Kitchen towel roll

Abstract

To provide a kitchen towel roll capable of being made into a sheet that hardly causes wrinkles during use or production and capable of suppressing generation of paper dust while maintaining texture and water absorbency.SOLUTION: There is provided a kitchen towel roll in which a kitchen towel sheet is wound into a roll, the kitchen towel sheet being formed by laminating two or three plies of sheets to which an embossed pattern is applied, and the kitchen towel roll is configured in that: a winding density is 0.28 m / cm2 or more and 0.43 m / cm2 or less; a core outer diameter is 20 mm or more and 60 mm or less; a basis weight per one ply of the kitchen towel sheet is 17.6 g / m2 or more and 26.5 g / m2 or less; a paper thickness is 2.1 mm / 10 plies or more and 4.5 mm / 10 plies or less; a specific volume is 7 cm3 / g or more and 23 cm3 / g or less; an NBKP content of an outer surface of a surface ply is 60 mass% or more and 100 mass% or less; and an NBKP content of an inner surface is 30 mass% or more and 80 mass% or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a kitchen towel roll. [Background technology]

[0002] In recent years, various kitchen towel sheets and kitchen towel rolls made by rolling up sheets have been developed and sold.

[0003] In such kitchen towel rolls, the length of the rolled kitchen towel sheets is increasing, but high-quality products require not only longer lengths but also qualities such as aesthetic appeal and water absorbency.

[0004] Among high-end products, kitchen towel sheets made using the so-called TAD (Through Air Drying) papermaking technology (hereinafter also referred to as the "TAD papermaking method"), which uses air drying, are thick, have a soft texture, and are highly absorbent.

[0005] Because kitchen towel sheets made using TAD papermaking technology have the advantages described above, many kitchen towel rolls on the market also use TAD papermaking technology in their manufacturing process.

[0006] As a prior art document relating to kitchen towel rolls, for example, Patent Document 1 describes a kitchen towel roll in which sheets with embossed patterns are glued together and laminated into two plies, and the resulting kitchen towel sheet is wound into a roll. The kitchen towel sheet has a concave-convex pattern derived from the papermaking process that is different from the embossed pattern, and the basis weight of the two plies is 30 g / m. 2 More than 54g / m 2 The following is a paper thickness of 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less, 2 ply, 1 m 2 The kitchen towel roll is characterized by having a water absorption per roll of 220 g to 600 g, a roll length of 14 m to 44 m, and a roll diameter of 110 mm to 189 mm. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2022-116768 Summary of the Invention [Problem to be solved by the invention]

[0008] However, kitchen towel sheets made using TAD papermaking technology have unevenness and are bulky, resulting in little inter-fiber bonding and low strength. This causes problems such as wrinkles forming along the sheet, not only during use but also when the sheet is wound up during the manufacturing process (i.e., cosmetic properties are reduced).In addition, because the sheet has low strength and is bulky, paper dust is easily generated during the papermaking process, and the paper dust must be cleaned away, resulting in poor operability.

[0009] Possible measures to suppress wrinkles while increasing sheet strength include: 1. increasing the basis weight, 2. increasing the ratio of softwood bleached kraft pulp (NBKP) (NBKP / LBKP: also known as the N / L ratio), and 3. increasing paper density. Of the above measures, measures 2 and 3 are considered to suppress paper dust.

[0010] However, measures 1 and 2 had the problem of making the sheet too strong, resulting in a stiff feel and poor texture, while measure 3 had the problem of reducing the sheet's absorbency and quality.

[0011] The present invention has been made in view of the above circumstances, and aims to provide a kitchen towel roll that can be made into a sheet that is less likely to wrinkle during use or production while maintaining texture and water absorbency, and that can also suppress the generation of paper dust. [Means for solving the problem]

[0012] After extensive research, the inventors discovered that a kitchen towel roll made by winding up two or three plies of kitchen towel sheets, at least one of which has an embossed pattern, can be produced by adjusting the winding density and core outer diameter of the kitchen towel roll, as well as the basis weight, paper thickness, and specific volume per ply of the kitchen towel sheet, within predetermined ranges, and by adjusting the NBKP content of each of the outer and inner plies on the front side of the kitchen towel sheet within predetermined ranges, thereby achieving a kitchen towel roll that is wrinkle-resistant during use and production while maintaining its texture and water absorbency, and that also reduces the generation of paper dust, thereby solving the above-mentioned problems and leading to the completion of the present invention.

[0013] (1) The first aspect of the present invention is a kitchen towel roll in which a kitchen towel sheet is formed by laminating two or three plies of a sheet having an embossed pattern on at least one ply, and the kitchen towel roll has a winding density of 0.28 m / cm. 2 More than 0.43m / cm 2 The core outer diameter is 20 mm or more and 60 mm or less, and the basis weight per ply of the kitchen towel sheet is 17.6 g / m 2 More than 26.5g / m 2 The following: Paper thickness is 2.1mm / 10 ply or more and 4.5mm / 10 ply or less, specific volume is 7cm 3 / g or more 23cm 3 / g or less, the softwood bleached kraft pulp (NBKP) content of the outer surface of the ply on the surface side of the kitchen towel sheet is 60% by mass or more and 100% by mass or less, and the softwood bleached kraft pulp (NBKP) content of the inner surface of the ply on the surface side is 30% by mass or more and 80% by mass or less.

[0014] (2) The second aspect of the present invention is the kitchen towel roll according to (1), wherein the water absorption per unit area of ​​the two plies of the kitchen towel sheet is 300 g / m 2 More than 690g / m 2 It is characterized by the following:

[0015] (3) A third aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the content ratio of the NBKP and hardwood bleached kraft pulp (LBKP) in the entire kitchen towel sheet is NBKP:LBKP = 40 to 95% by mass: 5 to 60% by mass.

[0016] (4) A fourth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the tensile strength in the MD direction (DMDT) of the kitchen towel sheet in the dry state according to JIS P 8113 for a 2-ply or 3-ply structure is 1500 cN / 76 mm or more and 4200 cN / 76 mm or less, and the tensile strength in the CD direction (DCDT) of the 2-ply or 3-ply structure according to JIS P 8113 for a 2-ply or 3-ply structure is 1400 cN / 76 mm or more and 4100 cN / 76 mm or less.

[0017] (5) A fifth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the water absorption per unit mass of the two plies is 8 g / g or more and 20 g / g or less. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a kitchen towel roll that can be made into a sheet that is less likely to wrinkle during use or production while maintaining texture and water absorbency, and that can also suppress the generation of paper dust. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Figure 2]FIG. 2 is a diagram showing the NBKP content in each ply of the sheet in the kitchen towel roll of the present invention. [Figure 3] FIG. 1 is a diagram showing a method for measuring the NBKP content in the kitchen towel sheet of the present invention. [Figure 4] FIG. 2 is a diagram showing an example of an embossed pattern imparted to the sheet in the kitchen towel roll of the present invention. [Figure 5] FIG. 1 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the present invention. [Figure 6] 1 is a diagram showing a part of the papermaking process for the kitchen towel sheet of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] 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.

[0021] Furthermore, the MD direction of the kitchen towel sheet is the machine direction in which the kitchen towel sheet is made, and the CD direction is the direction perpendicular to the MD direction (cross direction).

[0022] <Kitchen towel roll> Fig. 1 is a perspective view of a kitchen towel roll 1 according to one embodiment of the present invention. As shown in Fig. 1, the kitchen towel roll 1 according to this embodiment is a kitchen towel sheet 1x made by laminating two plies, each ply having an embossed pattern 10 on at least the front ply, and wound into a roll. Preferably, the kitchen towel sheet 1x has perforations in the sheet width direction at approximately equal intervals in the winding direction of the roll (not shown). As shown in Figure 1, the surface of the kitchen towel sheet 1x facing the outside of the roll is referred to as surface 1a (surface of the kitchen towel sheet 1x), and the surface facing the center of the roll is referred to as back surface 1b (back surface of the kitchen towel sheet 1x). The edge of the kitchen towel sheet 1x is referred to as the outermost edge 1e of the kitchen towel roll 1.

[0023] The kitchen towel roll 1 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 and remove dirt, as well as other rolls of sanitary paper.

[0024] (winding length and winding diameter) The lower limit of the roll length of the kitchen towel roll 1 is preferably 18 m or more, more preferably 22 m or more, and even more preferably 27 m or more, and the upper limit is preferably 45 m or less, more preferably 40 m or less, and even more preferably 31 m or less. If the reel length is less than 18 m and the reel diameter remains the same, the reel density will decrease, resulting in the kitchen towel sheet 1x being more prone to wrinkling. If the reel length is more than 45 m and the reel diameter remains the same, the basis weight will decrease, resulting in the kitchen towel sheet 1x having a lower water absorption capacity.

[0025] The roll length is measured as follows: First, measure the length of 10 kitchen towel sheets 1x between the perforations on kitchen towel roll 1. Next, measure the number of sheets on kitchen towel roll 1, and calculate the roll length proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80 m and there are 150 sheets, the roll length is 1.80 m x (150 / 10) = 27 m. Note that if kitchen towel roll 1 does not have perforations, measure the roll length.

[0026] The lower limit of the roll diameter DR of the kitchen towel roll 1 according to this embodiment is preferably 130 mm or more, more preferably 135 mm or more, and even more preferably 142 mm or more, and the upper limit is preferably 170 mm or less, more preferably 165 mm or less, and even more preferably 156 mm or less. If the roll diameter DR is less than 130 mm, the basis weight will decrease if the roll length remains the same, resulting in a decrease in the water absorption capacity of the kitchen towel sheet 1x. If the roll diameter DR is more than 170 mm, the roll density will decrease if the roll length remains the same, resulting in the kitchen towel sheet 1x becoming more prone to wrinkling.

[0027] The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Three kitchen towel rolls 1 are measured and the measurement results are averaged.

[0028] (sheet width and roll mass) The sheet width (hereinafter also referred to as roll width) of the kitchen towel roll 1 preferably has a lower limit of 260 mm or more, more preferably 270 mm or more, and even more preferably 275 mm or more, and preferably has an upper limit of 300 mm or less, more preferably 290 mm or less, and even more preferably 286 mm or less. If the sheet width is less than 260 mm, the frequency of cutting with a log saw increases during the manufacturing process, making it more likely to produce paper dust.If the sheet width exceeds 300 mm, the surface area subjected to external forces during the manufacturing process increases, making it more likely to wrinkle.

[0029] The lower limit of the roll mass of the kitchen towel roll 1 is preferably 290 g or more, more preferably 310 g or more, and even more preferably 320 g or more, and the upper limit is preferably 510 g or less, more preferably 450 g or less, and even more preferably 420 g or less. If the roll weight is less than 290g, and the roll length remains the same, the basis weight of the kitchen towel sheet 1x will be lower, making it more prone to wrinkling. If the roll weight is more than 510g, and the roll length remains the same, the basis weight of the kitchen towel sheet 1x will be higher, making it less soft to the touch.

[0030] The roll mass is the mass per 280mm sheet width, excluding the paper tube 2 (core) of the kitchen towel roll 1. If the sheet width is not 280mm, convert it to the mass per 280mm by proportional calculation.

[0031] (roll density) The roll density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.04 g / cm 3 It is preferable that the concentration is 0.05 g / cm or more. 3 More preferably, it is 0.06 g / cm or more. 3 The upper limit is more preferably 0.12 g / cm. 3 Preferably, it is 0.11 g / cm or less. 3 More preferably, it is 0.10 g / cm or less. 3 It is more preferable that: Roll density is 0.04g / cm 3 If the roll density is less than 0.12 g / cm, the volume of the kitchen towel roll 1 will not change, but the basis weight of the kitchen towel sheet 1x will be lower, making it more likely to wrinkle. 3 If the volume of the kitchen towel roll 1 does not change, the basis weight of the kitchen towel sheet 1x will increase instead, resulting in a poor texture.

[0032] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of a kitchen towel roll 1 per 280 mm of sheet width. Roll volume is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter DR)} - (cross-sectional area of ​​the core's outer diameter DI)] × sheet width (converted per 280 mm). For example, if the roll mass (excluding the core) per 280 mm of sheet width is 382 g, the winding diameter DR is 150 mm, and the core's 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:

[0033] (winding density) The winding density of the kitchen towel roll 1 according to this embodiment is 0.28 m / cm 2 More than 0.43m / cm 2 The winding density is 0.28m / cm 2 If the winding density is less than 0.43 m / cm, the kitchen towel roll 1 will be loosely wound, and as a result, the kitchen towel sheet 1x will be prone to wrinkles. 2 If the tension exceeds this value, the kitchen towel roll 1 will be pulled to make it tightly wound, resulting in a decrease in the paper thickness of the kitchen towel sheet 1x and a decrease in water absorption. The winding density of the kitchen towel roll 1 has a lower limit of 0.30 m / cm 2 It is preferable that the thickness is 0.32 m / cm or more. 2 The upper limit is more preferably 0.41 m / cm. 2 Preferably, it is 0.39 m / cm or less. 2 More preferably, it is:

[0034] The winding density is expressed as (winding length x number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll outer diameter (winding diameter DR) - (cross-sectional area of ​​the core outer diameter DI)}. For example, in the case of a winding length of 27 m, 2 plies, a winding diameter DR of 150 mm, and a core outer diameter DI of 39 mm, the winding density = (27 m x 2) ÷ {3.14 x (150 mm ÷ 2 ÷ 10)2 -3.14×(39mm÷2÷10) 2}=0.33m / cm 2 This becomes:

[0035] (Core outer diameter) The core outer diameter DI, which is the outer diameter of the core (paper tube 2) of the kitchen towel roll 1 of the present invention, is 20 mm or more and 60 mm or less. If the core outer diameter DI is less than 20 mm, the winding density will decrease if the winding diameter DR remains unchanged, resulting in the kitchen towel sheet 1x being more prone to wrinkling. If the core outer diameter DI is more than 60 mm, the winding density will increase if the winding diameter DR remains unchanged, resulting in a decrease in the water absorption capacity of the kitchen towel sheet 1x. The lower limit of the core outer diameter DI is preferably 30 mm or more, more preferably 38 mm or more, and the upper limit is preferably 55 mm or less, more preferably 50 mm or less.

[0036] The core outer diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Three kitchen towel rolls 1 are measured and the measurement results are averaged. If the core does not have a paper tube 2, the outer diameter of the hollow core portion is measured.

[0037] (core mass) Furthermore, the lower limit of the mass (core mass) of the paper core 2 of the kitchen towel roll 1 of the present invention is preferably 10 g or more, more preferably 12 g or more, and even more preferably 14 g or more. The upper limit is preferably 25 g or less, more preferably 20 g or less, and even more preferably 17 g or less. If the core mass is less than 10 g, the core is more likely to be crushed when the kitchen towel rolls 1 are stacked during packaging or transportation, making the kitchen towel sheet 1x more likely to wrinkle. If the core mass exceeds 25 g, more force is required to cut it with a log saw during production, making it more likely to produce paper dust. By having the core mass within the above numerical range, it is possible to produce a kitchen towel sheet 1x that is less likely to wrinkle during the manufacturing process while maintaining its texture and absorbency, and it is also possible to produce a kitchen towel roll 1 that can reduce the generation of paper dust.

[0038] The core mass of the kitchen towel roll 1 is the mass of the core (paper tube 2) per 280 mm of sheet width in the kitchen towel roll 1, and if the sheet width is not 280 mm, it is converted to the mass per 280 mm by proportional calculation. From the viewpoint of strength, the core cardboard tube 2 preferably contains bleached pulp (BKP). The content of BKP in the cardboard tube is preferably 50% or more, more preferably 70% or more, and even more preferably 90% or more. Similarly, from the viewpoint of strength, the content of LBKP in the BKP contained in the core cardboard tube 2 is preferably 50% or less, more preferably 70% or more, and even more preferably 90% or more.

[0039] <Kitchen towel sheet> The kitchen towel sheet 1x according to this embodiment preferably contains wet pulp. The wet pulp content is preferably 50% or more. If the wet pulp content is less than 50%, the water absorption capacity of the kitchen towel sheet 1x will decrease. There is no upper limit for the wet pulp content, but if it is too high, the strength of the kitchen towel sheet 1x will tend to increase, which may result in a poor texture. The wet pulp content in the kitchen towel sheet 1x is more preferably 70% or more, and even more preferably 90% or more.

[0040] In this case, kitchen towel sheet 1x is made by laminating sheets in two or three plies, and in each ply shown in Figure 2, the outer surface 1Aa of ply 1A on the surface side (corresponding to surface 1a in Figure 1) has a softwood bleached kraft pulp (NBKP) content of 60% to 100% by mass. If the content is less than 60% by mass, the kitchen towel sheet 1x is more likely to wrinkle during the manufacturing process and more likely to generate paper dust. The lower limit of the content of softwood bleached kraft pulp (NBKP) in the outer surface 1Aa of the surface-side ply 1A is preferably 70% by mass or more, and more preferably 80% by mass or more.

[0041] Furthermore, the softwood bleached kraft pulp (NBKP) content of the inner surface 1Ab of the surface ply 1A is 30% by mass or more and 80% by mass or less. If the content is less than 30% by mass, the inner surface 1Ab becomes too smooth, which makes ply peeling more likely, and the kitchen towel sheet 1x is more likely to wrinkle. If the content exceeds 80% by mass, the inner surface 1Ab becomes too rough, which makes it difficult for glue to adhere the ply, making ply peeling more likely, and the kitchen towel sheet 1x is more likely to wrinkle. The lower limit of the content of softwood bleached kraft pulp (NBKP) in the inner surface 1Ab of the surface ply 1A is preferably 40% by mass or more, more preferably 50% by mass or more. The upper limit is preferably 70% by mass or less, more preferably 60% by mass or less. In the surface ply 1A, the NBKP content in the outer surface 1Aa is preferably higher than the NBKP content in the inner surface 1Ab.

[0042] Furthermore, with regard to the content of softwood bleached kraft pulp (NBKP) in the outer surface 1Ba and the inner surface 1Bb of the back surface ply 1B (corresponding to the back surface 1b in Figure 1), it is preferable that the NBKP content of the outer surface 1Ba is higher than the NBKP content of the inner surface 1Bb. Although there are no particular limitations on the specific numerical value, the lower limit of the NBKP content of the outer surface 1Ba of the backside ply 1B is preferably 60 mass%, more preferably 70 mass% or more, and even more preferably 80 mass% or more, and the upper limit is preferably 100 mass% or less. Similarly, the lower limit of the NBKP content of the inner surface 1Bb of the backside ply 1B is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more, and the upper limit is preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 60% by mass or less.

[0043] When the kitchen towel sheet 1x is three-ply, the content of softwood bleached kraft pulp (NBKP) in the ply between the front ply 1A and the back ply 1B is not particularly limited, but it is preferably the same as that of the back ply 1B. The content of softwood bleached kraft pulp (NBKP) in each ply of the kitchen towel sheet 1x is measured in accordance with JIS P 8120 "Paper, paperboard and pulp - Testing method for fiber composition."

[0044] The method for measuring the content of bleached softwood kraft pulp (NBKP) will be explained below with reference to FIG. First, the kitchen towel roll 1 is unwound two or more times, and one kitchen towel sheet 1x is cut from it. Next, the two-ply or three-ply sheet is peeled off into one ply, exposing the outer surface 1Aa and inner surface 1Ab of the surface-side ply 1A shown in Figure 2. Next, two pieces of cut cellophane tape 2 are prepared and attached to the outer surface 1Aa and inner surface 1Ab so that they face each other (at this point, the dimensions of the cellophane tape 2 attached to the kitchen towel sheet 1x are both 22 x 32 mm).

[0045] Next, both of the opposing cellophane tapes 2 are peeled off, and the fibers 110 adhering to the outer surface 1Aa and the inner surface 1Ab are collected. Finally, as shown in Figure 3(b), cellophane tape 2 is fixed onto a slide glass 3 so that the collected fibers 110 are exposed, and the mass percentage of NBKP on each surface is calculated according to the C staining method (JIS P 8120).

[0046] In addition to NBKP, bleached hardwood kraft pulp (LBKP) can also be used as the pulp used throughout the kitchen towel sheet 1x. The preferred content ratio is NBKP:LBKP = 40-95% by mass:5-60% by mass. If the NBKP content is less than 40% by mass, the kitchen towel sheet 1x is more likely to wrinkle during the manufacturing process, and paper dust is also more likely to be generated. If the NBKP content exceeds 95% by mass, the texture of the resulting kitchen towel sheet 1x will be poor. The content ratio of NBKP to LBKP is more preferably NBKP:LBKP=45-90% by mass:10-55% by mass, and even more preferably NBKP:LBKP=50-80% by mass:20-50% by mass.

[0047] (Basic weight) The basis weight of one ply of kitchen towel sheet is 17.6 g / m 2 More than 26.5g / m 2 The basis weight per ply is 17.6 g / m 2 If the thickness is less than 26.5g / m², the strength of the kitchen towel sheet will decrease and it will be prone to wrinkling. 2 If you exceed this limit, the texture of the kitchen towel sheet will deteriorate. The minimum basis weight per ply of a kitchen towel sheet is 18.6 g / m 2 It is preferable that the content is 19.0 g / m or more. 2 The upper limit is more preferably 25.5 g / m or more. 2 Preferably, the content is 24.0 g / m or less. 2 It is more preferable that the basis weight per ply of the kitchen towel sheet 1x is equal to or less than 10 ...

[0048] (paper thickness) The paper thickness of the kitchen towel sheet 1x must be between 2.1mm / 10 ply and 4.5mm / 10 ply. If the paper thickness is less than 2.1mm / 10 ply, the absorbency of the kitchen towel sheet 1x will decrease if the basis weight remains the same. If the paper thickness exceeds 4.5mm / 10 ply, the kitchen towel sheet 1x will be too bulky and prone to paper dust. The paper thickness of the kitchen towel sheet 1x is preferably 2.3 mm / 10 plies or more, more preferably 2.6 mm / 10 plies or more, and is preferably 4.2 mm / 10 plies or less, more preferably 4.0 mm / 10 plies or less.

[0049] The thickness of a 1x kitchen towel sheet can be measured using a thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.) The measurement conditions are a 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 a 10-ply kitchen towel sheet (5 sets for 2-ply, 3 sets for 3-ply, and the values ​​are proportionally calculated to 10 plies). The measurement is repeated 10 times at different locations, and the average of the measurement results is used as the final thickness of the kitchen towel sheet.

[0050] (seat length) Furthermore, the sheet length between perforations in the kitchen towel sheet 1x (the length of the kitchen towel sheet 1x in the roll winding direction) preferably has a lower limit of 100 mm or more, more preferably 130 mm or more, and even more preferably 150 mm or more. The upper limit is preferably 250 mm or less, more preferably 220 mm or less, and even more preferably 210 mm or less. If the sheet length is less than 100 mm, the perforation blade will come into contact with the sheet more frequently during production, making it more likely to generate paper dust. If the sheet length exceeds 250 mm, the number of cuts per roll during production will be reduced, resulting in a high consumption rate and inferior quality. By ensuring that the sheet length is within the above numerical range, it is possible to produce a kitchen towel sheet 1x that is less likely to wrinkle during the manufacturing process while maintaining its texture and absorbency, and it is also possible to produce a kitchen towel roll 1 that can reduce the generation of paper dust.

[0051] (specific volume) And the specific volume of one kitchen towel sheet is 7cm 3 / g or more 23cm 3 / g or less. The specific volume of one kitchen towel sheet is 7cm 3 If the water absorption capacity of the kitchen towel sheet 1x is less than 23 cm / g, the water absorption capacity of the kitchen towel sheet 1x will be poor. 3 If the density exceeds / g, the strength of the kitchen towel sheet 1x will decrease and it will be more prone to wrinkling. The specific volume of one kitchen towel sheet is limited to 9 cm 3 / g or more is preferable, and 11cm 3 / g or more is more preferable. The upper limit is 22 cm 3 / g or less, and 3 The specific volume is calculated by dividing the paper thickness per ply of 1x kitchen towel sheet by the basis weight per ply (the paper thickness per product ply is the basis weight per product ply), and then calculating the volume (cm) per unit (g). 3 )

[0052] (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of the 2-ply or 3-ply kitchen towel sheet 1x, as measured in accordance with JIS P 8113, is preferably 1500 cN / 76 mm or more and 4200 cN / 76 mm or less. If the DMDT is less than 1500 cN / 76 mm, the kitchen towel sheet 1x is prone to wrinkling, resulting in a decrease in aesthetic appeal. If the DMDT exceeds 4200 cN / 76 mm, the texture of the kitchen towel sheet 1x deteriorates. The DMDT of the 2-ply or 3-ply kitchen towel sheet 1x preferably has a lower limit of 1834 cN / 76 mm or more, more preferably 2100 cN / 76 mm or more, and an upper limit of 3800 cN / 76 mm or less, more preferably 3500 cN / 76 mm or less.

[0053] Furthermore, the dry cross direction tensile strength (DCDT) of the kitchen towel sheet 1x in the dry state according to JIS P 8113 for the two-ply or three-ply structure is preferably 1400 cN / 76 mm or more and 4100 cN / 76 mm or less. If the DCDT is less than 1400 cN / 76 mm, the kitchen towel sheet 1x is prone to wrinkling, resulting in a decrease in aesthetic appeal. If the DCDT exceeds 4100 cN / 76 mm, the texture of the kitchen towel sheet 1x deteriorates. The DCDT of the 2-ply or 3-ply kitchen towel sheet 1x preferably has a lower limit of 1750 cN / 76 mm or more, more preferably 2000 cN / 76 mm or more, and an upper limit of 3700 cN / 76 mm or less, more preferably 3400 cN / 76 mm or less. DMDT and DCDT for 2-ply or 3-ply kitchen towel sheets 1x are measured in accordance with JIS P 8113. If the kitchen towel sheet 1x is 3-ply, the measurement is also performed in accordance with JIS P 8113, but the conditions are changed to 3-ply.

[0054] (Embossed) The kitchen towel roll 1 (kitchen towel sheet 1x) of this embodiment is embossed and has an embossed pattern 10. Furthermore, the kitchen towel sheet 1x of the present invention is embossed into at least one ply, which is then laminated to form two or three plies. When laminating two or three plies, it is preferable to use, for example, ply bond glue to apply the glue and perform the bonding process. By bonding the plies together to form two plies in this way, the plies are bonded together strongly, and even when the kitchen towel sheet 1x gets wet, the plies do not peel off and are less likely to tear. Furthermore, water may be used instead of ply bond glue, or a mixture of glue and water may be used. If the kitchen towel sheet 1x has fewer than two plies, it will be prone to wrinkles, reducing its aesthetic appeal. If the kitchen towel sheet 1x has more than three plies, the texture of the kitchen towel sheet 1x will deteriorate.

[0055] The ply on the surface 1a side of the kitchen towel sheet 1x preferably has an embossed pattern 10. By providing the embossed pattern 10 on the surface 1a side, glue can be applied to the embossed portion and two plies can be laminated together. If the kitchen towel sheet 1x does not have the embossed pattern 10, ply-bond glue will be applied to the entire sheet, which will deteriorate the texture of the kitchen towel sheet 1x.

[0056] FIG. 4 is a diagram showing an example of an embossed pattern 10 in the kitchen towel roll of this embodiment. It is preferable that the embossed pattern 10 includes radial embossments 11 and closed-ring structure embossments 12, and that the radial embossments 11 and the closed-ring structure embossments 12 are alternately arranged at equal intervals. By including the radial embossments 11 and the closed-ring structure embossments 12 in the embossed pattern 10, it is possible to obtain a kitchen towel sheet 1x that has excellent texture and water absorbency.

[0057] The overall shape of the radial embossments 11 is not particularly limited, but it is preferable that the embossments have a linear shape extending from the center to the outside or a plurality of linear embossments. When the embossing pattern 10 includes the radial embossments 11, the texture of the kitchen towel sheet 1x is improved. Like the radial embossments 11, the closed-ring structure embossments 12 are not particularly limited in overall shape, but preferably have a linear or geometric embossment in the center surrounded by a geometric embossment that forms a closed ring on the outside. The inclusion of the closed-ring structure embossments 12 in the embossing pattern 10 improves the water absorbency of the kitchen towel sheet 1x.

[0058] The embossed pattern 10 includes linear embossed portions 100, and the proportion of linear embossed portions 100 included in the embossed pattern 10 is preferably 20% or more. If the proportion is less than 20%, the embossed pattern 10 will not contribute to improving the texture and water absorbency, and the texture and water absorbency of the kitchen towel sheet 1x will be inferior. The proportion of the linear embossed portions 100 contained in the embossed pattern 10 is more preferably 50% or more, and even more preferably 90% or more.

[0059] In this case, the linear embossed portion 100 refers to an embossment having a thickness of 0.1 mm to 4 mm and a length of 5 mm or more. The proportion of the linear embossed portion 100 is determined as follows. First, any 100mm x 100mm area on the surface of the kitchen towel sheet 1x with the embossed pattern 10 is divided into 10mm squares. Then, the proportion of the linear embossed portion 100 is calculated using the following formula. Note that if a single square contains both linear embossing and dot embossing, the square with the larger embossing percentage is used. (Number of squares containing linear embossing / Number of squares containing any embossing) x 100 = Percentage of linear embossing in 100 (%)

[0060] The ply on the back surface 1b of the kitchen towel sheet 1x is not particularly limited as to whether it has the embossed pattern 10, as long as it has a concavo-convex pattern 13 derived from the papermaking process that is different from the embossed pattern 10 described below. Nested embossing or pin-to-pin embossing may be provided, or no embossing may be provided, but nested embossing or no embossing is preferred, and no embossing is more preferred. Furthermore, when the kitchen towel sheet 1x is three-ply, the ply between the ply on the front surface 1a side and the ply on the back surface 1b side may also be (have) an embossed pattern, but it is preferable that it not be.

[0061] (Water absorption) The water absorption per unit area of ​​the two plies of the kitchen towel sheet 1x according to this embodiment is 300 g / m 2 More than 690g / m 2 The water absorption per unit area is preferably 300 g / m or less. 2 If the thickness is less than 690g / m, the water absorption of the kitchen towel sheet will be poor. 2 If the volume exceeds this, the specific volume of one kitchen towel sheet will increase, resulting in a decrease in strength and a tendency to wrinkle. The minimum water absorption per unit area of ​​2 plies of one kitchen towel sheet is 350 g / m 2 More preferably, it is 400 g / m or more. 2 The upper limit is more preferably 680 g / m or more. 2 More preferably, it is 670 g / m or less. 2 It is more preferable that:

[0062] Furthermore, the water absorption per unit mass of the two plies of the kitchen towel sheet 1x is preferably 8 g / g or more and 20 g / g or less. If the water absorption per unit mass is less than 8 g / g, the water absorption of the kitchen towel sheet 1x will be poor. If the water absorption per unit mass is more than 20 g / g, the specific volume of the kitchen towel sheet 1x will increase, resulting in a decrease in strength and a tendency to wrinkle. The water absorption per unit mass of the two plies of the kitchen towel sheet 1x preferably has a lower limit of 9 g / g or more, more preferably 10 g / g or more, and an upper limit of 18 g / g or less, more preferably 16 g / g or less.

[0063] The method for measuring the water absorption of each kitchen towel sheet 1x will be described below with reference to FIG. First, a two-ply kitchen towel sheet 1x is taken and cut using a square template with each side measuring 7.6 cm to prepare a rectangular test piece 20 with each side measuring 7.6 cm. The mass of the test piece 20 before water absorption is measured using an electronic balance. The test piece 20 is set in a holder 21 (a jig that fixes three points of the test piece, made of a metal that does not absorb water).

[0064] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 20 set in the holder 21 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 20 is removed from the distilled water together with the holder 21, and as shown in Figure 5, the holder 21 and the test piece 20 are hung from a rod placed in an empty water tank with the corner 20a facing up, and the lid of the water tank is closed and left for 5 minutes.

[0065] Thereafter, the holder 21 and the test piece 20 are taken out of the water tank, the holder 21 is removed, and the mass of the test piece 20 is measured with an electronic balance. From the change in mass of the test piece 20 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 20 (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 m2 ) by the basis weight of the product ply of the test piece 20 to obtain the water absorption per unit area (water g / sheet m 2 ) / basis weight (sheet g / sheet m 2 ) = Water absorption per unit mass (g of water / g of sheet, per 1g. Abbreviated as g / g). Measurements are carried out five times for each sample, and the average value is used.

[0066] When the kitchen towel sheet 1x is 3-ply, it is preferable to measure it in the same manner as when it is 2-ply. 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.

[0067] <Kitchen towel roll manufacturing method> The kitchen towel roll 1 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing and bonding (laminating), and (3) roll winding. Note that the TAD papermaking method is preferably used in the manufacturing (papermaking) process of the kitchen towel sheet 1x.

[0068] At this time, in the papermaking process, it is preferable that a concave-convex pattern 13 derived from the papermaking process (fabric), different from the above-mentioned embossed pattern 10, is applied to the kitchen towel sheet 1x as shown in Figure 4. By having this concave-convex pattern, the water absorption capacity of the kitchen towel sheet 1x can be further increased.

[0069] Note that "originating from the papermaking process" means that in the papermaking process for the kitchen towel sheet 1x, an uneven pattern is imparted between the head box 41 of the papermaking machine and the outlet of the Yankee dryer 46. Specifically, in a part of the papermaking process shown in Figure 6, a paper web 40a in a pulp slurry state is sprayed (supplied) from the head box 41 to between a first fabric (forming fabric) 42 and a second fabric (uneven fabric) 43, and is pulled onto the second fabric (uneven fabric) 43 by a forming roll 44, forming a paper web 40b in a wet paper state. Next, the wet paper web 40b is dried together with the second fabric (concave-convex fabric) 43 in a through-air dryer 45, resulting in the formation of concave-convex patterns on the dried sheet paper web 40c. Although two through-air dryers 45 are shown in FIG. 5, a single unit may be used. Although a Yankee hood is shown on the Yankee dryer 46, the hood need not be provided. Creping may be performed in the Yankee dryer 46.

[0070] Furthermore, the uneven pattern 13 can be changed as needed by changing the patterns (fine pattern, coarse pattern) of the first fabric 42 and the second fabric 43. Changing the uneven pattern changes the specific volume (paper thickness), but it is preferable to select a pattern that will bring the specific volume in the rolled state within the above-mentioned numerical range. In each ply of the kitchen towel sheet 1x shown in Figures 1 and 2, it is preferable that the TAD papermaking method is used for both the front surface 1a and the back surface 1b, and that both the front surface ply 1A and the back surface ply 1B have an uneven pattern derived from the papermaking process.

[0071] As described above, according to this embodiment, it is possible to provide a kitchen towel roll that can be made into a sheet that is less likely to wrinkle during use or manufacturing while maintaining its texture and absorbency, and that can also suppress the generation of paper dust.

[0072] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention. [Example]

[0073] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples shown below.

[0074] The kitchen towel rolls of Examples 1 to 14 and Comparative Examples 1 to 5 shown in Tables 2 and 3 were manufactured through the following steps: (1) papermaking and creping, (2) embossing and bonding (laminating), and (3) roll winding. The kitchen towel rolls of all Examples and Comparative Examples were measured for the above-mentioned parameters and evaluated as follows: For each of the following evaluations, 1 point was considered a failure and 2 points or more was considered a pass. Furthermore, each parameter other than the following evaluations was measured according to the standards or measurement methods described above.

[0075] 1. Wrinkle resistance during use and manufacturing (cosmetic properties) The aesthetic appeal of the kitchen towel sheets cut from the kitchen towel rolls during and after production was evaluated by 30 panelists, who rated them on a four-point scale based on the number of people who felt that the sheets were wrinkled. The evaluation criteria were as follows: 4: 0-1 people felt that the seat was wrinkled 3: 2-4 people felt that the seat was wrinkled 2: 5-7 people felt that the seat was wrinkled 1: Eight or more people felt that the seat was wrinkled

[0076] 2. Less generation of paper dust during manufacturing (operability) The resistance to paper dust generation during the production of kitchen towel rolls was evaluated by a single monitor using a sensory evaluation system on a four-point scale. The evaluation criteria are as follows: 4: I felt that "almost no paper dust is generated during manufacturing." 3: "It seems that paper dust is less likely to be generated during manufacturing." 2: "Paper dust tends to be generated during manufacturing." 1: I felt that paper dust was easily generated during manufacturing.

[0077] 3. The texture of the kitchen towel sheet The texture of the manufactured kitchen towel sheets was evaluated by 30 panelists when held in the hand, and the number of people who felt that the texture of the sheet was poor was rated on a 4-point scale. The evaluation criteria were as follows: 4: 0-1 people felt that the seat had poor texture 3: 2-4 people felt that the seat had poor texture 2: 5-7 people felt that the seat had poor texture. 1: Eight or more people felt that the seat had poor texture

[0078] 4. Kitchen towel sheet absorbency The water absorbency of the produced kitchen towel sheets was evaluated sensorily based on the amount of water absorbed per unit area, and the evaluation was made on a four-point scale according to the numerical value of the amount of water absorbed per unit area. The evaluation criteria are shown in Table 1 below. [Table 1]

[0079] [Table 2]

[0080] [Table 3]

[0081] As is clear from the results shown in Tables 2 and 3, the kitchen towel rolls of Examples 1 to 14 were less likely to wrinkle or generate paper dust during use or production, and had good texture and water absorbency. In contrast, Comparative Examples 1 to 5 were all poor in either the resistance to wrinkles or paper dust during use or production, or the texture and water absorbency of the sheets. Therefore, it has been confirmed that the kitchen towel roll of the present invention can be made into a sheet that is less likely to wrinkle during use or manufacturing while maintaining its texture and water absorbency, and can also provide a kitchen towel roll that can suppress the generation of paper dust. [Explanation of symbols]

[0082] 1 kitchen towel roll 1a surface 1A Surface ply 1Aa, 1Ba external surface 1b back side 1B Back side ply 1Ab, 1Bb inner surface 1e The outermost edge of a kitchen towel roll 1x kitchen towel sheet 2 cellophane tape 3. Glass slides 10 Embossing Pattern 11 Radial Embossing 12 Closed ring structure embossing 13 Concave and Convex Pattern 20 test specimens 20a Corner 21 Holder 40a, 40b, 40c Paper Web 41 Headbox 42, 43 Fabric 44 Forming roll 45 Through Air Dryer 46 Yankee Dryer 100 Linear embossed part 110 Fiber

Claims

1. A kitchen towel roll is a kitchen towel sheet formed by laminating two or three plies of a sheet having an embossed pattern on at least one ply, the kitchen towel sheet being wound into a roll. The winding density of the kitchen towel roll is 0.28 m / cm ２ 0.43m / cm or more ２ Hereinafter, the core outer diameter is 20 mm or more and 60 mm or less, The kitchen towel sheet has a basis weight per ply of 17.6 g / m ２ 26.5g / m or more ２ The following: Paper thickness is 2.1 mm / 10 plies or more and 4.5 mm / 10 plies or less, specific volume is 7 cm ３ / g or more 23cm ３ / g or less, The kitchen towel roll is characterized in that the content of softwood bleached kraft pulp (NBKP) on the outer surface of the ply on the surface side of the kitchen towel sheet is 60% by mass or more and 100% by mass or less, and the content of softwood bleached kraft pulp (NBKP) on the inner surface of the ply on the surface side is 30% by mass or more and 80% by mass or less.

2. The water absorption per unit area of ​​the two plies of the kitchen towel sheet is 300 g / m ２ 690g / m or more ２ 2. The kitchen towel roll of claim 1, wherein:

3. 3. The kitchen towel roll according to claim 1, wherein the content ratio of the NBKP and the hardwood bleached kraft pulp (LBKP) in the entire kitchen towel sheet is NBKP:LBKP = 40 to 95% by mass: 5 to 60% by mass.

4. 3. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a tensile strength in the machine direction (DMDT) of 1500 cN / 76 mm or more and 4200 cN / 76 mm or less in accordance with JIS P 8113 when dry for two or three plies, and a tensile strength in the CD direction (DCDT) of 1400 cN / 76 mm or more and 4100 cN / 76 mm or less in accordance with JIS P 8113 when dry for two or three plies.

5. 3. The kitchen towel roll according to claim 1, wherein the water absorption per unit mass of the two plies of the kitchen towel sheet is 8 g / g or more and 20 g / g or less.

Images