Toilet roll

Abstract

To provide a toilet roll having only a small difference in skin touch between surface and back face of a rolled-out toilet paper.SOLUTION: Two-plies toilet papers are wound, a winding diameter is 104.5-130 mm, a winding length is 45-106 m, a sheet has convex and concave by embossment processing, a basis weight is 11-18 g / m2, a paper thickness is 75-130 μm, a ratio between TS7 value on a roll outer surface side and TS7 value on a roll inner surface side of the 2-plies toilet paper as measured by the Tissue Softness Measurement device TSA is 0.8-1.2, a ratio (P) between TS7 value of a laminate outer surface side and TS7 value of a laminate inner surface side of the sheet on the roll outer surface side is 1 or less, a ratio (Q) between TS7 value of a laminate outer surface side and TS7 value of a laminate inner surface side of the sheet on the roll inner surface side is 1 or less, and a ratio between the ratio P and the ratio Q is 0.85 or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Some toilet paper wrapped around toilet rolls is embossed to improve wiping performance and to impart bulk, flexibility, surface smoothness, etc. (Patent Document 1 below).

[0003] On the other hand, toilet rolls are generally set in a toilet roll holder so that they can rotate freely, and the user pulls out a specified length of toilet paper from the set toilet roll and then uses it. At that time, the user manually rewinds or zigzags the pulled out toilet paper until it is stacked to an appropriate size and thickness that is easy to use.

[0004] When a user rewinds or folds the toilet paper, the toilet roll may be rewound so that the side that was on the outer side of the roll becomes the side that touches the skin, or the side that was on the inner side of the roll becomes the side that touches the skin. In other words, the side of the toilet paper that touches the skin may differ depending on the user or each time it is used.

[0005] On the other hand, in recent years, there has been a demand for toilet rolls that can reduce the frequency of purchases, the number of replacements, and the storage space required, and the length of toilet paper wound on one roll is becoming longer. For example, traditionally, products with one ply of toilet paper, also called single, were around 50 m long, and products with two plies of toilet paper, also called double, were around 25 m long, but in recent years, products with roll lengths of about 1.5 to 3 times that length have become commercially available.

[0006] Since the diameter of a toilet roll is limited to a certain extent in relation to the toilet roll holder, in order to make the toilet roll longer, the basis weight and paper thickness of the toilet paper are reduced, and the tension during winding is increased during the manufacturing process. As a result, making the toilet paper longer is likely to result in a decrease in cushioning in the thickness direction of the toilet paper, crushing of unevenness due to embossing, and differences in elongation of the sheet on the front and back, which can easily lead to differences in the feel when the toilet roll touches the skin between the outer surface of the roll and the inner surface of the roll.

[0007] Adjusting the balance between the texture of toilet paper and the softness of the roll itself by lengthening the toilet roll has been attempted, for example, as shown in Patent Document 1 below, but reducing the difference in feel between the front and back of the unrolled toilet paper has not been sufficiently considered or achieved. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2017-64191 A [Patent Document 2] Patent Publication No. 2022-72234 Summary of the Invention [Problem to be solved by the invention]

[0009] As mentioned above, the side of the toilet paper that touches the skin when wound into a toilet roll may differ depending on the user or each time the toilet paper is used, so it is desirable that there is little or no difference in feel between the front and back of the toilet paper when it is pulled out.

[0010] Therefore, a main object of the present invention is to provide a toilet roll in which there is little or no difference in the feel of the front and back of the toilet paper when it is pulled out. [Means for solving the problem]

[0011] The means for solving the above problems are as follows.

[0012] The first means is A toilet roll in which two sheets of toilet paper are laminated together to form a two-ply toilet paper roll, The winding diameter is 104.5 to 130 mm, and the winding length is 45 to 106 m. The sheet has an embossed texture and has a basis weight of 11 to 18 g / m 2 The toilet paper has a thickness of 75 to 130 μm, and The ratio (T1 / T2) of the TS7 value (T1) on the outer side of the roll to the TS7 value (T2) on the inner side of the roll of a two-ply toilet paper, as measured by a tissue softness measuring device (TSA), is 0.8 to 1.2; The ratio P(T3 / T4) of the TS7 value (T3) on the outer layer side of the sheet on the outer side of the roll to the TS7 value (T4) on the inner layer side of the sheet, measured by a tissue softness measuring device TSA, is 1 or less; The ratio Q(T5 / T6) of the TS7 value (T5) on the outer layer of the sheet on the inner layer of the roll to the TS7 value (T6) on the inner layer of the sheet, measured by a tissue softness measuring device TSA, is 1 or less; The ratio (P / Q) of the ratio P to the ratio Q is 0.8 to 1.2. This is a toilet roll characterized by the above.

[0013] The second method is The toilet roll according to the first means has a ratio (D3 / D5) of the D value (D3) of the laminated outer surface side of the sheet on the outer surface side of the roll to the D value (D5) of the laminated outer surface side of the sheet on the inner surface side of the roll, measured by a tissue softness measuring device TSA, of 0.9 to 1.1.

[0014] The third method is The TS7 value (T1) of the outer surface of a two-ply toilet paper roll measured by the tissue softness measuring device TSA is 12 dBV. 2is less than or equal to rms, The ratio (H1 / H2) of the HF value (H1) on the outer side of the roll to the HF value (H2) on the inner side of the roll of the two-ply toilet paper, as measured by a tissue softness measuring device (TSA), is 0.9 to 1.1; The ratio (H3 / H4) of the HF value (H3) on the outer layer side of the sheet on the outer side of the roll to the HF value (H4) on the inner layer side of the sheet, as measured by a tissue softness measuring device (TSA), is 1 or more; The ratio B (H5 / H6) of the HF value (H5) on the outer layer side of the sheet on the inner layer side of the roll to the HF value (H6) on the inner layer side of the sheet on the inner layer side of the roll, as measured by a tissue softness measuring device (TSA), is 1 or more. The toilet roll according to the first or second aspect.

[0015] The fourth measure is The toilet roll according to the first means is a two-ply double-embossed toilet paper in which sheets each have a recess on one side and a protrusion on the other side that corresponds to the recess, and the sheets are laminated together so that the surfaces on which the recesses are formed are the outer surfaces.

[0016] The fifth measure is: In the toilet roll according to the first or fourth aspect, the embossed pattern of the recesses is such that the recesses are linearly arranged at a predetermined interval along a predetermined direction, and the angle between the predetermined direction and the paper flow direction is 0 to 45 degrees.

[0017] According to the present invention, a toilet roll is provided in which there is little or no difference in the feel of the front and back of the pulled out toilet paper. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of the toilet roll of the present embodiment. [Diagram 2] FIG. 2 is a side view of a toilet roll and toilet paper. [Diagram 3]FIG. 13 is a diagram for explaining an embossing pattern. [Figure 4] FIG. 11 is a diagram for explaining another embossing pattern. [Diagram 5] FIG. 13 is a diagram for explaining another embossing pattern. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Next, the toilet roll of this embodiment will be described below with reference to the drawings. However, the present invention is not limited to this embodiment.

[0020] [Toilet roll] As shown in Figures 1 and 2, the toilet roll 1 of this embodiment is a two-ply toilet paper 10, consisting of two sheets 11 and 12 laminated together, wound into a roll around a paper tube 20, also known as a tube core.

[0021] This toilet roll 1 has a roll diameter L1 (diameter) of 104.5 to 130 mm and a roll length of 45 to 106 m. A roll diameter L1 of 104.5 to 130 mm is a roll diameter that can be set in many toilet roll holders both in Japan and overseas. The roll diameter is a value measured using a diameter rule manufactured by Muratec KDS Co., Ltd. or an equivalent device. The measured value is the average value of measurements taken at three different locations in the width direction.

[0022] The roll length is the total length of the rolled toilet paper 10. Whereas the roll length of a conventional toilet roll made of two plies of toilet paper was around 25 m, this toilet roll 1 has a roll length of 45 to 106 m, which is about 1.5 to 3 times the roll length of the conventional toilet roll, and can reduce the purchase frequency, replacement frequency, and storage space. A roll length of at least about twice that of the conventional toilet roll is desirable for obtaining the effects of the present invention and is particularly preferred by users in terms of purchase frequency, replacement frequency, and storage space, and therefore a roll length of 50 m to 106 m is particularly desirable.

[0023] The outer diameter (paper tube diameter) L2 of the paper tube 20 around which the toilet paper 10 is wound is not necessarily limited, but can be a common outer diameter, specifically 33 to 45 mmφ. Furthermore, the width L3 of the toilet roll 1 is not limited. It is generally 100 to 120 mm, and the toilet roll 1 of this embodiment can also be this width.

[0024] [toilet paper] In the toilet paper 10 of this embodiment, the sheets 11 and 12 have projections and recesses due to embossing, and the basis weight of each sheet is 11 to 18 g / m 2 and the paper thickness of the two-ply toilet paper is 75 to 130 μm. The basis weight is a value measured based on the basis weight measurement method of JIS P 8124 (1998). The paper thickness is a value measured at 100 kPa ± 10 kPa based on ISO 534:2011, which corresponds to JIS P 8118 (2014). Even if the toilet roll 1 has the above-mentioned roll diameter and roll length, if the basis weight and paper thickness are within this range, it can be adjusted to a toilet paper 10 that has little or no feeling of use on both sides.

[0025] Here, the toilet roll 1 of this embodiment is characterized in that the ratio (T1 / T2) of the TS7 value (T1) on the outer roll side 31 of the two-ply toilet paper 10 to the TS7 value (T2) on the inner roll side 32, measured by a tissue softness measuring device TSA, is 0.8 to 1.2.

[0026] [Tissue Softness TSA Device] The tissue softness measuring device TSA according to this embodiment is a tissue softness measuring device TSA manufactured by Emtec Electronic GmbH (Japan distributor, Nippon Luft Co., Ltd.) of Germany, and its equivalents. TS7 in this embodiment is a value measured by this tissue softness measuring device TSA manufactured by Emtec. The feeling of use of the toilet paper 10 is affected by the characteristics of the toilet paper, such as "smoothness / roughness," "softness," and "rigidity." This tissue softness measuring device TSA can digitize the parameters (represented by TS750, TS7, and D, respectively) that are indicators of these three characteristics through acoustic measurement and deformation measurement. In addition, this tissue softness measuring device TSA can calculate the HF (hand feel) value by performing an analysis using an algorithm based on these obtained parameters (raw data) and the basis weight, thickness, number of plies, etc. of the toilet paper 10. The HF value is a value used for a comprehensive quantitative evaluation of the feel of the toilet paper 10, which is correlated with the results of a human feel (panel test). In addition, when performing measurements using the tissue softness measuring device TSA according to this embodiment, a sample is processed into a circle having a diameter of approximately 112.8 mm using a sample punch manufactured by Emtec, and the software used for analysis and quantification is the Emtec measurement system.

[0027] [TS7] In the toilet roll 1 of this embodiment, as described above, the ratio (T1 / T2) of the TS7 value (T1) of the roll outer surface side 31 of the two-ply toilet paper 10 to the TS7 value (T2) of the roll inner surface side 32 is 0.8 to 1.2, but if the ratio (T1 / T2) of the TS7 value (T1) of the roll outer surface side 31 to the TS7 value (T2) of the roll inner surface side 32 is 0.8 to 1.2, the front and back surfaces have the same softness, and the user is likely to feel that the front and back surfaces are not used or are small. Here, the TS7 value is the intensity of the maximum peak of the spectrum including a frequency of 6500 Hz obtained when the toilet paper 10 set on the sample stage is pressed from above with a bladed rotor at a pressing pressure of 100 mN, rotated at a rotation speed of 2.0 per second, and the vibration of the sample stage is measured with a vibration sensor, and is a parameter that is mainly affected by "softness" in terms of fluffiness, surface softness, and bulk softness. The TS7 value of the outer roll side 31 is a value measured with the outer roll side 31 of the toilet paper 10 as it was wound facing up relative to the sample stage. Conversely, the TS7 value of the inner roll side 32 is a value measured with the inner roll side 32 of the toilet paper 10 as it was wound facing up relative to the sample stage. The relationship between the measurement surfaces of the outer roll side and the inner roll side is the same for the TS750 value and the D value, which will be described later. It is said that the smaller the TS7 value, the better the "softness," but the specific measured value is not necessarily limited for the toilet paper 10 of this embodiment. However, preferably, the TS7 value (T1) of at least the outer roll side 31 is 12 dBV or more. 2 It is desirable that the roll outer surface side 31 and the roll inner surface side 32 are 12 dBV or less. 2It is desirable that the TS7 is equal to or less than rms. TS7 is affected by the stiffness of each fiber constituting the toilet paper 10, such as the softness and hardness, the coarseness and density of the fibers in the sample, the bond strength between the fibers, the micro- and macro-compressibility, and added chemicals (softeners, starch, dry strength agents). Therefore, in order to make the ratio (T1 / T2) of the TS7 value (T1) of the outer side 31 of the roll of the toilet paper 10 to the TS7 value (T2) of the inner side 32 of the roll be 0.8 to 1.2 as described above, the sheet 11 constituting the outer side 31 of the roll and the sheet 12 constituting the inner side 32 of the roll have the same fiber raw material, fiber basis weight, beating degree, added chemicals, calendar conditions, paper thickness, papermaking conditions, etc. as a standard, and from that standard, the tension difference at the inner side position and the outer side position when winding during manufacturing and the difference in the transport rolls that contact each sheet in the transport path are taken into consideration, and adjustments are made appropriately.

[0028] On the other hand, in the toilet roll 1 of this embodiment, the ratio P(T3 / T4) of the TS7 value (T3) of the laminate outer surface side 33 of the sheet 11 on the roll outer surface side 31 to the TS7 value (T4) of the laminate inner surface side 34 is 1 or less, and the ratio Q(T5 / T6) of the TS7 value (T5) of the laminate outer surface side 35 of the sheet 12 on the roll inner surface side 32 to the TS7 value (T6) of the laminate inner surface side 36 is 1 or less, as measured by a tissue softness measuring device TSA. When the 2-ply toilet paper 10 is used, the surfaces of the sheet 11 on the roll outer surface side 31 and the sheet 12 on the roll inner surface side 32 that come into contact with the skin are the laminate outer surfaces 33, 35. Therefore, the ratio P (T3 / T4) being 1 or less and the ratio Q (T5 / T6) being 1 or less means that the laminated outer surfaces 33, 35, which are the surfaces of the sheet 11 on the outer side 31 of the roll and the sheet 12 on the inner side 32 of the roll that come into contact with the skin, are softer than the laminated inner surfaces 34, 36 that do not come into contact with the skin. Therefore, in the toilet roll 1 of this embodiment, in combination with the ratio (T1 / T2) of the TS7 value (T1) of the outer side 31 of the roll of the toilet paper 10 to the TS7 value (T2) of the inner side 32 of the roll, the difference in softness between the front and back of the two-ply toilet paper 10 is small, and the sheet 11 on the outer side 31 of the roll and the sheet 12 on the inner side 32 of the roll both have soft laminated outer surfaces 33, 35 that come into contact with the skin. Here, in order to make the laminate outer surface sides 33, 35 of the sheet 11 on the outer surface side 31 of the roll and the sheet 12 on the inner surface side 32 of the roll soft, adjustments can be made, for example, by adjusting the felt-like wet paper during papermaking, the blade angle of the Yankee dryer, the crepe rate, and calendaring.

[0029] Furthermore, in the toilet paper of this embodiment, the ratio (P / Q) of the ratio P to the ratio Q is 0.8 to 1.2. When the ratio (P / Q) of the ratio P to the ratio Q is 0.8 to 1.2, coupled with the fact that the ratios P ​​(T3 / T4) and Q (T5 / T6) are both 1 or less, the laminated outer surfaces 33, 35 of the sheet 11 on the roll outer surface side 31 and the sheet 12 on the roll inner surface side 32 that come into contact with the skin are both soft, and the difference in softness between the sheet 11 on the roll outer surface side 31 and the sheet 12 on the roll inner surface side 32 is small.

[0030] [D] On the other hand, in the toilet roll 1 of this embodiment, the ratio (D3 / D5) of the value of D (D3) of the laminated outer surface side 33 of the sheet 11 on the roll outer surface side 31 to the value of D (D5) of the laminated outer surface side 35 of the sheet 12 on the roll inner surface side 32, measured by the above-mentioned tissue softness measuring device TSA, is preferably 0.9 to 1.1. The value of D measured by this tissue softness measuring device TSA is represented by the amount of deformation displacement in the vertical direction of the sample between the pressing pressures of 100 mN and 600 mN when a sample set on a sample stage of the tissue softness measuring device TSA is pressed from above with pressing pressures of 100 mN and 600 mN without rotating the bladed rotor of the measuring device, and is a parameter that is affected by rigidity. The ratio (D3 / D5) of the D value (D3) of the laminated outer surface side 33 of sheet 11 on the outer side 31 of the roll to the D value (D5) of the laminated outer surface side 35 of sheet 12 on the inner side 32 of the roll being 0.9 to 1.1 means that there is no or only a small difference in rigidity from the laminated outer surfaces 33, 35, which are the surfaces of sheet 11 on the outer side 31 of the roll and sheet 12 on the inner side 32 of the roll that come into contact with the skin, and there is no difference between the front and back in terms of conformability to the skin during use, resulting in an equal fit regardless of which side comes into contact with the skin, resulting in toilet paper 10 that feels less or has less feeling of use on the front and back. Here, in order to achieve a ratio (D3 / D5) of 0.9 to 1.1 between the D value (D3) of the laminated outer surface side 33 of the sheet 11 on the outer surface side 31 of the roll and the D value (D5) of the laminated outer surface side 35 of the sheet 12 on the inner surface side 32 of the roll, the fiber raw materials, fiber basis weight, degree of beating, added chemicals, calendaring conditions, paper thickness, papermaking conditions, etc. of the sheet 11 on the outer surface side 31 of the roll and the sheet 12 on the inner surface side 32 of the roll are made the same as a standard, and adjustments are made appropriately from that standard taking into account the difference in tension when winding at the inner surface position and the outer surface position when winding the roll, the difference in the transport paths of each sheet 11, 12, etc.

[0031] [TS750] On the other hand, in the two-ply toilet roll 1 of this embodiment, it is preferable that the ratio (S1 / S2) of the TS750 value (S1) of the roll outer surface side 31 of the two-ply toilet paper 10 to the TS750 value (S2) of the roll inner surface side 32, measured by the tissue softness measuring device TSA, is 0.9 to 1.2, and further, it is preferable that the ratio A (S3 / S4) of the TS750 value (S3) of the laminate outer surface side 33 of the sheet 11 on the roll outer surface side 31 to the TS750 value (S4) of the laminate inner surface side 34 is 1 or less, and the ratio B (S5 / S6) of the TS750 value (S5) of the laminate outer surface side 35 of the sheet 12 on the roll inner surface side 32 to the TS750 value (S6) of the laminate inner surface side 36 is 1 or less, and the ratio A to the ratio B (A / B) is 0.8 to 1.2.

[0032] TS750 measured by the tissue softness measuring device TSA is the intensity of the first maximum peak of the spectrum seen from the low frequency side obtained when a bladed rotor is pressed from above against a toilet paper 10 placed on a sample stage with a pressing pressure of 100 mN, then rotated at a rotation speed of 2.0 per second, and the vibration of the sample stage is measured with a vibration sensor. It is a parameter that is affected by "smoothness and roughness". Therefore, if the ratio (S1 / S2) of the TS750 value (S1) of the roll outer surface side 31 of the two-ply toilet paper 10 to the TS750 value (S2) of the roll inner surface side 32 is 0.9 to 1.2, the front and back surfaces have the same smoothness, and the user can evaluate that there is no or little feeling of use on the front and back surfaces. In addition, when the two-ply toilet paper 10 is used, the surface that touches the skin of the sheet 11 on the roll outer surface side 31 and the sheet 12 on the roll inner surface side 32 is the laminated outer surface side 33, 35. Therefore, when the ratio A (S3 / S4) is 1 or less and the ratio B (S5 / S6) is 1 or less, the laminated outer surface sides 33, 35, which are the surfaces that come into contact with the skin of the sheet 11 on the outer surface side 31 of the roll and the sheet 12 on the inner surface side 32 of the roll, are superior in smoothness to or equivalent to the laminated inner surface sides 34, 36 that do not come into contact with the skin. Therefore, in this preferred embodiment of the toilet paper 10, there is little or no difference in smoothness between the front and back of the two-ply toilet paper 10, and the surfaces that come into contact with the skin of both the sheet 11 on the outer surface side 31 of the roll and the sheet 12 on the inner surface side 32 of the roll are smooth. Furthermore, when the ratio (A / B) of ratio A to ratio B is 0.8 to 1.2, coupled with the fact that the above ratio A (S3 / S4) and ratio B (S5 / S6) are both 1 or less, the laminated outer surface sides 33, 35 of both the sheet 11 on the outer surface side 31 of the roll and the sheet 12 on the inner surface side 32 of the roll that come into contact with the skin are smooth, and it can be said that the difference in smoothness between the sheet 11 on the outer surface side 31 of the roll and the sheet 12 on the inner surface side 32 of the roll is small.

[0033] Here, TS750, like TS7, depends on the stiffness of the individual fibers constituting the toilet paper 10, such as the softness and hardness, the coarseness and density of the fibers in the sample, the bond strength between the fibers, the micro- and macro-compressibility, and added chemicals (softeners, starch, dry strength agents), etc. Therefore, in order to make the ratio (S1 / S2) of the TS750 value (S1) of the outer side 31 of the roll of the toilet paper 10 to the TS750 value (S2) of the inner side 32 of the roll be 0.9 to 1.2 as described above, the sheet 11 constituting the outer side 31 of the roll and the sheet 12 constituting the inner side 32 of the roll have the same fiber raw material, fiber basis weight, beating degree, added chemicals, calendar conditions, paper thickness, papermaking conditions, etc. as a standard, and from that standard, the tension difference at the inner side position and the outer side position when winding during manufacturing and the difference in the transport rolls that contact each sheet in the transport path are taken into consideration, and adjustments are made appropriately. Furthermore, it is preferable to adjust the configuration of the unevenness caused by the embossing so that it is similar between the sheet 11 constituting the roll outer surface side 31 and the sheet 12 constituting the roll inner surface side 32. To make the surfaces of the laminate outer surface sides 33, 35 that come into contact with the skin of the sheet 11 on the roll outer surface side 31 and the sheet 12 on the roll inner surface side 32 smooth, adjustments can be made, for example, in the same way as the adjustment of TS7, by adjusting the felt-like wet paper during papermaking, the blade angle of the Yankee dryer, the crepe rate, calendaring, and the like.

[0034] [HF] On the other hand, the toilet roll 1 of this embodiment has a TS7 value (T1) of 12 dBV on the roll outer surface side 31 of the two-ply toilet paper 10 measured by the above-mentioned tissue softness measuring device TSA. 2 It is desirable that the HF value (H1) of the outer side 31 of the roll of the 2-ply toilet paper 10 to the HF value (H2) of the inner side 32 of the roll is 0.9 to 1.1, that the ratio (H1 / H2) of the HF value (H3) of the laminate outer side 33 of the sheet 11 on the outer side 31 of the roll to the HF value (H4) of the laminate inner side 34 of the roll is 1 or more, and further, that the ratio B (H5 / H6) of the HF value (H5) of the laminate outer side 35 of the sheet 12 on the inner side 32 of the roll to the HF value (H6) of the laminate inner side 36 of the roll is 1 or more.

[0035] As described above, the TS7 value (T1) of the outer surface side 31 of the roll of the two-ply toilet paper 10 is 12 dBV. 2 If it is below rms, the toilet paper 10 can be rated as excellent in softness.

[0036] On the other hand, the HF (hand feel) value measured by the tissue softness measuring device TSA is the HF (hand feel) value calculated by a nonlinear algorithm from the above-mentioned TS7 value, TS750 value, D value, paper thickness, basis weight, number of plies, etc., and can be used for comprehensive quantitative evaluation of the touch feeling correlated with the result of human touch feeling (panel test). The algorithm for the HF value according to the present invention and this embodiment is TPII. The specific numerical value of the HF (hand feel) value is not limited. The higher the HF (hand feel) value, the better it is. When the ratio (H1 / H2) of the HF value (H1) of the roll outer surface side 31 of the 2-ply toilet paper 10 to the HF value (H2) of the roll inner surface side 32 is 0.9 to 1.1, it can be said that there is no difference or a small difference in the touch felt by humans on the front and back surfaces of the toilet paper 10.

[0037] Furthermore, when the two-ply toilet paper 10 is used as described above, the surfaces of the sheet 11 on the outer side 31 of the roll and the sheet 12 on the inner side 32 of the roll that come into contact with the skin are the laminated outer sides 33, 35. Therefore, if the ratio (H3 / H4) of the HF value (H3) of the laminated outer side 33 of the sheet 11 on the outer side 31 of the roll to the HF value (H4) of the laminated inner side 34 is 1 or more, and further, the ratio B (H5 / H6) of the HF value (H5) of the laminated outer side 35 of the sheet 12 on the inner side 32 of the roll to the HF value (H6) of the laminated inner side 36 of the sheet 11 on the outer side 31 of the roll and the sheet 12 on the inner side 32 of the roll, the laminated outer sides 33, 35 that come into contact with the skin in the sheet 11 on the outer side 31 of the roll and the sheet 12 on the inner side 32 of the roll are superior in terms of feel to the skin to the laminated inner sides 34, 36 that do not come into contact with the skin. Therefore, when combined with the ratio (H1 / H2) of the HF value (H1) of the outer side 31 of the roll of the toilet paper 10 to the HF value (H2) of the inner side 32 of the roll, the difference in feel between the front and back of the two-ply toilet paper 10 is small, and the sheet 11 of the outer side 31 of the roll and the sheet 12 of the inner side 32 of the roll both have a pleasant feel on the surface that comes into contact with the skin. Here, the HF of the toilet paper 10 and each sheet 11, 12 is determined by the parameters TS750, TS7, and D, as described above, so that the HF value can be adjusted to the above range by adjusting the parameters TS750, TS7, and D.

[0038] The HF (H1) value of the roll outer side 31 of the 2-ply toilet paper 10 is parameterized as the TS750 value (S1), the TS7 value (T1), and the D value (D1) of the roll outer side 31 of the 2-ply toilet paper 10. The HF (HF2) value of the roll inner side 32 of the 2-ply toilet paper 10 is parameterized as the TS750 value (S2), the TS7 value (T2), and the D value (D2) of the roll inner side 32 of the 2-ply toilet paper 10. The HF value (H3) of the laminated outer side 33 of the sheet 11 on the roll outer side 31 is parameterized as the TS750 value (S3), the TS7 value (T3), and the D value (D3) of the laminated outer side 33 of the sheet 11 on the roll outer side 31. The HF value (H4) of the lamination inner surface side 34 of the sheet 11 on the roll outer surface side 31 has as parameters the TS750 value (S4), the TS7 value (T4), and the D value (D4) of the lamination inner surface side 34 of the sheet 11 on the roll outer surface side 31. The HF value (H5) of the lamination outer surface side 35 of the sheet 12 on the roll inner surface side 32 has as parameters the TS750 value (S5), the TS7 value (T5), and the D value (D5) of the lamination outer surface side 35 of the sheet 12 on the roll inner surface side 32. The HF value (H6) of the lamination inner surface side 36 of the sheet 12 on the roll inner surface side 32 has as parameters the TS750 value (S6), the TS7 value (T6), and the D value (D6) of the lamination inner surface side 36 of the sheet 12 on the roll inner surface side 32.

[0039] [Emboss] On the other hand, in the toilet paper 10 of the toilet roll 1 of this embodiment, the sheets 11 and 12 have unevenness due to embossing as described above. The form of embossing by embossing can be a single embossing form in which a concave portion is formed on one side of the two-ply toilet paper 10, and a convex portion corresponding to the concave portion is formed on the other side, which is not necessarily limited. Also, a double embossing form can be formed in which unevenness is separately imparted to the sheets 11 and 12 by embossing, and then the sheets 11 and 12 are laminated together. However, in the single embossing form, since a concave portion is formed on one side of the toilet paper and a convex portion is formed on the other side, even if the physical property values ​​of each sheet are adjusted to be the same, a difference in the surface properties of the front and back sides is likely to occur, making it difficult to adjust to the range of values ​​according to this embodiment. Therefore, a double embossing form is preferable. More preferably, a double embossing form is used in which each sheet 11 and 12 has unevenness in the same pattern. The difference in surface properties of the front and back sides is reduced. Furthermore, even in the double embossed form, a particularly preferred form is a two-ply double embossed form in which the shape, area, and arrangement of the recesses of each sheet 11, 12 are the same, and further, the sheets 11, 12 are laminated such that the surfaces on which the recesses are formed are the laminated outer surfaces, with the recesses being formed by embossing on one side and the protrusions corresponding to the recesses on the other side. In this double embossed form of toilet paper 10, the recesses are present on the roll outer surface side 31 and the roll inner surface side 32, i.e., on the front and back sides during use, and the protrusions are not present. Therefore, the difference in texture between the front and back sides of the toilet paper 10 is small or no, and the toilet paper is excellent in terms of softness to the touch. It is preferable that the embossing is performed using a steel rubber method. It is also preferable that, in the double embossed form, the sheets are not bonded to each other by an adhesive or the like.

[0040] On the other hand, the embossing pattern of the recesses or protrusions in the toilet paper 10 of this embodiment is not necessarily limited. The shape and area of ​​the recesses are not necessarily limited. Furthermore, the area and shape of the non-recessed areas surrounded by the recesses are not necessarily limited. The preferred embossing density is 5 to 50 embossments / cm. 2 As a preferred embodiment of the embossing pattern, as shown in FIG. 3, the recesses 50 are regularly positioned at the intersections of a virtual diagonal lattice. Particularly preferred is an embossing pattern in which the recesses 50 are in a quadrangular shape with the four corners extending outward from the diagonal 50d, and other recesses 50 are positioned in the direction of the diagonal 50d. The intersection angle ∠α of the diagonal 50d of the recess 50 is 80 to 100 degrees, preferably 90 degrees. In addition, it is preferable that the length of the diagonal 50d is substantially the same, and further, it is preferable that the portion extending outward from the end of the diagonal 50d is gradually shallower toward the tip. The interval between the recesses 50 is not necessarily limited, but it is preferable that the planar shape of the non-recessed portion 51 between the recesses 50 is a circle or a rounded rectangle as shown in the figure. This embossed pattern of the arrangement of recesses 50 has excellent design properties, and particularly when it is in the preferred double embossed form in which only recesses 50 are present on the front and back surfaces, it has excellent cushioning properties that can be evaluated in terms of the sensory properties when actually used, and is easy to measure as various parameters using the tissue softness measuring device TSA described above.

[0041] On the other hand, another preferred embodiment of the embossing pattern of the present invention is an embossing pattern in which the recesses 50 are not arranged linearly along the paper flow direction MD, but are arranged linearly along a predetermined direction (X direction in the figure) at a predetermined interval L4, and the angle ∠β between the predetermined direction X and the paper flow direction MD is 0 to 45 degrees, preferably 10 to 45 degrees, and particularly preferably 20 to 35 degrees, as shown in Figs. 4 and 5. The paper flow direction is the length of the paper, also called the MD direction, and is the flow direction during papermaking. In the toilet roll 1, the direction in which the toilet paper 10 is pulled out is the paper flow direction MD. With this embossing pattern, fine wrinkles along the paper flow direction are less likely to occur during the log winding process during production, and the surface properties of the toilet paper 10 and the sheets 11 and 12 are improved. This makes it easier to achieve the desired TS750, TS7, and D measured by the tissue softness measuring device TSA described above. Furthermore, in the case of this embossing pattern, it is preferable that the recesses have a shape that has no sides perpendicular to or parallel to the paper flow direction.

[0042] Sheet On the other hand, the sheets 11 and 12 constituting the toilet paper 10 of this embodiment are crepe papers formed by wet-laid papermaking of fiber raw materials. In particular, dry-crepe is preferably formed. The crepe ratio is not particularly limited.

[0043] The type of pulp that is the main raw material of the sheets 11 and 12 is not particularly limited. A suitable ratio of NBKP (softwood kraft pulp) and LBKP (hardwood kraft pulp) is preferably used. Recycled paper pulp may also be used. The recycled paper pulp is preferably milk carton recycled paper. Furthermore, from the viewpoint of the texture of the resulting toilet paper 10, it is preferable that the sheets are composed only of virgin pulp NBKP and LBKP. In this case, the ratio (JIS P 8120) is preferably NBKP:LBKP=20:80 to 80:20, and particularly preferably NBKP:LBKP=30:70 to 60:40.

[0044] The content of the dry strength agent is not necessarily limited, but is preferably 0.001 to 0.15% by mass. This dry strength agent is preferably added internally. The type of dry strength agent is not necessarily limited, but examples thereof include polyacrylamide, CMC (carboxymethylcellulose) or its salts, such as sodium carboxymethylcellulose, calcium carboxymethylcellulose, and zinc carboxymethylcellulose. EXAMPLES

[0045] Next, examples of the present invention and comparative examples will be described. Samples (Examples) relating to the toilet roll according to the present invention and samples (Comparative Examples) relating to other toilet rolls were prepared, and sensory evaluation tests were conducted on "difference in smoothness between the front and back", "difference in softness between the front and back", and "difference in stiffness between the front and back". The test was conducted by 20 subjects who touched the two-ply sample toilet paper with their hands and evaluated whether there was a difference between the front and back in terms of smoothness, softness, and stiffness on a 5-point scale: 5: Yes, I think so, 4: I think so to some extent, 3: I can't say either way, 2: I don't think so, and 1: I don't think so. The physical properties and results for each example are as shown in Table 1. The sensory evaluation values ​​in the table are average values ​​rounded off. Regarding the embossing in the examples and comparative examples, the embossing in Example 1 was in the form shown in Fig. 5, with an angle ∠β between the line-up direction of the recesses and the flow direction being 30 degrees, while the embossing in Examples 2 to 4 was in the form shown in Fig. 5, with an angle ∠β with respect to the flow direction being 0 degrees. In Comparative Examples 1 to 3, the shape of the embossed recesses was round.

[0046] [Table 1] As shown in Table 1, Examples 1 to 4 according to the present invention were evaluated as having small differences in the actual sensory sensations of "difference in smoothness between the front and back," "difference in softness between the front and back," and "difference in rigidity between the front and back." Comparative Examples 1 to 3 tended to receive lower scores than the Examples in the sensory evaluation. By using the toilet roll according to the present invention, the toilet roll was evaluated as having no or small difference in the sensation of use between the front and back of the pulled-out toilet paper. [Explanation of symbols]

[0047] 1...toilet roll, 10...toilet paper, 11...sheet on outer side of roll, 12...sheet on inner side of roll, 20...paper tube, 31...outer side of roll, 32...inner side of roll, 33...outer side of stack of sheets on outer side of roll, 34...inner side of stack of sheets on outer side of roll, 35...outer side of stack of sheets on inner side of roll, 36...inner side of stack of sheets on inner side of roll, 50...recess, 50d...diagonal, 51...non-recess, L1...winding diameter, L2...outer diameter of paper tube, L3...width of toilet roll, L4...spacing of recesses, X...direction in which recesses are arranged, ∠α...intersecting angle of diagonal of recesses, ∠β...angle between direction in which recesses are arranged and flow direction of paper.

Claims

1. A toilet roll having two sheets of toilet paper laminated together, The winding diameter is 104.5 to 130 mm, and the winding length is 45 to 106 m, The sheet has a concave and convex shape due to embossing, and has a basis weight of 11 to 18 g / m ２ The toilet paper has a thickness of 75 to 130 μm, and The ratio (T1 / T2) of the TS7 value (T1) on the outer side of the roll to the TS7 value (T2) on the inner side of the roll of the two-ply toilet paper, as measured by a tissue softness measuring device (TSA), is 0.8 to 1.2; the ratio P(T3 / T4) of the TS7 value (T3) on the outer layer side of the sheet on the outer side of the roll to the TS7 value (T4) on the inner layer side of the sheet, as measured by a tissue softness measuring device TSA, is 1 or less; the ratio Q (T5 / T6) of the TS7 value (T5) on the outer surface side of the laminate of the sheet on the inner surface of the roll to the TS7 value (T6) on the inner surface side of the laminate, as measured by a tissue softness measuring device TSA, is 1 or less; The ratio (P / Q) of the ratio P to the ratio Q is 0.8 to 1.2; A toilet roll characterized by:

2. The toilet roll according to claim 1, wherein the ratio (D3 / D5) of the D value (D5) of the laminated outer surface side of the sheet on the outer side of the roll to the D value (D3) of the laminated outer surface side of the sheet on the inner side of the roll, measured by a tissue softness measuring device TSA, is 0.9 to 1.

1.

3. The TS7 value (T1) of the outer surface side of the roll of two-ply toilet paper measured by the tissue softness measuring device TSA is 12 dBV. ２ is less than or equal to the rms The ratio (H1 / H2) of the HF value (H1) on the outer side of the roll to the HF value (H2) on the inner side of the roll of the two-ply toilet paper, as measured by a tissue softness measuring device (TSA), is 0.9 to 1.1; the ratio (H3 / H4) of the HF value (H3) of the outer laminated surface side of the sheet on the outer surface side of the roll to the HF value (H4) of the inner laminated surface side of the sheet on the outer surface side of the roll, as measured by a tissue softness measuring device (TSA), is 1 or more; The ratio B (H5 / H6) of the HF value (H5) on the outer surface side of the laminate of the sheet on the inner surface of the roll to the HF value (H6) on the inner surface side of the laminate, as measured by a tissue softness measuring device (TSA), is 1 or more. The toilet roll according to claim 1 or 2.

4. 2. The toilet roll according to claim 1, wherein the toilet paper is a two-ply double embossed toilet paper in which sheets each having a concave portion on one side and a convex portion corresponding to the concave portion on the other side are laminated together so that the surfaces on which the concave portions are formed are the outer surfaces.

5. The toilet roll according to claim 1 or 4, wherein the embossed pattern of the recesses is such that the recesses are linearly arranged at predetermined intervals along a predetermined direction, and the angle between the predetermined direction and the paper flow direction is 0 to 45 degrees.

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