JP6851880B2 - Manufacture method of sanitary tissue paper and sanitary tissue paper - Google Patents

Description

The present invention relates to a method for producing sanitary tissue paper and sanitary tissue paper, and more particularly to a method for producing embossed sanitary tissue paper and embossed sanitary tissue paper.

Sanitary tissue paper such as toilet paper, kitchen paper, tissue paper, and paper towels are made with a low basis weight for their softness, but on the other hand, they are required to have a sense of thickness and bulkiness during use. Embossing is one of the means to improve the bulkiness and thickness of sanitary tissue paper.

By embossing, unevenness is formed on the paper surface to improve the thickness and bulkiness. Further, as shown in Patent Document 1 below, there is also a technique for increasing a feeling of thickness and bulkiness by embossing to give two types of recesses having different depths.

However, if the unevenness due to the conventional embossing is not sufficiently bulky or if it is rolled into a roll for commercialization, the unevenness given by the embossing may be crushed and the bulkiness and the feeling of thickness may be impaired. ..

By firmly forming the unevenness by increasing the pressure during embossing, it is possible to improve the crushing of the unevenness, but when embossing is performed at high pressure in this way, the stiffness is reduced and the paper is easily torn. In addition, the recesses may become hard and the softness and texture required for sanitary tissue paper may decrease.

Japanese Patent Application Laid-Open No. 2008-180871

Therefore, a main object of the present invention is to provide a sanitary tissue paper having the softness and texture required for the sanitary tissue paper, the unevenness is not crushed, and the sanitary tissue paper is excellent in bulkiness and thickness, and a method for producing the sanitary tissue paper.

The means for solving the above problems are as follows.
The first means is
Sanitary tissue paper with recesses formed by embossing.
A sanitary tissue paper characterized by having a circular or elliptical shape with no corners and a non-pressing portion having an area of 13 to 35% of the area of the bottom in the central portion of the bottom of the recess.

The second means is
It is a method of manufacturing sanitary tissue paper.
Base paper having a vertical dry tensile strength of 1,000 to 3,500 cN / 25 mm and a horizontal dry tensile strength of 400 to 2,000 cN / 25 mm, or
Base paper having a vertical dry tensile strength of 150 to 1,000 cN / 25 mm and a horizontal dry tensile strength of 50 to 400 cN / 25 mm, or
Base paper with a vertical dry tensile strength of 1,000 to 3,500 cN / 25 mm and a horizontal dry tensile strength of 300 to 2,500 cN / 25 mm.
It has an embossing step of pressing a convex portion for embossing against the above to form a concave portion corresponding to the convex portion for embossing, and the convex portion for embossing has a top surface area at the center of the top surface. It has an area of 13-35%, is circular or elliptical with no corners, and has recesses with a depth of 10-70% of the height of the protrusions.
This is a method for producing sanitary tissue paper.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a sanitary tissue paper having the softness and texture required for the sanitary tissue paper, the unevenness is not crushed, and the hygienic tissue paper is excellent in bulkiness and thickness, and a method for producing the sanitary tissue paper.

It is a top view for demonstrating the concave part by the embossing of the sanitary tissue paper which concerns on this invention, and also shows the enlarged view of the part A. FIG. 1 is a cross-sectional view taken along the line II of FIG. It is sectional drawing for demonstrating the convex part of the embossed roll which concerns on this invention. It is a figure for demonstrating the example of the embossing processing which concerns on this invention. It is a figure which shows the plane and the cross section of the convex part of the embossed roll which concerns on Comparative Example 1. FIG. It is a figure which shows the plane and the cross section of the convex part of the embossed roll which concerns on Comparative Example 2. It is a figure which shows the plane and the cross section of the convex part of the embossed roll which concerns on Comparative Example 3. It is a figure which shows the plane and the cross section of the convex part of the embossed roll which concerns on Comparative Example 5. It is a photographed image of the sanitary tissue paper which concerns on this invention by a laser microscope.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a plan view for explaining the sanitary tissue paper of the present embodiment, and also shows an enlarged view of a portion A. FIG. 2 is a cross-sectional view taken along the line II of FIG.

The sanitary tissue paper 1 of the present embodiment has a large number of concave portions 11 formed on one surface and a large number of convex portions 12 corresponding to the large number of concave portions 11 on the other surface.

The recess 11 is formed by embossing by pressing the embossing convex portion formed on the surface portion of the embossing roll or the embossing plate against the base paper. For example, as shown in FIG. 3, a base paper is passed between a metal embossing roll 20 having a large number of embossing convex portions 22 formed on the surface thereof and an elastic roll 30 in contact with the metal embossing roll 20 at a predetermined linear pressure. It can be formed by embossing a steel rubber type. The linear pressure between the rolls and the surface hardness of the elastic rolls during embossing may be appropriately adjusted by a known technique depending on the physical characteristics and composition of the base paper to be embossed. Although not limited to the present invention, in the case of sanitary tissue paper such as kitchen paper and toilet paper, the linear pressure between the rolls is about 5 to 30 kg / cm, and the surface hardness of the elastic roll (Shore hardness). Is about 40 to 70.

Here, the sanitary tissue paper 1 of the present embodiment characteristically has a non-pressing portion 14 having an area of 13 to 35% of the area of the bottom portion 13 at the central portion of the bottom portion 13 of the recess 11 . The area of the bottom portion 13 is the area of the entire bottom portion of one recess 11 including the range of the non-pressing portion 14 when the sanitary tissue paper is viewed in a plan view. The non-pressing portion 14 is a portion that is not pressed on the top surface 23 corresponding to the bottom portion 13 of the embossing convex portion 22. Further, the central portion means a range that does not touch at least the edge of the bottom portion 13.

Such a concave portion 11 has an embossing convex portion 22 formed on the surface portion of the embossed roll or the embossed plate, and has an area of 13 to 35% of the apical surface area at the central portion of the apical surface 23, and the convex portion height It may have a recess 24 having a depth of 10 to 70%, preferably 10 to 50% of L1. The central portion means a range that does not touch at least the edge of the top surface 23. When the embossing convex portion 22 is pressed against the paper surface of the base paper, it is embossed into the top surface shape of the embossing convex portion 22 to form the bottom portion 13 of the concave portion 11 having the same shape, and the embossing convex portion 22 is formed. A part of the base paper enters the recessed portion 24 of the central portion of the top surface 23 of the portion 22, and only that portion becomes the non-pressing portion 24 that is not pressed by the top surface 23.

The non-pressing portion 14 according to the sanitary thin paper 1 of the present embodiment is a portion where the top surface 23 of the embossing convex portion 22 is not pressed in this way, and the fibers are not densely compacted. As described above, by having the non-pressing portion 14 in which the fibers are not densely compacted in the central portion of the bottom portion of the concave portion, more specifically, the central portion of the convex portion corresponding to the concave portion, the softness and the touch are sufficiently high. It becomes. On the other hand, when the fibers in the non-pressing portion 14 enter the recessed portion and the fibers around the recessed portion are strongly pressed, the fibers in the peripheral portion of the bottom 13 of the recess 11 are densely packed. It is compacted into. That is, the fibers are firmly solidified in the annular portion from the peripheral edge of the convex portion 12 corresponding to the concave portion 11 to the skirt. As a result, it is considered that the unevenness is hard to be crushed. However, as described above, regarding the relationship between the area of the bottom surface 13 of the recess 11 and the area of the non-pressing portion 14, the area of the non-pressing portion 14 is 13 to 35% of the area of the bottom portion 13. Within this range, the softness and feel are sufficient, and unevenness that is hard to be crushed is formed, and the bulkiness and thickness are excellent.

Further, in the embossing process, the shape of the convex portion 22 for the embossing process is substantially transferred to the base paper. Therefore, in order to form the concave portion 11 having the bottom portion 13 and the non-pressing portion 14, as described above, the embossing process is performed. It is assumed that the convex portion 22 has a recessed portion 24 having an area of 5 to 80%, preferably 20 to 50% of the area of the apex surface at the center of the apex surface 23. Then, the depth of the recessed portion 24 is set to 10 to 70%, preferably 20 to 50% of the height L1 of the embossing convex portion 22. With this depth, the portion of the base paper that becomes the non-pressing portion 14 can enter the recessed portion 24. Specifically, the convex portion height L1 is preferably 1.0 to 2.0 mm. Further, in the case of the convex portion height L1, the depth of the concave portion 11 is about 0.1 to 1.4 mm. The depth of the recess 11 can be measured using a shape measuring laser microscope. Examples of the shape measurement laser microscope include "One-shot 3D measurement macroscope VR-3200" manufactured by KEYENCE and its equivalent. In this case, any 5 embosses are selected, and the measured values are averaged of 5 pieces. The product name "VR-H2A" can be used as the image observation / measurement / image analysis software of the laser scope. Further, the measurement conditions may be such that the magnification is 12 times and the visual field area is 24 mm × 18 mm. The measurement magnification and the visual field area may be appropriately changed depending on the desired size of embossing. Further, by using the shape measuring laser microscope, the area of the bottom surface 13 of the recess 11 and the area of the non-pressing portion 14 can be calculated.

The shape of the bottom portion 13 of one recess 11 according to the present embodiment in a plan view is square in the illustrated embodiment, but the shape of the bottom portion 13 is not limited to the square shape. The specific shape of the bottom 13 in a plan view is not limited. For example, triangles, quadrangles, circles, ellipses and the like are exemplified as preferred bottom shapes. A quadrangle is particularly preferable. Further, the plan view shape of the recess 11 and the plan view shape of the bottom portion 13 do not necessarily have to match. That is, the shape of the top surface 23 of the embossing convex portion 22 and the shape of the contour of the outer peripheral edge of the embossing convex portion may not match.

Further, the sanitary tissue paper 1 according to the present embodiment is not limited in the pattern drawn by the plurality of recesses 13. However, it is desirable that the recesses 13 are regularly arranged. More preferably, it is preferable to have a pattern arranged at equal intervals on the left, right, top and bottom of the paper surface. In this case, the separation distance between the recess 13 and the recess 13 is preferably 2.0 to 6.0 mm. In such a pattern, since the recesses 13 are present on the entire surface of the paper, the effects of the improvement in softness and touch, and the effect of bulkiness and thickness due to the unevenness that is hard to be crushed are more exhibited.

It is desirable that a part of the base paper easily enters the recessed portion and the shape of the recessed portion 24 in the convex portion 22 for embossing according to the present embodiment is preferably a circle or an ellipse without corners.

The area of the bottom portion 13 of the concave portion 11 and the area of the top surface 23 of the corresponding embossing convex portion 22 according to the present embodiment are not limited, but are preferably 0.5 to ^{4.0 mm 2} , more preferably 0.8 to. It is 3.0 mm ^2. Within this range, the effect of the non-pressing portion 14 and its peripheral portion is fully exhibited. The area of the recess 11 when viewed directly in a plane is also not limited. The embossing convex portion 22 is generally tapered toward the top surface side so as to come out of the base paper after the embossing convex portion 22 is pressed against the base paper. Therefore, the area of the recess 11 is slightly larger than that of the bottom 13 in a plan view. In the sanitary tissue paper 1 according to the present embodiment, the difference is not limited, but in the sanitary tissue paper, the area of the recess 11 is generally in the range of 100 to 500% of the area of the bottom portion 13, and this range may be used. it can.

The number and density of the recesses 11 according to the present embodiment are not limited, but the density is preferably ^{3 to 12 pieces / cm 2.} Within this range, the effect of the non-pressing portion 14 and the peripheral portion thereof is sufficiently exhibited, and the hygienic tissue paper is sufficiently soft and excellent in touch, and the unevenness is not crushed and is felt to be excellent in bulkiness and thickness.

The bottom area ratio according to the present embodiment is also not limited, but is preferably 5 to 15%. Within this range, the effect of the non-pressing portion 14 and the recess 11 having the peripheral portion thereof is sufficiently exhibited, and the hygiene is felt to be sufficiently soft and excellent in touch, and the unevenness is not crushed and the bulkiness and thickness are excellent. It becomes thin paper. The bottom area ratio is the ratio of the total area of the bottom on one side of the paper to the total area of one side of the paper.

The sanitary tissue paper 1 of the present embodiment has a double embossed form in which the surfaces on which the convex portion 12 corresponding to the concave portion 11 is formed are faced to each other and laminated at the time of production, or a convex corresponding to the concave portion 11. It can be in any form of single embossing in which the portion 12 is exposed on the surface of the sanitary tissue paper. In the case of double embossing, an adhesive or the like may be applied to the top of the convex portion 12 to bond the sanitary tissue papers to each other. In this case, it is possible to prevent the adhesive from being applied to all the convex portions 12.

On the other hand, in the sanitary tissue paper 1, the fiber material is pulp fiber, and the pulp composition thereof is appropriately adjusted by a known technique according to the use of the sanitary tissue paper such as kitchen paper and toilet paper. For kitchen paper, it is desirable that the amount of virgin pulp is 100% by mass, and for toilet paper, waste paper pulp may be appropriately contained. Specific pulp species include softwood pulps such as NBKP (coniferous kraft pulp) and NUKP (unbleached softwood pulp), and broadleaf pulp such as LBKP (hardwood kraft pulp) and LUKP (unbleached hardwood pulp). These can be blended in an appropriate ratio, or recycled paper pulp can be further blended. These are not limited in this embodiment.

Further, the sanitary tissue paper 1 is a crepe paper having a crepe, but the crepe is not limited to a dry crepe or a wet crepe. It may have both crepes.

The basis weight of the sanitary tissue paper 1 of the present embodiment is adjusted according to the intended use. In the case of kitchen paper, it is 15 to 35 g / m ² , preferably 18 to 25 g / m ² . In the case of toilet paper, it is 12 to 25 g / m ² , preferably 14 to 22 g / m ² . In the case of tissue paper, it is 9 to 23 g / m ² , preferably 11 to 20 g / m ² . In the case of paper towels, it is 13 to 60 g / m ² , preferably 15 to 35 g / m ² . Within these ranges, it is felt that it is excellent in softness and touch, is not crushed by unevenness, and is excellent in bulkiness and thickness. The basis weight is a value measured based on JIS P 8124.

The tensile strength of the sanitary tissue paper 1 of the present embodiment is also adjusted according to the application. The tensile strength may be adjusted by adjusting the tensile strength of the base paper, and can be adjusted by adjusting the papermaking raw material, for example, by adding a dry paper strength agent or a wet paper strength agent. However, in the sanitary thin paper 1 of the present embodiment, it is desirable that the dry tensile strength of the base paper is as follows. At the time of embossing, the embossing convex portion 22 is firmly transferred to the base paper, and the concave portion 11 is surely formed. The dry tensile strength of the base paper is 1,000 to 3,500 cN / 25 mm in the vertical direction for kitchen paper, 400 to 2,000 cN / 25 mm in the horizontal direction, and 150 to 1 in the vertical direction for toilet paper. 000cN / 25mm, 50-400cN / 25mm in the horizontal direction, 150-1,000cN / 25mm in the vertical direction for tissue paper, 40-250cN / 25mm in the horizontal direction, 1,1 in the vertical direction for paper towels It is 000 to 3,500 cN / 25 mm and 300 to 2,500 cN / 25 mm in the lateral direction. Especially in the base paper for kitchen paper having a high dry tensile strength, the shape of the convex portion 22 for embossing is easily transferred firmly, and the base paper having a dry tensile strength in the above range suitable for kitchen paper is not particularly good. The effect of the recessed portion having the pressing portion 14 and the peripheral portion thereof becomes remarkable. The dry tensile strength is a value measured with a test piece having a width of 25 mm based on JIS P 8113.

On the other hand, the product aspect of the sanitary tissue paper 1 according to the present embodiment is, for example, a strip-shaped product in which perforations for division are arranged at appropriate intervals and wound around a paper tube, or a pickup type or pop-up type. Examples of folded and laminated sheet-fed kitchen paper, which is called a formula or the like, are exemplified, but these product modes are not limited. In addition, the number of plies can be set as appropriate.

Hereinafter, the sanitary tissue paper according to the present invention will be further described with reference to Examples in which the effects of the present invention have been verified.

The sanitary tissue paper according to the present invention and other sanitary tissue paper were tested for thickness / bulkiness, softness / texture. The test was carried out by measuring the thickness and bulkiness of the unembossed base paper as a reference sample, measuring the paper thickness and the paper thickness of each example as follows, and comparing them.

The paper thickness is measured by sufficiently adjusting the humidity of the test piece according to each example under the conditions of JIS P 8111 (1998), and then dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (Ozaki) under the same conditions. Measure using (manufactured by Mfg. Co., Ltd.). The specific procedure is to check that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge, and set the zero point. Then, the plunger is raised, the sample is placed on the test table, the plunger is slowly lowered, and the gauge at that time is read. At this time, only the plunger is placed. The terminal of the plunger is made of metal so that a circular plane having a diameter of 10 mm hits the paper plane perpendicularly, and the load at the time of measuring this thickness is about 70 gf at 120 μm. The thickness is an average value obtained by performing the measurement 10 times. As for the place where the paper thickness is measured, make sure that the recess fits inside the plunger terminal. In this method of measuring the paper thickness, the way the sanitary tissue paper is crushed in the thickness direction at the time of measurement differs depending on the embossing mode. Therefore, in this method of measuring the paper thickness, a thick paper has a feeling of bulkiness and thickness at the time of use because the unevenness is not easily crushed.

The softness and texture were evaluated by 20 subjects. The evaluation is a five-point evaluation, and the numerical values in the table are the values obtained by rounding off the average value of the subjects after the decimal point.

Here, in the sample according to each example, the embossed plate having the embossing convex portions shown in Tables 1 and 2 is pressed against the sanitary thin paper base paper 1, the sanitary thin paper base paper 2, and the sanitary thin paper base paper 3. The embossing convex portion was transferred by hitting and embossing was performed so as to form a concave portion. As the rubber pad paired with the embossed plate, NBR having a hardness of 70 degrees was used. The pressure at the time of pressing was 30 MPa.

The sanitary tissue paper base paper 1 used has a basis weight of 16.8 g / m ² , a vertical dry tensile strength of 330 cN / 25 mm, and a horizontal dry tensile strength of 120 cN / 25 mm. The base paper 2 for sanitary tissue paper has a basis weight of 15.5 g / m ² , a dry tensile strength in the vertical direction of 650 cN / 25 mm, and a dry tensile strength in the horizontal direction of 210 cN / 25 mm. The base paper 3 for sanitary tissue paper has a basis weight of 22.5 g / m ² , a dry tensile strength in the vertical direction of 1800 cN / 25 mm, and a dry tensile strength in the horizontal direction of 800 cN / 25 mm.

The arrangement pattern of the concave portions of Examples 1 to 6 is shown in FIG. 1, and the cross section of the convex portion for embossing is shown in FIG.

In Examples 1 to 6, the area of the top surface, the area of the recessed portion, and the like are changed. The arrangement pattern of the concave portion and the bottom portion 113 of the sample 101 of Comparative Example 1 and the cross-sectional shape of the convex portion 122 for embossing are as shown in FIG. It does not have a portion or a non-pressing portion. FIG. 5A shows an arrangement pattern of concave portions, and FIG. 5B shows a cross-sectional shape of a convex portion for embossing. Also in FIGS. 6 to 8, (A) shows the arrangement pattern of the concave portions, and (B) shows the cross-sectional shape of the convex portion for embossing.

The arrangement pattern of the concave portion and the bottom portion 113 of the sample 101 of Comparative Example 2 and the cross-sectional shape of the convex portion 122 for embossing are as shown in FIG. It does not have.

The arrangement pattern of the concave portion and the bottom portion 113 of the sample 101 of Comparative Example 3 and the cross-sectional shape of the convex portion 122 for embossing are as shown in FIG. It does not have.

The arrangement pattern of the concave portion and the bottom 113 of the sample 101 of Comparative Example 4 and the cross-sectional shape of the convex portion 122 for embossing are the same as those of Comparative Example 1, but Comparative Example 4 is embossed in Examples 2 to 6. The concave portion is not formed in the convex portion.

The arrangement pattern of the concave portion and the bottom portion 113 of the sample 101 of Comparative Example 5 and the cross-sectional shape of the convex portion 122 for embossing are as shown in FIG. Comparative Example 5 is an example in which the protrusion 124 is formed in the central portion of the embossing convex portion 122 instead of the concave portion on the top surface.

The height of the embossing convex portion in each example is the same. However, Comparative Example 5 has a height excluding the protrusion 124.

First, Example 1 and Comparative Examples 1 to 3 were compared. In Example 1 and Comparative Examples 1 to 3, the area of the top surface (the area of the bottom portion) of the convex portion for embossing is substantially the same. However, the convex portion for embossing of Example 1 has a recessed portion, and the bottom portion has a non-pressing portion. Comparative Examples 1 to 3 differ in the shape of the top surface of the convex portion for embossing.

As shown in Table 1, the paper thickness of each base paper type according to each example is increased by embossing as compared with the reference sample (base paper). However, in the paper thickness measurement by the dial thickness gauge, the paper thickness of Example 1 of the present invention was thicker than that of the comparative example in all the base papers even though the convex portions were embossed with the same height. .. In particular, as the dry tensile strength of the paper increases, the paper thickness tends to increase. In addition, Example 1 of the present invention tended to be superior in softness and texture.

From this, it is felt that the unevenness is not crushed and the bulkiness and thickness are excellent by forming a recessed portion in the center of the convex portion for embossing and forming a non-pressing portion at the bottom, and also softness and texture. It can be said that it is a sufficiently hygienic tissue paper.

Next, Examples 2 to 6 were compared with Comparative Example 5 and Comparative Example 6. Examples 2 to 6 have a recessed portion in the convex portion for embossing, but the diameter thereof is different. In Comparative Example 5, the embossing convex portion does not have a recessed portion. Comparative Example 6 is an example in which a protrusion is formed in the center instead of a depression on the top surface.

As shown in Table 2, although the convex portions for embossing have the same height, in the paper thickness measurement by the dial thickness gauge, the paper thicknesses of Examples 2 to 6 of the present invention are found in Comparative Example 4 in all the base papers. And the result was thicker than that of Comparative Example 5. In particular, as the dry tensile strength of the paper increases, the paper thickness tends to increase. It was also found that the ratio of the area of the recessed portion to the area of the top surface is effective within the scope of the present invention. Further, it was found that the paper thickness can be secured by forming the recessed portion rather than forming the protruding portion on the top surface of the convex portion for embossing as in Comparative Example 5. In addition, each embodiment of the present invention tended to be superior in softness and texture. For this reason, by forming a recess in the center of the convex part for embossing and forming a non-pressing part at the bottom, the unevenness is not crushed and it is excellent in bulkiness and thickness, and it is a hygienic thin paper with sufficient softness and texture. It can be said that.

Next, the depth of the embossed recesses according to Examples 1 to 6 and Comparative Examples 1 to 5 was measured for reference. For the measurement, "One-shot 3D measurement macroscope VR-3200" manufactured by KEYENCE was used, the sample was placed flat, 5 arbitrary embosses were selected, and the measured values were taken as an average of 5 pieces. The product name "VR-H2A" was used as the image observation / measurement / image analysis software of the laser scope. The measurement conditions are a magnification of 12 times and a visual field area of 24 mm × 18 mm. FIG. 9 shows an image at the time of measurement of the one-shot 3D measurement macroscope VR-3200 of the sanitary tissue paper according to the present invention.

As shown in Table 3, no significant difference was observed in each example in the evaluation based on the measured value of the depth of the recess of the non-contact method. That is, when combined with the results of Tables 1 and 2 above, it can be said that the examples according to the present invention have the same depth of the recesses as the comparative examples, but the irregularities are not easily crushed.

Next, the compression work amount (WC) in the thickness direction by the KES method was measured and compared between Example 2 and Comparative Example 4, which differed only in the presence or absence of the recessed portion in terms of the shape of the convex portion. It is said that the larger the value of the compression work (WC), the easier it is to be compressed. The measurement was performed using a KES-G5 handy compression tester manufactured by Kato Tech. The measurement method is as follows. A 5 cm x 5 cm test piece is prepared, attached to a test table, and the test piece is compressed between steel plates having a circular plane with an ^{area of 2 cm 2.} The compression rate is 0.01 cm / sec. The maximum compression load is 50 gf. The results are shown in Table 4.

As shown in Table 4, Example 2 has a significantly higher value of compression work (WC) than Comparative Example 4. That is, the unevenness is not easily crushed.

As shown in the results of each of the above tests, the sanitary tissue paper according to the present invention is excellent in bulkiness and thickness because the unevenness is not easily crushed.

1 ... Sanitary thin paper, 10 ... Base paper, 11 ... Concave, 12 ... Convex, 13,113 ... Bottom, 14 ... Non-pressing part, 22,122 ... Convex for embossing, 20 ... Metal embossing roll, 23 ... Embossing Top surface of the convex portion, 24 ... recessed portion, 124 ... protruding portion, 30 ... elastic roll, L1 ... convex portion height, L2 ... recessed portion depth.

Claims (2)

Sanitary tissue paper with recesses formed by embossing.
A sanitary tissue paper characterized by having a circular or elliptical shape with no corners and a non-pressing portion having an area of 13 to 35% of the area of the bottom in the central portion of the bottom of the recess. It is a method of manufacturing sanitary tissue paper.
Base paper having a vertical dry tensile strength of 1,000 to 3,500 cN / 25 mm and a horizontal dry tensile strength of 400 to 2,000 cN / 25 mm, or
Base paper having a vertical dry tensile strength of 150 to 1,000 cN / 25 mm and a horizontal dry tensile strength of 50 to 400 cN / 25 mm, or
Base paper with a vertical dry tensile strength of 1,000 to 3,500 cN / 25 mm and a horizontal dry tensile strength of 300 to 2,500 cN / 25 mm.
It has an embossing step of pressing a convex portion for embossing against the above to form a concave portion corresponding to the convex portion for embossing, and the convex portion for embossing has a top surface area at the center of the top surface. It has an area of 13-35%, is circular or elliptical with no corners, and has recesses with a depth of 10-70% of the height of the protrusions.
A method for producing hygienic tissue paper, which is characterized by this.

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