JP6784968B2 - Toilet paper and toilet paper quality evaluation method - Google Patents

Description

The present invention relates to toilet paper and a quality evaluation method thereof.

In toilet paper, embossing is performed by embossing in order to improve the softness, increase the thickness to enhance the fluffy feeling and absorbency, and to give a design. In addition, the embossing improves the wiping property.

As a typical example of embossing of toilet paper, only an embossed recess is formed on one surface of the paper surface by embossing extruding from one surface of the toilet paper to the other side, and the other surface corresponds to the embossed recess. Only the embossed protrusions (that is, projecting to the opposite side so as to form the embossed recesses) are formed. There is known a single embossing having only an embossed recess on one surface and only an embossed protrusion corresponding to the embossed recess on the other surface (see, for example, Patent Document 1). The single embossing can be applied regardless of whether the toilet paper is a 2-ply (two base paper laminated) type or a one-ply (only one base paper) type, and is widely used as a simple form.

However, the toilet paper with single embossing has a surface on which the embossed convex portion protrudes, and if the embossing is applied too deeply for the purpose of improving the design and wiping property, the surface having the embossed convex portion becomes rough. Feeling, consumers often do not rate it as a soft texture.

Japanese Unexamined Patent Publication No. 2012-170659 Japanese Unexamined Patent Publication No. 2014-0732420 Japanese Unexamined Patent Publication No. 2012-013510 Japanese Unexamined Patent Publication No. 2010-022480

Therefore, a main object of the present invention is to achieve both improvement in designability and wiping property and prevention of roughness of a surface having an embossed convex portion in a toilet paper having a single emboss.

The means for solving the above problems and their actions and effects are as follows.
<Invention according to claim 1>
The basis weight per base paper is 14 to 26 g / m ² .
It is a single embossed form in which only the embossed concave portion is formed on one surface and only the embossed convex portion corresponding to the embossed concave portion is formed on the other surface.
On one surface, the depth 0.3 to 1.0 mm, a square bottom shape, only the embossed depressions is a bottom area of 1 to 2.5 mm ² is embossed density 30000-300000 pieces / m ² and It is formed with a bottom area ratio of 3 to 25%, and only the embossed convex portion corresponding to the embossed concave portion is formed on the other surface.
The bottom shape is embossed depressions rectangle are staggered, it is square valley groove extending from the bottom to the radially square of that of the embossed depression so as to connect the bottom portions of the embossed depressions adjacent formation, The MD-direction center spacing and the CD-direction center spacing of the bottom of the embossed recess are 4.5 to 5.5 mm, respectively.
And, arithmetic average height Sa on the surface having the embossed depressions is 0.020～0.032Mm,
The elongation rate in the MD direction is 15 to 23% ,
The ratio of the arithmetic mean height Sa to the maximum mountain height Sp on the surface having the embossed recess is 22.0 to 33.0%, and the arithmetic mean height with respect to the maximum valley depth Sv of the surface having the embossed recess. The ratio of Sa is 5 to 15%,
Toilet paper that features that.

(Action effect)
In the toilet paper having the basis weight to which the single embossing is applied, if the arithmetic mean height Sa on the surface having the embossed recess is within the above range and the elongation rate in the MD direction is within the above range, the embossing is performed. It is firmly formed and has excellent design and wiping properties, but it also prevents the surface having the embossed convex portion from being rough.
The depth of the embossed recess, the bottom area, the embossing density, and the bottom area ratio are measured by setting a region of 5 cm in the MD direction × the entire width in the CD direction at an arbitrary place where there are no perforations or scratches on the toilet paper. In the case of a toilet roll, the measurement area is set at any location (for example, 5 m inside from the roll tail seal) except the outer circumference of the roll, and there is no perforation or scratches, and one measurement area is set for each roll. Measure with. The depth and bottom area of the embossed recesses are measured by arbitrarily selecting 100 embossed recesses and taking the average value. The embossing density is obtained by dividing the total number of embossed recesses included in the measurement area by the area of the measurement area and converting it per 1 m ² . The bottom area ratio can be obtained by multiplying the embossing density by the bottom area (the above-mentioned average value).
The arithmetic mean height Sa is defined in ISO25178, and is measured for an evaluation region of 24 mm in the MD direction and 18 mm in the CD direction, which has the highest embossing density. The evaluation area is set so that 10 or more embossed recesses are inserted. In the case of a toilet roll, the evaluation area is set at an arbitrary location (for example, 5 m inside from the roll tail seal portion) except the outer peripheral portion of the roll, where there are no perforations or scratches. The number of evaluation areas in the toilet paper to be evaluated is not particularly limited in principle of the arithmetic height Sa, and the measurement result at one place per product unit (for example, one roll of the toilet roll) can be used as the measurement value. It may be measured at a plurality of locations (particularly 10 locations are desirable) and the average value may be used as the measured value. Both a contact type measuring device and a non-contact type measuring device can be used for measuring the arithmetic mean height Sa, but the non-contact type is preferable, for example, a one-shot 3D measuring microscope manufactured by KEYENCE CORPORATION. It can be measured by using the VR-3000 series.
The elongation rate is the amount of elongation per unit length when a tensile force is applied in the longitudinal direction, which is the MD direction, until the toilet paper breaks. The measurement is performed according to the tensile elongation at break in JIS P 8113. The size of the sample is 25 mm in width and 150 mm in length, and even when two plies or more are used, the sample is measured in a laminated state. As the measuring device, for example, "Universal Tensile Compression Tester TG-200N" manufactured by Minebea Co., Ltd. can be used.

Furthermore, the present invention is suitable for a form in which single embossing is imparted in such a pattern.

Further, it is more preferable that the ratio of the arithmetic mean height Sa to the maximum mountain height Sp and the ratio of the arithmetic mean height Sa to the maximum valley depth Sv are within the above ranges because the uniformity of the embossed recesses is high. The maximum mountain height Sp and the maximum valley depth Sv are also defined in ISO25178, and are measured in the same manner as the above-mentioned arithmetic mean height Sa.

<Invention according to claim 2 >
Only a large number of embossed recesses are formed on one surface at intervals, and only the embossed protrusions corresponding to the embossed recesses are formed on the other surface, and the bottom surface shape of the embossed recesses is quadrangular. There are staggered, and said bottom valley groove extending radially in all directions of its from the bottom of a square of each of the embossed depressions so as to connect each other embossed depressions adjacent is formed, in the form of a single embossed toilet It is a paper quality evaluation method,
The arithmetic mean height Sa on the surface of the toilet paper having the embossed recess and the elongation rate of the toilet paper were measured.
When the measured arithmetic mean height Sa is in the range of 0.020 to 0.032 mm and the elongation rate is in the range of 15 to 23%, the embossing is firmly formed, and the design and wiping property are improved. It is judged that it is excellent and the surface having the embossed convex part is less rough.
A method for evaluating the quality of toilet paper, which is characterized by this.

(Action effect)
Since the arithmetic mean height Sa can measure the state of unevenness due to the embossed recesses for the entire evaluation area that is wide to some extent by measuring data in both directions of XY, the quality of embossing does not vary depending on the measurement location, direction, or the measurer. (That is, designability) can be evaluated accurately. The measurement of the arithmetic mean height Sa is as described above, and the number of evaluation areas in the toilet paper to be evaluated can be measured at one point per product unit (for example, one roll of the toilet roll). Further, it may be measured at a plurality of locations (particularly 10 locations are desirable) and the average value may be used as the measured value.

Further, by using the elongation rate as an evaluation standard, it is possible to accurately evaluate whether or not it is possible to achieve both improvement in designability and wiping property and prevention of roughness of the surface having the embossed convex portion.

As described above, according to the present invention, although the toilet paper has a single emboss, it has advantages such as improvement in designability and wiping property and prevention of roughness of the surface having the embossed convex portion.

It is a partial plan view which shows the embossing pattern of the toilet paper. 2 is a sectional view taken along line AA, a sectional view taken along line BB, and a sectional view taken along line CC of FIG. It is a partial plan view which shows the embossing pattern of the toilet paper. It is a figure which shows the enlarged view of the X part of FIG. 4, and the schematic cross section thereof. It is a top view which shows the embossing pattern of the toilet paper. It is a top view which shows the embossing pattern of the toilet paper. It is a top view which shows the embossing pattern of the toilet paper. It is a top view which shows the embossing pattern of the toilet paper. It is a top view which shows the embossing pattern of the toilet paper. It is a top view which shows the embossing pattern of the toilet paper. It is the schematic of the toilet paper roll.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<About toilet paper>
1 and 2 show a partial plane and cross section of the toilet paper 10. In this toilet paper 10, only the embossing recess 20 is formed on one surface by embossing extruding from one surface (front surface of FIG. 1) to the opposite side, and the other surface corresponds to the embossing recess 20 (that is, embossing). Only the embossed convex portion 30 (protruding to the opposite side so as to form the recess of the concave portion 20) is formed. Such a single embossing is preferably formed by a steel rubber type embossing apparatus composed of a metal embossing roll and an elastic roll that receives the metal embossing roll. In that case, the linear pressure between the rolls is preferably 5 to 30 kg / cm.

The toilet paper 10 may be 1 ply (only one base paper) or 2 to 4 plies (2 to 4 base papers laminated). In particular, the one-ply one is thin and has no stiffness, so it is preferable to apply the present invention.

The basis weight of the toilet paper 10 per base paper is 14 to 26 g / m ² . The paper thickness of 10 tons per base paper can be about 100 to 350 μm. The basis weight is based on the basis weight measurement method of JIS P 8124 (1998), and the paper thickness is adjusted sufficiently under the conditions of JIS P 8111 (1998), and then the dial thickness gauge (dial thickness gauge) under the same conditions. Thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Seisakusho) is used to measure any five different points, and the average value of the measured values at these five points. If the basis weight is less than this range, sufficient dry tensile strength cannot be obtained, and if it exceeds this range, it becomes too hard even in consideration of softening by embossing, which is not preferable as toilet paper.

The depth 20d of the embossed recess 20 is within the range of 0.3 to 1.0 mm. If the embossed recess 20 is too deep, the surface having the embossed convex portion 30 becomes rough, and if it is too shallow, the design becomes insufficient.

Area of the bottom portion 21 of the embossed depression 20 is in the range of 1 to 2.5 mm ^2, embossing density of the embossed depressions 20 is from 30,000 to 300,000 pieces / m ^2, is preferably a 40000-150000 pieces / m ^2, the embossed depressions The area ratio of the bottom 21 of 20 (the area of the bottom 21 per unit area) is 3 to 25%, preferably 3 to 20%. When it is out of this range, even if the arithmetic mean height Sa and the elongation rate, which will be described later, are within the range of the present invention, both the improvement of designability and wiping property and the prevention of roughness of the surface having the embossed convex portion are compatible. Becomes difficult. The area of the bottom of the embossed recess 20 is the area in a plan view from the surface side having the embossed recess 20.

Characteristically, the arithmetic mean height Sa on the surface having the embossed recess 20 is 0.020 to 0.032 mm. The arithmetic mean height Sa can be adjusted mainly by the depth 20d of the embossing recess 20 and the linear pressure between the rolls when embossing is performed.

The elongation rate of the toilet paper 10 in the MD direction is 15 to 23%, preferably 16 to 21%. If the elongation rate of the toilet paper 10 is lower than 15%, it is easily torn when wiped, and if it is higher than 23%, the wiping property is lowered even within the range of the above arithmetic mean height Sa. It is presumed that this decrease in wiping property is due to the paper stretching during wiping and the unevenness of the embossing being crushed. The MD direction is a flow direction in the papermaking process, and is a direction perpendicular to the extending direction of the crepe peaks and valleys in the crepe paper (base paper) constituting the toilet paper 10. The CD direction is a direction orthogonal to the MD direction, and in the case of crepe paper, it is the extending direction of the crepe peaks and valleys.

Since the elongation rate of each toilet paper 10 is mainly due to the crepe of the base paper, it can be adjusted by the crepe rate at the time of sheet production. The crepe rate can be appropriately selected, but in order to obtain the above elongation rate, the crepe rate is preferably 18 to 23%. If it is less than this range, sufficient elongation may not be obtained, and the paper may be cut off during processing. If it exceeds this range, the surface may be rough, which is not preferable as the toilet paper 10. The crepe ratio is a value calculated by ((Yankee dryer peripheral speed) − (winding reel peripheral speed)) / (Yankee dryer peripheral speed) × 100 (%).

In the toilet paper 10 having the basis weight to which the single embossing is applied, if the arithmetic mean height Sa on the surface having the embossed recess 20 is within the above range and the elongation rate in the MD direction is within the above range, The unevenness of the embossing is firmly formed, and while it is excellent in design and wiping property, the surface having the embossed convex portion 30 is also prevented from being rough.

In particular, the ratio of the arithmetic mean height Sa to the maximum mountain height Sp on the surface having the embossed recess 20 is 15 to 40%, more preferably 20 to 35%, and the maximum valley depth Sv on the surface having the embossed recess 20. The ratio of the arithmetic mean height Sa to 5 to 15%, more preferably 5 to 10%, is more preferable because the uniformity of the embossed recess 20 is high.

The shape of the bottom 21 of the embossed recess 20 of the present invention is a quadrangle as shown in FIG. Various shapes are also shown as reference examples in FIGS. 3, 5 and 10. In particular, a polygon such as a quadrangle is particularly suitable for applying the present invention because the roughness of the surface having the embossed convex portion 30 tends to be a problem. Further , as shown in FIG. 10, a body in which embosses having different bottom shapes are combined is also shown as a reference example. However, it is desirable to use a form in which only a single bottom-shaped emboss is applied, as in the forms shown in FIGS. 1, 3, 5 and 9.

The arrangement of the embossed recesses 20 is staggered as shown in FIG. In addition , as shown in FIGS. 3 and 5, a large number of rows of embossed recesses 20 extending in a wavy shape in the MD direction are repeated in parallel with the CD direction, and as shown in FIGS. 6 to 9. The embossed recesses 20 in which the embossed recesses 20 are arranged so as to form a constant planar shape are repeated in the MD direction and the CD direction, or the embossed recesses 20 extend linearly in the MD direction as shown in FIG. A form in which the rows of the above are repeated in parallel in the CD direction is also shown as a reference example, but among them, a pattern in which the embossed recesses 20 are arranged at a uniform embossing density as shown in FIG. 1 and the like is preferable.

In particular, as shown in FIG. 1, the embossed recesses 20 are arranged in a staggered pattern, and valley grooves extending radially from the bottom portion 21 of each embossed recess 20 so as to connect the bottom portions 21 of the adjacent embossed recesses 20 are formed. The formed form is preferable. In this case, the area of the bottom 21 of the embossed recess 20 is 1 to ^2.5 mm ^2, and the center spacing L9 in the MD direction and the center spacing L9 in the CD direction of the bottom 21 of the embossed recess 20 are 4.5, respectively. It is preferably about 5.5 mm. When the shape of the bottom 21 of the embossed recess 20 is a quadrangle as shown in the illustrated figure, the dimensions of each side of the quadrangle and the diagonal direction of the bottom 21 coincide with the diagonal direction of the adjacent recess. It is desirable to determine the arrangement of the embossed recesses 20 because the shape of the valley groove connecting the adjacent embossed recesses 20 is neatly formed. Further, when the embossed recesses 20 are arranged in a staggered pattern, the acute angle side crossing angle B between the direction passing through the center of the adjacent embossed recesses 20 and the CD direction is preferably 40 ° to 50 °.

The toilet paper 10 of the present embodiment can be formed by embossing a known crepe paper for toilet paper 10, but the raw material pulp of the crepe paper is not particularly limited, and used paper pulp may be blended. From the viewpoint of softness, it is preferable to use only virgin pulp as a pulp raw material, and in that case, a mixture of NBKP (coniferous kraft pulp) and LBKP (hardwood kraft pulp) is particularly preferable. The blending ratio (JIS P 8120) is preferably NBKP: LBKP = 0: 100 to 20:80. If the amount of NBKP is too small, sufficient dry tensile strength cannot be obtained.

It is desirable that the dry tensile strength per base paper of the toilet paper 10 is 100 to 380 cN in the vertical direction (MD direction) and 70 to 170 cN in the horizontal direction (CD direction). If it is lower than this range, the sheet will be torn during wiping, and if it is higher than this range, it will become too hard, which is not preferable.

It is necessary to ensure the water solubility of the toilet paper 10 of the present embodiment, and the result of the water solubility in the test method of looseness specified in JIS P 4501 is preferably 3 to 30 seconds.

The toilet paper 10 is suitable for forming a toilet roll 100 as shown in FIG. As shown in the figure, the toilet roll 100 includes a type wound around a tube core 101, which is also called a paper tube, and a coreless type without a tube core, and can be applied to both types. In the toilet roll 100 shown in FIG. 11, the embossed recess 20 is shown only at the tip end portion, but the embossed recess is formed over the entire length of the toilet roll 100. The outer shape of the toilet roll 100 is generally 100 to 125 mm in diameter (sometimes referred to as winding diameter or outer diameter) L4, 105 to 120 mm in roll width (same as paper width), and inner diameter (inner diameter (sometimes referred to as winding diameter or outer diameter)). If it has a paper tube, its diameter) L5 is 35 to 50 mm, and the toilet paper 10 can also be a toilet roll 100 having such an outer shape. In the general toilet roll 100, the longitudinal direction of the toilet paper 10 is the vertical direction (MD direction) of the paper, and the width direction is the horizontal direction (CD direction). The winding length of the toilet roll 100 can be appropriately determined, but in the case of the above diameter and 1 ply, it may be, for example, 45 to 100 m, and in the case of the above diameter and 2 plies, it may be, for example, 25 to 50 m. Can be done.

<About the quality evaluation method of toilet paper>
In the above-mentioned toilet paper 10, the arithmetic mean height Sa changes depending on the quality of embossing. Therefore, in addition to measuring the arithmetic mean height Sa of the toilet paper product, we also propose a method of evaluating the quality of the toilet paper 10 based on whether or not the measured arithmetic mean height Sa is within the reference range. Since the arithmetic mean height Sa can measure the state of unevenness due to the embossed recesses for the entire evaluation area that is wide to some extent by measuring data in both directions of XY, the quality of embossing does not vary depending on the measurement location, direction, or the measurer. (That is, designability) can be evaluated accurately.

Furthermore, when the elongation rate of the toilet paper product is measured together with the arithmetic mean height Sa, and the quality of the toilet paper 10 is evaluated based on whether or not both the arithmetic average height Sa and the elongation rate are within the standard range, the design quality is evaluated. It is possible to accurately evaluate whether or not the improvement in wiping property and the prevention of roughness of the surface having the embossed convex portion can be achieved at the same time.

For the toilet paper of the example of the present invention and the toilet paper of the comparative example, the MMD which is an index of smoothness is measured as described below, and the surface having the embossed convex portion is rough and the design of the surface having the embossed concave portion is formed. A sensory test was conducted on the properties and wiping properties, and a wiping test that imitated actual wiping was performed.

For MMD, the friction coefficient was measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.), and the value obtained by dividing the friction coefficient by the friction distance (moving distance = 2 cm) was taken as the MMD value.

The arithmetic mean height Sa, maximum mountain height Sp, and maximum valley depth Sv of each example were measured by a one-shot 3D measurement microscope VR-3000 series manufactured by KEYENCE CORPORATION.

The sensory evaluation of "roughness of the surface with embossed protrusions" was conducted on 10 users, and each person was given a feeling of roughness when using the toilet paper of each example as usual, "good" or "which". It was decided to have them evaluated on a three-point scale of "not good" and "bad". When 7 to 10 people answered "good", it was evaluated as ○, when 4 to 6 people, it was evaluated as Δ, and when 0 to 3 people, it was evaluated as ×.

For the sensory evaluation of "wiping property", 10 users were used as subjects, and each person was asked to wipe the buttocks with the toilet paper of each example as usual, and "cleanly wiped" and "wipe off" at one time. It was decided to have them evaluated on a three-point scale of "there is a wiping residue". The number of people who answered "cleanly wiped off" was evaluated as ◯ for 7 to 10 people, Δ for 4 to 6 people, and x for 0 to 3 people.

For the sensory evaluation of "design", 10 users were used as subjects, and each person was asked to look at the toilet paper of each example, and "embossed clearly", "embossed", and "embossed blurry". It was decided to have them evaluated on a three-point scale. When 7 to 10 people answered that "the embossing is clearly included", it was evaluated as ○, when 4 to 6 people were evaluated as Δ, and when 0 to 3 people were evaluated as ×.

In the "laboratory wiping test", 0.07 g of starch glue (FC10 manufactured by Fukui Glue Industry Co., Ltd.) was applied to the acrylic board, and the starch glue was wiped off as if it were stool. , "Wipe off" was marked with Δ, and "There was wiping residue" was marked with x, and the wiping condition was evaluated on a three-point scale.

The specifications for embossing the toilet paper in each example are as follows, which are common to all cases.
-Embossed pattern: Fig. 1 (staggered)
-Shape of bottom 21 of embossed recess 20: Square-Dimensions of bottom 21 of embossed recess 20: 1.25 mm in MD direction x 1.0 mm in CD direction
Area of bottom 21 of embossed recess 20: 1.25 mm ²
・ Embossing density: 75,000 pieces / m ²
-Bottom 21 area ratio of embossed recess 20: 9.375%
-Center distance L9: 5.50 mm in the MD direction of the bottom 21 of the embossed recess 20
-Center spacing of the bottom 21 of the embossed recess 20 in the CD direction L9: 5.01 mm
-Embossed pattern: Fig. 6 (dot-shaped, Example 4)
-Bottom shape of embossed recess 20: oval-Bottom dimensions of embossed recess 20: 2.00 mm in MD direction x 1.0 mm in CD direction
-Area of the bottom 21 of the embossed recess 20: 1.57 mm ²
・ Embossing density: 120,000 pieces / m ²
-Bottom area ratio of embossed recess 20: 18.840%
-Center spacing of the bottom of the embossed recess 20 in the MD direction: 5.00 mm
-Center spacing of the bottom of the embossed recess 20 in the CD direction: 4.50 mm

Other physical property values and test results are shown in Table 1 below.

As shown in Table 1, Examples 1 to 3 of the present invention can achieve both improvement in designability and wiping property and prevention of roughness of the surface having the embossed convex portion, whereas Comparative Examples 1 to 1 In No. 4, it was not possible to achieve both improvement in design and wiping property and prevention of roughness of the surface having the embossed convex portion. From the wiping test in the laboratory, it was found that the clearer the embossing is, the larger the unevenness of the embossing is, and the pressure on the part that hits the skin increases, so that the embossing tends to be wiped cleanly. In addition, the glue tended to be trapped in the recess. On the other hand, it was found that when the paper stretches high, the embossing is crushed when the paper is wiped, so that the paper cannot be wiped cleanly.

10 ... Toilet paper, 20 ... Embossed concave, 30 ... Embossed convex, 21 ... Bottom, 100 ... Toilet roll.

Claims (2)

The basis weight per base paper is 14 to 26 g / m ² .
It is a single embossed form in which only the embossed concave portion is formed on one surface and only the embossed convex portion corresponding to the embossed concave portion is formed on the other surface.
On one surface, the depth 0.3 to 1.0 mm, a square bottom shape, only the embossed depressions is a bottom area of 1 to 2.5 mm ² is embossed density 30000-300000 pieces / m ² and It is formed with a bottom area ratio of 3 to 25%, and only the embossed convex portion corresponding to the embossed concave portion is formed on the other surface.
The bottom shape is embossed depressions rectangle are staggered, it is square valley groove extending from the bottom to the radially square of that of the embossed depression so as to connect the bottom portions of the embossed depressions adjacent formation, The MD-direction center spacing and the CD-direction center spacing of the bottom of the embossed recess are 4.5 to 5.5 mm, respectively.
And, arithmetic average height Sa on the surface having the embossed depressions is 0.020～0.032Mm,
The elongation rate in the MD direction is 15 to 23% ,
The ratio of the arithmetic mean height Sa to the maximum mountain height Sp on the surface having the embossed recess is 22.0 to 33.0%, and the arithmetic mean height with respect to the maximum valley depth Sv of the surface having the embossed recess. The ratio of Sa is 5 to 15%,
Toilet paper that features that. Only a large number of embossed recesses are formed on one surface at intervals, and only the embossed protrusions corresponding to the embossed recesses are formed on the other surface, and the bottom surface shape of the embossed recesses is quadrangular. There are staggered, and said bottom valley groove extending radially in all directions of its from the bottom of a square of each of the embossed depressions so as to connect each other embossed depressions adjacent is formed, in the form of a single embossed toilet It is a paper quality evaluation method,
The arithmetic mean height Sa on the surface of the toilet paper having the embossed recess and the elongation rate of the toilet paper were measured.
When the measured arithmetic mean height Sa is in the range of 0.020 to 0.032 mm and the elongation rate is in the range of 15 to 23%, the embossing is firmly formed, and the design and wiping property are improved. It is judged that it is excellent and the surface having the embossed convex part is less rough.
A method for evaluating the quality of toilet paper, which is characterized by this.

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