Manufacturing method of kitchen towel roll

Abstract

To provide a manufacturing method of a kitchen towel roll with low basis weight, good productivity by less stains in papermaking process, and generating less paper powders when used as a kitchen towel sheet even when base paper for a kitchen towel roll is manufactured by a TAD paper-making machine.SOLUTION: A manufacturing method of a kitchen towel roll by winding a kitchen towel sheet obtained by applying an embossment pattern to base paper having a basis weight of 16 g / m2 or over and 27 g / m2 or under and produced by paper-making using a TAD paper-making machine and laminating in 2 ply or a 3 ply in a roll state, is characterized by that, in the papermaking process using the TAD paper-making machine, a blending amount of a wet pulp is 50 mass% or over and 100 mass% or under to a pulp used as a raw material, and a cation demand of a paper stock (pulp slurry) after addition of a wet paper strength agent is 3 μeq / L or over and 60 μeq / L or under.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for making a kitchen towel roll. [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] Kitchen towels made with TAD papermaking technology have a rough, bulky texture, resulting in little interfiber bonding and low strength. While strength can be increased by beating the pulp more thoroughly, this increases the amount of fine fibers. In TAD papermaking machines, which dry the paper on a rough, textured fabric, this reduces first-pass retention (FPR: the retention rate of paper stock (mainly fibers), also known as the primary retention rate). As a result, fine fibers and chemicals attached to the fine fibers circulate through the papermaking process, making the towels susceptible to soiling. Furthermore, the increased fine fibers increase the likelihood of paper dust during use as a kitchen towel. While increasing the basis weight improves FPR and reduces soiling during the papermaking process and paper dust during use, it also increases costs. Thus, it is difficult to produce kitchen towels using TAD papermaking machines that are less susceptible to soiling during the papermaking process and produce less paper dust during use without increasing the basis weight.

[0006] Therefore, an object of the present invention is to provide a method for manufacturing kitchen towel rolls that does not have a high basis weight (i.e., the basis weight cost is not high), that is less susceptible to contamination during the papermaking process, and that is highly productive, and that produces less paper dust when used as a kitchen towel sheet, even when the base paper for kitchen towel rolls is manufactured using a TAD papermaking machine. [Means for solving the problem]

[0007] As a result of extensive research into achieving the above-mentioned object, the present inventors have found that the object can be achieved by controlling the basis weight of the base paper, the wet pulp blending ratio in the papermaking process, and the cation demand of the stock (pulp slurry) after addition of the wet strength agent within predetermined ranges, and have thus completed the present invention.

[0008] (1) Basis weight 16g / m2 made using a TAD paper machine 2 More than 27g / m 2 A method for manufacturing a kitchen towel roll, comprising: providing an embossed pattern on the following base paper, laminating the resulting base paper in two or three plies, and winding the resulting kitchen towel sheet into a roll; In the papermaking process using the TAD paper machine, the amount of wet pulp blended is 50% by mass or more and 100% by mass or less of the pulp used as raw material, and the cation demand of the paper material (pulp slurry) after adding the wet strength agent is 3 μeq / L or more and 60 μeq / L or less. A method for manufacturing a kitchen towel roll, characterized by: (2) The manufacturing method according to (1), wherein the first pass retention is 69% or more and 95% or less in the papermaking process using the TAD papermaking machine. (3) The manufacturing method according to (1), wherein in the papermaking process using the TAD papermaking machine, the papermaking speed of the Yankee dryer is 700 m / min or more and 1800 m / min or less. (4) The manufacturing method according to (1), wherein in the papermaking process using the TAD paper machine, the cation demand of the paper stock (pulp slurry) at the stock inlet is 5 μeq / L or more and 50 μeq / L or less. (5) The water absorption per unit area of the product ply of the kitchen towel sheet is 240 g / m 2 More than 610g / m 2 The manufacturing method according to (1), which is as follows: (6) The specific volume of the kitchen towel sheet is 7 cm 3 / g or more 23cm 3 / g or less, (1). (7) The manufacturing method according to (1), wherein the paper thickness of the product ply of the kitchen towel sheet is 0.35 mm or more and 0.80 mm or less. (8) The manufacturing method according to (1), wherein the kitchen towel sheet has a concave-convex pattern resulting from the papermaking process that is different from the embossed pattern. [Effects of the Invention]

[0009] According to the present invention, even when base paper for kitchen towel rolls is produced using a TAD papermaking machine, the basis weight is not high, there is little contamination during the papermaking process, and productivity is high, and there is little paper dust when the kitchen towel roll is used as a kitchen towel sheet. [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] The method for manufacturing a kitchen towel roll according to an embodiment of the present invention is a method for manufacturing a kitchen towel roll 10 by rolling up a kitchen towel sheet 10x made by imparting an embossed pattern to base paper made using a TAD papermaking machine and laminating it into two or three plies. Each step and the products produced 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 TAD 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 a pulp slurry. When flowing pulp (slush pulp) is used, a pulper does not have to be used. 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 the like and dried. In an embodiment of the present invention, a TAD papermaking machine is used in the papermaking process, so a TAD is used as the dryer section. The web that passes through the dryer section is wound up to become base paper for kitchen towel rolls. In addition, the web may be appropriately slit using a winder to adjust the width or to make a short roll (a roll with a shorter length). Calendering 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 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, wet pulp refers to the above-mentioned wet pulp (sheet) or slush pulp (flowing pulp), and the wet pulp content (bone dry mass) of 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 solids content of 60% by mass or less, preferably 1% by mass or more and 50% by mass or less, more preferably 2% by mass or more and 20% by mass or less, and even more preferably 3% by mass or more and 10% by mass or less. The solids content of dry pulp (sheet) is approximately 90% by mass. The lower limit of the above range of the wet pulp content is preferably 65% by mass or more, more preferably 80% by mass or more. The lower limit of the above range of the wet pulp content is preferably 65% by mass or more, more preferably 80% by mass or more. If the wet pulp content is less than 50% by mass, the strength of the kitchen towel sheet 10x will be reduced, and as a result, increased beating will result in increased paper dust. Kitchen towel sheets 10x made with wet pulp are easier to increase in strength than those made with only dry pulp, so beating can be weakened to reduce the amount of fine fibers produced, which can contribute to reducing stains during the papermaking process and paper dust when using the kitchen towel sheets 10x.

[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 = 40-90% by mass:10-60% by mass, more preferably NBKP:LBKP = 50-80% by mass:20-50% by mass, and even more preferably NBKP:LBKP = 60-70% by mass:30-40% by mass. An NBKP blending ratio of more than 90% by mass or an LBKP blending ratio of less than 10% by mass is undesirable due to increased costs. Furthermore, an NBKP blending ratio of less than 40% by mass or an LBKP blending ratio of more than 60% by mass results in reduced strength, and increasing beating to compensate for the reduced strength may result in increased paper powder during use as a kitchen towel sheet 10x.

[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), the dry strength agent is preferably anionic, and more preferably amphoteric and anion-rich. When the dry strength agent is anionic, the wet and dry strength agents are better fixed to the fibers. The wet strength agent is preferably added in a step 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 concentration is preferably 1.5% by mass or more and 5.0% by mass or less, more preferably 2.0% by mass or more and 4.5% by mass or less, and even more preferably 2.5% by mass or more and 4.0% by mass or less. 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 cation demand of the stock (pulp slurry) after the addition of the wet strength agent is 3 μeq / L or more and 60 μeq / L or less. The cation demand of the stock (pulp slurry) after the addition of the wet strength agent refers to the cation demand of the stock (pulp slurry) at the location where the wet strength agent is added. The cationic demand of paper stock (pulp slurry) is measured as follows: First, 100 g of pulp slurry after adding a wet strength agent is sampled and suction filtered using Whatman ashless quantitative filter paper (grade 41), and the filtrate is collected. Next, using a particle charge analyzer (Muteck PCD-02), the cationic demand is measured 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 paper stock (pulp slurry) after adding the wet strength agent is less than 3 μeq / L, the wet strength agent is added in excess, leading to contamination of the papermaking process due to the wet strength agent not adhering to the fibers.On the other hand, if the cationic demand of the paper stock (pulp slurry) after adding the wet strength agent is more than 60 μeq / L, the wet strength agent is not added sufficiently, the adhesion to the fine fibers is weak, and a lot of paper dust will be produced when used as a kitchen towel sheet 10x. The lower limit of the cationic demand of the stock (pulp slurry) after the addition of the wet strength agent is preferably 5 μeq / L or more, more preferably 7 μeq / L or more. The upper limit of the cationic demand of the stock (pulp slurry) after the addition of the wet strength agent is preferably 45 μeq / L or less, more preferably 30 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). 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 2 μeq / L or more and 40 μeq / L or less. If the cationic demand at the stock inlet is less than 2 μeq / L, the addition of the wet strength agent may be excessive, causing the wet strength agent to not adhere to the fibers and resulting in contamination during the papermaking process. On the other hand, if the cationic demand at the stock inlet is more than 40 μeq / L, the addition of the wet strength agent may be insufficient, resulting in poor adhesion of the fine fibers to the fibers and resulting in a large amount of paper dust when used as a kitchen towel. The lower limit of the cationic demand at the stock inlet is more preferably 4 μeq / L or more, even more preferably 6 μeq / L or more, and the upper limit of the cationic demand is more preferably 33 μeq / L or less, even more preferably 28 μeq / L or less.

[0021] (First Pass Retention) The first pass retention (FPR) when the stock is ejected from the inlet onto the wire is preferably 69% or more and 95% 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 69%, the fiber yield will be low and the papermaking process will be soiled. On the other hand, if the FPR is more than 95%, the basis weight will be too high and the papermaking speed will be too low, resulting in poor productivity. The lower limit of the FPR is more preferably 74% or more, and even more preferably 79% or more, and the upper limit of the FPR is more preferably 93% or less, and even more preferably 92% or less.

[0022] (making speed) The method for manufacturing paper towel roll 1 of the present invention uses a TAD paper machine, and therefore uses a TAD dryer 35 to dry paper web 30b as shown in Figure 8, but preferably uses a Yankee dryer 36 to auxiliary dry paper web 30c in the same process. In this case, the paper speed of Yankee dryer 36 is preferably set to 700 m / min or more and 1800 m / min or less. If the paper speed of the Yankee dryer 36 is less than 700 m / min, the basis weight will be too high or the paper speed will be too low, resulting in poor productivity, while if it exceeds 1800 m / min, the fiber yield will be low and contamination may occur during the papermaking process. The lower limit of the paper speed of the Yankee dryer 36 is more preferably 900 m / min or more, and even more preferably 1100 m / min or more. The upper limit of the paper speed of the Yankee dryer 36 is more preferably 1500 m / min or less, and even more preferably 1300 m / min or less. The details of a part of the papermaking process for the paper towel sheet 10x of this embodiment shown in FIG. 8 will be described later.

[0023] (Basic weight) The basis weight (1 ply) of the base paper for kitchen towel rolls according to this embodiment is 16 g / m 2 More than 27g / m 2 The basis weight is 16 g / m 2 If the grammage is less than 27 g / m², the FPR will be low and staining will occur easily during the papermaking process. Furthermore, the strength will be low, so beating will be required to be stronger, resulting in an increase in fine fibers and a large amount of paper dust when used as a kitchen towel sheet 10x. 2 If it exceeds this, it becomes less cost-effective. The lower limit of the above range of basis weight is preferably 19 g / m 2 More preferably, it is 21 g / m or more. 2 The upper limit of the above range of basis weight is preferably 25 g / m 2 or less, more preferably 23 g / m 2 The basis weight can be measured based on JIS P 8124.

[0024] (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of the kitchen towel roll base paper (one ply) according to JIS P 8113 is preferably 1100 cN / 75 mm or more, more preferably 1400 cN / 75 mm or more, and even more preferably 1500 cN / 75 mm or more. The upper limit is preferably 2000 cN / 75 mm or less, more preferably 1800 cN / 75 mm or less, and even more preferably 1700 cN / 75 mm or less.

[0025] The dry cross direction tensile strength (DCDT) of the kitchen towel roll base paper (one ply) according to JIS P 8113 is preferably 1000 cN / 75 mm or more, more preferably 1300 cN / 75 mm or more, and even more preferably 1400 cN / 75 mm or more. The upper limit is preferably 1900 cN / 75 mm or less, more preferably 1700 cN / 75 mm or less, and even more preferably 1600 cN / 75 mm or less. In this case, the cross direction refers to the CD direction (roll width direction).

[0026] If DMDT or DCDT is below the lower limit, the basis weight and FPR will be low, leading to contamination during the papermaking process. On the other hand, if DMDT or DCDT is above the upper limit, the cost per basis weight will be poor. DMDT and DCDT for kitchen towel roll base paper are measured in accordance with JIS P 8113.

[0027] <Kitchen towel roll> FIG. 2 is a perspective view of a kitchen towel roll 10 manufactured by the method for manufacturing a kitchen towel roll according to this embodiment.

[0028] 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).

[0029] 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.

[0030] 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.

[0031] (winding length and winding diameter) The lower limit of the winding 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 winding length exceeds the above-mentioned upper limit, the basis weight must be reduced to achieve a constant winding diameter DR, which reduces the FPR and may cause contamination during the papermaking process. In addition, the strength is reduced, requiring stronger beating, which results in increased paper dust when used as a kitchen towel sheet. Furthermore, if the winding length is less than the above-mentioned lower limit, the paper thickness must be increased to achieve a constant winding diameter DR, which may result in poor basis weight costs.

[0032] 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.

[0033] The lower limit of the winding 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. On the other hand, if the winding diameter DR exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x will be high, resulting in lower costs. Furthermore, if the winding diameter DR is below the above-mentioned lower limit, the FPR will be low to reduce the basis weight, which may cause contamination during the papermaking process. Furthermore, the strength will be low, requiring stronger beating, which will result in increased paper dust when used as a kitchen towel sheet.

[0034] 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.

[0035] (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 amount of water absorbed may be less, making it difficult to use as a kitchen towel sheet.

[0036] 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 upper limit is preferably 550 g or less, more preferably 490 g or less, and even more preferably 450 g or less. On the other hand, if the roll weight is below the above-mentioned lower limit, the basis weight will be low, which may result in a low FPR and lead to contamination during the papermaking process. 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.

[0037] 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.

[0038] (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 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 On the other hand, if the roll density exceeds the upper limit, the basis weight will be high and the cost will be low. On the other hand, if the roll density is below the lower limit, the basis weight will be low, which may lead to contamination during the papermaking process.

[0039] 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:

[0040] (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 On the other hand, if the winding density is below the lower limit, the basis weight will be high and the cost may be low. On the other hand, if the winding density is above the upper limit, the basis weight will be low, which may lead to contamination during the papermaking process.

[0041] 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:

[0042] (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.

[0043] (Paper tube outer diameter) The paper tube outer diameter DI, which is the outer diameter of the paper 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. On the other hand, if the paper 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.

[0044] 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.

[0045] <Kitchen towel roll>

[0046] The kitchen towel sheet 10x according to this embodiment is a two-ply or three-ply sheet, and is preferably a two-ply sheet.

[0047] (Basic weight) The basis weight per product ply of the kitchen towel sheet 10x according to this embodiment is preferably 30 g / m 2 More preferably, 34 g / m 2 More preferably, it is 38 g / m or more. 2 The upper limit is preferably 56 g / m 2 More preferably, it is 50 g / m or less. 2 More preferably, it is 46 g / m or less. 2The following are the results. If the basis weight per product ply is below the above-mentioned lower limit, the FPR will be low, leading to contamination during the papermaking process. Furthermore, if the beating is strengthened to compensate for the reduced strength, the resulting paper dust may be increased when the product is used as a kitchen towel sheet. Furthermore, if the basis weight exceeds the above-mentioned upper limit, the cost may be poor. Furthermore, if the basis weight exceeds the upper limit, the reel diameter DR will be increased to maintain a certain roll density. Furthermore, as the reel diameter DR increases, the contact area between the rolls increases, resulting in greater damage to the kitchen towel roll 10. Furthermore, more paper dust will be generated when the rolls rub against each other. Basis weight can be measured based on JIS P 8124, but basis weight per product ply refers to the basis weight measured without changing the number of plies of the kitchen towel sheet 10x (without peeling or increasing them).

[0048] (Water absorption) In this embodiment, the water absorption per unit area of the kitchen towel sheet 10x is 240 g / m 2 More than 610g / m 2 It is preferable that the water absorption per unit area is less than the above-mentioned lower limit, the basis weight will be low, the FPR will be low, and this may lead to contamination during the papermaking process. Furthermore, if the water absorption per unit area exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x will be high, which may result in poor cost performance. Furthermore, if the water absorption per unit area exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x will be high, and the roll diameter DR will be large to achieve a certain roll density. Furthermore, increasing the roll diameter DR increases the contact area between rolls, which may result in greater damage to the kitchen towel roll 10. The lower limit of the above range of water absorption per unit area is more preferably 290 g / m 2 More preferably, it is 380 g / m or more. 2 The upper limit of the above range of water absorption per unit area is more preferably 550 g / m 2 More preferably, it is 500 g / m or less. 2 The following is the result.

[0049] Furthermore, the lower limit of the water absorption per unit weight of the kitchen towel sheet 10x is preferably 8.0 g / g or more, more preferably 8.5 g / g or more, and even more preferably 9 g / g or more. There is no particular upper limit, but it is preferably 14 g / g or less, more preferably 13 g / g or less. When the water absorption per unit weight is equal to or greater than the above-mentioned lower limit, the decrease in the water absorption of the kitchen towel sheet 10x can be more effectively prevented. On the other hand, when the water absorption per unit weight is less than the above-mentioned lower limit, the basis weight of the kitchen towel sheet 10x must be increased to ensure the required water absorption, which may result in poor cost performance. Furthermore, when the water absorption per unit weight exceeds the above-mentioned upper limit, the paper thickness relative to the basis weight increases, resulting in a high specific volume, which may result in a low FPR and lead to contamination during the papermaking process.

[0050] FIG. 7 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the embodiment.

[0051] 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 weight of the test piece 200 before water absorption is measured using an electronic balance. The test piece 200 is set in a holder 210 (a jig that fixes three points of the test piece 200, made of a metal that does not absorb water).

[0052] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 200 set in the holder 210 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 200 is removed from the distilled water together with the holder 210, and as shown in Fig. 7, the holder 210 and the test piece 200 are hung from a rod placed in an empty water tank with the corner 200a facing up, and the lid of the water tank is closed and left for 5 minutes.

[0053] Thereafter, the holder 210 and the test piece 200 are taken out of the water tank, the holder 210 is 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.

[0054] 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.

[0055] (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.

[0056] 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.

[0057] An embossed pattern may be applied to the ply on the front surface 10a of the kitchen towel sheet 10x. By applying an embossed pattern to 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). The absence of an embossed pattern on the back surface 10b results in a kitchen towel sheet 10x (kitchen towel roll 10) that produces less paper dust. The embossed pattern is not particularly limited as long as it is a pattern typically used on kitchen towels, such as a dotted or linear pattern, but a linear embossed pattern is preferred. A linear embossed pattern can more effectively suppress the generation of paper dust when rolls rub against each other.

[0058] FIG. 3 is a diagram showing an example of an embossing pattern on a kitchen towel roll according to an embodiment.

[0059] 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.

[0060] 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, but may be tilted (in this case, rectangle E may be rhombic rather than square). Using such a pattern can further improve the water absorption capacity of a kitchen towel sheet 10x with high water absorption capacity. Furthermore, a linear embossed pattern can more effectively suppress the generation of paper dust when rolls rub against each other.

[0061] 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 or more. 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 2The 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.

[0062] 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 kitchen towel sheet 10x, which has high water absorption capacity as in this embodiment, can be further improved. Furthermore, damage caused by rubbing between rolls can be more effectively suppressed. The total length is determined by actual measurement using the method described above, but it can also be measured using a general microscope. The embossment area ratio of the linear embossing pattern, which is 0.1 mm to 4 mm in width and 5 mm or longer, relative to the area of the kitchen towel sheet 10x, is preferably 4% or more, more preferably 6% or more, and even more preferably 8% or more, and is preferably 35% or less, more preferably 25% or less, and even more preferably 15% or less. The embossed area ratio is calculated by measuring the total length of all embossments that are 0.1 mm to 4 mm thick and 5 mm or longer inside a rectangle E that includes all of the embossed patterns, as shown in Figure 3, and then calculating the embossed area by multiplying the total length (mm) by the width (mm). This is then calculated as (embossed area / area of rectangle E) x 100 (%). If it is difficult to determine the embossed area ratio, the area ratio of the convex portions of the embossing roll used in embossing can be considered to be the embossed area ratio for one sheet of kitchen towel sheet 10x.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 produces less paper dust. The method for applying the concave-convex pattern derived from the papermaking process will be described later.

[0073] 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.

[0074] 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.

[0075] Conventional kitchen towels ensure water absorption capacity using pin-to-pin or nested formats, but when using thick base paper using TAD papermaking technology as in the present application, as mentioned above, the embossing can cause the paper to become crushed, resulting in a decrease in 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.

[0076] (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.

[0077] (specific volume) The specific volume of 10x kitchen towel sheets is 7cm 3 / g or more 23cm 3 The lower limit of the above range of the specific volume of the kitchen towel sheet 10x is preferably 9 cm 3 / g or more, more preferably 13 cm 3 The upper limit of the specific volume of the kitchen towel sheet 10x is preferably 19 cm 3 / g or less, and more preferably 15 cm 3 / g or less. On the other hand, if the specific volume is below the lower limit mentioned above, the basis weight of the kitchen towel sheet 10x will be high when the roll diameter DR is within a certain range, which may result in poor cost performance. Also, if the specific volume exceeds the upper limit mentioned above, the basis weight will be low when the roll diameter DR is within a certain range, which may result in a low FPR and lead to contamination during the papermaking process. Furthermore, the strength will be reduced and the beating will be strengthened, which may result in a lot of paper dust when used as a kitchen towel sheet. 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:

[0078] The thickness of the product ply of the kitchen towel sheet 10x is preferably 0.35 mm or more and 0.80 mm or less. The lower limit of the above range of the product ply thickness is more preferably 0.40 mm or more, and even more preferably 0.45 mm or more. The upper limit of the above range of the product ply thickness is more preferably 0.75 mm or less, and even more preferably 0.70 mm or less. On the other hand, if the paper thickness of the product ply is below the above-mentioned lower limit, the basis weight will be low, which may lead to a low FPR and contamination during the papermaking process. Furthermore, the strength will be low and the beating will be strong, which may result in a lot of paper dust when used as a kitchen towel sheet. Furthermore, if the paper thickness of the product ply exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x will be high, which may result in poor cost performance.

[0079] Paper thickness can be measured using a thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring table, and the gauge is read when the probe is lowered at a speed of 1 mm per second or less. The sample is measured using 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 locations, and the results are averaged and converted proportionally to the number of plies in the product.

[0080] <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.

[0081] The kitchen towel roll packaging 1 can be manufactured, for example, through the following steps: (1) papermaking and creping, (2) embossing, (3) roll winding, and (4) film wrapping of three rolls. The kitchen towel sheet 10x manufacturing (papermaking) process uses TAD papermaking technology.

[0082] FIG. 8 is a diagram showing a part of the papermaking process for the kitchen towel sheet of the embodiment.

[0083] 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.

[0084] Note that "originating from the papermaking process" means that, in the papermaking process of paper towel sheet 10x, an uneven pattern is imparted between head box 31 of the papermaking machine and the outlet of Yankee dryer 36. Specifically, in a part of the papermaking process shown in Figure 8, paper web 30a in a pulp slurry state is sprayed (supplied) from head box 31 to between first fabric (forming fabric) 32 and second fabric (uneven fabric) 33, and is pulled onto second fabric (uneven fabric) 33 by forming roll 34, forming paper web 30b in a wet paper state. Next, the paper web 30b is dried together with the second fabric (concave-convex fabric) 33 in a TAD dryer 35, resulting in concave-convex patterns being formed on the paper web 30c, which is in a dried sheet state. While two TAD dryers 35 are shown in FIG. 8, a single unit is also acceptable. Although a Yankee hood is shown on the Yankee dryer 36, the hood may be omitted. Furthermore, creping may be performed in the Yankee dryer 36.

[0085] 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.

[0086] 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).

[0087] 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. Alternatively, three kitchen towel rolls 10 arranged so that their axial directions are parallel to one another are raised from below the set sheet-like packaging film 2 to the sheet surface (lower surface side) of packaging film 2. In this state, packaging film 2 is wrapped around the periphery of kitchen towel roll 10 to form a cylinder, and the overlapping portions of both ends of packaging film 2 on the periphery of kitchen towel roll 10 are heat-sealed (not shown) along the long side of the paper core of kitchen towel roll 10. That is, the packaging film 2 preferably has heat sealing properties that allow it to be heat-sealed.

[0088] 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]

[0089] 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.

[0090] The kitchen towel roll base paper and kitchen towel rolls of Examples 1 to 12 and Comparative Examples 1 to 5 were manufactured through the following processes: (1) papermaking and creping (all using a TAD papermaking machine), (2) embossing, and (3) roll winding. The kitchen towel roll base paper and kitchen towel rolls of all Examples and Comparative Examples were measured for each parameter according to the methods described above, and the following evaluations were also carried out according to the methods described above. Note that the embossing was only performed on the front side of the kitchen towel sheets.

[0091] (Resistance to contamination 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 generated 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.

[0092] (Cost by basis weight) The "cost by basis weight" was evaluated by measuring the basis weight per ply of the kitchen towel sheet base paper and evaluating it on a four-point scale. The evaluation criteria are as follows: ◎: Basis weight is 23 g / m 2 It was as follows. ○: Basis weight is 23 g / m 2 More than 25g / m 2 It was as follows. △: Basis weight is 25g / m 2 Over 27g / m 2 It was as follows. ×: Basis weight is 27 g / m 2 It exceeded that.

[0093] (Amount of paper dust when used as a kitchen towel sheet) Regarding the amount of paper dust, 30 testers used a 100cm kitchen towel sheet with the same ply count. 2 They wiped the table using the wiper and chose either "a lot of paper dust" or "a little paper dust." ◎: More than 28 monitors selected "less paper dust." ○: The number of monitors who selected "less paper dust" was between 25 and 27. △: The number of monitors who selected "less paper dust" was between 22 and 24. ×: Fewer than 21 monitors selected "less paper dust."

[0094] The results obtained are shown in Tables 1 and 2.

[0095] [Table 1]

[0096] [Table 2]

[0097] From the above, it was confirmed that the kitchen towel roll of this example has a low basis weight and is less susceptible to contamination during the papermaking process, making it highly productive, and produces less paper dust when used as a kitchen towel sheet. [Explanation of symbols]

[0098] 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 30a, 30b, 30c Paper web 31 Headbox 32,33 Fabric 34 Forming roll 35 Through air dryer 36 Yankee Dryer 200 test specimens 200a Corner 210 Holder

Claims

1. Paper made using a TAD paper machine with a basis weight of 16 g / m ２ More than 27g / m ２ A method for producing a kitchen towel roll, comprising: providing an embossed pattern on the following base paper, laminating the resulting base paper in two or three plies, and winding the resulting kitchen towel sheet into a roll; In the papermaking process using the TAD papermaking machine, the amount of wet pulp blended is 50% by mass or more and 100% by mass or less of the pulp used as a raw material, and the cation demand of the paper stock (pulp slurry) after adding the wet strength agent is 3 μeq / L or more and 60 μeq / L or less. A method for manufacturing a kitchen towel roll, characterized by:

2. The method for manufacturing a kitchen towel roll according to claim 1, wherein the first pass retention is 69% or more and 95% or less in the papermaking process using the TAD papermaking machine.

3. 2. The method for producing a kitchen towel roll according to claim 1, wherein in the papermaking process using the TAD papermaking machine, the papermaking speed of the Yankee dryer is 700 m / min or more and 1800 m / min or less.

4. 2. The method for producing a kitchen towel roll according to claim 1, wherein in the papermaking process using the TAD papermaking machine, the cation demand of the paper stock (pulp slurry) at the stock inlet is 2 μeq / L or more and 40 μeq / L or less.

5. The water absorption per unit area of the product ply of the kitchen towel sheet is 240 g / m ２ 610g / m or more ２ 2. The method of claim 1, wherein the method comprises the following steps:

6. The specific volume of the kitchen towel sheet is 7 cm ３ / g or more 23cm ３ 2. The method for producing a kitchen towel roll according to claim 1, wherein the kinematic viscosity is 1 / g or less.

7. 2. The method for producing a kitchen towel roll according to claim 1, wherein the thickness of the product ply of the kitchen towel sheet is 0.35 mm or more and 0.80 mm or less.

8. The method for producing a 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.

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