JP2023065593A - toilet roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toilet roll in which the basis weight of toilet paper is equivalent to that of the conventional products, and a winding length per one roll is long, and which is excellent in tough and an appearance and is also excellent in carrying and space-saving properties in the storage.

SOLUTION: A toilet roll is configured by winding toilet paper which is 2-ply laminated, and to which an embossment pattern is imparted in a roll shape. In the toilet roll, a winding length is 63 m or more and 128 m or less, a winding diameter is 103 mm or more and 151 mm or less, and an area rate of the embossment pattern is 25% or more and 80% or less.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toilet roll obtained by winding toilet paper laminated into two plies and provided with an embossed pattern into a roll.

Toilet rolls are mainly packaged as a set of 4 rolls or 12 rolls and are commercially available. Since packaged toilet rolls are bulky, the number of toilet rolls that can be carried at the time of purchase is limited, and such restrictions limit the quantity that can be purchased at one time. Toilet rolls are sometimes stored in homes, workplaces, public facilities, etc., but it is not always possible to secure a large storage space.

Under these circumstances, toilet rolls have been proposed in which the basis weight per sheet of toilet paper is reduced to 14 g/m ² or less and the winding length per roll is increased (for example, Patent Documents 1 and 2). See) In addition, toilet rolls have been developed in which the basis weight per sheet of toilet paper is greater than 13 g/m ² to improve texture and usability, while the roll length is increased (for example, Patent Documents 3 and 4). reference). Further, toilet rolls with improved winding density and winding firmness have been developed (see Patent Documents 5 and 6, for example).

Japanese Patent Application Laid-Open No. 2006-087703 JP 2013-208297 A JP 2014-188342 A JP 2014-233363 A JP 2016-198409 A JP 2016-202855 A

However, in general, when the basis weight of toilet paper is lowered, the strength is lowered, and the usability and bulkiness are also lowered. On the other hand, if the processing is weakened for the purpose of making the toilet paper bulky in order to compensate for these problems, the diameter of the roll increases, making it difficult to fit in the toilet paper holder and the smoothness of the roll being inferior.

In addition, in order to avoid an increase in the roll diameter and not to interfere with mounting on the toilet paper holder while increasing the roll length of the toilet roll, it is necessary to increase the roll density. Here, since the embossing provided on the toilet paper affects the tactile sensation and cosmetic properties during use, when the roll density is increased, excessive pressure is applied to the inner roll of toilet paper in particular, and the emboss provided on the inner roll of toilet paper is reduced. However, there is a problem that the tactile sensation and cosmetic properties during use are deteriorated. In addition, in the prior art documents mentioned above, the embossed pattern is not studied in detail, and the embossing process may increase the difference between the front and back surfaces, resulting in an unfavorable tactile feel.

Therefore, the toilet paper of the present invention has a basis weight equivalent to that of conventional products, a long winding length per roll, good touch and cosmetic properties during use, and excellent portability and space saving during storage. The purpose is to provide a toilet roll with

The inventors of the present invention conducted intensive research in order to solve the above problems. As a result, by adjusting the area ratio of the embossed pattern to a predetermined range in the toilet roll in which the embossed pattern is imparted to the toilet paper, the tactile feel and cosmeticity during use can be maintained well, and the winding length of the toilet roll can be increased. However, the inventors have found that it is possible to avoid an increase in the winding diameter, and have completed the present invention. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a toilet roll obtained by winding toilet paper laminated into two plies and having an embossed pattern, the roll length being 63 m or more and 128 m or less, and the roll diameter being 63 m or more and 128 m or less. The toilet roll has a size of 103 mm or more and 151 mm or less, and an embossed pattern area ratio of 25% or more and 80% or less.

(2) A second aspect of the present invention is the toilet roll according to (1), wherein the lines connecting the centers of gravity of the embossed patterns in the machine direction and the width direction are substantially linear, and the adjacent The embossed pattern is characterized in that the distance between the embossed patterns in the width direction is larger than the distance between them in the machine direction.

(3) A third aspect of the present invention is the toilet roll according to (2), wherein the inclination of the line connecting the center of gravity of the embossed pattern to the line parallel to the flow direction is 0° or more and 10°. ° or less.

(4) A fourth aspect of the present invention is the toilet roll according to (2) or (3), wherein an auxiliary embossed pattern is provided between the embossed patterns adjacent in the width direction, and the embossed pattern and the auxiliary embossed pattern form a substantially comma shape or a substantially reverse comma shape.

(5) A fifth aspect of the present invention is the toilet roll according to any one of (1) to (4), wherein the depth of the embossed pattern is 0.01 mm or more and 0.34 mm or less. It is characterized.

According to the present invention, the basis weight of the toilet paper is maintained at the same level as that of the conventional product, the roll length per roll is long, the touch feeling and cosmetic properties during use are good, and the portability and space saving during storage are improved. Able to provide excellent toilet rolls.

1 is a perspective view showing the appearance of the toilet roll of the present invention; FIG. It is a figure which shows the picked-up image of the embossed pattern on the roll surface side. It is a figure which shows the aspect of an embossing pattern. It is a figure which shows the aspect of an embossing pattern. It is a figure which shows the aspect of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossed pattern. It is a figure which shows an example of a roll winding machine. FIG. 10 is a diagram showing a photographed image of a defective product in which the inner winding side of the roll protrudes in the axial direction;

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.

<toilet roll>
FIG. 1 is a perspective view showing the appearance of the toilet roll of the present invention. The toilet roll 1 of the present invention is a toilet roll 1 in which toilet paper 1x laminated in two plies and provided with an embossed pattern 2 is wound into a roll, and the winding length (winding length) is 63 m or more and 128 m. Below, the roll diameter DR (roll outer diameter) is 103 mm or more and 151 mm or less, and the area ratio of the embossed pattern 2 is 25% or more and 80% or less.

Further, among the surfaces of the toilet paper 1x, the surface oriented to the outside of the roll is referred to as the roll surface 1a (the surface of the toilet paper 1x), and the surface oriented to the center of the roll is referred to as the roll back surface 1b (the back surface of the toilet paper 1x). . The flow direction MD of the toilet roll 1 is the direction in which the two-ply laminated toilet paper 1x is wound into a roll, and the width direction W of the toilet roll 1 is the direction orthogonal to the flow direction MD. .

[Volume length]
Since the roll length of the toilet roll 1 is 63 m or more and 128 m or less, the replacement frequency of the toilet roll 1 can be reduced, space saving can be achieved, and the roll diameter DR can be maintained within an appropriate range. The roll 1 will be fully accommodated in the toilet paper holder. The winding length is preferably 68 m or more and 105 m or less, more preferably 75 m or more and 93 m or less.

[Winding diameter]
When the roll diameter DR of the toilet roll 1 is 103 mm or more and 151 mm or less, the roll length of the toilet roll 1 is maintained within a suitable range, and the toilet roll 1 can be sufficiently accommodated in the toilet paper holder. The winding diameter DR is preferably 112 mm or more and 140 mm or less, more preferably 115 mm or more and 127 mm or less.

[Roll softness]
When evaluating the softness of the toilet roll 1 having a long winding length as in the present invention, the softness of the roll when held in the hand can be evaluated by evaluating the roll softness described below.

The roll softness of the toilet roll 1 is measured using a compression tester (handy compression tester KES-G5 manufactured by Kato Tech Co., Ltd.) as follows. The direction parallel to the axis of the toilet roll 1 is defined as the height direction, and the direction perpendicular to the tangent to the circumference of the toilet roll 1 and the axis is defined as the radial direction.

First, an acrylic pipe is inserted into the core of the toilet roll 1 . The thickness of the acrylic pipe shall be 2 mm. The length of the acrylic pipe is 10 mm longer than the roll width of the toilet roll 1 (when the roll width of the toilet roll 1 is 114 mm, the length of the acrylic pipe is 124 mm). The outer diameter of the acrylic pipe is slightly smaller than the inner diameter of the core of the toilet roll 1, and when the toilet roll 1 is placed so that the axis of the toilet roll 1 is vertical after the acrylic pipe is inserted, the toilet roll 1 moves under its own weight. not large enough. If it is difficult to insert the acrylic pipe into the core and the outer diameter of the acrylic pipe is to be slightly reduced, the wall thickness may be slightly reduced with waterproof paper or the like. The weight of the acrylic pipe is about 31 g when the length is 125 mm and the outer diameter is 38 mm.

Next, the toilet roll 1 is placed horizontally on a hard table so that the axis is horizontal. Then, the KES-G5 compressor (contact area: 2.0 cm ² ) was radially pushed into the center of the toilet roll 1 in the height direction from above at a speed of 10 mm/min. Let T0 be the pushing depth when the pressure of the compressor pushing the roll is 5 gf/cm ² , Tm be the pushing depth when the pressure is 150 gf/cm ² , and (Tm−T0) is roll softness. The measurement is performed 5 times and the measurement results are averaged. Note that the position in the height direction when the compressor is pushed into the toilet roll 1 does not have to be the center in the height direction, except for both ends in the height direction. In the measurement of the roll softness of the toilet roll 1 of the present invention, the compressing element is pushed into the vicinity of the middle between the central portion and the end portions of the toilet roll 1 in the height direction.

The roll softness of the toilet roll 1 of the present invention is preferably 0.1 mm or more and 1.6 mm or less, more preferably 0.3 mm or more and 1.3 mm or less, and 0.5 mm or more and 1.0 mm or less. It is even more preferable to have As a method of adjusting the roll softness of the toilet roll 1 to the above range, there is a method of adjusting the roll winding strength with a roll winder (especially surface type) while adjusting the basis weight and paper thickness within a predetermined range.

[Winding density]
In the present invention, the winding density of the toilet roll 1 is preferably 1.2 m/cm ² or more and 2.2 m/cm ² or less. Here, if the roll is wound too tightly, excessive pressure is applied to the inner roll of toilet paper 1x, and the embossing provided on the inner roll of toilet paper 1x is crushed, resulting in a decrease in tactile sensation and cosmeticity during use. On the other hand, if the roll is wound too weakly, the embossment will not be crushed, but the winding diameter will increase, making it difficult to attach the toilet roll 1 to the toilet paper holder, or the winding force of the inner winding will become too weak. As shown in the photographed image of FIG. 8, the inner winding side of the roll protrudes in the axial direction, resulting in defective products. For this reason, in this specification, the winding density is defined as a factor for expressing the winding strength of the roll.

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) portion}-(core (paper tube) outer diameter portion 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 75 m, 2 plies, the winding diameter is 117 mm, and the outer diameter of the core is 39 mm, the winding density = (75 m × 2) ÷ {3.14 × (117 mm ÷ 2 ÷ 10) ² -3.14 × (39 mm ÷2÷10) ² }=1.57 m/cm ² . If the toilet roll 1 does not have a core, the diameter of the center hole is taken as the outer diameter of the core.

When the winding density is 1.2 m/cm ² or more and 2.2 m/cm ² or less, the winding diameter DR is positioned in an appropriate range, making it easier for the toilet roll 1 to fit in a toilet paper holder or the like, and The winding force of the winding becomes appropriate, the inner winding side of the roll does not protrude in the axial direction (the shape retention of the roll is poor), and the product is not defective. The embossing provided on the toilet paper 1x is not crushed, and the tactile sensation and cosmeticity during use are maintained. The winding density is more preferably 1.3 m/cm ² or more and 1.9 m/cm ² or less, and even more preferably 1.4 m/cm ² or more and 1.7 m/cm ² or less.

[Basis Weight]
The basis weight per ply of toilet paper 1x is preferably 11.0 g/m ² or more and 19.0 g/m ² or less, and the paper thickness at this time is 0.45 mm/10 ply or more and 1.20 mm/10 ply. Ply or less is preferred. When the basis weight and paper thickness are within the above ranges, it becomes easier to adjust the roll length, roll diameter DR, and roll density within the above ranges. As a method for adjusting the basis weight and paper thickness per ply of the toilet paper 1x within the above ranges, there is a method of defining the paper thickness, specific volume and embossing conditions of the base paper web.

Since the basis weight and paper thickness per ply of the toilet paper 1x are within the above ranges, the strength and usability (bulkness) of the toilet paper 1x are preferably maintained, and the roll of the toilet roll 1 is increased. The diameter DR is also maintained within an appropriate range, making it easier to fit in the toilet paper holder. The basis weight per ply of toilet paper 1x is more preferably 13.1 g/m ² or more and 17.0 g/m ² or less, and more preferably 14.1 g/m ² or more and 16.0 g/m ² or less. is more preferred. The thickness of the toilet paper 1x is more preferably 0.57 mm/10 ply or more and 1.05 mm/10 ply or less, and further preferably 0.65 mm/10 ply or more and 0.90 mm/10 ply or less.

[Embossed pattern]
A toilet roll 1 (toilet paper 1x) of the present invention is embossed and has an embossed pattern 2. As shown in FIG. As the embossed pattern 2 of the toilet paper 1x of the present invention, both double embossing and single embossing can be adopted, but the single embossing pattern is preferable. Double embossing generally reduces the difference between the front and back sides of the embossed pattern because the two plies are formed with the embossed convex surfaces on the inside, but the production is complicated because each sheet is embossed separately. As shown in FIG. 7, the single embossed pattern is formed by pressing the embossed protrusions of the embossing roll 111 only from one side of the toilet paper 1x in which the sheets are laminated into two plies, and the embossing roll 111 of the toilet paper 1x An embossed pattern 2 (single embossed pattern) is formed in which a concave portion appears on the pressed surface and a convex portion appears on the back surface, so the difference between the front and back of the embossed pattern generally tends to increase, but the embossed pattern of the present application, which will be described later, is used. This makes it possible to reduce the difference between the front and back of the embossed pattern even with single embossing. The two-ply laminated toilet paper 1x may be embossed a plurality of times. In addition, even when single embossing or double embossing is provided, edge embossing may be further provided to prevent ply peeling of the sheet. The material of the embossing roll 111 is preferably metal.

FIG. 3 is a drawing showing a mode of the embossed pattern 2. As shown in FIG. As shown in FIG. 3, the lines connecting the centers of gravity of the embossed patterns 2 in the machine direction MD and the width direction W are substantially straight lines, and the distance between the adjacent embossed patterns 2 in the machine direction W is the distance in the machine direction MD. greater than the separation distance in By forming the embossed pattern 2 in such a manner, as shown in FIG. 2, an appearance having a plurality of linear patterns along the flow direction MD is obtained, which is excellent in appearance. Further, when using the toilet roll 1, it is normal to use the toilet paper 1x by pulling it in the machine direction MD while holding it by hand. By making the separation distance larger than the distance in , the touch and the feeling of fitting to the fingertips are improved, and the tactile sensation during use is improved.

Moreover, the inclination of the line connecting the center of gravity of the embossed pattern 2 to the flow direction MD with respect to the line parallel to the flow direction MD is preferably 0° or more and 10° or less. FIG. 4 is a drawing showing the embossed pattern 2 when the inclination of the line connecting the center of gravity of the embossed pattern 2 to the machined direction MD is 13° with respect to the line parallel to the machined direction MD. In this way, when the embossed pattern 2 is formed such that the inclination of the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD with respect to the line parallel to the machine direction MD is more than 10°, the thickness of the toilet roll 1 becomes Since the recesses and recesses and the protrusions and protrusions of the embossed patterns 2 of the toilet paper 1x that overlap each other in the direction are difficult to overlap, the embossing is likely to be crushed, and the tactile sensation and cosmeticity are impaired during use. In particular, when winding a long toilet roll like the toilet roll 1 of the present invention, the toilet paper is processed with a strong tension, so the embossing is stretched, and the cosmetic appearance of the embossment is further reduced. It's easy to do. Therefore, in order to make it easier to overlap the recesses and recesses of the embossed patterns 2 and the protrusions to the protrusions of the overlapping toilet paper 1x, and to prevent the embossed patterns 2 from collapsing, the embossing for the line parallel to the flow direction MD is performed. The inclination of the line connecting the center of gravity of the pattern 2 to the flow direction MD is preferably 0° or more and 10° or less, more preferably 0° or more and 5° or less, and preferably 0° or more and 2° or less. More preferred. Further, from the viewpoint of making the embossed pattern 2 more difficult to collapse, as shown in FIG. In other words, it is most preferable that the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD is parallel to the line parallel to the machine direction MD.

The inclination of the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD with respect to the line parallel to the machine direction MD can be measured by the following method. First, the distance from either end in the width direction W to the nearest embossed pattern 2 is measured at a position pulled out 50 cm from the edge of the outermost roll of the toilet roll 1 in the machine direction. Next, it is on the line connecting the center of gravity of the embossed pattern 2 whose distance was measured from the end of the width direction W on the side where the above measurement was performed at the position further pulled out by 50 cm in the flow direction MD Measure the distance to the embossed pattern 2. In this way, the distances from the embossed pattern 2 and one end in the width direction W at two points on the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD are respectively measured, and the larger of the two measured values The slope of the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD can be obtained by using a numerical value obtained by subtracting a small measured value from , and the distance (50 cm) between the two points parallel to the machine direction MD.

(Area ratio and depth of embossed pattern)
In the toilet roll 1 of the present invention, the area ratio of the embossed pattern 2 (ratio of the portion of the toilet paper 1x having the embossed pattern 2) is adjusted to be 25% or more and 80% or less. By adjusting the area ratio of the embossed pattern 2 to the above range, the difference between the front and back of the embossed pattern 2 can be appropriately maintained, and the tactile sensation and cosmetic properties during use can be maintained satisfactorily. Here, the area ratio of the embossed pattern for toilet paper is usually 20% or less. By increasing the area ratio of the embossed pattern as in the present invention, the paper thickness can be reduced without calendering the base paper. Can be adjusted to any winding diameter. The area ratio of the embossed pattern 2 is more preferably 35% or more and 70% or less, and even more preferably 45% or more and 60% or less.

In addition, in the toilet roll 1 of the present invention, the depth of the embossed pattern 2 is preferably 0.01 mm or more and 0.34 mm or less, more preferably 0.04 mm or more and 0.29 mm or less, and 0.09 mm. It is more preferable that the distance is not less than 0.25 mm and not more than 0.25 mm. By adjusting the depth of the embossed pattern 2 within the above range, the difference between the front and back sides of the embossed pattern 2 can be maintained more effectively, and the tactile sensation and cosmetic properties during use can be maintained satisfactorily.

The area ratio and depth of the embossed pattern 2 are obtained by measuring the height difference of the embossed pattern 2 using a microscope. The numerical values of the above area ratio and depth are numerical values obtained by measuring only the embossed pattern 2 without reflecting the auxiliary embossed pattern 21 described later.

As a microscope, the product name "One-shot 3D measurement microscope 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. In addition, measurement conditions are a magnification of 12 times and a visual field area of 24 mm×18 mm. Note that the measurement magnification and the visual field area may be appropriately changed depending on the desired size of the embossed pattern 2 . Regarding the measurement of the embossed pattern 2, the measurement surface is the roll surface 1a instead of the roll back surface 1b, and the position corresponding to 10% of the roll length of the toilet roll 1 from the edge 1e of the outermost roll of the toilet paper 1x of the toilet roll 1. , an embossed pattern 2 continuous in the width direction W is selected and measured. In addition, the area ratio and depth of the embossed pattern 2 are measured while the toilet roll 1 is in a roll shape. Here, since the toilet roll 1 has a bulky shape, it may be difficult to focus the microscope. In this case, the stage (table) on which the sample is placed may be removed and the focus may be adjusted for measurement. In addition, when said edge embossing is provided, the area|region to measure shall be area|regions other than an edge embossing area|region.

FIG. 6(a) shows a height profile on the XY plane by a microscope, and it can be seen that the height of the surface of the toilet paper 1x is represented by shading. Under the profile measurement conditions, a line segment (horizontal line) is drawn across the embossed pattern 2, and as shown in FIG. A cross-sectional curve is obtained, and the graph shown in FIG. Here, the (measurement) cross-sectional curve in FIG. 6 (b-1) is a (measurement) cross-sectional curve that represents the unevenness of the surface of the toilet roll, but noise (such as there is a lump of fiber on the surface of the toilet roll, or there is no fiber) It also includes sharp peaks caused by stretched whiskers or parts without fibers), and when calculating the height difference of unevenness and calculating the area ratio shown below, such noise peaks are removed. There is a need. Therefore, the (measurement) profile curve in FIG. 6(b-1) is smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the profile curve in FIG. 6(b-2). 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. 6(b-2), the average value of the maximum values of each of the convex portion of the graph and the convex portion adjacent to the convex portion on the vertical axis is calculated. The minimum value of the vertical axis in the convex portion adjacent to the portion and the concave portion sandwiched between them is obtained. The depth of the embossed pattern 2 is obtained by subtracting the minimum value from the average value of the maximum values thus obtained. As shown in FIG. 6(b-1), the same measurement is performed for a total of three continuous points on the cross-sectional curve (unevennesses that do not include auxiliary embossing) (at this point, three measurement results that are continuous in the width direction are can get). After that, the 2-ply toilet paper 1x is removed by one roll, and the same measurement as described above is performed at the same roll position as the first measurement. This operation is repeated two more times to obtain a total of four measurements in the flow direction. Then, the average value of a total of 12 locations (3 locations in the width direction×4 locations in the machine direction) is finally adopted as the depth of the embossed pattern 2 . In addition, the pitch in the width direction on the profile (the distance between the convex portion and the convex portion adjacent to the convex portion) is preferably 1 mm or more and 12 mm or less, more preferably 2 mm or more and 9 mm or less, and 3 mm. It is more preferable that the distance is not less than 6 mm and not more than 6 mm. By setting the pitch in the width direction within the range described above, it is possible to maintain good touch and cosmetic properties during use.

Next, a method for measuring the area ratio of the embossed pattern 2 will be described with reference to FIG. 6(c). As shown in FIG. 6(c), a line A is drawn connecting the maximum values on the vertical axis in the convex portion of the graph and the convex portion adjacent to the convex portion. A line B perpendicular to the line A is drawn from a point indicating the minimum value of the vertical axis of the concave portion sandwiched between the convex portion adjacent to the convex portion. Next, a line C parallel to the line A is drawn from the point indicating the minimum value of the vertical axis in the recess. Next, a line D perpendicularly connecting to the line C is drawn from the points corresponding to the maximum values on the vertical axis in the convex portion and the convex portion adjacent to the convex portion. Next, draw a line E parallel to lines A and C from the center point of line B. In this way, after drawing a plurality of lines, the area of the area surrounded by the lines on the graph, the line B, and the line E, that is, the sum of the areas of the areas F and G in FIG. to the area of the area surrounded by the lines of the graph, the line D, and the line E, that is, the sum of the areas of the areas H and I in FIG. The area ratio (%) of the embossed pattern 2 is obtained by dividing the area of the F and G parts by the total area and multiplying the result by 100. Therefore, in FIG. 6(c), the numerical value calculated by the formula (area of F area+area of G area)/(area of F area+area of G area+area of H area+area of both I machines)×100 is the emboss pattern. It becomes the area ratio of 2. The same measurement is performed for a total of 3 continuous points on the cross-sectional curve (irregularities not including auxiliary embossing) (at this point, 3 continuous measurement results in the width direction are obtained). After that, the 2-ply toilet paper 1x is removed by one roll, and the same measurement as described above is performed at the same roll position as the first measurement. This operation is repeated two more times to obtain a total of four measurements in the flow direction. Then, the average value of a total of 12 locations (3 continuous locations in the width direction×4 locations in the machine direction) is finally adopted as the area ratio of the embossed pattern 2 . In addition, when winding a long toilet roll like the present invention, the sheet is processed with a strong tension, so the embossing is easily stretched in the machine direction, and the center of gravity of the emboss pattern 2 is in the machine direction MD and The lines connecting in the width direction W are each substantially linear, and the distance between adjacent embossed patterns 2 in the width direction W is greater than the distance in the machine direction MD, so the area ratio in the width direction is measured. The area ratio of the embossed pattern 2 has conventionally been obtained by image analysis or the like using the convex portions of the embossed pattern 2 . In the present invention, it was found that there is a correlation between the area ratio of the projections of the embossing roll and the area ratio of the above measuring method, and the area ratio of the embossed pattern was measured by the above method.

The shape of the embossed pattern 2 is not particularly limited and may be rectangular, square, round, oval, or the like. Further, the winding diameter DR and the winding density can be adjusted by appropriately adjusting the depth of the embossed pattern 2 and the area ratio (number) of the embossed pattern 2 .

By the way, as described above, when the embossed pattern 2 is formed such that the inclination of the line connecting the center of gravity of the embossed pattern 2 to the flow direction MD with respect to the line parallel to the flow direction MD is 0°, the toilet In the manufacturing process of the roll 1, the protrusions of the embossing roll 111 continue to contact a specific position of the opposing rubber roll 112, and the deterioration of the rubber roll 112 progresses at that position, the replacement frequency of the rubber roll 112 increases, and the cost increases. may be burdensome. Therefore, it is preferable to have an auxiliary embossed pattern 21 between the embossed patterns 2 adjacent in the width direction W, and to form a substantially comma shape or a substantially inverted comma shape by the embossed pattern 2 and the auxiliary embossed pattern 21 . In this specification, the auxiliary embossing pattern is defined as an embossing that has fewer depressions in the embossed portion than the non-embossed portion and is not included in the embossed pattern 2 when the toilet roll 1 is viewed in the machine direction. In addition, as shown in FIG. 5, the auxiliary embossed pattern 21 is preferably connected to the embossed pattern 2 in the width direction. FIG. 5 shows a mode in which the embossed pattern 2 and the auxiliary embossed pattern 21 form a substantially inverted comma shape. By providing the auxiliary embossing pattern 21 in this way, the projections of the embossing roll 111 come into uniform contact with the rubber roll 112, and the deterioration speed of the rubber roll 112 can be slowed down. The thickness of the auxiliary embossed pattern 21 is preferably 0.05 mm or more and 2.0 mm or less, more preferably 0.1 mm or more and 1.5 mm or less, and 0.2 mm or more and 1.0 mm or less. is more preferred. The depth of the auxiliary embossed pattern 21 is preferably 0.01 mm or more and 0.32 mm or less, more preferably 0.04 mm or more and 0.27 mm or less, and 0.08 mm or more and 0.24 mm or less. is more preferred. The auxiliary embossed pattern 21 can be formed by appropriately adjusting the unevenness of the embossing roll 111 .

FIG. 7 shows an example of the roll winding machine 110 . Two raw fabric rolls 12 are set in a roll winding machine 110, and after being laminated into two plies so that the Yankee surface is on the outside, they are single embossed by an embossing unit (embossing roll 111), and then wound up. The mechanism 113 winds up the wide base paper roll 13 having the winding diameter DR. After that, the base paper roll 13 is cut into a predetermined width (114 mm or the like) to obtain the toilet roll 1 . The raw fabric roll 12 may be subjected to calendering, but in the present invention, the embossing reduces the paper thickness and specific volume, so the need for calendering is low, and it is preferable not to calender. is preferable from the viewpoint of improving productivity.

The roll winding machine 110 can be broadly classified into two types: a surface type and a center type. The surface method is a method of winding while supporting a roll to be wound from the outside with a plurality of separate drive rolls, and the wound toilet roll 1 can easily control the winding diameter and can be produced at a higher speed. The center method is a method of winding by driving a shaft passed through the center of the winding roll, and the wound toilet roll 1 becomes a relatively soft product and is suitable for delicate embossed products. In the present invention, the film can be wound by any method, but the surface method is preferred. According to the surface method, the winding diameter DR and the roll softness of the toilet roll 1 can be relatively easily adjusted by the strength with which the toilet roll 1 is wound.

The depth of the embossed pattern 2 can be controlled by appropriately adjusting the nip width of the rubber roll 112 (see FIG. 7) facing the embossing roll 111 . The nip width is preferably 20 mm to 50 mm, more preferably 25 mm to 45 mm, even more preferably 30 mm to 40 mm, although it varies depending on the properties of the rolls. By setting the nip width within the above range, the difference between the front and back sides of the embossed pattern 2 can be properly maintained, and the paper thickness can be properly maintained, the winding diameter DR of the roll can be appropriately maintained, and the softness of the sheet can be improved. The thickness is also preferably maintained. The nip width can be measured using carbon paper. As for the measurement method, first, the nip of the embossing roll 111 is released, and carbon paper and general copy paper are overlapped and set. Next, the embossing roll 111 is nipped. Then release the nip and remove the carbon paper and copy paper. Since the color of the carbon paper in the portion nipped by the embossing roll 111 is transferred to the copy paper, the nip width can be measured. The material of the embossing roll 111 is preferably metal.

The depth of the emboss pattern 2 can be adjusted by narrowing the nip width if the unevenness of the embossing roll 111 is deep and widening the nip width if the unevenness of the embossing roll 111 is shallow. Also, the strength of winding the roll can be adjusted so as to ensure the depth of the embossed pattern 2 . For example, when the depth of the embossed pattern 2 increases, the embossed pattern 2 is easily crushed when the roll is wound.

Printing, embossing, perforation, tail sealing, and cutting to a predetermined width (114 mm or the like) can be simultaneously performed by the roll winding machine 110, and the toilet roll 1 can be manufactured. Furthermore, after that, the film packaging process can be performed to manufacture the package of the toilet roll 1 .

[Roll density, roll mass]
The roll mass is the mass of the toilet roll 1 per roll width of 114 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 114 mm). For example, when the roll mass per roll width of 114 mm is 327 g, the winding diameter is 122 mm, and the core outer diameter is 39 mm, the roll density = 327 g ÷ [{3.14 × (122 mm ÷ 2 ÷ 10) ² -3.14 × ( 39 mm÷2÷10) ² }×(114 mm÷10)]=0.27 g/cm ³ . If the toilet roll 1 does not have a core, the diameter of the center hole is taken as the outer diameter of the core.

The roll density of the toilet roll 1 is preferably 0.18 g/cm ³ or more and 0.35 g/cm ³ or less, more preferably 0.20 g/cm ³ or more and 0.31 g/cm ³ or less, and 0 0.22 g/cm ³ or more and 0.27 g/cm ³ or less is more preferable. By setting the roll density of the toilet roll 1 within the above range, the embossed pattern 2 of the inner roll of the toilet paper 1x is not crushed, and the feel and beauty of the toilet paper 1x during use are improved. maintained. In addition, the softness of the roll is well maintained, the winding diameter DR is maintained within an appropriate range, and the roll can be easily accommodated in a toilet paper holder, and the inner winding side of the roll does not protrude in the axial direction.

Here, the softness of the roll means the tactile sensation when holding the toilet roll 1 in the store, and does not directly reflect the softness of the sheet. However, since it is not possible to check the softness of the sheet by unwinding the roll at the store, even if the sheet itself is soft, if the roll is hard, the sheet will be thought to be hard, and purchase cannot be encouraged. Therefore, by improving the softness of the roll, the sales promotion effect can be enhanced.

Regarding the toilet roll 1 of the present invention, the roll mass per roll width of 114 mm is preferably 180 g or more and 480 g or less, more preferably 225 g or more and 400 g or less, excluding the mass of the core (paper tube). It is preferably 250 g or more and 340 g or less, more preferably. By keeping the roll mass within the above range, the winding density of the toilet roll 1 is maintained within a suitable range, the softness of the toilet paper 1x is improved, and the embossed pattern 2 is crushed. Therefore, the tactile sensation and cosmetic properties of the toilet paper 1x are maintained satisfactorily. When the roll width is other than 114 mm, the roll mass is converted as 114 mm by proportional calculation.

[Core (paper tube) outer diameter]
Further, the outer diameter of the core, which is the outer diameter of the core of the toilet roll 1 of the present invention, is preferably 25 mm or more and 48 mm or less, more preferably 35 mm or more and 46 mm or less, and 37 mm or more and 43 mm or less. More preferred. When the outer diameter of the core is within the above range, the roll density and roll diameter of the toilet roll 1 can be suitably maintained, and the toilet roll 1 can be easily accommodated in the toilet paper holder. Further, the mass of the core of the toilet roll 1 is preferably 3.1 g or more and 6.9 g or less, more preferably 3.9 g or more and 5.9 g or less, and 4.4 g or more and 5.2 g or less. is more preferred. By setting the core mass within the above numerical range, it is possible to improve the strength of the core and the cost of the core suitable for the long toilet paper of the present invention. Let the mass of a core be the mass converted into roll width 114mm like roll mass.

[Specific volume]
The specific volume of the toilet paper 1x is preferably 3.0 cm ³ /g or more and 7.5 cm ³ /g or less. When the specific volume of the toilet paper 1x is within the above range, the softness of the sheet is improved, the bulk (bulkness) is preferably maintained, and the water absorbency is maintained well. The winding diameter DR does not become too large. The specific volume is more preferably 3.3 cm ³ /g or more and 6.7 cm ³ /g or less, and even more preferably 3.6 cm ³ /g or more and 6.4 cm ³ /g or less.

[DMDT, DCDT]
DMDT (Dry Machine Direction Tensile strength) is the tensile strength in the longitudinal direction when dry based on JIS P 8113 of toilet paper 1x (sheet laminated with 2 plies), DCDT (Dry Cross (Direction Tensile strength), DMDT is preferably 2.5 N/25 mm or more and 7.5 N/25 mm or less, more preferably 2.9 N/25 mm or more and 6.0 N/25 mm or less, and 3.3 N /25 mm or more and 4.5 N/25 mm or less is more preferable. DCDT is preferably 0.70 N/25 mm or more and 2.3 N/25 mm or less, more preferably 0.80 N/25 mm or more and 1.9 N/25 mm or less, and 1.0 N/25 mm or more and 1.0 N/25 mm or more. More preferably, it is 5 N/25 mm or less. When the DMDT and DCDT are within the above range, the sheet is resistant to tearing and the sheet is preferably kept soft. In addition, the measurement of the tensile strength is performed under the conditions of a tensile speed of 300 mm/min. Also, the tensile strength can be adjusted by a known method.

In the above description, the papermaking direction of the toilet paper 1x is defined as the "longitudinal direction", and the width direction is defined as the "horizontal direction".

[Water absorption]
The water absorbency of toilet paper 1x (2-ply laminated sheet) based on old JIS S 3104 is preferably 9.0 seconds or less, more preferably 6.0 seconds or less, and 3.0 seconds or less. is more preferable. The water absorbency is preferably short-term, and the water absorbency is maintained satisfactorily within the above time range. In addition, when water is dripped, it is dripped on the surface side of the toilet paper 1x.

[Ease of loosening]
The ease of unraveling based on JIS P 4501 when one sheet of toilet paper 1x is peeled off is preferably 6 seconds or more and 60 seconds or less, more preferably 10 seconds or more and 50 seconds or less, and 13 seconds or more and 40 seconds. Seconds or less is more preferable. When the ease of unraveling is within the above range, the water disintegration property in the toilet is maintained well, and the water resistance when the toilet paper 1x gets wet in the use of the warm water washing toilet seat is also good.

<toilet paper>
The toilet paper 1x may consist of 100% by mass of wood pulp, and may contain waste paper pulp, non-wood pulp, and deinked pulp. In order to obtain the target quality, the content of NBKP (softwood bleached kraft pulp) is preferably 0% by mass or more and 30% by mass or less, more preferably 0% by mass or more and 20% by mass or less. More preferably, it is 0% by mass or more and 10% by mass or less. In addition, the content of LBKP (bleached hardwood kraft pulp) is preferably 30% by mass or more and 90% by mass or less, more preferably 40% by mass or more and 80% by mass or less, and 50% by mass or more and 70% by mass or less. is more preferable.

In addition, the content of waste paper pulp derived from liquid beverages such as milk cartons (milk packs) is preferably more than 0% by mass and 60% by mass or less, more preferably 10% by mass or more and 50% by mass or less. It is more preferably 45% by mass or more, and the content of kraft pulp is preferably 40% by mass or more and 100% by mass or less, and more preferably 50% by mass or more and 90% by mass or less. More preferably, it is 55% by mass or more and 80% by mass or less.

Waste paper pulp derived from liquid beverages such as milk cartons (milk cartons) is mainly softwood pulp, and while it has the advantage of easily improving the strength of toilet paper 1x, the quality varies widely and the content ratio is too high. and product quality. By setting the content of waste paper pulp derived from liquid beverages such as milk cartons within the above range, it is possible to effectively improve the strength of the toilet paper 1x while suppressing variations in quality.

The above LBKP is preferably pulp formed from wood species belonging to the genus Eucalyptus of the family Myrtaceae, typified by Eucalyptus grandis and Eucalyptus globulus.

In the present invention, 25 parts by mass or less of deinked pulp derived from newspapers, magazines, etc. can be blended with 100 parts by mass of the waste paper pulp derived from NBKP, LBKP, and milk carton. The content of deinked pulp in toilet paper 1x (sheet) when 25 parts by mass of deinked pulp is blended is 25 parts by mass / (100 parts by mass + 25 parts by mass) x 100 = 20% by mass. . The deinked pulp content is preferably 0% by mass or more and 20% by mass or less, more preferably 0% by mass or more and 10% by mass or less, and even more preferably 0% by mass or more and 5% by mass or less. , 0% by weight. Since deinked pulp is also used paper, blending it into the pulp raw material causes large variations in the quality of the toilet paper 1x. Moreover, deinked pulp usually contains a fluorescent dye, and if the content exceeds 20% by mass, the toilet paper 1x may contain a large amount of the fluorescent dye. Therefore, the content of deinked pulp is preferably 20% by mass or less.

When the deinked pulp contains a fluorescent dye, the difference Δ between the whiteness value of toilet paper 1x (sheet) under UV-in conditions and the whiteness value under UV-cut conditions increases. Here, UV-in is a whiteness degree based on ISO 2470 when the surface side of toilet paper 1x is irradiated with C light source (including ultraviolet light) defined by CIE (International Commission on Illumination). UV-cut is the degree of whiteness according to ISO 2470 when the surface side of toilet paper 1x is irradiated with a C light source through a filter that cuts ultraviolet light with a wavelength of 420 nm or less. The difference Δ=(whiteness UV-in)−(whiteness UV-cut).

The difference Δ is preferably 0.0 points or more and 2.5 points or less, more preferably 0.0 points or more and 1.5 points or less, and 0.0 points or more and 1.0 points or less. is more preferable, and 0.0 point or more and 0.5 point or less is most preferable. The whiteness can be measured according to ISO 2470 using a high-speed spectrophotometer CMS-35SPX manufactured by Murakami Color Research Laboratory.

In order to ensure proper strength of the toilet paper 1x, the strength can be adjusted by blending the raw materials and subjecting the pulp fibers to beating treatment by a normal means. For beating to obtain the target quality, the difference in freeness before and after beating is 0 mL or more and 150 mL or less, more preferably, at the Canadian standard freeness measured by JIS P 8121 for commercially available virgin pulp. Beating treatment for reducing the volume to 10 mL or more and 100 mL or less, more preferably 20 mL or more and 70 mL or less can be mentioned.

Toilet paper 1x can be made by blending softwood kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber roughness in a specific range when a virgin raw material is used for the paper stock. Additives to paper materials include softening agents including debonder softening agents, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, absorbency Enhancers and the like can be used. It is preferred not to use wet strength agents. When waste paper raw material is used as the material for toilet paper 1x, the same treatment as in the case of the virgin system is performed.

[Toilet paper manufacturing method]
The toilet paper 1x can be manufactured, for example, in the order of (1) papermaking and creping, and (2) embossing and roll winding, as follows. Of these, (2) has already been explained, so its explanation is omitted.

(Paper making and creping)
First, a web is made from the stock on the wire part of a known paper machine and transferred to the felt of the press part. Examples of the wire part system include a round mesh system, a fourdrinier system, a suction breast system, a short mesh system, a twin wire system, and a crescent former system.

Then, the web is mechanically compressed with a suction pressure roll, a pressure roll without suction, a press roll, or the like, or dehydration is continued by adopting a dehydration method such as through-drying with hot air. Suction pressure rolls or pressure rolls without suction are also used as a means of moving the web from the press part to the Yankee dryer.

The web transferred to the Yankee dryer is dried by the Yankee dryer and the Yankee dryer hood, creped by a creping doctor, and wound on a reel part.

Creping is the mechanical compression of paper in the machine direction (the direction of sheet travel on the paper machine). Then, when the web of toilet paper 1x is manufactured, the web on the Yankee dryer is peeled off by the creping doctor and wound by the reel part, but the speed difference between the Yankee dryer and the reel part (speed of the reel part ≤ the speed of the Yankee dryer speed) causes a crepe (wrinkles) to be formed in the creping doctor.

The quality required for the toilet paper 1x, that is, bulkiness, softness, water absorbency, surface smoothness, beauty (crepe shape), etc., depend on the speed difference. Depending on conditions such as the speed difference, the basis weight of the web on the reel after creping is approximately 12 g/m ² or more and 21 g/m ^{2 or} less, which is higher than the basis weight of the web on the Yankee dryer before creping. The basis weight is preferably 14 g/m ² or more and 19 g/m ² or less, more preferably 15 g/m ² or more and 18 g/m ² or less. If the above range is exceeded, the strength may increase and the paper may become stiff or the roll softness may become too large. It may be inferior.

Here, the crepe ratio based on the speed difference between the Yankee dryer and the reel is defined by the following equation.
Crepe rate (%) = 100 x (Yankee dryer speed (m/min) - reel speed (m/min)) / reel speed (m/min)

Quality and workability are largely determined by the creping conditions, and operating conditions that optimize the creping conditions are important matters for those skilled in the art. In the present invention, the crepe rate when producing toilet paper 1x is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and further preferably 20% or more and 35% or less. preferable.

The paper thickness of the toilet paper 1x before embossing is preferably 0.50 mm/10 ply or more and 1.40 mm/10 ply or less, more preferably 0.62 mm/10 ply or more and 1.25 mm/10 ply or less, still more preferably 0 .70 mm/10 plies or more and 1.10 mm/10 plies or less. Further, the specific volume of the toilet paper 1x in the raw fabric roll 12 before embossing is preferably 3.5 cm ³ /g or more and 8.0 cm ³ /g or less, more preferably 3.8 cm ³ /g or more and 7.2 cm ^{3 /} g. g or less, more preferably 4.1 cm ³ /g or more and 6.9 cm ³ /g or less. Note that the paper thickness of the toilet paper 1x before embossing is the paper thickness of the original roll 12 . The paper thickness and specific volume before embossing are higher than those of the toilet roll. As described above, the embossed pattern 2 used in the present invention is suitable for long toilet rolls because the paper thickness and specific volume can be reduced by embossing.

For example, by using the roll winding machine 110 shown in FIG. 7, two original rolls are set, laminated into two plies, and then embossed to obtain the toilet roll 1 . It should be noted that the winding density and roll softness are measured by pressing the base paper roll 13 from the outer peripheral side when winding the wide base paper roll 13 by the winding mechanism 113 in the roll winding machine 110 shown in FIG. It can be adjusted by setting the pressing force of the rider roll 114 for the purpose within a predetermined range.

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.

The contents of the pulp composition (% by mass) were 5% NBKP, 60% LBKP, and 35% waste paper pulp derived from milk cartons, and no deinked pulp was contained. The toilet paper and toilet rolls shown were manufactured. In addition, Comparative Example 7 was manufactured without providing an embossed pattern.

The following evaluations were performed.

Dry longitudinal tensile strength DMDT and dry transverse tensile strength DCDT: Based on JIS P 8113, the maximum load until breakage for toilet paper (2-ply laminated sheet) is measured in units of N/25 mm. measured in The tensile strength was measured under the condition of a tensile speed of 300 mm/min.

Basis weight: Measured based on JIS P8124 and converted to one ply.

Paper thickness: Measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions were a measurement load of 3.7 kPa and a probe diameter of 30 mm. The measurement was repeated 10 times using a sample of 10 plies of toilet paper sheets (5 sets of 2-ply toilet paper sheets per set), and the measurement results were averaged. The paper thickness of the original web can be measured in the same manner.

Specific volume: The paper thickness per ply was divided by the grammage per ply, and expressed in volume cm ³ per unit g.

Roll winding diameter DR, core outer diameter DI: Measured using a diameter meter rule manufactured by Muratec KDS Co., Ltd. Ten rolls were measured and the measurement results were averaged.

The winding density of the roll, the inclination of the line connecting the center of gravity of the embossed pattern with respect to the line parallel to the machined direction, the area ratio and depth of the embossed pattern, and the roll density were measured by the methods described above. The winding density of the roll was obtained by measuring 10 rolls used for measuring the winding diameter DR of the roll and averaging the measurement results. In the table, when the depth of the embossed pattern is less than 0.01 mm, it is indicated by a hyphen.

Winding length: The length of 10 sheets was actually measured between the perforations of the toilet roll. After that, the number of roll sheets was actually measured, and the winding length was obtained by proportional calculation from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 2.275 m and the number of sheets is 330, then 2.275 m×(330/10)=75 m. In addition, when there was no perforation, the winding length was obtained by actual measurement.

Roll Mass: Roll mass was measured using an electronic balance. First, the mass of the roll containing the core was measured, and then the mass of the core was measured. The mass of the core was subtracted from the mass of the roll including the core to obtain the mass of the roll. The roll mass was measured for 10 rolls and the measurement results were averaged. When the roll width was different from 114 mm, the roll mass was obtained by converting the roll width to 114 mm. For example, when the roll width is 105 mm, the mass obtained by multiplying the roll mass by a coefficient (114/105) was taken as the roll mass per roll width of 114 mm.

Sensory evaluation was performed by 20 monitors. Evaluation criteria were performed on a scale of 5 points. It is good if the evaluation criteria is 3 points or more.
Each measurement was carried out after maintaining an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1° C., 50±2% RH).

The obtained results are shown in Tables 1 and 2. In addition, in Table 2, when the depth of the embossed pattern is less than 0.01 mm, a hyphen is used.

As is clear from Tables 1 and 2, in the case of each example in which the roll length, roll diameter, and area ratio of the embossed pattern of the toilet roll are within the predetermined ranges, the tactile feel and aesthetic appearance during use were obtained without lowering the basis weight. It was possible to maintain the properties and increase the winding length per roll.

1 toilet roll 1a roll surface 1b roll back surface 1e edge of the outermost roll of toilet paper 1x toilet paper 12 original roll 13 base paper roll 110 roll winding machine 111 embossing roll 112 rubber roll 113 winding mechanism 114 rider roll 2 embossing pattern 21 Auxiliary emboss pattern MD Flow direction W Width direction DR Roll diameter DI Core outer diameter

Claims (5)

A toilet roll obtained by winding two-ply toilet paper with an embossed pattern into a roll, having a roll length of 63 m or more and 128 m or less, a roll diameter of 103 mm or more and 151 mm or less, and an embossed pattern area ratio of 25. % or more and 80% or less. lines connecting the centers of gravity of the embossed patterns in the flow direction and the width direction are substantially linear,
2. The toilet roll of claim 1, wherein adjacent embossed patterns are spaced apart in the width direction greater than in the machine direction. 3. The toilet roll according to claim 2, wherein the inclination of a line connecting the centers of gravity of the embossed patterns in the flow direction with respect to a line parallel to the flow direction is 0[deg.] or more and 10[deg.] or less. Having an auxiliary embossed pattern between the embossed patterns adjacent in the width direction,
The toilet roll according to claim 2 or 3, wherein the embossed pattern and the auxiliary embossed pattern form a substantially comma shape or a substantially inverted comma shape. The toilet roll according to any one of claims 1 to 4, wherein the embossed pattern has a depth of 0.01 mm or more and 0.34 mm or less.

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