JP2023162751A - kitchen towel roll - Google Patents

Abstract

To provide a kitchen towel roll comprising a bulk embossment-applied kitchen towel sheet wounded in a roll state, wherein the kitchen towel roll is long-sized and durable, shows no difference in use feeling between the starting and ending of use, and exhibits excellent wiping performance.SOLUTION: Disclosed is a kitchen towel roll comprising a kitchen towel sheet formed by bonding embossment pattern-provided sheets to form a 2-ply laminate, followed by winding up to a roll state, wherein the kitchen towel roll is characterized by that the sheet has an irregularity pattern derived by a papermaking process different from an embossment pattern and has a specific volume of 7 cm3/g or over and 22 cm3/g or under; the kitchen towel roll has a wound length of 20 m or over and 44 m or under; and when a roll density of the roll at a winding start part is shown as a, a roll density at an intermediate part is shown as b, and a roll density at a winding end part is shown as c, (a/c)×100(%) is 90% or over and 130% or under and (b/c)×100(%) is 95% or over and 120% or under.SELECTED DRAWING: Figure 1

Description

The present invention relates to kitchen towel rolls.

In recent years, various kinds of kitchen towels and kitchen towel rolls obtained by winding the kitchen towels into rolls have been developed.

Due to its intended use, kitchen towel rolls are required to have functionality and usability, such as high water absorption and ease of wiping. Additionally, like toilet rolls, there is a growing need for long (long-lasting) roll products that have long rolls and can eliminate the hassle of replacement.

For example, Patent Document 1 states that one sheet or two or more sheets made of pulp as a main component are stacked together to form a set, and the basis weight of one set is 15 g/m ² or more and 50 g/m ² or less, oil absorption / The basis weight is 4.5 OIL-g/g or more and 7.5 OIL-g/g or less, and the length of the measurement field of view of the part that has been avoided from embossing in a mechanical process other than the paper machine is 1.0 mm or more and 1.4 mm. Disclosed is a kitchen towel in which the height difference between the surface irregularities is 100 μm or more and 600 μm or less, and the area ratio of the concavities on the surface is 2% or more and 12% or less when scanned under the conditions of a scan area of 10 cm x 10 cm. . Furthermore, a method for manufacturing a kitchen towel is disclosed, in which a textured fabric is pressed onto a wet paper web to perform texture at the same time as dehydration, and then dry the wet paper web. According to Patent Document 1, a kitchen towel containing pulp as a main component and having a high oil absorption amount even though the basis weight is low is provided.
Furthermore, Patent Document 2 discloses a tissue paper making apparatus that produces high bulk tissue paper. The apparatus has a press portion for pressing and texturing a wet fibrous web, the pressing portion comprising a texturing belt having a texturing layer, the texturing layer being non-woven. , having a web carrying side with a surface that cooperates with the fibrous web, the surface having depressions or raised areas forming a three-dimensional structure. According to Patent Document 2, high-bulk tissue paper is provided which has a bulk of at least 8 cm ³ /g and 20 cm ³ /g or less and can be manufactured at low energy cost using pressing technology.
Further, U.S. Pat. No. 5,001,000 describes a method of manufacturing a rolled paper product comprising: providing at least one paper web; and using an embossed pattern covering at least about 22% of the total surface area of the at least one web; embossing the at least one web, wherein the pattern includes at least about 80% linear embossing, and the caliper of the finished product is smaller than the caliper of the embossed base sheet. Rolled paper products and methods of making the same are disclosed.

International Publication No. 2014/041681 Special Publication No. 2011-506780 Special table 2016-540530 publication

However, when producing kitchen towel rolls using bulky base paper, the base paper itself is bulky and embossed, making it difficult to roll it up compactly and over a long period of time.

On the other hand, if a pattern is used to reduce the paper thickness through embossing, as in Patent Document 3, it is possible to make the roll more compact, but the paper thickness within the roll becomes too low, reducing consumption. There is a problem in that users feel that the feeling of use differs from the time they start using it to the time they finish using it.

Therefore, the present invention has been made in view of the above-mentioned problems, and provides a kitchen towel roll made by winding up a bulky and embossed kitchen towel sheet into a roll shape, which is long and long-lasting, and which can be used both at the beginning and end of use. To provide a kitchen towel roll that has no difference in usability and has excellent wipeability.

The inventors of the present invention conducted extensive research in order to solve the above problems. As a result, in a kitchen towel roll made by winding up a bulky and embossed kitchen towel sheet into a roll, we applied an uneven pattern different from the embossed pattern to the specific volume of the kitchen towel sheet, the winding length of the kitchen towel roll, and the winding end. It has been found that the above-mentioned problem can be solved by adjusting the ratio of the winding density of each of the winding start part and the middle part to the winding density of the part, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a kitchen towel roll in which a sheet with an embossed pattern is bonded with glue and a two-ply laminated kitchen towel sheet is wound up into a roll. The towel sheet has an uneven pattern derived from the papermaking process that is different from the embossed pattern, and has a specific volume of 7 cm ³ /g or more and 22 cm ³ /g or less, and the kitchen towel roll has a winding length of 20 m or more and 44 m or less. , the winding density at the beginning of the roll (1% to 33%) is a, the winding density at the middle part (34% to 66%) is b, and the winding density at the end (100%) is c A kitchen towel roll characterized in that (a/c)×100(%) is 90% or more and 130% or less, and (b/c)×100(%) is 95% or more and 120% or less. It is.

(2) A second aspect of the present invention is the kitchen towel roll according to (1), characterized in that the amount of water absorbed per 1 m ² of two plies of the kitchen towel sheet is 220 g or more and 600 g or less. It is something to do.

(3) A third aspect of the present invention is the kitchen towel roll according to (1), wherein the kitchen towel roll has a winding density of 0.22 m/cm ² or more and 0.68 m/cm ² or less. This is a characteristic feature.

(4) A fourth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the embossing depth in the embossing pattern is 0.06 mm or more and 1.1 mm or less. It is something.

(5) A fifth aspect of the present invention is the kitchen towel roll according to (1), in which the root mean square height of the surface roughness of the portion of the kitchen towel sheet to which the embossed pattern is not provided. is 35 μm or more and 180 μm or less.

(6) A sixth aspect of the present invention is the kitchen towel roll according to (1), characterized in that the kitchen towel roll has a core outer diameter of 25 mm or more and 55 mm or less.

Therefore, according to the present invention, in a kitchen towel roll obtained by winding up a bulky and embossed kitchen towel sheet into a roll, it is long and long-lasting, there is no difference in the feeling of use between the beginning and end of use, and it is easy to wipe off. We can provide excellent kitchen towel rolls.

FIG. 1 is a perspective view showing the appearance of the kitchen towel roll of the present invention. It is a figure which shows an example of the emboss pattern in the kitchen towel roll of this invention. FIG. 3 is a diagram showing a height profile on an XY plane using a microscope in shading. FIG. 3 is a graph showing a height profile on an XY plane measured by a microscope. FIG. 3 is a diagram showing how to determine the depth of embossing for an emboss pattern. FIG. 3 is a diagram showing the height profile of a non-embossed portion on an XY plane using a microscope in shading. FIG. 3 is a diagram showing a method for measuring water absorption of a kitchen towel roll according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail, but the following embodiments are presented for the purpose of illustration, and the present invention is not limited to the embodiments shown below.

<Kitchen towel roll>
FIG. 1 is a perspective view showing the appearance of a kitchen towel roll 1 of the present invention. The kitchen towel roll 1 of the present invention is a kitchen towel roll 1 in which a sheet provided with an embossed pattern is adhesively treated with glue and a two-ply stacked kitchen towel sheet 1x is wound into a roll shape. Note that the kitchen towel sheet 1x is preferably perforated in the width direction at equal intervals in the flow direction.

As shown in FIG. 1, among the surfaces of the kitchen towel sheet 1x, the surface facing the outside of the roll is referred to as the surface 1a (the surface of the kitchen towel sheet 1x), and the surface facing the center of the roll is referred to as the back surface 1b (the surface of the kitchen towel sheet 1x). The edge of the outermost roll of the kitchen towel sheet is called the edge 1e.

(roll length and diameter)
The length of the kitchen towel roll 1 is 20 m or more and 44 m or less. Moreover, it is preferable that the roll diameter DR of the kitchen towel roll 1 is 110 mm or more and 189 mm or less. If the winding length is less than 20 m, replacement frequency will be high, and if the winding length exceeds 44 m, it will be bulky. If the roll diameter DR is less than 110 mm, the sheet or embossing will be crushed, resulting in poor water absorption, or the roll length will become short, resulting in high replacement frequency. If the roll diameter DR exceeds 189 mm, the roll will become bulky and the roll density will decrease. Because of its bulk, it is difficult to improve water absorption.

The winding length is preferably 22 m or more and 37 m or less, more preferably 24 m or more and 33 m or less. The winding diameter DR is more preferably 130 mm or more and 176 mm or less, and even more preferably 140 mm or more and 163 mm or less.
The roll length is actually measured by measuring the length of 10 kitchen towel sheets 1x between the perforations of the kitchen towel roll 1. Thereafter, the number of sheets in the kitchen towel roll 1 is actually measured, and the winding length is determined by proportional calculation from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80 m and the number of sheets is 150 sheets, then 1.80 m x (150/10) = 27 m. Note that if the kitchen towel roll 1 does not have perforations, the roll length can be measured by actual measurement. Moreover, the winding diameter DR of the roll is measured using the Diameter Rule manufactured by Muratec KDS Corporation. In the measurement, 10 kitchen towel rolls 1 were measured and the measurement results were averaged.
Further, the length between perforations (length of the sheet in the machine direction) is preferably 100 mm or more and 270 mm or less, more preferably 125 mm or more and 240 mm or less, and even more preferably 150 mm or more and 210 mm or less. By setting it within this range, when using the kitchen towel roll 1 with good water absorbency as in the present application, the area to be used becomes appropriate and the amount of water absorption can be made good.

(Roll width and roll mass)
The roll width of the kitchen towel roll 1 is preferably 150 mm or more and 380 mm or less, more preferably 200 mm or more and 340 mm or less, and even more preferably 250 mm or more and 300 mm or less. By setting it within this range, when using the kitchen towel roll 1 with good water absorbency as in the present application, the area to be used becomes appropriate and the amount of water absorption can be made good.
Further, the roll mass of the kitchen towel roll 1 is preferably 160 g or more and 550 g or less, more preferably 230 g or more and 450 g or less, and even more preferably 270 g or more and 380 g or less. By setting it within this range, when using the kitchen towel roll 1 with good water absorbency as in the present application, it is possible to improve the frequency of replacement without adding bulk.
Note that the roll mass is the mass per 280 mm of roll width not including the core (paper tube). If the roll width is not 280 mm, convert it to the mass per 280 mm by proportional calculation.

(roll density)
The roll density of the kitchen towel roll 1 is preferably 0.04 g/cm ³ or more and 0.15 g/cm ³ or less. If the roll density of the kitchen towel roll 1 is less than 0.04 g/cm ³ , it will be difficult to improve water absorption even though the kitchen towel roll 1 is bulky. Furthermore, if the roll density of the kitchen towel roll 1 exceeds 0.15 g/cm ³ , the paper thickness and specific volume will be low, and the water absorption will be poor.
The roll density of the kitchen towel roll 1 is more preferably 0.05 g/cm ³ or more and 0.13 g/cm ³ or less, and more preferably 0.06 g/cm ³ or more and 0.09 g/cm ³ or less. preferable.

Roll density is expressed as (roll mass)/(roll volume). The roll mass is the mass of the kitchen towel roll 1 per roll width of 280 mm. The roll volume is expressed as [{cross-sectional area of the outer diameter portion of the roll (rolling diameter DR)}−(cross-sectional area of the outer diameter portion of the core)]×roll width (converted to around 280 mm). For example, if the roll mass (excluding the core) per roll width of 280 mm is 382 g, the winding diameter is 150 mm, and the outer diameter of the core is 39 mm, the roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) ² - 3.14×(39mm÷2÷10) ² }×(280mm÷10)]=0.083g/ ^cm3 . In addition, when the kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI.

(winding density)
The winding density of the kitchen towel roll 1 is preferably 0.22 m/cm ² or more and 0.68 m/cm ² or less. If the winding density of the kitchen towel roll 1 is less than 0.22 m/cm ² , it is difficult to wind up the long kitchen towel roll 1 compactly. Moreover, if the winding density of the kitchen towel roll 1 exceeds 0.68 m/cm ² , the embossment will be crushed, resulting in a decrease in water absorption and making it difficult to wipe off.
The winding density of the kitchen towel roll 1 is more preferably 0.25 m/cm ² or more and 0.54 m/cm ² or less, and more preferably 0.28 m/cm ² or more and 0.40 m/cm ² or less. preferable.

The winding density is expressed as (winding length x number of plies)/(cross-sectional area of roll). The cross-sectional area of the roll is expressed as {cross-sectional area of the outer diameter portion of the roll (rolling diameter DR)−(cross-sectional area of the outer diameter portion of the core (paper tube))}. The core outer diameter DI is the diameter of the center hole of the roll.
For example, in the case of winding length 27 m, 2 plies, winding diameter DR 150 mm, and core outer diameter DI 39 mm, winding density = (27 m x 2) ÷ {3.14 x (150 mm ÷ 2 ÷ 10) ² - 3.14 x (39 mm ÷ 2÷10) ² }=0.33m/ ^cm2 . When the kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the core outer diameter DI.

In addition, in the kitchen towel roll 1, the winding density at the beginning of the roll (1% to 33%) is a, the winding density at the middle part (34% to 66%) is b, and the winding density at the end (100%). ), when c is the winding density of (a/c)×100(%) is 90% or more and 130% or less, and (b/c)×100(%) is 95% or more and 120% or less. If (a/c) x 100 (%) is less than 90% or (b/c) x 100 (%) is less than 95%, the kitchen towel sheet 1x will wrinkle and the wiping performance will decrease. . If (a/c) x 100 (%) exceeds 130% or (b/c) x 100 (%) exceeds 120%, the emboss will collapse, reducing water absorption or making it difficult to wipe off. . At this time, the winding density c at the end of winding is the winding density of the unused kitchen towel roll 1. The winding density in each part is calculated by unwinding the kitchen towel sheet 1x by a certain length (for example, 50 cm), measuring the winding diameter at the time of unwinding, and calculating the winding density. At this time, the "rolling length" in the above formula is calculated using the value obtained by subtracting the "unwound length" from the "rolling length of the kitchen towel roll 1." This operation is repeated to determine the winding density b at the middle portion and the winding density a at the beginning of winding. Note that the period from the start of winding to the end of winding of the roll is expressed as 1% to 100%, where 0% corresponds to the outermost edge of the outer diameter of the core (core outer diameter DI) below.
Note that (a/c)×100(%) is preferably 95% or more and 120% or less, more preferably 100% or more and 110% or less. (b/c)×100(%) is preferably 98% or more and 115% or less, more preferably 100% or more and 110% or less. The winding density in each part can be controlled by adjusting the timing of accelerating or decelerating the winding speed immediately after the start of winding and the nip pressure of the rider roll when winding the kitchen towel roll 1 using a roll winder during manufacturing. I can do it.

(core outer diameter)
Moreover, it is preferable that the core outer diameter DI, which is the outer diameter of the core of the kitchen towel roll 1 of the present invention, is 25 mm or more and 55 mm or less. By having the core outer diameter DI within the above range, it is easy to realize uniform winding of the kitchen towel roll 1, and when the roll diameter DR is constant, it is easy to make it long.
Note that the core outer diameter DI is more preferably 30 mm or more and 50 mm or less, and even more preferably 35 mm or more and 45 mm or less. The core outer diameter DI was measured using a Diameter Rule manufactured by Muratec KDS Corporation. In the measurement, 10 kitchen towel rolls 1 were measured, and the measurement results were averaged.
Furthermore, the mass of the core (paper tube) per roll width of 280 mm is preferably 5 g or more and 22 g or less, more preferably 7 g or more and 17 g or less, and even more preferably 9 g or more and 13 g or less.

<Kitchen towel sheet>
(Basic weight)
The basis weight of the two-ply kitchen towel sheet 1x of the present invention is preferably 30 g/m ² or more and 54 g/m ^{2 or} less. If the basis weight of the 2-ply is less than 30 g/m ² , the water absorption amount of the kitchen towel sheet 1x will be poor. If the basis weight exceeds 54 g/m ² , the production cost of the kitchen towel roll 1 will increase. The basis weight of the two-ply kitchen towel sheet 1x is more preferably 34 g/m ² or more and 50 g/m ² or less, and even more preferably 38 g/m ² or more and 46 g/m ² or less. Basis weight is measured based on JIS P 8124.

In addition, the basis weight per ply of the kitchen towel sheet 1x is preferably 14 g/m ² or more and 28 g/m ² or less for both the front surface 1 a and the back surface 1 b, and preferably 16 g/m ² or more and 26 g/m ² or less. More preferably, it is 18 g/m ² or more and 24 g/m ² or less. The basis weight per ply is determined by measuring the basis weight of two plies, peeling off the ply, measuring the mass of the front side 1a and the back side 1b, and calculating the basis weight of the front side 1a and the back side 1b from the mass ratio. .
Furthermore, in the kitchen towel sheet 1x, the basis weight of the back surface 1b is preferably higher than the basis weight of the front surface 1a by 0.1 g/m ² or more and 1 g/m ² or less. Since the front surface 1a has an embossed pattern to be described later, it tends to absorb less water than the back surface 1b. By increasing the basis weight of the back surface 1b, the water absorption amount of the back surface 1b can be increased, thereby increasing the overall water absorption amount. The basis weight of the back side 1b is more preferably higher than the basis weight of the front side 1a by 0.1 g/m ² or more and 0.8 g/m 2 or less, and 0.2 g/m ^{2 or} more and 0.5 g/m ² or less higher. is even more preferable.

(paper thickness)
Further, the paper thickness of the kitchen towel sheet 1x is preferably 1.3 mm/10 sheets or more and 5 mm/10 sheets or less. If the paper thickness is less than 1.3 mm/10 sheets, the water absorption amount of the kitchen towel sheet 1x will be poor, and if it exceeds 5 mm/10 sheets, it will be difficult to improve the water absorption amount even though it is bulky. In addition, the paper thickness of the kitchen towel sheet 1x is more preferably 2.0 mm/10 sheets or more and 4.4 mm/10 sheets or less, and 2.6 mm/10 sheets or more and 3.8 mm/10 sheets or less. More preferred. The paper thickness is measured using a thickness gauge (Dial Thickness Gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a measuring tip diameter of 30 mm.The sample is placed between the measuring tip and the measuring stand, and the gauge is read when the measuring tip is lowered at a speed of 1 mm or less per second. Five sets of 1x 2-ply kitchen towel sheets were stacked and 10 sheets were measured. In addition, the measurement is repeated 10 times at different locations and the measurement results are averaged.

(embossed pattern)
The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an embossed pattern. Further, the kitchen towel sheet 1x in the present invention is embossed on the sheet and then laminated to form a two-ply sheet. When laminating two plies, ply bond glue is used to apply glue and perform adhesion processing. By adhering in this way to form two plies, the adhesion between the plies becomes strong, and even if the kitchen towel sheet 1x gets wet, the plies will not peel off and will not be easily torn.

An embossed pattern is applied to the ply on the surface 1a of the kitchen towel sheet 1x. By applying the embossed pattern to the surface 1a, glue can be applied to the embossed part of the embossed pattern for adhesion, making it difficult for the ply of the kitchen towel sheet 1x to peel off, and keeping the amount of water absorption within a certain range. can do. The emboss pattern is not particularly limited as long as it is a pattern commonly applied to kitchen towels, such as dots or lines, but a linear emboss pattern is particularly preferred. Specifically, as a linear emboss pattern, as shown in Fig. 2, one pattern consists of a generally circular shape with other patterns inside, and an approximately line pattern on the top, bottom, left and right. The pattern is not particularly limited as long as it is symmetrical and includes two figures of two types each including a combination of a plurality of curves and figures. Regarding the substantially circular shape, it is preferable that the substantially circular shape is doubled.
Regarding the dimensions of the embossed pattern, it is preferable that the rectangle E surrounding the embossed pattern (E is not an embossed pattern) is a square with sides of 2 cm or more and 25 cm or less, and it is a square with sides of 5 cm or more and 20 cm or less. is more preferable, and even more preferably a square with sides of 8 cm or more and 15 cm or less. Regarding this rectangle E, the vertical direction is preferably parallel to the flow direction of the kitchen towel roll 1, and the horizontal direction is preferably parallel to the width direction of the kitchen towel roll 1, but it may be inclined. By using such a pattern, in the kitchen towel sheet 1x having a high water absorption amount as in the present application, the amount of water absorption can be improved, and the ply is not easily peeled off and the wipeability is improved.

At this time, for linear emboss patterns with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more, the total length of the emboss is 50 cm/100 cm ² or more 550 cm/ It is preferably 100 cm ² or less, more preferably 80 cm/100 cm ² or more and 410 cm/100 cm ² or less, and even more preferably 110 cm/100 cm ² or more and 300 cm/100 cm ² or less.
The above total length is the emboss length for an emboss with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more inside the rectangle E that includes all of one emboss pattern as shown in Figure 2. Measure the total length by adding up the total length, and use it as the total length per 100 ^cm2 . The size of one side of this quadrangle E can be changed as appropriate depending on the size of the embossed pattern. Note that if a rectangle that includes all the embossed patterns includes an embossed pattern adjacent to the embossed pattern included in the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length. Furthermore, if the size of one side of the square E cannot be clearly determined based on the emboss pattern, the size of the square E is set to 10×10 cm, and the total length of the emboss included in the square E is measured. By setting the total length within the above range, in the kitchen towel sheet 1x having a high water absorption amount as in the present application, the amount of water absorption can be improved, and the ply is difficult to peel off, resulting in good wiping performance. The total length is determined by actual measurements using the method described above. Note that the measurement may be performed using a general microscope.

In the emboss pattern, the depth of the emboss is preferably 0.06 mm or more and 1.1 mm or less. By setting the depth of the embossing within the above numerical range, it is easy to wind up the kitchen towel roll 1 uniformly, and the amount of water absorption is optimized, making it possible to make the kitchen towel sheet 1x comfortable to use. .
The depth of the embossing in the embossing pattern is more preferably 0.10 mm or more and 0.80 mm or less, and even more preferably 0.20 mm or more and 0.55 mm or less.

The depth of embossing is measured using a microscope. As the microscope, the product name "One-shot 3D measurement macroscope VR-3100" manufactured by KEYENCE can be used. The product name "VR-H1A" can be used as microscope image observation/measurement/image analysis software. Further, the measurement conditions are a magnification of 25 times and a visual field area of 12 mm x 9 mm. The measurement magnification and visual field area may be changed as appropriate depending on the desired size of the embossing.

FIG. 3 shows a height profile on the XY plane measured using a microscope, and the height of the surface of the kitchen towel sheet 1x is expressed in shading. The linear portions in FIG. 3 whose shading differs from the surrounding areas indicate individual embossing. The depth of the emboss is determined by measuring the height difference of the emboss using the microscope. Note that the measurement is performed on the surface 1a side of the kitchen towel sheet 1x. In addition, at the time of measurement, three turns of the kitchen towel sheet 1x are removed from the kitchen towel roll 1, and the fourth turn of the kitchen towel sheet 1x is used to measure the 2-ply sheet. Also, if there are perforations, avoid them when measuring.
First, line segment AB is drawn as shown in FIG. 3 to obtain the height profile shown in FIG. Note that the line segment AB may be drawn across the embossing. In addition, the line segment AB is drawn so that it is in the width direction (CD direction) of the kitchen towel sheet 1x, but if the distance between the embossments is narrow, for example 2 mm or less, the height of the protrusions described below will be low. The line segments may be drawn diagonally or in the flow direction. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the sample surface of the actual kitchen towel sheet 1x. It also includes noise peaks (e.g., sharp peaks caused by areas with no fibers), and it is necessary to remove such noise peaks when calculating the height difference of unevenness.

Therefore, the (measured) cross-sectional curve S in FIG. 4 is smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the cross-sectional curve W in FIG. 5. Note that smoothing using the weighted average radio button filter can be automatically obtained using the above analysis software. Then, in the graph shown in FIG. 5, the average value of the maximum value of the vertical axis of the convex part H1 of the graph and the convex part H2 adjacent to the convex part H1 is calculated, and The minimum value of the vertical axis in the recess D1 is determined. The value obtained by subtracting the minimum value from the average value of the maximum values obtained in this manner is set as the provisional embossing depth. Then, as shown in FIG. 5, similar measurements are made at two consecutive locations on the cross-sectional curve (concave portion D1 and concave portion D2 sandwiched between convex portions H3 and H4). two measurements are obtained at one time). After that, the same measurement as above was performed at each position where the kitchen towel roll 1 was rotated 90 degrees three times in the flow direction of the kitchen towel sheet 1x (the number of measurement positions in the flow direction was 4 in total), and the total The average value of 8 locations (2×4) is finally adopted as the embossing depth.
In addition, since the kitchen towel sheet 1x of the present invention has an uneven pattern derived from the papermaking process that is different from the embossed pattern, there is variation in the heights of the left and right protrusions sandwiching the recess. Therefore, if there is a difference of 0.2 mm or more in the vertical axis values between a convex part that sandwiches a concave part and a convex part (for example, a convex part H3 and a convex part H4 that sandwich a concave part D2), measure at a location that avoids that part. conduct.

Furthermore, the ratio of emboss depth in the emboss pattern to the paper thickness of the entire kitchen towel sheet 1x, which is the ratio of the emboss depth in the emboss pattern/the paper thickness of the entire kitchen towel sheet 1x, is 0.02 or more and 0.02 or more. It is preferably 4 or less. If the ratio is less than 0.02, the amount of water absorbed per 1 m ² between the two plies of the kitchen towel sheet 1x will be low, resulting in poor water absorption as a whole and the plies will easily peel off. If the ratio exceeds 0.4, it will be difficult to improve water absorption despite the bulk. In addition, the ratio of embossing depth/paper thickness of the entire kitchen towel sheet 1x in the embossing pattern is more preferably 0.04 or more and 0.35 or less, and more preferably 0.08 or more and 0.20 or less. preferable.

There is no particular restriction on whether or not the ply on the back surface 1b of the kitchen towel sheet 1x has an embossed pattern, as long as it has an uneven pattern derived from the papermaking process that is different from the embossed pattern. It may be nested embossed, pin-to-pin embossed, or not embossed, but preferably nested embossed or no embossed, more preferably no embossed. Conventional kitchen towels use pin-to-pin or nested formats to ensure water absorption, but when thick base paper is used as in the present application, the embossment prevents the paper from being crushed. This will reduce the amount of water absorbed. For this reason, it is preferable that the front surface 1a is linearly embossed and the back surface 1b is not embossed.

At this time, the root mean square height Sq of the surface roughness in a portion of the kitchen towel sheet 1x to which the embossed pattern is not provided (hereinafter also referred to as a non-embossed portion) is preferably 35 μm or more and 180 μm or less. When the root mean square height Sq of the surface roughness is less than 35 μm, the water absorbency of the kitchen towel sheet 1x decreases and it is difficult to wipe it off. Moreover, when the root mean square height Sq of the surface roughness exceeds 180 μm, it is difficult to adjust the winding of the kitchen towel roll 1 uniformly.
Note that the root mean square height Sq of the surface roughness is more preferably 50 μm or more and 150 μm or less, and even more preferably 60 μm or more and 100 μm or less.
The root mean square height Sq of the surface roughness of the non-embossed portion is measured using a microscope. As for the microscope, the product name "One Shot 3D Measurement Macroscope VR-3100" manufactured by KEYENCE can be used, as in the case of the emboss depth described above. The product name "VR-H1A" can be used as microscope image observation/measurement/image analysis software. Further, the measurement conditions are a magnification of 38 times and a visual field area of 8 mm x 6 mm. The measurement magnification and visual field area may be changed as appropriate depending on the desired size of the embossing.

For the obtained image shown in FIG. 6, a filter is set in the same way as for the emboss depth described above. Specifically, by setting the S-filter (low-pass filter), components with a scale smaller than the cutoff wavelength can be set, and by setting the L-filter (high-pass filter), components with a scale larger than the cutoff wavelength can be detected. Remove from the image. Here, the S-filter is 500 μm, and the L-filter is 8 mm. If the S-filter and L-filter are selected, the root mean square height Sq is automatically calculated.
As with the emboss depth, the non-embossed portion is measured in a 2-ply sheet state by removing three turns of the kitchen towel sheet 1x from the kitchen towel roll 1 and using the kitchen towel sheet 1x from the fourth turn. Also, if there are perforations, avoid them when measuring. Measurements were taken at two locations in the width direction of the kitchen towel roll 1, and then the same measurement as above was performed at each position where the kitchen towel roll 1 was rotated 90 degrees three times in the flow direction of the kitchen towel sheet 1x (flow direction). (The number of measurement positions in the direction is 4 in total), and the average value of a total of 8 locations (2 x 4) is finally adopted as the root mean square height Sq.

(Water absorption amount)
In the present invention, it is preferable that the amount of water absorbed per 1 m ² of 2 plies of kitchen towel sheet 1x is 220 g or more and 600 g or less. If the water absorption amount per 1 m ² is less than 220 g, the kitchen towel sheet 1x will not absorb water sufficiently and will be difficult to wipe off, and if it exceeds 600 g, the specific volume of the kitchen towel sheet 1x will become large and will likely become difficult to wipe off. In addition, the amount of water absorbed per 1 m ² is more preferably 270 g or more and 550 g or less, and even more preferably 370 g or more and 480 g or less.
Further, it is preferable that the amount of water absorbed per gram of the two-ply kitchen towel sheet 1x is 6 g or more. If the water absorption amount per gram is less than 6 g, it will be inferior to the water absorption amount of kitchen towel sheet 1x. In addition, the amount of water absorbed per 1 g is more preferably 7.0 g or more and 14.0 g or less, and even more preferably 8.0 g or more and 12.0 g or less.

Furthermore, it is preferable that the amount of water absorbed per 1 m ² between two plies of the kitchen towel sheet 1x is 100 g or more and 300 g or less. If the water absorption amount per 1 m ² between the two plies is less than 100g, it will be inferior to the water absorption amount of kitchen towel sheet 1x, and if it exceeds 300g, the paper thickness of kitchen towel sheet 1x will be high, making it bulky and bulky. It becomes difficult to improve water absorption. At this time, the water absorption amount per 1 m ² between the 2 plies is calculated from the water absorption amount per 1 m ² of the 2 plies, the water absorption amount per 1 m ² of the 1 ply (front surface 1a), and the water absorption amount per 1 m 2 of the 1 ply (back surface 1b), which will be described later. This is the value obtained by subtracting the amount of water absorbed per 1 ^m2 .
The amount of water absorbed per 1 m ² between the two plies is more preferably 130 g or more and 280 g or less, and even more preferably 160 g or more and 260 g or less. Each water absorption amount of kitchen towel sheet 1x is measured as follows.

First, a kitchen towel sheet 1x stacked in two plies is taken and cut using a square template with each piece measuring 7.6 cm (3 inches) to produce a rectangular test piece 200 with each side 7.6 cm. The mass of the test piece 200 before water absorption is measured using an electronic balance. The test piece 200 is set in a holder 220 (a jig that fixes three points on the test piece, and the jig is made of metal that does not absorb water).
Next, distilled water is poured into a commercially available vat to a depth of 2 cm, and the test piece set in the holder is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece is taken out from the distilled water together with the holder, and a band 210 is attached to one corner 200d of the test piece 200, as shown in FIG. The band 210 is made by cutting a kitchen towel sheet 1x, which is the same as the sample to be measured, into a size of 2 mm width x 15 mm length, peeling off the ply, and using the 1 ply on the back side, from the corner 200d of the test piece 200 toward the center. Paste it on the 6mm part. Next, the holder and the test piece 200 are hung from a rod installed in an empty water tank with the corner 200a facing the corner 200d facing up, the lid of the water tank is closed, and the test piece 200 is left for 10 minutes. Thereafter, the holder 220 and the test piece 200 are taken out from the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured using an electronic balance. The amount of distilled water absorbed per 1 m ² of the test piece 200 (g of water/m ² of sheet) is calculated from the change in mass of the test piece 200 before and after being immersed in distilled water. Furthermore, by dividing the amount of water absorption per 1 m ² (g of water/m ² of sheet) by the basis weight of 2 plies of test piece 200, the amount of water absorption per 1 m ² (g of water/m ² of sheet)/basis g/sheet m ² )=calculate the amount of water absorbed per 1 g (water g/sheet g). Measurement is performed five times for each sample, and the average value is used.
The water absorption amount of 1 ply was determined by cutting 1 x kitchen towel sheet stacked in 2 plies using a square template with each piece measuring 7.6 cm (3 inches) to obtain 200 rectangular test pieces with each side 7.6 cm. Then, the ply is peeled off, and this is used as a test piece 200 for measuring the water absorption amount of one ply. The measurement method is the same as for 2 ply.
Note that this measurement is performed at a temperature of 23±1° C. and a humidity of 50±2% according to the JIS P 8111 method. Further, distilled water is maintained at 23±1°C.

In addition, in the present invention, the water absorption amount per 1 m ² of 1 ply (surface 1a) of kitchen towel sheet 1x is preferably 50 g or more and 160 g or less, more preferably 60 g or more and 145 g or less, and 70 g or more and 130 g or less. It is more preferable that On the other hand, the water absorption amount per 1 m ² of 1 ply (back side 1b) of 1x kitchen towel sheet is preferably 50 g or more and 165 g or less, more preferably 60 g or more and 150 g or less, and 70 g or more and 135 g or less. More preferably.
In addition, the water absorption amount per 1 g of 1 ply (surface 1a) of kitchen towel sheet 1x is preferably 3.0 g or more, more preferably 3.5 g or more and 7.0 g or less, and 4.0 g or more and 6 It is more preferable that it is .0g or less. On the other hand, the water absorption amount per 1 ply (back side 1b) of 1x kitchen towel sheet is preferably 3.1 g or more, more preferably 3.6 g or more and 7.1 g or less, and 4.1 g. More preferably, the amount is 6.1 g or less.

(specific volume)
The specific volume of the kitchen towel sheet 1x is 7 cm ³ /g or more and 22 cm ³ /g or less. If the specific volume of the kitchen towel sheet 1x is less than 7 cm ³ /g, the water absorbency of the kitchen towel sheet 1x will decrease, and if it exceeds 22 cm ³ /g, the kitchen towel sheet 1x will be difficult to wipe off, and the roll winding will be difficult. It becomes difficult to adjust uniformly. Note that the specific volume is preferably 9 cm ³ /g or more and 20 cm ³ /g or less, and more preferably 12 cm ³ /g or more and 17 cm ³ /g or less. The specific volume is calculated by dividing the paper thickness per 2 plies of 1x kitchen towel sheet by the basis weight per 2 plies, and is expressed as the volume cm ³ per unit g.

(DMDT and DCDT)
It is preferable that the dry longitudinal tensile strength DMDT (Dry Machine Direction Tensile Strength) of 2 plies of 1x kitchen towel sheet is 4.5 N/25 mm or more and 21 N/25 mm or less based on JIS P 8113, and It is preferable that the dry cross direction tensile strength DCDT (Dry Cross Direction Tensile Strength) is 4.5 N/25 mm or more and 21 N/25 mm or less. If DMDT or DCDT is less than 4.5N/25mm, the paper tends to tear when the roll is wound, making it difficult to adjust the winding uniformly. The towel sheet 1x becomes hard and difficult to wipe off.
Note that the DMDT is more preferably 6.0 N/25 mm or more and 17.0 N/25 mm or less, and even more preferably 7.5 N/25 mm or more and 12.0 N/25 mm or less. Further, the DCDT is more preferably 6.0 N/25 mm or more and 17.0 N/25 mm or less, and even more preferably 7.5 N/25 mm or more and 12.0 N/25 mm or less.
Further, the ratio of DMDT to DCDT (DMDT/DCDT) is preferably 0.9 or more and 1.6 or less, more preferably 1.0 or more and 1.4 or less, and 1.0 or more and 1.2 or less. It is more preferable that By setting the ratio (DMDT/DCDT) within the above numerical range, the feeling of use of the kitchen towel sheet 1x in the vertical and horizontal directions can be made to be close to constant.

(WMDT and WCDT)
In addition, the wet longitudinal tensile strength WMDT (Wet Machine Direction Tensile Strength) of the 2-ply kitchen towel sheet 1x based on the old JIS S 3104 shall be 1.5 N/25 mm or more and 8.0 N/25 mm or less. is preferable, and it is also preferable that the wet cross direction tensile strength WCDT (Wet Cross Direction Tensile Strength) is 1.5 N/25 mm or more and 8.0 N/25 mm or less. If WMDT or WCDT is less than 1.5 N/25 mm, kitchen towel sheet 1 x with high water absorption as in the present application tends to tear when absorbing water, and WMDT or WCDT is 8.0 N/25 mm. If it exceeds 1x, the density of the kitchen towel sheet 1x becomes high and the water absorbency becomes poor.
Note that the WMDT is more preferably 2.0 N/25 mm or more and 6.0 N/25 mm or less, and even more preferably 2.5 N/25 mm or more and 4.5 N/25 mm or less. Further, the WCDT is more preferably 2.0 N/25 mm or more and 6.0 N/25 mm or less, and even more preferably 2.5 N/25 mm or more and 4.5 N/25 mm or less.
Further, the ratio of WMDT to WCDT (WMDT/WCDT) is preferably 0.9 or more and 1.6 or less, more preferably 1.0 or more and 1.4 or less, and 1.0 or more and 1.2 or less. It is more preferable that By setting the ratio (WMDT/WCDT) within the above numerical range, the feeling of use of the kitchen towel sheet 1x in the vertical and horizontal directions can be made to be nearly constant.

(Ply peel strength)
The ply peel strength of the kitchen towel sheet 1x is preferably 0.04 N/75 mm or more and 2.1 N/75 mm or less. If the ply peel strength is less than 0.04 N/75 mm, the plies will peel off from each other and be difficult to wipe off, and if the ply peel strength exceeds 2.1 N/75 mm, the water absorption amount of the kitchen towel sheet 1x will be poor.
The ply peel strength of the kitchen towel sheet 1x is more preferably 0.10 N/75 mm or more and 1.2 N/75 mm or less, and even more preferably 0.15 N/75 mm or more and 0.6 N/75 mm or less.
The ply peel strength can be measured by using a tensile tester (STB-1225S, manufactured by A&D Co., Ltd.) according to the tensile test method of JIS P 8113, and according to the method specified in JIS P 8111. under standard conditions. First, a test piece measuring 75 mm in the width direction and 200 mm in the flow direction is taken from a sample of the kitchen towel roll 1. The ply is then stripped 35 mm in the machine direction. One side of the peeled ply is fixed to an upper grip (width 75 mm) by sandwiching it by 15 mm in the flow direction. In addition, the other ply is also fixed to the lower grip (width 75 mm) by sandwiching it by 15 mm in the flow direction. Note that the pitch (interval) of the grips is 20 mm. Next, it was pulled (peeled) at a pulling speed of 100 mm/min, and strength data was collected. Data is acquired every 20 μm, and the data from a distance of 40 mm to 150 mm (measurement length 110 mm) after the start of measurement is averaged, and this is taken as the peel strength (N/75 mm). However, if a perforation is included in the distance from 40 mm to 150 mm after the start of measurement, the distance after the start of measurement must be shortened from 40 mm to, for example, 90 mm (measurement length 50 mm) within a range that does not include the perforation. I can do it.

(Method for manufacturing kitchen towel sheets and kitchen towel rolls)
The kitchen towel sheet 1x and the kitchen towel roll 1 can be manufactured, for example, in the order of (1) paper making and creping, (2) embossing, and (3) roll winding. In the manufacturing process, it is preferred to use through-air dryer technology. At this time, in the papermaking process, an uneven pattern derived from the papermaking process (fabric) that is different from the above-described embossing pattern is applied to the kitchen towel sheet 1x. By having this uneven pattern, the amount of water absorbed by the kitchen towel sheet 1x is further increased. Note that "derived from the paper making process" means that it is applied between the head box of the paper machine and the inlet of the Yankee dryer in the paper making process for kitchen towel sheets 1x, and especially in the through air dryer section where the sheet dries together with the fabric. As a result, unevenness is formed.
Further, the pattern of the unevenness can be changed as appropriate by changing the pattern of the fabric (fine pattern, rough pattern). Although the specific volume (paper thickness) changes when the uneven pattern is changed, it is preferable to select a pattern such that the specific volume (paper thickness) of the base paper falls within the numerical range described below. Further, it is preferable to select a pattern such that the root mean square height Sq of the surface roughness of the non-embossed portion of the kitchen towel sheet 1x falls within the above numerical range.

When using a base paper made using this through-air dryer, it is preferable that the area ratio of the convex portions on the embossing roll for applying the embossing pattern is 4% or more and 40% or less. When the area ratio is less than 4%, in the case of a kitchen towel sheet 1x with good water absorption as in the present application, the plies tend to peel off from each other. If the area ratio exceeds 40%, the paper of the 1x kitchen towel sheet will be crushed and its water absorption will be poor.
The area ratio of the convex portions is more preferably 6% or more and 30% or less, and even more preferably 9% or more and 18% or less. Further, the shape of the convex portion and the emboss alone may be circular, oval, rectangular, square, floral pattern, logo, letters, etc. without particular limitation, but as mentioned above, linear embossing is preferred. This embossing is preferably provided only on the surface 1a of the kitchen towel sheet 1x, as described above.

At this time, the basis weight of two plies of base paper used to manufacture 1x kitchen towel sheet (the basis weight of one ply is doubled) is preferably 31 g/m ² or more and 58 g/m ² or less, and 35 g/m 2 or more. It is more preferably at least 39 g/m ² and at most 54 g/m ² , and still more preferably at least 39 g/m ² and at most 50 g/m ² . Further, the paper thickness is preferably 1.4 mm/10 sheets or more and 5.4 mm/10 sheets or less, more preferably 2.1 mm/10 sheets or more and 4.8 mm/10 sheets or less, and 2.7 mm/10 sheets or more. It is more preferable that the number of sheets is 10 or more and 4.2 mm/10 or less. Furthermore, the specific volume is preferably 7 cm ³ /g or more and 22 cm ³ /g or less, more preferably 9 cm ³ /g or more and 20 cm ³ /g or less, and 12 cm ³ /g or more and 17 cm ³ /g or less. More preferably.

In addition, the ratio of the emboss depth in the emboss pattern to the paper thickness of the base paper of the kitchen towel sheet 1x, which is the ratio of the emboss depth in the emboss pattern/the paper thickness of the base paper of the kitchen towel sheet 1x, is 0.01 or more. It is preferably 0.38 or less, more preferably 0.03 or more and 0.33 or less, and even more preferably 0.07 or more and 0.18 or less. By setting it within this range, in the case of the kitchen towel sheet 1x having good water absorbency like the one of the present application, it is possible to make the sheet less bulky, less likely to peel off the ply, and to have good water absorbency.
In addition, the difference between the specific volume of the kitchen towel sheet 1x and the specific volume of the base paper (the difference between the specific volume of the kitchen towel sheet 1x - the specific volume of the base paper) is such that the ply does not peel off easily without being bulky, and has good water absorption. -3 cm ³ /g or more and 2 cm ³ /g or less, more preferably -2 cm ³ /g or more and 1 cm ³ /g or less, -1 cm ³ /g or more and 0.5 cm ³ /g or less, and -0.5 cm ³ /g or more and 0 cm ³ /g or less is particularly preferable.

Although the embodiments of the present invention have been described in detail above, it goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents that fall within the spirit and scope of the present invention.

Kitchen towel sheets and kitchen towel rolls of Examples 1 to 17 and Comparative Examples 1 to 12 were manufactured through the steps of (1) paper making and creping, (2) embossing, and (3) roll winding. did. The above-mentioned parameters were measured and evaluated for all the kitchen towel rolls of Examples and Comparative Examples.
Regarding the embossed pattern, the number and thickness were changed as appropriate in each Example and each Comparative Example, and all embossments were provided only on the front side of the kitchen towel sheet. In addition, for roll widths other than 280 mm, the mass of the roll was calculated based on the roll width of 280 mm.

The following items were evaluated for the manufactured kitchen towel sheets and kitchen towel rolls.
Longevity: When the monitor used all the kitchen towel rolls, the frequency of replacement (whether one roll lasted long or not) was evaluated.
◎: When "Long lasting" is 18 to 20 people ○: When "Long lasting" is 14 to 17 people △: When "Long lasting" is 10 to 13 people ×: "Long lasting" ” is between 6 and 9 people ××: When there is no “long lasting” or there is between 1 and 5 people

Changes in the feeling of use: Changes in the feeling of use such as good water absorption, texture, resistance to tearing, wrinkles, stiffness, depth of embossing, etc. when the monitor uses the entire kitchen towel roll (from the beginning to the end of use) Differences in usability) were comprehensively evaluated.
◎: When 18 to 20 people answered that there was no change in the feeling of use. ○: When 14 to 17 people said that there was no change in the feeling of use. △: 10 that said there was no change in the feeling of use. ×: When there are 6 or more people and 9 or less people have “no change in the feeling of use” × ×: When there is no “no change in the feeling of use” or 1 or more and 5 or less people

The monitor evaluated the ease of wiping when using a sheet taken from a kitchen towel roll.
◎: When 18 to 20 people say “Easy to wipe off” ○: When 14 to 17 people say “Easy to wipe off” △: When 10 to 13 people say “Easy to wipe off” ×: “Easy to wipe off” ” is between 6 and 9 people. ××: “Easy to wipe” is not available or when there are 1 and 5 people.

The results obtained are shown in Tables 1 and 2.

From the above, even if the kitchen towel roll of the present invention is a kitchen towel roll made by winding up a bulky embossed kitchen towel sheet into a roll, it is long and lasts a long time, and has a good feeling of use at the beginning and end of use. There was no difference, and it was at least proven that the kitchen towel roll had excellent wipeability.

1 Kitchen towel roll 1a Front side 1b Back side 1e Edge of outermost roll of kitchen towel sheet 1x Kitchen towel sheet 200 Test piece 200a, 200d Corner 210 Band 220 Holder

Claims (6)

A kitchen towel roll obtained by winding up a kitchen towel sheet in which a sheet with an embossed pattern is adhesively treated with glue and laminated in two plies into a roll shape,
The kitchen towel sheet has an uneven pattern derived from a papermaking process that is different from the embossed pattern, and has a specific volume of 7 cm ³ /g or more and 22 cm ³ /g or less,
The kitchen towel roll has a winding length of 20 m or more and 44 m or less, the winding density of the beginning part (1% or more and 33% or less) of the roll is a, the winding density of the middle part (34% or more and 66% or less) is b, When the winding density at the end of winding (100%) is c, (a/c) x 100 (%) is 90% or more and 130% or less, (b/c) x 100 (%) is 95% or more and 120 % or less.A kitchen towel roll. The kitchen towel roll according to claim 1, characterized in that the amount of water absorbed per 1 m ² of two plies of the kitchen towel sheet is 220 g or more and 600 g or less. The kitchen towel roll according to claim 1, wherein the kitchen towel roll has a winding density of 0.22 m/cm ² or more and 0.68 m/cm ² or less. The kitchen towel roll according to claim 1, wherein the embossing depth in the embossing pattern is 0.06 mm or more and 1.1 mm or less. The kitchen towel roll according to claim 1, wherein the root mean square height of the surface roughness of the portion of the kitchen towel sheet to which the embossed pattern is not provided is 35 μm or more and 180 μm or less. The kitchen towel roll according to claim 1, wherein the core outer diameter of the kitchen towel roll is 25 mm or more and 55 mm or less.