JP2023176398A - Toilet roll and manufacturing method of toilet roll - Google Patents

Abstract

To provide a toilet roll which is excellent in water absorption performance, unlikelihood to be broken when used, and texture of sheet and a roll in a toilet roll winding up 1 ply bulky toilet tissue paper into a roll shape and requires infrequent replacement, and a manufacturing method of the toilet roll.SOLUTION: In one ply toilet tissue paper 1x to be a toilet roll 1 wound up into a roll shape, TEA (tensile energy absorption) of the toilet tissue paper 1x is between 1.0 J/m2 and 5.5 J/m2, an amount of water absorption per unit area is between 100 g/m2 and 210 g/m2, a basis weight is between 12 g/m2 and 32 g/m2, and roll density of the toilet roll 1 is between 0.05 g/cm3 and 0.17 g/cm3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a toilet roll made of one-ply toilet paper and a method for manufacturing the same.

In toilet paper products, high bulk (specific volume) is an important quality factor in order to ensure water absorption.

Elements such as strength and softness (comprehensive sensory experience of suppleness, smoothness, and volume) are also important.

As a method for obtaining bulky, soft, and highly absorbent toilet paper, the TAD (Through Air Drying) method is known, in which wet paper is ventilated and dried without press dehydration in the dehydration and drying process of the papermaking process. .
Furthermore, a method is known in which the amount of tensile energy absorption of toilet paper is set within a predetermined range, thereby achieving both tear resistance and texture.

Prior art references for such toilet paper include, ^for example, U.S. Pat. A non-creped, air-dried tissue having 10 to about 150 protrusions, a cross-machine elongation of about 9 percent or more, and a basis weight of about 10 to 70 grams/ ^m2 . The sheet is disclosed.
Further, Patent Document 2 discloses that a one-ply toilet paper has a tensile energy absorption amount of 6.0 to 12.0 J/m ² in the longitudinal direction of the toilet paper, and that the amount of tensile energy absorbed in the longitudinal direction during drying is The square root of the product of the tensile strength and the tensile strength in the direction perpendicular to the length direction (GMT: Geometric Mean Titer) is 0.60 to 0.95 N/15 mm, and the A toilet paper is disclosed that has an elongation rate of 11.70 to 18.86% and a Young's modulus in the longitudinal direction of the toilet paper of 15 to 30 GPa.

Patent No. 3758702 Patent No. 7013828

However, in bulky toilet paper manufactured by air drying as in Patent Document 1, if the tensile energy absorption amount is within the range of Patent Document 2, the texture (softness) of bulky toilet paper will be lost. . On the other hand, if the tensile energy absorption amount is made too low in order to improve the feel to the touch, the material will easily tear due to its good water absorption.

Furthermore, if bulky toilet paper is made to be long in order to reduce the frequency of replacement, the texture (softness) of bulky toilet paper will be lost. Therefore, with conventional bulky one-ply toilet paper that has good water absorption properties, it has been difficult to achieve both tear resistance and texture.

The present invention has been made in view of the above circumstances, and provides a toilet roll made by winding bulky one-ply toilet paper into a roll. To provide a toilet roll that has a good feel to the touch and requires less frequent replacement.

The inventor conducted extensive research and determined the TEA (tensile energy absorption amount) of the toilet paper, the amount of water absorbed per unit area, and the basis weight of one ply in a toilet roll obtained by winding up one ply of toilet paper into a roll shape. By setting the roll density of each roll within a predetermined numerical range, a toilet that satisfies the requirements for water absorption, resistance to tearing during use, and texture of both the sheet and roll, and that requires less frequent replacement. It can be made into a roll, and the present invention has been completed. That is, the present invention provides the following.

(1) A first aspect of the present invention is a toilet roll obtained by winding one ply of toilet paper into a roll, and the toilet paper has a TEA (tensile energy absorption amount) of 1.0 J/m ² or more. 5.5 J/ ^m2 or less, water absorption per unit area is 100 g/ ^m2 or more and 210 g/m2 or ^less , basis weight is 12 g/ ^m2 or more and 32 g/ ^m2 or less, and the roll density of the roll is 0.05 g. This is a toilet roll characterized by having a weight/cm ³ or more and 0.17 g/cm ³ or less.

(2) A second aspect of the present invention is the toilet roll according to (1), in which the product of the tensile strength in the MD direction when dry and the tensile strength in the CD direction when dry in the toilet paper is It is characterized in that the square root GMT is 1.1 N/25 mm or more and 3.6 N/25 mm or less.

(3) A third aspect of the present invention is the toilet roll according to (1), characterized in that the specific volume of the toilet paper is 4 cm ³ /g or more and 20 cm ³ /g or less. be.

(4) A fourth aspect of the present invention is the toilet roll according to (1), characterized in that the toilet paper has a paper thickness of 100 μm or more and 320 μm or less.

(5) A fifth aspect of the present invention is the toilet roll according to (1), characterized in that the roll diameter is 100 mm or more and 150 mm or less.

(6) A sixth aspect of the present invention is the toilet roll according to (1), characterized in that the roll length of the roll is 42 m or more and 94 m or less.

(7) A seventh aspect of the present invention is the toilet roll according to (1), in which a bladed rotor is applied to the toilet paper sample placed on a sample stand at a pressure of 100 mN using a tissue softness measuring device TSA. When the sample stage was rotated at a rotation speed of 2.0 (/sec) after being pushed in from above as the indentation pressure, and the vibration of the sample stage was measured with a vibration sensor, the low frequency was automatically acquired by the software on the TSA. It is characterized in that the intensity (TS750) of the maximum peak of the first spectrum from the side is 14 dBV ² rms or more and 38 dBV ² rms or less.

(8) The eighth aspect of the present invention is the toilet roll according to (7), in which the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz among the spectra acquired by the TSA is 7 dBV ² rms or more. It is characterized in that it is 21 dBV ² rms or less.

(9) A ninth aspect of the present invention is the toilet roll according to (7), in which the TSA prevents the bladed rotor from rotating with respect to the toilet paper sample placed on the sample stand. When the sample was pressed from above with a pressing pressure of 100 mN and 600 mN, respectively, the measured value of rigidity (D), expressed as the amount of vertical deformation displacement of the sample between the pressing pressures of 100 mN and 600 mN, was 1.7 mm. /N or more and 4.6 mm/N or less.

(10) A tenth aspect of the present invention is the toilet roll according to (1), in which the water absorption amount per unit weight of the toilet paper is 6.0 g/g or more and 10.0 g/g or less. It is characterized by:

(11) An eleventh aspect of the present invention is the toilet roll according to (1), characterized in that the toilet paper is subjected to a dry crepe treatment.

(12) A twelfth aspect of the present invention is the method for manufacturing a toilet roll according to (1), characterized in that the toilet paper is manufactured by a TAD papermaking method.

According to the present invention, a toilet roll obtained by winding a bulky one-ply toilet paper into a roll has good water absorption, resistance to tearing during use, and texture of the sheet and roll, and, It is possible to provide a toilet roll that satisfies the need for less frequent replacement.

FIG. 1 is a perspective view showing the appearance of a toilet roll according to an embodiment of the present invention.

Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "this embodiment") will be described in detail. The present embodiment below is an illustration for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be implemented with appropriate modifications within the scope of its gist.

In addition, in the drawings, the same elements are given the same reference numerals, and overlapping explanations will be omitted. In addition, the positional relationships such as top, bottom, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios.

<Toilet roll>
FIG. 1 is a perspective view showing the appearance of a toilet roll 1 according to an embodiment of the present invention. A toilet roll 1 according to an embodiment of the present invention is a toilet roll 1 obtained by winding up one ply of toilet paper 1x (hereinafter also simply referred to as a sheet) into a roll shape. Note that the toilet paper 1x is preferably perforated in the width direction at approximately equal intervals in the flow direction (not shown).
As shown in FIG. 1, among the surfaces of the toilet paper 1x, the surface facing the outside of the roll is referred to as the surface 1a (the surface of the toilet paper 1x), and the surface facing the center of the roll is referred to as the back surface 1b (the surface of the toilet paper 1x). ), the outermost end of the rolled up toilet paper 1x is referred to as the outermost edge 1e of the toilet paper 1x.

(roll length and diameter)
The roll length of the toilet roll 1 is preferably 42 m or more and 94 m or less, more preferably 46 m or more and 80 m or less, and even more preferably 56 m or more and 70 m or less. If the roll length is less than 42 m, the frequency of replacement of the toilet roll 1 will increase. When the winding length exceeds 94 m, the roll density becomes high instead when the winding diameter DR (described later) is within a certain range, and the feel of the roll product is poor.
Further, the roll diameter DR of the toilet roll 1 is preferably 100 mm or more and 150 mm or less, more preferably 112 mm or more and 138 mm or less, and even more preferably 117 mm or more and 130 mm or less. If the winding diameter DR is less than 100 mm, the winding length will be shortened due to the bulkiness, and the frequency of replacement will increase. If the winding diameter DR exceeds 150 mm, and the winding length is within a certain range, the basis weight will instead increase, resulting in excessive bulk, resulting in poor feel to the touch.

The roll length is actually measured by measuring the length of 10 sheets of toilet paper 1x between the perforations of the toilet roll 1. Thereafter, the number of sheets of toilet paper 1x in the toilet roll 1 is actually measured, and the roll length is determined by proportional calculation from the length of 10 sheets and the number of sheets of toilet paper 1x. For example, if the length of 10 sheets is 1.80 m and the number of sheets of 1x toilet paper is 150 sheets, then 1.80 m x (150/10) = 27 m. Note that if the toilet roll 1 does not have perforations, the roll length can be measured by actual measurement. Moreover, the winding diameter DR of the roll is measured using the Diameter Rule manufactured by Muratec KDS Corporation. In the measurement, 10 toilet rolls 1 are measured and the measurement results are averaged.

(Sheet length and sheet width)
Further, the length between perforations (sheet length of toilet paper 1x) is preferably 96 mm or more and 130 mm or less, more preferably 102 mm or more and 126 mm or less, and even more preferably 108 mm or more and 120 mm or less. Furthermore, the sheet width of the toilet paper 1x is preferably 96 mm or more and 130 mm or less, more preferably 102 mm or more and 126 mm or less, and even more preferably 108 mm or more and 120 mm or less. Since the sheet length and sheet width are each within the above numerical ranges, when using the toilet roll 1 with excellent water absorption as in the present application, the area used is appropriate and a large amount of water can be absorbed. .

(roll weight)
Furthermore, the roll weight of the toilet roll 1 is preferably 80 g or more and 220 g or less, more preferably 94 g or more and 200 g or less, and even more preferably 100 g or more and 192 g or less. By having the roll weight within the above numerical range, the toilet roll 1 has good water absorption and resistance to tearing during use, has a good feel as a roll product, and requires less frequent replacement. I can do it.
Note that the roll mass in the above numerical range is the mass of one roll per roll width of 114 mm not including the core (paper tube). If the roll width is not 114 mm, it is converted into a mass per 114 mm by proportional calculation.

(core outer diameter)
The core outer diameter DI, which is the outer diameter of the core of the toilet roll 1 of the present invention, is preferably 25 mm or more and 48 mm or less, more preferably 35 mm or more and 46 mm or less, and 37 mm or more and 43 mm or less. is even more preferable. By having the core outer diameter DI within the above numerical range, the toilet roll 1 has good water absorption and resistance to tearing during use, has a good feel as a roll product, and requires less frequent replacement. can do.
The core outer diameter DI is measured using the Diameter Rule manufactured by Muratec KDS Corporation. In the measurement, 10 toilet rolls 1 are measured and the measurement results are averaged.

(roll density)
The roll density of the toilet roll 1 is 0.05 g/cm ³ or more and 0.17 g/cm ³ or less, preferably 0.06 g/cm ³ or more and 0.15 g/cm ³ or less, and 0.07 g/cm ³ More preferably, it is 0.13 g/cm ³ or less. If the roll density of the toilet roll 1 is less than 0.05 g/ ^cm3 , the replacement frequency will be high (if the roll diameter DR and the basis weight of the toilet paper 1x are the same, the lower the roll density, the shorter the roll length, When the diameter DR and roll length are the same, the lower the roll density, the lower the basis weight of toilet paper 1x, and as a result, the amount used at one time increases). When the roll density of the toilet roll 1 exceeds 0.17 g/cm ³ , the feel of the roll product is poor.

Roll density is expressed as (roll mass)/(roll volume). The roll mass is the mass of the toilet roll 1 per roll width of 114 mm. The roll volume is expressed as [{cross-sectional area of the outer diameter (rolling diameter DR) portion of the roll}−(cross-sectional area of the core outer diameter DI portion)]×roll width (converted to around 114 mm). For example, when the roll mass (excluding the core) per roll width of 114 mm is 123 g, the winding diameter DR is 125 mm, and the core outer diameter DI is 39 mm, the roll density is 0.09 g/cm ³ . In addition, when the toilet roll 1 does not have a core, let the diameter of the center hole be the core outer diameter DI.

<Toilet paper>
The base paper used for the toilet paper 1x according to one embodiment of the present invention may be made of 100% by mass of wood pulp, and may include waste paper pulp, non-wood pulp, deinked pulp, waste paper for liquid beverage paper packs, etc. However, from the viewpoint of quality, the content is preferably 50% by mass or less, more preferably 30% by mass or less, still more preferably 10% by mass or less, and most preferably 0% by mass. In order to obtain the target quality, the content of NBKP (softwood bleached kraft pulp) is preferably 10% by mass or more and 60% by mass or less, more preferably 20% by mass or more and 50% by mass or less, It is more preferably 30% by mass or more and 40% by mass or less. Further, the content of LBKP (hardwood bleached kraft pulp) is preferably 40% by mass or more and 90% by mass or less, more preferably 50% by mass or more and 80% by mass or less, and 60% by mass or more and 70% by mass or less. It is more preferable that
In addition, as additives to the above-mentioned paper stock, depending on the required quality of the final product, softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, water absorption improvers, etc. Agents etc. can be used. Although it is preferable not to use a wet paper strength enhancer, a temporary wet paper strength enhancer may be used.

The one-ply toilet paper 1x according to one embodiment of the present invention is preferably embossed, but the embossment is preferably a single embossment of deco emboss or no embossing.

(Basic weight)
The basis weight of 1x toilet paper is 12 g/m ² or more and 32 g/m ² or less, preferably 14 g/m ² or more and 30 g/m ² or less, and 17 g/m ² or more and 27 g/m ² or less. is more preferable. When the basis weight of the toilet paper 1x is less than 12 g/m ² , the toilet paper 1x has poor water absorbency. When the basis weight of the toilet paper 1x exceeds 32 g/m ² , it becomes too bulky and the feel of the toilet paper 1x is inferior. Note that the basis weight of toilet paper 1x is measured based on JIS P 8124.

(paper thickness)
The paper thickness of the toilet paper 1x is preferably 100 μm or more and 320 μm or less, more preferably 120 μm or more and 280 μm or less, and even more preferably 140 μm or more and 240 μm or less. When the paper thickness is less than 100 μm, the feel of the toilet paper 1x is poor. If the paper thickness exceeds 320 μm, the volume becomes too bulky when the roll diameter DR is within a certain range, and the toilet roll 1 will have to be replaced more frequently.
The paper thickness is measured using a thickness gauge (Dial Thickness Gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa and a measuring tip diameter of 30 mm.The sample is placed between the measuring tip and the measuring stand, and the gauge is read when the measuring tip is lowered at a speed of 1 mm or less per second. Then, after stacking 10 sets of 1-ply toilet paper 1x and measuring 10 sheets, the value is calculated by dividing by 10. Moreover, the final paper thickness is determined by repeating the measurement 10 times and averaging the measurement results.

(specific volume)
Further, the specific volume of toilet paper 1x is preferably 4 cm ³ /g or more and 20 cm ³ /g or less, more preferably 5 cm ³ /g or more and 18 cm ³ /g or less, and 6 cm ³ /g or more and 16 cm ³ /g. It is more preferable that it is less than g. When the specific volume is less than 4 cm ³ /g, the water absorbency of toilet paper 1x is poor. When the specific volume exceeds 20 cm ³ /g, the water absorbency of the toilet paper 1x is good, but it becomes too bulky and tends to tear during use. The specific volume is calculated by dividing the paper thickness of 1x toilet paper by the basis weight, and is expressed as the volume cm ³ per unit g.

(DMDT and DCDT)
The tensile strength DMDT (Dry Machine Direction Tensile Strength) of toilet paper 1x in the MD direction during drying based on JIS P 8113 is preferably 2.0 N/25 mm or more and 5.0 N/25 mm or less, and 2.3 N/25 mm. More preferably, it is 4.5 N/25 mm or less, and even more preferably 2.6 N/25 mm or more and 4.0 N/25 mm or less. Further, the tensile strength DCDT (Dry Cross Direction Tensile Strength) in the CD direction during drying is preferably 0.7 N/25 mm or more and 2.5 N/25 mm or less, and 0.8 N/25 mm or more and 2.1 N/25 mm or less. More preferably, it is 0.9 N/25 mm or more and 1.8 N/25 mm or less. If the DMDT is less than 2.0 N/25 mm or the DCDT is less than 0.7 N/25 mm, the toilet paper 1x tends to tear during use. If the DMDT exceeds 5.0 N/25 mm or the DCDT exceeds 2.5 N/25 mm, the feel of the toilet paper 1x is poor.
Note that the MD direction and the CD direction in this case mean that the manufacturing direction (flow direction) during the manufacturing of the toilet paper 1x is the MD direction, and the CD direction is a direction perpendicular to the MD direction.

In addition, the ratio (DMDT/DCDT) of the tensile strength in the MD direction (DMDT) when drying to the tensile strength in the CD direction (DCDT) when drying the toilet paper 1x should be 1.0 or more and 3.0 or less. It is preferably 1.2 or more and 2.8 or less, and even more preferably 1.4 or more and 2.6 or less. By having the ratio within the above numerical range, the toilet paper 1x can be made that is hard to tear during use and has a good feel to the touch.

And, the square root GMT of the product of the MD direction tensile strength (DMDT) when drying and the CD direction tensile strength (DCDT) when drying the toilet paper 1x is 1.1N/25mm or more and 3.6N/25mm or less. It is preferably 1.3 N/25 mm or more and 3.1 N/25 mm or less, and even more preferably 1.5 N/25 mm or more and 2.7 N/25 mm or less. If the GMT is less than 1.1 N/25 mm, the toilet paper 1x becomes bulky and absorbs too much water, making it easy to tear during use. When GMT exceeds 3.6 N/25 mm, the feel of the toilet paper 1x is inferior.
The tensile strength in each direction during drying is measured in accordance with JIS P 8113, and GMT is determined as the square root of the product of these tensile strengths. The test piece width is 25 mm, the tensile speed is 300 mm/min, and the number of plies (1 ply) of the product is measured.

(Tensile energy absorption amount)
The TEA (tensile energy absorption amount) of 1x toilet paper is 1.0 J/m ² or more and 5.5 J/m ² or less, preferably 1.5 J/m ² or more and 5.2 J/m ² or less. , more preferably 2.0 J/m ² or more and 5.0 J/m ² or less. If the TEA is less than 1.0 J/m ² , the toilet paper 1x is bulky and difficult to stretch, making it easy to tear during use. When TEA exceeds 5.5 J/m ² , the texture of toilet paper 1x is inferior.
TEA can be measured in the same manner as the tensile strength measurement described above, and the tensile load and elongation until the test piece breaks during measurement are plotted, and the tensile energy absorption amount is calculated from the tensile load-elongation curve. However, the test piece width is 15 mm, the tensile speed is 50 mm/min, and the number of product plies (1 ply) is measured as is.

(Water absorption amount)
In addition, the water absorption amount per unit area of 1x toilet paper is 100 g/m ² or more and 210 g/m ² or less, preferably 110 g/m ² or more and 200 g/m ² or less, and 120 g/m ² or more and 190 g/m 2 or less. More preferably, it is ² or less. If the amount of water absorbed per unit area is less than 100 g/m ² , the water absorbency of toilet paper 1x will be poor. If the amount of water absorbed per unit area exceeds 210 g/m ² , the water absorption is good, but the basis weight becomes too high, resulting in excessive bulk, and the feel of the toilet paper 1x is inferior.
Further, the water absorption amount per unit weight of toilet paper 1x is preferably 6.0 g/g or more and 10.0 g/g or less, more preferably 6.4 g/g or more and 9.6 g/g or less, More preferably, it is 6.8 g/g or more and 9.2 g/g or less. If the amount of water absorbed per unit weight is less than 6.0 g/g, the water absorbency of toilet paper 1x will be poor. When the amount of water absorbed per unit weight exceeds 10.0 g/g, the water absorbency of 1x toilet paper is good, but it becomes easy to tear during use.
In addition, each water absorption amount of toilet paper 1x is measured as follows.

First, the toilet roll 1 is stored for 24 hours or more in an environment with a temperature of 23° C. and a humidity of 50%. Next, one set (one ply) of test pieces having a sample size of 80 mm in the width direction x 100 mm in the flow direction is taken from the toilet roll 1, and the weight is measured. Thereafter, this test piece was placed on a stainless steel mesh (Tokyu Hands Net Store Eggs stainless wire mesh 10 mesh 100 mm x 200 mm, wire diameter 0.5 mm, hereinafter referred to as the mesh). At this time, make sure that the width direction of the sample (80 mm) is parallel to the net size of 100 mm, and the flow direction of the sample (100 mm) is parallel to the net size of 200 mm, so that the sample does not protrude from the net. put it on. Next, collect distilled water in the vat so that the depth of the distilled water is 1 cm or more.
Then, the test piece and the net are gently submerged in the vat to allow impregnation. At this time, there is no problem even if the test piece floats on the water surface. After 10 seconds of impregnation, the screen is gently pulled up into the air along with the test piece to prevent the sample from protruding from the screen, and left to stand for 10 seconds. After that, tilt the screen 90 degrees and drop (remove) excess water. At this time, the sample is stuck to the wire mesh, so even if it is tilted 90 degrees, the sample will not fall. Note that when tilting the sample by 90 degrees, the vertical direction of the sample should be the flow direction of the sample.
Then, it is allowed to stand still for 120 seconds while being tilted at 90 degrees. After 120 seconds, the sample is removed from the screen and weighed. For a 1-ply sample, the water absorption amount is calculated from the sample weight before impregnation and the sample weight after impregnation (example below). Repeat the measurements 5 times and average the values. Note that all of the above operations are performed in an environment with a temperature of 23° C. and a humidity of 50%. Also, when collecting samples, take them from areas that do not include perforations. If the interval between perforations is 100 mm or less, perforations may be included.
(calculation example)
Sample weight before impregnation (sample size 80mm x 100mm): 0.32g
Sample weight after impregnation: 2.08g
Water absorption = (sample weight after impregnation) - (sample weight before impregnation) = 1.76 (water g/paper 0.008 m ² ) = 220 g/m ² (water absorption per 1 m ² )
Water absorption = (Sample weight after impregnation) - (Sample weight before impregnation) = 1.76 (Water g/Paper 0.32g) = 5.5g/g (Water absorption per 1g = (Water absorption per 1 ^m2 ) Amount/Basic weight of 1 ply))

(Measurement value by TSA)
In the toilet roll 1 according to an embodiment of the present invention, the tissue softness measuring device TSA is used to press a bladed rotor from above onto a 1x sample of toilet paper placed on a sample stage with a pushing pressure of 100 mN, and then the number of revolutions is The intensity of the maximum peak of the first spectrum from the low frequency side, which was automatically acquired by the software on the TSA when rotating at 2.0 (/sec) and measuring the vibration of the sample stage with a vibration sensor. (TS750) is preferably 14 dBV ² rms or more and 38 dBV ² rms or less, more preferably 16 dBV ² rms or more and 33 dBV ² rms or less, and even more preferably 17 dBV ² rms or more and 28 dBV ² rms or less. If the TS750 is less than 14 dBV ² rms, the toilet paper 1x becomes bulky and absorbs too much water, making it easy to tear during use. When TS750 exceeds 38 dBV ² rms, the texture is inferior to that of toilet paper 1x.

Further, among the spectra acquired by TSA, the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz is preferably 7 dBV ² rms or more and 21 dBV ² rms or less, and more preferably 8 dBV ² rms or more and 18 dBV ² rms or less. It is preferably 9 dBV ² rms or more and 15 dBV ² rms or less. If TS7 is less than 7 dBV ² rms, the toilet paper 1x becomes bulky and absorbs too much water, making it easy to tear during use. When TS7 exceeds 21 dBV ² rms, the texture is inferior to that of toilet paper 1x.

Furthermore, in the toilet roll 1 according to an embodiment of the present invention, the TSA pushes the sample of toilet paper 1x placed on the sample table from above with pushing pressures of 100 mN and 600 mN, respectively, without rotating the bladed rotor. In this case, the measured value of rigidity (D), expressed as the amount of vertical deformation of the sample under indentation pressures of 100 mN and 600 mN, respectively, must be 1.7 mm/N or more and 4.6 mm/N or less. is preferable, more preferably 2.0 mm/N or more and 4.3 mm/N or less, and even more preferably 2.2 mm/N or more and 4.0 mm/N or less. When the measured value of D is less than 1.7 mm/N, the feel of the toilet paper 1x is poor. When the measured value of D exceeds 4.6 mm/N, the toilet paper 1x becomes bulky and absorbs too much water, making it easy to tear during use.

The values of TS7, TS750, and D at this time are the values obtained by measuring the portion corresponding to the outer surface of the toilet roll 1 of 1-ply toilet paper 1x using a tissue softness measuring device TSA (manufactured by emtec; Tissue Softness Analyzer). The lower the TS7 value, the better the softness and fluffiness (surface softness and bulk softness), the lower the TS750 value, the better the smoothness, and the higher the D value, the more suppleness. Excellent.

Note that the method of measuring each value of TS7, TS750, and D using the tissue softness measuring device TSA and the measuring device used are described in detail in, for example, Japanese Patent Application Publication No. 2013-236904. For various measurement methods using the tissue softness measuring device TSA, please refer to the above-mentioned patent documents.

<Toilet roll manufacturing method>
Regarding the manufacturing process of the toilet paper 1x and the toilet roll 1, they can be manufactured by going through a paper making process, performing embossing if necessary, and then winding up into a roll.
Note that the toilet paper 1x is preferably manufactured by the TAD papermaking method. The TAD papermaking method is a method in which wet paper is ventilated and dried without press dehydration in the dehydration and drying process of the papermaking process.By being manufactured by the TAD papermaking method, toilet paper that is bulky, soft, and has excellent water absorption is produced. It can be 1x. Moreover, it is preferable that the toilet paper 1x is subjected to dry crepe treatment. The dry crepe treatment allows the toilet paper 1x to be bulky, pleasant to the touch, and highly absorbent.

As explained above, according to the present embodiment, in the toilet roll 1 obtained by winding up the bulky 1-ply toilet paper 1x into a roll, water absorption, resistance to tearing during use, and texture of the sheet and roll are improved. It is possible to provide a toilet roll 1 that is good in all cases and requires less frequent replacement.

The present invention will be explained in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Toilet papers (sheets) and toilet rolls of Examples 1 to 15 and Comparative Examples 1 to 9 were produced under the conditions shown in Tables 1 and 2, and the following evaluations were performed. Note that in Examples 1 to 15 and Comparative Examples 1 to 8, paper was made by the TAD paper making method, but in Comparative Example 9, paper was made not by the TAD paper making method but by a general Yankee dryer dry crepe machine.
Each evaluation was performed after maintaining an equilibrium state under the temperature and humidity conditions (23±1° C., 50±2% RH) specified in JIS P8111. In addition, each parameter other than the evaluation below was performed according to the standards or measurement methods mentioned above.

(Feeling of the sheet)
Thirty monitors evaluated the feel (softness, smoothness) of the toilet paper (sheet) when they touched it directly with their hands. The texture was evaluated on a five-point scale depending on the number of monitors who evaluated the feel as good.
◎: 28 or more monitors evaluated the feel to the touch as being good ○: 24 to 27 monitors evaluated the feel to the touch as good △: 18 to 23 monitors evaluated the feel to the touch as good ×: Feel to the touch 13 to 17 monitors rated the feel as good ××: 12 or fewer monitors rated the feel as good.

(Water absorption)
The water absorption amount (per unit area) was measured and evaluated as described above. Evaluation criteria were based on the following four levels.
◎: Water absorption amount is 240 g/m ² or more 〇: Water absorption amount is 220 to 239 g/m ²
△: Water absorption amount is 200 to 219 g/m ²
×: Water absorption amount is 199g/ ^m2 or less

(Difficult to tear during use)
Thirty monitors conducted an evaluation by wiping off water with toilet paper (sheets) after using a heated toilet seat. The toilet paper was rated on a 5-point scale based on the number of monitors who rated it as being hard to tear.
◎: 28 or more monitors rated it as tear-resistant ○: 24-27 monitors rated it as tear-resistant △: 18-23 monitors rated it as tear-resistant ×: Monitors rated as tear-resistant , 13-17 people XX: 12 or fewer monitors rated it as being hard to tear.

(Feeling as a roll product)
Thirty monitors evaluated the feel of the toilet roll (product) when they touched it directly with their hands. The texture was evaluated on a four-level scale depending on the number of monitors who evaluated the feel as good.
◎: 28 or more monitors evaluated the feel to the touch as being good ○: 24 to 27 monitors evaluated the feel to the touch as good △: 18 to 23 monitors evaluated the feel to the touch as good ×: Feel to the touch Less than 17 monitors rated the feeling as good.

(Infrequent replacement)
Thirty monitors measured the time it took to use up one roll of toilet paper (sheets) and evaluated the infrequency of roll replacement (less frequent replacement means the roll lasts longer). Evaluation was made on a four-level scale depending on the number of monitors who evaluated the frequency of roll replacement as low.
◎: 28 or more monitors evaluated that the frequency of replacement was low ○: 24 to 27 monitors evaluated that the frequency of replacement was low △: 18 to 23 monitors evaluated that the frequency of replacement was low ×: Replacement 17 or fewer monitors rated it as infrequent.

Table 1 shows the conditions and evaluation results of each example, and Table 2 shows the conditions and evaluation results of each comparative example. Note that if each evaluation is △ or higher, the product is acceptable.

From the above, according to this example, the toilet roll made of a bulky one-ply toilet paper has good water absorption, resistance to tearing during use, and texture of the sheet and roll. It was at least confirmed that a toilet roll that satisfies the requirements of , and that the frequency of replacement is low can be obtained.

1 Toilet roll 1a Front side 1b Back side 1e Edge of outermost roll of toilet paper 1x Toilet paper

Claims (12)

A toilet roll made of one-ply toilet paper wound into a roll,
The toilet paper has a TEA (tensile energy absorption amount) of 1.0 J/ ^m2 or more and 5.5 J/m2 ^or less, a water absorption per unit area of 100 g/ ^m2 or more and 210 g/ ^m2 or less, and a basis weight of 12 g/m2 or less. m ² or more and 32 g/m ² or less,
A toilet roll characterized in that the roll has a roll density of 0.05 g/cm ³ or more and 0.17 g/cm ³ or less. The toilet paper is characterized in that the square root GMT of the product of the tensile strength in the MD direction when dry and the tensile strength in the CD direction when dry is 1.1 N/25 mm or more and 3.6 N/25 mm or less. The toilet roll according to item 1. The toilet roll according to claim 1, wherein the toilet paper has a specific volume of 4 cm ³ /g or more and 20 cm ³ /g or less. The toilet roll according to claim 1, wherein the toilet paper has a paper thickness of 100 μm or more and 320 μm or less. The toilet roll according to claim 1, wherein the roll diameter is 100 mm or more and 150 mm or less. The toilet roll according to claim 1, wherein the roll length is 42 m or more and 94 m or less. Using the tissue softness measuring device TSA, a rotor with blades was pressed from above with a pushing pressure of 100 mN onto the toilet paper sample placed on the sample stage, and then rotated at a rotation speed of 2.0 (/sec). When the vibration of the table is measured with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750) automatically acquired by the software on the TSA is 14 dBV ² rms or more and 38 dBV ² rms or less. Toilet roll according to claim 1, characterized in that: The toilet roll according to claim 7, wherein the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz among the spectra acquired by the TSA is 7 dBV ² rms or more and 21 dBV ² rms or less. According to the TSA, when the toilet paper sample placed on the sample stage is pushed from above with pushing pressures of 100 mN and 600 mN without rotating the bladed rotor, respectively, the pushing pressures are between 100 mN and 600 mN. The toilet according to claim 7, characterized in that a measured value of rigidity (D) expressed by the amount of deformation displacement in the vertical direction of the sample is 1.7 mm/N or more and 4.6 mm/N or less. roll. The toilet roll according to claim 1, wherein the water absorption amount per unit weight of the toilet paper is 6.0 g/g or more and 10.0 g/g or less. The toilet roll according to claim 1, wherein the toilet paper is dry creped. The method for manufacturing a toilet roll according to claim 1, wherein the toilet paper is manufactured by a TAD papermaking method.

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