Kitchen towel and package thereof

Abstract

To provide a kitchen towel roll, even in a case of a long kitchen towel roll, having excellent softness, easily attached to a paper holder, minimizing a quality difference between inner and outer winding of the roll, and having excellent water absorbency.SOLUTION: A kitchen towel roll is formed by winding up a kitchen towel into a roll with perforations along the width and across the full length for cutting into a single sheet. Problems of the kitchen towel roll are solved by specifying the paper thickness and absorbency of kitchen towels, a ratio of a perforation pitch length of an innermost winding to that of an outermost winding when unwinding a kitchen towel roll, and the roll length of the kitchen towel roll.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to kitchen towel rolls and packaging thereof. [Background technology]

[0002] In recent years, various kitchen towels and kitchen towel rolls have been developed and sold. Kitchen towels are used for a wide range of purposes, including cooking and cleaning, and are used frequently, so they are becoming longer in length. However, high-quality products require not only longer lengths but also higher quality.

[0003] Kitchen towels have excellent absorbency, but because they are thick, if they are tightly rolled to reduce the roll diameter, the sheet becomes crushed, resulting in poor texture and absorbency, lowering quality and making the product seem cheap. Furthermore, because the sheet becomes crushed and its absorbency deteriorates, there is also the problem of increasing the amount used per use. Therefore, it was necessary to improve the quality of the sheet by creating an embossed or other uneven surface on the kitchen towel.

[0004] For example, the TAD (through air drying) kitchen towel disclosed in Patent Document 1 is known to have good softness and absorbency. TAD kitchen towels have embossed surfaces and unevenness due to the papermaking process, making them thick, soft, and highly absorbent. Therefore, even if the perforation pitch (sheet length) on the sheet is shortened and the sheet area is reduced, the sheet still has sufficient absorbency.

[0005] On the other hand, TAD kitchen towels are thick and bulky. Therefore, if the length per roll is increased (lengthened) to make them more compact, the beginning of the roll (inner wrapping), which is more easily compressed, will not be able to maintain the quality (softness, bulk, absorbency) that is unique to TAD. This also creates a difference in quality between the end of the roll (outer wrapping), which is less easily compressed. Furthermore, the tension applied when processing the paper into a roll makes it easy for the paper to stretch, leading to fluctuations in quality.

[0006] Therefore, by winding the paper softly at the beginning, the quality unique to TAD can be ensured, but this then creates the problem of the roll diameter becoming larger, making it difficult to attach to the paper holder. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2024-016101 Summary of the Invention [Problem to be solved by the invention]

[0008] To provide a kitchen towel roll which has been made in view of the above circumstances, and which is excellent in softness even when it is a long kitchen towel roll, is easy to attach to a paper holder, has little difference in quality between the inside and outside windings of the roll, and has good water absorbency. [Means for solving the problem]

[0009] The inventors conducted extensive research and discovered that the above-mentioned problems can be solved by specifying the paper thickness and water absorption capacity of the kitchen towel, the ratio of the perforation pitch of the innermost roll to the perforation pitch of the outermost roll when the kitchen towel roll is unwound, and the roll length of the kitchen towel roll, in a kitchen towel roll having perforations along the width direction and along the entire length for cutting into single sheets, and thus completed the present invention.

[0010] (1) The first aspect of the present invention is a kitchen towel roll in which a kitchen towel having perforations along the width direction and the entire length for cutting into a single sheet is wound into a roll, and the kitchen towel has a paper thickness of 2.29 mm or more and 4.25 mm or less per 10 plies, and a water absorption per unit area of ​​300 g / m 2 More than 700g / m 2When the kitchen towel roll is unwound, the pitch of the perforations in the innermost 10 sheets is P1 and the pitch of the perforations in the outermost 10 sheets is P2, and the pitch ratio (P1 / P2) is 0.960 or more and 1.033 or less, and the roll length is 18 m or more and 45 m or less.

[0011] (2) A second aspect of the present invention is the kitchen towel roll according to (1), characterized in that the roll diameter is 130 mm or more and 170 mm or less.

[0012] (3) A third aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein the basis weight of the product ply of the kitchen towel is 30 g / m 2 More than 59g / m 2 It is characterized by the following:

[0013] (4) A fourth aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein the specific volume of the kitchen towel is 7.7 g / cm 3 More than 24.5g / cm 3 It is characterized by the following:

[0014] (5) The fifth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the water absorption per unit mass of the kitchen towel is 5.0 g / g or more and 20.0 g / g or less.

[0015] (6) A sixth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the kitchen towel is wound around a core, and the roll mass per 280 mm of roll width excluding the core is 170 g or more and 550 g or less.

[0016] (7) A seventh aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein the winding density is 0.20 m / cm 2 More than 0.56m / cm2 It is characterized by the following:

[0017] (8) The eighth aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein the roll density is 0.045 g / cm 3 More than 0.120g / cm 3 It is characterized by the following:

[0018] (9) A ninth aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein when the kitchen towel roll is unwound, the area of ​​the single sheet at the innermost roll is 280 cm 2 More than 600cm 2 It is characterized by the following:

[0019] (10) A tenth aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein when the kitchen towel roll is unwound, the area of ​​the outermost sheet is 280 cm 2 More than 600cm 2 It is characterized by the following:

[0020] (11) The eleventh aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the ratio of the area of ​​one sheet of the innermost roll to the amount of water absorption per unit area is 0.72 or more and 1.77 or less.

[0021] (12) The twelfth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that the ratio of the area of ​​one sheet of the outermost roll to the amount of water absorption per unit area is 0.72 or more and 1.77 or less.

[0022] (13) A thirteenth aspect of the present invention is the kitchen towel roll according to (1) or (2), characterized in that the kitchen towel has a linear embossed pattern.

[0023] (14) The fourteenth aspect of the present invention is a kitchen towel roll according to (1) or (2), characterized in that P1 is 1750 mm or more and 1815 mm or less, and P2 is 1754 mm or more and 1822 mm or less.

[0024] (15) A fifteenth aspect of the present invention is a package that contains two or three kitchen towel rolls according to (1) or (2). [Effects of the Invention]

[0025] According to the present invention, it is possible to provide a kitchen towel roll that is excellent in softness even when it is long, is easy to attach to a paper holder, has little difference in quality between the inside and outside wrapping of the roll, and has good water absorbency. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Figure 2] FIG. 1 is a plan view showing an example of a sheet obtained by cutting a kitchen towel along perforations. [Figure 3] FIG. 1 is a diagram showing an example of an embossing pattern for a kitchen towel. [Figure 4] FIG. 1 is a diagram showing a method for measuring the water absorption of a kitchen towel. [Figure 5] FIG. [Figure 6] FIG. 1 is a diagram showing a part of the papermaking process for kitchen towels. [Figure 7] FIG. 1 is a perspective view of a package containing three kitchen towel rolls. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, one embodiment of the present invention will be described in detail. However, the following embodiment is presented for illustrative purposes, and the present invention is not limited to the embodiment shown below.

[0028] In this specification, the term "kitchen towel roll" (hereinafter simply referred to as "roll") refers to a roll product in which kitchen towels are wound into a roll. The term "sheet" refers to a sheet-like product in which kitchen towels are pulled out from a kitchen towel roll and cut along the perforations.

[0029] "Product ply" refers to a kitchen towel in which the number of plies is in the product state, without peeling off the laminated plies into a single piece.

[0030] "MD direction" refers to the direction in which the paper runs through the machine, and "CD direction" refers to the direction perpendicular to the MD direction. In this specification, "MD direction of the roll product" refers to the direction in which the kitchen towel is wound (Y direction in Figure 1), and "CD direction of the roll product" refers to the direction perpendicular to the direction in which the kitchen towel is wound (X direction in Figure 1). "Axial direction" and "cross direction" refer to the axial direction of the roll product, which is the CD direction of the roll product (X direction in Figure 1).

[0031] <Kitchen towel roll> As shown in FIG. 1, the kitchen towel roll 1 of the present invention is a roll of kitchen towel 1x having perforations 1c along the width direction and over the entire length for cutting into a single sheet.

[0032] The kitchen towel roll 1 can be used, for example, as a roll of kitchen paper (sometimes called kitchen 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.

[0033] The details of each component are as follows:

[0034] <Kitchen towel> Kitchen towel 1x can be made by going through a papermaking process, stacking base papers, embossing if necessary, and then winding them into a roll to form roll 1. Alternatively, the base papers may be embossed before being stacked and wound into roll 1.

[0035] The kitchen towel 1x is preferably produced by a TAD (through-air drying) papermaking method, which is a method in which the papermaking process involves drying by ventilation (preferably without press-dehydrating the wet paper) in the dehydration and drying step. By producing the kitchen towel 1x by the TAD papermaking method, it is possible to obtain a bulky, soft, and highly absorbent kitchen towel 1x.

[0036] (raw materials) The kitchen towel 1x contains pulp fibers. The ratio of NBKP to LBKP in the pulp fibers is preferably NBKP:LBKP=40:60 to 100:0, more preferably NBKP:LBKP=50:50 to 90:10, and even more preferably NBKP:LBKP=60:40 to 80:20. If the NBKP content is 40% or more, the kitchen towel 1x will be less likely to tear when absorbing water, and if LBKP is included, costs can be reduced.

[0037] (wet pulp) The proportion (content) of wet pulp fibers in the kitchen towel 1x is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more. If the proportion of wet pulp fibers is 50% by mass or more, the kitchen towel 1x will have good water absorbency.

[0038] (Uneven pattern resulting from the papermaking process) The surface of the kitchen towel 1x preferably has an uneven pattern 11 resulting from the papermaking process, as shown in Figure 2. The presence of the uneven pattern 11 resulting from the papermaking process improves the water absorbency of the kitchen towel 1x. The processing of the uneven pattern 11 resulting from the papermaking process will be described later.

[0039] (embossed pattern) The kitchen towel 1x preferably has an embossed pattern 12 as shown in Figures 2 and 3, and more preferably has linear embossments 12a. The embossed pattern 12 improves the aesthetic appeal of the roll 1. Furthermore, by having the embossed pattern 12 be linear rather than dotted, the bulk of the roll 1 is reduced, the winding diameter does not become too large, and it is easier to attach to a paper holder. Note that "linear" refers to the embossed pattern 12 having a thickness of 0.1 mm to 4 mm and a length of 5 mm or more.

[0040] (Number of plies) The kitchen towel 1x according to this embodiment preferably has two or more plies and three or less, with two plies being more preferred. If the kitchen towel 1x has only one ply, there will be no gaps between the sheets, resulting in poor absorbency. If the kitchen towel 1x has more than three plies, the basis weight of each ply will be low, the wet strength agent will not adhere to the fibers, and the papermaking process will be contaminated. Furthermore, the paper thickness will increase, resulting in poor sheet softness, and the roll diameter will increase, making it difficult to attach to a paper holder.

[0041] (paper thickness) The paper thickness per 10 plies of the kitchen towel 1x (hereinafter simply referred to as "paper thickness") is 2.29 mm or more and 4.25 mm or less. If the paper thickness is less than 2.29 mm, the absorbency of the kitchen towel 1x will be poor, and if it exceeds 4.25 mm, the softness of the kitchen towel 1x will be poor. The lower limit of the paper thickness is preferably 2.70 mm or more, and more preferably 2.75 mm or more. The upper limit is preferably 3.75 mm or less, and more preferably 3.65 mm or less.

[0042] Paper thickness is measured using the following method. A thickness gauge (Ozaki Seisakusho Co., Ltd., "PEACOCK" dial thickness gauge) is used. The measurement conditions are a measurement 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. To measure the thickness of a 10-ply sheet, 10 plies (5 sets of 2-ply sheets) are stacked and measured 10 times, and the results are averaged. For a 3-ply sheet, 9 plies (3 sets of 3-ply sheets) are stacked and measured, and the thickness of one ply is calculated from the measurement results and converted to 10 plies. Paper thickness is measured at 10 points: five different points in the MD (Y direction in Figure 1) of the sheet, and five points shifted from these five points in the CD (X direction in Figure 1). It is important to measure the paper thickness at 10 different points, but the exact position is not important.

[0043] (Basic weight) The basis weight of the product ply for one kitchen towel is 30 g / m 2 More than 59g / m 2 The basis weight is preferably 30 g / m or less. 2 If it is less than this, the absorbency of one kitchen towel will be poor, and it will be 59 g / m 2 Above this, the softness of a 1x kitchen towel will be inferior. The minimum basis weight is 38 g / m 2 More preferably, 40 g / m 2 More preferably, the upper limit is 54 g / m 2 Less than 51 g / m is more preferable. 2 The following is more preferable: The basis weight is measured in accordance with JIS P 8124.

[0044] (specific volume) The specific volume of one kitchen towel is 7.7cm 3 / g or more 24.5cm 3 / g or less is preferable. The specific volume of 1 kitchen towel is 7.7 cm 3 If the specific volume is less than 24.5 cm3 / g, the absorbency of one kitchen towel is poor. 3If the specific volume exceeds 9.8 cm / g, the roll diameter becomes too large and it becomes difficult to attach the roll 1 to the paper holder. 3 / g or more is more preferable, and 11.5cm 3 / g or more is more preferable. The upper limit is 21.0 cm 3 / g or less is more preferable, and 20.0 cm 3 The specific volume is calculated by dividing the paper thickness of a predetermined number of plies (for example, product plies) of one kitchen towel by the basis weight of the predetermined number of plies, and then expressing the volume cm per unit g. 3 It is expressed as:

[0045] (Water absorption <unit area>) The water absorption per unit area of ​​one kitchen towel (hereinafter referred to as "water absorption <unit area>") is 300g / m 2 More than 700g / m 2 Water absorption <unit area> is 300g / m or less. 2 If it is less than 700 g / m, the absorbency of one kitchen towel will be poor. 2 Above this level, the softness of a single kitchen towel will be reduced. The lower limit of water absorption capacity (unit area) is 390g / m 2 More than 430g / m 2 More preferably, the upper limit is 600 g / m 2 Preferably less than 550 g / m 2 The following is more preferred:

[0046] (Water absorption <unit mass>) The water absorption per unit mass of a kitchen towel 1x (hereinafter also referred to as "water absorption <unit mass>") is preferably 5.0 g / g or more and 20.0 g / g or less. If the water absorption <unit mass> is less than 5.0 g / g, the water absorbency of the kitchen towel 1x will be poor, and if it exceeds 20.0 g / g, the softness of the kitchen towel 1x will be poor. The lower limit of the water absorption <unit mass> is more preferably 8.5 g / g or more, and even more preferably 9.0 g / g or more. The upper limit is more preferably 14.0 g / g or less, and even more preferably 11.3 g / g or less.

[0047] The water absorption of 1x kitchen towel is measured according to the following method (see Figure 4). (1) Two plies of kitchen towel are taken and cut using a square template with one piece measuring 76 mm to prepare a rectangular test piece 20 with one side measuring 76 mm. (2) The mass of the test piece 20 before water absorption is measured using an electronic balance. (3) The test piece 20 is set in a holder 21 (a jig for fixing three points of the test piece 20, the jig being made of a metal that does not absorb moisture). (4) Distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 20 set in the holder 220 is immersed in the distilled water for 2 minutes. (5) Remove the test piece 20 together with the holder 21 from the distilled water, hang the holder 21 and test piece 20 on a rod placed in an empty water tank with the corner 20a facing up, close the lid of the water tank, and leave for 5 minutes. (6) The holder 21 and the test piece 20 are taken out of the water tank, the holder 21 is removed, and the mass of the test piece 20 is measured using an electronic balance.

[0048] Measurements are taken five times for each sample, and the average value is used. It is preferable to measure the three-ply kitchen towel 1x using the same procedure as for the two-ply method. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0049] (Calculation method for water absorption <unit area>) The water absorption amount <unit area> was calculated from the change in mass of the test piece 20 before and after immersion in distilled water, and was calculated as the amount of distilled water absorbed per unit area of ​​the test piece 20 (water g / sheet m 2 , 1m 2 Per. Abbreviated as g / m 2 (See formula (1) below.) Water absorption amount <unit area> = (change in mass of test piece 20) ÷ (area of ​​test piece 20) (1)

[0050] (Calculation method for water absorption <unit mass>) Water absorption capacity (unit mass) is calculated by multiplying the water absorption capacity (unit area) by g of water / sheet m 2) is divided by the basis weight of the product ply of the test piece 20 to calculate the water absorption <unit mass> (g of water / g of sheet, per 1g, abbreviated as g / g) (see formula (2) below). Water absorption amount <unit mass> = (water absorption amount <unit area>) ÷ (basis weight of product ply) (2)

[0051] (perforation) The kitchen towel 1x has perforations 1c that run parallel to the width of the towel at regular intervals across its entire width to allow for cutting into sheets of a suitable size for use. The perforations 1c are formed by alternating succession of cut portions 15a and connecting portions 15b, as shown in Figure 5. The arrangement of the cut portions 15a and connecting portions 15b in the perforations 1c may be curved, but is preferably linear.

[0052] <Kitchen towel roll> As shown in FIG. 1, the kitchen towel roll 1 of this embodiment is a kitchen towel 1x wound into a roll, and has a core 1d in the center, such as a cylindrical paper core or a cylindrical space, with the outer diameter (winding diameter) of the roll 1 being DR, the width of the roll 1 being W, and the outer diameter of the core 1d being DI.

[0053] (core) The core 1d is located at the center of the roll 1. The core 1d may be a cylindrical paper tube or a cylindrical space. In this embodiment, the core 1d of the roll 1 has a cylindrical paper tube made of multiple layers of base paper, and the kitchen towel 1x is wound around this paper tube. In the following description, unless otherwise specified, the core 1d refers to the core 1d that is a cylindrical paper tube.

[0054] (core material) The core 1d preferably contains BKP (Bleached Kraft Pulp) as the pulp fiber contained in the base paper. The BKP content is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more. If the BKP content is 50% by mass or more, the core 1d is less likely to be crushed and is easier to attach to a paper holder.

[0055] The BKP contained in the core 1d preferably includes LBKP. The LBKP content is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more, based on 100% by mass of BKP. If the LBKP content is 50% by mass or more, the cost of the core 1d can be reduced.

[0056] (Core outer diameter) The outer diameter of the core 1d (DI in Figure 1) (hereinafter simply referred to as "core outer diameter") is preferably 20 mm or more and 60 mm or less. If the core outer diameter is less than 20 mm, it becomes difficult to attach the roll 1 to a paper holder, and if it exceeds 60 mm, the winding diameter of the roll 1 becomes large, making it difficult to attach it to a paper holder. The lower limit of the core outer diameter is more preferably 30 mm or more, and even more preferably 38 mm or more. The upper limit is more preferably 55 mm or less, and even more preferably 50 mm or less.

[0057] The core outer diameter is measured, for example, using a diameter rule (manufactured by Muratec KDS Co., Ltd.). Three rolls 1 are measured and the measurement results are averaged. If there is no core, the diameter of the cylindrical space (center hole) at the center of the roll 1 is considered to be the core outer diameter.

[0058] (roll diameter) The winding diameter (DR in Figure 1) of the roll 1 (hereinafter simply referred to as "winding diameter") is 130 mm or more and 170 mm or less. If the winding diameter DR is less than 130 mm, the roll 1 cannot be made long, and if it exceeds 170 mm, it becomes difficult to attach the roll 1 to a paper holder. The lower limit of the winding diameter is preferably 135 mm or more, and more preferably 142 mm or more. The upper limit is preferably 165 mm or less, and more preferably 156 mm or less. The winding diameter is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Three rolls 1 are measured and the measurement results are averaged.

[0059] (Volume length) The winding length of the roll 1 (hereinafter simply referred to as "winding length") is 18 m or more and 45 m or less. If the winding length is less than 18 m, the roll 1 cannot be made long, and if it exceeds 45 m, the winding diameter of the roll 1 becomes large, making it difficult to attach to a paper holder. The lower limit of the winding length is more preferably 22 m or more, and even more preferably 27 m or more. The upper limit is more preferably 40 m or less, and even more preferably 31 m or less.

[0060] The roll length can be measured using the following method. The "length between perforations 1c" of 1x kitchen towel is taken as the length of one sheet, and the "length of 10 sheets" is measured. Next, the "number of sheets" of 1x kitchen towel in roll 1 is measured, and the "length of 10 sheets" and the "number of sheets" are used to calculate the roll length proportionally. For example, if the length of 10 sheets is 1.80m and the number of sheets is 150, then the result is 1.80m x (150 ÷ ​​10) = 27m.

[0061] (Roll width (W)) The roll width (W in FIG. 1) of the roll 1 (hereinafter simply referred to as "roll width" or "sheet width") is preferably 200 mm or more and 320 mm or less. If the roll width is less than 200 mm, the sheet area becomes small, resulting in poor water absorption and difficulty in use. If the roll width exceeds 320 mm, the sheet area becomes large, increasing the amount used and making use difficult. The lower limit of the roll width is more preferably 220 mm or more, and even more preferably 260 mm or more. The upper limit is more preferably 310 mm or less, and even more preferably 290 mm or less.

[0062] (winding density) The winding density of the roll 1 (hereinafter simply referred to as "winding density") is 0.20 m / cm 2 More than 0.56m / cm 2 The winding density is preferably 0.20 m / cm or less. 2 If the winding density is less than 0.56 m / cm, the roll 1 will be wound loosely and the winding diameter will be large, making it difficult to attach to the paper holder. 2 If the density exceeds 0.23 m / cm, the roll 1 will be tightly wound and the softness of the kitchen towel 1 will be poor. 2More preferably, 0.25 m / cm or more 2 The upper limit is preferably 0.52 m / cm. 2 Less than 0.48m / cm is more preferable. 2 The following is even more preferred:

[0063] The winding density can be calculated using the following formula (3). For example, in the case of a winding length of 20 m, 2 plies, a winding diameter (DR) of 154 mm, and a core outer diameter (DI) of 44 mm, the winding density is (20 m × 2) ÷ {3.14 × (154 mm ÷ 2 ÷ 10)} 2 -3.14×(44mm÷2÷10) 2}=0.23m / cm 2 This becomes: Winding density = (winding length × number of plies) ÷ (cross-sectional area of ​​roll 1) (3) Cross-sectional area of ​​roll 1 = (cross-sectional area of ​​winding diameter part) - (cross-sectional area of ​​core outer diameter part)

[0064] (Roll mass <without core>) The roll mass of the roll 1 without the core 1d per 280 mm of roll width (hereinafter simply referred to as "roll mass <without core>") is preferably 170 g or more and 550 g or less. If the roll mass <without core> is less than 170 g, the basis weight and thickness will be low, and the absorbency of the kitchen towel 1x will be poor. Alternatively, the roll 1 will not be long. If the roll mass <without core> exceeds 550 g, the winding diameter of the roll 1 will be large, making it difficult to attach to a paper holder. The lower limit of the roll mass <without core> is more preferably 280 g or more, and even more preferably 320 g or more. The upper limit is more preferably 450 g or less, and even more preferably 420 g or less. If the roll width is not 280 mm, the mass per 280 mm is converted proportionally.

[0065] (roll density) The roll density of roll 1 (hereinafter also simply referred to as "roll density") is 0.045 g / cm 3 More than 0.120g / cm 3 The roll density is preferably 0.045 g / cm or less. 3If the roll density is less than 0.120 g / cm, the diameter of the roll 1 will be too large and it will be difficult to attach it to the paper holder. 3 If the density exceeds 0.060 g / cm, the roll 1 will be tightly wound and the softness of the kitchen towel 1 will be poor. 3 More preferably, 0.070 g / cm or more 3 The upper limit is 0.095 g / cm. 3 Less than 0.090 g / cm is more preferable. 3 The following is even more preferred:

[0066] The roll density can be calculated by (roll mass (without core)) ÷ (volume of roll 1), and is obtained from the following formula (4). For example, if the roll mass (without core) is 237 g, the winding diameter is 154 mm, and the core outer diameter is 44 mm, the roll density = 237 g ÷ {(3.14 × (154 mm ÷ 2 ÷ 10)} 2 -3.14×(44mm÷2÷10) 2 )×(280mm÷10)}=0.05g / cm 3 The roll width is calculated based on 280 mm. Roll density = roll mass (without core) ÷ [{(cross-sectional area of ​​winding diameter) - (cross-sectional area of ​​core outer diameter)} × roll width] (4)

[0067] (Perforation pitch <innermost roll>) When roll 1 is unwound, the length in the MD direction of the innermost 10 sheets (hereinafter also referred to simply as "perforation pitch <innermost roll>") is P1, and P1 is preferably 1750 mm or more and 1815 mm or less. If P1 is less than 1750 mm, the area per sheet becomes small, resulting in poor water absorbency and difficulty in use. If P1 exceeds 1815 mm, the area per sheet becomes large, increasing the amount used and making it difficult to use. The lower limit of P1 is more preferably 1764 mm or more, and even more preferably 1770 mm or more. The upper limit of P1 is more preferably 1799 mm or less, and even more preferably 1790 mm or less.

[0068] (Perforation pitch <Outermost roll>) When roll 1 is unwound, the length in the MD direction of the outermost 10 sheets (hereinafter simply referred to as the "perforation pitch <outermost roll>") is defined as P2, and P2 is preferably 1754 mm or more and 1822 mm or less. If P2 is less than 1754 mm, the area per sheet becomes small, the water absorbency becomes poor, and it is difficult to use. If P2 exceeds 1822 mm, the area per sheet becomes large, the amount used increases, and it is difficult to use. The lower limit of P2 is more preferably 1771 mm or more, and even more preferably 1786 mm or more. The upper limit of P2 is more preferably 1811 mm or less, and even more preferably 1798 mm or less.

[0069] P1 and P2 are measured as follows. (1) Prepare roll 1, remove the sheet with tail seal glue from the outermost edge 1e of the roll shown in Figure 1, then pull out 10 sheets from there and cut kitchen towel 1x at perforation 1c of the 10th sheet. These 10 outermost sheets will be called "Sheet B." (2) Next, unwind Roll 1 to the end. Then, remove the innermost sheet wrapped around Core 1d, and count 10 sheets from there. Cut Kitchen Towel 1x at perforation 1c on the 10th sheet. These innermost 10 sheets will be called "Sheet A." (3) Measure the MD length of the cut Sheet A and Sheet B using the following method: Fix one end of the longitudinal direction of Sheet A and Sheet B above a vertical wall, and while the longitudinal direction is facing up and down, place the other end of Sheet A and Sheet B along the wall so that it hangs down under its own weight, but measure with a tape measure in a state where it is not fixed and no tension is applied. (4) Repeat the measurements (1) to (3) above for three rolls 1, and define the average length in the MD direction of Sheet A (innermost roll) as P1, and the average length in the MD direction of Sheet B (outermost roll) as P2. If P1 or P2 exceeds 2000 mm, the length of five sheets may be measured and proportionally converted to 10 sheets.

[0070] (pitch ratio) The pitch ratio of P1 to P2 (P1 / P2) is 0.960 or more and 1.033 or less. If the pitch ratio is less than 0.950 or exceeds 1.033, the difference in quality between the inner winding and the outer winding becomes large. Specifically, if the pitch ratio is less than 0.950, the winding strength of the outer winding is too strong compared to the inner winding, and the quality of the outer winding is inferior to that of the inner winding. On the other hand, if the pitch ratio exceeds 1.033, the winding strength of the inner winding is too strong compared to the outer winding, and the quality of the inner winding is inferior to that of the outer winding. The lower limit of the pitch ratio is preferably 0.970 or more, more preferably 0.981 or more. The upper limit is preferably 1.022 or less, more preferably 1.002 or less.

[0071] In the present invention, we have found that controlling the pitch ratio (P1 / P2) can reduce the difference in quality between the outer and inner rolls of roll 1. Specifically, the inner roll, which is more easily compressed, is wrapped loosely to prevent the kitchen towel 1x from being crushed, while the outer roll, which is less likely to be compressed, is wrapped tightly with the kitchen towel 1x taut, thereby reducing the difference in texture between the inner and outer rolls. Therefore, we have found that the pitch of the perforations 1c (the distance between perforations 1c in the MD) made at approximately equal intervals in the kitchen towel 1x can be used as an indicator of the strength of the roll winding, and that the quality difference can be controlled by changing the pitch ratio (P1 / P2).

[0072] (Sheet area <innermost roll>) When roll 1 is unwound, the area of ​​one sheet of the innermost roll (hereinafter simply referred to as "sheet area <innermost roll>") is S1, and S1 is 280 cm 2 More than 600cm 2 S1 is preferably 280 cm or less. 2 If it is less than 600cm, it will be difficult to use due to poor absorbency. 2 If it exceeds this limit, the amount of use increases and it becomes difficult to use. The lower limit of S1 is 350 cm 2 More than 400cm is preferable. 2 More preferably, the upper limit of S1 is 560 cm 2 Less than 520cm is preferable 2 The following is even more preferred:

[0073] (Sheet area <Outermost roll>) When roll 1 is unwound, the area of ​​one sheet of the outermost roll (hereinafter simply referred to as "sheet area <outermost roll>") is S2, and S2 is 280 cm 2 More than 600cm 2 S2 is preferably 280 cm or less. 2 If it is less than 600cm, it will be difficult to use due to poor absorbency. 2 If it exceeds this limit, the amount of use increases and it becomes difficult to use. The lower limit of S2 is 350 cm 2 More than 410cm is preferable. 2 More preferably, the upper limit of S2 is 560 cm 2 Less than 530cm is preferable 2 The following is even more preferred:

[0074] S1 and S2 are measured as follows. (1) Prepare Sheet A for the P1 measurement above, and divide the MD length of Sheet A (10 sheets) by 10 to calculate the length of one sheet. Measure the CD length (W) with a ruler and calculate the product. (2) Next, prepare Sheet B for the P2 measurement above, divide the MD length of Sheet B (10 sheets) by 10 to calculate the length of one sheet, measure the CD length (W) with a ruler, and calculate the product. (3) Repeat the measurements (1) and (2) above for Sheet A and Sheet B for the three rolls used to measure P1 and P2, and define the average areas as S1 and S2.

[0075] (S1 / water absorption amount <unit area>) The ratio of the sheet area (innermost roll) to the water absorption per unit area (hereinafter also referred to as "S1 / water absorption <unit area>") is preferably 0.72 or more and 1.77 or less. If this ratio is less than 0.72, the roll 1 tends to become bulky, the roll diameter increases, and it becomes difficult to attach to a paper holder. If this ratio exceeds 1.77, the water absorption of the kitchen towel 1x becomes poor. The lower limit of this ratio is more preferably 0.85 or more, and even more preferably 0.92 or more. The upper limit is preferably 1.35 or less, and even more preferably 1.18 or less.

[0076] (S2 / water absorption amount <unit area>) The ratio of the sheet area (outermost roll) to the water absorption per unit area (hereinafter also referred to as "S2 / water absorption <unit area>") is preferably 0.72 or more and 1.77 or less. If this ratio is less than 0.72, the roll 1 tends to become bulky, the roll diameter increases, and it becomes difficult to attach to a paper holder. If this ratio exceeds 1.77, the water absorption of the kitchen towel 1x becomes poor. The lower limit of this ratio is more preferably 0.85 or more, and even more preferably 0.93 or more. The upper limit is preferably 1.35 or less, and even more preferably 1.20 or less.

[0077] (DMDT) The dry machine direction tensile strength (DMDT) of the kitchen towel 1x during drying according to JIS P 8113 is preferably 1500 cN / 76 mm or more and 5000 cN / 76 mm or less. If the tensile strength DMDT of the kitchen towel 1x is lower than 1500 cN / 76 mm, the strength is too weak, making it difficult to control the paper tension, resulting in quality differences between outer and inner wrapping. On the other hand, if the tensile strength DMDT of the kitchen towel 1x is higher than 5000 cN / 76 mm, the softness will be inferior. The lower limit of the above range of the tensile strength DMDT of the kitchen towel 1x is more preferably 2000 cN / 76 mm or more, and even more preferably 2500 cN / 76 mm or more. Furthermore, the upper limit of the above range of the tensile strength DMDT of the kitchen towel 1x is more preferably 4300 cN / 76 mm or less, and even more preferably 3500 cN / 76 mm or less.

[0078] (DCDT) The dry cross-direction tensile strength (DCDT) of the kitchen towel 1x in the dry state according to JIS P 8113 is preferably 1400 cN / 76 mm or more and 4800 cN / 76 mm or less. If the tensile strength (DCDT) of the kitchen towel 1x is lower than 1400 cN / 76 mm, the strength is too weak, making it difficult to control the paper tension, resulting in quality differences between outer and inner wrapping. On the other hand, if the tensile strength (DCDT) of the kitchen towel 1x is higher than 4800 cN / 76 mm, the softness will be inferior. The lower limit of the above range of the tensile strength (DCDT) of the kitchen towel 1x is more preferably 1900 cN / 76 mm or more, and even more preferably 2400 cN / 76 mm or more. The upper limit of the above range of the tensile strength (DCDT) of the kitchen towel 1x is more preferably 4100 cN / 76 mm or less, and even more preferably 3300 cN / 76 mm or less.

[0079] The tensile strength DMDT and tensile strength DCDT of one kitchen towel are measured in accordance with JIS P 8113 with the number of plies of the product as is (two plies for two-ply, three plies for three-ply).

[0080] <Package> As shown in Figure 7, the packaging body 50 is made by caramel-wrapping three rolls 1 in a resin film 51 so that both axial (X-direction) end faces of the rolls 1 face the top and bottom surfaces of the packaging body 50, respectively.

[0081] (Number of rolls) The number of rolls 1 packed in the package 50 is preferably two or three, and more preferably three. If there are fewer than two rolls, the amount of resin film 51 used will be greater than the number of rolls, increasing the cost of the resin film 51. If there are more than three rolls, the package cannot be packed compactly.

[0082] <Resin film> The resin film (hereinafter also simply referred to as "film") 51 used in the packaging body 50 may be formed of a single layer or multiple layers. The material of the film 51 is preferably a thermoplastic resin suitable for recycling. Specific examples include thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.), polyester (PET, etc.), polyamide (nylon, etc.), polycarbonate, polystyrene, and polyvinyl chloride. Among these, polyethylene film is preferred from the viewpoint of fully exerting the effects of this embodiment.

[0083] (Packaging form) The wrapping body 50 may be, for example, wrapped in a caramel-like manner with the rolls 1 arranged in parallel with their axial directions parallel to each other and wrapped in a resin film 51. Caramel wrapping is well known.

[0084] For example, three rolls 1 are placed on a sheet-like film 51 so that their axial directions are parallel to one another, and in this state, the film 51 is wrapped around the circumferential surface of the roll 1 to form a cylinder. Then, the portions where both ends of the film 51 overlap with the circumferential surface of the roll 1 are heat-sealed (not shown) along the axial direction (X direction).

[0085] Alternatively, three rolls 1 arranged so that their axial directions are parallel to one another are raised from below the set sheet-like film 51 to the sheet surface (lower surface side) of the film 51. In this state, the film 51 is wound around the circumferential surface of the roll 1 to form a cylindrical shape, and the portions where both ends of the film 51 overlap with the circumferential surface of the roll 1 are heat-sealed (not shown) along the axial direction (X direction).

[0086] Alternatively, three rolls 1 arranged so that their axial directions are parallel to each other are inserted in the axial direction (X direction) from one end of the opening of a film 51 that has been formed into a cylindrical shape in advance.

[0087] Thereafter, of the film 51 protruding from both ends of the three rolls 1, two opposing flap-shaped sides are folded toward each other, and then another two opposing flap-shaped sides are similarly folded toward each other, and these folded portions are sealed by heat sealing or the like. The area sealed by this heat sealing is the heat-sealed adhesive portion 52 shown by hatching in Figure 7.

[0088] (Perforation on packaging) As shown in Fig. 7, the packaging body 50 may have perforations 53 for removing the roll 1. The position of the perforations 53 may be formed along the axial direction of the roll 1 as shown in Fig. 7, or along the outer periphery of the roll 1, but it is preferable not to form any perforations.

[0089] (Kitchen towel and roll product manufacturing method) The kitchen towel 1x and roll 1 according to this embodiment can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing and bonding, and (3) roll winding. Note that TAD papermaking technology is preferably used in the manufacturing (papermaking) process of the kitchen towel 1x.

[0090] In the papermaking process (1), it is preferable that the kitchen towel 1x is provided with an uneven pattern 11 derived from the papermaking process (fabric), which is different from the above-mentioned embossed pattern 12. By having this uneven pattern 11, the water absorption capacity of the kitchen towel 1x can be further increased.

[0091] "Derived from the papermaking process" means that the uneven pattern 11 is imparted between the head box 41 of the papermaking machine and the outlet of the Yankee dryer 46 during the papermaking process of the kitchen towel 1x. Specifically, in a portion of the papermaking process shown in FIG. 6, pulp slurry 40a is sprayed (supplied) from the head box 41 between the first fabric (forming fabric) 42 and the second fabric (uneven fabric) 43, and is drawn onto the second fabric (uneven fabric) 43 by the forming roll 44, forming a wet paper 40b. Next, the wet paper 40b is dried together with the second fabric (uneven fabric) 43 in a through-air dryer 45, resulting in the formation of unevenness in the dried sheet 40c. Note that while FIG. 6 shows two through-air dryers 45, a single unit may be used. Also, although a Yankee hood is depicted on the Yankee dryer 46, the hood may be omitted. Crepe may be imparted in the Yankee dryer 46.

[0092] Although the present invention has been described above based on the above embodiment, the present invention is not limited to the content of the above embodiment and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Example]

[0093] The present embodiment will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0094] (Examples 1 to 11, Comparative Examples 1 to 4) For Examples 1 to 11 and Comparative Examples 1 to 4, kitchen towel rolls were produced using the above-mentioned manufacturing method under the conditions shown in Tables 1 and 2. Then, the following four evaluations were carried out for each kitchen towel roll.

[0095] The "water absorbency" was evaluated by measuring the amount of water absorbed (product ply, per unit area) and rating it on a four-point scale. The evaluation criteria are as follows: ◎: 430g / m 2 That was all ○:390g / m 2 More than 430g / m 2 was less than △:300g / m 2 More than 390g / m 2 was less than ×:300g / m 2 It was less than.

[0096] 2. Seat softness The softness of the manufactured kitchen towels was evaluated by a panel of 20 people. Each panelist removed three wraps of kitchen towels from the kitchen towel roll, cut one sheet from the fourth wrap, and evaluated the sheet by selecting "soft" or "hard," and rated it according to the following criteria. ◎: 18 or more people said "The seat is soft" ○: 15 to 17 people said "The seat is soft" △: "The seat is soft" - 12 to 14 people ×: "The seat is soft" - 0 to 11 people

[0097] 3.Easy to attach to paper holder A sensory evaluation was conducted by 20 panelists on the "ease of attaching" kitchen towel rolls to paper holders after manufacturing. Each panelist attached a kitchen towel roll to a paper holder set on the side of a shelf and selected "easy to attach" or "difficult to attach," and rated the rolls according to the following criteria: ◎: More than 18 people said it was "easy to wear" ○: "Easy to wear": 15 to 17 people △: "Easy to wear": 12 to 14 people ×: "Easy to wear": 0 to 11 people

[0098] 4. Quality difference between the innermost and outermost windings A sensory evaluation was conducted by 20 panelists to assess the quality difference between the innermost and outermost rolls of manufactured kitchen towel rolls. Each panelist actually used the innermost and outermost rolls for their usual purposes and compared their comfort in use. The survey was conducted by selecting either "There is no difference in quality between the innermost and outermost rolls" or "There is a difference in quality between the innermost and outermost rolls," and the results were evaluated according to the following criteria. ◎: "There is no difference in quality between the innermost and outermost rolls" - 18 or more people ○: "There is no difference in quality between the innermost and outermost rolls" - 15 to 17 people △: "There is no difference in quality between the innermost and outermost rolls" - 12 to 14 people ×: "There is no difference in quality between the innermost and outermost rolls" - 0 to 11 people

[0099] The results obtained are shown in Tables 1 and 2.

[0100] [Table 1]

[0101] [Table 2]

[0102] As is clear from the results shown in Tables 1 and 2, the kitchen towel rolls of Examples 1 to 10 were all excellent in absorbency per sheet, softness, ease of attachment to a paper holder, and quality difference between the innermost and outermost rolls. In contrast, the kitchen towel rolls of Comparative Examples 1 to 4 were inferior in any of absorbency per sheet, softness, ease of attachment to a paper holder, and quality difference between the innermost and outermost rolls.

[0103] From the above, it has been confirmed that, according to the present disclosure, even long kitchen towel rolls are soft, easy to attach to paper holders, and have little difference in quality between the inner and outer wrapping of the roll, and have good water absorbency. [Explanation of symbols]

[0104] 1: Kitchen towel roll (roll) 1c: Perforation 1d: Core 1e: The outermost edge of the kitchen towel roll 1x: Kitchen towel 10: Sheet 11: Concave and convex pattern derived from the papermaking process 12: Embossed pattern 12a: Linear embossing 15a: (perforation) cut section 15b: (Perforation) Joint 20: Test piece 21: Holder 40a: Pulp slurry 40b: Wet paper 40c: dry sheet 41: Head box 42: First fabric (forming fabric) 43: Second fabric (textured fabric) 44: Forming roll 45:Through air dryer 46: Yankee Dryer 50: Packaging 51: Resin film 52: Heat seal adhesive part 53: Perforation

Claims

1. A kitchen towel roll wound into a roll shape, the kitchen towel having perforations along the width direction and the entire length for cutting into a single sheet, The kitchen towel has a paper thickness of 2.29 mm or more and 4.25 mm or less per 10 plies, and a water absorption capacity per unit area of ​​300 g / m ２ More than 700g / m ２ is as follows: When the kitchen towel roll is unwound, the pitch of the perforations for the innermost 10 sheets is P1, and the pitch of the perforations for the outermost 10 sheets is P2. The pitch ratio (P1 / P2) is 0.960 or more and 1.033 or less. The winding length is 18m or more and 45m or less. A kitchen towel roll.

2. 2. The kitchen towel roll according to claim 1, wherein the roll diameter is 130 mm or more and 170 mm or less.

3. The basis weight of the product ply of the kitchen towel is 30 g / m ２ More than 59g / m ２ 3. The kitchen towel roll according to claim 1, wherein:

4. The specific volume of the kitchen towel is 7.7 g / cm ３ 24.5g / cm or more ３ 3. The kitchen towel roll according to claim 1, wherein:

5. 3. The kitchen towel roll according to claim 1, wherein the water absorption per unit mass of the kitchen towel is 5.0 g / g or more and 20.0 g / g or less.

6. 3. The kitchen towel roll according to claim 1, wherein the kitchen towel is wound around a core, and the roll mass per 280 mm of roll width excluding the core is 170 g or more and 550 g or less.

7. Winding density: 0.20 m / cm ２ 0.56m / cm or more ２ 3. The kitchen towel roll according to claim 1, wherein:

8. Roll density is 0.045 g / cm ３ 0.120g / cm or more ３ 3. The kitchen towel roll according to claim 1, wherein:

9. When the kitchen towel roll is unwound, the area of ​​the innermost sheet is 280 cm ２ More than 600cm ２ 3. The kitchen towel roll according to claim 1, wherein:

10. When the kitchen towel roll is unwound, the area of ​​the outermost sheet is 280 cm ２ More than 600cm ２ 3. The kitchen towel roll according to claim 1, wherein:

11. 3. The kitchen towel roll according to claim 1, wherein the ratio of the area of ​​one sheet of the innermost roll to the amount of water absorption per unit area is 0.72 or more and 1.77 or less.

12. 3. The kitchen towel roll according to claim 1, wherein the ratio of the area of ​​one sheet of the outermost roll to the amount of water absorption per unit area is 0.72 or more and 1.77 or less.

13. 3. The kitchen towel roll according to claim 1, wherein the kitchen towel has a linear embossed pattern.

14. 3. The kitchen towel roll according to claim 1, wherein P1 is 1,750 mm or more and 1,815 mm or less, and P2 is 1,754 mm or more and 1,822 mm or less.

15. A package containing two or three kitchen towel rolls according to claim 1 or 2.

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