JP2021053249A5 - - Google Patents

Description

The present invention relates to toilet rolls.

As toilet rolls, various products with different factors such as the number of plies, presence/absence of embossing, basis weight, paper thickness, roll length, and roll density are commercially available.

One of them is a product group that is considered to be a long rolled product. In other words, the grammage per ply is not so low, the winding length is increased even though there are two plies, and double embossing is formed to give a soft feeling. An example of this is disclosed in Patent Document 1.

JP 2014-188342 A

However, in this type of long roll product, the sheet tends to be thin and hard. If the sheet becomes hard, it not only impairs the necessary properties such as softness, but also becomes easily broken.

Therefore, the main object of the present invention is to provide a toilet roll that is long and has a satisfactory softness and is less likely to break.

In order to solve the above problems, the present invention is a product in which two plies of sanitary thin paper are wound in a stacked state,
The basis weight per ply is 10.0 to 15.0 g/m ² , the paper thickness per ply is 60 to 95 μm, the outer diameter of the paper tube is 20 to 45 mm, and the winding length for 2 plies is 60 to 90 m. can be,
Furthermore, the tensile modulus of elasticity in one ply is 6.0 to 16.0 N/mm ² and the work at break is 3.0 to 6.0 N·mm,
embossed,
It is a toilet roll characterized by
Here, the tensile modulus and the work at break are measured values in the longitudinal direction of the fiber, and were measured on a sample of 25 mm width with the distance between the gripping jigs in the tensile tester set at 50 mm and the tensile speed at 10 mm/min. value.

ADVANTAGE OF THE INVENTION According to this invention, the toilet roll which satisfies the softness|softness, and is hard to break can be provided, although it is a long winding article.

FIG. 10 is a diagram showing a tensile test result in Comparative Example 1; 1 is a drawing showing the results of a tensile test in Example 1. FIG. 1 is a schematic perspective view of a toilet roll; FIG. FIG. 4 is a plan view of an example embossing configuration; FIG. 5 is a cross-sectional view of a main part taken along line in FIG. 4;

Hereinafter, the present invention will be described more specifically while describing embodiments of the present invention.

As illustrated in FIG. 3, the toilet roll according to the present invention is a toilet roll 1 obtained by winding strip-shaped toilet paper 10 around a paper tube (also called tube core) 20 in a roll shape.

This toilet paper can contain 100% by mass of virgin pulp as a fiber material, and can also contain waste paper pulp.
For example, 30 to 70% by mass of virgin pulp and 30 to 70% by mass of waste paper pulp can be used as the fiber material. Waste paper pulp is less expensive than virgin pulp, and by blending waste paper pulp, it is possible to manufacture at a lower cost than one made of 100% by mass of virgin pulp.

Waste paper pulp is not necessarily limited, but it is particularly desirable to use high-quality waste paper pulp (also called F-DIP, high-quality waste paper pulp, or high-quality deinked pulp) made from high-quality waste paper. High-quality waste paper pulp is made from selected high-quality waste paper such as high-quality paper, colored high-quality paper, and slightly glossy paper, and contains a large amount of hardwood kraft pulp (LBKP) derived from the raw material. For this reason, it is easy to develop paper strength, and in particular, it becomes extremely easy to configure the basis weight, paper thickness, dry tensile strength, winding diameter, and winding density of the toilet paper.

The toilet paper according to the present invention has the composition of the fibrous material and the basis weight (basis weight per ply) of 10.0 to 15.0 g/m ² , particularly 11.0 to 14.0 g/m ^{2 .} It is desirable to First, when the basis weight is small, it becomes difficult to obtain the required strength and paper thickness. On the other hand, if the grammage is excessively large, the thickness of the paper increases, making it difficult to achieve a desired compact winding diameter range.
The basis weight is a value measured based on JIS P 8124 (1998).

The paper thickness per ply is 60 to 95 μm, preferably 70 to 90 μm. If the thickness of the paper is thin, it is difficult to secure the necessary strength, and the stiffness of the paper is lost, resulting in poor texture, especially softness. Furthermore, it becomes difficult to obtain a suitable winding diameter and winding hardness as a product. Conversely, if the thickness of the paper is large, it becomes difficult to obtain a desired roll diameter, making it difficult to achieve compactness.

The method of measuring the paper thickness is as follows: After sufficiently conditioning the test piece under the conditions of JIS P 8111 (1998) (usually about 8 hours), a dial thickness gauge (thickness measuring instrument) "PEACOCK G Mold" (manufactured by OZAKI MFG. CO., LTD.) shall be used for measurement in the state of 1 ply. Specifically, after confirming that there is no dust or dust between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to adjust the zero point, and then Raise the plunger to place the sample on the test table, slowly lower the plunger and read the gauge at that time. At this time, only the plunger is placed. The terminal of the plunger is made of metal, and a circular plane with a diameter of 10 mm is made to hit the paper plane perpendicularly. In addition, let paper thickness be the average value obtained by performing a measurement 10 times. Moreover, the dry tensile strength according to the present invention is specified in JIS P 8113.

The outer diameter of the paper tube is preferably 20-45 mm, particularly 35-45 mmφ. The outer diameter of the paper tube basically does not relate to the characteristics of the toilet paper, but is defined in terms of the winding length and winding density of the two-ply roll.

The winding length of 2 plies is set to 60 to 90 m, preferably 65 to 85 m.

The toilet paper in the embodiment is made of virgin pulp and waste paper pulp that is blended as necessary, and the basis weight, paper thickness, paper tube outer diameter, and winding length of 2 plies. Although it is short, it can easily fit in a commercially available toilet roll holder, and can be easily removed from the holder.
The "fitting" and "ejectability" are evaluated as "ease of hooking" and "ease of turning" in test results described later.

The toilet paper of the present invention has a one-ply tensile modulus of elasticity of 6.0 to 16.0 N/mm ² , more preferably 6.5 to 10.0 N/mm ² , and a work to break of 3.0 to 6.0 N. · mm, more preferably 3.5 to 5.5 N·mm, the paper has satisfactory softness and is hard to break.
Here, the tensile modulus and the work at break are measured values in the longitudinal direction of the fiber, and were measured on a sample of 25 mm width with the distance between the gripping jigs in the tensile tester set at 50 mm and the tensile speed at 10 mm/min. value.

In addition, it is more desirable that the elongation at break is 6.0 to 12.0%.

As long commercial products, there are long products with similar values of basis weight and paper thickness. However, the tensile modulus and work at break values of this commercial product show different values.

Typically, the tensile test results for Comparative Example 1 are shown in FIG. 1, while the tensile test results for Example 1 are shown in FIG.

A supplementary description of this test will be given.
That is, when the user gently touches the toilet paper sheet, if the sheet is stretched, the stress from the sheet is small, and the user feels that the sheet is soft.
In this way, assuming "when the sheet is gently touched", the tensile speed of the gripping jig in the tensile tester is set to 10 mm/min, and the value of the tensile elastic modulus at 0 displacement is obtained to determine the quality of the sheet. is ideal for Displacement 0 means that a sample with a width of 25 mm was used according to JIS P 8113, and the point at which the elongation (stroke) was set to 0 when the load was 0.2 N was defined as 0 displacement.
Tensile strength is usually measured at a tensile speed of 100 mm/min, and Comparative Example 1 has a higher elongation at break. This is because the breaking strength of the sheet is high, and the sheet (paper quality) is hard and different from the elongation percentage of the soft sheet shown in Example 1, as shown in FIG.

Also, the work to break at a tensile speed of 10 mm/min is higher in Example 1 than in Comparative Example 1, and it can be said that it is difficult to break by elongation.

A sheet having a tensile elastic modulus of 6.0 to 16.0 N/mm ² and a work to break of 3.0 to 6.0 N·mm in one ply can be said to be a paper that satisfies softness and is difficult to break. .
In fact, the evaluation based on the values of tensile modulus and work at break is highly compatible with the sensory evaluation, as will be shown in the later-described test evaluation.

As a means of obtaining a toilet roll that is long but has sufficient softness and does not easily break, for example, the elongation of the crepe can be maintained even after processing by the ironing effect of the crepe shape by calendering in a ply machine. For example, it is possible to operate as shown in the figure, and to devise embossing.

Regarding the embossing, furthermore, by partially destroying the fibers against the entire flow by the ridgeline of the embossing, it becomes easy to stretch and shrink under a small load (this is tentatively called "Mt. Fuji embossing"), Further, the embossing may include double embossing.
When double embossing is used, there are gaps between the sheets, and both the front and back sides are smooth, resulting in a soft and smooth quality. On the other hand, with single embossing, which is widely used for long products, it is difficult to obtain sufficient softness, as shown in the test examples described later.

The winding density of the toilet roll in the embodiment is desirably 1.0 to 1.8, particularly 1.2 to 1.7. When the winding density is low, the texture can be maintained because the winding is loose, but the winding length is short compared to the winding diameter of the roll, resulting in excessive distribution costs. On the contrary, when the winding density is high, the texture is significantly deteriorated. The winding density is calculated as described later.

On the other hand, the toilet paper according to the present invention may contain a softening agent to adjust paper strength and improve surface properties. However, the softening agent here is not applied externally to the toilet paper like a moisturizing agent or a lotion, but is internally added to the papermaking raw material. In the case of a lotion that is externally applied, the reduction in paper strength at the time of application makes it difficult to wind up with a high tension for compactness, making the production extremely difficult. Moreover, it is difficult to achieve a desired winding density, and it is also difficult to reduce the cost. The blending amount of the softener is preferably 0.8 to 2.0 kg/t. Preferred softeners are those containing a nonionic surfactant (component A) having an alkyl group and/or alkenyl group and a cationic surfactant (component B) having an alkyl group and/or alkenyl group. be. In particular, the nonionic surfactant (component A) preferably has a C6-24 alkyl group and/or a C6-24 alkenyl group as a hydrophobic part. If the number of carbon atoms in the A component is less than 6, the softening effect may not be enhanced.

Further, in the production of the toilet paper according to the present invention, the fibrous raw material can be appropriately beaten, but in the toilet paper according to the present invention, the beating operation can be omitted by blending waste paper pulp. be.

Also, the crepe ratio during papermaking can be set as appropriate. The crepe rate is preferably 15-27%, more preferably 18-23%. When processing into a roll, the winding diameter may be adjusted by drawing or tension. This is preferable because it does not make the paper excessively thick.

Furthermore, it is desirable that the toilet paper be embossed. This embossing can be an appropriate embossing pattern such as micro-embossing, dot-shaped embossing, or design embossing. However, when embossing is applied, the depth of the embossed pattern is preferably 1.90 mm or less. More preferably, it should be within the range of 0.7 mm to 1.90 mm. If it is deeper than 1.90 mm, it will be difficult to make it compact. Also, if the embossing depth is less than 0.75 mm, the embossing tends to result in insufficient bulkiness and design.
The dimensions related to embossing are the actual dimensions of the protrusions formed on the embossing (metal) roll, and do not relate to the embossing actually applied to the paper because the embossing roll is an elastic roll made of rubber or the like. .
As a preferable example of embossing, like the above-mentioned "Mt. Fuji embossing", each recess having a square bottom surface is continuous from each vertex of the positive direction bottom surface to the vertex of the square bottom surface of the adjacent recess by a valley line. are arranged so as to be connected to This embossing tends to produce the desired effect of obtaining a soft and smooth quality sheet.

A specific example of the aforementioned "Mt. Fuji emboss" is shown.
As shown in FIGS. 4 and 5, the "Mt.Fuji emboss" is such that concave portions 40, 40 with square bottoms are arranged in a lattice pattern over the entire paper surface with a predetermined center interval L9, and the four corners of the bottom surface are connected. valley grooves 41, 41 . . .
The "Mt. Fuji emboss" is particularly a square with a bottom surface of 1.0 to 1.5 x 1.0 to 1.5 mm, a center interval L9 of 4.5 to 5.5 mm, and the concave portions 50, 50 ... , 40° to 50° with respect to the width direction (the arrangement angle is indicated by ∠B in FIG. 4) in a grid pattern.

In addition, the form of "Mt. Fuji embossing" can be a so-called single embossing form in which the concave part on one side is a convex part on the other side, but it is a so-called double embossing form in which both sides are concave. is desirable.

The toilet roll according to the present invention can be produced by winding the toilet paper base paper obtained in the papermaking process according to a known production procedure. More specifically, a long paper tube is manufactured in a paper tube forming process for manufacturing a long paper tube, and the toilet paper manufactured in the paper making process is wrapped around the long paper tube to manufacture a log, Furthermore, in the manufacturing procedure for making individual toilet rolls by cutting the log in the width direction according to the product width (the width of symbol L3 in FIG . 3 ), particularly when the log is manufactured, when the toilet paper is wrapped around the paper tube can be manufactured by adjusting the tension of

Next, examples and comparative examples of the toilet roll of the present invention will be shown to clarify the effects of the present invention.

The configuration of the toilet roll and the physical properties and composition of the toilet paper according to each example are shown in Table 1 below.

The fiber material is 30% softwood kraft pulp (NBKP) and 70% hardwood kraft pulp (LBKP).

For embossing, the above-mentioned "Mt. Fuji emboss" was applied, and the depth of the embossed pattern was 1.45 mm.
Calendering was done on the paper machine and ply machine.

Evaluation was carried out by asking 20 subjects to actually use the toilet rolls according to each example for one week, and evaluating "softness", "smoothness", "moist feeling", "fluffy feeling", and "hardness to tear". For each item, we decided to perform an absolute evaluation in seven stages.
As a rating, 7 points: very excellent, 6 points: excellent, 5: somewhat excellent, 4 points: neither, 3 points: somewhat poor, 2 points: poor, 1 point: very poor. rice field.

The measurement methods for the measured values in the table are as follows.

[Basis Weight]
It was measured according to JIS P 8124 (1998).

[Paper thickness]
Under the conditions of JIS P 8111 (1998), the thickness was measured using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki Seisakusho) according to the above-described thickness measurement method.

[Roll winding density] = Theoretical cross-sectional area / Roll cross-sectional area Roll cross-sectional area = Cross-sectional area of entire roll - Cross-sectional area of paper tube Theoretical cross-sectional area = Paper thickness x Winding length

[Tensile strength and breaking elongation]
Tensile speed (longitudinal) 100 mm/min, (horizontal) 50 mm/min, sample width 25 mm,
The distance between gripping jigs is 100mm,
Measure strength and elongation at break with 2 plies Measurement tester: Minebea Co., Ltd. "Tensile compression tester TG-200N"

[Tensile modulus (longitudinal)]
Five measurements were made for one ply at a tensile speed of 10 mm/min, a sample width of 25 mm, a distance between gripping jigs of 50 mm, and the average value was taken as the value of the tensile modulus.
Measurement testing machine: "EZS-20NX" manufactured by Shimadzu Corporation
Software: "TRAPEZIUMX"

[Breaking work (longitudinal)]
An integrated value of the load-displacement curve obtained with one ply at a tensile speed of 10 mm/min, a sample width of 25 mm, a distance between gripping jigs of 50 mm.
Measurement testing machine: "EZS-20NX" manufactured by Shimadzu Corporation
Software: "TRAPEZIUMX"

In Table 2 there is an example called "Reference Example". It is so named because it is not rated high enough, even if it is within the defined scope of the present invention.

From these comparative examples and examples, it can be said that by adopting the configuration of the present invention, it is possible to obtain a toilet roll that is long and has satisfactory softness and that is difficult to break.

1... Toilet roll, 10... Toilet paper, 20... Paper tube (pipe core), L1... Toilet roll winding diameter (diameter), L2... Toilet roll tube core diameter, L3... Toilet roll width.

Claims (3)

2-ply sanitary thin paper is wound in a stacked state,
The basis weight per ply is 10.0 to 15.0 g/m ² , the paper thickness per ply is 60 to 95 μm, the outer diameter of the paper tube is 20 to 45 mm, and the winding length for 2 plies is 60 to 90 m. can be,
Furthermore, the tensile modulus of elasticity in one ply is 6.0 to 16.0 N/mm ² and the work at break is 3.0 to 6.0 N·mm,
embossed,
A toilet roll characterized by:
Here, the tensile modulus and the work at break are measured values in the longitudinal direction of the fiber, and were measured on a sample of 25 mm width with the distance between the gripping jigs in the tensile tester set at 50 mm and the tensile speed at 10 mm/min. value. 2. The toilet roll according to claim 1, wherein each ply is embossed and laminated to form a double embossment. The toilet roll according to claim 1, which has a breaking elongation of 6.0 to 12.0%.