Kitchen tissue roll paper

Abstract

Provided is a kitchen tissue roll which is kept within a certain range without having too high gram weight, and which is soft and firm in touch while maintaining strength and water absorption. The present invention provides a roll paper for kitchen tissues, which is characterized in that: the roll paper for kitchen tissues is obtained by adhering a sheet, in which an embossed pattern is applied to one or both of two layers, using glue or water, and winding the laminated sheet for kitchen tissues into a roll paper shape; the kitchenware tissue sheet is characterized in that the basis weight of one layer is 16 g / m2 or more and 27 g / m2 or less, both the DMDT and the DCDT are 600 gf / 25 mm or more and 1500 gf / 25 mm or less, the ratio DMDT / DCDT of the DMDT to the DCDT is 0.3 or more and 2.5 or less, both the bending resistance in the MD direction and the bending resistance in the CD direction are 4.5 mN or more and 22.0 mN or less, and the water absorption per unit area is 330 g / m2 or more and 600 g / m2 or less.

Description

Technical Field

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

[0002] In recent years, various kitchen paper towels have been developed.

[0003] The strength of kitchen paper towels and the firm feeling during use are important. In ordinary base paper, in order to exhibit a firm feeling, papermaking techniques for improving the strength of the base paper have been developed.

[0004] The base paper obtained by using the so-called TAD (Through Air Drying) papermaking technique with air permeable drying has high water absorbency and a soft hand feeling, and thus is excellent as the base paper for a kitchen paper towel roll.

[0005] As a prior art document of a kitchen paper towel roll, for example, Patent Document 1 discloses a kitchen paper towel roll 1, which is characterized in that the kitchen paper towel roll 1 is obtained by bonding a sheet material provided with an embossed pattern using glue and winding a two-layer kitchen paper towel sheet 1x into a roll shape. The kitchen paper towel sheet has uneven patterns derived from a papermaking process different from the embossed pattern. The grammage of the two layers is 30 g / m 2 above and 54 g / m 2 below. The paper thickness is 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less. The water absorption per 1 m 2 of the two layers is 220 g or more and 600 g or less. The roll length of the kitchen paper towel roll 1 is 14 m or more and 44 m or less, and the roll diameter is 110 mm or more and 189 mm or less.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-116768 Summary of the Invention

[0009] Problems to be Solved by the Invention

[0010] For kitchen paper towel rolls, not only water absorbency and a soft hand feeling are required, but also a firm feeling (elasticity and stiffness of the paper) when wiping an object to be wiped and the paper not breaking. However, in the case of TAD, since a concavo-convex fabric is used to increase the paper thickness, rather than a firm feeling, a soft hand feeling is obtained. In addition, since the fibers binding between the fibers are fewer than those of a papermaking machine using a conventional dry wrinkling method, the strength becomes lower.

[0011] Therefore, if conventional embossing (e.g., patterns such as quadrilaterals, circles, and ellipses as conventional embossed patterns) is used, the strength will be reduced (not maintained) this time. To address this problem, by increasing the basis weight, the strength and water absorption can be maintained at a relatively high level, but in this case, the cost will increase.

[0012] The present invention has been completed in view of such circumstances, and an object thereof is to provide a roll of kitchen paper towels that does not have an excessive basis weight but is maintained within a certain range, and while maintaining strength and water absorption, has a soft touch and also has a sense of firmness.

[0013] Means for Solving the Problem

[0014] The inventors conducted in-depth research and found that in a roll of kitchen paper towels obtained by bonding a sheet having an embossed pattern applied to one or both of two sheets with glue or water and winding the two-layer laminated kitchen paper sheets into a roll shape, by setting the basis weight of one layer of the kitchen paper sheets, the respective tensile strengths in the MD direction and the CD direction during drying and their ratios, the bending resistance in the MD direction and the CD direction, and the water absorption per unit area within specified numerical ranges, a roll of kitchen paper towels can be produced that does not have an excessive basis weight but is maintained within a certain range, maintains strength and water absorption, has a soft touch, and also has a sense of firmness, thus completing the present invention. That is, the present invention provides the following solutions.

[0015] (1) A first aspect of the present invention is a roll of kitchen paper towels, characterized in that the roll of kitchen paper towels is obtained by bonding a sheet having an embossed pattern applied to one or both of two sheets with glue or water and winding the two-layer laminated kitchen paper sheets into a roll shape, and the basis weight of one layer of the kitchen paper sheets is 16 g / m 2 or more and 27 g / m 2 or less, the tensile strength DMDT in the MD direction during drying and the tensile strength DCDT in the CD direction during drying of the kitchen paper sheets, both based on JIS P 8113, are 600 gf / 25 mm or more and 1500 gf / 25 mm or less, and the ratio (DMDT / DCDT) of the DMDT to the DCDT is 0.3 or more and 2.5 or less, the bending resistance in both the MD direction and the CD direction of the kitchen paper sheets is 4.5 mN or more and 22.0 mN or less, and the water absorption per unit area of the kitchen paper sheets is 330 g / m 2 or more and 600 g / m 2 or less.

[0016] (2) The second aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the specific volume of the kitchen paper towel sheet is 7.6 cm 3 / g or more and 19.2 cm 3 / g or less.

[0017] (3) The third aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the embossed pattern is linear, and in the linear embossed pattern, the area occupied by the embossing with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more is 4% or more and 50% or less of the area of the kitchen paper towel sheet.

[0018] (4) The fourth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the depth of the embossing in the embossed pattern is 0.06 mm or more and 1.05 mm or less.

[0019] (5) The fifth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the kitchen paper towel sheet has an uneven pattern from a papermaking process different from the embossed pattern.

[0020] (6) The sixth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the paper thickness of the kitchen paper towel sheet is 1.3 mm / 10 layers or more and 5.0 mm / 10 layers or less.

[0021] (7) The seventh aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the roll diameter of the roll paper is 110 mm or more and 189 mm or less.

[0022] (8) The eighth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the elongation rate of the kitchen paper towel sheet in the MD direction based on JIS P 8113 is 6% or more and 15% or less.

[0023] (9) The ninth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the elongation rate of the kitchen paper towel sheet in the CD direction based on JIS P 8113 is 3% or more and 10% or less.

[0024] (10) The tenth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the roll softness of the roll paper is 1.2 mm or more and 4.0 mm or less.

[0025] (11) The eleventh aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the peel strength of the kitchen paper towel sheet is 0.03 N / 100 mm or more and 0.5 N / 100 mm or less.

[0026] (12) The twelfth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the root mean square height of the surface roughness of the portion of the kitchen paper towel sheet where the embossed pattern is not imparted is 35 μm or more and 170 μm or less.

[0027] (13) The thirteenth aspect of the present invention is the kitchen paper towel roll according to (1), characterized in that the kitchen paper towel sheet is wound around a paper tube, and in the base paper used in the paper tube, the weight content rate of LBKP (bleached hardwood kraft pulp) is 50% or more and 100% or less.

[0028] Advantages of the Invention

[0029] According to the present invention, it is possible to provide a kitchen paper towel roll that does not have an excessive grammage and is kept within a certain range, and has a soft touch while maintaining strength and water absorption, and also has a firm feeling. Description of the Drawings

[0030] Figure 1 is a perspective view of a kitchen paper towel roll according to an embodiment of the present invention.

[0031] Figure 2 is a diagram showing a method for measuring the water absorption of the kitchen paper towel sheet of the present invention.

[0032] Figure 3 is a diagram showing an example of the embossed pattern in the kitchen paper towel roll of the present invention.

[0033] Figure 4 is a diagram showing the height distribution on the X-Y plane based on a microscope in shades.

[0034] Figure 5 is a diagram showing the height distribution on the X-Y plane based on a microscope in a curve graph.

[0035] Figure 6 is a diagram showing a method for obtaining the embossing depth of the embossed pattern.

[0036] Figure 7 is a diagram showing a part of the papermaking process of the kitchen paper towel sheet of the present invention.

[0037] Figure 8 is a diagram showing the height distribution on the X-Y plane based on a microscope of the non-embossed part in shades.

[0038] Figure 9 is Figure 1 a perspective view of a package of kitchen paper towel rolls formed by arranging 3 rolls of the kitchen paper towel roll shown and performing film packaging. Detailed Embodiments

[0039] Hereinafter, the mode for implementing the present invention (hereinafter simply referred to as "this embodiment") will be described in detail. The following embodiments are examples for explaining the present invention and are not intended to limit the present invention to the following content. The present invention can be appropriately modified and implemented within the scope of its gist.

[0040] In addition, in the kitchen paper towel sheet, the MD direction refers to the traveling direction (Machine Direction) when the kitchen paper towel sheet is made by papermaking, and the CD direction refers to the direction perpendicular to the MD direction (Cross Direction).

[0041] <Kitchen paper towel roll>

[0042] Figure 1 is a perspective view of the kitchen paper towel roll 1 according to an embodiment of the present invention. As Figure 1 shown, the kitchen paper towel roll 1 of this embodiment is a kitchen paper towel roll 1 as follows: A sheet having an embossed pattern applied to one or both of the two-layer sheets is bonded using glue or water, and the two-layer kitchen paper towel sheets 1x are wound into a roll shape. In addition, the kitchen paper towel sheet 1x is preferably provided with perforation lines (not shown) in the width direction of the roll at substantially equal intervals in the roll direction of the roll.

[0043] In addition, as Figure 1 shown, the surface of the kitchen paper towel sheet 1x that points to the outside of the roll is called the surface 1a (the surface of the kitchen paper towel sheet 1x), and the surface that points to the center of the roll is called the back surface 1b (the back surface of the kitchen paper towel sheet 1x). In addition, the end of the kitchen paper towel sheet 1x is called the outermost peripheral edge 1e of the kitchen paper towel roll 1.

[0044] As the use of the kitchen paper towel roll 1, for example, a roll body (kitchen paper roll) of kitchen paper (sometimes also called paper towel, cooking paper, etc.) used for wiping moisture or oil and removing stains in a home kitchen, a kitchen in a restaurant, etc., a roll body of other toilet paper, etc. can be cited.

[0045] (Roll length and roll diameter)

[0046] The lower limit of the roll length of the kitchen paper towel roll 1 is preferably 14 m or more, more preferably 21 m or more, and still more preferably 25 m or more. In addition, the upper limit is preferably 44 m or less, more preferably 37 m or less, and still more preferably 33 m or less. By setting the roll length within the above numerical range, the roll diameter DR described later can be set within an appropriate range.

[0047] The roll length is measured as follows. First, for the kitchen paper sheet 1x between the perforation lines of the kitchen paper roll 1, the lengths of 10 sheet quantities are actually measured. Then, the number of sheets of the kitchen paper roll 1 is actually measured, and the roll length is obtained by proportional calculation based on the length of 10 sheet quantities and the number of sheets. For example, when the length of 10 sheet quantities is 1.80 m and the number of sheets is 150, 1.80 m × (150 / 10) = 27 m. In addition, when there is no perforation line on the kitchen paper roll 1, the roll length is actually measured.

[0048] The roll diameter DR of the kitchen paper roll 1 of the present embodiment is preferably 110 mm or more and 189 mm or less. By setting the roll diameter DR within the above numerical range, a kitchen paper roll 1 with a soft touch and a firm feeling can be produced.

[0049] In addition, the lower limit value of the roll diameter DR is more preferably 130 mm or more, and further preferably 140 mm or more. The upper limit value is more preferably 176 mm or less, and further preferably 163 mm or less.

[0050] The roll diameter DR of the roll paper is actually measured using a diameter gauge manufactured by MURATEC-KDS Co., Ltd. The measurement is performed on 3 kitchen paper rolls 1, and the measurement results are averaged.

[0051] (Roll paper width and roll paper weight)

[0052] The lower limit of the roll paper width of the kitchen paper roll 1 is preferably 150 mm or more, more preferably 200 mm or more, and further preferably 250 mm or more. In addition, the upper limit is preferably 380 mm or less, more preferably 340 mm or less, and further preferably 300 mm or less. By setting the roll paper width within the above numerical range, a kitchen paper roll 1 that maintains the grammage, strength, and water absorption within a certain range can be produced.

[0053] In addition, the lower limit of the roll paper weight of the kitchen paper roll 1 is preferably 160 g or more, more preferably 230 g or more, and further preferably 270 g or more. In addition, the upper limit is preferably 550 g or less, more preferably 450 g or less, and further preferably 380 g or less. By setting the roll paper weight within the above numerical range, a kitchen paper roll 1 that maintains the grammage, strength, and water absorption within a certain range can be produced.

[0054] In addition, the lower limit of the weight per 280 mm of the roll width of the kitchen paper towel roll 1 is preferably 160 g or more, more preferably 230 g or more, and further preferably 270 g or more. In addition, the upper limit is preferably 550 g or less, more preferably 450 g or less, and further preferably 380 g or less. By setting the weight per 280 mm of the roll width within the above numerical range, it is possible to produce the kitchen paper towel roll 1 that maintains the basis weight, strength, and water absorption within a certain range.

[0055] The above-mentioned roll weights are all set to exclude the weight of the roll core (hereinafter, also referred to as the paper tube, core) in the kitchen paper towel roll 1. When the roll width is not 280 mm, the weight per 280 mm is converted by proportional calculation.

[0056] (Roll density)

[0057] The lower limit of the roll density of the kitchen paper towel roll 1 of the present embodiment is preferably 0.04 g / cm 3 or more, more preferably 0.05 g / cm 3 or more, and further preferably 0.06 g / cm 3 or more. In addition, the upper limit is preferably 0.15 g / cm 3 or less, more preferably 0.13 g / cm 3 or less, and further preferably 0.09 g / cm 3 or less. By setting the roll density within the above numerical range, it is possible to produce the kitchen paper towel roll 1 that has a soft touch and also has a solid feeling.

[0058] The roll density is represented by (roll weight) ÷ (volume of the roll). The roll weight is the weight of the kitchen paper towel roll 1 per 280 mm of roll width. The roll volume is represented by [(cross-sectional area of the outer diameter (roll diameter DR) part of the roll) - (cross-sectional area of the outer diameter DI of the roll core)] × roll width (converted to per 280 mm). For example, when the weight per 280 mm of the roll width (excluding the roll core) is 382 g, the roll diameter DR is 150 mm, and the outer diameter DI of the roll core is 39 mm, the roll density = 382 g ÷ [(3.14 × (150 mm ÷ 2 ÷ 10)2 - 3.14 × (39 mm ÷ 2 ÷ 10)2) × (280 mm ÷ 10)] = 0.08 g / cm 3 .

[0059] (Roll density)

[0060] The lower limit of the roll density of the kitchen paper towel roll 1 of the present embodiment is preferably 0.22 m / cm 2 or more, more preferably 0.25 m / cm 2 or more, and further preferably 0.28 m / cm2 Above. Additionally, the upper limit is preferably 0.68 m / cm 2 Below, more preferably 0.54 m / cm 2 Below, further preferably 0.40 m / cm 2 Below. By making the winding density of the kitchen paper towel roll 1 within the above numerical range, a kitchen paper towel roll 1 with a soft touch and a sense of firmness can be produced.

[0061] The winding density is expressed as (winding length × number of layers) ÷ (cross-sectional area of the roll paper). The cross-sectional area of the roll paper is expressed as {cross-sectional area of the outer diameter (roll diameter DR) part of the roll paper - (cross-sectional area of the outer diameter DI part of the core)}. For example, when the winding length is 27 m, 2 layers, the roll diameter DR is 150 mm, and the outer diameter DI of the core is 39 mm, the winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10)² - 3.14 × (39 mm ÷ 2 ÷ 10)²} = 0.33 m / cm 2 .

[0062] Additionally, when the winding density of the starting part (more than 1% and less than 33%) of the roll paper in the kitchen paper towel roll 1 is set as a, the winding density of the middle part (more than 34% and less than 66%) is set as b, and the winding density of the ending part (100%) is set as c, the lower limit value of (a / c) × 100 (%) is preferably 90% or more, more preferably 95% or more, and further preferably 100% or more. Additionally, the upper limit value is preferably 130% or less, more preferably 120% or less, and further preferably 110% or less.

[0063] Similarly, the lower limit value of (b / c) × 100 (%) is preferably 95% or more, more preferably 98% or more, and further preferably 100% or more. The upper limit value is preferably 120% or less, more preferably 115% or less, and further preferably 110% or less.

[0064] When (a / c) × 100 (%) is less than 90% or (b / c) × 100 (%) is less than 95%, wrinkles are generated in the kitchen paper towel sheet 1x and the wiping property is reduced. When (a / c) × 100 (%) exceeds 130% or (b / c) × 100 (%) exceeds 120%, the embossing is damaged, the water absorption is reduced, or it becomes difficult to wipe. At this time, the winding density c of the ending part is the winding density in the unused kitchen paper towel roll 1.

[0065] Regarding the roll density in each part, the kitchen paper towel sheet 1x is unwound by a certain length (e.g., 50 cm) each time, the roll diameter is measured at the moment of unwinding, and the roll density is calculated. At this time, the "roll length" in the above formula is calculated using the value obtained by subtracting the "unwound length" from the "roll length of the kitchen paper towel roll 1". Repeat this operation to obtain the roll density b of the middle part and the roll density a of the starting part of winding.

[0066] In addition, it is expressed as 1% to 100% from the start to the end of the winding of the roll paper. At this time, 0% corresponds to the outermost edge of the outer diameter of the following core (roll core outer diameter DI). When performing winding processing on the kitchen paper towel roll 1 using a roll paper winder, the roll density of each part can be controlled by the timing of accelerating and decelerating the winding speed immediately after the start of winding and the adjustment of the clamping pressure of the rider roll.

[0067] (Roll softness)

[0068] The roll softness of the kitchen paper towel roll 1 of the present embodiment is preferably 1.2 mm or more and 4.0 mm or less. By setting the roll softness within the above numerical range, a kitchen paper towel roll 1 with a soft touch and a firm feeling can be produced. In addition, the lower limit value of the roll softness is more preferably 1.5 mm or more, and further preferably 1.7 mm or more. The upper limit value is more preferably 3.5 mm or less, and further preferably 3.0 mm or less.

[0069] In the kitchen paper towel roll 1 of the present invention, since it is a kitchen paper towel roll 1 with a relatively long roll length as described above, when evaluating the softness of the kitchen paper towel roll 1, by evaluating the above roll softness, the softness when holding the kitchen paper towel roll 1 can be evaluated.

[0070] The roll softness of the kitchen paper towel roll 1 is measured as follows using a compression testing machine (handheld compression testing machine KES-G5 manufactured by Kato Tech Co., Ltd.). In addition, the direction parallel to the axis of the kitchen paper towel roll 1 is set as the height direction, and the direction perpendicular to the tangent of the circumference of the kitchen paper towel roll 1 is set as the radial direction.

[0071] First, place the kitchen paper towel roll 1 horizontally on a hard table with the axis horizontal. Then, press the compression part (area 2.0 cm 2 ) of the above KES-G5 into the central part in the height direction of the kitchen paper towel roll 1 from above along the radial direction at a speed of 10 mm / minute. The penetration depth when the pressure of the compression part pressing the roll paper is 5 gf / cm 2 is set as T0, and the penetration depth when the pressure is 150 gf / cm 2 is set as T m , and calculate (T m-(T0). Next, rotate the kitchen paper towel roll 1 90 degrees circumferentially about its core as the axis of rotation, and measure the penetration depth T in the same manner as above m and T0, and find T m The difference from T0 (T m -T0). As described above, one kitchen paper towel roll is measured twice. That is, for 3 kitchen paper towel rolls 1, each is measured 2 times one by one, and the average of the total 6 times (= 2 times / roll × 3 rolls) of measurement results is used as the final roll softness.

[0072] (Core outer diameter)

[0073] In addition, the lower limit of the core outer diameter DI of the core of the kitchen paper towel roll 1 of the present invention is preferably 30 mm or more, more preferably 35 mm or more, and further preferably 40 mm or more. In addition, the upper limit is preferably 60 mm or less, more preferably 55 mm or less, and further preferably 50 mm or less. By having the core outer diameter DI within the above numerical range, a kitchen paper towel roll 1 with a soft touch and a solid feel can be produced.

[0074] The core outer diameter DI is measured using a diameter gauge manufactured by MURATEC-KDS Co., Ltd. The measurement is performed by measuring 3 kitchen paper towel rolls 1 and averaging the measurement results. In addition, when there is no core (paper tube) in the core, the outer diameter of the hole in the core part is measured.

[0075] In addition, the lower limit of the apparent grammage of the paper tube of the core is preferably 300 g / m 2 or more, more preferably 320 g / m 2 or more, and further preferably 350 g / m 2 or more. In addition, the upper limit is preferably 550 g / m 2 or less, more preferably 500 g / m 2 or less, and further preferably 450 g / m 2 or less. By having the apparent grammage of the paper tube within the above numerical range, a kitchen paper towel roll 1 with a soft touch and a solid feel can be produced.

[0076] Moreover, the lower limit of the weight of the paper tube per 280 mm of the paper width of the paper tube of the core is preferably 7 g or more, more preferably 10 g or more, and further preferably 13 g or more. In addition, the upper limit is preferably 25 g or less, more preferably 22 g or less, and further preferably 18 g or less. By having the weight of the paper tube per 280 mm of the paper width within the above numerical range, a kitchen paper towel roll 1 that maintains the grammage, strength, and water absorption within a certain range can be produced.

[0077] In the case where the width of the roll is not 280 mm, the weight of the above-mentioned paper tube is converted to the weight per 280 mm by proportional calculation.

[0078] In addition, the base paper used in the paper tube as the core can be composed of 100% by mass of wood pulp, or can contain waste paper pulp, non-wood pulp, deinked pulp, waste paper from liquid beverage cartons, etc. However, from the viewpoint of quality, the weight content rate of pulp other than wood pulp, waste paper, etc. is preferably 50% or less, more preferably 30% or less, further preferably 10% or less, and most preferably 0%.

[0079] In order to obtain the target quality, the weight content rate of NBKP (needle-leaf tree bleached kraft pulp) is preferably 0% or more and 50% or less, more preferably 0% or more and 30% or less, further preferably 0% or more and 10% or less. In addition, the weight content rate of LBKP (broad-leaf tree bleached kraft pulp) is preferably 50% or more and 100% or less, more preferably 70% or more and 100% or less, further preferably 90% or more and 100% or less.

[0080] <Kitchen tissue sheet>

[0081] (Grammage)

[0082] The grammage of one layer of the kitchen tissue sheet 1x in this embodiment is 16 g / m 2 or more and 27 g / m 2 or less. If the grammage of one layer is less than 16 g / m 2 , the water absorbency of the kitchen tissue sheet is poor. In addition, if the grammage of one layer exceeds 27 g / m 2 , the manufacturing cost becomes high.

[0083] The grammage of the kitchen tissue sheet 1x can be measured based on JIS P 8124. In addition, the lower limit value of the grammage of one layer of the kitchen tissue sheet 1x is preferably 18 g / m 2 or more, more preferably 20 g / m 2 or more. The upper limit value is preferably 25 g / m 2 or less, more preferably 23 g / m 2 or less.

[0084] (Paper thickness)

[0085] The paper thickness of the kitchen tissue sheet 1x is preferably 1.3 mm / 10 layers or more and 5.0 mm / 10 layers or less. If the paper thickness is less than 1.3 mm / 10 layers, the water absorbency and firmness of the kitchen tissue sheet are poor. If the paper thickness exceeds 5.0 mm / 10 layers, the manufacturing cost becomes high.

[0086] The paper thickness can be measured using a thickness gauge (the dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 37.85 gf / cm 2 , a probe diameter of 30 mm. Place the specimen between the probe and the measurement table, and read the gauge when the probe is lowered at a speed of 1 mm or less per second. As the specimen, use 10 layers (the quantity of 5 sets of 2 layers) of the kitchen paper towel sheet 1x for measurement. In addition, repeat the measurement 10 times at different positions and average the measurement results.

[0087] In addition, the lower limit value of the paper thickness of the kitchen paper towel sheet 1x is more preferably 2.0 mm / 10 layers or more, and further preferably 2.6 mm / 10 layers or more. The upper limit value is more preferably 4.4 mm / 10 layers or less, and further preferably 3.8 mm / 10 layers or less.

[0088] (Specific volume)

[0089] The specific volume of the kitchen paper towel sheet 1x is preferably 7.6 cm 3 / g or more and 19.2 cm 3 / g or less. If the specific volume of the kitchen paper towel sheet 1x is less than 7.6 cm 3 / g, the softness of the kitchen paper towel sheet 1x is poor. In addition, if the specific volume of the kitchen paper towel sheet 1x exceeds 19.2 cm 3 / g, the firmness of the kitchen paper towel sheet 1x is poor.

[0090] In addition, the lower limit value of the specific volume of the kitchen paper towel sheet 1x is more preferably 11.1 cm 3 / g or more, and further preferably 12.4 cm 3 / g or more. The upper limit value is more preferably 17.6 cm 3 / g or less, and further preferably 16.5 cm 3 / g or less. The specific volume is obtained by dividing the paper thickness of each layer of the kitchen paper towel sheet 1x by the grammage of each layer, and is expressed in volume per unit (g) (cm 3 ).

[0091] (DMDT, DCDT, and GMT)

[0092] The dry MD direction tensile strength DMDT (Dry Machine Direction Tensile Strength) of the kitchen paper towel sheet 1x based on JIS P 8113 is 600 gf / 25 mm or more and 1500 gf / 25 mm or less.

[0093] In addition, the dry cross-direction tensile strength DCDT (Dry Cross Direction Tensile Strength) of the kitchen paper sheet 1x based on JIS P 8113 is 600 gf / 25 mm or more and 1500 gf / 25 mm or less.

[0094] When DMDT or DCDT is less than 600 gf / 25 mm, as a result, the firmness and breakage resistance of the kitchen paper sheet 1x are poor. When DMDT or DCDT exceeds 1500 gf / 25 mm, as a result, the kitchen paper sheet 1x becomes hard and the softness is poor.

[0095] In addition, the lower limit value of DMDT is preferably 720 gf / 25 mm or more, more preferably 800 gf / 25 mm or more. The upper limit value is preferably 1350 gf / 25 mm or less, more preferably 1200 gf / 25 mm or less.

[0096] In addition, the lower limit value of DCDT is preferably 720 gf / 25 mm or more, more preferably 800 gf / 25 mm or more. The upper limit value is preferably 1350 gf / 25 mm or less, more preferably 1200 gf / 25 mm or less.

[0097] In addition, the lower limit value of GMT, which is the square root of the product of DMDT and DCDT, is preferably 600 gf / 25 mm or more, more preferably 720 gf / 25 mm or more, and further preferably 800 gf / 25 mm or more. The upper limit value is preferably 1500 gf / 25 mm or less, more preferably 1350 gf / 25 mm or less, and further preferably 1200 gf / 25 mm or less.

[0098] When GMT is less than 600 gf / 25 mm, as a result, the firmness and breakage resistance of the kitchen paper sheet 1x are poor. When GMT exceeds 1500 gf / 25 mm, as a result, the kitchen paper sheet 1x becomes hard and the softness is poor.

[0099] In addition, the ratio of DMDT to DCDT (DMDT / DCDT) is 0.3 or more and 2.5 or less. When the ratio is less than 0.3, DMDT is within a certain range while DCDT becomes high, and the softness of the kitchen paper sheet 1x is poor. When it exceeds 2.5, DCDT is within a certain range while DMDT becomes high, and the softness of the kitchen paper sheet 1x is poor.

[0100] In addition, the lower limit value of the ratio of DMDT to DCDT (DMDT / DCDT) is preferably 0.5 or more, more preferably 0.7 or more. The upper limit value is preferably 1.5 or less, more preferably 1.3 or less.

[0101] The DMDT and DCDT of the kitchen paper sheet 1x are obtained by measuring in the state of two layers according to JIS P 8113, and calculating the ratio (DMDT / DCDT) based on the measured DMDT and DCDT. In addition, GMT is calculated from the square root of the product of the measured DMDT and DCDT.

[0102] (WMDT and WCDT)

[0103] The lower limit of the wet MD direction tensile strength WMDT (Wet Machine Direction Tensile Strength) of the kitchen paper sheet 1x based on the old JIS S 3104 (1999) is preferably 190 gf / 25 mm or more, more preferably 240 gf / 25 mm or more, and further preferably 270 gf / 25 mm or more. The upper limit is preferably 540 gf / 25 mm or less, more preferably 480 gf / 25 mm or less, and further preferably 430 gf / 25 mm or less.

[0104] In addition, the lower limit of the wet CD direction tensile strength WCDT (Wet Cross Direction Tensile Strength) of the kitchen paper sheet 1x based on the old JIS S3104 (1999) is preferably 190 gf / 25 mm or more, more preferably 240 gf / 25 mm or more, and further preferably 270 gf / 25 mm or more. The upper limit is preferably 540 gf / 25 mm or less, more preferably 480 gf / 25 mm or less, and further preferably 430 gf / 25 mm or less.

[0105] If the WMDT is less than 190 gf / 25 mm or the WCDT is less than 190 gf / 25 mm, the firmness and breakage resistance of the kitchen paper sheet 1x are poor. If the WMDT exceeds 540 gf / 25 mm or the WCDT exceeds 540 gf / 25 mm, as a result, the softness of the kitchen paper sheet 1x is poor.

[0106] In addition, the lower limit of the ratio of WMDT to WCDT (WMDT / WCDT) is preferably 0.3 or more, more preferably 0.5 or more, and further preferably 0.7 or more. The upper limit is preferably 2.5 or less, more preferably 1.5 or less, and further preferably 1.3 or less.

[0107] If the ratio is less than 0.3, then the WMDT is within a certain range while the WCDT becomes higher, and the softness of the kitchen paper sheet 1x is poor, or the WMDT becomes lower, and the firmness and tear resistance of the kitchen paper sheet 1x are poor. If the ratio exceeds 2.5, then the WCDT is within a certain range while the WMDT becomes higher, and the softness of the kitchen paper sheet 1x is poor, or the WCDT becomes lower, and the firmness and tear resistance of the kitchen paper sheet 1x are poor.

[0108] The WMDT and WCDT of the kitchen paper sheet 1x are measured in a two-layer state according to the old JIS S 3104 (1999).

[0109] (Elongation rate)

[0110] In addition, the elongation rate of the kitchen paper sheet 1x in the MD direction based on JIS P 8113 is preferably 6% or more and 15% or less. If the elongation rate of the kitchen paper sheet 1x in the MD direction is less than 6%, the result is that the kitchen paper sheet 1x becomes hard and the softness is poor. Additionally, if the elongation rate of the kitchen paper sheet 1x in the MD direction exceeds 15%, the result is that the firmness of the kitchen paper sheet 1x is poor.

[0111] In addition, the lower limit value of the elongation rate of the kitchen paper sheet 1x in the MD direction is more preferably 8% or more, and further preferably 10% or more. The upper limit value is more preferably 14% or less, and further preferably 13% or less.

[0112] Moreover, the elongation rate of the kitchen paper sheet 1x in the CD direction based on JIS P 8113 is preferably 3% or more and 10% or less. If the elongation rate of the kitchen paper sheet 1x in the CD direction is less than 3%, the result is that the kitchen paper sheet 1x becomes hard and the softness is poor. Additionally, if the elongation rate of the kitchen paper sheet 1x in the CD direction exceeds 10%, the result is that the firmness of the kitchen paper sheet 1x is poor.

[0113] In addition, the lower limit value of the elongation rate of the kitchen paper sheet 1x in the CD direction is more preferably 4% or more, and further preferably 5% or more. The upper limit value is more preferably 8% or less, and further preferably 6% or less.

[0114] The elongation rate of each direction of the kitchen paper sheet 1x can be measured according to the method described in JIS P 8113.

[0115] (Bending resistance)

[0116] The bending resistance of the kitchen paper towel sheet 1x in both the MD direction and the CD direction is 4.5 mN or more and 22.0 mN or less. If the bending resistance in either the MD direction or the CD direction of the kitchen paper towel sheet 1x is less than 4.5 mN, the grammage and strength of the kitchen paper towel sheet 1x are low, and the sense of firmness and the resistance to breakage are poor. Additionally, if the bending resistance in either the MD direction or the CD direction of the kitchen paper towel sheet 1x exceeds 22.0 mN, the kitchen paper towel sheet 1x becomes hard and the softness is poor.

[0117] Furthermore, the lower limit value of the bending resistance of the kitchen paper towel sheet 1x in both the MD direction and the CD direction is preferably 7.5 mN or more, more preferably 10.5 mN or more. Additionally, the upper limit value is preferably 17.5 mN or less, more preferably 15.5 mN or less.

[0118] The bending resistance of each direction of the kitchen paper towel sheet 1x can be measured using an L&W bending tester (manufactured by Lorentzen & Wettre) according to the method described in JIS P 8125-1:2017 (ISO2493). For a test piece of the kitchen paper towel sheet 1x with a width of 38 mm and a length of 100 mm, the measured value in each direction when the bending angle is set to 15 degrees and the bending length (span of the specimen stage) is set to 10 mm is defined as the bending resistance (load). The above measurement is performed in a two-layer state for each of the MD direction and the CD direction.

[0119] Furthermore, in the case where the interval of the perforation lines on the sheet is short and a test piece with a length of 100 mm cannot be collected, the length of the test piece can be shortened.

[0120] (Peel strength)

[0121] In addition, the peel strength of the kitchen paper towel sheet 1x is preferably 0.03 N / 100 mm or more and 0.5 N / 100 mm or less. If the peel strength of the kitchen paper towel sheet 1x is less than 0.03 N / 100 mm, the kitchen paper towel sheet 1x is prone to layer peeling and the sense of firmness is poor. Additionally, if the peel strength of the kitchen paper towel sheet 1x exceeds 0.5 N / 100 mm, the kitchen paper towel sheet 1x becomes hard and the softness is poor.

[0122] Furthermore, the lower limit value of the peel strength of the kitchen paper towel sheet 1x is more preferably 0.1 N / 100 mm or more, further preferably 0.2 N / 100 mm or more. The upper limit value is more preferably 0.4 N / 100 mm or less, further preferably 0.35 N / 100 mm or less. The peel strength of the kitchen paper towel sheet 1x is measured as follows.

[0123] The measurement of the peel strength was carried out according to the tensile test method of JIS P 8113, using a tensile testing machine (STB-1225S, manufactured by A&D Company, Ltd.), under the standard conditions specified in JIS P 8111.

[0124] First, three rectangular test pieces of 65 mm × 100 mm were collected from the sample of the kitchen paper sheet 1x. At this time, in various ways with respect to the traveling direction and the width direction of the sheet, for example, one piece in the MD direction, one piece in the CD direction, and one piece in the inclined direction that is in the middle between the MD direction and the CD direction were taken, and the layer was peeled by 15 mm in the short side (65 mm) direction. At this time, the unpeeled part was 50 mm. Next, two acrylic plates or the like were prepared and clamped with upper and lower jigs. In addition, the distance (interval) between the two acrylic plates clamped by the upper and lower jigs was 1 mm to the extent that the sheet could enter between the upper and lower jigs. The size of the acrylic plate only needs to be larger than the jig and the test piece, but if it is a rectangle of about 85 mm × 110 mm, it is easy to set the test piece. Next, one side of the peeled layer was pasted and fixed to the upper acrylic plate using tape or the like. In addition, the other layer was also pasted and fixed to the lower acrylic plate using tape or the like. The tape was longer than 100 mm, and the entire long side (100 mm) of the test piece was firmly fixed. If the acrylic plate is a rectangle of 85 mm × 110 mm, it is preferably pasted to the 110 mm side with tape. Next, the 50 mm test piece was stretched (peeled) under the condition that the stretching speed was 100 mm / minute, and the strength data was collected. The strength data was subjected to chart analysis, and the extreme value analysis range was selected. The extreme value analysis range was selected in such a way that the values of the first 10% and the last 10% just after the measurement were omitted, and this was taken as the peel strength (N / 100 mm).

[0125] (Water absorption amount)

[0126] In the present invention, the water absorption amount per unit area of the kitchen paper sheet 1x is 330 g / m 2 or more and 600 g / m 2 or less. If the water absorption amount per unit area is less than 330 g / m 2 , the water absorption property of the kitchen paper sheet 1x is poor. In addition, if the water absorption amount per unit area exceeds 600 g / m 2 , the basis weight of the kitchen paper sheet 1x becomes high and the cost becomes high.

[0127] In addition, the lower limit value of the water absorption amount per unit area of the kitchen paper sheet 1x is preferably 400 g / m 2 or more, more preferably 420 g / m 2 or more. The upper limit value is preferably 500 g / m 2 or less, more preferably 460 g / m 2 or less.

[0128] In addition, the lower limit value of the water absorption amount per unit weight of the kitchen paper sheet 1x is preferably 6 g / g or more, more preferably 8 g / g or more, and further preferably 10 g / g or more. The upper limit value is preferably 18 g / g or less, more preferably 15 g / g or less, and further preferably 13 g / g or less.

[0129] If the water absorption amount per unit weight is less than 6 g / g, the water absorption property of the kitchen paper sheet 1x is poor. If the water absorption amount per unit weight exceeds 18 g / g, the water absorption amount per sheet is excessive, or the manufacturing cost becomes high.

[0130] In addition, the following is referred to Figure 2 to illustrate the measurement method of each water absorption amount of the kitchen paper sheet 1x.

[0131] First, collect the kitchen paper sheet 1x overlapped in 2 layers, cut it using a template of a square with one side being 7.6 cm (3 inches) to produce a test piece 10 in the shape of a rectangle with one side being 7.6 cm. Measure the weight of the test piece 10 before water absorption with an electronic balance. Set the test piece 10 on the support 12 (a jig that fixes three points of the test piece, and the jig is made of a metal that does not absorb water).

[0132] Next, put distilled water in a commercially available tray until the depth is 2 cm, and immerse the test piece 10 set on the support 12 in the distilled water for 2 minutes. After immersing for 2 minutes, take out the test piece 10 and the support 12 together from the distilled water. As Figure 2 shown, stick a tape 11 on one corner 10d of the test piece 10. Regarding the tape 11, peel the same kitchen paper as the 2 - layer kitchen paper to be measured into 1 layer, cut this 1 - layer paper kitchen paper into a size of 2 mm × 15 mm in length, and stick it on the part 6 mm from the corner 10d of the test piece 10 toward the center. Then, hang the support 12 and the test piece 10 on a rod set in an empty water tank with the corner 10a opposite to the corner 10d facing upward, close the lid of the water tank and leave it for 15 minutes.

[0133] Then, take out the support 12 and the test piece 10 from the water tank, remove the tape 11 and the support 12, and measure the weight of the test piece 10 with an electronic balance. According to the weight change of the test piece 10 before and after immersion in distilled water, calculate the water absorption amount of distilled water per unit area of the test piece 10 (water g / sheet m 2 ², per 1 m 2 ²; abbreviated as g / m 2 ²). Furthermore, by dividing the water absorption amount per unit area (water g / sheet m 2 ²) by the grammage of the product layer of the test piece 10, the water absorption amount per unit area (water g / sheet m 2 ²) / grammage (sheet g / sheet m2 ) = Water absorption per unit weight (g of water / g of sheet, per 1 g; abbreviated as g / g). Each sample was measured 5 times, and the average value was used.

[0134] This measurement was carried out in accordance with JIS P 8111 method under the conditions of temperature 23 ± 1°C and humidity 50 ± 2%. In addition, the distilled water was maintained at 23 ± 1°C.

[0135] (Embossing)

[0136] The kitchen paper towel roll 1 (kitchen paper towel sheet 1x) of this embodiment is formed by embossing and has an embossed pattern. In addition, in the present invention, after embossing one or both of the two layers of sheets, they are laminated to form two layers. When laminating the two layers, an adhesive treatment is performed with a laminating adhesive (paste) or water, and a laminating adhesive is preferably used. By bonding in this way to form two layers, the bonding of the layers becomes stronger, and even when the kitchen paper towel sheet 1x is wetted with water, layer peeling does not occur and it is difficult to break.

[0137] In addition, the embossing treatment is preferably performed on one of the two layers of sheets, and more preferably on the layer of the surface 1a of the two layers of sheets.

[0138] As described above, it is preferable to apply an embossed pattern to the layer of the surface 1a of the kitchen paper towel sheet 1x. By applying an embossed pattern to the surface 1a, an adhesive can be applied to the embossed portion of the embossed pattern for bonding treatment, it is difficult to cause layer peeling of the kitchen paper towel sheet 1x, and the water absorption can be within a certain range.

[0139] In addition, the embossed pattern is not particularly limited as long as it is a pattern such as dots or lines that are usually applied to kitchen paper towels. Among them, a linear embossed pattern is preferred. As a linear embossed pattern, specifically, as Figure 3 shown, as long as one pattern is a pattern that includes two of each of two types of figures: a roughly circular shape that includes a roughly circular shape and other patterns inside it, and a figure that is roughly line-symmetrical in the vertical and horizontal directions as a whole and includes a combination of multiple curves and figures, there is no particular limitation. Regarding the roughly circular shape, it is preferable that the roughly circular shape is double-layered.

[0140] In addition, as the size of the embossed pattern, the quadrilateral E (E is not the embossed pattern) surrounding the embossed pattern is preferably a square with side lengths of 2 cm or more and 25 cm or less for each side, more preferably a square with side lengths of 5 cm or more and 20 cm or less for each side, and still more preferably a square with side lengths of 8 cm or more and 15 cm or less for each side. Regarding this quadrilateral E, it is preferably parallel to the traveling direction of the kitchen paper towel roll 1 in the longitudinal direction and parallel to the width direction of the kitchen paper towel roll 1 in the transverse direction, but it can also be inclined. By using such a pattern, in the kitchen paper towel sheet 1x with high water absorption as in the present application, good water absorption can be achieved, the layers are difficult to peel off, the strength can be maintained, and thus a firm feeling is generated.

[0141] At this time, in the linear embossed pattern, the area occupied by the embossing with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more is preferably 4% or more and 50% or less of the area of the kitchen paper towel sheet 1x. If the ratio is less than 4%, the firmness of the kitchen paper towel sheet 1x is poor and it is easily damaged. If the ratio exceeds 50%, the softness of the kitchen paper towel sheet 1x is poor.

[0142] Regarding the above-mentioned area ratio, as in Figure 3 such, inside the quadrilateral E including all one embossed pattern, for the embossing with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more, the total length when adding the embossing length is measured as the total length, and the total length (mm) × width (mm) is calculated as the area of the embossing. It is calculated as (area of the embossing / area of one sheet of the kitchen paper towel sheet 1x) × 100 (%) when the area of one sheet of the kitchen paper towel 1x is set as (length of one sheet of the sheet × width of the sheet).

[0143] In addition, the size of one side of this quadrilateral E can be appropriately changed according to the size of the embossed pattern. Also, in the case where the quadrilateral including all the embossed patterns contains an embossed pattern adjacent to the embossed pattern contained in the quadrilateral, the length of the adjacent embossed pattern is also measured and included in the total length. In the case where it is impossible to clearly determine the size of one side of the quadrilateral E due to the embossed pattern, the size of the quadrilateral E is set to 10 × 10 cm, and the total length of the embossing length contained in this quadrilateral E is measured. The total length is obtained by actual measurement with a scale, a measuring ruler, etc. by the above method. In addition, in the case where it is difficult to visually observe the embossing, a general microscope can also be used for measurement.

[0144] In addition, with respect to the area of the kitchen paper towel sheet 1x, in the linear embossed pattern, the lower limit value of the ratio of the area occupied by the embossing with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more is more preferably 6% or more, and still more preferably 9% or more. The upper limit value is more preferably 35% or less, and still more preferably 16% or less.

[0145] In the embossed pattern, the depth of the embossing is preferably 0.06 mm or more and 1.05 mm or less. If the depth of the embossing is less than 0.06 mm, the softness of the kitchen paper towel sheet 1x is poor. If the depth exceeds 1.05 mm, the firmness and breakage resistance of the kitchen paper towel sheet 1x are poor.

[0146] Furthermore, the lower limit value of the depth of the embossing in the embossed pattern is more preferably 0.10 mm or more, and further preferably 0.14 mm or more. The upper limit value is more preferably 0.55 mm or less, and further preferably 0.35 mm or less.

[0147] The depth of the embossing is measured using a microscope. As the microscope, a product named "One-Shot 3D Measurement Microscope VR-3100" manufactured by KEYENCE Corporation can be used. As the observation / measurement / image analysis software for the microscope images, a product named "VR-H1A" can be used. Additionally, the measurement conditions are carried out under the conditions of a magnification of 25 times and a field of view area of 12 mm × 9 mm. The measurement magnification and field of view area can be appropriately changed according to the size of the embossing obtained.

[0148] Figure 4 The height distribution on the X-Y plane based on the microscope is shown, and the height of the surface of the kitchen paper towel sheet 1x is shown in shades. Figure 4 The linear parts with shades different from the surroundings represent each embossing. The depth of the embossing is obtained by measuring the height difference of the embossing using the above microscope. Additionally, the measurement is carried out on the surface 1a side of the kitchen paper towel sheet 1x. Also, during the measurement, three turns of the kitchen paper towel sheet 1x are removed from the kitchen paper towel roll 1, and the fourth turn of the kitchen paper towel sheet 1x is used for the measurement in the state of two layers of sheets. Also, in the case of having a perforation line, the measurement is avoided.

[0149] First, as Figure 4 shown, draw a line segment AB to obtain Figure 5 the height distribution. Additionally, the line segment AB can be drawn in a way that crosses the embossing. Also, the line segment AB is drawn in a way that becomes the width direction (CD direction) of the kitchen paper towel sheet 1x, but in the case where the interval between the embossings is narrow to, for example, 2 mm or less and the height of the following convex part becomes low, the line segment can also be drawn in an inclined direction or in the running direction (MD direction). Figure 5 The height distribution is a (measurement) cross-sectional curve S representing the unevenness of the surface of the actual kitchen paper towel sheet 1x sample, but it also includes noise (there are fiber lumps on the surface of the kitchen paper towel sheet 1x, fibers extend like whiskers, and sharp peaks caused by parts without fibers). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0150] Therefore, Figure 5 the size of the filter of the weighted average radio button for the (measurement) cross-sectional curve S is set to ±12, and the smoothed Figure 6 cross-sectional curve W is obtained. In addition, if the above-mentioned analysis software is used, the smoothing using the filter of the weighted average radio button is automatically obtained. Then, in the Figure 6 shown graph, the average value of the respective maximum values of the vertical axes of the convex part H1 of the graph and the convex part H2 adjacent to the convex part H1 is calculated, and the minimum value of the vertical axis of the concave part D1 sandwiched between the convex part H1 and the convex part H2 is obtained. The value obtained by subtracting the minimum value from the average value of the maximum values thus obtained is used as the tentative embossing depth. Then, as Figure 6 shown, the same measurement is performed at a total of two places continuous on the cross-sectional curve (a total of two places where the concave part D1 and the concave part D2 sandwiched between the convex part H3 and the convex part H4 are continuous) (two measurement results are obtained at this time). After that, the same measurement as described above is performed at each position where the kitchen paper towel roll 1 is divided into three rotations every 90 degrees along the traveling direction of the kitchen paper towel sheet 1x (a total of 4 measurement positions in the traveling direction), and finally the average value of a total of 8 places (2×4) is adopted as the embossing depth.

[0151] In addition, the kitchen paper towel sheet 1x of the present invention has an uneven pattern derived from a papermaking process different from the embossing pattern, and therefore a deviation is observed in the height of the left and right convex parts sandwiching the concave part. Therefore, when the difference in the vertical axis values between the convex parts sandwiching the concave part (for example, the convex part H3 and the convex part H4 sandwiching the concave part D2) is 0.2 mm or more, the measurement is performed at a part avoiding this part.

[0152] In addition, the root mean square height Sq of the surface roughness of the part of the kitchen paper towel sheet 1x where the embossing pattern is not given (hereinafter, also referred to as the non-embossed part) is preferably 35 μm or more and 170 μm or less. When the root mean square height Sq of the surface roughness is less than 35 μm, the specific surface area of the surface layer becomes small, and the water absorption tends to be low. In addition, if the root mean square height Sq of the surface roughness exceeds 170 μm, the surface layer is likely to break during wiping, and the firmness is poor.

[0153] In addition, the lower limit value of the root mean square height Sq of the surface roughness is more preferably 50 μm or more, and further preferably 60 μm or more. The upper limit value is more preferably 150 μm or less, and further preferably 100 μm or less.

[0154] The root mean square height Sq of the surface roughness of the non-embossed part is measured using a microscope. As the microscope, similar to the depth of the above-mentioned embossing, a product named "One-Shot 3D Measurement Microscope VR-3100" manufactured by Keyence Corporation can be used. As the software for observing / measuring / image analysis of the microscope images, a product named "VR-H1A" can be used. Additionally, the measurement conditions are carried out under the conditions of a magnification of 38 times and a field of view area of 8 mm × 6 mm. The measurement magnification and field of view area can be appropriately changed according to the size of the embossing obtained.

[0155] For Figure 8 the obtained image shown, similar to the depth of the above-mentioned embossing, a filter is set. Specifically, by setting an S-filter (low-pass filter) to set the components with scales smaller than the cut-off wavelength and an L-filter (high-pass filter), the components with scales larger than the cut-off wavelength are removed from the image. Here, the S-filter is 500 μm and the L-filter is 8 mm. When the S-filter and L-filter are selected, the root mean square height Sq is automatically calculated.

[0156] Similar to the depth of the embossing, for the non-embossed part, three turns of the kitchen paper sheet 1x are removed from the kitchen paper roll 1, and the fourth turn of the kitchen paper sheet 1x is used for measurement in a two-layer sheet state. Additionally, in the case of having a perforation line, the measurements are all avoided. Two measurements are taken in the width direction of the kitchen paper roll 1, and then, at each position where the kitchen paper roll 1 is rotated three times at 90-degree intervals in the traveling direction of the kitchen paper sheet 1x, the above-mentioned same measurements are carried out (a total of 4 measurement positions in the traveling direction). Finally, the average value of a total of 8 positions (2 × 4) is adopted as the root mean square height Sq.

[0157] <Manufacturing method of kitchen paper roll>

[0158] The kitchen paper roll 1 of the present embodiment can be manufactured, for example, in the order of (1) papermaking and flocking, (2) embossing and bonding treatment, and (3) winding process of the roll paper. Additionally, in the manufacturing (papermaking) process of the kitchen paper sheet 1x, it is preferable to use the TAD papermaking technology.

[0159] At this time, in the papermaking process, it is preferable to apply an uneven pattern from a papermaking process (fabric) different from the above-mentioned embossing pattern to the kitchen paper sheet 1x. By having this uneven pattern, the water absorption of the kitchen paper sheet 1x is further increased.

[0160] In addition, the papermaking process source means that in the papermaking process of the kitchen paper sheet 1x, an uneven pattern is imparted between the headbox of the paper machine and the outlet of the Yankee dryer 22. Specifically, in Figure 7In a part of the papermaking process shown, concavities and convexities can be imparted by the belt pressing portion 20 disposed between the dewatering roll 21 and the Yankee dryer 22. In the belt pressing portion 20, by pressing the wet paper 24 and the concavity-convexity belt 23 (the concavity-convexity belt 23 surrounds the belt pressing portion 20 and the Yankee dryer 22) together, a concavity-convexity pattern can be imparted to the wet paper 24.

[0161] In addition, the concavity-convexity pattern can be appropriately changed by changing the pattern of the fabric (fine pattern, rough pattern). When the concavity-convexity pattern is changed, the specific volume (paper thickness) changes, but it is preferable to select a pattern such that the specific volume in the state of the wound paper falls within the above numerical range.

[0162] (Kitchen tissue paper wound roll package)

[0163] Furthermore, as Figure 9 shown, the kitchen tissue paper wound roll 1 of the present embodiment can also be manufactured and sold in the form of a kitchen tissue paper wound roll package 100, which is formed by packaging the kitchen tissue paper wound roll 1 in a state where three kitchen tissue paper wound rolls 1 are arranged adjacent to each other in a substantially parallel manner in the axial direction with a packaging film 200.

[0164] At this time, in the kitchen tissue paper wound roll package 100, the lower limit value of the percentage ((actual film circumference / theoretical circumference of the film) × 100 (%)) of the actual circumference of the packaging film 200 calculated from the roll diameter DR of the above-mentioned kitchen tissue paper wound roll 1 with respect to the theoretical circumference of the packaging film 200 is preferably 94% or more, more preferably 96% or more, and further preferably 98% or more. In addition, the upper limit value is preferably 100% or less, more preferably 99.7% or less, and further preferably 99.5% or less.

[0165] When the percentage is less than 94%, the size of the packaging film 200 becomes smaller, the kitchen tissue paper wound roll 1 is compressed by the packaging film 200, and the kitchen tissue paper wound roll 1 is easily flattened. When the percentage exceeds 100%, the stability (shape retention) of the kitchen tissue paper wound roll package 100 deteriorates, and the damage to the kitchen tissue paper wound roll 1 becomes larger.

[0166] In addition, the kitchen tissue paper wound roll package may also be a single-roll package or a two-roll package (not shown). At this time, the lower limit value of the percentage ((actual film circumference / theoretical circumference of the film) × 100 (%)) of the actual circumference of the packaging film 200 with respect to the theoretical circumference of the single-roll package is preferably 96% or more, more preferably 98% or more, and further preferably 99% or more. The upper limit value is preferably 108% or less, more preferably 105% or less, and further preferably 103% or less.

[0167] In addition, the lower limit value of the percentage of the actual perimeter of the packaging film 200 relative to the theoretical perimeter of the two-roll packaging ((actual film perimeter / theoretical film perimeter) × 100 (%)) is preferably 95% or more, more preferably 97% or more, and further preferably 98% or more. The upper limit value is preferably 105% or less, more preferably 103% or less, and further preferably 101% or less.

[0168] Furthermore, the lower limit value of the theoretical perimeter of the packaging film 200 is preferably 900 mm or more, more preferably 950 mm or more, and further preferably 1000 mm or more. The upper limit value is preferably 1250 mm or less, more preferably 1200 mm or less, and further preferably 1190 mm or less. In addition, the lower limit value of the actual film perimeter is preferably 880 mm or more, more preferably 940 mm or more, and further preferably 990 mm or more. The upper limit value is preferably 1230 mm or less, more preferably 1230 mm or less, and further preferably 1140 mm or less.

[0169] If the theoretical perimeter is less than 900 mm or the actual film perimeter is less than 880 mm, the roll diameter DR becomes smaller. In order to achieve a certain roll paper density, the grammage becomes lower, and as a result, the water absorption of the kitchen paper towel sheet 1x deteriorates. If the theoretical perimeter exceeds 1250 mm or the actual film perimeter exceeds 1230 mm, the roll diameter DR becomes larger, and the contact area between the roll papers becomes larger. Therefore, the damage to the kitchen paper towel roll 1 becomes larger.

[0170] In addition, in the case where the kitchen paper towel roll packaging is a single-roll packaging or a two-roll packaging, the lower limit value of the theoretical perimeter of the single-roll packaging is preferably 390 mm or more, more preferably 420 mm or more, and further preferably 440 mm or more. The upper limit value is preferably 550 mm or less, more preferably 520 mm or less, and further preferably 500 mm or less. In addition, the lower limit value of the actual film perimeter is preferably 370 mm or more, more preferably 410 mm or more, and further preferably 430 mm or more. The upper limit value is preferably 530 mm or less, more preferably 510 mm or less, and further preferably 490 mm or less.

[0171] In addition, the lower limit value of the theoretical perimeter of the two-roll packaging is preferably 740 mm or more, more preferably 760 mm or more, and further preferably 770 mm or more. The upper limit value is preferably 850 mm or less, more preferably 830 mm or less, and further preferably 810 mm or less. In addition, the lower limit value of the actual film perimeter is preferably 720 mm or more, more preferably 750 mm or more, and further preferably 760 mm or more. The upper limit value is preferably 830 mm or less, more preferably 820 mm or less, and further preferably 800 mm or less.

[0172] A method for calculating the theoretical circumference of the packaging film 200 of the kitchen paper towel roll packaging body 100 is as follows. First, tear the packaging film 200 of the kitchen paper towel roll packaging body 100, take out all the kitchen paper towels, and measure the roll diameter DR respectively (in the case of 3 rolls, for 1 roll, measure at 1 place in the center of the roll width direction, and calculate the average value of the 3 rolls; in the case of 2 rolls, calculate the average value of the 2 rolls; in the case of 1 roll, measure at 2 places with 1 roll and calculate the average value of the 2 places respectively (the measurement position is 30 mm from the upper and lower cut surfaces of the roll)).

[0173] Then, calculate the theoretical circumference of the packaging film 200 based on the following formula.

[0174] The theoretical circumference of the packaging film 200 for 3 rolls = roll diameter × 4 + roll diameter × 3.14

[0175] The theoretical circumference of the packaging film 200 for 2 rolls = roll diameter × 2 + roll diameter × 3.14

[0176] The theoretical circumference of the packaging film 200 for 1 roll = roll diameter × 3.14

[0177] In addition, the actual circumference of the packaging film 200 is calculated by measuring the circumference direction R near the central part in the height direction of the kitchen paper towel roll packaging body 100 with a scale. In addition, in the case of the caramel packaging as shown Figure 9 a part of the packaging film 200 overlaps in the circumference direction R, but the overlapping part is not included in the circumference.

[0178] As described above, according to this embodiment, a kitchen paper towel roll can be provided, which does not have an excessive grammage but is maintained within a certain range, and maintains strength, water absorption, has a soft touch, and also has a sense of firmness.

[0179] Examples

[0180] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by any of the following examples.

[0181] (1) Through the processes of papermaking, embossing, (2) embossing and bonding, and (3) winding of the roll paper, kitchen paper towel rolls of Examples 1 to 18 and Comparative Examples 1 to 6 shown in Tables 1 and 2 are manufactured. Then, for the kitchen paper towel roll packaging bodies of all the examples and comparative examples, the above-mentioned various parameters are measured, and the following evaluations are carried out. In addition, the other parameters except for the following evaluations are carried out according to the above criteria or measurement methods.

[0182] 1. Grammage (cost)

[0183] The grammage of one layer of the kitchen paper sheet after actual measurement and manufacture is evaluated in four grades. The evaluation criteria are as follows.

[0184] ◎: 23 g / m 2 When it is below

[0185] ○: Higher than 23 g / m 2 and below 25 g / m 2 When it is below

[0186] △: Higher than 25 g / m 2 and below 27 g / m 2 When it is below

[0187] ×: Higher than 27 g / m 2 When it is

[0188] 2. Firmness (elasticity and stiffness of the sheet)

[0189] When holding the kitchen paper sheet after manufacture by hand, the firmness of the sheet is evaluated sensorially by 20 monitors, and it is evaluated in five grades according to the number of people who feel that "the elasticity and stiffness of the sheet are poor". The evaluation criteria are as follows.

[0190] ◎: The number of people who feel that "the elasticity and stiffness of the sheet are poor" is 0 - 3 people

[0191] ○: The number of people who feel that "the elasticity and stiffness of the sheet are poor" is 4 - 7 people

[0192] △: The number of people who feel that "the elasticity and stiffness of the sheet are poor" is 8 - 10 people

[0193] ×: The number of people who feel that "the elasticity and stiffness of the sheet are poor" is 11 - 15 people

[0194] ××: The number of people who feel that "the elasticity and stiffness of the sheet are poor" is more than 16 people

[0195] 3. Softness

[0196] The softness of the kitchen paper sheet when holding it by hand after manufacture is evaluated sensorially by 20 monitors, and it is evaluated in five grades according to the number of people who feel that "the sheet is hard". The evaluation criteria are as follows.

[0197] ◎: The number of people who feel that "the sheet is hard" is 0 - 3 people

[0198] ○: The number of people who feel that "the sheet is hard" is 4 - 7 people

[0199] △: The number of people who feel that "the sheet is hard" is 8 - 10 people

[0200] ×: The number of people who feel that "the sheet is hard" is 11 - 15 people

[0201] ××: The number of people who feel the "sheet is hard" is 16 or more

[0202] 4. Water absorption

[0203] The water absorption per unit area in two layers of the kitchen paper towel sheet after actual measurement of production is evaluated in four grades. The evaluation criteria are as follows.

[0204] ◎: 420 g / m 2 or more

[0205] ○: 400 g / m 2 or more and less than 420 g / m 2 when

[0206] △: 330 g / m 2 or more and less than 400 g / m 2 when

[0207] ×: less than 330 g / m 2 when

[0208] 5. Difficult to break

[0209] Regarding the difficulty of breaking of the sheet when wiping dirt with the kitchen paper towel sheet after production, a sensory evaluation is carried out by 20 monitors, and it is evaluated in five grades according to the number of people who feel the "sheet is easy to break". The evaluation criteria are as follows.

[0210] ◎: The number of people who feel the "sheet is easy to break" is 0 - 3

[0211] ○: The number of people who feel the "sheet is easy to break" is 4 - 7

[0212] △: The number of people who feel the "sheet is easy to break" is 8 - 10

[0213] ×: The number of people who feel the "sheet is easy to break" is 11 - 15

[0214] ××: The number of people who feel the "sheet is easy to break" is 16 or more

[0215] The conditions and evaluation results of each example are shown in Tables 1 and 2.

[0216] [Table 1]

[0217]

[0218] [Table 2]

[0219]

[0220] Based on the above, it is confirmed that according to this embodiment, a kitchen paper towel roll can be obtained which does not have an excessive grammage but remains within a certain range, and which has a soft touch while maintaining strength and water absorption, and also has a firm feeling.

[0221] Symbol Explanation

[0222] 1: Kitchen paper towel roll;

[0223] 1a: Surface;

[0224] 1b: Back;

[0225] 1e: The outermost peripheral edge of the kitchen paper towel roll;

[0226] 1x: Kitchen paper towel sheet;

[0227] 10: Test piece;

[0228] 10a, 10d: Corners;

[0229] 11: Belt;

[0230] 12: Bracket;

[0231] 20: Belt pressing part;

[0232] 21: Dehydration roller;

[0233] 22: Yankee dryer;

[0234] 23: Corrugated belt;

[0235] 24: Wet paper;

[0236] 100: Kitchen paper towel roll package;

[0237] 200: Packaging film.

Claims

1. A kitchen paper towel roll, characterized in that, the kitchen paper towel roll is obtained by bonding a sheet with an embossed pattern on one or both of two sheets using glue or water, and winding the kitchen paper towel sheets laminated in two layers into a roll shape. The grammage of one layer of the kitchen paper sheet is 16 g / m 2 or more and 27 g / m 2 or less. The tensile strength DMDT in the MD direction and the tensile strength DCDT in the CD direction of the kitchen paper towel sheet when dry, based on JIS P 8113, are both 600 gf / 25 mm or more and 1500 gf / 25 mm or less, and the ratio DMDT / DCDT of the DMDT to the DCDT is 0.3 or more and 2.5 or less. The bending resistance in both the MD direction and the CD direction of the kitchen paper towel sheet is 4.5 mN or more and 22.0 mN or less. The water absorption per unit area of the kitchen paper sheet is 330 g / m 2 or more and 600 g / m 2 or less.

2. The kitchen paper towel roll according to claim 1, characterized in that, The specific volume of the kitchen paper sheet is 7.6 cm 3 / g or more and 19.2 cm 3 / g or less.

3. The kitchen paper towel roll according to claim 1, characterized in that, the embossed pattern is linear. In the linear embossed pattern, the area occupied by embossings with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more is 4% or more and 50% or less of the area of the kitchen paper towel sheet.

4. The kitchen paper towel roll according to claim 1, characterized in that, the depth of the embossing in the embossed pattern is 0.06 mm or more and 1.05 mm or less.

5. The kitchen paper towel roll according to claim 1, characterized in that, the kitchen paper towel sheet has an uneven pattern from a papermaking process different from the embossed pattern.

6. The kitchen paper towel roll according to claim 1, characterized in that, the paper thickness of the kitchen paper towel sheet is 1.3 mm / 10 layers or more and 5.0 mm / 10 layers or less.

7. The kitchen paper towel roll according to claim 1, characterized in that, the roll diameter of the roll is 110 mm or more and 189 mm or less.

8. The kitchen paper towel roll according to claim 1, characterized in that, the elongation rate in the MD direction of the kitchen paper towel sheet based on JIS P 8113 is 6% or more and 15% or less.

9. The kitchen paper towel roll according to claim 1, characterized in that, the elongation rate in the CD direction of the kitchen paper towel sheet based on JIS P 8113 is 3% or more and 10% or less.

10. The kitchen paper towel roll according to claim 1, characterized in that, the roll softness of the roll is 1.2 mm or more and 4.0 mm or less.

11. The kitchen paper towel roll according to claim 1, characterized in that, the peel strength of the kitchen paper towel sheet is 0.03 N / 100 mm or more and 0.5 N / 100 mm or less.

12. The kitchen paper towel roll according to claim 1, characterized in that, the root mean square height of the surface roughness of the portion of the kitchen paper towel sheet where the embossed pattern is not given is 35 μm or more and 170 μm or less.

13. The kitchen paper towel roll according to claim 1, characterized in that, the kitchen paper towel sheet is wound around a paper tube. In the base paper used in the paper tube, the weight content ratio of LBKP (bleached softwood kraft pulp) is 50% or more and 100% or less.

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