kitchen towel roll

Abstract

To provide a kitchen towel roll that is bulky and decorative with a preferable sense of use, and has a good shape retention of a winding shape.SOLUTION: A kitchen towel roll is provided in which a sheet with an embossed pattern given therein is glued with glue, and a kitchen towel sheet where a specific volume bulk laminated in 2-ply is 7 cm3 / g or more and 22 cm3 / g or less is wound up into a roll. The kitchen towel sheet has an uneven pattern derived from a papermaking process unlike the embossed pattern. In the kitchen towel sheet, the basis weight of the 2-ply is 30 g / m2 or more and 54 g / m 2 or less, and a root mean square height of the surface roughness in a portion where the embossed pattern is not given is 35 μm or more and 170 μm or less. The kitchen towel roll is provided in which the winding softness outside the winding of the kitchen towel roll is 5 mm or more and 15 mm or less, and the winding softness inside the winding is 2 mm or more and 10 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, various types of kitchen towels have been developed. Water and oil absorption capacity is important for kitchen towels, and papermaking technologies 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 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. Patent Document 2 also describes a kitchen paper made by laminating multiple sheets, in which the sheets constituting the front and back surfaces are crepe paper made from pulp, and the sheet constituting the front surface is embossed and has a basis weight of 20 to 40 g / m. 2 , sheet density is 0.01g / cm 3 More than 0.14g / cm 3 The dry tensile strength in the machine direction is 2500cN or less, and the dry tensile strength in the cross direction is 700cN or less. The sheet constituting the back side has a basis weight of 20 to 50g / m 2 , sheet density is 0.14g / cm 3 More than 0.50g / cm 3 The following kitchen paper is disclosed. It also states that the sheets that make up the front and back surfaces of the kitchen paper are embossed, and that the tops of the embossments on each sheet are bonded together (also called pin-to-pin). 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] Special Publication No. 2011-506780 [Patent Document 2] Patent No. 4714290 [Patent Document 3] Special Publication No. 2016-540530 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when kitchen roll towels are manufactured using the above technology, the base paper itself is bulky and is embossed, which makes the roll loose, making it difficult to maintain the rolled shape during transportation or use, and sometimes reducing the product value. Generally, these problems can be addressed by adjusting the roll looseness by applying tension during winding, but bulky paper has a long distance between fibers, which reduces the strength of the web, resulting in poor productivity due to paper breakage and other problems.

[0006] Another solution is to use paper strength enhancers to compensate for the lack of strength, but this has problems such as slowing down the water absorption rate and making the paper stiff and uneasy to use.In addition, adjusting the pulp composition and beating degree can increase strength and make the paper tighter, but this causes the embossing and base paper to collapse (stretch), reducing the bulk, and damaging the bulk and decorative properties. As described above, it has been difficult to obtain a bulky embossed kitchen towel roll that is aesthetically pleasing, has a good feel when used, and has good shape retention when rolled.

[0007] Therefore, the present invention has been made in consideration of the above problems, and has an object to provide a kitchen towel roll that is bulky, has good aesthetic appeal and a pleasant feel when used, and has good shape retention when rolled up. [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 can be solved by applying a textured pattern different from an embossed pattern to a kitchen towel roll formed by winding a kitchen towel sheet having a specific volume within a specified range, and by adjusting the basis weight of the two plies of the kitchen towel sheet, the root mean square height of the surface roughness of a specified portion, and the winding softness of the kitchen towel roll both inside and outside the roll. Specifically, the present invention provides the following:

[0009] (1) The first aspect of the present invention is a sheet having an embossed pattern, which is glued and laminated in two plies with a specific volume of 7 cm 3 / g or more 22cm 3 a kitchen towel roll obtained by winding up a kitchen towel sheet having a basis weight of 30 g / m or less, the kitchen towel sheet having a concave-convex pattern derived from a papermaking process that is different from the embossed pattern, and two plies of the kitchen towel sheet having a basis weight of 30 g / m or less. 2 More than 54g / m 2Hereinafter, this kitchen towel roll is characterized in that the root mean square height of the surface roughness in the portion not provided with the embossed pattern is 35 μm or more and 170 μm or less, the looseness of the outer portion of the kitchen towel roll (a position corresponding to 10% of the winding length from the outer edge of the outermost turn of the kitchen towel roll when the kitchen towel roll is unwound) is 5 mm or more and 15 mm or less, and the looseness of the inner portion of the roll (a position corresponding to 90% of the winding length from the outer edge of the outermost turn of the kitchen towel roll when the kitchen towel roll is unwound) is 2 mm or more and 10 mm or less.

[0010] (2) A second aspect of the present invention is the kitchen towel roll according to (1), characterized in that the embossing depth in the embossing pattern is 0.06 mm or more and 1.1 mm or less.

[0011] (3) A third aspect of the present invention is a kitchen towel roll according to (1) or (2), 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.

[0012] (4) A fourth aspect of the present invention is a kitchen towel roll according to any one of (1) to (3), 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:

[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. [Effects of the Invention]

[0014] Therefore, according to the present invention, it is possible to provide a kitchen towel roll that is bulky, has a good aesthetic appearance and a good feel when used, and has good shape retention when rolled up. [Brief explanation of the drawings]

[0015] [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 a method for measuring the winding softness of a kitchen towel roll of the present invention. [Figure 3] FIG. 1 is a diagram showing an example of an embossing pattern in a kitchen towel roll of the present invention. [Figure 4] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 5] FIG. 1 is a graph showing a height profile on the XY plane obtained by a microscope. [Figure 6] FIG. 10 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 7] FIG. 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 8] 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

[0016] 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.

[0017] <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 together sheets with embossed patterns and laminating them into two plies, which is then wound into a roll. The kitchen towel sheet 1x is preferably perforated widthwise at equal intervals in the machine direction (not shown).

[0018] 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). Furthermore, the outer edge of the outermost roll of the kitchen towel sheet 1x (end of winding) is referred to as outer edge 1e. In this case, the MD (Machine Direction) direction is the direction in which the kitchen towel sheet 1x is wound (the direction in which the kitchen towel sheet 1x is manufactured, also called the flow direction), and the CD (Cross Direction) direction is the direction perpendicular to the MD direction (also called the width direction).

[0019] (winding length and winding diameter) The roll length of the kitchen towel roll 1 is preferably 14 m or more and 44 m or less. The roll diameter DR of the kitchen towel roll 1 is preferably 110 mm or more and 189 mm or less. A roll length of less than 14 m results in poor retention of the roll shape, while a roll length of more than 44 m results in high roll density and low bulk. A roll diameter DR of less than 110 mm results in high roll density and low bulk, while a roll diameter DR of more than 189 mm results in poor retention of the roll shape and a low roll density, resulting in a poor usability despite the bulk.

[0020] The winding length is more preferably 21 m or more and 37 m or less, and even more preferably 25 m or more and 33 m or less. The winding diameter DR is more preferably 130 mm or more and 176 mm or less, and even more preferably 140 mm or more and 163 mm or less. To determine the roll length, first measure the length of 10 kitchen towel sheets 1x between the perforations of kitchen towel roll 1. Then, measure the number of sheets in 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, the roll length can be measured by measuring it. The roll diameter DR is measured using a diameter ruler manufactured by Muratec KDS Co., Ltd. 10 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 bulky kitchen towel roll 1 such as the present application, the area used is appropriate, resulting in a good usability.

[0021] (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 keeping the width within this range, when using a bulky kitchen towel roll 1 such as that of the present application, the area used will be appropriate, resulting in a good usability. 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 mass within this range, when using a bulky kitchen towel roll 1 such as that of the present application, it can be made compact and comfortable to use. 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.

[0022] (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 roll shape of the kitchen towel roll 1 cannot be maintained. 3 or the winding density is 0.68m / cm 2 If the temperature exceeds this range, the bulk of the kitchen towel roll 1 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:

[0023] 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 a kitchen towel roll 1 per 280 mm of roll width. The 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)] × roll width (converted to 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's 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.

[0024] (Core outer diameter) Furthermore, the core outer diameter DI, which is the outer diameter of the core 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. Having the core outer diameter DI within the above range makes it easier to optimize the winding softness both inside and outside the roll. Furthermore, because the kitchen towel roll 1 maintains its wound shape without being bulky, the kitchen towel roll 1 can be easily stored in a kitchen towel holder, and the kitchen towel roll 1 is also easy to handle during production. The core outer diameter is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Ten kitchen towel rolls 1 are measured and the measurement results are 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.

[0025] (Rolling softness) Furthermore, the outer looseness of the kitchen towel roll 1 is 5 mm or more and 15 mm or less, and the inner looseness is 2 mm or more and 10 mm or less. If the outer looseness is less than 5 mm or the inner looseness is less than 2 mm, the kitchen towel sheet 1x will be crushed when in rolled form, resulting in low water absorbency. If the outer looseness is more than 15 mm or the inner looseness is more than 10 mm, the roll will be too loose and will not be able to maintain its rolled shape. In this case, "outside of the roll" refers to a position that is 10% of the roll length from the outer edge 1e of the outermost roll of kitchen towel roll 1 when kitchen towel roll 1 is unwound, and "inside of the roll" similarly refers to a position that is 90% of the roll length from the outer edge 1e of the outermost roll of kitchen towel roll 1 when kitchen towel roll 1 is unwound. The outer looseness of kitchen towel roll 1 is preferably 6 mm to 13 mm, and more preferably 7 mm to 11 mm. The inner looseness of kitchen towel roll 1 is preferably 3 mm to 9 mm, and more preferably 4 mm to 8 mm. The rolling softness is measured by the following method.

[0026] The winding looseness can be defined as the amount of deformation of the kitchen towel roll 1 when a load of 625 g is applied to the kitchen towel roll 1. More specifically, the winding looseness is measured using a measuring device 40 shown in FIG. 2. The measuring device 40 includes a base 41, support rods 42a and 42b, a movable weight support plate 43, and a 625 g weight 44. The two support rods 42a and 42b extend vertically from the base 41, and insertion holes for the support rods 42a and 42b are provided at both ends of the rectangular movable weight support plate 43. The kitchen towel roll 1 is placed between the support rods 42a and 42b on the base 41. The support rods 42a and 42b are inserted into the movable weight support plate 43 from above the kitchen towel roll 1, and the movable weight support plate 43 is placed on the top of the kitchen towel roll 1. The height of the movable weight support plate 43 in this state is defined as the initial height h1. When weight 44 is placed on movable weight mounting plate 43, the weight of weight 44 causes movable weight mounting plate 43 to slide along support rods 42a and 42b, deforming and sinking kitchen towel roll 1. Height h2 at this point is measured, and (h2 - h1) is calculated as the amount of deformation in the diameter of kitchen towel roll 1. Next, kitchen towel roll 1 is rotated 120 degrees, and the same procedure is used to calculate the winding looseness. It is then rotated another 120 degrees, and the same procedure is repeated. The average of these three measurements is used as the measurement value.

[0027] <Kitchen towel sheet> (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 kitchen towel sheet will become stiff and difficult to wipe with. 2 More than 50g / m 2 Preferably, it is 38 g / m or less. 2 More than 46g / m 2 The basis weight is measured in accordance with JIS P 8124.

[0028] 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.

[0029] (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 kitchen towel sheet 1x will have a poor feel when used, and if it exceeds 5 mm / 10 sheets, the feel will be poor despite its 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. 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 and a probe diameter of 30 mm. The sample is placed between the probe and the measuring table, and the gauge is read when the probe is lowered at a speed of 1 mm per second or less. Five sets of 1x kitchen towel sheets, each laminated in two plies, are stacked together to make a total of 10 sheets, and measurements are taken. The measurement is also repeated 10 times at different locations, and the results are averaged.

[0030] (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.

[0031] 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 ply peeling in 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. 3, 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 line-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. Using such a pattern can improve the feel of use in a bulky kitchen towel sheet 1x such as the present application, provide excellent aesthetic appeal, and help the kitchen towel roll 1 maintain its rolled shape.

[0032] 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 2 It 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 one embossed pattern, as shown in Figure 3, and then adding them up to 100 cm. 2The total length per square E is defined as 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, a bulky kitchen towel sheet 1x such as that of the present application can be made to have a good usability and at the same time have good cosmetic properties. The total length is determined by actual measurement using the method described above, but it may also be measured using a general microscope.

[0033] 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 aesthetic appeal of the kitchen towel roll 1 will be poor. If the depth is more than 1.1 mm, the kitchen towel roll 1 will become loose and will not be able to maintain its rolled shape. 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.

[0034] The depth of the embossment is measured using a microscope. The microscope used can be a Keyence One-Shot 3D Measuring Microscope 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 needed depending on the desired size of the embossment.

[0035] Figure 4 shows a height profile on the XY plane taken with a microscope, with the height of the surface of the kitchen towel sheet 1x represented by shading. The linear areas in Figure 4 that are different in shading from the surrounding area represent individual embossments. The depth of the embossment is determined by measuring the height difference of the embossments 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 4 to obtain the height profile shown in Figure 5. 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.

[0036] Therefore, the (measured) cross-sectional curve S in Figure 5 was smoothed using the weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 6. 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 6, the average of the maximum values ​​on the vertical axis of the convex portion H1 and the convex portion H2 adjacent to the convex portion H1 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 6, 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). (At this point, two measurement results were obtained.) 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.

[0037] 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 aesthetic appeal of the kitchen towel roll 1 will be poor. If the ratio exceeds 0.4, the kitchen towel roll 1 will become loosely wound and will not be able to maintain its rolled shape. 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 or more and 0.35 or less, and even more preferably 0.08 or more and 0.20 or less.

[0038] 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 embossing pattern resulting from the papermaking process. Nested embossing, pin-to-pin embossing, or no embossing is acceptable, but 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 embossing, but when using thick base paper as in the present application, as mentioned above, embossing can cause the paper to collapse, resulting in poor aesthetic appeal. For this reason, it is preferable that the front surface 1a be linearly embossed and the back surface 1b be unembossed.

[0039] 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 35 μm to 170 μm, preferably 50 μm to 150 μm, and more preferably 60 μm to 100 μm. If the root mean square height Sq of the surface roughness is less than 35 μm, the kitchen towel sheets 1x will slip against each other when wound into a roll, making it impossible to maintain the rolled shape. If Sq exceeds 170 μm, the kitchen towel roll 1 will become loose and will not be able to maintain its rolled shape. 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 Microscope 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.

[0040] For the image obtained in Figure 7, 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 is set 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.

[0041] (Water absorption amount) In the present invention, 1 m of 2 plies of kitchen towel sheet 1x 2 It is preferable that the water absorption per unit weight is 220 g or more and 600 g or less. 2 If the water absorption per unit is less than 220g, the feel of the kitchen towel sheet 1x will be poor, and if it exceeds 600g, the thickness of the kitchen towel sheet 1x will be too thick and the aesthetic appeal will be poor. 2 The amount of water absorption per unit is more preferably 270 g or more and 550 g or less, and even more preferably 370 g or more and 480 g or less. Furthermore, the water absorption per gram (per unit weight) 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 kitchen towel sheet 1x will have a poor feel when used. The water absorption per gram is more preferably 7 g to 14 g, and even more preferably 8 g to 12 g.

[0042] 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 unit area is less than 100g, the feel of the kitchen towel sheet 1x will be poor, and if it exceeds 300g, the thickness of the kitchen towel sheet 1x will be too thick and bulky, resulting in poor aesthetics. 2 The water absorption per unit is 1m of 2 plies. 2 From the amount of water absorption per 1m of 1 ply (surface 1a) described later, 2 Water absorption per ply (back side 1b) and 1m 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.

[0043] FIG. 8 shows a method for measuring the water absorption of a kitchen towel roll 1 of the present invention. 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 200 with each side measuring 7.6 cm. The mass of the test piece 200 before water absorption is measured using an electronic balance. The test piece 200 is set in a holder 220 (a jig that fixes three points of the test piece 200, made of a metal that does not absorb water). Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test specimen 200 set in the holder 220 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test specimen 200 and holder 220 are removed from the distilled water, and as shown in Figure 8, a band 210 is attached to one corner 200d of the test specimen 200. The band 210 is made by cutting a kitchen towel sheet 1x 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 the corner 200d toward the center. Next, the holder 220 and test specimen 200 are hung from a rod placed in an empty water tank with the corner 200a opposite corner 200d facing up, and the tank lid is closed and left for 10 minutes. Thereafter, the holder 220 and the test piece 200 are taken out of the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured using an electronic balance. 2 Absorption of distilled water per sheet (g water / sheet m 2 ) is calculated. 2 Water absorption per sheet (g water / sheet m 2 ) by the basis weight of the two plies of the test piece 200, 2 Water absorption per sheet (g water / sheet 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.

[0044] In the present invention, 1 m of 1 ply (surface 1a) of the kitchen towel sheet 1x 2The 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.

[0045] (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 one kitchen towel sheet is 7cm 3 If the thickness is less than 22cm / g, the required bulkiness for one kitchen towel sheet cannot be achieved. 3 If the volume exceeds 9 cm / g, the product will be bulky and feel poor in use. 3 / g or more 20cm 3 / g or less, and 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:

[0046] (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 to 21 N / 25 mm, and a dry cross direction tensile strength (DCDT) of 4.5 N / 25 mm to 21 N / 25 mm, both based on JIS P 8113. If the DMDT or DCDT is less than 4.5 N / 25 mm, the kitchen towel sheet 1x will be prone to tearing when absorbing water, resulting in a poor feel in use. If the DMDT or DCDT exceeds 21 N / 25 mm, the density of the kitchen towel sheet 1x will be high, making it stiff and resulting in a poor feel in use. The DMDT is preferably 6.0 N / 25 mm or more and 17 N / 25 mm or less, and more preferably 7.5 N / 25 mm or more and 12 N / 25 mm or less, and the DCDT is preferably 6.0 N / 25 mm or more and 17 N / 25 mm or less, and more preferably 7.5 N / 25 mm or more and 12 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.

[0047] (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, and a wet cross direction tensile strength (WCDT) of 1.5 N / 25 mm or more and 8.0 N / 25 mm or less, based on the old JIS S 3104. If the WMDT or WCDT is less than 1.5 N / 25 mm, in a kitchen towel sheet 1x with high water absorption as in the present application, the kitchen towel sheet 1x will be prone to tearing upon absorption and will have a poor feel in use. If the WMDT or WCDT exceeds 8.0 N / 25 mm, the density of the kitchen towel sheet 1x will be high, making it stiff and poor in use. 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.

[0048] (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, resulting in a poor usability, while if the ply peel strength exceeds 2.1 N / 75 mm, the kitchen towel sheet 1x will be stiff and result in a poor usability. 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.

[0049] (Method of manufacturing kitchen towel sheets and kitchen towel rolls) Kitchen towel sheets 1x and kitchen towel rolls 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 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.

[0050] 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% to 40%. If the area ratio is less than 4%, the decorative properties of the kitchen towel sheet 1x and kitchen towel roll 1 will be poor. If the area ratio is more than 40%, the bulk will be low and the water absorption will be poor. 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 themselves can be any shape, including circular, oval, rectangular, square, floral, logo, and lettering, without any particular limitations. However, as mentioned above, linear embossing is preferred. As mentioned above, the embossing is preferably provided only on the surface 1a of the kitchen towel sheet 1x.

[0051] 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.

[0052] The ratio of the embossing depth in the embossing pattern to the thickness of the base paper of the kitchen towel sheet 1x (the ratio of the embossing depth in the embossing pattern to the thickness of the base paper 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 keeping it within this range, in the case of a bulky kitchen towel sheet 1x such as that of the present application, it is possible to improve the feel of use and also improve the aesthetic appeal. 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 -3 cm 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 0.5cm 3 / g or less is more preferable, and -0.5cm 3 / g or more 0cm 3 / g or less is particularly preferred.

[0053] 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]

[0054] Through the steps of (1) papermaking and creping, (2) embossing, and (3) rolling, kitchen towel sheets and kitchen towel rolls of Examples 1 to 21 and Comparative Examples 1 to 10 were manufactured. The above-mentioned parameters were measured and evaluated for the kitchen towel rolls of all of the above Examples and Comparative Examples. The number and thickness of the embossing patterns were changed as appropriate for each example and comparative example, and all embossing was performed only on the front side of the kitchen towel sheet. For rolls with widths other than 280 mm, the roll mass was calculated per 280 mm width and reported.

[0055] The produced kitchen towel sheets and kitchen towel rolls were evaluated for the following items.

[0056] (Maintaining the roll shape) Ten kitchen towel rolls were dropped from a height of 75 cm with the height of the rolls perpendicular to the ground, and an evaluation was conducted to see if they maintained their rolled shape (without deviation of 3 mm or more). ⊚: The roll shape was maintained for 9 to 10 rolls. ◯: The roll shape was maintained for 8 to 7 rolls. △: The roll shape was maintained for 6 to 5 rolls. ×: The rolled shape was maintained for 3 to 4 rolls. XX: The roll shape was maintained for 2 to 0 rolls.

[0057] (cosmetic) Twenty monitors visually evaluated the appearance of the kitchen towel rolls by selecting "good" or "bad." The evaluation criteria were as follows, with ◎, ○, and △ being considered acceptable. ◎: When 18 to 20 people answered "good." ○: When 14 to 17 people answered "good." △: When 10 to 13 people answered "good." ×: When 6 to 9 people answered "good." ××: When there are no "good" people or when there are more than 1 but less than 5 people.

[0058] (Water absorption) When using the kitchen towel sheet, the monitors were asked to evaluate whether the sheet was able to wipe away water sufficiently by selecting "sufficient" or "insufficient." The evaluation criteria were as follows, with ◎, ○, and △ being considered as passing. ◎: When "sufficient" is between 18 and 20 people. ○: When "sufficient" is between 14 and 17 people. △: When "sufficient" is between 10 and 13 people. ×: When "sufficient" is between 6 and 9 people. ××: When there are not enough people or when there are more than 1 person but less than 5 people.

[0059] (wipeability) The monitors evaluated the ease of wiping when using the kitchen towel sheet by selecting "easy" or "difficult." The evaluation criteria are as follows, with ◎, ○, and △ being considered pass. ◎: When 18 to 20 people say it's "easy." ○: When 14 to 17 people say it's "easy." △: When 10 to 13 people say it's "easy." ×: When 6 to 9 people think it's "easy." ××: When there are no people who find it easy to do something, or when there are more than 1 person but less than 5 people.

[0060] The results obtained are shown in Tables 1 to 3.

[0061] [Table 1]

[0062] [Table 2]

[0063] [Table 3]

[0064] From the above, it can be seen that the kitchen towel roll of the present invention is bulky, has good aesthetic appeal and a pleasant feel when used, and has good shape retention when rolled up. [Explanation of symbols]

[0065] 1 kitchen towel roll 1a surface 1b back side 1e The outer edge of the outermost roll of the kitchen towel sheet 1x kitchen towel sheet 40 Measuring Equipment 41 Base 42a, 42b Support rod 43 Moving weight support plate 44 Weight 200 specimens 200a, 200d corner 210 Obi 220 Holder

Claims

1. The sheet with the embossed pattern is glued and laminated in two plies to form a sheet with a specific volume of 7 cm ３ / g or more 22cm ３ A kitchen towel roll obtained by winding up a kitchen towel sheet having a viscosity of 1 / g or less into a roll, The kitchen towel sheet has a concave-convex pattern derived from a papermaking process that is different from the embossed pattern, the embossing pattern is a linear embossing pattern, the total length of the embossments in the linear embossing pattern, each having 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 or more and 550 cm / 100 cm 2 or less; The basis weight of the two plies of the kitchen towel sheet is 30 g / m ２ 54g / m or more ２ the root mean square height of the surface roughness in the portion where the embossed pattern is not applied is 35 μm or more and 170 μm or less, The looseness of the outer portion of the kitchen towel roll (a position corresponding to 10% of the length from the outer edge of the outermost turn of the kitchen towel roll when the kitchen towel roll is unwound) is 5 mm or more and 15 mm or less, and the looseness of the inner portion of the roll (a position corresponding to 90% of the length from the outer edge of the outermost turn of the kitchen towel roll when the kitchen towel roll is unwound) is 2 mm or more and 10 mm or less, A kitchen towel roll having a winding density of 0.28 m / cm 2 or more and 0.40 m / cm 2 or less.

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

3. 3. 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.

4. 4. 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.

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