Toilet roll and method for manufacturing toilet roll

Abstract

The present invention provides a toilet roll made by winding bulky toilet paper of 2 plies or more into a roll, which has good water absorption, resistance to tearing during use, and a good feel for both the sheet and the roll, and also satisfies the requirement of infrequent replacement, as well as a method for manufacturing a toilet roll. [Solution] A toilet roll 1 made by winding toilet paper 1x of 2 plies or more into a roll, wherein the GMT of the product of the tensile strength in the MD direction and the tensile strength in the CD direction when dry in the toilet paper 1x is 1.7 N / 25 mm or more and 4.8 N / 25 mm or less, and the water absorption per unit area is 200 g / m². 2 More than 420g / m 2 Below, the basis weight per ply is 10g / m². 2 More than 30g / m 2 The following applies, and the roll density of the roll is 0.05 g / cm³. 3 More than 0.17g / cm 3 The following toilet roll 1 is provided.

Description

Technical Field

[0001] The present invention relates to a toilet roll wound with two or more plies of toilet paper and a method for manufacturing the same.

Background Art

[0002] In toilet paper products, in order to ensure water absorption, a high bulk (specific volume) is an important factor in terms of quality.

[0003] Also, factors such as strength, softness (overall functionality of flexibility, smoothness, and volume feeling) are important.

[0004] [[ID=2)]]As a method for obtaining toilet paper with high bulk, softness, and excellent water absorption, in the dehydration and drying process of the papermaking process, a TAD (Through Air Drying) method of drying wet paper by ventilation without pressing dehydration is known. Also, a technique for achieving both tear resistance and touch feeling by setting the square root (GMT) of the product of the longitudinal strength and the transverse strength within a predetermined range is known.

[0005] As a prior art document of such toilet paper, for example, Patent Document 1 discloses a crepe-free air-dried tissue sheet having protrusions with a height of about 0.012 millimeters (0.005 inches) or more, about 10 to about 150 protrusions per 6.45 square centimeters (1 square inch), an elongation rate in the machine transverse direction of about 9 percent or more, and a basis weight of about 10 to 70 grams per square meter. Also, Patent Document 2 discloses two-ply toilet paper, wherein the tensile energy absorption amount in the length direction of the toilet paper is 4.0 to 10.0 J / m 2A toilet paper is disclosed characterized in that, when dry, the square root of the product of the tensile strength in the longitudinal direction and the tensile strength in the direction perpendicular to the longitudinal direction is 0.70 to 0.95 N / 15 mm, the elongation in the longitudinal direction of the toilet paper is 8.66 to 17.63%, and the Young's modulus in the longitudinal direction of the toilet paper is 10 to 30 GPa. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 3758702 [Patent Document 2] Patent No. 7013829 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, with bulky toilet paper manufactured by air-drying as described in Patent Document 1, if the GMT (Gross Moisture Factor) is within the range specified in Patent Document 2, the high absorbency may cause it to tear easily during use. Conversely, if the GMT is increased too much to prevent tearing, the tactile feel (softness) of bulky toilet paper is compromised.

[0008] Furthermore, with bulky toilet paper, making it longer to reduce the frequency of replacements would compromise the soft feel that bulky toilet paper offers. Therefore, it has been difficult to achieve both tear resistance and a soft feel with conventional, highly absorbent, bulky, two-ply toilet paper.

[0009] This invention has been made in view of these circumstances, and aims to provide a toilet roll that is made by winding bulky toilet paper of 2 plies or more into a roll, which has good water absorption, resistance to tearing during use, and a good feel for both the sheet and the roll, and that requires infrequent replacement. [Means for solving the problem]

[0010] The inventor conducted intensive studies and found that, in a toilet roll in which two or more plies of toilet paper are wound in a roll shape, by setting the square root GMT of the product of the tensile strength in the MD direction and the tensile strength in the CD direction at the time of drying, the water absorption per unit area, and the basis weight of one ply, and the roll density of the roll within respective predetermined numerical ranges, it is possible to obtain a toilet roll that satisfies all of the following conditions: good water absorption, resistance to tearing during use, good touch feeling of both the sheet and the roll, and low replacement frequency, thus completing the present invention. That is, the present invention provides the following.

[0011] (1) The first aspect of the present invention is a toilet roll in which two or more plies of toilet paper are wound in a roll shape, wherein the square root GMT of the product of the tensile strength in the MD direction and the tensile strength in the CD direction at the time of drying in the toilet paper is 1.7 N / 25 mm or more and 4.8 N / 25 mm or less, the water absorption per unit area is 200 g / m 2 or more and 420 g / m 2 or less, the basis weight of one ply is 10 g / m 2 or more and 30 g / m 2 or less, and the roll density of the roll is 0.05 g / cm 3 or more and 0.17 g / cm 3 or less.

[0012] (2) The second aspect of the present invention is the toilet roll according to (1), wherein the TEA (tensile energy absorption) of the toilet paper is 3 J / m 2 or more and 15 J / m 2 or less.

[0013] (3) The third aspect of the present invention is the toilet roll according to (1), wherein the specific volume of the toilet paper is 4 cm 3 / g or more and 20 cm 3 / g or less.

[0014] (4) A fourth aspect of the present invention is the toilet roll described in (1), characterized in that the thickness of one ply of the toilet paper is 100 μm or more and 320 μm or less.

[0015] (5) A fifth aspect of the present invention is the toilet roll described in (1), characterized in that the roll has a winding diameter of 100 mm or more and 150 mm or less.

[0016] (6) A sixth aspect of the present invention is the toilet roll described in (1), characterized in that the length of the roll is 17m or more and 44m or less.

[0017] (7) A seventh aspect of the present invention is the toilet roll described in (1), wherein a tissue softness measuring device TSA is used to press a bladed rotor onto a sample of toilet paper placed on a sample stage with a pressing pressure of 100 mN, and then rotates it at a rotation speed of 2.0 ( / sec), and when the vibration of the sample stage is measured with a vibration sensor, the intensity of the first spectral maximum peak from the low frequency side, which is automatically acquired by the software on the TSA (TS750), is 16 dBV. 2 RMS or higher, 41 dBV 2 It is characterized by being less than or equal to rms.

[0018] (8) An eighth aspect of the present invention is the toilet roll described in (7), wherein the intensity of the maximum peak in the spectrum including 6500 Hz (TS7) of the spectrum obtained by the TSA is 6 dBV 2 rms over 20dBV 2 It is characterized by being less than or equal to rms.

[0019] (9) A ninth aspect of the present invention is a toilet roll as described in (7), characterized in that when the TSA presses down on the toilet paper sample placed on the sample stage with pressing pressures of 100 mN and 600 mN, respectively, without rotating the rotor with blades, the measured value of stiffness (D), which is expressed as the amount of vertical deformation displacement of the sample between pressing pressures of 100 mN and 600 mN, is 1 mm / N or more and 4 mm / N or less.

[0020] (10) A tenth aspect of the present invention is a toilet roll as described in (1), characterized in that the amount of water absorbed per unit weight of the toilet paper is 6.0 g / g or more and 10.0 g / g or less.

[0021] (11) An eleventh aspect of the present invention is the toilet roll described in (1), characterized in that the toilet paper is dry crepe processed.

[0022] (12) A twelfth aspect of the present invention is a method for manufacturing toilet paper rolls as described in (1), characterized in that the toilet paper is manufactured by the TAD papermaking method. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a toilet roll that is made by winding bulky toilet paper of 2 or more plies into a roll shape, and that satisfies the requirements of good water absorption, resistance to tearing during use, and a good feel for both the sheet and the roll, as well as requiring infrequent replacement. [Brief explanation of the drawing]

[0024] [Figure 1] This is a perspective view showing the appearance of a toilet roll according to one embodiment of the present invention. [Modes for carrying out the invention]

[0025] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). This embodiment is illustrative for explaining the present invention and is not intended to limit the present invention to the following content. The present invention can be implemented by modifying it as appropriate within the scope of its gist.

[0026] In the drawings, identical elements will be denoted by the same reference numeral, and redundant explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as top, bottom, left, and right will be based on those shown in the drawings. Additionally, the dimensional ratios in the drawings are not limited to those shown.

[0027] <Toilet Roll> Figure 1 is a perspective view showing the appearance of a toilet roll 1 according to one embodiment of the present invention. The toilet roll 1 according to one embodiment of the present invention is a toilet roll 1 in which two or more plies of toilet paper 1x (hereinafter also simply referred to as a sheet) are wound into a roll shape. Preferably, the toilet paper 1x has perforations in the width direction at approximately equal intervals in the flow direction (not shown). As shown in Figure 1, the surface of the toilet paper 1x facing outwards from the roll is referred to as surface 1a (the surface of the toilet paper 1x), the surface facing towards the center of the roll is referred to as back surface 1b (the back surface of the toilet paper 1x), and the outermost end of the wound toilet paper 1x is referred to as the outermost edge 1e of the toilet paper 1x.

[0028] (Roll length and roll diameter) The length of toilet roll 1 is preferably 17m to 44m, more preferably 21m to 36m, and even more preferably 27m to 33m. If the length is less than 17m, the frequency of replacing toilet roll 1 will increase. If the length exceeds 44m, and the roll diameter DR (described later) is within a certain range, the roll density will increase instead, resulting in a less pleasant feel as a roll product. Furthermore, the roll diameter DR of 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 roll diameter DR is less than 100 mm, the bulkiness results in a shorter roll length, leading to a higher replacement frequency. If the roll diameter DR exceeds 150 mm, while the roll length remains within a certain range, the basis weight increases, resulting in excessive bulkiness and an inferior feel.

[0029] The roll length is determined by measuring the length of 10 sheets of toilet paper (1x) between the perforations of toilet roll 1. Then, the number of sheets of toilet paper (1x) in toilet roll 1 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of sheets of toilet paper (1x). For example, if the length of 10 sheets is 1.80m and the number of sheets of toilet paper (1x) is 150, then 1.80m × (150 / 10) = 27m. If toilet roll 1 does not have perforations, the roll length can be measured by hand. The roll diameter DR is measured using a Diameter Rule manufactured by Muratec KDS Co., Ltd. The measurement is performed by measuring 10 toilet rolls 1 and averaging the results.

[0030] (Sheet length and sheet width) Furthermore, the length between perforations (sheet length of toilet paper 1x) is preferably 96mm to 130mm, more preferably 102mm to 126mm, and even more preferably 108mm to 120mm. In addition, the sheet width of toilet paper 1x is preferably 96mm to 130mm, more preferably 102mm to 126mm, and even more preferably 108mm to 120mm. By having the sheet length and sheet width within the above numerical ranges, when using a toilet roll 1 with excellent water absorption like the present invention, the area used becomes appropriate, and a large amount of water can be absorbed.

[0031] (Roll weight) Furthermore, the roll weight of toilet roll 1 is preferably between 70g and 195g, more preferably between 80g and 175g, and even more preferably between 90g and 160g. By having the roll weight within the above numerical range, both water absorption and resistance to tearing during use are good, the toilet roll 1 has a good feel as a roll product, and can be replaced infrequently. Note that the roll mass within the above numerical range refers to the mass of one roll per 114 mm roll width, excluding the core (paper tube). If the roll width is not 114 mm, it will be converted to the mass per 114 mm using proportional calculation.

[0032] (Core outer diameter) Furthermore, the core outer diameter DI 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 even more preferably 37 mm or more and 43 mm or less. By having the core outer diameter DI within the above numerical range, both water absorption and resistance to tearing during use are good, the toilet roll 1 has a good feel as a roll product, and can be made to require infrequent replacement. The core outer diameter DI is measured using a Diameter Rule manufactured by Muratec KDS Corporation. The measurement is performed by measuring 10 toilet rolls and averaging the results.

[0033] (Roll density) The roll density of toilet roll 1 is 0.05 g / cm³. 3 More than 0.17g / cm 3 The following is the result: 0.06 g / cm³ 3 More than 0.15g / cm 3 Preferably, it is 0.07 g / cm³. 3 More than 0.13g / cm 3 It is more preferable that the roll density of toilet roll 1 is 0.05 g / cm³. 3If the roll density is less than 0.17 g / cm³, the replacement frequency will increase (if the roll diameter DR and the basis weight of 1x of toilet paper are the same, a lower roll density results in a shorter roll length, and if the roll diameter DR and roll length are the same, a lower roll density results in a lower basis weight of 1x of toilet paper, resulting in a larger amount used per roll). The roll density of 1 toilet roll is 0.17 g / cm³. 3 Beyond that point, the tactile feel of the roll product deteriorates.

[0034] Roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of one toilet roll per 114 mm roll width. Roll volume is expressed as [{cross-sectional area of ​​the outer diameter (winding diameter DR) portion of the roll} - (cross-sectional area of ​​the outer diameter portion of the core)] × roll width (converted to per 114 mm). For example, if the roll mass (excluding core) per 114 mm roll width is 123 g, the winding diameter is 125 mm, and the outer diameter of the core is 39 mm, then the roll density = 0.09 g / cm³ 3 This is the result. If toilet roll 1 does not have a core, the diameter of the central hole will be considered the core outer diameter DI.

[0035] <Toilet paper> The base paper used in toilet paper 1x according to one embodiment of the present invention may consist of 100% by mass of wood pulp, and may also contain recycled paper pulp, non-wood pulp, deinked pulp, recycled liquid beverage carton paper, etc., but from the viewpoint of quality, it is preferable that the content be 50% by mass or less, preferably 30% by mass or less, more preferably 10% by mass or less, and most preferably 0% by mass. In order to obtain the target quality, it is preferable that the content of NBKP (bleached softwood kraft pulp) be 10% by mass or more and 60% by mass or less, more preferably 20% by mass or more and 50% by mass or less, and even more preferably 30% by mass or more and 40% by mass or less. Furthermore, it is preferable that the content of LBKP (bleached hardwood kraft pulp) be 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 even more preferably 60% by mass or more and 70% by mass or less. Furthermore, as additives to the pulp as described above, softeners, bulking agents, dyes, dispersants, dry strength enhancers, water filtration enhancers, pitch control agents, water absorption enhancers, etc., can be used depending on the required quality of the final product. It is preferable not to use wet strength enhancers, but temporary wet strength enhancers may be used.

[0036] The toilet paper 1x according to one embodiment of the present invention is made of two or more plies, preferably two or more plies and three or less, and more preferably two plies. Furthermore, it is preferable for toilet paper 1x with 2 or more plies to be embossed. The embossing can be selected as appropriate from combinations such as double embossing with micro-embossing on the front (1a) and micro-embossing on the back (1b), decorative embossing on the front (1a) and no embossing on the back (1b), decorative embossing on the front (1a) and micro-embossing on the back (1b), single embossing with decorative embossing, or no embossing. The sheets are joined together using glue or knurling (edge ​​embossing) at the same time as or separately from the embossing process.

[0037] (Basic weight) The basis weight of one ply of toilet paper (1x) is 10g / m². 2 More than 30g / m 2 The following is true: 12g / m 2 More than 26g / m 2 Preferably, it is 14 g / m 2 More than 22g / m 2 The following is more preferable: The basis weight of 1x toilet paper is 10g / m². 2 If the basis weight is less than 30g / m², the absorbency of toilet paper 1x will be poor. 2 If it exceeds this amount, it becomes too bulky and the texture is inferior to that of 1x toilet paper. Note that the basis weight of 1x toilet paper is measured according to JIS P 8124.

[0038] (paper thickness) The thickness of one ply of 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. If the paper thickness is less than 100 μm, the feel of the toilet paper 1x will be inferior. If the paper thickness exceeds 320 μm, the roll will become too bulky if the roll diameter DR is within a certain range, and the toilet roll 1 will need to be replaced more frequently. The paper thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measuring load of 3.7 kPa and a probe diameter of 30 mm. The sample is placed between the probe and the measuring stand, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. Five stacks of 2-ply toilet paper (1x) are used to measure the thickness of 10 sheets, and the value is then divided by 10. The measurement is repeated 10 times, and the average of the measurement results is used as the final paper thickness. For 3-ply toilet paper, three stacks are used to measure the thickness of 9 sheets, and for 4-ply toilet paper, three stacks are used to measure the thickness of 12 sheets, and the values ​​are then converted to the value per sheet for calculation.

[0039] (specific volume) Also, the specific volume of 1x toilet paper is 4cm³. 3 / g or more 20cm 3 Preferably less than / g, 5cm 3 / g or more 18cm 3 It is more preferable that it be less than / g, and 6cm 3 / g or more 16cm 3 It is even more preferable that the specific volume be less than or equal to / g. 3 If the amount is less than 20 / g, the absorbency of 1x toilet paper is inferior. Specific volume is 20cm³. 3 When the volume exceeds 1g, the absorbency of 1x toilet paper is good, but it becomes too bulky and easily tears during use. Specific volume is calculated by dividing the paper thickness of 1x toilet paper by the basis weight, and is the volume per gram (cm³). 3 It is represented as follows.

[0040] (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of toilet paper 1x in the MD direction, according to JIS P 8113, is preferably 2.5N / 25mm to 6.5N / 25mm, more preferably 2.7N / 25mm to 5.7N / 25mm, and even more preferably 3.1N / 25mm to 4.5N / 25mm. Furthermore, the dry cross direction tensile strength (DCDT) in the CD direction in the MD direction is preferably 1.1N / 25mm to 3.5N / 25mm, more preferably 1.3N / 25mm to 3.0N / 25mm, and even more preferably 1.4N / 25mm to 2.4N / 25mm. If the DMDT is less than 2.5N / 25mm or the DCDT is less than 1.1N / 25mm, the toilet paper 1x will be prone to tearing during use. If the DMDT exceeds 6.5N / 25mm, or if the DCDT exceeds 3.5N / 25mm, the texture will be inferior to that of 1x toilet paper. In this context, the MD direction and CD direction refer to the manufacturing direction (flow direction) during the production of toilet paper 1x, where the MD direction is the direction perpendicular to the MD direction.

[0041] Furthermore, the ratio of the tensile strength in the MD direction (DMDT) to the tensile strength in the CD direction (DCDT) of toilet paper 1x when dry (DMDT / DCDT) is preferably 1.0 to 3.0, more preferably 1.2 to 2.8, and even more preferably 1.4 to 2.6. By keeping the ratio within the above numerical range, it is possible to produce toilet paper 1x that is less likely to tear during use and has a good feel.

[0042] Furthermore, the square root GMT of the product of the tensile strength in the MD direction (DMDT) and the tensile strength in the CD direction (DCDT) of toilet paper 1x when dry is 1.7 N / 25 mm or more and 4.8 N / 25 mm or less, preferably 1.8 N / 25 mm or more and 4.1 N / 25 mm or less, and more preferably 2.0 N / 25 mm or more and 3.3 N / 25 mm or less. If the GMT is less than 1.7 N / 25 mm, the toilet paper 1x becomes bulky and absorbs too much water, making it prone to tearing during use. If the GMT exceeds 4.8 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 the GMT is calculated as the square root of the product of these tensile strengths. The test specimen width is 25 mm, the tensile speed is 300 mm / min, and the measurement is performed with the product ply count intact.

[0043] (Amount of tensile energy absorbed) The TEA (Tensile Energy Absorption) of 1x toilet paper is 3 J / m². 2 More than 15J / m 2 Preferably, it is 4 J / m 2 More than 11J / m 2 More preferably, the following: 5 J / m 2 More than 9J / m 2 It is even more preferable that TEA is 3 J / m 2 If the TEA is less than 15 J / m, a 1x roll of toilet paper will be bulky, making it difficult to stretch and prone to tearing during use. 2 Beyond that point, the texture is inferior to that of a 1x roll of toilet paper. TEA can be measured using the same method as described above for measuring tensile strength. During measurement, the tensile load and elongation until the test specimen breaks are plotted, and the amount of tensile energy absorbed is calculated from the tensile load-elongation curve. However, the test specimen width is 15 mm and the tensile speed is 50 mm / min, and the measurement is performed using the product's ply count.

[0044] (Water absorption) Furthermore, the water absorption capacity per unit area of ​​1x toilet paper is 200g / m². 2More than 420g / m 2 The following is true: 220g / m² 2 More than 400g / m 2 Preferably, it is 240 g / m². 2 More than 380g / m 2 The following is more preferable: Water absorption per unit area of ​​200 g / m² 2 If it is less than 420 g / m², the absorbency of 1x toilet paper is inferior. 2 Beyond a certain point, while absorbency is good, the increased basis weight results in excessive bulk, making it inferior to the feel of 1x toilet paper. Furthermore, it is preferable that the water absorption per unit weight of toilet paper 1x be 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, and even more preferably 6.8 g / g or more and 9.2 g / g or less. If the water absorption per unit weight is less than 6.0 g / g, the water absorption of toilet paper 1x is poor. If the water absorption per unit weight exceeds 10.0 g / g, the water absorption of toilet paper 1x is good, but it becomes prone to tearing during use. The amount of water absorbed by each section of toilet paper (1x) is measured as follows:

[0045] First, store toilet roll 1 in an environment with a temperature of 23°C and a humidity of 50% for at least 24 hours. Next, take one set (2 plies) of sample material from toilet roll 1, with a size of 80 mm in width and 100 mm in flow direction, and measure its weight. Then, place this sample material on a stainless steel mesh (Tokyu Hands Net Store Eggs Stainless Steel Wire Mesh 10 Mesh 100 mm x 200 mm, wire diameter 0.5 mm; hereafter referred to as the mesh). At this time, ensure that the width direction of the sample (80 mm) is parallel to the mesh size of 100 mm, and that the flow direction of the sample (100 mm) is parallel to the mesh size of 200 mm, so that the sample does not extend beyond the mesh. Next, fill a tray with distilled water to a depth of 1 cm or more. Next, gently submerge the test specimen and mesh in the tray to allow them to be impregnated. At this time, it is acceptable for the test specimen to float on the surface of the water. Ten seconds after impregnation, gently lift the mesh and test specimen into the air, ensuring that the sample does not protrude from the mesh, and let them stand for 10 seconds. Then, tilt the mesh 90 degrees to remove any excess water. At this point, the sample will be attached to the mesh, so it will not fall out even when tilted 90 degrees. When tilting 90 degrees, ensure that the vertical direction of the sample is aligned with the direction of sample flow. Then, leave it undisturbed for 120 seconds at a 90-degree angle. After 120 seconds, peel the sample from the mesh and measure its weight. For 2-ply samples, calculate the amount of water absorbed from the sample weight before impregnation and the sample weight after impregnation (see example below). Repeat the measurement 5 times and average the values. All of the above procedures should be performed in an environment with a temperature of 23°C and a humidity of 50%. When taking samples, take them from the part that does not have perforations. If the perforation interval is 100 mm or less, the sample may include the perforations. (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 (g water / 0.008 m of paper) 2 ) = 220g / m 2 (1m 2 (Amount of water absorbed per unit) Water absorption = (Sample weight after impregnation) - (Sample weight before impregnation) = 1.76 (water g / paper 0.32 g) = 5.5 g / g (Water absorption per gram = (1 m 2 (Water absorption per unit area / Basis weight of 2-ply)

[0046] (Measurements taken by TSA) In a toilet roll 1 according to one embodiment of the present invention, a tissue softness measuring device (TSA) is used to press a bladed rotor onto a sample of toilet paper 1x placed on a sample stage with a pressing pressure of 100 mN, and then rotate it at a rotation speed of 2.0 ( / sec). When the vibration of the sample stage is measured with a vibration sensor, the intensity of the first spectral maximum peak from the low-frequency side, automatically acquired by the software on the TSA (TS750), is 16 dBV. 2 RMS or higher, 41 dBV 2 Preferably, it should be rms or less, and 17.5 dBV 2 rms over 35dBV 2 It is more preferable that it be less than or equal to rms, and 19 dBV 2 rms over 30dBV 2 It is even more preferable that it be below rms. TS750 is 16dBV 2 If the RMS is below 41 dBV, the strength of a 1x roll of toilet paper decreases, making it more prone to tearing when it absorbs water. TS750 is 41 dBV 2 Above the RMS level, the texture is inferior to that of 1x toilet paper.

[0047] Furthermore, among the spectra obtained by TSA, the intensity of the maximum peak in the spectrum containing 6500 Hz (TS7) was 6 dBV. 2 rms over 20dBV 2 Preferably, it should be rms or less, and 7dBV 2 rms over 17dBV 2 It is more preferable that it be less than or equal to rms, and 8 dBV 2 rms over 14dBV 2 It is even more preferable that the RMS is less than or equal to TS7 at 6dBV. 2 If the RMS value is below 20 dBV, the strength of a 1x roll of toilet paper will be reduced, making it more prone to tearing when it absorbs water. 2 Above the RMS level, the texture is inferior to that of 1x toilet paper.

[0048] Furthermore, in a toilet roll 1 according to one embodiment of the present invention, when a sample of toilet paper 1x placed on a sample stage is pressed down from above with pressing pressures of 100mN and 600mN by TSA without rotating the rotor with blades, the measured value of stiffness (D), which is represented by the amount of vertical deformation displacement of the sample between pressing pressures of 100mN and 600mN, is preferably 1mm / N or more and 4mm / N or less, more preferably 1.4mm / N or more and 3.7mm / N or less, and even more preferably 1.6mm / N or more and 3.4mm / N or less. If the measured value of D is less than 1mm / N, the feel of the toilet paper 1x is inferior. If the measured value of D exceeds 4mm / N, the toilet paper 1x becomes bulky and absorbs too much water, making it prone to tearing during use.

[0049] The TS7, TS750, and D values ​​in this example are measurements of 2-ply toilet paper taken with a tissue softness analyzer (TSA, manufactured by emtec). A lower TS7 value indicates superior softness and fluffiness (surface softness and bulk softness), a lower TS750 value indicates superior smoothness, and a higher D value indicates superior flexibility.

[0050] The measurement methods for TS7, TS750, and D using the tissue softness measuring device TSA, as well as the measuring device used, are described in detail, for example, in Japanese Patent Publication No. 2013-236904. For various measurement methods using the tissue softness measuring device TSA, please refer to the above-mentioned patent document.

[0051] <Method of manufacturing toilet rolls> Regarding the manufacturing process for toilet paper 1x and toilet roll 1, they can be produced by stacking base paper after the papermaking process, embossing if necessary, and then winding it onto a roll. Alternatively, the base paper may be embossed before stacking and winding it onto a roll. Furthermore, it is preferable that toilet paper 1x be manufactured by the TAD papermaking method. The TAD papermaking method is a method of air-drying the wet paper without pressing and dewatering it during the dewatering and drying process of the papermaking process. By manufacturing using the TAD papermaking method, it is possible to produce toilet paper 1x that is bulky, soft, and has excellent water absorption. In addition, it is preferable that toilet paper 1x be dry-crepe processed. By dry-crepe processing, it is possible to produce toilet paper 1x that is bulky, has a good feel, and has excellent water absorption.

[0052] As described above, according to this embodiment, a toilet roll 1 can be provided that is made by winding bulky toilet paper of 2 plies or more into a roll shape, and that has good water absorption, resistance to tearing during use, and a good feel for both the sheet and the roll, and that does not require frequent replacement. [Examples]

[0053] The present invention will be described in more detail by the following examples and comparative examples, but the present invention is not limited in any way by the following examples.

[0054] Toilet paper (sheets) and toilet rolls for Examples 1-15 and Comparative Examples 1-9 were prepared under the conditions shown in Tables 1 and 2, and evaluated as follows. Each evaluation was performed after maintaining equilibrium under the temperature and humidity conditions specified in JIS P8111 (23±1℃, 50±2%RH). In addition, parameters other than those evaluated below were performed according to the standards or measurement methods described above.

[0055] (The feel of the seat) Thirty monitors evaluated the tactile feel (softness and smoothness) of toilet paper (sheets) when touched directly with their hands. The evaluation was then given on a 5-point scale based on the number of monitors who rated the tactile feel as good. ◎: More than 28 monitors rated the texture as good. ○: 24-27 monitors rated the product as having a good tactile feel. △: 18-23 monitors rated the product as having a good tactile feel. ×: 13-17 monitors rated the texture as good. ××: Fewer than 12 monitors rated the texture as good.

[0056] (Water absorption) The water absorption rate (per unit area) was measured and evaluated as described above. The evaluation criteria were based on the following four levels. ◎: Water absorption capacity is 240g / m² 2 That's all. ○: Water absorption capacity of 220-239 g / m² 2 △: Water absorption capacity of 200-219 g / m² 2 ×: Water absorption capacity is 199g / m² 2 below

[0057] (Resistant to tearing during use) Thirty monitors evaluated the heated toilet seat by wiping away water with toilet paper (or a toilet paper wipe) after use. The evaluation was based on the number of monitors who found the toilet paper to be tear-resistant, and was given on a 5-point scale. ◎: More than 28 monitors rated it as tear-resistant. ○: 24-27 monitors rated it as tear-resistant. △: 18-23 monitors rated it as tear-resistant. ×: 13-17 monitors rated it as tear-resistant. ××: Fewer than 12 monitors rated it as tear-resistant.

[0058] (The feel of the roll product) Thirty monitors evaluated the tactile feel of the toilet paper roll (product) by touching it directly with their hands. The product was rated on a four-point scale based on the number of monitors who rated the tactile feel as good. ◎: More than 28 monitors rated the texture as good. ○: 24-27 monitors rated the product as having a good tactile feel. △: 18-23 monitors rated the product as having a good tactile feel. ×: Fewer than 17 monitors rated the texture as good.

[0059] (Infrequent replacement) Thirty monitors measured the time it took to use up one roll of toilet paper (sheets) and evaluated how often the roll needed to be replaced (a lower replacement frequency means the roll lasts longer). The evaluation was then rated on a four-point scale based on the number of monitors who rated the roll replacement frequency as low. ◎: More than 28 monitors rated the replacement frequency as low. ○: 24-27 monitors rated the replacement frequency as low. △: 18-23 monitors rated the replacement frequency as infrequent. ×: Fewer than 17 monitors rated the replacement frequency as infrequent.

[0060] Table 1 shows the conditions and evaluation results for each example, and Table 2 shows the conditions and evaluation results for each comparative example. A product is considered acceptable if its evaluation score is △ or higher.

[0061] [Table 1]

[0062] [Table 2]

[0063] Based on the above, it has been confirmed that, according to this embodiment, a toilet roll can be obtained in which bulky toilet paper of 2 plies or more is wound into a roll, and which has good water absorption, resistance to tearing during use, and a good feel for both the sheet and the roll, and which also has a low replacement frequency. [Explanation of Symbols]

[0064] 1 toilet roll 1a surface 1b back side 1e Toilet paper outermost edge 1 x Toilet Paper

Claims

1. A toilet roll made by winding toilet paper with two or more plies into a roll shape, The toilet paper described above has a GMT (Gross Motif), which is the square root of the product of the tensile strength in the MD direction and the tensile strength in the CD direction when dry, between 1.7 N / 25 mm and 4.8 N / 25 mm, and a water absorption capacity of 200 g / m² per unit area. ２ 420g / m or more ２ Below, the basis weight per ply is 10 g / m². ２ 30g / m or more ２ The following: The roll density of the roll is 0.05 g / cm². ３ 0.17g / cm or more ３ A toilet roll characterized by the following:

2. The TEA (Tensile Energy Absorption) of the aforementioned toilet paper is 3 J / m ２ 15J / m or more ２ The toilet roll according to claim 1, characterized in that it is as follows.

3. The specific volume of the toilet paper is 4 cm ３ / g or more and 20 cm ３ / g or less, and the toilet roll according to claim 1 is characterized by this.

4. The toilet roll according to claim 1, characterized in that the thickness of one ply of the toilet paper is 100 μm or more and 320 μm or less.

5. The toilet roll according to claim 1, characterized in that the roll has a winding diameter of 100 mm or more and 150 mm or less.

6. The toilet roll according to claim 1, characterized in that the length of the roll is 17m or more and 44m or less.

7. Using a tissue softness measuring device (TSA), a rotor with blades was pressed down onto a sample of toilet paper placed on a sample stage with a pressing pressure of 100 mN, and then rotated at a rotation speed of 2.0 ( / sec). When the vibration of the sample stage was measured with a vibration sensor, the intensity of the first spectral maximum peak from the low-frequency side (TS750), automatically acquired by the software on the TSA, was 16 dBV. ２ rms or higher, 41 dBV ２ The toilet roll according to claim 1, characterized in that it is less than or equal to rms.

8. Of the spectra obtained by the aforementioned TSA, the intensity of the maximum peak in the spectrum containing 6500 Hz (TS7) is 6 dBV. ２ rms or more 20dBV ２ The toilet roll according to claim 7, characterized in that it is less than or equal to rms.

9. The toilet roll according to claim 7, characterized in that, when the TSA presses down on the toilet paper sample placed on the sample stage with pressing pressures of 100 mN and 600 mN from above, respectively, without rotating the rotor with blades, the measured value of stiffness (D), which is represented by the amount of vertical deformation displacement of the sample between pressing pressures of 100 mN and 600 mN, is 1 mm / N or more and 4 mm / N or less.

10. The toilet roll according to claim 1, characterized in that the amount of water absorbed per unit weight of the toilet paper is 6.0 g / g or more and 10.0 g / g or less.

11. The toilet roll according to claim 1, characterized in that the toilet paper is dry crepe processed.

12. A method for manufacturing a toilet roll according to claim 1, characterized in that the toilet paper is manufactured by the TAD papermaking method.

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