Kitchen towel roll

Abstract

To provide a kitchen towel roll keeping soft feeling, having excellent water absorption amount, and having difficulty in ply peeling while maintaining a basis weight of a sheet and an application quantity of a ply bond glue.SOLUTION: Disclosed is a kitchen towel roll obtained by adhesion treatment of a sheet given an embossment pattern at least for 1 ply by using a ply bond glue to give a 2 ply-laminated kitchen towel sheet, followed by winding up to a roll shape. The kitchen towel roll is characterized by that the 1-ply kitchen towel sheet has a basis weight of 16 g / m2 or over and 26 g / m2 or under and a peel strength of 0.04 N / 100 m or over and 0.22 N / 100 mm or under and the 2-ply kitchen towel sheet has a water absorption amount per a unit area of 340 g / m2 or over and 600 g / m2 or under and a water absorption amount per a unit weight of 7 g or over and 13 g or under.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] In recent years, various kitchen towel sheets and kitchen towel rolls made by rolling up sheets have been developed and sold.

[0003] Strength and a firm feel when using are important factors for kitchen towels, and papermaking techniques have been developed to increase the strength of regular base paper to give the towels a firm feel.

[0004] On the other hand, the so-called Through Air Drying (TAD) papermaking technology, which uses air drying, produces base paper that is highly absorbent and has a soft feel, making it excellent for use as base paper for kitchen towel rolls.

[0005] The base paper for ordinary kitchen towel rolls is designed to apply as little adhesive (ply bond glue, hereafter simply referred to as "glue") that bonds the plies together as possible, so as not to affect the texture or cost. If the amount of ply bond glue applied is small, the plies will peel off easily, but on the other hand, if the amount applied is large, it will increase costs and will also be inferior in feel (fluffiness).

[0006] As a prior art document related to kitchen towel rolls, for example, Patent Document 1 describes a kitchen towel roll in which a sheet with an embossed pattern is glued with glue, laminated into two plies, and the resulting kitchen towel sheet is wound into a roll. The kitchen towel sheet has an uneven pattern derived from the papermaking process that is different from the embossed pattern, and the basis weight of the two plies is 30 g / m. 2 More than 54g / m 2 The following is a 1m2 sheet of 2 ply paper with a thickness of 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less: 2The present invention discloses a kitchen towel roll having a water absorption per roll of 220 g to 600 g, a roll length of 14 m to 44 m, and a roll diameter of 110 mm to 189 mm. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2022-116768 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, as mentioned above, if the amount of ply bond glue applied is small, ply peeling is more likely to occur, but conversely, if the amount applied is large, it can lead to increased costs, the sheet can become hard, the feel of use can be poor, and the water absorbency can also be poor.

[0009] In order to prevent the ply from peeling off, it is possible to increase the amount of ply bond glue applied and increase the basis weight of the sheet to prevent a decrease in water absorbency, but these measures in turn result in increased costs. In particular, in the case of TAD papermaking, because it uses a textured fabric, if the amount of plybond glue applied is small, the ply peeling is more likely to occur than with normal products. However, if the amount of plybond glue applied is large, not only will the cost increase, but the sheet will become hard and will lose the soft feel that comes with TAD papermaking.

[0010] Until now, the embossed area has been reduced and the concentration of ply bond glue has been increased to prevent ply peeling while maintaining a soft feel. However, if the concentration of the ply bond glue is high, not only does it increase costs, but it also requires a lot of work to clean the embossing roll.

[0011] The present invention has been made in consideration of the above circumstances, and aims to provide a kitchen towel roll that maintains the basis weight of the sheet and the amount of ply bond glue applied, while retaining a soft texture, having excellent water absorption, and being resistant to ply peeling. [Means for solving the problem]

[0012] The inventors have conducted extensive research and found that, in a kitchen towel roll formed by laminating two plies of a sheet having an embossed pattern on at least one ply and bonding the two plies with ply bond glue, the kitchen towel roll can be wound into a roll shape with the basis weight and peel strength of one ply of the kitchen towel sheet, and the water absorption per unit area and water absorption per unit weight of the two plies each within a predetermined range, thereby making it possible to obtain a kitchen towel roll that maintains the basis weight of the sheet and the amount of ply bond glue applied, has a soft texture, is excellent in water absorption, and is less likely to peel off the plies, thereby solving the above problems and completing the present invention. That is, the present invention provides the following.

[0013] (1) The first aspect of the present invention is a kitchen towel roll in which a sheet having an embossed pattern on at least one ply is bonded with a ply bond glue, the laminate is laminated into two plies, and the resulting kitchen towel sheet is wound into a roll, and the basis weight of one ply of the kitchen towel sheet is 16 g / m 2 More than 26g / m 2 The peel strength is 0.04 N / 100 m or more and 0.22 N / 100 mm or less, and the water absorption per unit area of ​​two plies of the kitchen towel sheet is 340 g / m 2 More than 600g / m 2 The kitchen towel roll is characterized in that the water absorption per unit weight is 7 g or more and 13 g or less.

[0014] (2) A second aspect of the present invention is the kitchen towel roll described in (1), characterized in that the paper thickness of the kitchen towel sheet is 1.3 mm / 10 plies or more and 5.0 mm / 10 plies or less.

[0015] (3) The third aspect of the present invention is the kitchen towel roll according to (1), wherein the specific volume of the kitchen towel sheet is 7.6 cm 3 / g or more 19.2cm 3 / g or less.

[0016] (4) A fourth aspect of the present invention is the kitchen towel roll described in (1), characterized in that the kitchen towel sheet has an uneven pattern resulting from the papermaking process that is different from the embossed pattern.

[0017] (5) A fifth aspect of the present invention is the kitchen towel roll according to (1), including one in which the embossing pattern is linear, characterized in that the area of ​​the linear embossing pattern occupied by embossments having a thickness of 0.1 mm to 4 mm and a length of 5 mm or more is 5% to 40% of the sheet area of ​​the kitchen towel sheet.

[0018] (6) A sixth aspect of the present invention is the kitchen towel roll described in (1), characterized in that the ply bond glue is a polyvinyl alcohol-based adhesive having a pH of 5 or more and 8 or less at 25°C and containing a synthetic resin.

[0019] (7) A seventh aspect of the present invention is the kitchen towel roll described in (1), characterized in that the viscosity of the ply bond glue at 30°C is 20 mPa·s or more and 75 mPa·s or less.

[0020] (8) An eighth aspect of the present invention is the kitchen towel roll described in (1), characterized in that the non-volatile content of the ply bond glue is 2% or more and 13% or less.

[0021] (9) A ninth aspect of the present invention is the kitchen towel roll according to (1), wherein the amount of the ply bond glue applied is 0.5 g / m 2 More than 7.5g / m 2 It is characterized in that: Effect of the Invention

[0022] According to the present invention, it is possible to provide a kitchen towel roll that maintains the basis weight of the sheet and the amount of ply bond glue applied, while retaining a soft feel, has excellent water absorption, and is resistant to ply peeling. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the present invention. [Diagram 3] FIG. 2 is a diagram showing an example of an embossing pattern in the kitchen towel roll of the present invention. [Figure 4] FIG. 2 is a diagram showing a part of the papermaking process for the kitchen towel sheet of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment for carrying out the present invention (hereinafter, simply referred to as "the present embodiment") will be described in detail. The present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0025] In addition, the MD direction of the kitchen towel sheet is the flow direction (machine direction) when the kitchen towel sheet is made, and the CD direction is the direction perpendicular to the MD direction (cross direction).

[0026] <Kitchen towel roll> Fig. 1 is a perspective view of a kitchen towel roll 1 according to one embodiment of the present invention. As shown in Fig. 1, the kitchen towel roll 1 according to this embodiment is a kitchen towel sheet 1x in which at least one ply of a sheet having an embossed pattern is glued with glue and laminated into two plies, and the resulting kitchen towel sheet 1x is wound into a roll. Note that the kitchen towel sheet 1x is preferably perforated in the roll width direction at approximately equal intervals in the rolling direction (not shown). As shown in Fig. 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). Also, the edge of kitchen towel sheet 1x is referred to as outermost edge 1e of kitchen towel roll 1.

[0027] Uses of the kitchen towel roll 1 include, for example, rolls (kitchen paper rolls) of kitchen paper (sometimes called paper towels, cooking paper, etc.) used in home kitchens, restaurant kitchens, etc. for wiping off moisture or oil and removing dirt, as well as other rolls of sanitary paper.

[0028] (Roll length and diameter) The lower limit of the winding length of the kitchen towel roll 1 is preferably 10 m or more, more preferably 20 m or more, and even more preferably 25 m or more. The upper limit is preferably 50 m or less, more preferably 40 m or less, and even more preferably 35 m or less. By keeping the winding length within the above numerical range, the winding diameter DR, which will be described later, can be kept within an appropriate range.

[0029] The roll length is measured as follows. First, the length of 10 sheets of kitchen towel sheets 1x between the perforations of kitchen towel roll 1 is measured. After that, 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, then the roll length is 1.80 m x (150 / 10) = 27 m. Note that if kitchen towel roll 1 does not have perforations, the roll length is measured.

[0030] The winding diameter DR of the kitchen towel roll 1 according to this embodiment is preferably 85 mm or more and 180 mm or less. By having the winding diameter DR within the above numerical range, the kitchen towel roll 1 can maintain a soft texture, have excellent water absorption, and is less susceptible to ply peeling. The winding diameter DR is more preferably 100 mm or more and 170 mm or less, and even more preferably 130 mm or more and 160 mm or less.

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

[0032] (Roll width and roll weight) The roll width of the kitchen towel roll 1 is preferably at least 200 mm, more preferably at least 220 mm, and even more preferably at least 240 mm. The upper limit is preferably at most 320 mm, more preferably at most 300 mm, and even more preferably at most 285 mm. By keeping the roll width within the above numerical range, the kitchen towel roll 1 can be made to maintain the grammage, peel strength, and water absorption amount described below within a certain range.

[0033] The lower limit of the roll weight of the kitchen towel roll 1 is preferably 95 g or more, more preferably 180 g or more, and even more preferably 310 g or more. The upper limit is preferably 470 g or less, more preferably 430 g or less, and even more preferably 370 g or less. By keeping the roll weight within the above numerical range, the kitchen towel roll 1 can be made to maintain the basis weight, peel strength, and water absorption amount described below within a certain range.

[0034] The roll weight is the weight per 280 mm of roll width, not including the core, for kitchen towel roll 1. If the roll width is not 280 mm, it is converted proportionally to the weight per 280 mm.

[0035] (Roll density) The roll density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.04 g / cm 3 It is preferable that the concentration is 0.05 g / cm or more. 3 More preferably, it is 0.06 g / cm or more. 3 More preferably, the upper limit is 0.15 g / cm. 3 It is preferable that the concentration is 0.13 g / cm or less. 3 More preferably, it is 0.08 g / cm or less. 3 By having the roll density within the above range, the kitchen towel roll 1 can maintain a soft feel, has excellent water absorption, and is resistant to ply peeling.

[0036] Roll density is expressed as (roll weight) ÷ (roll volume). Roll weight is the weight of kitchen towel roll 1 per 280 mm of roll width. Roll volume is expressed as [{cross-sectional area of ​​roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​core outer diameter DI)] × roll width (converted per 280 mm). For example, if the roll weight (excluding core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the core outer diameter DI is 39 mm, roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10)2 -3.14×(39mm÷2÷10) 2}×(280mm÷10)]=0.08g / cm 3 It becomes.

[0037] (winding density) The winding density of the kitchen towel roll 1 according to this embodiment has a lower limit of 0.22 m / cm 2 It is preferable that the thickness is 0.25 m / cm or more. 2 More preferably, it is 0.28 m / cm or more. 2 More preferably, the upper limit is 0.68 m / cm. 2 Preferably, it is 0.54 m / cm or less. 2 More preferably, it is 0.40 m / cm or less. 2 By having the winding density of the kitchen towel roll 1 within the above range, the kitchen towel roll 1 can maintain a soft feel, have excellent water absorption, and be resistant to ply peeling.

[0038] The winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll's outer diameter (winding diameter DR) part - (cross-sectional area of ​​the core outer diameter DI part)}. For example, in the case of a winding length of 27 m, 2 plies, winding diameter DR of 150 mm, and core outer diameter DI of 39 mm, the winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}=0.33m / cm 2 It becomes.

[0039] (Core outer diameter) The core outer diameter DI, which is the outer diameter of the core of the kitchen towel roll 1 of the present invention, has a lower limit of preferably 35 mm or more, more preferably 38 mm or more, and even more preferably 42 mm or more. The upper limit is preferably 50 mm or less, more preferably 48 mm or less, and even more preferably 46 mm or less. By having the core outer diameter DI within the above numerical range, the kitchen towel roll 1 can maintain a soft texture, have excellent water absorption, and be resistant to ply peeling.

[0040] The core outer diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Six kitchen towel rolls 1 are measured and the measurement results are averaged. If the core does not have a core (paper tube), the outer diameter of the hollow core portion is measured. The paper used for the core preferably contains 40% or more, more preferably 60% or more, and even more preferably 80% or more of BKP (bleached pulp). By keeping the BKP content within the above range, the strength of the core becomes appropriate, and the softness of the sheet can be maintained when the sheet is wound around the core.

[0041] <Kitchen towel sheet> (Basic weight) The basis weight of one ply of the kitchen towel sheet 1x according to this embodiment is 16 g / m 2 More than 26g / m 2 The basis weight of one ply is 16 g / m 2 If the grammage of one ply is less than 26 g / m, the kitchen towel sheet 1x will have poor water absorbency. 2 If it exceeds this, the manufacturing cost will be high. The basis weight of the kitchen towel sheet 1x can be measured according to JIS P 8124. The basis weight of one ply of the kitchen towel sheet 1x is 18 g / m 2 More than 24g / m 2 It is preferable that the thickness is less than 20 g / m 2 More than 22g / m 2 It is more preferable that:

[0042] (paper thickness) The paper thickness of the kitchen towel sheet 1x is preferably 1.3 mm / 10 ply or more and 5.0 mm / 10 ply or less. If the paper thickness is less than 1.3 mm / 10 ply, the kitchen towel sheet 1x will have poor water absorbency and softness. If the paper thickness is more than 5.0 mm / 10 ply, the manufacturing cost will be high. The thickness of the paper can be measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement conditions are a measurement load of 37.85 gf / cm2, a gauge diameter of 30 mm, a sample is placed between the gauge and the measuring table, and the gauge is read when the gauge is lowered at a speed of 1 mm or less per second. The sample is a kitchen towel sheet 1x of 10 plies (5 sets of 2 plies). The measurement is repeated 10 times at different points, and the measurement results are averaged. The thickness of the kitchen towel sheet 1x is preferably 2.2 mm / 10 plies or more and 4.0 mm / 10 plies or less, and more preferably 2.6 mm / 10 plies or more and 3.6 mm / 10 plies or less.

[0043] (specific volume) The specific volume of one kitchen towel sheet is 7.6 cm 3 / g or more 19.2cm 3 / g or less. The specific volume of one kitchen towel sheet is preferably 7.6 cm 3 If the specific volume of the kitchen towel sheet 1x is less than 19.2 cm3 / g, the softness of the kitchen towel sheet 1x will be inferior. 3 If the strength exceeds 1 / g, the kitchen towel sheet 1x will be prone to ply peeling. The specific volume of one kitchen towel sheet is 10.0 cm 3 / g or more 17.6cm 3 / g or less is more preferable, and 12.5 cm 3 / g or more 16.5cm 3 The specific volume is calculated by dividing the paper thickness per ply of the kitchen towel sheet 1x by the basis weight per ply, and finding the volume (cm) per unit (g). 3 )

[0044] (DMDT, DCDT and GMT) The kitchen towel sheet 1x preferably has a dry machine direction tensile strength (DMDT) according to JIS P 8113 of 5.8 N / 25 mm or more and 14.7 N / 25 mm or less. Furthermore, the dry cross direction tensile strength DCDT (Dry Cross Direction Tensile Strength) of the kitchen towel sheet 1x according to JIS P 8113 is preferably 5.8 N / 25 mm or more and 14.7 N / 25 mm or less.

[0045] Furthermore, the GMT, which is the square root of the product of DMDT and DCDT, is preferably 5.8 N / 25 mm or more and 14.7 N / 25 mm or less. If the DMDT, DCDT or GMT is less than 5.8N / 25mm, the resulting kitchen towel sheet 1x will have poor water absorption. If the DMDT, DCDT or GMT is more than 14.7N / 25mm, the sheet will become hard and will feel poor in use.

[0046] The DMDT is more preferably 7.1 N / 25 mm or more and 13.5 N / 25 mm or less, and even more preferably 7.8 N / 25 mm or more and 11.8 N / 25 mm or less. The DCDT is more preferably 7.1 N / 25 mm or more and 13.5 N / 25 mm or less, and even more preferably 7.8 N / 25 mm or more and 11.8 N / 25 mm or less. Furthermore, the GMT is more preferably 7.1 N / 25 mm or more and 13.5 N / 25 mm or less, and further preferably 7.8 N / 25 mm or more and 11.8 N / 25 mm or less.

[0047] The DMDT and DCDT of the kitchen towel sheet 1x are measured in accordance with JIS P 8113, and the ratio (DMDT / DCDT) is calculated from the measured DMDT and DCDT. The GMT is calculated from the square root of the product of the measured DMDT and DCDT. Note that DMDT, DCDT, and GMT are all measured with the kitchen towel sheet 1x still in 2 ply form.

[0048] (peel strength) The peel strength of the kitchen towel sheet 1x is 0.04N / 100m or more and 0.22N / 100mm or less. If the peel strength of the kitchen towel sheet 1x is less than 0.04N / 100m, the ply of the kitchen towel sheet 1x is easily peeled off. If the peel strength of the kitchen towel sheet 1x is more than 0.22N / 100m, the kitchen towel sheet 1x becomes hard and has poor softness. The peel strength of the kitchen towel sheet 1x is preferably 0.07 N / 100 m or more and 0.16 N / 100 mm or less, and more preferably 0.11 N / 100 m or more and 0.16 N / 100 mm or less. The peel strength of the kitchen towel sheet 1x is measured as follows.

[0049] The peel strength is measured according to the tensile test method of JIS P 8113 using a tensile tester (STB-1225S, manufactured by A&D Co., Ltd.) under the standard conditions specified in JIS P 8111. First, three rectangular test pieces of 65mm x 100mm are taken from a sample of 1x kitchen towel sheet. At this time, three pieces are taken randomly so that the flow direction and width direction of the sheet are varied. Next, the ply is peeled off 15mm in the short side direction, and two acrylic sheets or the like are prepared and clamped between the upper and lower gripping tools. The size of the acrylic sheets does not matter as long as it is larger than the gripping tools, but if they are rectangular in shape, about 110mm x 85mm, it is easy to set the test pieces. Next, one side of the peeled ply is attached to the upper acrylic sheet with tape or the like and fixed. The other ply is also attached to the lower acrylic sheet with tape or the like and fixed. The pitch (spacing) of the acrylic sheets clamped in the gripping tools is 1mm so that the sheet can fit between the upper and lower gripping tools. Next, the sheet is pulled (peeled off) at a pulling speed of 100mm / min, and strength data is collected. The strength data is analyzed graphically to select the extreme point analysis range. The extreme point analysis range is selected so as to exclude about 10% of the values ​​before and after the measurement, and the data of about 80% in the middle is averaged to determine the peel strength (N / 100 mm).

[0050] (Water absorption) In the present invention, the water absorption per unit area of ​​the kitchen towel sheet 1x is 340 g / m 2 More than 600g / m 2 The water absorption per unit area is 340g / m 2 If the thickness is less than 600 g / m, the kitchen towel sheet 1x will have poor water absorption. 2 If the thickness exceeds this range, the basis weight of the kitchen towel sheet 1x will be high, resulting in high production costs. The water absorption capacity per unit area of ​​one kitchen towel sheet is 400g / m 2 More than 500g / m 2 It is preferable that the thickness is less than 420 g / m 2 More than 460g / m 2 It is more preferable that:

[0051] In addition, the water absorption per unit weight of the kitchen towel sheet 1x is preferably 7 g / g or more and 13 g / g or less. If the water absorption per unit weight is less than 7 g / g, the kitchen towel sheet 1x has poor water absorption. If the water absorption per unit weight is more than 13 g / g, the water absorption per sheet becomes more than necessary, and the ply is easily peeled off. The water absorption per unit weight is more preferably 8 g / g or more and 13 g / g or less, and further preferably 9 g / g or more and 13 g / g or less.

[0052] The method for measuring the water absorption amount of each of the kitchen towel sheets 1x will be described below with reference to FIG. First, a two-ply kitchen towel sheet 1x is taken and cut using a square template with each piece being 7.6 cm (3 inches) to prepare a rectangular test piece 10 with each side being 7.6 cm. The weight of the test piece 10 before water absorption is measured using an electronic balance. The test piece 10 is set in a holder 12 (a jig that fixes three points of the test piece, the jig being made of a metal that does not absorb water).

[0053] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 10 set on the holder 12 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 10 is removed from the distilled water together with the holder 12, and a strip 11 is attached to one corner 10d of the test piece 10 as shown in FIG. 2. The strip 11 is made by peeling off one ply of kitchen towel that is the same as the two plies of kitchen towel to be measured, cutting the one ply of paper kitchen towel into a size of 2 mm x 15 mm in length, and attaching it to a part of the test piece 10 6 mm from the corner 10d toward the center. Next, the holder 12 and the test piece 10 are hung from a rod installed in an empty water tank so that the corner 10a opposite the corner 10d is on top, and the lid of the water tank is closed and left for 15 minutes.

[0054] Thereafter, the holder 12 and the test piece 10 are taken out of the water tank, the band 11 and the holder 12 are removed, and the weight of the test piece 10 is measured using an electronic balance. From the change in weight of the test piece 10 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 10 (g water / m of sheet) is calculated. 2 , 1m2 Hit. Abbreviated as g / m 2 ) is calculated. In addition, the water absorption per unit area (g water / sheet m 2 ) by the basis weight of the product ply of the test piece 10 to obtain the water absorption per unit area (g water / sheet m 2 ) / grammage(sheet g / sheet m 2 ) = Water absorption per unit weight (g water / g sheet, per 1g. Abbreviated as g / g). Measurements are carried out five times for each sample, and the average value is used. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and a humidity of 50±2%. The distilled water is kept at 23±1°C.

[0055] (Embossed) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an embossed pattern. The kitchen towel sheet 1x of the present invention is made by embossing at least one ply of a two-ply sheet and then laminating it to make two plies. When laminating the two plies, a ply bond glue (adhesive) described later is used to apply glue and perform bonding treatment. By bonding the plies to make two plies in this way, the adhesion of the plies becomes strong, and the kitchen towel sheet 1x is less likely to tear without peeling off even when it gets wet with water. The embossing is preferably performed on one of the two plies of the sheet, and more preferably on the ply on the front surface 1a of the two plies of the sheet.

[0056] As described above, it is preferable that the ply on the surface 1a of the kitchen towel sheet 1x is embossed with a pattern. By providing the ply on the surface 1a with an embossed pattern, the embossed portion of the embossed pattern can be applied with glue for adhesion treatment, which makes it difficult for the ply of the kitchen towel sheet 1x to peel off and allows the water absorption to be within a certain range. The embossed pattern is not particularly limited as long as it is a pattern that is generally applied to kitchen towels, such as a dot pattern or a line pattern, but it is preferable to include a linear embossed pattern. Specifically, the linear embossed pattern is not particularly limited as long as it includes two types of figures, namely, a figure having a substantially circular shape and another pattern inside, and a figure that is substantially line-symmetrical in the vertical and horizontal directions as a whole and includes a combination of multiple curves and figures, as shown in Fig. 3. For the substantially circular shape, it is preferable that the substantially circular shape is doubled.

[0057] As for the dimensions of the embossed pattern, the rectangle E (E is not the embossed pattern) surrounding the embossed pattern is preferably a square with sides of 2 cm to 25 cm, more preferably a square with sides of 5 cm to 20 cm, and even more preferably a square with sides of 8 cm to 15 cm. The length direction of this rectangle E is preferably parallel to the flow direction of the kitchen towel roll 1, and the width direction is preferably parallel to the width direction of the kitchen towel roll 1, but may be inclined. By using such a pattern, in the kitchen towel sheet 1x having a high water absorption capacity as in the present application, the water absorption capacity can be improved, the ply is less likely to peel off, and strength can be maintained, resulting in a solid feel.

[0058] In this case, it is preferable that the area of ​​the embossments in the linear embossing pattern, which are 0.1 mm to 4 mm thick and 5 mm or longer, occupies 5% to 40% of the area of ​​the kitchen towel sheet 1x. If the ratio is less than 5%, the ply of the kitchen towel sheet 1x is easily peeled off. If the ratio exceeds 40%, the amount of ply bond glue applied increases, and the softness of the kitchen towel sheet 1x is inferior. The above area percentage is calculated by measuring the total length of all embossments that are 0.1 mm or more and 4 mm or less in thickness and 5 mm or more in length inside rectangle E which contains one embossing pattern as shown in Figure 3, and calculating the area of ​​the embossment as the total length (mm) x width (mm). When the area of ​​one sheet of kitchen towel sheet 1x is taken as (sheet length x sheet width of one sheet), the percentage is calculated as (embossment area / area of ​​one sheet of kitchen towel sheet 1x) x 100 (%).

[0059] The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. If an embossed pattern adjacent to an embossed pattern included in the rectangle that contains all the embossed patterns is included in the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length. If the size of one side of rectangle E cannot be clearly determined depending on the embossed pattern, the size of rectangle E is set to 10 x 10 cm, and the total length of the embossments included in rectangle E is measured. The total length is determined by actual measurement using a ruler, tape measure, etc., using the method described above. If the embossing is difficult to visually inspect, it may be measured using a general microscope. In addition, in the linear embossing pattern, the area occupied by embossments having a width of 0.1 mm or more and 4 mm or less and a length of 5 mm or more is more preferably 6% or more and 35% or less, and even more preferably 9% or more and 16% or less, of the area of ​​the kitchen towel sheet 1x.

[0060] In the embossing pattern, the embossing depth is preferably 0.06 mm or more and 1.05 mm or less. If the embossing depth is less than 0.06 mm, the ply bond glue is difficult to adhere and the ply is easily peeled off. If the depth exceeds 1.05 mm, too much ply bond glue adheres, resulting in poor sheet softness. This also causes an increase in costs. The depth of the embossing in the embossing pattern is more preferably 0.10 mm or more and 0.55 mm or less, and further preferably 0.14 mm or more and 0.35 mm or less.

[0061] The depth of the embossing is measured using a microscope. As the microscope, the product name "One Shot 3D Measurement Macroscope VR-3100" manufactured by KEYENCE Corporation can be used. As the observation, measurement, and image analysis software for the microscope image, the product name "VR-H1A" can be used. The measurement conditions and measurement method are described in detail, for example, in JP 2022-116768 A.

[0062] (Plybond Glue) The plybond glue used to bond the sheet having the embossed pattern is not particularly limited as long as it is an adhesive that is normally used for bonding paper products such as tissue paper, but it is preferable that the plybond glue is a polyvinyl alcohol-based adhesive that has a pH of 5 to 8 at 25° C. and contains a synthetic resin. Since the plybond glue is a polyvinyl alcohol-based adhesive that satisfies the above conditions, it has excellent adhesiveness and the amount of application can be reduced.

[0063] The viscosity of the plybond glue at 30° C. is preferably 20 mPa·s or more and 75 mPa·s or less. When the viscosity of the plybond glue is within the above range, the adhesiveness is excellent, and the amount of the glue applied to the kitchen towel sheet 1x can be reduced. The viscosity of the ply bond glue at 30°C is more preferably 30 mPa·s or more and 60 mPa·s or less, and even more preferably 35 mPa·s or more and 45 mPa·s or less. The viscosity of the ply bond glue at 30°C is measured using a general BH type viscometer.

[0064] In addition, the non-volatile content of the plybond glue is preferably 2% or more and 13% or less. When the non-volatile content of the plybond glue is within the above numerical range, the adhesiveness is excellent, and the amount of the glue applied to the kitchen towel sheet 1x can be reduced. The non-volatile content of the ply bond glue is more preferably 4% or more and 10% or less, and further preferably 5% or more and 7% or less.

[0065] Furthermore, the amount of plybond glue applied is 0.5 g / m 2 More than 7.5g / m 2 By applying the ply bond glue in an amount within the above range, it is possible to obtain a kitchen towel roll 1 that maintains a soft texture, has excellent water absorption, and is resistant to ply peeling without increasing costs. The amount of plybond glue applied is 0.5g / m 2 More than 3.5g / m 2 More preferably, it is 0.5 g / m or less. 2 More than 2.0g / m 2 The amount of plybond glue applied is calculated by dividing the area ratio of the embossment by 10.9. For example, when the area ratio of the embossment is 13%, the amount of plybond glue applied is calculated by dividing the area ratio of the embossment by 13%. 2 )

[0066] <Method of manufacturing kitchen towel roll packaging> The kitchen towel roll 1 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing and bonding, and (3) roll winding. In the manufacturing (papermaking) process of the kitchen towel sheet 1x, it is preferable to use TAD papermaking technology.

[0067] In this case, it is preferable that a concave-convex pattern derived from the papermaking process (fabric) different from the above-mentioned embossed pattern is applied to the kitchen towel sheet 1x in the papermaking process. By having this concave-convex pattern, the water absorption capacity of the kitchen towel sheet 1x can be further increased. Here, originating from the papermaking process means that in the papermaking process of kitchen towel sheet 1x, an uneven pattern is imparted between the head box of the papermaking machine and the outlet of Yankee dryer 22. Specifically, in a part of the papermaking process shown in Fig. 4, unevenness can be imparted in belt press section 20, which is arranged between dewatering roll 21 and Yankee dryer 22. In belt press section 20, wet paper 24 and uneven belt 23 (uneven belt 23 loops between belt press section 20 and Yankee dryer 22) are pressed together, thereby imparting an uneven pattern to wet paper 24.

[0068] The uneven pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the uneven pattern changes the specific volume (paper thickness), but it is preferable to select a pattern that brings the specific volume in the rolled state within the above-mentioned numerical range.

[0069] As described above, according to the present embodiment, it is possible to provide a kitchen towel roll that maintains the basis weight of the sheet and the amount of ply bond glue applied, while retaining a soft texture, having excellent water absorption, and being resistant to ply peeling.

[0070] Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. In addition, it is clear from the description of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention. EXAMPLES

[0071] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples shown below.

[0072] The kitchen towel rolls of Examples 1 to 15 and Comparative Examples 1 to 8 shown in Table 2 were manufactured through the steps of (1) papermaking and creping, (2) embossing and bonding, and (3) roll winding. The above-mentioned parameters were measured for all the kitchen towel roll packages of the Examples and Comparative Examples, and the following evaluations were performed. Note that the parameters other than those evaluated below were measured according to the above-mentioned standards or measurement methods. A polyvinyl alcohol-based adhesive was used as the ply bond glue.

[0073] 1. Cost (amount of glue used, basis weight of sheet) The amount of glue used (amount applied) in the manufactured kitchen towel sheet and the basis weight of one ply of the sheet were measured and evaluated on a four-level scale. The evaluation criteria are shown in Table 1 below. [Table 1]

[0074] 2. Softness The softness of the produced kitchen towel sheets when held in the hand was evaluated by 30 monitors, and the number of people who felt that the sheet was "hard" was rated on a 5-point scale. The evaluation criteria were as follows: ◎: 0-3 people felt the seat was too hard ○: 4-7 people felt the seat was too hard △: 8-10 people felt the seat was too hard ×: 11 or more people felt the seat was too hard

[0075] 3.Water absorption The amount of water absorbed per unit area of ​​the produced kitchen towel sheet was measured and rated on a four-level scale according to the following criteria: ◎: 420g / m 2 When the above ○: 400g / m 2 More than 420g / m 2 When less than △:340g / m 2 More than 400g / m2 When less than ×:240g / m 2 More than 340g / m 2 When less than ××:240g / m 2 When less than

[0076] 4. Ply peeling Thirty monitors performed a sensory evaluation of the resistance of the ply to peeling when using the manufactured kitchen towel sheet, and the number of people who felt that the ply was "easy to peel off" was rated on a 5-point scale. The evaluation criteria were as follows: ◎: 0-3 people felt that the ply was easily peeled off. ○: 4 to 7 people felt that the ply was easily peeled off. △: 8 to 10 people felt that the ply was easily peeled off. ×: 11-15 people felt that the ply was easily peeled off. ××: 16 or more people felt that the ply was easily peeled off.

[0077] [Table 2]

[0078] As is clear from the results shown in Table 2, the kitchen towel rolls of Examples 1 to 15 all maintained a low manufacturing cost, maintained a soft texture, had excellent water absorption, and were less susceptible to ply peeling. In contrast, Comparative Examples 1 to 8 all were inferior in any of the following: manufacturing cost, texture, water absorption, and ply peeling. Therefore, the kitchen towel roll of the present invention can provide a kitchen towel roll that maintains the basis weight of the sheet and the amount of ply bond glue applied, while retaining a soft texture, having excellent water absorption, and being resistant to ply peeling. [Explanation of symbols]

[0079] 1 kitchen towel roll 1a surface 1b back side 1e. The outermost edge of a kitchen towel roll 1x kitchen towel sheet 10 Test Pieces 10a,10d corner 11 Obi 12 Holder 20 Belt Press Section 21 Dewatering roll 22 Yankee Dryer 23 Concave and Convex Belt 24 Wet Paper

Claims

1. A kitchen towel roll is a kitchen towel sheet formed by laminating two plies of a sheet having an embossed pattern on at least one ply with a ply bond glue, and winding the resulting sheet into a roll. The basis weight of one ply of the kitchen towel sheet is 16 g / m ２ 26g / m or more ２ The peel strength is 0.04 N / 100 m or more and 0.22 N / 100 mm or less, The water absorption per unit area of ​​the two plies of the kitchen towel sheet is 340 g / m ２ More than 600g / m ２ The kitchen towel roll is characterized in that the water absorption per unit weight is 7 g or more and 13 g or less.

2. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has a paper thickness of 1.3 mm / 10 plies or more and 5.0 mm / 10 plies or less.

3. The specific volume of the kitchen towel sheet is 7.6 cm ３ / g or more 19.2cm ３ 2. The kitchen towel roll of claim 1, wherein the kinematic viscosity is 0.1 to 1.0 MPa.

4. 2. The kitchen towel roll according to claim 1, wherein the kitchen towel sheet has an uneven pattern derived from a papermaking process, the uneven pattern being different from the embossed pattern.

5. The embossed pattern is linear, 2. The kitchen towel roll according to claim 1, wherein the area of ​​the linear embossing pattern occupied by embossments having a width of 0.1 mm to 4 mm and a length of 5 mm or more is 5% to 40% of the sheet area of ​​the kitchen towel sheet.

6. 2. The kitchen towel roll according to claim 1, wherein the ply bond glue is a polyvinyl alcohol-based adhesive having a pH of 5 or more and 8 or less at 25° C. and containing a synthetic resin.

7. 2. The kitchen towel roll according to claim 1, wherein the viscosity of the ply bond glue at 30° C. is 20 mPa·s or more and 75 mPa·s or less.

8. 2. The kitchen towel roll according to claim 1, wherein the non-volatile content of the ply bond glue is 2% or more and 13% or less.

9. The amount of the ply bond glue applied is 0.5 g / m ２ 7.5g / m or more ２ 2. The kitchen towel roll of claim 1, characterized in that:

Images