Method of producing kitchen towel roll

Abstract

To provide a method of producing a kitchen towel roll with a few paper breakages in a paper-making process, hardly staining inside of the system, excellent in operability, and hardly breaking a sheet while keeping the feeling and water absorbency of the sheet.SOLUTION: There is provided a method of producing a kitchen towel roll formed by winding a kitchen towel sheet made by using a TAD papermaking machine, in which the vertical distance from the maximum value to the minimum value of the height of unevenness of the fabric is 0.40 mm or more and 0.90 mm or less, the warp yarn diameter is 0.20 mm or more and 0.65 mm or less, the weft yarn diameter is 0.40 mm or more and 0.90 mm or less, the mesh thickness is 1.00 mm or more and 1.90 mm or less, the J / W ratio is 1.02 or more and 1.12 or less, the basis weight per ply of base paper is 18.0 g / m2 or more and 29.0 g / m2 or less, DMDT / DCDT is 0.78 or more and 2.70 or less, and TS750 of the kitchen towel sheet is 50 dBV2rms or more and 110 dBV2rms or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for making a kitchen towel roll. [Background technology]

[0002] Various types of kitchen towel sheets and kitchen towel rolls made by rolling up sheets have been developed and are on sale.

[0003] In recent years, kitchen towel rolls have become longer, but in addition to longer lengths, high-quality products also require quality such as texture and tear resistance.

[0004] Among high-end products, kitchen towel sheets made using the so-called TAD (Through Air Dryer, also known as Through Air Drying) papermaking technology, which uses air drying, are thick, soft to the touch, and have excellent water absorbency.

[0005] However, kitchen towel sheets made using TAD papermaking technology have uneven surfaces and are bulky, resulting in little inter-fiber bonding and low strength. Furthermore, like other paper products, if the paper is manufactured so that flow occurs in the direction of the pulp fibers (to create an aspect ratio), the strength in the CD direction will be even lower, making the paper more prone to tearing and resulting in a product of inferior quality.

[0006] Possible measures to prevent this decrease in strength in the CD direction include: 1. increasing the basis weight, 2. strengthening the beating of the pulp, 3. adding strength agents, and 4. bringing the ratio of longitudinal and transverse tensile strengths (DMDT / DCDT) closer to 1.0. However, if measures 1 to 3 are taken more than necessary, the following problems will arise: 1. costs will increase, 2. the pulp's FPR (first pass retention: the retention of fibers and chemicals, also known as the primary retention rate) will decrease and the concentration of fine fibers in the white water will increase, resulting in the fine fibers and chemicals that have adhered to the fine fibers circulating through the papermaking process, making the system more susceptible to contamination (if the system becomes contaminated, the papermaking machine will have to be stopped for cleaning, reducing operability), and 3. the chemical FPR will decrease and the chemical concentration in the white water will increase, making the system more susceptible to contamination (reducing operability).

[0007] Therefore, the most effective way to prevent a decrease in strength in the CD direction is to set the tensile strength ratio (DMDT / DCDT) to an appropriate value.

[0008] As a prior art document relating to TAD papermaking technology, for example, Patent Document 1 discloses a through-air drying papermaking apparatus having a twin fabric forming section, a water removal section arranged downstream of the forming section, and a web transfer device arranged between the forming section and the water removal section, wherein the forming section has a forming roll, a pair of fabrics guided to run on a portion of the circumference of the forming roll, and a headbox that operates to deposit slurry between the fabrics so as to form a paper web between the fabrics, and preferably one of the fabrics in the forming section comprises a through-air drying (TAD) fabric arranged to transport the paper web through the water removal section, and the other fabric comprises a forming wire. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Special Publication No. 2003-517117 Summary of the Invention [Problem to be solved by the invention]

[0010] In ordinary paper products, the jet speed / wire speed ratio (hereinafter also referred to as the J / W ratio), which is the ratio of the speed of the jet that ejects the slurry to the speed of the wire (fabric) that transports the slurry, is adjusted to bring the longitudinal and transverse tensile strength ratio closer to 1.0. In products with a longitudinal and transverse tensile strength ratio, a pulled formation is achieved by making the J / W ratio less than 1.0 (i.e., slowing the pulp slurry ejection speed relative to the fabric speed), which results in a flow of fibers that creates a longitudinal and transverse tensile strength ratio.

[0011] Furthermore, since the fabric is flat in the conventional papermaking technology, DCT (Dry Crepe Tissue), by setting the J / W ratio to 1.0 (i.e., fabric speed = slurry ejection speed), the longitudinal and transverse tensile strength ratio approaches 1.0.

[0012] However, in the TAD papermaking method, the fabric has unevenness, so when the J / W ratio is 1.0, the uneven structure affects the direction of the fibers, making it difficult to achieve a tensile strength ratio of 1.0 in the longitudinal and transverse directions. As a result, when poor drying occurs, small holes are formed across the width of the base paper due to the weak strength in the CD direction, making the paper more susceptible to breakage, resulting in a problem of reduced operability.

[0013] The present invention has been made in view of the above circumstances, and aims to provide a method for producing a kitchen towel roll that reduces paper breakage during the papermaking process, is less likely to contaminate the system, has excellent operability, and produces a sheet that is resistant to tearing while maintaining its texture and water absorbency. [Means for solving the problem]

[0014] The inventors conducted extensive research and found that in a method for producing a kitchen towel roll by imparting an embossed pattern to base paper made using a TAD paper machine and laminating the resulting two- or three-ply kitchen towel sheet into a roll, by setting the vertical distance from the maximum height to the minimum height of the irregularities in the fabric used, the warp diameter, weft diameter, and mesh thickness, and the ratio of slurry jet speed to fabric speed (J / W ratio) within predetermined ranges, and also setting the basis weight and DMDT / DCDT ratio of the base paper within predetermined ranges, and further setting the TS750 of the kitchen towel sheet within predetermined ranges, a kitchen towel roll can be produced that has fewer paper breaks in the papermaking process, is less likely to stain the system, is excellent in operability, and is resistant to tearing while maintaining its texture and water absorbency, thereby solving the above-mentioned problems and leading to the completion of the present invention.

[0015] (1) The first aspect of the present invention is a method for producing a kitchen towel roll by imparting an embossed pattern to a base paper made using a TAD paper machine, laminating the base paper in two or three plies, and winding the resulting kitchen towel sheet into a roll, wherein the vertical distance from the maximum height value to the minimum height value of the irregularities of the fabric used in the papermaking process using the TAD paper machine is 0.40 mm or more and 0.90 mm or less, the warp diameter is 0.20 mm or more and 0.65 mm or less, the weft diameter is 0.40 mm or more and 0.90 mm or less, the mesh thickness is 1.00 mm or more and 1.90 mm or less, the ratio of slurry jet speed to fabric speed (J / W ratio) is 1.02 or more and 1.12 or less, and the basis weight per ply of the base paper is 18.0 g / m 2 More than 29.0g / m 2The ratio of the tensile strength in the MD direction per two plies when dry (DMDT) to the tensile strength in the CD direction per two plies when dry (DCDT) (DMDT / DCDT) is 0.78 or more and 2.70 or less, and when a tissue softness analyzer (TSA) is used to measure the vibration of the sample stage, a bladed rotor is pressed from above with a pressure of 100 mN onto a sample of the kitchen towel sheet placed on a sample stage, and the sample stage is rotated at a rotation speed of 2.0 / sec., the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), automatically acquired by the software on the TSA, is 50 dBV or less. 2 rms over 110dBV 2 This is a method for producing a kitchen towel roll, characterized in that the rolling resistance is rms or less.

[0016] (2) A second aspect of the present invention is a method for manufacturing a kitchen towel roll as described in (1), characterized in that in the papermaking process using the TAD papermaking machine, the papermaking speed is 600 m / min or more and 1400 m / min or less.

[0017] (3) A third aspect of the present invention is a method for manufacturing a kitchen towel roll as described in (1), characterized in that in the papermaking process using the TAD papermaking machine, the first pass retention is 50% or more and 98% or less.

[0018] (4) A fourth aspect of the present invention is a method for producing a kitchen towel roll according to (1), wherein the water absorption per unit area of ​​two plies of the kitchen towel sheet is 300 g / m 2 More than 650g / m 2 It is characterized by the following:

[0019] (5) A fifth aspect of the present invention is the method for producing a kitchen towel roll according to (1), wherein the specific volume of the kitchen towel sheet is 7 cm 3 / g or more 23cm 3 / g or less.

[0020] (6) A sixth aspect of the present invention is a method for manufacturing a kitchen towel roll according to (1), characterized in that the paper thickness of the kitchen towel sheet is 2.1 mm / 10 plies or more and 4.1 mm / 10 plies or less.

[0021] (7) A seventh aspect of the present invention is a method for manufacturing a kitchen towel roll according to (1), characterized in that the kitchen towel sheet has a pattern of protrusions and recesses resulting from the papermaking process that is different from the embossed pattern.

[0022] (8) The eighth aspect of the present invention is the method for producing a kitchen towel roll according to (1), wherein the basis weight per ply of the kitchen towel sheet is 17.6 g / m 2 More than 30.0g / m 2 It is characterized by the following:

[0023] (9) A ninth aspect of the present invention is the method for manufacturing a kitchen towel roll according to (1), characterized in that the tensile strength DMDT of the kitchen towel sheet in the MD direction per 2-ply or 3-ply when dry is 1146 cN / 76 mm or more and 5733 cN / 76 mm or less.

[0024] (10) A tenth aspect of the present invention is the method for manufacturing a kitchen towel roll according to (1), characterized in that the tensile strength (DCDT) in the CD direction of the kitchen towel sheet per 2-ply or 3-ply when dry is 1766 cN / 76 mm or more and 5128 cN / 76 mm or less.

[0025] (11) An eleventh aspect of the present invention is the method for manufacturing a kitchen towel roll according to (1), characterized in that the water absorption per unit mass of two plies of the kitchen towel sheet is 8 g / g or more and 20 g / g or less. [Effects of the Invention]

[0026] According to the present invention, it is possible to provide a method for producing a kitchen towel roll in which there is little paper breakage during the papermaking process, the system is less likely to become dirty, and operability is excellent, and the sheet is less likely to tear while maintaining its texture and water absorbency. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic diagram of a TAD paper machine used in a method for producing a kitchen towel roll according to one embodiment of the present invention. [Figure 2] This is an enlarged view of the fabric surface on the XY plane taken with a microscope, of a fabric used in a TAD paper machine. [Figure 3] FIG. 1 is a graph showing a height profile on the XY plane obtained by a microscope. [Figure 4] FIG. 1 is a diagram showing how to determine the warp and weft diameters of a fabric used in a TAD paper machine. [Figure 5] 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Figure 6] FIG. 1 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the present invention. [Figure 7] FIG. 1 is a diagram showing an example of an embossing pattern in a kitchen towel roll of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be practiced by appropriately modifying it within the scope of its gist.

[0029] Furthermore, the MD direction of the kitchen towel sheet is the machine direction in which the kitchen towel sheet is made, and the CD direction is the direction perpendicular to the MD direction (cross direction).

[0030] <Kitchen towel roll manufacturing method> The manufacturing method of a kitchen towel roll 1 according to one embodiment of the present invention involves applying an embossed pattern to base paper made using a TAD papermaking machine, laminating the base paper in two or three plies, and winding the resulting kitchen towel sheet 1x into a roll. The papermaking process using a TAD papermaking machine will be described below.

[0031] 1 shows one embodiment of a papermaking apparatus including a TAD papermaking machine, a feature of the present invention. The papermaking apparatus 110 generally includes a twin fabric forming section 120, a water removal section 140, and a web transfer device 160 disposed between the twin fabric forming section 120 and the water removal section 140.

[0032] First, pulp slurry (hereinafter also referred to as paper stock) ejected from a head box 128 is deposited between the fabrics 124 and 126 , and the paper web 105 is formed by the forming roll 122 .

[0033] Next, the paper web 105 is sent to a dewatering section 170 by fabrics 124 and 126 formed into a continuous loop by a number of guide rolls 130 , and is semi-dewatered by a vacuum (reduced pressure) dewatering device 172 . Either or both of the fabrics 124 and 126 may be wire.

[0034] The paper web 105 is then fed by the fabric 126 and the web transport device 160 to the web imprinting device 180. The web imprinting device 180 is a suction device, such as a multi-slot suction box, that in addition to imprinting the paper web 105, can also force the unsupported portions of the paper web 105 into the holes of the fabric 126 to further dewater the paper web 105.

[0035] The paper web 105 is then sent by the fabric 126 to through-air dryers (TAD) 142a and 142b, which are the first half of the water removal section 140. The through-air dryers 142a and 142b have porous cylinders 144a and 144b and hoods 146a and 146b, respectively, and the paper web 105 is continuously dried by passing through these through-air dryers 142a and 142b. It is to be noted that only one of the through-air dryers 142a and 142b may be provided.

[0036] Finally, the paper web 105 is sent by the fabric 126 and press roll 132 to the Yankee dryer 150, which is the latter half of the water removal section 140. The paper web 105 is finally dried by the Yankee dryer 150, which has a hood 154, and then creped by a doctor blade 152. The base paper that has undergone the above papermaking processes is then sent to the embossing process and lamination process. Although the hoods 146a and 146b of the through-air dryers 142a and 142b and the hood 154 of the Yankee dryer 150 are arranged in opposite directions in the vertical direction in the papermaking apparatus 110 of Figure 1, they may also be arranged in the same direction.

[0037] In this case, in the papermaking process using the TAD papermaking machine (papermaking apparatus 110), the vertical distance from the maximum height to the minimum height of the unevenness of the fabrics 124 and 126 used is 0.40 mm or more and 0.90 mm or less. If the vertical distance is less than 0.40 mm, the resulting kitchen towel sheet 1x will have a low paper thickness and poor absorbency. If the vertical distance exceeds 0.90 mm, the paper web 105 will be too thick, making it difficult to dry and causing small holes, resulting in a high tendency for the paper to break and poor operability. The vertical distance from the maximum height value to the minimum height value of the irregularities is preferably 0.50 mm or more, more preferably 0.55 mm or more, and is preferably 0.85 mm or less, more preferably 0.70 mm or less.

[0038] The vertical distance from the maximum height value to the minimum height value of the unevenness of fabrics 124 and 126 is determined by measuring the height difference of the unevenness of fabrics 124 and 126 (hereinafter referred to as the unevenness depth) using a microscope. The microscope used may be a "One-Shot 3D Measuring Macroscope VR-6100" manufactured by KEYENCE Corporation. The software used for observing, measuring, and analyzing microscope images may be "Analysis Application VR-6000." The measurement conditions are a magnification of 12x and a field of view area of ​​24mm x 18mm. The measurement magnification and field of view area may be changed as appropriate depending on the size of the unevenness of fabrics 124 and 126.

[0039] Figure 2 shows the fabric surface on the XY plane as seen through a microscope. The depth of the unevenness is measured using the microscope. Measurements of fabrics 124 and 126 are taken on the side where the wet paper is attached. If there are any seams, they are avoided during measurements.

[0040] First, draw a line segment AB along the warp yarns as shown in Figure 2 to obtain a height profile (measured cross-sectional curve). At this time, draw line segment AB to a length that reveals the periodicity of the height. Next, draw a line segment CD along the weft yarns so that it includes the lowest point of line segment AB to obtain the height profile (measured cross-sectional curve) in Figure 3. Note that line segment CD should be drawn so that the periodicity of the height appears.

[0041] 3, a measurement tool is used to determine the lowest concave portion (minimum value) D1 and the highest convex portion (maximum value) H1 of the fabrics 124 and 126 within one cycle. Next, the value of D1 is subtracted from H1 to determine the depth of the concave / convex portion. Thereafter, the same measurement as above is carried out at different locations for 10 periods, and the average value is finally adopted as the depth of the unevenness (the vertical distance from the maximum height value to the minimum height value of the unevenness).

[0042] Furthermore, fabrics 124 and 126 have a warp diameter of 0.20 mm to 0.65 mm, a weft diameter of 0.40 mm to 0.90 mm, and a mesh thickness of 1.00 mm to 1.90 mm. If the warp diameter is less than 0.20 mm or the weft diameter is less than 0.40 mm, the mesh thickness is low, resulting in a kitchen towel sheet 1x with a low paper thickness and poor absorbency. If the mesh thickness is less than 1.00 mm, the kitchen towel sheet 1x with a low paper thickness and poor absorbency is also poor. If the warp diameter exceeds 0.65 mm or the weft diameter exceeds 0.90 mm, the uneven surface area decreases if the number of holes remains the same, and the number of uneven surfaces decreases if the hole area remains the same. As a result, in either case, the TS750 (described below) becomes high, and the resulting kitchen towel sheet 1x has poor texture. Furthermore, if the mesh thickness exceeds 1.90 mm, the paper web 105 is difficult to dry, which makes it prone to breakage and reduces operability.

[0043] In the fabrics 124 and 126, the lower limit of the warp diameter is preferably 0.25 mm or more, more preferably 0.30 mm or more, and the upper limit is preferably 0.60 mm or less, more preferably 0.55 mm or less. The lower limit of the weft diameter is preferably 0.42 mm or more, more preferably 0.45 mm or more, and the upper limit is preferably 0.88 mm or less, more preferably 0.85 mm or less. Furthermore, the lower limit of the mesh thickness is preferably 1.05 mm or more, more preferably 1.15 mm or more, and the upper limit is preferably 1.80 mm or less, more preferably 1.50 mm or less.

[0044] The warp and weft diameters of fabrics 124 and 126 are determined by measuring the horizontal distance between the warp and weft diameters of fabrics 124 and 126 using a microscope. The microscope used may be a Keyence Corporation One-Shot 3D Measuring Macroscope VR-6100. The microscope software used for observing, measuring, and analyzing microscope images may be an Analysis Application VR-6000. The measurement conditions are a magnification of 40x and a field of view of 7.6mm x 5.7mm. The measurement magnification and field of view may be adjusted depending on the size of the unevenness of the fabric.

[0045] Figure 4 shows the fabric surface on the XY plane as seen through a microscope. The warp and weft diameters are determined using the microscope and measurement software mentioned above. The measurement is performed on the side of the fabric where the wet paper is attached. If there is a seam, the measurement is performed while avoiding it.

[0046] Of the warp diameters of fabrics 124 and 126 shown in Figure 4, warp diameter 1 directly reflects the fiber diameter. In contrast, warp diameter 2 is subjected to pressure from the weft and is slightly crushed and elongated. Therefore, the final warp diameter is the average value of five portions equivalent to warp diameter 1 and five portions equivalent to warp diameter 2.

[0047] Furthermore, among the weft diameters of the fabrics 124 and 126 shown in Figure 4, weft diameter 1 directly reflects the fiber diameter. In contrast, weft diameter 2 is subjected to pressure from the warp yarns and is slightly crushed and elongated. Therefore, the final weft diameter is determined by averaging five portions equivalent to weft diameter 1 and five portions equivalent to weft diameter 2. The mesh thickness of fabrics 124 and 126 is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 1.8 N and a probe diameter of 10 mm. The sample is placed between the probe and the measuring table, and the gauge is read when the probe is lowered at a speed of 1 mm per second or less. The measurement is then repeated 10 times (measurements are not taken at the same location 10 times, but at 10 different locations), and the average of the measurement results is taken as the final mesh thickness.

[0048] In the papermaking process, the ratio of slurry jet speed to fabric speed (J / W ratio) is 1.02 or more and 1.12 or less. If the J / W ratio is less than 1.02, the DMDT / DCDT ratio, which is the tensile strength ratio of the base paper, becomes high, and the kitchen towel sheet 1x becomes more likely to tear in the CD direction. If the J / W ratio exceeds 1.12, the DMDT / DCDT ratio, which is the tensile strength ratio of the base paper, becomes high, and the kitchen towel sheet 1x becomes more likely to tear in the CD direction. The lower limit of the J / W ratio is preferably 1.03 or more, more preferably 1.04 or more, and the upper limit is preferably 1.10 or less, more preferably 1.08 or less.

[0049] Furthermore, in the papermaking process using the TAD papermaking machine 110, the papermaking speed is preferably 600 m / min or more and 1400 m / min or less. If the papermaking speed is less than 600 m / min, the resulting kitchen towel sheet 1x will be strong and have poor texture. If the papermaking speed is more than 1400 m / min, the resulting kitchen towel sheet 1x will have a low basis weight, be easily torn, and have poor water absorbency. The lower limit of the machine speed is preferably 650 m / min or more, and more preferably 700 m / min or more. The upper limit is preferably 1350 m / min or less, and even more preferably 1300 m / min or less. The machine speed in this case refers to the speed of the fabrics 124 and 126 when the slurry is sprayed from the head box 128 onto the fabrics 124 and 126.

[0050] In the papermaking process using the TAD papermaking machine 110, the first pass retention (hereinafter also referred to as FPR) is preferably 50% or more and 98% or less. If the FPR is less than 50%, the pulp and strength agent retention is poor and the paper is more likely to break, resulting in poor operability. If the FPR is more than 98%, the paper web 105 is difficult to dry, making the paper more likely to break and resulting in poor operability. The lower limit of the FPR is more preferably 60% or more, and even more preferably 70% or more, and the upper limit is more preferably 96% or less, and even more preferably 94% or less.

[0051] First pass retention, also known as first retention rate, is the rate at which raw materials in the stock accumulate on the fabrics 124 and 126. It is calculated as follows: First pass retention = {(stock consistency (mass%) in the headbox 128) - (stock consistency (mass%) in the white water dewatered by the fabrics 124 and 126)} / (stock consistency (mass%) in the headbox 128) x 100. For example, if the stock concentration in the headbox 128 (the total concentration of the papermaking raw material (pulp) and other solid papermaking chemicals in the stock) is 0.8% by mass and the stock concentration in the white water dewatered by the fabrics 124 and 126 is 0.3% by mass, then FPR = (0.8% - 0.3%) / 0.8% x 100 = 63%. In other words, 63% of the raw material will be made into paper, and 37% will return to the raw material without being made into paper.

[0052] In the papermaking process, it is preferable that a concave-convex pattern derived from the papermaking process (fabric), which is different from the embossed pattern described below, is applied to the base paper and the kitchen towel sheet 1x. Without this concave-convex pattern, the produced kitchen towel sheet 1x will have poor water absorbency. Note that "originating from the papermaking process" means that, in the papermaking process for the kitchen towel sheet 1x, an uneven pattern is imparted between the head box 128 of the papermaking machine and the outlet of the Yankee dryer 150. Specifically, in a part of the papermaking apparatus 110 shown in FIG. 1, unevenness can be imparted in a (belt) press section (not shown) disposed between the press roll 132 and the Yankee dryer 150. In the (belt) press section, the paper web 105 and an uneven belt (the uneven belt loops between the (belt) press section and the Yankee dryer 150) are pressed together to impart an uneven pattern to the paper web 105. Note that the uneven belt may be an uneven fabric (wire).

[0053] The uneven pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the uneven pattern will change the specific volume (paper thickness), but it is preferable to select a pattern that will keep the specific volume in the rolled state within the above-mentioned numerical range.

[0054] (base paper) The basis weight per ply of the base paper produced from the paper web 105 through the above-mentioned papermaking process is 18.0 g / m 2 More than 29.0g / m 2 The basis weight of the base paper is 18.0 g / m 2 If the base paper has a basis weight of less than 29.0 g / m, the resulting kitchen towel sheet 1x will be easily torn and will have poor water absorbency. 2 If the strength exceeds this, the resulting kitchen towel sheet 1x will be too high and will have a poor texture. The minimum basis weight of the base paper is 19.0 g / m 2 It is preferable that the content is 19.4 g / m or more. 2 The upper limit is preferably 26.0 g / m or more. 2 Preferably, the content is 24.0 g / m or less. 2It is more preferable that the basis weight per ply of the base paper of the kitchen towel sheet 1x is as follows: The basis weight per ply of the base paper of the kitchen towel sheet 1x can be measured in accordance with JIS P 8124.

[0055] The lower limit of the DMDT (Dry Machine Direction Tensile Strength) per two plies of the base paper when dry is preferably 980 cN / 76 mm or more, more preferably 1720 cN / 76 mm or more, and even more preferably 1820 cN / 76 mm or more, and the upper limit is preferably 5200 cN / 76 mm or less, more preferably 4410 cN / 76 mm or less, and even more preferably 3920 cN / 76 mm or less. Similarly, the lower limit of the dry cross direction tensile strength (DCDT) of the base paper per two plies in the CD direction when dry is preferably 1620 cN / 76 mm or more, more preferably 1780 cN / 76 mm or more, and even more preferably 2030 cN / 76 mm or more, and the upper limit is preferably 4704 cN / 76 mm or less, more preferably 4214 cN / 76 mm or less, and even more preferably 3724 cN / 76 mm or less.

[0056] If the DMDT per two plies of base paper is less than 980 cN / 76 mm, or if the DCDT per two plies of base paper is less than 1620 cN / 76 mm, the resulting kitchen towel sheet 1x will be prone to tearing. If the DMDT per two plies of base paper exceeds 5200 cN / 76 mm, or if the DCDT per two plies of base paper exceeds 4704 cN / 76 mm, the resulting kitchen towel sheet 1x will be too strong and will have poor texture.

[0057] Furthermore, the ratio of the tensile strength in the MD direction per two plies when dry (DMDT) to the tensile strength in the CD direction per two plies when dry (DCDT) of the base paper (DMDT / DCDT) is 0.78 or more and 2.70 or less. If the ratio is less than 0.78, the strength of the kitchen towel sheet 1x will be too high if the DCDT is too high, resulting in a poor texture, and if the DMDT is too low, the kitchen towel sheet 1x will be prone to tearing. If the ratio is more than 2.70, the strength of the kitchen towel sheet 1x will be too high if the DMDT is too high, resulting in a poor texture, and if the DCDT is too low, the kitchen towel sheet 1x will be prone to tearing. The ratio of DMDT per two plies to DCDT per two plies of base paper (DMDT / DCDT) preferably has a lower limit of 0.82 or more, more preferably 0.86 or more, and an upper limit of 2.10 or less, more preferably 1.85 or less. DMDT and DCDT per two plies of base paper are measured in accordance with JIS P 8113. The measurement is carried out with two sheets of base paper stacked together (two-ply state).

[0058] The kitchen towel roll 1 is manufactured by providing an embossed pattern to at least one ply of base paper having the above characteristics and laminating two or three plies to form a kitchen towel sheet 1x, which is then wound into a roll. If the produced kitchen towel sheet 1x has fewer than two plies, the kitchen towel sheet 1x will be prone to tearing. If the kitchen towel sheet 1x has more than three plies, the strength of the kitchen towel sheet 1x will be too high, resulting in poor texture.

[0059] <Kitchen towel roll> Figure 5 is a perspective view of a kitchen towel roll 1 according to one embodiment of the present invention, manufactured by the manufacturing method described above. As shown in Figure 5, the kitchen towel roll 1 according to this embodiment is a kitchen towel sheet 1x made by laminating two or three plies of sheets each having an embossed pattern on a base paper, and wound into a roll. Note that the kitchen towel sheet 1x is preferably perforated in the width direction of the roll at approximately equal intervals in the winding direction of the roll (not shown). 5, the surface of the kitchen towel sheet 1x facing the outside of the roll is referred to as surface 1a (surface of the kitchen towel sheet 1x), and the surface facing the center of the roll is referred to as back surface 1b (back surface of the kitchen towel sheet 1x). Also, the edge of the kitchen towel sheet 1x is referred to as the outermost edge 1e of the kitchen towel roll 1.

[0060] The kitchen towel roll 1 can be used, for example, as a roll of kitchen paper (sometimes called paper towel or cooking paper) used in home kitchens and restaurant kitchens to wipe away moisture or oil and remove dirt, as well as other rolls of sanitary paper.

[0061] (winding length and winding diameter) The lower limit of the roll length of the kitchen towel roll 1 is preferably 18 m or more, more preferably 22 m or more, and even more preferably 27 m or more, and the upper limit is preferably 45 m or less, more preferably 40 m or less, and even more preferably 31 m or less. If the reel length is less than 18 m, the basis weight of the kitchen towel sheet 1x must be increased to achieve a certain reel diameter DR, resulting in excessive strength and poor texture. Furthermore, the frequency of transfer during roll processing increases, making it more susceptible to paper dust contamination and requiring more frequent cleaning, resulting in poor operability. If the reel length exceeds 45 m, the basis weight of the kitchen towel sheet 1x must be reduced or the reel density must be increased to achieve a certain reel diameter DR, resulting in the kitchen towel sheet 1x being more prone to tearing and having poor absorbency.

[0062] The roll length is measured as follows: First, measure the length of 10 kitchen towel sheets 1x between the perforations on kitchen towel roll 1. Next, measure the number of sheets on 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 1.6 m and there are 180 sheets, the roll length is 180 x (1.6 / 10) = 28.8 m. If kitchen towel roll 1 does not have perforations, measure the roll length.

[0063] The lower limit of the roll diameter DR of the kitchen towel roll 1 according to this embodiment is preferably 130 mm or more, more preferably 135 mm or more, and even more preferably 142 mm or more, and the upper limit is preferably 170 mm or less, more preferably 165 mm or less, and even more preferably 156 mm or less. If the roll diameter DR is less than 130 mm, the roll density of the kitchen towel sheet 1x will be high, resulting in the kitchen towel sheet 1x being prone to tearing and having poor absorbency.If the roll diameter DR exceeds 170 mm, and the roll length remains unchanged, the kitchen towel sheet 1x will have a high paper thickness, and the specific volume will be too high, making it prone to tearing.

[0064] The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Three kitchen towel rolls 1 are measured and the measurement results are averaged.

[0065] (roll width and roll mass) The roll width of the kitchen towel roll 1 has a lower limit of preferably 260 mm or more, more preferably 270 mm or more, and even more preferably 275 mm or more, and an upper limit of preferably 300 mm or less, more preferably 290 mm or less, and even more preferably 286 mm or less. If the roll width is less than 260 mm, the kitchen towel sheet 1x will be small and will have poor absorbency. If the roll width is more than 300 mm, the kitchen towel sheet 1x will be too large and will be prone to tearing in unintended places.

[0066] The lower limit of the roll mass of the kitchen towel roll 1 is preferably 290 g or more, more preferably 310 g or more, and even more preferably 320 g or more, and the upper limit is preferably 510 g or less, more preferably 450 g or less, and even more preferably 420 g or less. If the roll mass is less than 290 g and the roll length remains the same, the kitchen towel sheet 1x will have a low basis weight, be easily torn, and have poor absorbency.If the roll mass exceeds 510 g and the roll length remains the same, the kitchen towel sheet 1x will have a high basis weight, be too strong, and have a poor texture.

[0067] The roll mass is the mass per 280mm of roll width, excluding the paper tube (core) of kitchen towel roll 1. If the roll width is not 280mm, convert it to the mass per 280mm by proportional calculation.

[0068] (roll density) The roll density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.04 g / cm 3 It is preferable that the concentration is 0.05 g / cm or more. 3 More preferably, it is 0.06 g / cm or more. 3 The upper limit is more preferably 0.12 g / cm. 3 Preferably, it is 0.11 g / cm or less.3 More preferably, it is 0.10 g / cm or less. 3 It is more preferable that: Roll density is 0.04g / cm 3 If the roll density is less than 0.12 g / cm, the basis weight of the kitchen towel sheet 1x will be low and the sheet will be prone to tearing, and the absorbency will be poor. 3 If the roll volume remains unchanged, the basis weight of the kitchen towel sheet 1x will be too high, resulting in excessive strength and poor texture.

[0069] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of a kitchen towel roll 1 per 280 mm of roll width. Roll volume is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter DR)} - (cross-sectional area of ​​the core's outer diameter DI)] × roll width (converted per 280 mm). For example, if the roll mass (excluding the core) per 280 mm of roll width is 400 g, the winding diameter DR is 145 mm, and the core's outer diameter DI is 40 mm, then roll density = 400 g ÷ [{3.14 × (145 mm ÷ 2 ÷ 10) 2 -3.14×(40mm÷2÷10) 2}×(280mm÷10)]=0.09g / cm 3 This becomes:

[0070] (winding density) The winding density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.28 m / cm 2 It is preferable that the thickness is 0.30 m / cm or more. 2 More preferably, it is 0.32 m / cm or more. 2 The upper limit is more preferably 0.43 m / cm. 2 Preferably, it is 0.41 m / cm or less. 2 More preferably, it is 0.39 m / cm or less. 2 It is more preferable that: Winding density is 0.30m / cm 2If the winding density is less than 0.43 m / cm, the winding length of the kitchen towel sheet 1x will be short if the winding diameter remains the same, resulting in poor operability. 2 If the thickness exceeds this, the paper thickness of the kitchen towel sheet 1x will be reduced, making it more likely to tear and less absorbent.

[0071] The winding density is expressed as (winding length x number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll outer diameter (winding diameter DR) - (cross-sectional area of ​​the core outer diameter DI)}. For example, in the case of a winding length of 30 m, 2 plies, winding diameter DR of 150 mm, and core outer diameter DI of 40 mm, the winding density = (30 m x 2) ÷ {3.14 x (150 mm ÷ 2 ÷ 10)} 2 -3.14×(40mm÷2÷10) 2}=0.37m / cm 2 This becomes:

[0072] (Core outer diameter) The core outer diameter DI of the kitchen towel roll 1 of the present invention is preferably 20 mm or more, more preferably 30 mm or more, and even more preferably 38 mm or more, and the upper limit is preferably 60 mm or less, more preferably 55 mm or less, and even more preferably 50 mm or less. If the core outer diameter DI is less than 20 mm, the kitchen towel sheet 1x must be wound longer and have a lower basis weight to achieve a certain range of reel diameter DR and roll weight, resulting in greater tearing and poorer absorbency. If the core outer diameter DI exceeds 60 mm, the resulting reel diameter DR becomes larger, and to achieve a certain range of reel diameter DR, the kitchen towel sheet 1x must instead be wound more densely, resulting in a thinner paper, greater tearing, and poorer absorbency.

[0073] The core outer diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Three kitchen towel rolls 1 are measured and the measurement results are averaged. If the core does not have a paper tube, the outer diameter of the hollow core portion is measured.

[0074] <Kitchen towel sheet> (Pulp containing) The kitchen towel sheet 1x preferably contains wet pulp. The wet pulp content is preferably 50% or more. If the wet pulp content is less than 50%, the kitchen towel sheet 1x will have poor water absorbency. There is no upper limit for the wet pulp content, but if it is too high, the strength of the kitchen towel sheet 1x will tend to increase, which may result in a poor texture. The wet pulp content in the kitchen towel sheet 1x is more preferably 70% or more, and even more preferably 90% or more.

[0075] As the pulp, for example, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), etc. can be used, and the content ratio thereof is preferably NBKP:LBKP=40-100% by mass:0-40% by mass, more preferably NBKP:LBKP=50-90% by mass:10-50% by mass, and even more preferably NBKP:LBKP=60-80% by mass:20-40% by mass.

[0076] (Basic weight) The basis weight of one ply of kitchen towel sheet is 17.6 g / m 2 More than 30.0g / m 2 The basis weight per ply is preferably 17.6 g / m or less. 2 If the ply weight is less than 30.0 g / m, the kitchen towel sheet 1x will be easily torn and will have poor absorbency. 2 If it exceeds this value, the strength of the kitchen towel sheet 1x will increase and the texture will be inferior. The minimum basis weight per ply of a kitchen towel sheet is 18.6 g / m 2 More preferably, it is 19.0 g / m or more. 2 The upper limit is 26.5 g / m or more. 2 More preferably, it is 24.5 g / m or less. 2It is more preferable that the basis weight per ply of the kitchen towel sheet 1x is less than or equal to: The basis weight per ply of the kitchen towel sheet 1x can be measured in accordance with JIS P 8124.

[0077] (paper thickness) The paper thickness of the kitchen towel sheet 1x is preferably 2.1 mm / 10 ply or more and 4.1 mm / 10 ply or less. If the paper thickness is less than 2.1 mm / 10 ply, the kitchen towel sheet 1x will have poor water absorbency. If the paper thickness is more than 4.1 mm / 10 ply, the specific volume of the kitchen towel sheet 1x will increase, making it more likely to tear. The paper thickness of the kitchen towel sheet 1x is preferably 2.3 mm / 10 plies or more, more preferably 2.6 mm / 10 plies or more, and more preferably 3.9 mm / 10 plies or less, more preferably 3.7 mm / 10 plies or less.

[0078] The thickness of a 1x kitchen towel sheet can be measured using a thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.) The measurement conditions are a load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring table, and the gauge is read when the probe is lowered at a speed of 1 mm per second or less. The sample is a 10-ply kitchen towel sheet (2 plies x 5 sets = 10 plies, and if it is 3 plies, the value is calculated proportionally as 3 sets to make 10 plies). The measurement is repeated 10 times at different points, and the average of the measurement results is used as the final paper thickness of the kitchen towel sheet 1x.

[0079] (seat length) The sheet length between perforations (the length of the kitchen towel sheet 1x in the direction of winding the roll) has a lower limit of preferably 100 mm or more, more preferably 130 mm or more, and even more preferably 150 mm or more, and an upper limit of preferably 250 mm or less, more preferably 220 mm or less, and even more preferably 210 mm or less. If the sheet length is less than 100 mm, the kitchen towel sheet 1x will have poor absorbency. If the sheet length is more than 250 mm, the kitchen towel sheet 1x will be too long and will be prone to tearing in unintended places.

[0080] (specific volume) The specific volume of one kitchen towel sheet is 7cm 3 / g or more 23cm 3 / g or less. The specific volume of 1x kitchen towel sheet is 7 cm 3 If the specific volume of the kitchen towel sheet 1x is less than 23 cm3 / g, the kitchen towel sheet 1x will have poor water absorbency. 3 If the density exceeds 1 / g, the voids in the kitchen towel sheet 1x will become larger and the sheet will tear more easily. The specific volume of one kitchen towel sheet is 9cm 3 / g or more is more preferable, and 11cm 3 / g or more is more preferable. The upper limit is 22 cm 3 / g or less is more preferable, and 17cm 3 The specific volume is calculated by dividing the paper thickness per ply of 1x kitchen towel sheet by the basis weight per ply, and then calculating the volume (cm) per unit (g). 3 )

[0081] (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of the kitchen towel sheet 1x per two or three plies when dry is preferably 1146 cN / 76 mm or more and 5733 cN / 76 mm or less. If the DMDT per two or three plies is less than 1146 cN / 76 mm, the kitchen towel sheet 1x is prone to tearing. If the DMDT per two or three plies exceeds 5733 cN / 76 mm, the strength of the kitchen towel sheet 1x will be high, resulting in poor texture. The DMDT per two or three plies of the kitchen towel sheet 1x is preferably 1834 cN / 76 mm or more, more preferably 2063 cN / 76 mm or more, and more preferably 5160 cN / 76 mm or less, more preferably 4587 cN / 76 mm or less.

[0082] Furthermore, the dry cross direction tensile strength (DCDT) of the kitchen towel sheet 1x per two or three plies when dry is preferably 1766 cN / 76 mm or more and 5128 cN / 76 mm or less. If the DCDT per two or three plies is less than 1766 cN / 76 mm, the kitchen towel sheet 1x is prone to tearing. If the DCDT per two or three plies exceeds 5128 cN / 76 mm, the strength of the kitchen towel sheet 1x will be high, resulting in poor texture. The DCDT per two or three plies of the kitchen towel sheet 1x is preferably 1940 cN / 76 mm or more, more preferably 2213 cN / 76 mm or more, and more preferably 4593 cN / 76 mm or less, more preferably 4059 cN / 76 mm or less. DMDT and DMDT per 2-ply or 3-ply kitchen towel sheet 1x are measured in accordance with JIS P 8113. Note that DMDT and DMDT measurements are performed on 1x kitchen towel sheet in its product ply (2-ply or 3-ply) form.

[0083] (TS750) Furthermore, for a kitchen towel sheet 1x, a tissue softness measuring device TSA (manufactured by emtec; Tissue Softness Analyzer) was used to measure the vibration of the sample stage. A bladed rotor was pressed from above with a pressing pressure of 100 mN onto a sample of the kitchen towel sheet 1x placed on a sample stage, and then the sample stage was rotated at a rotation speed of 2.0 / sec. When the vibration of the sample stage was measured with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), which was automatically acquired by the software on the TSA, was 50 dBV. 2 rms over 110dBV 2 rms. TS750 is 50dBV or less. 2 If the TS750 is less than 110 dBV, the number of embossments and the number of irregularities resulting from papermaking in the kitchen towel sheet 1x will be reduced, resulting in poor water absorption. 2 Above rms, the texture of 1x kitchen towel sheet will be inferior. The TS750 has a lower limit of 58dBV. 2 rms or higher is preferable, 65dBV 2 It is more preferable that the level is rms or higher. The upper limit is 103 dBV. 2 rms or less is preferable, 95dBV 2 It is more preferable that it is rms or less.

[0084] The TS750 values ​​are the numerical values ​​measured on the surface 1a of the kitchen towel sheet 1x (measured as a 2-ply or 3-ply sheet) using a tissue softness measuring device (TSA). The lower the TS750 value, the better the smoothness. However, if the TS750 value is too low, the sheet may be too smooth and may end up being less smooth.

[0085] The method for measuring the TS750 value using the TSA tissue softness measuring device and the measuring device used are described in detail in, for example, JP 2013-236904 A. For various measuring methods using the TSA tissue softness measuring device, please refer to the above patent documents.

[0086] (Embossed) The kitchen towel roll 1 (kitchen towel sheet 1x) of this embodiment is embossed and has an embossed pattern (an embossed pattern is provided). Furthermore, the kitchen towel sheet 1x can be laminated after the embossing process. When laminating, for example, plybond glue can be used, and the glue can be applied for adhesion. Water may also be used instead of plybond glue. If the kitchen towel sheet 1x does not have an embossed pattern, the entire surface of the kitchen towel sheet 1x will end up being coated with plybond glue, resulting in an inferior texture of the kitchen towel sheet 1x.

[0087] The plybond glue can be applied to the backside of the embossed portion of the sheet on the front surface 1a of a two-ply kitchen towel sheet 1x (between the sheet on the front surface 1a and the sheet on the back surface 1b of the two-ply), and then the two sheets can be laminated together. In the case of a three-ply kitchen towel sheet, it is possible to emboss two layers on the front surface 1a and apply glue to the backside of the middle layer, or to emboss one layer on the front surface 1a and apply glue to the backside of the layer on the front surface 1a. Of these, it is preferable to emboss two layers on the front surface 1a and apply glue to the backside of the middle layer.

[0088] FIG. 7 is a diagram showing an example of an embossing pattern on the kitchen towel roll 1 of this embodiment. The linear embossing pattern is not particularly limited, but a pattern such as that shown in Fig. 7 is preferred. Specifically, one pattern may include two of two types of figures: a roughly circular figure with another design inside, and a figure that is roughly line-symmetrical (may have a tilt) in the vertical and horizontal directions as a whole and includes a combination of multiple curves and figures, but the shape of the figures is not particularly limited. For the roughly circular figure, it is preferred that the roughly circular figure be doubled.

[0089] Furthermore, with regard to the dimensions of the embossed pattern, it is preferable that the rectangle E (E is not the embossed pattern) surrounding the embossed pattern be a square with sides of 2 cm to 25 cm. The lower limit of the above range for rectangle E is more preferably a square with sides of 5 cm or more, and even more preferably a square with sides of 8 cm or more. The upper limit of the above range for rectangle E is more preferably a square with sides of 20 cm or less, and even more preferably a square with sides of 15 cm or less. The vertical direction of rectangle E is preferably parallel to the winding direction of kitchen towel roll 1, and the horizontal direction is preferably parallel to the width direction of kitchen towel roll 1, although they may be tilted. Using such a pattern can further improve the water absorption capacity of a kitchen towel sheet 1x that has high water absorption capacity. Furthermore, using a linear embossed pattern can more effectively suppress the generation of paper dust when rolls rub against each other.

[0090] As described above, the embossed pattern preferably includes a linear embossed pattern (hereinafter also referred to as a linear embossed portion), and the proportion of the linear embossed portion included in the embossed pattern 10 is preferably 20% or more. If the proportion is less than 20%, the embossed pattern will not contribute to improving the texture and water absorbency, and the texture and water absorbency of the kitchen towel sheet 1x will be inferior. The proportion of linear embossed portions included in the embossed pattern is more preferably 50% or more, and even more preferably 90% or more.

[0091] In addition, the back surface 1b of the kitchen towel sheet 1x is not particularly limited as to whether it has an embossed pattern, as long as it has a pattern of protrusions and recesses derived from the papermaking process that is different from the embossed pattern described below. Nested embossing or pin-to-pin embossing may be applied, or it may not be embossed at all, but nested embossing or no embossing is preferred, and no embossing is more preferred.

[0092] (Water absorption amount) In the present invention, the water absorption per unit area of ​​two plies of one kitchen towel sheet is 300 g / m 2 More than 650g / m 2 The water absorption per unit area is preferably 300 g / m or less. 2 If the thickness is less than 650g / m, the kitchen towel sheet 1x will have poor absorbency. 2 If the thickness exceeds this, the specific volume of 1x kitchen towel sheet will become larger and it will be more likely to tear. The minimum water absorption per unit area of ​​2 plies of a kitchen towel sheet is 350 g / m 2 It is preferable that the weight is 400 g / m or more. 2 The upper limit is 620 g / m or more. 2 Preferably, it is 600 g / m or less. 2 More preferably, it is:

[0093] Furthermore, the water absorption per unit mass of two plies of the kitchen towel sheet 1x is preferably 8 g / g or more and 20 g / g or less. If the water absorption per unit mass is less than 8 g / g, the kitchen towel sheet 1x will have poor water absorption. If the water absorption per unit mass is less than 20 g / g, the specific volume of the kitchen towel sheet 1x will be large, making it more likely to tear. The water absorption per unit mass of two plies of the kitchen towel sheet 1x is preferably 10 g / g or more, more preferably 11 g / g or more, and more preferably 18 g / g or less, and more preferably 16 g / g or less.

[0094] The method for measuring the water absorption of each of the kitchen towel sheets 1x will be described below with reference to FIG. First, a two-ply kitchen towel sheet 1x is taken and cut using a square template with each piece measuring 7.6 cm to prepare a rectangular test piece 20 with each side measuring 7.6 cm. The weight of the test piece 20 before water absorption is measured using an electronic balance. The test piece 20 is set in a holder 21 (a jig that fixes three points of the test piece 20, and the jig is made of a metal that does not absorb water).

[0095] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 20 set in the holder 21 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 20 is removed from the distilled water together with the holder 21. Next, as shown in FIG. 6, the holder 21 and test piece 20 are hung from a rod placed in an empty water tank with the corner 20a facing up, the lid of the water tank is closed, and the test piece is left for 5 minutes.

[0096] Thereafter, the holder 21 and the test piece 20 are removed from the water tank, and the weight of the test piece 20 is measured using an electronic balance. From the change in weight of the test piece 20 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 20 (g of water / sheet m 2 , 1m 2 Hit. Abbreviated as g / m 2 Furthermore, the water absorption per unit area (g of water / sheet m 2 ) by the basis weight of the two plies of the test piece 20 to obtain the water absorption per unit area (water g / sheet m 2 ) / basis weight (sheet g / sheet m 2 ) = Water absorption per unit weight (g of water / g of sheet, per 1g. Abbreviated as g / g). Measurements are carried out five times for each sample, and the average value is used. If the kitchen towel sheet is three-ply, it is preferable to measure it as a three-ply sheet using the same procedure as for two-ply sheets. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and a humidity of 50±2%. The distilled water is kept at 23±1°C.

[0097] As described above, according to the present embodiment, it is possible to provide a method for producing a kitchen towel roll in which there is little paper breakage during the papermaking process, the system is less likely to become dirty, and operability is excellent, and the sheet is less likely to tear while maintaining its texture and water absorbency.

[0098] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention. [Example]

[0099] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples shown below.

[0100] The kitchen towel rolls of Examples 1 to 16 and Comparative Examples 1 to 6 shown in Tables 3 and 4 were manufactured through the following processes: (1) papermaking and creping, (2) embossing and laminating, and (3) roll winding. The kitchen towel rolls of all Examples and Comparative Examples were measured for the above-mentioned parameters and evaluated as follows. Note that parameters other than those evaluated below were measured according to the above-mentioned standards or measurement methods. For each of the following evaluations, a score of 1 was considered a failure and a score of 2 or more was considered a pass.

[0101] 1. Kitchen towel sheet tear resistance The tear resistance of the manufactured kitchen towel sheets was evaluated by DMDT and DCDT on the kitchen towel sheets, and the DMDT and DCDT values ​​were used to evaluate the tear resistance on a four-point scale. The evaluation criteria are shown in Table 1 below. [Table 1]

[0102] 2. The texture of the kitchen towel sheet The texture of the manufactured kitchen towel sheets was evaluated by 30 monitors, and the number of people who felt that the texture of the sheets was poor was rated on a 4-point scale. The evaluation criteria were as follows: 4: 0-1 people felt that the seat had poor texture 3: 2-4 people felt that the seat had poor texture 2: 5-7 people felt that the seat had poor texture. 1: Eight or more people felt that the seat had poor texture

[0103] 3. Kitchen towel sheet absorbency The water absorbency of the produced kitchen towel sheet was evaluated based on the amount of water absorbed per unit area and per unit mass of the kitchen towel sheet, and was rated on a four-point scale based on the numerical value of each amount of water absorbency. The evaluation criteria are shown in Table 2 below. [Table 2]

[0104] 4. Less likely to break during the papermaking process When producing kitchen towel rolls, the reduction in paper breaks was evaluated compared to when the same kitchen towel rolls were produced using DCT, and the "reduction rate of paper breaks per hour" was evaluated on a four-point scale. The evaluation criteria were as follows: 4: "Reduction rate of number of paper breaks per hour" is 10% or more 3: "Reduction rate of number of paper breaks per hour" is 5% or more but less than 10% 2: "Reduction rate of number of paper breaks per hour" is 0% or more but less than 5% 1: The "reduction rate of paper breaks per hour" is less than 0% (including cases where it has increased)

[0105] [Table 3]

[0106] [Table 4]

[0107] As is clear from the results shown in Tables 3 and 4, the kitchen towel rolls of Examples 1 to 16 had sheets that were tear-resistant while maintaining texture and absorbency, and had few breaks during the papermaking process. In contrast, the sheets of Comparative Examples 1 to 6 were all inferior in either tear-resistant, texture, absorbency, or frequency of breaks during the papermaking process. Therefore, it has been confirmed that the present invention can provide a method for producing kitchen towel rolls that reduces paper breakage during the papermaking process, is less likely to contaminate the system, has excellent operability, and produces sheets that are less likely to tear while maintaining their texture and water absorbency. [Explanation of symbols]

[0108] 1 kitchen towel roll 1a surface 1b back side 1e The outermost edge of a kitchen towel roll 1x kitchen towel sheet 20 test specimens 20a Corner 21 Holder 105 Paper Web 110 Paper making equipment 120 Twin Forming Section 122 Forming Roll 124,126 Fabric 128 Headbox 130 Guide Roll 132 Press Roll 140 Water Removal Section 142a, 142b Through air dryer 144a, 144b Porous cylinder 146a, 146b, 154 Hood 150 Yankee Dryer 152 Doctor Blade 160 Web transfer device 170 Dewatering Section 172 Vacuum (reduced pressure) dehydration equipment 180 Web stamping device

Claims

1. A method for producing a kitchen towel roll, comprising: providing an embossed pattern on a base paper made using a TAD paper machine; laminating the base paper in two or three plies; and winding the resulting kitchen towel sheet into a roll; In the papermaking process using the TAD papermaking machine, the vertical distance from the maximum height value to the minimum height value of the irregularities of the fabric used is 0.40 mm or more and 0.90 mm or less, the warp diameter is 0.20 mm or more and 0.65 mm or less, the weft diameter is 0.40 mm or more and 0.90 mm or less, the mesh thickness is 1.00 mm or more and 1.90 mm or less, and the ratio of slurry jet speed / fabric speed (J / W ratio) is 1.02 or more and 1.12 or less, The basis weight of one ply of the base paper is 18.0 g / m ２ 29.0g / m or more ２ The ratio (DMDT / DCDT) of the tensile strength in the MD direction per two plies in a dry state to the tensile strength in the CD direction per two plies in a dry state (DCDT) is 0.78 or more and 2.70 or less, Using a tissue softness measuring device (TSA), a bladed rotor was pressed from above onto the kitchen towel sheet sample placed on a sample stage with a pressing pressure of 100 mN, and then rotated at a rotation speed of 2.0 / sec. When the vibration of the sample stage was measured with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), which was automatically acquired by the software on the TSA, was 50 dBV. ２ rms or more 110dBV ２ A method for producing a kitchen towel roll, characterized in that the rms is less than or equal to 1.

2. 2. The method for manufacturing a kitchen towel roll according to claim 1, wherein the papermaking speed in the papermaking process using the TAD papermaking machine is 600 m / min or more and 1400 m / min or less.

3. 2. The method for manufacturing a kitchen towel roll according to claim 1, wherein the first pass retention is 50% or more and 98% or less in the papermaking process using the TAD papermaking machine.

4. The water absorption per unit area of ​​two plies of the kitchen towel sheet is 300 g / m ２ 650g / m or more ２ 2. The method for producing a kitchen towel roll according to claim 1, characterized in that:

5. The specific volume of the kitchen towel sheet is 7 cm ３ / g or more 23cm ３ The method for producing a kitchen towel roll according to claim 1, wherein the kinematic viscosity is 1 / g or less.

6. 2. The method for manufacturing a kitchen towel roll according to claim 1, wherein the thickness of the kitchen towel sheet is 2.1 mm / 10 ply or more and 4.1 mm / 10 ply or less.

7. The method for manufacturing a kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a pattern of protrusions and recesses derived from a papermaking process, which is different from the embossed pattern.

8. The basis weight per ply of the kitchen towel sheet is 17.6 g / m ２ 30.0g / m or more ２ 2. The method for producing a kitchen towel roll according to claim 1, characterized in that:

9. 2. The method for producing a kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a tensile strength DMDT in the machine direction per two or three plies when dry of 1146 cN / 76 mm or more and 5733 cN / 76 mm or less.

10. 2. The method for producing a kitchen towel roll according to claim 1, wherein the tensile strength (DCDT) in the CD direction of the kitchen towel sheet per two or three plies when dry is 1766 cN / 76 mm or more and 5128 cN / 76 mm or less.

11. 2. The method for manufacturing a kitchen towel roll according to claim 1, wherein the water absorption per unit mass per two plies of the kitchen towel sheet is 8 g / g or more and 20 g / g or less.

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