Kitchen towel roll

Abstract

To provide a kitchen towel roll having a certain range of basis weight, a compact roll, good replacement frequency of the roll, good water absorbency, and good tactile feeling peculiar to a through air dryer technology, and being hard to wrinkle while improving daily quantity.SOLUTION: A kitchen towel sheet according to the present invention is provided as a kitchen towel roll in which a sheet having at least 1 ply imparted with an embossed pattern is bonded with glue, and the kitchen towel sheet laminated on 2 plies is wound in a roll shape, the winding length of the kitchen towel roll is 18 m or longer and 40 m or shorter, the winding diameter is 120 mm or larger and 180 mm or smaller, the basis weight of 2 plies of the kitchen towel sheet is 47 g / m2 or more and 65 g / m2 or less, the water absorption of 2 plies of the kitchen towel sheet is 265 g or more and 440 g / m2 or less, 4.7 g / g or more and 8.0 g / g or less, and the DGMT of the kitchen towel sheet is 4.5 N / 25 mm or more and 21 N / 25 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 kitchen towel rolls have been developed, which are made by winding up kitchen towels into a roll. Kitchen towel rolls are often used for cleaning the kitchen and for draining and wiping dishes, and due to their uses, they are required to have sufficient water absorption and strength, so papermaking technologies have been developed to increase water absorption and oil absorption.

[0003] For example, Patent Document 1 discloses that by using through-air dryer technology in the towel sheet manufacturing process, an uneven pattern derived from the papermaking process (fabric) that differs from the embossed pattern in the papermaking and creping processes is applied to the kitchen towel, and that the kitchen towel has this uneven pattern, which improves the water absorption capacity of the kitchen towel.

[0004] However, when this through-air dryer technology is used, there are problems in terms of operation at manufacturing sites, such as the use of a lot of energy to dry the paper with hot air, and the slower papermaking speed, resulting in a decrease in daily production volume (t / day). Therefore, by reducing the size of the uneven pattern derived from the papermaking process, the drying efficiency improves, the papermaking speed can be increased, and daily production volume can be increased, but at the same time, the paper thickness (specific volume) of the kitchen towels decreases, resulting in a decrease in water absorbency.

[0005] Therefore, if the basis weight of the towel sheet is increased to improve water absorption, the towel sheet becomes thicker, and the roll length becomes shorter, which reduces the frequency of replacement and reduces compactness. In addition, the strength of the towel sheet increases due to the increased basis weight, which reduces the tactile feel that is unique to through-air dryer technology.

[0006] On the other hand, embossing generally increases the thickness of the paper, and as disclosed in Patent Document 2, in the case of a line-shaped embossed pattern that reduces the paper thickness, the embossed pattern is long and continuous, making the paper more prone to wrinkling. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2022-152428 A [Patent Document 2] Patent No. 6786387 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above problems, and has an object to provide a kitchen towel roll using through-air dryer technology, which has a basis weight within a certain range, is compact in size, requires a good frequency of roll replacement, has good water absorbency, has a good feel specific to through-air dryer technology, and is wrinkle-resistant while improving daily production volume. [Means for solving the problem]

[0009] The inventors of the present invention conducted extensive research to solve the above problems. As a result, they discovered that the above problems can be solved by adjusting the winding length and winding diameter of the kitchen towel roll, the basis weight, water absorption, and tensile strength of the kitchen towel sheet, the unevenness pattern different from the embossed pattern, and the root mean square height of the surface roughness in the area where the embossed pattern is not applied, and thus completed the present invention. Specifically, the present invention provides the following.

[0010] (1) The first aspect of the present invention is a kitchen towel roll, which is made by gluing at least one ply of a sheet having an embossed pattern, laminating the sheet into two plies, and winding the resulting kitchen towel sheet into a roll. The length of the kitchen towel roll is 18 m to 40 m, and the diameter of the roll is 120 mm to 180 mm. The basis weight of the two plies of the kitchen towel sheet is 47 g / m. 2 More than 65g / m 2 The water absorption of the two plies of the kitchen towel sheet is 1 m 2 The weight of the kitchen towel sheet is 265 g or more and 440 g or less per 1 g, and 4.7 g or more and 8.0 g or less per 1 g, and the tensile strength of the kitchen towel sheet in the machine direction when dry based on JIS-P8113 is DMDT and the tensile strength of the kitchen towel sheet in the cross direction when dry based on JIS-P8113 is DCDT, and the square root of the product of DMDT and DCDT is DGMT (= (DMDT × DCDT) 1 / 2 ) is 4.5 N / 25 mm or more and 21 N / 25 mm or less, the kitchen towel sheet has an uneven pattern derived from a papermaking process different from the embossed pattern, and the root mean square height of the surface roughness of the kitchen towel sheet in a portion not having the embossed pattern is 30 μm or more and 110 μm or less.

[0011] (2) A second aspect of the present invention is the kitchen towel roll according to (1), characterized in that the embossed pattern has a length of less than 50 mm.

[0012] (3) A third aspect of the present invention is the kitchen towel roll according to (1), characterized in that the paper thickness of the kitchen towel sheet is 2.3 mm or more / 10 sheets and 4.0 mm or less / 10 sheets.

[0013] (4) A fourth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the DMDT is 5 N / 25 mm or more and 22 N / 25 mm or less.

[0014] (5) A fifth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the DCDT is 4N / 25mm or more and 18N / 25mm or less.

[0015] (6) A sixth aspect of the present invention is the kitchen towel roll described in (1), characterized in that the value obtained by dividing the DGMT by the basis weight of the two plies (=DGMT / basis weight of two plies) is 0.08 or more and 0.35 or less.

[0016] (7) The seventh aspect of the present invention is the kitchen towel roll according to (1), wherein the specific volume of the kitchen towel sheet is 8.1 cm 3 / g or more 14.5cm 3 / g or less.

[0017] (8) The eighth aspect of the present invention is the kitchen towel roll according to (1), wherein the roll density of the kitchen towel roll is 0.072 g / cm 3 More than 0.116g / cm 3 It is characterized in that:

[0018] (9) The ninth aspect of the present invention is the kitchen towel roll according to (1), wherein the winding density of the kitchen towel roll is 0.25 m / cm 2 More than 0.42m / cm 2 It is characterized in that:

[0019] (10) A tenth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the embossing depth in the embossing pattern is 0.20 mm or more and 0.55 mm or less.

[0020] (11) The eleventh aspect of the present invention is the kitchen towel roll according to (1), wherein the embossing density in the embossing pattern is 30 embossments / cm 2 More than 700 pieces / cm 2 It is characterized in that: Effect of the Invention

[0021] According to the present invention, it is possible to provide a kitchen towel roll which uses through-air dryer technology, yet has a good daily production volume, a certain range of basis weight, a compact roll, good roll replacement frequency, good water absorbency, a good feel specific to through-air dryer technology, and is wrinkle-resistant. [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 at least one ply of a sheet having an embossed pattern, laminating the sheet into two plies, and winding the resulting sheet into a roll. It is preferable that the kitchen towel sheet 1x is perforated in the width direction at approximately equal intervals in the machine direction from the outermost roll edge 1e of the kitchen towel sheet 1x (not shown).

[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] (Volume length) The winding length of the kitchen towel roll 1 is 18 m or more and 40 m or less. If the winding length is less than 18 m, the kitchen towel roll 1 will need to be replaced more frequently, and if it exceeds 40 m, the winding diameter of the kitchen towel roll 1 will be large and it will be less compact. The lower limit of the winding length is preferably 20 m or more, and more preferably 22 m or more. The upper limit of the winding length is preferably 34 m or less, and more preferably 30 m or less.

[0027] The roll length is determined by measuring the length of 10 sheets of kitchen towel sheets 1x between the perforations of kitchen towel roll 1. 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 there are 150 sheets, then 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 actually measuring it.

[0028] (Roll diameter) The roll diameter DR of the kitchen towel roll 1 is 120 mm or more and 180 mm or less. If the roll diameter DR is less than 120 mm, the roll length of the kitchen towel sheet 1x becomes short, and the kitchen towel roll 1 needs to be replaced more frequently, while if it exceeds 180 mm, the kitchen towel roll 1 is less compact. The lower limit of the roll diameter DR is preferably 135 mm or more, and more preferably 139 mm or more. The upper limit of the roll diameter DR is preferably 162 mm or less, and more preferably 152 mm or less.

[0029] The roll diameter DR of the roll is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Four kitchen towel rolls 1 are measured, and the measurement results are averaged.

[0030] (Length between perforations) The lower limit of the length between the perforations (length of the sheet in the machine direction) is preferably 100 mm or more, more preferably 125 mm or more, and even more preferably 150 mm or more. The upper limit of the length between the perforations is preferably 270 mm or less, more preferably 240 mm or less, and even more preferably 210 mm or less. 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 is appropriate, and it is not necessary to use more kitchen towel sheets than necessary, resulting in a good replacement frequency.

[0031] (Roll width) The lower limit of the roll width of the kitchen towel roll 1 is preferably 180 mm or more, more preferably 220 mm or more, and even more preferably 250 mm or more. The upper limit of the roll width is preferably 340 mm or less, more preferably 320 mm or less, and even more preferably 300 mm or less. If the roll width is less than 180 mm, the water absorbency of the kitchen towel sheet 1x is poor, and if it exceeds 340 mm, the compactness of the kitchen towel roll 1 is poor.

[0032] (Roll weight) The lower limit of the roll mass of the kitchen towel roll 1 is preferably 250g or more, more preferably 300g or more, and even more preferably 350g or more. The upper limit of the roll mass is preferably 650g or less, more preferably 550g or less, and even more preferably 450g or less. If the roll mass is less than 250g, the kitchen towel roll 1 will need to be replaced more frequently, and if it exceeds 650g, the roll diameter of the kitchen towel roll 1 will be large and compactness will be poor. The roll mass is the mass per 280mm of roll width, not including the core (paper tube). If the roll width is not 280mm, it is converted to the mass per 280mm by proportional calculation.

[0033] (Roll density) The roll density of kitchen towel roll 1 is 0.072 g / cm 3 More than 0.116g / cm 3 The roll density is preferably 0.072 g / cm 3 If it is less than 0.116 g / cm, the compactness of the kitchen towel roll 1 will be poor. 3 If the density exceeds 0.082 g / cm, the water absorbency of the kitchen towel sheet 1x will be poor. 3 More preferably, 0.090 g / cm 3 The upper limit of the roll density is preferably 0.110 g / cm. 3 Less than 0.103 g / cm is more preferable. 3 The following is even more preferred:

[0034] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of kitchen towel roll 1 per 280 mm of roll width. Roll volume is expressed as [{cross-sectional area of ​​roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​core (paper tube) outer diameter DI)] × roll width (converted per 280 mm). For example, if the roll mass (excluding core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the core outer diameter DI is 39 mm, roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(280mm÷10)]=0.083g / cm 3 In addition, if kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI.

[0035] (winding density) The winding density of kitchen towel roll 1 is 0.25m / cm 2 More than 0.42m / cm 2 The winding density is preferably 0.25 m / cm 2 If it is less than 0.42 m / cm, the compactness of the kitchen towel roll 1 will be poor. 2 If the density exceeds 0.29 m / cm, the water absorbency of the kitchen towel sheet 1x will be poor. 2 More preferably, 0.32 m / cm or more 2 The upper limit of the winding density is 0.39 m / cm 2 Less than 0.36m / cm is more preferable. 2 The following is even more preferred:

[0036] The winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll's outer diameter (winding diameter DR) part - (cross-sectional area of ​​the core (paper tube) outer diameter DI part)}. The core outer diameter DI is the diameter of the central 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, the 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.

[0037] (grammage of 2 ply) The basis weight of 2 plies of 1x kitchen towel sheet is 47g / m 2 More than 65g / m 2 The basis weight of the two plies is 47 g / m 2 If it is less than 65g / m, the water absorption capacity of one kitchen towel sheet will be poor. 2If the value exceeds this value, the compactness of the kitchen towel roll 1 will be poor, and the texture of the kitchen towel sheet 1x, which is unique to the through-air dryer technology, will be poor. The lower limit of the basis weight of the two plies of the kitchen towel sheet 1x is 51 g / m 2 More than 55g / m is preferable. 2 More preferably, the upper limit of the basis weight of the two plies is 62 g / m 2 Less than 59 g / m is preferred 2 The following is more preferred: Basis weight is measured based on JIS P 8124.

[0038] (paper thickness) The paper thickness of the kitchen towel sheet 1x is preferably 2.3 mm / 10 sheets or more and 4.0 mm / 10 sheets or less. If the paper thickness is less than 2.3 mm / 10 sheets, the water absorption capacity of the kitchen towel sheet 1x will be poor, and if the paper thickness is more than 4.0 mm / 10 sheets, the compactness of the kitchen towel roll 1 will be poor. The lower limit of the paper thickness of the kitchen towel sheet 1x is more preferably 2.5 mm / 10 sheets or more, and even more preferably 2.7 mm / 10 sheets or more. The upper limit of the paper thickness is more preferably 3.6 mm / 10 sheets or less, and even more preferably 3.3 mm / 10 sheets or less.

[0039] The paper thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a gauge diameter of 30 mm. The sample is placed between the gauge and the measurement table, and the gauge is read when the gauge 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 measure 10 sheets. The measurement is also repeated 10 times at different points and the results are averaged.

[0040] (embossed pattern) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention has an embossed pattern in at least one ply. The kitchen towel sheet 1x of the present invention is laminated into two plies after embossing the sheet. When laminating the two plies, a ply bond glue is used and applied to bond them. By bonding them into two plies in this way, the adhesion of the plies becomes strong, and even if the kitchen towel sheet 1x gets wet during wiping, the plies do not peel off and the water absorption becomes good.

[0041] There are no particular limitations on the embossing, and pin-to-pin, nested, or front-only embossing may be used. Since the present application has a higher basis weight than general kitchen tarpaulin sheets, it is preferable to provide nested or front-only embossing so that the paper thickness does not become too thick due to embossing.

[0042] 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 portion of the embossed pattern 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 such as a line, circle, ellipse, triangle, square, logo, etc. that is generally applied to kitchen towels, but it is preferable that it is a dot pattern (circle, etc.) with a diameter of about 2 to 10 mm. Specifically, as shown in FIG. 2, the approximately round dots are arranged approximately line symmetrically in the vertical and horizontal directions as a whole, which provides a good tactile feel. In addition, the ply is less likely to peel off and has good water absorption.

[0043] (embossing length) The length of the embossing in the embossing pattern is preferably less than 50 mm. If the embossing includes embossings with a length of 50 mm or more, it becomes difficult to provide a long, continuous pattern in the kitchen towel sheet, which has a high basis weight and paper thickness, and wrinkles are likely to occur in the kitchen towel roll 1. The length of the embossing is measured by measuring the length of the recessed portion of the sheet using a microscope.

[0044] (embossing depth) The embossing depth in the embossing pattern is preferably 0.20 mm or more and 0.55 mm or less. If the embossing depth is less than 0.20 mm, the touch feeling and water absorbency are poor. The surface layer of the kitchen towel sheet 1x is easily torn, and if it exceeds 0.55 mm, the kitchen towel sheet 1x is easily wrinkled. The lower limit of the embossing depth in the embossing pattern is more preferably 0.25 mm or more, and even more preferably 0.30 mm or more. The upper limit of the embossing depth is more preferably 0.50 mm or less, and even more preferably 0.45 mm or less.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 W (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). If the embossing pattern is large and it is difficult to measure at two consecutive locations, it is acceptable to measure one location (depression D1 between convex parts H1 and H2) and another location (depression D2 between convex parts H3 and H4). After that, kitchen towel roll 1 is rotated 90 degrees three times in the flow direction of kitchen towel sheet 1x, and measurements are taken in the same manner as above at each position (a total of four measurement positions in the flow direction), and the average value of the total of eight locations (2 x 4) is finally adopted as the embossing depth.

[0049] 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, measurements are performed at a location that avoids that part.

[0050] 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 embossing or no embossing is preferable, and no embossing is more preferable. 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, the paper may be crushed by providing embossing, which may reduce the water absorption. For this reason, it is preferable that the front surface 1a is dot embossed so that the embossed area ratio is constant, and the back surface 1b is not embossed.

[0051] (embossed area ratio) The lower limit of the embossed area ratio is preferably 3% or more, more preferably 8% or more, and even more preferably 13% or more. The upper limit is preferably 35% or less, more preferably 30% or less, and even more preferably 25% or less. The area ratio of the embossed portion of the embossing roll for embossing the kitchen towel sheet is regarded as the embossed area ratio. The embossed area ratio is the area ratio of the embossed portion on the roll surface side.

[0052] The ply on the surface 1a of the kitchen towel sheet 1x is provided with a dot-shaped embossed pattern. By providing the dot-shaped embossed pattern on the surface 1a, the embossed portions of the embossed pattern can be applied with glue for adhesion treatment, which makes it difficult for the ply of the kitchen towel sheet 1x to peel off and allows the water absorption to be within a certain range.

[0053] (embossing density) In the embossing pattern, the length of the embossment is less than 50 mm. The unit area of ​​the embossment is 100 cm 2 The number of embossed areas is preferably 30 to 700 per unit area of ​​100 cm. 2 If the number of pieces per unit area is less than 30, the adhesiveness of the plies will be poor because a base paper with a high basis weight will be used, leading to easy peeling of the plies and a poor texture characteristic of the through air dryer technology of the kitchen towel sheet 1x. 2 If the number of pieces per unit exceeds 700, the embossing must be finer, and the tactile feel characteristic of the through-air dryer technology of the kitchen towel sheet 1x is inferior. Note that the unit area of ​​the embossing of 100 cm2 where the length of the embossing is less than 50 mm 2 The lower limit of the number of embossments per unit area is more preferably 80 or more, and even more preferably 150 or more. The upper limit is more preferably 500 or less, and even more preferably 300 or less. The shape of the embossment itself can be any shape, including a circle, an ellipse, a rectangle, a square, a floral pattern, and the like, without any particular limitation.

[0054] (embossing size) In the embossing pattern, the minimum size (area) of each embossment is 1 mm 2 More than 10mm is preferable. 2 More preferably, 30 mm or more 2 More preferably, the upper limit of the size of each embossment is 400 mm. 2 Less than 250mm is preferable 2 Less than 100mm is preferable. 2 More preferably, the size of each embossment is 1 mm or less. 2 If the thickness is less than 400 mm, when a high-weight kitchen towel sheet 1x is used as in the present application, the plies do not adhere properly, causing peeling of the plies and resulting in poor water absorbency. 2 Above this, the feel of 1x kitchen towel sheet will be inferior.

[0055] The size of each embossment 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 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 12x and a field of view area of ​​24mm x 18mm. The measurement magnification and field of view area may be changed as appropriate depending on the desired size of the embossment.

[0056] 5, the depth of the embossment (e.g., 0.5 mm) is determined from the vertical measurement values ​​of convex portion H1, convex portion H2, and concave portion D1 between convex portions H1 and H2. Next, a horizontal line is drawn from concave portion D1 in the vertical (perpendicular) direction at a position half the value of the emboss depth (e.g., 0.5÷2=0.25 mm), and the size of the embossment is determined from the plan view by drawing a point where the horizontal line intersects with the cross-sectional curve.

[0057] (Root mean square height of surface roughness) The surface roughness root mean square height Sq 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 30 μm or more and 110 μm or less. If the surface roughness root mean square height Sq is less than 30 μm, the water absorption of the kitchen towel sheet 1x is poor, and if it exceeds 110 μm, the paper thickness of the kitchen towel sheet 1x increases, and the compactness of the kitchen towel roll 1 is poor. The lower limit of the surface roughness root mean square height Sq is preferably 40 μm or more, more preferably 50 μm or more. The upper limit of the surface roughness root mean square height Sq is preferably 95 μm or less, more preferably 60 μm or less.

[0058] 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.

[0059] 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.

[0060] 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 kitchen towel roll 1, 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 position (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.

[0061] (Water absorption (per unit area)) 1x kitchen towel sheet, 2 ply, 1m 2 The water absorption capacity per unit is 265g to 440g. 2If the water absorption per unit area is less than 265 g, the water absorption of the kitchen towel sheet 1x is poor, and if it exceeds 440 g, the basis weight of the kitchen towel sheet 1x becomes too high and the compactness of the kitchen towel roll 1 becomes poor. 2 The lower limit of the water absorption per m is preferably 300 g or more, and more preferably 330 g or more. 2 The upper limit of the amount of water absorption per unit weight is preferably 410 g or less, and more preferably 380 g or less.

[0062] (Water absorption (per unit weight)) The water absorption per gram of the two plies of the kitchen towel sheet 1x is 4.7 g or more and 8.0 g or less. If the water absorption per gram is less than 4.7 g, the water absorption of the kitchen towel sheet 1x is poor, and if it exceeds 8.0 g, the basis weight of the kitchen towel sheet 1x is high and the compactness of the kitchen towel roll 1 is poor. The lower limit of the water absorption per gram is preferably 5.3 g or more, and more preferably 5.8 g or more. The upper limit of the water absorption per gram is preferably 7.4 g or less, and more preferably 6.9 g or less.

[0063] The water absorption amount is measured by taking a kitchen towel sheet 1x that is two-ply stacked, cutting it using a square template with each piece being 7.6 cm (3 inches) to prepare a rectangular test piece 200 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 200 is set in a holder 220 (a jig that fixes three points of the test piece 200, and the jig is made of a metal that does not absorb water). Next, distilled water is placed in a commercially available tub to a depth of 2 cm, and the test piece 200 set in the holder 220 is immersed in the distilled water for two minutes. After the two-minute immersion, the test piece 200 is taken out of the distilled water together with the holder 220, and a band 210 is attached to one corner 200d of the test piece 200 as shown in FIG. 7. The strip 210 is made by cutting the same kitchen towel sheet 1x as the sample to a size of 2 mm wide x 15 mm long, peeling off the plies, and using one ply of the back surface 1b, attaching it to a portion of the test piece 200 6 mm from the corner 200d toward the center. Next, the holder 220 and the test piece 200 are hung from a rod installed in an empty water tank with the corner 200a opposite the corner 200d facing up, 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 strip 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, the 1 m 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.

[0064] 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.

[0065] (Core (paper tube) outer diameter) The lower limit of the core (paper tube) outer diameter DI, which is the outer diameter of the core (paper tube) of the kitchen towel roll 1, is preferably 32 mm or more, more preferably 36 mm or more, and even more preferably 40 mm or more. The upper limit of the core (paper tube) outer diameter DI is preferably 57 mm or less, more preferably 52 mm or less, and even more preferably 48 mm or less. By having the core outer diameter DI within the above range, the kitchen towel roll 1 is not bulky while maintaining a suitable winding density, so the compactness of the kitchen towel roll 1 is good, the winding length can be secured, and the roll can be replaced frequently.

[0066] The core outer diameter DI was measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Four kitchen towel rolls 1 were measured, and the measurement results were averaged.

[0067] (Mass of core (paper tube)) The lower limit of the mass of the core (paper tube) per 280 mm of roll width is preferably 7 g or more, more preferably 10 g or more, and even more preferably 13 g or more. The upper limit of the mass of the core (paper tube) is preferably 25 g or less, more preferably 22 g or less, and even more preferably 19 g or less. If the mass of the core (paper tube) is less than 7 g, the strength of the core is weak, and the kitchen towel sheet 1x with a high basis weight as in the present application is easily wrinkled when wound up, and if the mass of the core (paper tube) is more than 25 g, the strength of the core is too high, and when cutting to form a roll, cutting is difficult and wrinkles are easily generated in the cut part.

[0068] (specific volume) The specific volume of one kitchen towel sheet is 8.1 cm 3 / g or more 14.5cm 3 / g or less. The specific volume of one kitchen towel sheet is preferably 8.1 cm 3 If the absorbency is less than 14.5 cm / g, the absorbency of one kitchen towel sheet is poor. 3 If the specific volume of the kitchen towel roll 1 exceeds 9.1 cm3 / g, the compactness of the kitchen towel roll 1 will be poor. 3 / g or more is more preferable, and 9.8 cm 3 / g or more is more preferable. The upper limit of the specific volume is 13.0 cm 3 / g or less is more preferable, and 12.0 cm 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:

[0069] (DMDT) 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 5N / 25mm or more and 22N / 25mm or less. If the DMDT is less than 5N / 25mm, the kitchen towel sheet 1x is more likely to wrinkle, and if it exceeds 22N / 25mm, the tactile feel of the kitchen towel sheet 1x that is unique to the through air dryer technology is inferior. The lower limit of the DMDT is more preferably 8N / 25mm or more, and more preferably 10N / 25mm or more. The upper limit of the DMDT is more preferably 18 / 25mm or less, and more preferably 14N / 25mm or less.

[0070] (DCDT) The dry cross direction tensile strength (DCDT) of the two plies of the kitchen towel sheet 1x based on JIS P 8113 is preferably 4N / 25mm or more and 18N / 25mm or less. If the DCDT is less than 4N / 25mm, the kitchen towel sheet 1x is prone to wrinkles, and if it exceeds 18N / 25mm, the tactile feel of the kitchen towel sheet 1x that is unique to the through air dryer technology is poor. The lower limit of the DCDT is more preferably 6N / 25mm or more, and more preferably 8N / 25mm or more. The upper limit of the DCDT is more preferably 15N / 25mm or less, and more preferably 12N / 25mm or less.

[0071] (DGMT) Square root of the product of the above DMDT and DCDT (DMDT × DCDT) 1 / 2When the dry geometric tensile strength (DGMT) is defined as DGMT, the DGMT is 4.5N / 25mm or more and 21N / 25mm or less. If the DGMT is less than 4.5N / 25mm, the kitchen towel sheet 1x is more likely to wrinkle, and if it exceeds 21N / 25mm, the tactile feel of the kitchen towel sheet 1x, which is specific to the through air dryer technology, is inferior. The lower limit of the DGMT is preferably 7N / 25mm or more, and more preferably 9N / 25mm or more. The upper limit of the DGMT is preferably 17N / 25mm or less, and more preferably 13N / 25mm or less.

[0072] (DGMT / 2-ply basis weight) The value obtained by dividing the DGMT by the basis weight of the two plies of the kitchen towel sheet 1x is preferably 0.08 or more and 0.35 or less. If this value is less than 0.08, the kitchen towel sheet 1x is more likely to wrinkle, and if it exceeds 0.35, the tactile feel of the kitchen towel sheet 1x that is specific to the through-air dryer technology is poor. The lower limit of this value is more preferably 0.13 or more, and even more preferably 0.15 or more. The upper limit of this value is more preferably 0.30 or less, and even more preferably 0.25 or less.

[0073] <Method of manufacturing kitchen towel sheet and kitchen towel roll> The kitchen towel sheet 1x and the kitchen towel roll 1 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing, and (3) roll winding.

[0074] In the manufacturing process, a through-air dryer technique is used. At this time, in the papermaking process, a concave-convex pattern derived from the papermaking process (fabric) different from the above-mentioned embossed 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 outlet of the through-air dryer, and in particular, the sheet is dried together with the fabric in the through-air dryer section, thereby forming the concave-convex pattern.

[0075] 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.

[0076] 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

[0077] Through the steps of (1) papermaking and creping, (2) embossing, and (3) rolling, kitchen towel sheets and kitchen towel rolls of Examples 1 to 19 and Comparative Examples 1 to 11 were manufactured. The above-mentioned parameters were measured and evaluated for all the kitchen towel rolls of the above Examples and Comparative Examples. Note that the number and thickness of embossing patterns were appropriately changed in each Example and Comparative Example, and all embossing was provided only on the front side of the kitchen towel sheets.

[0078] The kitchen towel sheets and kitchen towel rolls produced under the conditions shown in Tables 1 to 3 were evaluated for the following items.

[0079] (Daily paper production) The daily paper production volume (t / day) was evaluated on a four-point scale based on the following: 4: The daily production volume was equal to or greater than that of a papermaking method using a general Yankee dryer, which was favorable. 3: The daily production volume was equivalent to that achieved by a papermaking method using a conventional Yankee dryer. 2: The daily production volume was slightly lower than that of a papermaking method using a general Yankee dryer, but there were no particular problems. 1: The daily production volume was inferior to that of a papermaking method using a general Yankee dryer.

[0080] (Water absorption) Thirty test subjects evaluated the absorbency of the kitchen towel sheets. The test subjects rated the absorbency of the kitchen towel sheets on a four-point scale based on the number of test subjects who rated the absorbency of water remaining on the sheets as good when using one set (2 ply). 4: More than 29 monitors rated the kitchen towel sheet as having good absorbency. 3: The number of monitors who rated the kitchen towel sheet as having good absorbency was between 27 and 28. 2: The number of monitors who rated the kitchen towel sheet as having good absorbency was 24 to 26 people. 1: Fewer than 23 monitors rated the kitchen towel sheet as having good absorbency.

[0081] (Roll compactness) Thirty test subjects evaluated the compactness of the kitchen towel roll. The test subjects rated the compactness of the kitchen towel roll on a four-point scale based on the number of test subjects who evaluated the compactness as good when carrying it around. 4: More than 29 monitors rated the compactness of the kitchen towel roll as good. 3: The number of monitors who rated the compactness of the kitchen towel roll as good was 27 to 28 people. 2: The number of monitors who evaluated the compactness of the kitchen towel roll as good was 24 to 26 people. 1: Fewer than 23 monitors rated the compactness of the kitchen towel roll as good.

[0082] (Replacement frequency) Thirty test subjects evaluated the frequency of replacing kitchen towel rolls. The test subjects rated how long it took to use up one roll of kitchen towel roll, and rated it on a four-point scale based on the number of test subjects who rated this period as long and the replacement frequency as good. 4: More than 29 monitors rated the frequency of changing kitchen towel rolls as good. 3: The number of monitors who rated the frequency of changing kitchen towel rolls as good was 27 to 28. 2: The number of monitors who rated the frequency of changing kitchen towel rolls as good was between 24 and 26. 1: Fewer than 23 monitors rated the frequency of changing kitchen towel rolls as good.

[0083] (Wrinkle resistance) Thirty test subjects evaluated the wrinkle resistance of kitchen towel rolls. The test subjects rated the kitchen towel rolls on a four-point scale based on the number of test subjects who rated the wrinkle resistance of the rolls as good when they used them. 4: More than 29 monitors rated the kitchen towel roll as being wrinkle-resistant. 3: The number of monitors who rated the kitchen towel roll's wrinkle resistance as good was between 27 and 28. 2: The number of monitors who rated the kitchen towel roll's wrinkle resistance as good was between 24 and 26. 1: Fewer than 23 testers rated the kitchen towel roll's wrinkle resistance as good.

[0084] (Tactile sensation) Thirty testers evaluated the texture of the kitchen towel sheet. The number of testers who rated the texture of the kitchen towel sheet as good was used to rank it on a four-point scale. 4: More than 29 monitors rated the smoothness of the kitchen towel sheet as good. 3: The number of monitors who rated the smoothness of the kitchen towel sheet as good was 27 to 28 people. 2: The number of monitors who rated the smoothness of the kitchen towel sheet as good was 24 to 26 people. 1: Fewer than 23 testers rated the smoothness of the kitchen towel sheet as good.

[0085] The results obtained are shown in Tables 1 to 3. [Table 1]

[0086] [Table 2]

[0087] [Table 3]

[0088] From the above, it can be seen that the kitchen towel roll of the present invention is a kitchen towel that uses through-air dryer technology, and while achieving good daily production volume, the roll has a compact basis weight within a certain range, allows for good frequency of roll replacement, has good water absorbency, has a good feel unique to through-air dryer technology, and is less likely to wrinkle. [Explanation of symbols]

[0089] 1 kitchen towel roll 1a surface 1b back side 1e The outermost edge of the kitchen towel sheet 1x kitchen towel sheet 200 test pieces 200a, 200d corner 210 Obi 220 Holder

Claims

1. A kitchen towel roll is a kitchen towel sheet formed by laminating two plies of a sheet having an embossed pattern on at least one ply with a glue, and winding the resulting sheet into a roll. The kitchen towel roll has a roll length of 18 m or more and 40 m or less, and a roll diameter of 120 mm or more and 180 mm or less, The basis weight of the two plies of the kitchen towel sheet is 47 g / m ２ 65g / m or more ２ is as follows: The water absorption capacity of the two plies of the kitchen towel sheet is 1 m ２ 265g to 440g per gram, and 4.7g to 8.0g per gram. When the tensile strength of the kitchen towel sheet in the machine direction when dry based on JIS-P8113 is DMDT and the tensile strength of the kitchen towel sheet in the cross direction when dry is DCDT, the square root of the product of the DMDT and the DCDT is DGMT (= (DMDT × DCDT) １／２ ) is 4.5N / 25mm or more and 21N / 25mm or less, The kitchen towel sheet has a pattern of protrusions and recesses derived from a papermaking process that is different from the embossed pattern, The kitchen towel sheet has a surface roughness root mean square height of 30 μm or more and 110 μm or less in a portion where the embossed pattern is not provided. A kitchen towel roll comprising:

2. 2. The kitchen towel roll of claim 1, wherein the embossed pattern is less than 50 mm in length.

3. 2. The kitchen towel roll according to claim 1, wherein the paper thickness of the kitchen towel sheet is 2.3 mm / 10 sheets or more and 4.0 mm / 10 sheets or less.

4. 2. The kitchen towel roll of claim 1, wherein the DMDT is 5 N / 25 mm or more and 22 N / 25 mm or less.

5. 2. The kitchen towel roll of claim 1, wherein the DCDT is 4 N / 25 mm or more and 18 N / 25 mm or less.

6. 2. The kitchen towel roll according to claim 1, wherein a value obtained by dividing the DGMT by the basis weight of the two plies (=DGMT / basis weight of two plies) is 0.08 or more and 0.35 or less.

7. The specific volume of the kitchen towel sheet is 8.1 cm ３ / g or more 14.5cm ３ 2. The kitchen towel roll of claim 1, wherein the elastic modulus is 0.1 to 1.0 g / g or less.

8. The roll density of a kitchen towel roll is 0.072 g / cm ３ 0.116g / cm or more ３ 2. The kitchen towel roll of claim 1, characterized in that:

9. The winding density of the kitchen towel roll is 0.25 m / cm ２ More than 0.42 m / cm ２ 2. The kitchen towel roll of claim 1, characterized in that:

10. 2. The kitchen towel roll of claim 1, wherein the embossing depth in the embossing pattern is 0.20 mm or more and 0.55 mm or less.

11. The density of the embossing in the embossing pattern is 30 embossings / cm ２ More than 700 pieces / cm ２ 2. The kitchen towel roll of claim 1, characterized in that:

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