Kitchen towel roll and method for manufacturing kitchen towel roll

Abstract

To provide a kitchen towel roll that keeps a soft feeling while maintaining a basis weight of a sheet, has excellent water absorption, and is less likely to be worn, and to provide a method for manufacturing the kitchen towel roll.SOLUTION: A kitchen towel roll is made of a kitchen towel sheet that is made by laminating two or three plies of sheets in which an embossed pattern is imparted to at least one of the plies and wound the kitchen towel sheet into a roll state, where a basis weight per product ply of the kitchen towel sheet is 30 g / m2 or more and 56 g / m2 or less, a speed of water absorption (0.1 mL) is 1.5 second / 0.1 m or less, GMT of the kitchen towel sheet that represents a square root of a product of DMDT and DCDT is 6 N / 25 mm or more and 17 N / 25 mm or less, and a value (GMT / product basis weight) obtained by dividing GMT by the basis weight per product ply is 0.13 or more and 0.40 or less. A method for manufacturing a kitchen towel is also disclosed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a 2-ply or 3-ply kitchen towel roll and a method for manufacturing the kitchen towel roll.

Background Art

[0002] In recent years, various kitchen towel sheets and kitchen towel rolls obtained by winding the sheets in a roll shape have been developed and sold.

[0003] For kitchen towels, strength and firmness during use are important. For ordinary base paper, papermaking techniques have been developed to increase the strength of the base paper in order to achieve firmness.

[0004] On the other hand, the so-called TAD (Through Air Drying) papermaking technique using through-air drying (hereinafter also referred to as the "TAD papermaking method") is excellent as the base paper for kitchen towel rolls because it can obtain a base paper with high water absorbency and a soft texture.

[0005] The kitchen towel sheet made by the TAD papermaking technique is characterized by excellent water absorbency. In order to further increase the water absorbency, studies such as embossing patterns are being conducted.

[0006] As a prior art document regarding kitchen towel rolls, for example, Patent Document 1 discloses a kitchen towel roll obtained by adhesively treating a sheet with an embossing pattern using glue and laminating it in 2 plies and winding it in a roll shape. The kitchen towel sheet has a pattern of irregularities derived from a papermaking process different from the embossing pattern, and the basis weight of the 2 plies is 30 g / m 2 or more and 54 g / m 2 or less, 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 2-ply is 220 g or more and 600 g or less, and the roll length of the kitchen towel roll is 14 m or more and 44 m or less, and the roll diameter is 110 mm or more and 189 mm or less.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] When making tissue paper, it is common to use dry pulp. Since dry pulp has been dried once, the pores of the fibers are reduced, and the water absorption, especially the water absorption rate, tends to decrease.

[0009] Therefore, when using wet pulp that retains a large amount of moisture, the water absorption, especially the water absorption rate, is improved. On the other hand, when using wet pulp, the strength increases, so the paper feels hard, and even when made by the TAD papermaking technique, the texture is inferior as a result.

[0010] Of course, increasing the basis weight of the sheet improves water absorption, but this time the cost increases. Therefore, in the case of a kitchen towel sheet made by the TAD papermaking technique, it has been difficult to further improve the water absorption without increasing the cost of the basis weight and to ensure the tear resistance and softness of the paper.

[0011] The present invention has been made in view of such circumstances, and an object thereof is to provide a kitchen towel roll that maintains the basis weight of the sheet, has a soft texture, is excellent in water absorption, and is difficult to tear, and a method for manufacturing the kitchen towel roll.

Means for Solving the Problems

[0012] The inventors conducted intensive studies and found that in a kitchen towel roll formed by winding a kitchen towel sheet in which at least a sheet with an embossed pattern on one ply is laminated into two or three plies, by setting the basis weight per product ply and the water absorption rate (0.1 ml), and the GMT, which is the square root of the product of DMDT and DCDT, and the value obtained by dividing GMT by the basis weight per product ply within predetermined numerical ranges respectively, it is possible to obtain a kitchen towel roll that maintains the basis weight of the sheet, has a soft texture, is excellent in water absorbency, and is difficult to tear, thus solving the above problems and completing the present invention. That is, the present invention provides the following.

[0013] (1) The first aspect of the present invention is a kitchen towel roll formed by winding a kitchen towel sheet in which at least a sheet with an embossed pattern on one ply is laminated into two or three plies, wherein the basis weight per product ply of the kitchen towel sheet is 30 g / m 2 or more and 56 g / m 2 or less, the water absorption rate (0.1 ml) is 1.5 seconds / 0.1 ml or less, the GMT, which is the square root of the product of the tensile strength DMDT in the MD direction and the tensile strength DCDT in the CD direction when dry, based on JIS P 8113, of the kitchen towel sheet is 6 N / 25 mm or more and 17 N / 25 mm or less, and the value obtained by dividing the GMT by the basis weight per product ply (GMT / product basis weight) is 0.13 or more and 0.40 or less.

[0014] (2) The second aspect of the present invention is the kitchen towel roll according to (1), wherein the water absorption rate (1.0 ml) of the kitchen towel sheet is 1.8 seconds / 1.0 ml or less.

[0015] (3) The third aspect of the present invention is the kitchen towel roll according to (2), wherein after measuring the water absorption rate (1.0 ml) in the kitchen towel sheet, the length of the longest part of the portion where water has diffused after 1 minute has elapsed is 13 cm or less.

[0016] (4) The fourth aspect of the present invention is the kitchen towel roll described in (1), wherein the kitchen towel sheet has a concavo-convex pattern derived from a papermaking process different from the embossed pattern.

[0017] (5) The fifth aspect of the present invention is the kitchen towel roll described in (1), wherein the specific volume of the kitchen towel sheet is 7 cm 3 / g or more and 23 cm 3 / g or less.

[0018] (6) The sixth aspect of the present invention is the kitchen towel roll described in (1), wherein the paper thickness of the kitchen towel sheet is 2.0 mm / 10 sheets or more and 3.9 mm / 10 sheets or less.

[0019] (7) The seventh aspect of the present invention is the kitchen towel roll described in (1), including those in which the embossed pattern is linear, and in the linear embossed pattern, the area occupied by embosses having 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 30% or less of the sheet area of the kitchen towel sheet.

[0020] (8) The eighth aspect of the present invention is the kitchen towel roll described in (1), wherein the wet pulp content in the kitchen towel sheet is 50% or more.

[0021] (9) The ninth aspect of the present invention is a method for manufacturing the kitchen towel roll described in (1), wherein the kitchen towel sheet is manufactured by the TAD papermaking method.

Advantages of the Invention

[0022] According to the present invention, it is possible to provide a kitchen towel roll that maintains the basis weight of the sheet, has a soft texture, is excellent in water absorption, and is difficult to tear, and a method for manufacturing the kitchen towel roll.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an exemplification for explaining the present invention, and is not intended to limit the present invention to the following contents. The present invention can be appropriately modified and implemented within the scope of its gist.

[0025] Also, in the kitchen towel sheet, the MD direction is the flow direction (Machine Direction) when the kitchen towel sheet is paper-made, and the CD direction is the direction (Cross Direction) perpendicular to the MD direction.

[0026] <Kitchen Towel Roll> Figure 1 is a perspective view of a kitchen towel roll 1 according to an embodiment of the present invention. As shown in Figure 1, the kitchen towel roll 1 according to this embodiment is a kitchen towel roll 1 formed by winding a kitchen towel sheet 1x, which is obtained by laminating sheets with an embossed pattern on at least 1 ply into 2 plies or 3 plies, in a roll shape. Note that the kitchen towel sheet 1x is preferably perforated in the roll width direction at substantially equal intervals in the roll winding direction (not shown). Also, the kitchen towel sheet 1x is preferably 2 plies. As shown in Figure 1, of 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). Also, the end of the kitchen towel sheet 1x is referred to as the outermost peripheral edge 1e of the kitchen towel roll 1.

[0027] Examples of the uses of the kitchen towel roll 1 include a roll body of kitchen paper (which may also be referred to as paper towel, cooking paper, etc.) used for wiping off moisture or oil or removing dirt in a household kitchen, a kitchen in a restaurant, etc., and a roll body of other toilet paper.

[0028] (Roll length and roll diameter) The roll length of the kitchen towel roll 1 preferably has a lower limit value of 18 m or more, more preferably 20 m or more, and still more preferably 25 m or more. Also, the upper limit value is preferably 45 m or less, more preferably 40 m or less, and still more preferably 35 m or less. If the roll length is less than 18 m, it is necessary to increase the basis weight of the kitchen towel sheet 1x as a result to obtain a certain range of roll diameter DR, which increases the manufacturing cost. If the roll length exceeds 45 m, it is necessary to decrease the basis weight of the kitchen towel sheet 1x as a result to obtain a certain range of roll diameter, and the water absorption is inferior.

[0029] The roll length is measured as follows. First, for the kitchen towel sheet 1x between the seams 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. When there is no seam on the kitchen towel roll 1, the roll length is actually measured.

[0030] Regarding the roll diameter DR of the kitchen towel roll 1 according to this embodiment, the lower limit value is preferably 127 mm or more, more preferably 135 mm or more, and still more preferably 140 mm or more. The upper limit value is preferably 175 mm or less, more preferably 165 mm or less, and still more preferably 157 mm or less. When the roll diameter DR is less than 127 mm, as a result, the basis weight of the kitchen towel sheet 1x becomes low and the water absorption property is inferior. When the roll diameter DR exceeds 175 mm, as a result, the basis weight of the kitchen towel sheet 1x becomes high and the manufacturing cost becomes high.

[0031] The roll diameter DR of the roll is actually measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed on 3 kitchen towel rolls 1, and the measurement results are averaged.

[0032] (Roll width and roll weight) Regarding the roll width of the kitchen towel roll 1, the lower limit value is preferably 150 mm or more, more preferably 200 mm or more, and still more preferably 250 mm or more. Also, the upper limit value is preferably 380 mm or less, more preferably 340 mm or less, and still more preferably 300 mm or less. When the roll width is less than 150 mm, the kitchen towel sheet 1x is inferior in water absorption property. When the roll width exceeds 380 mm, more kitchen towel sheet 1x than necessary will be used during use, which is inferior in terms of cost.

[0033] In addition, the roll weight of the kitchen towel roll 1 preferably has a lower limit value of 200 g or more, more preferably 240 g or more, and even more preferably 260 g or more. Also, the upper limit value is preferably 550 g or less, more preferably 490 g or less, and even more preferably 450 g or less. If the roll weight is less than 200 g, as a result, the basis weight of the kitchen towel sheet 1x becomes low and the water absorption property deteriorates. If the roll weight exceeds 550 g, as a result, the basis weight of the kitchen towel sheet 1x becomes high and the manufacturing cost becomes high.

[0034] The roll weight is the weight per 280 mm of roll width, excluding the paper tube (core) in the kitchen towel roll 1. When the roll width is not 280 mm, it is converted to the weight per 280 mm by proportional calculation.

[0035] (Roll density) The roll density of the kitchen towel roll 1 according to the present embodiment preferably has a lower limit value of 0.04 g / cm 3 or more, more preferably 0.05 g / cm 3 or more, and even more preferably 0.06 g / cm 3 or more. Also, the upper limit value is preferably 0.13 g / cm 3 or less, more preferably 0.11 g / cm 3 or less, and even more preferably 0.09 g / cm 3 or less. If the roll density is less than 0.04 g / cm 3 , as a result, the paper thickness of the kitchen towel sheet 1x becomes high and the texture deteriorates. If the roll density exceeds 0.13 g / cm 3 , as a result, the paper thickness of the kitchen towel sheet 1x becomes low and the water absorption property deteriorates.

[0036] The roll density is expressed as (roll weight) ÷ (roll volume). The roll weight is the weight of the kitchen towel roll 1 per 280 mm of roll width. The roll volume is expressed as [{cross-sectional area of the outer diameter (winding diameter DR) part of the roll} - {cross-sectional area of the core outer diameter DI part}] × roll width (converted per 280 mm). For example, when the roll weight (excluding the core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the core outer diameter DI is 39 mm, 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 It becomes like this.

[0037] (Winding density) The winding density of the kitchen towel roll 1 according to this embodiment preferably has a lower limit value of 0.20 m / cm 2 or more, more preferably 0.24 m / cm 2 or more, and still more preferably 0.30 m / cm 2 or more. Also, the upper limit value is preferably 0.56 m / cm 2 or less, more preferably 0.50 m / cm 2 or less, and still more preferably 0.45 m / cm 2 or less. When the winding density is less than 0.20 m / cm 2 , as a result, the basis weight of the kitchen towel sheet 1x becomes high and the manufacturing cost becomes high. When the winding density exceeds 0.56 m / cm 2 , as a result, the basis weight of the kitchen towel sheet 1x becomes low and the water absorption is poor.

[0038] 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 core outer diameter DI part}. 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 It becomes

[0039] (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, preferably has a lower limit of 28 mm or more, more preferably 33 mm or more, and even more preferably 40 mm or more. Also, the upper limit is preferably 58 mm or less, more preferably 53 mm or less, and even more preferably 46 mm or less. If the core outer diameter DI is less than 28 mm, the winding diameter DR will be small as a result. Therefore, in order to obtain a winding diameter DR within a certain range, it is necessary to increase the basis weight of the kitchen towel sheet 1x instead, resulting in higher manufacturing costs. If the core outer diameter DI exceeds 58 mm, the winding diameter DR will be large as a result. Therefore, in order to obtain a winding diameter DR within a certain range, it is necessary to lower the basis weight of the kitchen towel sheet 1x instead, resulting in inferior water absorption.

[0040] The core outer diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed on three kitchen towel rolls 1, and the measurement results are averaged. When there is no paper tube in the core, the outer diameter of the cavity in the core part is measured.

[0041] <Kitchen towel sheet> (Basis weight) The basis weight per product price of the kitchen towel sheet 1x according to the present embodiment is 30 g / m 2 or more and 56 g / m 2 or less. If the basis weight per product price is less than 30 g / m 2 , the kitchen towel sheet 1x is inferior in water absorption. Also, if the basis weight per product price exceeds 56 g / m 2 , the manufacturing cost will increase. Note that the basis weight per product price of the kitchen towel sheet 1x preferably has a lower limit of 34 g / m 2 or more, and more preferably 38 g / m 2 or more. Also, the upper limit is 50 g / m 2It is preferably the following, 46 g / m 2 It is more preferably the following. The basis weight per product price of the kitchen towel sheet 1x can be measured based on JIS P 8124. At this time, the "basis weight per product price" means the basis weight of the kitchen towel sheet 1x at the time when the kitchen towel sheet 1x and the kitchen towel roll 1 are manufactured, and when the price is neither laminated nor peeled off.

[0042] (Paper thickness) The paper thickness of the kitchen towel sheet 1x is preferably 2.0 mm / 10 sheets or more and 3.9 mm / 10 sheets or less. If the paper thickness is less than 2.0 mm / 10 sheets, the kitchen towel sheet 1x is inferior in water absorption. If the paper thickness exceeds 3.9 mm / 10 sheets, the manufacturing cost will increase. In addition, the lower limit of the paper thickness of the kitchen towel sheet 1x is more preferably 2.3 mm / 10 sheets or more, and even more preferably 2.6 mm / 10 sheets or more. The upper limit is more preferably 3.6 mm / 10 sheets or less, and even more preferably 3.3 mm / 10 sheets or less.

[0043] The paper thickness can be measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 37.85 gf / cm 2 , a measuring head diameter of 30 mm. Place the sample between the measuring head and the measuring table, and read the gauge when the measuring head is lowered at a speed of 1 mm or less per second. As the sample, measure the kitchen towel sheet 1x as 10 ply (if it is 2 ply, make it 5 sets, if it is 3 ply, make it 3 sets and multiply the measured value by 10 / 9 to make it 10 ply). Also, repeat the measurement 10 times at different locations and average the measurement results.

[0044] Note that the paper thickness of the product ply of the kitchen towel sheet 1x preferably has a lower limit value of 0.40 mm or more, more preferably 0.45 mm or more, and still more preferably 0.50 mm or more. The upper limit value is preferably 0.80 mm or less, more preferably 0.72 mm or less, and still more preferably 0.68 mm or less. If the paper thickness of the product ply is less than 0.40 mm, the kitchen towel sheet 1x is inferior in water absorption. If the paper thickness of the product ply exceeds 0.80 mm, the manufacturing cost increases. For the paper thickness of the product ply of the kitchen towel sheet 1x, the value of the paper thickness (for 10 sheets) described above is used as the value of the product ply by proportional calculation.

[0045] (Sheet length) The sheet length between the stitch marks (the length of the kitchen towel sheet 1x in the roll winding direction) preferably has a lower limit value of 100 mm or more, more preferably 130 mm or more, and still more preferably 150 mm or more. The upper limit value is preferably 250 mm or less, more preferably 230 mm or less, and still more preferably 210 mm or less. If the sheet length is less than 100 mm, the kitchen towel sheet 1x is inferior in water absorption. If the sheet length exceeds 250 mm, more kitchen towel sheet 1x than necessary will be used during use, resulting in inferior cost performance.

[0046] (Specific volume) The specific volume of the kitchen towel sheet 1x is preferably 7 cm 3 / g or more and 23 cm 3 / g or less. If the specific volume of the kitchen towel sheet 1x is less than 7 cm 3 / g, the kitchen towel sheet 1x is inferior in water absorption. Also, if the specific volume of the kitchen towel sheet 1x exceeds 23 cm 3 / g, the manufacturing cost increases. Note that the specific volume of the kitchen towel sheet 1x preferably has a lower limit value of 9 cm 3 / g or more, more preferably 12 cm 3 / g or more. The upper limit value is 20 cm 3It is more preferably 17 cm or less, and even more preferably 17 g or less. The specific volume is obtained by dividing the paper thickness per ply of the kitchen towel sheet 1x by the basis weight per ply (paper thickness per product ply divided by basis weight per product ply), and is expressed as the volume (cm 3 ) per unit (g). 3

[0047] (DMDT, DCDT, and GMT) For the kitchen towel sheet 1x, the dry MD-direction tensile strength DMDT (Dry Machine Direction Tensile Strength) based on JIS P 8113 preferably has a lower limit of 6 N / 25 mm or more, more preferably 7 N / 25 mm or more, and even more preferably 8 N / 25 mm or more. Also, the upper limit is preferably 17 N / 25 mm or less, more preferably 14 N / 25 mm or less, and even more preferably 11 N / 25 mm or less. Also, for the kitchen towel sheet 1x, the dry CD-direction tensile strength DCDT (Dry Cross Direction Tensile Strength) based on JIS P 8113 preferably has a lower limit of 6 N / 25 mm or more, more preferably 7 N / 25 mm or more, and even more preferably 8 N / 25 mm or more. Also, the upper limit is preferably 17 N / 25 mm or less, more preferably 14 N / 25 mm or less, and even more preferably 11 N / 25 mm or less.

[0048] If DMDT is less than 6 N / 25 mm or DCDT is less than 6 N / 25 mm, the kitchen towel sheet 1x is likely to tear. If DMDT exceeds 17 N / 25 mm or DCDT exceeds 17 N / 25 mm, the texture of the kitchen towel sheet 1x is poor.

[0049] Furthermore, GMT, which is the square root of the product of DMDT and DCDT, is 6 N / 25 mm or more and 17 N / 25 mm or less. If GMT is less than 6 N / 25 mm, the kitchen towel sheet 1x is likely to tear. If GMT exceeds 17 N / 25 mm, the kitchen towel sheet 1x has poor texture. Note that the lower limit of GMT is preferably 7 N / 25 mm or more, more preferably 8 N / 25 mm or more. The upper limit is preferably 14 N / 25 mm or less, more preferably 11 N / 25 mm or less.

[0050] And in the kitchen towel sheet 1x, the value obtained by dividing GMT by the basis weight per product price (GMT / basis weight per product price) is 0.13 or more and 0.40 or less. If the value is less than 0.13, the kitchen towel sheet 1x is likely to tear. If the value exceeds 0.40, the kitchen towel sheet 1x has poor texture. Note that the lower limit of the value obtained by dividing GMT by the basis weight per product price (GMT / basis weight per product price) is preferably 0.15 or more, more preferably 0.18 or more. The upper limit is preferably 0.33 or less, more preferably 0.25 or less.

[0051] The DMDT and DCDT of the kitchen towel sheet 1x are measured in accordance with JIS P 8113, and the ratio (DMDT / DCDT) is calculated from the measured DMDT and DCDT. Also, GMT is calculated from the square root of the product of the measured DMDT and DCDT. Note that DMDT, DCDT, and GMT are all measured with the kitchen towel sheet 1x in its product price state.

[0052] (Emboss) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an embossing pattern. Further, the kitchen towel sheet 1x in the present invention is embossed at least once and then laminated to form 2-ply or 3-ply. When laminating to 2-ply or 3-ply, it is preferable to use, for example, plybond glue (paste), apply the glue, and perform an adhesion treatment. By adhering in this way to form 2-ply or 3-ply, the adhesion of the plies becomes stronger, and even when the kitchen towel sheet 1x gets wet with water, the plies do not peel off and it is less likely to tear. Also, water may be used instead of plybond glue (paste).

[0053] It is preferable that an embossing pattern is imparted to the ply on the surface 1a side of the kitchen towel sheet 1x. By applying the embossing pattern to the surface 1a side, glue can be applied to the embossed portion and laminated into 2-ply or 3-ply. Also, the sheet on the back surface 1b side may (or may have) an embossing pattern, but it is preferable that it does not (does not have) an embossing pattern. By the back surface 1b side not having an embossing pattern, a kitchen towel sheet 1x (kitchen towel roll 1) with excellent texture can be obtained. The embossing pattern is not particularly limited as long as it is a pattern generally applied to a kitchen towel, such as a dot pattern or a linear pattern, but among them, a linear embossing pattern is preferable. By using a linear embossing pattern, a kitchen towel sheet 1x (kitchen towel roll 1) with excellent texture can be obtained.

[0054] FIG. 2 is a diagram showing an example of an embossing pattern in the kitchen towel roll of the embodiment. The linear embossed pattern is not particularly limited, but a pattern as shown in Fig. 2 is preferred. Specifically, one pattern may be a pattern including two types of figures, a substantially circular shape that is substantially round and a figure having another pattern inside it, and the whole is substantially line-symmetric vertically and horizontally (a tilt may be provided), and including a combination of a plurality of curves and figures. The shape of the figure is not particularly limited. For the substantially circular shape that is substantially round, it is preferable that the substantially round shape is double.

[0055] Also, as the dimensions of the embossed pattern, it is preferable that the quadrilateral E (E is not an embossed pattern) surrounding the embossed pattern is a square with a side length of 2 cm or more and 25 cm or less, more preferably a square with a side length of 5 cm or more and 20 cm or less, and even more preferably a square with a side length of 8 cm or more and 15 cm or less. For this quadrilateral E, it is preferable that the vertical direction is parallel to the flow direction of the kitchen towel roll 1, and the horizontal direction is parallel to the width direction of the kitchen towel roll 1, but it may be tilted. By using such a pattern, in the kitchen towel sheet 1x with a high water absorption like the present application, the water absorption can be improved, the ply is not easily peeled off, and the strength can be maintained, so a firm feeling can be obtained.

[0056] At this time, in the linear embossed pattern, it is preferable that the area occupied by the embosses 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 30% or less of the area of the kitchen towel sheet 1x. If the ratio is less than 4%, the adhesion between the plies of the kitchen towel sheet 1x becomes weak, and it is easily torn during water absorption. If the ratio exceeds 30%, the texture of the kitchen towel sheet 1x is inferior. In addition, with respect to the area of the kitchen towel sheet 1x, the ratio of the area occupied by the embosses with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more in the linear embossed pattern, the lower limit value is more preferably 6% or more, and even more preferably 8% or more. The upper limit value is more preferably 25% or less, and even more preferably 15% or less.

[0057] The ratio of the area is measured as follows: inside the quadrilateral E that contains all of one embossing pattern as shown in Figure 2, for embossings with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more, the sum when the embossing lengths are added is taken as the total length, and the embossing area is obtained as the total length (mm) × width (mm). When the area of one sheet of the kitchen towel sheet 1x is taken as (the sheet length of one sheet × sheet width), it is obtained as (embossing area / area of one sheet of the kitchen towel sheet 1x) × 100 (%). In addition, when it is difficult to obtain the embossing area ratio, the area ratio of the convex part of the embossing roll used when performing embossing can be regarded as the area of one sheet of the kitchen towel sheet 1x.

[0058] In addition, the size of one side of this quadrilateral E can be appropriately changed according to the size of the embossing pattern. Also, when an embossing pattern adjacent to the embossing pattern contained in the quadrilateral is included within the quadrilateral that contains all of the embossing patterns, the length of the adjacent embossing pattern is also measured and included in the total length. When the size of one side of the quadrilateral E cannot be clearly determined by the embossing pattern, the size of the quadrilateral E is taken as 10 × 10 cm, and the total length of the embossing lengths contained in this quadrilateral E is measured. The total length is obtained by actual measurement using a ruler, a measuring tool, etc. by the method described above. In addition, when it is difficult to visually observe the embossing, measurement may be performed using a general microscope.

[0059] In the embossing pattern, the depth of the embossing preferably has a lower limit value of 0.06 mm or more, more preferably 0.10 mm or more, and still more preferably 0.14 mm or more. The upper limit value is preferably 1.05 mm or less, more preferably 0.55 mm or less, and still more preferably 0.35 mm or less. When the depth of the embossing is less than 0.06 mm, the adhesion between the plies of the kitchen towel sheet 1x becomes weak, and it is likely to tear when absorbing water. When the depth exceeds 1.05 mm, the texture of the kitchen towel sheet 1x is inferior.

[0060] The depth of the emboss is measured using, for example, a microscope. As the microscope, the product name "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 name "VR-H1A" can be used. The measurement conditions are measurement under the conditions of a magnification of 25 times and a field of view area of 12 mm × 9 mm. The measurement magnification and the field of view area may be appropriately changed depending on the size of the emboss to be obtained.

[0061] Figure 3 shows the height profile on the X-Y plane by the microscope, and the height of the surface of the kitchen towel sheet 1x is represented by shading. The linear part where the shading in Figure 3 is different from the periphery indicates each emboss. The depth of the emboss is obtained by measuring the height difference of the emboss using the above microscope. Note that the measurement is preferably performed on the surface 1a side of the kitchen towel sheet 1x. Also, at the time of measurement, remove the kitchen towel sheet 1x three turns from the kitchen towel roll 1, and use the fourth turn of the kitchen towel sheet 1x to perform the measurement in the state of the sheet without changing the ply number. Also, when there are perforations, avoid measuring them all.

[0062] First, draw a line segment AB as shown in Figure 3 to obtain the height profile of Figure 4. Note that the line segment AB may be drawn so as to cross the emboss. The line segment AB is drawn in the roll width direction (CD direction) of the kitchen towel sheet 1x, but when the interval between the embosses is narrow, for example, 2 mm or less, and the height of the convex part below becomes low, the line segment may be drawn in an oblique direction or in the roll winding direction. The height profile is a (measurement) cross-sectional curve S that represents the unevenness of the actual sample surface of the kitchen towel sheet 1x. However, the (measurement) cross-sectional curve S also includes noise (sharp peaks caused by fiber lumps on the surface of the kitchen towel sheet 1x, fibers growing in a beard shape, or parts without fibers). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0063] Therefore, the cross-sectional curve S in Fig. 4 (measurement) is used with the filter size of the weighted average radio button set to ±12, and the smoothed cross-sectional curve W in Fig. 5 is obtained. Note that the smoothing using the filter of the weighted average radio button can be automatically obtained by using the above analysis software. Then, in the graph shown in Fig. 5, the average value of the 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 in the concave part D1 sandwiched between the convex part H1 and the convex part H2 is obtained. The numerical value obtained by subtracting the minimum value from the average value of the maximum values thus obtained is set as the provisional embossing depth. Furthermore, as shown in Fig. 5, the same measurement is performed for a total of two consecutive locations on the cross-sectional curve (a total of two consecutive locations, namely the concave part D1 and the concave part D2 sandwiched between the convex part H3 and the convex part H4) (at this time, two measurement results are obtained). Then, the same measurement as above is performed at each position where the kitchen towel roll 1 is rotated three times by 90 degrees each in the roll winding direction of the kitchen towel sheet 1x (the total number of measurement positions in the roll winding direction is four). And finally, the average value of a total of eight locations (2×4) is adopted as the embossing depth.

[0064] Note that the kitchen towel sheet 1x according to this embodiment preferably has a pattern of unevenness derived from a papermaking process different from the embossing pattern as described later. However, due to having a pattern of unevenness derived from the papermaking process, there is variation in the heights of the left and right convex parts sandwiching the concave part. Therefore, when the difference in the values of the vertical axes 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 location avoiding that part.

[0065] Regarding whether the embossing pattern is applied or not, there is no particular limitation as long as the back surface 1b of the kitchen towel sheet 1x has a pattern of unevenness derived from a papermaking process different from the embossing pattern. Nested embossing or pin-to-pin embossing may be applied, or embossing may not be applied, but preferably it is nested embossing or no embossing, and more preferably no embossing.

[0066] (Water absorption) In the present invention, the water absorption per unit area of the kitchen towel sheet 1x preferably has a lower limit of 240 g / m 2 or more, more preferably 290 g / m 2 or more, and even more preferably 380 g / m 2 or more. The upper limit is preferably 610 g / m 2 or less, more preferably 550 g / m 2 or less, and even more preferably 500 g / m 2 or less. If the water absorption per unit area is less than 240 g / m 2 , the kitchen towel sheet 1x is inferior in water absorption. Also, if the water absorption per unit area exceeds 610 g / m 2 , the manufacturing cost will increase.

[0067] In addition, the water absorption per unit weight of the kitchen towel sheet 1x preferably has a lower limit of 8.0 g / g or more, more preferably 8.5 g / g or more, and even more preferably 9.0 g / g or more. The upper limit is more preferably 14 g / g or less, and even more preferably 13 g / g or less. If the water absorption per unit weight is less than 8.0 g / g, the kitchen towel sheet 1x is inferior in water absorption.

[0068] The measurement method of each water absorption of the kitchen towel sheet 1x will be described below with reference to FIG. 6. First, the kitchen towel sheet 1x stacked in 2-ply is sampled, and one piece is cut using a template of a 7.6 cm (3 inches) square to produce 10 test pieces 10 in the shape of a rectangle with a side of 7.6 cm. The weight of the test piece 10 before water absorption is measured with an electronic balance. The test piece 10 is set on a holder 12 (a jig for fixing three points of the test piece, and the jig is made of a metal that does not absorb moisture).

[0069] Next, put distilled water in a commercially available bat to a depth of 2 cm, and immerse the test piece 10 set in the holder 12 in the distilled water for 2 minutes. After 2 minutes of immersion, take out the test piece 10 together with the holder 12 from the distilled water, and attach the strip 11 to one corner 10d of the test piece 10 as shown in Fig. 6. The strip 11 is obtained by peeling one ply of the same kitchen towel as the two-ply kitchen towel to be measured into one ply, cutting the paper kitchen towel one ply into a size of 2 mm × 15 mm in length, and attaching it to a portion 6 mm from the corner 10d of the test piece 10 toward the center. Next, suspend the holder 12 and the test piece 10 from a rod installed in an empty water tank with the corner 10a facing the corner 10d facing upward, close the lid of the water tank, and leave it for 15 minutes.

[0070] Thereafter, take out the holder 12 and the test piece 10 from the water tank, remove the strip 11 and the holder 12, and measure the weight of the test piece 10 with an electronic balance. From 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 (g of water / sheet m 2 per 1 m 2 . Abbreviated as g / m 2 ). Further, by dividing the water absorption amount per unit area (g of water / sheet m 2 ) by the basis weight of the product ply of the test piece 10, calculate the water absorption amount per unit area (g of water / sheet m 2 ) / basis weight (g of sheet / sheet m 2 ) = water absorption amount per unit weight (g of water / sheet g, per 1 g. Abbreviated as g / g). The measurement is performed 5 times for each sample, and the average value is adopted. In addition, when the kitchen towel sheet 1x is 3 plies, it is preferably measured in the same procedure as in the case of 2 plies. Also, this measurement is carried out in accordance with 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.

[0071] (Water absorption rate) In addition, the water absorption rate (0.1 ml) of the kitchen towel sheet 1x is 1.5 seconds / 0.1 ml or less. If the water absorption rate (0.1 ml) exceeds 1.5 seconds / 0.1 ml, the kitchen towel sheet 1x is inferior in water absorption. Note that the water absorption rate (0.1 ml) of the kitchen towel sheet 1x is preferably 1.3 seconds / 0.1 ml or less, and more preferably 1.0 second / 0.1 ml or less.

[0072] Furthermore, the water absorption rate (1.0 ml) of the kitchen towel sheet 1x is preferably 1.8 seconds / 1.0 ml or less. If the water absorption rate (1.0 ml) exceeds 1.8 seconds / 1.0 ml, the kitchen towel sheet 1x is inferior in water absorption. Note that the water absorption rate (1.0 ml) of the kitchen towel sheet 1x is more preferably 1.5 seconds / 1.0 ml or less, and even more preferably 1.0 second / 1.0 ml or less. Note that when the water absorption rate is less than 1.0 second, it is difficult to measure the exact value (for example, to measure less than 1 second with a stopwatch, one has to press the button quickly), so it can be uniformly set to less than 1.0 second.

[0073] After measuring the water absorption rate (1.0 ml) in the kitchen towel sheet, it is preferably that the length of the longest part of the water diffusion part after 1 minute is 13 cm or less. If the length of the longest part exceeds 13 cm, the kitchen towel sheet 1x is inferior in water absorption. Note that after measuring the water absorption rate (1.0 ml) in the kitchen towel sheet, the length of the longest part of the water diffusion part after 1 minute preferably has a lower limit of 7 cm or more, more preferably 8 cm or more, and an upper limit of 13 cm or less, more preferably 11 cm or less. The water absorption rate (0.1 ml) of the kitchen towel sheet 1x is measured in accordance with the old JIS S 3104. Also, for the water absorption rate (1.0 ml) of the kitchen towel sheet 1x, 0.1 ml is dropped every second, and the time (seconds) from when 1.0 ml is dropped until the water droplet is absorbed is measured. Note that the measurement of "the length of the longest part of the water diffusion part after 1 minute after measuring the water absorption rate (1.0 ml) in the kitchen towel sheet" described above is measured 1 minute after the water droplet (1.0 ml) is absorbed.

[0074] Incidentally, the kitchen towel sheet 1x preferably contains wet pulp. And the content rate of the wet pulp is preferably 50% or more. If the content rate of the wet pulp is less than 50%, the kitchen towel sheet 1x is inferior in water absorption. Although the upper limit value of the content rate of the wet pulp is not particularly set, since the strength of the kitchen towel sheet 1x tends to be high, the texture may be inferior. Therefore, as described above, by appropriately setting the GMT and (GMT / product basis weight) values of the kitchen towel sheet 1x, the texture can be improved. The content rate of the wet pulp in the kitchen towel sheet 1x is more preferably 65% or more, and even more preferably 80% or more.

[0075] Also, as the pulp, for example, softwood kraft pulp (NBKP), hardwood kraft pulp (LBKP), etc. can be used. And the content ratio is preferably NBKP:LBKP = 20 - 80 mass%:20 - 80 mass%, more preferably NBKP:LBKP = 30 - 70 mass%:30 - 70 mass%, and even more preferably NBKP:LBKP = 40 - 60 mass%:40 - 60 mass%.

[0076] <Manufacturing method of kitchen towel roll> The kitchen towel roll 1 can be manufactured, for example, in the order of (1) papermaking and creping, (2) embossing and adhesion treatment, (3) roll winding process. Incidentally, in the manufacturing (papermaking) process of the kitchen towel sheet 1x, it is preferable to use the TAD papermaking method.

[0077] At this time, in the papermaking process, it is preferable that a pattern of unevenness derived from a papermaking process (fabric) different from the above-mentioned embossing pattern is applied to the kitchen towel sheet 1x. By having this pattern of unevenness, the water absorption amount of the kitchen towel sheet 1x becomes even higher. Note that "derived from the papermaking process" means that in the papermaking process of the kitchen towel sheet 1x, an uneven pattern is imparted between the headbox of the paper machine and the outlet of the Yankee dryer 22. Specifically, in a part of the papermaking process shown in FIG. 7, unevenness can be imparted by the (belt) press section 20 disposed between the dewatering roll 21 and the Yankee dryer 22. In the (belt) press section 20, an uneven pattern can be imparted to the wet paper 24 by pressing the wet paper 24 and the uneven belt 23 (the uneven belt 23 loops around the (belt) press section 20 and the Yankee dryer 22) together. Note that the uneven belt 23 may be an uneven fabric (wire).

[0078] Also, the uneven pattern can be appropriately changed by changing the pattern of the fabric (fine pattern, rough pattern). When the uneven pattern is changed, the specific volume (paper thickness) changes, but it is preferable to select a pattern such that the specific volume in the roll state is within the numerical range described above.

[0079] As described above, according to the present embodiment, it is possible to provide a kitchen towel roll that maintains the basis weight of the sheet, has a soft texture, is excellent in water absorption, and is difficult to tear, and a method for manufacturing the kitchen towel roll.

[0080] As described above, the present invention has been described using the embodiments, but it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. Also, it is obvious from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Examples

[0081] Hereinafter, the present invention will be described in detail with reference to examples. Note that the present invention is not limited to the examples shown below.

[0082] (1) Papermaking and creping, (2) Embossing and lamination, (3) Roll winding process, and through these steps, kitchen towel rolls of Examples 1 to 12 and Comparative Examples 1 to 5 shown in Table 2 were manufactured. Then, for the kitchen towel roll packages of all examples and comparative examples, the above-mentioned parameters were measured and the following evaluations were conducted. In addition, for each parameter other than the following evaluations, it was carried out according to the above-mentioned criteria or measurement methods.

[0083] 1. Water absorbency of the kitchen towel sheet The water absorption rate of the kitchen towel sheet after production was actually measured and evaluated in four grades. The evaluation criteria are as shown in Table 1 below.

Table 1

[0084] 2. Manufacturing cost of the kitchen towel sheet (basis weight of the sheet) The basis weight of the product price of the sheet in the kitchen towel sheet after production was actually measured and evaluated in four grades. The evaluation criteria are as follows. ◎: When the basis weight is 46 g / m 2 or less ○: When the basis weight exceeds 46 g / m 2 and is 50 g / m 2 or less △: When the basis weight exceeds 50 g / m 2 and is 56 g / m 2 or less ×: When the basis weight exceeds 56 g / m 2

[0085] 3. Texture of the kitchen towel sheet The texture (softness) of the kitchen towel sheet when held by hand after production was subjectively evaluated by 30 monitors, and evaluated in four grades according to the number of people who felt that "the sheet is hard". The evaluation criteria are as follows. ◎: The number of people who felt that "the sheet is hard" is 0 - 3 ○: The number of people who felt that "the sheet is hard" is 4 - 7 △: The number of people who felt that "the sheet is hard" is 8 - 10​ ×: Those who felt that "the sheet is hard" were 11 or more people

[0086] 4. Resistance to tearing of the kitchen towel sheet The resistance to tearing of the kitchen towel sheet after production was sensory evaluated by 30 monitors, and evaluated in five grades according to the number of people who felt that it was "prone to tearing". The evaluation criteria are as follows. ◎: The number of people who felt that it was "prone to tearing" was 0 to 3 people ○: The number of people who felt that it was "prone to tearing" was 4 to 7 people △: The number of people who felt that it was "prone to tearing" was 8 to 10 people ×: The number of people who felt that it was "prone to tearing" was 11 or more people

[0087]

Table 2

[0088] As is clear from the results shown in Table 2, all of the kitchen towel rolls of Examples 1 to 12 maintained the manufacturing cost, had a soft texture, were excellent in water absorbency, and were resistant to tearing. On the other hand, all of Comparative Examples 1 to 5 were inferior in any of the manufacturing cost, texture, water absorbency, and resistance to tearing. Therefore, it was confirmed that the kitchen towel roll of the present invention can provide a kitchen towel roll that maintains the basis weight of the sheet, has a soft texture, is excellent in water absorbency, and is resistant to tearing.

Explanation of symbols

[0089] 1 Kitchen towel roll 1a Surface 1b Back surface 1e Edge of the outermost periphery of the kitchen towel roll 1x Kitchen towel sheet 10 Test piece 10a, 10d Corners 11 Band 12 Holder 20 (Belt) Press Section 21 Dehydration Roll 22 Yankee Dryer 23 Embossed Belt 24 Wet Paper

Claims

1. A kitchen towel roll obtained by winding a kitchen towel sheet in which at least one ply is provided with an embossed pattern into a roll, the kitchen towel sheet being laminated into two or three plies, The basis weight per tatami of the kitchen towel sheet is 30 g / m ２ or more and 56 g / m ２ or less, and the water absorption rate (0.1 ml) is 1.5 seconds / 0.1 ml or less, wherein GMT, which is the square root of the product of the tensile strength DMDT in the MD direction and the tensile strength DCDT in the CD direction when dry, based on JIS P 8113, of the kitchen towel sheet is 6 N / 25 mm or more and 17 N / 25 mm or less, and the value obtained by dividing GMT by the basis weight per product ply (GMT / basis weight per product ply) is 0.13 or more and 0.40 or less. The kitchen towel roll is characterized by this.

2. The kitchen towel roll according to claim 1, wherein the water absorption rate (1.0 ml) of the kitchen towel sheet is 1.8 seconds / 1.0 ml or less.

3. The kitchen towel roll according to claim 2, wherein, after measuring the water absorption rate (1.0 ml) in the kitchen towel sheet, the length of the longest part of the portion where water has diffused after 1 minute has elapsed is 13 cm or less.

4. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a pattern of irregularities derived from a papermaking process different from the embossed pattern.

5. The specific volume of the kitchen towel sheet is 7 cm ３ / g or more and 23 cm ３ / g or less, and the kitchen towel roll according to claim 1 is characterized in that.

6. The kitchen towel roll according to claim 1, wherein the paper thickness of the kitchen towel sheet is 2.0 mm / 10 sheets or more and 3.9 mm / 10 sheets or less.

7. including those in which the embossed pattern is linear, in the linear embossed pattern, the area occupied by embosses having 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 30% or less of the sheet area of the kitchen towel sheet. The kitchen towel roll according to claim 1 is characterized by this.

8. The kitchen towel roll according to claim 1, wherein the wet pulp content in the kitchen towel sheet is 50% or more.

9. A method for manufacturing the kitchen towel roll according to claim 1, characterized in that the kitchen towel sheet is manufactured by the TAD papermaking method. The method for manufacturing the kitchen towel roll according to claim 1 is characterized by this.

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