Kitchen towel roll

Abstract

To provide a kitchen towel roll that maintains a consistent basis weight without excessively increasing it, while also maintaining strength and water absorption, and that is soft to the touch and has a firm feel. [Solution] A kitchen towel roll is made by bonding two sheets, one or both of which have an embossed pattern applied to one ply, with glue, and then winding the laminated kitchen towel sheet into a roll, wherein the basis weight of one ply of the kitchen towel sheet is 16 g / m². 2 More than 27g / m 2 The following conditions must be met: DMDT and DCDT must both be between 600 gf / 25 mm and 1500 gf / 25 mm, the ratio of DMDT to DCDT (DMDT / DCDT) must be between 0.3 and 2.5, the bending resistance in the MD and CD directions must both be between 4.5 mN and 22.0 mN, and the water absorption per unit area must be 330 g / m². 2 More than 600g / m 2 The following features are provided for a kitchen towel roll.

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.

[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] Base paper obtained by the so-called TAD (Through Air Drying) papermaking technique using through-air drying has high water absorption and a soft texture, and thus is excellent as the base paper for a kitchen towel roll.

[0005] As a prior art document of a kitchen towel roll, for example, in Patent Document 1, there is a kitchen towel roll 1 in which a sheet provided with an emboss pattern is adhesively treated with glue and wound into a roll in a 2-ply state. The kitchen towel sheet has a pattern of irregularities derived from a papermaking process different from the emboss pattern, and the basis weight of the 2-ply is 30 g / m 2 to 54 g / m 2 or less, the paper thickness is 1.3 mm / 10 sheets to 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 1 is 14 m or more and 44 m or less, and the roll diameter is 110 mm or more and 189 mm or less. The kitchen towel roll 1 is disclosed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

[0007] Kitchen towel rolls require not only absorbency and a soft texture, but also a firm feel (paper stiffness and resilience) when wiping objects and the ability to withstand tearing. However, in the case of TAD, the use of a textured fabric increases the paper thickness, resulting in a softer texture rather than firmness. Furthermore, because there are fewer interfiber-binding fibers compared to conventional dry crepe paper machines, the strength is reduced.

[0008] Therefore, using conventional embossing patterns (such as squares, circles, or ovals) results in lower strength (or inability to maintain strength). This problem can be addressed by increasing the basis weight, which maintains high strength and water absorption, but this increases costs.

[0009] This invention has been made in view of these circumstances, and aims to provide a kitchen towel roll that maintains a certain range of basis weight without being excessively high, and that is soft to the touch and firm while maintaining strength and water absorption. [Means for solving the problem]

[0010] The inventors conducted thorough research and developed a kitchen towel roll in which two sheets, each with an embossed pattern on one or both sides, are bonded together with glue to form a two-ply laminated kitchen towel sheet. By keeping the basis weight of each ply, the tensile strength in the MD and CD directions and their ratio when dry, the bending resistance in the MD and CD directions, and the water absorption per unit area within predetermined numerical ranges, the inventors were able to maintain a certain range without excessively increasing the basis weight, while also maintaining strength and water absorption, resulting in a kitchen towel roll that is soft to the touch and has a firm feel. Thus, the inventors completed the present invention. In other words, the present invention provides the following:

[0011] (1) The first aspect of the present invention is a kitchen towel roll obtained by adhesively bonding sheets with an embossed pattern applied to one or both of the two-ply sheets, laminating them into two plies, and winding them into a roll, wherein the basis weight of one ply of the kitchen towel sheet is 16 g / m 2 or more and 27 g / m 2 or less, and in the kitchen towel sheet, the tensile strength DMDT in the MD direction and the tensile strength DCDT in the CD direction during drying, both based on JIS P 8113, are each 600 gf / 25 mm or more and 1500 gf / 25 mm or less, and the ratio (DMDT / DCDT) of the DMDT to the DCDT is 0.3 or more and 2.5 or less. The bending resistance in the MD direction and the CD direction of the kitchen towel sheet is each 4.5 mN or more and 22.0 mN or less, and the water absorption per unit area of the kitchen towel sheet is 330 g / m 2 or more and 600 g / m 2 or less. It is a kitchen towel roll characterized by this.

[0012] (2) The second aspect of the present invention is the kitchen towel roll described in (1), wherein the specific volume of the kitchen towel sheet is 7.6 cm 3 / g or more and 19.2 cm 3 / g or less. It is characterized by this.

[0013] (3) The third aspect of the present invention is the kitchen towel roll described in (1), wherein the embossed pattern is linear, and in the linear embossed pattern, the area occupied by embossings 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 50% or less of the area of the kitchen towel sheet. It is characterized by this.

[0014] (4) The fourth aspect of the present invention is the kitchen towel roll described in (1), wherein the depth of the embossings in the embossed pattern is 0.06 mm or more and 1.05 mm or less. It is characterized by this.

[0015] (5) A fifth aspect of the present invention is a kitchen towel roll as described in (1), characterized in that the kitchen towel sheet has a pattern of irregularities derived from a papermaking process that is different from the embossed pattern.

[0016] (6) A sixth aspect of the present invention is a kitchen towel roll as described in (1), characterized in that the paper thickness of the kitchen towel sheet is 1.3 mm / 10 plies or more and 5.0 mm / 10 plies or less.

[0017] (7) A seventh aspect of the present invention is a kitchen towel roll as described in (1), characterized in that the winding diameter of the roll is 85 mm or more and 180 mm or less.

[0018] (8) An eighth aspect of the present invention is a kitchen towel roll as described in (1), characterized in that the kitchen towel sheet has an elongation rate in the MD direction of 6% or more and 15% or less according to JIS P 8113.

[0019] (9) The ninth aspect of the present invention is a kitchen towel roll as described in (1), characterized in that the elongation rate of the kitchen towel sheet in the CD direction according to JIS P 8113 is 3% or more and 10% or less. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a kitchen towel roll that maintains a certain range of basis weight without excessively increasing it, and that is soft to the touch and firm while maintaining strength and water absorption. [Brief explanation of the drawing]

[0021] [Figure 1] This is a perspective view of a kitchen towel roll according to one embodiment of the present invention. [Figure 2] This figure shows a method for measuring the water absorption capacity of the kitchen towel sheet of the present invention. [Figure 3]This figure shows an example of an embossed pattern in the kitchen towel roll of the present invention. [Figure 4] This figure shows the height profile on the XY plane as measured by a microscope, indicated by varying shades of gray. [Figure 5] This figure shows the height profile on the XY plane as measured by a microscope. [Figure 6] This diagram shows how to determine the depth of an embossed pattern. [Figure 7] This figure shows a part of the papermaking process for the kitchen towel sheet of the present invention. [Modes for carrying out the invention]

[0022] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). This embodiment is illustrative for explaining the present invention and is not intended to limit the present invention to the following content. The present invention can be implemented by modifying it as appropriate within the scope of its gist.

[0023] Furthermore, in the context of kitchen towel sheets, the MD direction refers to the flow direction (Machine Direction) when the kitchen towel sheet is made from paper, while the CD direction refers to the direction perpendicular to the MD direction (Cross Direction).

[0024] <Kitchen towel roll> Figure 1 is a perspective view of a kitchen towel roll 1 according to one 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 in which two sheets of a two-ply material are laminated together by bonding sheets with an embossed pattern on one or both of them with glue, and the resulting two-ply kitchen towel sheet 1x is wound into a roll. Preferably, the kitchen towel sheet 1x has perforations in the roll width direction at approximately equal intervals in the roll winding direction (not shown). As shown in Figure 1, the surface of the kitchen towel sheet 1x facing outwards from the roll is referred to as surface 1a (the surface of the kitchen towel sheet 1x), and the surface facing towards the center of the roll is referred to as back surface 1b (the back surface of the kitchen towel sheet 1x). The edge of the kitchen towel sheet 1x is referred to as the outermost edge 1e of the kitchen towel roll 1.

[0025] Uses of kitchen towel roll 1 include, for example, rolls of kitchen paper (sometimes called paper towels, cooking paper, etc.) used in home kitchens and restaurant kitchens for wiping up moisture or oil and removing dirt, as well as rolls of other sanitary paper.

[0026] (Wind length and winding diameter) The length of the kitchen towel roll 1 is preferably 10m or more at the lower limit, more preferably 20m or more, and even more preferably 25m or more. The upper limit is preferably 50m or less, more preferably 40m or less, and even more preferably 35m or less. By keeping the length within the above numerical range, the roll diameter DR, described later, can be set to an appropriate range.

[0027] The roll length is measured as follows: First, measure the length of 10 sheets of kitchen towels between the perforations of kitchen towel roll 1. Then, measure the number of sheets in kitchen towel roll 1, and calculate the roll length proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80m and the number of sheets is 150, then 1.80m × (150 / 10) = 27m. If kitchen towel roll 1 does not have perforations, measure the roll length directly.

[0028] The winding diameter DR of the kitchen towel roll 1 according to this embodiment is preferably 85 mm or more and 180 mm or less. By having the winding diameter DR within the above numerical range, the kitchen towel roll 1 can be made to be soft to the touch and firm. The winding diameter DR is more preferably 100 mm or more and 170 mm or less, and even more preferably 130 mm or more and 160 mm or less.

[0029] The roll diameter DR is measured using a Diameter Rule manufactured by Muratec KDS Co., Ltd. Ten kitchen towel rolls are measured, and the results are averaged.

[0030] (Roll width and roll weight) The roll width of the kitchen towel roll 1 is preferably 170 mm or more at the lower limit, more preferably 185 mm or more, and even more preferably 195 mm or more. The upper limit is preferably 290 mm or less, more preferably 250 mm or less, and even more preferably 210 mm or less. By keeping the roll width within the above numerical range, it is possible to create a kitchen towel roll 1 that maintains a certain range for basis weight, strength, and water absorption.

[0031] Furthermore, the roll weight of the kitchen towel roll 1 is preferably 95g or more at the lower limit, more preferably 180g or more, and even more preferably 310g or more. The upper limit is preferably 470g or less, more preferably 430g or less, and even more preferably 370g or less. By keeping the roll weight within the above numerical range, it is possible to create a kitchen towel roll 1 that maintains a certain range for basis weight, strength, and water absorption.

[0032] The roll weight is defined as the weight per 280mm of roll width, excluding the core, for kitchen towel roll 1. If the roll width is not 280mm, the weight will be converted to a 280mm weight using proportional calculation.

[0033] (Roll density) The roll density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.04 g / cm³. 3 Preferably, it is 0.05 g / cm³ or more. 3 It is more preferable that the concentration be greater than or equal to 0.06 g / cm³. 3 It is even more preferable that the above is true. Also, the upper limit is 0.15 g / cm³. 3 Preferably, it is 0.13 g / cm³. 3 It is more preferable that the following is the case: 0.08 g / cm³ 3 It is even more preferable that the following conditions are met: By having a roll density within the above numerical range, a kitchen towel roll 1 can be made that is soft to the touch and firm.

[0034] Roll density is expressed as (roll weight) ÷ (roll volume). Roll weight is the weight of one kitchen towel roll per 280 mm roll width. Roll volume is expressed as [{cross-sectional area of ​​the outer diameter (winding diameter DR) portion of the roll} - (cross-sectional area of ​​the outer diameter DI portion of the core)] × roll width (converted to per 280 mm). For example, if the roll weight (excluding core) per 280 mm roll width is 382 g, the winding diameter DR is 150 mm, and the outer diameter DI of the core is 39 mm, then 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 / cm³ 3 This is the result.

[0035] (winding density) The winding density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.22 m / cm². 2 Preferably, it should be 0.25 m / cm 2 It is more preferable that it be greater than or equal to 0.28 m / cm 2 It is even more preferable that it be greater than or equal to the above. Also, the upper limit is 0.68 m / cm 2 Preferably, it is 0.54 m / cm 2 It is more preferable that the following is true: 0.40 m / cm 2It is even more preferable that the following conditions are met: By having a winding density within the above numerical range for the kitchen towel roll 1, the kitchen towel roll 1 can be made to be soft to the touch and firm.

[0036] 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) portion of the roll - (cross-sectional area of ​​the outer diameter DI portion of the core)}. For example, in the case of a winding length of 27m, 2 plies, winding diameter DR of 150mm, and core outer diameter DI of 39mm, winding density = (27m × 2) ÷ {3.14 × (150mm ÷ 2 ÷ 10)² - 3.14 × (39mm ÷ 2 ÷ 10)²} = 0.33 m / cm 2 This is the result.

[0037] (Core outer diameter) Furthermore, the core outer diameter DI of the kitchen towel roll 1 of the present invention is preferably 35 mm or more at the lower limit, more preferably 38 mm or more, and even more preferably 42 mm or more. The upper limit is preferably 50 mm or less, more preferably 48 mm or less, and even more preferably 46 mm or less. By having the core outer diameter DI within the above numerical range, the kitchen towel roll 1 can be made to be soft to the touch and firm.

[0038] The core outer diameter DI is measured using a Diameter Rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring 10 kitchen towel rolls and averaging the results. If the core does not have a core (paper tube), the outer diameter of the hollow core portion is measured.

[0039] <Kitchen towel sheets> (Basic weight) The basis weight of one ply of the kitchen towel sheet 1x according to this embodiment is 16 g / m². 2 More than 27g / m 2 The following applies: The basis weight per ply is 16 g / m². 2 If the weight is less than 27 g / m², the kitchen towel sheet will have poor absorbency. 2 Beyond that point, manufacturing costs increase. The basis weight of a 1x kitchen towel sheet can be measured according to JIS P 8124. The basis weight of one ply of a 1x kitchen towel sheet is 18 g / m². 2 More than 25g / m 2 Preferably, it is 20 g / m 2 More than 23g / m 2 The following is more preferable:

[0040] (paper thickness) The paper thickness of a kitchen towel sheet (1x) is preferably between 1.3mm / 10ply and 5.0mm / 10ply. If the paper thickness is less than 1.3mm / 10ply, the kitchen towel sheet (1x) will have inferior water absorption and firmness. If the paper thickness exceeds 5.0mm / 10ply, the manufacturing cost will increase. The paper thickness can be measured using a thickness gauge (the "PEACOCK" dial thickness gauge manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 37.85 gf / cm². 2 The measuring probe has a diameter of 30 mm. The sample is placed between the measuring probe and the measuring platform, and the gauge is read when the measuring probe is lowered at a speed of 1 mm or less per second. As the sample, 10 plies of a 1x kitchen towel sheet (5 sets of 2 plies) are used for measurement. The measurement is repeated 10 times at different locations, and the measurement results are averaged. The paper thickness of the 1x kitchen towel sheet is preferably 2.0 mm / 10 plies or more and 4.4 mm / 10 plies or less, and more preferably 2.6 mm / 10 plies or more and 3.8 mm / 10 plies or less.

[0041] (specific volume) The specific volume of one kitchen towel sheet is 7.6 cm³. 3 / g or more 19.2cm 3 It is preferable that the amount is less than or equal to / g. The specific volume of one kitchen towel sheet is 7.6 cm³. 3 If the weight is less than / g, the kitchen towel sheet 1x will be less soft. Also, the specific volume of the kitchen towel sheet 1x is 19.2cm³. 3 When the weight exceeds [amount], the kitchen towel sheet (1x) feels less firm. The specific volume of one kitchen towel sheet is 11.1 cm³. 3 / g or more 17.6cm 3 It is more preferable that it be less than or equal to / g, and 12.4cm 3 / g or more 16.5cm 3 It is even more preferable that it be less than or equal to / g. The specific volume is calculated by dividing the paper thickness per ply of a 1x kitchen towel sheet by the basis weight per ply, and the volume per unit (g) (cm³). 3 It is represented as ).

[0042] (DMDT, DCDT, and GMT) The dry machine direction tensile strength (DMDT) of a 1x kitchen towel sheet, according to JIS P 8113, is between 600 gf / 25 mm and 1500 gf / 25 mm. Furthermore, the Dry Cross Direction Tensile Strength (DCDT) of a 1x kitchen towel sheet, based on JIS P 8113, is between 600 gf / 25 mm and 1500 gf / 25 mm.

[0043] Furthermore, it is preferable that GMT, which is the square root of the product of DMDT and DCDT, be between 600 gf / 25 mm and 1500 gf / 25 mm. If the DMDT, DCDT, or GMT is less than 600gf / 25mm, the resulting kitchen towel sheet 1x will be less firm and tear-resistant. If the DMDT, DCDT, or GMT is more than 1500gf / 25mm, the resulting kitchen towel sheet 1x will be stiffer and less soft.

[0044] Furthermore, DMDT is preferably 720gf / 25mm to 1350gf / 25mm, and more preferably 800gf / 25mm to 1200gf / 25mm. Similarly, DCDT is preferably 720gf / 25mm to 1350gf / 25mm, and more preferably 800gf / 25mm to 1200gf / 25mm. Furthermore, the GMT is preferably 720gf / 25mm or more and 1350gf / 25mm or less, and more preferably 800gf / 25mm or more and 1200gf / 25mm or less.

[0045] Furthermore, the ratio of DMDT to DCDT (DMDT / DCDT) is between 0.3 and 2.5. If the ratio is less than 0.3, the DMDT remains within a certain range while the DCDT is high, resulting in a less soft kitchen towel sheet (1x). If the ratio exceeds 2.5, the DCDT remains within a certain range while the DMDT is high, resulting in a less soft kitchen towel sheet (1x). Furthermore, the ratio of DMDT to DCDT (DMDT / DCDT) is preferably 0.5 to 1.5, and more preferably 0.7 to 1.3. The DMDT and DCDT of one kitchen towel sheet are measured in accordance with JIS P 8113, and the ratio (DMDT / DCDT) is calculated from the measured DMDT and DCDT. Furthermore, GMT is calculated from the square root of the product of the measured DMDT and DCDT.

[0046] (WMDT and WCDT) The Wet Machine Direction Tensile Strength (WMDT) of a kitchen towel sheet 1x, based on the old JIS S 3104 (1999), is preferably 190 gf / 25 mm or more and 540 gf / 25 mm or less. Furthermore, the wet cross-direction tensile strength (WCDT) of the kitchen towel sheet 1x, based on the old JIS S 3104 (1999), is preferably 190 gf / 25 mm or more and 540 gf / 25 mm or less.

[0047] If the WMDT is less than 190gf / 25mm or the WCDT is less than 190gf / 25mm, the 1x kitchen towel sheet will be less firm and tear-resistant. If the WMDT is greater than 540gf / 25mm or the WCDT is greater than 540gf / 25mm, the 1x kitchen towel sheet will be less soft as a result.

[0048] Furthermore, the WMDT is more preferably 240gf / 25mm to 480gf / 25mm, and even more preferably 270gf / 25mm to 430gf / 25mm. Similarly, the WCDT is more preferably 240gf / 25mm to 480gf / 25mm, and even more preferably 270gf / 25mm to 430gf / 25mm.

[0049] Furthermore, the ratio of WMDT to WCDT (WMDT / WCDT) is preferably between 0.3 and 2.5. If the ratio is less than 0.3, WMDT will remain within a certain range while WCDT will be high, resulting in a kitchen towel sheet 1x that is less soft, or WMDT will be low, resulting in a kitchen towel sheet 1x that is less firm and tear-resistant. If the ratio exceeds 2.5, WCDT will remain within a certain range while WMDT will be high, resulting in a kitchen towel sheet 1x that is less soft, or WCDT will be low, resulting in a kitchen towel sheet 1x that is less firm and tear-resistant. Furthermore, the ratio of WMDT to WCDT (WMDT / WCDT) is more preferably 0.5 or more and 1.5 or less, and even more preferably 0.7 or more and 1.3 or less. The WMDT and WCDT of a kitchen towel sheet (1x) are measured in accordance with the old JIS S 3104 (1999).

[0050] (Growth rate) Furthermore, it is preferable that the elongation rate of the kitchen towel sheet 1x in the MD direction, based on JIS P 8113, be between 6% and 15%. If the elongation rate of the kitchen towel sheet 1x in the MD direction is less than 6%, the kitchen towel sheet 1x will be hard and lack softness. Also, if the elongation rate of the kitchen towel sheet 1x in the MD direction exceeds 15%, the kitchen towel sheet 1x will lack firmness. Furthermore, the elongation rate of the kitchen towel sheet 1x in the MD direction is more preferably 7% to 12%, and even more preferably 8% to 9%.

[0051] Furthermore, it is preferable that the elongation rate of the kitchen towel sheet 1x in the CD direction, according to JIS P 8113, be between 3% and 10%. If the elongation rate of the kitchen towel sheet 1x in the CD direction is less than 3%, the kitchen towel sheet 1x will be hard and lack softness. Also, if the elongation rate of the kitchen towel sheet 1x in the CD direction exceeds 10%, the kitchen towel sheet 1x will lack firmness. Furthermore, the elongation rate of the kitchen towel sheet 1x in the CD direction is more preferably 4% to 8%, and even more preferably 5% to 6%. The elongation rate in each direction of a kitchen towel sheet 1x can be measured in accordance with the method described in JIS P 8113.

[0052] (Bending resistance) The bending resistance of kitchen towel sheet 1x in both the MD and CD directions is between 4.5 mN and 22.0 mN. If the bending resistance of kitchen towel sheet 1x in either the MD or CD direction is less than 4.5 mN, the basis weight and strength of kitchen towel sheet 1x will be lower, resulting in a less firm feel and less tear resistance. Also, if the bending resistance of kitchen towel sheet 1x in either the MD or CD direction exceeds 22.0 mN, kitchen towel sheet 1x will become stiff and less soft. Furthermore, the bending resistance of the kitchen towel sheet 1x in the MD direction and the CD direction is preferably 7.5 mN or more and 17.5 mN or less, and more preferably 10.5 mN or more and 15.5 mN or less.

[0053] The bending resistance of a 1x kitchen towel sheet in each direction can be measured using an L&W bending tester (Lorentzen & Wettre) in accordance with the method described in JIS P 8125-1:2017 (ISO 2493). For a test specimen of a 1x kitchen towel sheet with a width of 38 mm and a length of 100 mm, the measured values ​​in each direction with a bending angle of 15 degrees and a bending length (span of the sample stage) of 10 mm are defined as the bending resistance (load). The above measurements are performed in both the MD direction and the CD direction. If the perforations on the sheet are too close together to obtain a 100mm long test specimen, the length of the test specimen can be shortened.

[0054] (Water absorption) In this invention, the water absorption capacity per unit area of ​​a kitchen towel sheet 1x is 330 g / m². 2 More than 600g / m 2 The following is true: Water absorption per unit area is 330 g / m². 2 If the value is less than 600 g / m², the kitchen towel sheet 1x will have poor water absorption. 2 If it exceeds a certain amount, the basis weight of a 1x kitchen towel sheet increases, and the cost goes up. The water absorption capacity per unit area of ​​one kitchen towel sheet is 400g / m². 2 More than 500g / m 2 Preferably, it is 420 g / m². 2 More than 460g / m 2 The following is more preferable:

[0055] Furthermore, the water absorption capacity per unit weight of a kitchen towel sheet 1x is preferably 6g / g or more and 18g / g or less. If the water absorption capacity per unit weight is less than 6g / g, the kitchen towel sheet 1x will have poor water absorption. If the water absorption capacity per unit weight exceeds 18g / g, the amount of water absorbed per sheet will be unnecessarily high. Furthermore, the water absorption per unit weight is more preferably 8 g / g or more and 15 g / g or less, and even more preferably 10 g / g or more and 13 g / g or less.

[0056] The method for measuring the water absorption capacity of each kitchen towel sheet 1x is explained below, with reference to Figure 2. First, take a 2-ply stacked kitchen towel sheet (1x) and cut it using a 7.6cm (3-inch) square template to create a rectangular test piece (10) with sides of 7.6cm. Measure the weight of the test piece (10) before water absorption using an electronic balance. Set the test piece (10) in a holder (12) (a jig that secures the test piece at three points; the jig is made of a metal that does not absorb moisture).

[0057] Next, fill a commercially available tray with distilled water to a depth of 2 cm, and immerse the test piece 10, which is set in the holder 12, in the distilled water for 2 minutes. After 2 minutes of immersion, remove the test piece 10 and the holder 12 from the distilled water, and attach the strip 11 to one corner 10d of the test piece 10, as shown in Figure 2. The strip 11 is made by peeling the same kitchen towel as the two plies to be measured into one ply, cutting the single ply of paper kitchen towel to a size of 2 mm x 15 mm, and attaching it to the part of the test piece 10 6 mm from the corner 10d toward the center. Next, suspend the holder 12 and the test piece 10 from a rod placed in an empty water tank with the corner 10a opposite to corner 10d facing upwards, close the lid of the water tank, and leave it for 15 minutes.

[0058] Afterward, the holder 12 and test piece 10 are removed from the water bath, the band 11 and holder 12 are removed, and the weight of the test piece 10 is measured using an electronic balance. From the change in weight of the test piece 10 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 10 (water g / sheet m) is determined. 2 , 1m 2Correct. Abbreviated as g / m 2 Calculate the amount of water absorbed per unit area (water g / sheet m). 2 By dividing this by the basis weight of the product ply of test piece 10, the water absorption per unit area (water g / sheet m) can be calculated. 2 ) / Basis weight (sheet g / sheet m 2 ) = Calculate the amount of water absorbed per unit weight (water g / sheet g, per gram; abbreviated as g / g). Measurements are taken 5 times for each sample, and the average value is used. This measurement will be performed according to the JIS P 8111 method, under conditions of 23±1°C and 50±2% humidity. Distilled water will also be maintained at 23±1°C.

[0059] (Embossed) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an embossed pattern. Furthermore, the kitchen towel sheet 1x in the present invention is made by embossing one or both of two ply sheets and then laminating them to form a two-ply sheet. When laminating the two ply sheets, plybond glue (adhesive) is used and the glue is applied to bond the sheets together. By bonding the sheets together in this way to form a two-ply sheet, the adhesion between the ply sheets is strengthened, and the kitchen towel sheet 1x becomes less likely to tear and the ply sheets will not peel off even when wet. Furthermore, it is preferable that the embossing is applied to one of the two-ply sheets, and more preferably to the surface ply 1a of the two-ply sheet.

[0060] As described above, it is preferable that the plies of the surface 1a of the kitchen towel sheet 1x have an embossed pattern. By applying an embossed pattern to the surface 1a, glue can be applied to the embossed parts of the embossed pattern for adhesion treatment, which makes it less likely for the plies of the kitchen towel sheet 1x to peel off and allows the amount of water absorbed to be kept within a certain range. The embossed pattern is not particularly limited as long as it is a pattern commonly applied to kitchen towels, such as dots or lines, but a linear embossed pattern is preferred. Specifically, the linear embossed pattern is not particularly limited as long as it is a pattern that includes two of each of two types of figures, such as the approximately circular shape with another pattern inside, and a figure that is approximately symmetrical vertically and horizontally and includes a combination of multiple curves and figures, as shown in Figure 3. For the approximately circular shape, it is preferable that the approximately circular shape is doubled.

[0061] Furthermore, regarding the dimensions of the embossed pattern, it is preferable that the rectangle E (E is not the embossed pattern) surrounding the embossed pattern is a square with sides of 2 cm to 25 cm, more preferably a square with sides of 5 cm to 20 cm, and even more preferably a square with sides of 8 cm to 15 cm. For this rectangle 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 also be tilted. By using such a pattern, the water absorption capacity can be improved in a kitchen towel sheet 1x with high water absorption capacity like the present invention, the ply is less likely to peel off, and strength can be maintained, resulting in a firm feel.

[0062] In this case, it is preferable that the area occupied by the linear embossed pattern, which has a thickness of 0.1 mm to 4 mm and a length of 5 mm or more, is between 4% and 50% of the area of ​​the kitchen towel sheet 1x. If the percentage is less than 4%, the kitchen towel sheet 1x will lack firmness and be easily torn. If the percentage exceeds 50%, the kitchen towel sheet 1x will lack softness. The above area ratio is calculated by taking the inside of a rectangle E that contains the entirety of one embossed pattern as shown in Figure 3, and measuring the total length of the embossed areas that are 0.1 mm to 4 mm thick and 5 mm or longer, and calculating the area of ​​the emboss as total length (mm) × width (mm). The area of ​​one sheet of kitchen towel sheet 1x is (sheet length × sheet width), and the ratio is calculated as (area of ​​embossed area / area of ​​one sheet of kitchen towel sheet 1x) × 100 (%).

[0063] The size of one side of rectangle E can be appropriately changed depending on the size of the embossed pattern. Furthermore, if an embossed pattern adjacent to an embossed pattern contained within a rectangle that encompasses all of the embossed patterns, the length of that adjacent embossed pattern should also be measured and included in the total length. If the size of one side of rectangle E cannot be clearly determined by the embossed pattern, the size of rectangle E should be set to 10 × 10 cm, and the total length of the embossed patterns contained within this rectangle should be measured. The total length should be determined by measuring with a ruler, measuring tape, etc., using the method described above. If visual inspection of the embossing is difficult, a general microscope may be used for measurement. Furthermore, it is more preferable that the area occupied by the linear embossing pattern, where the thickness is 0.1 mm or more and the length is 5 mm or more, is 6% or more and 35% or less of the area of ​​1x kitchen towel sheet, and even more preferable that it is 9% or more and 16% or less.

[0064] In the embossed pattern, the embossing depth is preferably between 0.06 mm and 1.05 mm. If the embossing depth is less than 0.06 mm, the kitchen towel sheet 1x will be less soft. If the depth exceeds 1.05 mm, the kitchen towel sheet 1x will be less firm and tear-resistant. Furthermore, the depth of the embossing in the embossed pattern is more preferably 0.10 mm or more and 0.55 mm or less, and even more preferably 0.14 mm or more and 0.35 mm or less.

[0065] The depth of the embossing is measured using a microscope. The KEYENCE VR-3100 One-Shot 3D Measurement Macroscope can be used. The VR-H1A software can be used for observing, measuring, and analyzing the microscope images. The measurement conditions are 25x magnification and a field of view of 12mm x 9mm. The magnification and field of view may be adjusted as needed depending on the desired embossing size.

[0066] Figure 4 shows the height profile on the XY plane obtained by a microscope, with the height of the surface of the kitchen towel sheet 1x represented by shades of gray. Linear areas in Figure 4 with different shades from the surrounding areas indicate individual embossing. The depth of the embossing is determined by measuring the height difference of the embossing using the microscope described above. The measurement is performed on the surface 1a side of the kitchen towel sheet 1x. In addition, three turns of kitchen towel sheet 1x are removed from the kitchen towel roll 1, and the measurement is taken using the fourth turn of kitchen towel sheet 1x in a 2-ply sheet state. If there are perforations, they are avoided during measurement. First, draw line segment AB as shown in Figure 4 to obtain the height profile in Figure 5. Note that line segment AB should be drawn across the embossing. Line segment AB should be drawn in the width direction (CD direction) of the kitchen towel sheet 1x, but if the spacing between embossings is narrow, for example, 2 mm or less, and the height of the raised parts below becomes low, the line segment may be drawn diagonally or in the direction of flow (MD direction). The height profile in Figure 5 is the (measured) cross-sectional curve S that represents the surface irregularities of the actual kitchen towel sheet 1x sample, but it also contains noise (steep peaks caused by fiber clumps on the surface of the kitchen towel sheet 1x, fibers extending in a whisker-like manner, or areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the irregularities.

[0067] Therefore, the (measured) cross-sectional curve S in Figure 5 is smoothed with a weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 6. Note that smoothing using the weighted average radio button filter can be obtained automatically using the analysis software mentioned above. Then, in the graph shown in Figure 6, the average of the maximum values ​​on the vertical axis of the convex part H1 and the convex part H2 adjacent to convex part H1 is calculated, and the minimum value on the vertical axis at the concave part D1 sandwiched between convex parts H1 and H2 is found. The value obtained by subtracting the minimum value from the average of the maximum values ​​obtained in this way is taken as the provisional embossing depth. Then, as shown in Figure 6, the same measurement is performed at a total of two consecutive locations on the cross-sectional curve (a total of two consecutive locations: the concave part D1 and the concave part D2 sandwiched between convex parts H3 and H4) (at this point, two measurement results are obtained). Subsequently, the kitchen towel roll 1 is rotated 90 degrees three times in the flow direction of the kitchen towel sheet 1x, and the same measurements as above are taken at each position (a total of 4 measurement positions in the flow direction). The average value of these 8 positions (2 x 4) is then adopted as the embossing depth. Furthermore, since the kitchen towel sheet 1x of the present invention has a pattern of irregularities derived from the papermaking process, which differs from the embossed pattern, variations in the height of the convex parts on either side of the recess are observed. Therefore, if the difference in the vertical axis values ​​between the convex parts flanking the recess (for example, convex parts H3 and H4 flanking the recess D2) is 0.2 mm or more, measurements should be taken at locations that avoid that area.

[0068] <Manufacturing method for kitchen towel roll packaging> Kitchen towel roll 1 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing and bonding, and (3) roll winding. In the manufacturing (papermaking) process of kitchen towel sheet 1x, it is preferable to use TAD papermaking technology.

[0069] In this case, it is preferable that a pattern of unevenness originating from the papermaking process (fabric), different from the embossing pattern described above, is applied to the kitchen towel sheet 1x during the papermaking process. Having this uneven pattern further increases the water absorption capacity of the kitchen towel sheet 1x. Furthermore, "originating from the papermaking process" means that in the papermaking process for kitchen towel sheets 1x, a pattern of irregularities is applied between the headbox of the papermaking machine and the outlet of the Yankee dryer 22. Specifically, in a part of the papermaking process shown in Figure 7, the irregularities can be applied by the belt press section 20, which is located between the dewatering roll 21 and the Yankee dryer 22. In the belt press section 20, the wet paper 24 and the irregularity belt 23 (the irregularity belt 23 loops between the belt press section 20 and the Yankee dryer 22) are pressed together to apply a pattern of irregularities to the wet paper 24.

[0070] Furthermore, the pattern of the unevenness can be changed as needed by altering the fabric pattern (fine pattern, coarse pattern). Changing the pattern of the unevenness will change the specific volume (paper thickness), but it is preferable to select a pattern such that the specific volume in the roll state falls within the numerical range described above.

[0071] As described above, according to this embodiment, it is possible to provide a kitchen towel roll that maintains a certain range without excessively increasing the basis weight, and that is soft to the touch and firm while maintaining strength and water absorption. [Examples]

[0072] The present invention will be described in more detail below with reference to examples, but the present invention is not limited in any way by the following examples.

[0073] Kitchen towel rolls for Examples 1 to 18 and Comparative Examples 1 to 6, as shown in Tables 1 and 2, were manufactured through the following processes: (1) papermaking and creping, (2) embossing and bonding, and (3) roll winding. The above parameters were measured for all kitchen towel roll packaging for the Examples and Comparative Examples, and the following evaluations were performed. For parameters other than those evaluated below, the above criteria or measurement methods were followed.

[0074] 1. Basis weight (cost) The basis weight of each ply of the kitchen towel sheets after manufacturing was measured and evaluated on a four-point scale. The evaluation criteria are as follows: ◎: 23g / m 2 When ○: 23g / m 2 Higher, 25g / m 2 When △: 25g / m 2 Higher, 27g / m 2 When ×: 27g / m 2 When it is higher

[0075] 2. Firmness (firmness and resilience of the seat) Twenty monitors conducted a sensory evaluation of the firmness of the kitchen towel sheets after manufacturing, and rated them on a 5-point scale based on the number of people who felt the sheets lacked firmness and resilience. The evaluation criteria were as follows: ◎: 0-3 people felt that the seat lacked firmness and resilience. ○: 4-7 people felt that the seat lacked firmness and resilience. △: 8-10 people felt that the seat lacked firmness and resilience. ×: 11-15 people felt that the seat lacked firmness and resilience. ××: More than 16 people felt that the seats lacked firmness and resilience.

[0076] 3. Softness The softness of the kitchen towel sheets after manufacturing was evaluated by 20 monitors, and rated on a 5-point scale based on the number of people who felt the sheets were "hard." The evaluation criteria were as follows: ◎: 0-3 people felt the seats were too hard. ○: 4-7 people felt the seats were too hard. △: 8-10 people felt the seats were too hard. ×: 11-15 people felt the seats were too hard. ××: More than 16 people felt the seats were too hard.

[0077] 4.Water absorption The water absorption capacity per unit area of ​​the kitchen towel sheets after manufacturing was measured and evaluated on a four-point scale. The evaluation criteria are as follows: ◎: 420g / m 2 In the above cases ○: 400g / m 2 More than 420g / m 2 When less than △: 330g / m 2 More than 400g / m 2 When less than ×: 330g / m 2 When less than

[0078] 5. Tear resistance The tear resistance of kitchen towel sheets after wiping away dirt was evaluated by 20 monitors, and the number of people who felt the sheets tore easily was used to rate them on a 5-point scale. The evaluation criteria were as follows: ◎: 0-3 people felt the sheet was easily torn. ○: 4-7 people felt that the sheet was easily torn. △: 8-10 people felt that the sheet was easily torn. ×: 11-15 people felt the sheet was easily torn. ××: More than 16 people felt that the sheet was easily torn.

[0079] Tables 1 and 2 show the conditions and evaluation results for each example. [Table 1]

[0080] [Table 2]

[0081] Based on the above, it has been confirmed that this embodiment allows for the production of kitchen towel rolls that maintain a certain basis weight without excessively increasing it, while also maintaining strength and water absorption, and that are soft to the touch and firm. [Explanation of Symbols]

[0082] 1 Kitchen towel roll 1a surface 1b back side 1e The outermost edge of the kitchen towel roll 1x Kitchen Towel Sheet 10 test specimens 10a,10d corner 11 obi 12 holders 20 Belt press section 21 Dehydration Roll 22 Yankee Hair Dryer 23. Uneven belt 24 Wet paper

Claims

1. A kitchen towel roll is formed by laminating two sheets of paper together, with one or both of the two plies having an embossed pattern, using glue, and then winding the resulting roll into a roll shape. The basis weight of one ply of the aforementioned kitchen towel sheet is 16 g / m². ２ More than 27g / m ２ The following: In the aforementioned kitchen towel sheet, the tensile strength DMDT in the MD direction and the tensile strength DCDT in the CD direction when dry, based on JIS P 8113, are both 600 gf / 25 mm or more and 1500 gf / 25 mm or less, and the ratio of DMDT to DCDT (DMDT / DCDT) is 0.3 or more and 2.5 or less. The bending resistance of the aforementioned kitchen towel sheet in the MD direction and the CD direction is 4.5 mN or more and 22.0 mN or less. The water absorption capacity per unit area of ​​the aforementioned kitchen towel sheet is 330 g / m². ２ 600g / m or more ２ A kitchen towel roll characterized by the following:

2. The specific volume of the aforementioned kitchen towel sheet is 7.6 cm³. ３ / g or more 19.2cm ３ The kitchen towel roll according to claim 1, characterized in that it is less than or equal to / g.

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

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

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

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

7. The kitchen towel roll according to claim 1, characterized in that the roll has a winding diameter of 85 mm or more and 180 mm or less.

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

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

Images