JP2018171254A - Tissue paper and method of manufacturing tissue paper product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide multi-ply tissue paper which is excellent in "softness" and "smoothness" while giving "puffy bulky feeling".SOLUTION: Three-ply tissue paper includes glycerin and 1,3-propanediol of 6.1 mass% or more and 12.6 mass% or less, and a ratio of the glycerin to the 1,3-propanediol is 1:0.07 or more and 1:0.18 or less. A basis weight of each layer is 13.4 g/mor more and 16.0 g/mor less. A paper thickness of an outer layer is 64 μm or more and 76 μm or less, and MMD of the outer layer is 5.0 or more and 6.1 or less. A paper thickness of a middle layer is 49 μm or more and 59 μm or less, and MMD of the middle layer is 5.8 or more and 7.1 or less. A paper thickness of 3-ply paper is 193 μm or more and 227 μm or less. A dry strength in a longitudinal direction is 301 cN/25 mm or more and 414 cN/25 mm or less, and a dry strength in a lateral direction is 89 cN/25 mm or more and 125 cN/25 mm or less. A wet tensile strength in the lateral direction/a dry tensile strength is 0.40 or more and 0.54 or less.SELECTED DRAWING: None

Description

  The present invention relates to tissue paper, and particularly to tissue paper to which a moisturizing agent is applied.

Two-ply tissue paper is the mainstream, but in recent years, the demand for multiply and thick materials such as three-ply and four-ply is increasing.
Such multi-ply tissue paper is often regarded as a product belonging to a high-grade type with a high product price. In particular, tissue paper of such a product group has “soft and bulky” and “smooth surface”. "And" softness "are highly required.

In the case of the multi-ply structure, when the rice basis weight of each ply is increased, the paper thickness can be easily increased by synergy of each ply, and a sense of thickness and bulkiness can be expressed. However, if the ply weight of each ply is increased in this way, softness and smooth quality cannot be obtained.
In addition, when the base paper is manufactured so as to have a low density during paper making, a soft and bulky base paper can be obtained. The bulk may decrease. In addition, when the density of the base paper is reduced, the surface fibers are sparse and the smoothness tends to deteriorate.

JP2013-188921 JP 5472586 A

  An object of the present invention is to provide a multi-ply tissue paper that solves the above-described problems and is excellent in “softness” and “smoothness” while being able to feel “soft and bulky”.

Means for solving the above problems are as follows.
The first means to solve the above problem is
3 ply tissue paper
It contains 6.1% by mass or more and 12.6% by mass or less of glycerin and 1,3-propanediol, and the ratio of glycerin and 1,3-propanediol is 1: 0.07 or more and 1: 0.18 or less. ,
The basis weight of each layer at the time of product is at 13.4 g / m ² or more 16.0 g / m ² or less,
The outer layer has a paper thickness of 64 μm or more and 76 μm or less, and the outer layer has an MMD of 5.0 or more and 6.1 or less,
The paper thickness of the middle layer is 49 μm or more and 59 μm or less, the MMD of the middle layer is 5.8 or more and 7.1 or less,
The paper thickness at 3 plies is 193 μm or more and 227 μm or less,
The dry strength in the vertical direction is 301 cN / 25 mm or more and 414 cN / 25 mm or less,
The transverse dry strength is 89 cN / 25 mm or more and 125 cN / 25 mm or less,
The wet tensile strength in the transverse direction / the dry tensile strength in the transverse direction is 0.40 or more and 0.54 or less,
This tissue paper is characterized by that.

The second means for solving the above problem is:
An outer base paper having a dry paper strength of 182 cN / 25 mm or more and 247 cN / 25 mm or less in the vertical direction and a dry paper strength of 90 cN / 25 mm or more and 129 cN / 25 mm or less in the horizontal direction;
An intermediate base paper having a dry paper strength in the longitudinal direction of 96 cN / 25 mm or more and 153 cN / 25 mm or less, and a dry paper strength in the transverse direction of 49 cN / 25 mm or more and 83 cN / 25 mm or less;
Has a three-layer structure,
The ratio of the longitudinal dry paper strength of the intermediate base paper to the vertical dry paper strength of the outer base paper is more than 0.47 and less than 0.66, and the lateral direction of the intermediate base paper with respect to the lateral dry paper strength of the outer base paper The ratio of the dry paper strength is more than 0.51 and less than 0.67.
For the front and back of the laminated sheet,
A moisturizer containing glycerin and 1,3-propanediol, wherein the mass ratio of glycerin and 1,3-propanediol is 1: 0.07 or more and 1: 0.18 or less. Is given in such a way that it contains 6.1% by mass to 12.6% by mass in absolute terms.
This is a method for producing tissue paper products.

The third means is
A first calendar processing step to be performed before applying the moisturizing liquid,
A second calendar processing step to be performed after applying the moisturizing chemical,
A method of manufacturing tissue paper products according to the second means, comprising: a folding step of folding with a rotary interfolder.

  As described above, according to the present invention, it is possible to provide a multi-ply tissue paper that has a “soft and bulky feeling” and is excellent in “softness” and “smoothness”.

It is a figure for demonstrating the measuring method of MMD. It is a 1st graph which shows the result of the test example which concerns on embodiment. It is a 2nd graph which shows the result of the test example which concerns on embodiment.

Embodiments of the present invention will be described below.
[Tissue paper]
The tissue paper according to the present embodiment is a three-ply tissue paper. In other words, it is a tissue paper in which three sheets are stacked.
The three-ply tissue paper according to this embodiment contains glycerin and 1,3-propanediol in an amount of 6.1% by mass to 12.6% by mass, and the ratio of the glycerin to 1,3-propanediol is 1: 0.07 or more and 1: 0.18 or less.

  The content of glycerin and 1,3-propanediol is a ratio in paper, which is a ratio of the mass of glycerin and 1.3-propanediol to the mass of tissue paper when completely dried. In addition, the time of absolutely dry is the state dried to a constant weight at a temperature of 65 ° C. and a humidity of 10%. The ratio of glycerin and 1,3-propanediol is a mass ratio.

  The tissue paper may contain known auxiliaries other than glycerin and 1,3-propanediol. Examples of auxiliaries include moisturizing auxiliary components such as sorbitol, hydrophilic polymer gelling agents, surfactants and flexibility improvers to enhance moisture retention in tissue paper, and assist in the expression of smoothness. Other examples include oily components such as liquid paraffin, emulsifiers, antiseptics, antifoaming agents, etc. for improving the stability and stability of the moisturizing agent. In addition, the amount of ingredients such as moisturizing auxiliary ingredients and hydrophilic polymer gelling agents that enhance moisture retention has an excessive effect on "soft bulkiness", "softness" and "surface smoothness". To the extent that does not affect Specifically, it is 1.0% by mass or less, preferably 0.6% by mass or less, and more preferably 0.5% by mass or less.

Here, although the tissue paper which concerns on this embodiment contains glycerol and 1, 3- propanediol, the chemical | medical solution generally conventionally used for tissue paper makes only glycerol the main effect ingredient. Due to the moisture absorption effect of glycerin, the moisture content in the paper is increased to increase moistness and softness. However, since the conventional glycerin-only product relies only on the moisture absorption effect, it also has a high level of drug application such as “wetness”, “wetness”, and “stickiness”, resulting in “smoothness” and “softness”. There are things that are difficult to do. The 1,3-propanediol according to the present embodiment increases the “softness” by its blending, but the surface has a smooth feel. Therefore, the tissue paper of this embodiment can enhance “softness”, “soft bulkiness”, and “surface smoothness” by the effect of glycerin and the effect of 1,3-propanediol. .
And the effect which concerns is the composition of 3 ply layer structure, basic weight, paper thickness, MMD, and paper strength, the content rate of said glycerol and 1, 3- propanediol, and glycerol and 1, 3- propanediol. The effect becomes remarkable in combination with the mass ratio.

Its basis weight of each layer of tissue paper of the present embodiment is 13.4 g / m ² or more 16.0 g / m ² or less. When the basis weight of each layer is within this range, “softness”, “soft bulkiness”, and “surface smoothness” become remarkable. In particular, when the basis weight is high, paper tends to be hard, and when the basis weight is low, the basis weight tends to be soft. The basis weight is a value measured based on JIS P 8124 (1998).

  In the tissue paper of this embodiment, the outer layer has a paper thickness of 64 μm or more and 76 μm or less, and the outer layer has an MMD of 5.0 or more and 6.1 or less. In addition, an outer layer means each layer located in both the outer surfaces of a 3 layer structure. However, each outer layer does not necessarily have the same configuration. When the paper thickness and MMD of the outer layer are within this range, “softness”, “soft bulkiness”, and “surface smoothness” become remarkable. The outer surface of the outer layer constitutes a surface that directly touches the skin.

  A chemical solution is applied to the outer surface of the outer layer, and the chemical solution penetrates from the outer surface to the inside. Therefore, the effects of “softness” and “smoothness of the surface” are achieved by the moisturizing effect of the chemical solution and the smooth physical properties of the chemical solution. In addition, since the outer layer contains a chemical solution, the paper is smoothed by the external pressure applied to the outer surface of the outer layer, such as calendering, and the chemical solution applied to the surface becomes uniform and the surface becomes smoother. Is expressed.

MMD is an index representing the smoothness of the surface, and if it is within this range, a sufficient “smoothness” is felt. However, the smoothness of the surface measured by MMD has a considerable influence on the density of the fibers. The density of the fibers is also related to the density of the paper, that is, the paper thickness and the basis weight. On the other hand, the density of paper affects "softness" and "softness". That is, in the outer layer, in addition to the basis weight, the MMD and the paper thickness are in a predetermined range, so that the mechanical configuration and the configuration of the drug such as glycerin have a complicated influence, and “softness” and “ It is considered that “soft and bulky feeling” and “smoothness of the surface” become remarkable.

  On the other hand, in the tissue paper of the present embodiment, the thickness of the middle layer is 49 μm or more and 59 μm or less, and the MMD of the middle layer is 5.8 or more and 7.1 or less. When the paper thickness and MMD of the middle layer are within this range, “softness”, “soft bulkiness”, and “surface smoothness” become remarkable. The middle layer does not constitute a surface that directly touches the skin, but as described above, the smoothness of the surface measured by the MMD has a considerable influence on the density of the fibers, and the density of the fibers depends on the density of the paper, that is, the paper thickness. Also related to basis weight. In addition, the surface property of the middle layer also affects the rubbing and integrity with the outer layer. Therefore, MMD, basis weight and paper thickness are related to “soft feeling” and “softness”. In the middle layer, in addition to the basis weight, the MMD and the paper thickness are in a predetermined range, so that the mechanical configuration and the configuration of the drug such as glycerin have a complex influence, and “soft” and “soft It is thought that “a sense of bulkiness” and “smoothness of the surface” become remarkable.

  In particular, the tissue paper of this embodiment has a thin middle layer compared to the outer layer. The middle layer tends to have a lower chemical content than the outer layer. In some cases, no chemical is contained. For this reason, the middle layer is less affected by the moisturizing effect of the chemical solution, and is less crushed in the thickness direction due to external pressure such as calendaring. For example, the density of the middle-layer base paper can be kept low even after two calendar processes in forming a three-layer laminated structure. For this reason, the effect of a soft and bulky feeling is expressed. And it is thought that the effect of functionality is remarkably enhanced by the difference in paper thickness between the outer layer and the middle layer, the density difference due to the difference in paper thickness, and the difference in moisture content due to the density difference.

  The paper thicknesses of the outer layer and the middle layer were adjusted to the thickness of the test piece under the conditions of JIS P 8111 (1998) and then dial thickness gauge (thickness measuring instrument) “PEACOCK G type” (Ozaki Manufacturing Co., Ltd.). The value measured using Specifically, confirm that there is no dust, dust, etc. 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 Then, raise the plunger, place the test piece on the measuring table, slowly lower the plunger and read the gauge at that time. At the time of measurement, care is taken that the terminal of the metal plunger (a circular plane having a diameter of 10 mm) is perpendicular to the paper plane. The load at the time of measuring the paper thickness is about 70 gf. The paper thickness is an average value of the measurement values obtained by performing this measurement 10 times while changing the part. Test specimens are collected by peeling 3 plies from each layer.

  MMD (variation of the average friction coefficient) is a value indicating the degree of variation of how much variation is from the average friction coefficient, and is also an index of smoothness. The smaller the value, the smoother. The measurement is performed using a friction feeling tester KES-SE manufactured by Kato Tech Co., Ltd. or an equivalent machine. As shown in FIG. 1, the measurement method was applied with tension while bringing the contact surface of the friction element into contact with the surface of the measurement sample to which tension of 20 g / cm was applied in a predetermined direction at a contact pressure of 25 g. This is performed by moving 2 cm at a speed of 0.1 cm / s in substantially the same direction as the direction. The value obtained by dividing the friction coefficient by the friction distance (movement distance = 2 cm) is MMD. The friction element is a standard 10 mm square piano wire sensor. This friction element is formed by adjoining 20 piano wires P having a diameter of 0.5 mm, and has a contact surface formed so that the length and width are both 10 mm. The contact surface is formed with a unit bulging portion whose tip is formed of 20 piano wires P (curvature radius 0.25 mm). MMD is measured 10 times for each surface, and the average value is taken. The test piece is collected by peeling off 3 plies from each layer in the same manner as the paper thickness. The outer layer MMD measures the outer surface of the three-ply layer that directly touches the skin. The measurement is performed 10 times in total, 5 times each in the vertical direction and the horizontal direction, and the average value of the measured values is defined as MMD. The MMD of the middle layer is the average value of the front and back. The measurement is performed 5 times each in the vertical and horizontal directions on the front and back sides, a total of 20 times, and the average value is defined as MMD.

  On the other hand, the tissue paper of the present embodiment has a paper thickness of 193 μm or more and 227 μm or less at 3 plies. In a multi-ply structure such as 3-ply, the paper thickness tends to affect particularly “softness” and “softness”. In the tissue paper of this embodiment, when the paper thickness is within this range, “softness”, “soft bulkiness”, and “surface smoothness” become remarkable.

  On the other hand, the tissue paper of the present embodiment has a dry strength in the vertical direction of 301 cN / 25 mm or more and 414 cN / 25 mm or less. When the dry strength in the vertical direction is within this range, “softness”, “soft bulkiness”, and “surface smoothness” become prominent. Moreover, it exists in the range of sufficient intensity | strength which can be used.

  Further, the dry strength in the lateral direction is 89 cN / 25 mm or more and 125 cN / 25 mm or less. If the dry strength in the lateral direction is within this range, “softness”, “soft bulkiness” and “surface smoothness” become remarkable. Moreover, it exists in the range of sufficient intensity | strength which can be used. Furthermore, although it is not certain, the “lateral dry tensile strength” has an effect on the overall “feel of the skin” rather than individual functionality such as “soft” and “soft”. Evaluate the quality of tissue paper based on the overall evaluation criteria of “feel” after touching the sample freely, rather than specific evaluation criteria such as “softness” and “soft feeling” It is known that there is a certain correlation between the evaluation of the “texture” and the “lateral drying strength”.

The tissue paper of this embodiment has a wet tensile strength in the transverse direction / dry tensile strength in the transverse direction of 0.40 or more and 0.54 or less. In addition, this value is a measured value with 3 plies. Due to such a difference in strength, the user comes to feel “sturdiness (strength / reassurance)” in a usage mode that changes from dry to wet when biting a heel. Further, it is difficult to feel the change in the strength of the paper in such a usage mode, which affects how “smoothness” is felt during use.
The longitudinal direction of the paper is also called the MD direction, and is the flow direction during paper making. The lateral direction of the paper is also called a CD direction, and is a direction orthogonal to the flow direction (MD direction) during papermaking.

  Moreover, the dry tensile strength of the tissue paper according to the present invention is a value measured based on JIS P 8113, and is a value measured as follows. The test piece is cut into a width of 25 mm (± 0.5 mm) and a length of about 150 mm in both the vertical and horizontal directions. Tissue paper is measured with multiple plies. As a testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. and an equivalent machine corresponding thereto are used. The gripping interval is set to 100 mm and the pulling speed is set to 100 mm / min. The measurement is performed by tightening both ends of the test piece to the grip of the testing machine, applying a tensile load in the vertical direction, and reading the indicated value (digital value) when the paper breaks. Five sets of samples are prepared for each of the machine direction and the machine direction, measured 5 times each, and the average of the measured values is defined as the dry tensile strength in each direction.

  Moreover, the wet tensile strength of the tissue paper according to the present invention is a value measured based on JIS P 8135 (1998), and is a value measured as follows. The test piece is cut into a width of 25 mm (± 0.5 mm) and a length of about 150 mm in both the vertical and horizontal directions. If tissue paper is used for multiple plies, measure with multiple plies. As a testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. and an equivalent machine corresponding thereto are used. The gripping interval is set to 100 mm and the pulling speed is set to 50 mm / min. A test piece that has been cured for 10 minutes in a dryer at 105 ° C. is used. After tightening both ends of the test piece to the grip of the testing machine, using a flat brush soaked in water, water is applied horizontally to the center of the test piece with a width of about 10 mm, and then immediately up and down with respect to the paper piece. Measurement is performed by applying a tensile load to and reading the indicated value (digital value) when the paper breaks. Five sets of samples are prepared for each of the machine direction and the machine direction, and each sample is measured 5 times. The average of the measured values is taken as the wet tensile strength in each direction.

  The dry tensile strength and wet tensile strength can be adjusted by internally adding a dry paper strength enhancer or a wet paper strength enhancer to the stock or wet paper. As the dry paper strength enhancer, starch, polyacrylamide, CMC (carboxymethylcellulose) or a salt thereof such as sodium carboxymethylcellulose, carboxymethylcellulose calcium, carboxymethylcellulose zinc and the like can be used. As the wet paper strength enhancer, polyamide polyamine epichlorohydrin resin, urea resin, acid colloid / melamine resin, thermally crosslinkable coating PAM, and the like can be used. When a dry paper strength enhancer is internally added, the amount added to the pulp slurry is about 1.0 kg / pulp t or less. Further, the wet paper strength enhancer is preferably a cationic one, and the amount added to the pulp slurry is about 5.0 to 20.0 kg / pulp t.

  The fiber material constituting the tissue paper is a pulp fiber, and is desirably NBKP (coniferous kraft pulp) and LBKP (hardwood kraft pulp) used for the tissue paper. Although waste paper pulp may be blended, it is highly desirable that the waste paper pulp is composed only of virgin pulp NBKP and LBKP because it is difficult to express “softness”. As a mixture ratio, it is NBKP: LBKP = 25: 75-40: 60 by mass ratio. Within this range, it is possible to make the “softness” and “smoothness” remarkably felt while feeling the paper strength necessary for glazing and “soft and bulky”.

  On the other hand, in the tissue paper according to the present embodiment, it is desirable that the elongation in the vertical direction is 8.5% or more and 12.4% or less. When the elongation percentage is within this range, sufficient strength and a feeling of use are easily exhibited during use such as when biting. The elongation rate is also related to the surface property of the tissue paper having fine crepes on the surface, and it is easy to develop “smoothness” of the surface. In addition, this elongation rate says the value measured according to the tension test of JISP8113 (1998). Examples of the measuring device include “Universal Tensile Compression Tester TG-200N” manufactured by Minebea Co., Ltd. The elongation rate can be adjusted by the crepe rate at the time of paper making of the tissue paper.

[Method for producing tissue paper]
The tissue paper according to the present embodiment and a product obtained by packaging the tissue paper in a bundle can be manufactured by the following manufacturing procedure. First, a single-layer tissue paper having a crepe made by a paper making facility is wound to form a primary raw roll. Next, three primary raw rolls are set in a laminating facility also called a ply machine, a single-layer continuous sheet is drawn from each primary raw roll and laminated into three layers, and then appropriately slit, etc. Thus, a secondary roll for winding is manufactured. Next, the secondary bundle roll is used to form a laminated bundle in a folding facility or the like also called an interfolder. Next, the laminated bundle is cut into an appropriate size, and then packed in a box to obtain a product related to tissue paper. A series of manufacturing processes for commercializing this tissue paper, or a separate chemical application facility is provided between the processes, and a moisturizing chemical solution containing glycerin and 1,3-propanediol is externally applied to the tissue paper base paper. The moisturizing chemical solution may be applied to the tissue paper base from one side, but it is desirable to apply both sides because it is easy to make the smoothness of both sides uniform. In particular, the application of the moisturizing chemical solution is particularly preferably performed in the state of a laminated continuous sheet in which tissue paper base papers are laminated. Applying to a continuous sheet in a laminated state is desirable in terms of operability because there is little decrease in strength as a whole ply, and a moisturizing liquid can be reliably applied to both outer layers that touch the skin.

  Specifically, the application of the moisturizing chemical solution may be carried out by incorporating a chemical liquid application device such as a flexographic printing machine, a gravure printing machine or other roll transfer device, or a spray coating device in either the ply machine or the interfolder. However, these devices may be provided as separate facilities from the ply machine and the interfolder.

  The moisturizing liquid can be adjusted, for example, to glycerin, 1,3-propanediol and an appropriate auxiliary agent to a viscosity according to the coating method using an appropriate solvent such as water.

  The interfolder that performs the folding process may be a facility that performs the folding process using a folding plate that is also referred to as a multi-stand type, a stand type, or a folding plate type, or a pair of folding rolls that are also referred to as a rotary type. The facility to perform may be sufficient. However, it is desirable to use a rotary type interfolder. In the case of tissue paper products with a multi-ply structure of 3 plies or more, the number of layers is large and the displacement of each layer is likely to occur. However, the rotary interfolder has weaker tension applied to continuous sheets than other equipment. As a result, each layer is less likely to be displaced, and the folding quality is likely to be good. Therefore, it is difficult to reduce the “soft feeling” especially during processing.

  The tissue paper used for manufacturing the tissue paper and its products according to the present embodiment is preferably the following. The outer base paper constituting the outer layer preferably has a dry paper strength in the vertical direction of 182 cN / 25 mm or more and 247 cN / 25 mm or less, and a dry paper strength in the horizontal direction of 90 cN / 25 mm or more and 129 cN / 25 mm or less. Further, it is desirable that the intermediate layer base paper has a dry paper strength in the vertical direction of 96 cN / 25 mm or more and 153 cN / 25 mm or less, and a dry paper strength in the horizontal direction of 49 cN / 25 mm or more and 83 cN / 25 mm or less. Further, the crepe rate of the base paper is preferably 14 to 16% for the outer base paper and 16 to 18% for the middle base paper. In order to give a difference in paper strength between the outer layer base paper and the middle layer base paper, it is only necessary to adjust the addition amount of the paper strength agent, the basis weight, the paper thickness, and the like during paper making. The dry tensile strength and wet tensile strength of each of the base papers according to the present invention are the above-mentioned dry tensile strength of tissue paper and wet tensile strength of tissue paper, except that the test piece is a one-ply base paper made with a papermaking facility. Measure in the same way as strength.

  In the case of using these outer layer base paper and middle layer base paper, it is preferable to apply a moisturizing chemical to the front and back surfaces of the laminated sheet having a three-layer structure in which the middle layer base paper is the middle layer and the outer layer base paper is both outer layers.

  The laminated sheet having a three-layer structure has a ratio of the vertical dry paper strength of the outer base paper to the vertical dry paper strength of the middle base paper that is more than 0.47 and less than 0.66, and the horizontal direction of the middle base paper It is preferable that the ratio of the dry paper strength in the lateral direction of the outer layer base paper to the dry paper strength of more than 0.51 and less than 0.67. It should be noted that both outer layer base papers do not necessarily have the same physical property composition, but in that case, it is desirable that each outer layer and middle layer satisfy the above-mentioned relationship. That is, it is preferable that the middle layer base paper has the above ratio with respect to any outer layer base paper.

  Moisturizing that contains glycerin and 1,3-propanediol and the mass ratio of glycerin and 1,3-propanediol is 1: 0.07 or more and 1: 0.18 or less with respect to the laminated sheet having the three-layer structure. The chemical solution is applied so that it contains 6.1% by mass to 12.6% by mass in absolute terms. The absolute time is a state in which the manufactured tissue paper is dried at a temperature of 65 ° C. and a humidity of 10% until a constant weight is obtained. Moreover, containing means the ratio in paper, and is the ratio of the mass of glycerol and 1.3 propanediol with respect to the mass of tissue paper. In order to obtain such a content ratio, for example, the ratio of glycerin and 1.3 propanediol to water in the moisturizing liquid is adjusted to 1: 5.44 to 1: 5.61, and this is adjusted to 7. What is necessary is just to give 5 mass% or more and 13.0 mass% or less. However, in order to contain glycerin and 1,3-propanediol in an absolute amount of not less than 6.1% by mass and not more than 12.6% by mass, the method and the numerical range are not necessarily limited. The mass ratio of glycerin and 1,3-propanediol in the moisturizing liquid is almost maintained even when the product is completely dry. Moreover, you may contain well-known adjuvants other than glycerol and 1, 3- propanediol in the moisturizing liquid so long as the effect of the present invention is not hindered. The content is about 5% by mass or less in the chemical solution as a whole. Examples of auxiliaries include moisturizing auxiliary components such as sorbitol, hydrophilic polymer gelling agents, surfactants and flexibility improvers to enhance moisture retention in tissue paper, and assist in the expression of smoothness. Other examples include oily components such as liquid paraffin, emulsifiers, antiseptics, antifoaming agents, etc. for improving the stability and stability of the moisturizing agent. In addition, the amount of ingredients such as moisturizing auxiliary ingredients and hydrophilic polymer gelling agents that enhance moisture retention has an excessive effect on "soft bulkiness", "softness" and "surface smoothness". To the extent that does not affect Specifically, it is 1.0% by mass or less, preferably 0.6% by mass or less, and more preferably 0.5% by mass or less.

  In the tissue paper product manufacturing method according to the present embodiment, the dry paper strength of the product with respect to the dry paper strength of each base paper is moderately reduced, and in the vertical direction, the dry paper strength is generally reduced in the range of 27.6% to 42.7%. In the lateral direction, it decreases in the range of approximately 58.1% to 75.6%. In addition, the moisture content in the paper becomes constant due to transpiration, moisture absorption, etc. after applying the moisturizing chemical solution, and as a result, the `` softness '' while feeling the `` soft and bulky feeling '' of the physical properties and composition according to the above embodiment. And tissue paper that can feel “smoothness” is produced.

  Furthermore, in particular, when manufacturing the tissue paper product of the present embodiment, it is preferable to use a rotary interfolder as the interfolder. In addition, it is desirable to perform calendar processing on the laminated sheet. By performing calendering on the laminated sheet, it becomes easy to cause a difference in paper thickness between the outer layer and the middle layer. In particular, when folding is performed with a rotary interfolder, it is desirable to apply a moisturizing chemical solution within the interfolder. Furthermore, when the first calendering process is performed before applying the moisturizing chemical solution and the second calendering process is performed after applying the moisturizing chemical solution, the “softness” is felt while feeling “soft and bulky”. It is easy to make tissue paper that can feel “smoothness” remarkably.

  Next, the effects of the tissue paper according to the present embodiment described above will be described in particular in “Examples”.

The tissue paper according to the present invention and a sample related to the tissue paper different from the present invention were prepared, and the following sensory test was performed using "soft bulkiness", "softness", and "surface smoothness" as evaluation items. It was. The physical properties and composition values of each sample were measured as follows. The physical property values, composition values, and test results of each sample are as shown in Tables 1 and 2 below.
[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 according to the thickness measurement method described above using a dial thickness gauge (thickness measuring instrument) “PEACOCK G type” (manufactured by Ozaki Seisakusho).
〔density〕
It was calculated from the basis weight of 3 plies (basis weight of 1 ply × 3) and the paper thickness of 3 plies. The unit is g / cm ³ and is expressed by two decimal places. The three-ply paper thickness was measured in the same manner as measuring the paper thickness of each layer without peeling off the layers.

[Dry tensile strength]
It was measured according to the tensile test of JIS P 8113 (1998).
The test piece used was cut into a width of 25 mm (± 0.5 mm) and a length of about 150 mm in both the vertical and horizontal directions. In the case of tissue paper, when multiple plies were used, the measurement was performed with multiple plies. As a tester, a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. was used. The holding interval was set to 100 mm. The measurement was performed by tightening both ends of the test piece to the grip of the testing machine, applying a tensile load in the vertical direction, and reading the indicated value (digital value) when the paper breaks. The tensile speed was 100 mm / min. Five sets of samples were prepared in each of the longitudinal direction and the transverse direction and measured 5 times each, and the average of the measured values was taken as the dry tensile strength in each direction. (Sample preparation is JIS P 8111 (1998))

(Wet tensile strength)
It was measured according to the tensile test of JIS P 8135 (1998).
The test piece used was cut into a width of 25 mm (± 0.5 mm) and a length of about 150 mm in both the vertical and horizontal directions. In the case of tissue paper, when multiple plies were used, the measurement was performed with multiple plies. As a tester, a load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. was used. The holding interval was set to 100 mm. For measurement, both ends of a test piece cured for 10 minutes with a dryer at 105 ° C. were clamped to the grip of the test machine, and then using a flat brush dampened with water, about 10 mm in the center of the test piece. Water was applied horizontally in the width, and then a tensile load was immediately applied to the paper piece in the vertical direction to read the indicated value (digital value) when the paper broke. The tensile speed was 50 mm / min. Five sets of samples were prepared for each of the machine direction and the transverse direction and measured 5 times each, and the average of the measured values was taken as the wet tensile strength in each direction.

〔Growth rate〕
According to the tensile test of JIS P 8113 (1998), the load cell tensile tester TG-200N manufactured by Minebea Co., Ltd. was used, and the measurement was performed according to the sample related to the dry tensile strength and the measurement procedure.

[Softness]
It measured according to the handle ohm method according to JISL1096E method. However, the test piece was 100 mm × 100 mm in size, and the clearance was 5 mm. One ply was measured 5 times each in the vertical direction and the horizontal direction, and the average value of all 10 times was expressed in units of cN / 100 mm. Softness is one of the indices of softness.

[MMD]
It measured according to the above-mentioned MMD measuring method. That is, MMD was measured with a standard 10 mm square piano wire sensor using a friction feeling tester KES-SE manufactured by Kato Tech Co., Ltd. The measurement condition is that the sample is fixed in a predetermined direction with a tension of 20 g / cm, and the contact is brought into contact with the surface of the measurement sample with a contact pressure of 25 g. The movement was performed in approximately the same direction by 2 cm at a speed of 0.1 cm / s. One ply was measured 5 times each in the vertical direction and the horizontal direction, and the average value of all 10 times was expressed as a dimensionless unit. MMD is one index of smoothness.

[Contents of glycerin and 1.3 propanediol]
The content of glycerin and 1.3 propanediol is a ratio in the paper, which is a ratio of the mass of glycerin and 1.3 propanediol to the mass of the sample when completely dried. The absolutely dry state is a state where the temperature is 65 ° C. and the humidity is 10% until the weight becomes constant.

[Sensory test]
With 30 evaluators and Comparative Example 1 as a reference sample, “soft” and “soft”, “smoothness of surface” and “very excellent” in comparison with the reference sample “5” for those who felt “4”, “4” for those who felt “excellent”, “3” for those who felt “not good or inferior”, and “bad” for those who felt “bad” “2” and “very bad” were evaluated as “1”, and the average score of each evaluator was calculated as an evaluation value.

  In addition, “Comprehensive evaluation” is “5” for those who feel “good touch and very high intention to purchase”, “4” for those who feel “good touch and high intention to purchase”, “ “3” for those who feel that the touch is normal, and that the purchase intention is high or low can be said to be “3”; for those that feel that “the touch is poor and the purchase intention is low”, “2”, “the touch is very Those who felt that they were inferior and almost not intending to purchase were evaluated as “1”, and the average score of each evaluator was calculated as the evaluation value. In addition, Comparative Example 1 is a 4-ply commercial product containing a drug and belongs to the category of high-end products with a very high market price.

〔Test results〕
Table 1 summarizes the test results obtained by changing the contents of glycerin and 1,3-propanediol. Table 2 summarizes the test results of changing the ratio and content of glycerin and 1,3 propanediol. FIG. 2 is a graph showing the sensory evaluation of Table 1, and FIG. 3 is a graph showing the sensory evaluation of Table 2.

  As shown in Table 1 and FIG. 2, in Comparative Example 3, Examples 1 to 5 and Comparative Example 4, the ratio of glycerol to 1,3 propanediol was fixed at 1: 0.07, and glycerol and 1,3 Propanediol content is different. When these are compared, “softness”, “smoothness”, and “softness” are in Comparative Example 1 (standard) in the range of the content of 6.1 to 12.6% by mass, which is an example of the present invention. Product). Moreover, although the Example is 3 ply, the result superior to the comparative example 1 of 4 ply was obtained. Moreover, the comparative example 2 which does not contain 1,3 propanediol is inferior to the comparative example 1 which is a reference | standard paper stock.

  Next, as shown in Table 2 and FIG. 3, Comparative Examples 5 to 9 and Examples 6 to 12 differ in the ratio and content of glycerin and 1,3 propanediol. When comparing these, in the range of the content according to the present invention, especially in the ratio of glycerin and 1,3 propanediol according to the present invention, “soft”, “smoothness”, “soft feeling” are compared. The result was significantly better than Example 1 (reference product).

  From these facts, it can be said that the use of the tissue paper of the present invention is remarkably excellent in “softness”, “smoothness”, and “softness”.

Claims (3)

3 ply tissue paper
It contains 6.1% by mass or more and 12.6% by mass or less of glycerin and 1,3-propanediol, and the ratio of glycerin and 1,3-propanediol is 1: 0.07 or more and 1: 0.18 or less. ,
The basis weight of each layer at the time of product is at 13.4 g / m ² or more 16.0 g / m ² or less,
The outer layer has a paper thickness of 64 μm or more and 76 μm or less, and the outer layer has an MMD of 5.0 or more and 6.1 or less,
The paper thickness of the middle layer is 49 μm or more and 59 μm or less, the MMD of the middle layer is 5.8 or more and 7.1 or less,
The paper thickness at 3 plies is 193 μm or more and 227 μm or less,
The dry strength in the vertical direction is 301 cN / 25 mm or more and 414 cN / 25 mm or less,
The transverse dry strength is 89 cN / 25 mm or more and 125 cN / 25 mm or less,
The wet tensile strength in the transverse direction / the dry tensile strength in the transverse direction is 0.40 or more and 0.54 or less,
Tissue paper characterized by that. An outer base paper having a dry paper strength of 182 cN / 25 mm or more and 247 cN / 25 mm or less in the vertical direction and a dry paper strength of 90 cN / 25 mm or more and 129 cN / 25 mm or less in the horizontal direction;
An intermediate base paper having a dry paper strength in the longitudinal direction of 96 cN / 25 mm or more and 153 cN / 25 mm or less, and a dry paper strength in the transverse direction of 49 cN / 25 mm or more and 83 cN / 25 mm or less;
Has a three-layer structure,
The ratio of the longitudinal dry paper strength of the intermediate base paper to the vertical dry paper strength of the outer base paper is more than 0.47 and less than 0.66, and the lateral direction of the intermediate base paper with respect to the lateral dry paper strength of the outer base paper The ratio of the dry paper strength is more than 0.51 and less than 0.67.
For the front and back of the laminated sheet,
A moisturizer containing glycerin and 1,3-propanediol, wherein the mass ratio of glycerin and 1,3-propanediol is 1: 0.07 or more and 1: 0.18 or less. Is given in such a way that it contains 6.1% by mass to 12.6% by mass in absolute terms.
A method for producing a tissue paper product. A first calendar processing step to be performed before applying the moisturizing liquid,
A second calendar processing step to be performed after applying the moisturizing chemical,
The tissue paper product manufacturing method according to claim 2, further comprising: a folding process step of folding with a rotary interfolder.

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