TW201816230A - Tissue paper - Google Patents

Abstract

To provide a non-moisturizing type of tissue paper which is superior in skin contact feel. The problem is solved by a two-ply per sheet tissue paper which does not include a moisturizing agent, in which the basis weight per ply is 12.5 - 16.0 g/m2, the ratio (vertical/horizontal) of a dry tensile strength in the vertical direction to a dry tensile strength in the horizontal direction is 3.8 - 5.1, the rigidity is 2.0 - 2.8, and the ratio (rigidity value/kinetic friction coefficient mean value) of a rigidity value to a kinetic friction coefficient mean value is 1.73 - 2.11.

Description

Tissue paper

The present invention relates to a facial paper, and more particularly to a facial paper that is not coated (unadded) with a humectant.

Tissue paper can be roughly divided into: face paper made by adding a moisturizing agent such as polyhydric alcohol to the base paper; and face paper without a moisturizing agent.

The moisturizing facial paper is called moisturizing facial paper, medicine-adding facial paper, etc., and the moisture absorption effect of the moisturizing agent can increase the moisture content and improve the softness and smoothness.

In contrast, facial tissues without added moisturizers are mainly cost-conscious products. They are also known as universal facial tissues and universal types. However, even in facial tissues without moisturizers, There are premium products, which have a high basis weight and belong to high-quality types such as moisturizing facial tissues. These facial papers are sometimes collectively referred to as non-moisturizing facial papers and non-moisturizing facial papers.

Medicinal-added facial tissues are mainly used to increase the softness of the skin by increasing the moisture content produced by moisturizers, so they are specially used for blowing your nose and wiping your face.

On the other hand, even in non-moisturizing facial papers, especially the universal type, it is not only used to wipe dust, dust, etc., but also used to blow nose and wipe the face very frequently. Especially high-quality non-moisturizing facial tissues, like moisturizing facial tissues, are mostly used for blowing nose and wiping face.

Even in such non-moisturizing facial papers, whether it is a general-purpose or premium product, it is used for blowing the nose and rubbing the face very frequently, so its good touch is a characteristic required by consumers.

However, the previous evaluation of the quality of the touch paper, whether it is for moisturizing or non-moisturizing paper, is simply based on human skin and based on "softness", "smoothness", and "thickness" Such various sensory evaluation tests are performed. However, such an evaluation method is difficult to perform quantitative evaluation. In addition, it is considered that the physical properties that impart functionality to the facial paper are not necessarily the same for a moisturizing facial paper that the increase in moisture content significantly affects the functional evaluation and a non-moisturizing facial paper that does not include a moisturizing agent that increases the moisture content. . Therefore, it is difficult to design a higher-quality non-moisturizing facial paper based on the design of the above-mentioned sensory evaluation. [Prior Art Literature] (Patent Literature)

Patent Document 1: Japanese Patent No. 4570669.

[Problems to be Solved by the Invention] The main problem to be solved by the present invention is to provide a non-moisturizing facial paper whose sensory evaluation value regarding touch is unprecedentedly high. [Technical means to solve the problem]

The means to solve the above-mentioned problems to be solved are as follows.

The first aspect of the present invention is a facial paper, which is a two-layer, one-pumped facial paper that does not contain a moisturizing agent. The facial paper is characterized in that the basis weight of each layer is 12.5 to 16.0 g / m ² in the longitudinal direction. The ratio of the dry tensile strength to the dry tensile strength in the transverse direction, that is, the dry tensile strength in the longitudinal direction / the dry tensile strength in the transverse direction is 3.8 to 5.1, the rigidity value is 2.0 to 2.8, and the rigidity value is relatively The ratio of the average value of the dynamic friction coefficient, that is, the rigidity value / average of the dynamic friction coefficient is 1.73 to 2.11.

The second aspect of the present invention is the facial tissue according to the first aspect described above, wherein the value obtained by multiplying the moisture content and the rigidity value, that is, the moisture content × rigidity value is 12.93 or less. [Effect of the invention]

According to the present invention as described above, it is possible to provide a non-moisturizing facial paper whose sensory evaluation value regarding touch is extremely high as never before.

Embodiments of the present invention will be described below.

The facial paper in the present invention is a facial paper containing a moisturizing agent without external application, such as coating, and is also called a non-moisturizing type, non-moisturizing facial paper, or the like. In addition, the so-called moisturizer in the present invention is a component contained in a facial tissue, and its main purpose is to increase the moisture content by a moisture absorption effect. As for the moisturizing facial tissue or the universal facial tissue, It can be used as a softener or paper improver for internal additives, and even if it has some moisturizing effect, it does not belong to the humectant of the present invention.

Moreover, in the present invention, the moisturizing agent that is not used as an external additive has hygroscopicity as the main effect. These moisturizing agents include glycerol, diglycerin, propylene glycol, and 1,3-butanediol. , Polyethylene glycol, sorbitol, glucose, xylitol, maltose, maltitol, mannitol, trehalose.

The number of layers and draws of the tissue paper are two draws and one draw, and the basis weight of each layer is 12.5 to 16.0 g / m ² . As long as the basis weight is 12.5 to 16.0 g / m ² , the effects of the present invention can be exhibited. Although the present invention does not necessarily need to limit the paper thickness, in the following measurement method, it is desirable that the total paper thickness of the two layers is in the range of 130 to 210 μm. Therefore, the effect of the present invention is easily exhibited.

The basis weight in the present invention means a value measured based on Japanese Industrial Standard JIS P 8124 (1998). In addition, the value of the paper thickness is a condition in which the test piece is sufficiently humidity-controlled under the conditions of Japanese Industrial Standard JIS P 8111 (1998), and a dial thickness gauge (thickness gauge) is used under the same conditions. "PEACOCK G type" (manufactured by Ozaki Seisakusho). The specific steps are as follows: first confirm that there is no residue or dust between the plunger and the measuring table, then lower the plunger to the measuring table, and make the scale of the aforementioned needle plate thickness gauge correct and move to coincide with the zero point, Then, the plunger was raised and the sample was placed on the test bench, and then the plunger was slowly lowered and the measured value at this time was read. At this time, the plunger is only in a state of contacting the sample. The terminal of the plunger is a circular plane made of metal and having a diameter of 10 mm, and is carried out so as to be perpendicular to the plane of the paper. The load during the measurement of the thickness of the paper is about 70 gf. The paper thickness is an average value obtained by performing 10 measurements.

On the other hand, the ratio of the dry tensile strength in the longitudinal direction to the dry tensile strength in the horizontal direction of the tissue paper in the present invention, that is, the dry tensile strength in the vertical direction / the dry tensile strength in the horizontal direction is 3.8 to 5.1, the rigidity value is 2.0 to 2.8, and the ratio of the rigidity value to the average value of the dynamic friction coefficient, that is, the average value of the rigidity value / the dynamic friction coefficient is 1.73 to 2.11. The facial paper in the present invention satisfies each of the above ranges if the average dry tensile strength in the longitudinal direction / dry tensile strength in the transverse direction, the rigidity value, and the average value of the rigidity value / dynamic friction coefficient are satisfied, although it is a non-moisturizing facial paper However, it can still show extremely excellent touch.

Here, the dry tensile strength in the present invention means a value measured by a tensile test based on Japanese Industrial Standard JIS P 8113 (1998).

The rigidity value is a value of compression stiffness measured by the following operation. First, as shown in FIG. 1, 5 sheets of folded tissue paper are overlapped on the water platform 3 as the sample 4, and then a metal plate 5 is placed on the water platform 3. The plate 5 is made of stainless steel that is flat and smooth, and has a weight of 187 g. Next, this stable position is set to an initial state, a weight 6 is placed on the metal plate 5, and the amount of displacement D from the reference position is measured by increasing the load by 0.196N to 0.98N each time. The displacement amount obtained in each load is plotted, and the mapping points are linearly approximated, and the inclination converted into each pump is calculated as the compressive rigidity of each tissue paper sample. The measurement of the amount of displacement from the reference position is measured by the laser measuring device 8 as shown in FIG. 1. For the measurement, sufficient precision can be obtained as long as the following conditions are set: the light source is a red semiconductor laser, the wavelength is 670 nm, the maximum output is 170 μW, the spot diameter is about 2 μm, and the resolving power is 0.01 μm. Examples of the laser measuring device include a double-scanning high-precision laser measuring device LT9000 series manufactured by Keynes Corporation, and in particular, a double-scanning high-precision laser measuring machine LT-9010M manufactured by Keynes Corporation can be used for measurement.

On the other hand, the moisture content in the present invention is the moisture content of the product. The moisture content is controlled under the conditions of Japanese Industrial Standard JIS P 8111 (1998), and then according to Japanese Industrial Standard JIS P 8127 (1998). Measured value.

In the facial tissue paper of the present invention, the value obtained by multiplying the moisture content and the rigidity value, that is, the moisture content × rigidity value is 12.93 or less.

The MMD is measured by moving the surface of the measurement sample at a contact pressure of 25 g while moving the surface by approximately 2 cm at a speed of 0.1 cm / sec in the direction substantially the same as the direction to which tension is applied, and using a friction sensor KES- SE (manufactured by Jado Technology Co., Ltd.) was used to measure the friction coefficient at this time, and the measurement sample was given a tension of 20 g / cm by the contact surface of the friction block in a specific direction. The value obtained by dividing the friction coefficient by the friction distance (moving distance = 2 cm) is the MMD. The friction block is formed by adjoining 20 piano wires P having a diameter of 0.5 mm, and has a contact surface which is formed so as to have a length and a width of 10 mm. The contact surface is a portion with a unit expansion portion formed by 20 piano wires P (curvature radius 0.25 mm) at the front end.

The average value of the dynamic friction coefficient in the present invention can be measured using a pin-on-plate type friction tester, which is an average value of the dynamic friction coefficient measurement device. As the pin-to-disk type friction test device, it may be appropriately selected from the following conditions: a sliding rate of 0.1 to 100.0 mm / sec, a vertical load of 0 to 1 kgf, and a sliding distance of 1 to 200 mm.

As shown in FIG. 2, the average value of the dynamic friction coefficient in the present invention is measured. First, on a horizontal platform 21 of the pin-to-disk friction test device 1, a face sheet 10 of sufficient size is placed in a folded state. One side edge portion 11 in the longitudinal direction is fixed by a jig 22 or the like. Thereafter, on the face paper 10, the contact block 23 was brought from the fixed direction toward the non-fixed edge portion 12 under the conditions of a sliding rate of 1.00 mm / sec, a vertical load F of 50 gf, and a sliding distance of 5.0 mm. Move horizontally in the direction (X direction in the figure), and measure the average value of the dynamic friction coefficient at this time. The so-called average value of the dynamic friction coefficient is an average value of the dynamic friction coefficient of each tissue paper sample at a sliding distance of 4 to 5 mm. The above-mentioned sliding rate, vertical load F, and sliding distance are values determined by a finger tactile sensor (HapLog) and based on the operation when five subjects use a tissue paper, for example, based on the implementation of a hand grip When taking a tissue or performing a wiping operation to confirm the touch, the values obtained by measuring the sliding rate, vertical load F, and sliding distance are measured. In this test, it is not necessary to distinguish between the MD direction (machine direction) and the CD direction (cross direction).

The measurement conditions are as follows: the laboratory temperature is 20 ° C, the laboratory humidity is 20% RH (relative humidity, relative humidity), and the lubrication state is a non-lubricated state in the atmosphere. In addition, the measurement sample was left in a chamber at 25 ° C. and 20% RH for 24 hours before being used for the experiment. Furthermore, during the measurement, the movement of the contact block 23 is performed in one direction rather than repeatedly. In addition, the contact block 23 is set as follows: a soft amine ester material having a contact area larger than that of a human fingertip and a hardness similar to that of a human finger is used, and further, the amine ester material is orthogonal to the movement direction along the direction of movement. A plurality of grooves similar to human fingerprints are formed in the direction. As a specific example of a device that performs this measurement, for example, Tribo Master Type μv1000 (model) manufactured by Trinity Lab Co., Ltd. is mentioned. In this device, it is sufficient to perform measurement by setting the contact block to an arbitrary "sensory contact block" also manufactured by Trinity Lab Co., Ltd.

Here, the following results will be described. In the face paper of the present invention, if the dry tensile strength in the longitudinal direction / the dry tensile strength in the transverse direction, the rigidity value, and the average value of the rigidity value / dynamic friction coefficient are satisfied: Although each of the above ranges is a non-moisturizing facial paper, it can still exhibit extremely excellent touch. Further, for the value obtained by multiplying the moisture content and the rigidity value, that is, the moisture content × the rigidity value is within the numerical range of the present invention It can become a tissue paper with better touch.

The inventors first performed a sensory evaluation test on most of the facial tissues currently available, and carried out various measurements including the average value of the dynamic friction coefficient in the present invention, and those that may affect the smoothness and softness. friction.

The sensory evaluation test is carried out in the following manner: Each tissue paper prepared as a sample is given to the subject in a random order, and for the blowing of the nose, touching with a hand, and performing wiping, etc., the subject is required to determine by the subject Use the tissue paper in a free method. Based on the subject's free usage pattern, use the "tactile" of each tissue paper made from "like" or "dislike" as a reference to sort and The sum of the scores of the sorted samples was set as the sensory evaluation value. In addition, the functional evaluation method used to perform the previous evaluation of the quality of the facial paper generally performs various evaluations such as softness, smoothness, thickness, and strength by comparing with standard samples, and then The scores of each evaluation are added up to set the total as the evaluation value. However, in this evaluation, only the pros and cons of the standard sample can be judged, and some people may feel the smoothness, but others may feel the possibility of softness, etc., so it is difficult to quantify and summarize. Sexual quality evaluation. The functional evaluation test in the present invention has an advantage that the previous method does not have: the first impression when using the tissue paper is evaluated in a free use state, and the functionality during use is significantly expressed.

On the other hand, since the previous sensory evaluation was based on comparison with standard samples, it is difficult to accurately grasp the relationship between the sensory evaluation and the paper parameters, but because the sensory evaluation test in the present invention becomes feasible The functionality at the time of use is expressed without any cognitive differences between users. Therefore, as long as the correlation between the functional evaluation value and the paper parameters is analyzed, the paper parameters that greatly affect the touch can be more precisely investigated.

In addition, the correlation between the measured value of the friction and the general paper parameters, and the results of the functional evaluation test in the present invention was analyzed by simple regression analysis and multiple regression analysis, and the dynamic friction in the present invention was confirmed. The correlation between the coefficient average value and the sensory evaluation value is extremely high, so that a specific regression equation regarding the sensory evaluation value and the average value of the dynamic friction coefficient is obtained.

Next, if we try to compare the correlation between non-moisturizing facial paper, moisturizing facial paper, paper parameters, and the above average value of dynamic friction, although moisturizing facial paper with a high moisture content will greatly affect the moisture content, in non-moisturizing facial paper, There is not much difference in moisture content between products, so paper parameters other than moisture content can also be predicted.

Therefore, for non-moisturizing facial paper, a multiple regression analysis is performed to analyze the paper parameters that affect the average value of the dynamic friction coefficient. First, as a paper parameter including commercially available non-moisturizing facial papers, the paper thickness, dry tensile strength in the vertical and horizontal directions, wet tensile strength in the horizontal direction, arithmetic average roughness, and arithmetic average are measured. The arithmetic mean waviness and regression analysis of these parameters were performed, but no significant correlation was found. Therefore, based on the fact that facial tissues are formed by most fiber networks, and users of facial tissues use their fingers to pinch, knead facial tissues, or perform operations on the periphery of their noses, the inventors predict facial tissues. A certain displacement in the thickness direction affects the staggered state of the fibers, and changes the fiber density on the surface, which affects friction. Therefore, the displacement in the thickness direction is measured as described above, and the rigidity value is defined.

In addition, when the independent variables were selected for the paper parameters again, and the analysis was performed by multiple regression analysis using a stepwise method, although the mechanism was not clear, it was found that the above rigidity value can best explain the average value of the dynamic friction coefficient, and thus obtained Specific regression formula, the paper parameters include the average value of the dynamic friction coefficient, the moisture content, the paper thickness, the dry tensile strength in the longitudinal and transverse directions, the wet tensile strength in the transverse direction, the arithmetic mean thickness, the arithmetic mean fluctuation, density, Rigid value. That is, the average value of the dynamic friction coefficient in the present invention can be clearly explained by the rigidity value obtained by the above-mentioned measurement method as predicted, and it is confirmed that an increase in the rigidity value is effective in reducing the average value of the dynamic friction coefficient. In addition, based on the above regression formula, the inventor based on the idea of designing a tissue paper in a range of rigid values that cannot be achieved in current tissue paper, thereby completing the tissue paper in the present invention, which is the following tissue paper, which The rigidity value is 2.0 to 2.8, and the ratio of the rigidity value indicating positive correlation to the average value of dynamic friction coefficient indicating negative correlation, that is, the average value of rigidity / dynamic friction coefficient is 1.73 to 2.11.

In addition, the above-mentioned rigidity values and the like can make the dry tensile strength in the longitudinal direction / the dry tensile strength in the transverse direction particularly within the high range of the present invention when manufacturing the face paper in the present invention. In addition, if the value obtained by multiplying the water content rate and the rigidity value, that is, the water content rate × rigidity value is 12.93 or less, and the element of the water content rate is added, the quality of high evaluation can be more surely obtained. Further, it was found that the rigidity value in the present invention can be achieved by adjusting the blending ratio of raw material pulp, especially NBKP (softwood kraft pulp, long-fiber pulp) and LBKP (hardwood kraft pulp, short fiber pulp); adjusting the braid angle when imparting dry crepe paper; and further using a softener compound, a wet paper strength agent, and a dry paper strength agent to produce a facial paper. In particular, it has been found that the rigidity value of the present invention can be easily reached by adjusting the mesh of a large bulky wire for papermaking. If the mesh of a large papermaking net is made finer than the mesh used for the normal manufacture of facial paper, the facial paper which has the rigidity value of this invention can be manufactured easily. It is thought that this is because the mesh size of the large papermaking net can adjust the amount of fibers in the surface layer of the paper and the density of the paper layer. [Example]

Next, examples of the face paper in the present invention will be described in detail.

The following Table 1 shows the physical property values and functional evaluation values of the facial paper (Examples 1 to 5) in the present invention and the facial paper (Comparative Examples 1 to 8) of the conventionally available products. Various physical property values and functional evaluation values were measured according to the above-mentioned measurement methods. In addition, Examples 1 to 5 and Comparative Examples 1 to 5 are non-moisturizing facial papers containing no moisturizing agent, and Comparative Examples 6 to 8 are moisturizing facial papers containing a moisturizing agent.

[Table 1]

The facial tissue in the embodiment of the present invention is produced in the following manner. First, commercially available products, that is, the non-moisturizing facial papers of Comparative Examples 1 to 5 and the moisturizing facial papers of Comparative Examples 6 to 8, were subjected to a sensory evaluation test in the present invention. As described above, this sensory evaluation test is a random order and sorted only by the sense of touch, and the score is evaluated by 30 subjects on a scale of 1 to 5. That is, each case will be evaluated as a score between a minimum of 30 points and a maximum of 150 points. The sensory evaluation value in the table is a score of the sensory evaluation test. Furthermore, regression analysis was performed on the correlation between the functional evaluation value and the paper parameters of each example, and it was confirmed that the average value of the dynamic friction coefficient is the paper parameter that can best explain the functional evaluation value. The average value of the dynamic friction coefficient in the table is the measured value. Furthermore, regression analysis was performed on the average value of the dynamic friction coefficient and the paper parameter with high correlation, and it was confirmed that a high correlation with the rigid value was obtained.

In addition, for the moisturizing facial papers, that is, Comparative Examples 6 to 8, and in the same manner as Comparative Examples 1 to 5, regression analysis was performed on paper parameters having a correlation with the average value of the dynamic friction coefficient. Paper parameters for moisture content.

In addition, the moisture ratios in Examples 1 to 5 and Comparative Examples 1 to 5 and the moisture ratios in Comparative Examples 6 to 8 were compared, and it was confirmed that in the non-moisturizing facial paper, the contribution of the moisture ratio to the average value of the dynamic friction coefficient ( Less affected.

Examples 1 to 5 in the present invention were first produced by the following method: Based on the regression formula obtained by the regression analysis of the average value of the dynamic friction coefficient and the rigidity value in Comparative Examples 1 to 5, the previous market is specified A range of high rigidity values not included in the sales product is used to make a tissue paper having a rigidity value within this range. Then, it was confirmed that the moisture content of the prepared facial paper was not significantly different from that of Comparative Examples 1 to 5.

Therefore, the following facial papers are referred to as Examples 1 to 5. The facial papers have a moisture content similar to that of non-moisturizing facial papers, and have rigidity values not previously available in commercial products.

Then, when the measurement of the average value of the dynamic friction coefficient and the evaluation of the above-mentioned functional test were carried out in Examples 1 to 5, as expected, the average value of the dynamic friction coefficient was generally smaller than that of the comparative example, and good results could be obtained from the functional evaluation value.

As shown by the experiments in the above examples, the facial paper in the present invention has become a non-moisturizing facial paper, which has a specific rigidity value and a sensory evaluation value of the consumer is unprecedentedly high.

1‧‧‧ Device for measuring average value of dynamic friction coefficient

10‧‧‧ Tissue Paper Sample

11‧‧‧ side edge

12‧‧‧ non-fixed edge

21‧‧‧platform

22‧‧‧Jig

23‧‧‧contact block

3‧‧‧water platform

4‧‧‧ sample

5‧‧‧ metal plate

6‧‧‧ Heavy

8‧‧‧laser tester

D‧‧‧Displacement

F‧‧‧Vertical load

FIG. 1 is a diagram for explaining a method for measuring a rigidity value in the present invention. FIG. 2 is a diagram for explaining a method for measuring the average value of the kinetic friction coefficient in the present invention.

Domestic hosting information (please note in order of hosting institution, date, and number) None

Information on foreign deposits (please note in order of deposit country, institution, date, and number) None

Claims (2)

A facial paper, which is a two-layer, one-pumped facial paper that does not contain a moisturizing agent. The facial paper is characterized in that: the basis weight of each layer is 12.5 to 16.0 g / m ² ; The ratio of the dry tensile strength in the direction, that is, the dry tensile strength in the longitudinal direction / the dry tensile strength in the transverse direction is 3.8 to 5.1, the rigidity value is 2.0 to 2.8, and the ratio of the rigidity value to the average value of the dynamic friction coefficient That is, the average value of rigidity / dynamic friction coefficient is 1.73 to 2.11. The facial paper according to claim 1, wherein the value obtained by multiplying the moisture content and the rigidity value, that is, the moisture content × the rigidity value is 12.93 or less.