JP2022116768A - kitchen towel roll - Google Patents

Abstract

To provide a kitchen towel roll which is excellent in water absorption, does not cause ply peeling, and is low in exchange frequency even under the condition that a basis weight is not excessively high but within a prescribed range.SOLUTION: A kitchen towel roll 1 performs adhesion processing of a sheet to which embossment patterns are imparted with glue and winds up a kitchen towel sheet 1x laminated in 2 ply into a roll shape. In the kitchen towel roll 1, the kitchen towel sheet has a rugged pattern originated in a papermaking step different from the embossment patterns, has a basis weight in 2 ply between 30 g/m2 and 54 g/m2, a paper thickness between 1.3 mm/10 and 5 mm/10, an amount of water absorption per 1 m2 in 2 ply between 220 g and 600 g, a wound length of the kitchen towel roll 1 between 14 m and 44 m, and a winding diameter between 110 mm and 189 mm.SELECTED DRAWING: Figure 1

Description

The present invention relates to kitchen towel rolls.

In recent years, various types of kitchen towels have been developed. Water absorption and oil absorption are important for kitchen towels, and papermaking techniques for increasing water absorption and oil absorption have been developed. In addition, technology has been developed to reduce paper thickness using embossed patterns.

For example, in Patent Document 1, pulp is the main component, one sheet or two or more sheets are stacked, and one set has a basis weight of 15 to 50 g/m ² and an oil absorption/basis weight of 4.5 to 4.5. It is 7.5 OIL-g/g, and when the length of the measurement field of view avoiding mechanical embossing performed in a process other than the paper machine is 1.0-1.4 mm, the height difference of the unevenness of the surface is 100 to 600 μm, the area ratio of the recesses on the surface is 2 to 12%, and a dry crepe is applied, and a method for producing the same is disclosed.
Also, in US Pat. No. 5,200,000, a texturing layer of a texturing belt for texturing a wet fibrous web by pressing in the press section of a tissue papermaking machine producing high bulk tissue paper, comprising: The textured layer is nonwoven and has a web-carrying side with a surface that cooperates with the fibrous web, the surface being characterized by depressions or raised portions that form a three-dimensional structure on the surface. A textured layer, press section and papermaking machine for producing high bulk crepe tissue paper webs, and methods of making the same are disclosed.
Further, US Pat. No. 6,200,000 discloses a method for manufacturing a rolled paper product, comprising the steps of 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 at least one web, wherein the pattern comprises at least about 80% linear embossing, characterized in that the caliper of the finished product is smaller than the caliper of the embossed base sheet; A rolled paper product and method of making the same are disclosed.

Japanese Patent No. 5373208 Japanese Patent Publication No. 2011-506780 Japanese Patent Application Publication No. 2016-540530

However, the amount of water absorption varies depending on the embossing pattern, and it has been difficult to improve the amount of water absorption only by the above papermaking techniques. In particular, when thick base paper obtained by the above papermaking technology is used, embossing in the same manner as normal base paper crushes the paper in the embossed portion, which reduces the water absorption. In other words, in the case of normal base paper, it is common sense to add embossing to increase the bulkiness of the base paper in order to increase the water absorption. It has been found to be difficult to

Therefore, if the number of embossed portions is reduced, the ply will peel off when absorbing water, tearing the paper, and the wiping property will deteriorate. That is, unlike the case of ordinary towel base paper, when the base paper of the above papermaking technology is used, the amount of water absorption increases, so the ply peels off and the paper is easily torn.
Also, as in Patent Document 3, when a pattern that reduces the thickness of the paper by embossing is used, the water absorption may decrease. Of course, if the basis weight is increased, the water absorption is improved, but the cost is increased.

Therefore, the present invention has been made in view of the above problems. To provide a kitchen towel roll that is used less frequently.

The inventors of the present invention conducted intensive research in order to solve the above problems. As a result, it was found that the above problem can be solved by applying an uneven pattern different from the embossed pattern and adjusting the basis weight, paper thickness, water absorption amount of the kitchen towel sheet, and the winding length and winding diameter of the kitchen towel roll. , have completed the present invention. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a kitchen towel roll obtained by bonding a sheet having an embossed pattern with glue and winding a kitchen towel sheet laminated into two plies into a roll, wherein the kitchen The towel sheet has an uneven pattern derived from the papermaking process different from the embossed pattern, and has a two-ply basis weight of 30 g/m ² or more and 54 g/m ² or less, and a paper thickness of 1.3 mm/10 sheets or more. 5 mm/10 sheets or less, water absorption per 1 m ² of 2 plies is 220 g or more and 600 g or less, roll length of the kitchen towel roll is 14 m or more and 44 m or less, and roll diameter is 110 mm or more and 189 mm or less. It is a kitchen towel roll.

(2) A second aspect of the present invention is the kitchen towel roll described in (1), characterized in that the water absorption amount per 1 g of the two plies of the kitchen towel sheet is 6 g or more. be.

(3) A third aspect of the present invention is the kitchen towel roll according to (1) or (2), wherein the water absorption per 1 m ² between the two plies of the kitchen towel sheet is 100 g or more and 300 g or less. It is characterized by

(4) A fourth aspect of the present invention is the kitchen towel roll according to any one of (1) to (3), wherein the embossed depth in the embossed pattern is 0.06 mm or more and 1.1 mm or less. It is characterized by being

(5) A fifth aspect of the present invention is the kitchen towel roll according to any one of (1) to (4), wherein the depth of embossing in the embossed pattern/the thickness of the entire kitchen towel sheet The ratio is characterized by being 0.02 or more and 0.4 or less.

(6) A sixth aspect of the present invention is the kitchen towel roll according to any one of (1) to (5), wherein the kitchen towel roll has a roll density of 0.04 g/cm ³ or more and 0.15 g. /cm ³ or less.

(7) A seventh aspect of the present invention is the kitchen towel roll according to any one of (1) to (6), 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.

(8) The eighth aspect of the present invention is the kitchen towel roll according to any one of (1) to (7), wherein the embossing roll for applying the embossed pattern has an area ratio of 4% of the convex portions. It is characterized by being more than or equal to 40% or less.

(9) A ninth aspect of the present invention is the kitchen towel roll according to any one of (1) to (8), wherein the embossed pattern is linear.

(10) A tenth aspect of the present invention is the kitchen towel roll according to (9), wherein the linear embossed pattern has a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more. The embossing is characterized by having a total length of 50 cm/100 cm ² or more and 550 cm/100 cm ² or less when the length of the embossing is added.

(11) The eleventh aspect of the present invention is the kitchen towel roll according to any one of (1) to (10), wherein the kitchen towel sheet has a surface roughness in a portion where the embossed pattern is not applied. The root-mean-square height of the thickness is 35 μm or more.

(12) A twelfth aspect of the present invention is the kitchen towel roll according to any one of (1) to (11), wherein the kitchen towel sheet does not have an embossed back surface. is.

Therefore, according to the present invention, it is possible to provide a kitchen towel roll that has good water absorbency, is not bulky, does not peel off plies, and is less frequently replaced even under conditions where the basis weight is kept within a certain range without being excessively high. can be done.

1 is a perspective view showing the appearance of a kitchen towel roll of the present invention; FIG. It is a figure which shows an example of the embossing pattern in the kitchen towel roll of this invention. FIG. 10 is a diagram showing a height profile on the XY plane by a microscope in shading. FIG. 4 is a graphical representation of a height profile on the XY plane through a microscope; It is a figure which shows how to obtain|require the depth of embossing about an embossing pattern. FIG. 10 is a diagram showing a height profile of a non-embossed portion on the XY plane by a microscope, with shading. It is a figure which shows the measuring method of the water absorption amount of the kitchen towel roll of this invention.

Embodiments of the present invention will be described in detail below, 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 obtained by winding a kitchen towel sheet 1x in which a sheet having an embossed pattern is glued and laminated in two plies. The kitchen towel sheet 1x is preferably perforated in the width direction at equal intervals in the machine direction.

Further, as shown in FIG. 1, among the surfaces of the kitchen towel sheet 1x, the surface oriented to the outside of the roll is referred to as the surface 1a (surface of the kitchen towel sheet 1x), and the surface oriented to the center of the roll is referred to as the back surface 1b (kitchen towel sheet 1x). back surface of towel sheet 1x).

(winding length and winding diameter)
The winding length of the kitchen towel roll 1 is 14 m or more and 44 m or less. Moreover, the winding diameter DR of the kitchen towel roll 1 is 110 mm or more and 189 mm or less. When the winding length is less than 14 m, the replacement frequency becomes high, and when the winding length exceeds 44 m, it becomes bulky. If the winding diameter DR is less than 110 mm, the water absorption is inferior, or the winding length becomes short, resulting in high replacement frequency. It is difficult to improve the amount of water absorption in spite of being bulky.

The winding length is preferably 21 m or more and 37 m or less, more preferably 25 m or more and 33 m or less. The winding diameter DR is preferably 130 mm or more and 176 mm or less, more preferably 140 mm or more and 163 mm or less.
For the roll length, the length of 10 sheets of the kitchen towel sheet 1x between the perforations of the kitchen towel roll 1 is actually measured. After that, the number of sheets of the kitchen towel roll 1 is actually measured, and the roll length is obtained 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, then 1.80 m×(150/10)=27 m. If the kitchen towel roll 1 does not have perforations, the roll length can be measured by actual measurement. Further, the winding diameter DR of the roll is measured using a diameter meter rule manufactured by Muratec KDS Co., Ltd. For the measurement, ten kitchen towel rolls 1 are measured and the measurement results are averaged.
The length between perforations (the 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 to this range, when using the kitchen towel roll 1 with good water absorption as in the present application, the area to be used becomes appropriate, and the water absorption amount can be improved.

(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 to this range, when using the kitchen towel roll 1 with good water absorption as in the present application, the area to be used becomes appropriate, and the water absorption amount can be improved.
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 to this range, when using the kitchen towel roll 1 with good water absorption like this application, it is possible to improve the exchange frequency without being bulky.
Note that the roll mass is the mass per roll width of 280 mm that does not include the core (cardboard tube). If the roll width is not 280 mm, it is converted into mass per 280 mm by proportional calculation.

(Roll density and winding 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, and the winding density is preferably 0.22 m/cm ² or more and 0.68 m/cm ² or less. . If the roll density of the kitchen towel roll 1 is less than 0.04 g/cm ³ or the winding density is less than 0.22 m/cm ² , the kitchen towel roll 1 is bulky, but it is difficult to improve the water absorption amount. Moreover, when the roll density of the kitchen towel roll 1 exceeds 0.15 g/cm ³ or the winding density exceeds 0.68 m/cm ² , the paper thickness and specific volume become low, resulting in poor water absorption.
The roll density of the kitchen towel roll 1 is preferably 0.05 g/cm ³ or more and 0.13 g/cm ³ or less, more preferably 0.06 g/cm ³ or more and 0.09 g/cm ³ or less. . 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 still more preferably 0.28 m/cm ² or more and 0.40 m/cm ² or less.

The winding density is represented by (winding length x number of plies)/(cross-sectional area of roll). The cross-sectional area of the roll is expressed by {cross-sectional area of roll outer diameter (winding diameter DR)-(core (paper tube) outer diameter cross-sectional area)}. The core outer diameter DI is the diameter of the central hole of the roll.
For example, if the winding length is 27 m, 2 plies, the winding diameter DR is 150 mm, and the core outer diameter DI is 39 mm, the winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10) ² -3.14 × (39 mm ÷ 2÷10) ² }=0.33 m/cm ² . If the kitchen towel roll 1 does not have a core, the diameter of the center hole is taken as the outer diameter DI of the core.
Further, the roll density is represented by (roll mass)÷(roll volume). The roll mass is the mass of kitchen towel roll 1 per roll width of 280 mm. The roll volume is expressed by [{cross-sectional area of roll outer diameter (winding diameter DR)}-(core outer diameter cross-sectional area)]×roll width (converted to per 280 mm). For example, when the roll mass (excluding the core) per roll width of 280 mm is 382 g, the winding diameter is 150 mm, and the core outer diameter is 39 mm, the roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) ² - 3.14×(39 mm÷2÷10) ² }×(280 mm÷10)]=0.083 g/cm ³ . If the kitchen towel roll 1 does not have a core, the diameter of the central hole is taken as the outer diameter DI of the core.

(basis weight)
The basis weight of the two plies of the kitchen towel sheet 1x is 30 g/m ² or more and 54 g/m ² or less. If the basis weight of the two plies is less than 30 g/m ² , the kitchen towel sheet 1x is inferior in water absorption. If the basis weight exceeds 54 g/m ² , the production cost of the kitchen towel roll 1 will be high. The basis weight of the two plies of the kitchen towel sheet 1x is preferably 34 g/m ² or more and 50 g/m ² or less, more preferably 38 g/m ² or more and 46 g/m ² or less. The basis weight is measured according to JIS P8124.

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, and 16 g/m ² or more and 26 g/m ² or less for both the front surface 1a and the back surface 1b. and more preferably 18 g/m ² or more and 24 g/m ² or less. The grammage per ply is obtained by measuring the grammage of two plies, peeling off the ply, measuring the masses of the front surface 1a and the back surface 1b, and calculating the grammage of the front surface 1a and the back surface 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, which will be described later, the water absorption is likely to be inferior to that of 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 surface 1b is more preferably 0.1 g/m ² or more and 0.8 g/m ² or less higher than the basis weight of the front surface 1a, and is higher by 0.2 g/m ² or more and 0.5 g/m ² or less. is more preferable.

(paper thickness)
Moreover, the paper thickness of the kitchen towel sheet 1x is 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 of the kitchen towel sheet 1x is inferior, and if it exceeds 5 mm/10 sheets, the water absorption is difficult to improve despite the bulkiness. The paper thickness of the kitchen towel sheet 1x is preferably 2.0 mm/10 sheets or more and 4.4 mm/10 sheets or less, and more preferably 2.6 mm/10 sheets or more and 3.8 mm/10 sheets or less. preferable. 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 probe diameter of 30 mm. 5 sets of 2-ply laminated kitchen towel sheets 1x are piled up and measured as 10 sheets. Also, the measurement is repeated 10 times at different points 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. In addition, the kitchen towel sheet 1x in the present invention is laminated into two plies after being embossed on the sheet. When laminating two plies, a ply bond glue (glue) is used, and the glue is applied for bonding. By bonding two plies in this way, the adhesion of the plies is strengthened, and even if the kitchen towel sheet 1x gets wet, the plies do not come off and are less likely to tear.

An embossed pattern is applied to the ply of 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, and the ply peeling of the kitchen towel sheet 1x is less likely to occur, and the water absorption amount is kept within a certain range. can do. The embossed pattern is not particularly limited as long as it is a pattern generally applied to kitchen towels, such as dots or lines, but a linear embossed pattern is preferred. As a linear embossing pattern, specifically, one pattern as shown in FIG. There is no particular limitation as long as the pattern is symmetrical and includes two types of figures each including a combination of a plurality of curves and figures. As for the substantially circular shape of the substantially round shape, it is preferable that the substantially round shape is doubled.
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 a side of 2 cm or more and 25 cm or less, and a square of 5 cm or more and 20 cm or less on a side. is more preferable, and a square with sides of 8 cm or more and 15 cm or less is even more preferable. The vertical direction of the quadrangle E is preferably parallel to the running 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 capacity such as the one of the present application, the water absorption capacity can be improved, and the ply is less likely to peel off, resulting in good wiping performance.

At this time, in the linear embossing pattern, the total length of the embossing having a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more is 50 cm / 100 cm ² or more and 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 embossing length for embossing with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more inside the quadrangle E that includes all one embossed pattern as shown in FIG. is measured as the total length, and the total length per 100 cm ² is taken. The size of one side of the quadrangle E can be appropriately changed according to the size of the embossed pattern. If a square containing all the embossed patterns includes an embossed pattern adjacent to the embossed pattern included in the square, the length of the adjacent embossed pattern is also measured and included in the total length. In addition, when the size of one side of the quadrangle E cannot be clearly determined by the emboss pattern, the size of the quadrangle E is set to 10×10 cm, and the total length of the embossed lengths included in this quadrangle E is measured. By setting the total length within the above range, the kitchen towel sheet 1x having a high water absorption capacity such as the one of the present application can have a good water absorption capacity, and the ply is less likely to peel off and has a good wiping property. The total length is determined by actual measurement using the method described above. In addition, you may measure using a common microscope.

In the emboss pattern, the emboss depth is preferably 0.06 mm or more and 1.1 mm or less. If the depth of the embossing is less than 0.06 mm, the ply will easily peel off in the kitchen towel sheet 1x having a high water absorption capacity such as the present application. If the depth exceeds 1.1 mm, the specific volume of the kitchen towel sheet 1x will be high, and the water absorption amount will be difficult to improve in spite of the bulkiness.
The emboss depth in the emboss pattern is more preferably 0.10 mm or more and 0.80 mm or less, and further preferably 0.20 mm or more and 0.55 mm or less.

The embossing depth is measured using a microscope. As a 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 the observation/measurement/image analysis software for the image of the microscope. The measurement conditions are a magnification of 25 times and a visual field area of 12 mm×9 mm. The measurement magnification and the visual field area may be appropriately changed depending on the size of the desired emboss.

FIG. 3 shows a height profile on the XY plane by a microscope, and the height of the surface of the kitchen towel sheet 1x is represented by shading. The linear portions in FIG. 3 whose shading differs from the surroundings indicate individual embossments. The depth of embossing is obtained by measuring the height difference of the above embossing using the above microscope. In addition, the measurement is performed on the surface 1a side of the kitchen towel sheet 1x. Also, at the time of measurement, the kitchen towel sheet 1x is removed from the kitchen towel roll 1 by 3 turns, and the kitchen towel sheet 1x of the 4th turn is used to measure the state of the 2-ply sheet. Also, if there are perforations, avoid them when measuring.
First, a 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 embossment. In addition, the line segment AB is drawn so as to be in the width direction (CD direction) of the kitchen towel sheet 1x. , the line segment may be drawn diagonally or in the flow direction. The height profile is a (measurement) cross-sectional curve S representing the unevenness of the sample surface of the actual kitchen towel sheet 1x, but there is noise (there is a fiber clump on the surface of the kitchen towel sheet 1x, and the fibers are stretched like whiskers). and sharp peaks caused by portions without fibers), and it is necessary to remove such noise peaks in calculating the height difference of unevenness.

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

Further, the ratio of the depth of embossing in the embossed pattern/the thickness of the entire kitchen towel sheet 1x, which is the ratio of the depth of embossing in the embossing pattern to the thickness of the entire kitchen towel sheet 1x, is 0.02 or more and 0.02. It is preferably 4 or less. If the ratio is less than 0.02, the water absorption per 1 m ² between the two plies of the kitchen towel sheet 1x will be low, the water absorption will be poor as a whole, and the plies will be easily peeled off. When the ratio exceeds 0.4, it becomes difficult to improve the water absorption amount in spite of the bulkiness. The ratio of the depth of embossing in the embossed pattern to the thickness of the entire kitchen towel sheet 1x 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 limitation as to whether or not the ply of 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 different from the embossed pattern. Nested embossing, pin-to-pin embossing, or no embossing is acceptable, but preferably nested embossing or no embossing, more preferably no embossing. Conventional kitchen towels secure water absorption by pin-to-pin or nested type, but when using thick base paper as in this application, embossing causes the paper to collapse as described above. and the amount of water absorption decreases. Therefore, 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 of the portion of the kitchen towel sheet 1x where the embossed pattern is not applied (hereinafter also referred to as the non-embossed portion) is preferably 35 μm or more, and is preferably 50 μm or more and 150 μm. It is more preferably 60 μm or more and 120 μm or less, and particularly preferably 70 μm or more and 90 μm or less. If the root-mean-square height Sq of surface roughness is less than 35 μm, the absorbability is poor. The upper limit of the root-mean-square height Sq of surface roughness is not particularly limited, but if the value is too high, it may become bulky.
The root-mean-square height Sq of the surface roughness of the non-embossed portion is measured using a microscope. Similar to the embossing depth described above, a product name "One-shot 3D measurement macroscope VR-3100" manufactured by KEYENCE can be used as the microscope. The product name "VR-H1A" can be used as the observation/measurement/image analysis software for the image of the microscope. The measurement conditions are a magnification of 38 times and a visual field area of 8 mm×6 mm. The measurement magnification and the visual field area may be appropriately changed depending on the size of the desired embossing.

Similar to the depth of embossment described above, a filter is set for the resulting image shown in FIG. Specifically, by setting the S-filter (low-pass filter), the components of the scale smaller than the cutoff wavelength, and by setting the L-filter (high-pass filter), the components of the scale larger than the cutoff wavelength is removed 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 embossed 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 fourth turn of the kitchen towel sheet 1x. Also, if there are perforations, avoid them when measuring. Measurements were taken at two locations in the width direction of the kitchen towel roll, and then the kitchen towel roll 1 was rotated three times by 90 degrees in the direction of flow of the kitchen towel sheet 1x. ), and the average value of a total of eight locations (2×4) is finally adopted as the root-mean-square height Sq.

(water absorption)
In the present invention, the water absorption amount per 1 m ² of 2 plies of the 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 water absorption amount of the kitchen towel sheet 1x is inferior, and if it exceeds 600 g, the paper thickness of the kitchen towel sheet 1x increases and becomes bulky. The water absorption per m ² is preferably 270 g or more and 550 g or less, more preferably 330 g or more and 480 g or less, and even more preferably 370 g or more and 480 g or less.
Moreover, it is preferable that the water absorption amount per 1 g of 2 plies of the kitchen towel sheet 1x is 6 g or more. If the water absorption amount per 1 g is less than 6 g, the kitchen towel sheet 1x is inferior in water absorption amount. The water absorption 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 water absorption amount 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 100 g, the water absorption amount of the kitchen towel sheet 1x is inferior. It becomes difficult to improve the water absorption. At this time, the water absorption amount per 1 m ² between the two plies is derived from the water absorption amount per 1 m ² of the two plies, and the water absorption amount per 1 m ² of one ply (front surface 1a) and the water absorption amount of one ply (back surface 1b), which will be described later. It is a value obtained by subtracting the amount of water absorbed per 1 m ² .
The water absorption per 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 the kitchen towel sheet 1x is measured as follows.

First, a 2-ply kitchen towel sheet 1x is taken and cut using a 7.6 cm (3 inch) square template to prepare a rectangular test piece with a side of 7.6 cm. The mass of the test piece before water absorption is measured with an electronic balance. A test piece is set in a holder (a jig for fixing three points of the test piece, and the jig is made of metal that does not absorb moisture).
Next, a commercial vat is filled with distilled water to a depth of 2 cm, and the test piece set in the holder is immersed in the distilled water for 2 minutes. After 2 minutes of immersion, the test piece is taken out from the distilled water together with the holder, and a strip 210 is attached to one corner 200d of the test piece 200 as shown in FIG. For the belt 210, cut the same kitchen towel sheet 1x as the sample to be measured into a size of 2 mm in width × 15 mm in length, peel off the ply and use one ply on the back side, from the corner 200d of the test piece 200 toward the center. Stick it on the 6mm part. Next, the holder and the test piece 200 are hung from a rod placed in an empty water tank so that the corner 200a opposite to the corner 200d faces up, and the water tank is closed and left for 10 minutes. After that, 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 with an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, the water absorption amount of distilled water per 1 m ² of the test piece 200 (water g/sheet m ² ) is calculated. Furthermore, by dividing the water absorption amount per 1 m ² (water g/sheet m ² ) by the basis weight of the two plies of the test piece 200, the water absorption amount per 1 m ² (water g/sheet m ² )/basis weight (sheet g/sheet m ² ) = Water absorption per 1 g (water g/sheet g) is calculated. The measurement is performed five times for each sample, and the average value is adopted.
The amount of water absorption of one ply is obtained by cutting the kitchen towel sheet 1x, which is stacked with two plies, using a square template with one piece of 7.6 cm (3 inches) to obtain a rectangular test piece 200 with one side of 7.6 cm. After that, the ply is peeled off, and this is used as a one-ply test piece 200 for water absorption measurement. The measurement method is the same as for 2-ply.
In addition, this measurement is performed at a temperature of 23±1° C. and a humidity of 50±2% according to the JIS P 8111 method. Distilled water is kept at 23±1°C.

In the present invention, the water absorption per 1 m ² of one ply (surface 1a) of the 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. is more preferable. On the other hand, the water absorption amount per 1 m ² of one ply (back surface 1b) of the kitchen towel sheet 1x 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. is more preferred.
In addition, the water absorption amount per 1 g of 1 ply (surface 1a) of the 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. 0 g or less is more preferable. On the other hand, the water absorption amount per 1 g of 1 ply (back surface 1b) of the kitchen towel sheet 1x is preferably 3.1 g or more, more preferably 3.6 g or more and 7.1 g or less, and 4.1 g. It is more preferable that it is more than or equal to 6.1 g or less.

(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, is preferably 25 mm or more and 55 mm or less, more preferably 30 mm or more and 50 mm or less, and 35 mm or more and 45 mm or less. is more preferred. When the core outer diameter DI is within the above range, the kitchen towel roll 1 can be easily accommodated in the kitchen towel holder because the winding density of the kitchen towel roll 1 is preferably maintained and the kitchen towel roll 1 is not bulky. Therefore, the handleability of the kitchen towel roll 1 during manufacturing is also improved.
The outer diameter of the core was measured using a diameter meter rule manufactured by Muratec KDS Co., Ltd. Ten 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.

(specific volume)
The specific volume of the kitchen towel sheet 1x is preferably 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 absorption of the kitchen towel sheet 1x is poor, and if it exceeds 22 cm ³ /g, the water absorption is difficult to improve despite the bulkiness. The specific volume is more preferably 9 cm ³ /g or more and 20 cm ³ /g or less, and even more preferably 12 cm ³ /g or more and 17 cm ³ /g or less. The specific volume is obtained by dividing the paper thickness per 2 plies of the kitchen towel sheet 1x by the basis weight per 2 plies, and is expressed in volume cm ³ per unit g.

(DMDT and DCDT)
The dry machine direction tensile strength DMDT (Dry Machine Direction Tensile Strength) of the 2-ply kitchen towel sheet 1x based on JIS P 8113 is preferably 4.5 N/25 mm or more and 21 N/25 mm or less, and The dry cross direction tensile strength DCDT (Dry Cross Direction Tensile Strength) is preferably 4.5 N/25 mm or more and 21 N/25 mm or less. If the DMDT or DCDT is less than 4.5 N/25 mm, the kitchen towel sheet 1x having a high water absorption capacity as in the present application is likely to tear when absorbing water, and the DMDT or DCDT exceeds 21 N/25 mm. In both cases, the density of the kitchen towel sheet 1x is increased and the water absorbency is poor.
DMDT is more preferably 6.0 N/25 mm or more and 17.0 N/25 mm or less, and further preferably 7.5 N/25 mm or more and 12.0 N/25 mm or less. 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.
In addition, 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. is more preferable.

(WMDT and WCDT)
In addition, the wet machine direction tensile strength WMDT (Wet Machine Direction Tensile Strength) of 2 plies of the kitchen towel sheet 1x when wet based on old JIS S 3104 is 1.5 N / 25 mm or more and 8.0 N / 25 mm or less. and a Wet Cross Direction Tensile Strength (WCDT) of 1.5 N/25 mm or more and 8.0 N/25 mm or less. If the WMDT or WCDT is less than 1.5 N/25 mm, the kitchen towel sheet 1x having a high water absorption capacity such as the one of the present application tends to tear when absorbing water, and the WMDT or WCDT is 8.0 N/25 mm. , the density of the kitchen towel sheet 1x will be high and the water absorption will be poor.
WMDT is more preferably 2.0 N/25 mm or more and 6.0 N/25 mm or less, and further preferably 2.5 N/25 mm or more and 4.5 N/25 mm or less. Further, 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. is more preferable.

(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. When the ply peel strength is less than 0.04 N/75 mm, the plies are peeled off from each other, making it difficult to wipe off.
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 further preferably 0.15 N/75 mm or more and 0.6 N/75 mm or less.
The ply peel strength can be measured using a tensile tester (STB-1225S, manufactured by A&D Co., Ltd.) according to the tensile test method of JIS P 8113, and is specified in JIS P 8111. under standard conditions. First, a test piece having a width of 75 mm and a flow direction of 200 mm 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 clamped to the upper gripper (width 75 mm) by 15 mm in the machine direction. In addition, the other ply is also fixed by sandwiching 15 mm in the flow direction between the grips (75 mm wide) on the lower side. The pitch (interval) of the grips is set to 20 mm. Next, it is pulled (peeled) at a tensile speed of 100 mm/min, and strength data is collected. Data is obtained every 20 μm, and the average of the data from the distance of 40 mm to 150 mm (measurement length: 110 mm) after the start of measurement is taken as the peel strength (N/75 mm). However, if the perforation is included in the distance from 40 mm to 150 mm after the start of measurement, the distance after the start of measurement should be shortened, such as from 40 mm to 90 mm (measurement length: 50 mm), within the range that does not include the perforation. can be done.

(Manufacturing method of kitchen towel sheet and kitchen towel roll)
The kitchen towel sheet 1x and the kitchen towel roll 1 can be manufactured, for example, in the order of (1) paper making and creping, (2) embossing, and (3) roll winding. Through air dryer technology is preferably used in the manufacturing process. At this time, in the papermaking process, an uneven pattern derived from the papermaking process (fabric) different from the embossed pattern described above is applied to the kitchen towel sheet 1x. By having this concave-convex pattern, the water absorption capacity of the kitchen towel sheet 1x is further increased. In addition, the origin of the papermaking process means that it is applied between the headbox of the paper machine and the entrance of the Yankee dryer in the papermaking process of the kitchen towel sheet 1x, especially in the through air dryer section where the sheet is dried together with the fabric. As a result, unevenness is formed.
Also, the uneven pattern can be changed as appropriate by changing the fabric pattern (fine pattern, rough pattern). Although the specific volume (paper thickness) changes when the uneven pattern is changed, it is preferable to select such a pattern that the specific volume (paper thickness) of the base paper is within the numerical range described later. Moreover, 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 is within the numerical range described above.

When using the base paper made using this through-air dryer, the area ratio of the projections on the embossing roll for applying the embossed pattern is preferably 4% or more and 40% or less. If the area ratio is less than 4%, the plies are likely to separate from each other in the kitchen towel sheet 1x having good water absorbency as in the present application. When the area ratio exceeds 40%, the paper of the kitchen towel sheet 1x is crushed, resulting in poor water absorption.
The area ratio of the convex portion is more preferably 6% or more and 30% or less, and further preferably 9% or more and 18% or less. Moreover, the shape of the convex portion and the embossing alone can be circular, elliptical, rectangular, square, floral, logo, letter, etc. without any particular limitation, but linear embossing is preferable as described above. 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 2 plies of the base paper used for manufacturing the kitchen towel sheet 1x (twice the basis weight of 1 ply) 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 m ² or more and 54 g/m ² or less, and even more preferably 39 g/m ² or more and 50 g/m ² or less. In addition, 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/ More preferably, it is 10 sheets or more and 4.2 mm/10 sheets or less. Further, 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. is more preferred.

The ratio of the depth of embossing in the embossed pattern to the thickness of the base paper of the kitchen towel sheet 1x, which is the ratio of the depth of embossing in the embossed pattern/the 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 the thickness in this range, in the case of the kitchen towel sheet 1x having good water absorbency as in the present application, the ply is not bulky and the ply is not easily peeled off, and the water absorbency can be improved.
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 and the specific volume of the base paper) is not bulky, does not easily peel off the ply, and improves water absorption. -3 cm ³ /g or more and 2 cm ³ /g or less is preferable, -2 cm ³ /g or more and 1 cm ³ /g or less is more preferable, -1 cm ³ /g or more and 0.5 cm ³ /g or less is further preferable, -0.5 cm ³ /g or more and 0 cm ³ /g or less is particularly preferable.

It is needless to say that the present invention is not limited to the embodiments described above, but extends to various modifications and equivalents within the spirit and scope of the present invention.

Through the steps of (1) papermaking and creping, (2) embossing, and (3) roll winding, the kitchen towel sheets and kitchen towel rolls of Examples 1 to 27 and Comparative Examples 1 to 12 are manufactured. did. In addition, one type of commercially available kitchen towel sheet and kitchen towel roll was prepared. Each of the above parameters was measured and evaluated for all the above Examples, Comparative Examples, and commercial kitchen towel rolls.
As for the embossed pattern, the number and thickness were appropriately changed in each example and each comparative example, and all the embossments were provided only on the front side of the kitchen towel sheet. Specifically, in Comparative Examples 7 to 18, the number of embossed lines was increased, and in Example 19 to Comparative Example 8, the number of embossed lines was not increased and the thickness of the embossed lines was increased.
For roll widths other than 280 mm, including commercial product 1, the mass of the rolls is described in terms of a roll width of 280 mm.

The following items were evaluated for the manufactured kitchen towel sheet and kitchen towel roll.
Basis weight: The basis weight of two plies of the kitchen towel sheet was actually measured and evaluated as follows.
Exceeding 61 g/ ^m2 : 1 point exceeding 54 g/ ^m2 and 61 g/ ^m2 or less: ² points exceeding 50 g/m2 and 54 g/ ^m2 or less: 3 points exceeding 46 g/ ^m2 and 50 g/ ^m2 Below: 4 points
46g/ ^m2 or less: 5 points

Water Absorption: The amount of water absorption (water g/sheet m ² ) in 1 m ² of a 2-ply sheet was measured by the method described above, and evaluated as follows.
Less than 170 (water g/sheet m ² ): 1 point 170 (water g/sheet m ² ) or more and less than 220 (water g/sheet m ² ): 2 points 220 (water g/sheet m ² ) or more 270 (water g / sheet m ² ): 3 points 270 (water g/sheet m ² ) or more and less than 330 (water g/sheet m ² ): 4 points 330 (water g/sheet m ² ) or more 370 (water g/sheet m ² ) ) or less: 5 points
370 (water g/sheet m ² ) or more: 6 points

Not bulky: The paper thickness and roll diameter were measured by the methods described above, and evaluated as shown in Table 1 below.

Replacement frequency: The roll length was measured and evaluated as follows.
Less than 10m: 1 point 10m or more and less than 14m: 2 points 14m or more and less than 21m: 3 points 21m or more and less than 25m: 4 points 25m or more: 5 points

Wipeability (difficulty in peeling ply): The peel strength of the ply was measured and evaluated as follows.
Less than 0.01 N/75 mm: 1 point 0.01 N/75 mm or more and less than 0.04 N/75 mm: 2 points 0.04 N/75 mm or more and less than 0.10 N/75 mm: 3 points 0.10 N/75 mm or more 0.15 N/75 mm Less than: 4 points
0.15N/75mm or more: 5 points

The results obtained are shown in Tables 2-4.

As described above, the kitchen towel roll of the present invention has good water absorption, is not bulky, does not peel off the ply, and has a low replacement frequency even under the condition that the basis weight is kept within a certain range without being excessively high. I understand.

1 kitchen towel roll 1a front surface 1b back surface 1e edge of outermost roll of kitchen towel sheet 1x kitchen towel sheet 200 test piece 200a, 200d corner 210 band 220 holder

Claims (12)

A kitchen towel roll obtained by bonding a sheet with an embossed pattern with glue and winding a kitchen towel sheet laminated into two plies into a roll,
The kitchen towel sheet has an uneven pattern derived from a papermaking process different from the embossed pattern,
The 2-ply basis weight is 30 g/m ² or more and 54 g/m ² or less, and the paper thickness is 1.3 mm/10 sheets or more and 5 mm/10 sheets or less,
The water absorption amount per 1 m ² of 2 plies is 220 g or more and 600 g or less,
A kitchen towel roll characterized by having a roll length of 14 m or more and 44 m or less and a roll diameter of 110 mm or more and 189 mm or less. 2. The kitchen towel roll according to claim 1, wherein the water absorption amount per 1 g of the two plies of the kitchen towel sheet is 6 g or more. 3. The kitchen towel roll according to claim 1 or 2, wherein the water absorption per square meter between the ^two plies of the kitchen towel sheet is 100 g or more and 300 g or less. The kitchen towel roll according to any one of claims 1 to 3, wherein the depth of embossing in the embossed pattern is 0.06 mm or more and 1.1 mm or less. 5. The embossing pattern according to any one of claims 1 to 4, wherein the ratio of the depth of embossing/thickness of the entire kitchen towel sheet is 0.02 or more and 0.4 or less. kitchen towel roll. The kitchen towel roll according to any one of claims 1 to 5, characterized in that the roll density of the kitchen towel roll is 0.04 g/ ^cm3 or more and 0.15 g/ ^cm3 or less. The kitchen towel roll according to any one of claims 1 to 6, wherein the kitchen towel roll has a winding density of 0.22 m/ ^cm2 or more and 0.68 m/ ^cm2 or less. 8. The kitchen towel roll according to any one of claims 1 to 7, wherein the embossing roll for applying the embossed pattern has a convex area ratio of 4% or more and 40% or less. 9. Kitchen towel roll according to any one of the preceding claims, characterized in that the embossed pattern is linear. In the linear embossing pattern, the embossing having a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more has a total length of 50 cm/100 cm ² or more and 550 cm/100 cm ² when the embossing length is added. 10. Kitchen towel roll according to claim 9, characterized in that: 11. The kitchen towel sheet according to any one of claims 1 to 10, wherein the root-mean-square height of the surface roughness of the portion not provided with the embossed pattern is 35 μm or more. kitchen towel roll. 12. Kitchen towel roll according to any one of the preceding claims, characterized in that the kitchen towel sheet has no embossments on the back side.

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