JP7006754B1 - Toilet roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toilet roll having a long winding length and saving space such as storage, and having excellent both the texture of toilet paper and the adhesiveness to the paper tube and the outer periphery of the roll at the start and end portions. Means: A toilet roll in which 2-ply toilet paper is wound around a paper tube in a roll shape, the length of the toilet roll is 33 m or more and 100 m or less, the winding diameter is 100 mm or more and 134 mm or less, and one sheet is used. The basis weight per unit is 13 g / m2 or more and 16 g / m2 or less, and the frequency obtained when the toilet softness measuring device TSA rotates at a pushing pressure of 100 mN and the rotation speed is 2.0 per second and measures with a vibration sensor. The outer surface of TS7, which is the intensity of the maximum peak of the spectrum including 6500 Hz (TS7 value), is 13 dBV2 rms or more and 20 dBV2 rms or less, and the inner surface of TS7 is 30 dBV 2 rms or more and 40 dBV 2 rms or less. [Selection diagram] Fig. 1

Description

The present invention relates to a toilet roll in which two ply toilet paper on which two sheets are overlapped is wound in a roll around a paper tube.

In a toilet roll in which toilet paper is wound into a roll, the roll length is lengthened to save space when carrying and storing the roll. At this time, if an attempt is made to keep the winding diameter of the roll within a predetermined dimension so that it can be rotatably supported by a general toilet roll holder, it becomes necessary to reduce the paper thickness, and the texture and usability of the toilet paper. May be impaired.

On the other hand, Patent Document 1 pays attention to the softness of the toilet paper in the toilet roll in which the two-ply toilet paper is wound into a roll, and focuses on the softness of the toilet paper. By setting the value of TS7 measured by the above to 13 to 22 dBV ² rms, we propose a long-rolled toilet roll with excellent texture.

By the way, in this kind of toilet roll, the toilet paper is generally wound around a paper tube. At the time of manufacture, one end (starting end) of the toilet paper is adhered to the paper tube by the pickup glue, the other end (end) is adhered to the outer periphery of the roll by the tail seal glue after being wound around the paper tube by a predetermined length. .. As a result, the end portion of the toilet paper does not come apart before the start of use, and the start end portion of the toilet paper does not come off from the paper tube before the end of use.

Japanese Patent No. 6262439

However, when the toilet paper is softened to improve the texture as described above, due to the organizational structure of the toilet paper, generally, when the start end of the toilet paper is adhered to the paper tube, the pickup glue penetrates into the start end of the toilet paper. Is promoted. Similarly, when the end portion of the toilet paper is adhered to the outer circumference of the roll, the penetration of the tail seal glue into the outer circumference of the roll is promoted. As a result, the amount of glue (adhesive) that contributes to adhesion is reduced between the start end of the toilet paper and the paper tube, and between the end of the toilet paper and the outer circumference of the roll, and the adhesiveness is reduced, resulting in a toilet. There is a problem that the toilet paper is inadvertently peeled off from the outer circumference of the roll before the start of use of the roll, or the toilet paper is inadvertently peeled off from the paper tube before the end of use of the toilet roll.

The present invention has a long winding length per roll and is designed to save space during transportation and storage, and is excellent in both the texture of toilet paper and the adhesiveness of the start and end portions of toilet paper. The purpose is to provide toilet rolls.

As a result of diligent studies to solve the above problems, the present inventor is a toilet roll in which two ply toilet paper on which two sheets are overlapped is wound in a roll around a paper tube. The winding length of the toilet roll is 33 m or more and 100 m or less, the winding diameter is 100 mm or more and 134 mm or less, the basis weight per sheet is 13 g / m ² or more and 16 g / m ² or less, and the tissue softness measuring device. A rotor with a blade is pushed in from above with a pushing pressure of 100 mN against a sample of toilet paper installed on the sample table with the outer surface of the toilet roll facing up, and then rotated at a rotation speed of 2.0 per second. The outer surface of TS7, which is the intensity (TS7 value) of the maximum peak of the spectrum including the frequency of 6500 Hz, obtained when the vibration of the sample table is measured by the vibration sensor, is 13 dBV ² rms or more and 20 dBV ² rms or less, and is a tissue. 2. The number of rotations after the rotor with blade is pushed in from above with a pushing pressure of 100 mN against the sample of toilet paper installed on the sample table with the inner surface of the toilet roll facing up by the softness measuring device TSA. The inner surface of TS7, which is the intensity of the maximum peak of the spectrum including the frequency of 6500 Hz (TS7 value), which is acquired when the sample table is rotated at 0 seconds and the vibration of the sample table is measured by the vibration sensor, is 30 dBV ² rms or more and 40 dBV ² rms or less. It was found that the above-mentioned problem can be solved by the toilet roll.

Specifically, the present invention has the following configurations.
[1] A 2-ply toilet paper on which two sheets are overlapped is a toilet roll wound around a paper tube in a roll shape.
The winding length of the toilet roll is 33 m or more and 100 m or less, and the winding diameter is 100 mm or more and 134 mm or less.
The basis weight per sheet is 13 g / m ² or more and 16 g / m ² or less.
Rotation speed 2 after pushing the rotor with blade as a pushing pressure of 100 mN to the sample of toilet paper installed on the sample table with the outer surface of the toilet roll facing up by the tissue softness measuring device TSA. The outer surface of TS7, which is the intensity of the maximum peak of the spectrum including the frequency of 6500 Hz (TS7 value), which is obtained when the sample table is rotated at 0 seconds and the vibration of the sample table is measured by the vibration sensor, is 13 dBV ² rms or more and 20 dBV ² rms. Is below
The rotation speed after pushing the rotor with blade as a pushing pressure of 100 mN to the sample of toilet paper installed on the sample table with the inner surface of the toilet roll facing up by the tissue softness measuring device TSA. The inner surface of TS7, which is the intensity of the maximum peak of the spectrum including the frequency of 6500 Hz (TS7 value), which is obtained when the sample table is rotated at 2.0 seconds and the vibration of the sample table is measured by the vibration sensor, is 30 dBV ² rms or more and 40 dBV ² A toilet roll characterized by being less than or equal to rms.
[2] The toilet roll according to [1], wherein the toilet paper is composed of two sheets having different paper qualities.
[3] Toilet paper has double embossing in which embossing with different embossing conditions is formed on the entire surface of the two sheets, and the two sheets have embossed recesses of toilet paper. The toilet roll according to [1] or [2], which is overlapped so as to be located on both sides of the above.
[4] The toilet roll according to [1] or [2], wherein the toilet paper is single-embossed over the entire surface of the paper and is wound so that the embossed recess is on the outside of the roll. ..
[5] The toilet according to any one of [1] to [4], wherein the ratio R (TS7 inner surface / TS7 outer surface) between the inner surface of TS7 and the outer surface of TS7 is 1.80 or more and 2.20 or less. roll.

According to the present invention, the winding length per roll is long and space saving during carrying and storage is achieved, and both the texture of the toilet paper and the adhesiveness of the start and end portions of the toilet paper are both. Can provide excellent toilet rolls.

It is a perspective view which shows the structural example of the toilet roll which concerns on embodiment of this invention. It is a schematic sectional drawing of the tissue softness measuring apparatus TSA. It is the schematic sectional drawing of the example of the sample measured by the measuring apparatus TSA. It is a figure explaining the measurement principle of the measuring apparatus TSA. It is a figure explaining the measurement principle of the measuring apparatus TSA. It is a figure which shows the example of the measurement result by the measuring apparatus TSA. It is a schematic diagram which shows the example of the manufacturing equipment applicable to the manufacture of a toilet roll. It is a schematic diagram which shows the structural example of the gluing equipment.

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 for illustrative purposes only and are not intended to limit the invention.

(First Embodiment)

(Toilet roll)
FIG. 1 is a schematic perspective view for explaining a configuration example of a toilet roll according to an embodiment of the present invention.

With reference to FIG. 1, in the toilet roll 10 according to the embodiment of the present invention, the so-called two-ply toilet paper 13 on which two sheets 11 and 12 are superposed is formed on a paper tube 14 which is a cylindrical winding core. , It is wound in a roll shape by a predetermined length.

(Sheet)
Each of the two sheets 11 and 12, which are the constituent elements of the toilet paper 13, is obtained by making a slurry containing a pulp component which is a fiber raw material.

(Pulp component)
Examples of the pulp component include wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp include broadleaf pulp (blightwood kraft pulp (LKP)), coniferous tree pulp (coniferous kraft pulp (NKP)), sulfite pulp (SP), dissolved pulp (DP), soda pulp (AP), and unbleached craft. Examples thereof include chemical pulp such as pulp (UKP) and oxygen bleached kraft pulp (OKP). Examples thereof include semi-chemical pulp such as semi-chemical pulp (SCP) and chemiground wood pulp (CGP), mechanical pulp such as crushed wood pulp (GP) and thermomechanical pulp (TMP, BCTMP), but are not particularly limited. Examples of the non-wood pulp include cotton pulp such as cotton linter and cotton lint, non-wood pulp such as hemp, straw and bagasse, cellulose isolated from sea squirts and seaweed, chitin, chitosan and the like, but are not particularly limited. .. Examples of the deinked pulp include deinked pulp made from recycled paper, but the pulp is not particularly limited. As the pulp component, one of the above may be used alone, or two or more of them may be mixed and used. Since these pulp components greatly affect the quality of the toilet paper 13, they are appropriately blended in a predetermined type and blending ratio according to the required quality.

For example, as the pulp component, at least one selected from softwood pulp and hardwood pulp can be preferably used. The softwood pulp has long fibers and is strong, and can impart strength to the thin paper to be made. In addition, hardwood pulp has short fibers and is supple, and can provide uniformity, texture, softness, etc. to the tissue paper to be made. In the 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.

When softwood pulp and broadleaf pulp are used in combination as a pulp component, the L / N ratio indicating the mixing ratio (mass ratio) of softwood pulp and broadleaf pulp is preferably 10/90 to 90/10, for example. It is more preferably 20/80 or more, further preferably 30/70 or more, still more preferably 80/20 or less, still more preferably 70/30 or less.

(Optional ingredient)
Various chemicals may be added to the sheets 11 and 12 as optional components for the required quality and stable operation. Examples of the optional component include a dry paper strength agent, a wet paper strength agent, a softener, a bulking agent, a dye, a fragrance, a dispersant, a drainage improver, a pitch control agent, a yield improver, a sizing agent, and the like. Can be done. Examples of the dry paper strength agent include cationized starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC) and the like. Examples of the wet paper strength agent include polyamide epichlorohydrin, urea, melamine, and heat-crosslinkable polyacrylamide. Examples of the softener include anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric ion surfactants and the like. The above optional components may be used alone or in combination of two or more.

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

One end (starting end) of the toilet paper 13 is adhesively fixed to the outer periphery of the paper tube 14 with a pickup glue (not shown). The other end (termination) of the toilet paper 13 is adhesively fixed to the outer periphery of the roll of the toilet roll 10 with a tail seal glue. Hereinafter, the adhesive portion on the start end side of the toilet paper 13 is referred to as a start end portion, and the adhesive portion on the end end side is referred to as a terminal portion 15. Adhesion of the start end portion and the end portion 15 prevents the toilet paper 13 from peeling off from the paper tube 14 and peeling off from the outer circumference of the roll.

(Paper tube)
The paper tube 14 has a cylindrical shape, and the toilet paper 13 is wound around the paper tube 14 to form a toilet roll 10. The core diameter DC, which is the outer diameter of the paper tube 14, is set according to the size of the member (core core, hook, etc.) of the toilet roll holder for rotationally supporting the toilet roll 10, and is generally about 38 mm to 40 mm. be.

The material of the paper tube 14 may be any material as long as it can apply pickup glue to the outer peripheral surface thereof, pick up the starting end portion of the toilet paper 13, bond and fix it, and wind the toilet paper 13 around. It is often made of thick paper such as corrugated board and kraft paper. The paper tube 14 may be formed of, for example, a strip of paper wound in a spiral shape.

(Pickup glue)
The pickup glue is an adhesive for adhesively fixing the starting end portion of the toilet paper 13 to the outer peripheral surface of the paper tube 14. The type of the adhesive is not particularly limited, but it is preferable that the adhesive has an adhesive strength that can quickly bond and fix the toilet paper 13 and can withstand the tensile force when winding the toilet paper 13. 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) are preferably used because of their strong wet tack and excellent pick-up property.

(Tail seal glue)
The tail seal glue is an adhesive for adhesively fixing the end portion 15 of the toilet paper 13 to the outer peripheral surface of the roll. The type of the adhesive for the tail seal glue is not particularly limited, and it is preferable that the adhesive has an adhesive strength that allows the toilet paper 13 to be quickly adhered and fixed and does not easily peel off. As such an adhesive, a water-soluble adhesive is preferable, and a cellulose derivative adhesive is more preferable. Among the commercially available cellulose derivative adhesives, for example, Kanebinol TV995 and Kanebinol TV907 (both trade names, manufactured by Nippon NSC) are preferably used because of their strong wet tack and excellent drying property.

(Toilet roll length)
In the embodiment of the present invention, the roll 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 winding length can be determined, for example, by unwinding the toilet paper 13 from the toilet roll 10 and measuring the length thereof.

When the winding length of the toilet roll 10 is within this range, the length of the toilet paper 13 per roll is long, and it is possible to save space when carrying and storing the toilet roll 10. When the winding length of the toilet roll 10 exceeds 100 m, the winding diameter of the toilet roll 10 generally becomes large, and the toilet roll 10 becomes difficult to fit in a general toilet roll holder. Further, if the winding length of the toilet roll 10 is less than 33 m, the winding length per roll is short, and it is not possible to save space during carrying and storage.

(Diameter of toilet roll)
In the 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 in a roll shape, is 100 mm or more and 134 mm or less. The winding diameter DR can be measured using, for example, a caliper.

When the winding diameter DR of the toilet roll 10 is in this range, the toilet roll 10 can be accommodated in a general toilet roll holder and rotatably supported therein. If the winding diameter DR of the toilet roll 10 is larger than 134 mm, the toilet roll 10 is difficult to fit in a general toilet roll holder. Further, if the winding diameter DR of the toilet roll 10 is smaller than 100 mm, the winding length of the toilet roll 10 is limited, and it becomes difficult to save space during transportation and storage by increasing the winding length. Further, if an attempt is made to secure a long roll length of the toilet roll 10 with a small roll diameter DR, the paper thickness and bulkiness of the toilet paper 13 and the basis weight of the constituent sheets 11 and 12 are limited, resulting in a good usability and a good usability. It becomes difficult to secure the strength.

(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 laminated.

(Basis weight per sheet)
In the embodiment of the present invention, the basis weight per sheet of the two sheets 11 and 12 constituting the toilet paper 13 is 13 g / m ² or more and 16 g / m ² or less. The basis weight per sheet can be obtained by measuring the basis weight of the 2-ply toilet paper 13 according to the provisions of Japanese Industrial Standards JIS P8124 and dividing the basis weight by 2 of the number of plies. That is, the 2-ply toilet paper 13 is humidity-controlled according to the method specified in the Japanese Industrial Standard JIS P8111, and the humidity-controlled 2-ply toilet paper 13 is of a predetermined size with the two sheets 11 and 12 stacked. For example, cut into a size of 10 cm × 10 cm, measure the weight of the cut out 2-ply toilet paper 13, and divide the weight by 0.01 m ² of the cut-out area of the 2-ply toilet paper 13 to 2 The basis weight of the ply toilet paper 13 can be measured, and the basis weight can be divided by 2 of the number of plies to obtain the basis weight per sheet.

If the basis weight per sheet is less than 13 g / m ² , the strength will be low, and the usability will be poor due to a decrease in water absorption and the like. When the basis weight per sheet exceeds 16 g / m ² , the paper thickness becomes thicker and the winding diameter of the toilet roll 10 becomes larger. If the winding diameter of the toilet roll 10 is to be kept within the above range, it becomes difficult to secure the winding length of the toilet roll 10. Further, in order to obtain a winding length in the above range, it becomes necessary to reduce the thickness of the sheets 11 and 12, and the sheets 11 and 12 are crushed and the texture of the toilet paper 13 is impaired.

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

(Embossing)
The embossing is a process of forming an embossed convex portion on one surface of both sides of a sheet to be embossed and an embossed concave portion formed on the other surface on the back side of the embossed convex portion. The 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 nearly complementary shapes mesh with each other, or with a male (convex) embossing roll. It may be done with so-called "unmatched" embossed rolls, where the female (concave) embossed rolls are not the same shape and give shear to the sheet when they mesh, or male (convex) embossed steel. It may be done by a roll and a plain rubber roll.

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 embossed on each of the sheets 11 and 12 and then overlapped with each other. In this example, on the sheet 11 which is the outer side of the roll of the toilet roll 10, a large number of first embossed portions 11a protruding toward the overlapping surface side with the sheet 12 form a repeating pattern over the entire surface (entire surface) of the sheet. Is formed. Further, on the sheet 12 inside the roll, a large number of second embossed portions (not shown) are formed at predetermined intervals in an aligned state so as to project toward the overlapping surface side with the sheet 12 over the entire surface of the paper surface. Has been done.

As described above, in the first embodiment, both the first embossed portion 11a and the second embossed portion are projected toward the overlapping surfaces of the sheets 11 and 12, respectively, and embossed recesses are provided on both sides of the toilet paper 13. This makes both sides of the toilet paper 13 feel good, that is, both the surface of the sheet 11 on the outside of the roll and the surface of the sheet 12 on the inside of the roll are good. Further, by making the pattern of the first embossed portion 11a of the sheet 11 different from the pattern of the second embossed portion of the sheet 12, the texture of the surface of the sheet 11 (that is, the outer surface of the toilet paper 13) which is the outer surface of the roll is different. The texture of the surface of the sheet 12 (that is, the inner surface of the toilet paper 13), which is the inside of the roll, is different from that of the roll. The pattern of the first embossed portion 11a and the pattern of the second embossed portion may be any pattern other than the above, if necessary.

In addition, in order to suppress peeling of the sheets 11 and 12 constituting each layer of the toilet paper 13, the toilet paper 13 is provided with a joining embossed portion (not shown) for joining the constituent sheets 11 and 12 to each other. You may. The embossed portion for joining defines a joining region for integrally joining the sheet 11 and the sheet 12. The joining embossed portion may be formed, for example, on both side edges of the toilet paper 13 in the width direction (CD direction) so as to extend along the longitudinal direction (MD direction), and is also referred to as edge embossing. To. The embossed portion for joining may be formed so as not to protrude outward in the thickness direction from both the front and back surfaces of the toilet paper 13.

(TS7 value acquired by tissue softness measuring device TSA)
In the embodiment of the present invention, the TS7 value acquired by the tissue softness measuring device TSA (hereinafter, also simply referred to as the measuring device TSA) is defined for both sides of the toilet paper 13. Before referring to the specific range of TS7 values according to the embodiment of the present invention, the tissue softness measuring device TSA, the measuring principle, and the measurement used for acquiring the TS7 values are referred to with reference to FIGS. 2 to 6. The procedure will be described.

(Tissue softness measuring device TSA)
FIG. 2 is a schematic cross-sectional view of a tissue softness measuring device TSA manufactured by Emtec Electronic GmbH of Germany, which can be applied to obtain a TS7 value according to an embodiment of the present invention. The measuring device TSA is available from Nihon Rufuto Co., Ltd. (a distributor in Japan).

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

Of the above-mentioned parameter values such as TS7 (softness), TS750 (smoothness / roughness), and D (rigidity), the TS7 value and the TS750 value can be acquired by acoustic measurement by the tissue softness measuring device TSA. ..

(Measurement principle of acoustic measurement by tissue softness measuring device TSA)
The measurement principle of acoustic measurement by the tissue softness measuring device TSA will be described with reference to FIGS. 2 to 6.

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 the embodiment of the present invention, the sample 23 to be measured by the measuring device TSA 20 is a 2-ply toilet paper 13 composed of two sheets 11 and 12, but in FIG. 3, it is schematically shown in FIG. Sample 23 is shown as one sheet. Sample 23 has an uneven texture. Further, on the surface of the sample 23, raised portions, which are protrusions derived from the constituent fibers 23f, can be seen. Raising is also referred to as fiber fluffing, and the root portion of the raised fiber is present on or inside the sample 23.

As shown in FIG. 2A, in the tissue softness measuring device TSA 20, there is a vibration sensor 21a inside the sample table 21, and a blade 25a is rotated by a motor 25b above the sample table 21. There is a rotor 25 with a blade to make it. The sample 23 is attached to the sample table 21 like a drum head so that the surface to be measured faces upward, that is, the measurement surface faces the rotor 25 with a blade.

In the first measurement step, the rotor 25 with a blade is lowered by translation and pushed on the sample 23 by the blade 25a 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 sample 23 caused by this produces different types of vibration / noise. The generated vibration / noise is detected by the vibration sensor 21a. The frequency of the detected vibration or the like is analyzed using a PC, and a TS7 value is obtained. For example, by using the emtec measurement system, which is the software of Emtec, the TS7 value can be automatically acquired on the software.

In detail, with reference to FIG. 4, during measurement by the measuring device TSA 20, the blade 25a is in a constant vertical position, as illustrated by the movement from position (1) to (3) in the figure. Can be moved horizontally. Such horizontal movement of the blade 25a causes the position of the sample 23 to fluctuate and induce vertical vibration of the sample 23. The induced vibration frequency depends on the structural dimensions of the toilet paper 13 (for example, dimensions derived from creep, embossing, etc.) and the rotation speed of the blade 25a. The amplitude (intensity) of vibration depends on the height of the structure.

Further, referring to FIG. 5, the blade 25a that is horizontally moved at a constant vertical position during the above-mentioned measurement by the measuring device TSA 20 is exemplified by the movement from the position (i) to (iii) in the figure. As such, it advances horizontally on the surface of the sample 23. At this time, the horizontal vibration of the blade 25a itself is induced due to the momentary interruption due to the contact with the fiber 23f protruding from the sample surface and the vibration of the blade 25a.

Compared with FIG. 5A, in FIG. 5B, the fiber 23f is soft, and when the blade 25a and the fiber 23f come into contact with each other, the fiber 23f flexes greatly and the bending of the blade 25a is small. The amplitude of the horizontal vibration of the blade 25a is relatively small. The amplitude of the horizontal vibration of the blade 25a is the softness and hardness of the fiber 23f (rigidity of individual fibers), the internal structure of the material of the sample 23 (bulk, bond strength of the fibers), micro / macro compressibility, and additive chemicals. Depends on (softener, starch, dry strength agent) and the like. Further, the resonance frequency is constant depending on the material and geometrical dimensions of the sample 23, and is about 6,500 Hz.

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

The single spectrum based on the vertical vibration of sample 23, described with reference to FIG. 4, appears as the first maximal peak P ₁ of the spectrum viewed from the low frequency side. The intensity (amplitude) of the maximum peak P ₁ is the TS750 value which is an index of the “smoothness / roughness” of the sample 23. The smaller the TS750 value, the smoother the sample 23 is evaluated.

The single spectrum based on the horizontal vibration of the blade 25a, described with reference to FIG. 5, appears as the maximal peak P ₂ of the spectrum (around 6500 Hz) including the resonant frequency of 6500 Hz. The intensity (amplitude) of the maximum peak P ₂ 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.

In the measuring device TSA 20, subsequently, as a second measurement step, a D value representing the “rigidity” of the sample 23 can be obtained by deformation measurement by repeating a cycle of changing the load applied to the sample 23. .. A hand feel (HF) value can be obtained from the obtained D value, the above-mentioned TS7 value and TS750 value, the paper thickness, the basis weight, the number of plies, etc. by a non-linear algorithm. Since these D values and HF values are not the numerical values specified in the embodiments of the present invention, further description thereof will be omitted in the present specification.

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

(1) Preparation of sample Unwind the toilet paper 13 from the toilet roll 10 and cut out the sample 23 of the circular toilet paper having a diameter of 112.8 mm. The sample 23 includes two sheets 11 and 12 constituting the toilet paper 13 as a set. A sample punch manufactured by Emtec may be used for cutting out the sample 23.

(2) Mounting the sample The sample 23 is placed on the circular sample table 21 so that the measurement surface of the sample 23 faces upward (that is, the rotor 25 with a blade side). Next, the sample fixing ring 24 is pushed down so as to hold the outer circumference of the sample 23, and the sample 23 is locked to the sample table 21.

(3) Measurement The rotor 25 with a blade is pushed in from above the sample 23 with a pushing pressure of 100 mN. Next, the motor 25b is operated to rotate the rotor 25 with a blade at a rotation speed of 2.0 per second. The vibration of the sample table 21 at this time is measured by the vibration sensor 21a installed inside the sample table. The software is used to analyze the vibration frequency and automatically acquire the TS7 value.

(4) Calculation of average value By repeating the steps (1) to (3) above for one type of toilet roll 10, a total of 10 measurements are performed and the TS7 value is acquired as the average value.

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

(TS7 outer surface)
After the rotor 25 with a blade is pushed from above as a pushing pressure of 100 mN against the toilet paper 13 installed on the sample table 21 with the roll outer side of the toilet roll 10 facing up by the tissue softness measuring device TSA 20. The outer surface of TS7, which is the intensity (TS7 value) of the maximum peak of the spectrum including the frequency of 6500 Hz, obtained when the sample table 21 is rotated at a rotation speed of 2.0 per second and the vibration of the sample table 21 is measured by the vibration sensor 21a, is 13 dBV ² . It is rms or more and 20 dBV ² rms or less.

(Inside TS7)
The rotor 25 with a blade is pushed in from above as a pushing pressure of 100 mN against the toilet paper 13 installed on the sample table 21 with the inner surface of the toilet roll 10 facing up by the tissue softness measuring device TSA, and then rotated. The inner surface of TS7, which is the intensity of the maximum peak of the spectrum including the frequency of 6500 Hz (TS7 value), is 30 dBV ² rms, which is acquired when the vibration of the sample table 21 is measured by the vibration sensor 21a while rotating at several 2.0 seconds. It is 40 dBV ² rms or less.

When the outer surface of the TS7 is 13 dBV ² rms or more and 20 dBV ² rms or less, the surface of the toilet paper 13 (hereinafter, also referred to as the outer surface of the toilet paper) which is the outside of the roll of the toilet roll 10 becomes a soft and excellent surface. When the outer surface of TS7 is less than 13 dBV ² rms, the thickness of the toilet paper 13 is caused by the tissue structure in which the constituent fibers 23f and the like are raised on the surface when the tail seal glue adheres to the outer surface of the toilet paper 13. Permeation of glue in the direction is promoted. Therefore, when the end portion 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 portion 15 of the toilet paper 13 and the outer circumference of the roll (intersection) is reduced, and the toilet paper The adhesiveness of the terminal portion 15 of 13 is reduced. When the outer surface of TS7 is larger than 20 dBV ² rms, the softness of the outer surface of the toilet paper 13 decreases as the value increases.

When the inner surface of TS7 is 30 dBV ² rms or more and 40 dBV ² rms or less, the surface of the toilet paper 13 (hereinafter, also referred to as the inner surface of the toilet paper) which is the inside of the roll of the toilet roll 10 has a moderately soft texture, while the tail. When the seal glue or pickup glue adheres, the penetration rate of the glue into the toilet paper is moderately suppressed. Therefore, in the adhesion of the end portion 15 of the toilet paper 13 to the outer periphery of the roll and the adhesion of the start end portion of the toilet paper 13 to the paper tube 14, the amount of glue (adhesive) that contributes to the adhesion is secured, and good adhesion is achieved. Obtainable. When the inner surface of TS7 is less than 30 dBV ² rms, the inner surface of the toilet paper 13 becomes soft and the texture is improved, but the adhesiveness at the start end portion and the end portion 15 is lowered. When the inner surface of TS7 is larger than 40 dBV ² rms, the surface of the toilet paper 13 has a reduced softness and a poor texture.

(Example of manufacturing method and manufacturing equipment applicable to the embodiment of the present invention)
An example of a method and equipment applicable for manufacturing a toilet roll according to an embodiment of the present invention will be described with reference to FIGS. 1, 7, and 8. The toilet roll 10 can be manufactured, for example, as follows.

(Manufacturing of raw rolls)
The original rolls 11R and 12R for manufacturing the sheets 11 and 12, which are the components of the toilet paper 13, are manufactured. Specifically, using a paper machine (not shown), wide (several to twenty-odd times the width of the toilet roll) and long sheets 11L and 12L are made from the papermaking slurry (paper material). While winding, the original rolls 11R and 12R from which the sheets 11L and 12L are wound are manufactured. As the paper machine, for example, known paper machines such as a twin wire former method, a circular net former method, a suction prestoformer method, and a crescent former method can be used.

The paper machine may include a creping section for performing crepe processing. In the crepe section, in the raw fabric roll manufacturing process, while the sheet (web) to be machined is dried, the sheet is provided with very fine wrinkles called crepes by a crepe doctor, if necessary. Can be done. The crepe can give the sheet softness, bulkiness (bulk feeling), absorbency, aesthetic appearance (crepe shape), and a good touch feeling.

Further, the paper machine may be provided with a calendar unit. In the calendar unit, the dried sheet can be subjected to a calendar process in which the sheets are sandwiched and pressed from above and below by a pair of calendar rolls, if necessary. As a result, the sheets 11L and 12L are compressed, and the paper thickness is adjusted and made uniform, and the surface is smoothed. The calendering process suppresses protrusions (raised) due to fibers on the sheet surface and generally reduces softness. The calender processing unit may be provided separately from the paper machine, and the calender processing may be performed in any manufacturing process after the raw roll manufacturing process. The calendar processing may be performed in a plurality of stages.

(Manufacturing of toilet rolls)
Toilet rolls are manufactured using the original rolls 11R and 12R. FIG. 7 is a schematic diagram showing an example of a manufacturing facility applicable to the manufacturing of a toilet roll according to an embodiment of the present invention. FIG. 7 is for illustrative purposes only and does not limit the present invention.

The raw roll 11R and the raw roll 12R are rotatably attached to the raw roll stand 70, and the sheet 11L and the sheet 12L are fed while being rotationally driven by a base paper sheet feeding device (not shown).

The sheet 11L and the sheet 12L unwound from the raw roll 11R and the raw roll 12R are conveyed to the embossed portion 76 arranged on the downstream side of the raw roll stand 70. Further, a winding section 77 and a terminal processing section 78 are arranged in order on the downstream side of the embossed section 76.

The embossed portion 76 is simply a unit that embosses the sheets 11L and 12L to form an embossed sheet.

The embossing unit 76 includes two sets of embossing roll units 71 and 72 and one embossing roll unit 75 for joining.

The embossing roll units 71 and 72 have an embossing roll and a backup roll, respectively. The embossing roll of the embossing roll unit 71 is rotatable, and an uneven portion corresponding to the embossing pattern of the first embossing portion 11a of the sheet 11 shown in FIG. 1 is formed on the outer peripheral surface of the embossing roll. Similarly, the embossed roll of the embossed roll unit 72 is rotatable, and the outer peripheral surface of the embossed roll of the embossed roll unit 72 has an embossed pattern of a second embossed portion (not shown) of the sheet 12 shown in FIG. The uneven portion corresponding to the above is formed.

On the upstream side of each of the embossed roll units 71 and 72, two rotatable guide rollers 73 and 74 for guiding the sheets 11L and 12L corresponding to the embossed roll units 71 and 72 are provided.

In the manufacturing apparatus shown in FIG. 7, the embossing unit 76 may have (i) single embossing, (ii) double embossing, or (ii) double embossing, depending on the paper passing path of the sheets 11L and 12L and the presence or absence of pressing by the embossing roll units 71 and 72. (Iii) It is configured so that no embossing can be selectively performed.

(I) In the case of single embossing FIG. 7 shows an example of a paper passing path of the sheets 11L and 12L in the case of performing single embossing. When performing single embossing, the sheets 11L and 12L unwound from the original rolls 11R and 12R are both wound around the guide roller 73 and overlapped with each other, and are guided toward the embossing roll unit 71. The embossing roll unit 71 includes an embossing roll and a backup roll movably arranged along the direction facing the embossing roll, and the stacked sheets 11L and 12L are inserted between them. As a result of the backup roll being pressed against the outer peripheral surface of the embossing roll with a predetermined pressure, embossing processing common to the sheets 11L and 12L passing between them is performed.

(Ii) In the case of double embossing When double embossing is performed, the sheet 11L unwound from the original roll 11R is wound around the guide roller 73 and guided toward the embossing roll unit 71 to be embossed. It is inserted between the embossing roll and the backup roll of the roll unit 71. Similarly, the sheet 12L unwound from the original roll 12R is wound around the guide roller 74 and guided toward the embossed roll unit 72. The embossing roll unit 72 includes an embossing roll and a backup roll movably arranged along a direction facing the embossing roll, and a sheet 12L is inserted between them. As a result of each backup roll being pressed against the outer peripheral surface of the corresponding embossed roll with a predetermined pressure, the sheets 11L and 12L passing between them are each embossed.

(Iii) In the case of no embossing In the case of so-called no embossing, in which the sheet 11L and 12L are not embossed over the entire surface (entire surface), the sheets 11L and 12L are used for double embossing. The paper is passed through the same paper path as either the paper path or the paper path for single embossing, but the emboss roll unit does not press the backup roll against the outer peripheral surface of the emboss roll.

The embossing roll unit 75 for joining is arranged on the downstream side of the embossing roll units 71 and 72. The joining embossed roll unit 75 has an embossed wheel and a receiving roll that face each other. The receiving 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 embossing portion for joining is formed on the embossed wheel and the outer peripheral surface of the receiving roll.

The sheet 11L and the sheet 12L that have passed through the embossing roll unit are passed between the embossing wheel of the joining embossing roll unit 75 and the receiving roll in a state of being overlapped with each other, and are wound around the receiving roll. At this time, if necessary, the embossing wheel is pressed against the receiving roll that is driven and rotated by a fluid pressure cylinder with a predetermined pressing force, so that the embossing process for joining the laminated body of the sheet 11L and the sheet 12L is performed. Is provided, and an embossed portion for joining is provided to prevent peeling.

The embossed portion for joining is optional and not essential in the embodiment of the present invention. However, when the toilet roll is a no-embossed product and the sheet is likely to be peeled off in the 2-ply toilet paper, the embossed portion for joining is preferably provided.

In this example, at least the uneven portion of the embossed rolls of the embossed roll units 71 and 72 and the embossed roll unit 75 for joining is made of metal, but the surface portion of the backup roll is made of elastically deformable hard synthetic rubber or the like. It is made of a hard rubber-like elastic body.

By embossing with a male (convex) embossed steel roll and a plain rubber roll, the textures of one surface and the other surface of the embossed sheet can be significantly different. For example, in the embossed convex portion formed by the embossed steel roll, the contact with the plain rubber roll crushes the raised surface of the sheet based on the constituent fibers of the sheet, reducing the softness and increasing the smoothness.

The wide toilet paper 13L formed by the sheets 11L and the sheets 12L laminated in the embossing section 76 is sent to the winding section 77 arranged on the downstream side thereof.

In the winding unit 77, the tip of the toilet paper 13L sent out from the embossing unit 76 is attached to a wide (that is, axially long) paper tube 14L which is the winding core via an adhesive (pickup glue). Wrap it.

The toilet paper 13L is wound around a paper tube 14L by a predetermined length to form a roll 86 which becomes a wide (that is, a large dimension in the CD direction) toilet roll 10L, and the end of the winding end of the toilet paper 13L is not shown. Cut by the cutting means of. The obtained roll 86 is sent to the end processing unit 78.

The end processing unit 78 glues the end portion of the end of the roll 86 sent from the winding unit 77 to the surface (outer peripheral surface of the roll) of the roll 86 with an adhesive (tail seal glue) to form a wide toilet roll 10L. Form and prevent the wide toilet roll 10L from being unwound.

Prior to cutting the toilet paper 13L in the winding unit 77 for each predetermined length, breaking perforations crossing the width direction of the toilet paper 13L are formed at regular intervals along the longitudinal direction (MD direction) of the toilet paper 13L. It may be formed every time. Any known perforation forming means can be used to form the perforations for breaking. However, the formation of such breaking perforations is optional and not essential in the embodiments of the present invention.

The wide toilet roll 10L is then carried out from the end treatment portion 78 to a cutting portion (not shown) and cut to a predetermined width according to the product specifications and the like to become individual toilet rolls 10.

On the other hand, in the winding unit 77, the tip portion of the toilet paper 13L generated by cutting the toilet paper 13L for each predetermined length (that is, the end portion of the toilet paper 13L on the original rolls 11R and 12R side) is the winding unit. A new axially long core to be arranged on 77 is wound around the long core via an adhesive, and the toilet paper 13L is again wound around this axially long core by a predetermined length. There is.

FIG. 8 is a diagram showing a configuration example of the gluing equipment 80 applicable to the winding unit 77 and the end processing unit 78. With reference to FIG. 8, a step of adhering one end (starting end) of the toilet paper 13L to the paper tube 14L with a pickup glue and a step of adhering the other end (end) to the outer periphery of the roll with a tail seal glue will be described in more detail. do. In FIG. 8, R1 to R5 indicate rolls.

First, as shown in part A of FIG. 8, a cylindrical or cylindrical (bar) -shaped mandrel shaft 81 is inserted into the wide paper tube 14L, and the wide paper tube 14L is fixed to the mandrel shaft 81. Next, as shown in the portion B of FIG. 8, the pickup glue 83 is applied to the wide paper tube 14L using the coater 82 to form the pickup glue coating portion 84. Instead of coating with the coater 82, the pickup glue may be applied by any known method such as spraying with a spray. Coating with a coater 82 is preferable from the viewpoint that glue can be reliably applied to a desired portion.

The pickup glue coating portion 84 may be formed along the width direction (that is, parallel to the longitudinal direction) of the wide paper tube 14L, and is not necessarily formed continuously over the entire width direction (longitudinal direction). You don't have to be

Next, as shown in the portion 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 portion 84 formed on the wide paper tube 14L is formed. And the toilet paper 13L delivered from the embossing section 76 via the delivery roller 85 are crimped. By this operation, the wide paper tube 14L and the toilet paper 13L can be adhered and fixed.

Next, as shown in the D portion of FIG. 8, the mandrel shaft 81 is rotated in the circumferential direction of the wide paper tube 14L by a meshing gear or the like (not shown). By this rotation, the toilet paper 13L is wound around the wide paper tube 14L, and the roll 86 is formed. The toilet paper 13L is wound into a wide paper tube 14L by a predetermined length and then cut. By this cutting, the end of the winding of the toilet paper 13L is formed.

Next, as shown in the E portion of FIG. 8, the tail seal glue is applied to the end portion of the toilet paper 13L using the coater 87 to form the tail seal glue coating portion 88. Instead of coating with the coater 87, the tail seal glue may be applied by any known method such as spraying with a spray. Coating with the coater 87 is preferable from the viewpoint that the glue can be reliably applied to the desired portion.

The tail seal glue coating portion 88 may 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 continuously formed at the end portion. The tail seal glue coating 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 where the position of the long base paper abuts on the outer peripheral surface of the roll.

Depending on the setting of the coater 87, the tail seal glue coating portion 88 may be formed on the end portion of the toilet paper 13L (inner surface of the toilet paper 13), or the outer peripheral surface of the roll (specifically, the end portion of the toilet paper 13L). It is also possible to form it on the outer surface portion of the toilet paper 13 with which the toilet paper 13 comes into contact.

However, in the embodiment of the present invention, the tail seal glue coating portion 88 is formed on the inner surface of the toilet paper 13 which is the surface of the toilet paper 13L having the relatively higher TS7 value. This is because when 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 tissue structure (raised, etc.) of the surface, which contributes to adhesion. This is because the amount of glue to be applied is reduced and the adhesiveness is lowered.

Next, as shown in the F portion of FIG. 8, the tail seal glue coating portion 88 formed at the end portion of the toilet paper 13L and the outer peripheral surface of the roll 86 are crimped. By this operation, the end portion of the toilet paper 13L and the outer peripheral surface of the roll 86 are adhesively fixed, and a log of the wide toilet roll 10L is formed.

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

(Action effect)
According to the present embodiment, the basis weight per sheet of the two sheets 11 and 12 constituting the 2-ply toilet paper 13 is 13 g / m ² or more and 16 g / m ² or less, and the appropriate strength and water absorption amount. The roll length of the toilet roll 10 is 33 m or more and 100 m or less and the roll diameter is 100 mm or more and 134 mm, and the length of the toilet paper 13 per roll is long, which saves space during transportation and storage. The designed toilet roll 10 can be obtained.

In addition, the TS7 value acquired by the tissue softness measuring device TSA 20 for the 2-ply toilet paper 13 is 13 dBV ² rms or more and 20 dBV ² rms or less on the outer surface of TS7, and 30 dBV ² rms or more and 40 dBV ² rms or less on the inner surface of TS7. The outer surface (the surface on the outside of the roll) of the toilet paper 13 is excellent in softness and texture, and the inner surface (the surface on the inside of the roll) of the toilet paper 13 has good softness.

Further, due to the difference in the organizational structure between the outer surface side and the inner surface side of the toilet paper 13 appearing in the difference between the values on the outer surface of the TS7 and the inner surface of the TS7, the toilet paper 13 penetrates into the inner surface side at the start and end portions of the toilet paper 13. The permeability of adhesives (pickup glue and tail seal glue) is suppressed.

Therefore, according to the present embodiment, in the two-ply toilet roll 10, it is possible to save space during carrying and storage, improve the texture of the toilet paper 13, and refer to the paper tube 14 at the starting end of the toilet paper 13. It is possible to achieve both adhesiveness and / or adhesiveness of the end portion of the toilet paper 13 to the outer periphery of the roll.

As described above, with reference to FIG. 1, the configuration and action / effect of the toilet roll 10 according to the first embodiment of the present invention have been described. In the first embodiment, an example of using double embossing as one of the means for making the TS7 values (that is, the outer surface of TS7 and the inner surface of TS7) on both sides of the toilet paper 13 different is shown.

In the example of using double embossing, the control of the TS7 value (TS7 outer surface and TS7 inner surface) on both sides of the toilet paper 13 is a condition of embossing applied to each of the two sheets 11 and 12 constituting the toilet paper 13. Can be done by differentiating. For example, embossing pattern, size of embossed convex part (diameter, etc., mm), density of embossed convex part (piece / cm ² ), height of embossed convex part (mm), embossing pressure (gf / cm ² ). ), By appropriately setting the paper thickness and density after applying the embossing pressure, etc., the texture of the surface of the sheets 11 and 12 that the user will touch during use can be made different on both sides. The TS7 value can be controlled.

In the toilet roll 10 according to the embodiment of the present invention, double embossing is not an essential component. In the embodiment of the present invention, as long as the TS7 values (TS7 outer surface and TS7 inner surface) on both sides of the toilet paper 13 can be set within the above-mentioned predetermined TS7 value range according to the present invention, the TS7 value control means is used. Not limited.

(Second embodiment)
Next, a second embodiment of the present invention will be described. Unless otherwise stated, the configurations applicable to the first embodiment are applicable to the present embodiment.

In the toilet roll according to the second embodiment of the present invention, the toilet paper is characterized in that it is formed by using two sheets having different paper qualities.

With reference 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 ² rms or more and 20 dBV ² rms or less on the outer surface of TS7, and 30 dBV ² rms or more and 40 dBV ² on the inner surface of TS7. It is rms or less. In the second embodiment, the toilet paper 13 is formed by using two sheets 11 and 12 having different paper qualities, whereby the texture of the surface of the sheet 11 (outer surface of the toilet paper 13) on the outside of the roll and the texture of the surface (outer surface of the toilet paper 13). The texture of the surface of the sheet 12 (inner surface of the toilet paper 13) on the inside of the roll is different from that of the sheet 12 to obtain a desired TS7 value and a difference between the front and back sides thereof.

"Paper quality" refers to the quality and properties of paper, and the paper quality of sheets 11 and 12 refers to the quality and properties of 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, in the sheets 11 and 12, pulp components, which are aggregates of cellulose fibers taken out from plants such as wood, are dispersed in water to form a papermaking slurry (paper material), which is used as a net or a sill. The fibers are entangled, dehydrated and dried by flowing out to form a uniform thin layer on top. In this process, various treatments / processes such as addition / coating of chemicals and pressurization of the sheets 11 and 12 are performed to complete the sheets 11 and 12. The various processes / processes include, for example, crepe processing, calendar processing, embossing and the like.

The two sheets 11 and 12 having different paper qualities according to the present embodiment are, for example, among the types and amounts of raw materials such as pulp components and additive chemicals, and various treatments / processes on the sheets 11 and 12. It can be obtained by making at least one different from each other.

As described with reference to FIG. 5, the TS7 value (TS7 outer surface and TS7 inner surface) representing softness is affected by the brushing derived from the constituent fibers protruding from the surface of the toilet paper 13. Therefore, in the present embodiment, two sheets 11 and 12 having different paper qualities are used in terms of properties that can affect the TS7 value, such as a raised state derived from the constituent fibers protruding from the sheet surface. However, it is particularly preferable.

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

(1) A method of differently beating the pulp in the sheet.
That is, it is a method of making two sheets 11 and 12 using pulps having different degrees of beating.

Pulp is an aggregate of cellulose fibers. By beating the pulp, the surface of each cellulose fiber is fibrillated and fluffed, the area for hydrogen bonding is increased, and the bonding between individual cellulose fibers is promoted. When the cellulose fibers are bonded to each other, the number of individual cellulose fibers that can move freely is reduced, and the surface raising of the paperned sheets 11 and 12 is reduced. As the degree of beating increases, the bonds between the fibers progress, the voids between the fibers decrease, and the densities of the sheets 11 and 12 increase.

On the other hand, when the degree of beating is low, the degree of pulp being cut or crushed is low, and the surface of individual cellulose fibers is less fluffed (fibrillated). Therefore, it is difficult for the individual cellulose fibers to bond with each other by hydrogen, and the surface of the paperd sheets 11 and 12 has a large amount of brushing due to the free cellulose fibers.

As described above, by varying the degree of beating of the pulp, the amount of raising of the papern sheets 11 and 12 can be adjusted. The degree of beating (beating degree) can be expressed by, for example, freeness (JIS P8121). As the beating progresses, the drainage of the pulp becomes worse and the freeness becomes lower. When papermaking is performed using the same type of pulp with different beating degrees, the greater the decrease in freeness (freeness down width) from the freeness of unbeaten pulp, the less the surface of the papern sheets 11 and 12 is raised. It becomes a tendency to become.

Therefore, by manufacturing the sheets 11 and 12 using pulps having different degrees of beating, it is possible to obtain the sheets 11 and 12 having different paper qualities (raised state of the surface). Thereby, the TS7 value can be adjusted so that the outer surface of the TS7 and the inner surface of the TS7 are different from each other.

(2) A method of differentiating the additive chemicals (softener) in the papermaking slurry (paper material).
In order to improve the softness and feel of the sheets 11 and 12, it is common practice to add a softener to the sheet papermaking slurry.

Pulp is an aggregate of cellulose fibers, which are anionic. When, for example, a cationic surfactant is used as the softening agent, the cationic surfactant and the anionic cellulose fiber are bonded to each other, and it becomes difficult for the individual cellulose fibers to hydrogen bond with each other. On the surface of twelve, there is a lot of brushing due to the free cellulose fibers.

Therefore, by producing the sheets 11 and 12 using slurries for papermaking in which the amounts of the cationic surfactants added are different from each other, the sheets 11 and 12 having different paper qualities (state of raised surface) can be obtained. As the amount of the cationic surfactant added is increased, the amount of brushing increases. Thereby, the TS7 value can be adjusted so that the outer surface of the TS7 and the inner surface of the TS7 are different from each other.

(3) A method of making the pulp mixing ratio in the sheet different.
Examples thereof include a method of making two sheets 11 and 12 using paper materials having different mixing ratios of pulp components. For example, when hardwood pulp (L material) and / or softwood pulp (N material) is used as the pulp component of the sheet, the blending ratio (L / N ratio) thereof is different between the sheet 11 and the sheet 12.

In general, since hardwood pulp is supple, a sheet containing hardwood pulp is soft, smooth, and feels good to the touch. On the other hand, softwood pulp has long fibers and strength, and can impart strength to the sheet to be machined. By utilizing the difference in properties between hardwood pulp and softwood pulp at the cellular level and making the compounding ratio (L / N ratio) of the pulp components different, the two sheets 11 having different paper qualities from each other. , 12 can be obtained.

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

The methods listed above are for illustrative purposes only and are not limiting. These methods can be used alone or in combination. In addition, these methods may be used in combination with other methods other than those listed above. For example, in general, the larger the basis weight of a sheet, the greater the number of brushes, and two sheets with different basis weights, alone, or in combination of this method and the methods listed above, have different paper qualities. Sheets 11 and 12 may be obtained.

In this way, by forming the toilet paper 13 using the sheets 11 and the sheets 12 having different paper qualities, the texture of the surface of the sheet 11 on the outside of the roll and the texture of the surface of the sheet 12 on the inside of the roll are made different. be able to. Further, by appropriately selecting the paper quality of the sheet 11 and the sheet 12, both the touch of both sides of the toilet paper 13, that is, the touch of the surface of the sheet 11 on the outside of the roll and the touch of the surface of the sheet 12 on the inside of the roll can be obtained. Can be good.

(Action effect)
In the second embodiment, the two-ply toilet paper 13 is configured by using two sheets 11 and 12 having different paper qualities, and the TS7 value (TS7 outer surface and TS7) according to the embodiment of the present invention is used. It is a means to achieve the size of the inner surface). This embodiment can be realized by making the degree of beating of the pulp, the type and the amount of the 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 essential to further process the laminated body of the two sheets 11 and 12 after being overlapped in order to provide the front and back difference of the TS7 value. Therefore, the present invention can be applied to a toilet roll which is a so-called no-embossed product in which the entire surface (entire surface) of the toilet paper 13 is not embossed.

(Third embodiment)
Next, a third embodiment of the present invention will be described. Unless otherwise stated, the configurations applicable to the above embodiments are applicable to the present embodiment.

In the toilet roll according to the third embodiment, the toilet paper is characterized in that a single emboss is attached to the entire surface (entire surface) of the paper, and the embossed recess is wound so as to be on the outside of the roll.

The toilet roll 10 according to the third embodiment comprises the entire toilet paper 13 (that is, sheets 11 and 12) as one means for differentiating the textures (particularly, TS7 value) on both sides of the toilet paper 13. Laminated sheets) are collectively embossed.

For example, on the toilet paper 13, a large number of embossed portions 11a protruding inside the roll of the toilet roll 10 as shown in FIG. 1 may be formed in a repeating pattern over the entire surface of the paper. By projecting the embossed portion 11a of the toilet paper 13 to the inside of the roll, the surface of the sheet 11 on the outside of the roll is made to feel good on the toilet paper 13, and the surface of the sheet 11 on the outside of the roll and the inside of the roll are formed. The texture (TS7 value) with the surface of the sheet 12 can be made different. The pattern of the embossed portion 11a shown in FIG. 1 is an example and does not limit the present invention.

In the present embodiment, as non-limiting examples of the TS7 value control means, the embossed pattern formed by embossing, the size of the embossed convex portion (diameter, etc., mm), and the density of the embossed convex portion (piece / piece /). cm ² ), the height of the embossed protrusion (mm), etc. may be different. Also, the type of embossing roll used for embossing is selected (for example, whether it is performed by a male (convex) embossing roll and a female (concave) embossing roll, and at that time, the meshing is matched or matched. The TS7 value is controlled to be different depending on the combination of rolls, such as whether it is absent or is performed by a male (convex) embossed steel roll and a plain rubber roll), the hardness of the embossed roll, and the pressure of embossing. be able to.

(Action effect)
In the third embodiment, the front and back differences in the texture (TS7 value) of the toilet paper 13 are provided by single embossing. According to the present embodiment, it is possible to improve the texture of the toilet paper 13 and the adhesiveness of the start end portion and the end portion of the toilet paper 13 with a simple configuration.
As a means for providing a front-to-back difference in the texture (TS7 value) of the toilet paper 13, double embossing is performed in the first embodiment, and two sheets 11 and 12 having different paper qualities are used in the second embodiment. In the third embodiment, single embossing is performed, but the present invention is not limited to this, and in addition to using two sheets 11 and 12 having different paper qualities, double embossing or single embossing may be performed.

(Fourth Embodiment)
Next, a fourth embodiment of the present invention will be described. Unless otherwise stated, the configurations applicable to the above embodiments are applicable to the present embodiment.

The toilet roll according to the fourth embodiment is characterized in that the ratio R (TS7 inner surface / TS7 outer surface) between the inner surface of TS7 and the outer surface of TS7 is 1.80 or more and 2.20 or less.

In the toilet roll 10 according to the embodiment of the present invention described above, the TS7 value is such that the outer surface of TS7 is 13 dBV ² rms or more and 20 dBV ² rms or less, and the inner surface of TS7 is 30 dBV ² rms or more and 40 dBV ² rms or less). In the fourth embodiment, the ratio R (TS7 inner surface / TS7 outer surface) between the inner surface of TS7 and the outer surface of TS7 is set to 1.80 or more and 2.20 or less.

The essence of the present invention is to provide the toilet paper 13 with a difference between the front and back sides of the texture (TS7 value) in order to achieve both the texture of the toilet paper 13 and the adhesiveness to the paper tube 14 and the outer periphery of the roll, and the outer surface of the toilet paper 13. This is because the adhesiveness of the inner surface of the toilet paper 13 to the paper tube 14 and the outer periphery of the roll has been improved while ensuring the softness of the toilet paper.

Since the method of using the toilet paper 13 differs depending on the user and the time, the surface of the toilet paper 13 (the surface that the user mainly touches during use) is not limited to the outer surface. Therefore, from the viewpoint of texture, it is preferable that the difference between the front and back surfaces of the outer surface and the inner surface is small. The difference between the front and back surfaces of 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 front and back sides.

On the other hand, if the value of the ratio R (TS7 inner surface / TS7 outer surface) is to be reduced so as to reduce the front-to-back difference, the adhesiveness tends to decrease when the texture is emphasized, and the texture tends to decrease when the adhesiveness is emphasized. Will be. Therefore, from the viewpoint of the balance between texture and adhesiveness, it is desirable that the ratio R (TS7 inner surface / TS7 outer surface) is large to some extent.

Therefore, in the present embodiment, the ratio R (TS7 inner surface / TS7 outer surface) is preferably 2.20 or less, more preferably 2.00 or less, and adheres to the texture from the viewpoint of reducing the difference between the front and back surfaces of the texture. From the viewpoint of balancing with sex, it is preferably 1.80 or more, and more preferably 1.90 or more.

Using the manufacturing apparatus shown in FIG. 7, a toilet roll was manufactured through the following manufacturing steps.
(A) Softwood bleached kraft pulp (NBKP): A plurality of sheets were made using a papermaking slurry (paper material) in which hardwood bleached kraft pulp (LBKP) had a pulp composition of 30% by mass: 70% by mass. At this time, for some of the plurality of sheets, at least one of pulp beating degree, amount of additive chemical (softener) added, sheet basis weight, paper thickness, crepe processing condition, and calender processing condition is set. The paper was made differently.
(B) Two of the plurality of paper-made sheets were laminated to form one laminated sheet.
(C) Single embossing of the pattern illustrated in FIG. 1 was performed on the entire paper surface of the laminated sheet, in which the embossing on one surface is concave and the embossing on the other surface is convex.
(D) The starting end portion of the laminated sheet was pressed against a paper tube coated with pickup glue to be adhesively fixed, and the embossed recess was wound around the paper tube in a roll shape so as to be on the outside of the roll.
(E) When the winding length reaches a predetermined length, the winding end of the laminated sheet is cut, and the end portion of the laminated sheet is adhesively fixed to the outer periphery of the roll with a tail seal glue to form a wide toilet roll. Obtained.
(F) A wide toilet roll was cut into a predetermined width dimension, and a single-embossed 2-ply toilet paper was wound into a roll to manufacture a toilet roll.
(G) The steps (b) to (f) were repeated to obtain 10 types of toilet rolls from Samples 1 to 10.

The following measurements and evaluations were performed on the toilet rolls of Samples 1 to 10. The measurement was carried out by adjusting the humidity of the sample in an environment (temperature 23 ± 1 °, humidity 50 ± 2% RH) according to Japanese Industrial Standards JIS P8111.

<Measurement>
[Toilet roll length [m]]
While unwinding the toilet paper from the manufactured toilet roll, the length of winding the toilet paper around the paper tube from the end to the start was measured. The measurement was performed in 0.5 m increments and the fractions were rounded down.

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

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

[Basis weight (per sheet) [g / m ² ]]
Toilet paper was pulled out from the toilet roll, the basis weight of the 2-ply toilet paper 13 was measured according to Japanese Industrial Standards JIS P8124, and the basis weight was divided by 2 of the number of plies to obtain the basis weight per sheet. Specifically, the 2-ply toilet paper 13 is humidity-controlled according to the method specified in the Japanese Industrial Standard JIS P8111, and the humidity-controlled 2-ply toilet paper 13 is 10 cm × with the two sheets 11 and 12 stacked. Cut out to a size of 10 cm, measure the weight of the cut out 2-ply toilet paper 13, divide the weight by 0.01 m ² of the cut-out area of the 2-ply toilet paper 13, and divide the 2-ply toilet paper. The basis weight of 13 was measured, and the basis weight was divided by 2 of the number of plies to obtain the basis weight per sheet.

[Paper thickness (per set of 2-ply toilet paper) [μm]]
Toilet paper was pulled out from the toilet roll, and the thickness of the two-ply toilet paper, which was a set of two sheets, was calculated according to the International Organization for Standardization standard ISO 12625-3.

[TS7 outer surface and TS7 inner surface)]
Using the tissue softness measuring device TSA, the outer surface of the TS7 with the outer surface of the toilet paper (the surface outside the roll of the toilet roll) as the measurement surface and the outer surface of the toilet paper (toilet roll toilet) according to the procedure for measuring the TS7 value. The inner surface of TS7 was acquired with the surface on the outer side of the roll as the measurement surface.

[Ratio R (TS7 inner surface / TS7 outer surface)]
By dividing the value of the inner surface of TS7 by the value of the outer surface of TS7, the ratio R (inner surface of TS7 / outer surface of TS7) between the inner surface of TS7 and the outer surface of TS7 was obtained.

<Evaluation>
Sensory evaluation was performed on the following items, and the results are indicated by symbols (◎: excellent, 〇: good, △: acceptable, ×: not possible). The sensory evaluation was a relative evaluation between samples having the same winding length of the toilet roll.

[Texture of the outer surface of toilet paper]
The softer the texture of the outer surface of the toilet paper, the better the texture (◎).

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

[Difference in texture between the outer and inner surfaces of toilet paper <front and back difference>]
The smaller the difference in texture between the outer and inner surfaces of the toilet paper, the better the difference between the front and back (◎).

[Adhesion with pickup glue]
The ease of peeling from the paper tube at the beginning of the toilet paper was evaluated when the operation of crushing the toilet roll in the radial direction, then rotating it 90 degrees and crushing it in the radial direction was repeated 10 times. The more difficult it is to peel off, the better the adhesiveness (◎).

[Adhesion with tail seal glue]
The ease with which the end portion of the toilet paper was peeled off from the outer circumference of the roll was evaluated when the operation of crushing the toilet roll in the radial direction, then rotating it 90 degrees and crushing it in the radial direction was repeated 10 times. The more difficult it is to peel off, the better the adhesiveness (◎).

The test results are shown in Tables 1 and 2.

As shown in Tables 1 and 2, in each of Samples 1 to 10 (all samples), the winding length of the toilet roll is 33 m or more and 100 m or less, the winding diameter is 100 mm or more and 134 mm or less, and the winding diameter is general. The size of the toilet roll holder can be rotatably accommodated, and the winding length is long, which saves space when the roll is carried and stored.

In Samples 1 to 5 according to the examples, the texture (softness) of the outer surface of the toilet paper is good or excellent, the texture (softness) of the inner surface of the toilet paper is good, and the outer surface is the inner surface. It was softer than. The difference in texture between the outer and inner surfaces of the toilet paper was small, and the difference between the front and back was good or excellent. The adhesiveness was excellent in both the adhesiveness of the pickup glue and the adhesiveness of the tail seal glue. Further, the basis weight per sheet constituting the 2-ply toilet paper of Samples 1 to 5 is 13 g / m ² or more and 16 g / m ² or less, which is large enough to secure appropriate strength and water absorption. there were.

On the other hand, Samples 6 to 10 according to the comparative example have good or excellent texture (softness) on the outer surface of the toilet paper and texture (softness) on the inner surface of the toilet paper, and are different from the outer surface of the toilet paper. The difference in the texture of the inner surface (difference between the front and back) was small and excellent. However, the texture (softness) of the inner surface was equal to or superior to the texture (softness) of the outer surface. On the other hand, the adhesiveness of the pickup glue and the adhesiveness of the tail seal glue were all acceptable in Samples 6 to 10, and the adhesiveness of Comparative Examples was inferior to that of Examples.

10 Toilet roll 11, 12 Sheet 11R, 12R Original roll 13 Toilet paper 14 Paper tube 15 End part 20 Tissue softness measuring device TSA
21 Sample stand 23 Sample 24 Sample fixing ring 25 Rotor with blade 25a Blade 25b Motor 70 Original roll stand 71,72 Embossed roll unit 73,74 Guide roller 75 Embossed roll unit for joining 76 Embossed part 77 Winding part 78 End treatment Part 80 Gluing equipment 81 Mandrel shaft 82 Coater 83 Pickup glue 84 Pickup glue coating part 85 Sending roller 86 Roll 87 Coater 88 Tail seal glue coating part DR Toilet roll winding diameter DC Paper tube diameter P1 TS7 value peak P2 TS750 value peak

Claims (5)

A 2-ply toilet paper with two sheets stacked on top of each other is a toilet roll that is rolled up around a paper tube.
The winding length of the toilet roll is 33 m or more and 100 m or less, and the winding diameter is 100 mm or more and 134 mm or less.
The basis weight per sheet is 13 g / m ² or more and 16 g / m ² or less.
A rotor with a blade is pushed in from above with a pushing pressure of 100 mN for the toilet paper sample installed on the sample table with the outer surface of the toilet roll facing up by the tissue softness measuring device TSA, and then rotated. The outer surface of TS7, which is the intensity of the maximum peak of the spectrum including the frequency of 6500 Hz (TS7 value), which is acquired when the sample table is rotated at several 2.0 seconds and the vibration of the sample table is measured by the vibration sensor, is 13 dBV ² rms or more. 20 dBV ² rms or less,
With the tissue softness measuring device TSA, the rotor with a blade was pushed from above with a pushing pressure of 100 mN against the sample of the toilet paper installed on the sample table with the surface inside the roll of the toilet roll facing upward. The inner surface of TS7, which is the intensity of the maximum peak of the spectrum including the frequency of 6500 Hz (TS7 value), which is acquired when the sample table is later rotated at a rotation speed of 2.0 seconds and the vibration of the sample table is measured by the vibration sensor, is the TS7 . A toilet roll that is larger than the outer surface and is characterized by having a size of 30 dBV ² rms or more and 40 dBV ² rms or less. The toilet roll according to claim 1, wherein the toilet paper is composed of two sheets having different paper qualities. The toilet paper has double embossing in which embossing with different embossing conditions is formed on the entire surface of the two sheets, and the two sheets have embossed recesses in the toilet. The toilet roll according to claim 1 or 2, wherein the toilet rolls are overlapped so as to be located on both sides of the paper. The toilet roll according to claim 1 or 2, wherein the toilet paper is single-embossed over the entire surface of the paper and is wound so that the embossed recess is on the outside of the roll. The toilet roll according to any one of claims 1 to 4, wherein the ratio R (TS7 inner surface / TS7 outer surface) between the inner surface of the TS7 and the outer surface of the TS7 is 1.80 or more and 2.20 or less. ..

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