioned upper limit, the cost per basis weight may be poor.

[0084] 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.

[0085] <Kitchen towel roll packaging> The kitchen towel roll packaging 1 is a film-packaged state in which three kitchen towel rolls 10, each of which is formed by rolling up a kitchen towel sheet 10x as described above, are arranged adjacent to each other with their axial directions parallel to each other.

[0086] The kitchen towel roll packaging 1 can be produced, for example, in the following order: (1) papermaking and creping, (2) embossing, (3) winding into a roll, and (4) wrapping three rolls in film.

[0087] FIG. 8 is a diagram showing a part of the papermaking process for the kitchen towel sheet 10x of this embodiment.

[0088] 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.

[0089] Here, "originating from the papermaking process" means that the unevenness is imparted between the head box of the papermaking machine and the outlet of the dryer 32 during the papermaking process of the kitchen towel sheet 10x. Specifically, in part of the papermaking process shown in Figure 8, the unevenness can be imparted in the press section 30, which is arranged between the dewatering roll 31 and the dryer 32. In the press section 30, the wet paper 34 and the uneven fabric 33 (the uneven fabric 33 loops between the press section 30 and the dryer 32) are pressed together, thereby imparting an uneven pattern to the wet paper 34.

[0090] 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 bring the specific volume (paper thickness) of the base paper within the numerical range described below.

[0091] 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).

[0092] When the packaging is caramel packaging, the equipment and process used are not particularly limited as long as they are known packaging equipment and processes capable of producing caramel packaging. For example, three kitchen towel rolls 10 are placed on a sheet-like packaging film 2, and the packaging film 2 is then wrapped around the kitchen towel roll 10 to form a cylindrical shape. Alternatively, three kitchen towel rolls 10 are inserted coaxially into one axial end of a pre-formed cylindrical packaging film 2. It is then preferable to fold two opposing flap-shaped edges of the packaging film 2 extending beyond both ends of the three kitchen towel rolls 10 toward each other, and then similarly fold two other opposing flap-shaped edges toward each other, and then seal (heat seal) these folded portions by heat fusion or the like. In other words, it is preferable that the packaging film 2 has heat sealing properties that allow it to be heat-sealed.

[0093] When the packaging is gusset packaging, there are no particular limitations on the equipment or process used, as long as they are known packaging equipment or processes capable of gusset packaging. For example, it is preferable to gusset package three kitchen towel rolls 10 with packaging film 2 made of polyethylene so that it conforms to the surface shape of the roll product, thereby producing a three-roll package (kitchen towel roll package 1). [Example]

[0094] 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.

[0095] The kitchen towel rolls of Examples 1 to 12 and Comparative Examples 1 to 5 were manufactured through the following steps: (1) papermaking and creping (TAD was used except for Comparative Example 5, where a general Yankee dryer was used), (2) embossing, and (3) roll winding. The papermaking for kitchen towel rolls, 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. Note that the embossing was only performed on the front side of the kitchen towel sheets.

[0096] (wet strength) The "wet strength" was evaluated on a four-point scale based on the WCDT (product ply) value. The evaluation criteria are as follows: ◎: WCDT was 280cN / 25mm or more. ○: WCDT was 250cN / 25mm or more and less than 280cN / 25mm. △: WCDT was 190cN / 25mm or more and less than 250cN / 25mm. ×: WCDT was less than 190cN / 25mm.

[0097] (Resistance to dirt during the papermaking process) The "resistance to contamination during the papermaking process" was evaluated on a four-point scale based on the amount of foreign matter contained in the base paper during papermaking (contamination during the papermaking process increases the amount of foreign matter generated). The evaluation criteria are as follows: ◎: There was significantly less foreign matter. ○: There was little foreign matter. △: There was no problem with foreign matter. ×: There were many foreign bodies.

[0098] (Water absorption) The "water absorbency" was evaluated based on the amount of water absorbed (product ply, per unit area) in four stages. The evaluation criteria are as follows: ◎ : 400g / m 2 That was all. ○ :370g / m 2 More than 400g / m 2It was less than. △: 320g / m 2 More than 370g / m 2 It was less than. × :320g / m 2 It was less than.

[0099] (cost per basis weight) The "cost per basis weight" was evaluated by measuring the basis weight per product ply of the kitchen towel sheet after production and evaluating it on a four-point scale. The evaluation criteria are as follows: ◎: Basis weight is 45g / m 2 It was as follows. ○: Basis weight is 45 g / m 2 Over 48g / m 2 It was as follows. △: Basis weight is 48g / m 2 Over 54g / m 2 It was as follows. ×: Basis weight is 54 g / m 2 It exceeded that.

[0100] The results obtained are shown in Tables 1 and 2.

[0101] [Table 1]

[0102] [Table 2]

[0103] From the above, it was confirmed that the kitchen towel roll of this example has good water absorbency and excellent wet strength, is less likely to be soiled during the papermaking process, making it easy to operate, and keeps costs down by maintaining the basis weight. [Explanation of symbols]

[0104] 1. Kitchen towel roll packaging 2. Packaging film 10 kitchen towel rolls 10a surface 10b back side 10e The outermost edge of a kitchen towel roll 10x kitchen towel sheets 20 paper tube 30 Press Department 31 Dewatering roll 32 Hair dryer 33 Textured Fabric 34 Wet Paper 200 test specimens 200a,200d Corner 210 Obi 220 Holder

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 kitchen towel sheet has a basis weight of 30 g / m ２ 54g / m or more ２ Hereinafter, the water absorption per unit area is 320 g / m ２ More than 520g / m ２ is as follows: The kitchen towel sheet has a wet cross-direction tensile strength (WCDT) of 190 cN / 25 mm or more and 410 cN / 25 mm or less, and a ratio of the wet longitudinal tensile strength (WMDT) to the wet cross-direction tensile strength (WCDT) (WMDT / WCDT) of 0.9 or more and 1.5 or less.

2. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a water absorption per unit weight of 8.0 g / g or more.

3. 2. The kitchen towel roll of claim 1, wherein the ratio of the wet cross direction tensile strength (WCDT) to the dry cross direction tensile strength (DCDT) of the kitchen towel sheet (WCDT / DCDT x 100(%)) is 19% or more and 43% or less.

4. 2. The kitchen towel roll according to claim 1, wherein the content of the wet strength agent in the kitchen towel sheet is 0.2% by mass or more and 1.9% by mass or less.

5. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a concave-convex pattern derived from a papermaking process that is different from the embossed pattern.

6. 2. A method for manufacturing a kitchen towel roll according to claim 1, 2. The method for producing a kitchen towel roll according to claim 1, wherein the cation demand of the pulp slurry after adding the wet strength agent is 20 μeq / L or more and 200 μeq / L or less.

7. 2. A method for manufacturing a kitchen towel roll according to claim 1, The method for producing a kitchen towel roll according to claim 1, wherein the cation demand at the stock inlet is 5 μeq / L or more and 50 μeq / L or less.

8. 2. A method for manufacturing a kitchen towel roll according to claim 1, 2. The method for producing a kitchen towel roll according to claim 1, wherein the amount of wet pulp in the pulp used as the raw material is 50% by mass or more and 100% by mass or less.

9. 2. A method for manufacturing a kitchen towel roll according to claim 1, The method for manufacturing a kitchen towel roll according to claim 1, wherein the paper is made using a TAD paper machine.

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