Kitchen Towel Roll

Abstract

To provide a kitchen towel roll having excellent water absorption, that is not bulky, has no ply peeling and has low replacement frequency, even if a basis weight is not excessively increased but is within a prescribed region.SOLUTION: The kitchen towel roll is made by adhering a sheet imparted with a dotted embossment pattern using a glue, and taking up a kitchen towel sheet laminated in a 2-ply manner into a rolled state. The kitchen towel sheet has an irregular pattern derived from a paper-making process that is different from the embossment pattern. A basis weight of the 2-ply sheet is 32 g / m2 or more and 65 g / m2 or less, a paper thickness is 1.6 mm / 10 sheets or more and 4.7 mm / 10 sheets or less, a specific volume is 7 cm3 / g or more and 16 cm3 / g or less, a ply peel strength is 0.05 N / 75 mm or more and 2.0 N / 75 mm or less, an amount of water absorption per 1 m2 of the 2-ply sheet is 155 g or more and 520 g or less, and the amount of water absorption per 1 g is 4.3 g or more and 9.5 g or less.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In recent years, various kitchen towels have been developed. Water absorption and oil absorption of kitchen towels are important, and papermaking techniques for increasing water absorption and oil absorption have been developed. Also, techniques for reducing paper thickness by embossing patterns have been developed.

[0003] For example, Patent Document 1 discloses a kitchen towel and a method for manufacturing the same, which are made mainly of pulp, with one or more sheets stacked, a basis weight per set of 15 to 50 g / m 2 , and an oil absorption / basis weight of 4.5 to 7.5 OIL-g / g. When the length of the measurement field of view of the portion avoiding mechanical embossing in a process other than the papermaking machine is 1.0 - 1.4 mm, the height difference of surface unevenness is 100 to 600 μm, and the area ratio of the concave portions on the surface under the condition of a scan area of 10 cm × 10 cm is 2 to 12%. Further, Patent Document 2 discloses an embossing layer for embossing a wet fibrous web by pressing in a press portion of a tissue paper machine for manufacturing a high-bulk tissue paper. The embossing layer is non-woven, has a web conveying side with a surface cooperating with the fibrous web, and the surface has depressions or raised portions forming a three-dimensional structure thereon. A press portion and a paper machine for manufacturing a high-bulk crepe tissue paper web, and a manufacturing method thereof are also disclosed. Furthermore, Patent Document 3 discloses a method for manufacturing a roll-shaped paper product, which includes a step of preparing at least one paper web and a step of embossing at least one web using an embossed pattern that covers at least about 22% of the total surface area of at least one web. The pattern includes at least about 80% linear embossing, and the caliper of the finished product is smaller than the caliper of the embossed base sheet. A roll-shaped paper product and its manufacturing method are disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the water absorption capacity varies depending on the embossing pattern, and it was difficult to improve the water absorption capacity only with the above papermaking technology. In particular, when using a thick base paper obtained by the above papermaking technology, when embossing is applied in the same way as a normal base paper, it was found that the paper in the embossed part was crushed and the water absorption capacity decreased. That is, in the case of a normal base paper, it is common sense to emboss to increase the water absorption capacity and make it bulky. However, in the case of a papermaking technology that makes the base paper bulky, it was found that it is difficult to improve the water absorption capacity with a general concept of embossing.

[0006] Therefore, if the number of embossed parts is reduced, the ply peels off when absorbing water, and the paper tears or the wiping property deteriorates. That is, different from the case of a normal towel base paper, when using the base paper of the above papermaking technology, since the water absorption capacity increases, the ply peels off or the paper easily tears. In addition, when a pattern for reducing the paper thickness by embossing is used as in Patent Document 3, the water absorption may decrease. Of course, increasing the basis weight improves the water absorption, but the cost increases.

[0007] Therefore, the present invention has been made in view of the above problems, and provides a kitchen towel roll that has good water absorption, does not swell, does not peel off the ply, and has a low replacement frequency even under the condition that the basis weight is within a certain range without being excessively high.

Means for Solving the Problems

[0008] The inventors of the present invention conducted intensive research to solve the above problems. As a result, they found that by applying an uneven pattern different from the embossing pattern and adjusting the basis weight, paper thickness, specific volume, and specific parameters of the kitchen towel sheet, the above problems can be solved, and thus the present invention was completed. Specifically, the present invention provides the following.

[0009] (1) A first aspect of the present invention is a kitchen towel roll in which a sheet provided with a dot-like embossing pattern is adhesively treated with glue and laminated into two plies and wound into a roll, wherein the kitchen towel sheet has an uneven pattern derived from a papermaking process different from the embossing pattern, the basis weight of the two plies is 32 g / m 2 or more and 65 g / m 2 or less, the paper thickness is 1.6 mm / 10 sheets or more and 4.7 mm / 10 sheets or less, the specific volume is 7 cm 3 / g or more and 16 cm 3 / g or less, the ply peel strength is 0.05 N / 75 mm or more and 2.0 N / 75 mm or less, the water absorption per 1 m 2 of the two plies is 155 g or more and 520 g or less, and the water absorption per gram is 4.3 g or more and 9.5 g or less, the water absorption per 1 m 2 between the two plies is 63 g or more and 250 g or less, and the winding length of the kitchen towel roll is 15 m or more and 40 m or less, and the winding diameter is 113 mm or more and 180 mm or less.

[0010] (2) The second aspect of the present invention is the kitchen towel roll according to (1), wherein the ratio of the depth of the emboss in the emboss pattern to the paper thickness of the entire kitchen towel sheet is 0.05 or more and 0.30 or less.

[0011] (3) The third aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein in the emboss pattern, the area of the emboss is 1 mm 2 or more and 40 mm 2 or less, and the number of embosses per 100 cm 2 of the unit area is 20 or more and 1800 or less.

[0012] (4) The fourth aspect of the present invention is the kitchen towel roll according to any one of (1) to (3), wherein in the emboss pattern, the depth of the emboss with an area of 1 mm 2 or more and 40 mm 2 or less is 0.07 mm or more and 0.80 mm or less.

[0013] (5) The fifth aspect of the present invention is the kitchen towel roll according to any one of (1) to (4), wherein the roll density is 0.03 g / cm 3 or more and 0.15 g / cm 3 or less.

[0014] (6) The sixth aspect of the present invention is the kitchen towel roll according to any one of (1) to (5), wherein the winding density is 0.11 m / cm 2 or more and 0.65 m / cm 2 or less. [Advantages of the Invention]

[0015] Therefore, according to the present invention, it is possible to provide a kitchen towel roll that has good water absorption, does not swell, does not cause ply separation, and has a low replacement frequency even under conditions where the basis weight is not excessively high but is within a certain range.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail. However, the following embodiments are presented for illustrative purposes only, and the present invention is not limited to the embodiments shown below.

[0018] <Kitchen Towel Roll> FIG. 1 is a perspective view showing the appearance of the kitchen towel roll 1 of the present invention. The kitchen towel roll 1 of the present invention is a kitchen towel roll 1 in which a kitchen towel sheet 1x obtained by adhesively treating a sheet provided with a dot-like emboss pattern with glue and laminating it into 2 plies is wound into a roll shape. It is preferable that the kitchen towel sheet 1x is perforated at equal intervals.

[0019] Also, as shown in FIG. 1, among the surfaces of the kitchen towel sheet 1x, the surface directed to the outside of the roll is referred to as surface 1a (the surface of the kitchen towel sheet 1x), and the surface directed to the center of the roll is referred to as back surface 1b (the back surface of the kitchen towel sheet 1x).

[0020] (Roll length and roll diameter) The roll length of the kitchen towel roll 1 is 15 m or more and 40 m or less. Also, the roll diameter DR of the kitchen towel roll 1 is 113 mm or more and 180 mm or less. If the roll length is less than 15 m, the replacement frequency will be high, and if the roll length exceeds 40 m, it will be bulky. If the roll diameter DR is less than 113 mm, the water absorption will be poor or the replacement frequency will be high, and if the roll diameter DR exceeds 180 mm, it will be bulky or the roll density will be low, and it is difficult to improve the water absorption despite being bulky.

[0021] Incidentally, the roll length is preferably 21 m or more and 35 m or less, and more preferably 25 m or more and 31 m or less. The roll diameter DR is preferably 135 mm or more and 170 mm or less, and more preferably 140 mm or more and 160 mm or less. For the roll length, for the kitchen towel sheet 1x between the perforations of the kitchen towel roll 1, the length of 10 sheets is actually measured. Then, the number of sheets of the kitchen towel roll 1 is actually measured, and the roll length is obtained by proportional calculation from the length of 10 sheets and the number of sheets. For example, when the length of 10 sheets is 1.80 m and the number of sheets is 150 sheets, it becomes 1.80 m × (150 / 10) = 27 m. Incidentally, when there are no perforations in the kitchen towel roll 1, the roll length can be measured by actual measurement. Also, the roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed on 10 kitchen towel rolls 1, and the measurement results are averaged. In addition, the length between the perforations (the length of the sheet in the flow direction) is preferably 100 mm or more and 300 mm or less, more preferably 130 mm or more and 280 mm or less, and even more preferably 160 mm or more and 250 mm or less. By setting it within this range, when using the kitchen towel roll 1 with good water absorption as in the present application, the area to be used becomes appropriate, and the water absorption amount can be improved.

[0022] (Roll width and roll mass) The roll width of the kitchen towel roll 1 is preferably 150 mm or more and 380 mm or less, more preferably 200 mm or more and 350 mm or less, and even more preferably 250 mm or more and 300 mm or less. By setting it within this range, when using the kitchen towel roll 1 with good water absorption as in the present application, the area to be used becomes appropriate, and the water absorption amount can be improved. In addition, the roll mass of the kitchen towel roll 1 is preferably 210 g or more and 570 g or less, more preferably 290 g or more and 500 g or less, and even more preferably 320 g or more and 420 g or less. By setting it within this range, when using the kitchen towel roll 1 with good water absorption as in the present application, the replacement frequency can be improved without being bulky. Note that the roll mass is the mass per 280 mm of the roll width excluding the core (paper tube). When the roll width is not 280 mm, it is converted to the mass per 280 mm by proportional calculation.

[0023] (Roll density and winding density) The roll density of the kitchen towel roll 1 is preferably 0.03 g / cm 3 or more and 0.15 g / cm 3 or less, and the winding density is 0.11 m / cm 2 or more and 0.65 m / cm 2 or less. If the roll density of the kitchen towel roll 1 is less than 0.03 g / cm 3 or the winding density is less than 0.11 m / cm 2 it becomes difficult to improve the water absorption amount despite the kitchen towel roll 1 being bulky. Also, if the roll density of the kitchen towel roll 1 is 0.15 g / cm3 exceeds, or if the winding density exceeds 0.65 m / cm 2 the paper thickness and specific volume will be low, and the water absorption will be poor. In addition, the roll density of the kitchen towel roll 1 is 0.05 g / cm 3 or more and 0.11 g / cm 3 or less, preferably 0.07 g / cm 3 or more and 0.10 g / cm 3 or less is more preferable. The winding density of the kitchen towel roll 1 is 0.23 m / cm 2 or more and 0.51 m / cm 2 or less is more preferable, and 0.28 m / cm 2 or more and 0.40 m / cm 2 or less is even more preferable.

[0024] 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 outer diameter (winding diameter DR) part of the roll - cross-sectional area of the outer diameter part of the core (paper tube)}. The core outer diameter DI is the diameter of the central hole of the roll. For example, when the winding length is 27 m, the number of plies is 2, the winding diameter DR is 150 mm, and the core outer diameter DI 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 will result. When there is no core in the kitchen towel roll 1, the diameter of the central hole is taken as the core outer diameter DI. In addition, the roll density is expressed as (roll mass) ÷ (volume of the roll). The roll mass is the mass of the kitchen towel roll 1 per 280 mm of the roll width. The roll volume is expressed as [{cross-sectional area of the outer diameter (winding diameter DR) part of the roll} - (cross-sectional area of the core outer diameter part)] × roll width (converted per 280 mm). For example, when the roll mass (excluding the core) per 280 mm of the roll width is 382 g, the winding diameter is 150 mm, and the outer diameter of the core is 39 mm, the roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 - 3.14 × (39 mm ÷ 2 ÷ 10) 2} × (280 mm ÷ 10)] = 0.083 g / cm3 This becomes the case. When the kitchen towel roll 1 has no core, the diameter of the center hole is taken as the core outer diameter DI.

[0025] (Grammage per square meter) The grammage per square meter of the two-ply kitchen towel sheet 1x is 32 g / m 2 or more and 65 g / m 2 or less. If the grammage per square meter of the two-ply is less than 32 g / m 2 , the water absorption of the kitchen towel sheet 1x will be inferior. If the grammage per square meter exceeds 65 g / m 2 , the production cost of the kitchen towel roll 1 will increase. The grammage per square meter of the two-ply kitchen towel sheet 1x is preferably 36 g / m 2 or more and 60 g / m 2 or less, and more preferably 40 g / m 2 or more and 53 g / m 2 or less. The grammage per square meter is measured based on JIS P 8124.

[0026] Also, the grammage per square meter per ply of the kitchen towel sheet 1x is preferably 15 g / m 2 or more and 33 g / m 2 or less for both the front surface 1a and the back surface 1b, more preferably 17 g / m 2 or more and 30 g / m 2 or less, and even more preferably 20 g / m 2 or more and 27 g / m 2 or less. The grammage per square meter per ply is calculated by measuring the grammage per square meter of the two-ply, then peeling off the ply, measuring the masses of the front surface 1a and the back surface 1b, and calculating the grammage per square meter of the front surface 1a and the back surface 1b from the mass ratio. Furthermore, in the kitchen towel sheet 1x, the grammage per square meter of the back surface 1b is preferably 0.3 g / m 2 or more and 2.0 g / m 2 or less higher than that of the front surface 1a. Since the front surface 1a has an embossed pattern described later, it is likely to have inferior water absorption compared to the back surface 1b. By increasing the grammage per square meter of the back surface 1b, the water absorption of the back surface 1b can be increased, and thereby the overall water absorption can be increased. The grammage per square meter of the back surface 1b is 0.3 g / m 2 or more and 1.5 g / m2 Higher is more preferable, 0.3 g / m 2 or more and 1.0 g / m 2 or less, and higher is even more preferable.

[0027] (Paper thickness) Also, the paper thickness of the kitchen towel sheet 1x is 1.6 mm / 10 sheets or more and 4.7 mm / 10 sheets or less. If the paper thickness is less than 1.6 mm / 10 sheets, the water absorption of the kitchen towel sheet 1x is inferior. If it exceeds 4.7 mm / 10 sheets, it is difficult to improve the water absorption despite being bulky. The paper thickness of the kitchen towel sheet 1x is preferably 1.9 mm / 10 sheets or more and 3.7 mm / 10 sheets or less, and more preferably 2.2 mm / 10 sheets or more and 3.1 mm / 10 sheets or less. The paper thickness is measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a measuring head diameter of 30 mm. A sample is placed between the measuring head and the measuring table, and the gauge is read when the measuring head is lowered at a speed of 1 mm or less per second. Five sets of the kitchen towel sheet 1x laminated in two-ply are stacked and measured as 10 sheets. Also, the measurement is repeated 10 times and the measurement results are averaged.

[0028] (Emboss pattern) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an emboss pattern. Also, in the kitchen towel sheet 1x of the present invention, after embossing the sheet, it is laminated into two-ply. When laminating into two-ply, a ply bond glue (adhesive) is used, and the glue is applied for adhesion treatment. By adhering in this way to make it two-ply, the adhesion between the plies becomes stronger, and the kitchen towel sheet 1x is less likely to peel between the plies and is less likely to tear even when wet with water.

[0029] On the ply of the surface 1a of the kitchen towel sheet 1x, a dot-shaped embossed pattern is provided. By providing the dot-shaped embossed pattern on the surface 1a, glue can be applied to the embossed portion of the embossed pattern for adhesion treatment, making it less likely for the ply of the kitchen towel sheet 1x to peel off and allowing the water absorption to be within a certain range. In the embossed pattern, the size is 1 mm 2 or more and 40 mm 2 or less, and the number of embosses per unit area of 100 cm 2 is preferably 20 or more and 1800 or less. If the number of embosses is less than 20, in the case of the kitchen towel sheet 1x with good water absorption as in the present application, the plies are likely to peel off. If the number of embosses exceeds 1800, the paper of the kitchen towel sheet 1x is crushed and the water absorption is inferior. In addition, the size is 1 mm 2 or more and 40 mm 2 or less, and the number of embosses per unit area of 100 cm 2 is more preferably 50 or more and 1000 or less, and even more preferably 80 or more and 500 or less. Also, the shape of each emboss can be used without particular limitation, such as circular, oval, rectangular, square, floral pattern, etc.

[0030] Also, in the embossed pattern, the size is 1 mm 2 or more and 40 mm 2 or less, and the depth of the emboss is preferably 0.07 mm or more and 0.80 mm or less. If the depth of the emboss is less than 0.07 mm, the water absorption per 1 m 2 between the two plies of the kitchen towel sheet 1x becomes low and the water absorption is inferior as a whole. If the depth exceeds 0.80 mm, the specific volume of the kitchen towel sheet 1x becomes high and it is difficult to improve the water absorption despite being bulky. In addition, the depth of the emboss with a size of 1 mm 2 or more and 40 mm 2 or less is more preferably 0.25 mm or more and 0.67 mm or less, and even more preferably 0.35 mm or more and 0.55 mm or less. The area and depth of the emboss are measured using a microscope. As the microscope, the product named "One Shot 3D Measurement Macroscope VR-3100" manufactured by KEYENCE Corporation can be used. As the image observation, measurement, and image analysis software of the microscope, the product named "VR-H1A" can be used. Also, the measurement conditions are to measure under the conditions of a magnification of 12 times and a field area of 24 mm × 18 mm. The measurement magnification and field area may be appropriately changed depending on the size of the emboss to be obtained.

[0031] Note that as shown in FIG. 2, for the area of the emboss, the length a of the longest part of the periphery fr of the emboss and the length b of the longest part in the direction perpendicular to the length a are measured, and a × b is obtained as the area. Also, FIG. 3 shows the height profile on the X-Y plane by the microscope, and the height of the sheet surface is represented by shading. The substantially elliptical part where the shading in FIG. 3 is different from the periphery indicates individual embosses, and the length a of the longest part of one of the embosses can be visually distinguished. Among them, for embosses with an area of 1 mm 2 or more and 40 mm 2 or less, the number per 100 cm 2 is counted. For the measurement of the number of embosses, from the entire area between two adjacent perforations in the length direction across the entire width of the sheet, an arbitrary 100 cm 2 part is selected and measured visually. Note that if a 100 cm 2 part cannot be selected, such as when nailing (edge emboss) processing is performed, the number of embosses is measured for the measurable parts excluding the parts that cannot be measured by nailing (edge emboss) processing or the like, and converted as the number of embosses per 100 cm 2 .

[0032] Next, for embosses with an area of 1 mm 2 or more and 40 mm 2 or less, the depth of the emboss is measured. The depth of the emboss is obtained by measuring the height difference of the above-mentioned emboss using the above microscope. First, draw line segment AB as shown in FIG. 3 to obtain the height profile in FIG. 4. Note that line segment AB may be drawn so as to cross the emboss. The height profile is a (measured) cross-sectional curve S representing the unevenness of the actual sample surface of the sheet, but it also includes noise (such as fiber lumps on the sheet surface, fibers extending in a whisker shape, or sharp peaks caused by fiber-free parts). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks. Therefore, as shown in FIG. 5, calculate the "contour curve" W from the cross-sectional curve S of the height profile. Among this contour curve W, obtain the average value of the bottoms P1 and P2 and the difference between the top sandwiched between the bottoms P1 and P2, and define this as the depth D1 of the emboss. Similarly, obtain the average value of the bottoms P2 and P3 and the difference between the top sandwiched between the bottoms P2 and P3, and define this as the depth D2 of the emboss. Similarly, measure D3. Note that D1, D2, and D3 are measured at continuous locations as shown in FIG. 5. This measurement is performed at 10 locations on the kitchen towel sheet, and the average value of the data at a total of 30 locations is defined as the depth of the emboss. When the distance between the embosses (the distance between P1 and P2) is more than 1 cm apart, instead of measuring at continuous locations, obtain the average value of the bottoms P1 and P2 and the difference between the top sandwiched between the bottoms P1 and P2, define this as the depth D1 of the emboss, measure D1 30 times, and the average value may be defined as the emboss depth.

[0033] Note that the "contour curve" is a curve obtained by removing the surface roughness component with a shorter wavelength than λc: 800 μm (where λc is the "filter defining the boundary between the roughness component and the waviness component" described in JIS B 0601 "3.1.1.2") from the cross-sectional curve by a low-pass filter. Note that if λc is set to be greater than or equal to the distance between adjacent embosses P1 and P2, P2 and P3 (this is called the emboss pitch), there is a possibility that the peak will be recognized as noise, so λc is set to be less than the emboss pitch. For example, when the emboss pitch is 800 μm or less, for example, set λc: 250 μm. When measuring the embossment, the measurement surface shall be the surface 1a side. Also, when selecting the embossment, measure at a portion corresponding to 10% of the winding length of the kitchen towel roll 1 starting from the outer wound end of the kitchen towel roll 1 (the position where the use of the kitchen towel sheet 1x begins). For example, when the winding length is 30 m, measure at a portion 30 m × 10% = 3 m from the end. In addition, when the 10% portion of the winding length hits the perforation, measure the outer wound side of the perforation.

[0034] Furthermore, the ratio of the depth of the embossment in the embossment pattern to the paper thickness of the entire kitchen towel sheet 1x, i.e., the ratio of the depth of the embossment in the embossment pattern / the paper thickness of the entire kitchen towel sheet 1x, is preferably 0.05 or more and 0.30 or less. If the ratio is less than 0.05, the water absorption per 1 m between the two plies of the kitchen towel sheet 1x becomes low, the overall water absorption is inferior, and the plies are likely to peel off. If the ratio exceeds 0.30, it becomes difficult to improve the water absorption despite the bulkiness. The ratio of the depth of the embossment in the embossment pattern / the paper thickness of the entire kitchen towel sheet 1x is more preferably 0.08 or more and 0.25 or less, and even more preferably 0.10 or more and 0.23 or less. 2 When the ratio is less than 0.05, the water absorption per 1 m between the two plies of the kitchen towel sheet 1x becomes low, the overall water absorption is inferior, and the plies are likely to peel off. If the ratio exceeds 0.30, it becomes difficult to improve the water absorption despite the bulkiness. The ratio of the depth of the embossment in the embossment pattern / the paper thickness of the entire kitchen towel sheet 1x is more preferably 0.08 or more and 0.25 or less, and even more preferably 0.10 or more and 0.23 or less.

[0035] The ply on the back surface 1b of the kitchen towel sheet 1x is not particularly limited regarding whether an embossment pattern is applied as long as it has an uneven pattern derived from a papermaking process different from the embossment pattern. Whether nested embossment or pin-to-pin embossment is applied, or no embossment is applied, it does not matter, but preferably nested embossment or no embossment, more preferably no embossment.

[0036] (Water absorption) In the present invention, the water absorption per 1 m of two plies of the kitchen towel sheet 1x 2 is 155 g or more and 520 g or less. If the water absorption per 1 m 2 is less than 155 g, the water absorption of the kitchen towel sheet 1x is inferior, and if it exceeds 520 g, the paper thickness of the kitchen towel sheet 1x becomes high and bulky. In addition, per 1 m2 The water absorption per unit area is preferably 180 g or more and 400 g or less, and more preferably 200 g or more and 260 g or less. In addition, the water absorption per gram of the 2-ply of the kitchen towel sheet 1x is 4.3 g or more and 9.5 g or less. If the water absorption per gram is less than 4.3 g, the water absorption of the kitchen towel sheet 1x is inferior. If it exceeds 9.5 g, the paper thickness of the kitchen towel sheet 1x becomes thick and bulky, and it becomes difficult to improve the water absorption for the bulkiness. The water absorption per gram is preferably 4.5 g or more and 9.0 g or less, and more preferably 4.6 g or more and 6.0 g or less.

[0037] Furthermore, for the 2-ply of the kitchen towel sheet 1x, the water absorption per 1 m 2 is 63 g or more and 250 g or less. If the water absorption per 1 m between the 2 plies 2 is less than 63 g, the water absorption of the kitchen towel sheet 1x is inferior. If it exceeds 250 g, the paper thickness of the kitchen towel sheet 1x becomes high and bulky, and it becomes difficult to improve the water absorption for the bulkiness. At this time, for the 2-ply, the water absorption per 1 m 2 The water absorption per unit length is for 1 m of the 2-ply 2 The water absorption per unit length is from the water absorption per 1 m of the 2-ply, minus the water absorption per 1 m of the single ply (the front surface 1a) described later 2 and the water absorption per 1 m of the single ply (the back surface 1b). 2 It is the value obtained by subtracting. Note that for the 2-ply, the water absorption per 1 m 2 is preferably 75 g or more and 200 g or less, and more preferably 80 g or more and 120 g or less. The water absorption of each part of the kitchen towel sheet 1x is measured as follows.

[0038] First, collect the kitchen towel sheet 1x stacked in 2 plies, cut it using a template with a square of 7.6 cm (3 inches) on one side to produce a test piece in the shape of a rectangle with a side of 7.6 cm. Measure the mass of the test piece before water absorption with an electronic balance. Set the test piece in a holder (a jig that fixes three points of the test piece, and the jig is made of a metal that does not absorb moisture). Next, pour 2 cm of distilled water into a commercially available bat, and immerse the test piece set in the holder in the distilled water for 2 minutes. After 2 minutes of immersion, take out the test piece together with the holder from the distilled water, and attach a strip 210 to one corner 200d of the test piece 200 as shown in FIG. 6. The strip 210 is cut from the same kitchen towel sheet 1x as the sample to be measured into a size of 2 mm in width × 15 mm in length, the ply is peeled off, and the back ply is used to attach it to a portion 6 mm from the corner 200d of the test piece toward the center. Next, the holder and the test piece 200 are hung on a rod installed in an empty water tank with the corner 200a facing the corner 200d upward, the lid of the water tank is closed, and left for 10 minutes. Then, take out the holder 220 and the test piece 200 from the water tank, remove the strip 210 and the holder 220, and measure the mass of the test piece 200 with an electronic balance. From the mass change of the test piece 200 before and after immersion in distilled water, the water absorption amount of distilled water per 1 m 2 of the test piece (g of water / m of paper 2 ) is calculated. Further, by dividing the water absorption amount per 1 m 2 (g of water / m of paper 2 ) by the basis weight of 2 plies of the test piece, the water absorption amount per 1 m 2 (g of water / m of paper 2 ) / basis weight (g of paper / m of paper 2 ) = water absorption amount per 1 g (g of water / g of paper) is calculated. The measurement is performed 5 times for each sample, and the average value is adopted. For the water absorption amount of 1 ply, cut the kitchen towel sheet 1x with 2 plies stacked using a template in the shape of a square with one side being 7.6 cm (3 inches) to obtain a test piece in the shape of a rectangle with one side being 7.6 cm. Then, peel off the ply and use this as a test piece for measuring the water absorption amount of 1 ply. The measurement method is the same as that for 2 plies. In addition, this measurement is performed according to JIS P 8111 method under the conditions of a temperature of 23 ± 1 °C and a humidity of 50 ± 2%. Also, the distilled water is maintained at 23 ± 1 °C.

[0039] In the present invention, for 1 m of 1 ply (surface 1a) of the kitchen towel sheet 1x 2The water absorption per unit area is preferably 45 g or more and 145 g or less, more preferably 55 g or more and 105 g or less, and still more preferably 65 g or more and 85 g or less. On the other hand, for 1 ply (back surface 1b) of the kitchen towel sheet 1x, 1 m 2 The water absorption per unit area is preferably 45 g or more and 155 g or less, more preferably 55 g or more and 110 g or less, and still more preferably 65 g or more and 90 g or less. In addition, the water absorption per gram of 1 ply (front surface 1a) of the kitchen towel sheet 1x is preferably 2.5 g or more and 5.0 g or less, more preferably 2.6 g or more and 4.9 g or less, and still more preferably 2.7 g or more and 4.0 g or less. On the other hand, the water absorption per gram of 1 ply (back surface 1b) of the kitchen towel sheet 1x is preferably 2.6 g or more and 5.1 g or less, more preferably 2.7 g or more and 5.0 g or less, and still more preferably 2.8 g or more and 4.1 g or less.

[0040] (Core outer diameter) In addition, the core outer diameter DI, which is the outer diameter of the core of the kitchen towel roll 1 of the present invention, is preferably 25 mm or more and 55 mm or less, more preferably 30 mm or more and 50 mm or less, and still more preferably 35 mm or more and 45 mm or less. When the core outer diameter DI is within the above range, while suitably maintaining the winding density of the kitchen towel roll 1, the kitchen towel roll 1 does not take up much space, so that it can be easily accommodated in a kitchen towel holder. In addition, the handleability of the kitchen towel roll 1 during manufacturing also becomes good. The core outer diameter was measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement was performed on 10 kitchen towel rolls 1, and the measurement results were averaged. Furthermore, the mass of the core (paper tube) per 280 mm of the roll width is preferably 5 g or more and 17 g or less, more preferably 7 g or more and 15 g or less, and still more preferably 9 g or more and 13 g or less.

[0041] (Specific volume) The specific volume of the kitchen towel sheet 1x is 7 cm3 16 cm or more per g 3 and 7 cm or less per g. If the specific volume of the kitchen towel sheet 1x is less than 7 cm 3 / g, the water absorption of the kitchen towel sheet 1x is inferior, and if it exceeds 16 cm 3 / g, it is difficult to improve the water absorption despite bulkiness. The specific volume is preferably 14 cm 3 or more and 8 cm 3 / g or less, more preferably 13 cm 3 or more and 9 cm 3 / g or less. The specific volume is obtained by dividing the paper thickness per 2 plies of the kitchen towel sheet 1x by the basis weight per 2 plies, and is expressed as the volume in cm per unit g 3 .

[0042] (DMDT and DCDT) The dry machine direction tensile strength DMDT (Dry Machine Direction Tensile Strength) of 2 plies of the kitchen towel sheet 1x based on JIS P 8113 is preferably 5 N / 25 mm or more and 24 N / 25 mm or less, and the dry cross direction tensile strength DCDT (Dry Cross Direction Tensile Strength) is preferably 3 N / 25 mm or more and 19 N / 25 mm or less. If DMDT is less than 5 N / 25 mm or DCDT is less than 3 N / 25 mm, the kitchen towel sheet 1x is likely to tear when absorbing water. If DMDT exceeds 24 N / 25 mm or DCDT exceeds 19 N / 25 mm, the density of the kitchen towel sheet 1x becomes high and the water absorption is inferior. Incidentally, DMDT is more preferably 8 N / 25 mm or more and 19 N / 25 mm or less, and even more preferably 10 N / 25 mm or more and 16 N / 25 mm or less. Also, DCDT is more preferably 5 N / 25 mm or more and 14 N / 25 mm or less, and even more preferably 6 N / 25 mm or more and 12 N / 25 mm or less.

[0043] (WMDT and WCDT) Also, it is preferable that the wet machine direction tensile strength WMDT (Wet Machine Direction Tensile Strength) of the two-ply kitchen towel sheet 1x based on the old JIS S 3104 is 1.3 N / 25 mm or more and 7.0 N / 25 mm or less, and it is preferable that the wet cross direction tensile strength WCDT (Wet Cross Direction Tensile Strength) is 0.7 N / 25 mm or more and 5.5 N / 25 mm or less. If the WMDT is less than 1.3 N / 25 mm or the WCDT is less than 0.7 N / 25 mm, the kitchen towel sheet 1x is likely to tear when absorbing water. If the WMDT exceeds 7.0 N / 25 mm or the WCDT exceeds 5.5 N / 25 mm, the density of the kitchen towel sheet 1x will be high and its water absorption will be poor. In addition, it is more preferable that the WMDT is 2.0 N / 25 mm or more and 6.0 N / 25 mm or less, and it is even more preferable that it is 2.5 N / 25 mm or more and 5.0 N / 25 mm or less. Also, it is more preferable that the WCDT is 1.0 N / 25 mm or more and 4.0 N / 25 mm or less, and it is even more preferable that it is 1.8 N / 25 mm or more and 3.5 N / 25 mm or less.

[0044] (Ply peel strength) The ply peel strength of the kitchen towel sheet 1x is 0.05 N / 75 mm or more and 2.0 N / 75 mm or less. If the ply peel strength is less than 0.05 N / 75 mm, the plies will peel off and it will be difficult to wipe. If the ply peel strength exceeds 2.0 N / 75 mm, the water absorption of the kitchen towel sheet 1x will be poor. In addition, it is preferable that the ply peel strength of the kitchen towel sheet 1x is 0.10 N / 75 mm or more and 1.5 N / 75 mm or less, and it is more preferable that it is 0.15 N / 75 mm or more and 1.0 N / 75 mm or less. The method for measuring the ply peeling strength can be carried out using a tensile testing machine (STB-1225S, manufactured by A&D Company, Ltd.) in accordance with the tensile testing method of JIS P 8113 under the standard conditions specified in JIS P 8111. First, a test piece with a width of 75 mm in the width direction and a length of 200 mm in the flow direction is taken from the sample of the kitchen towel roll 1. Next, the ply is peeled 35 mm in the flow direction. One side of the peeled ply is fixed by clamping it with the upper gripper (width 75 mm) for 15 mm in the flow direction. Also, the other ply is fixed by clamping it with the lower gripper (width 75 mm) for 15 mm in the flow direction. Note that the pitch (spacing) of the grippers is 20 mm. Next, the ply is pulled (peeled) under the condition of a pulling speed of 100 mm / min, and the strength data is collected. The data is acquired every 20 μm, and the data from a distance of 40 mm to 150 mm after the start of measurement (measurement length 110 mm) is averaged and taken as the peeling strength (N / 75 mm). However, if the perforation is included from a distance of 40 mm to 150 mm after the start of measurement, the distance after the start of measurement can be shortened to a range without perforation, for example, from 40 mm to 90 mm (measurement length 50 mm).

[0045] (Method for 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 order of (1) papermaking and creping, (2) embossing, and (3) roll winding. In the manufacturing process, it is preferable not to use through-air dryer technology. At this time, in the papermaking process, a pattern of unevenness derived from the papermaking process different from the above-mentioned embossing pattern is applied to the kitchen towel sheet 1x. By having this pattern of unevenness, the water absorption capacity of the kitchen towel sheet 1x becomes even higher. Note that being derived from the papermaking process means being applied between the head box of the paper machine and the inlet of the Yankee dryer in the papermaking process of the kitchen towel sheet 1x. Specifically, in a part of the papermaking process shown in FIG. 7, unevenness can be imparted by the belt press section 30 disposed between the dehydration roll 31 and the Yankee dryer 32. In the belt press section 30, the wet paper 34 and the uneven belt 33 (the uneven belt 33 loops around the belt press section 30 and the Yankee dryer 32) are pressed together to impart a pattern of unevenness to the wet paper. Also, the pattern of unevenness can be appropriately changed by changing the pattern of the belt (fine pattern, rough pattern). When the pattern of unevenness is changed, the specific volume (paper thickness) changes, but it is preferable to select a pattern such that the specific volume (paper thickness) of the base paper falls within the numerical range described later.

[0046] At this time, the basis weight of 2-ply of the base paper used for manufacturing the kitchen towel sheet 1x is preferably 33 g / m 2 or more and 68 g / m 2 or less, more preferably 39 g / m 2 or more and 63 g / m 2 or less, and even more preferably 47 g / m 2 or more and 55 g / m 2 or less. Also, the paper thickness is preferably 1.3 mm / 10 sheets or more and 4.5 mm / 10 sheets or less, more preferably 1.7 mm / 10 sheets or more and 3.5 mm / 10 sheets or less, and even more preferably 2.0 mm / 10 sheets or more and 3.0 mm / 10 sheets or less. Further, the specific volume is 6 cm 3 / g or more and 16 cm 3It is preferably below / g and 7 cm 3 / g or more and 15 cm 3 It is more preferably below / g and 9 cm 3 / g or more and 13 cm 3 It is even more preferably below / g. In addition, the ratio of the depth of the embossing in the embossing pattern to the paper thickness of the base paper of the kitchen towel sheet 1x, that is, the ratio of the depth of the embossing in the embossing pattern / the paper thickness of the base paper of the kitchen towel sheet 1x is preferably 0.05 or more and 0.40 or less, more preferably 0.08 or more and 0.32 or less, and even more preferably 0.10 or more and 0.27 or less. By setting it within this range, in the case of a kitchen towel sheet with good water absorption as in the present application, it is not bulky and is difficult to peel off during peeling, and the water absorption can be improved. Also, the paper thickness of the kitchen towel sheet 1x is preferably higher than the paper thickness of the base paper in order to improve water absorption, and the specific volume of the kitchen towel sheet 1x is preferably higher than the specific volume of the base paper in order to improve water absorption.

[0047] The present invention is not limited to the above-described embodiments, and it goes without saying that it extends to various modifications and equivalents included in the spirit and scope of the present invention.

Examples

[0048] (1) Through the steps of papermaking, creping, (2) embossing, and (3) roll winding, kitchen towel sheets and kitchen towel rolls of Examples 1 to 26 and Comparative Examples 1 to 14 were manufactured. Also, two types of commercially available kitchen towel sheets and kitchen towel rolls were prepared. For all of the above examples, comparative examples, and commercially available kitchen towel rolls, the above-mentioned parameters were measured and a sensory evaluation was conducted. The sensory evaluation was conducted by 30 people. The kitchen towel sheet and the kitchen towel roll were actually used, and the following items were evaluated as particularly excellent: 5 points, excellent: 4 points, good: 3 points, inferior: 2 points, particularly inferior: 1 point. Basis weight: The evaluation was made by actual measurement. Water absorption: The water absorption when wiping water was evaluated. Non-bulky: From the viewpoints of paper thickness, roll diameter, roll density, and reel density, it was evaluated whether it is non-bulky. Replacement frequency: The roll length was actually measured for evaluation. Wiping property: When wiping while absorbing water, it was evaluated whether the ply peels off and makes it difficult to use.

[0049] The obtained results are shown in Tables 1 to 3.

[0050]

Table 1

[0051]

Table 2

[0052]

Table 3

[0053] From the above, it can be seen that the kitchen towel roll of the present invention has good water absorption, is non-bulky, does not have ply peeling, and has a low replacement frequency even under the condition of setting the basis weight within a certain range without excessively increasing it.

Explanation of Signs

[0054] 1 Kitchen towel roll 1a Surface 1b Back surface 1e Edge of the outermost roll of the kitchen towel sheet 1x Kitchen towel sheet 30 Belt press section 31 Dehydration roll 32 Yankee dryer 33 Embossed belt 34 Wet paper 200 Test piece 200a, 200d Corners 210 Band 220 Holder

Claims

1. A kitchen towel roll obtained by adhesively bonding sheets with dot-shaped embossed patterns in a group and winding the laminated two-ply kitchen towel sheets in a roll, wherein the kitchen towel sheets have a concavo-convex pattern derived from a papermaking process different from the embossed pattern, the embossed pattern is formed on the concavo-convex pattern derived from the papermaking process, and the ratio of the depth of the emboss in the embossed pattern to the paper thickness of the entire kitchen towel sheet is 0.05 or more and 0.30 or less, The basis weight of the two-ply is 32 g / m ２ or more and 65 g / m ２ or less, the paper thickness is 1.6 mm / 10 sheets or more and 4.7 mm / 10 sheets or less, and the specific volume is 7 cm ３ / g or more and 16 cm ３ / g or less, and the ply peel strength is 0.05 N / 75 mm or more and 2.0 N / 75 mm or less, The water absorption per square meter of two-ply is 155 g or more and 520 g or less, and the water absorption per gram is 4.3 g or more and 9.5 g or less. The water absorption per square meter between two-ply is 63 g or more and 250 g or less. ２ ​ the kitchen towel roll is characterized in that the winding length is 15 m or more and 40 m or less, and the winding diameter is 113 mm or more and 180 mm or less.

2. In the embossed pattern, the area of the emboss is 1 mm ２ or more and 40 mm ２ or less, and the number per 100 cm ２ of the emboss is 20 or more and 1800 or less. The kitchen towel roll according to claim 1, characterized in that.

3. In the embossed pattern, the depth of the emboss having an area of 1 mm ２ or more and 40 mm ２ or less is 0.07 mm or more and 0.80 mm or less, and the kitchen towel roll according to claim 1 or 2 is characterized thereby.

4. The roll density is 0.03 g / cm ３ or more and 0.15 g / cm ３ or less, and the kitchen towel roll according to any one of claims 1 to 3, characterized in that.

5. The roll density is 0.11 m / cm ２ or more and 0.65 m / cm ２ The kitchen towel roll according to any one of claims 1 to 4, characterized in that it is as described above.

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