Kitchen towel roll

Abstract

To provide a kitchen towel roll having favorable water absorption, no bulkiness, no ply peeling, and less frequent replacement even under conditions where the basis weight is within a certain range without being excessively high.SOLUTION: A kitchen towel roll is formed by rolling kitchen towel sheets into a roll, the kitchen towel sheets with embossed patterns applied thereto, glued together and laminated into two plies, where the kitchen towel sheets include concavo-convex patterns different from the embossed patterns, derived from a papermaking process. The kitchen towel roll is characterized in that the basis weight of the two plies is 30 g / m2 or more and 54 g / m2 or less, the paper thickness is 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less, the water absorption amount per m2 of the two plies is 220 g or more an 600 g or less, the wound length of the kitchen towel roll is 14 m or more and 44 m or less and the wound diameter is 110 mm or more and 189 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

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

[0003] For example, Patent Document 1 describes a paper liner that contains pulp as a main component, is made of one or more sheets stacked together, and has a basis weight of 15 to 50 g / m 2 The kitchen towel 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 avoiding the embossing performed mechanically in a process other than the papermaking 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 the kitchen towel is made by applying dry crepe, and a method for producing the same is disclosed. Patent document 2 also discloses an uneven layer of an uneven belt for unevenly unevenly applying unevenness to a wet fibrous web by pressing it in the press section of a tissue papermaking machine for producing high-bulk tissue paper, the uneven 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 a 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, the method comprising the steps of preparing at least one paper web and embossing the at least one web with an embossed pattern covering at least about 22% of the total surface area of ​​the at least one web, the pattern including at least about 80% linear embossings, and the caliper of the finished product being 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 differs depending on the embossing pattern, and it was difficult to improve the amount of water absorption using only the above papermaking technology. In particular, when using thick base paper obtained using the above papermaking technology, it was found that if embossing is applied in the same way as with normal base paper, the paper in the embossed area will be crushed, resulting in a decrease in 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 technology that increases the bulkiness of base paper, it was found that it is difficult to improve the amount of water absorption using the general concept of embossing.

[0006] Therefore, if the number of embossed parts is reduced, the ply will peel off when water is absorbed, causing the paper to tear and poor wiping properties. In other words, unlike normal towel base paper, when the base paper made using the above papermaking technology is used, the amount of water absorbed increases, causing the ply to peel off and the paper to tear easily. 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 has an object to provide a kitchen towel roll that has good water absorption, is not bulky, does not peel off, and requires less frequent replacement, even under conditions where the basis weight is not excessively high and is within a certain range. [Means for solving the problem]

[0008] The inventors of the present invention conducted extensive research to solve the above problems. As a result, they discovered that the above 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 of the kitchen towel sheet, as well as the roll length and roll 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 in which a sheet having an embossed pattern is glued and laminated into two plies, and the resulting kitchen towel sheet is wound into a roll. The kitchen towel sheet has a convexo-concave pattern 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 1m2 sheet of 2 ply paper with a thickness of 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less: 2 The kitchen towel roll is characterized in that the water absorption per unit area is 220 g to 600 g, the roll length is 14 m to 44 m, and the roll diameter is 110 mm to 189 mm.

[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), 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 overall paper thickness of the 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 in that:

[0015] (7) The seventh aspect of the present invention is the 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 in that:

[0016] (8) An 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 in 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) The tenth aspect of the present invention is the kitchen towel roll according to (9), wherein the total length of the embossments, which are embossed in the linear embossing pattern and have a width of 0.1 mm to 4 mm and a length of 5 mm or more, is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 It is characterized in that:

[0019] (11) An 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 having the embossed pattern is 35 μm or more.

[0020] (12) A 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. Effect of the Invention

[0021] Therefore, according to the present invention, even if the basis weight is not excessively high and is within a certain range, a kitchen towel roll can be provided that has good water absorption, is not bulky, does not peel off, and requires less frequent replacement. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view showing the appearance of a kitchen towel roll of the present invention. [Diagram 2] FIG. 2 is a diagram showing an example of an embossing pattern in the kitchen towel roll of the present invention. [Diagram 3] FIG. 1 is a diagram showing a height profile on an XY plane taken by a microscope using shading. [Figure 4] FIG. 1 is a graph showing a height profile on an XY plane obtained by a microscope. [Diagram 5]FIG. 13 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 6] FIG. 13 is a diagram showing, by using shading, the height profile of a non-embossed portion on the XY plane as viewed by a microscope. [Figure 7] FIG. 2 is a diagram showing a method for measuring the water absorption of the kitchen towel roll of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the embodiments of the present invention will be described in detail. However, the following embodiments are presented for the purpose of illustration, and the present invention is not limited to the embodiments shown below.

[0024] <Kitchen towel roll> Fig. 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 formed by gluing a sheet having an embossed pattern and laminating it into two plies, and then winding the resulting sheet into a roll. It is preferable that the kitchen towel sheet 1x is perforated in the width direction at equal intervals in the machine direction.

[0025] Also, as shown in FIG. 1, of the surfaces of kitchen towel sheet 1x, the surface facing the outside of the roll is referred to as surface 1a (the surface of kitchen towel sheet 1x), and the surface facing the center of the roll is referred to as back surface 1b (the back surface of kitchen towel sheet 1x).

[0026] (Roll length and 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 is bulky. If the roll diameter DR is less than 110 mm, the water absorption capacity is poor or the roll length is short and the roll needs to be replaced more frequently, and if the roll diameter DR exceeds 189 mm, the roll is bulky or the roll density is low, so that the water absorption capacity is not improved 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 measured by measuring the length of 10 sheets of kitchen towel sheets 1x between the perforations of kitchen towel roll 1. After that, 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 the number of sheets is 150, 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 actual measurement. The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring 10 kitchen towel rolls 1, and the measurement results are averaged. Furthermore, the length between the 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 it 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 can be improved.

[0028] (Roll width and roll weight) 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 having good water absorption as in the present application, the area used becomes appropriate, and the amount of water absorption can be improved. 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 setting the roll mass within this range, when using the kitchen towel roll 1 having good water absorption properties as in the present application, the roll can be replaced more frequently without becoming bulky. The roll mass is the mass per 280 mm of roll width, not including the core (paper tube). If the roll width is not 280 mm, it is converted to the mass per 280 mm by proportional calculation.

[0029] (Roll density and winding density) The roll density of kitchen towel roll 1 is 0.04g / cm 3 More than 0.15g / cm 3 The winding density is preferably 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 amount is not improved even though the kitchen towel roll 1 is bulky. 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 will be poor. The roll density of kitchen towel roll 1 is 0.05 g / cm 3 More than 0.13g / cm 3 It is preferable that the concentration 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 even 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 (paper 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 outer diameter (winding diameter DR) part of the roll} - (cross-sectional area of ​​the outer diameter part of the core)] × 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 outer diameter of the core 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 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 2 plies of 1x kitchen towel sheet is 30g / 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 54g / m, the water absorption capacity of one kitchen towel sheet is inferior. 2 If the weight of the two plies of the kitchen towel sheet 1x exceeds 34 g / m2, the production cost of the kitchen towel roll 1 will be high. 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 not more than 1000 g / m2. The basis weight is measured based on JIS P 8124.

[0032] In addition, the basis weight per ply of the kitchen towel sheet 1x is 14 g / m2 for both the front surface 1a and the back surface 1b. 2 More than 28g / m 2 It is preferable that the thickness is less than 16 g / m 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 weights of two plies, peeling the plies, measuring the masses of the front surface 1a and the back surface 1b, and calculating the basis weights 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 / m2 or more higher than the basis weight of the surface 1a. 2 More than 0.8g / m 2 The higher the better, 0.2 g / m 2 More than 0.5g / m 2 The higher the value, the more preferable it is.

[0033] (paper thickness) The thickness of the kitchen towel sheet 1x is 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less. If the thickness is less than 1.3 mm / 10 sheets, the water absorption of the kitchen towel sheet 1x is poor, and if the thickness exceeds 5 mm / 10 sheets, the water absorption is not improved despite the bulk. The 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 thickness of the paper 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 measuring probe diameter of 30 mm, a sample is placed between the measuring probe and the measuring table, and the gauge is read when the measuring probe is lowered at a speed of 1 mm or less per second. Five sets of kitchen towel sheets 1x laminated in 2 plies are stacked and measured as 10 sheets. The measurement is also repeated 10 times at different locations and the 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. The kitchen towel sheet 1x of the present invention is laminated into two plies after embossing. When laminating the two plies, a ply bond glue is used and glue is applied to bond them together. By bonding them together to form two plies in this way, the adhesion between the plies becomes stronger, and the kitchen towel sheet 1x is less likely to tear or peel off even when it gets wet.

[0035] The ply on the surface 1a of the kitchen towel sheet 1x is provided with an embossed pattern. By providing the embossed pattern on the surface 1a, the embossed portion of the embossed pattern can be applied with glue for adhesion treatment, so that the ply of the kitchen towel sheet 1x is less likely to peel off, and the water absorption can be kept within a certain range. The embossed pattern is not particularly limited as long as it is a pattern that is generally applied to kitchen towels, such as a dot pattern or a line pattern, but is preferably a linear embossed pattern. The linear embossed pattern is not particularly limited as long as one pattern includes two types of figures, namely, a figure having a substantially circular shape and another pattern inside, and a figure that is substantially linearly symmetrical in the vertical and horizontal directions as a whole and includes a combination of multiple curves and figures, as shown in FIG. 2. As for the substantially circular shape, it is preferable that the substantially circular shape is doubled. As for the dimensions of the embossed pattern, 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 length direction of this rectangle E is preferably parallel to the flow direction of the kitchen towel roll 1, and the width direction is preferably parallel to the width direction of the kitchen towel roll 1, but may be inclined. By using such a pattern, in the kitchen towel sheet 1x having a high water absorption capacity as in the present application, the water absorption capacity can be improved, and the ply is less likely to peel off, 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 plus the length of the embossing is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 Preferably less than 80cm / 100cm 2 More than 410cm / 100cm 2 More preferably, it is 110cm / 100cm or less. 2 More than 300cm / 100cm 2It is even more preferable that: The above total length is measured by adding up the lengths of all embossments with a thickness of 0.1 mm to 4 mm and a length of 5 mm or more inside a rectangle E that includes one embossed pattern as shown in Figure 2, and the total length is 100 cm. 2 The total length per square is defined as the total length per unit area. The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. If an embossed pattern adjacent to an embossed pattern included in a rectangle that includes all the embossed patterns is included in the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length. If the size of one side of the rectangle E cannot be clearly determined by the embossed pattern, the size of the rectangle E is set to 10 x 10 cm, and the total length of the embossed length included in this rectangle E is measured. By setting the total length within the above range, the water absorption can be improved in the kitchen towel sheet 1x having high water absorption as in the present application, and the ply is less likely to peel off, resulting in good wiping properties. The total length is determined by actual measurement using the above-mentioned method. It is also possible to measure 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 having high water absorption as in the present application. If the depth exceeds 1.1 mm, the specific volume of the kitchen towel sheet 1x becomes high, and it becomes difficult to improve the water absorption capacity despite the 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 further preferably 0.20 mm or more and 0.55 mm or less.

[0038] The depth of the embossing is measured using a microscope. As a microscope, a product name "One Shot 3D Measuring Macroscope VR-3100" manufactured by KEYENCE Corporation can be used. As software for observing, measuring, and analyzing microscope images, a product name "VR-H1A" can be used. The measurement conditions are a magnification of 25 times and a field of view area of ​​12 mm x 9 mm. The measurement magnification and field of view area may be changed as appropriate depending on the desired size of the embossing.

[0039] FIG. 3 shows a height profile on the XY plane taken by a microscope, and the height of the surface of the kitchen towel sheet 1x is represented by shading. The linear areas in FIG. 3 that are shaded differently from the surroundings indicate 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. In addition, when measuring, three turns of the kitchen towel sheet 1x are removed from the kitchen towel roll 1, and the fourth turn of the kitchen towel sheet 1x is used to measure the two-ply sheet. In addition, if there are perforations, all of them are avoided during the measurement. First, a line segment AB is drawn as shown in FIG. 3 to obtain a height profile as shown in FIG. 4. The line segment AB may be drawn so as to cross the embossments. The line segment AB is drawn in the width direction (CD direction) of the kitchen towel sheet 1x, but if the interval between the embosses is narrow, for example, 2 mm or less, and the height of the convex portion described below becomes low, the line segment may be drawn diagonally or in the flow direction. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sample surface of the kitchen towel sheet 1x, but it also includes noise (steep peaks due to fiber clumps on the surface of the kitchen towel sheet 1x, fibers that grow in a whisker-like shape, or areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness.

[0040] Therefore, the (measured) cross-sectional curve S in FIG. 4 is smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the cross-sectional curve W in FIG. 5. The smoothing using the filter of the weighted average radio button can be obtained automatically by using the above-mentioned analysis software. Then, in the graph shown in FIG. 5, the average value of the maximum values ​​on the vertical axis of the graph's convex part H1 and the convex part H2 adjacent to the convex part H1 is calculated, and the minimum value on the vertical axis of the concave part D1 sandwiched between the convex parts H1 and H2 is obtained. The value obtained by subtracting the minimum value from the average value of the maximum values ​​thus obtained is set as the provisional emboss depth. Then, as shown in FIG. 5, similar measurements are performed on a total of two consecutive locations on the cross-sectional curve (a total of two consecutive locations of the concave part D1 and the concave part D2 sandwiched between the convex parts H3 and H4) (two measurement results are obtained at this point). After that, kitchen towel roll 1 is rotated 90 degrees three times in the flow direction of kitchen towel sheet 1x, and the same measurement as above is taken at each position (a total of four measurement positions in the flow direction), and the average value of the total eight positions (2 x 4) is ultimately used as the embossing depth. In addition, since the kitchen towel sheet 1x of the present invention has a convex-concave pattern derived from the papermaking process that is different from the embossed pattern, there is variation in the height of the convex parts on the left and right sides that sandwich the concave part. Therefore, when the difference in the vertical axis between the convex parts that sandwich the concave part (for example, the convex parts H3 and H4 that sandwich the concave part D2) is 0.2 mm or more, the measurement is performed at a location that avoids that part.

[0041] Furthermore, the ratio of the embossing depth in the embossing pattern to the overall paper thickness of the kitchen towel sheet 1x, that is, 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 to 0.4. 2The water absorption per unit area is low, the overall water absorption is poor, and the plies are easily peeled off. If the ratio exceeds 0.4, the water absorption is not improved as the sheet 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 ply on the back surface 1b of the kitchen towel sheet 1x has an embossed pattern, as long as it has a pattern of protrusions and recesses derived from the papermaking process that is different from the embossed pattern. It may be nested embossed or pin-to-pin embossed, or may not be embossed, but nested embossed or no embossed is preferred, and no embossed is more preferred. Conventional kitchen towels ensure water absorption by using pin-to-pin or nested formats, but when using thick base paper as in the present application, as mentioned above, the paper is crushed by providing embossing, and the water absorption decreases. For this reason, it is preferred that the front surface 1a is linearly embossed and the back surface 1b is no embossed.

[0043] At this time, the surface roughness root mean square height Sq of the kitchen towel sheet 1x in the part where the embossed pattern is not applied (hereinafter also referred to as the non-embossed part) is preferably 35 μm or more, more preferably 50 μm or more and 150 μm or less, even more preferably 60 μm or more and 120 μm or less, and particularly preferably 70 μm or more and 90 μm or less. If the surface roughness root mean square height Sq is less than 35 μm, the absorbency is poor. In addition, the upper limit of the surface roughness root mean square height Sq is not particularly limited, but if the value is too high, it 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 emboss depth described above, a microscope with the product name "One Shot 3D Measuring Macroscope VR-3100" manufactured by KEYENCE Corporation can be used. The product name "VR-H1A" can be used as software for observing, measuring, and analyzing microscope images. The measurement conditions are a magnification of 38 times and a field of view area of ​​8 mm x 6 mm. The measurement magnification and field of view area may be changed as appropriate depending on the desired size of the emboss.

[0044] For the obtained image shown in Figure 6, a filter is set in the same way as for the embossing depth described above. Specifically, an S-filter (low pass filter) is set to remove components with a scale smaller than the cutoff wavelength from the image, and an L-filter (high pass filter) is set to remove components with a scale larger than the cutoff wavelength. 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 turns of kitchen towel sheet 1x from kitchen towel roll 1, and using the fourth turn 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 kitchen towel roll 1 is rotated 90 degrees three times in the flow direction of kitchen towel sheet 1x, and the same measurements are taken at each location (a total of four measurement locations in the flow direction), and the average value of the total eight locations (2 x 4) is finally adopted as the root mean square height Sq.

[0045] (Water absorption) In the present invention, 1m of 2 plies of kitchen towel sheet 1x 2 The water absorption capacity per unit is 220g to 600g. 2If the water absorption per unit area 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. In addition, 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 is 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] Plus 1x kitchen towel sheet, 1m between 2 plies 2 The water absorption per meter between two plies is preferably 100g to 300g. 2 If the water absorption per meter is less than 100g, the water absorption of the kitchen towel sheet 1x is inferior, and if it exceeds 300g, the paper thickness of the kitchen towel sheet 1x becomes thick and bulky, and the water absorption is not improved as much as the bulkiness. 2 The water absorption per meter is for 2 plies. 2 From the amount of water absorbed per m of one ply (surface 1a) described later, 2 Water absorption per m2 and 1 ply (back side 1b) 2 This is the value obtained by subtracting the amount of water absorbed per unit area. In addition, 1m between two plies 2 The water absorption per unit is more preferably 130 g or more and 280 g or less, and further preferably 160 g or more and 260 g or less. The water absorption per unit is measured as follows.

[0047] First, take 1x kitchen towel sheet that is layered in 2 plies and cut it using a square template with each piece being 7.6 cm (3 inches) to prepare a rectangular test piece with each side being 7.6 cm. The mass of the test piece before water absorption is measured using an electronic balance. The test piece is set in a holder (a jig that fixes three points of the test piece, the jig is made of a metal that does not absorb water). Next, distilled water is poured into a commercially available tub to a depth of 2 cm, and the test piece set in the holder is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece is taken out of the distilled water together with the holder, and a band 210 is attached to one corner 200d of the test piece 200 as shown in FIG. 7. The band 210 is made by cutting the same kitchen towel sheet 1x as the sample to be measured into a size of 2 mm wide x 15 mm long, peeling off the ply, and using one ply on the back side, attaching it to a part 6 mm from the corner 200d toward the center of the test piece 200. Next, the holder and the test piece 200 are hung on a rod installed in an empty water tank so that the corner 200a facing the corner 200d is on top, and the lid of the water tank 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 with an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, 2 Absorption of distilled water per sheet (g water / m 2 ) is calculated. 2 Water absorption per sheet (g water / m 2 ) by the basis weight of two plies of the test piece 200, 2 Water absorption per sheet (g water / m 2 ) / grammage(sheet g / sheet m 2 ) = Water absorption per gram (g water / g 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 overlapped with 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 ply. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and a 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 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 3.0 g or more, more preferably 3.5 g to 7.0 g or less, and even more preferably 4.0 g to 6.0 g or less. On the other hand, the water absorption per gram of one ply (back surface 1b) of the kitchen towel sheet 1x is preferably 3.1 g or more, more preferably 3.6 g to 7.1 g or less, and even more preferably 4.1 g to 6.1 g or less.

[0049] (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. By having the core outer diameter DI within the above range, the winding density of the kitchen towel roll 1 can be favorably maintained 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 to 22 g, more preferably 7 g to 17 g, and even more preferably 9 g to 13 g.

[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 one kitchen towel sheet is preferably 7 cm 3 If the absorbency is less than 22 cm / g, the absorbency is inferior to that of a single kitchen towel sheet. 3 If the specific volume exceeds 9 cm3 / g, the water absorption is not improved despite the bulkiness. 3 / g or more 20cm 3 / g or less is more preferable, and 3 / g or more 17cm 3 The specific volume is calculated by dividing the paper thickness per two plies of 1x 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 tensile strength in the machine direction when dry, DMDT (Dry Machine Direction Tensile Strength) of the two plies of the kitchen towel sheet 1x based on JIS P 8113, is preferably 4.5 N / 25 mm or more and 21 N / 25 mm or less, and the tensile strength in the cross direction when dry, DCDT (Dry Cross Direction Tensile Strength) is preferably 4.5 N / 25 mm or more and 21 N / 25 mm or less. If the DMDT or DCDT is less than 4.5 N / 25 mm, the kitchen towel sheet 1x having a high water absorption capacity as in the present application will tend to break when absorbing water, and if the DMDT or DCDT exceeds 21 N / 25 mm, the density of the kitchen towel sheet 1x will be high and the water absorbency will be poor. The DMDT is more preferably 6.0N / 25mm to 17.0N / 25mm, and even more preferably 7.5N / 25mm to 12.0N / 25mm, and the DCDT is more preferably 6.0N / 25mm to 17.0N / 25mm, and even more preferably 7.5N / 25mm to 12.0N / 25mm. Furthermore, 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) In addition, 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, the kitchen towel sheet 1x, which has a high water absorption capacity as in the present application, will tend to break when absorbing water, and if the WMDT or WCDT exceeds 8.0 N / 25 mm, the density of the kitchen towel sheet 1x will be high and the water absorbency will be poor. The WMDT is more preferably 2.0N / 25mm to 6.0N / 25mm, and even more preferably 2.5N / 25mm to 4.5N / 25mm, and the WCDT is more preferably 2.0N / 25mm to 6.0N / 25mm, and even more preferably 2.5N / 25mm to 4.5N / 25mm. 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 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 further preferably 0.15 N / 75 mm or more and 0.6 N / 75 mm or less. The method for measuring the ply peel strength is based on the tensile test method of JIS P 8113, and can use a tensile tester (STB-1225S, manufactured by A&D Co., Ltd.), and is performed under the standard conditions specified in JIS P 8111. First, a test piece of 75 mm in the width direction and 200 mm in the machine direction is taken from the kitchen towel roll 1 sample. Next, the ply is peeled off 35 mm in the machine direction. One side of the peeled ply is clamped and fixed by an upper grip (width 75 mm) in the machine direction by 15 mm. The other ply is also clamped and fixed by a lower grip (width 75 mm) in the machine direction by 15 mm. The pitch (spacing) of the grippers is 20 mm. Next, the sample is pulled (peeled off) at a pulling speed of 100 mm / min, and strength data is 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 determine 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 from 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 the kitchen towel roll 1 can be manufactured, for example, in the order of (1) papermaking and creping, (2) embossing, and (3) roll winding. In the manufacturing process, it is preferable to use a through-air dryer technique. In this case, in the papermaking process, a concave-convex pattern derived from the papermaking process (fabric) different from the above-mentioned embossing pattern is applied to the kitchen towel sheet 1x. By having this concave-convex pattern, the water absorption of the kitchen towel sheet 1x is further increased. Note that, "derived from the papermaking process" means that in the papermaking process of the kitchen towel sheet 1x, the concave-convex pattern is applied between the head box of the papermaking machine and the entrance of the Yankee dryer, and the concave-convex pattern is formed by drying the sheet together with the fabric in the through-air dryer section in particular. The uneven pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the uneven pattern changes the specific volume (paper thickness), but it is preferable to select a pattern that makes the specific volume (paper thickness) of the base paper fall within the numerical range described below. It is also preferable to select a pattern that makes the root mean square height Sq of the surface roughness of the non-embossed portion of the kitchen towel sheet 1x fall within the numerical range described above.

[0055] When using a base paper made using this through-air dryer, the area ratio of the convex parts 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 having good water absorption as in the present application. If the area ratio exceeds 40%, the paper of the kitchen towel sheet 1x is crushed and the water absorption capacity is poor. The area ratio of the convex portion is more preferably 6% to 30%, and even more preferably 9% to 18%. The shape of the convex portion and the embossed portion alone can be a circle, an ellipse, a rectangle, a square, a floral pattern, a logo, a letter, etc., without any particular limitation, but as described above, a linear embossment is preferable. As described above, the embossment is 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 kitchen towel sheet 1x (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 thickness of the paper 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, and 3 / g or more 20cm 3 / g or less is more preferable, and 3 / g or more 17cm 3 It is more preferable that the molecular weight is not more than 1 / g.

[0057] The ratio of the embossing depth in the embossing pattern to the thickness of the base paper of the kitchen towel sheet 1x, that is, 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 setting it within this range, in the case of the kitchen towel sheet 1x having good water absorption as in the present application, it is possible to improve water absorption by preventing ply peeling without bulkiness. 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 to prevent ply peeling without being bulky and to improve 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 -0.5 cm 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 within the spirit and scope of the present invention. EXAMPLES

[0059] Through the steps of (1) papermaking and creping, (2) embossing, and (3) rolling, the kitchen towel sheets and kitchen towel rolls of Examples 1 to 27 and Comparative Examples 1 to 12 were manufactured. In addition, one type of commercially available kitchen towel sheet and kitchen towel roll was prepared. The above-mentioned parameters were measured and evaluated for all of the above Examples, Comparative Examples, and commercially available kitchen towel rolls. Regarding the embossing pattern, the number and thickness were appropriately changed in each Example and Comparative Example, and all embossing was provided only on the front side of the kitchen towel sheet. Specifically, the number of embossing was increased in Comparative Examples 7 to 18, while the number of embossing was not increased in Examples 19 to 8, and the thickness of the embossing was increased. For products with a roll width other than 280 mm, including commercially available product 1, the roll mass is calculated per roll width of 280 mm 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 Exceeding 50g / m 2 Below: 4 points 46g / m 2 Below: 5 points

[0061] Water absorption: 1m of 2-ply sheets 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 performed as shown in Table 1 below. [Table 1]

[0063] Replacement frequency: The winding length was measured and evaluated as follows. Less than 10m: 1 point 10m to 14m: 2 points 14m to under 21m: 3 points 21m to less than 25m: 4 points 25m or more: 5 points

[0064] Wipeability (resistance to peeling of ply): 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

[0065] The results are shown in Tables 2 to 4. [Table 2]

[0066] [Table 3]

[0067] [Table 4]

[0068] 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]

[0069] 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 gluing a sheet having an embossed pattern thereon and laminating the sheet in two plies, the kitchen towel sheet being wound 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, 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 220g or more and 600g or less, 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 water absorption per gram of the two plies of the kitchen towel sheet is 6 g or more.

3. 1m between the two plies of the kitchen towel sheet ２ 3. The kitchen towel roll according to claim 1, wherein the water absorption per unit area 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 convex portions in 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 to 4 mm and the length of the embossing is 5 mm or more, and the total length of the embossing is 50 cm / 100 cm. ２ More than 550cm / 100cm ２ 10. The kitchen towel roll of claim 9, characterized in that:

11. 11. The kitchen towel roll according to claim 1, wherein the root mean square height of the surface roughness of the kitchen towel sheet in the portion not having the embossed pattern is 35 μm or more.

12. The kitchen towel roll according to any one of claims 1 to 11, characterized in that the kitchen towel sheet has no embossing on the back surface.

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