Sanitary paper

Abstract

To provide sanitary paper having soft touch even with embossment.SOLUTION: Sanitary paper is formed by a sheet having unevenness by embossing. A thickness of the sheet is equal to or greater than 220 μm and equal to or less than 270 μm. A basis weight of the sheet is equal to or greater than 19 g / m2 and equal to or less than 27 g / m2. A dried tensile strength of the sheet in an MD direction is equal to or less than 2,000 cN and a wet tensile strength of the sheet in a CD direction is equal to or greater than 90 cN.

Description

[Technical Field]

[0001] The present invention relates to sanitary paper. [Background technology]

[0002] Sanitary paper such as paper towels and kitchen paper is embossed to improve its absorbency (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-094976 [Patent Document 2] Japanese Patent Application Publication No. 2019-157319 Summary of the Invention [Problem to be solved by the invention]

[0004] However, embossed sanitary paper has a hard finish and feels uncomfortable to the touch.

[0005] An object of the present invention is to provide sanitary paper that is soft to the touch even when embossed. [Means for solving the problem]

[0006] The first aspect of the present invention is sanitary paper formed from a sheet having embossed concavities and convexities, the thickness of the sheet being 220 μm or more and 270 μm or less, and the basis weight of the sheet being 19 g / m 2 More than 27g / m 2 The sanitary paper has a dry tensile strength of 2000 cN or less in the MD direction of the sheet and a wet tensile strength of 90 cN or more in the CD direction of the sheet.

[0007] In this specification, embossing refers to a process in which a mold with concave and convex shapes is pressed against a sheet that constitutes sanitary paper to create concave and convex shapes on the sheet. Sheet thickness refers to the thickness per two plies of the sheet that constitutes the sanitary paper, and corresponds to the distance from the top of the convex shape on one side of the embossed sheet to the top of the convex shape on the other side of the sheet, or the distance from the bottom of the concave shape on one side of the sheet to the bottom of the concave shape on the other side of the sheet. Basis weight refers to the basis weight per ply of the sheet that constitutes the sanitary paper.

[0008] The dry tensile strength in the MD direction indicates the strength when a two-ply sheet that makes up the sanitary paper is pulled in the MD direction in a dry state. The MD direction indicates the direction in which the fibers that make up the sheet flow. The wet tensile strength in the CD direction indicates the strength when a sheet that makes up the sanitary paper is pulled in the CD direction in a wet state. The CD direction indicates the direction perpendicular to the direction in which the fibers that make up the sheet flow.

[0009] In the first embodiment, the thickness of the sheet having the concave and convex portions formed by embossing is 220 μm or more and 270 μm or less, and the basis weight is 19 g / m 2 More than 27g / m 2 When the dry tensile strength in the MD direction is 2000 cN or less and the wet tensile strength in the CD direction is 90 cN or more, sanitary paper made from such a sheet will be soft to the touch even if the sheet is embossed.

[0010] Furthermore, such soft sanitary paper provides users with a feel similar to that of cloth towels, encouraging them to switch from sanitary cloth to sanitary paper.Furthermore, when used as paper towels, such sanitary paper can be used to wipe not only hands but also delicate areas of the body such as the face.

[0011] The second aspect of the present invention is a sheet having a surface roughness of 0.5 gf / cm 2 The sanitary paper according to the first aspect has a thickness of 0.4 mm or more and 0.8 mm or less under load. 2The thickness under load is 0.5gf / cm 2 This indicates the thickness of the sheet when a load of 1000 kJ / cm is applied.

[0012] In a second embodiment, the sheet has a tensile strength of 0.5 gf / cm 2 By having a thickness under load of 0.4 mm or more and 0.8 mm or less, sanitary paper made from such sheets is thick, giving users peace of mind regarding the amount of water absorbed.

[0013] In a third aspect of the present invention, the compression energy of the sheet is 0.4 gf cm / cm 2 In this specification, the compressive energy of a sheet is the energy required to compress a 1 cm2 surface of a sheet when a load is applied to a two-ply sheet. 2 This indicates the energy absorbed by the impact, and the higher the value, the easier the sheet is to compress and the softer it is.

[0014] In the third embodiment, the compression energy of the sheet is 0.4 gf·cm / cm 2 As a result, sanitary paper made of such a sheet can provide the user with an appropriate softness when subjected to a load.

[0015] In a fourth aspect of the present invention, there is provided sanitary paper according to any one of the first to third aspects, wherein the compression recovery of the sheet is 40% or more. In this specification, the compression recovery of the sheet indicates the resilience of the two-ply sheet against compression, with a higher value indicating greater resilience against compression.

[0016] In the fourth aspect, the compression recovery of the sheet is 40% or more, so that sanitary paper made from such a sheet can give a soft feeling to the user.

[0017] In a fifth aspect of the present invention, the embossing density of the sheet is 14 pieces / cm 2The sanitary paper according to any one of the first to fourth aspects is as described above. In this specification, the embossing density of the sheet is defined as the density of the surface of the sheet having embossed irregularities per 1 cm 2 Indicates the number of convex or concave hits.

[0018] In a fifth embodiment, the embossing density of the sheet is 14 pieces / cm 2 As a result, the embossing is less likely to be crushed even when a load is applied in the thickness direction of the sheet, and sanitary paper made from such a sheet can maintain its soft feel. [Effects of the Invention]

[0019] According to one aspect of the present invention, it is possible to provide sanitary paper that is soft to the touch even when embossed. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a diagram showing an embossing pattern used in the sanitary paper of the present embodiment. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a portion of the embossed pattern of FIG. 1. [Figure 3] FIG. 2 is an enlarged view of a cross section of a portion of the sanitary paper sheet of the present embodiment. [Figure 4] FIG. 1 is an enlarged cross-section of a portion of sanitary paper that has been embossed to deepen the unevenness. [Figure 5] FIG. 10 is a diagram illustrating how easily sanitary paper is compressed. DETAILED DESCRIPTION OF THE INVENTION

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, embodiments of the present invention will be described in detail. In this specification, the directions in the drawings will be described using a three-dimensional Cartesian coordinate system with three axial directions (X direction, Y direction, and Z direction).

[0022] The sanitary paper according to this embodiment is formed from a sheet with embossed irregularities. The sheet that constitutes the sanitary paper is a base paper made primarily of pulp. The pulp content of the base paper is 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0023] The pulp composition of the base paper is not particularly limited. For example, softwood pulp such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp) can be used in any ratio.

[0024] The ratio of softwood pulp to hardwood pulp in the base paper is not limited, but is preferably 70:30 to 10:90, more preferably 60:40 to 20:80, and even more preferably 50:50 to 30:70. Furthermore, recycled paper pulp may be used as the pulp contained in sanitary paper.

[0025] Embossing refers to a process in which a pattern with concave and convex shapes is pressed against a sheet constituting sanitary paper to create concave and convex shapes on the sheet. Embossing can be carried out by a known embossing method. The embossing method is not particularly limited, and examples include the steel rubber method and the steel match method. Among these, the steel match method is preferably used.

[0026] The pattern used in the embossing process (hereinafter referred to as the embossing pattern) is not limited. For example, as shown in Fig. 1, an embossing pattern is used in which a plurality of embossed convex portions (hereinafter referred to as convex portions) E1 and a plurality of embossed concave portions (hereinafter referred to as concave portions) E2 are formed on a base 1. In Fig. 1, the horizontal direction in which the convex portions E1 and concave portions E2 are arranged is the X direction, the vertical direction in which the convex portions E1 and concave portions E2 are arranged is the Y direction, and the height direction of the convex portions E1 and the depth direction of the concave portions E2 is the Z direction.

[0027] The convex portions E1 or concave portions E2 are arranged in the horizontal direction (X direction) at a pitch DX, and in the vertical direction (Y direction) at a pitch DY. The pitch DX and the pitch DY may be equal to or different from each other.

[0028] The pitch DX is not limited and is, for example, 2.0 mm to 5.0 mm, preferably 2.5 mm to 4.5 mm, and more preferably 3.0 mm to 4.0 mm. The pitch DY is not limited and is, for example, 2.0 mm to 5.0 mm, preferably 2.5 mm to 4.5 mm, and more preferably 3.0 mm to 4.0 mm.

[0029] The shape of the top ET of the protrusion E1 is not limited and may be, for example, a triangle, a square, a rectangle, a polygon with pentagons or more, a circle, an ellipse, etc. In the present disclosure, the shape of the top ET of the protrusion E1 is a square. The shape of the bottom EB of the recess E2 is not limited and may be, for example, a triangle, a square, a rectangle, a polygon with pentagons or more, a circle, an ellipse, etc. In the present disclosure, the shape of the bottom EB of the recess E2 is a square.

[0030] The dimensions of the apex ET of the protrusion E1 are not limited. For example, if the shape of the apex ET is square, the horizontal (X-direction) side X1 of the apex ET is preferably 0.1 mm or more and 2.0 mm or less, more preferably 0.5 mm or more and 1.5 mm or less, and even more preferably 0.8 mm or more and 1.2 mm or less. The vertical (Y-direction) side Y1 of the apex ET is preferably 0.1 mm or more and 2.0 mm or less, more preferably 0.5 mm or more and 1.5 mm or less, and even more preferably 0.8 mm or more and 1.2 mm or less.

[0031] The dimensions of the bottom EB of the recess E2 are not limited. For example, if the shape of the bottom EB is square, the horizontal side X2 of the bottom EB is preferably 0.1 mm or more and 2.0 mm or less, more preferably 0.5 mm or more and 1.5 mm or less, and even more preferably 0.8 mm or more and 1.2 mm or less. The vertical side Y2 of the bottom EB is preferably 0.1 mm or more and 2.0 mm or less, more preferably 0.5 mm or more and 1.5 mm or less, and even more preferably 0.8 mm or more and 1.2 mm or less.

[0032] 2, the height H1 of the protrusions E1 is not limited, but is preferably 50 μm to 200 μm, more preferably 75 μm to 175 μm, and even more preferably 100 μm to 150 μm. The depth H2 of the recesses E2 is preferably 50 μm to 200 μm, more preferably 75 μm to 175 μm, and even more preferably 100 μm to 150 μm.

[0033] The protrusion E1 has a side surface ES1 that slopes from the top ET of the protrusion E1 toward the bottom EB of the recess E2, and the recess E2 has a side surface ES2 that slopes from the bottom EB of the recess E2 toward the top ET of the protrusion E1.

[0034] The inclination angle of the side surface ES1 of the protrusion E1 is not limited, but is preferably 25 to 50 degrees relative to the height direction (Z direction) of the protrusion E1, more preferably 30 to 45 degrees, and even more preferably 35 to 40 degrees. The inclination angle of the side surface ES2 of the recess E2 is also not limited, but is preferably 25 to 50 degrees relative to the depth direction (Z direction) of the recess E2, but is more preferably 30 to 45 degrees, and even more preferably 35 to 40 degrees.

[0035] As shown in Fig. 2, the edge R1 between the protrusion E1 and the side surface ES1 is preferably rounded. The radius of curvature R of the rounded edge R1 is preferably 0.05 mm or more and 0.5 mm or less, more preferably 0.1 mm or more and 0.4 mm or less, and even more preferably 0.15 mm or more and 0.23 mm or less.

[0036] Furthermore, the edge R2 between the recess E2 and the side surface ES2 is preferably rounded. The radius of curvature of the rounded edge R2 is preferably 0.05 mm or more and 0.5 mm or less, more preferably 0.1 mm or more and 0.4 mm or less, and even more preferably 0.15 mm or more and 0.23 mm or less.

[0037] In addition, the embossing pattern has an embossing density of 14 pieces / cm 2 It is preferable that the number of particles is 15 or more per cm. 2 More preferably, 16 cells / cm 2 The embossing density is determined by the number of squares per 1 cm of the base surface on which the embossed pattern is formed. 2 The upper limit of the embossing density in the embossing pattern is arbitrary, but the practical upper limit is 30 / cm. 2 or less, preferably 25 / cm 2 Less than or equal to 20 particles / cm 2 The following is the result.

[0038] In a sheet embossed with such an embossing pattern, embossments are formed at the same density as the embossing density of the embossing pattern. That is, the embossing density of the sheet is 14 embossments / cm. 2 It is preferable that the number of particles is 15 or more per cm. 2 More preferably, 16 cells / cm 2 The upper limit of the embossing density of the sheet is arbitrary, but the practical upper limit is 30 embossments / cm. 2 or less, preferably 25 / cm 2 Less than or equal to 20 particles / cm 2 The following is the result.

[0039] In the present disclosure, bases 1 and 2 on which such an embossed pattern is formed are prepared, and a sheet is placed between the bases 1 and 2 to perform embossing. In the embossing, the two bases 1 are placed face to face so that the convex portions E1 or concave portions E2 of one base 1 overlap with the concave portions E2 or convex portions E1 of the embossment of the other base 2.

[0040] In this case, it is preferable to perform embossing so that the unevenness formed on the sheet is shallow. In embossing to make the unevenness shallow, with the sheet placed between two bases 1 and 2, one base 1 and the other base 2 are butted together until a gap (clearance) is formed between them, and then the embossing is completed.

[0041] In embossing that shallows the unevenness, the unevenness formed in the sheet by embossing is relatively shallow compared to embossing that deepens the unevenness (the embossing is completed by butting one base 1 against the other base 2 to the extent that there is as little gap (clearance) as possible between the two bases 1). For example, as shown in Figures 3 and 4, the height H3 of the convexities 3A (or the depth of the concaves 3B) formed in the sheet 3 by embossing that shallows the unevenness is lower (or shallower) than the height H4 of the convexities 4A (or the depth H4 of the concaves 4B) formed in the sheet 4 by embossing that deepens the unevenness.

[0042] The sanitary paper of the present disclosure has a sheet thickness (hereinafter sometimes referred to as paper thickness) of 220 μm to 270 μm, preferably 225 μm to 265 μm, and more preferably 230 μm to 260 μm. Paper thickness can be measured in accordance with the provisions of JIS P 8111 (1998).

[0043] The sheet thickness is the thickness per two plies of the sheet that make up the sanitary paper 3, and corresponds to the distance from the top of the convex 3A on one side of the embossed sheet to the top of the convex 3A on the other side of the sanitary paper 3, or the distance from the bottom 3B of the concave on one side of the sheet to the bottom 3B of the concave on the other side, as shown in Figure 3. The basis weight indicates the basis weight per ply of the sheet that makes up the sanitary paper.

[0044] The basis weight of the sheet (also called the basis weight in U.S.) is not particularly limited, and may be, for example, 19 g / m depending on the number of plies of the sheet. 2 More than 27g / m 2 and preferably 20 g / m 2 More than 26g / m 2 or less, more preferably 21 g / m 2 More than 25g / m 2 The basis weight can be measured in accordance with the provisions of JIS P 8124 (2011).

[0045] The number of plies of the sheet is not particularly limited, but can be one or more, preferably one or two (two sheets stacked together). The form of the sheet is also not particularly limited, but examples include a laminate of sheets with a quadrangular (rectangular, square, etc.) outline shape in which one ply of sanitary paper is folded, or a long sheet wound into a roll.

[0046] The dry tensile strength of the sheet in the MD direction is 2000 cN or less, preferably 1800 cN or less, and more preferably 1600 cN or less. The lower limit of the dry tensile strength of the sheet in the MD direction is arbitrary, but the practical lower limit is 300 cN or more, and the smaller the better.

[0047] The dry tensile strength in the MD direction indicates the strength when a two-ply sheet constituting sanitary paper is pulled in the MD direction in a dry state. The MD direction indicates the direction in which the fibers constituting the sheet flow.

[0048] The dry tensile strength in the CD direction of the sheet is arbitrary, for example, 30 cN to 1000 cN, preferably 80 cN to 800 cN, and more preferably 140 cN to 500 cN. The dry tensile strength in the CD direction refers to the strength when the sheet constituting the sanitary paper is pulled in the CD direction in a dry state. The CD direction refers to the direction perpendicular to the flow direction of the fibers constituting the sheet.

[0049] Furthermore, the wet tensile strength of the sheet in the CD direction is 90 cN or more, preferably 110 cN or more, or 140 cN or more. The upper limit of the wet tensile strength of the sheet in the CD direction is optional, but a practical upper limit is 500 cN or less, preferably 400 cN or less, and more preferably 300 cN or less.

[0050] In the sanitary paper of the present disclosure, 0.5 gf / cm 2The thickness under load is preferably 0.4 mm or more and 0.8 mm or less, more preferably 0.5 mm or more and 0.75 mm or less, and even more preferably 0.6 mm or more and 0.7 mm or less. 2 The thickness under load is 0.5gf / cm 2 This indicates the thickness of the sheet when a load of 1000 kJ / cm is applied.

[0051] In the sanitary paper disclosed herein, the sheet compression energy is 0.4 gf·cm / cm 2 It is preferable that it is equal to or greater than 0.45 gf cm / cm 2 More preferably, 0.5 gf cm / cm 2 The upper limit of the sheet compression energy is arbitrary, but the practical upper limit is 5 gf cm / cm 2 The following is the result.

[0052] The compression energy of the sheet is calculated by the following formula: 2 This indicates the energy absorbed by the impact, and the higher the value, the easier the sheet is to compress and the softer it is.

[0053] In the sanitary paper of the present disclosure, the compression recovery of the sheet is preferably 40% or more, more preferably 45% or more, and even more preferably 50% or more. The upper limit of the compression recovery of the sheet is optional, but a practical upper limit is 100% or less, preferably 80% or less, and more preferably 60% or less.

[0054] The compression recovery of the sheet indicates the elasticity of the two-ply sheet against compression, and a higher value means a higher resilience against compression.

[0055] The sanitary paper is not particularly limited in form, and can be applied to, for example, sanitary thin paper such as paper towels, kitchen paper, wipes, tissue paper, and toilet paper. Some of these sanitary papers contain moisturizing ingredients. The sanitary paper of the present disclosure is preferably used for paper towels and toilet paper.

[0056] Sanitary paper can be used for industrial, home, and portable purposes, but is preferably used for home use.

[0057] In the sanitary paper of the present disclosure, as described above, the thickness of the sheet having the embossed concaves and convexes is 220 μm or more and 270 μm or less, and the basis weight is 19 g / m 2 More than 27g / m 2 When the dry tensile strength in the MD direction is 2000 cN or less and the wet tensile strength in the CD direction is 90 cN or more, sanitary paper made from such a sheet will be soft to the touch even if the sheet is embossed.

[0058] Furthermore, such soft sanitary paper provides users with a feel similar to that of cloth towels, encouraging them to switch from sanitary cloth to sanitary paper.Furthermore, when used as paper towels, such sanitary paper can be used to wipe not only hands but also delicate areas of the body such as the face.

[0059] In the sanitary paper of the present disclosure, as described above, the sheet has a tensile strength of 0.5 gf / cm 2 By having a thickness under load of 0.4 mm or more and 0.8 mm or less, sanitary paper made from such sheets is thick, giving users peace of mind regarding the amount of water absorbed.

[0060] As described above, the sanitary paper of the present disclosure has a sheet compression energy of 0.4 gf·cm / cm 2As a result, the sheet S can be easily compressed by the pressing member P, as shown in Figure 5. Sanitary paper made from such a sheet can provide users with a soft and fluffy feel.

[0061] As described above, the sanitary paper of the present disclosure has a compression recovery of 40% or more, so that the sheet S compressed by the pressing member P can easily recover when used with sanitary paper made of such a sheet, as shown in Figure 5. Sanitary paper made of such a sheet can provide users with a soft, fluffy feel.

[0062] As described above, the sanitary paper of the present disclosure has an embossing density of 14 pieces / cm 2 As a result, the embossing is less likely to be crushed even when a load is applied in the thickness direction of the sheet, and sanitary paper made from such a sheet can maintain its soft feel. [Example]

[0063] The present invention will be described in more detail below with reference to examples. The examples and comparative examples were evaluated by the following tests.

[0064] [Sanitary paper] Hygienic paper was prepared by forming two plies of embossed sheets. The pulp composition of the sheets was determined by the ratio N / L, which is softwood pulp N and hardwood pulp L.

[0065] [Embossed] The sheet was embossed using a steel match method. The embossing pattern used for the embossing was a base 1 having a plurality of convex portions E1 and a plurality of concave portions E2 formed thereon, as shown in Figure 1. In the embossing pattern, the pitch DX of the convex portion E1 or the concave portion E2 was 3.5 mm, the pitch DY was 3.5 mm, the shape of the top ET of the convex portion E1 was square, the shape of the bottom EB of the concave portion E2 was square, the sides X1 and Y1 of the top ET of the convex portion E1 were 1.0 mm, the sides X2 and Y2 of the bottom EB of the concave portion E2 were 1.0 mm, the height H1 of the convex portion E1 was 1.0 mm, the depth H2 of the concave portion E2 was 1.0 mm, the side ES1 of the convex portion E1 was inclined at 26.9 degrees with respect to the height direction (Z direction) of the convex portion E1, the side ES2 of the concave portion E2 was inclined at 26.9 degrees with respect to the depth direction (Z direction) of the concave portion E2, the edge R1 between the convex portion E1 and the side ES1 was rounded with a radius of curvature R of 0.2 mm, and the edge R2 between the concave portion E2 and the side ES2 was rounded with a radius of curvature R of 0.2 mm. There are two types of embossing: shallow embossing (embossing is performed to the extent that a clearance is created between opposing embossed patterns) and deep embossing (embossing is performed to the extent that as little clearance as possible is created between opposing embossed patterns).

[0066] [Basis weight of sheet (U.S. basis weight)] The basis weight (grams) per ply of the sheet was measured in accordance with the JIS P 8124 (2011) standard. The unit of basis weight is g / m 2 is.

[0067] [Paper thickness] Using a thickness measuring device (Ozaki Seisakusho, PEACOCK Dial Thickness Gauge G-30), the thickness of 10 sheets was measured at three points per set of two-ply sheets, and the average value was calculated as the paper thickness. The paper thickness was the thickness of the sheet after embossing (post-embossing).

[0068] [Dry tensile strength] The dry tensile strength of the two-ply sheet was measured in accordance with JIS P 8113 (1998). The sheet was cut into test specimens approximately 25 mm wide (±0.5 mm) and 150 mm long in both the machine direction (MD) and the cross direction (CD). A tension-compression tester (Minebea, TG-200N) was used. Dry tensile strength measurements were performed with a grip spacing of 100 mm, with both ends of the test specimen clamped between the grips. A tensile load was applied to the test specimen in the vertical direction, and the digital reading at the time of specimen breakage was read. The tensile speed in the MD direction was 100 mm / min, and the tensile speed in the CD direction was 100 mm / min. Test specimens were prepared in both the MD and CD directions, and measurements were performed five times. The average of these measurements was used as the dry tensile strength in each direction.

[0069] [Wet tensile strength] The wet tensile strength of the two-ply sheet was measured according to JIS P 8113 (1998) after the test specimens were left at 105°C for 10 minutes. The sheets were cut into test specimens approximately 25 mm wide (±0.5 mm) and 150 mm long in the cross direction (CD). A tension-compression tester (Minebea Co., Ltd., TG-200N) was used. Wet tensile strength was measured by clamping both ends of the test specimen between the grips of the tester with a 100 mm grip distance. Water was applied to the center 10 mm of the specimen with a brush. The specimen was then pulled vertically and a load was applied. The digital reading at the time of specimen breakage was recorded. The pulling speed was 100 mm / min. Five sets of test specimens were prepared, and each test was performed five times. The average of the measurements was used as the wet tensile strength in the cross direction.

[0070] [Compression characteristics (measured using KES-G5)] Using a compression tester (Kato Tech, KES-G5), terminal T was placed on the top surface of the two-ply sheet that constitutes the sanitary paper, with a contact area of ​​2.0 cm. 2 The contact was made so that the upper limit load was 50 gf / cm at a speed of 0.01 cm / s. 2 Compression energy WC, compression recovery RC and 0.5gf / cm 2The thickness under load was measured. Compression energy WC, compression recovery RC, and 0.5 gf / cm 2 The thickness under load was measured for 10 specimens and the measurement results were averaged. The larger the compression energy WC, the easier it is to compress. The closer the compression recovery RC value is to 100%, the easier it is to recover.

[0071] [Softness and feel (measured by TSA)] The hand feel value (HF), softness peak TS7, smoothness peak TS750, and hardness D value (mm / N) were measured using a tissue softness analyzer (TSA) manufactured by Emtec Electronic Co., Ltd. HF, TS7, TS750, and D value were measured for 10 specimens, and the measurement results were averaged.

[0072] The higher the HF value, the better the feel on the skin. HF of 70 or more was evaluated as good, and HF of less than 70 was evaluated as poor.

[0073] A smaller TS7 value indicates softer material. A TS7 of 15 or less was evaluated as good, and a TS7 of more than 15 was evaluated as poor.

[0074] The smaller the TS750 value, the smoother the surface. A TS750 of 90 or less was evaluated as good, and a value above 90 was evaluated as poor.

[0075] A larger D value indicates softer material. A D value of 2.3 mm / N or more was evaluated as good, and a value of less than 2.3 mm / N was evaluated as poor.

[0076] Examples and comparative examples will be described below.

[0077] [Example 1] A sheet with a pulp blend (N / L) of 50 / 50, lightly embossed, with a basis weight of 21.9 g / m 2, thickness 256 μm, dry tensile strength in MD 1543 cN, dry tensile strength in CD 338 cN, wet tensile strength in MD 201 cN, compression energy WC 0.51 gf·cm / cm 2 , compression recovery RC is 59.9gf·cm / cm 2 , 0.5gf / cm 2 Sanitary paper having a thickness T0 of 0.67 mm under load was produced and evaluated. The conditions and results of Example 1 are shown in Table 1.

[0078] [Example 2] A sheet with a pulp blend (N / L) of 30 / 70, lightly embossed, and a basis weight of 23.5 g / m 2 , thickness 239 μm, dry tensile strength in MD 998 cN, dry tensile strength in CD 189 cN, wet tensile strength in MD 139 cN, compression energy WC 0.50 gf·cm / cm 2 , compression recovery RC is 52.3gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.66 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Example 1. The conditions and results of Example 2 are shown in Table 1.

[0079] [Comparative Example 1] The sheet is deeply embossed and has a basis weight of 21.6 g / m 2 , thickness 307 μm, dry tensile strength in MD 1319 cN, dry tensile strength in CD 262 cN, wet tensile strength in MD 187 cN, compression energy WC 0.46 gf·cm / cm 2 , compression recovery RC is 59.0gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.66 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Example 1. The conditions and results of Comparative Example 1 are shown in Table 1.

[0080] Comparative Example 2 The sheet is deeply embossed and has a basis weight of 23.0 g / m 2, thickness 271 μm, dry tensile strength in MD 798 cN, dry tensile strength in CD 182 cN, wet tensile strength in MD 108 cN, compression energy WC 0.34 gf·cm / cm 2 , compression recovery RC is 51.4gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.68 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Example 2. The conditions and results of Comparative Example 2 are shown in Table 1.

[0081] Comparative Example 3 The sheet has a pulp composition (N / L) of 30 / 70 and is embossed, with a basis weight of 21.0 g / m 2 , thickness 208 μm, dry tensile strength in MD 1746 cN, dry tensile strength in CD 216 cN, wet tensile strength in MD 78 cN, compression energy WC 0.34 gf·cm / cm 2 , compression recovery RC is 47.1gf·cm / cm 2 , 0.5gf / cm 2 The sanitary paper having a thickness T0 of 0.34 mm under load was evaluated. The conditions and results of Comparative Example 3 are shown in Table 1.

[0082] Comparative Example 4 The sheet is not embossed and has a basis weight of 24.1 g / m 2 , thickness 219 μm, dry tensile strength in MD 2675 cN, dry tensile strength in CD 721 cN, wet tensile strength in MD 369 cN, compression energy WC 0.07 gf·cm / cm 2 , compression recovery RC is 30.3gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.26 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Example 2. The conditions and results of Comparative Example 4 are shown in Table 1.

[0083] Comparative Example 5 Basis weight: 24.0 g / m 2, thickness 426 μm, dry tensile strength in MD 2635 cN, dry tensile strength in CD 650 cN, wet tensile strength in MD 304 cN, compression energy WC 0.63 gf·cm / cm 2 , compression recovery RC is 61.5gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.63 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Example 2. The conditions and results of Comparative Example 5 are shown in Table 1.

[0084] Comparative Example 6 Basis weight: 23.7 g / m 2 , thickness 401 μm, dry tensile strength in MD 2486 cN, dry tensile strength in CD 671 cN, wet tensile strength in MD 489 cN, compression energy WC 0.39 gf·cm / cm 2 , compression recovery RC is 57.5gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.51 mm. Other than that, sanitary paper was produced and evaluated in the same manner as in Comparative Example 2. The conditions and results of Comparative Example 6 are shown in Table 1.

[0085] Comparative Example 7 Basis weight: 22.5 g / m 2 , thickness 224 μm, dry tensile strength in MD 2828 cN, dry tensile strength in CD 602 ​​cN, wet tensile strength in MD 360 cN, compression energy WC 0.07 gf·cm / cm 2 , compression recovery RC is 28.5gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.26 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Comparative Example 4. The conditions and results of Comparative Example 7 are shown in Table 1.

[0086] [Comparative Example 8] Basis weight: 22.4 g / m 2 , thickness 390 μm, dry tensile strength in MD 2156 cN, dry tensile strength in CD 587 cN, wet tensile strength in MD 279 cN, compression energy WC 0.43 gf·cm / cm2 , compression recovery RC is 55.6gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.49 mm. Except for this, sanitary paper was produced and evaluated in the same manner as in Comparative Example 5. The conditions and results of Comparative Example 8 are shown in Table 1.

[0087] Comparative Example 9 Basis weight is 22.3g / m 2 , thickness 530 μm, dry tensile strength in MD 2025 cN, dry tensile strength in CD 506 cN, wet tensile strength in MD 286 cN, compression energy WC 0.44 gf·cm / cm 2 , compression recovery RC is 53.7gf·cm / cm 2 , 0.5gf / cm 2 The thickness T0 under load was 0.51 mm. Other than that, sanitary paper was produced and evaluated in the same manner as in Comparative Example 2. The conditions and results of Comparative Example 9 are shown in Table 1.

[0088] [Table 1]

[0089] As can be seen from Table 1, in Examples 1 and 2, the sanitary paper formed from a sheet having embossed irregularities has a sheet thickness of 220 μm or more and 270 μm or less, and a sheet basis weight of 19 g / m 2 More than 27g / m 2 When the dry tensile strength in the MD direction of the sheet was 2000 cN or less and the wet tensile strength in the CD direction of the sheet was 90 cN or more, the HF, TS7, TS750, and D values ​​were all good.

[0090] In contrast, in Comparative Examples 1 to 9, the sheets constituting the sanitary paper are embossed, the thickness of the sheets is 220 μm or more and 270 μm or less, and the basis weight of the sheets is 19 g / m 2 More than 27g / m 2Sanitary papers that did not meet at least one of the following conditions were evaluated: the dry tensile strength in the MD of the sheet was 2000 cN or less; the wet tensile strength in the CD of the sheet was 90 cN or more; and at least one of the HF, TS7, TS750, and D values ​​was poor.

[0091] Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims. [Explanation of symbols]

[0092] 1 base 2. Bass E1 Embossed convex part ET top H1 Height X1 side X2 side ES1 side DX Pitch E2 Embossed recess EB bottom H2 Depth Y1 side Y2 side ES2 Side DY Pitch 3 Sanitary paper (sheets) 3A convex 3B concave H3 Height (depth) 4 seats 4A convex 4B concave H4 Height (depth) S seat P pressing member

Claims

1. Sanitary paper made of a sheet with embossed texture, The thickness of the sheet is 220 μm or more and 270 μm or less, The basis weight of the sheet is 19 g / m ２ 27g / m or more ２ is as follows: The dry tensile strength of the sheet in the MD direction is 2000 cN or less, The sanitary paper has a wet tensile strength in the CD direction of 90 cN or more.

2. 0.5 gf / cm of the sheet ２ The sanitary paper according to claim 1, wherein the thickness under load is 0.4 mm or more and 0.8 mm or less.

3. The compression energy of the sheet is 0.4 gf cm / cm ２ The sanitary paper according to claim 1 .

4. The sanitary paper according to claim 1, wherein the sheet has a compression recovery of 40% or more.

5. The embossing density of the concave and convex portions formed by the embossing process is 14 pieces / cm ２ The sanitary paper according to claim 1 .

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