toilet paper

Abstract

To provide toilet tissue paper combining characteristics of soft touch and robustness at a wet time, with characteristics of hardly jamming upon flushing.SOLUTION: A one-ply toilet tissue paper having a first surface and a second surface on the opposite side to the first surface is provided in which a mean value of a hand feel value on the first surface and a hand feel value on the second surface is 65.0 or more, a wet burst strength of the toilet tissue paper is 150 kPa or higher, and water solubility of the toilet tissue paper is 40 seconds or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a single-ply toilet paper. [Background technology]

[0002] Roll or sheet toilet paper products are manufactured by cutting toilet paper made by plying one or more layers of toilet paper web to a specified size. Generally, roll toilet paper made by winding a long piece of toilet paper into a roll is widely used. Toilet paper made from a single layer of toilet paper web is called 1-ply toilet paper, and toilet paper made from two layers of toilet paper web is called 2-ply toilet paper.

[0003] Because roll toilet paper is unwound from a roll and used, it is required to have a certain degree of tensile strength when in use. Furthermore, toilet paper is wet when in use, and is required to have a certain degree of durability even in that state. On the other hand, because toilet paper comes into direct contact with the skin, it is required to be not only strong but also soft to the touch. Previously, in order to achieve strength and a good feel, efforts have been made to adjust the basis weight and thickness of toilet paper to an appropriate range (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-209150 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-217004 Summary of the Invention [Problem to be solved by the invention]

[0005] However, none of the toilet papers disclosed in Patent Documents 1 and 2 combine durability in a wet state with a soft feel, and further improvements are needed. Furthermore, in recent years, efforts have been made to conserve water in flush toilets, and in particular in water-saving flush toilets, it has become important to prevent toilet paper clogging during flushing.

[0006] Therefore, in order to solve these problems of the conventional technology, the inventors have conducted research with the aim of providing toilet paper that is soft to the touch, durable when wet, and less likely to clog during flushing. [Means for solving the problem]

[0007] As a result of intensive research to solve the above problems, the inventors have discovered that by adjusting specific physical property values ​​of toilet paper to fall within a predetermined range, it is possible to obtain toilet paper that is soft to the touch, durable when wet, and less likely to clog when flushed. Specifically, the present invention has the following configuration.

[0008] [1] A one-ply toilet paper having a first surface and a second surface opposite to the first surface, The average of the hand feel value of the first side and the hand feel value of the second side is 65.0 or more, The wet burst strength of the toilet paper is 150 kPa or more, This toilet paper has a water-decomposability of 40 seconds or less. [2] The thickness of one sheet of toilet paper is between 60 μm and 120 μm, The toilet paper according to [1], wherein the thickness when measured by stacking 10 sheets of toilet paper is 400 μm or more and 1200 μm or less. [3] The toilet paper according to [1] or [2], where the thickness of one sheet of toilet paper is A μm and the thickness measured when 10 sheets of toilet paper are stacked is B μm, and the ratio A / B is 0.150 ≧ A / B ≧ 0.100. [4] The specific volume of one sheet of toilet paper is 2.50 cm 3 / g or more 7.00cm 3 / g or less, The specific volume of 10 sheets of toilet paper stacked together is 1.66 cm 3 / g or more 7.00cm 3 / g or less. [5] The specific volume of one sheet of toilet paper is Ccm 3 / g, and the specific volume when measuring 10 sheets of toilet paper stacked together is Dcm 3 / g, 1.50≧C / D≧1.00. [6] The toilet paper according to any one of [1] to [5], which is an embossed toilet paper. [Effects of the Invention]

[0009] According to the present invention, toilet paper can be obtained that has the properties of being soft to the touch, being strong when wet, and not easily clogging when flushing. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram illustrating the configuration of the toilet paper of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described in detail below. The following description of the components may be based on representative embodiments and specific examples, but the present invention is not limited to such embodiments.

[0012] (toilet paper) The present invention relates to a single-ply toilet paper having a first side and a second side opposite to the first side. The average hand feel value of the first side and the second side of the toilet paper of the present invention is 65.0 or more, and the wet burst strength of the toilet paper of the present invention is 150 kPa or more. In addition, the water disintegration property of the toilet paper of the present invention is 40 seconds or less.

[0013] Because the toilet paper of the present invention has the above-mentioned configuration, it exhibits sufficient strength when wet while also having a soft feel. Furthermore, the toilet paper of the present invention also has the property of being less likely to clog during flushing. In this way, the toilet paper of the present invention combines two properties that are difficult to achieve together: strength when wet and a soft feel, and combines both practical durability during use and an excellent feel. Furthermore, the present invention simultaneously solves the problem of toilet paper clogging during flushing. The toilet paper of the present invention is also suitable for use in water-saving toilets.

[0014] The toilet paper of the present invention is a single-ply toilet paper. Single-ply toilet paper is toilet paper made up of a single sheet of toilet paper web.

[0015] The toilet paper of the present invention is preferably a roll of toilet paper, and such a roll of toilet paper is sometimes called a toilet roll. Here, the first side of the roll of toilet paper refers to the side that is disposed on the outer circumferential surface of the roll when the toilet paper is wound into a roll. Furthermore, the second side of the toilet paper refers to the side that is disposed on the inner circumferential surface of the roll when the toilet paper is wound into a roll. Figure 1 is a diagram illustrating the configuration of the toilet paper of the present invention. The roll-shaped toilet paper 10 has an outer peripheral surface P and an inner peripheral surface Q. Figure 1(b) is an enlarged view of the configuration of the part surrounded by the dotted line in Figure 1(a). Figure 1(b) shows the configuration of the toilet paper web 1, with the surface arranged on the outer peripheral surface being the first surface 2 and the surface arranged on the inner peripheral surface being the second surface 4.

[0016] The average hand feel value (hereinafter also referred to as HF value) of the first side of the toilet paper of the present invention and the hand feel value of the second side may be 65.0 or higher, preferably 70.0 or higher, more preferably 73.0 or higher, even more preferably 74.0 or higher, and particularly preferably 75.0 or higher. The HF value is an index that indicates elements of softness and smoothness. The present invention has discovered an HF value that is particularly suitable for single-ply toilet paper, and by simultaneously satisfying other conditions, has succeeded in developing toilet paper that combines practical durability during use, excellent tactile feel, and high flushing functionality, such as resistance to clogging during flushing. In particular, by setting the HF value at or above the above lower limit, it is possible to achieve both the softness of the toilet paper and the resistance to clogging during flushing.

[0017] Here, the hand feel value (HF value) can be measured using a tissue softness analyzer (manufactured by Emtec Electronic GmbH) by the following measurement method. First, a sample cut into a circle with a diameter of 112.8 mm is placed on the sample stage of the tissue softness analyzer. The bladed rotor is pressed against the sample from above with a pressure of 100 mN. The bladed rotor is then rotated at a speed of 2.0 revolutions per second, and the vibration frequency at that time is measured. Additionally, the vertical deformation displacement amount was calculated for another sample cut into a circle with a diameter of 112.8 mm when a bladed rotor was pressed into it with pressures of 100 mN and 600 mN. The HF value is calculated from the vibration frequency and the deformation displacement amount, and the calculation algorithm can use TP II. When calculating the HF value, measurements are performed 10 times for each of the first surface (outer surface) and the second surface (inner surface) of each sample, and the average values ​​are calculated for each of the first and second surfaces. From the two average values ​​thus calculated, the average HF value is calculated, and this is the HF value in the present invention. The above samples are measured in an environment that complies with ISO187 (temperature 23±1°C, relative humidity 50±2%). When measuring, the instrument is calibrated with a standard sample (emetec ref.2X(nn.n)) according to the attached instructions, and the algorithm is set to TP II. The calculation software used is emetec measurement system ver.3.22.

[0018] The wet burst strength of the toilet paper of the present invention may be 150 kPa or more, preferably 160 kPa or more, more preferably 180 kPa or more, even more preferably 190 kPa or more, and particularly preferably 200 kPa or more. Furthermore, the wet burst strength is preferably 500 kPa or less, more preferably 450 kPa or less, even more preferably 400 kPa or less, and particularly preferably 350 kPa or less. By setting the wet burst strength of the toilet paper within the above range, the toilet paper can more effectively exhibit its toughness in a wet state and prevent clogging during flushing. Furthermore, by setting the wet burst strength of the toilet paper to 150 kPa or more and less than 200 kPa, it is also possible to more effectively increase the ease with which the toilet paper unravels during flushing.

[0019] If the moisture content (%) of the toilet paper of the present invention is x and the wet burst strength (kPa) of the toilet paper is y, then it is preferable that y≦-8.0x+1910, more preferably y≦-7.0x+1690, and even more preferably y≦-6.0x+1470. Furthermore, y may be 150 or more, preferably 160 or more, more preferably 180 or more, even more preferably 190 or more, and particularly preferably 200 or more. Here, x is 170 or more and 200 or less. In this way, it is preferable that the moisture content and wet burst strength of the toilet paper meet certain conditions, which makes it easier to achieve the properties of being soft to the touch and not clogging easily when flushed, while still exhibiting sufficient strength when wet. Here, the wet burst strength of toilet paper is measured as follows. First, toilet paper was cut into 5 x 5 cm pieces, and 60 sheets were stacked to prepare a test specimen, which was then weighed. The test specimen was then immersed in pure water at 23°C, after which excess water was removed using filter paper (Toyo Roshi Kaisha, Ltd., Standard Filter Paper No. 26), and the weight was measured again. After the 60-ply test specimen was removed from the pure water, it was confirmed to be free of tears or other damage. Several sheets of filter paper were then placed on top and bottom of the specimen, and the specimen was pressed vertically to ensure uniform dehydration. The vertical pressing process was sufficient to ensure uniform dehydration from the specimen, and it could be adjusted appropriately to ensure the moisture content of the specimen was between 170% and 200%. After confirming that the moisture content of the test specimen after pressing was between 170% and 200%, the burst strength (kPa) was measured using a low-pressure burst tester (Kumagaya Riki Kogyo Co., Ltd., 2021-C). The average of six measurements was calculated as the wet burst strength. The wet burst strength is measured in an environment conforming to ISO187 (temperature 23±1°C, relative humidity 50±2%). The moisture content of toilet paper is calculated using the following formula. Moisture content (%) = (difference in test piece weight before and after immersion) x 100 / test piece weight before immersion

[0020] The water disintegrability of the toilet paper of the present invention may be 40 seconds or less, preferably 35 seconds or less, more preferably 30 seconds or less, even more preferably 25 seconds or less, and particularly preferably 20 seconds or less. By keeping the water disintegrability of the toilet paper within the above range, it is possible to prevent paper clogging in the drain of a flush toilet, etc. The water-disintegrability of the toilet paper in this specification is measured in accordance with JIS P 4501 and is the average value of five measurements. The toilet paper of the present invention has excellent strength in a wet state and also has excellent water-disintegrability.

[0021] The thickness of a single sheet of toilet paper of the present invention is preferably 60 μm or more, more preferably 75 μm or more, even more preferably 80 μm or more, and particularly preferably 90 μm or more. Furthermore, the thickness of a single sheet of toilet paper is preferably 140 μm or less, and more preferably 120 μm or less. In particular, the thickness of a single sheet of toilet paper is preferably 60 μm or more and 120 μm or less, and more preferably 75 μm or more and 120 μm or less.

[0022] When 10 sheets of the toilet paper of the present invention are stacked and measured, the thickness is preferably 400 μm or more, more preferably 600 μm or more, even more preferably 700 μm or more, and particularly preferably 800 μm or more. Furthermore, when 10 sheets of the toilet paper are stacked and measured, the thickness is preferably 1400 μm or less, more preferably 1200 μm or less, and even more preferably 1100 μm or less. In particular, when 10 sheets of the toilet paper are stacked and measured, the thickness is preferably 400 μm or more and 1200 μm or less, and more preferably 600 μm or more and 1200 μm or less.

[0023] Here, if the thickness of one sheet of toilet paper is A μm and the thickness measured when 10 sheets of toilet paper are stacked together is B μm, then it is preferable that A / B≧0.100, more preferably 0.150≧A / B≧0.100, and even more preferably 0.140≧A / B≧0.100. A / B≧0.100 means that the thickness measured when 10 sheets of toilet paper are stacked is less than or equal to 10 times the thickness of a single sheet of toilet paper. With ordinary toilet paper, the thickness measured when 10 sheets of toilet paper are stacked is expected to be greater than 10 times the thickness of a single sheet (calculated value) due to embossing or other uneven shapes. However, in the present invention, the thickness measured when 10 sheets of toilet paper are stacked is less than or equal to 10 times the thickness of a single sheet of toilet paper. This makes the toilet paper of the present invention more likely to form a compact shape when stacked. In other words, when using the toilet paper, the sheet that directly touches the skin has sufficient thickness, while the compact shape after use reduces the risk of the toilet paper clogging during flushing. Furthermore, in the toilet paper of the present invention, by setting the A / B value within a specified range, a soft feel is easily achieved.

[0024] The thickness of a single sheet of toilet paper is measured using a thickness gauge (manufactured by Hybridge Manufacturing Co., Ltd.) by lowering the probe onto the sample at a speed of 1 mm per second or less, and then reading the value after 10 seconds. The thickness of a single sheet of toilet paper is calculated as the average value of 8 samples. Paper thickness measurements are performed in an environment that complies with ISO187 (temperature 23±1°C, relative humidity 50±2%). The same measurement is also used to measure the thickness of 10 sheets of toilet paper stacked together. Specifically, 10 sheets of toilet paper are stacked together, and a thickness gauge (manufactured by Hybridge Manufacturing Co., Ltd.) is used to lower the probe onto the sample at a speed of 1 mm per second or less, and the value is read after 10 seconds. The thickness of the 10 sheets is measured at 8 points on the 10-sheet sample, and the average value is calculated.

[0025] The basis weight of the toilet paper of the present invention is 17.0 g / m 2 It is preferable that the content is 18.0 g / m or more. 2 More preferably, it is 19.0 g / m or more. 2 More preferably, it is 20.0 g / m or more. 2 It is particularly preferable that the basis weight of the toilet paper of the present invention is 26.0 g / m or more. 2 Preferably, it is 25.0 g / m or less. 2 More preferably, it is 24.0 g / m or less. 2 More preferably, it is 23.0 g / m or less. 2 It is particularly preferable that the following is true. By setting the basis weight and thickness of the toilet paper within the above ranges, it is possible to achieve a soft feel while maintaining practical strength in a wet state, and further to prevent clogging during flushing. The basis weight of the toilet paper is measured in accordance with JIS P 8124.

[0026] The specific volume of one sheet of toilet paper of the present invention is 2.50 cm 3 / g or more, and 3.00 cm 3 / g or more is more preferable, and 4.00 cm 3 / g or more. The specific volume of one sheet of the toilet paper of the present invention is more preferably 7.00 cm 3 / g or less, and 3 / g or less is more preferable, and 5.50 cm 3 It is more preferable that the saturation coefficient is 1 / g or less. The specific volume of 10 sheets of toilet paper of the present invention is 1.66 cm 3 / g or more, and 2.00 cm 3 / g or more is more preferable, and 2.66 cm 3 / g or more. In addition, the specific volume of 10 sheets of the toilet paper of the present invention is 7.00 cm 3 / g or less, and3 / g or less is more preferable, and 5.50 cm 3 It is more preferable that the saturation coefficient is 1 / g or less. The specific volume of one sheet of toilet paper is calculated using the following formula. Specific volume of one sheet (cm 3 / g) = Thickness of one sheet (μm) / Basis weight of one sheet (g / m 2 ) The specific volume of 10 sheets of toilet paper is calculated using the following formula: Specific volume of 10 sheets (cm 3 / g) = 10 sheets of paper thickness (μm) / 10 sheets of basis weight (g / m 2 ) Here, the basis weight (g / m) of 10 sheets of toilet paper 2 ) is the basis weight (g / m2) of one sheet of toilet paper. 2 ) multiplied by 10, which refers to the basis weight of 10 sheets.

[0027] The density of the toilet paper of the present invention is 0.14 g / cm 3 It is preferable that the concentration is 0.15 g / cm or more. 3 More preferably, it is 0.18 g / cm or more. 3 It is more preferable that the density of the toilet paper of the present invention is 0.40 g / cm or more. 3 Preferably, it is 0.33 g / cm or less. 3 More preferably, it is 0.25 g / cm or less. 3 It is even more preferable that: The density of 10 sheets of toilet paper of the present invention is 0.15 g / cm 3 It is preferable that the concentration is 0.20 g / cm or more. 3 More preferably, it is 0.25 g / cm or more. 3 It is more preferable that the density of the toilet paper of the present invention is 0.40 g / cm or more. 3 Preferably, it is 0.32 g / cm or less. 3 More preferably, it is 0.30 g / cm or less. 3 It is even more preferable that: The density of one sheet of toilet paper is calculated using the following formula: Density of one sheet (g / cm 3 ) = basis weight of one sheet (g / m 2 ) / Thickness of one sheet of paper (μm) The density of 10 sheets of toilet paper is calculated using the following formula: Density of 10 sheets (g / cm 3 ) = basis weight of 10 sheets (g / m 2 ) / 10 sheets of paper thickness (μm) By setting the specific volume and density of the toilet paper within the above ranges, it is possible to achieve a soft feel while maintaining practical strength in a wet state, and to prevent clogging during flushing. Conventionally, in the case of single-ply toilet paper, increasing the specific volume and decreasing the density of the toilet paper has been considered in order to give it a sense of volume. However, increasing the specific volume and decreasing the density of the toilet paper can cause clogging during flushing. Therefore, in the present invention, by adjusting the specific volume and density of the toilet paper within the above ranges, it is easier to achieve both an increased sense of volume when using the toilet paper and the property of being less likely to clog during flushing.

[0028] In the present invention, the specific volume of one sheet of toilet paper is defined as Ccm 3 / g, and the specific volume when measuring 10 sheets of toilet paper stacked together is Dcm 3 / g, it is preferable that C / D≧1.00, more preferably 1.50≧C / D≧1.00, and even more preferably 1.40≧C / D≧1.00. C / D≧1.00 means that the specific volume when measuring 10 sheets of toilet paper stacked together is less than the specific volume of a single sheet of toilet paper. This makes the toilet paper of the present invention more likely to form a compact shape when stacked. In other words, when using the toilet paper, each sheet that comes into direct contact with the skin has sufficient volume, but after use, it has a compact shape, reducing the risk of the toilet paper clogging during flushing. Furthermore, in the toilet paper of the present invention, by setting the C / D value within a specified range, it is more likely to exhibit a soft feel.

[0029] The wet tensile strength in the longitudinal direction of the toilet paper of the present invention is preferably 0.30 N / 15 mm or more, more preferably 0.35 N / 15 mm or more, and even more preferably 0.40 N / 15 mm or more. The wet tensile strength in the longitudinal direction of the toilet paper is preferably 1.00 N / 15 mm or less, more preferably 0.90 N / 15 mm or less, and even more preferably 0.80 N / 15 mm or less. Furthermore, the wet tensile strength in the width direction of the toilet paper of the present invention is preferably 0.18 N / 15 mm or more, more preferably 0.20 N / 15 mm or more, and even more preferably 0.22 N / 15 mm or more. The wet tensile strength in the width direction of the toilet paper is preferably 0.45 N / 15 mm or less, and more preferably 0.40 N / 15 mm or less. In the present invention, by setting the wet tensile strength value within the above range, it becomes easy to adjust the average HF value of the first and second sides of the toilet paper to the desired range, and it becomes easy to set the wet burst strength of the toilet paper to a predetermined value or more. Here, the wet tensile strength of toilet paper in this specification is a value obtained by stacking six sheets of toilet paper samples cut to a width of 15 mm and a span length of 100 mm, dropping 0.1 ml of water onto the center of the sample, and measuring the value one second later at a pulling speed of 50 mm / min, and calculating the average of 10 measurements. For measuring wet tensile strength, for example, a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.) can be used. The wet tensile strength measurement is performed in an environment conforming to ISO 187 (temperature 23±1°C, relative humidity 50±2%).

[0030] If the wet tensile strength (N / 15mm) in the length direction of the toilet paper of the present invention is Tw and the wet tensile strength (N / 15mm) in the width direction of the toilet paper is Yw, the geometric mean value of Tw and Yw is preferably 0.30N / 15mm or more, more preferably 0.35N / 15mm or more. Furthermore, the geometric mean value of Tw and Yw is preferably 0.70N / 15mm or less, more preferably 0.60N / 15mm or less.

[0031] If the wet tensile strength (N / 15mm) of the toilet paper in the length direction of the present invention is Tw and the wet tensile strength (N / 15mm) of the toilet paper in the width direction of the toilet paper is Yw, Tw / Yw is preferably 2.80 or less, more preferably 2.70 or less, and even more preferably 2.60 or less. Furthermore, Tw / Yw is preferably 1.20 or more, and more preferably 1.30 or more. In the present invention, by setting the Tw / Yw value within the above range, it becomes easy to adjust the average HF value of the first and second sides of the toilet paper to the desired range, and it becomes easy to set the wet burst strength of the toilet paper to a predetermined value or more.

[0032] The dry tensile strength in the length direction of the toilet paper of the present invention is preferably 0.80 N / 15 mm or more, more preferably 0.90 N / 15 mm or more, and even more preferably 0.95 N / 15 mm or more. The dry tensile strength in the length direction of the toilet paper is preferably 1.60 N / 15 mm or less, more preferably 1.50 N / 15 mm or less, and even more preferably 1.40 N / 15 mm or less. In addition, the dry tensile strength in the width direction of the toilet paper of the present invention is preferably 0.20 N / 15 mm or more, more preferably 0.25 N / 15 mm or more, and even more preferably 0.30 N / 15 mm or more. The dry tensile strength in the width direction of the toilet paper is preferably 0.60 N / 15 mm or less, and more preferably 0.50 N / 15 mm or less. In the present invention, by setting the dry tensile strength value within the above range, it becomes easy to adjust the average HF value of the first and second sides of the toilet paper to the desired range, and it becomes easy to set the wet burst strength of the toilet paper to a predetermined value or more. Here, the dry tensile strength of toilet paper in this specification is a value obtained by cutting a sample of toilet paper to a width of 15 mm and a span length of 100 mm, measuring it at a pulling speed of 50 mm / min, and calculating the average of six measurements. Dry tensile strength can be measured using, for example, a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.). Note that dry tensile strength is measured in an environment conforming to ISO187 (temperature 23±1°C, relative humidity 50±2%).

[0033] If the dry tensile strength (N / 15mm) in the length direction of the toilet paper of the present invention is Td and the dry tensile strength (N / 15mm) in the width direction of the toilet paper is Yd, the geometric mean value of Td and Yd is preferably 0.50 N / 15mm or more, more preferably 0.55 N / 15mm or more. Furthermore, the geometric mean value of Td and Yd is preferably 1.00 N / 15mm or less, more preferably 0.95 N / 15mm or less, and even more preferably 0.90 N / 15mm or less.

[0034] If the dry tensile strength (N / 15mm) of the toilet paper in the length direction of the present invention is Td and the dry tensile strength (N / 15mm) of the toilet paper in the width direction of the toilet paper is Yd, then Td / Yd is preferably 5.00 or less, more preferably 4.75 or less, and even more preferably 4.50 or less. Furthermore, Td / Yd is preferably 1.50 or more, and more preferably 2.00 or more. In the present invention, by setting the Td / Yd value within the above range, it becomes easy to adjust the average HF value of the first and second sides of the toilet paper to the desired range, and it becomes easy to set the wet burst strength of the toilet paper to a predetermined value or more.

[0035] The elongation percentage (%) in the length direction of the toilet paper of the present invention is preferably 8.0% or more, more preferably 10.0% or more, and even more preferably 12.0% or more. In addition, the elongation percentage (%) in the length direction of the toilet paper is preferably 22.0% or less, and more preferably 20.0% or less. The elongation percentage (%) of the toilet paper in the width direction is preferably 3.0% or more, more preferably 3.5% or more, and is preferably 10.0% or less, more preferably 8.0% or less. The elongation of toilet paper in this specification is the average value calculated by cutting a sample of toilet paper to a width of 15 mm and a span length of 100 mm, measuring it at a pulling speed of 50 mm / min, and calculating the value of six measurements. The elongation measurement is carried out in an environment conforming to ISO187 (temperature 23±1°C, relative humidity 50±2%). Then, the elongation rate (%) is calculated using the following formula. Elongation rate (%) = elongation amount of sample (mm) × 100 / span length (mm)

[0036] The toilet paper of the present invention is preferably embossed toilet paper. That is, the toilet paper is preferably embossed. This makes it easier to achieve the properties of soft touch and thickness of the toilet paper.

[0037] (Textile raw materials) The toilet paper of the present invention is obtained by papermaking a slurry containing a fiber raw material. Pulp is preferably used as the fiber raw material. Examples of pulp include wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp 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), and oxygen bleached kraft pulp (OKP). Other examples include semi-chemical pulps such as semi-chemical pulp (SCP) and chemi-ground wood pulp (CGP), groundwood pulp (GP), and mechanical pulps such as thermomechanical pulp (TMP, BCTMP), but are not limited thereto. Non-wood pulps include, but are not limited to, cotton pulps such as cotton linter and cotton lint, non-wood pulps such as hemp, straw and bagasse, and cellulose, chitin and chitosan isolated from sea squirts and seaweed, etc. Deinked pulps include deinked pulp made from recycled paper, but the above pulps may be used alone or in combination of two or more.

[0038] When softwood pulp is used as the fiber raw material, the softwood pulp content is preferably more than 20% by mass, more preferably 25% by mass or more, and even more preferably 30% by mass or more, based on the total mass of the pulp components contained in the toilet paper. Also, the softwood pulp content is preferably 80% by mass or less, more preferably 70% by mass or less, based on the total mass of the pulp components contained in the toilet paper.

[0039] It is preferable to use a combination of softwood pulp and hardwood pulp as the fiber raw material. That is, it is preferable that the toilet paper further contains hardwood pulp in addition to softwood pulp. The hardwood pulp content is preferably 20% by mass or more, and more preferably 30% by mass or more, of the total mass of the pulp components contained in the toilet paper. Furthermore, the hardwood pulp content is preferably 80% by mass or less, more preferably 75% by mass or less, and even more preferably 70% by mass or less, of the total mass of the pulp components contained in the toilet paper.

[0040] The length-weighted average fiber length of the softwood pulp used as the fiber raw material is preferably greater than 0.50 mm and is preferably 5.00 mm or less. The length-weighted average fiber length of the hardwood pulp used as the fiber raw material is preferably 0.50 mm or more and 2.00 mm or less. The length-weighted average fiber length of the fiber raw material is the fiber length as a raw material, and is the fiber length before being subjected to a beating treatment or the like.

[0041] The length-weighted average fiber length (disintegrated fiber length of the product) of the fiber components (pulp components) contained in the toilet paper is preferably 0.50 mm or more, and more preferably 0.60 mm or more. The length-weighted average fiber length (disintegrated fiber length of the product) of the fiber components (pulp components) is preferably 5.00 mm or less, more preferably 4.00 mm or less, even more preferably 3.00 mm or less, and even more preferably 2.00 mm or less. Here, the length-weighted average fiber length of the fiber components (pulp components) contained in the toilet paper is the fiber length of the fiber components obtained by defibrating the fiber components (pulp components) contained in the toilet paper, and is sometimes called the defibrated fiber length. When softwood pulp and hardwood pulp are used in combination as the fiber components (pulp components), the length-weighted average fiber length of the defibrated fiber length is calculated from the fiber lengths of both pulps. The defibrated fiber length is the fiber length calculated using the following measurement method. First, toilet paper is disintegrated in water to prepare a fiber-dispersed slurry. The fiber-dispersed slurry is obtained by adding 4 g of toilet paper to 200 ml of water, running a disintegrator at 4,500 rpm, and stirring until the paper is sufficiently disintegrated. The obtained fiber-dispersed slurry is diluted to 0.01% by mass or more and 0.02% by mass or less to prepare a diluted solution. The projected length of the fiber components contained in 10 ml of this diluted solution is measured using a fiber length measuring device (Kajaani Fiber Lab Ver. 4.0, manufactured by Metso Automation), and the length-weighted average value of the disintegrated fibers is calculated.

[0042] There are no particular upper or lower limits for the freeness of the fiber component (pulp component) contained in the toilet paper, but it is preferably 350 ml or more, more preferably 400 ml or more, and even more preferably 450 ml or more. In addition, the freeness is preferably 700 ml or less. Freeness is a value indicated by the Canadian Standard Freeness (CSF) specified in JIS P 8121, and indicates the degree of beating of fibers. Beating of fibers can be performed on a paper stock (slurry) in which fibers are dispersed using a known beating machine such as a beader or disc refiner. Usually, the smaller the freeness value of fibers, the stronger the degree of beating, and the greater the damage to fibers due to beating, resulting in the progress of fibrillation. As fiber fibrillation progresses, the number of bonding points between fibers increases, thereby improving strength. That is, in the present invention, freeness can be appropriately adjusted to set the dry tensile strength and wet tensile strength within preferred ranges.

[0043] (optional ingredient) The toilet paper of the present invention may contain optional ingredients in addition to the fiber raw materials. Examples of optional ingredients include dry strength agents, wet strength agents, and softeners. Examples of dry strength agents include cationized starch, polyacrylamide (PAM), and carboxymethyl cellulose (CMC). Examples of wet strength agents include polyamide epichlorohydrin, urea, melamine, and thermally crosslinkable polyacrylamide. Examples of softeners include anionic surfactants, nonionic surfactants, and cationic surfactants. The above optional ingredients may be used alone or in combination of two or more.

[0044] When the toilet paper contains a wet strength agent, the content of the wet strength agent is preferably 0.001 to 0.20 parts by mass per 100 parts by mass of the fiber components contained in the toilet paper. Furthermore, if the toilet paper contains a fabric softener, the content of the fabric softener is preferably 0.01 to 0.50 parts by mass per 100 parts by mass of the fiber components contained in the toilet paper. Furthermore, if the toilet paper contains a dry strength agent, the content of the dry strength agent is preferably 0.01 to 1.00 parts by mass per 100 parts by mass of the fiber components contained in the toilet paper. In the present invention, the additive chemicals can be appropriately adjusted to set the dry tensile strength and wet tensile strength within the preferred ranges.

[0045] (Toilet paper manufacturing method) The method for producing toilet paper of the present invention includes a step of making a slurry containing a fibrous raw material into a one-ply toilet paper web.

[0046] Before the step of making paper from the slurry, a step of bleaching the fiber raw material may be included. As the bleaching agent used in the bleaching step, known bleaching agents such as oxygen-based bleaching agents and chlorine-based bleaching agents can be used.

[0047] The process for obtaining one ply of toilet paper web includes a process for obtaining a slurry containing a fibrous raw material. The process for obtaining the slurry preferably includes a process for beating the fibrous raw material. In the beating process, for example, a double-disc refiner or the like can be used to perform a beating treatment. During the beating treatment, the softwood pulp and the hardwood pulp may be beaten separately, or they may be mixed and then beaten.

[0048] The process for obtaining one ply of toilet paper web includes a process for making a paper from a slurry containing a fibrous raw material. Examples of papermaking machines used in the papermaking process include suction breast formers (cylinder type, Fourdrinier type), twin wire formers, cylinder formers (C-wrap, S-wrap), and crescent formers.

[0049] In the papermaking process, it is preferable to adjust the ratio of the discharge water flow rate to the wire speed (jet wire ratio (J / W ratio)) so that Tw / Yw is 1.30 or more and 2.60 or less, where Tw is the wet tensile strength of the toilet paper in the length direction and Yw is the wet tensile strength in the width direction. The jet wire ratio is the ratio of the slurry supply rate to the wire running speed. When the jet wire ratio is greater than 1, the slurry supply rate is faster than the wire running speed, which is called "push formation." When the jet wire ratio is less than 1, the slurry supply rate is slower than the wire running speed, which is called "pull formation."

[0050] In the papermaking process, a slurry containing fibrous raw materials is fed onto a mesh wire to form a thin layer of pulp. The paper is then transported to the press part, where the water in the thin layer of pulp is extracted through the mesh, resulting in dewatering. This process is sometimes called the dewatering process. Generally, the wire is a ring of metal or plastic mesh.

[0051] After the dewatering process, the wet paper moves from the wire to a felt. The wet paper is further mechanically squeezed of water by pressure applied by a press roll through the felt. This is sometimes called the pressing process or the dewatering process.

[0052] In the papermaking process, for example, a method of making a pulp slurry that is a mixture of softwood pulp and hardwood pulp into a single uniform layer to form a wet paper, or a method of making a softwood pulp layer and a hardwood pulp layer together to form a single wet paper, and either method may be adopted.

[0053] The papermaking process includes a drying process after the water squeezing process. The drying process is preferably, for example, a process of blowing hot air toward the wet paper or a process of pressing the wet paper against the outer surface of a Yankee dryer. In the drying process using a Yankee dryer, it is preferable to perform a crepe treatment in which the dried paper is scraped from the Yankee dryer with a doctor blade to form crepe-like wrinkles. The crepe treatment can impart softness and volume to the toilet paper web (tissue paper).

[0054] A calendering step may be included after the drying step. Examples of calendering include calendering using two metal rolls, or soft calendering using two rolls, one of which is an elastic roll. When calendering is performed, the calender line pressure is preferably 0.1 kg / cm or more, more preferably 1.0 kg / cm or more, and even more preferably 2.0 kg / cm or more. Furthermore, the calender line pressure is preferably 13 kg / cm or less, more preferably 12 kg / cm or less, and even more preferably 11 kg / cm or less. By setting the line pressure within the above range, it becomes easy to adjust the toilet paper web to the desired thickness and softness.

[0055] After the calendering process, a base paper winding process is provided. In the base paper winding process, the toilet paper web (thin paper) finished through the above processes is wound up to obtain one ply of base paper roll. In this case, it is preferable to wind the toilet paper web (thin paper) so that the first side becomes the outer peripheral surface of the base paper roll.

[0056] A calendering step may also be included after the base paper winding step. In this case, the calendering can be performed while the wound toilet paper web is unwound once. Examples of calendering include calendering using two metal rolls, or soft calendering using two rolls, one of which is an elastic roll. When calendering is performed, the calender line pressure is preferably 0.1 kg / cm or more, more preferably 1.0 kg / cm or more, and even more preferably 2.0 kg / cm or more. Furthermore, the calender line pressure is preferably 13 kg / cm or less, more preferably 12 kg / cm or less, and even more preferably 11 kg / cm or less. By setting the line pressure within the above ranges, it becomes easy to adjust the toilet paper web to the desired thickness and softness.

[0057] The embossing is performed by applying pressure with an embossing roll having an embossing pattern. By changing the pressing amount or pressing pressure of the embossing roll, an embossed shape having a predetermined embossing height can be formed.

[0058] The embossing height on the toilet paper produced in the embossing process is preferably 60 μm or more, more preferably 70 μm or more, even more preferably 80 μm or more, even more preferably 90 μm or more, and particularly preferably 100 μm or more. The upper limit of the embossing height is not particularly limited, but can be, for example, 200 μm. By adjusting the embossing height within the above range, toilet paper having the desired thickness can be easily obtained. Furthermore, by adjusting the embossing height within the above range, softness and volume can be imparted to the toilet paper.

[0059] After the embossing process, a rewinding process is carried out. In this winding process, a predetermined length is wound up to meet the predetermined product length. The obtained roll is then cut to a predetermined width to obtain a toilet paper product. [Example]

[0060] The features of the present invention will be explained in more detail below with reference to examples and comparative examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

[0061] Example 1 Pulp slurry, which was a mixture of 50% by mass of softwood kraft pulp (NBKP) and 50% by mass of hardwood kraft pulp (LBKP), was beaten using a double-disc refiner to a freeness of 590 ml. Next, chemicals were added in the proportions shown in Table 1 to 100 parts by mass of the pulp raw material contained in the toilet paper, and the mixture was thoroughly stirred to make each component uniform, thereby preparing a pulp slurry. The pulp slurry prepared in this manner was made into paper using a twin-wire Yankee machine, and the first stage of calendering was performed at the line pressure shown in Table 1 to obtain a toilet paper base paper roll. During papermaking, the ratio of the discharge water flow rate to the wire speed (J / W ratio) was adjusted so that Tw / Yw would be the value shown in Table 1, where Tw is the wet tensile strength of the toilet paper product in the length direction and Yw is the wet tensile strength in the width direction. The obtained base paper roll was placed in a processing machine and, while unwinding once, subjected to a second stage of calendaring under the conditions shown in Table 1, followed by embossing. The embossing was carried out by applying pressure with an embossing roll to which an embossing was applied, and the embossing height shown in Table 1 was achieved by changing the amount of pressure or pressure applied by the roll. After embossing, the roll was rewound to a specified length, and the resulting roll was cut to a specified width to obtain a one-ply toilet paper product.

[0062] Examples 2 to 6 The pulp blending ratio and chemical addition rate were changed as shown in Table 1, and the beating conditions were changed so that the freeness would be as shown in Table 1. In addition, papermaking was performed by adjusting the ratio of the water flow rate to the wire speed (J / W ratio) so that the Tw / Yw of the toilet paper product would be the value shown in Table 1, and the first stage of calendering was performed under the conditions shown in Table 1 to obtain a toilet paper base paper roll. Subsequently, a one-ply toilet paper product was obtained in the same manner as in Example 1, except that calendering and embossing were performed under the conditions shown in Table 1.

[0063] (Comparative Examples 1 to 4) The pulp blending ratio and chemical addition rate were changed as shown in Table 1, and the beating conditions were changed so that the freeness would be as shown in Table 1. In addition, papermaking was performed by adjusting the ratio of the water flow rate to the wire speed (J / W ratio) so that the Tw / Yw of the toilet paper product would be the value shown in Table 1, and the first stage of calendering was performed under the conditions shown in Table 1 to obtain a toilet paper base paper roll. Subsequently, a one-ply toilet paper product was obtained in the same manner as in Example 1, except that calendering and embossing were performed under the conditions shown in Table 1.

[0064] (evaluation) (Basic weight) The basis weight of the toilet paper obtained in the examples and comparative examples was measured in accordance with JIS P 8124.

[0065] (paper thickness) The thickness of a single sheet of toilet paper obtained in the examples and comparative examples was measured using a thickness gauge (manufactured by Hybridge Manufacturing Co., Ltd.) by lowering the probe onto the sample at a speed of 1 mm per second or less, and then reading the value 10 seconds later. The average thickness of a single sheet of toilet paper was calculated for eight samples and used as the paper thickness. Paper thickness measurements were performed in an environment compliant with ISO187 (temperature 23±1°C, relative humidity 50±2%). The thickness of the 10 sheets of toilet paper obtained in the examples and comparative examples was measured by stacking 10 sheets of toilet paper, using a thickness meter (manufactured by Hybridge Manufacturing Co., Ltd.), lowering the probe onto the sample at a speed of 1 mm per second or less, and reading the value after 10 seconds. The thickness of the 10 sheets was measured at 8 points on the 10-ply sample, and the average value was calculated to determine the thickness of the 10 sheets.

[0066] (density) The density (g / cm) of 10 sheets of toilet paper obtained in the examples and comparative examples 3 ) was calculated using the following formula: Density of one sheet (g / cm 3 ) = basis weight of one sheet (g / m 2 ) / Thickness of one sheet of paper (μm) In addition, the density (g / cm 3 ) of 10 sheets of toilet paper obtained in the examples and comparative examples was 3 ) was calculated using the following formula: where the basis weight (g / m) of 10 sheets of toilet paper 2 ) is the basis weight (g / m2) of one sheet of toilet paper. 2 ) multiplied by 10, which refers to the basis weight of 10 sheets. Density of 10 sheets (g / cm 3 ) = basis weight of 10 sheets (g / m 2 ) / 10 sheets of paper thickness (μm)

[0067] (specific volume) The specific volume (cm) of one sheet of toilet paper obtained in the examples and comparative examples 3 / g) was calculated using the following formula: Specific volume of one sheet (cm 3 / g) = Thickness of one sheet (μm) / Basis weight of one sheet (g / m 2 ) In addition, the specific volume (cm ) of 10 sheets of toilet paper obtained in the examples and comparative examples was 3 / g) was calculated using the following formula: Specific volume of 10 sheets (cm 3 / g) = 10 sheets of paper thickness (μm) / 10 sheets of basis weight (g / m 2 )

[0068] (Product disintegrated fiber length) The disintegrated fiber length of the toilet paper products obtained in the Examples and Comparative Examples was measured using a fiber length measuring device, Kajaani Fiber Lab Ver. 4.0 (manufactured by Metso Automation), for the fiber dispersion slurry obtained by disintegrating the product. The fiber dispersion slurry was obtained by adding 4 g of toilet paper to 200 ml of water, operating a disintegrator at 4500 rpm, and stirring until sufficiently disintegrated. The obtained fiber dispersion slurry was diluted to 0.01% by mass or more and 0.02% by mass or less, and the projected length of the fibers contained in 10 ml of the slurry was measured using the fiber length measuring device, and the length-weighted average fiber length was calculated.

[0069] (HF value measurement) The HF values ​​of the toilet paper obtained 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 a sample table, and a bladed rotor was pressed against the sample from above with a pressure of 100 mN. The bladed rotor was then rotated at a rotation speed of 2.0 rpm, and the vibration frequency at that time was measured. Furthermore, the vertical deformation displacement was calculated when the bladed rotor was pressed against another sample cut into a circle with a diameter of 112.8 mm with a pressure of 100 mN and 600 mN. The HF value was automatically calculated from the vibration frequency and the deformation displacement, and the calculation algorithm was TP II. The above measurement was performed 10 times for each of the first side (outer surface) and the second side (inner surface) of each sample, and the average values ​​for the first and second sides were calculated. The average HF value was calculated from the average HF values ​​of the first and second sides calculated in this way. The above samples were measured in an environment conforming to ISO187 (temperature 23±1°C, relative humidity 50±2%). Furthermore, during the measurements, calibration was performed using a standard sample (emetec ref.2X(nn.n)) according to the accompanying instructions, and the algorithm was set to TP II. The calculation software used was emetec measurement system ver.3.22.

[0070] (Wet burst strength and moisture content) The wet burst strength of the toilet paper obtained in the examples and comparative examples was measured as follows. First, toilet paper was cut into 5 x 5 cm pieces, and 60 sheets were stacked to prepare a test piece, and the weight was measured. The test piece was immersed in pure water at 23 ° C., and excess water was removed using filter paper (Toyo Roshi Kaisha, Ltd., Standard Filter Paper No. 26), and the weight was measured again. After confirming that the 60-ply test piece was not damaged, such as torn, several sheets of filter paper were placed on top and bottom of it, and then pressed vertically to perform uniform dehydration. The vertical pressing was sufficient as long as the test piece was uniformly dehydrated, and was appropriately adjusted so that the moisture content of the test piece was 170% to 200%. After confirming that the moisture content of the test piece after pressing was 170% to 200%, the burst strength (kPa) was measured using a low-pressure burst tester (Kumagaya Riki Kogyo Co., Ltd., 2021-C). The wet burst strength was calculated as the average of six measurements. The wet burst strength was measured in an environment conforming to ISO 187 (temperature 23±1°C, relative humidity 50±2%). The moisture content of the toilet paper was calculated using the following formula. Moisture content (%) = (difference in test piece weight before and after immersion) x 100 / test piece weight before immersion

[0071] (Dry tensile strength) The dry tensile strength of the toilet paper obtained in the examples and comparative examples was measured using a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.). Measurements were performed under conditions of a sample width of 15 mm, a span length of 100 mm, and a tensile speed of 50 mm / min. The average value of six measurements was calculated as the dry tensile strength. The dry tensile strength measurements were performed in an environment conforming to ISO187 (temperature 23±1°C, relative humidity 50±2%).

[0072] (growth rate) The elongation of the toilet paper obtained in the examples and comparative examples was measured using a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.). Measurements were performed under conditions of a sample width of 15 mm, a span length of 100 mm, and a tensile speed of 50 mm / min. The average value of six measurements was calculated as the elongation. The elongation measurements were performed in an environment conforming to ISO187 (temperature 23±1°C, relative humidity 50±2%). The elongation rate (%) was calculated using the following formula. Elongation rate (%) = elongation amount of sample (mm) x 100 / span length (mm)

[0073] (wet tensile strength) The wet tensile strength of the toilet paper obtained in the examples and comparative examples was measured using a horizontal tensile tester (manufactured by Kumagai Riki Kogyo Co., Ltd.). Measurements were performed using a sample width of 15 mm and a span length of 100 mm. Six sheets of the sample were stacked, and 0.1 ml of water was dropped onto the center of the sample. After 1 second, the sample was pulled at a speed of 50 mm / min. The average value of six measurements was calculated to determine the wet tensile strength. The wet tensile strength measurements were performed in an environment conforming to ISO 187 (temperature 23±1°C, relative humidity 50±2%).

[0074] (water decomposable) The water-disintegrability of the toilet paper obtained in the examples and comparative examples was measured in accordance with JIS P 4501. The measurement was carried out five times, and the average value was calculated to determine the water-disintegrability.

[0075] (embossing height) The embossing height of the toilet paper obtained in the examples and comparative examples was measured as follows. First, using a high-precision shape measurement system KS-1100 (manufactured by KEYENCE Corporation), height data of the second surface of the toilet paper was obtained at a resolution of 1 μm. The acquisition area was 1 cm square, and the image acquisition pitch was 10 μm. Next, the acquired image data was loaded into image analysis software IOMate 2007 (manufactured by i-Spec Co., Ltd.), and the obtained height data was classified into 256 gradations. After removing data from defective areas such as holes, a graph was created with gradation on the horizontal axis and the number of data on the vertical axis. A moving average was taken from the created graph over a total of five points, two before and two after, and the graph was redrawn. For each point on the newly redrawn graph, calculations were performed using the values ​​of the two points: the desired point and the point immediately before it. A moving average was taken from the obtained slope data over a total of seven points, three before and three after, and another graph was created with gradation on the horizontal axis and the slope after the moving average on the vertical axis. The position of the first inflection point in the portion of the obtained slope graph after the lowest point was visually determined, and the gradation on the horizontal axis at that position was defined as the threshold. Next, a weighted average of the height data for the portion below the defined threshold was calculated, and the obtained average value was defined as the "average height of the non-embossed portion." In addition, a weighted average of the height data for the portion above the defined threshold was calculated, and the obtained average value was defined as the "average height of the embossed portion." The value calculated by subtracting the "average height of the embossed portion" from the "average height of the non-embossed portion" was defined as the embossed height.

[0076] (Sensory evaluation: softness) The softness of the toilet paper obtained in the Examples and Comparative Examples was evaluated according to the following evaluation criteria. Specifically, 50 people touched the toilet paper obtained in the Examples and Comparative Examples and rated the softness of the toilet paper on a four-point scale. The symbols shown in Table 1 have the following meanings. <Softness> ◎: Particularly excellent ○:Excellent △: Slightly inferior ×: Inferior

[0077] (Sensory evaluation: durability when wet) The wet durability of the toilet paper obtained in the Examples and Comparative Examples was evaluated according to the following criteria. Specifically, the toilet paper obtained in the Examples and Comparative Examples was cut into 10 x 10 cm pieces, five sheets were stacked, and 0.5 ml of water was dropped near the center using a dropper. The wet sample was rubbed against the back of the hand several times, and the durability was evaluated on a four-point scale. The symbols in Table 1 have the following meanings. <Wet durability> ◎: Particularly durable ○: Durable △: Slightly less durable ×: Less durable

[0078] (Sensory evaluation: clogging resistance) The clogging resistance of the toilet paper obtained in the Examples and Comparative Examples was evaluated according to the following evaluation criteria. Specifically, 30 people used the toilet paper obtained in the Examples and Comparative Examples in their toilets, and the clogging resistance when flushed was evaluated on a four-point scale. The symbols shown in Table 1 have the following meanings. <Resistance to clogging> ◎: Particularly resistant to clogging ○: Not easily clogged △: Slightly prone to clogging ×: Easy to clog

[0079] (Sensory evaluation: ease of loosening when washed with water) The ease of unraveling when flushing the toilet paper obtained in the Examples and Comparative Examples was evaluated according to the following evaluation criteria. Specifically, 30 people used the toilet paper obtained in the Examples and Comparative Examples in the toilet, and the ease of unraveling when flushing was evaluated on a four-point scale. The symbols shown in Table 1 have the following meanings. <Resistance to clogging> ◎: Particularly easy to loosen ○: Easy to loosen △: A little difficult to loosen ×: Difficult to loosen

[0080] (Sensory evaluation: volume) The volume of the toilet paper obtained in the examples and comparative examples was evaluated according to the following evaluation criteria. Specifically, 50 people touched the toilet paper obtained in the examples and comparative examples, and the volume of the toilet paper was evaluated on a four-point scale. The symbols shown in Table 1 have the following meanings. <Volume> ◎: Particularly excellent volume ○: Excellent volume △: Slightly less voluminous ×: Poor volume

[0081] [Table 1]

[0082] [Table 2]

[0083] The toilet paper obtained in the examples achieved all of the properties of softness, strength when wet, and resistance to clogging during flushing. Furthermore, Examples 1, 3, 5 and 6 were particularly excellent in terms of ease of disentanglement when washed with water, and Examples 2 and 4 were particularly excellent in terms of volume. [Explanation of symbols]

[0084] 1. Toilet Paper Web 2 Front page 4 Side 2 10. Toilet paper P outer surface Q Inner surface

Claims

1. A single ply of toilet paper having a first side and a second side opposite the first side, an average of the hand feel value of the first surface and the hand feel value of the second surface is 65.0 or more; The wet burst strength when measured with 60 sheets of the toilet paper stacked together is 150 kPa or more, The toilet paper has a water disintegration time of 40 seconds or less, The toilet paper has a basis weight of 18.0 g / m ２ 24.0g / m or more ２ is as follows: The dry tensile strength of the toilet paper in the length direction is 0.80 N / 15 mm or more and 1.60 N / 15 mm or less, The dry tensile strength of the toilet paper in the width direction is 0.20 N / 15 mm or more and 0.60 N / 15 mm or less, The wet tensile strength in the length direction when six sheets of the toilet paper are stacked and measured is 0.30 N / 15 mm or more and 1.00 N / 15 mm or less, The wet tensile strength in the width direction when six sheets of the toilet paper are stacked and measured is 0.18 N / 15 mm or more and 0.45 N / 15 mm or less, The toilet paper has a wet tensile strength in the length direction of the toilet paper as Tw and a wet tensile strength in the width direction of the toilet paper as Yw, and the ratio Tw / Yw is 1.20 or more and 2.80 or less.

2. 10. The toilet paper of claim 1, wherein the toilet paper is embossed.

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