Kitchen towel roll

Abstract

To provide a kitchen towel roll manufactured at a low raw material cost (manufacturing cost), having a further soft texture, less likely to tear and having good operability.SOLUTION: There is provided a kitchen towel roll formed by winding a kitchen towel sheet, in which the kitchen towel roll has a roll density of 0.28 m / cm2 or more and 0.43 m / cm2 or less, a core outer diameter of 20 mm or more and 60 mm or less, a basis weight per ply of the kitchen towel sheet of 17.6 g / m2 or more and 26.5 g / m2 or less, a paper thickness of 2.1 mm / 10 plies or more and 4.5 mm / 10 plies or less, a specific volume of 7 cm3 / g or more and 23 cm3 / g or less, an NBKP content on an outer surface of a front-side ply of 60 mass% or more and 100 mass% or less, and an NBKP content on an inner surface of 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, soft to the touch, and have excellent water absorbency.

[0005] Because kitchen towel sheets made using TAD papermaking technology have the advantages described above, some 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 pattern of protrusions and recesses 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] In order to make kitchen towel sheets at lower cost (lower raw material costs) and with an even softer texture, it is possible to consider: 1. Using more hardwood bleached kraft pulp (LBKP), which has short, flexible fibers, and 2. Reducing (lowering) the strength of the sheet.

[0009] However, if the blending ratio of LBKP is increased throughout the sheet (i.e., the blending ratio of long-fiber softwood bleached kraft pulp (NBKP) is reduced), paper dust is more likely to be generated, reducing operational efficiency due to the need for cleaning. As a result, production volume decreases, ultimately resulting in increased costs. Furthermore, if the strength of the sheet is reduced, the kitchen towel sheet itself becomes more prone to tearing, resulting in poor quality.

[0010] The present invention has been made in consideration of these circumstances, and aims to provide a kitchen towel roll that has a softer texture, is less likely to tear, and has good operability, all at low raw material costs (manufacturing costs). [Means for solving the problem]

[0011] The inventors conducted extensive research and discovered that, in a kitchen towel roll formed by laminating two or three plies of a kitchen towel sheet, at least one of which has an embossed pattern, the winding length, winding diameter, 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, can be set within predetermined numerical ranges, and the NBKP content of each of the outer and inner plies on the surface side of the kitchen towel sheet can be set within predetermined numerical ranges, thereby achieving a kitchen towel roll that has a softer texture, is less likely to tear, and has good operability, all at low raw material costs (manufacturing costs), and has thereby been able to solve the above-mentioned problems, leading to the completion of the present invention. Specifically, the present invention provides the following.

[0012] (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 roll length of 18 m to 45 m, a roll diameter of 130 mm to 170 mm, and a roll density of 0.28 m / cm. 2 More than 0.43m / cm 2 The following are kitchen towel sheets with a core outer diameter of 20 mm or more and 60 mm or less, and a basis weight per ply of 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 content of softwood bleached kraft pulp (NBKP) on the inner 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 outer surface of the ply on the surface side of the kitchen towel sheet is 30% by mass or more and 80% by mass or less.

[0013] (2) A second aspect of the present invention is the kitchen towel roll described in (1), 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.

[0014] (3) A third 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 5200 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 5100 cN / 76 mm or less.

[0015] (4) A fourth aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein the water absorption per unit area of ​​the kitchen towel sheet in two or three plies is 300 g / m 2 More than 690g / m 2 It is characterized by the following:

[0016] (5) The 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 kitchen towel sheet in two or three plies is 8 g / g or more and 20 g / g or less. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a kitchen towel roll that has a softer texture, is less likely to tear, and has good operability, all at low raw material costs (manufacturing costs). [Brief explanation of the drawings]

[0018] [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 fiber composition of NBKP 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

[0019] 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.

[0020] 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).

[0021] <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 roll 1 wound into a roll from a kitchen towel sheet 1x, which is made by laminating two plies of sheets, at least the front ply of which has an embossed pattern 10. Preferably, the kitchen towel sheet 1x has perforations in the sheet width direction at approximately equal intervals in the rolling direction (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.

[0022] 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.

[0023] (winding length and winding diameter) The roll length of the kitchen towel roll 1 is between 18 m and 45 m. If the roll length is less than 18 m, the number of kitchen towel rolls 1 produced per unit time increases, which in turn increases the frequency of transfers (beginning and end of roll), making paper dust more likely to be generated. If the roll length exceeds 45 m, and the roll diameter DR remains the same, the basis weight decreases, making the kitchen towel sheet 1x more likely to tear during roll-up. The lower limit of the roll length of the kitchen towel roll 1 is preferably 22 m or more, more preferably 27 m or more, and the upper limit is preferably 40 m or less, more preferably 31 m or less.

[0024] 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.

[0025] The roll diameter DR of the kitchen towel roll 1 according to this embodiment is 130 mm or more and 170 mm or less. If the roll diameter DR is less than 130 mm, the basis weight decreases, making the kitchen towel sheet 1x more likely to tear. If the roll diameter DR exceeds 170 mm, the area cut with a log saw during the manufacturing process increases, making paper dust more likely to be produced. The lower limit of the roll diameter DR of the kitchen towel roll 1 is preferably 135 mm or more, more preferably 142 mm or more, and the upper limit is preferably 165 mm or less, more preferably 156 mm or less.

[0026] 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.

[0027] (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 200 mm or more, more preferably 220 mm or more, and even more preferably 260 mm or more, and preferably has an upper limit of 320 mm or less, more preferably 305 mm or less, and even more preferably 290 mm or less. If the sheet width is less than 200 mm, the frequency of cutting with a log saw increases during the manufacturing process, resulting in paper dust.If the sheet width exceeds 320 mm, the number of logs produced decreases, resulting in higher costs.

[0028] 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 decrease, making it weaker and more prone to tearing. 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 increase, making it less soft to the touch.

[0029] The roll mass is the mass per 280mm sheet width, excluding the paper tube (core) of kitchen towel roll 1. If the sheet width is not 280mm, convert to the mass per 280mm using a proportional calculation.

[0030] (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 remain the same, but the basis weight of the kitchen towel sheet 1x will decrease, resulting in a decrease in strength and making the sheet more likely to tear. 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.

[0031] 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:

[0032] (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 0.43m / cm, the winding diameter DR will increase instead if the winding length remains the same, and the area to be cut with a log saw during the manufacturing process will increase, resulting in paper dust being more likely to be produced. 2 If the tension exceeds this value, the kitchen towel roll 1 will be pulled to make it tightly wound, which will result in the kitchen towel sheet 1x becoming more prone to tearing. 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:

[0033] 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:

[0034] (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 and the reel diameter DR remains unchanged, the area cut with a log saw during the manufacturing process increases, resulting in more paper dust. If the core outer diameter DI exceeds 60 mm and the reel diameter DR remains unchanged, the basis weight decreases, resulting in the kitchen towel sheet 1x being more likely to tear during reeling. 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.

[0035] 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.

[0036] (core mass) The core mass, which is the mass of the paper tube 2 of the kitchen towel roll 1 of the present invention, has a lower limit of preferably 10 g or more, more preferably 12 g or more, and even more preferably 14 g or more, and an upper limit of preferably 25 g or less, more preferably 20 g or less, and even more preferably 17 g or less. By having the core mass within the above numerical range, it is possible to produce a kitchen towel sheet 1x and a kitchen towel roll 1 that have a softer texture, are less likely to tear, and have good operability, with low raw material costs (manufacturing costs).

[0037] 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. Furthermore, from the viewpoint of raw material costs (manufacturing costs), the content of LBKP in the BKP contained in the core cardboard tube 2 is preferably 50% or more, more preferably 70% or more, and even more preferably 90% or more.

[0038] <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.

[0039] 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 content of softwood bleached kraft pulp (NBKP) in inner surface 1Ab of surface ply 1A (corresponding to surface 1a in Figure 1) is 60% by mass or more and 100% by mass or less. If the content is less than 60% by mass, inner surface 1Ab becomes too smooth and ply peeling easily occurs, resulting in a tendency for the sheet to become one-ply during use, which reduces the strength of kitchen towel sheet 1x and makes it more likely to tear. The lower limit of the content of softwood bleached kraft pulp (NBKP) in the inner surface 1Ab of the surface-side ply 1A is preferably 70% by mass or more, and more preferably 80% by mass or more.

[0040] The outer surface 1Aa of the surface ply 1A contains softwood bleached kraft pulp (NBKP) at a content of 30% to 80% by mass. If the content is less than 30% by mass, paper dust is likely to be generated during the manufacturing process. If the content exceeds 80% by mass, the texture of the kitchen towel sheet 1x will deteriorate. 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 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 addition, the NBKP content of the inner surface 1Ab of the surface-side ply 1A is preferably higher than the NBKP content of the outer surface 1Aa.

[0041] 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 inner surface 1Bb is higher than the NBKP content of the outer surface 1Ba. Although there are no particular limitations on the specific numerical value, the lower limit of the NBKP content of the inner surface 1Bb 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 outer surface 1Ba 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.

[0042] When the kitchen towel sheet 1x has three plies, 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 preferable that it be the same as that of the ply between 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."

[0043] The method for measuring the content of softwood bleached 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 facing each other, as shown in Figure 3(a) (at this point, the dimensions of each piece of cellophane tape 2 attached to the kitchen towel sheet 1x should be 22 x 32 mm).

[0044] 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).

[0045] In addition, the pulp used throughout the kitchen towel sheet 1x may be, for example, bleached hardwood kraft pulp (LBKP) or the like, in addition to NBKP. 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, paper dust is likely to be generated during the manufacturing process, and the manufactured kitchen towel sheet 1x is likely to tear. If the NBKP content exceeds 95% by mass, raw material costs (manufacturing costs) will increase. 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.

[0046] (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 ply weight is less than 26.5 g / m², the strength of the kitchen towel sheet will decrease and it will be easily torn. 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 weight is 24.0 g / m or less. 2It is more preferable that the basis weight per ply of the kitchen towel sheet 1x is equal to or less than 10 ...

[0047] (paper thickness) The thickness of the kitchen towel sheet 1x is between 2.1mm / 10 ply and 4.5mm / 10 ply. If the thickness is less than 2.1mm / 10 ply, the texture of the kitchen towel sheet 1x will deteriorate. If the thickness is more than 4.5mm / 10 ply, the strength of the kitchen towel sheet 1x will decrease and it will be more likely to tear. 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.

[0048] 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.

[0049] (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) has a lower limit of preferably 100 mm or more, more preferably 130 mm or more, and even more preferably 150 mm or more, and an upper limit of 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 comes into contact with the sheet more frequently during production, which makes it more likely to generate paper dust.If the sheet length is more than 250 mm, the number of cuts per roll (number of sheets) during production decreases, and the sheet is consumed quickly, resulting in poor quality and poor usability.

[0050] (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 specific volume of the kitchen towel sheet 1x is less than 23 cm3 / g, the texture of the kitchen towel sheet 1x will be poor. 3 If the density exceeds / g, the strength of the kitchen towel sheet will decrease and it will be more likely to tear. 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 )

[0051] (DMDT and DCDT) The tensile strength in the dry machine direction (DMDT) of the two-ply or three-ply kitchen towel sheet 1x according to JIS P 8113 is preferably 1500 cN / 76 mm or more and 5200 cN / 76 mm or less. If the DMDT is less than 1500 cN / 76 mm, the strength of the kitchen towel sheet 1x decreases and it becomes more prone to tearing. If the DMDT exceeds 5200 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 4000 cN / 76 mm or less, more preferably 3500 cN / 76 mm or less.

[0052] 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 5100 cN / 76 mm or less. If the DCDT is less than 1400 cN / 76 mm, the strength of the kitchen towel sheet 1x decreases and it becomes more prone to tearing. If the DCDT exceeds 5100 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 3900 cN / 76 mm or less, more preferably 3500 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 similarly performed in accordance with JIS P 8113, except that the conditions are changed to 3-ply and the sheet is measured as is.

[0053] (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, the strength of the kitchen towel sheet 1x will decrease and it will be more likely to tear. If the kitchen towel sheet 1x has more than three plies, the texture of the kitchen towel sheet 1x will deteriorate.

[0054] 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.

[0055] 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.

[0056] 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 embossments in a shape made up of straight lines. 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.

[0057] 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.

[0058] 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 (%)

[0059] 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; however, 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.

[0060] (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 paper thickness will be lowered instead of the basis weight of the kitchen towel sheet 1x, resulting in a poor texture, and if the paper thickness is not changed, the basis weight will be lowered instead, resulting in a tendency to tear. 2 If it exceeds this value, the specific volume of one kitchen towel sheet will be higher, making it more likely to tear. 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:

[0061] Furthermore, the water absorption per unit mass of the two-ply 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 paper thickness will be reduced if the basis weight of the kitchen towel sheet 1x remains unchanged, resulting in a poor texture. If the paper thickness remains unchanged, the basis weight will be reduced, resulting in a tendency to tear. If the water absorption per unit mass exceeds 20 g / g, the specific volume of the kitchen towel sheet 1x will increase, making it more prone to tear. 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.

[0062] The method for measuring the water absorption of each of the kitchen towel sheets 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).

[0063] 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.

[0064] 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 / m2 ) 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 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.

[0065] In addition, even if the kitchen towel sheet 1x is a 3-ply, it is preferable to measure it as a 3-ply sheet using the same procedure as for the 2-ply sheet. This measurement is carried out in accordance with JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0066] <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.

[0067] 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.

[0068] 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. 6, 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.

[0069] 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.

[0070] As described above, according to this embodiment, it is possible to provide a kitchen towel roll that has a softer texture, is less likely to tear, and has good operability, all at low raw material costs (manufacturing costs).

[0071] 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]

[0072] 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.

[0073] 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.

[0074] 1. Kitchen towel sheets are tear-resistant The tear resistance of the manufactured kitchen towel sheets was evaluated based on the basis weight per ply and the NBKP content on the inner surface of the surface ply, and was rated on a four-point scale based on the basis weight and NBKP content values. The evaluation criteria are shown in Table 1 below. [Table 1]

[0075] 2. Less generation of paper dust during the manufacturing process (operability) The degree to which paper dust is not generated during the production of kitchen towel rolls was evaluated on a four-point scale, based on the following criteria: 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.

[0076] 3. The texture of the kitchen towel sheet The texture of the manufactured kitchen towel sheets was evaluated by 30 panelists when they were held in their hands, and the number of people who felt that the texture of the sheets 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

[0077] 4. Kitchen towel roll manufacturing cost The manufacturing cost of the kitchen towel roll was evaluated on a four-point scale based on the overall NBKP content of one kitchen towel sheet. The evaluation criteria were as follows: 4: The total NBKP content of one kitchen towel sheet is 80% by mass or less 3: The total NBKP content of one kitchen towel sheet is more than 80% by mass and less than 90% by mass. 2: The total NBKP content of one kitchen towel sheet is more than 90% by mass and less than 95% by mass. 1: The total NBKP content of 1 kitchen towel sheet exceeds 95% by mass

[0078] [Table 2]

[0079] [Table 3]

[0080] 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 generate paper dust during production, had reduced production costs, and had good tear resistance and texture for the kitchen towel sheets. In contrast, Comparative Examples 1 to 5 were all inferior in either the resistance to paper dust generation during production, production costs, or tear resistance and texture of the sheets. Therefore, it has been confirmed that the kitchen towel roll of the present invention can provide a kitchen towel roll that has a softer texture, is less likely to tear, and has good operability, all at low raw material costs (manufacturing costs). [Explanation of symbols]

[0081] 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 kitchen towel roll has a roll length of 18 m or more and 45 m or less, a roll diameter of 130 mm or more and 170 mm or less, and a roll density of 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 inner 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 outer surface of the ply on the surface side is 30% by mass or more and 80% by mass or less.

2. 2. 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.

3. 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 5200 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 5100 cN / 76 mm or less in accordance with JIS P 8113 when dry for two or three plies.

4. The water absorption per unit area of ​​the kitchen towel sheet in two or three plies is 300 g / m ２ 690g / m or more ２ 3. The kitchen towel roll according to claim 1 or 2, characterized in that:

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

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