Kitchen towel roll

Abstract

To provide a kitchen towel roll which is excellent in water absorbency, has embossing excellent in design, and is hardly wrinkled during processing.SOLUTION: Provided is a kitchen towel roll, which is obtained by winding up a kitchen towel sheet in a roll, the kitchen towel sheet being formed by laminating two plies of sheets each having an embossed pattern on at least the front ply, wherein the embossed pattern has two or more types of patterns arranged at a regular interval, the arrangement angle between adjacent identical patterns is 20° or more and 80° or less in the CD direction of the kitchen towel sheet, and the roll density is 0.04 g / cm3 or more and 0.13 g / cm3 or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a kitchen towel roll containing an embossed pattern. [Background technology]

[0002] In recent years, various kitchen towel sheets and kitchen towel rolls made by rolling up sheets have been developed and sold. Kitchen towel sheets are required to be soft and absorbent, and Patent Document 1, for example, discloses a through-air-dried (TAD) absorbent towel paper web.

[0003] TAD kitchen towel rolls are known for their bulk and excellent absorbency, but if they are wound loosely enough to ensure the bulk, the kitchen towel sheet will wrinkle during processing. To prevent wrinkles, increasing the tension or tightening the roll creates the problem of compromising the bulkiness that is unique to TAD.

[0004] Furthermore, if the embossed concave-convex pattern is aligned parallel to the width direction (CD) of the kitchen towel sheet, it becomes even more prone to wrinkling during processing. Furthermore, if the sheet is not embossed, the design of the kitchen towel sheet will be inferior.

[0005] As described above, it has been difficult to provide a kitchen towel roll made of TAD, which has excellent water absorption properties, that has an embossed design and is resistant to wrinkling during processing. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Publication No. 2024-16101 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above circumstances, and aims to provide a kitchen towel roll that has excellent water absorption properties, has embossing with excellent design, and is less likely to wrinkle during processing. [Means for solving the problem]

[0008] The inventors have conducted extensive research and have found that the above-mentioned problems can be solved by specifying the arrangement conditions of the embossed patterns and the roll density in a kitchen towel roll made by winding up a kitchen towel sheet consisting of two plies of sheets, at least the front ply of which has an embossed pattern. This has led to the completion of the present invention.

[0009] (1) The first aspect of the present invention is a kitchen towel roll obtained by laminating two plies of a kitchen towel sheet, at least one of which has an embossed pattern on the front side thereof, and winding the laminated sheet into a roll. The embossed patterns are arranged in a pattern of two or more types at regular intervals, and the arrangement angle between adjacent identical patterns is 20° or more and 80° or less with respect to the CD direction of the kitchen towel sheet. The roll density is 0.04 g / cm. 3 More than 0.13g / cm 3 A kitchen towel roll characterized by the following:

[0010] (2) A second aspect of the present invention is a kitchen towel roll according to (1), characterized in that the kitchen towel sheet has an uneven pattern resulting from the papermaking process that is different from the embossed pattern.

[0011] (3) A third aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the elongation rate of the kitchen towel sheet in the MD direction is 10% or more and 22% or less.

[0012] (4) A fourth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the thickness of the kitchen towel sheet per two plies is 0.35 mm or more and 0.80 mm or less.

[0013] (5) A fifth 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 is 240 g / m 2 More than 610g / m 2 It is characterized by the following:

[0014] (6) The sixth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the embossing pattern includes radial embossings and closed-ring structure embossings, and the radial embossings and the closed-ring structure embossings are alternately arranged at equal intervals.

[0015] (7) The seventh aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the proportion of linear embossed portions contained in the embossed pattern is 20% or more. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a kitchen towel roll that has excellent water absorption and embossing with excellent design, yet is resistant to wrinkling during processing. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing an example of an embossing pattern in a kitchen towel roll of the present invention. [Figure 3] FIG. 1 is a diagram showing an example of a radial embossing and a closed-ring structure embossing of an embossing pattern in a kitchen towel roll of the present invention. [Figure 4]FIG. 1 is a diagram showing a method for measuring the arrangement angle of the embossed pattern 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

[0018] 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.

[0019] In this specification, the MD (Machine Direction) direction of a kitchen towel sheet refers to the flow direction when the kitchen towel sheet is made (the Y direction shown in Figure 1), and the CD (Cross Direction) direction refers to the direction perpendicular to the MD direction (the X direction shown in Figure 1).

[0020] <Kitchen towel roll> Figure 1 is a perspective view of a kitchen towel roll 1 according to one embodiment of the present invention. As shown in Figure 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 applied thereto. Preferably, the kitchen towel sheet 1x has perforations 1c formed in the width direction of the roll at approximately equal intervals in the winding direction of the roll.

[0021] 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] (Volume length) The lower limit of the winding length of the kitchen towel roll 1 is preferably 18 m or more, more preferably 20 m or more, and even more preferably 24 m or more. The upper limit of the winding length is preferably 45 m or less, more preferably 40 m or less, and even more preferably 35 m or less. If the winding length is less than 18 m, the winding density decreases and the sheet is more likely to wrinkle during processing. If the winding length exceeds 45 m, the winding density increases, the sheet is crushed, and water absorbency decreases.

[0024] The roll length is measured as follows: First, measure the length of 10 sheets of kitchen towel sheet 1x between perforation 1c and the adjacent perforation 1c 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. If kitchen towel roll 1 does not have perforations, measure the roll length.

[0025] (Reel diameter (DR)) The lower limit of the winding diameter (DR shown in FIG. 1) of the kitchen towel roll 1 is preferably 127 mm or more, more preferably 135 mm or more, and even more preferably 140 mm or more. The upper limit of the winding diameter (DR) is preferably 175 mm or less, more preferably 165 mm or less, and even more preferably 157 mm or less. If the winding diameter (DR) is less than 127 mm, the winding density of the kitchen towel roll 1 will increase when the same winding length is attempted, causing the sheet to be crushed and resulting in poor water absorption. If the winding diameter (DR) is more than 175 mm, the winding density will decrease when the same winding length is attempted, and wrinkles will be more likely to occur during processing.

[0026] The roll diameter (DR) of the roll 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] (Roll width (W)) The lower limit of the roll width (W shown in FIG. 1) of the kitchen towel roll 1 is preferably 150 mm or more, more preferably 200 mm or more, and even more preferably 250 mm or more. The upper limit of the roll width (W) is preferably 380 mm or less, more preferably 340 mm or less, and even more preferably 300 mm or less. If the roll width (W) is less than 150 mm, the kitchen towel sheet 1x becomes small and has poor water retention. If the roll width (W) exceeds 380 mm, the kitchen towel sheet 1x is too large, and only a portion of the sheet absorbs water during use, resulting in poor water absorption per sheet area.

[0028] (roll mass) The lower limit of the roll mass of the kitchen towel roll 1 is preferably 200 g or more, more preferably 240 g or more, and even more preferably 260 g or more. The upper limit of the roll mass is preferably 550 g or less, more preferably 490 g or less, and even more preferably 450 g or less. If the roll mass is less than 200 g, the same winding diameter will result in a short winding length and a low winding density, which will result in wrinkles being more likely to occur during processing. If the roll mass exceeds 550 g, the same winding diameter will result in a long winding length and a high winding density, which will result in poor water absorbency.

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

[0030] (roll density) The roll density of kitchen towel roll 1 is 0.04 g / cm 3 More than 0.13g / cm 3 The roll density is 0.04 g / cm or less. 3 If the roll density is less than 0.13 g / cm, the film will be soft and wrinkles will easily occur during processing (winding). 3 If the density exceeds 100%, the thickness of the kitchen towel sheet 1x will be reduced, and the amount of water that can be absorbed will decrease, resulting in poor water absorption. The lower limit of the roll density is 0.05 g / cm 3 More than 0.06 g / cm is preferable. 3 The upper limit of the roll density is preferably 0.11 g / cm. 3 Preferably less than 0.09 g / cm 3 The following is more preferred:

[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 roll 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)] × roll width (converted per 280 mm). For example, if the roll mass (excluding the core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the core's outer diameter DI is 39 mm, then 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 lower limit of the winding density of kitchen towel roll 1 is 0.20 m / cm 2 More than 0.24m / cm is preferable.2 More preferably, 0.30 m / cm or more 2 The upper limit of the winding density is 0.56 m / cm. 2 Preferably less than 0.50m / cm 2 Less than 0.45m / cm is more preferable. 2 More preferably, the winding density is 0.20 m / cm 2 If the winding density is less than 0.56m / cm, the winding will be soft and wrinkles will easily occur during processing (winding). 2 If it exceeds this, the paper thickness of the kitchen towel sheet 1x will be low and the absorbency will be poor.

[0033] The winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the 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, winding diameter DR of 150 mm, and core outer diameter DI of 39 mm, the winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10)} 2 -3.14×(39mm÷2÷10) 2}=0.33m / cm 2 This becomes:

[0034] (Core outer diameter (DI)) The lower limit of the core outer diameter (DI shown in Figure 1), which is the outer diameter of the core 1d of the kitchen towel roll 1, is preferably 28 mm or more, more preferably 33 mm or more, and even more preferably 40 mm or more. The upper limit of the core outer diameter (DI) is preferably 58 mm or less, more preferably 53 mm or less, and even more preferably 46 mm or less. If the core outer diameter DI is less than 28 mm, the winding diameter DR will be small, and therefore, if a certain range of winding diameter DR is to be maintained, the winding density will be low, resulting in increased wrinkling during processing. If the core outer diameter DI exceeds 58 mm, the winding diameter DR will be large, and therefore, if a certain range of winding diameter DR is to be maintained, the winding density will be high, resulting in reduced paper thickness and poor water absorbency.

[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 1d does not have a paper tube, the outer diameter of the hollow core 1d is measured.

[0036] <Kitchen towel sheet> (Number of plies) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is formed by embossing at least the front ply and then laminating it into two plies. When laminating the two plies, it is preferable to use, for example, ply bond glue, and apply the glue to form an adhesive. By bonding the plies together in this way to form two plies, the plies are strongly bonded together, 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 glue and water may be mixed.

[0037] (Basic weight) The minimum basis weight per two plies of one kitchen towel sheet is 30 g / m 2 More than 36g / m 2 More preferably, 38 g / m 2 The upper limit of the basis weight per two plies is 54 g / m 2 Less than 48g / m 2 Less than 45 g / m is more preferable. 2 More preferably, the basis weight per two plies is 30 g / m 2 If the thickness is less than 54 g / m², the absorbency of the kitchen towel sheet will be poor. 2 If the temperature exceeds this, the ply bond glue will be absorbed too much when bonding the plies together, making the plies more likely to peel off.

[0038] The minimum basis weight per ply of a kitchen towel sheet is 15 g / m 2 More than 18g / m is preferable. 2 More preferably, 19 g / m 2The upper limit of the basis weight per ply is 27 g / m 2 Less than 24 g / m is preferred 2 Less than 22.5 g / m is more preferable. 2 More preferably, the basis weight per ply is 15 g / m 2 If the ply weight is less than 27 g / m, the absorbency of the kitchen towel sheet will be poor. 2 If the temperature exceeds this, the ply bond glue will be absorbed too much when bonding the plies together, making the plies more likely to peel off. The basis weight of the kitchen towel sheet 1x can be measured based on JIS P 8124.

[0039] (paper thickness) The paper thickness per two plies of the kitchen towel sheet 1x is preferably 0.35 mm or more and 0.80 mm or less. If the paper thickness per two plies is less than 0.35 mm, the kitchen towel sheet 1x will have poor water absorbency. If the paper thickness per two plies is more than 0.80 mm, the roll density of the kitchen towel roll 1 will be low and it will be prone to wrinkling during processing, assuming the same basis weight. The lower limit of the paper thickness is more preferably 0.40 mm or more, and even more preferably 0.45 mm or more. The upper limit of the paper thickness is more preferably 0.75 mm or less, and even more preferably 0.70 mm or less.

[0040] The paper thickness per two plies can be measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 37.85 gf / cm 2 The gauge diameter is 30 mm, and the sample is placed between the gauge and the measuring table. The gauge is read when the gauge is lowered at a speed of 1 mm per second or less. The sample is 10 plies of 1 kitchen towel sheet (5 sets of 2 plies = 10 plies), and the measurements are proportionally calculated to obtain the value per 2 plies. The measurement is also repeated 10 times at different points, and the average of the measurement results is used as the final paper thickness per 2 plies.

[0041] (seat length) The lower limit of the sheet length between adjacent perforations 1c of the kitchen towel sheet 1x (the length of the kitchen towel sheet 1x in the Y direction shown in Figure 1) is preferably 100 mm or more, more preferably 130 mm or more, and even more preferably 150 mm or more. The upper limit of the sheet length is preferably 250 mm or less, more preferably 230 mm or less, and even more preferably 210 mm or less. If the sheet length is less than 100 mm, the kitchen towel sheet 1x will have poor water retention. If the sheet length exceeds 250 mm, the kitchen towel sheet 1x will be too large, and only a portion of the sheet will absorb water during use, resulting in poor water absorption per sheet area.

[0042] (specific volume) The minimum volume limit for one kitchen towel sheet is 7cm 3 / g or more is preferable, and 9cm 3 / g or more is more preferable, and 12cm 3 / g or more is more preferable. The upper limit of the specific volume is 23 cm 3 / g or less is preferable, and 20cm 3 / g or less is more preferable, and 17cm 3 / g or less is more preferable. 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 1 / g, the roll density will be low and wrinkles will easily occur during processing. The specific volume is calculated by dividing the paper thickness per ply of 1x kitchen towel sheet by the basis weight per ply (paper thickness per product ply = basis weight per product ply), and then calculating the volume (cm) per unit (g). 3 )

[0043] (DMDT) The lower limit of the dry machine direction tensile strength (DMDT) of the kitchen towel sheet 1x (two-ply) in the dry state according to JIS P 8113 is preferably 600 cN / 25 mm or more, more preferably 700 cN / 25 mm or more, and even more preferably 800 cN / 25 mm or more. The upper limit of DMDT is preferably 1500 cN / 25 mm or less, more preferably 1400 cN / 25 mm or less, and even more preferably 1300 cN / 25 mm or less. If the DMDT is less than 600 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be low, resulting in poor water absorption. On the other hand, if the DMDT exceeds 1500 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be high, resulting in excessive absorption of the ply bond glue when bonding the plies together, making the plies more susceptible to peeling.

[0044] (DCDT) The lower limit of the dry cross-direction tensile strength (DCDT) of the kitchen towel sheet 1x (two plies) in the dry state according to JIS P 8113 is preferably 400 cN / 25 mm or more, more preferably 600 cN / 25 mm or more, and even more preferably 750 cN / 25 mm or more. The upper limit of DCDT is preferably 1400 cN / 25 mm or less, more preferably 1300 cN / 25 mm or less, and even more preferably 1150 cN / 25 mm or less. If the DCDT is less than 400 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be low, resulting in poor water absorption. On the other hand, if the DCDT exceeds 1400 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be high, resulting in excessive absorption of the ply bond glue when bonding the plies together, making the plies more susceptible to peeling.

[0045] The DMDT and DCDT of one kitchen towel sheet are measured in accordance with JIS P 8113.

[0046] (WMDT) The lower limit of the wet machine direction tensile strength (WMDT) of the kitchen towel sheet 1x (two-ply) according to the old JIS S 3104 is preferably 210 cN / 25 mm or more, more preferably 230 cN / 25 mm or more, and even more preferably 260 cN / 25 mm or more. The upper limit of WMDT is preferably 430 cN / 25 mm or less, more preferably 380 cN / 25 mm or less, and even more preferably 340 cN / 25 mm or less. If the WMDT is less than 210 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be low, resulting in poor water absorption. Furthermore, if the WMDT exceeds 430 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be high, resulting in excessive absorption of the ply bond glue when bonding the plies together, making the plies more susceptible to peeling.

[0047] (WCDT) The lower limit of the wet cross-direction tensile strength (WCDT) of the kitchen towel sheet 1x (two-ply) according to the old JIS S 3104 is preferably 160 cN / 25 mm or more, more preferably 190 cN / 25 mm or more, and even more preferably 220 cN / 25 mm or more. The upper limit of WCDT is preferably 370 cN / 25 mm or less, more preferably 330 cN / 25 mm or less, and even more preferably 300 cN / 25 mm or less. If the WCDT is less than 160 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be low, resulting in poor water absorption. Furthermore, if the WCDT exceeds 370 cN / 25 mm, the basis weight of the kitchen towel sheet 1x will be high, resulting in excessive absorption of the ply bond glue when bonding the plies together, making the plies more susceptible to peeling.

[0048] The WMDT and WCDT of one kitchen towel sheet are measured in accordance with the old JIS S 3104.

[0049] (MD elongation) The MD elongation of the kitchen towel sheet 1x (two-ply) when dry is preferably 10% or more and 22% or less. If the MD elongation is less than 10%, the sheet will not elongate even when a certain tension is applied when winding the kitchen towel sheet 1x, and wrinkles will not be smoothed out during processing and the sheet will be wound up with wrinkles. If the MD elongation is more than 22%, the sheet will be stretched too much when winding the kitchen towel sheet 1x, causing wrinkles during processing and the sheet will be wound up as they are. The lower limit of the MD elongation is more preferably 12% or more, and even more preferably 13% or more. The upper limit of the MD elongation is more preferably 20% or less, and even more preferably 18% or less.

[0050] The elongation percentage in the MD direction is the length that the kitchen towel sheet 1x stretched until it broke during the above DMDT measurement, expressed as a percentage of the length of the sheet before the measurement.

[0051] (Embossed) The kitchen towel sheet 1x of this embodiment is embossed and has an embossed pattern 10 in which two or more patterns are arranged at regular intervals. The presence of the embossed pattern 10 dramatically improves the design of the kitchen towel sheet 1x and the kitchen towel roll 1. The embossed pattern 10 is preferably provided on the ply on the surface 1a side of the kitchen towel sheet 1x.

[0052] 2 and 3 are diagrams showing an example of the embossing pattern 10 in the kitchen towel roll 1 of this embodiment. The embossing pattern 10 preferably includes radial embossments 11 and closed-ring structure embossments 12, with the radial embossments 11 and closed-ring structure embossments 12 alternately arranged at equal intervals. The inclusion of the radial embossments 11 dramatically improves the water diffusibility of the kitchen towel sheet 1x, while the inclusion of the closed-ring structure embossments 12 dramatically improves the water retention of the kitchen towel sheet 1x.

[0053] The lines forming the embossed pattern 10 may be solid, broken, dashed, or dotted, and may be of any thickness. Among these, solid lines are preferred because they provide good diffusion of absorbed moisture and good water retention.

[0054] (radial embossing) 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 outward or a plurality of linear embossments. When the embossing pattern 10 includes the radial embossments 11, water diffuses along the embossments, improving the water diffusibility of the kitchen towel sheet 1x.

[0055] (closed ring structure embossed) Like the radial embossments 11, the overall shape of the closed-ring structure embossments 12 is not particularly limited, but it is preferable that the closed-ring structure embossments include a linear or geometric embossment provided in the center and a geometric embossment that surrounds the central embossment to form a closed ring. When the embossed pattern 10 includes the closed-ring structure embossments 12, water is retained inside the embossments, improving the water retention of the kitchen towel sheet 1x.

[0056] (embossing size) The lower limit of the size (area) of the embossed pattern 10 including one radial embossment 11 and one closed-ring structure embossment 12 is 16 cm 2 More than 28cm is preferable. 2 More than 45cm is preferable. 2 More preferably, the upper limit is 250 cm 2 Less than 180cm is preferable 2 Less than 110cm is preferable. 2 More preferably, the size of the embossed pattern 10 is 16 cm 2 If the size of the embossed pattern 10 is less than 250 cm, the design of the embossed pattern 10 will be poor. 2 If the embossing pattern 10 exceeds this value, the embossing becomes uneven and wrinkles tend to occur during processing.

[0057] The size of the embossed pattern 10 is determined by calculating the area of ​​a rectangle E that includes (circumscribes) one embossed pattern 10 as shown in Fig. 3. The sizes of the long and short sides of this rectangle E can be changed as appropriate depending on the size of the embossed pattern 10 (radial embossments 11 and closed-ring structure embossments 12).

[0058] (Embossed pattern arrangement angle) The arrangement angle between adjacent identical patterns in the embossed pattern 10 (hereinafter also referred to as the "embossed pattern arrangement angle") is 20° or more and 80° or less with respect to the CD direction of the kitchen towel sheet 1x. If the embossed pattern 10 arrangement angle is less than 20° or more than 80°, the kitchen towel sheet 1x is likely to wrinkle during processing. The lower limit of the arrangement angle is preferably 25° or more, more preferably 30° or more. The upper limit of the arrangement angle is preferably 70° or less, more preferably 60° or less.

[0059] The relationship between the arrangement angle of the embossed pattern 10 and wrinkles during processing will now be explained. Generally, in the manufacturing process, the embossed pattern 10 is imparted to a raw web flowing in the MD direction (the Y direction in Figures 1 and 2) by applying an embossing roll with its axis perpendicular to the MD direction.

[0060] In this case, when the embossed patterns 10 are arranged parallel to the CD direction (X direction in Figures 1 and 3) of the raw sheet, the embossed patterns 10 are arranged at equal intervals in the MD direction (Y direction in Figures 1 and 3). Looking at this in the kitchen towel sheet 1x, embossed areas with high embossing density and unembossed areas with low embossing density alternate in the Y direction. Because the embossing creates unevenness, a large stretching force acts on the high embossing density areas, making it easy for wrinkles to form in the low embossing density areas. Therefore, in the kitchen towel sheet 1x, wrinkles are more likely to form in the low embossing density areas in the Y direction.

[0061] On the other hand, when the embossed patterns 10 are arranged at a fixed angle relative to the CD direction of the original roll, the embossed patterns 10 are arranged continuously in the MD direction rather than at equal intervals. Looking at this in the case of a kitchen towel sheet 1x, there are continuous embossed areas in the Y direction where the embossed areas have a high embossing density, and the areas with low embossing density are minimized, making it less likely to wrinkle.

[0062] The arrangement angle of the embossed pattern 10 is measured by the following method. (1) Select one embossment to be used as the measurement standard and determine the reference point of this embossment. For example, as shown in Figure 4, the kitchen towel sheet 1x is placed so that the MD direction (Y direction) is vertical and the CD direction (X direction) is horizontal. Then, any closed-ring structure embossment 12A (hereinafter referred to as "embossment 12A") in the center of the kitchen towel sheet 1x is selected, and its center point is set as reference point 12a. (2) Two embossments adjacent to the reference embossment on the left and right in the CD direction are identified, and measurement points for these embossments are determined. As shown in Figure 4, a straight line passing through reference point 12a and parallel to the CD direction is drawn, and this is designated as reference line 12x. The left closed-ring structure embossment and the right closed-ring structure embossment, which are located above reference line 12x and closest to reference point 12a in the CD direction, are designated as 12B and 12C, respectively, and their center points are designated as measurement points 12b and 12c. (3) Draw an auxiliary line passing through the reference point and the measurement point, and measure the angle between the reference line and the auxiliary line. As shown in Figure 4, an auxiliary line 12y passing through reference point 12a and measurement point 12b, and an auxiliary line 12z passing through reference point 12a and measurement point c are drawn. Then, the angle θ1 formed by reference line 12x and auxiliary line 12y, and the angle θ2 formed by reference line 12x and auxiliary line 12z are measured with a protractor and are defined as the arrangement angles. In Figure 4, θ1 is 35° and θ2 is 55°. Note that when θ exceeds 90°, the arrangement angle is defined as the angle obtained by subtracting θ from 180°. For example, when θ is 120°, the angle is defined as 60° (= 180° - 120°).

[0063] (proportion of linear embossed area) The proportion of linear embossed portions 100 in the embossed pattern 10 is preferably 20% or more. If the proportion is less than 20%, the design of the kitchen towel sheet 1x will be inferior. The proportion of linear embossed portions 100 in the embossed pattern 10 is more preferably 50% or more, and even more preferably 90% or more.

[0064] In this case, the linear embossed portion 100 refers to an embossment included in the embossed pattern 10 that has a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more.

[0065] The proportion of the linear embossed portion 100 is calculated as follows: First, an arbitrary 100 mm x 100 mm area on the surface of the kitchen towel sheet 1x on which the embossed pattern 10 is formed is divided into 10 mm squares. Then, the proportion of the linear embossed portion 100 is calculated using the following formula: Percentage of linear embossed portions 100 (%) = (number of squares containing linear embossed portions 100) ÷ (number of squares containing linear embossed portions 100 + number of squares containing embossments other than linear embossed portions 100) × 100

[0066] It should be noted that "a square containing an embossment other than the linear embossed portion 100" refers to a square among the radial embossment 11 or the closed ring structure embossment 12 that does not satisfy the conditions of the linear embossed portion 100. In addition, when one square contains both the linear embossment 100 and the dot embossment, the square is considered to be the square with the embossment that occupies the greater proportion.

[0067] (Embossed on the back of the kitchen towel sheet) There is no particular restriction on whether the back surface 1b of the kitchen towel sheet 1x has an embossed pattern 10, as long as it has a pattern of protrusions and recesses resulting from the papermaking process that is different from the embossed pattern 10 described below. Nested embossing or pin-to-pin embossing may be applied, or no embossing may be applied, but nested embossing or no embossing is preferred, and no embossing is more preferred.

[0068] (Water absorption amount) The water absorption capacity per unit area of ​​one kitchen towel sheet is 240g / m 2 More than 610g / m 2 The water absorption per unit area is preferably 240 g / m or less. 2 If the weight is less than 610 g / m, the kitchen towel sheet 1x will have poor absorbency. 2 Above this level, the water diffusion is poor. The lower limit of the water absorption per unit area of ​​one kitchen towel sheet is 290 g / m 2 More preferably, 380 g / m 2 The upper limit of the water absorption is 550 g / m 2 Less than 500g / m is more preferable. 2 The following is even more preferred:

[0069] The lower limit of the water absorption per unit mass of the kitchen towel sheet 1x is preferably 8.0 g / g or more, more preferably 8.5 g / g or more, and even more preferably 9.0 g / g or more. The upper limit is more preferably 14 g / g or less, and even more preferably 13 g / g or less. If the water absorption per unit mass is less than 8.0 g / g, the water absorbency of the kitchen towel sheet 1x will be poor.

[0070] The method for measuring the water absorption of each kitchen towel sheet 1x will be described below with reference to FIG. (1) First, a two-ply kitchen towel sheet 1x is taken and cut using a square template with each piece measuring 7.6 cm (3 inches) 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 22 (a jig that fixes three points of the test piece 20, and the jig is made of metal that does not absorb water). (2) 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 22 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 20 and the holder 22 are removed from the distilled water, and a strip 21 is attached to one corner 20d of the test piece 20 as shown in Figure 5. The strip 21 is made by peeling the same two-ply kitchen towel as the kitchen towel to be measured into one ply, cutting this paper kitchen towel into a piece measuring 2 mm x 15 mm, and attaching it to a portion of the test piece 20 6 mm from the corner 20d toward the center. Next, the holder 22 and test piece 20 are hung from a rod placed in an empty water tank with the corner 20a opposite the corner 20d facing up, and the lid of the water tank is closed and left for 15 minutes. (3) Then, the holder 22 and the test piece 20 are taken out of the water tank, the band 21 and the holder 22 are 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 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.

[0071] (Wet pulp content) The kitchen towel sheet 1x preferably contains wet pulp. The wet pulp content is preferably 50% or more. If the wet pulp content is less than 50%, the kitchen towel sheet 1x will have poor water retention. While there is no upper limit for the wet pulp content, if it is too high, the strength of the kitchen towel sheet 1x will tend to increase, resulting in poor texture. The wet pulp content is more preferably 65% ​​or more, and even more preferably 80% or more.

[0072] As the pulp, for example, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), etc. can be used, and the content ratio thereof is preferably NBKP:LBKP=40-100% by mass:0-60% by mass, more preferably NBKP:LBKP=50-90% by mass:10-50% by mass, and even more preferably NBKP:LBKP=60-80% by mass:20-40% by mass.

[0073] <Kitchen towel roll manufacturing method> The kitchen towel roll 1 can be produced, for example, in the following order: (1) papermaking and creping, (2) embossing and bonding, and (3) roll winding. Note that the TAD papermaking method is preferably used in the production (papermaking) process of the kitchen towel sheet 1x.

[0074] (Uneven pattern resulting from the papermaking process) In this case, it is preferable that in the papermaking process, the kitchen towel sheet 1x is provided with an uneven pattern derived from the papermaking process (fabric) that is different from the above-mentioned embossed pattern 10. By having this uneven pattern, the water absorption capacity of the kitchen towel sheet 1x can be further increased.

[0075] "Derived from the papermaking process" means that in the papermaking process for the kitchen towel sheet 1x, an uneven pattern is imparted between the headbox of the papermaking machine and the outlet of the Yankee dryer 32. Specifically, in part of the papermaking process shown in Figure 6, unevenness can be imparted in the (belt) press section 30, which is arranged between the dewatering roll 31 and the Yankee dryer 32. In the (belt) press section 30, the wet paper 34 and the uneven belt 33 (the uneven belt 33 loops between the (belt) press section 30 and the Yankee dryer 32) are pressed together, thereby imparting an uneven pattern to the wet paper 34. The uneven belt 33 may be an uneven fabric (wire).

[0076] The uneven pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the uneven pattern will change the specific volume (paper thickness), but it is preferable to select a pattern that will keep the specific volume in the rolled state within the above-mentioned numerical range.

[0077] As described above, according to this embodiment, it is possible to provide a kitchen towel roll that has excellent water absorbency and embossing with excellent design, yet is resistant to wrinkling during processing.

[0078] 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]

[0079] 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.

[0080] The kitchen towel rolls of Examples 1 to 5 and Comparative Examples 1 to 5 shown in Table 1 were manufactured through the following processes: (1) papermaking and creping, (2) embossing and laminating, and (3) roll winding. The kitchen towel roll packages of all Examples and Comparative Examples were then measured for the above-mentioned parameters and evaluated as follows. Note that parameters other than those evaluated below were measured according to the standards or measurement methods described above.

[0081] 1. Kitchen towel sheet absorbency The water absorbency of the manufactured kitchen towel sheets was evaluated by 30 monitors, and the number of people who felt that the sheet had poor water retention was rated on a 4-point scale. The evaluation criteria were as follows: ◎: 0-1 people felt that the sheet had poor water absorption. 〇: 2-4 people felt that the sheet was not very absorbent △: 5-7 people felt that the sheet was not very absorbent ×: Eight or more people felt that the sheet had poor water absorption.

[0082] 2. Design of kitchen towel sheets The design of the manufactured kitchen towel sheets was visually inspected by 30 monitors, who evaluated the design on a four-point scale based on the number of people who felt the sheet had poor design. The evaluation criteria were as follows: ◎: 0-1 people felt that the seat design was poor 〇: 2-4 people felt that the seat design was poor △: 5-7 people felt that the seat design was poor ×: Eight or more people felt that the seat design was poor.

[0083] 3. Wrinkle resistance during processing The resistance to wrinkling during processing was evaluated by visual inspection of the manufactured kitchen towel rolls. 30 monitors visually evaluated the presence or absence of wrinkles in 10 kitchen towel rolls (rolls) while pulling out the sheets, and rated them on a 4-point scale based on the number of people who felt that the sheets had a lot of wrinkles. The evaluation criteria are as follows: ◎: 0-1 people felt that the seat had many wrinkles 〇: 2-4 people felt that there were a lot of wrinkles in the seat △: 5-7 people felt that there were a lot of wrinkles in the seat ×: Eight or more people felt that the seat had many wrinkles

[0084] [Table 1]

[0085] [Table 2]

[0086] As is clear from the results shown in Tables 1 and 2, the kitchen towel rolls of Examples 1 to 5 were excellent in water absorbency, design, and resistance to wrinkling during processing. In contrast, the sheets of Comparative Examples 1 to 5 were all inferior in water absorbency, design, and resistance to wrinkling during processing.

[0087] Therefore, it was confirmed that the kitchen towel roll of the present invention can provide a kitchen towel roll that is excellent in water absorbency, has an embossing with excellent design, and is less likely to wrinkle during processing. [Explanation of symbols]

[0088] 1 kitchen towel roll 1a surface 1b back side 1c perforation 1d core (paper tube) 1e The outermost edge of a kitchen towel roll 1x kitchen towel sheet 10 Embossing Pattern 11 Radial Embossing 12 Closed ring structure embossing 12A Closed Ring Structure Embossed A 12B Closed Ring Structure Embossed B 12C Closed Ring Structure Embossed C 12a (closed ring structure embossed A) reference point 12b (closed ring structure embossed B) measurement point 12c (closed ring structure embossed C) measurement point 12x reference line 12y auxiliary line 12z auxiliary line 20 test specimens 20a,20d corner 21 Obi 22 Holder 30 (Belt) Press Section 31 Dewatering roll 32 Yankee Dryer 33 Concave belt 34 Wet Paper 100 Linear embossed part

Claims

1. A kitchen towel roll is a kitchen towel sheet formed by laminating two plies of sheets having an embossed pattern on at least the front ply, the kitchen towel sheet being wound into a roll, The embossed pattern has two or more types of patterns arranged at regular intervals, and the arrangement angle between adjacent identical patterns is 20° or more and 80° or less with respect to the CD direction of the kitchen towel sheet, Roll density is 0.04 g / cm ３ 0.13g / cm or more ３ A kitchen towel roll characterized by:

2. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a pattern of protrusions and recesses derived from a papermaking process, which is different from the embossed pattern.

3. 3. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has an MD elongation of 10% or more and 22% or less.

4. 3. The kitchen towel roll according to claim 1, wherein the thickness of each of the two plies of the kitchen towel sheet is 0.35 mm or more and 0.80 mm or less.

5. The water absorption capacity per unit area of ​​the kitchen towel sheet is 240 g / m ２ 610g / m or more ２ 3. The kitchen towel roll according to claim 1, wherein:

6. 3. The kitchen towel roll according to claim 1, wherein the embossing pattern includes radial embossings and closed-ring structure embossings, and the radial embossings and the closed-ring structure embossings are alternately arranged at equal intervals.

7. 3. The kitchen towel roll according to claim 1, wherein the embossed pattern has linear embossed portions that account for 20% or more of the total area.

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