Toilet roll and manufacturing method of the same

Abstract

To provide a toilet roll for which space saving is planned for a long wound length, storage, etc. and which is excellent in both feeling of the toilet paper and adhesiveness of the paper sleeve in the starting end and terminal end and of the roll circumference.SOLUTION: In a toilet roll, 2 ply toilet paper is wound around a paper sleeve in a roll shape, and the wound length of the toilet roll is 33 m or more and 100 m or less, with the wound diameter 100 mm or more and 134 mm or less. The basis weight per 1 sheet is 11 g / m2 or more and 16 g / m2 or less. A TS7 outer face, which is strength (TS7 value) of the maximum peak of a spectrum containing a frequency 6500 Hz and which is obtained by a tissue softness measuring apparatus TSA when rotated by a push-in tension 100 mN, revolution 2.0 per second and measured by a vibration sensor, is 13 dBV2 or more and 20 dBV2 or less, and a TS7 inner face is larger than the TS7 outer face, in the toilet roll.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a toilet roll in which two-ply toilet paper, each consisting of two overlapping sheets, is wound around a paper tube into a roll, and to a method for manufacturing the same. [Background technology]

[0002] In toilet rolls, which are toilet paper wound into a roll, the length of each roll is increased to save space when transporting and storing the roll. In this case, if the diameter of the roll is to be kept within a specified dimension so that it can be rotatably supported by a general toilet roll holder, it becomes necessary to reduce the paper thickness, which can impair the texture and feel of the toilet paper.

[0003] In response to this, Patent Document 1 focuses on the softness of toilet paper in a toilet roll in which two plies of toilet paper are wound into a roll, and sets the TS7 value measured by a tissue softness measuring device TSA on the toilet paper surface on the outside of the roll to 13 to 22 dBV. 2 By using rms, we are able to offer a toilet roll with a long roll length and excellent texture.

[0004] In general, in this type of toilet roll, the toilet paper is wound around a paper tube. During production, one end (starting end) of the toilet paper is adhered to the paper tube with pick-up glue, and after a predetermined length is wound around the paper tube, the other end (ending end) is adhered to the outer periphery of the roll with tail seal glue. This prevents the ending end of the toilet paper from coming apart before use begins, and prevents the starting end of the toilet paper from coming off the paper tube before use ends. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6262439 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the toilet paper is softened as described above to improve the texture, the toilet paper's organizational structure generally promotes the penetration of the pickup glue into the starting end of the toilet paper when the starting end of the toilet paper is bonded to the paper tube. Similarly, when the end of the toilet paper is bonded to the outer periphery of the roll, the penetration of the tail seal glue into the outer periphery of the roll is promoted. This reduces the amount of glue (adhesive) that contributes to adhesion between the starting end of the toilet paper and the paper tube and between the end of the toilet paper and the outer periphery of the roll, reducing the adhesiveness, resulting in the problem that the toilet paper may inadvertently peel off from the outer periphery of the roll and fall apart before the toilet roll begins to be used, or the toilet paper may inadvertently peel off from the paper tube and fall off before the toilet roll is finished being used.

[0007] The present invention aims to provide a toilet roll that has a long winding length per roll, which allows for space-saving transport and storage, and that has excellent texture and adhesiveness at the beginning and end of the toilet roll, as well as a manufacturing method thereof. [Means for solving the problem]

[0008] As a result of intensive research to solve the above problems, the present inventors have discovered a toilet roll in which two-ply toilet paper, each of which is made up of two overlapping sheets, is wound around a paper tube in a roll shape, the toilet roll having a roll length of 33 m or more and 100 m or less, a roll diameter of 100 mm or more and 134 mm or less, and a basis weight per sheet of 11 g / m 2 More than 16g / m 2The tissue softness measuring device TSA is used to measure the vibration of a toilet paper sample placed on a sample stage with the outer side of the roll facing up. The sample is then pressed from above with a bladed rotor at a pressure of 100mN, and rotated at a speed of 2.0 revolutions per second. The TS7 outer surface, which is the intensity of the maximum peak (TS7 value) of the spectrum containing a frequency of 6500Hz, is 13dBV or less. 2 rms over 20dBV 2 It was discovered that the above problem can be solved by using a toilet roll with a TS7 inner surface, which is the intensity of the maximum peak (TS7 value) of the spectrum including a frequency of 6,500 Hz obtained when a toilet paper sample is placed on a sample stage with the inner side of the roll facing up, using a tissue softness measuring device (TSA), and a bladed rotor is pressed from above with a pressing pressure of 100 mN and then rotated at a speed of 2.0 revolutions per second, and the vibration of the sample stage is measured with a vibration sensor.The TS7 inner surface is greater than the TS7 outer surface, and it has been found that the above problem can be solved by using a toilet roll with a TS7 inner surface.

[0009] Specifically, the present invention has the following configuration.

[0010] [1] A toilet roll in which two sheets of toilet paper are overlapped and wound into a roll around a paper tube, The length of the toilet roll is between 33m and 100m, and the diameter of the roll is between 100mm and 134mm. The basis weight per sheet is 11g / m 2 More than 16g / m 2 is as follows: Using the tissue softness measuring device TSA, a toilet paper sample is placed on the sample stage with the outer side of the roll facing up. A bladed rotor is pressed from above with a pressure of 100mN, then rotated at a speed of 2.0 revolutions per second. The vibration of the sample stage is measured with a vibration sensor. The TS7 outer surface, which is the intensity of the maximum peak (TS7 value) of the spectrum containing a frequency of 6500Hz, is 13dBV. 2 rms over 20dBV 2is less than or equal to rms, A toilet roll characterized in that the TS7 inner surface, which is the intensity of the maximum peak (TS7 value) in the spectrum including a frequency of 6500 Hz obtained when a toilet paper sample is placed on a sample stage with the inner side of the roll facing up using a tissue softness measuring device TSA, is pressed from above with a bladed rotor at a pressure of 100 mN and then rotated at a speed of 2.0 revolutions per second and the vibration of the sample stage is measured with a vibration sensor, is greater than the TS7 inner surface.

[0011] [2] The toilet roll according to [1], characterized in that the toilet paper is made up of two sheets of different paper qualities.

[0012] [3] The toilet roll according to [1] or [2], characterized in that the toilet roll has two sheets each of which has an embossing pattern with different embossing conditions formed over the entire surface of the sheet, and the two sheets are overlapped so that the embossed recesses of each sheet are located on both sides of the toilet roll.

[0013] [4] The toilet roll according to [1] or [2], characterized in that the toilet paper has a single embossing across the entire surface of the paper and is wound so that the embossed recesses are on the outside of the roll.

[0014] [5] The toilet roll according to any one of [1] to [4], characterized in that the ratio R of the TS7 inner surface to the TS7 outer surface (TS7 inner surface / TS7 outer surface) is 1.01 or more and 2.20 or less.

[0015] [6] A toilet roll in which two sheets of toilet paper are overlapped and wound around a paper tube into a roll, The length of the toilet roll is between 33m and 100m, and the diameter of the roll is between 100mm and 134mm. Using the tissue softness measuring device TSA, a toilet paper sample is placed on the sample stage with the outer side of the roll facing up. A bladed rotor is pressed from above with a pressure of 100mN, then rotated at a speed of 2.0 revolutions per second. The vibration of the sample stage is measured with a vibration sensor. The TS7 outer surface, which is the intensity of the maximum peak (TS7 value) of the spectrum containing a frequency of 6500Hz, is 13dBV. 2 rms over 20dBV 2 is less than or equal to rms, A method of manufacturing a toilet roll, comprising the steps of: placing a toilet paper sample on a sample stage with the inner side of the roll facing up using a tissue softness measuring device TSA; pressing a bladed rotor from above with a pressing pressure of 100 mN onto the sample stage, rotating the sample at a rotation speed of 2.0 per second, and measuring the vibration of the sample stage with a vibration sensor; obtaining the intensity of the maximum peak (TS7 value) of a spectrum including a frequency of 6500 Hz; and determining whether the TS7 inner surface is greater than the TS7 outer surface; The method includes a forming step of forming a two-ply toilet paper by overlapping two sheets, and a winding step of winding the formed two-ply toilet paper into a roll around a paper tube with a predetermined length and a predetermined winding diameter, The forming process is TS7 outer surface 13dBV 2 rms over 20dBV 2 rms and the TS7 inner surface is larger than the TS7 outer surface. (1) A non-embossing process in which two sheets of different paper quality are used and the two sheets are overlapped without embossing the entire surface of each of the two sheets; (2) A double embossing process in which two sheets of the same or different paper quality are used, and the entire surface of each of the two sheets is embossed under different embossing conditions before the two sheets are superimposed; (3) A single embossing process in which two sheets of the same or different paper quality are used, the two sheets are stacked together, and the entire surfaces of the two sheets are embossed at the same time. The method includes a step selected from the following: The winding process includes a process of winding the leading end of the formed two-ply toilet paper around a paper core via an adhesive, and a process of gluing the trailing end of the formed two-ply toilet paper to the surface of the roll with an adhesive. A method for producing a toilet roll comprising the steps of: Effect of the Invention

[0016] According to the present invention, it is possible to provide a toilet roll that has a long winding length per roll, which allows for space saving during transport and storage, and that is excellent in both texture and adhesiveness at the beginning and end of the toilet paper. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing an example of the configuration of a toilet roll according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view of the tissue softness measuring device TSA. [Diagram 3] 2 is a schematic cross-sectional view of an example of a sample measured by the measuring device TSA. [Figure 4] FIG. 2 is a diagram illustrating the measurement principle of the measurement device TSA. [Diagram 5] FIG. 2 is a diagram illustrating the measurement principle of the measurement device TSA. [Figure 6] FIG. 13 is a diagram showing an example of a measurement result obtained by the measurement device TSA. [Figure 7] FIG. 1 is a schematic diagram showing an example of a manufacturing facility applicable to the manufacture of toilet rolls. [Figure 8] FIG. 2 is a schematic diagram showing a configuration example of a gluing device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The toilet roll according to the embodiment of the present invention will be described with reference to the drawings. The following embodiments and drawings are provided for illustrative purposes and are not intended to limit the present invention.

[0019] (First embodiment) (Toilet roll) FIG. 1 is a schematic perspective view illustrating an example of the configuration of a toilet roll according to an embodiment of the present invention.

[0020] Referring to FIG. 1, a toilet roll 10 according to an embodiment of the present invention is a so-called two-ply toilet paper 13, consisting of two overlapping sheets 11 and 12, wound into a roll by a predetermined length around a paper tube 14, which is a cylindrical core.

[0021] (Sheet) Each of the two sheets 11, 12 that constitute the toilet paper 13 is obtained by papermaking a slurry that contains a pulp component, which is a fiber raw material.

[0022] (Pulp component) Examples of the pulp component 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). Examples of the wood pulp include semi-chemical pulps such as semi-chemical pulp (SCP) and chemi-ground wood pulp (CGP), groundwood pulp (GP), and thermomechanical pulp (TMP, BCTMP), but are not limited thereto. Examples of the non-wood pulp include cotton pulps such as cotton linters and cotton lint, non-wood pulps such as hemp, straw, and bagasse, and cellulose, chitin, and chitosan isolated from sea squirts and seaweed, but are not limited thereto. Examples of deinked pulp include, but are not limited to, deinked pulp made from recycled paper. The pulp components may be one of the above, or may be a mixture of two or more. These pulp components have a significant effect on the quality of the toilet paper 13, so they are appropriately mixed in a predetermined type and ratio according to the required quality.

[0023] For example, at least one selected from softwood pulp and hardwood pulp can be preferably used as the pulp component. Softwood pulp has long and strong fibers, and can impart strength to the tissue paper produced. Hardwood pulp has short and flexible fibers, and can provide uniformity, good texture, softness, and the like to the tissue paper produced. In an embodiment of the present invention, it is preferable to use softwood pulp and hardwood pulp in combination, and it is more preferable to use softwood kraft pulp (NKP) and hardwood kraft pulp (LKP) in combination.

[0024] When softwood pulp and hardwood pulp are used in combination as the pulp component, the L / N ratio, which indicates the blending ratio (mass ratio) of softwood pulp to hardwood pulp, is, for example, preferably 10 / 90 to 90 / 10, more preferably 20 / 80 or more, even more preferably 30 / 70 or more, and more preferably 80 / 20 or less, and even more preferably 70 / 30 or less.

[0025] (optional ingredient) Various chemicals may be added to the sheets 11 and 12 as optional components to achieve the required quality and stabilize operation. Examples of optional components include dry strength agents, wet strength agents, softeners, bulking agents, dyes, fragrances, dispersants, drainage improvers, pitch control agents, retention improvers, sizing agents, and the like. Examples of dry strength agents include cationic starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC), and the like. Examples of wet strength agents include polyamide epichlorohydrin, urea, melamine, thermally crosslinked polyacrylamide, and the like. Examples of softeners include anionic surfactants, nonionic surfactants, cationic surfactants, and zwitterionic surfactants, and the like. The above optional components may be used alone or in combination of two or more.

[0026] In the embodiment of the present invention, the types (paper quality such as material and physical properties) of the two sheets 11, 12 to be overlapped with each other may be the same or different depending on the required quality and the like.

[0027] One end (starting end) of the toilet paper 13 is adhered and fixed to the outer periphery of the paper tube 14 by pick-up glue (not shown). The other end (ending end) of the toilet paper 13 is adhered and fixed to the outer periphery of the toilet roll 10 by tail seal glue. Hereinafter, the adhesive part on the starting end side of the toilet paper 13 will be referred to as the starting end, and the adhesive part on the ending end side will be referred to as the ending end 15. Adhesion of the starting end and the ending end 15 prevents the toilet paper 13 from peeling off and detaching from the paper tube 14, or from peeling off from the outer periphery of the roll and falling apart.

[0028] (Paper tube) The cardboard tube 14 has a cylindrical shape, around which the toilet paper 13 is wound to form the toilet roll 10. The core diameter DC, which is the outer diameter of the cardboard tube 14, is set according to the size of the components (core, hooks, etc.) of the toilet roll holder that support the rotation of the toilet roll 10, and is generally around 38 mm to 40 mm.

[0029] The material of the cardboard tube 14 may be any material that can be applied to its outer circumferential surface, pick up and glue the beginning end of the toilet paper 13, and wind the toilet paper 13, and is often made of cardboard such as cardboard tube base paper, cardboard base paper, or kraft paper. The cardboard tube 14 may be made of a strip of paper wound in a spiral shape, for example.

[0030] (Pickup glue) The pick-up glue is an adhesive for adhering and fixing the beginning end of the toilet paper 13 to the outer circumferential surface of the paper tube 14. The type of adhesive is not particularly limited, but it is preferable that the adhesive is capable of quickly adhering and fixing the toilet paper 13 and has an adhesive strength that can withstand the tensile force when the toilet paper 13 is wound up. As such an adhesive, a water-soluble adhesive is preferable, and a cellulose derivative adhesive is more preferable. Among commercially available cellulose derivative adhesives, for example, Kanebinol TV976 and Kanebinol TV986 (both trade names, manufactured by Nippon NSC Co., Ltd.) are preferably used because they have strong wet tack and excellent pick-up properties.

[0031] (Tail seal glue) The tail seal glue is an adhesive for adhering and fixing the end 15 of the toilet paper 13 to the outer peripheral surface of the roll. The type of adhesive for the tail seal glue is not particularly limited, and it is preferable that the adhesive is an adhesive that can quickly adhere and fix the toilet paper 13 and has an adhesive strength that does not easily peel off. As such an adhesive, a water-soluble adhesive is preferable, and a cellulose derivative adhesive is more preferable. Among commercially available cellulose derivative adhesives, for example, Kanebinol TV995 and Kanebinol TV907 (both trade names, manufactured by Nippon NSC Co., Ltd.) are preferably used because they have strong wet tack and excellent drying properties.

[0032] (Toilet roll length) In an embodiment of the present invention, the wound length of the toilet roll 10, which is the length of the toilet paper 13 wound around the paper tube 14, is 33 m or more and 100 m or less. The wound length can be determined, for example, by actually measuring the length of the toilet paper 13 while unwinding it from the toilet roll 10.

[0033] When the roll length of the toilet roll 10 is within this range, the length of the toilet paper 13 per roll is long, making it possible to save space when carrying or storing the toilet roll 10. When the roll length of the toilet roll 10 exceeds 100 m, the roll diameter of the toilet roll 10 generally becomes large, making it difficult for the toilet roll 10 to fit into a typical toilet roll holder. Also, when the roll length of the toilet roll 10 is less than 33 m, the roll length per roll is short, making it difficult to save space when carrying or storing the toilet roll 10.

[0034] (Toilet roll diameter) In an embodiment of the present invention, the roll diameter DR of the toilet roll 10, which is the roll diameter of the toilet paper 13 wound into a roll, is 100 mm or more and 134 mm or less. The roll diameter DR can be measured using, for example, a vernier caliper.

[0035] When the roll diameter DR of the toilet roll 10 is within this range, the toilet roll 10 can be accommodated in a typical toilet roll holder and supported therein so as to be freely rotatable. When the roll diameter DR of the toilet roll 10 is greater than 134 mm, the toilet roll 10 will have difficulty being accommodated in a typical toilet roll holder. Furthermore, when the roll diameter DR of the toilet roll 10 is smaller than 100 mm, the roll length of the toilet roll 10 is limited, making it difficult to save space during transport or storage by increasing the roll length.

[0036] The winding diameter DR of the toilet roll 10 can vary depending on the winding length of the toilet roll 10, the basis weight of the toilet paper 13, and the paper thickness and bulkiness of the toilet paper 13 due to calendaring, embossing, and other processes in the manufacturing process of the toilet roll 10. If an attempt is made to ensure a long winding length of the toilet roll 10 with a small winding diameter DR, the paper thickness and bulkiness of the toilet paper 13 and the basis weight of the constituent sheets 11 and 12 will be limited, making it difficult to ensure a good feel in use and strength.

[0037] (toilet paper) The toilet paper 13 is a so-called two-ply toilet paper, and has the form of a laminated sheet in which two sheets 11 and 12 are overlapped.

[0038] (grammage per sheet) In the embodiment of the present invention, the basis weight of each of the two sheets 11 and 12 constituting the toilet paper 13 is 11 g / m 2 More than 16g / m 2 The basis weight per sheet can be calculated by measuring the basis weight of the two-ply toilet paper 13 and dividing the basis weight by 2, the number of plies, in accordance with the provisions of Japanese Industrial Standard JIS P8124. That is, the two-ply toilet paper 13 is conditioned according to the method specified in Japanese Industrial Standard JIS P8111, and the conditioned two-ply toilet paper 13 is cut into a predetermined size, for example, 10 cm x 10 cm, while the two sheets 11, 12 are still stacked, and the weight of the cut-out two-ply toilet paper 13 is measured, and the weight is multiplied by 0.01 m of the cut-out area of ​​the two-ply toilet paper 13. 2 The basis weight of the two-ply toilet paper 13 is measured by dividing the basis weight by 2, the number of plies, to obtain the basis weight per sheet.

[0039] The basis weight per sheet is 11g / m 2 If it is less than this, the strength will be low and the feeling of use will be poor due to the reduced water absorption, etc. The basis weight per sheet is 16 g / m 2 If the thickness exceeds this range, the paper will generally become thicker and the roll diameter of the toilet roll 10 will become larger. If the roll diameter of the toilet roll 10 is to be kept within the above range, it will be difficult to ensure the roll length of the toilet roll 10. Furthermore, if a roll length within the above range is to be obtained, it will be necessary to reduce the thickness of the sheets 11, 12, which may cause the sheets 11, 12 to become crushed and the texture of the toilet paper 13 to be impaired.

[0040] In the configuration example of the first embodiment shown in FIG. 1, the toilet paper 13 is embossed.

[0041] (Embossed) Embossing refers to a process in which an embossed convex portion is formed on one of the two surfaces of a sheet to be embossed, and an embossed concave portion formed by the back side of the embossed convex portion is formed on the other surface. Embossing can be performed by a known method. For example, embossing may be performed by a "matched" embossing roll in which a male (convex) embossing roll and a female (concave) embossing roll of approximately complementary shapes mesh together, or by a so-called "mismatched" embossing roll in which the male (convex) embossing roll and the female (concave) embossing roll are not identical in shape and apply a shear force to the sheet when they mesh together, or by a male (convex) embossing steel roll and a plain rubber roll.

[0042] The embossing in the configuration example of the first embodiment is so-called double embossing. That is, in the toilet paper 13, the sheets 11 and 12 are each embossed and then superimposed on each other. In this example, the sheet 11 on the outside of the toilet roll 10 has a number of first embossed portions 11a formed in a repeating pattern over the entire surface (whole surface) of the sheet 11, which is the outer side of the roll. Also, the sheet 12 on the inside of the roll has a number of second embossed portions (not shown) formed in an aligned state at predetermined intervals over the entire surface of the sheet 11 so as to protrude toward the surface that overlaps with the sheet 12.

[0043] In this way, in the first embodiment, both the first embossed portion 11a and the second embossed portion are protruded toward the overlapping surface side of the sheets 11 and 12, and embossed recesses are provided on both sides of the toilet paper 13, so that the feel of both sides of the toilet paper 13, i.e., the feel of the surface of the sheet 11 that is the outside of the roll and the feel of the surface of the sheet 12 that is the inside of the roll, are improved. In addition, by making the pattern of the first embossed portion 11a of the sheet 11 and the pattern of the second embossed portion of the sheet 12 different, the texture of the surface of the sheet 11 that is the outside of the roll (i.e., the outer surface of the toilet paper 13) and the texture of the surface of the sheet 12 that is the inside of the roll (i.e., the inner surface of the toilet paper 13) are made different. Note that the pattern of the first embossed portion 11a and the pattern of the second embossed portion may be any pattern other than those described above, as necessary.

[0044] In addition, in order to prevent the sheets 11 and 12 constituting each layer of the toilet paper 13 from peeling off, the toilet paper 13 may be provided with a bonding embossed portion (not shown) for bonding the constituent sheets 11 and 12 to each other. The bonding embossed portion defines a bonding area that bonds the sheets 11 and 12 together. The bonding embossed portion may be formed, for example, on both side edges in the width direction (CD direction) of the toilet paper 13 so as to extend along its longitudinal direction (MD direction), and is also called an edge embossment. The bonding embossed portion may be formed so as not to protrude outward in the thickness direction from both the front and back sides of the toilet paper 13.

[0045] (TS7 value obtained by tissue softness measuring device TSA) In an embodiment of the present invention, the TS7 values ​​obtained by a tissue softness measuring device TSA (hereinafter, also simply referred to as the measuring device TSA) are specified for both sides of the toilet paper 13. Before describing the specific range of the TS7 value according to the embodiment of the present invention, the tissue softness measuring device TSA, the measurement principle, and the measurement procedure used to obtain the TS7 value will be described with reference to Figs. 2 to 6.

[0046] (Tissue Softness Measurement Device TSA) 2 is a schematic cross-sectional view of a tissue softness measuring device TSA manufactured by Emtec Electronic GmbH, Germany, which can be used to obtain a TS7 value according to an embodiment of the present invention. The measuring device TSA is available from Nippon Luft Co., Ltd. (a distributor in Japan).

[0047] The human feel (touch) when touching toilet paper 13 is affected by three characteristics of toilet paper 13: "softness," "smoothness / roughness," and "rigidity." The measuring device TSA is a device that can digitize parameters (referred to as TS7, TS750, and D, respectively) that are indicators of these three characteristics through acoustic and deformation measurements. The measuring device TSA can calculate a value called the hand feel (HF) value by performing an analysis using an algorithm based on these obtained parameters (raw data) and the basis weight, thickness, number of plies, etc. of the toilet paper 13. The HF value is a value used for a comprehensive quantitative evaluation of the touch of toilet paper 13, correlated with the results of human touch (panel test).

[0048] Of the parameter values ​​mentioned above, TS7 (softness), TS750 (smoothness / roughness), and D (stiffness), the TS7 and TS750 values ​​can be obtained by acoustic measurement using the tissue softness measuring device TSA.

[0049] (Principle of Acoustic Measurement by Tissue Softness Analyzer TSA) The measurement principle of acoustic measurement by the tissue softness measuring device TSA will be described with reference to Figs.

[0050] FIG. 3 is a schematic cross-sectional view showing an example of a sample of toilet paper 13 to be measured by the tissue softness measuring device TSA. In an embodiment of the present invention, the sample 23 to be measured by the measuring device TSA 20 is a two-ply toilet paper 13 consisting of two sheets 11 and 12, but in FIG. 3, the sample 23 is shown generally as a single sheet. The sample 23 has an uneven texture. In addition, the surface of the sample 23 has raised naps, which are protruding portions originating from the constituent fibers 23f. Raised naps are also called fiber fluff, and the roots of the raised fibers are present on the surface or inside of the sample 23.

[0051] 2(a), in the tissue softness measuring device TSA 20, a vibration sensor 21a is provided inside a sample stage 21, and a bladed rotor 25 that rotates a blade 25a by a motor 25b is provided above the sample stage 21. The sample 23 is attached to the sample stage 21 like a drum head, with the surface to be measured facing upwards, i.e., with the measurement surface facing the bladed rotor 25.

[0052] In the first measurement step, the bladed rotor 25 is moved vertically downward, and the blade 25a presses the specimen 23 with a set load, as shown in FIG. 2(b). Then, at the constant vertical position, the blade 25a is rotated at a set speed. The horizontal movement of the blade 25a on the specimen 23 caused by this generates different types of vibrations and noises. The generated vibrations and noises are detected by the vibration sensor 21a. The detected vibrations and noises are analyzed for frequency using a PC to obtain the TS7 value. For example, by using the emtec measurement system, which is software from Emtec, the TS7 value can be automatically obtained on the software.

[0053] In detail, referring to Fig. 4, during measurement by the measuring device TSA 20, the blade 25a is moved horizontally at a constant vertical position, as illustrated by the movement from position (1) to (3) in the figure. Such horizontal movement of the blade 25a causes the position of the sample 23 to vary, inducing vertical vibration of the sample 23. The induced vibration frequency depends on the structural dimensions of the toilet paper 13 (e.g. dimensions resulting from creep, embossment, etc.) and the rotation speed of the blade 25a. The amplitude (strength) of the vibration depends on the height of the structure.

[0054] 5, during the above-mentioned measurement by the measuring device TSA 20, the blade 25a, which is moved horizontally at a constant vertical position, advances horizontally on the surface of the sample 23, as exemplified by the movement from position (i) to (iii) in the figure. At this time, the blade 25a is momentarily interrupted by contact with the fiber 23f protruding from the sample surface, and due to the vibration of the blade 25a, horizontal vibration of the blade 25a itself is induced.

[0055] In comparison with FIG. 5(a), in FIG. 5(b), the fiber 23f is soft, and when the blade 25a and the fiber 23f come into contact, the fiber 23f bends significantly and the blade 25a bends less, so the amplitude of the induced horizontal vibration of the blade 25a is relatively small. The amplitude of the horizontal vibration of the blade 25a depends on the softness and hardness of the fiber 23f (the rigidity of each fiber), the internal structure of the material of the sample 23 (bulk, fiber bond strength), micro and macro compressibility, additive chemicals (softener, starch, dry strength agent), etc. The resonant frequency is constant depending on the material and geometric dimensions of the sample 23, and is approximately 6,500 Hz.

[0056] FIG. 6 shows an example of a frequency spectrum obtained as a result of acoustic measurement by the measurement device TSA 20. The horizontal axis is frequency (unit: Hz) and the vertical axis is amplitude (intensity) (unit: dBV 2 The resulting spectrum generally consists of two overlapping single spectra.

[0057] The single spectrum based on the vertical vibration of sample 23, as described with reference to Figure 4, appears as the first maximum peak P1 in the spectrum viewed from the low frequency side. The intensity (amplitude) of maximum peak P1 is the TS750 value, which is an index of the "smoothness / roughness" of sample 23. The smaller the TS750 value, the smoother the sample 23 is evaluated to be.

[0058] 5, the single spectrum based on the horizontal vibration of the blade 25a appears as a maximum peak P2 in the spectrum including (around) 6500 Hz, which is the resonant frequency. The intensity (amplitude) of the maximum peak P2 is the TS7 value, which is an index of the "softness" of the sample 23. The smaller the TS7 value, the softer the sample 23 is evaluated to be.

[0059] In addition, in the measuring device TSA 20, as a second measurement step, a D value representing the "rigidity" of the sample 23 can be obtained by measuring the deformation by repeating a cycle of changing the load applied to the sample 23. A hand feel (HF) value can be obtained by a nonlinear algorithm from the obtained D value, the above-mentioned TS7 value and TS750 value, the paper thickness, basis weight, number of plies, etc. These D value and HF value are not numerical values ​​defined in the embodiment of the present invention, so further explanation of them will be omitted in this specification.

[0060] (TS7 value measurement procedure) Measurement of the TS7 value using the tissue softness measuring device TSA 20 can be performed according to the following procedure.

[0061] (1) Sample preparation The toilet paper 13 is unwound from the toilet roll 10, and a circular toilet paper sample 23 having a diameter of 112.8 mm is cut out. The sample 23 includes a set of two sheets 11, 12 that make up the toilet paper 13. An Emtec sample punch may be used to cut out the sample 23.

[0062] (2) Mounting the sample The sample 23 is placed on the circular sample stage 21 so that the measurement surface of the sample 23 faces upward (i.e., the bladed rotor 25 side). Next, the sample fixing ring 24 is pressed down so as to hold the outer periphery of the sample 23, and the sample 23 is locked onto the sample stage 21.

[0063] (3) Measurement The bladed rotor 25 is pressed onto the sample 23 with a pressing pressure of 100 mN. Next, the motor 25b is operated to rotate the bladed rotor 25 at a rotation speed of 2.0 revolutions per second. The vibration of the sample stage 21 at this time is measured by the vibration sensor 21a installed inside the sample stage. Using software, the vibration frequency is analyzed and the TS7 value is automatically obtained.

[0064] (4) Calculation of the average For 10 types of toilet rolls, the above steps (1) to (3) are repeated to perform a total of 10 measurements, and the TS7 value is obtained as the average value.

[0065] (TS7 value) Here, the TS7 value of the toilet roll 10 according to the embodiment of the present invention is defined as follows.

[0066] (TS7 external surface) Using the tissue softness measuring device TSA 20, the toilet paper 13 is placed on the sample stage 21 with the outer side of the toilet roll 10 facing up. The bladed rotor 25 is pressed from above with a pressing pressure of 100 mN, and then rotated at a rotation speed of 2.0 per second. The vibration of the sample stage 21 is measured by the vibration sensor 21a. The TS7 outer surface, which is the intensity of the maximum peak (TS7 value) of the spectrum including the frequency of 6500 Hz, is 13 dBV. 2 rms over 20dBV 2 is less than rms.

[0067] (TS7 inside) Using the tissue softness measuring device TSA, toilet paper 13 is placed on sample stage 21 with the inner side of the toilet roll 10 facing up, and a bladed rotor 25 is pressed from above with a pressing pressure of 100 mN, then rotated at a rotation speed of 2.0 per second. The vibration of sample stage 21 is measured by vibration sensor 21a, and the intensity of the maximum peak (TS7 value) of the spectrum including a frequency of 6500 Hz is obtained; the TS7 inner surface is greater than the TS7 outer surface.

[0068] TS7 external 13dBV 2 rms over 20dBV 2 When the TS7 outer surface is 13 dBV or less, the surface of the toilet paper 13 on the outside of the toilet roll 10 (hereinafter also referred to as the outer surface of the toilet paper) is soft and has an excellent texture. 2 If it is less than rms, when tail seal glue adheres to the outer surface of the toilet paper 13, the penetration of the glue in the thickness direction of the toilet paper 13 is promoted due to the texture structure in which the constituent fibers 23f etc. are raised on the surface. Therefore, when the end 15 of the toilet paper 13 is adhered to the outer periphery of the roll, the amount of glue (adhesive) that contributes to adhesion between the end 15 of the toilet paper 13 and the outer periphery of the roll (interface) is reduced, and the adhesiveness of the end 15 of the toilet paper 13 is reduced. 2 Above rms, the softness of the outer surface of the toilet paper 13 decreases as the value increases.

[0069] If the TS7 inner surface is larger than the TS7 outer surface (i.e., the difference between the TS7 inner surface and the TS7 outer surface D (TS7 inner surface - TS7 outer surface) > 0 dBV 2rms), the surface of the toilet paper 13 on the inside of the toilet roll 10 (hereinafter also referred to as the inner surface of the toilet paper) has a texture that is equal to or moderately softer than the outer surface of the toilet paper, while the penetration speed of the glue into the inside of the toilet paper when tail seal glue or pick-up glue is attached is moderately suppressed. Therefore, when adhering the end 15 of the toilet paper 13 to the outer periphery of the roll, and especially when adhering the start end of the toilet paper 13 to the paper tube 14, the amount of glue (adhesive) that contributes to adhesion is secured, and good adhesion can be obtained.

[0070] The TS7 inner surface is preferably 30 dBV 2 rms over 40dBV 2 rms. TS7 internal is 30dBV 2 If the TS7 inner surface is less than 40 dBV, the inner surface of the toilet paper 13 becomes soft and the texture improves, but the effect of improving the adhesiveness at the beginning and end portions 15 is small. 2 If the TS inner surface is greater than 30 dBV, the surface of the toilet paper 13 will become less soft and the texture will become poor. 2 rms over 40dBV 2 When it is below rms, the inner surface of the toilet paper 13 is appropriately soft and has a good texture, and the adhesiveness at the beginning and end portions 15 is also good.

[0071] (Examples of manufacturing methods and manufacturing equipment applicable to embodiments of the present invention) Examples of methods and equipment applicable to manufacturing a toilet roll according to an embodiment of the present invention will be described with reference to Figures 1, 7 and 8. The toilet roll 10 can be manufactured, for example, as follows.

[0072] (Manufacture of raw rolls) Raw rolls 11R, 12R are manufactured to manufacture the sheets 11, 12, which are the components of the toilet paper 13. In detail, a papermaking machine (not shown) is used to make and wind wide (several times to twenty-odd times the width of the toilet roll) and long sheets 11L, 12L from a papermaking slurry (paper material), to manufacture the raw rolls 11R, 12R on which the sheets 11L, 12L are wound. As the papermaking machine, for example, a known papermaking machine such as a twin wire former, a cylinder former, a suction pressed former, or a crescent former can be used.

[0073] The papermaking machine may be equipped with a creping section that performs creping. In the creping section, during the drying of the sheet (web) to be made in the raw roll manufacturing process, a creping doctor can give the sheet very fine wavy wrinkles called crepes as necessary. Creping can give the sheet softness, bulkiness (bulk feeling), absorbency, aesthetic appearance (crepe shape), and good touch.

[0074] The papermaking machine may also include a calendar section. In the calendar section, the dried sheet may be subjected to a calendaring process, in which the sheet is sandwiched and pressed from above and below by a pair of calendar rolls, as necessary. This compresses the sheets 11L and 12L, adjusting and equalizing the paper thickness, and smoothing the surface. The calendaring process suppresses protrusions (fuzzing) caused by fibers on the sheet surface, and generally reduces softness. The calendaring section may be provided separately from the papermaking machine, and the calendaring process may be performed in any manufacturing process after the raw roll manufacturing process. The calendaring process may be performed in multiple stages.

[0075] (Toilet roll manufacturing) A toilet roll is manufactured using the raw rolls 11R and 12R. Fig. 7 is a schematic diagram showing an example of a manufacturing facility applicable to the manufacture of a toilet roll according to an embodiment of the present invention. Fig. 7 is for illustrative purposes and is not intended to limit the present invention.

[0076] The raw web roll 11R and the raw web roll 12R are rotatably attached to a raw web roll stand 70, and are rotated and driven by a raw paper sheet payout device (not shown) to pay out the sheets 11L and 12L. The sheets 11L and 12L may be of the same or different paper quality.

[0077] The sheets 11L and 12L unwound from the original rolls 11R and 12R are transported to an embossing section 76 disposed downstream of the original roll stand 70. Downstream of the embossing section 76, a winding section 77 and an end processing section 78 are further disposed in this order.

[0078] The embossing section 76 is, in short, a unit that embosses the sheets 11L and 12L to form embossed sheets.

[0079] The embossing section 76 includes two pairs of embossing roll units 71 and 72 and one bonding embossing roll unit 75 .

[0080] Each of the embossing roll units 71 and 72 has an embossing roll and a backup roll. The embossing roll of the embossing roll unit 71 is rotatable, and the outer peripheral surface of the embossing roll is formed with uneven portions corresponding to the embossing pattern of the first embossed portion 11a of the sheet 11 shown in Fig. 1. Similarly, the embossing roll of the embossing roll unit 72 is rotatable, and the outer peripheral surface of the embossing roll of the embossing roll unit 72 is formed with uneven portions corresponding to the embossing pattern of the second embossed portion (not shown) of the sheet 12 shown in Fig. 1.

[0081] On the upstream side of the embossing roll units 71, 72, two rotatable guide rollers 73, 74 for guiding the sheets 11L, 12L corresponding to the embossing roll units 71, 72, respectively, are provided.

[0082] In the manufacturing apparatus shown in FIG. 7, the embossing section 76 is configured to be able to selectively perform (i) single embossing, (ii) double embossing, or (iii) no embossing, depending on the paper path of the sheets 11L, 12L and the presence or absence of pressing by the embossing roll units 71, 72.

[0083] (i) Single embossing FIG. 7 shows an example of the paper path of the sheets 11L, 12L when single embossing is performed. When single embossing is performed, the sheets 11L, 12L fed from the original rolls 11R, 12R are both wrapped around a guide roller 73, overlapped, and guided toward the embossing roll unit 71. The embossing roll unit 71 includes an embossing roll and a backup roll arranged to be movable along the direction facing the embossing roll, and the overlapped sheets 11L, 12L are inserted between them. As a result of the backup roll being pressed against the outer circumferential surface of the embossing roll with a predetermined pressure, the sheets 11L, 12L passing between them are commonly embossed. In this case, sheets of the same or different paper quality can be used as the sheets 11L, 12L.

[0084] (ii) Double embossing When performing double embossing, the sheet 11L unwound from the original roll 11R is wound around a guide roller 73 and guided toward the embossing roll unit 71, and is inserted between the embossing roll and the backup roll of the embossing roll unit 71. Similarly, the sheet 12L unwound from the original roll 12R is wound around a guide roller 74 and guided toward the embossing roll unit 72. The embossing roll unit 72 includes an embossing roll and a backup roll arranged to be movable along the direction facing the embossing roll, and the sheet 12L is inserted between them. Each backup roll is pressed against the outer circumferential surface of the corresponding embossing roll with a predetermined pressure, and the sheets 11L and 12L passing between them are embossed. In this case, sheets of the same or different paper quality can be used as the sheets.

[0085] (iii) No embossing In the case of so-called no embossing, in which the sheets 11L and 12L are not embossed over the entire surface (whole surface), the sheets 11L and 12L are passed through the same paper passing path as either the double embossing or single embossing, but the backup roll is not pressed against the outer circumferential surface of the embossing roll in the embossing roll unit. In this case, sheets of different paper quality are used as the sheets 11L and 12L.

[0086] A bonding embossing roll unit 75 is disposed downstream of the embossing roll units 71 and 72. The bonding embossing roll unit 75 has an embossing wheel and a backing roll that face each other. The backing roll is rotatable so as to rotate synchronously with the embossing rolls of the embossing roll units 71 and 72, and an embossing pattern corresponding to the bonding embossing portion is formed on the outer circumferential surfaces of the embossing wheel and the backing roll.

[0087] The sheets 11L and 12L that have passed through the embossing roll unit are passed between the embossing wheel and the backing roll of the bonding embossing roll unit 75 in a mutually overlapping state, and are wound around the backing roll. At this time, as necessary, the embossing wheel is pressed against the rotating backing roll with a predetermined pressure by a fluid pressure cylinder, whereby the laminate of the sheets 11L and 12L is embossed for bonding, and a bonding embossed portion for preventing peeling is provided.

[0088] The bonding embossed portion is optional and not essential in the embodiment of the present invention. However, when the toilet roll is a non-embossed product and the sheets of the two-ply toilet paper are prone to peeling, the bonding embossed portion is preferably provided.

[0089] In this example, at least the uneven portions of the embossing rolls of the embossing roll units 71 and 72 and the joining embossing roll unit 75 are formed of metal, while the surface portion of the backup roll is formed of a hard rubber-like elastic material such as elastically deformable hard synthetic rubber.

[0090] By performing the embossing process using a male (convex) embossing steel roll and a plain rubber roll, it is possible to make the texture of one surface of the embossed sheet significantly different from that of the other surface. For example, in the embossed convex portion formed by the embossing steel roll, the nap of the sheet surface based on the constituent fibers of the sheet is crushed by contact with the plain rubber roll, reducing softness and increasing smoothness.

[0091] The wide toilet paper 13L formed by the sheets 11L and 12L laminated in the embossing section 76 is sent to a winding section 77 disposed downstream thereof.

[0092] In the winding section 77, the tip of the toilet paper 13L delivered from the embossing section 76 is wound around a wide (i.e., axially long) paper tube 14L, which serves as a roll core, via adhesive (pickup glue).

[0093] The toilet paper 13L is wound up to a predetermined length around the paper tube 14L to form a roll 86 that will become a wide toilet roll 10L (i.e., a large dimension in the CD direction), and the end of the toilet paper 13L is cut off by a cutting means (not shown). The resulting roll 86 is sent to the end processing section 78.

[0094] The end processing section 78 glues the end of the end of the roll 86 sent out from the winding section 77 to the surface (outer peripheral surface) of the roll 86 with an adhesive (tail seal glue) to form a wide toilet roll 10L, preventing the wide toilet roll 10L from unraveling.

[0095] In addition, prior to cutting the toilet paper 13L at the winding section 77 at predetermined lengths, tearing perforations that cross the width direction of the toilet paper 13L may be formed at regular intervals along the longitudinal direction (MD direction) of the toilet paper 13L. Any known perforation forming means can be used to form the tearing perforations. However, the formation of such tearing perforations is optional and not essential in the embodiment of the present invention.

[0096] The wide toilet roll 10L is then conveyed from the end processing section 78 to a cutting section (not shown) where it is cut to a predetermined width according to the product specifications, etc., into individual toilet rolls 10.

[0097] Meanwhile, in the winding section 77, the tip end of the toilet paper 13L (i.e., the end of the toilet paper 13L on the original roll 11R, 12R side) produced by cutting the toilet paper 13L every predetermined length is wound, via adhesive, around a new long winding core in the axial direction arranged in the winding section 77, so that the toilet paper 13L is again wound around the long winding core in the axial direction by a predetermined length.

[0098] Fig. 8 is a diagram showing a configuration example of a gluing equipment 80 applicable to the winding section 77 and the end processing section 78. With reference to Fig. 8, the process of gluing one end (starting end) of the toilet paper 13L to the paper tube 14L with pick-up glue and the process of gluing the other end (ending end) to the outer periphery of the roll with tail seal glue will be described in more detail. In Fig. 8, R1 to R5 indicate rolls.

[0099] First, as shown in part A of FIG. 8, a cylindrical or columnar (rod) shaped mandrel shaft 81 is inserted into a wide cardboard tube 14L, and the wide cardboard tube 14L is fixed to the mandrel shaft 81. Next, as shown in part B of FIG. 8, a coater 82 is used to coat the wide cardboard tube 14L with a pickup glue 83, forming a pickup glue coated portion 84. Note that instead of coating with the coater 82, the pickup glue may be applied using any known method, such as spraying with a spray. Coating with the coater 82 is preferable from the viewpoint of being able to reliably apply glue to the desired portion.

[0100] The pickup glue coating portion 84 only needs to be formed along the width direction of the wide paper tube 14L (i.e., parallel to the longitudinal direction), and does not necessarily need to be formed continuously over the entire width direction (longitudinal direction).

[0101] Next, as shown in part C of Fig. 8, the mandrel shaft 81 to which the wide paper tube 14L is fixed is moved toward the delivery roller 85, and the pickup glue coating section 84 formed on the wide paper tube 14L is pressed against the toilet paper 13L delivered from the embossing section 76 via the delivery roller 85. This operation allows the wide paper tube 14L and the toilet paper 13L to be bonded and fixed.

[0102] Next, as shown in part D of Figure 8, the mandrel shaft 81 is rotated in the circumferential direction of the wide paper tube 14L by meshing gears (not shown) or the like. This rotation causes the toilet paper 13L to be wound around the wide paper tube 14L, forming a roll 86. After a predetermined length of the toilet paper 13L is wound around the wide paper tube 14L, it is cut. This cutting forms the end of the winding of the toilet paper 13L.

[0103] Next, as shown in part E of Fig. 8, a tail seal glue is applied to the end of the toilet paper 13L using a coater 87 to form a tail seal glue-coated part 88. Instead of coating with the coater 87, the tail seal glue may be applied using any known method, such as spraying with a spray. Coating with the coater 87 is preferred from the viewpoint of being able to reliably apply glue to the desired part.

[0104] The tail seal glue-coated portion 88 only needs to be formed along the width direction of the toilet paper 13L so as to be parallel to the end of the toilet paper 13L, and does not necessarily have to be formed continuously at the end. The tail seal glue-coated portion 88 is preferably formed at a position 10 to 50 mm away from the end of the toilet paper 13L, or at a position on the outer circumferential surface of the roll where the above-mentioned position of the long base paper abuts.

[0105] Depending on the settings of the coater 87, the tail seal glue coating portion 88 can be formed on the end portion of the toilet paper 13L (the inner surface of the toilet paper 13) or on the outer peripheral surface of the roll (specifically, the portion of the outer surface of the toilet paper 13 that will come into contact with the end portion of the toilet paper 13L).

[0106] However, in an embodiment of the present invention, the tail seal glue application portion 88 is formed on the inner surface of the toilet paper 13, which is the surface of the toilet paper 13L with a relatively high TS7 value. This is because if the tail seal glue is applied to the surface with a low TS7 value, the penetration of the glue in the thickness direction of the toilet paper 13 is promoted due to the texture of the surface (raised nap, etc.), reducing the amount of glue contributing to adhesion and decreasing adhesiveness.

[0107] Next, as shown in part F of Fig. 8, the tail seal glue-coated portion 88 formed at the end of the toilet paper 13L is pressed against the outer circumferential surface of the roll 86. This operation bonds and fixes the end of the toilet paper 13L to the outer circumferential surface of the roll 86, forming a log of the wide toilet roll 10L.

[0108] The formed log of wide toilet roll 10L is then subjected to a cutting process by a cutting means (not shown) and cut to a predetermined width (product width of the toilet roll) to manufacture the toilet roll 10.

[0109] (Action and effect) According to this embodiment, the two sheets 11 and 12 constituting the two-ply toilet paper 13 each have a basis weight of 11 g / m 2 More than 16g / m 2 or less, which ensures appropriate strength and water absorption, and the toilet roll 10 has a winding length of 33 m to 100 m and a winding diameter of 100 mm to 134 mm, and the length of toilet paper 13 per roll is long, thereby making it possible to obtain a toilet roll 10 that saves space when transporting and storing.

[0110] In addition, the TS7 value obtained by the tissue softness measuring device TSA 20 for the two-ply toilet paper 13 is 13 dBV for the TS7 outer surface. 2 rms over 20dBV 2 rms, and the TS7 inner surface is greater than the TS7 outer surface (difference D(TS7 inner surface - TS7 outer surface)>0 dBV 2 rms), the outer surface of the toilet paper 13 (the surface that faces the outside of the roll) is excellent in softness and texture, and the inner surface of the toilet paper 13 (the surface that faces the inside of the roll) has good softness.

[0111] In addition, due to the difference in the tissue structure between the outer and inner sides of the toilet paper 13, which is reflected in the difference in the values ​​of TS7 outer and inner sides, the permeability of adhesives (pickup glue and tail seal glue) that penetrate into the inner side of the toilet paper 13 is suppressed at the beginning and end of the toilet paper 13.

[0112] Therefore, according to this embodiment, the 2-ply toilet roll 10 can save space when transporting and storing, while also improving the texture of the toilet paper 13 and improving the adhesion of the starting end of the toilet paper 13 to the paper tube 14 and / or the adhesion of the terminal end of the toilet paper 13 to the outer periphery of the roll.

[0113] The configuration and effects of the toilet roll 10 according to the first embodiment of the present invention have been described above with reference to Fig. 1. In the first embodiment, an example was shown in which double embossing was used as one of the means for making the TS7 values ​​on both sides of the toilet paper 13 (i.e., the TS7 outer surface and the TS7 inner surface) different.

[0114] In an example using double embossing, the TS7 values ​​(TS7 outer surface and TS7 inner surface) of both sides of the toilet paper 13 can be controlled by varying the conditions of the embossing applied to each of the two sheets 11 and 12 that make up the toilet paper 13. For example, the embossing pattern, the size of the embossed protrusions (diameter, etc., mm), the density of the embossed protrusions (pieces / cm 2 ), height of embossed convex part (mm), embossing pressure (gf / cm 2 ) By appropriately setting the paper thickness and density after application of the embossing pressure, etc., the TS7 value of both sides can be controlled by making the surface textures of the sheets 11, 12 that the user touches during use different.

[0115] It should be noted that double embossing is not a required component of the toilet roll 10 according to the embodiment of the present invention. In the embodiment of the present invention, the means for controlling the TS7 value is not limited as long as the TS7 values ​​of both sides of the toilet paper 13 (the TS7 outer surface and the TS7 inner surface) can be set within the above-mentioned predetermined TS7 value range according to the present invention.

[0116] Second embodiment Next, a second embodiment of the present invention will be described. Unless otherwise specified, the configuration applicable to the first embodiment is also applicable to this embodiment.

[0117] The toilet roll according to the second embodiment of the present invention is characterized in that the toilet paper is formed using two sheets of different paper qualities.

[0118] Referring to FIG. 1, in the toilet roll 10 according to the embodiment of the present invention, the TS7 value of the toilet paper 13 is 13 dBV on the TS7 outer surface. 2 rms over 20dBV 2rms or less, and the TS7 inner surface is greater than the TS7 outer surface. In the second embodiment, toilet paper 13 is formed using two sheets 11, 12 of different paper qualities, thereby making the texture of the surface of sheet 11 (the outer surface of toilet paper 13) on the outside of the roll different from the texture of the surface of sheet 12 (the inner surface of toilet paper 13) on the inside of the roll, thereby obtaining the desired TS7 value and its difference between the front and back.

[0119] "Paper quality" refers to the quality and properties of paper, and the paper quality of the sheets 11 and 12 refers to the quality and properties of the sheets 11 and 12 as paper. The sheets 11 and 12 are obtained by making a slurry containing a pulp component, which is a fiber raw material. More specifically, the sheets 11 and 12 are made by dispersing the pulp component, which is an aggregate of cellulose fibers extracted from plants such as wood, in water to make a papermaking slurry (paper material), which is then poured onto a screen or a sieve to form a uniform thin layer, and the fibers are entangled, dehydrated, and dried. During this process, various treatments and processes such as the addition and application of chemicals and the pressing of the sheets 11 and 12 are performed to complete the sheets 11 and 12. The various treatments and processes include, for example, creping, calendaring, and embossing.

[0120] In this embodiment, the two sheets 11, 12 having different paper qualities can be obtained by, for example, differentiating at least one of the types and amounts of raw materials such as pulp components and additive chemicals, and various treatments and processing of the sheets 11, 12.

[0121] 5, the TS7 value (TS7 outer surface and TS7 inner surface) indicating softness is affected by the nap originating from the constituent fibers protruding from the surface of the toilet paper 13. Therefore, in this embodiment, it is particularly preferable to use two sheets 11, 12 of different paper qualities from the viewpoint of properties that may affect the TS7 value, such as the state of the nap originating from the constituent fibers protruding from the sheet surface.

[0122] As a non-limiting example, the two sheets 11, 12 of different paper qualities can be obtained, for example, by one of the following methods or a possible combination thereof:

[0123] (1) A method of varying the degree of beating of pulp in the sheet. That is, the two sheets 11, 12 are made from pulp having different degrees of beating.

[0124] Pulp is an aggregate of cellulose fibers. By beating the pulp, the surface of each cellulose fiber is fibrillated and fuzzed, increasing the area for hydrogen bonding and promoting bonding between the individual cellulose fibers. When the cellulose fibers are bonded together, the number of individual cellulose fibers that can move freely decreases, and the surface of the paper-formed sheets 11, 12 becomes less napped. As the degree of beating increases, bonding between the fibers progresses, the gaps between the fibers decrease, and the density of the sheets 11, 12 increases.

[0125] In contrast, when the degree of beating is low, the pulp is not cut or crushed to a great extent, and the surface of each cellulose fiber is less fuzzed (fibrillated). Therefore, each cellulose fiber is less likely to form hydrogen bonds with each other, and the surface of the paper-made sheets 11 and 12 is more napped due to free cellulose fibers.

[0126] As described above, by varying the degree of beating of the pulp, the amount of raised nap on the paper-made sheets 11, 12 can be adjusted. The degree of beating (beating degree) can be expressed, for example, by freeness (JIS P8121). As beating progresses, the pulp becomes less water-repellent and the freeness decreases. When paper is made using the same type of pulp with different beating degrees, the greater the reduction in freeness (freeness down range) from the freeness of unbeaten pulp, the less raised nap there is on the surface of the paper-made sheets 11, 12.

[0127] Therefore, by producing the sheets 11 and 12 using pulp with different beating degrees, it is possible to obtain the sheets 11 and 12 with different paper qualities (surface raised state). This allows the TS7 value to be adjusted so that the TS7 outer surface and the TS7 inner surface are different.

[0128] (2) A method of adding different chemicals (softeners) to the papermaking slurry (paper material). In order to improve the softness and feel of the sheets 11 and 12, a softener is generally added to the slurry for making the sheets.

[0129] Pulp is an aggregate of cellulose fibers, and the cellulose fibers are anionic. When, for example, a cationic surfactant is used as a softener, the cationic surfactant and the anionic cellulose fibers are bonded, and the individual cellulose fibers are less likely to form hydrogen bonds with each other, and the surfaces of the sheets 11 and 12 produced by papermaking become more napped due to the free cellulose fibers.

[0130] Therefore, by manufacturing the sheets 11 and 12 using papermaking slurries with different amounts of cationic surfactant, it is possible to obtain the sheets 11 and 12 with different paper qualities (surface raised state). The more the amount of cationic surfactant added, the greater the amount of raised surface. This allows the TS7 value to be adjusted so that the TS7 outer surface and the TS7 inner surface are different.

[0131] (3) A method of varying the pulp content ratio in the sheet. One method is to use paper materials with different blend ratios of pulp components to produce two sheets 11 and 12. For example, when hardwood pulp (L wood) and / or softwood pulp (N wood) are used as the pulp components of the sheets, the blend ratio (L / N ratio) is made different between sheets 11 and 12.

[0132] Generally, hardwood pulp is flexible, so sheets containing hardwood pulp are soft, smooth, and pleasant to the touch. On the other hand, softwood pulp has long, strong fibers and can impart strength to the sheet produced. By utilizing the difference in properties at the cellular level between hardwood pulp and softwood pulp and varying the blending ratio of the pulp components (L / N ratio), two sheets 11 and 12 with different paper qualities can be obtained.

[0133] The above is just one example, and the number and types of pulp components used in combination are not limited to the above example.

[0134] The above-mentioned methods are illustrative and not limiting. These methods can be used alone or in combination. These methods may also be used in combination with other methods other than those mentioned above. For example, generally, the greater the basis weight of the sheet, the greater the number of naps, so a method of varying the basis weight, alone or in combination with the above-mentioned methods, may be used to obtain two sheets 11, 12 with different paper qualities.

[0135] In this way, by forming toilet paper 13 using sheets 11 and 12 with different paper qualities, it is possible to make the surface texture of sheet 11, which is the outside of the roll, different from the surface texture of sheet 12, which is the inside of the roll. Also, by appropriately selecting the paper qualities of sheets 11 and 12, it is possible to improve the feel of both sides of toilet paper 13, i.e., the feel of the surface of sheet 11, which is the outside of the roll, and the feel of the surface of sheet 12, which is the inside of the roll.

[0136] (Action and effect) In the second embodiment, two sheets 11 and 12 of different paper qualities are used to form a two-ply toilet paper 13, which is used as a means for achieving the TS7 value (TS7 outer surface and TS7 inner surface) according to the embodiment of the present invention. This embodiment can be realized by making the degree of beating of the pulp, the type and amount of softener added, and the blending ratio (L / N ratio) of the pulp components different for each of the two sheets 11 and 12. Therefore, it is not necessary to perform further processing to provide a difference in the TS7 value between the front and back of the laminate of the two sheets 11 and 12 after they are stacked. Therefore, the present invention can also be applied to a toilet roll that is a so-called non-embossed product in which the entire surface (whole surface) of the toilet paper 13 is not embossed.

[0137] (Third embodiment) Next, a third embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above-mentioned embodiments are also applicable to this embodiment.

[0138] In the toilet roll according to the third embodiment, the toilet paper is characterized in that a single embossment is applied to the entire surface (whole surface) of the paper, and the toilet paper is wound up so that the embossed recesses are on the outside of the roll.

[0139] The toilet roll 10 according to the third embodiment is one in which the entire toilet paper 13 (i.e., the laminated sheet consisting of sheets 11 and 12) is subjected to a collective embossing process as a means for making the texture (particularly the TS7 value) different on both sides of the toilet paper 13.

[0140] For example, the toilet paper 13 may have a repeating pattern of multiple embossed portions 11a that protrude toward the inside of the toilet roll 10 across the entire surface of the paper, as shown in Fig. 1. By making the embossed portions 11a of the toilet paper 13 protrude toward the inside of the roll, the feel of the surface of the sheet 11 on the outside of the roll in the toilet paper 13 can be improved, and the texture (TS7 value) of the surface of the sheet 11 on the outside of the roll can be made different from the surface of the sheet 12 on the inside of the roll. Note that the pattern of the embossed portions 11a shown in Fig. 1 is merely an example and does not limit the present invention.

[0141] In this embodiment, non-limiting examples of the means for controlling the TS7 value include the embossing pattern formed by embossing, the size of the embossed protrusions (diameter, mm), the density of the embossed protrusions (pieces / cm 2 ), the height (mm) of the embossed convex portion, etc. Also, the TS7 value can be varied and controlled by selecting the type of embossing roll used in the embossing process (for example, whether the embossing process is performed using a male (convex) embossing roll and a female (concave) embossing roll, and in that case, whether the engagement is matched or not, or whether the embossing process is performed using a male (convex) embossing steel roll and a plain rubber roll, or other roll combinations), the hardness of the embossing roll, changing the embossing pressure, etc.

[0142] (Action and effect) In the third embodiment, single embossing is used to create a difference in texture (TS7 value) between the front and back of the toilet paper 13. According to this embodiment, with a simple configuration, it is possible to improve both the texture of the toilet paper 13 and the adhesiveness of the beginning and end of the toilet paper 13.

[0143] As a means for creating a difference in texture (TS7 value) between the front and back of the toilet paper 13, in the first embodiment double embossing is performed, in the second embodiment two sheets 11, 12 of different paper qualities are used, and in the third embodiment single embossing is performed; however, this is not limited to the above, and in addition to using two sheets 11, 12 of different paper qualities, double embossing or single embossing may also be performed.

[0144] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above-mentioned embodiments are also applicable to this embodiment.

[0145] The toilet roll according to the fourth embodiment is characterized in that the ratio R of the TS7 inner surface to the TS7 outer surface (TS7 inner surface / TS7 outer surface) is 1.01 or more and 2.20 or less.

[0146] In the toilet roll 10 according to the embodiment of the present invention described above, the TS7 value is 13 dBV on the TS7 outer surface. 2 rms over 20dBV 2 rms or less, and the TS7 inner surface is larger than the TS7 outer surface. In the fourth embodiment, the ratio R of the TS7 inner surface to the TS7 outer surface (TS7 inner surface / TS7 outer surface) is set to 1.01 or more and 2.20 or less.

[0147] The essence of the present invention is to achieve both the texture of the toilet paper 13 and its adhesiveness to the paper tube 14 and the outer periphery of the roll by providing a difference in texture (TS7 value) between the front and back of the toilet paper 13, thereby improving the adhesiveness of the inner surface of the toilet paper 13 to the paper tube 14 and the outer periphery of the roll while ensuring the softness of the outer surface of the toilet paper 13.

[0148] The way toilet paper 13 is used varies depending on the user and the time and situation, so the surface of toilet paper 13 that is used (the surface that the user mainly touches when using it) is not limited to the outer surface. Therefore, from the perspective of texture, it is preferable that the difference between the outer surface and the inner surface is small. The difference between the outer surface and the inner surface can be expressed by the ratio R (TS7 inner surface / TS7 outer surface). The closer the value of the ratio R is to 1, the smaller the difference between the outer surface and the inner surface.

[0149] On the other hand, if you try to reduce the value of the ratio R (TS7 inner surface / TS7 outer surface) to reduce the difference between the front and back, the adhesiveness tends to decrease if you prioritize texture, and the texture tends to decrease if you prioritize adhesiveness. Therefore, from the perspective of the balance between texture and adhesiveness, it is desirable for the ratio R (TS7 inner surface / TS7 outer surface) to be somewhat large.

[0150] Therefore, in this embodiment, the ratio R (TS7 inner surface / TS7 outer surface) is preferably 2.20 or less from the viewpoint of reducing the difference in texture between the front and back, and is preferably 1.01 or more from the viewpoint of balancing texture and adhesiveness.

[0151] In manufacturing a toilet roll according to an embodiment of the present invention, in order to form toilet paper, (1) An embodiment including a no-embossing step in which two sheets of different paper quality are used and the two sheets are overlapped without embossing the entire surface of each of the two sheets; (2) An embodiment including a double embossing process in which two sheets of the same or different paper quality are used, and the two sheets are embossed under different embossing conditions on the entire surface thereof before the two sheets are superimposed; (3) An embodiment including a single embossing step in which two sheets of the same or different paper quality are used, and the two sheets are superimposed and embossed all over the two sheets at once. I have explained that there is.

[0152] As a method for adjusting the values ​​of the TS7 inner surface and the TS7 outer surface to a desired relationship, In regard to embodiment (1), in short, by selecting sheets of different paper quality for the two sheets, for example by varying the softness and hardness (stiffness of each fiber) of the fibers used in sheets 11 and 12, the chemicals added during sheet making (softener, starch, dry strength agent), the internal structure of the material of the sheet (bulk, fiber bonding strength), micro- and macro-compressibility, etc., it is possible to control the TS7 values ​​(TS7 outer surface and TS7 inner surface) of both sides of toilet paper 13. Specifically, the TS7 value for each sheet is adjusted by varying the degree of beating of the pulp, the amount of chemicals added (softener), the basis weight of the sheet, the paper thickness, the creping conditions, the calendering conditions, etc.

[0153] In the embodiment (2), the TS value of each sheet can be adjusted by varying the conditions of the embossing process performed on each of the two sheets 11 and 12 that make up the toilet paper 13. For example, the embossing pattern formed by the embossing process, the size of the embossed protrusions (diameter, mm), the density of the embossed protrusions (pieces / cm 2 ), height of embossed convex part (mm), embossing pressure (gf / cm 2 ) By appropriately setting the paper thickness and density after the embossing pressure is applied, the TS7 value of both sides of the toilet paper 13 can be controlled by varying the surface texture of each sheet.

[0154] Regarding the embodiment (3), for example, the embossed pattern formed by embossing, the size of the embossed convex parts (diameter, mm), the density of the embossed convex parts (pieces / cm 2), the height (mm) of the embossed convex portion, etc. Also, the relationship between the TS7 values ​​on both sides of the toilet paper 13 can be controlled to be different by selecting the type of embossing roll used in the embossing process (for example, whether a male (convex) embossing roll and a female (concave) embossing roll are used, and in that case, whether they are matched or not, or whether a male (convex) embossing steel roll and a plain rubber roll are used), changing the hardness of the embossing roll, the embossing pressure, etc.

[0155] In the case of an embodiment in which the toilet paper has a single embossed specification, the ratio R (TS7 inner surface / TS7 outer surface) is preferably in the range of 1.80 to 2.20. In the case of an embodiment in which the toilet paper has a double embossed specification, the ratio R (TS7 inner surface / TS7 outer surface) is preferably in the range of 1.01 to 1.85. When the ratio R (TS7 inner surface / TS7 outer surface) is in this range, the balance between texture and adhesiveness is excellent. EXAMPLES

[0156] Using the manufacturing apparatus shown in FIG. 7, toilet rolls were manufactured through the following manufacturing steps. (a) A slurry (stock) for papermaking with a pulp composition of 30% by mass of softwood bleached kraft pulp (NBKP):70% by mass of hardwood bleached kraft pulp (LBKP) was used to produce a number of sheets. At least one of the following was varied for some of the sheets: pulp beating degree, amount of added chemicals (softener), sheet basis weight, paper thickness, creping conditions, and calendaring conditions. (b) For Examples 1, 2, 4, 5, 8, 10 and Comparative Examples 1 and 2, the embossing specification was single embossing. That is, two of the multiple sheets produced were stacked to form one laminated sheet, and the entire surface of the laminated sheet was subjected to single embossing such that one side was embossed concavely and the other side was embossed convexly. The pressure and / or speed used for embossing was varied depending on the sample. (c) For Examples 3, 6, 7, 9, and 11, double embossing was performed. That is, the entire surface of each of two of the sheets produced was embossed with a concave embossing on one side and a convex embossing on the other side, and then the two sheets were stacked together so that the concave embossing was on the outer side to form a single laminated sheet. At this time, the pressure and / or speed used for embossing was varied depending on the sample. (d) The starting end of the laminated sheet was pressed against a paper tube coated with pick-up glue, glued and fixed, and then wound into a roll around the paper tube with the embossed recess facing outside the roll. (e) When the wound length reaches a predetermined length, the end of the wound laminated sheet is cut off and the end of the laminated sheet is adhesively fixed to the outer periphery of the roll with a tail seal glue to obtain a wide toilet roll. (f) The wide toilet roll was cut to a specified width to produce a toilet roll in which 2 plies of embossed toilet paper were wound into a roll.

[0157] The following measurements and evaluations were carried out for the toilet rolls of Examples 1 to 11 and Comparative Examples 1 and 2. The measurements were carried out by conditioning the samples in an environment conforming to Japanese Industrial Standard JIS P8111 (temperature 23±1°C, humidity 50±2% RH).

[0158] <Measurement> [Toilet roll length [m]] While unwinding the toilet paper from the manufactured toilet roll, the length of the toilet paper wound around the paper tube from the end to the beginning was measured. Measurements were taken in 0.5 m increments and decimals were rounded down.

[0159] [Toilet roll diameter [mm]] The outer diameter of the produced toilet roll was measured with a vernier caliper and rounded off to the nearest whole number.

[0160] [Core diameter of paper tube [mm]] The outer diameter of the paper tube of the manufactured toilet roll was measured with a vernier caliper and rounded off to the nearest whole number.

[0161] [Basis weight of base paper sheet (per base paper sheet) [g / m 2 ]〕 The basis weight of the base paper sheet used in the manufacture of the toilet roll was measured in accordance with Japanese Industrial Standard JIS P8124.

[0162] [Basis weight (per sheet) [g / m 2 ]〕 The toilet paper was pulled out from the toilet roll, and the basis weight of the two-ply toilet paper 13 was measured in accordance with Japanese Industrial Standard JIS P8124, and divided by 2, the number of plies, to obtain the basis weight per sheet. Specifically, the two-ply toilet paper 13 was conditioned according to the method specified in Japanese Industrial Standard JIS P8111, and the conditioned two-ply toilet paper 13 was cut into a size of 10 cm x 10 cm while the two sheets 11, 12 were still stacked, the weight of the cut-out two-ply toilet paper 13 was measured, and the weight was multiplied by 0.01 m of the cut-out area of ​​the two-ply toilet paper 13. 2 The basis weight of the 2-ply toilet paper 13 was measured by dividing the basis weight by 2, the number of plies, to obtain the basis weight per sheet.

[0163] [Paper thickness (per 2-ply toilet paper) [μm]] Toilet paper was pulled out from the toilet roll, and the thickness of the two-ply toilet paper (two sheets in one set) was determined in accordance with the International Organization for Standardization standard ISO 12625-3.

[0164] (TS7 exterior and TS7 interior) Using the above-mentioned tissue softness measuring device TSA, the above-mentioned TS7 value measurement procedure was followed to obtain the TS7 outer surface, with the outer surface of the toilet paper (the surface that faces the outside of the toilet roll) as the measurement surface, and the TS7 inner surface, with the outer surface of the toilet paper (the surface that faces the outside of the toilet roll) as the measurement surface.

[0165] [Difference D (TS7 inner surface - TS7 outer surface)] [dBV 2 [ms] The difference D between the TS7 inner surface and the TS7 outer surface (TS7 inner surface-TS7 outer surface) was calculated by subtracting the value of the TS7 outer surface from the value of the TS7 inner surface.

[0166] [Ratio R (TS7 inner surface / TS7 outer surface)] The ratio R of the TS7 inner surface to the TS7 outer surface (TS7 inner surface / TS7 outer surface) was calculated by dividing the value of the TS7 inner surface by the value of the TS7 outer surface.

[0167] <Evaluation> A sensory evaluation was performed for the following items, and the results were indicated by symbols (◎: excellent, ◯: good, △: acceptable, ×: unacceptable). The sensory evaluation was a relative evaluation of samples with the same toilet roll length.

[0168] [The texture of the outer surface of toilet paper] The softer the outer surface of the toilet paper felt, the better the texture was rated (◎).

[0169] [The texture of the inner surface of toilet paper] The softer the feel of the inside of the toilet paper, the better the texture (◎).

[0170] [Adhesion by pick-up glue] The toilet roll was crushed in the radial direction, then rotated 90 degrees and crushed again in the radial direction 10 times, and the ease with which the beginning of the toilet paper peeled off from the paper tube was evaluated. The harder it was to peel off, the better the adhesion (◎).

[0171] [Adhesion with tail seal glue] The toilet roll was crushed in the radial direction, then rotated 90 degrees and crushed again in the radial direction 10 times, and the ease with which the end of the toilet paper peeled off from the outer circumference of the roll was evaluated. The harder it was to peel off, the better the adhesion (◎).

[0172] The test results are shown in Tables 1 and 2.

[0173] [Table 1]

[0174] [Table 2]

[0175] As shown in Tables 1 and 2, in all of Examples 1 to 11 (all Examples) and Comparative Examples 1 and 2 (all Comparative Examples), the toilet roll had a roll length of 33 m or more and 100 m or less, and a roll diameter of 100 mm or more and 134 mm or less. The roll diameter was large enough to be freely rotatably stored in a typical toilet roll holder, and the roll length was long, allowing the roll to be transported and stored in a space-saving manner.

[0176] In addition, the basis weight per sheet constituting the two-ply toilet paper of Examples 1 to 11 is 11 g / m 2 More than 16g / m 2 This was a size that ensured adequate strength and water absorption.

[0177] In addition, in Examples 1 to 11, the TS7 outer surface is 13 dBV 2 rms over 20dBV2 The rms was less than or equal to TS7 and the TS7 inner surface was greater than the TS7 outer surface. The hand (softness) of the outer surface of the toilet paper was good to excellent and the adhesion was excellent for both the pick-up glue and the tail seal glue.

[0178] In contrast, Comparative Example 1 has a basis weight of 16.1 g / m 2 This is slightly above the upper limit of the basis weight range of the present invention. 2 rms, which was smaller than the lower limit of the range of the TS7 outer surface of the present invention, and the texture (softness) of the outer surface of the toilet paper was good, but the adhesion of the tail seal glue was poor and easily peeled off. This is presumably because, when the tail seal glue was applied to the outer surface of the toilet paper of Comparative Example 1, the penetration of the glue in the thickness direction of the toilet paper was promoted due to the structure in which the constituent fibers etc. were raised on the surface, and therefore, when the end of the toilet paper was adhered to the outer periphery of the roll, the amount of glue (adhesive) contributing to adhesion between the end of the toilet paper and the outer periphery of the roll (interface) was reduced, and the adhesiveness of the end of the toilet paper was reduced.

[0179] In addition, in Comparative Example 2, the TS7 outer surface is 21.8 dBV 2 rms, which was above the upper limit of the range for the TS7 outer surface of the present invention, and the feel (softness) of the outer surface of the toilet paper was poor. [Explanation of symbols]

[0180] 10 Toilet Roll 11,12 sheets 11R, 12R Original roll 13. Toilet Paper 14 Paper tube 15 End 20 Tissue Softness Measurement Device TSA 21 Sample stage 23 Sample 24 Sample fixing ring 25 blade rotor 25a blade 25b Motor 70 Raw material roll stand 71,72 Embossing roll unit 73,74 Guide roller 75 Embossing roll unit for bonding 76 Embossed section 77 Winding section 78 Terminal processing section 80 Gluing equipment 81 Mandrel shaft 82 Coater 83 Pickup Glue 84 Pickup Glue Coating Department 85 Delivery roller 86 rolls 87 Coater 88 Tail seal glue coating section DR Toilet roll diameter DC Paper Tube Diameter P1 Peak TS7 value P2 TS750 peak

Claims

[Claim 1] A toilet roll in which two sheets of toilet paper are overlapped to form a two-ply toilet paper roll wound around a paper tube, The toilet roll has a roll length of 33 m or more and 100 m or less, and a roll diameter of 100 mm or more and 134 mm or less, The basis weight of each sheet is 11 g / m 2 16g / m or more 2 is as follows: Using a tissue softness measuring device (TSA), a sample of the toilet paper is placed on a sample stage with the outer side of the toilet roll facing up, and a bladed rotor is pressed from above with a pressing pressure of 100 mN, then rotated at a rotation speed of 2.0 per second. The vibration of the sample stage is measured with a vibration sensor, and the TS7 outer surface, which is the intensity of the maximum peak (TS7 value) of the spectrum containing a frequency of 6500 Hz, is 13 dBV. 2 rms or more 20dBV 2 is less than or equal to the rms A toilet roll characterized in that, using the tissue softness measuring device TSA, a toilet paper sample is placed on the sample stage with the inner side of the toilet roll facing up, a bladed rotor is pressed from above with a pressing pressure of 100 mN, and then the sample stage is rotated at a rotation speed of 2.0 per second, and the vibration of the sample stage is measured with a vibration sensor, and the TS7 inner surface, which is the intensity of the maximum peak (TS7 value) of the spectrum including a frequency of 6,500 Hz, is greater than the TS7 outer surface.

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