kitchen towel roll

Abstract

To provide a kitchen towel roll which is excellent in water absorption, does not cause ply peeling, and is low in exchange frequency even under the condition that a basis weight is not excessively high but within a prescribed range.SOLUTION: A kitchen towel roll 1 performs adhesion processing of a sheet to which embossment patterns are imparted with glue and winds up a kitchen towel sheet 1x laminated in 2 ply into a roll shape. In the kitchen towel roll 1, the kitchen towel sheet has a rugged pattern originated in a papermaking step different from the embossment patterns, has a basis weight in 2 ply between 30 g / m2 and 54 g / m2, a paper thickness between 1.3 mm / 10 and 5 mm / 10, an amount of water absorption per 1 m2 in 2 ply between 220 g and 600 g, a wound length of the kitchen towel roll 1 between 14 m and 44 m, and a winding diameter between 110 mm and 189 mm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, various types of kitchen towels have been developed. Water and oil absorption capacity is important for kitchen towels, and papermaking techniques have been developed to increase water and oil absorption capacity. In addition, technology has been developed to reduce paper thickness by using embossed patterns.

[0003] For example, Patent Document 1 describes a paper sheet that contains pulp as the main component, is made of one or more sheets stacked together, and has a basis weight of 15 to 50 g / m 2 The disclosure also includes a kitchen towel that has an oil absorption / basis weight of 4.5 to 7.5 OIL-g / g, and when the length of the measurement field of view, which avoids the embossing performed mechanically in a process other than the paper machine, is 1.0 to 1.4 mm, the height difference of the surface irregularities is 100 to 600 μm, and the area ratio of the surface depressions measured under conditions of a scan area of ​​10 cm × 10 cm is 2 to 12%, and which is obtained by applying dry crepe, and a method for producing the same. Patent Document 2 also discloses an indentation and projection layer of an indentation and projection belt for indenting a wet fibrous web by pressing it in the press section of a tissue papermaking machine for producing high-bulk tissue paper, the indentation and projection layer being nonwoven and having a web-carrying side with a surface that cooperates with the fibrous web, the surface having depressions or elevated portions that form a three-dimensional structure on the surface; a press section and papermaking machine for producing high-bulk crepe tissue paper web; and a method for producing the same. Furthermore, Patent Document 3 discloses a method for producing a rolled paper product, which includes the steps of preparing at least one paper web and embossing the at least one web with an embossing pattern that covers at least about 22% of the total surface area of ​​the at least one web, wherein the pattern includes at least about 80% linear embossings, and the caliper of the finished product is smaller than the caliper of the embossed base sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5373208 [Patent Document 2] Special Publication No. 2011-506780 [Patent Document 3] Special Publication No. 2016-540530 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the amount of water absorption varies depending on the embossing pattern, and it has been difficult to improve the amount of water absorption using the above papermaking techniques alone. In particular, when using thick base paper obtained using the above papermaking techniques, it has been found that if embossing is applied in the same way as with normal base paper, the paper in the embossed areas will be crushed, resulting in a decrease in the amount of water absorption. In other words, with normal base paper, it is common sense to emboss to increase the bulkiness in order to increase the amount of water absorption, but with papermaking techniques that increase the bulkiness of base paper, it has been found that it is difficult to improve the amount of water absorption using the general concept of embossing.

[0006] Therefore, if the embossed portions are reduced, the ply peels off when water is absorbed, causing the paper to tear and poor wiping properties. In other words, unlike ordinary towel base paper, when base paper made using the above papermaking technology is used, the amount of water absorbed increases, making the ply peel off and the paper more likely to tear. Furthermore, the water absorption capacity may be reduced when a pattern that reduces the paper thickness by embossing is used, as in Patent Document 3. Of course, increasing the basis weight improves the water absorption capacity, but increases the cost.

[0007] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a kitchen towel roll that has good water absorption, is not bulky, does not suffer from ply peeling, and requires less frequent replacement, even when the basis weight is not excessively high and is kept within a certain range. [Means for solving the problem]

[0008] The inventors of the present invention conducted extensive research to solve the above-mentioned problems. As a result, they discovered that the above-mentioned problems could be solved by applying a different concavo-convex pattern to the kitchen towel sheet and adjusting the basis weight, paper thickness, and water absorption capacity of the kitchen towel sheet, as well as the roll length and diameter of the kitchen towel roll, and thus completed the present invention. Specifically, the present invention provides the following:

[0009] (1) A first aspect of the present invention is a kitchen towel roll obtained by laminating two plies of sheets each having an embossed pattern with glue, and winding the resulting kitchen towel sheet into a roll. The kitchen towel sheet has a pattern of protrusions and recesses derived from a 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 has a water absorption capacity of 220 g or more and 600 g or less per roll, a roll length of 14 m or more and 44 m or less, and a roll diameter of 110 mm or more and 189 mm or less.

[0010] (2) A second aspect of the present invention is the kitchen towel roll according to (1), characterized in that the water absorption per gram of the two plies of the kitchen towel sheet is 6 g or more.

[0011] (3) The third aspect of the present invention is a kitchen towel roll according to (1) or (2), wherein the kitchen towel sheet has a thickness of 1 m between two plies of the kitchen towel sheet. 2 It is characterized by having a water absorption capacity of 100g or more and 300g or less per unit.

[0012] (4) A fourth aspect of the present invention is a kitchen towel roll according to any one of (1) to (3), characterized in that the embossing depth in the embossing pattern is 0.06 mm or more and 1.1 mm or less.

[0013] (5) A fifth aspect of the present invention is a kitchen towel roll according to any one of (1) to (4), characterized in that the ratio of the embossing depth in the embossing pattern to the paper thickness of the entire kitchen towel sheet is 0.02 or more and 0.4 or less.

[0014] (6) A sixth aspect of the present invention is the kitchen towel roll according to any one of (1) to (5), wherein the roll density of the kitchen towel roll is 0.04 g / cm 3 More than 0.15g / cm 3 It is characterized by the following:

[0015] (7) A seventh aspect of the present invention is a kitchen towel roll according to any one of (1) to (6), wherein the winding density of the kitchen towel roll is 0.22 m / cm 2 More than 0.68m / cm 2 It is characterized by the following:

[0016] (8) The eighth aspect of the present invention is a kitchen towel roll according to any one of (1) to (7), characterized in that the area ratio of the convex portions on the embossing roll for applying the embossing pattern is 4% or more and 40% or less.

[0017] (9) A ninth aspect of the present invention is the kitchen towel roll according to any one of (1) to (8), characterized in that the embossed pattern is linear.

[0018] (10) A tenth aspect of the present invention is the kitchen towel roll according to (9), wherein the total length of the embossments added together in the linear embossing pattern, which have a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more, is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 It is characterized by the following:

[0019] (11) The eleventh aspect of the present invention is a kitchen towel roll according to any one of (1) to (10), characterized in that the root mean square height of the surface roughness of the kitchen towel sheet in the portion not provided with the embossed pattern is 35 μm or more.

[0020] (12) The twelfth aspect of the present invention is a kitchen towel roll according to any one of (1) to (11), characterized in that the kitchen towel sheet does not have an embossed back surface. [Effects of the Invention]

[0021] Therefore, according to the present invention, even under conditions where the basis weight is not excessively high but is within a certain range, it is possible to provide a kitchen towel roll that has good water absorption, is not bulky, does not suffer from ply peeling, and requires less frequent replacement. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view showing the appearance of a kitchen towel roll 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 a height profile on the XY plane as observed by a microscope using shading. [Figure 4] FIG. 1 is a graph showing a height profile on the XY plane obtained by a microscope. [Figure 5]FIG. 10 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 6] FIG. 10 is a diagram showing the height profile of a non-embossed portion on the XY plane as viewed under a microscope, using gray scales. [Figure 7] FIG. 1 is a diagram showing a method for measuring the water absorption of a kitchen towel roll of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described in detail. However, the following embodiments are presented for illustrative purposes, and the present invention is not limited to the following embodiments in any way.

[0024] <Kitchen towel roll> Figure 1 is a perspective view showing the appearance of a kitchen towel roll 1 of the present invention. The kitchen towel roll 1 of the present invention is a kitchen towel sheet 1x made by gluing sheets with embossed patterns and laminating them into two plies, which is then wound into a roll. Preferably, the kitchen towel sheet 1x has perforations in the width direction at equal intervals in the machine direction.

[0025] As shown in FIG. 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).

[0026] (winding length and winding diameter) The roll length of the kitchen towel roll 1 is 14 m or more and 44 m or less. The roll diameter DR of the kitchen towel roll 1 is 110 mm or more and 189 mm or less. If the roll length is less than 14 m, the roll needs to be replaced more frequently, and if the roll length exceeds 44 m, the roll becomes bulky. If the roll diameter DR is less than 110 mm, the water absorption capacity is poor or the roll length is short, requiring more frequent replacement. If the roll diameter DR exceeds 189 mm, the roll becomes bulky or the roll density is low, making it difficult to improve the water absorption capacity despite the bulk.

[0027] The winding length is preferably 21 m or more and 37 m or less, and more preferably 25 m or more and 33 m or less. The winding diameter DR is preferably 130 mm or more and 176 mm or less, and more preferably 140 mm or more and 163 mm or less. The roll length is determined by measuring the length of 10 sheets of kitchen towel sheets 1x between the perforations of kitchen towel roll 1. Then, the number of sheets in kitchen towel roll 1 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80 m and 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, the roll length can be measured by measuring it. The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Corporation. Ten kitchen towel rolls 1 are measured, and the results are averaged. The length between perforations (the length of the sheet in the machine direction) is preferably 100 mm to 270 mm, more preferably 125 mm to 240 mm, and even more preferably 150 mm to 210 mm. By keeping the length within this range, when using a kitchen towel roll 1 with good water absorption as in the present application, the area used will be appropriate and the amount of water absorption will be good.

[0028] (roll width and roll mass) The roll width of the kitchen towel roll 1 is preferably 150 mm to 380 mm, more preferably 200 mm to 340 mm, and even more preferably 250 mm to 300 mm. By setting the roll width within this range, when using the kitchen towel roll 1 with good water absorption as in the present application, the area used will be appropriate and the amount of water absorption will be good. The roll mass of the kitchen towel roll 1 is preferably 160 g to 550 g, more preferably 230 g to 450 g, and even more preferably 270 g to 380 g. By keeping the roll mass within this range, when using the kitchen towel roll 1 with good water absorption as in the present application, it can be replaced more frequently without being bulky. The roll mass is the mass per 280mm roll width, excluding the core (paper tube). If the roll width is not 280mm, it is converted to the mass per 280mm by proportional calculation.

[0029] (Roll density and winding density) The roll density of kitchen towel roll 1 is 0.04 g / cm 3 More than 0.15g / cm 3 Preferably, the winding density is 0.22 m / cm or less. 2 More than 0.68m / cm 2 The roll density of the kitchen towel roll 1 is preferably 0.04 g / cm or less. 3 or the winding density is less than 0.22m / cm 2 If the roll density of the kitchen towel roll 1 is less than 0.15 g / cm, the water absorption capacity is not improved despite the bulkiness of the kitchen towel roll 1. 3 or the winding density is 0.68m / cm 2 If it exceeds this value, the paper thickness and specific volume will be low, and the water absorption capacity will be poor. The roll density of kitchen towel roll 1 is 0.05 g / cm 3 More than 0.13g / cm 3 Preferably, it is 0.06 g / cm or less. 3 More than 0.09g / cm 3 The winding density of the kitchen towel roll 1 is preferably 0.25 m / cm or less. 2 More than 0.54m / cm 2 More preferably, it is 0.28 m / cm or less. 2 More than 0.40m / cm 2 It is more preferable that:

[0030] 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 outer diameter part of the roll (winding diameter DR) - (cross-sectional area of ​​the outer diameter part of the core (cardboard tube))}. The core outer diameter DI is the diameter of the center hole of the roll. 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, winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}=0.33m / cm 2 If kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI. The roll density is expressed as (roll mass) ÷ (roll volume). The roll mass is the mass of the kitchen towel roll 1 per 280 mm of roll width. The roll volume is expressed as [{cross-sectional area of ​​the roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​the core outer diameter)] × 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 is 150 mm, and the core outer diameter is 39 mm, the roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(280mm÷10)]=0.083g / cm 3 If the kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI.

[0031] (Basic weight) The basis weight of one kitchen towel sheet (2 plies) is 30 g / m 2 More than 54g / m 2 The basis weight of the two plies is 30 g / m 2 If the weight is less than 54 g / m, the water absorption capacity of one kitchen towel sheet will be inferior. 2 If the weight exceeds 100g / m², the production cost of the kitchen towel roll 1 will be high. The basis weight of the two plies of the kitchen towel sheet 1x is 34g / m². 2 More than 50g / m 2 Preferably, it is 38 g / m or less. 2 More than 46g / m 2It is more preferable that the basis weight is as follows: The basis weight is measured in accordance with JIS P 8124.

[0032] In addition, the basis weight per ply of the kitchen towel sheet 1x is 14 g / m on both the front surface 1a and the back surface 1b. 2 More than 28g / m 2 Preferably, it is 16 g / m or less. 2 More than 26g / m 2 More preferably, it is 18 g / m or less. 2 More than 24g / m 2 The basis weight per ply is determined by measuring the basis weight of two plies, peeling the plies, measuring the mass of the front surface 1a and the back surface 1b, and calculating the basis weight of the front surface 1a and the back surface 1b from the mass ratio. Furthermore, in the kitchen towel sheet 1x, the basis weight of the back surface 1b is 0.1 g / m 2 More than 1g / m 2 The surface 1a has an embossed pattern, which will be described later, and therefore tends to have a lower water absorption capacity than the back surface 1b. By increasing the basis weight of the back surface 1b, the water absorption capacity of the back surface 1b can be increased, and thus the overall water absorption capacity can be increased. The basis weight of the back surface 1b is preferably 0.1 g / m or more higher than the basis weight of the surface 1a. 2 More than 0.8g / m 2 Higher values ​​are more preferable, and 0.2 g / m 2 More than 0.5g / m 2 The higher the value, the more preferable it is.

[0033] (paper thickness) The paper thickness of the kitchen towel sheet 1x is 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less. If the paper thickness is less than 1.3 mm / 10 sheets, the water absorption capacity of the kitchen towel sheet 1x is poor, and if it exceeds 5 mm / 10 sheets, the water absorption capacity is not improved despite the bulk. The paper thickness of the kitchen towel sheet 1x is preferably 2.0 mm / 10 sheets or more and 4.4 mm / 10 sheets or less, and more preferably 2.6 mm / 10 sheets or more and 3.8 mm / 10 sheets or less. The paper thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa, a probe diameter of 30 mm, a 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. Five sets of two-ply kitchen towel sheets 1x are stacked together to measure 10 sheets. The measurement is also repeated 10 times at different locations and the measurement results are averaged.

[0034] (embossed pattern) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an embossed pattern. Furthermore, the kitchen towel sheet 1x of the present invention is made by laminating two plies after embossing the sheet. When laminating the two plies, a ply bond glue is applied and bonded. By bonding the plies together in this way to form a two-ply structure, the plies are strongly bonded together, and the kitchen towel sheet 1x is less likely to tear or peel off even when wet.

[0035] An embossed pattern is applied to the ply on the surface 1a of the kitchen towel sheet 1x. By applying an embossed pattern to the surface 1a, glue can be applied to the embossed portions of the embossed pattern for adhesion, which reduces the likelihood of ply peeling of the kitchen towel sheet 1x and maintains a consistent water absorption capacity. The embossed pattern is not particularly limited as long as it is a pattern commonly used on kitchen towels, such as a dotted or linear pattern. A linear embossed pattern is preferred. Specifically, as shown in FIG. 2, the linear embossed pattern may include two patterns, each containing two of two types of shapes: a roughly circular shape with another pattern inside, and a shape that is roughly symmetrical vertically and horizontally and includes a combination of multiple curves and shapes. For the roughly circular shape, it is preferable that the roughly circular shape be double. Furthermore, the dimensions of the embossed pattern are such that the rectangle E (E is not the embossed pattern) surrounding the embossed pattern is preferably a square with sides of 2 cm to 25 cm, more preferably a square with sides of 5 cm to 20 cm, and even more preferably a square with sides of 8 cm to 15 cm. The lengthwise direction of this rectangle E is preferably parallel to the flow direction of the kitchen towel roll 1, and the widthwise direction is preferably parallel to the width direction of the kitchen towel roll 1, although they may be tilted. By using such a pattern, the highly absorbent kitchen towel sheet 1x of the present application can achieve good water absorption, and the plies are less likely to peel, resulting in good wiping properties.

[0036] In this case, for linear embossing patterns with a thickness of 0.1 mm to 4 mm and a length of 5 mm or more, the total length of the embossing added together is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 Preferably less than 80cm / 100cm 2 More than 410cm / 100cm 2 It is more preferable that it is 110cm / 100cm or less. 2 More than 300cm / 100cm 2It is more preferable that: The total length is calculated by measuring the total length of all embossments that are 0.1 mm to 4 mm thick and 5 mm or longer inside a rectangle E that includes all of the embossed patterns as shown in Figure 2, and the total length is 100 cm. 2 The total length per square E is the total length per square. The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. If a rectangle containing all embossed patterns contains an embossed pattern adjacent to an embossed pattern contained within the rectangle, the length of that adjacent embossed pattern is also measured and included in the total length. If the size of one side of rectangle E cannot be clearly determined based on the embossed pattern, the size of rectangle E is set to 10 x 10 cm, and the total length of the embossed length contained within this rectangle E is measured. By keeping the total length within the above range, the highly absorbent kitchen towel sheet 1x of the present application can have good water absorption, and the plies are less likely to peel off, resulting in good wiping properties. The total length is determined by actual measurement using the method described above. Measurement may also be performed using a general microscope.

[0037] In the embossing pattern, the embossing depth is preferably 0.06 mm or more and 1.1 mm or less. If the embossing depth is less than 0.06 mm, the plies tend to peel off in the kitchen towel sheet 1x of the present invention, which has high water absorption. If the depth exceeds 1.1 mm, the specific volume of the kitchen towel sheet 1x increases, making it difficult to improve water absorption despite its bulkiness. The depth of the embossing in the embossing pattern is more preferably 0.10 mm or more and 0.80 mm or less, and even more preferably 0.20 mm or more and 0.55 mm or less.

[0038] The depth of the embossment is measured using a microscope. The microscope used can be a Keyence One-Shot 3D Measuring Macroscope VR-3100. The microscope image observation, measurement, and image analysis software can be the VR-H1A. The measurement conditions are a magnification of 25x and a field of view of 12mm x 9mm. The measurement magnification and field of view can be changed as appropriate depending on the desired size of the embossment.

[0039] Figure 3 shows a height profile on the XY plane taken with a microscope, with the height of the surface of the kitchen towel sheet 1x represented by shading. The linear areas in Figure 3 that are shaded differently from the surrounding area represent individual embossments. The depth of the embossment is determined by measuring the height difference of the embossment using the microscope. The measurement is performed on the surface 1a side of the kitchen towel sheet 1x. Furthermore, when measuring, three laps of the kitchen towel sheet 1x are removed from the kitchen towel roll 1, and the fourth lap of the kitchen towel sheet 1x is used to measure the two-ply sheet. Furthermore, if there are perforations, these are avoided when measuring. First, a line segment AB is drawn as shown in Figure 3 to obtain the height profile shown in Figure 4. Line segment AB should be drawn across the embossments. Line segment AB is drawn in the width direction (CD) of the kitchen towel sheet 1x. However, if the spacing between embossments is narrow, e.g., 2 mm or less, resulting in a low height of the convex portions described below, the line segment may be drawn diagonally or in the machine direction. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual kitchen towel sheet 1x sample surface. However, it also contains noise (steep peaks due to fiber clumps, whisker-like fibers, or fiber-free areas on the surface of the kitchen towel sheet 1x). Therefore, when calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0040] Therefore, the (measured) cross-sectional curve S in Figure 4 was smoothed using the weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 5. Note that smoothing using the weighted average radio button filter can be achieved automatically using the analysis software described above. Then, in the graph shown in Figure 5, the average of the maximum values ​​on the vertical axis of the convex portion H1 and the convex portion H2 adjacent to the convex portion H1 was calculated, and the minimum value on the vertical axis of the concave portion D1 sandwiched between the convex portions H1 and H2 was determined. The value obtained by subtracting the minimum value from the average of the maximum values ​​thus obtained was used as the provisional emboss depth. Then, as shown in Figure 5, similar measurements were performed at two consecutive locations on the cross-sectional curve (the concave portion D1 and the concave portion D2 sandwiched between the convex portions H3 and H4) (two consecutive measurement results were obtained at this point). Next, rotate the kitchen towel roll 1 by 90 degrees three times in the direction of the flow of the kitchen towel sheet 1x, and take the same measurements as above at each position (for a total of four measurement positions in the direction of the flow), and ultimately use the average value of the total eight positions (2 x 4) as the embossing depth. Since the kitchen towel sheet 1x of the present invention has a convex-concave pattern derived from the papermaking process, which is different from the embossed pattern, there is variation in the height of the convex portions on either side of the concave portion. Therefore, if the difference in the vertical axis between the convex portions sandwiching the concave portion (for example, convex portions H3 and H4 sandwiching concave portion D2) is 0.2 mm or more, measurements are performed at a location that avoids that portion.

[0041] Furthermore, the ratio of the embossing depth in the embossing pattern to the overall paper thickness of the kitchen towel sheet 1x, i.e., the ratio of the embossing depth in the embossing pattern to the overall paper thickness of the kitchen towel sheet 1x, is preferably 0.02 or more and 0.4 or less. If the ratio is less than 0.02, the thickness of the 1m between the two plies of the kitchen towel sheet 1x will be 2The water absorption per ply is low, resulting in poor overall water absorption and making the plies more susceptible to peeling. If the ratio exceeds 0.4, the water absorption is not improved as much as the ply becomes bulky. The ratio of the embossing depth in the embossing pattern to the overall paper thickness of the kitchen towel sheet 1x is more preferably 0.04 to 0.35, and even more preferably 0.08 to 0.20.

[0042] There is no particular restriction on whether the back surface 1b of the kitchen towel sheet 1x has an embossed pattern, as long as it has a different pattern of protrusions and recesses from the papermaking process. It may be nested embossed or pin-to-pin embossed, or it may not be embossed; however, nested embossing or no embossing is preferred, and no embossing is more preferred. Conventional kitchen towels ensure water absorption using pin-to-pin or nested patterns, but when using thick base paper as in the present application, as mentioned above, providing embossing causes the paper to collapse, reducing water absorption. For this reason, it is preferable that the front surface 1a be linearly embossed and the back surface 1b be unembossed.

[0043] In this case, the root mean square height Sq of the surface roughness of the kitchen towel sheet 1x in the portion not provided with the embossed pattern (hereinafter also referred to as the non-embossed portion) is preferably 35 μm or more, more preferably 50 μm to 150 μm, even more preferably 60 μm to 120 μm, and particularly preferably 70 μm to 90 μm. If the root mean square height Sq of the surface roughness is less than 35 μm, the absorbency is poor. Furthermore, although there is no particular upper limit for the root mean square height Sq of the surface roughness, if the value is too high, the sheet may become bulky. The root mean square height Sq of the surface roughness of the non-embossed portion is measured using a microscope. As with the embossing depth described above, the microscope used can be the KEYENCE One-Shot 3D Measuring Macroscope VR-3100. The microscope software used for observing, measuring, and analyzing microscope images can be the VR-H1A. Measurements are performed at a magnification of 38x and with a field of view of 8mm x 6mm. The measurement magnification and field of view can be adjusted depending on the desired embossing size.

[0044] For the image obtained in Figure 6, filters are set in the same way as for the embossing depth described above. Specifically, by setting an S-filter (low-pass filter), components with a scale smaller than the cutoff wavelength are removed from the image, and by setting an L-filter (high-pass filter), components with a scale larger than the cutoff wavelength are removed. Here, the S-filter is set to 500 μm and the L-filter to 8 mm. By selecting the S-filter and L-filter, the root-mean-square height Sq is automatically calculated. As with the embossing depth, the non-embossed portion is measured by removing three laps of kitchen towel sheet 1x from kitchen towel roll 1 and using the fourth lap of kitchen towel sheet 1x to measure the two-ply sheet. Also, if there are perforations, these are avoided when measuring. Measurements are taken at two locations across the width of the kitchen towel roll, and then the kitchen towel roll 1 is rotated three times by 90 degrees in the machine direction of kitchen towel sheet 1x, and the same measurements are taken at each location (for a total of four measurement locations in the machine direction). The average of these eight locations (2 x 4) is ultimately used as the root mean square height Sq.

[0045] (Water absorption) In the present invention, 1 m of 2 plies of kitchen towel sheet 1x 2 The water absorption capacity per 1m is between 220g and 600g. 2If the water absorption per unit is less than 220g, the water absorption will be inferior to that of the kitchen towel sheet 1x, and if it exceeds 600g, the thickness of the kitchen towel sheet 1x will be too thick and bulky. 2 The water absorption per unit weight is preferably 270 g or more and 550 g or less, more preferably 330 g or more and 480 g or less, and even more preferably 370 g or more and 480 g or less. Furthermore, the water absorption per gram of the two plies of the kitchen towel sheet 1x is preferably 6 g or more. If the water absorption per gram is less than 6 g, the water absorption will be inferior to that of the kitchen towel sheet 1x. The water absorption per gram is more preferably 7.0 g or more and 14.0 g or less, and even more preferably 8.0 g or more and 12.0 g or less.

[0046] In addition, 1x kitchen towel sheet, 1m between 2 plies 2 It is preferable that the water absorption per 1m between two plies is 100g or more and 300g or less. 2 If the water absorption per meter is less than 100g, the water absorption of the kitchen towel sheet 1x will be inferior, and if it exceeds 300g, the paper thickness of the kitchen towel sheet 1x will be high and bulky, and the water absorption will not improve despite the bulkiness. 2 The water absorption per meter is 2 plies. 2 From the amount of water absorption per 1m of 1 ply (surface 1a) described later, 2 Water absorption per 1m of 1 ply (back 1b) 2 This is the value obtained by subtracting the amount of water absorbed per unit area. In addition, 1m between 2 plies 2 The water absorption per unit area is more preferably 130 g or more and 280 g or less, and even more preferably 160 g or more and 260 g or less. The water absorption per unit area of ​​the kitchen towel sheet 1x is measured as follows.

[0047] First, take one sheet of kitchen towels stacked in two plies and cut it using a square template with each piece measuring 7.6 cm (3 inches) to create a rectangular test piece with each side measuring 7.6 cm. The mass of the test piece before water absorption is measured using an electronic balance. The test piece is then placed in a holder (a jig that fixes three points of the test piece, made of metal that does not absorb water). Next, a commercially available tray was filled with distilled water to a depth of 2 cm, and the test specimen placed in the holder was immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test specimen and holder were removed from the distilled water, and a band 210 was attached to one corner 200d of the test specimen 200 as shown in Figure 7. The band 210 was made by cutting a 1x kitchen towel sheet identical to the sample to be measured into a size of 2 mm wide x 15 mm long, peeling off the ply, and using the backside ply, attaching it to a section of the test specimen 200 6 mm from corner 200d toward the center. Next, the holder and test specimen 200 were hung from a rod placed in an empty water tank with corner 200a facing up, the tank lid was closed, and the test specimen 200 was left for 10 minutes. The holder 220 and test specimen 200 were then removed from the water tank, the band 210 and holder 220 were removed, and the mass of the test specimen 200 was measured using an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, the 1 m 2 Absorption of distilled water per sheet (g water / sheet m 2 ) is calculated. 2 Water absorption per sheet (g water / m 2 ) by the basis weight of the two plies of the test piece 200, 2 Water absorption per sheet (g water / m 2 ) / basis weight (sheet g / sheet m 2 ) = Water absorption per 1g (g of water / g of sheet). Measurements are carried out five times for each sample, and the average value is used. The water absorption of one ply is measured by cutting a kitchen towel sheet 1x that is layered on two plies using a square template with each side being 7.6 cm (3 inches) to obtain a rectangular test piece 200 with each side being 7.6 cm, and then peeling the plies off to obtain the test piece 200 for measuring the water absorption of one ply. The measurement method is the same as for two plies. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0048] In the present invention, 1 m of 1 ply (surface 1a) of the kitchen towel sheet 1x 2 The water absorption per m of one ply (back surface 1b) of the kitchen towel sheet 1x is preferably 50 g or more and 160 g or less, more preferably 60 g or more and 145 g or less, and even more preferably 70 g or more and 130 g or less. 2 The amount of water absorption per unit weight is preferably 50 g or more and 165 g or less, more preferably 60 g or more and 150 g or less, and even more preferably 70 g or more and 135 g or less. The water absorption per gram of one ply (front surface 1a) of the kitchen towel sheet 1x is preferably 3.0g or more, more preferably 3.5g to 7.0g, and even more preferably 4.0g to 6.0g. In contrast, the water absorption per gram of one ply (back surface 1b) of the kitchen towel sheet 1x is preferably 3.1g or more, more preferably 3.6g to 7.1g, and even more preferably 4.1g to 6.1g.

[0049] (Core outer diameter) The core outer diameter DI of the kitchen towel roll 1 of the present invention is preferably 25 mm to 55 mm, more preferably 30 mm to 50 mm, and even more preferably 35 mm to 45 mm. By having the core outer diameter DI within the above range, the winding density of the kitchen towel roll 1 can be maintained at a suitable level while the kitchen towel roll 1 is not bulky, making it easier to fit into a kitchen towel holder and also making the kitchen towel roll 1 easier to handle during production. The core outer diameter was measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Ten kitchen towel rolls 1 were measured, and the measurement results were averaged. Furthermore, the mass of the core (paper tube) per 280 mm roll width is preferably 5 g or more and 22 g or less, more preferably 7 g or more and 17 g or less, and even more preferably 9 g or more and 13 g or less.

[0050] (specific volume) The specific volume of one kitchen towel sheet is 7cm 3 / g or more 22cm 3 / g or less. The specific volume of 1x kitchen towel sheet is 7 cm 3 If the absorbency is less than 1 / g, the absorbency will be inferior to that of a single kitchen towel sheet. 3 If the specific volume exceeds 9 cm / g, the water absorption capacity is not improved despite the bulkiness. 3 / g or more 20cm 3 / g or less is more preferable, and 12cm 3 / g or more 17cm 3 The specific volume is calculated by dividing the paper thickness per two plies of one kitchen towel sheet by the basis weight per two plies, and expressing the volume cm per unit g. 3 It is expressed as:

[0051] (DMDT and DCDT) The two plies of the kitchen towel sheet 1x preferably have a dry machine direction tensile strength (DMDT) of 4.5 N / 25 mm or more and 21 N / 25 mm or less, and a dry cross direction tensile strength (DCDT) of 4.5 N / 25 mm or more and 21 N / 25 mm or less, based on JIS P 8113. If the DMDT or DCDT is less than 4.5 N / 25 mm, the kitchen towel sheet 1x, which has a high water absorption capacity as in the present application, will be prone to tearing upon absorbing water, while if the DMDT or DCDT exceeds 21 N / 25 mm, the density of the kitchen towel sheet 1x will be high and its water absorbency will be poor. The DMDT is more preferably 6.0 N / 25 mm or more and 17.0 N / 25 mm or less, and even more preferably 7.5 N / 25 mm or more and 12.0 N / 25 mm or less, and the DCDT is more preferably 6.0 N / 25 mm or more and 17.0 N / 25 mm or less, and even more preferably 7.5 N / 25 mm or more and 12.0 N / 25 mm or less. The ratio of DMDT to DCDT (DMDT / DCDT) is preferably 0.9 or more and 1.6 or less, more preferably 1.0 or more and 1.4 or less, and even more preferably 1.0 or more and 1.2 or less.

[0052] (WMDT and WCDT) Furthermore, the two plies of the kitchen towel sheet 1x preferably have a wet machine direction tensile strength (WMDT) of 1.5 N / 25 mm or more and 8.0 N / 25 mm or less, both based on the old JIS S 3104, and a wet cross direction tensile strength (WCDT) of 1.5 N / 25 mm or more and 8.0 N / 25 mm or less. If the WMDT or WCDT is less than 1.5 N / 25 mm, the kitchen towel sheet 1x, which has a high water absorption capacity as in the present application, will be prone to tearing upon absorbing water, while if the WMDT or WCDT exceeds 8.0 N / 25 mm, the density of the kitchen towel sheet 1x will be high and its water absorbency will be poor. The WMDT is preferably 2.0 N / 25 mm or more and 6.0 N / 25 mm or less, and more preferably 2.5 N / 25 mm or more and 4.5 N / 25 mm or less, and the WCDT is preferably 2.0 N / 25 mm or more and 6.0 N / 25 mm or less, and more preferably 2.5 N / 25 mm or more and 4.5 N / 25 mm or less. Furthermore, the ratio of WMDT to WCDT (WMDT / WCDT) is preferably 0.9 or more and 1.6 or less, more preferably 1.0 or more and 1.4 or less, and even more preferably 1.0 or more and 1.2 or less.

[0053] (ply peel strength) The ply peel strength of the kitchen towel sheet 1x is preferably 0.04 N / 75 mm or more and 2.1 N / 75 mm or less. If the ply peel strength is less than 0.04 N / 75 mm, the plies will peel off from each other, making wiping difficult, and if the ply peel strength is more than 2.1 N / 75 mm, the water absorption capacity of the kitchen towel sheet 1x will be poor. The ply peel strength of the kitchen towel sheet 1x is more preferably 0.10 N / 75 mm or more and 1.2 N / 75 mm or less, and even more preferably 0.15 N / 75 mm or more and 0.6 N / 75 mm or less. The ply peel strength was measured using a tensile testing machine (STB-1225S, manufactured by A&D Co., Ltd.) in accordance with the tensile test method of JIS P 8113, under the standard conditions specified in JIS P 8111. First, a test piece measuring 75 mm in the width direction and 200 mm in the machine direction was taken from the kitchen towel roll sample. Next, the ply was peeled 35 mm in the machine direction. One side of the peeled ply was clamped 15 mm in the machine direction between upper clamps (75 mm wide). The other ply was also clamped 15 mm in the machine direction between lower clamps (75 mm wide). The clamp pitch (spacing) was 20 mm. Next, the specimen was pulled (peeled) at a pulling speed of 100 mm / min, and strength data was collected. Data is obtained every 20 μm, and the data from 40 mm to 150 mm (measurement length 110 mm) after the start of measurement is averaged to obtain the peel strength (N / 75 mm). However, if the perforation is included in the distance from 40 mm to 150 mm after the start of measurement, the distance after the start of measurement can be shortened from 40 mm to, for example, 90 mm (measurement length 50 mm) as long as it does not include the perforation.

[0054] (Method of manufacturing kitchen towel sheets and kitchen towel rolls) The kitchen towel sheet 1x and kitchen towel roll 1 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing, and (3) roll winding. The manufacturing process preferably uses through-air dryer technology. In this case, a textured pattern derived from the papermaking process (fabric), different from the embossing pattern described above, is applied to the kitchen towel sheet 1x during the papermaking process. This textured pattern further increases the water absorption capacity of the kitchen towel sheet 1x. "Derived from the papermaking process" means that the textured pattern is applied between the headbox of the papermaking machine and the entrance of the Yankee dryer during the papermaking process of the kitchen towel sheet 1x. The textured pattern is formed by drying the sheet together with the fabric in the through-air dryer section. The unevenness pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the unevenness pattern will change the specific volume (paper thickness), but it is preferable to select a pattern that ensures that the specific volume (paper thickness) of the base paper falls within the numerical range described below. It is also preferable to select a pattern that ensures that the root mean square height Sq of the surface roughness of the non-embossed portion of the kitchen towel sheet 1x falls within the numerical range described above.

[0055] When using base paper made using this through-air dryer, the area ratio of the convex portions on the embossing roll for applying the embossing pattern is preferably 4% or more and 40% or less. If the area ratio is less than 4%, the plies tend to peel off from each other in the case of a kitchen towel sheet 1x with good water absorption as in the present application. If the area ratio exceeds 40%, the paper of the kitchen towel sheet 1x is crushed, resulting in poor water absorption. The area ratio of the convex portions is preferably 6% to 30%, and more preferably 9% to 18%. The shapes of the convex portions and embossments alone can be any shape, including circles, ellipses, rectangles, squares, floral patterns, logos, and letters, without any particular limitations. However, as mentioned above, linear embossments are preferred. As mentioned above, the embossments are preferably provided only on the surface 1a of the kitchen towel sheet 1x.

[0056] In this case, the basis weight of two plies of base paper used to manufacture one kitchen towel sheet (twice the basis weight of one ply) is 31 g / m 2 More than 58g / m 2 Preferably, it is 35 g / m or less. 2 More than 54g / m 2 More preferably, it is 39 g / m or less. 2 More than 50g / m 2 The paper thickness is preferably 1.4 mm / 10 sheets or more and 5.4 mm / 10 sheets or less, more preferably 2.1 mm / 10 sheets or more and 4.8 mm / 10 sheets or less, and even more preferably 2.7 mm / 10 sheets or more and 4.2 mm / 10 sheets or less. Furthermore, the specific volume is 7 cm 3 / g or more 22cm 3 / g or less is preferable, and 3 / g or more 20cm 3 / g or less is more preferable, and 12cm 3 / g or more 17cm 3 It is more preferable that the saturation coefficient is 1 / g or less.

[0057] The ratio of the embossing depth in the embossing pattern to the base paper thickness of the kitchen towel sheet 1x (i.e., the ratio of the embossing depth in the embossing pattern to the base paper thickness of the kitchen towel sheet 1x) is preferably 0.01 to 0.38, more preferably 0.03 to 0.33, and even more preferably 0.07 to 0.18. By setting the ratio within this range, in the case of a kitchen towel sheet 1x with good water absorption such as that of the present application, it is possible to reduce bulk, make ply peeling less likely, and improve water absorption. In addition, the difference between the specific volume of the kitchen towel sheet 1x and the specific volume of the base paper (the difference between the specific volume of the kitchen towel sheet 1x and the specific volume of the base paper) is -3cm, which is less likely to peel off and improves water absorption. 3 / g or more 2cm 3 / g or less is preferable, and -2cm 3 / g or more 1cm 3 / g or less is more preferable, and -1cm 3 / g or more 0.5cm3 / g or less is more preferable, and -0.5cm 3 / g or more 0cm 3 / g or less is particularly preferred.

[0058] It goes without saying that the present invention is not limited to the above-described embodiments, but covers various modifications and equivalents that fall within the spirit and scope of the present invention. [Example]

[0059] The kitchen towel sheets and kitchen towel rolls of Examples 1 to 27 and Comparative Examples 1 to 12 were manufactured through the steps of (1) papermaking and creping, (2) embossing, and (3) roll winding. One commercially available kitchen towel sheet and kitchen towel roll was also prepared. The above-mentioned parameters were measured and evaluated for all of the above Examples, Comparative Examples, and commercially available kitchen towel rolls. The number and thickness of the embossing patterns were changed as appropriate for each example and comparative example, and all embossings were provided only on the front side of the kitchen towel sheet. Specifically, the number of embossings was increased in comparative examples 7 to 18, while the number of embossings was not increased in examples 19 to 8, but the thickness of the embossings was increased. For products with a roll width other than 280 mm, including commercially available product 1, the roll mass is calculated per 280 mm roll width and recorded.

[0060] The produced kitchen towel sheets and kitchen towel rolls were evaluated for the following items. Basis weight: The basis weight of two plies of kitchen towel sheets was measured and evaluated as follows. 61g / m 2 More than: 1 point 54g / m 2 Over 61g / m 2 Below: 2 points 50g / m 2 Over 54g / m 2 Below: 3 points 46g / m 2 More than 50g / m 2 Below: 4 points 46g / m 2 Below: 5 points

[0061] Absorbency: 1m of 2-ply sheet using the method described above 2 Water absorption (g water / sheet m 2 ) was measured and evaluated as follows. 170 (water g / sheet m 2 ) or less: 1 point 170 (water g / sheet m 2 ) or more than 220 (water g / sheet m 2 ) or less: 2 points 220 (water g / sheet m 2 ) or more than 270 (water g / sheet m 2 ) or less: 3 points 270 (water g / sheet m 2 ) or more than 330 (water g / sheet m 2 ) or less: 4 points 330 (water g / sheet m 2 ) or more than 370 (water g / sheet m 2 ) or less: 5 points 370 (water g / sheet m 2 ) or more: 6 points

[0062] Not bulky: The paper thickness and roll diameter were measured using the method described above, and the evaluation was carried out as shown in Table 1 below.

[0063] [Table 1]

[0064] Replacement frequency: The winding length was measured and evaluated as follows. Less than 10m: 1 point 10m or more but less than 14m: 2 points 14m or more but less than 21m: 3 points 21m or more but less than 25m: 4 points 25m or more: 5 points

[0065] Wipeability (resistance to ply peeling): The peel strength of the ply was measured and evaluated as follows. Less than 0.01N / 75mm: 1 point 0.01N / 75mm or more and less than 0.04N / 75mm: 2 points 0.04N / 75mm or more and less than 0.10N / 75mm: 3 points 0.10N / 75mm or more and less than 0.15N / 75mm: 4 points 0.15N / 75mm or more: 5 points

[0066] The results obtained are shown in Tables 2 to 4.

[0067] [Table 2]

[0068] [Table 3]

[0069] [Table 4]

[0070] From the above, it can be seen that the kitchen towel roll of the present invention has good water absorption, is not bulky, does not peel off, and requires less frequent replacement, even when the basis weight is not excessively high and is within a certain range. [Explanation of symbols]

[0071] 1 kitchen towel roll 1a surface 1b back side 1e The outermost edge of the kitchen towel sheet 1x kitchen towel sheet 200 specimens 200a, 200d corner 210 Obi 220 Holder

Claims

1. A kitchen towel roll is a kitchen towel sheet formed by laminating two plies of embossed patterned sheets with glue, and winding the resulting sheet into a roll. The kitchen towel sheet has a pattern of protrusions and recesses derived from a papermaking process, which is different from the embossed pattern and is imparted between a head box of a papermaking machine and an inlet of a Yankee dryer, and does not have an embossed pattern on the back surface; The basis weight of the two plies is 30 g / m ２ 54g / m or more ２ The paper thickness is 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less, 2 ply 1m ２ The water absorption per unit is 270g or more and 550g or less, the root mean square height of the surface roughness in the portion where the embossed pattern is not applied is 35 μm or more; The kitchen towel roll has a roll length of 14 m or more and 44 m or less, and a roll diameter of 110 mm or more and 189 mm or less.

2. 2. The kitchen towel roll according to claim 1, wherein the two plies of the kitchen towel sheet have a water absorption capacity of 6 g or more per gram.

3. 1m between the two plies of the kitchen towel sheet ２ 3. The kitchen towel roll according to claim 1, wherein the amount of water absorbed per roll is 100 g or more and 300 g or less.

4. 4. The kitchen towel roll according to claim 1, wherein the embossing depth in the embossing pattern is 0.06 mm or more and 1.1 mm or less.

5. 5. The kitchen towel roll according to claim 1, wherein the ratio of the embossing depth in the embossing pattern to the overall paper thickness of the kitchen towel sheet is 0.02 or more and 0.4 or less.

6. The roll density of the kitchen towel roll is 0.04 g / cm ３ 0.15g / cm or more ３ 6. A kitchen towel roll according to any one of claims 1 to 5, characterized in that:

7. The winding density of the kitchen towel roll is 0.22 m / cm ２ 0.68m / cm or more ２ 7. A kitchen towel roll according to any one of claims 1 to 6, characterized in that:

8. 8. The kitchen towel roll according to claim 1, wherein an area ratio of the convex portions on an embossing roll for applying the embossing pattern is 4% or more and 40% or less.

9. 9. The kitchen towel roll of claim 1, wherein the embossed pattern is linear.

10. In the linear embossing pattern, the thickness of the embossing is 0.1 mm or more and 4 mm or less, and the length of the embossing is 5 mm or more, and the total length when the lengths of the embossings are added is 50 cm / 100 cm. ２ More than 550cm / 100cm ２ 10. The kitchen towel roll of claim 9, wherein:

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