JP2002238799A - Sanitary tissue paper and article housing this sanitary tissue paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a fluffy feel to tissue paper of a soft type. SOLUTION: This tissue paper is 15 to 25% in tensile break strength in a longitudinal direction, is >=32 N/m in tensile strength in a transverse direction in drying, and is <=3.0 in the aspect ratio of the tensile strength (the tensile strength in the longitudinal direction/the tensile strength in the transverse direction) in drying.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft and soft sanitary thin paper, and more particularly, to tissue paper or toilet paper.

[0002]

2. Description of the Related Art Conventionally, in sanitary thin papers such as tissue paper and toilet paper, soft and soft types of sanitary thin papers (hereinafter referred to as soft or soft types) have been improved in texture such as softness and touch. These are collectively referred to as soft type products) are commercially available. The demand for this soft type product is increasing.

[0003]

However, with the recent changes in the lifestyle, the one that gives a more luxurious feeling and has a soft feeling and a good touch, more specifically, for example, while having a softness, Somewhat bulky textures are being appealed, rather than a bitter feel.

[0004] Conventional soft type products are intended to improve softness and softness by reducing paper thickness, using wood fiber having a thin cell wall as pulp, and adding a softening agent. There is almost no soft texture.

Further, in the conventional soft type product, the composition of the paper strength such as tensile elongation at break is set mainly in consideration of only the tearing and tear prevention properties at the time of pulling out.
Paper strength, paper thickness and texture are all correlated with each other,
It is difficult to improve the softness and to give a soft feeling even if the paper thickness is increased or decreased with the paper strength of the conventional soft type article as it is.

For this reason, conventional soft type products are:
It has not yet been able to achieve a good balance between texture, such as softness, softness, and feel, and paper strength.

On the other hand, as a means for improving the fluffiness, the methods of selectively using a wood fiber having a thin cell wall or using a large amount of a softening agent as described above are all preferable because they increase costs. Absent.

Accordingly, a main object of the present invention is to provide a sanitary thin paper which exhibits a soft feeling and a good touch, for example, while having a softness, not having a thin feeling but a certain bulky texture and giving a sense of quality. In particular, it is to provide tissue paper or toilet paper.

[0009]

Means for Solving the Problems In view of the above problems, the present inventors have conducted intensive studies and found that the tensile elongation at break, the tensile strength and the aspect ratio thereof were set within predetermined ranges, respectively. It has been found that it has the same tear and tear prevention properties as the soft type product, has softness higher than that of the existing soft type product, and can give a fluffy texture.

That is, according to the present invention, the tensile elongation at break in the longitudinal direction is 15 to 25%, the tensile strength in the transverse direction when dried is 32 N / m or more, and A sanitary thin paper characterized in that the aspect ratio of tensile strength (tensile strength in longitudinal direction / tensile strength in lateral direction) is 3.0 or less.

[0011] According to the second aspect of the present invention, the softening agent is used in an amount of 0.1.
The sanitary thin paper according to claim 1, which is contained in an amount of from 1 to 1%.

The invention according to claim 3 is the sanitary thin paper according to claim 2, wherein the softener is a quaternary ammonium salt having 22 to 28 carbon atoms.

According to a fourth aspect of the present invention, the sanitary thin paper comprises one sheet.
The sanitary thin paper according to any one of claims 1 to 3, which is a ply or two-ply tissue paper or toilet paper, and has a crepe ratio of 20 to 30%.

According to a fifth aspect of the present invention, the sanitary thin paper according to any one of the first to fourth aspects is stored in a storage box in a state in which a drawing direction at the time of use and a lateral direction of the paper coincide with each other. This is an article storing sanitary thin paper.

(Effects) The sanitary thin paper of the present invention has a tensile elongation at break of 15 to 2 in the longitudinal direction, with the corrugation extending in the horizontal direction, taking into account the correlation between paper strength and texture.
5%, and the tensile strength at the time of drying in the horizontal direction perpendicular to the longitudinal direction is 32 N / m or more, and the aspect ratio of the tensile strength at the time of drying (the tensile strength in the longitudinal direction / horizontal). Direction tensile strength) was 3.0 or less.

When the tissue paper is stored in the storage box, there is a resistance when the tissue paper is pulled out from the slit of the sheet covering the window of the storage box, so that the paper may be broken. Regarding the relationship between the normal tissue paper and the storage box, the tensile strength in the pull-out direction is extremely large with respect to the tensile strength in the lateral direction (the longitudinal direction of the box), and the ratio is 3.8 or more.
In the present invention, the aspect ratio (tensile strength in the longitudinal direction / tensile strength in the lateral direction) of the tensile strength at the time of drying is set to 3.0 or less, more preferably 2.5 or less. In addition to lowering the tensile strength in the longitudinal direction, the conventional one has a tensile elongation at break of about 10 which is generally about 10 and is extremely large at 15 to 25%, thereby giving a soft feeling. Excessively thin paper eliminates the necessity of giving a soft feeling, and while having the required paper thickness, exhibits a soft feeling and a good hand, resulting in a fluffy texture.

As long as the tensile strength in the horizontal direction at the time of drying is 32 N / m or more, the paper strength in the vertical direction, specifically, the tensile strength in the vertical direction at the time of drying is adjusted so as to be lower than that of the conventional product. However, breakage does not occur at the time of drawing out from the slit.

Incidentally, The tensile strength and the tensile elongation at break in this specification are those when dried, and the measured values are based on JIS.
P 8113 and JIS P 8132.

When the sanitary thin paper is tissue paper, the thickness of the paper is 100 to 150 μm, particularly 10 μm.
When the thickness is 4 to 130 μm, a bulky feeling is given. Conventional products are about 85 μm thick type. Thereby, it has a more fluffy feeling.

The tissue paper may be one sheet (one ply) or two sheets (two plies). Similarly, the toilet paper may be one layer (one ply) or two layers (two ply).

[0021] The sanitary thin paper contains a softener in an amount of 0.01 to
When the content is 1%, the softness and the touch feeling are further improved without lowering the paper strength. As this softener,
A quaternary ammonium salt having 22 to 28 carbon atoms is preferable. Such a softener has a small effect on paper strength and a high effect of improving texture.

The sanitary thin paper of the present invention has high flexibility and high deformability, and also has a large tensile elongation at break in the longitudinal direction, and a difference in tensile strength between the longitudinal and transverse directions when the aspect ratio of the tensile strength is 3.0 or less. Is small. Moreover, the tensile strength in the lateral direction is 32 N / m
That is all. Therefore, even when the sheet is drawn out from the slit in the lateral direction of the sheet, which is opposite to that in the conventional example, there is no occurrence of tearing or tearing at the time of drawing.

[0023]

Embodiments of the present invention will be described in more detail with reference to the drawings. Examples of the sanitary thin paper according to the present invention include tissue paper, toilet paper, and dust paper. Hereinafter, the case where the tissue paper is used will be described.

In the present invention, the longitudinal direction and the lateral direction of the tissue paper are defined as the direction in which the paper is made to flow, that is, the crepe wave extending direction is defined as the horizontal direction, and the direction perpendicular thereto is defined as the vertical direction. In the following embodiment, the case of two sheets (two plies) will be described, but a single sheet (one ply) is also possible. As the number of sheets to be stacked, 200 sets of two sheets (two plies) are preferable, and a total of 400 sheets is preferable.
The following description is based on this case.

The tissue paper according to the present embodiment is
The tensile elongation at break in the longitudinal direction based on JIS P 8113 is 15 to 25%, and the tensile strength in the transverse direction based on JIS P 8113 is 32 N / m or more (preferably 0.37 N
/ M or more) to have sufficient strength,
In use, for example, it is possible to prevent the tissue paper from being broken when wiping.

Further, the aspect ratio of the tensile strength of the tissue paper is 3.0 or less. Increasing the tensile strength in the longitudinal direction during drying increases the strength but reduces the flexibility. When the tensile strength in the longitudinal direction is reduced, the flexibility is improved but the strength is inferior. Conventionally, the ratio was more than 3.0 times, but in accordance with the present invention, the tensile strength in the vertical direction during drying was suppressed, and instead, the tensile strength in the horizontal direction during drying was reduced. By adjusting so as to increase, it is possible to obtain a material having good touch, a soft touch, and sufficient strength.

The paper thickness of the tissue paper according to the embodiment of the present invention is 100 to 150 μm, especially 105 to 145.
μm is desirable. With such a paper thickness, a tissue paper having a very soft feeling is obtained.

The sanitary thin paper of the present invention described in detail above can be produced by a conventional method, but preferably comprises 100% pulp. In this case, the ratio of NBKP: LBKP is 10:90 to 70:30, preferably 35: 6.
5 to 50:50, particularly preferably 40:60 to 45: 5
5

After wet papermaking, creping is performed. The outline of the creping process is shown in FIG. FIG. 2 is an enlarged perspective view of part A. In the figure, D is a wire dryer, R is a take-up reel, and T is tissue paper base paper before cutting. Crepe processing of tissue paper according to the present embodiment,
It is desirable that the elongation of the tissue paper be 15 to 25%, preferably 7 to 13%.
Further, the number of crepes is 35 to 60 / cm, especially 45 to 5
It is preferable to carry out the treatment so as to be 2 lines / cm. For this purpose, the crepe rate according to the formula 1 is set to be 20 to 30%, particularly 2
It is desirable to set it to 2 to 27%.

[0030]

(Equation 1)

On the other hand, the sanitary thin paper of the present invention may contain 0.01 to 1% of a known softener. As the softener, for example, a conventionally known softener containing a surfactant and a polyhydric alcohol, a solvent for dissolving them, and a secondary additive (a small component) is contained.

Specific examples of the surfactant include a carboxylate anion surfactant, a sulfonate anion surfactant, a sulfate ester anion surfactant, and a phosphate ester anion. Anionic surfactants such as surfactants (especially alkyl phosphate ester salts); sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate,
Polyhydric alcohol monofatty acid esters such as propylene glycol monostearate, N- (3-oleyloxy-2)
-Hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbit beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene sorbitan sesquistearate, polyoxyethylene glyceryl monooleate, Nonionic surfactants such as polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether; quaternary ammonium salts, amine salts or Cationic surfactants such as amines; aliphatic derivatives of secondary or tertiary amines containing carboxy, sulfonate, sulfate, or heterocyclic secondary or tertiary amines Emissions, such as aliphatic derivatives of zwitterionic surfactants; etc. can be used. Among them, a surfactant which is a quaternary ammonium salt having 22 to 28 carbon atoms is particularly preferable.

Specific examples of the polyhydric alcohols include:
Glycerin or propylene glycol or a mixture thereof can be mentioned, and glycerin is particularly preferable.

Specific examples of the secondary additives include sugars such as sorbitol or glucose or a mixture thereof, fragrances, coloring agents, preservatives, antioxidants and the like.

The method for adding the softener is not limited. The addition method may be appropriately determined based on a conventionally known technique. As an example of a method for adding a softener, a softener may be applied by printing after papermaking, or may be impregnated by spraying with a spray. Further, a softener may be added to the pulp slurry.

(Storing Form) Next, the storing form of the tissue paper according to the present embodiment will be described in detail. As shown in FIG. 3, when taking out the tissue paper 3 from the storage box 1, the tissue paper 3 is pulled up with the knob 3 </ b> T at the center near the side edge of the tissue paper 3. At this time, the lateral ends of the tissue paper gradually gather at both ends 2a and 2b of the slit 2A as the tissue paper is pulled up. Since the collected tissue paper 3 is pulled up while being caught on both ends 2a and 2b of the slit 2A, the tissue paper that is currently being pulled up is
Tensile forces F act intensively on the portion connecting the knob 3T and both ends 2a and 2b of the slit 2A. In particular, in the latter half of the take-out operation, a force for pulling up the subsequent tissue paper by folding is also required, and the corresponding tensile force is added. Supplementary explanation of the tensile force F acting on the tissue paper is as follows.
(A force for collecting the lateral ends of the tissue paper at both ends 2a and 2b of the slit 2A: a force for separating the tissue paper against a frictional force with a subsequent tissue paper is also included) + Y (both ends of the tissue paper 3 and the slit 2A) 2a, 2b), and in the latter half, almost X
Z (the force for pulling up the subsequent tissue paper by folding) is also added to + Y. In a soft tissue paper, the pulling force F connecting the knob 3T and both ends 2a and 2b of the slit 2A acts as a breaking force in the drawing direction of the tissue paper 3. Therefore, in the conventional soft type product, when the paper is stored so that the paper is pulled out in the horizontal direction with a low tensile strength, breakage occurs at the time of paper drawing, but in the tissue paper 3 according to the embodiment of the present invention, the paper drawing direction is Even if the paper is stored in the horizontal direction, no break occurs. It is desirable to set the drawing direction to the horizontal direction because manufacturing becomes easy.

<Experimental Example> An experimental example of the present invention is shown below.
Table 1 shows the results of evaluation of softness and fluffiness of Examples and Comparative Examples of the present invention.

[0038]

[Table 1]

[Softness] The evaluation of softness in the table is the average of the values of the feelings of the examples and comparative examples evaluated by 30 subjects out of 5 points.

[Fluffy Feeling] The fluffy feelings in the table were evaluated based on the feelings of the examples and comparative examples.
It is the average of the values evaluated on a perfect score.

According to Table 1, Examples 1 and 2 of the present invention
A high evaluation was obtained in the texture test for softness and fluffiness.

[0042]

As described in detail above, according to the present invention, a soft feeling and a good touch are exhibited. For example, while being soft, it has a somewhat bulky texture, not a thin feeling, and gives a sense of quality. Sanitary tissue paper, especially tissue paper or toilet paper, is provided.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a creping process according to the present invention.

FIG. 2 is an enlarged perspective view of a portion A.

FIG. 3 is a diagram for explaining a tissue paper storage mode according to the present invention.

[Explanation of symbols]

1 ... storage box, 1A ... window, 2 ... sheet, 2A ... slit,
3: Sanitary thin paper, L: Effective length of slit, D:
Wire dryer, R ... Rewind reel, T ...
Tissue paper base paper.

Claims (5)

[Claims] (1) a tensile elongation at break in the longitudinal direction is 15 to 25%, a tensile strength in a horizontal direction when dried is 32 N / m or more, and an aspect ratio of the tensile strength in a dry state ( Hygienic thin paper characterized in that tensile strength in the longitudinal direction / tensile strength in the horizontal direction) is 3.0 or less. 2. The sanitary thin paper according to claim 1, wherein the softener is contained in an amount of 0.01 to 1%. 3. The sanitary thin paper according to claim 2, wherein the softener is a quaternary ammonium salt having 22 to 28 carbon atoms. 4. The sanitary thin paper according to claim 1, wherein the sanitary thin paper is one-ply or two-ply tissue paper or toilet paper, and has a crepe ratio of 20 to 30%. 5. The paper sheet according to any one of claims 1 to 4, wherein the paper sheet is stored in a storage box in a state where the drawing direction at the time of use coincides with the lateral direction of the paper sheet. Goods containing sanitary thin paper to be used.