Kitchen towel roll

Abstract

To provide a kitchen towel roll having favorable water absorption, no bulkiness, no ply peeling, and less frequent replacement even under conditions where the basis weight is within a certain range without being excessively high.SOLUTION: A kitchen towel roll is formed by rolling kitchen towel sheets into a roll, the kitchen towel sheets with embossed patterns applied thereto, glued together and laminated into two plies, where the kitchen towel sheets include concavo-convex patterns different from the embossed patterns, derived from a papermaking process. The kitchen towel roll is characterized in that the basis weight of the two plies is 30 g / m2 or more and 54 g / m2 or less, the paper thickness is 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less, the water absorption amount per m2 of the two plies is 220 g or more an 600 g or less, the wound length of the kitchen towel roll is 14 m or more and 44 m or less and the wound diameter is 110 mm or more and 189 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, various types of kitchen towels have been developed. Water and oil absorption are crucial for kitchen towels, and papermaking technologies have been developed to increase these absorption levels. Furthermore, technologies have been developed to reduce paper thickness through embossing patterns.

[0003] For example, Patent Document 1 describes a material mainly composed of pulp, consisting of one or more sheets stacked together, with a basis weight of 15 to 50 g / m² per set. 2 Furthermore, the oil absorption / basis weight is 4.5 to 7.5 OIL-g / g, and when the length of the measurement field of view is set to 1.0 to 1.4 mm in the area avoiding the mechanically embossed part performed in a process other than the paper machine, the height difference of the surface irregularities is 100 to 600 μm, and the area ratio of the recesses on the surface, measured under conditions of a scan area of ​​10 cm × 10 cm, is 2 to 12%, and a kitchen towel made by applying dry crepe and a method for manufacturing the same are disclosed. Furthermore, Patent Document 2 discloses a embossing layer for an embossing belt used to create an uneven surface on a wet fibrous web by pressing it in the press section of a tissue papermaking machine for manufacturing high bulk tissue paper, wherein the embossing layer is nonwoven and has a web transport side with a surface that cooperates with the fibrous web, and the surface has depressions or raised parts that form a three-dimensional structure on its surface, a press section and papermaking machine for manufacturing high bulk crepe tissue paper web, and a method for manufacturing the same. Furthermore, Patent Document 3 discloses a method for manufacturing a roll-shaped paper product, comprising the steps of: preparing at least one paper web; and embossing at least one web using an embossed pattern that covers at least about 22% of the total surface area of ​​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, characterized in that the roll-shaped paper product and the method for manufacturing the same. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 5373208 [Patent Document 2] Special Publication No. 2011-506780 [Patent Document 3] Special Publication No. 2016-540530 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, the amount of water absorbed also varied depending on the embossing pattern, and it was difficult to achieve good water absorption using only the papermaking techniques described above. In particular, when using thick base paper obtained with the papermaking techniques described above, it was found that if embossing was applied in the same way as with normal base paper, the embossed areas of the paper would collapse, reducing the amount of water absorbed. In other words, while it is common practice to increase the bulk of a normal base paper by adding embossing, it was found that it is difficult to achieve good water absorption using the general approach to embossing when using papermaking techniques that increase the bulk of the base paper.

[0006] Therefore, if the embossed area is reduced, the plies will peel off when absorbing water, causing the paper to tear or resulting in poor wiping performance. In other words, unlike with ordinary towel paper, using the paper base paper produced by the above papermaking technology results in a higher water absorption rate, which can cause the plies to peel off or the paper to tear easily. Furthermore, as shown in Patent Document 3, when using a pattern that reduces paper thickness through embossing, the amount of water absorbed may decrease. Of course, increasing the basis weight improves the amount of water absorbed, but it also increases the cost.

[0007] Therefore, the present invention has been made in view of the above problems, and aims to provide a kitchen towel roll that has good water absorption, is not bulky, does not peel off the ply, and requires infrequent replacement, even under conditions where the basis weight is kept within a certain range without being excessively high. [Means for solving the problem]

[0008] The inventors of this invention conducted diligent research to solve the above problems. As a result, they found that the above problems could be solved by applying a different uneven pattern than the embossed pattern, and by adjusting the basis weight, paper thickness, and water absorption capacity of the kitchen towel sheet, as well as the roll length and roll diameter of the kitchen towel roll, and thus completed the present invention. Specifically, the present invention provides the following.

[0009] (1) A first aspect of the present invention is a kitchen towel roll obtained by bonding sheets with an embossed pattern with glue and laminating them into two plies, wherein the kitchen towel sheet has a pattern of irregularities derived from a papermaking process different from the embossed pattern, and the basis weight of the two plies is 30 g / m². 2 More than 54g / m 2 The following applies to paper with a thickness of 1.3mm / 10 sheets or more and 5mm / 10 sheets or less, and is 2-ply, 1m long. 2 This kitchen towel roll is characterized by having a water absorption capacity of 220g or more and 600g or less per unit, a roll length of 14m or more and 44m or less, and a roll diameter of 110mm or more and 189mm or less.

[0010] (2) A second aspect of the present invention is a kitchen towel roll as described in (1), characterized in that the water absorption capacity per gram of the two-ply kitchen towel sheet is 6g or more.

[0011] (3) The 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 two plies of the kitchen towel sheet is 100 g or more and 300 g or less.

[0012] (4) The fourth aspect of the present invention is the kitchen towel roll according to any one of (1) to (3), wherein the depth of the emboss in the emboss pattern is 0.06 mm or more and 1.1 mm or less.

[0013] (5) The fifth aspect of the present invention is the kitchen towel roll according to any one of (1) to (4), wherein the ratio of the depth of the emboss in the emboss pattern to the paper thickness of the entire kitchen towel sheet is 0.02 or more and 0.4 or less.

[0014] (6) The sixth aspect of the present invention is the kitchen towel roll according to any one of (1) to (5), wherein the roll density of the kitchen towel roll is 0.04 g / cm 3 or more and 0.15 g / cm 3 or less.

[0015] (7) The seventh aspect of the present invention is the kitchen towel roll according to any one of (1) to (6), wherein the winding density of the kitchen towel roll is 0.22 m / cm 2 or more and 0.68 m / cm 2 or less.

[0016] (8) The eighth aspect of the present invention is the kitchen towel roll according to any one of (1) to (7), wherein the area ratio of the convex portion in the emboss roll for applying the emboss pattern is 4% or more and 40% or less.

[0017] (9) The ninth aspect of the present invention is the kitchen towel roll according to any one of (1) to (8), wherein the emboss pattern is linear.

[0018] (10) A tenth aspect of the present invention is a kitchen towel roll as described in (9), wherein the linear embossed pattern has a thickness of 0.1 mm or more and a length of 5 mm or more, and the total length when the lengths of the embossed areas are added together is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 It is characterized by the following:

[0019] (11) An eleventh aspect of the present invention is a kitchen towel roll according to any one of (1) to (10), characterized in that the root mean square height of the surface roughness in the portion of the kitchen towel sheet that does not have the embossed pattern is 35 μm or more.

[0020] (12) A twelfth aspect of the present invention is a kitchen towel roll according to any one of (1) to (11), characterized in that the kitchen towel sheet does not have an embossed surface on its back. [Effects of the Invention]

[0021] Therefore, according to the present invention, even under conditions where the basis weight is kept within a certain range without being excessively high, it is possible to provide a kitchen towel roll that has good water absorption, is not bulky, does not peel off the ply, and requires less frequent replacement. [Brief explanation of the drawing]

[0022] [Figure 1] This is a perspective view showing the appearance of the kitchen towel roll of the present invention. [Figure 2] This figure shows an example of an embossed pattern in the kitchen towel roll of the present invention. [Figure 3] This figure shows the height profile on the XY plane as measured by a microscope, indicated by varying shades of gray. [Figure 4] This figure shows the height profile on the XY plane as measured by a microscope. [Figure 5]This diagram shows how to determine the depth of an embossed pattern. [Figure 6] This figure shows the height profile of the non-embossed area on the XY plane, as measured by a microscope, using shades of gray. [Figure 7] This figure shows the method for measuring the water absorption capacity of a kitchen towel roll according to the present invention. [Modes for carrying out the invention]

[0023] The embodiments of the present invention will be described in detail below, but these embodiments are presented for illustrative purposes only, and the present invention is not limited in any way to the embodiments shown below.

[0024] <Kitchen towel roll> Figure 1 is a perspective view showing the appearance of the 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 two layers of kitchen towel sheets 1x, each with an embossed pattern, are bonded together with glue and then wound into a roll. Preferably, the kitchen towel sheets 1x have perforations in the width direction at equal intervals in the flow direction.

[0025] Furthermore, as shown in Figure 1, of the surfaces of the kitchen towel sheet 1x, the surface facing outwards from the roll is referred to as surface 1a (the surface of the kitchen towel sheet 1x), and the surface facing towards the center of the roll is referred to as back surface 1b (the back surface of the kitchen towel sheet 1x).

[0026] (Roll length and roll diameter) The length of kitchen towel roll 1 is between 14m and 44m. The diameter DR of kitchen towel roll 1 is between 110mm and 189mm. If the length is less than 14m, the replacement frequency increases; if the length exceeds 44m, it becomes bulky. If the diameter DR is less than 110mm, the water absorption is inferior, and the shorter length increases the replacement frequency; if the diameter DR exceeds 189mm, it becomes bulky, the roll density decreases, and the water absorption does not improve despite the bulkiness.

[0027] The winding length is preferably 21m to 37m, and more preferably 25m to 33m. The winding diameter DR is preferably 130mm to 176mm, and more preferably 140mm to 163mm. The roll length is determined by measuring the length of 10 sheets of kitchen towels between the perforations of kitchen towel roll 1. Then, the number of sheets in kitchen towel roll 1 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80m and the number of sheets is 150, then 1.80m × (150 / 10) = 27m. If kitchen towel roll 1 does not have perforations, the roll length can be measured by hand. The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring 10 kitchen towel rolls 1 and averaging the results. Furthermore, the length between perforations (length of the sheet in the flow direction) is preferably 100 mm to 270 mm, more preferably 125 mm to 240 mm, and even more preferably 150 mm to 210 mm. By keeping it within this range, when using a kitchen towel roll 1 with good water absorption like the present invention, the area used becomes appropriate, and the amount of water absorbed can be improved.

[0028] (Roll width and roll mass) The roll width of the kitchen towel roll 1 is preferably 150 mm to 380 mm, more preferably 200 mm to 340 mm, and even more preferably 250 mm to 300 mm. By keeping the width within this range, when using a kitchen towel roll 1 with good water absorption like the one in this invention, the area used becomes appropriate, and the amount of water absorbed can be improved. Furthermore, the roll weight of the kitchen towel roll 1 is preferably 160g or more and 550g or less, more preferably 230g or more and 450g or less, and even more preferably 270g or more and 380g or less. By keeping it within this range, when using a kitchen towel roll 1 with good water absorption like the one in this invention, it is possible to replace it frequently without it becoming bulky. Note that the roll mass is the mass per 280 mm of roll width, excluding the core (paper tube). If the roll width is not 280 mm, the mass per 280 mm will be converted using proportional calculation.

[0029] (Roll density and winding density) The roll density of kitchen towel roll 1 is 0.04 g / cm². 3 More than 0.15g / cm 3 Preferably, the following conditions apply, with a winding density of 0.22 m / cm². 2 More than 0.68m / cm 2 Preferably, the roll density of kitchen towel roll 1 is 0.04 g / cm². 3 It is less than or the winding density is 0.22 m / cm². 2 If the density is less than 0.15 g / cm³, the kitchen towel roll 1 will be bulky while its absorbency will not improve significantly. 3 If it exceeds or the winding density is 0.68 m / cm² 2 Beyond a certain point, the paper thickness and specific volume decrease, resulting in inferior water absorption. The roll density of Kitchen Towel Roll 1 is 0.05 g / cm². 3 More than 0.13g / cm 3 Preferably, it is 0.06 g / cm³. 3 More than 0.09g / cm 3 The following is more preferable: The winding density of kitchen towel roll 1 is 0.25 m / cm². 2 More than 0.54m / cm 2 It is more preferable that the following is true: 0.28 m / cm 2 More than 0.40m / cm 2 The following is even more preferable:

[0030] Winding density is expressed as (winding length × number of plies) ÷ (roll cross-sectional area). The roll cross-sectional area is expressed as {cross-sectional area of ​​the roll's outer diameter (winding diameter DR) portion - (cross-sectional area of ​​the core (paper tube) outer diameter portion)}. The core outer diameter DI is the diameter of the central hole of the roll. For example, if the winding length is 27m, it is 2-ply, the winding diameter DR is 150mm, and the core outer diameter DI is 39mm, then the winding density = (27m × 2) ÷ {3.14 × (150mm ÷ 2 ÷ 10)} 2 -3.14 × (39mm ÷ 2 ÷ 10) 2} = 0.33 m / cm 2 This is the result. If kitchen towel roll 1 does not have a core, the diameter of the central hole is defined as the core outer diameter DI. Furthermore, roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of one kitchen towel roll per 280 mm roll width. Roll volume is expressed as [{cross-sectional area of ​​the outer diameter (winding diameter DR) portion of the roll} - (cross-sectional area of ​​the outer diameter portion of the core)] × roll width (converted to per 280 mm). For example, if the roll mass (excluding core) per 280 mm roll width is 382 g, the winding diameter is 150 mm, and the outer diameter of the core is 39 mm, then roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14 × (39mm ÷ 2 ÷ 10) 2} × (280 mm ÷ 10) = 0.083 g / cm³ 3 This is the result. Note that if kitchen towel roll 1 does not have a core, the diameter of the central hole will be considered the core outer diameter DI.

[0031] (Basic weight) The basis weight of a 1x 2-ply kitchen towel sheet is 30g / m². 2 More than 54g / m 2 The following applies: The basis weight of the 2-ply is 30 g / m². 2 If the basis weight is less than 54 g / m², the water absorption capacity will be inferior to that of a single kitchen towel sheet. 2 If it exceeds this, the production cost of one kitchen towel roll will increase. The basis weight of one 2-ply kitchen towel sheet is 34 g / m². 2 More than 50g / m 2 Preferably, it is 38 g / m 2 More than 46g / m 2The following is more preferable: Basis weight shall be measured according to JIS P 8124.

[0032] Furthermore, the basis weight per ply of the kitchen towel sheet 1x is 14g / m² for both the front surface 1a and the back surface 1b. 2 More than 28g / m 2 Preferably, it is 16 g / m 2 More than 26g / m 2 It is more preferable that the following conditions apply: 18 g / m 2 More than 24g / m 2 The following is even more preferable: The basis weight per ply is calculated by first measuring the basis weight of two plies, then separating the plies, measuring the mass of surface 1a and back surface 1b, and calculating the basis weight of surface 1a and back surface 1b from the mass ratio. Furthermore, in the kitchen towel sheet 1x, the basis weight of the back surface 1b is 0.1 g / m² higher than the basis weight of the front surface 1a. 2 More than 1g / m 2 The following values ​​are preferable. Surface 1a has an embossed pattern, which will be described later, and therefore tends to have lower water absorption than back surface 1b. By increasing the basis weight of back surface 1b, the water absorption of back surface 1b can be increased, thereby increasing the overall water absorption. Note that the basis weight of back surface 1b should be 0.1 g / m² higher than the basis weight of surface 1a. 2 More than 0.8g / m 2 The following higher values ​​are preferable: 0.2 g / m 2 More than 0.5g / m 2 The higher the value, the better.

[0033] (paper thickness) Furthermore, the paper thickness of a kitchen towel sheet 1x is between 1.3 mm / 10 sheets and 5 mm / 10 sheets. If the paper thickness is less than 1.3 mm / 10 sheets, the water absorption capacity of the kitchen towel sheet 1x will be inferior, and if it exceeds 5 mm / 10 sheets, the water absorption capacity will not improve significantly despite the bulkiness. Preferably, the paper thickness of a kitchen towel sheet 1x is between 2.0 mm / 10 sheets and 4.4 mm / 10 sheets, and more preferably between 2.6 mm / 10 sheets and 3.8 mm / 10 sheets. The paper thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measuring load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring stand, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. Five sets of 2-ply laminated kitchen towel sheets 1x are stacked and measured as 10 sheets. Furthermore, the measurement is repeated 10 times at different locations, and the measurement results are averaged.

[0034] (Embossed pattern) The kitchen towel roll 1 (kitchen towel sheet 1x) of the present invention is embossed and has an embossed pattern. Furthermore, the kitchen towel sheet 1x in the present invention is laminated into a 2-ply form after the embossing process is completed. When laminating the 2-ply form, a ply bond glue (adhesive) is used, and the glue is applied to bond the sheets together. By bonding the sheets together in this way to create a 2-ply form, the adhesion between the plies is strengthened, and the kitchen towel sheet 1x becomes less likely to tear and the plies will not separate even when wet.

[0035] The surface 1a of the kitchen towel sheet 1x has an embossed pattern on the ply. The embossed pattern on the surface 1a allows glue to be applied to the embossed parts of the embossed pattern for adhesion, making it less likely for the ply of the kitchen towel sheet 1x to peel off and allowing the amount of water absorbed to be kept within a certain range. The embossed pattern is not particularly limited as long as it is a pattern that is commonly applied to kitchen towels, such as dots or lines, but a linear embossed pattern is preferred. Specifically, the linear embossed pattern is not particularly limited as long as one pattern contains two of two types of figures, such as the approximately circular shape with another pattern inside, and a figure that is approximately symmetrical vertically and horizontally and includes a combination of multiple curves and figures, as shown in Figure 2. In the case of the approximately circular shape, it is preferable that the approximately circular shape is doubled. Furthermore, regarding the dimensions of the embossed pattern, it is preferable that the rectangle E (E is not the embossed pattern) surrounding the embossed pattern is a square with sides of 2 cm to 25 cm, more preferably a square with sides of 5 cm to 20 cm, and even more preferably a square with sides of 8 cm to 15 cm. For this rectangle E, it is preferable that the vertical direction is parallel to the flow direction of the kitchen towel roll 1 and the horizontal direction is parallel to the width direction of the kitchen towel roll 1, but it may also be tilted. By using such a pattern, the water absorption capacity can be improved in a kitchen towel sheet 1x with high water absorption capacity like the present invention, the ply is less likely to peel off, and the wiping performance is improved.

[0036] In this case, for linear embossed patterns, if the thickness is 0.1 mm or more and the length is 5 mm or more, the total length when the lengths of the embossed areas are added together is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 Preferably, the following: 80cm / 100cm 2 More than 410cm / 100cm 2 The following is more preferable: 110cm / 100cm 2 More than 300cm / 100cm 2The following is even more preferable: The total length described above was measured by adding up the lengths of the embossed areas within a rectangle E that encompasses the entire embossed pattern as shown in Figure 2, where the thickness is between 0.1 mm and 4 mm and the length is 5 mm or more. The sum of these lengths is then measured as the total length, up to 100 cm. 2 This is the total length of the area. The size of one side of this rectangle E can be appropriately changed depending on the size of the embossed pattern. If an embossed pattern adjacent to an embossed pattern contained within a rectangle that includes all of the embossed patterns, the length of that adjacent embossed pattern is also measured and included in the total length. If the size of one side of rectangle E cannot be clearly determined by the embossed pattern, the size of rectangle E is set to 10 × 10 cm, and the total length of the embossed pattern contained within this rectangle is measured. By setting the total length within the above range, the water absorption capacity can be improved in a highly absorbent kitchen towel sheet 1x like the one in this application, the ply is less likely to peel off, and the wiping performance is improved. The total length is determined by actual measurement using the method described above. Alternatively, it may be measured using a general microscope.

[0037] In the embossed pattern, the embossing depth is preferably 0.06 mm or more and 1.1 mm or less. If the embossing depth is less than 0.06 mm, the ply will easily peel off in a kitchen towel sheet 1x with high water absorption like the one in this application. If the depth exceeds 1.1 mm, the specific volume of the kitchen towel sheet 1x will increase, making it bulky and making it difficult to improve water absorption. Furthermore, the depth of the embossing in the embossed 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.

[0038] The depth of the embossing is measured using a microscope. The KEYENCE VR-3100 One-Shot 3D Measurement Macroscope can be used. The VR-H1A software can be used for observing, measuring, and analyzing the microscope images. The measurement conditions are 25x magnification and a field of view of 12mm x 9mm. The magnification and field of view may be adjusted as needed depending on the desired embossing size.

[0039] Figure 3 shows the height profile on the XY plane obtained by a microscope, with the height of the surface of the kitchen towel sheet 1x represented by shades of gray. Linear areas in Figure 3 with different shades from the surrounding areas indicate individual embossing. The depth of the embossing is determined by measuring the height difference of the embossing using the microscope described above. The measurement is performed on the surface 1a side of the kitchen towel sheet 1x. In addition, three turns of kitchen towel sheet 1x are removed from the kitchen towel roll 1, and the measurement is taken using the fourth turn of kitchen towel sheet 1x in a 2-ply sheet state. If there are perforations, they are avoided during measurement. First, draw line segment AB as shown in Figure 3 to obtain the height profile in Figure 4. Note that line segment AB should be drawn across the embossing. Line segment AB should be drawn in the width direction (CD direction) of the kitchen towel sheet 1x, but if the spacing between embossings is narrow, for example, 2 mm or less, and the height of the raised parts below becomes low, the line segment may be drawn diagonally or in the direction of the flow. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual surface of the kitchen towel sheet 1x sample, but it also contains noise (steep peaks caused by fiber clumps on the surface of the kitchen towel sheet 1x, fibers extending in a whisker-like manner, or areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness.

[0040] Therefore, the (measured) cross-sectional curve S in Figure 4 is smoothed with a weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 5. Note that smoothing using the weighted average radio button filter can be obtained automatically using the analysis software mentioned above. Then, in the graph shown in Figure 5, the average of the maximum values ​​on the vertical axis of the convex part H1 and the convex part H2 adjacent to convex part H1 is calculated, and the minimum value on the vertical axis at the concave part D1 sandwiched between convex parts H1 and H2 is found. The value obtained by subtracting the minimum value from the average of the maximum values ​​obtained in this way is taken as the provisional embossing depth. Then, as shown in Figure 5, the same measurement is performed at a total of two consecutive locations on the cross-sectional curve (a total of two consecutive locations: the concave part D1 and the concave part D2 sandwiched between convex parts H3 and H4) (at this point, two measurement results are obtained). Subsequently, the kitchen towel roll 1 is rotated 90 degrees three times in the flow direction of the kitchen towel sheet 1x, and the same measurements as above are taken at each position (a total of 4 measurement positions in the flow direction). The average value of these 8 positions (2 x 4) is then adopted as the embossing depth. Furthermore, since the kitchen towel sheet 1x of the present invention has a pattern of irregularities derived from the papermaking process, which differs from the embossed pattern, variations in the height of the convex parts on either side of the recess are observed. Therefore, if the difference in the vertical axis values ​​between the convex parts flanking the recess (for example, convex parts H3 and H4 flanking the recess D2) is 0.2 mm or more, measurements should be taken at locations that avoid that area.

[0041] Furthermore, it is preferable that the ratio of the depth of the embossing in the embossing pattern to the total paper thickness of the kitchen towel sheet 1x, i.e., the ratio of the depth of the embossing in the embossing pattern to the total paper thickness of the kitchen towel sheet 1x, is between 0.02 and 0.4. If the ratio is less than 0.02, the 1m between the two plies of the kitchen towel sheet 1x will be less. 2The amount of water absorbed per unit area decreases, resulting in inferior overall water absorption and making the ply more prone to peeling. When the ratio exceeds 0.4, the amount of water absorbed does not improve significantly despite the increased bulk. The ratio of the depth of the embossing in the embossed pattern to the total paper thickness of 1x kitchen towel sheet is more preferably 0.04 to 0.35, and even more preferably 0.08 to 0.20.

[0042] The ply on the back surface 1b of the kitchen towel sheet 1x has a pattern of irregularities derived from the papermaking process that is different from the embossed pattern, and there are no particular restrictions on whether or not an embossed pattern is applied. Nested embossing or pin-to-pin embossing may be applied, or there may be no embossing at all, but nested embossing or no embossing is preferred, and more preferably no embossing. Conventional kitchen towels ensure water absorption by using pin-to-pin or nested embossing, but when using a base paper with a high paper thickness, as in this application, as mentioned above, applying embossing will crush the paper and reduce water absorption. For this reason, it is preferable that the front surface 1a has linear embossing and the back surface 1b is unembossed.

[0043] In this case, the root mean square height Sq of the surface roughness in the portion of the kitchen towel sheet 1x that does not have an embossed pattern (hereinafter also referred to as the non-embossed portion) is preferably 35 μm or more, more preferably 50 μm to 150 μm, even more preferably 60 μm to 120 μm, and particularly preferably 70 μm to 90 μm. If the root mean square height Sq of the surface roughness is less than 35 μm, the absorbency will be poor. Furthermore, there is no particular upper limit to the root mean square height Sq of the surface roughness, but if the value becomes too high, it may become bulky. The root mean square height (Sq) of the surface roughness of the non-embossed area is measured using a microscope. As with the emboss depth mentioned above, the KEYENCE "One-Shot 3D Measurement Macroscope VR-3100" can be used as the microscope. For observing, measuring, and analyzing the microscope images, the "VR-H1A" software can be used. The measurement conditions are 38x magnification and a field of view of 8mm x 6mm. The magnification and field of view may be adjusted as appropriate depending on the desired emboss size.

[0044] For the image obtained as shown in Figure 6, filters are set in the same way as for the embossing depth described above. Specifically, by setting an S-filter (low-pass filter), components on a scale smaller than the cutoff wavelength are removed from the image, and by setting an L-filter (high-pass filter), components on a scale larger than the cutoff wavelength are removed. Here, the S-filter is set to 500 μm and the L-filter to 8 mm. Once the S-filter and L-filter are selected, the root mean square height Sq is calculated automatically. For the non-embossed areas, similar to the embossing depth, three turns of kitchen towel sheet 1x are removed from kitchen towel roll 1, and the measurement is taken using the fourth turn of kitchen towel sheet 1x in its 2-ply state. If there are perforations, they are avoided during measurement. Two measurements are taken in the width direction of the kitchen towel roll, and then the kitchen towel roll 1 is rotated 90 degrees three times in the flow direction of kitchen towel sheet 1x, and the same measurement is taken at each position (a total of four measurement positions in the flow direction). The average of these eight locations (2 x 4) is finally adopted as the root mean square height Sq.

[0045] (Water absorption) In this invention, a kitchen towel sheet 1x 2-ply 1m 2 The amount of water absorbed per unit is between 220g and 600g. 2If the water absorption capacity per unit is less than 220g, it will be inferior to that of a 1x kitchen towel sheet; if it exceeds 600g, the paper thickness of the 1x kitchen towel sheet will increase, making it bulky. 2 The amount of water absorbed per unit is preferably 270g or more and 550g or less, more preferably 330g or more and 480g or less, and even more preferably 370g or more and 480g or less. Furthermore, it is preferable that the water absorption capacity per gram of the 2-ply kitchen towel sheet 1x is 6g or more. If the water absorption capacity per gram is less than 6g, the water absorption capacity of the kitchen towel sheet 1x is inferior. More preferably, the water absorption capacity per gram is 7.0g or more and 14.0g or less, and even more preferably 8.0g or more and 12.0g or less.

[0046] Furthermore, 1m between 2 plies of kitchen towel sheet 1x 2 The water absorption capacity per unit is preferably between 100g and 300g. 2 If the water absorption per sheet is less than 100g, it will be inferior to the water absorption of a 1x kitchen towel sheet. If it exceeds 300g, the paper thickness of the 1x kitchen towel sheet will increase, making it bulky, and the water absorption will not improve as much despite the bulkiness. In this case, 1m between two plies 2 The amount of water absorbed per meter is 2 ply. 2 Based on the water absorption per unit area, the 1m of 1 ply (surface 1a) described later... 2 Water absorption per unit area and per 1m of 1 ply (back side 1b) 2 This value is calculated by subtracting the amount of water absorbed per unit area. Note that 1m between 2 plies 2 The water absorption capacity per sheet is more preferably 130g to 280g, and even more preferably 160g to 260g. The water absorption capacity of each kitchen towel sheet 1x is measured as follows.

[0047] First, take one sheet of kitchen towel paper (1x) which is made up of two layers, and cut it using a 7.6cm (3-inch) square template to create a rectangular test specimen with sides of 7.6cm. Measure the mass of the test specimen before water absorption using an electronic balance. Set the test specimen in a holder (a jig that secures the test specimen at three points; the jig is made of a metal that does not absorb moisture). Next, fill a commercially available tray with distilled water to a depth of 2 cm, and immerse the test specimen, set in the holder, in the distilled water for 2 minutes. After 2 minutes of immersion, remove the test specimen and holder from the distilled water, and attach the strip 210 to one corner 200d of the test specimen 200, as shown in Figure 7. The strip 210 is made by cutting a kitchen towel sheet 1x, the same as the sample to be measured, to a size of 2 mm wide x 15 mm long, peeling off the ply and using one ply from the back, and attaching it to the part of the test specimen 200 6 mm from corner 200d toward the center. Next, suspend the holder and test specimen 200 from a rod placed in an empty water tank with the corner 200a opposite corner 200d facing upwards, close the lid of the water tank, and leave it for 10 minutes. After that, remove the holder 220 and test specimen 200 from the water tank, remove the strip 210 and holder 220, and measure the mass of the test specimen 200 using an electronic balance. From the change in mass of test piece 200 before and after immersion in distilled water, the 1 m of test piece 200 2 Water absorption capacity of distilled water per sheet (g / m) 2 ) calculate. Furthermore, 1m 2 Water absorption per sheet (g / m²) 2 By dividing ) by the basis weight of 2 ply of test piece 200, 1 m 2 Water absorption per sheet (g / m²) 2 ) / Basis weight (sheet g / sheet m 2 Calculate the amount of water absorbed per gram (g water / g sheet). Measure each sample 5 times and use the average value. To measure the water absorption of a single ply, a kitchen towel sheet (1x) with two layers of layers is cut using a 7.6cm (3-inch) square template to obtain a rectangular test piece (200) with sides of 7.6cm. The layers are then separated, and this is used as the test piece (200) for measuring the water absorption of a single ply. The measurement method is the same as for the two-ply test piece. This measurement will be conducted according to the JIS P 8111 method, under conditions of 23±1°C and 50±2% humidity. The distilled water will also be maintained at 23±1°C.

[0048] In this invention, 1m of 1 ply (surface 1a) of kitchen towel sheet 1x 2 The amount of water absorbed per unit is preferably 50g to 160g, more preferably 60g to 145g, and even more preferably 70g to 130g. In contrast, 1m of 1x kitchen towel sheet 1ply (back side 1b) 2 The amount of water absorbed per unit is preferably 50g to 165g, more preferably 60g to 150g, and even more preferably 70g to 135g. Furthermore, the water absorption capacity per gram of one ply (front surface 1a) of the kitchen towel sheet 1x is preferably 3.0g or more, more preferably 3.5g or more and 7.0g or less, and even more preferably 4.0g or more and 6.0g or less. In contrast, the water absorption capacity per gram of one ply (back surface 1b) of the kitchen towel sheet 1x is preferably 3.1g or more, more preferably 3.6g or more and 7.1g or less, and even more preferably 4.1g or more and 6.1g or less.

[0049] (Core outer diameter) Furthermore, the core outer diameter DI 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 even more preferably 35 mm or more and 45 mm or less. By having the core outer diameter DI within the above range, the winding density of the kitchen towel roll 1 can be suitably maintained, and because it is not bulky, the kitchen towel roll 1 can be easily placed in a kitchen towel holder, and in addition, the handling of the kitchen towel roll 1 during manufacturing is also improved. The core outer diameter was measured using a Diameter Rule manufactured by Muratec KDS Corporation. The measurement was performed on 10 kitchen towel rolls, and the results were averaged. Furthermore, the mass of the core (paper tube) per 280 mm roll width is preferably 5 g to 22 g, more preferably 7 g to 17 g, and even more preferably 9 g to 13 g.

[0050] (specific volume) The specific volume of one kitchen towel sheet is 7 cm³. 3 / g or more 22cm 3 It is preferable that the value is less than or equal to / g. The specific volume of 1x kitchen towel sheet is 7cm³. 3 If the amount is less than / g, the water absorption capacity is inferior to that of one kitchen towel sheet, 22cm 3 When the amount exceeds / g, the water absorption capacity does not improve significantly despite the bulkiness. Note that the above specific volume is 9cm³. 3 / g or more 20cm 3 It is more preferable that it be less than / g, and 12cm 3 / g or more 17cm 3 It is even more preferable that the volume is less than or equal to / g. The specific volume is calculated by dividing the paper thickness per 2 plies of a 1x kitchen towel sheet by the basis weight per 2 plies, and then determining the volume per gram (cm³). 3 It is represented as follows.

[0051] (DMDT and DCDT) Preferably, the dry machine direction tensile strength (DMDT) of the 2-ply kitchen towel sheet 1x is 4.5 N / 25 mm or more and 21 N / 25 mm or less, according to JIS P 8113, and the dry cross direction tensile strength (DCDT) is 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, which has high water absorption like the one in this invention, will be prone to tearing when absorbing water. If the DMDT or DCDT exceeds 21 N / 25 mm, the density of the kitchen towel sheet 1x will be high and its water absorption will be poor. Furthermore, DMDT is more preferably 6.0N / 25mm to 17.0N / 25mm, and even more preferably 7.5N / 25mm to 12.0N / 25mm. Similarly, DCDT is more preferably 6.0N / 25mm to 17.0N / 25mm, and even more preferably 7.5N / 25mm to 12.0N / 25mm. Furthermore, 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 even more preferably 1.0 or more and 1.2 or less.

[0052] (WMDT and WCDT) Furthermore, it is preferable that the wet machine direction tensile strength (WMDT) of the 2-ply kitchen towel sheet 1x, based on the old JIS S 3104, is 1.5 N / 25 mm or more and 8.0 N / 25 mm or less, and that the wet cross direction tensile strength (WCDT) is 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, which has high water absorption like the present invention, will be prone to tearing when absorbing water, and if the WMDT or WCDT exceeds 8.0 N / 25 mm, the density of the kitchen towel sheet 1x will be high and its water absorption will be poor. Furthermore, the WMDT is more preferably 2.0N / 25mm to 6.0N / 25mm, and even more preferably 2.5N / 25mm to 4.5N / 25mm. Similarly, the WCDT is more preferably 2.0N / 25mm to 6.0N / 25mm, and even more preferably 2.5N / 25mm to 4.5N / 25mm. Furthermore, 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 even more preferably 1.0 or more and 1.2 or less.

[0053] (Ply peel strength) The ply peel strength of kitchen towel sheet 1x is preferably between 0.04 N / 75 mm and 2.1 N / 75 mm. If the ply peel strength is less than 0.04 N / 75 mm, the plies will separate, making wiping difficult, and if the ply peel strength exceeds 2.1 N / 75 mm, the water absorption capacity of kitchen towel sheet 1x will be inferior. Furthermore, 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 measurement method is in accordance with the tensile test method of JIS P 8113, using a tensile testing machine (STB-1225S, manufactured by A&D Co., Ltd.), and is performed under the standard conditions specified in JIS P 8111. First, a test piece measuring 75 mm in width and 200 mm in flow direction is taken from a sample of kitchen towel roll 1. Next, a 35 mm ply is peeled in the flow direction. One side of the peeled ply is fixed by clamping it 15 mm in the flow direction to the upper grip (width 75 mm). The other side of the ply is also fixed by clamping it 15 mm in the flow direction to the lower grip (width 75 mm). The grip pitch (spacing) is 20 mm. Next, the material is pulled (peeled) at a tensile speed of 100 mm / min, and strength data is collected. Data is acquired every 20 μm, and the average of the data from a 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 distance from 40 mm to 150 mm after the start of measurement includes a perforation, the distance after the start of measurement can be shortened to a range that does not include the perforation, for example, from 40 mm to 90 mm (measurement length 50 mm).

[0054] (Method for manufacturing kitchen towel sheets and kitchen towel rolls) Kitchen towel sheets 1x and kitchen towel rolls 1 can be manufactured, for example, in the order of (1) papermaking and creping, (2) embossing, and (3) roll winding. In the manufacturing process, it is preferable to use through-air dryer technology. In this case, during the papermaking process, a pattern of irregularities originating from the papermaking process (fabric), different from the embossing pattern described above, is applied to the kitchen towel sheet 1x. Having this pattern of irregularities further increases the water absorption capacity of the kitchen towel sheet 1x. Note that "originating from the papermaking process" means that it is applied during the papermaking process of the kitchen towel sheet 1x between the head box of the papermaking machine and the inlet of the Yankee dryer, and in particular, the irregularities are formed when the sheet is dried together with the fabric in the through-air dryer section. Furthermore, the pattern of the unevenness can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the pattern of the unevenness will change the specific volume (paper thickness), but it is preferable to select a pattern such that the specific volume (paper thickness) of the base paper falls within the numerical range described later. It is also preferable to select a pattern such that the root mean square height Sq of the surface roughness of the non-embossed part of the kitchen towel sheet 1x falls within the numerical range mentioned above.

[0055] When using base paper manufactured using this through-air dryer, it is preferable that the area ratio of the raised portion on the embossing roll for applying the embossing pattern be between 4% and 40%. If the area ratio is less than 4%, the plies tend to peel apart in the case of a kitchen towel sheet 1x with good water absorption, such as the one in this invention. If the area ratio exceeds 40%, the paper of the kitchen towel sheet 1x becomes crushed, resulting in poor water absorption. Furthermore, the area ratio of the raised portion is more preferably 6% to 30%, and even more preferably 9% to 18%. The shape of the raised portion and the embossing itself can be circular, elliptical, rectangular, square, floral, logo, lettering, etc., and there are no particular restrictions on their use, but as mentioned above, linear embossing is preferred. As mentioned above, it is preferable to provide this embossing only on the surface 1a of the kitchen towel sheet 1x.

[0056] At this time, the basis weight of the two-ply base paper used for manufacturing the kitchen towel sheet 1x (the basis weight of one ply doubled) is preferably 31 g / m 2 or more and 58 g / m 2 or less, more preferably 35 g / m 2 or more and 54 g / m 2 or less, still more preferably 39 g / m 2 or more and 50 g / m 2 or less. Also, 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, still more preferably 2.7 mm / 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, still more preferably 12 cm 3 / g or more and 17 cm 3 / g or less.

[0057] Note that the ratio of the embossing depth in the embossing pattern to the paper thickness of the base paper of the kitchen towel sheet 1x, that is, the ratio of the embossing depth in the embossing pattern / the paper thickness of the base paper of the kitchen towel sheet 1x, is preferably 0.01 or more and 0.38 or less, more preferably 0.03 or more and 0.33 or less, still 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 with good water absorption as in the present application, it is not bulky and is difficult to have ply peeling, and the water absorption can be improved. Also, 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 preferably -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, still more preferably -1 cm 3 / g or more and 0.5 cm3 It is even more preferable to be less than or equal to / g, and -0.5cm 3 / g or more 0cm 3 A value of less than / g is particularly preferred.

[0058] The present invention is not limited to the embodiments described above, but extends to various modifications and equivalents that fall within the spirit and scope of the present invention. [Examples]

[0059] (1) Papermaking and creping, (2) Embossing, and (3) Roll winding were performed to produce kitchen towel sheets and kitchen towel rolls of Examples 1 to 27 and Comparative Examples 1 to 12. In addition, one type of commercially available kitchen towel sheet and kitchen towel roll was prepared. The above parameters were measured and evaluated for all of the above examples, comparative examples, and commercially available kitchen towel rolls. Regarding the embossing pattern, the number and thickness of the lines were appropriately changed in each example and comparative example, and the embossing was applied only to the front side of the kitchen towel sheet. Specifically, in Comparative Example 7 to Example 18, the number of embossing lines was increased, while in Example 19 to Comparative Example 8, the number of embossing lines was not increased, but the thickness of the embossing lines was increased. For commercially available products, including product 1, if the roll width is not 280 mm, the mass of the roll is listed after converting it to a value per 280 mm roll width.

[0060] The following items were evaluated for the manufactured kitchen towel sheets and kitchen towel rolls. Basis weight: The basis weight of a 2-ply kitchen towel sheet was measured and evaluated as follows. 61g / m 2 Exceeding: 1 point 54g / m 2 Exceeding 61g / m 2 Below: 2 points 50g / m 2 Over 54g / m 2 Below: 3 points 46g / m 2 Over 50g / m 2 Below: 4 points 46g / m 2 Below: 5 points

[0061] Water absorption: 1 m of 2-ply sheet using the method described above. 2 Water absorption capacity (water g / sheet m) 2 The following measurements were taken and evaluated as described below. 170g (water / sheet m) 2 Less than: 1 point 170g (water / sheet m) 2 ) or more 220 (water g / sheet m) 2 Less than: 2 points 220 (water g / sheet m) 2 ) or more 270 (water g / sheet m 2 ) Less than: 3 points 270g (water / sheet m) 2 ) or more 330 (water g / sheet m 2 ) Less than: 4 points 330g (water / sheet m) 2 ) or more 370 (water g / sheet m 2 ) Less than: 5 points 370g (water / sheet m) 2 ) Above: 6 points

[0062] Compactness: The paper thickness and roll diameter were measured using the method described above, and evaluated as shown in Table 1 below. [Table 1]

[0063] Replacement frequency: The winding length was measured and evaluated as follows. Less than 10m: 1 point 10m to less than 14m: 2 points 14m to less than 21m: 3 points 21m to less than 25m: 4 points 25m or more: 5 points

[0064] Wipeability (resistance to ply peeling): The peel strength of the ply was measured and evaluated as follows. 0.01N / less than 75mm: 1 point 0.01N / 75mm or more and less than 0.04N / 75mm: 2 points 0.04N / 75mm or more and less than 0.10N / 75mm: 3 points 0.10N / 75mm or more and less than 0.15N / 75mm: 4 points 0.15N / 75mm or more: 5 points

[0065] The results obtained are shown in Tables 2-4. [Table 2]

[0066] [Table 3]

[0067] [Table 4]

[0068] From the above, it can be seen that the kitchen towel roll of the present invention has good water absorption, is not bulky, does not peel off the ply, and requires infrequent replacement, even when the basis weight is kept within a certain range without being excessively high. [Explanation of symbols]

[0069] 1 Kitchen towel roll 1a surface 1b back side 1e Kitchen towel sheet outermost edge 1x Kitchen Towel Sheet 200 test specimens 200a, 200d corner 210 band 220 holder

Claims

1. A kitchen towel roll is made by bonding sheets with an embossed pattern together with glue, laminating them into two plies, and then winding the resulting roll into a roll shape. The kitchen towel sheet has a pattern of irregularities derived from the papermaking process, which is applied between the headbox of the paper machine and the inlet of the Yankee dryer, and is different from the embossed pattern. The 2-ply has a basis weight of 30 g / m². ２ 54g / m or more ２ The following paper thicknesses are 1.3 mm / 10 sheets or more and 5 mm / 10 sheets or less: 2-ply 1m ２ The water absorption capacity per unit is 220g or more and 600g or less, and the water absorption capacity per gram of 2-ply is 6g or more. The ply peel strength is 0.04 N / 75 mm or more and 2.1 N / 75 mm or less. A kitchen towel roll characterized in that the length of the roll is 14 m or more and 44 m or less, and the diameter of the roll is 110 mm or more and 189 mm or less.

2. 1 meter between the two plies of the aforementioned kitchen towel sheet ２ The kitchen towel roll according to claim 1, characterized in that the amount of water absorbed per roll is 100g or more and 300g or less.

3. The kitchen towel roll according to claim 1 or 2, characterized in that the depth of the embossing in the embossed pattern is 0.06 mm or more and 1.1 mm or less.

4. The kitchen towel roll according to any one of claims 1 to 3, characterized in that the ratio of the depth of the embossing in the embossing pattern to the total paper thickness of the kitchen towel sheet is 0.02 or more and 0.4 or less.

5. The roll density of the aforementioned kitchen towel roll is 0.04 g / cm². ３ 0.15g / cm or more ３ The kitchen towel roll according to any one of claims 1 to 4, characterized in that it is as follows:

6. The winding density of the aforementioned kitchen towel roll is 0.22 m / cm ２ 0.68m / cm or more ２ The kitchen towel roll according to any one of claims 1 to 5, characterized in that it is as follows:

7. The kitchen towel roll according to any one of claims 1 to 6, characterized in that the area ratio of the raised portion in the embossing roll for applying the embossing pattern is 4% or more and 40% or less.

8. The kitchen towel roll according to any one of claims 1 to 7, characterized in that the embossed pattern is linear.

9. Regarding the emboss with a thickness of 0.1 mm or more and 4 mm or less and a length of 5 mm or more in the linear emboss pattern, the total length when adding the lengths of the embosses is 50 cm / 100 cm ２ or more and 550 cm / 100 cm ２ The kitchen towel roll according to claim 8, characterized in that it is below this value.

10. The kitchen towel roll according to any one of claims 1 to 9, characterized in that the root mean square height of the surface roughness in the portion of the kitchen towel sheet not having the embossed pattern is 35 μm or more.

11. The kitchen towel roll according to any one of claims 1 to 10, characterized in that the kitchen towel sheet does not have an embossed surface on its back.

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