kitchen towel roll

Abstract

To provide a kitchen towel roll that is reusable, that has a large amount of water absorption, and that has less paper powder and has more than a certain level of wound length.SOLUTION: In the kitchen towel roll, there is taken up in a roll a kitchen towel sheet which contains synthetic fiber and pulp fiber and which is applied with one ply embossing. The basis weight of the kitchen towel sheet is 50 g / m2 or more and 200 g / m2 or less; the depth of embossing is 0.1 mm or more and 2 mm or less; and the wound length of a roll is 5 m or more and 24 m or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] BACKGROUND ART In recent years, products such as hand towel rolls and kitchen towel rolls made of thick paper wound into a roll have become commercially available.

[0003] The problem with paper kitchen towel roll sheets (hereafter referred to as kitchen towel sheets) is that they cannot be reused; once they have been used to wipe away moisture and dirt, it is difficult to squeeze out the moisture or remove the dirt from them from a durability standpoint, so they end up being thrown away at that point. On the other hand, kitchen towel sheets made from nonwoven fabric containing synthetic fibers are highly durable and can be reused by rinsing off dirt with water, but they have low water absorption capacity and cannot wipe away large amounts of water.

[0004] To address these problems, a technology for hydroentangling pulp fibers with synthetic fibers has been developed and is attracting attention. As a prior art document on the technology of hydroentangling pulp fibers with synthetic fibers, for example, Patent Document 1 describes a nonwoven fabric wiper obtained by hydroentangling a pulp fiber web and a synthetic fiber web, in which the average fiber length of the pulp fibers contained in the pulp fiber web is 1.0 to 5.0 mm, and the basis weight of the nonwoven fabric wiper is 20 to 42 g / m 2 The nonwoven fabric wiper is characterized in that the composition ratio is 70 to 50 mass % of a pulp fiber web and 30 to 50 mass % of a synthetic fiber web. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-193634 Summary of the Invention [Problem to be solved by the invention]

[0006] In kitchen towel sheets manufactured by hydroentangling pulp fibers with synthetic fibers as described above, in order to increase the water absorption capacity, it is necessary to increase the amount of pulp fibers and increase the basis weight. However, increasing the amount of pulp fibers makes it difficult to hydroentangle all of the pulp fibers, and the untangled pulp fibers are likely to turn into paper dust. (Note that kitchen towel sheets made of 100% pulp fibers produce more paper dust because the pulp fibers are not hydroentangled with the synthetic fibers.) For this reason, it has been difficult to produce kitchen towel sheets and kitchen towel rolls containing synthetic fibers and pulp fibers that have high water absorption capacity and little paper dust.

[0007] The present invention has been made in consideration of the above circumstances, and its purpose is to provide a kitchen towel roll that is reusable, has a high water absorption capacity, produces little paper dust, and has a roll length of at least a certain amount. [Means for solving the problem]

[0008] The inventors conducted extensive research and discovered that, in a single-ply embossed kitchen towel roll containing synthetic fibers and pulp fibers, by setting the basis weight of the kitchen towel sheet, the depth of the embossing, and the roll length within predetermined numerical ranges, it is possible to produce a kitchen towel roll that is reusable, has high water absorption, produces little paper dust, and has a roll length of at least a certain level, thereby solving the above-mentioned problems and completing the present invention. Specifically, the present invention provides the following:

[0009] (1) A first aspect of the present invention is a kitchen towel roll in which one ply of embossed kitchen towel sheet containing synthetic fibers and pulp fibers is wound into a roll, and the basis weight of the kitchen towel sheet is 50 g / m 2 More than 200g / m 2The kitchen towel roll is characterized in that the embossing depth is 0.1 mm or more and 2 mm or less, and the roll length is 5 m or more and 24 m or less. (2) A second aspect of the present invention is the kitchen towel roll according to (1), wherein the roll density of the roll is 0.06 g / cm 3 More than 0.19g / cm 3 It is characterized by the following: (3) A third aspect of the present invention is a kitchen towel roll according to (1) or (2), wherein 1 m of the kitchen towel sheet is 2 The water absorption per 1 g is 270 g or more and 600 g or less, and the water absorption per 1 g is 2.5 g or more and 5.7 g or less. (4) A fourth aspect of the present invention is a kitchen towel roll according to any one of (1) to (3), characterized in that the dry CD tensile strength (DCDT) of the kitchen towel sheet is 4 N / 25 mm or more and 80 N / 25 mm or less, and the ratio (DMDT / DCDT) of the dry MD tensile strength (DMDT) of the kitchen towel sheet to the dry CD tensile strength (DCDT) of the kitchen towel sheet is 1.2 or more and 4.5 or less. (5) A fifth aspect of the present invention is a kitchen towel roll according to any one of (1) to (4), characterized in that the tensile strength in the machine direction (DMDT) of the kitchen towel sheet when dry is 15 N / 25 mm or more and 115 N / 25 mm or less. (6) A sixth aspect of the present invention is a kitchen towel roll according to any one of (1) to (5), characterized in that the content of the synthetic fiber in the kitchen towel sheet is 5% or more and 45% or less, and the content of the pulp fiber is 55% or more and 95% or less. (7) A seventh aspect of the present invention is a kitchen towel roll according to any one of (1) to (6), characterized in that the ratio of the wet MD tensile strength (WMDT) of the kitchen towel sheet to the dry MD tensile strength (DMDT) ((WMDT / DMDT) × 100(%)) is 50% or more and 95% or less. (8) The eighth aspect of the present invention is a kitchen towel roll according to any one of (1) to (7), characterized in that the ratio of the wet CD tensile strength (WCDT) of the kitchen towel sheet to the dry CD tensile strength (DCDT) ((WCDT / DCDT) × 100(%)) is 43% or more and 89% or less. (9) A ninth aspect of the present invention is a kitchen towel roll according to any one of (1) to (8), characterized in that the thickness of the kitchen towel sheet is 0.45 mm or more and 1.8 mm or less. (10) The tenth aspect of the present invention is a kitchen towel roll according to any one of (1) to (9), characterized in that the breaking elongation in the CD direction of the kitchen towel sheet is 50% or more and 100% or less. (11) The eleventh aspect of the present invention is a kitchen towel roll according to any one of (1) to (10), characterized in that the breaking elongation in the MD direction of the kitchen towel sheet is 20% or more and 65% or less. (12) A twelfth aspect of the present invention is the kitchen towel roll according to any one of (1) to (11), wherein the synthetic fiber has a basis weight of 8 g / m 2 More than 55g / m 2 and the pulp fiber has a basis weight of 38 g / m or less. 2 More than 160g / m 2 It is characterized by the following: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a kitchen towel roll that is reusable, has a high water absorption capacity, produces little paper dust, and has a roll length of at least a certain level. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view showing the entire kitchen towel roll of the present invention. [Figure 2] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 3] This is a graph showing the height profile on the XY plane obtained by a microscope. [Figure 4] FIG. 1 is a diagram showing how to determine the embossing depth for the embossed kitchen towel roll of the present invention. [Figure 5] FIG. 1 is a diagram showing a method for measuring the water absorption of a kitchen towel roll of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the form for carrying out the present invention (hereinafter referred to as the embodiment) will be described in detail with reference to the drawings. However, these are presented for the purpose of illustration only and are not intended to limit the present invention.

[0013] 1. Kitchen towel roll Figure 1 is a perspective view showing the appearance of a kitchen towel roll 1 of the present invention. The kitchen towel roll 1 of the present invention is a kitchen towel roll 1 in which one ply of embossed kitchen towel sheet 1x containing synthetic fibers and pulp fibers is wound into a roll. Preferably, the kitchen towel sheet 1x has perforations in the width direction at equal intervals in the machine direction (not shown). The sheet 1x of the present invention can be used for various roll products other than kitchen towels, and is preferably used as a wiper, hand towel or kitchen towel, and most preferably as a kitchen towel.

[0014] 1, the surface of kitchen towel sheet 1x facing the outside of the roll is referred to as surface 1a (surface of kitchen towel sheet 1x), and the surface facing the center of the roll is referred to as back surface 1b (back surface of kitchen towel sheet 1x). Note that, due to hydroentanglement, as described below, the amount of synthetic fibers contained in kitchen towel sheet 1x is preferably greater on the surface side of kitchen towel sheet 1x (i.e., surface 1a side) and less on back surface 1b side.

[0015] (winding length and winding diameter) The roll length of the kitchen towel roll 1 is 5 m to 24 m, preferably 7 m to 20 m, and more preferably 8 m to 16 m. If the roll length is less than 5 m, it will not be the roll length required for a normal kitchen towel roll, and if the roll length exceeds 24 m, the basis weight must be lowered instead, resulting in poor water absorption. The roll diameter DR of the kitchen towel roll 1 is preferably 105 mm to 155 mm, more preferably 110 mm to 140 mm, and even more preferably 115 mm to 130 mm. If the roll diameter DR is less than 105 mm, the roll length required for a typical kitchen towel roll will not be sufficient, while if the roll diameter DR exceeds 155 mm, the roll will be too large and difficult to use, and the higher basis weight will result in more paper dust.

[0016] The roll length is determined by measuring the length of 10 sheets of kitchen towel sheets 1x between the perforations of kitchen towel roll 1. Then, the number of sheets in kitchen towel roll 1 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80 m and there are 150 sheets, the roll length is 1.80 m x (150 / 10) = 27 m. If kitchen towel roll 1 does not have perforations, the roll length can be measured by measuring it. The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Corporation. Ten kitchen towel rolls 1 are measured, and the results are averaged. The length between perforations (the length of the sheet in the machine direction) is preferably 110 mm to 360 mm, more preferably 160 mm to 310 mm, and even more preferably 210 mm to 260 mm. By keeping the length within this range, when using a kitchen towel roll 1 with a high water absorption capacity as in the present application, the area used will be appropriate and it will be able to absorb a large amount of water.

[0017] (roll width and roll weight) The roll width of the kitchen towel roll 1 is preferably 150 mm to 380 mm, more preferably 200 mm to 350 mm, and even more preferably 250 mm to 300 mm. By setting the roll width within this range, when using a kitchen towel roll 1 with a high water absorption capacity as in the present application, the area used will be appropriate and it will be able to absorb a large amount of water. The roll weight of the kitchen towel roll 1 is preferably 170 g to 460 g, more preferably 250 g to 410 g, and even more preferably 280 g to 360 g. If the roll weight is less than 170 g, the roll length required for a normal kitchen towel roll will not be achieved, and if the roll weight exceeds 460 g, the basis weight of the kitchen towel sheet 1x will be high, resulting in a lot of paper dust. The roll mass is the mass of one roll per 275mm of roll width, excluding the core (paper tube). If the roll width is not 275mm, it is converted to the mass per 275mm by proportional calculation.

[0018] (Core outer diameter) Furthermore, the core outer diameter DI of the kitchen towel roll 1 of the present invention is preferably 30 mm to 60 mm, more preferably 34 mm to 55 mm, and even more preferably 37 mm to 50 mm. If the core outer diameter DI is less than 30 mm, the core will be too small and difficult to use when rolled, while if the core outer diameter DI exceeds 60 mm, the core will be too large and difficult to use when rolled. The core outer diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Ten kitchen towel rolls 1 are measured and the measurement results are averaged.

[0019] (roll density) The roll density of kitchen towel roll 1 is 0.06 g / cm 3 More than 0.19g / cm 3 Preferably, it is 0.09 g / cm or less. 3 More than 0.17g / cm 3 More preferably, it is 0.11 g / cm or less. 3 More than 0.15g / cm 3 It is more preferable that the roll density of the kitchen towel roll 1 is 0.06 g / cm or less. 3 If the thickness is less than 0.19 g / cm, the roll length will be shortened due to the need to roll the roll loosely to ensure the embossing depth, and the roll density of kitchen towel roll 1 will be 0.19 g / cm. 3 If it exceeds this value, the embossing depth will be shallow and the amount of paper dust will increase.

[0020] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of a kitchen towel roll per 275 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)] x roll width (converted per 275 mm). For example, if the roll mass (excluding the core) per 275 mm of roll width is 337 g, the winding diameter is 119 mm, and the core's outer diameter is 49 mm, the roll density = 0.13 g / cm 3 If the kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI.

[0021] 2. Kitchen towel sheet As described above, the kitchen towel sheet 1x of the present invention contains synthetic fibers and pulp fibers. Examples of synthetic fibers include nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene. To obtain a high-basis-weight kitchen towel sheet 1x with a predetermined embossing, such as that of the present invention, polyethylene and polypropylene are preferred, with polypropylene being more preferred. Furthermore, common pulp fibers, such as softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP), can be used. The NBKP / LBKP content ratio in the pulp fibers is preferably 50:50 to 100:0, more preferably 70:30 to 100:0, even more preferably 90:10 to 100:0, and most preferably 100:0. As NBKP, for example, fibers made from radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir are preferred. Note that NUKP can be used instead of NBKP, and LUKP can be used instead of LBKP. In this case, the synthetic fiber content in the kitchen towel sheet 1x is preferably 5% to 45%, more preferably 9% to 38%, and even more preferably 12% to 28%. If the synthetic fiber content is less than 5%, it will be difficult to hydroentangle the pulp fibers, as described below, resulting in a large amount of paper dust in the kitchen towel sheet 1x. If the synthetic fiber content exceeds 45%, the water absorption capacity of the kitchen towel sheet 1x will be poor. Furthermore, the pulp fiber content in the kitchen towel sheet 1x is preferably 55% to 95%, more preferably 62% to 91%, and even more preferably 72% to 88%. If the pulp fiber content is less than 55%, the kitchen towel sheet 1x will have poor water absorption, and if the pulp fiber content exceeds 95%, the kitchen towel sheet 1x will produce a lot of paper dust.

[0022] Furthermore, the kitchen towel sheet 1x preferably contains a common wet strength agent. The content of the wet strength agent (in terms of solids (active ingredients)) relative to the pulp fiber (bone dry) is preferably 0.05% to 1.0%, more preferably 0.10% to 0.50%, and even more preferably 0.20% to 0.40%. By setting the wet strength agent content within the above range, a kitchen towel roll 1 having a high basis weight and a predetermined embossing, as in the present application, can be obtained. If necessary, the kitchen towel sheet 1x may contain a heat stabilizer, a lubricant, etc., as long as the purpose of the present invention is not impaired. Examples of heat stabilizers include phenolic stabilizers such as BHT (2,6-di-t-butyl-4-methylphenol).

[0023] (Basic weight) The basis weight of one kitchen towel sheet is 50 g / m 2 More than 200g / m 2 less than 60 g / m 2 More than 170g / m 2 It is preferable that the density is 100 g / m or less. 2 More than 140g / m 2 It is more preferable that the basis weight of one kitchen towel sheet is 50 g / m or less. 2 If the grammage is less than 200 g / m, the water absorption capacity of the kitchen towel sheet 1x will be poor, and if the grammage is less than 200 g / m, the water absorption capacity of the kitchen towel sheet 1x will be poor. 2 If you exceed this, there will be a lot of paper dust from 1 kitchen towel sheet.

[0024] The basis weight of the synthetic fiber contained in 1 kitchen towel sheet is 8 g / m 2 More than 55g / m 2 Preferably, it is 12 g / m or less. 2 More than 45g / m 2 More preferably, it is 15 g / m or less. 2 More than 38g / m 2 It is more preferable that the basis weight of the synthetic fiber is 8 g / m or less. 2If the pulp fiber is less than 55 g / m², it will be difficult to hydroentangle the pulp fibers as described below, resulting in a large amount of paper powder in the kitchen towel sheet 1x. 2 If it exceeds this, the absorbency will be inferior to that of 1 kitchen towel sheet. Furthermore, the basis weight of the pulp fiber contained in one kitchen towel sheet is 38 g / m 2 More than 160g / m 2 Preferably, it is 45 g / m or less. 2 More than 140g / m 2 More preferably, it is 60 g / m or less. 2 More than 120g / m 2 It is more preferable that the basis weight of the pulp fiber is 38 g / m or less. 2 If the pulp fiber basis weight is less than 160 g / m, the water absorption capacity of one kitchen towel sheet will be poor. 2 If you exceed this, there will be a lot of paper dust from 1 kitchen towel sheet. The basis weight of the kitchen towel sheet 1x is measured in accordance with JIS P 8124. However, since it is difficult to measure the basis weights of the synthetic fibers and pulp fibers individually after hydroentanglement, as described below, they are measured, for example, by the following method.

[0025] First, prepare a 0.1 M acetic acid solution and a 0.1 M sodium acetate solution. Mix approximately 830 g of the 0.1 M acetic acid solution with approximately 160 g of the 0.1 M sodium acetate solution to adjust the pH to 4. This is the acetate buffer solution. Add Cellulase Onozuka p1500 (manufactured by Yakult Pharmaceutical Co., Ltd.) to this acetate buffer solution so that the amount added is 1 wt%. 50 ml of acetate buffer containing Cellulase Onozuka P1500 and 0.5 g of 1x kitchen towel sheet were placed in a vial and tightly capped. After shaking at 180 rpm and 40°C for 24 hours, the synthetic fiber was sampled from the vial and its mass was measured. The basis weights of the synthetic fiber and pulp fiber were calculated using the mass (0.5 g) of 1x kitchen towel sheet (including synthetic fiber and pulp fiber) and the mass of the sampled synthetic fiber using the following formula: Synthetic fiber basis weight = Basis weight of 1x kitchen towel sheet x (mass of synthetic fiber / mass of 1x kitchen towel sheet) Pulp fiber basis weight = Basis weight of 1x kitchen towel sheet x [(mass of 1x kitchen towel sheet - mass of synthetic fiber) / mass of 1x kitchen towel sheet]

[0026] Furthermore, if it is difficult to measure using the above method, the basis weight of the kitchen towel sheet 1x measured according to JIS P 8124 - the basis weight of the synthetic fibers used = the basis weight of the pulp fibers. However, since the basis weights of the raw fabric (base paper) after hydroentanglement and the embossed kitchen towel sheet 1x will differ (the basis weight will be lower after embossing), the final basis weights of the synthetic fibers and pulp fibers will be determined by correcting as follows: For example, the basis weight of synthetic fibers is 26 g / m 2 The basis weight of the base paper after hydroentanglement is 128 g / m 2 The basis weight of one embossed kitchen towel sheet is 125g / m 2 In this case, the basis weight of the synthetic fiber is 26×125 / 128=25g / m 2 , the basis weight of pulp fiber is 125-25=100g / m 2 Let's say.

[0027] (Paper thickness and specific volume) The thickness of the kitchen towel sheet 1x is preferably 0.45 mm to 1.8 mm, more preferably 0.55 mm to 1.45 mm, and even more preferably 0.75 mm to 1.2 mm. A thickness less than 0.45 mm results in poor water absorption, while a thickness greater than 1.8 mm results in excessive paper dust. Paper thickness is measured using a thickness gauge (Ozaki Seisakusho Co., Ltd.'s "PEACOCK" dial thickness gauge). The measurement conditions are a load of 3.7 kPa, a probe diameter of 30 mm, and a sample placed between the probe and the measuring table. The gauge reading is taken when the probe is lowered at a rate of 1 mm per second or less. Measurements are repeated 10 times and the results are averaged. Measurements are performed with three kitchen towel sheets 1x stacked on top of each other, and the measured value is divided by three to determine the paper thickness. In addition, the specific volume of one kitchen towel sheet is 5cm 3 / g or more 15cm 3 / g or less, and 3 / g or more 13cm 3 / g or less is more preferable, and 3 / g or more 11cm 3 / g or less is more preferable. 3 If the absorbency is less than 1 / g, the absorbency of one kitchen towel sheet will be inferior, and the absorbency will be 15cm. 3 If the density exceeds / g, there will be a lot of paper dust in the kitchen towel sheet. The specific volume is calculated by dividing the paper thickness of the kitchen towel sheet by the basis weight, and then expressing the volume cm per unit g. 3 It is expressed as:

[0028] (Embossed) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed, preferably using a roll winder. The shape of the embossed portion can be any shape, including circles, ellipses, rectangles, squares, floral patterns, polygons, letters, lines, logos, etc., without any particular restrictions. To obtain a kitchen towel sheet 1x with a high basis weight and a predetermined embossing, as in the present invention, a hexagonal shape is preferred. The embossing depth is 0.1 mm to 2 mm, preferably 0.3 mm to 1.5 mm, and more preferably 0.5 mm to 1.0 mm. If the embossing depth is less than 0.1 mm, the embossing becomes too small, making it difficult to scrape off paper dust with the embossed portions (concave sections), and the shallow embossing increases the contact area when wiping with the sheet, resulting in more paper dust. If the depth exceeds 2 mm, the roll must be wound loosely to ensure the embossing depth, resulting in a shorter roll length of the kitchen towel roll 1.

[0029] The depth of the embossment is measured using a microscope. The microscope used can be a Keyence One-Shot 3D Measuring Macroscope VR-3100. The microscope image observation, measurement, and image analysis software can be the VR-H1A. The measurement conditions are a magnification of 12x and a field of view of 24mm x 18mm. The measurement magnification and field of view can be changed as needed depending on the desired size of the embossment.

[0030] Figure 2 shows a height profile on the XY plane taken with a microscope, with the height of the sheet surface represented by shading. The hexagonal areas in Figure 2 that are shaded differently from the surrounding area represent individual embossments. The depth of the embossment is determined by measuring the height difference of the embossment using the microscope. The measurement is performed on the surface 1a side of the kitchen towel sheet 1x. Furthermore, when measuring, three laps of the kitchen towel sheet 1x are removed from the kitchen towel roll 1, and the fourth lap of the sheet is used to measure the sheet. Furthermore, if there are perforations, the measurement is performed while avoiding the perforations. First, a line segment AB is drawn as shown in Figure 2, and the height profile shown in Figure 3 is obtained. Line segment AB should be drawn across the embossments. Line segment AB is drawn in the width direction of the kitchen towel, but if the spacing between embossments is, for example, 2 mm or more, the line segment may be drawn diagonally or in the machine direction. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sheet sample surface. However, it also contains noise (steep peaks due to fiber clumps on the sheet surface, whisker-like fibers, or fiber-free areas). Therefore, when calculating the height difference of the unevenness, it is necessary to remove such noise peaks. Therefore, the (measured) cross-sectional curve S in Figure 3 was smoothed using the weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 4. Note that smoothing using the weighted average radio button filter can be achieved automatically using the analysis software mentioned above. Then, in the graph shown in Figure 4, the average of the maximum values ​​on the vertical axis of the convex portion H1 and the convex portion H2 adjacent to H1 was calculated, and the minimum value on the vertical axis of the concave portion D1 sandwiched between H1 and H2 was determined. The value obtained by subtracting the minimum value from the average of the maximum values ​​thus obtained was used as the provisional embossing depth. Then, as shown in Figure 4, similar measurements were performed at two consecutive locations on the cross-sectional curve (D1 and the concave portion D2 sandwiched between H2 and the convex portion H3) (two consecutive locations at this point). Next, the kitchen towel sheet 1x is rotated 90 degrees in the flow direction three times, and the same measurements are taken at each position (for a total of four measurement positions in the flow direction), and the average value of the total eight positions (2 x 4) is finally used as the embossing depth.

[0031] (Water absorption) In the present invention, 1 m of kitchen towel sheet 1x 2 The water absorption per m is preferably 270 g or more and 600 g or less, more preferably 310 g or more and 560 g or less, and even more preferably 360 g or more and 490 g or less. 2 If the water absorption per sheet is less than 270g, the water absorption will be inferior to that of Kitchen Towel Sheet 1x, and if it exceeds 600g, Kitchen Towel Sheet 1x will produce a lot of paper dust. Furthermore, the water absorption per gram of the kitchen towel sheet 1x is preferably 2.5 g to 5.7 g, more preferably 2.9 g to 5.3 g, and even more preferably 3.3 g to 4.8 g. If the water absorption per gram is less than 2.5 g, the water absorption per gram of the kitchen towel sheet 1x is inferior. The water absorption of each kitchen towel sheet 1x is measured as follows.

[0032] First, a kitchen towel sheet 1x is taken and cut using a square template with each piece measuring 7.6 cm (3 inches) to prepare a rectangular test piece 200 with each side measuring 7.6 cm. Thereafter, the mass of the test piece 200 before water absorption is measured using an electronic balance. Then, the test piece 200 is set in a holder 220 (a jig that fixes three points of the test piece 200, and the jig is made of a metal that does not absorb water). Next, distilled water was poured into a commercially available tray to a depth of 2 cm, and the test specimen 200 placed in the holder 220 was immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test specimen 200 and holder 220 were removed from the distilled water, and a band 210 was attached to one corner 200d of the test specimen 200 as shown in Figure 5. The band 210 was made by cutting the same kitchen towel sheet 1x as the sample to be measured into a size of 2 mm wide x 15 mm long and attaching it to a section 6 mm from corner 200d toward the center of the test specimen 200. Next, the holder 220 and test specimen 200 were hung from a rod installed in an empty water tank with the corner 200a opposite corner 200d facing up, and the lid of the water tank was closed and left for 10 minutes. The holder 220 and test specimen 200 were then removed from the water tank, the band 210 and holder 220 were removed, and the mass of the test specimen 200 was measured using an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, the 1 m 2 Absorption of distilled water per unit (g(water) / m 2 (paper)) and calculate 1m 2 Water absorption per unit (g (water) / m 2 ( Sheet )) by the basis weight of the test piece 200 to obtain 1 m 2 Water absorption per unit (g (water) / m 2 ( Sheet )) / Basic weight(g( Sheet ) / m 2 ( Sheet )) = Water absorption per 1g (g(water) / g( Sheet )) is calculated. Measurements are carried out five times for each sample, and the average value is used. This measurement is performed in accordance with JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0033] (DMDT and DCDT) The tensile strength in the MD direction (DMDT) of the kitchen towel sheet 1x when dry according to JIS P 8113 is preferably 15 N / 25 mm to 115 N / 25 mm, more preferably 20 N / 25 mm to 100 N / 25 mm, and even more preferably 35 N / 25 mm to 80 N / 25 mm. Furthermore, the tensile strength in the CD direction (DCDT) when dry is preferably 4 N / 25 mm to 80 N / 25 mm, more preferably 6 N / 25 mm to 65 N / 25 mm, and even more preferably 10 N / 25 mm to 50 N / 25 mm. If the DMDT is less than 15 N / 25 mm or the DCDT is less than 4 N / 25 mm, the strength of the kitchen towel sheet 1x is insufficient, making it prone to tearing and difficult to reuse. If the DMDT exceeds 115N / 25mm or the DCDT exceeds 80N / 25mm, the basis weight increases, and in both cases the amount of paper dust in the kitchen towel sheet 1x increases. In this case, the MD direction and CD direction refer to the manufacturing direction (machine direction) of the kitchen towel sheet 1x during manufacturing, and the CD direction refers to a direction perpendicular to the MD direction.

[0034] Furthermore, the ratio (DMDT / DCDT) of the tensile strength in the machine direction (MD) of the kitchen towel sheet 1x when dry to the tensile strength in the CD direction (DCDT) when dry is preferably 1.2 or more and 4.5 or less, more preferably 1.4 or more and 4.0 or less, and even more preferably 1.6 or more and 3.5 or less. If the ratio is less than 1.2, the proportion of synthetic fibers will be high, resulting in poor water absorption. If the ratio is more than 4.5, the DCDT will be low, which may make the kitchen towel sheet 1x more prone to tearing and making it difficult to reuse.

[0035] (WMDT and WCDT) The wet MD tensile strength (WMDT) of the kitchen towel sheet 1x, based on the old JIS S 3104, is preferably 13N / 25mm to 100N / 25mm, more preferably 18N / 25mm to 85N / 25mm, and even more preferably 25N / 25mm to 73N / 25mm. The wet CD tensile strength (WCDT) is preferably 3N / 25mm to 65N / 25mm, more preferably 4N / 25mm to 55N / 25mm, and even more preferably 9N / 25mm to 45N / 25mm. If the WMDT is less than 13N / 25mm or the WCDT is less than 3N / 25mm, the kitchen towel sheet 1x will be prone to tearing and difficult to reuse. If the WMDT exceeds 100N / 25mm or the WCDT exceeds 65N / 25mm, the basis weight will increase, resulting in more paper dust in the kitchen towel sheet 1x.

[0036] Furthermore, the ratio (WMDT / WCDT) of the wet tensile strength in the machine direction (MD) (WMDT) to the wet tensile strength in the cross direction (WCDT) of the kitchen towel sheet 1x is preferably 1.3 to 4.6, more preferably 1.5 to 4.1, and even more preferably 1.7 to 3.6. If the ratio is less than 1.3, the proportion of synthetic fibers will be high, resulting in poor water absorption. If the ratio is more than 4.6, the kitchen towel sheet 1x will be prone to tearing and difficult to reuse.

[0037] Furthermore, the ratio of the wet MD tensile strength (WMDT) of the kitchen towel sheet 1x to the dry MD tensile strength (DMDT) ((WMDT / DMDT) × 100(%)) is preferably 50% to 95%, more preferably 65% ​​to 93%, and even more preferably 70% to 91%. Similarly, the ratio of the wet CD tensile strength (WCDT) of the kitchen towel sheet 1x to the dry CD tensile strength (DCDT) ((WCDT / DCDT) × 100(%)) is preferably 43% to 89%, more preferably 60% to 86%, and even more preferably 65% ​​to 83%. If the (WMDT / DMDT) ratio is less than 50% or the (WCDT / DCDT) ratio is less than 43%, the kitchen towel sheet 1x will tear easily and will be difficult to reuse. If the ratio of (WMDT / DMDT) exceeds 95% or the ratio of (WCDT / DCDT) exceeds 89%, the proportion of synthetic fibers will be high, resulting in poor water absorption.

[0038] (Elongation at break) The breaking elongation in the MD direction of the kitchen towel sheet 1x is preferably 20% to 65%, more preferably 28% to 53%, and even more preferably 33% to 48%. The breaking elongation in the CD direction of the kitchen towel sheet 1x is preferably 50% to 100%, more preferably 60% to 95%, and even more preferably 70% to 90%. By keeping the breaking elongation in the MD or CD direction of the kitchen towel sheet 1x within the above ranges, a reusable kitchen towel roll 1 with high water absorption and low paper dust can be obtained. The breaking elongation in each direction of the kitchen towel sheet 1x is measured according to JIS P 8113.

[0039] 3. Manufacturing method of kitchen towel sheet and kitchen towel roll The kitchen towel sheet 1x and the kitchen towel roll 1 can be manufactured, for example, by (1) laminating pulp fibers onto a predetermined spunbond nonwoven fabric and hydroentangling it, (2) embossing it, and (3) winding it into a roll. In this case, (1) in the hydroentanglement step, pulp fibers are hydroentangled with synthetic fibers to obtain a nonwoven fabric containing synthetic fibers and pulp fibers. The hydroentanglement method is preferably performed using, for example, the method described in JP 2018-193634 A. In addition, in (2) the embossing step, it is preferable to perform a thermal embossing treatment using a matched steel (steel match) with a roll winder. The embossing pattern is preferably a hexagonal shape.

[0040] 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 and examples. 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]

[0041] 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.

[0042] The kitchen towel rolls of Examples 1 to 15 and Comparative Examples 1 to 7 listed in Table 2 were produced through the steps of (1) hydroentanglement, (2) embossing, and (3) roll winding. A commercially available two-ply kitchen towel roll was also prepared. The above-mentioned parameters were measured for all of the above kitchen towel rolls of the Examples, Comparative Examples, and commercially available products, and the following evaluations were performed. Although not specifically listed as parameters in Table 2 below, because the calendering conditions were standardized, kitchen towel sheets with higher basis weights tend to have lower specific volumes. Paper dust amount: A sensory evaluation of paper dust amount was conducted by 30 people. When wiping dishes using the kitchen towel sheet and kitchen towel roll, the amount of paper dust that adhered to the hands or to the wiped dishes was evaluated as follows: Particularly excellent (significantly little): 5 points, Excellent (little): 4 points, Good (no problem): 3 points, Poor (a lot): 2 points, Particularly poor (significantly much): 1 point The average value of 30 people was calculated and rounded to one significant digit.

[0043] Water absorption: Measured by the method described above, and evaluated based on each measured value as shown in Table 1 below. [Table 1]

[0044] Winding length: The winding length was measured and evaluated as follows. Less than 4m: 1 point 4m or more but less than 5m: 2 points 5m or more but less than 7m: 3 points 7m or more but less than 8m: 4 points 8m or more: 5 points

[0045] [Table 2]

[0046] As shown in Table 2, the kitchen towel rolls of Examples 1 to 16 all had excellent water absorption, sufficient winding length, and little paper dust. On the other hand, the kitchen towel rolls of Comparative Examples 1 to 7 had low water absorption, short winding length, or large amounts of paper dust. As described above, the kitchen towel roll of the present invention can provide a reusable kitchen towel roll that has a high water absorption capacity, produces little paper dust, and has a roll length of at least a certain level. [Explanation of symbols]

[0047] 1 kitchen towel roll 1a surface 1b back side 1e The outermost edge of the kitchen towel sheet 1x kitchen towel sheet 200 specimens 200a, 200d corner 210 Obi 220 Holder

Claims

1. A kitchen towel roll is a roll of a one-ply kitchen towel sheet made of a nonwoven fabric obtained by hydroentangling synthetic fibers with pulp fibers and then embossing the nonwoven fabric. The synthetic fiber has a basis weight of 13 g / m ２ 45g / m or more ２ and the pulp fiber has a basis weight of 48 g / m or less. ２ 135g / m or more ２ is as follows: The kitchen towel sheet has a basis weight of 61 g / m ２ More than 168g / m ２ is as follows: The content of the synthetic fiber in the kitchen towel sheet is 10% or more and 36% or less, and the content of the pulp fiber is 64% or more and 86% or less, The depth of the embossment formed by the embossing is 0.33 mm or more and 1.44 mm or less, The kitchen towel roll has a roll length of 7.3 m or more and 19.8 m or less, The kitchen towel sheet has a tensile strength in the MD direction (DMDT) of 15 N / 25 mm or more and 115 N / 25 mm or less when dry, The dry tensile strength in the CD direction (DCDT) of the kitchen towel sheet is 4 N / 25 mm or more and 80 N / 25 mm or less, The ratio (DMDT / DCDT) of the tensile strength in the MD direction (DMDT) when dry to the tensile strength in the CD direction (DCDT) when dry of the kitchen towel sheet is 1.2 or more and 4.5 or less, The wet tensile strength (WMDT) of the kitchen towel sheet in the machine direction is 13 N / 25 mm or more and 100 N / 25 mm or less, The wet CD tensile strength (WCDT) of the kitchen towel sheet is 3 N / 25 mm or more and 65 N / 25 mm or less, The ratio (WMDT / WCDT) of the wet tensile strength in the machine direction (MD) to the wet tensile strength in the CD direction (WCDT) of the kitchen towel sheet is 1.3 or more and 4.6 or less, The ratio of the wet MD tensile strength (WMDT) of the kitchen towel sheet to the dry MD tensile strength (DMDT) ((WMDT / DMDT) x 100(%)) is 50% or more and 95% or less, The ratio of the wet CD tensile strength (WCDT) to the dry CD tensile strength (DCDT) of the kitchen towel sheet ((WCDT / DCDT) x 100(%)) is 43% or more and 89% or less, The breaking elongation of the kitchen towel sheet in the MD direction is 20% or more and 65% or less, A kitchen towel roll characterized in that the breaking elongation of the kitchen towel sheet in the CD direction is 50% or more and 100% or less.

2. The roll density of the kitchen towel roll is 0.06 g / cm ３ 0.19g / cm or more ３ 2. The kitchen towel roll of claim 1, wherein:

3. 1m of the kitchen towel sheet ２ 3. The kitchen towel roll according to claim 1, wherein the amount of water absorption per 1 g is 270 g or more and 600 g or less, and the amount of water absorption per 1 g is 2.5 g or more and 5.7 g or less.

4. 4. The kitchen towel roll according to claim 1, wherein the thickness of the kitchen towel sheet is 0.45 mm or more and 1.8 mm or less.

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