Toilet roll

Abstract

To provide a toilet roll that has a small difference in feeling at the beginning and end of the use.SOLUTION: In a toilet roll, toilet paper with a number of plies p is wound up in a roll shape around a paper tube. The wound length L (m) fulfills a relation of L≥90 / p. The roll density of the outer wound ODE of the toilet roll is calculated concerning the outer wound region of the toilet roll which corresponds to the toilet paper region in a range 85% or more and 95% or less in the wound length in a length from the end of the roll center side of the toilet roll. This roll density of the outer wound is higher than the roll density of the inner wound IDE of the toilet roll that is calculated concerning the inner wound region of the toilet roll which corresponds to the toilet paper region in a range 5% or more and 15% or less in the wound length in a length from the end of the roll center side of the toilet roll.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a toilet roll in which toilet paper is wound in a roll shape.

Background Art

[0002] In recent years, by increasing the winding length of toilet paper in a toilet roll (hereinafter also referred to as the winding length of the toilet roll), space saving during carrying and storage of the toilet roll has been achieved (Patent Document 1). Further, it is known to increase the winding length of the toilet roll while maintaining the winding diameter of the toilet roll within a predetermined dimension by reducing the basis weight of the toilet paper (Patent Document 2). Further, it is known to increase the winding length of the toilet paper while maintaining the winding diameter of the toilet roll within a predetermined dimension by increasing the roll density of the toilet paper (Patent Document 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when trying to increase the roll length of the toilet roll while maintaining the roll diameter of the toilet roll within a predetermined dimension, the toilet paper will be wound tightly in a roll shape. At this time, generally, a greater pressure is applied to the toilet paper in the region (inner winding region) that is relatively closer to the roll center in the radial direction of the toilet roll than in the region (outer winding region) that is relatively farther from the roll center (closer to the outer periphery of the roll) in the radial direction of the toilet roll. As a result, there is a difference in the paper quality of the toilet paper depending on the radial position within the toilet roll, and there is a problem that the texture of the toilet paper differs between the start and the end of using the toilet roll.

[0005] Also, when trying to increase the roll length of the toilet roll by increasing the roll density, the pressure applied to the inner winding region of the toilet roll increases, resulting in a difference in the paper quality of the toilet paper between the inner winding region and the outer winding region, and there is a problem that the texture of the toilet paper differs between the start and the end of using the toilet roll.

[0006] Therefore, an object of the present invention is to provide a toilet roll with a long roll length, in which the difference in the texture of the toilet paper between the start and the end of use is suppressed.

Means for Solving the Problems

[0007] As a result of intensive studies, the inventor of the present invention has found that by adjusting the roll density of the toilet roll according to the position within the toilet roll so that the pressure applied to the toilet paper wound around the toilet roll is smaller in the inner winding region on the roll center side than in the outer winding region on the outer peripheral side of the toilet roll, the pressure applied to the inner winding region can be reduced, and the difference in texture between the start and the end of using the toilet roll can be suppressed.

[0008] Specifically, the present invention has the following configuration. [1] Single-ply toilet paper is Around the paper tubeA toilet roll wound in a roll shape, having a roll length of 90 m or more, and the outer winding density ODE of the toilet roll calculated for the outer winding region of the toilet roll corresponding to the region of the toilet paper where the length from the end on the roll center side of the toilet roll is in the range of 85% to 95% of the roll length is higher than the inner winding density IDE of the toilet roll calculated for the inner winding region of the toilet roll corresponding to the region of the toilet paper where the length from the end on the roll center side of the toilet roll is in the range of 5% to 15% of the roll length. [2] The outer winding density ODE calculated as the winding density of the roll-shaped portion where the toilet paper is wound from the end on the roll center side of the toilet roll to a length of 90% of the roll length. 90 is 1.00 times greater than and 1.50 times or less than the inner winding density IDE calculated as the winding density of the roll-shaped portion where the toilet paper is wound from the end on the roll center side of the toilet roll to a length of 10% of the roll length. 10 The toilet roll according to [1], characterized in that it is greater than 1.00 times and less than or equal to 1.50 times that of [3] The outer winding density ODE is 1.15 m / cm 2 or more and 1.55 m / cm 2 or less, and the inner winding density IDE is 0.80 m / cm 2 or more and 1.20 m / cm 2 or less. The toilet roll according to [1] or [2], characterized in that it is [4] The toilet paper is provided with an emboss, and the outer winding region emboss depth measured for the outer winding region is smaller than the inner winding region emboss depth measured for the inner winding region. The outer winding region emboss depth is 80 μm or more and 115 μm or less, and the inner winding region emboss depth is 85 μm or more and 145 μm or less. The toilet roll according to any one of [1] to [3], characterized in that it is [5] A toilet roll in which toilet paper with a ply number p (p is an integer of 2 or more) is Around the paper tube wound in a roll shape, The ply number p and the roll length L (m) satisfy the relationship L ≧ 90 / p. The outer winding density ODE of the toilet roll calculated for the outer winding area of the toilet roll corresponding to the area of the toilet paper where the length from the end on the roll center side of the toilet roll is in the range of 85% or more and 95% or less of the winding length L is higher than the inner winding density IDE of the toilet roll calculated for the inner winding area of the toilet roll corresponding to the area of the toilet paper where the length from the end on the roll center side of the toilet roll is in the range of 5% or more and 15% or less of the winding length L. [6] The outer winding density ODE calculated as the winding density of the roll-shaped portion where the toilet paper is wound up to 90% of the winding length L from the end on the roll center side of the toilet roll 90 is 1.00 times greater than and 1.50 times or less than the inner winding density IDE calculated as the winding density of the roll-shaped portion where the toilet paper is wound up to 10% of the winding length L from the end on the roll center side of the toilet roll. 10 The toilet roll according to [5], characterized in that it is greater than 1.00 times and 1.50 times or less than that. [7] The outer winding density ODE is 1.10 m / cm 2 or more and 1.75 m / cm 2 or less, and the inner winding density IDE is 0.90 m / cm 2 or more and 1.40 m / cm 2 or less. The toilet roll according to [5] or [6], characterized in that it is as described above. [8] The toilet roll according to any one of [5] to [7], characterized in that the toilet paper is provided with an emboss. [9] The toilet roll according to [8], characterized in that the emboss is a single emboss.

Advantages of the Invention

[0009] According to the present invention, it is possible to provide a toilet roll in which the difference in the texture of toilet paper at the start and end of use of the toilet roll is suppressed. According to the present invention, even when the roll diameter of a toilet roll with a long roll length is compactly stored within a predetermined dimension, it is possible to reduce the change in the texture of the toilet paper from the start to the end of use of the toilet roll. Therefore, according to the present invention, it is possible to provide a toilet roll with a long roll length that has a roll diameter within a predetermined dimension that can be rotatably stored in a general toilet roll holder and has a small change in the texture of the toilet paper from the start to the end of use. Further, according to the present invention, it is possible to save space when carrying and storing the toilet roll.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0011] Hereinafter, a toilet roll according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same or similar configurations. The following embodiments and drawings are described for illustrative purposes and do not limit the present invention.

[0012] The first to fourth embodiments of the present invention described below relate to a single-ply toilet roll in which a so-called single-ply toilet paper formed of a single sheet is wound. Further, the fifth to ninth embodiments relate to a multi-ply toilet roll in which a so-called multi-ply toilet paper formed of two or more sheets is wound.

[0013] (First Embodiment) [Toilet Roll] FIG. 1 is a schematic perspective view for explaining the configuration of a toilet roll according to the first embodiment of the present invention.

[0014] Referring to FIG. 1, a toilet roll 10 according to the first embodiment of the present invention is a single-ply toilet roll in which a so-called single-ply toilet paper 13 formed of a single sheet 11 is wound around a paper tube 14, which is a cylindrical core, by a predetermined length L in a roll shape.

[0015] [Sheet] The sheet 11, which is a component of the toilet paper 13, is obtained by papermaking a slurry containing a pulp component as a fiber raw material.

[0016] [Pulp Component] Examples of the pulp component include wood pulp, non-wood pulp, and waste paper pulp.

[0017] Examples of the wood pulp produced from wood as a raw material include chemical pulps such as hardwood pulp (hardwood kraft pulp (LKP)), softwood pulp (softwood kraft pulp (NKP)), sulfite pulp (SP), dissolving pulp (DP), soda pulp (AP), unbleached kraft pulp (UKP), oxygen bleached kraft pulp (OKP), etc. Further, semi-chemical pulps such as semi-chemical pulp (SCP) and chemigroundwood pulp (CGP), and mechanical pulps such as groundwood pulp (GP) and thermomechanical pulp (TMP, BCTMP) are included, but are not particularly limited.

[0018] Examples of non-wood pulp produced from plants or animals other than wood include cotton-based pulp such as cotton linter and cotton lint, non-wood pulp such as hemp, wheat straw, and bagasse, cellulose, chitin, chitosan, etc. isolated from jellyfish and seaweed, etc., but are not particularly limited.

[0019] Recycled pulp is pulp produced using waste paper, that is, pulp that has been once formed into paper, as a raw material. Examples of recycled pulp include so-called milk carton pulp using paper packs for filling and packaging liquids such as milk cartons as raw materials, and deinked pulp using newspapers and magazines as raw materials, etc., but are not particularly limited.

[0020] As the pulp component, one of the above may be used alone, or two or more may be mixed and used. Since these pulp components greatly affect the quality of the toilet paper 13, they are appropriately blended in a predetermined type and blending ratio according to the required quality. For example, only wood pulp can be used (at 100% by mass) as the pulp component.

[0021] As the wood pulp, at least one selected from softwood pulp and hardwood pulp can be preferably used. Softwood pulp has long and strong fibers and can impart strength to the sheet to be formed. Also, hardwood pulp has short and flexible fibers and can provide uniformity, good texture, softness, etc. to the sheet to be formed. In the embodiments of the present invention, it is preferable to use softwood pulp and hardwood pulp in combination, and it is more preferable to use softwood kraft pulp (NKP) and hardwood kraft pulp (LKP) in combination.

[0022] When using softwood pulp and hardwood pulp in combination, the L / N ratio indicating the blending ratio (mass ratio) of softwood pulp and hardwood pulp is preferably, for example, 10 / 90 to 90 / 10, more preferably 20 / 80 or more, still more preferably 30 / 70 or more, even more preferably 60 / 40 or more, and also more preferably 80 / 20 or less, and still more preferably 70 / 30 or less.

[0023] [Optional component] For the required quality and stable operation of Sheet 11, various chemicals may be added as optional components. Examples of the optional components include, for example, dry paper strengthening agents, wet paper strengthening agents, softeners, bulking agents, dyes, fragrances, dispersants, drainage improvers, pitch control agents, yield improvers, sizing agents, etc. Examples of the dry paper strengthening agents include, for example, cationized starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC), etc. Examples of the wet paper strengthening agents include polyamide epichlorohydrin, urea, melamine, thermally crosslinkable polyacrylamide, etc. Examples of the softeners include, for example, anionic surfactants, nonionic surfactants, cationic surfactants, and zwitterionic surfactants, etc. The above optional components may be used alone or in combination of two or more.

[0024] [Toilet paper] In the first embodiment of the present invention, the toilet paper 13 is a single-ply toilet paper and is composed of one sheet 11. In this specification, the toilet paper 13 and the sheet 11 can be interpreted synonymously. The toilet paper 13 may be embossed for the purpose of improving the touch feeling such as softness and the cosmetic property, and may also be formed with a perforation for easy separation.

[0025] [Basis weight of toilet paper / Basis weight of sheet] The basis weight of the toilet paper 13 is the basis weight of one sheet 11 that constitutes the single-ply toilet paper 13. The basis weight of the toilet paper 13 can be obtained by measuring the basis weight of the sheet 11 in accordance with the provisions of Japanese Industrial Standard JIS P8124.

[0026] In an embodiment of the present invention, the basis weight of the toilet paper 13 is preferably 13.0 g / m 2 or more and 21.0 g / m 2 or less, and more preferably 14.0 g / m 2 or more and 19.0 g / m 2 or less.

[0027] When the basis weight is lower than 13.0 g / m 2 in general, the usability deteriorates due to a decrease in water absorption capacity due to a decrease in the pulp content, etc., and the strength of the toilet paper 13 decreases, making it easier for unintended breakage to occur.

[0028] When the basis weight is higher than 21.0 g / m 2 in general, the paper thickness of the toilet paper 13 increases, making it difficult to maintain the roll diameter DR of the toilet roll 10 at a predetermined dimension.

[0029] When the basis weight of the toilet paper 13 is within the range of 13.0 g / m 2 or more and 21.0 g / m 2 or less, it becomes easy to maintain the roll diameter DR of the toilet roll 10 at a predetermined dimension while ensuring the strength, water absorption capacity, and usability of the toilet paper 13.

[0030] In this example, one end of the toilet paper 13 is adhesively fixed to the outer periphery of the paper tube 14 with pickup glue (adhesive). Thereby, the toilet paper 13 is prevented from peeling off and detaching from the paper tube 14.

[0031] [Paper tube] The paper tube 14 has a cylindrical shape, and toilet paper 13 is wound around it to form a toilet roll 10. The core diameter DC, which is the outer diameter of the paper tube 14, is set according to the size of the members (such as core cores and hooks) of the toilet roll holder for rotatably supporting the toilet roll 10. The core diameter is preferably 37 mm or more and 42 mm or less, more preferably 38 mm or more and 41 mm or less.

[0032] [Winding diameter of the toilet roll] Referring to FIG. 1, the winding diameter of the toilet roll 10 refers to the roll diameter (diameter) of the toilet paper 13 wound in a roll shape on the toilet roll 10.

[0033] In the embodiment of the present invention, the winding diameter DR of the toilet roll 10 as a product specification, that is, before the start of use, is set to a size that can fit into a general toilet roll holder and be rotatably supported therein. The winding diameter DR of the toilet roll 10 is preferably 105 mm or more and 130 mm or less, more preferably 110 mm or more and 125 mm or less, and even more preferably greater than 110 mm and less than 125 mm.

[0034] If the winding diameter DR of the toilet roll 10 is less than 105 mm, the winding length of the toilet roll 10 may be restricted. Also, if an attempt is made to ensure a long winding length of the toilet roll 10 with a winding diameter of less than 105 mm, the paper thickness, basis weight, etc. of the toilet paper 13 used for the toilet roll 10 will be restricted, making it difficult to ensure strength, etc. Alternatively, pressure is applied to the toilet paper 13 by being tightly wound, resulting in deterioration of its texture and usability. Also, if an emboss is applied, the emboss may be crushed, deteriorating the cosmetic appearance of the toilet roll 10.

[0035] The winding diameter can be measured using, for example, calipers. Since the roll shape of the toilet roll is not necessarily a perfect circle, the roll diameter (diameter) may be measured at a plurality of locations in the circumferential direction of the roll, and the winding diameter may be obtained as the average value.

[0036] [Width of toilet roll] The width H of the toilet roll 10 refers to the length of the toilet roll in the width direction (CD) of the toilet paper 13 wound around the toilet roll 10. Generally, due to the manufacturing method including the process of obtaining a toilet roll of the product width by cutting a wide toilet roll, the width and length of the toilet paper 13 wound around the toilet roll 10 are equal. In an embodiment of the present invention, the width H of the toilet roll 10 is set to a length that can fit within a general toilet roll holder and be rotatably supported therein. The width H of the toilet roll 10, that is, the width of the toilet paper 13, may be, for example, 110 mm to 120 mm, and is often about 114 mm. The width can be measured using, for example, calipers or a measuring tape.

[0037] [Wound length of toilet roll] The wound length of the toilet roll 10 refers to the length of the toilet paper 13 wound in a roll shape around the toilet roll 10. In an embodiment of the present invention, the wound length L of the toilet roll 10 before use as a product specification is 90 m or more, preferably 90 m or more and 180 m or less, more preferably 100 m or more and 150 m or less. Further preferably, when an emboss is applied to the toilet paper 13, it is 110 m or more and 140 m or less, and when no emboss is applied, it is 120 m or more and 150 m or less.

[0038] If the wound length L of the toilet roll 10 is less than 90 m, the wound length per roll is short, and when the roll diameter DR is kept within a predetermined dimension range, the desired space-saving effect during carrying and storage of the toilet roll 10 cannot be obtained. Also, when using the toilet roll 10, frequent replenishment of the toilet roll 10 is required due to it being used up quickly.

[0039] When the roll length L of the toilet roll 10 is 90 m or more, the length of the toilet paper 13 per roll is long, and when the roll diameter DR is kept within a predetermined dimension, the effect of space saving during carrying and storage of the toilet roll 10 can be obtained.

[0040] If the roll length L of the toilet roll 10 is too long, generally, the roll diameter DR of the toilet roll 10 becomes large, and it becomes difficult for the toilet roll 10 to fit into a general toilet roll holder. At this time, if an attempt is made to keep the roll diameter DR of the toilet roll 10 within a predetermined dimension, the pressure applied to the toilet paper 13 inside the toilet roll 10 increases due to tight winding, and the texture, usability, and cosmetic appearance of the toilet roll tend to deteriorate.

[0041] The roll length L of the toilet roll 10 can be obtained, for example, by actual measurement.

[0042] [Roll density of toilet roll] In this specification, the roll density DE of the toilet roll 10 refers to the value obtained by dividing the value obtained by multiplying the roll length L of the toilet roll 10 by the ply number p (p = 1 in this example) by the roll cross-sectional area A of the toilet roll 10. The roll density of the toilet roll is an index indicating the tightness of the winding of the toilet paper 13 wound in a roll shape in the toilet roll 10. Generally, the higher the roll density, the tighter the winding, and the lower the roll density, the looser the winding.

[0043] Specifically, the roll density of the toilet roll 10 is calculated by the following formula (I).

[0044] (Roll density DE (m / cm 2 )) = (Roll length L (m) × Ply number p) ÷ (Roll cross-sectional area A (cm 2 )) ··· (I)

[0045] Figs. 2(c) to (e) are schematic views showing cross-sections of the toilet roll 10 taken along a direction perpendicular to the axial direction of the toilet roll 10.

[0046] Referring to FIG. 2(c), the roll cross-sectional area A of the toilet roll 10 with a roll length L is the area occupied by an annular-shaped portion (hatched portion in the figure) having an outer diameter OD and an inner diameter ID formed by the wound toilet paper 13 in the cross-section of the toilet roll 10 taken along the direction perpendicular to the axial direction of the toilet roll 10. The roll cross-sectional area A corresponds to the area of a circle with the outer diameter OD as the diameter minus the area of a circle with the inner diameter ID as the diameter.

[0047] The outer diameter OD of the annular-shaped portion corresponds to the winding diameter DR of the toilet roll 10. Also, the inner diameter ID of the annular-shaped portion corresponds to the core diameter DC of the paper tube 14. Therefore, the roll cross-sectional area A of the toilet roll 10 can be calculated by the following formula (II).

[0048] (Roll cross-sectional area A (cm 2 )) = {((Winding diameter DR (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14)} ··· (II)

[0049] For example, when the roll length L of the toilet roll 10 is 120 m, the winding diameter DR is 114 mm, and the core diameter DC of the paper tube 14 is 40 mm, in the embodiment of the present invention, since the toilet paper 13 is single-ply and the ply number p is 1, from the above formulas (I) and (II), the winding density DE is (120 m × 1) ÷ {((11.4 cm ÷ 2) 2 × 3.14 - (4.0 cm ÷ 2) 2 × 3.14)}, and by calculation, it is 1.34 m / cm 2 and becomes.

[0050] [Outer winding area of toilet roll] Figures 2(a) and 2(b) are schematic diagrams showing the states before and after unwinding toilet paper 13 from a toilet roll 10 with a roll length L. Referring to Figure 2(b), the outer winding region OR of the toilet roll refers to the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 85% or more and 95% or less of the roll length L of the toilet roll 10. Referring to Figure 2(a), the outer winding region OR forms a cylindrical shape within the toilet roll 10.

[0051] [Inner winding region of the toilet roll] Referring to Figure 2(b), the inner winding region IR of the toilet roll refers to the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 5% or more and 15% or less of the roll length L of the toilet roll 10. Referring to Figure 2(a), the inner winding region IR forms a cylindrical shape within the toilet roll 10. Referring to Figure 2(a), the outer winding region OR of the toilet roll 10 is located on the outer peripheral side of the roll, farther from the center of the roll in the radial direction of the toilet roll 10 than the inner winding region IR.

[0052] [Outer winding density of the toilet roll] The outer winding density ODE of the toilet roll 10 refers to the winding density of the toilet roll 10 calculated for the outer winding region OR of the toilet roll 10.

[0053] Figure 2(d) shows the toilet roll 10 in a state where the toilet paper 13 is being unwound from the toilet roll 10 with a roll length L shown in Figure 2(c), and the outer winding region OR of the toilet paper 13 appears on the surface of the toilet roll 10, with the roll length OL being in the range of 0.85L to 0.95L. The winding density of the roll-shaped portion of the toilet roll 10 around which the toilet paper 13 has been wound up to this roll length OL becomes the outer winding density ODE of the toilet roll 10.

[0054] In this state, the winding diameter ODR of the toilet roll 10 can be obtained by actual measurement. The outer winding density ODE can be obtained by the following formulas (I') and (II') by applying the above formulas (I) and (II).

[0055] (Outer winding density ODE (m / cm 2 )) = (Winding length OL (m) × Ply number p) ÷ (Roll cross-sectional area OA (cm 2 )) ···(I’)

[0056] (Roll cross-sectional area OA (cm 2 )) = {((Winding diameter ODR (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14)} ···(II’)

[0057] In the formula, the ply number p is 1, and the winding length OL is a length in the range of 0.85L to 0.95L. When the winding length L of the toilet roll 10 shown in Fig. 2(c) is 120 m, the winding length OL of the roll-shaped portion of the toilet roll 10 shown in Fig. 2(d) is in the range of 102 m to 114 m.

[0058] [Inner winding density of toilet roll] The inner winding density IDE of the toilet roll 10 refers to the winding density of the toilet roll 10 calculated for the inner winding region IR of the toilet roll 10.

[0059] Fig. 2(e) shows the toilet roll 10 in a state where the toilet paper 13 is unwound from the toilet roll 10 with a winding length L, and the winding length IL of the toilet paper 13 is set to a length in the range of 0.05L to 0.15L so that the inner winding region IR of the toilet paper 13 appears on the surface of the toilet roll 10. The winding density of the roll-shaped portion of the toilet roll 10 around which the toilet paper 13 is wound up to this winding length IL becomes the inner winding density IDE of the toilet roll 10.

[0060] In this state, the winding diameter IDR of the toilet roll 10 can be obtained by actual measurement. The inner winding density IDE can be obtained by the following formulas (I'') and (II'') by applying the above formulas (I) and (II) mutatis mutandis.

[0061] (Inner winding density IDE (m / cm 2 )) = (Winding length IL (m) × Ply number p) ÷ (Roll cross-sectional area IA (cm 2 )) ··· (I'')

[0062] (Roll cross-sectional area IA (cm 2 )) = {((Winding diameter IDR (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14)} ··· (II'')

[0063] In the formula, the ply number p is 1, and the winding length IL is a length in the range of 0.05L to 0.15L. When the winding length L of the toilet roll 10 shown in Fig. 2(c) is 120 m, the winding length IL of the roll-shaped portion of the toilet roll 10 shown in Fig. 2(d) is in the range of 6 m to 18 m.

[0064] Similarly, for a predetermined region in the roll radius direction of the toilet roll 10 other than the outer winding region OR and the inner winding region IR of the toilet roll 10, the winding density of the toilet roll 10 can be calculated. That is, the winding density of the roll-shaped portion wound around the paper tube 14 by a region of the toilet paper 13 having an arbitrary length shorter than the winding length L of the toilet roll 10 can be calculated by applying formulas (I) and (II) mutatis mutandis.

[0065] When the winding density in the case where "an arbitrary length shorter than the winding length L of the toilet roll 10" expressed as a percentage of the total length winding length L of the toilet paper 13 is n% (0 < n < 100) is denoted as the winding density DEn, the outer winding density ODE corresponds to the winding density DEn (85 ≤ n ≤ 95), and the inner winding density IDE corresponds to the winding density DEn (5 ≤ n ≤ 15).

[0066] The toilet roll 10 according to the first embodiment of the present invention is a toilet roll in which single-ply toilet paper is wound in a roll shape, the winding length is 90 m or more, and the length from the end 13e on the roll center side of the toilet roll 10 is 85% or more and 95% or less of the winding length L of the toilet roll 10. The outer winding density ODE, which is the winding density of the toilet roll calculated with respect to the outer winding region OR of the toilet roll, which is the region of the toilet paper 13, is higher than the inner winding density IDE, which is the winding density of the toilet roll calculated with respect to the inner winding region IR of the toilet roll, which is the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is 5% or more and 15% or less of the winding length L of the toilet roll 10.

[0067] That is, in the present embodiment, the outer winding density ODE corresponding to the winding density DEn (85 ≤ n ≤ 95) is higher than the inner winding density IDE corresponding to the winding density DEn (5 ≤ n ≤ 15).

[0068] [Advantages and effects] In a conventional toilet roll, generally, a higher pressure (internal pressure) is applied to a region relatively located on the roll center side in the radial direction of the toilet roll 10 than to a region relatively located on the roll outer peripheral side in the radial direction of the toilet roll 10. Further, when a high pressure is applied to the toilet paper inside the toilet roll, a reduction in paper thickness due to compression (densification of the toilet paper) or, if an emboss is applied, crushing of the emboss occurs, leading to deterioration in the texture of the toilet paper and the cosmetic appearance of the toilet roll. This phenomenon is prominent in toilet paper with a long winding length.

[0069] In response to such problems of conventional toilet rolls, in the toilet roll 10 according to an embodiment of the present invention, the outer winding density ODE calculated for the outer winding region OR that is relatively located on the outer peripheral side of the roll in the radial direction of the toilet roll 10 is higher than the inner winding density IDE calculated for the inner winding region IR that is relatively located on the roll center side in the radial direction of the toilet roll 10. The winding density of the toilet roll is adjusted according to the position in the radial direction of the toilet roll.

[0070] That is, in the present invention, the inner winding density IDE is made relatively smaller than the outer winding density ODE. Thereby, even in the toilet roll 10 with a long single-ply winding length, the pressure applied to the toilet paper 13 in the inner winding region IR can be reduced. As a result, it is possible to suppress a reduction in paper thickness (high densification of the toilet paper) due to compression caused by internal pressure and the crushing of the emboss when the emboss is applied.

[0071] Therefore, according to the present invention, it is possible to suppress a difference in the texture of the toilet paper at the start and end of use of the toilet roll 10.

[0072] Further, in the present embodiment, furthermore, in a region different from the outer winding region OR and the inner winding region IR, such as an intermediate region located between the outer winding region OR and the inner winding region IR (for example, a region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is greater than 15% and less than 85% of the winding length L of the toilet roll 10), the winding density may be adjusted. For example, it may be configured such that the winding density gradually decreases from the inner winding region IR toward the outer winding region OR in the intermediate region. According to this, the effect of suppressing the difference in texture in the longitudinal direction of the toilet paper is increased, and the change in the texture of the toilet paper from the start to the end of use of the toilet roll can be reduced.

[0073] [Manufacturing Apparatus and Method Applicable to the Manufacture of a Toilet Roll According to an Embodiment of the Present Invention] While referring to FIG. 3, an example of a manufacturing apparatus and a manufacturing method applicable to manufacturing the toilet roll 10 according to an embodiment of the present invention will be described. Specifically, the toilet roll 10 whose configuration is shown in FIGS. 1 and 2 can be manufactured, for example, as follows.

[0074] [Manufacture of the original reel] First, an original reel 11R for manufacturing the sheet 11 which is a component of the toilet paper 13 is manufactured. Specifically, using a paper making machine (not shown), a wide (a width several times to about twenty times the width H of the toilet roll) and long sheet 11L is made from a papermaking slurry (paper stock) while being wound up, and a single-ply original reel 11R around which the sheet 11L is wound is manufactured.

[0075] As the paper making machine, for example, known paper making machines such as a twin wire former method, a cylinder former method, a suction press former method, a crescent former method, etc. can be used.

[0076] The paper making machine may be provided with a creping section for performing creping. In the creping section, during the drying of the sheet (web) being made in the original reel manufacturing process, if necessary, very fine wavy wrinkles called crepe can be imparted to the sheet by a creping doctor. By the crepe, softness, bulkiness (bulk feeling), absorbency, aesthetics (shape of the crepe), good touch feeling, etc. can be imparted to the sheet.

[0077] Also, the paper making machine may be provided with a calendar section. In the calendar section, the dried sheet can be subjected to a calendar process of sandwiching and pressing the sheet from above and below by a pair of calendar rolls if necessary. As a result, the sheet 11L is compressed, and the paper thickness is adjusted and made uniform, and the surface is smoothed. Note that the calendar processing section may be provided separately from the paper making machine, and the calendar process may be performed in any manufacturing process after the original reel manufacturing process. The calendar process may be performed in multiple stages.

[0078] [Manufacture of Toilet Roll] FIG. 3 is a schematic diagram showing an example of a manufacturing apparatus that can be used for manufacturing the toilet roll 10 according to an embodiment of the present invention.

[0079] [Example of Toilet Roll Manufacturing Apparatus] FIG. 3 shows a configuration example of a manufacturing apparatus capable of manufacturing the toilet roll 10 using the mother roll 11R.

[0080] The mother roll 11R is rotatably attached to the mother roll stand and feeds out the sheet 11L while being rotationally driven by a sheet feeding device (not shown).

[0081] The speed at which the sheet 11L is fed out from the mother roll 11R is referred to as the sheet feeding speed Vu. As the sheet feeding device, any known device that can feed out the sheet 11L from the mother roll 11R at a predetermined feeding speed and can change such a feeding speed steplessly can be used. The sheet feeding device may adjust the feeding speed of the sheet 11L, for example, by controlling the number of rotations of a drive unit capable of rotationally driving a shaft passed through the core of the mother roll 11R. Alternatively, the sheet feeding device may adjust the feeding speed of the sheet 11L by controlling the rotational driving speed of a rotational driving belt that abuts on the outer periphery of the mother roll 11R and rotationally drives the mother roll 11R. The control of the number of rotations or the rotational driving speed for adjusting the feeding speed can be performed, for example, by changing the supply voltage or supply current to the drive unit.

[0082] The sheet 11L fed out from the mother roll 11R is wound around and guided by the guide roll 30 and conveyed to the embossing section 21 arranged on the downstream side of the mother roll stand. On the downstream side of this embossing section 21, a perforation forming section 25 and a winding section 26 are further arranged in sequence.

[0083] [Embossing Section] The sheet 11L may be provided with embossments. The embossing unit 21 is, in short, a unit that performs embossing on the sheet 11L and applies embossments over substantially the entire area of the paper surface. Embossing refers to a process of forming embossed protrusions on one surface of the sheet to be embossed and embossed recesses formed on the back side of the embossed protrusions on the other surface.

[0084] The embossing unit 21 includes a roll set consisting of an embossing roll and a backup roll. The backup roll can be displaced by any known means such as, for example, an air cylinder.

[0085] The backup roll may be configured to be selectively displaceable between a first position in contact with the embossing roll and a second position spaced apart from the embossing roll by the displacement of the backup roll.

[0086] The embossing roll is a roll having uneven portions corresponding to a desired embossing pattern on its outer peripheral surface. In this example, uneven portions corresponding to the embossing pattern of the toilet paper 13 (sheet 11) shown in Fig. 4(a) are formed on the outer peripheral surface of the embossing roll. At least the uneven portions of the embossing roll are formed of metal, and the embossing roll may be a male (convex) steel roll. This embossing roll is configured to be rotationally driven by a driving means (not shown).

[0087] The backup roll is a driven roll used in contact with the embossing roll and has a cylindrical outer shape. The surface portion of the backup roll is formed of a hard rubber-like elastic body such as a hard synthetic rubber that can be elastically deformed.

[0088] Referring to FIG. 3, when performing embossing, the sheet 11L conveyed from the raw material roll 11R to the embossing section 21 is inserted into a paper passage that passes between the backup roll and the embossing roll. While the sheet 11L is pressed against the embossing roll by the backup roll, it receives the driving force of the embossing roll and is sent out to the downstream side of the roll set. Due to the pressing between this backup roll and the embossing roll, an emboss is formed on the sheet 11L.

[0089] In addition, when manufacturing a non-embossed toilet roll or the like, when embossing of the sheet 11L is not required, the sheet 11L conveyed from the raw material roll 11R may be guided only by the backup roll and guided to the downstream side without contacting the embossing roll.

[0090] The sheet 11L that has passed through the embossing section 21 is wound around a guide roll 32 arranged on its downstream side.

[0091] [Guide roll / Expander roll] The guide roll 32 guides the sheet 11L sent out from the embossing section 21 to the downstream side. The guide roll 32 may be an expander roll.

[0092] An expander roll is a roll for removing wrinkles and shrinkage of the sheet that occur during sheet running. Those used in the papermaking process and coating process in the field of papermaking technology can be used, and there is no particular limitation on the type of applicable expander roll.

[0093] Examples of applicable expander rolls include a rubber expander roll in which a rubber cylinder is rotatably attached via a spool with a built-in ball bearing on the outer periphery of a non-rotating shaft curved in an arc shape, or a steel expander roll without a rubber cylinder covering it, an expander roll with a curved overall shape and provided with spiral grooves, a worm roll with a straight overall shape and spiral grooves symmetrically provided from the central portion on the surface of the roll that rotates integrally with the rotating shaft, and the like.

[0094] When the expander roll 32 is a curved roll, as the curved roll rotates around the stationary shaft, due to its widening effect, the sheet 11L can be pushed outward from the central portion, stretching the wrinkles and removing the shrinkage. This is based on the principle that when the sheet 11L flows while having a sufficient contact angle with a general straight roll (a roll with a straight overall shape and no grooves formed), the sheet 11L advances in a direction perpendicular to the roll axis.

[0095] When the expander roll 32 is a roll with a straight overall shape, the sheet 11L that contacts the surface of the roll rotating integrally with the rotating shaft is pushed out along the spiral grooves symmetrically extending from the central portion of the expander roll 32 provided on the surface of the expander roll 32 so as to be widened. Thereby, the wrinkles of the sheet 11L can be stretched and the shrinkage can be removed.

[0096] Referring to FIG. 3, a feeding means F for feeding the sheet 11L into the perforation forming portion 25 is provided between the embossing portion 21 and the perforation forming portion 25 on its downstream side. The expander roll 32 is provided on the upstream side of the feeding means F, preferably in the vicinity of the upstream side of the feeding means F, to remove the wrinkles and shrinkage of the traveling sheet 11L that will be fed into the feeding means F. Thereby, it is possible to prevent the occurrence of wrinkles that may occur by passing the sheet 11L through the feeding means F without passing through the expander roll 32.

[0097] The sheet 11L guided by the guide roll or the expander roll 32 is fed into the feeding means F arranged on the downstream side thereof.

[0098] [Feeding means] In an embodiment of the present invention, the feeding means F refers to means configured to be able to feed out the long sheet fed in with a driving force.

[0099] Examples of the feeding means F include, for example, feed rolls. The feed roll has a configuration including at least one driving roll (also referred to as a feed roll) having a structure such that no slippage occurs between the feed roll and the sheet 11L. The feed roll may be, without limitation, in the form of a roll (also referred to as a pinch roll) that sandwiches the sheet 11L between two rolls and presses them against each other with a certain pressure from above and below (both sides of the sheet 11L) to regulate its feeding, or may include a feed roll and a nip roll, and the nip roll applies pressure to the sheet 11L against the feed roll and presses it, and the feeding is performed by the driving force of the feed roll, or may take any other known form.

[0100] The sheet 11L is fed into the perforation forming section 25 arranged on the downstream side thereof by the feeding means F.

[0101] [Perforation forming section] Perforations may be formed in the sheet 11L. The perforation forming section 25 is, in short, a unit that forms perforations in the fed sheet and performs perforation forming.

[0102] The perforation forming section 25 is configured to be able to form breaking perforations across the width direction of the sheet 11L at regular intervals along the longitudinal direction (MD direction) of the sheet 11L. Any known perforation forming means can be used for forming the breaking perforations.

[0103] In this example, the stitch forming means is a rotatable rotary blade holder 28h, to which a comb-shaped cutter 28c with a discontinuous cutting edge that forms a straight line along a direction parallel to the rotation axis of the rotary blade holder is attached. The stitch forming means further includes a fixed blade holder 29h that is held in a fixed state facing the rotary blade holder 28h, to which a straight cutter 29c with a cutting edge that is continuously straight along a direction parallel to the rotation axis of the rotary blade holder 28h is attached.

[0104] The stitch forming means passes the long sheet 11L between the comb-shaped cutter 28c of the rotary blade holder 28h and the straight cutter 29c of the fixed blade holder 29h. Thereby, perforations corresponding to the cutting edges of the comb-shaped cutter 28c are formed across both side edges in the width direction of the sheet 11L.

[0105] More specifically, the sheet 11L passes across the cutting edge of the straight cutter 29c attached to the fixed blade holder 29h, and the comb-shaped cutter 28c of the rotary blade holder 28h rotates at a peripheral speed corresponding to the passing speed of the sheet 11L. When the comb-shaped cutter 28c passes through the straight cutter 29c, perforations are formed in the sheet 11L. The perforations formed by the comb-shaped cutter 28c and the straight cutter 29c extend across both side edges in the width direction of the sheet 11L and serve as perforations for breaking to cut the sheet 11L along its width direction.

[0106] When perforations are not required, the rotary blade holder 28h is held in a position and posture such that the cutting edge of the comb-shaped cutter 28c of the rotary blade holder 28h does not contact the sheet 11L, so that the sheet 11L can pass through without contacting either the cutting edge of the comb-shaped cutter 28c of the rotary blade holder 28h or the cutting edge of the straight cutter 29c.

[0107] The sheet 11L that has passed through the stitch forming section 25 is sent to a winding section 26 arranged on the downstream side thereof.

[0108] [Take-up Unit] The take-up unit 26 wraps the leading end of the sheet 11L sent out from the perforation forming unit 25 around a core (paper tube 14L) that is long in the axial direction through an adhesive, winds the sheet 11L around the paper tube 14L by a predetermined length, and then cuts the trailing end of the sheet 11L with a cutter roll 33, which is a cutting means, to form a wide toilet roll 10L, that is, a toilet roll 10L having a large dimension in the CD direction. This wide toilet roll 10L is also referred to as a take-up roll.

[0109] Specifically, the take-up unit 26 includes a winding roll W, a nip roll N, and a bed roll B. The winding roll W, the nip roll N, and the bed roll B are arranged so as to surround a paper tube 14L mounted on the manufacturing apparatus for winding the sheet 11L. The winding roll W, the nip roll N, and the bed roll B can each be rotationally driven by a drive device (not shown) so that their speeds can be changed steplessly. The control of the rotational drive speed of each roll can be performed by changing the supply voltage or supply current to the drive device.

[0110] The sheet 11L sent out from the perforation forming unit 25 is wound around the winding roll W in the take-up unit 26, then passed between the nip roll N and the paper tube 14L, and further passed between the bed roll B and the paper tube 14L, and is wound around the paper tube 14L. The winding roll W, the nip roll N, and the bed roll B are in contact with the outer periphery of the sheet 11L wound around the paper tube 14L and are rotationally driven in their respective rotational directions indicated by arrows in FIG. 3. As a result, the sheet 11L is wound around the paper tube 14L in a roll shape, and the toilet roll 10L is formed.

[0111] The wide toilet roll 10L, that is, the take-up roll 10L formed in this way is then cut by a cutting unit (not shown) to a predetermined width H according to product specifications and the like to become individual toilet rolls 10.

[0112] [Means for Achieving the Invention] As described above, the toilet roll 10 according to the embodiment of the present invention is characterized in that the outer winding density ODE calculated with respect to the outer winding region OR located relatively on the outer peripheral side of the roll in the radial direction of the toilet roll 10 is higher than the inner winding density IDE calculated with respect to the inner winding region IR located relatively on the roll center side in the radial direction of the toilet roll 10. An example of means for achieving the configuration of the present invention that satisfies the relationship of the winding density according to the position in the radial direction within the toilet roll 10 will be described.

[0113] In the manufacturing apparatus of FIG. 3, the winding speed Vw of the sheet 11L by the rotation of the winding roll W of the winding unit 26 is a speed higher than the feeding speed Vu of the sheet 11L from the mother roll 11R by the sheet feeding function and preferably has a constant speed difference. Thereby, the tension of the sheet 11L is adjusted (also referred to as "draw adjustment") between the mother roll 11R and the winding roll (toilet roll 10L). The draw adjustment is performed to prevent the occurrence of inconveniences such as excessive tension in the sheet 11L, slackening of the sheet 11L, paper breakage, and paper wrinkling during the winding roll forming process from feeding the sheet 11L from the mother roll 11R to winding it on the winding roll 10L.

[0114] By appropriately adjusting the rotational speed Vn of the nip roll N or the rotational speed Vb of the bed roll B located downstream with respect to the winding speed Vw of the winding roll W determined in this way, the winding density of the toilet roll 10 according to the embodiment of the present invention can be achieved.

[0115] Specifically, for example, when the relative magnitude relationship of the speeds is "the rotational speed Vn of the nip roll N > the winding speed Vw of the winding roll W", since the rotational speed of the roll N on the downstream side is higher than the rotational speed (winding speed) of the roll W on the upstream side, the sheet 11L is wound while receiving tension between the two rolls, and the winding density increases. Therefore, in the winding process of the toilet roll 10L, by performing speed control so that the speed difference between the rotational speed Vn and the winding speed Vw is larger in the winding end (outer winding region OR) than in the winding start (inner winding region IR) of the sheet 11L, the winding density can be increased with respect to the outer winding region OR compared to the inner winding region IR. At this time, by setting the rotational speed Vb of the bed roll B located further downstream than the nip roll N to "the rotational speed Vb of the bed roll B ≧ the rotational speed Vn of the nip roll N", a toilet roll 10L in which the occurrence of slack, winding wrinkles, etc. is suppressed can be obtained. When the rotational speed Vb of the bed roll B and the rotational speed Vn of the nip roll N are made the same, unnecessary tension is prevented from being applied to the sheet 11L.

[0116] Similarly, for example, when the relative magnitude relationship of the speeds is "the rotational speed Vb of the bed roll B > the winding speed Vw of the winding roll W", since the rotational speed of the roll B on the downstream side is higher than the rotational speed (winding speed) of the roll W on the upstream side, the sheet 11L is wound while receiving tension between the two rolls, and the winding density increases. Therefore, in the winding process of the toilet roll 10L, by performing speed control so that the speed difference between the rotational speed Vb and the winding speed Vw is larger in the winding end (outer winding region OR) than in the winding start (inner winding region IR) of the sheet 11L, the winding density can be increased with respect to the outer winding region OR compared to the inner winding region IR.

[0117] At this time, the rotational speed Vn of the nip roll N, which is downstream of the winding roll W and upstream of the bed roll B, may satisfy "the rotational speed Vb of the bed roll B ≥ the rotational speed Vn of the nip roll N ≥ the winding speed Vw of the winding roll W". In particular, by setting "the rotational speed Vb of the bed roll B = the rotational speed Vn of the nip roll N > the winding speed Vw of the winding roll W" or "the rotational speed Vb of the bed roll B > the rotational speed Vn of the nip roll N = the winding speed Vw of the winding roll W", a relatively large tension can be applied to the sheet 11L, and the winding density can be easily increased.

[0118] Alternatively, by appropriately adjusting the feeding speed Vf of the feed roll F located upstream with respect to the winding speed Vw of the winding roll W, the winding density of the toilet roll 10 according to the embodiment of the present invention can be achieved.

[0119] Specifically, for example, when the relative magnitude relationship of the speeds is "the winding speed Vw of the winding roll W > the feeding speed Vf of the feed roll F", since the rotational speed (winding speed) of the roll W on the downstream side is higher than the rotational speed (sheet feeding speed) of the roll F on the upstream side, the sheet 11L is wound around the toilet roll 10L while receiving tension between the two rolls, and the winding density increases. Therefore, in the winding process of the toilet roll 10L, by controlling the tension by adjusting the continuous sheet feeding speed from the feed roll F so that the speed difference between the winding speed Vw and the feeding speed Vf is relatively larger in the winding end (outer winding region OR) than in the winding start (inner winding region IR) of the sheet 11L, the winding density can be made higher in the outer winding region OR than in the inner winding region IR.

[0120] The speed adjustment control for making the outer winding density ODE higher than the inner winding density IDE may be performed stepwise or may also be performed continuously. According to the stepwise speed adjustment control, the control can be simplified. According to the continuous speed adjustment control, since it becomes possible to gradually increase the winding density of the toilet roll 10, it is possible to reduce not only the difference in texture between the start and the end of use of the toilet roll, but also the change in texture of the toilet paper from the start to the end of use of the toilet roll.

[0121] (Second Embodiment) Next, a second embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above-described embodiment are applicable to the present embodiment.

[0122] The toilet roll according to the second embodiment is a variation of the first embodiment.

[0123] Referring to FIG. 2(b), in this specification, a line at a position where the length from the end portion 13e on the roll center side of the toilet roll 10 is 90% of the winding length L of the toilet roll 10 is also referred to as the "90% line". Similarly, a line at a position where the length from the end portion 13e on the roll center side of the toilet roll 10 is 10% of the winding length L of the toilet roll 10 is referred to as the "10% line".

[0124] In this specification, the outer winding density ODE calculated as the winding density DEn (n = 90) of the roll-shaped portion around which the toilet paper 13 is wound from the end portion 13e on the roll center side of the toilet roll 10 to a length of 90% of the winding length L (0.90L), that is, up to the 90% line, is referred to as the "outer winding density ODE 90 ". Also, in this specification, the inner winding density IDE calculated as the winding density DEn (n = 10) of the roll-shaped portion around which the toilet paper 13 is wound from the end portion 13e on the roll center side of the toilet roll 10 to a length of 10% of the winding length L (0.10L), that is, up to the 10% line, is referred to as the "inner winding density IDE 10 ".

[0125] The toilet roll 10 according to the second embodiment has the same configuration as that of the first embodiment, and further, the outer winding density ODE 90 is greater than 1.00 times and less than or equal to 1.50 times, preferably greater than or equal to 1.05 times and less than or equal to 1.45 times, more preferably greater than or equal to 1.10 times and less than or equal to 1.40 times that of the inner winding density IDE 10 .

[0126] The outer winding density ODE 90 can be calculated using the formulas (I') and (II') described in the first embodiment. At this time, as the winding length OL, a length 0.90L which is 90% of the winding length L is used. Also, unwind the toilet paper 13 from the toilet roll 10 with the winding length L, and the outer winding region OR 90 which is the region including the 90% line in the outer winding region OR of the toilet paper 13 is made to appear on the surface (outer peripheral surface) of the toilet roll 10, and the value of the winding diameter measured for the toilet roll 10 in the state where the portion of the unwound toilet paper 13 is cut off and removed at the 90% line (refer to the roll-shaped portion shown in (d) of FIG. 2) is used as the winding diameter ODR. The outer winding density ODE 90 calculated in this way will hereinafter also be referred to as "the outer winding density ODE 90 calculated with respect to the outer winding region OR 90 ".

[0127] Similarly, the inner winding density IDE 10 can be calculated using the formulas (I'') and (II'') described in the first embodiment. At this time, as the winding length IL, a length 0.10L which is 10% of the winding length is used. Also, unwind the toilet paper 13 from the toilet roll 10 with the winding length L, and the inner winding region IR 10It is made to appear on the surface (outer circumferential surface) of the toilet roll 10, and the measured value of the winding diameter of the toilet roll 10 in a state where the portion of the unwound toilet paper 13 is cut off at the 10% line (refer to the roll-shaped portion shown in Fig. 2(e)) is used as the winding diameter IDR. The inner winding density IDE calculated in this way 10 shall hereinafter also be referred to as "the inner winding density IDE calculated for the inner winding region IR 10 ". 10

[0128] [Function and effect] The toilet roll 10 according to the second embodiment can further exhibit the following function and effect in addition to the same function and effect as the toilet roll 10 according to the first embodiment.

[0129] That is, in this embodiment, the outer winding density ODE calculated for the outer winding region OR 90 is greater than 1.00 times and less than or equal to 1.50 times, preferably greater than or equal to 1.05 times and less than or equal to 1.45 times, and more preferably greater than or equal to 1.10 times and less than or equal to 1.40 times the inner winding density IDE calculated for the inner winding region IR 90 . 10 10 On the other hand, when the outer winding density ODE calculated for the outer winding region OR

[0130] is less than or equal to 1.00 times the inner winding density IDE calculated for the inner winding region IR 90 , 90 the inner winding density IDE 10 is equal to or greater than the outer winding density ODE 10 . In this case, the effect of reducing the pressure (inner pressure) received by the inner winding region IR cannot be obtained, and the difference in texture of the toilet paper 13 between the outer winding region OR and the inner winding region IR becomes large. 10 90

[0131] Also, when the outer winding density ODE calculated for the outer winding region OR 90 is greater than 1.50 times the inner winding density IDE calculated for the inner winding region IR 90 , 10 the difference in texture of the toilet paper 13 between the outer winding region OR and the inner winding region IR becomes large, and the outer winding region OR may be damaged due to excessive pressure. 10 ​​​​If it exceeds 1.50 times, a high pressure (internal pressure) is applied to the outer winding region OR. Therefore, the toilet paper 13 in the outer winding region OR is compressed, and when the paper thickness is reduced (the toilet paper 13 is densified) or an emboss is applied, the emboss is crushed, making it difficult to obtain a fluffy feeling. Also, since a high pressure is applied to the outer winding region OR, the inner winding region IR that is relatively loosely wound is more likely to be deformed under its influence.

[0132] As in this embodiment, for the outer winding region OR 90 the outer winding density ODE calculated 90 with respect to the inner winding region IR 10 the inner winding density IDE calculated 10 If it is greater than 1.00 times and less than or equal to 1.50 times that of, the effect of reducing the pressure (internal pressure) in the inner winding region IR and the effect of preventing excessive pressure increase in the outer winding region OR can both be achieved. Therefore, the difference in texture of the toilet paper 13 between the outer winding region OR and the inner winding region IR is small, and it is difficult for a difference in texture to occur from the start to the end of using the toilet roll.

[0133] (Third Embodiment) Next, a third embodiment of the present invention will be described. Unless otherwise specified, configurations applicable to the first and second embodiments are applicable to this embodiment.

[0134] The toilet roll according to the third embodiment is a variation of the first embodiment or the second embodiment. The toilet roll according to the third embodiment has the same configuration as the first embodiment or the second embodiment, and further, the outer winding density ODE is 1.15 m / cm 2 or more and 1.55 m / cm 2 or less, and the inner winding density IDE is 0.80 m / cm 2 or more and 1.20 m / cm 2 or less.

[0135] The outer winding density ODE in the third embodiment is the winding density of the toilet roll calculated with respect to the outer winding region OR of the toilet paper 13, which is the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 85% or more and 95% or less of the winding length L of the toilet roll 10, and corresponds to the winding density DEn (85 ≤ n ≤ 95) when the winding length is set to a length from 0.85L to 0.95L.

[0136] Also, the inner winding density IDE in the third embodiment is the winding density of the toilet roll calculated with respect to the inner winding region IR of the toilet roll, which is the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 5% or more and 15% or less of the winding length L of the toilet roll 10, and corresponds to the winding density DEn (5 ≤ n ≤ 15) when the winding length is set to a length from 0.05L to 0.15L.

[0137] The outer winding density ODE and the inner winding density IDE can be calculated by calculation by applying mutatis mutandis the formulas (I), (II), etc. described in the above embodiments. For example, when it is desired to obtain the outer winding density ODE or the inner winding density IDE with respect to the outer winding region ORn (85 ≤ n ≤ 95) or the inner winding region IRn (5 ≤ n ≤ 15) including the n% line located at the position where the length from the end 13e on the roll center side of the toilet roll 10 is n% of the winding length L of the toilet roll 10, in formulas (I) and (II), the length (n / 100)L (85 ≤ n ≤ 95 or 5 ≤ n ≤ 15) is used as the winding length, and as the winding diameter, the winding diameter of the toilet roll in a state where the toilet paper is unwound and cut off up to the n% line is actually measured and substituted into the formula, whereby it can be obtained.

[0138] The outer winding density ODE, which is the winding density when the winding length OL is in the range of 0.85L to 0.95L (in the case of 85 ≤ n ≤ 95), is preferably 1.15 m / cm 2 or more and 1.55 m / cm 2 or less, and more preferably 1.20 m / cm 21.50 m / cm or more 2 and preferably 1.25 m / cm or less 2 1.45 m / cm or more 2 and 1.45 m / cm or less

[0139] When the roll length IL is in the range of 0.05L to 0.15L (when 5 ≤ n ≤ 15), the inner roll density IDE, which is the roll density, is lower than the outer roll density ODE, and preferably 0.80 m / cm 2 1.20 m / cm or more 2 and preferably 0.85 m / cm or less 2 1.15 m / cm or more 2 and more preferably 0.90 m / cm or less 2 1.10 m / cm or more 2 and 1.10 m / cm or less

[0140] [Advantages and Effects] In addition to the same effects as those described in the first or second embodiment, the toilet roll 10 according to the third embodiment can exhibit the following effects

[0141] In the toilet roll 10 according to the present embodiment, the outer roll density ODE calculated for the outer roll region OR that is relatively located on the outer peripheral side of the roll in the radial direction of the toilet roll 10 is higher than the inner roll density IDE calculated for the inner roll region IR that is relatively located on the roll center side in the radial direction of the toilet roll 10. The inner roll density IDE in the inner roll region IR is lower than the outer roll density ODE in the outer roll region OR

[0142] In such a configuration, when the outer roll density ODE is less than 1.15 m / cm 2 the inner roll density IDE will also be less than 1.15 m / cm 2 In this case, the toilet paper 13 will be wound in a relatively loose roll shape. Therefore, the roll diameter DR may increase, and the toilet roll 10 may not fit in a general toilet holder

[0143] Also, when the outer winding density ODE exceeds 1.55 m / cm 2 the toilet paper 13 will be wound in a relatively tight roll, and the influence of the pressure applied in the paper thickness direction will increase. Therefore, due to compression, the toilet paper 13 may be crushed and hardened, or if an emboss is applied to the toilet paper 13, the emboss may be crushed, resulting in inferior texture of the toilet paper 13 and poor aesthetics of the appearance of the toilet roll 10.

[0144] Also, when the inner winding density IDE is less than 0.80 m / cm 2 the winding of the toilet paper 13 will become loose on the roll center side where the inner winding area IR is located. Therefore, there is a risk that the portion of the toilet paper 13 included in the inner winding area IR will be displaced in the axial direction of the toilet roll 10 (the length direction of the paper tube 14) and protrude beyond the roll width H.

[0145] Also, when the inner winding density IDE exceeds 1.20 m / cm 2 the outer winding density ODE will also exceed 1.20 m / cm 2 In this case, the influence of the pressure applied in the paper thickness direction of the toilet paper 13 inside the toilet roll 10 increases. As a result, the toilet paper 13 may be crushed and hardened, or if an emboss is applied to the toilet paper 13, the emboss may be crushed, resulting in inferior texture of the toilet paper 13 and poor aesthetics of the appearance of the toilet roll 10.

[0146] In this embodiment, the outer winding density ODE is 1.15 m / cm 2 or more and 1.55 m / cm 2 or less, and the inner winding density IDE is 0.80 m / cm 2 or more and 1.20 m / cm 2 or less, so that the winding density is adjusted. According to the configuration of this embodiment, although the winding density varies depending on the position inside the toilet roll 10, the balance of the winding density is good, and it is possible to provide a toilet roll in which the occurrence of the above-mentioned concerns is prevented.

[0147] (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the first to third embodiments are applicable to this embodiment.

[0148] The fourth embodiment is a variation of the first to third embodiments. The fourth embodiment has the following configurations (1) to (4) in addition to the same configurations as any of the first to third embodiments. (1) The toilet paper 13 is embossed. (2) The outer winding region emboss depth measured with respect to the outer winding region OR is smaller than the inner winding region emboss depth measured with respect to the inner winding region IR. (3) The depth of the outer winding emboss is 80 μm or more and 115 μm or less. (4) The depth of the inner winding emboss is 85 μm or more and 145 μm or less.

[0149] [Emboss] (a) of FIG. 4 is a schematic diagram corresponding to a part of the developed view of the toilet roll 10 shown in (b) of FIG. 2, and schematically shows the vicinity of the outer winding region OR and the inner winding region IR of the toilet paper 13 unrolled from the toilet roll 10 in one drawing.

[0150] Referring to FIGS. 4(a) and 4(b), the toilet paper 13 (sheet 11) according to this embodiment is provided with an emboss having a configuration in which one surface of both surfaces has an emboss convex portion and the other surface has an emboss concave portion formed on the back side of the emboss convex portion. The emboss can be provided mainly for the purpose of improving qualities such as touch feeling (softness), flexibility, bulkiness, water absorbency, and decorative property. For the purpose of improving particularly the touch feeling and the decorative property, the toilet paper 13 is preferably wound around the toilet roll 10 such that the emboss concave portion is located on the outer peripheral side surface of the toilet roll 10 and the emboss convex portion is located on the inner peripheral side surface of the toilet roll 10. Further, as an emboss pattern therefor, a dot pattern, a line pattern, or any emboss pattern combining these formed substantially over the entire area of the paper surface with respect to the sheet 11 is applicable.

[0151] [Emboss depth] In the fourth embodiment, the outer winding region emboss depth measured with respect to the outer winding region OR is configured to be smaller than the inner winding region emboss depth measured with respect to the inner winding region IR.

[0152] As described above with reference to FIGS. 2(a) and 2(b), the "outer winding region OR" is a region of the toilet paper 13 in a state where the toilet paper 13 is unwound from the toilet roll 10 having a roll length L, and the length from the end portion 13e on the roll center side of the toilet roll 10 is in the range of 85% or more and 95% or less of the roll length L of the toilet roll 10.

[0153] The "outer winding region emboss depth D1 measured with respect to the outer winding region OR" is the depth D of the emboss concave portion included in the outer winding region OR, measured along the "90% line" (see FIG. 4(a)), which is a line drawn so as to bisect the outer winding region OR in the length direction of the toilet paper 13 (see FIG. 4(b)). For example, when the roll length L of the toilet roll 10 is 120 m, the 90% line is at a position where the length from the end portion 13e on the roll center side of the toilet roll 10 is 108 m.

[0154] Similarly, as described above with reference to FIGS. 2(a) and 2(b), the "inner winding region IR" is a region of the toilet paper 13 where, in the state where the toilet paper 13 is unwound from the toilet roll 10 with a roll length L, the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 5% or more and 15% or less of the roll length L of the toilet roll 10.

[0155] The "inner winding region emboss depth D2 measured with respect to the inner winding region IR" is the depth D of the emboss recess included in the inner winding region IR, measured along the "10% line" (see FIG. 4(a)), which is a line drawn so as to bisect the inner winding region IR in the length direction of the toilet paper 13 (see FIG. 4(b)). For example, when the roll length L of the toilet roll 10 is 120 m, the 10% line is at a position where the length from the end 13e on the roll center side of the toilet roll 10 is 12 m.

[0156] [Method for Measuring Emboss Depth] Referring to FIG. 4, the emboss depth D (D1, D2) is obtained by measuring the height difference of the emboss using a shape measurement laser microscope. The shape measurement laser microscope scans a laser light source, which is a point light source, through an objective lens to a plurality of pixels that divide the X-Y plane within the observation field of view, and detects the reflected light for each pixel with a light receiving element. Then, the objective lens is driven in the height (Z-axis) direction, and the height information and the reflected light amount are detected with the Z-axis position having the highest reflected light amount as the focus. By repeating the scan in this way, a light amount super-depth image and a height image (information) that are in focus as a whole are obtained. Since the laser light source is a pinhole confocal optical system, the measurement accuracy is high.

[0157] As a shape measurement laser microscope, a one-shot 3D microscope (VR-3200) (manufactured by KEYENCE Corporation) can be used. Also, as the image observation, measurement, and image analysis software for the laser microscope, the product name "VR-H1A" can be used. The measurement conditions are to measure under the conditions of a magnification of 12 times and a field area of 24 mm × 18 mm. Note that the measurement magnification and the field area may be appropriately changed depending on the size of the emboss to be obtained.

[0158] Perform the analysis of the emboss depth according to the following procedure. (1) Remove the undulation of the entire field of view by surface shape correction for the target image. (2) Measure the roughness profile between two points sandwiching one emboss to be measured by measuring the line thickness, and perform tilt correction. (3) Obtain the emboss depths Z1 and Z2 of the start point X1 and the end point X2 of the emboss from the data of the position X (μm) in the plane direction of the emboss and the emboss depth Z (μm) (see (c) of FIG. 4). (4) Take the average value of the emboss depths Z1 and Z2 as the maximum value Zmax of the emboss depth, and take the difference between the minimum value Zmin of the emboss depth located between the start point X1 and the end point X2 of the emboss as the emboss depth ΔZ (see (c) of FIG. 4). ΔZ = Zmax ― Zmin (5) Perform the measurements in (1) to (4) above for any 10 embosses of the toilet paper 13, and take the average value of ΔZ as the emboss depth D.

[0159] Specifically, for the "outer wrap region emboss depth D1 measured with respect to the outer wrap region OR", any 10 embosses are selected from the embosses on the "90% line" (see (a) of FIG. 4). When the number of embosses on the 90% line is less than 10, select the embosses with a close distance from the 90% line.

[0160] Regarding the "inner winding region emboss depth D2 measured with respect to the inner winding region IR", any 10 embosses are selected from the embosses on the "10% line" (see (a) of FIG. 4). When the number of embosses on the 10% line is less than 10, embosses with a closer distance from the vicinity of the 10% line are selected.

[0161] [Function and effect] The toilet roll of this embodiment is an embossed product, and is configured such that the outer winding region emboss depth D1 measured with respect to the outer winding region OR is smaller than the inner winding region emboss depth D2 measured with respect to the inner winding region IR. That is, in the inner winding region IR, the emboss depth is larger than that in the outer winding region OR, and a fluffy feeling due to the embosses is easily obtained. Therefore, it can have the effect of offsetting the influence of compression by internal pressure, etc., and can suppress the difference in texture between the inner winding region and the outer winding region.

[0162] Also, in this embodiment, the outer winding region emboss depth D1 (measured along the 90% line) is 80 μm or more and 115 μm or less, preferably 85 μm or more and 110 μm or less, more preferably 90 μm or more and 105 μm or less. In addition, the inner winding region emboss depth D2 (measured along the 10% line) is 85 μm or more and 145 μm or less, preferably 90 μm or more and 140 μm or less, more preferably 95 μm or more and 135 μm or less. By setting the emboss depth within such a range, it is possible to achieve the desired effects of embossing, such as improving the quality of touch feeling (softness), flexibility, bulkiness, water absorbency, and cosmetic properties, and to prevent the winding diameter from exceeding a predetermined dimension due to the emboss depth becoming too deep.

[0163] [Means for achieving the invention] The control for varying the emboss depth according to the region in the length direction of the toilet paper within one toilet roll can be performed by changing the processing conditions during the embossing process. Referring to the embossing section 21 of the manufacturing apparatus shown in Fig. 3, the embossing is performed by passing the sheet 11L between an embossing roll having a convex structure constituting an embossing pattern and a backup roll having a hard rubber-like elastic body on its surface, and pressing the embossing pattern onto the sheet 11L. When pressing the embossing pattern, an embossing shape having an embossing depth within the above range can be formed by changing the pressing amount and / or the pressing pressure. By increasing the pressing amount and / or the pressing pressure, the embossing depth can be increased.

[0164] (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. Unless otherwise specified, configurations applicable to the above-described embodiments are applicable to this embodiment.

[0165] The toilet roll 10 according to the first embodiment shown in Fig. 1 is a single-ply toilet roll around which a single-ply toilet paper 13 composed of a single sheet 11 is wound, whereas the toilet roll 10 according to the fifth embodiment is a multi-ply toilet roll around which a multi-ply toilet paper 13 composed of two or more sheets 11 is wound.

[0166] The toilet roll according to the fifth embodiment has the following configurations (1) to (3). (1) The toilet roll is a toilet roll around which a toilet paper of p plies (p is an integer of 2 or more) is wound in a roll shape. (2) The number of plies p and the winding length L (m) satisfy the relationship of the formula L ≧ 90 / p. (3) With respect to the outer winding region of the toilet roll corresponding to the region of the toilet paper where the length from the end on the roll center side of the toilet roll is in the range of 85% or more and 95% or less of the winding length L, the outer winding density ODE of the toilet roll calculated for this region is higher than the inner winding density IDE of the toilet roll calculated for the inner winding region of the toilet roll corresponding to the region of the toilet paper where the length from the end on the roll center side of the toilet roll is in the range of 5% or more and 15% or less of the winding length L.

[0167] Regarding configuration (1), in the present embodiment, the ply number p, which is the number of sheets 11 constituting the toilet paper 13, is 2 or more, preferably 2 or more and 4 or less, and more preferably 2.

[0168] Regarding configuration (2), the ply number p and the winding length L (m) satisfy the relationship L≧90 / p. The winding length L is preferably 45 m or more, more preferably 45 m or more and 90 m or less, still more preferably 50 m or more and 75 m or less. When an emboss is applied to the toilet paper 13, it is preferably 60 m or more and 70 m or less, and when no emboss is applied, it is preferably 65 m or more and 75 m or less.

[0169] In the present embodiment with multiple plies, if the winding length L of the toilet roll 10 is less than 45 m, when the winding length per roll is short and its roll diameter DR is within a predetermined dimension range, the desired effect of space saving during carrying and storage of the toilet roll 10 cannot be obtained. Also, when using the toilet roll 10, frequent replenishment of the toilet roll 10 is required because it will be used up quickly.

[0170] If the roll length L of the toilet roll 10 is too long, generally, the roll diameter DR of the toilet roll 10 will become large, and it will be difficult for the toilet roll 10 to fit in a general toilet roll holder. At this time, if we try to keep the roll diameter DR of the toilet roll 10 within a predetermined dimension, the pressure applied to the toilet paper 13 inside the toilet roll 10 will increase due to tight winding, and the texture, usability, and cosmetic appearance of the toilet roll will tend to deteriorate.

[0171] Regarding Configuration (3), the "outer winding density ODE" and "inner winding density IDE" of the toilet roll in the present embodiment can be obtained by calculation in the same manner and calculation formula as described with reference to FIG. 2 in the first embodiment. That is, the following formula can be used for calculation.

[0172] (Outer winding density ODE (m / cm 2 )) = (Roll length OL (m) × Ply number p) ÷ (Roll cross-sectional area OA (cm 2 )) ··· (I’) (Roll cross-sectional area OA (cm 2 )) = {((Outer roll diameter ODR (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14)} ··· (II’) (Inner winding density IDE (m / cm 2 )) = (Roll length IL (m) × Ply number p) ÷ (Roll cross-sectional area IA (cm 2 )) ··· (I’’) (Roll cross-sectional area IA (cm 2 )) = {((Inner roll diameter IDR (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14)} ··· (II’’)

[0173] In the formula, the ply number p satisfies p ≥ 2 (p is an integer), the roll length OL is a length of 0.85L to 0.95L, and the roll length IL is a length of 0.05L to 0.15L. The outer roll diameter ODR, inner roll diameter IDR, and core diameter DC can be measured.

[0174] In addition, in Fig. 2(b), there is a description of "L≥90", which defines the winding length for the embodiment where the ply number p is p = 1. In the fifth embodiment where the ply number p is p≥2 (p is an integer), the winding length is defined by "L≥90 / p".

[0175] [Winding diameter DR of the toilet roll 10] In the embodiment of multiple plies, the winding diameter DR of the toilet roll 10 is preferably 100 mm or more and 140 mm or less, more preferably 110 mm or more and 135 mm or less, and even more preferably greater than 110 mm and 130 mm or less.

[0176] The winding diameter DR of the toilet roll 10 is set to a size that can fit within a general toilet roll holder and be rotatably supported therein. If the winding diameter DR of the toilet roll 10 is less than 100 mm, the winding length of the toilet roll 10 can be limited. Also, if an attempt is made to ensure a long winding length of the toilet roll 10 with a winding diameter of less than 100 mm, the paper thickness, basis weight, etc. of the toilet paper 13 used for the toilet roll 10 are restricted, making it difficult to ensure strength. Alternatively, pressure is applied to the toilet paper 13 due to tight winding, deteriorating its texture and usability. Also, if an emboss is applied, the emboss may be crushed, deteriorating the cosmetic appearance of the toilet roll 10.

[0177] [Core diameter of the paper tube] The core diameter DC, which is the outer diameter of the paper tube 14, is the same as in the case of the single-ply embodiment and is set according to the size of the members (such as the core and hook) of the toilet roll holder for rotatably supporting the toilet roll 10, and is preferably 37 mm or more and 42 mm or less, more preferably 38 mm or more and 41 mm or less.

[0178] [Basis weight] In the case of multiple plies of the present embodiment, the basis weight of the toilet paper 13 is calculated as the basis weight per sheet of the plurality of sheets 11 constituting the multiple-ply toilet paper 13. The basis weight of the toilet paper 13 can be obtained by measuring in accordance with the provisions of Japanese Industrial Standard JIS P8124.

[0179] In the case of multiple plies of the present embodiment, the basis weight of the toilet paper 13 is preferably 10.0 g / m per sheet 2 or more and 18.0 g / m 2 or less, more preferably 11.0 g / m 2 or more and 17.0 g / m 2 or less.

[0180] When the basis weight is lower than 10.0 g / m per sheet, generally, the usability deteriorates due to a decrease in the amount of absorbed water caused by a decrease in the amount of pulp contained, etc., and the strength of the toilet paper 13 also decreases, making it likely that unintended breakage will occur. 2 When the basis weight is lower than 10.0 g / m per sheet, generally, the usability deteriorates due to a decrease in the amount of absorbed water caused by a decrease in the amount of pulp contained, etc., and the strength of the toilet paper 13 also decreases, making it likely that unintended breakage will occur.

[0181] When the basis weight is higher than 18.0 g / m per sheet, generally, the paper thickness of the toilet paper 13 increases, and it may become difficult to maintain the roll diameter DR of the toilet roll 10 at a predetermined dimension. 2 When the basis weight is higher than 18.0 g / m per sheet, generally, the paper thickness of the toilet paper 13 increases, and it may become difficult to maintain the roll diameter DR of the toilet roll 10 at a predetermined dimension.

[0182] When the basis weight of the toilet paper 13 is within the range of 10.0 g / m 2 or more and 18.0 g / m 2 or less per sheet, it becomes easy to maintain the roll diameter DR of the toilet roll 10 at a predetermined dimension while ensuring the strength, water absorption, and usability of the toilet paper 13.

[0183] [Advantages and effects] The toilet roll 10 according to the fifth embodiment is a multi-ply product, while the toilet roll 10 according to the first embodiment is a single-ply product. The toilet roll 10 according to the fifth embodiment can exhibit the following advantages and effects.

[0184] In the toilet roll 10 according to the present embodiment, the outer winding density ODE calculated for the outer winding region OR that is relatively located on the outer peripheral side of the roll in the radial direction of the toilet roll 10 is higher than the inner winding density IDE calculated for the inner winding region IR that is relatively located on the roll center side in the radial direction of the toilet roll 10. Thus, the winding density of the toilet roll is adjusted according to the position in the radial direction of the toilet roll.

[0185] That is, in the present embodiment, the inner winding density IDE is made relatively smaller than the outer winding density ODE. Thereby, even if the winding length of the toilet roll 10 of two or more plies is increased, the pressure applied to the toilet paper 13 in the inner winding region IR can be reduced. As a result, it is possible to suppress a reduction in paper thickness (increase in density of toilet paper) due to compression caused by internal pressure and crushing of the emboss when an emboss is applied.

[0186] Therefore, according to the present invention, it is possible to suppress a difference in texture of the toilet paper at the start and end of use of the toilet roll 10.

[0187] Further, in the present embodiment, in a region different from the outer winding region OR and the inner winding region IR, such as an intermediate region located between the outer winding region OR and the inner winding region IR (for example, a region of the toilet paper 13 in a range where the length from the end 13e on the roll center side of the toilet roll 10 is greater than 15% and less than 85% of the winding length L of the toilet roll 10, see FIG. 2), the winding density may be adjusted. For example, the winding density may be gradually decreased as going from the inner winding region IR to the outer winding region OR in the intermediate region. According to this, the effect of suppressing the difference in texture in the longitudinal direction of the toilet paper is increased, and the change in texture of the toilet paper from the start to the end of use of the toilet roll can be reduced.

[0188] (Sixth Embodiment) The toilet roll according to the sixth embodiment is a variation of the fifth embodiment. Unless otherwise specified, the configurations applicable to the fifth embodiment are applicable to this embodiment.

[0189] The toilet roll 10 according to the sixth embodiment has the same configuration as that of the fifth embodiment, and further, "the outer winding density ODE calculated as the winding density of the roll-shaped portion where the toilet paper is wound from the end on the roll center side of the toilet roll to a length of 90% of the winding length L 90 " is greater than 1.00 times and less than or equal to 1.50 times, preferably greater than or equal to 1.05 times and less than or equal to 1.45 times, and more preferably greater than or equal to 1.10 times and less than or equal to 1.40 times of "the inner winding density IDE calculated as the winding density of the roll-shaped portion where the toilet paper is wound from the end on the roll center side of the toilet roll to a length of 10% of the winding length L 10 ".

[0190] The outer winding density ODE 90 can be calculated using the formulas (I') and (II') described in the fifth embodiment. At this time, as the winding length OL, a length of 0.90L, which is 90% of the winding length L, is used. Also, unwind the toilet paper 13 from the toilet roll 10 with the winding length L, and make the outer winding region OR, which is the region including the 90% line in the outer winding region OR of the toilet paper 13, appear on the surface (outer peripheral surface) of the toilet roll 10. The value of the winding diameter measured for the toilet roll 10 in the state where the portion of the unwound toilet paper 13 is cut and removed at the 90% line (refer to the roll-shaped portion shown in (d) of FIG. 2) is used as the winding diameter ODR. The outer winding density ODE calculated in this way 90 is also referred to as "the outer winding density ODE calculated for the outer winding region OR 90 ". 90 Regarding the outer winding region OR 90 ".

[0191] Similarly, the inner winding density IDE 10can be calculated using the formulas (I'') and (II'') described in the first embodiment. At this time, as the winding length IL, a length of 0.10L, which is 10% of the winding length, is used. Also, unwind the toilet paper 13 from the toilet roll 10 with the winding length L, and the inner winding region IR which is the region including the 10% line in the inner winding region IR of the toilet paper 13 10 is made to appear on the surface (outer peripheral surface) of the toilet roll 10, and the measured value of the winding diameter of the toilet roll 10 in the state where the portion of the unwound toilet paper 13 is cut off and removed at the 10% line (refer to the roll-shaped portion shown in (e) of FIG. 2) is used as the winding diameter IDR. The inner winding density IDE calculated in this way 10 is also referred to as "the inner winding density IDE calculated with respect to the inner winding region IR 10 ". 10

[0192] [Advantages and effects] The toilet roll 10 according to the sixth embodiment can exhibit the following additional advantages and effects in addition to the same advantages and effects as the toilet roll 10 according to the fifth embodiment.

[0193] That is, in this embodiment, the outer winding density ODE 90 calculated with respect to the outer winding region OR 90 is greater than 1.00 times and less than or equal to 1.50 times, preferably greater than or equal to 1.05 times and less than or equal to 1.45 times, and more preferably greater than or equal to 1.10 times and less than or equal to 1.40 times the inner winding density IDE 10 calculated with respect to the inner winding region IR 10 .

[0194] On the other hand, when the outer winding density ODE 90 calculated with respect to the outer winding region OR 90 is less than or equal to 1.00 times the inner winding density IDE 10 calculated with respect to the inner winding region IR 10 , the inner winding density IDE 10 is the outer winding density ODE 90 ​is equal to or greater than that. In this case, the effect of reducing the pressure (internal pressure) received by the inner winding region IR cannot be obtained, and the difference in the texture of the toilet paper 13 between the outer winding region OR and the inner winding region IR becomes large.

[0195] Also, for the outer winding region OR 90 the outer winding density ODE calculated 90 with respect to the inner winding region IR 10 the inner winding density IDE calculated 10 If it exceeds 1.50 times that of, a high pressure (internal pressure) is applied to the outer winding region OR. Therefore, the toilet paper 13 in the outer winding region OR is compressed, and when there is a reduction in paper thickness (increase in the density of the toilet paper 13) or embossing is applied, the embossing is crushed, making it difficult to obtain a fluffy feeling. Also, since a high pressure is applied to the outer winding region OR, the relatively loosely wound inner winding region IR is more likely to be deformed under its influence.

[0196] As in this embodiment, when the outer winding density ODE 90 calculated with respect to the outer winding region OR 90 is greater than 1.00 times and less than or equal to 1.50 times that of the inner winding density IDE 10 calculated with respect to the inner winding region IR 10 both the effect of reducing the pressure (internal pressure) in the inner winding region IR and the effect of preventing excessive pressure increase in the outer winding region OR can be achieved. Therefore, the difference in the texture of the toilet paper 13 between the outer winding region OR and the inner winding region IR is small, and it is less likely that a difference in texture occurs from the start to the end of using the toilet roll.

[0197] (Seventh Embodiment) The toilet roll according to the seventh embodiment is a variation of the fifth embodiment or the sixth embodiment. Unless otherwise specified, the configurations applicable to the fifth embodiment or the sixth embodiment are applicable to this embodiment.

[0198] The toilet roll according to the seventh embodiment has the same configuration as the fifth embodiment or the sixth embodiment, and further, the outer winding density ODE is 1.10 m / cm 21.75 m / cm or more 2 is less than or equal to, and the inner winding density IDE is 0.90 m / cm 2 1.40 m / cm or more 2 is less than or equal to.

[0199] The outer winding density ODE in the seventh embodiment is, in the same manner as defined in the above-described embodiments, the winding density of the toilet roll calculated with respect to the outer winding region OR of the toilet roll, which is the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 85% or more and 95% or less of the winding length L of the toilet roll 10, and corresponds to the winding density DEn (85 ≤ n ≤ 95) when the winding length is set to a length from 0.85L to 0.95L.

[0200] Also, the inner winding density IDE in the seventh embodiment is, in the same manner as defined in the above-described embodiments, the winding density of the toilet roll calculated with respect to the inner winding region IR of the toilet roll, which is the region of the toilet paper 13 where the length from the end 13e on the roll center side of the toilet roll 10 is in the range of 5% or more and 15% or less of the winding length L of the toilet roll 10, and corresponds to the winding density DEn (5 ≤ n ≤ 15) when the winding length is set to a length from 0.05L to 0.15L.

[0201] The outer winding density ODE and the inner winding density IDE can be calculated by calculation by applying mutatis mutandis the formulas (I), (II), etc. described in the above-described embodiments.

[0202] Specifically, the winding density of the toilet roll 10 is calculated by the following formula (I).

[0203] (Winding density DE (m / cm 2 )) = (Winding length L (m) × Ply number p) ÷ (Roll cross-sectional area A (cm 2 )) ··· (I) (Roll cross-sectional area A (cm 2 )) = { (Roll diameter DR (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14} ··· (II) For example, when it is desired to obtain the outer winding density ODE or the inner winding density IDE with respect to the outer winding region ORn (85 ≤ n ≤ 95) or the inner winding region IRn (5 ≤ n ≤ 15) including the n% line at a position where the length from the end 13e on the roll center side of the toilet roll 10 is n% of the winding length L of the toilet roll 10, in formulas (I) and (II), the winding length is set to the length (n / 100)L, (85 ≤ n ≤ 95 or 5 ≤ n ≤ 15), and as the winding diameter, the winding diameter of the toilet roll in a state where the toilet paper is unwound and cut off up to the n% line is actually measured and substituted into the formula, whereby it can be obtained.

[0204] The outer winding density ODE, which is the winding density when the winding length OL is a length from 0.85L to 0.95L (in the case of 85 ≤ n ≤ 95), is from 1.10 m / cm 2 to 1.75 m / cm 2 or less. Also, when the toilet paper 13 has an emboss, the outer winding density ODE is preferably from 1.15 m / cm 2 to 1.60 m / cm 2 or less, and more preferably from 1.20 m / cm 2 to 1.50 m / cm 2 or less. And when the toilet paper 13 has no emboss, it is preferably from 1.30 m / cm 2 to 1.70 m / cm 2 or less, and more preferably from 1.40 m / cm 2 to 1.65 m / cm 2 or less.

[0205] The inner winding density IDE, which is the winding density when the winding length IL is a length from 0.05L to 0.15L (in the case of 5 ≤ n ≤ 15), is a value lower than the outer winding density ODE and is from 0.90 m / cm 2 to 1.40 m / cm 2 or less. Also, when the toilet paper 13 has an emboss, the inner winding density IDE is preferably from 0.95 m / cm 2 to 1.30 m / cm 2 or less, and more preferably from 1.00 m / cm 2 to 1.20 m / cm2 is as follows, and when the toilet paper 13 is not embossed, preferably, 1.00 m / cm 2 or more and 1.35 m / cm 2 or less, more preferably, 1.10 m / cm 2 or more and 1.30 m / cm 2 or less.

[0206] [Advantages and effects] The toilet roll 10 according to the seventh embodiment can exhibit the following advantages and effects in addition to the same advantages and effects as those described in the fifth or sixth embodiment.

[0207] In the toilet roll 10 according to the present embodiment, the outer winding density ODE calculated for the outer winding region OR that is relatively located on the outer peripheral side of the roll in the radial direction of the toilet roll 10 is higher than the inner winding density IDE calculated for the inner winding region IR that is relatively located on the roll center side in the radial direction of the toilet roll 10. The inner winding density IDE in the inner winding region IR on the inner side is lower than the outer winding density ODE in the outer winding region OR on the outer side.

[0208] In such a configuration, when the outer winding density ODE is less than 1.10 m / cm 2 the inner winding density IDE will also be less than 1.10 m / cm 2 In this case, the toilet paper 13 will be wound in a roll state relatively loosely. Therefore, the winding diameter DR may become large and the toilet roll 10 may not fit in a general toilet holder.

[0209] Also, when the outer winding density ODE is 1.75 m / cm 2When it exceeds, the toilet paper 13 will be wound in a roll relatively tightly, and the influence of the pressure applied in the paper thickness direction will increase. Therefore, due to compression, the toilet paper 13 may be crushed and hardened, or if an emboss is applied to the toilet paper 13, the emboss may be crushed, resulting in inferior texture of the toilet paper 13 and the appearance beauty of the toilet roll 10.

[0210] Also, when the inner winding density IDE is less than 0.90 m / cm 2 When it is less, the winding of the toilet paper 13 becomes loose on the roll center side where the inner winding region IR is located. Therefore, there is a risk that the portion of the toilet paper 13 included in the inner winding region IR may be displaced in the axial direction of the toilet roll 10 (the length direction of the paper tube 14) and protrude beyond the roll width H.

[0211] Also, when the inner winding density IDE exceeds 1.40 m / cm 2 When it exceeds, the outer winding density ODE will also exceed 1.40 m / cm 2 In this case, the influence of the pressure applied in the paper thickness direction of the toilet paper 13 inside the toilet roll 10 increases. As a result, the toilet paper 13 may be crushed and hardened, or if an emboss is applied to the toilet paper 13, the emboss may be crushed, resulting in inferior texture of the toilet paper 13 and the appearance beauty of the toilet roll 10.

[0212] In this embodiment, on the premise that the outer winding density ODE is higher than the inner winding density IDE, the outer winding density ODE is 1.10 m / cm 2 or more and 1.75 m / cm 2 or less, and the inner winding density IDE is 0.90 m / cm 2 or more and 1.40 m / cm 2 or less, the winding density is adjusted. According to the configuration of this embodiment, although the winding density varies depending on the position inside the toilet roll 10, the balance of the winding density is good, and it is possible to provide a toilet roll in which the occurrence of the above-mentioned concerns is prevented.

[0213] (Eighth Embodiment) The toilet roll according to the eighth embodiment is a variation of the fifth, sixth, or seventh embodiment. Unless otherwise specified, the configurations applicable to the fifth, sixth, or seventh embodiment are applicable to this embodiment.

[0214] The toilet roll 10 according to the eighth embodiment has the same configuration as the fifth, sixth, or seventh embodiment, and furthermore, an emboss is provided on the toilet paper 13.

[0215] The emboss is generally provided for the toilet paper 13 for the purpose of improving the feel such as softness and the cosmetic property. The emboss can be applied, for example, by inserting and pressing a sheet to be embossed between a pair of rolls of an embossing section 21 by a manufacturing apparatus for a toilet roll as illustrated in FIG. 3. Since the toilet roll 10 of this embodiment is multi-ply, any processing method can be adopted without particular limitation, such as a so-called single emboss in which embosses are applied after laminating each sheet constituting the multi-ply, or a so-called double emboss in which each sheet is embossed and then laminated.

[0216] [Operational Effects] The toilet roll 10 according to the eighth embodiment can exhibit the following operational effects in addition to the same operational effects as those described in the fifth, sixth, or seventh embodiment.

[0217] In the toilet roll 10 according to this embodiment, an emboss is provided on the toilet paper 13. According to this embodiment, due to the provision of the emboss, the quality of the toilet paper 13, such as fluffiness, water absorbency, and cosmetic property, is improved by partially destroying the aggregated state of the fibers constituting the toilet paper 13.

[0218] (Ninth Embodiment) The toilet roll according to the ninth embodiment is a variation of the eighth embodiment. Unless otherwise specified, the configurations applicable to the eighth embodiment are applicable to this embodiment.

[0219] In the toilet roll 10 according to the ninth embodiment, an emboss is provided on the toilet paper 13, and the emboss is a single emboss.

[0220] The single emboss is a process of forming an emboss by pressing the convex portion of the embossing roll against only one surface of the toilet paper 13 in which the sheets 11 are stacked by a predetermined number of overlapping sheets.

[0221] [Advantages and effects] In the case of double embossing in which each sheet 11 is embossed and then the respective sheets 11 are overlapped, when the same emboss height (emboss unevenness) as that of the single emboss is imparted, the paper thickness of the toilet paper 13 after overlapping may become too high and exceed a predetermined roll diameter. Further, when the emboss height imparted to each sheet 11 is lowered so that the paper thickness of the toilet paper 13 after overlapping is adjusted, the effects of embossing, for example, the effects of improving quality such as a fluffy feeling, water absorbency, and cosmetic properties will be inferior.

[0222] On the other hand, according to the single emboss, since the same pattern of emboss unevenness is imparted to the entire plurality of plies, the above-described problems do not occur. Therefore, according to the present embodiment, it is easy to achieve both a predetermined roll diameter and the effects of improving quality such as a fluffy feeling, water absorbency, and cosmetic properties.

Examples

[0223] (Examples 101 to 118) Through the following manufacturing process, single-ply toilet rolls of Examples 101 to 118 according to the embodiments of the present invention were manufactured. (a) Using a twin-wire former type paper-making machine (not shown), a wide sheet 11L was made from a papermaking slurry (paper stock) having a pulp composition with a ratio of hardwood bleached kraft pulp (LBKP) to softwood bleached kraft pulp (NBKP) (L / N ratio) of 65% by mass: 35% by mass, and a parent roll 11R with the sheet 11L wound thereon was obtained. (b) The parent roll 11R was installed in the sheet feeding function of the manufacturing apparatus shown in Fig. 3. While pulling out the sheet 11L from the parent roll 11R, for Examples 101 to 115, embossing was performed to impart embossed unevenness, and for Examples 116 to 118, perforations were formed without performing embossing. The end of the sheet 11L was pressed against a wide paper tube 14L coated with pick-up paste and adhesively fixed, and then wound around the paper tube 14L in a roll shape. (c) When the winding length reached a predetermined length, the winding end of the sheet 11L was cut, and the end portion of the sheet was adhesively fixed to the outer periphery of the roll with tail seal paste to obtain a wide toilet roll 10L. (d) The wide toilet roll 10L was cut to a predetermined width dimension (114 mm) to manufacture a toilet roll 10 in which a single-ply toilet paper 13 composed of the sheet 11 was wound in a roll shape. (Examples 201 to 214) Through the following manufacturing processes, two-ply toilet rolls of Examples 201 to 214 according to the embodiments of the present invention were manufactured. (a) Using a twin-wire former type paper-making machine (not shown), a wide sheet 11L was made from a papermaking slurry (paper stock) having a pulp composition with a ratio of hardwood bleached kraft pulp (LBKP) to softwood bleached kraft pulp (NBKP) (L / N ratio) of 65% by mass: 35% by mass, and a parent roll 11R with the sheet 11L wound thereon was obtained. (b) Two base roll rolls 11R were mounted on the sheet feeding function of the manufacturing apparatus shown in FIG. 3, and while pulling out the sheet 11L from each of the two base roll rolls 11R, in Examples 201 to 210, after overlapping the 11L, and in Example 211, before overlapping the sheet 11L, embossing was performed at the embossing section 21 to impart embossed unevenness, and in Examples 212 to 2114, the sheets 11L were overlapped without performing embossing. Next, perforations were formed, and the end portion of the sheet 11L was pressed against a wide paper tube 14L coated with pickup paste and adhered and fixed, and it was wound around the paper tube 14L in a roll shape. (c) When the winding length reached a predetermined length, the winding end of the sheet 11L was cut, and the end portion of the sheet was adhered and fixed to the outer periphery of the roll with tail seal paste to obtain a wide toilet roll 10L. (d) The wide toilet roll 10L was cut to a predetermined width dimension (114 mm) to manufacture a toilet roll 10 in which a two-ply toilet paper 13 composed of two sheets 11 was wound in a roll shape.

[0224] (Comparative Examples 101 to 104 and Comparative Examples 201 to 204) Toilet rolls of single-ply Comparative Examples 101 to 104 shown in Table 4 and two-ply Comparative Examples 201 to 204 shown in Table 7 were manufactured.

[0225] (Measurement and Evaluation) For the manufactured toilet rolls of the examples and comparative examples, the following measurements and evaluations were performed. The measurement was carried out after conditioning the sample in an environment conforming to Japanese Industrial Standard JIS P8111 (temperature 23 ± 1°, humidity 50 ± 2%RH).

[0226] <Measurement> 〔Winding length of toilet roll [m]〕 The toilet paper was unwound from the toilet roll, and the length of the toilet paper was actually measured. The measurement was carried out in 0.5 m increments, and the fractional part was rounded down. Also, for the length and roll length used for measuring the winding density, etc., for example, based on the product specifications of the toilet roll, and while unwinding the toilet paper from the toilet roll, the length of the unwound toilet paper was measured, and using those values, the length of the toilet paper wound around the paper tube at that stage in the toilet roll was determined.

[0227] 〔Toilet roll outer diameter [mm]〕 The outer diameter of the roll of the toilet roll was measured with a vernier caliper, and the decimal part was rounded off.

[0228] 〔Core diameter of paper tube [mm]〕 The outer diameter of the paper tube of the toilet roll was measured with a vernier caliper, and the decimal part was rounded off.

[0229] 〔Grammage [g / m 2 〕 The toilet paper was unwound from the toilet roll, and in accordance with the provisions of Japanese Industrial Standard JIS P8124, the grammage per sheet of the sheet constituting the toilet paper was measured.

[0230] 〔Winding density〕 When the total length (roll length) L of the toilet paper contained in each toilet roll sample was taken as 100% of the length, the winding density was determined by the following formulas (I) and (II). Also, for the winding density of the roll-shaped part where the toilet paper regions with lengths of 90% (0.90L), 75% (0.75L), 50% (0.5), 25% (0.25L), and 10% (0.10L) from the edge on the roll center side of the toilet roll were wound around the paper tube, using the following formulas (I) and (II) by analogy, with those lengths used as the roll length, the calculation was performed.

[0231] (Winding density (m / cm 2 )) = (Roll length (m) × Ply number) ÷ (Roll cross-sectional area (cm 2 )) ···(I)

[0232] (Roll cross-sectional area (cm 2 )) = {(Roll diameter (cm) ÷ 2) 2 × 3.14 - (Core diameter DC (cm) ÷ 2) 2 × 3.14} ··· (II)

[0233] 〔Embossing depth〕 At the positions of the toilet paper where the lengths from the edge on the roll center side of the toilet roll are 90% (0.90L) and 10% (0.10L) (i.e., the 90% line and the 10% line), the embossing depth was measured according to the above test apparatus, conditions, and analysis method.

[0234] 〔HF value〕 Regarding the areas of the toilet paper with lengths of 90% (0.90L), 75% (0.75L), 50% (0.5), 25% (0.25L), and 10% (0.10L) from the edge on the roll center side of the toilet roll, the HF value was determined.

[0235] The HF value (hand feel value) is a numerical value that can be used for quantitative evaluation by quantifying the tactile sensations such as smoothness, flexibility, and volume feeling of toilet tissue paper. The HF values of the toilet papers in the examples and comparative examples were measured using a Tissue Softness Analyzer (manufactured by Emtec Electronic GmbH). A sample cut into a circle with a diameter of 112.8 mm was placed on the sample stage, and a rotor with a blade was pushed into it from above with a pushing pressure of 100 mN. Then, the rotor with the blade was rotated at a rotational speed of 2.0 rotations / second, and the vibration frequency at that time was measured. Also, for another sample cut into a circle with a diameter of 112.8 mm, the vertical deformation displacement amount when the rotor with the blade was pushed in with pressures of 100 mN and 60 mN was calculated. The HF value is a value calculated from the vibration frequency and the deformation displacement amount, and the calculation algorithm used TP II. In addition, the above measurements were performed 10 times each for the exposed surfaces of the outer roll toilet paper and the inner roll toilet paper of each sample (that is, the front and back surfaces of the sheet). Outliers were excluded from the obtained measurement data by the Hampel identifier method, and the average value was calculated for each surface. Furthermore, the average value of the HF values of both surfaces was calculated from the average values of the HF values of each surface calculated in this way, and this was used as the HF value for evaluation. The above measurements of the samples were carried out in an environment conforming to ISO187 (temperature 23 ± 1°C, relative humidity 50 ± 2%). Also, during the measurement, calibration was performed with a standard sample (eme tec ref.2X(nn.n)) according to the attached instruction manual, and the algorithm was set to TP II. Emtec measurement system Ver.3.22 was used for the calculation software.

[0236] In addition, the sample used for measuring the HF value was cut out from the edge of the toilet paper on the side opposite to the edge on the roll center side of the toilet roll, that is, the edge on the outer peripheral side, in the area of the toilet paper to be measured. Specifically, for example, when obtaining the HF value for the area of the toilet paper with a length of 90% (0.90L) from the edge on the roll center side of the toilet roll, sampling was performed from the side closer to the 90% line in the area of the toilet paper, with as little spacing as possible.

[0237] The larger the value of the HF value, the better the texture. The greater the difference in the HF value between the outer wound area (90%) and the inner wound area (10%), the greater the perceived difference in quality. When the difference in the HF value between the outer wound area (90%) and the inner wound area (10%) exceeds 5.0 points, it is evaluated that there may be a perceived difference in quality during use, which is not preferable. The difference in the HF value between the outer wound area (90%) and the inner wound area (10%) is more preferably 4.0 points or less, and even more preferably 3.0 points or less.

[0238] The test results are shown in Tables 1 to 7.

[0239]

Table 1

[0240]

Table 2

[0241]

Table 3

[0242]

Table 4

[0243]

Table 5

[0244] [Table 6]

[0245] [Table 7]

[0246] (Test Results of Single-Ply Products) First, referring to Tables 1 to 4, examine the test results for the single-ply examples and comparative examples. As shown in Tables 1 to 4, Examples 101 to Comparative Example 104 were all single-ply toilet rolls with single-ply toilet paper wound in a roll shape, having a roll diameter of 90 m or more. Also, the width dimension of each sample was 114 mm, and the core diameter was 38 mm to 41 mm.

[0247] Among all the single-ply samples, the toilet paper of Examples 101 to 115 and Comparative Examples 101 to 103 had embossing, while the toilet paper of Examples 116, 117, 118, and Comparative Example 104 did not have embossing. For this reason, the toilet rolls of Examples 116, 117, 118, and Comparative Example 104 had the longest roll length among all the single-ply samples, which was 150 m.

[0248] For the toilet rolls of Examples 101 to 118 (all single-ply examples), the outer roll density of the toilet roll calculated with respect to the outer roll area of the toilet roll corresponding to the area of the toilet paper where the length from the end on the roll center side of the toilet roll was in the range of 85% or more and 95% or less of the roll length was higher than the inner roll density of the toilet roll calculated with respect to the inner roll area of the toilet roll corresponding to the area of the toilet paper where the length from the end on the roll center side of the toilet roll was in the range of 5% or more and 15% or less of the roll length.

[0249] In addition, for the toilet rolls of Examples 101 to 118 (all single-ply examples), the outer winding density, calculated as the winding density of the roll-shaped portion where toilet paper is wound from the end of the toilet roll on the center side of the roll to 90% of the winding length, was more than 1.00 times and less than 1.50 times the inner winding density, calculated as the winding density of the roll-shaped portion where toilet paper is wound from the end of the toilet roll on the center side of the roll to 10% of the winding length.

[0250] In addition, the toilet rolls of Examples 101 to 114 and Examples 116 to 118 all have an outer winding density of 1.15 m / cm 2 More than 1.55m / cm 2 and the inner winding density is 0.80m / cm 2 More than 1.20m / cm 2 The results were as follows.

[0251] In addition, the toilet roll of Example 115 has a basis weight of 19.8 g / m compared to the other samples. 2 The winding length was the shortest among all samples at 100m. The inner winding density was 0.80m / cm 2 More than 1.20m / cm 2 The outer winding density was 1.15m / cm 2 Slightly lower than 1.12m / cm 2 It was.

[0252] In addition, the toilet rolls of Examples 101 to 115 were embossed products, and the embossing depth of the outer rolled region measured for the outer rolled region (90%) was smaller than the embossing depth of the inner rolled region measured for the inner rolled region, with the embossing depth of the outer rolled region being 80 μm or more and 115 μm or less, and the embossing depth of the inner rolled region being 85 μm or more and 145 μm or less.

[0253] The toilet rolls of Examples 101 to 118 (all single-ply examples) had a small difference in HF value between the outer winding region (90%) and the inner winding region (10%), which was only a few points and less than 5.0 points, which was good.

[0254] In addition, the toilet rolls of Examples 101 to 118 (all single-ply examples) had an HF value that was almost constant even in regions other than the outer winding region (90%) and the inner winding region (10%), and there was little change in texture throughout the entire area of the toilet paper regardless of the length of the toilet paper.

[0255] In Comparative Example 101, the winding density of the inner winding region (10%) was higher than that of the outer winding region (90%), and the winding density of the outer winding region (90%) was less than 1.0 times that of the inner winding region (10%). Also, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the start and end parts of the toilet roll.

[0256] In Comparative Example 102, the winding density of the inner winding region (10%) was comparable to that of the outer winding region (90%). However, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the start and end parts of the toilet roll.

[0257] In Comparative Example 103, the winding density of the inner winding region (10%) was higher than that of the outer winding region (90%), and the winding density of the outer winding region (90%) was less than 1.0 times that of the inner winding region (10%). Also, the winding density (100%) calculated as the winding density of the roll-shaped part where the toilet paper was wound up to 100% of the roll length was low, and therefore, the roll diameter was very large, exceeding the dimensions that could fit within a general toilet roll holder and be rotatably supported therein. Also, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the start and end parts of the toilet roll.

[0258] Comparative Example 104, which is a non-embossed product, had almost the same winding density in the inner winding region (10%) and the outer winding region (90%). Also, there was a large difference in the HF value between the outer winding region (90%) and the inner winding region (10%), exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the starting part and the ending part of the toilet roll.

[0259] (Test Results of Multiple-Ply Products) Next, referring to Tables 5 to 7, the test results for the examples and comparative examples of multiple-ply (two-ply) will be examined.

[0260] As shown in Tables 5 to 7, Examples 201 to Comparative Example 204 were all two-ply toilet rolls in which two-ply toilet paper was wound, and the winding diameter was 100 mm or more and 140 mm or less. Also, the width dimension of each sample was 114 mm, and the core diameter was 38 mm to 41 mm.

[0261] Among all the multiple-ply samples, single embossing was applied to the toilet paper of Examples 201 to 210 and Comparative Examples 201 to 203, double embossing was applied to the toilet paper of Example 211, and no embossing was applied to Examples 212 to 214 and Comparative Example 204. The sample without embossing had the longest winding length among all the multiple-ply samples, which was 75 m.

[0262] For the toilet rolls of Examples 201 to 214 (all multiple-ply examples), the outer winding density of the toilet roll calculated for the outer winding region of the toilet roll corresponding to the region of the toilet paper where the length from the end on the roll center side of the toilet roll was 85% or more and 95% or less of the winding length was higher than the inner winding density of the toilet roll calculated for the inner winding region of the toilet roll corresponding to the region of the toilet paper where the length from the end on the roll center side of the toilet roll was 5% or more and 15% or less of the winding length.

[0263] In addition, for the toilet rolls of Examples 201 to 214 (all multiple-ply examples), the outer winding density calculated as the winding density of the roll-shaped portion where toilet paper was wound from the end on the roll center side of the toilet roll to 90% of the winding length was greater than 1.00 times and less than or equal to 1.50 times the inner winding density calculated as the winding density of the roll-shaped portion where toilet paper was wound from the end on the roll center side of the toilet roll to 10% of the winding length.

[0264] In addition, for the toilet rolls of Examples 201 to 214 (all multiple-ply examples), the outer winding density was 2 1.10 m / cm or more and 2 1.75 m / cm or less, and the inner winding density was 2 0.90 m / cm or more and 2 1.40 m / cm or less.

[0265] In addition, the toilet rolls of Examples 201 to 211, which are embossed products, had a larger HF value and better texture compared to the toilet rolls of Examples 212 to 214, which are non-embossed products. Similarly, Comparative Examples 201 to 203, which are embossed products, had a larger HF value and better texture compared to Comparative Example 204, which is a non-embossed product.

[0266] In addition, the toilet rolls of Examples 201 to 211 and the toilet rolls of Comparative Examples 201 to 203 are both embossed products. In the toilet rolls of Examples 201 to 211, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was small, being from about several points to less than 5.0 points, which was good.

[0267] In addition, for the toilet rolls of Examples 201 to 214 (all multiple-ply examples), the HF value was almost constant even in regions other than the outer winding region (90%) and the inner winding region (10%), and the change in texture was small over the entire area of the toilet paper regardless of the length of the toilet paper.

[0268] In Comparative Example 201, the winding density of the inner winding region (10%) and the winding density of the outer winding region (90%) were substantially the same. Also, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the starting portion and the ending portion of the toilet roll.

[0269] In Comparative Example 202, the winding density of the inner winding region (10%) was higher than the winding density of the outer winding region (90%). Also, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, exceeding 10 points, and there was a difference in the quality of the toilet paper between the starting portion and the ending portion of the toilet roll.

[0270] In Comparative Example 203, the winding density of the inner winding region (10%) was higher than the winding density of the outer winding region (90%), and the winding density of the outer winding region (90%) was less than 1.0 times the winding density of the inner winding region (10%). Also, the winding density (100%) calculated as the winding density of the roll-shaped portion where the toilet paper was wound up to 100% of the roll length was low, and therefore, the roll diameter was extremely large compared to other samples. Also, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, greatly exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the starting portion and the ending portion of the toilet roll.

[0271] In Comparative Example 204 which is a non-embossed product, the winding density of the inner winding region (10%) and the winding density of the outer winding region (90%) were substantially the same. Also, the difference in HF value between the outer winding region (90%) and the inner winding region (10%) was large, exceeding 5.0 points, and there was a difference in the quality of the toilet paper between the starting portion and the ending portion of the toilet roll.

[0272] In the above-described embodiment, the present invention has been described assuming that the toilet roll 10 has the paper tube 14. However, the present invention is not limited thereto, and is also applicable to a coreless toilet roll having no paper tube 14.

[0273] The present invention should be construed only from the matters described in its claims, and also in the above-described embodiments, any changes and modifications included in the concept of the present invention are possible other than the matters described. That is, all matters in the above-described embodiments are not for limiting the present invention, and can be arbitrarily changed according to their uses, purposes, etc., including any configurations not directly related to the present invention.

Explanation of Signs

[0274] B Backup roll F Feeding means N Nip roll Vb Rotation speed of backup roll Vf Feeding speed of feed roll Vn Rotation speed of nip roll Vu Pay-out speed of sheet Vw Winding speed of winding roll W Winding roll 10 Toilet roll 10L Wide toilet roll 11 Sheet 11L Wide sheet 11R Parent roll 13 Toilet paper 14 Paper tube (core) 14L Wide paper tube 21 Embossing part 25 Perforation forming part 26 Winding part 28c Comb-shaped cutter 28h Rotary blade holder 29c Linear cutter 29h Fixed blade holder 30 Guide roll 32 Guide roll or expander roll 33 Cutter roll

Claims

1. A toilet roll in which a single ply of toilet paper is wound around a paper tube into a roll, The length of the roll is more than 90m. The outer winding density ODE of the toilet roll calculated for the outer winding region of the toilet roll corresponding to the region of the toilet paper in which the length from the end of the toilet roll center side of the toilet roll is in the range of 85% to 95% of the winding length is higher than the inner winding density IDE of the toilet roll calculated for the inner winding region of the toilet roll corresponding to the region of the toilet paper in which the length from the end of the toilet roll center side of the toilet roll is in the range of 5% to 15% of the winding length, The toilet roll is characterized in that an outer winding density ODE 90 calculated as the winding density of a roll-shaped portion in which the toilet paper is wound from the end of the toilet roll on the roll center side to a length of 90% of the winding length is greater than 1.00 and less than 1.50 times an inner winding density IDE 10 calculated as the winding density of a roll-shaped portion in which the toilet paper is wound from the end of the toilet roll on the roll center side to a length of 10% of the winding length.

2. The outer winding density ODE is 1.15 m / cm 2 1.55m / cm or more 2 and the inner winding density IDE is 0.80 m / cm 2 1.20m / cm or more 2 2. The toilet roll according to claim 1, characterized in that:

3. The toilet paper is embossed, an outer rolled region embossing depth measured with respect to the outer rolled region is less than an inner rolled region embossing depth measured with respect to the inner rolled region; The outer roll region embossing depth is 80 μm or more and 115 μm or less, The toilet roll according to claim 1 or 2, wherein the embossing depth of the inner roll region is 85 μm or more and 145 μm or less.

4. A toilet roll in which toilet paper having a number of plies p (p is an integer of 2 or more) is wound around a paper tube into a roll shape, The number of plies p and the winding length L (m) satisfy the relationship of the formula L≧90 / p, The outer winding density ODE of the toilet roll calculated for the outer winding region of the toilet roll corresponding to the region of the toilet paper whose length from the end of the toilet roll center side is in the range of 85% to 95% of the winding length L is higher than the inner winding density IDE of the toilet roll calculated for the inner winding region of the toilet roll corresponding to the region of the toilet paper whose length from the end of the toilet roll center side is in the range of 5% to 15% of the winding length L, The toilet roll is characterized in that an outer winding density ODE 90 calculated as the winding density of a roll-shaped portion in which the toilet paper is wound from the end of the toilet roll on the roll center side to a length that is 90% of the winding length L is greater than 1.00 and less than 1.50 times an inner winding density IDE 10 calculated as the winding density of a roll-shaped portion in which the toilet paper is wound from the end of the toilet roll on the roll center side to a length that is 10% of the winding length L.

5. The outer winding density ODE is 1.10 m / cm 2 1.75m / cm or more 2 and the inner winding density IDE is 0.90 m / cm 2 1.40m / cm or more 2 5. The toilet roll according to claim 4, characterized in that:

6. 6. The toilet roll according to claim 4 or 5, wherein the toilet paper is embossed.

7. 7. The toilet roll of claim 6, wherein the embossment is a single embossment.

Images