Toilet roll

Abstract

To provide a toilet roll that satisfies softness in spite of a long rolled article and that hardly fractures.SOLUTION: The toilet roll is formed by winding 2 ply hygienic thin paper 10 in a superimposed state. Paper density per 1 ply is 10.0-15.0 g / m2. Paper thickness per 1 ply is 60-95 μm. The outer diameter of paper sleeve 20 is 20-45 mm. Roll length for 2 ply is 60-90 m. Tension modulus at 1 ply is 6.0-16.0 N / mm2. Breaking work is 3.0-6.0 N / mm. Embossment is formed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a toilet roll. [Background technology]

[0002] There are a variety of toilet rolls on the market that differ in factors such as the number of plies, whether or not the roll is embossed, the basis weight, the paper thickness, the roll length, and the roll density.

[0003] One of them is a group of products that are long-length rolls. In other words, the basis weight per ply is not so low, and although it is two plies, the roll length is long and double embossed to give a soft feel. An example of this is the product in Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-188342 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in this type of long roll product, the sheet tends to become thin and hard, which not only impairs the necessary properties such as softness, but also makes the sheet more susceptible to breakage.

[0006] Therefore, a main object of the present invention is to provide a toilet roll which is long and yet has a satisfactory softness and is difficult to break. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a sanitary tissue paper roll in a two-ply stacked state, Basis weight per ply is 10.0-15.0g / m 2The paper thickness per ply is 60 to 95 μm, the outer diameter of the paper core is 20 to 45 mm, and the winding length for two plies is 60 to 90 m. Furthermore, the tensile modulus of one ply is 6.0 to 16.0 N / mm 2 , the breaking work is 3.0 to 6.0 N mm; An embossment is formed on each ply, and these are laminated to form a double embossment. The embossing pattern is a pattern in which embossing recesses each having a rectangular shape in a plan view are arranged in a lattice shape with centers spaced apart from one another in the width direction and the continuous direction of the ply, A valley groove is formed so as to connect the corner of the recess to the corner of the adjacent recess. This is a toilet roll characterized by the above. The tensile modulus and breaking work are values ​​measured in the longitudinal direction of the fiber, and are values ​​measured on a 25 mm wide sample with a gripping jig distance of 50 mm in a tensile tester at a pulling speed of 10 mm / min. Effect of the Invention

[0008] According to the present invention, it is possible to provide a toilet roll that is long and yet has a satisfactory softness and is difficult to break. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the results of a tensile test in Comparative Example 1. [Diagram 2] FIG. 2 is a diagram showing the results of a tensile test in Example 1. [Diagram 3] FIG. 1 is a schematic perspective view of a toilet roll. [Figure 4] FIG. 11 is a plan view of an example of an embossing pattern. [Diagram 5] 5 is a cross-sectional view of a main part taken along the line in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present invention will be described in more detail below with reference to the embodiments thereof.

[0011] The toilet roll according to the present invention is produced by winding a strip of toilet paper 10 around a paper tube (also called a tube core) 20 into a roll, as shown in FIG.

[0012] This toilet paper is made from 100% virgin pulp by mass as its fiber material, but can also contain recycled paper pulp. For example, the fiber material may be 30-70% by mass of virgin pulp and 30-70% by mass of recycled paper pulp. Recycled paper pulp is cheaper than virgin pulp, and by blending recycled paper pulp, the fiber material can be produced more cheaply than one made of 100% by mass of virgin pulp.

[0013] Although the waste paper pulp is not necessarily limited, it is particularly preferable to use high-quality waste paper pulp (also called F-DIP, high-quality waste paper pulp, or high-quality deinked pulp) made from high-quality waste paper. High-quality waste paper pulp is made from selected high-quality waste paper such as high-quality paper, colored high-quality paper, and slightly glossy paper, and contains a large amount of hardwood kraft pulp (LBKP) derived from the raw material. This makes it easy to develop paper strength, and in particular makes it extremely easy to configure the basis weight, paper thickness, dry tensile strength, roll diameter, and roll density of toilet paper.

[0014] The toilet paper according to the present invention has the above-mentioned fiber material composition and has a basis weight (basis weight per ply) of 10.0 to 15.0 g / m 2 , especially 11.0 to 14.0 g / m 2 First, if the basis weight is too small, it is difficult to obtain the necessary strength and paper thickness, and if the basis weight is too large, the paper thickness becomes too large, making it difficult to obtain a desired compact roll diameter range. The basis weight is a value measured based on JIS P 8124 (1998).

[0015] The thickness of each ply is 60 to 95 μm, and 70 to 90 μm is particularly desirable. If the thickness is too thin, it is difficult to ensure the necessary strength, and the paper loses stiffness and loses texture, particularly softness. Furthermore, it is difficult to achieve a suitable roll diameter and firmness for the product. Conversely, if the thickness is too thick, it is difficult to achieve the desired roll diameter, making it difficult to achieve compactness.

[0016] The paper thickness is measured by thoroughly conditioning the test piece under the conditions of JIS P 8111 (1998) (usually for about 8 hours) and then measuring the thickness of one ply under the same conditions using a dial thickness gauge (thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Manufacturing Co., Ltd.). Specifically, after making sure that there is no dirt or dust between the plunger and the measurement table, the plunger is lowered onto the measurement table, the dial thickness gauge's scale is moved to set the zero point, the plunger is then raised and the sample is placed on the test table, the plunger is slowly lowered and the gauge at that time is read. At this time, the plunger is simply placed on the test table. The plunger terminal is made of metal and the circular flat surface with a diameter of 10 mm is made to contact the paper plane perpendicularly, and the load during the paper thickness measurement is about 70 gf. The paper thickness is the average value obtained by performing 10 measurements. The dry tensile strength according to the present invention is specified in JIS P 8113.

[0017] The outer diameter of the paper core is preferably 20 to 45 mm, and more preferably 35 to 45 mm. The outer diameter of the paper core is not fundamentally related to the characteristics of the toilet paper, but is specified in terms of the winding length and winding density of the two plies.

[0018] The winding length for two plies is 60 to 90 m, and 65 to 85 m is particularly desirable.

[0019] The toilet paper in this embodiment is made from a fiber material composition of virgin pulp and, if necessary, recycled paper pulp, and has a basis weight, paper thickness, paper tube outer diameter, and roll length in two plies, so that, despite its long length, it can easily fit into a commercially available toilet roll holder and can be easily removed from the holder. In addition, these "fit" and "ease of removal" are evaluated as "ease of hanging" and "ease of turning" in the test results described below.

[0020] The toilet paper of the present invention has a tensile modulus of 6.0 to 16.0 N / mm per ply. 2 , more preferably 6.5 to 10.0 N / mm 2 The breaking force is 3.0~6.0N·mm, preferably 3.5~5.5N·mm, and the paper satisfies the softness requirement and is difficult to break. The tensile modulus and breaking work are values ​​measured in the longitudinal direction of the fiber, and are values ​​measured on a 25 mm wide sample with a gripping jig distance of 50 mm in a tensile tester at a pulling speed of 10 mm / min.

[0021] In addition, it is more desirable that the breaking elongation is 6.0 to 12.0%.

[0022] There are long-length products on the market that have similar basis weight and thickness, but the tensile modulus and work of rupture of these products are different.

[0023] Typically, the tensile test results for Comparative Example 1 are shown in FIG. 1, whereas the tensile test results for Example 1 are shown in FIG.

[0024] A supplementary explanation regarding this test will be given below. That is, when a toilet paper sheet is gently touched, if the sheet is stretchy, the stress from the sheet is reduced and the user feels that the sheet is soft. In this way, assuming "gently touching the sheet," the optimum way to judge the quality of the sheet is to obtain the tensile modulus value at a displacement of 0 with a tensile testing machine gripping jig tensile speed of 10 mm / min. The displacement of 0 is defined as the point where the elongation (stroke) is 0 when a load of 0.2 N is applied using a 25 mm wide sample in accordance with JIS P 8113. Usually, the tensile strength is measured at a pulling speed of 100 mm / min, and the breaking elongation is larger in Comparative Example 1. This is because the breaking strength of the sheet is high, and the sheet (paper quality) is hard, which is different from the elongation of the soft sheet shown in Example 1, as shown in Figure 2.

[0025] Similarly, with respect to the work to break at a tensile speed of 10 mm / min, Example 1 had a higher work to break than Comparative Example 1, and it can be said that the material is less likely to break due to elongation.

[0026] Tensile modulus of elasticity in one ply: 6.0 to 16.0 N / mm 2 A sheet with a breaking work of 3.0 to 6.0 N·mm can be said to be a paper that satisfies the softness requirement and is difficult to break. In fact, the evaluation based on the tensile modulus and work of break values ​​has a high correspondence with the sensory evaluation, as will be shown in the test evaluation described later.

[0027] As a means for obtaining a toilet roll that is long yet has a satisfactory softness and is difficult to break, for example, a method of operating the machine so that the elongation due to the crepe is maintained even after processing by using the ironing effect of the crepe shape by calendaring in a ply machine, or a method of embossing can be mentioned.

[0028] Regarding embossing, further examples include the ridges of the embossing that partially destroy the fibers relative to the overall flow, making the material more likely to stretch and shrink under small loads (provisionally named "Mt. Fuji embossing"); and the embossing can be double embossed. When double embossing is used, there is a gap between the sheets and both the front and back are smooth, resulting in a soft and smooth quality.In contrast, with single embossing, which is commonly used for long products, it is difficult to obtain a product with sufficient softness, as will be shown in the test examples described later.

[0029] In the embodiment, the winding density of the toilet roll is preferably 1.0 to 1.8, particularly 1.2 to 1.7. When the winding density is low, the winding is loose and the texture can be maintained, but the winding length is short compared to the roll diameter, resulting in excessive logistics costs. On the other hand, when the winding density is high, the texture is significantly reduced. The winding density is calculated as described below.

[0030] On the other hand, in the toilet paper according to the present invention, a softener can be blended to adjust the paper strength and improve the surface properties. However, the softener here is not an externally applied agent to the toilet paper like a moisturizer or lotion, but an internally added agent to the papermaking raw material. When an externally applied agent like a lotion is used, the paper strength decreases when the agent is applied, making it difficult to wind the paper at a high tension for compacting, and manufacturing becomes extremely difficult. In addition, it is difficult to achieve a desired winding density and to reduce the price. The blending amount of the softener is preferably 0.8 to 2.0 kg / t. A preferred softener contains a nonionic surfactant (component A) having an alkyl group and / or an alkenyl group and a cationic surfactant (component B) having an alkyl group and / or an alkenyl group. In particular, it is preferable that the nonionic surfactant (component A) has an alkyl group having 6 to 24 carbon atoms and / or an alkenyl group having 6 to 24 carbon atoms as a hydrophobic part. If the carbon number of the A component is less than 6, the softening effect may not be enhanced, and if the carbon number exceeds 24, dispersibility may be poor when added to a papermaking system.

[0031] In addition, when producing the toilet paper according to the present invention, the fiber raw material can be beaten as appropriate, but in the toilet paper according to the present invention, the beating operation can be omitted by blending recycled paper pulp.

[0032] The crepe ratio during papermaking can also be set appropriately. A crepe ratio of 15 to 27% is preferable, and 18 to 23% is more preferable. When processing into a roll, the winding diameter may be adjusted by draw or tension, so by setting the crepe ratio within the above range, the paper is less likely to tear even when moderate draw or tension is applied, and the paper does not become excessively thick, which is preferable.

[0033] Furthermore, it is preferable that the toilet paper is embossed. The embossing can be a suitable embossing pattern such as micro embossing, dot embossing, design embossing, etc. However, when embossing is applied, the depth of the embossing pattern is preferably 1.90 mm or less. More preferably, it is within the range of 0.7 mm to 1.90 mm. If it is deeper than 1.90 mm, it becomes difficult to make it compact. Also, if the embossing depth is shallower than 0.75 mm, the bulkiness and design due to the embossing tend to be insufficient. Note that the dimensions of the embossing refer to the actual dimensions of the convex portions formed on the embossing (metal) roll, and do not refer to the embossing imparted to the actual paper, since the mating surface of the embossing roll is an elastic roll made of rubber or the like. A preferred example of the embossment is one in which depressions with square bottoms are arranged so that each vertex of the positive bottom of the depression is connected to the vertex of the square bottom of the adjacent depression by a valley line, as in the above-mentioned "Mt. Fuji embossment." This embossment is likely to produce the desired effect of obtaining a sheet with soft and smooth quality.

[0034] A specific example of the aforementioned "Mt. Fuji embossing" is shown below. As shown in Figures 4 and 5, the "Mt. Fuji embossing" has rectangular-bottom recesses 40, 40 arranged in a lattice pattern across the entire surface of the page with a predetermined center distance L9, and valley grooves 41, 41... formed to connect the four corners of the bottom surface. It is particularly desirable for the "Mt. Fuji embossment" to have a rectangular bottom surface measuring 1.0 to 1.5 x 1.0 to 1.5 mm, a center-to-center spacing L9 of 4.5 to 5.5 mm, and for the recesses 50, 50... to be arranged in a lattice pattern at an angle of 40° to 50° to the width direction (the angle is indicated by the symbol ∠B in Figure 4).

[0035] It is not impossible to impart the "Mt. Fuji embossing" in the form of a so-called single embossing, in which a recess on one side becomes a protrusion on the other side, but it is preferable to use a so-called double embossing, in which both sides become recesses.

[0036] The toilet roll according to the present invention can be manufactured by winding the toilet paper base paper obtained in the papermaking process in accordance with a known manufacturing procedure. More specifically, in the manufacturing procedure in which a long paper tube is manufactured in a paper tube forming process in which a long paper tube is manufactured, the toilet paper manufactured in the papermaking process is wound around this long paper tube to manufacture a log, and this log is cut in the width direction to the product width (the width of symbol L3 in FIG. 3) to make individual toilet rolls, the toilet roll can be manufactured by adjusting the tension when winding the toilet paper around the paper tube, particularly when manufacturing the log. EXAMPLES

[0037] Next, examples and comparative examples of the toilet roll of the present invention will be shown to clarify the effects of the present invention.

[0038] The configuration of the toilet roll and the physical properties and composition of the toilet paper for each example are as shown in Table 1 below.

[0039] The fiber material is 30% softwood kraft pulp (NBKP) and 70% hardwood kraft pulp (LBKP).

[0040] The embossing was performed in the "Mt. Fuji embossing" described above, and the embossing pattern depth was 1.45 mm. Calendering was carried out on the paper machine and on the ply machine.

[0041] The evaluation involved 20 subjects actually using each example of toilet roll for one week, and then making absolute ratings on a 7-point scale for each of the following categories: "softness," "smoothness," "moisture," "fluffiness," and "tear resistance." The evaluation criteria were as follows: 7 points: very good, 6 points: good, 5 points: slightly good, 4 points: neither good nor bad, 3 points: slightly bad, 2 points: bad, 1 point: very bad.

[0042] The measurement methods for the values ​​in the table are as follows.

[0043] [Basic weight] Measured according to JIS P 8124 (1998).

[0044] [Paper thickness] Under the conditions of JIS P 8111 (1998), the thickness was measured according to the above-mentioned thickness measurement method using a dial thickness gauge (thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Seisakusho).

[0045] [Roll winding density] = theoretical cross-sectional area / roll cross-sectional area Roll cross-sectional area = Cross-sectional area of ​​entire roll - Cross-sectional area of ​​paper tube Theoretical cross-sectional area = paper thickness x roll length

[0046] [Tensile strength and elongation at break] Tensile speed (vertical) 100mm / min, (horizontal) 50mm / min, sample width 25mm, Distance between gripping jigs: 100 mm, Strength and elongation at break measured for two plies Measurement tester: Minebea Co., Ltd. "Tension and compression tester TG-200N"

[0047] [Tensile modulus (vertical)] The tensile speed was 10 mm / min, the sample width was 25 mm, the distance between the gripping jigs was 50 mm, and the measurement was carried out five times for one ply, and the average value was taken as the tensile modulus. Measurement tester: Shimadzu Corporation "EZS-20NX" Software: "TRAPEZIUMX"

[0048] [Work of Breaking (Vertical)] The integrated value of the load-displacement curve obtained for one ply at a tensile speed of 10 mm / min, sample width of 25 mm, and gripping jig distance of 50 mm. Measurement tester: Shimadzu Corporation "EZS-20NX" Software: "TRAPEZIUMX"

[0049] [Table 1]

[0050] [Table 2]

[0051] In Table 2, there is an example called "Reference Example," which is so named because, even if it is within the range specified by the present invention, it is not rated high enough.

[0052] From these comparative examples and examples, it can be said that by adopting the configuration of the present invention, it is possible to produce a toilet roll that is long and yet has a satisfactory softness and is difficult to break. [Explanation of symbols]

[0053] 1...toilet roll, 10...toilet paper, 20...paper tube (core), L1...toilet roll roll diameter, L2...toilet roll core diameter, L3...toilet roll width.

Claims

1. Two plies of sanitary tissue paper are stacked and rolled up, Basis weight per ply is 10.0 to 15.0 g / m ２ The paper thickness per ply is 60 to 95 μm, the outer diameter of the paper tube is 20 to 45 mm, and the winding length for two plies is 60 to 90 m, Furthermore, the tensile modulus of one ply is 6.0 to 16.0 N / mm ２ , the breaking work is 3.0 to 6.0 N mm; An embossment is formed on each of the plies, and these are laminated to form a double embossment. The embossing pattern is a pattern in which embossing recesses each having a rectangular shape in a plan view are arranged in a lattice shape with centers spaced apart from each other in the width direction and the continuous direction of the ply, A valley groove is formed so as to connect the corner of the recess to the corner of the adjacent recess. A toilet roll characterized by: The tensile modulus and breaking work are values ​​measured in the longitudinal direction of the fiber, and are values ​​measured on a 25 mm wide sample with a gripping jig distance of 50 mm in a tensile tester at a pulling speed of 10 mm / min.

2. The toilet roll according to claim 1, wherein the U.S. basis weight per ply is 11.0 to 14.0 g / m2.

3. The toilet roll according to claim 1, wherein the breaking elongation is 6.0 to 12.0%.

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