TWI752096B - facial tissue - Google Patents

Abstract

The problem to be solved by the present invention is to provide a non-moisturizing type facial paper having an excellent touch. The above problems can be solved by the following facial paper, which is a two-layer, one-pumped facial paper that does not contain a moisturizing agent, wherein the basis weight of each layer is 12.5-16.0 g/m ² , and the longitudinal The ratio of the dry tensile strength in the direction 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 stiffness value is 2.0 to 2.8, and the stiffness The ratio of the value to the average value of the coefficient of kinetic friction, that is, the stiffness value/average value of the coefficient of kinetic friction is 1.73 to 2.11.

Description

facial tissue

The present invention relates to a facial tissue, in particular to an uncoated (no added) facial tissue with a moisturizing agent.

Facial paper can be roughly divided into: facial paper which adds humectant, such as polyol, by adding a method other than base paper; and facial paper which does not add humectant.

Facial paper with added moisturizing agent is called moisturizing facial paper, medicament-added facial paper, etc. By the hygroscopic effect of the moisturizing agent, it can increase the moisture content, and improve the softness and smoothness.

On the other hand, facial tissues without moisturizing agent are mainly cost-conscious products. They are also called general-purpose facial tissues, general-purpose facial tissues, etc., but even among facial tissues without moisturizing agent, they are still There are premium products, which have a high basis weight and belong to high-quality categories such as moisturizing facial tissue. These tissues are sometimes collectively referred to as non-moisturizing tissues, non-moisturizing tissues, and the like.

The medicated type of facial tissue is mainly used for blowing nose and wiping the face because it increases the softness mainly by the effect of increasing the moisture content of the moisturizing agent.

On the other hand, even in non-moisturizing facial tissue, especially general-purpose type, it is not only used to wipe off dust, dust, etc., but also used to blow the nose and wipe the face very frequently. In particular, non-moisturizing facial tissue is a high-end product. Like moisturizing facial tissue, it is mostly used for blowing your nose and wiping your face.

Even among such non-moisturizing facial tissues, whether they are general-purpose or high-end products, they are frequently used for nose blowing and face wiping, so their good touch is a characteristic demanded by consumers.

However, the previous quality evaluation of facial tissue such as touch, whether it is for moisturizing facial tissue or non-moisturizing facial tissue, is simply based on human skin, and is based on "softness", "smoothness", and "thickness". Such various sensory evaluation tests are performed. However, with such an evaluation method, it is difficult to perform quantitative evaluation. In addition, it is also considered that the physical properties imparting functionality to the facial tissue are not necessarily the same in the moisturizing facial tissue that greatly affects the functional evaluation due to an increase in the moisture content and the non-moisturizing facial tissue that does not contain a moisturizing agent that increases the water content. . Therefore, it is difficult to design a higher-quality non-moisturizing facial tissue based on the design based on 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 tissue, the sensory evaluation value of which is unprecedentedly high for consumers regarding touch. [Technical means to solve the problem]

Means for solving 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 12.5-16.0 g/m ² , and the longitudinal direction is 12.5-16.0 g/m 2 . 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 stiffness value is 2.0 to 2.8, and the stiffness value is relative to The ratio of the average value of the coefficient of kinetic friction, that is, the stiffness value/average value of the coefficient of kinetic friction is 1.73 to 2.11.

A second aspect of the present invention is the tissue paper according to the first aspect, wherein the value obtained by multiplying the moisture content and the stiffness value, that is, the moisture content×stiffness value is 12.93 or less. [Effect of invention]

According to the present invention as described above, it is possible to provide a non-moisturizing facial tissue having an unprecedentedly high consumer sensory evaluation value regarding touch.

Embodiments of the present invention will be described below.

The facial paper in the present invention is a facial paper that does not contain a moisturizing agent by external additions such as coating, and is also referred to as a non-moisturizing type, a non-moisturizing facial paper, and the like. Furthermore, the so-called moisturizing agent in the present invention is a component contained in the facial tissue, and its main purpose is to increase the moisture content by the hygroscopic effect. Softeners or paper modifiers that will be used as internal additives, even if they have some moisturizing effects, do not belong to the moisturizing agents of the present invention.

Furthermore, in the present invention, the humectant that is not used as an external additive has hygroscopicity as its main effect, and these humectants include: glycerin, diglycerol, propylene glycol, 1,3-butanediol , polyethylene glycol, sorbitol, glucose, xylitol, maltose, maltitol, mannitol, trehalose.

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

The basis weight in the present invention means a value measured based on Japanese Industrial Standards JIS P 8124 (1998). In addition, the value of paper thickness is obtained under the conditions of Japanese Industrial Standard JIS P 8111 (1998), after the test piece is subjected to sufficient humidity control, under the same conditions, a dial thickness gauge (dial thickness gauge, thickness gauge) is used. Values measured by "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 (plunger) and the measuring table, then lower the plunger to the measuring table, and make the scale of the aforementioned dial thickness gauge, calibrate and move to coincide with the zero point, Next, the plunger was raised and the sample was placed on the test stand, and then the plunger was slowly lowered to read the measured value at that time. At this time, the plunger is only in a state of contacting the sample. The terminal of the plunger was made of metal and had a circular flat surface with a diameter of 10 mm, and it was carried out so as to be perpendicular to the paper plane, and the load at the time of measuring the paper thickness was about 70 gf. The paper thickness was an average value obtained by performing 10 measurements.

On the other hand, in the facial paper of the present invention, the ratio of the dry tensile strength in the longitudinal direction 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 3.8 5.1, the stiffness value is 2.0-2.8, the ratio of the stiffness value to the average value of the coefficient of kinetic friction, that is, the stiffness value/average value of the coefficient of kinetic friction is 1.73-2.11. The facial paper of the present invention is a non-moisturizing facial paper, provided that the dry tensile strength in the longitudinal direction/the dry tensile strength in the transverse direction, the stiffness value, and the stiffness value/dynamic friction coefficient average value satisfy each of the above-mentioned ranges. However, an extremely excellent tactile feel can still be exhibited.

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

In addition, the stiffness value is a value of compression stiffness measured by the following operation. First, as shown in FIG. 1 , five pieces of tissue paper folded in half are stacked on the water table 3 as a sample 4 , and then a metal plate 5 is placed thereon, and the position in a stable state is set as a reference position. The plate 5 was made of stainless steel with flat and smooth front and back, and the weight was 187 g. Next, this stable position was set as the initial state, the weight 6 was placed on the metal plate 5, and the displacement amount D from the reference position was measured by increasing the load by 0.196N to 0.98N each time. The amount of displacement obtained in each load was plotted, and the plotted points were linearly approximated, and the inclination per draw was calculated as the compressive rigidity of each face paper sample. In addition, the measurement of the displacement amount from the reference position is performed by the laser measuring device 8 as shown in FIG. 1 . For the measurement, sufficient precision can be obtained as long as the light source is a red semiconductor laser, the wavelength is 670 nm, the maximum output is 170 μW, the spot diameter φ is about 2 μm, and the resolving power is 0.01 μm. Examples of the laser measuring instrument include the double-scanning high-precision laser measuring instrument LT9000 series manufactured by Keynes Corporation, and the measurement can be performed particularly by the double-scanning high-precision laser measuring instrument LT-9010M manufactured by Keynes Corporation.

On the other hand, the moisture content in the present invention is the moisture content of the product, which is based on the Japanese Industrial Standard JIS P 8127 (1998) after subjecting the sample to humidity control under the conditions of the Japanese Industrial Standard JIS P 8111 (1998). the measured value.

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

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

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

In the measurement of the average value of the coefficient of kinetic friction in the present invention, as shown in FIG. 2, first, on the horizontal platform 21 of the aforementioned pin-to-disk friction test apparatus 1, the surface paper 10, which is a sample of sufficient size, is placed in a folded state in half. , and fix one side edge portion 11 in the longitudinal direction by a jig 22 or the like. Then, on the surface paper 10, the contact blocks 23 are brought into contact from the fixed direction toward the non-fixed edge portion 12 under the conditions of a sliding speed 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 kinetic friction coefficient at this time. The so-called average value of the coefficient of kinetic friction is the average value of the coefficient of kinetic friction of each tissue paper sample in a sliding distance of 4 to 5 mm. Furthermore, the above-mentioned sliding rate, vertical load F, and sliding distance are values determined by the finger tactile sensor (HapLog) and based on the operation of 5 subjects when using the tissue paper, for example, based on the implementation of hand grasping. The value obtained by measuring the sliding rate, the vertical load F, and the sliding distance when performing an operation such as wiping off the tissue paper or wiping in order to confirm the feeling of touch. In addition, in this test, it is not necessary to distinguish between the MD direction (machine direction, machine direction) and the CD direction (cross direction, cross direction).

The measurement conditions are as follows: the laboratory temperature is 20°C, the laboratory humidity is 20% RH (relative humidity), and the lubricated state is a non-lubricated state in the atmosphere. In addition, the measurement sample was placed in a chamber at 25°C and 20% RH for 24 hours before being tested. Furthermore, during the measurement, the movement of the contact block 23 is performed by unidirectional sliding instead of repeated sliding. In addition, the contact area 23 is set as follows: using a soft urethane material with a contact area larger than the left and right of a human fingertip and a hardness similar to that of a human finger, and further on the urethane material, along the direction orthogonal to the moving direction A plurality of grooves similar to human fingerprints are formed in the direction. As a specific example of the apparatus which performs this measurement, Tribo Master Type μv1000 (model number) by Trinity Lab Co., Ltd. is mentioned, for example. In this apparatus, it is sufficient to set the contact block to be an arbitrary "sensory contact block" manufactured by Trinity Lab Co., Ltd. to perform the measurement.

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

The inventors of the present invention first conducted a sensory evaluation test on most of the currently available face papers, and conducted various measurements including the average value of the coefficient of kinetic friction in the present invention, and other factors that may affect smoothness and softness. friction.

The sensory evaluation test was carried out in the following manner: each tissue paper prepared as a sample was handed over to the subjects in random order, and the subjects were asked to decide on the subject's own discretion for blowing nose, touching with hands, and wiping. To use the tissue paper in a free way, based on the subject's free usage pattern, only "like" or "dislike" the "tactile feeling" of each tissue paper that was made into the sample was ranked, and the The sum of the scores of the sorted individual samples is set as the sensory evaluation value. In addition, the method of sensory evaluation for the quality evaluation of the previous tissue paper is generally carried out in comparison with a standard sample to carry out various evaluations such as softness, smoothness, thickness, and strength, and then The scores of the individual evaluations are added to make the sum total as the evaluation value. However, in this evaluation, it is only possible to judge the pros and cons of the standard sample, 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 sensory evaluation test in the present invention has the advantage that the conventional method does not have the advantage of evaluating the first impression when using the facial paper in a free use state, and remarkably expressing the functionality at the time of use.

On the other hand, since the previous sensory evaluation as described above is mainly based on comparison with standard samples, it is difficult to accurately grasp the relationship between sensory evaluation and paper quality parameters, but the sensory evaluation test in the present invention becomes possible. Since there is no difference in perception among users, the functionality at the time of use is expressed, so by analyzing the correlation between the sensory evaluation value and the paper parameter, it is possible to more precisely investigate the paper parameter that greatly affects the tactile sensation.

In addition, when the correlation between the measured value of the above-mentioned friction, the general paper quality parameter, and the above-mentioned sensory evaluation test result in the present invention is analyzed by simple regression analysis and complex regression analysis, the dynamic friction in the present invention can be confirmed. The correlation between the average value of the coefficient and the sensory evaluation value is extremely high, resulting in a specific regression equation for the average value of the sensory evaluation value and the average value of the coefficient of kinetic friction.

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

Therefore, for the non-moisturizing facial paper, a complex regression analysis was carried out to analyze the paper parameters affecting the average value of the dynamic friction coefficient. First, as paper quality parameters of non-moisturizing tissue paper including commercially available products at present, paper thickness, dry tensile strength in longitudinal and transverse directions, wet tensile strength in transverse direction, arithmetic mean thickness and arithmetic mean 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 the facial paper is formed by a large number of fiber networks, and the user of the facial paper uses the fingers to pinch, rub the facial paper, or perform operations such as pressing the periphery of the nose, the present inventors predict that the facial paper A certain displacement in the thickness direction affects the interlaced state of the fibers, which changes the fiber density on the surface and affects friction. Therefore, the displacement in the thickness direction is measured as described above, and the rigidity value is defined.

In addition, when independent variables were selected for the paper parameters again, and the analysis was carried out by the multiple regression analysis using the stepwise method, although the mechanism was not clear, it was found that the above stiffness value can best describe the average value of the dynamic friction coefficient, and obtained A specific regression formula, the paper parameters include the average value of kinetic friction coefficient, moisture content, paper thickness, dry tensile strength in longitudinal and transverse directions, wet tensile strength in transverse direction, arithmetic mean roughness, arithmetic mean undulation, density, Stiffness value. That is, the average value of the kinetic friction coefficient in the present invention can be clearly explained by the stiffness value obtained by the above-mentioned measurement method, as predicted, and it was confirmed that an increase in the stiffness value is effective in decreasing the average value of the kinetic friction coefficient. Furthermore, based on the above regression formula, the present inventors completed the face sheet of the present invention, namely the following face sheet, based on the idea of designing a face sheet within the range of the rigidity value that cannot be achieved in the current face sheet. The stiffness value is 2.0 to 2.8, and the ratio of the stiffness value representing the positive correlation to the average value of the kinetic friction coefficient representing the negative correlation, that is, the stiffness value/average value of the kinetic friction coefficient is 1.73 to 2.11.

In addition, when the above-mentioned rigidity value and the like are produced, the dry tensile strength in the longitudinal direction and the dry tensile strength in the transverse direction can be set to be within the higher ranges in the present invention, in particular, when the facial paper in the present invention is produced. In addition, if the value obtained by multiplying the moisture content and the stiffness value, that is, the moisture content×stiffness value is 12.93 or less, and the element of the moisture content is added, the quality can be more reliably evaluated. Further, it is found that the rigidity value in the present invention can be achieved by adjusting the proportion of raw material pulp, especially NBKP (softwood kraft pulp, long fiber pulp) and LBKP (hardwood kraft pulp (hardwood kraft pulp) pulp), the blending ratio of fluff pulp); adjust the angle of braid when dry crepe paper is provided; further use softener compound, wet paper strength agent, and dry paper strength agent to manufacture tissue paper. In particular, it was found that the rigidity value of the present invention can be easily achieved by adjusting the mesh of a bulky wire used for papermaking. If the mesh of the large papermaking wire is made finer than the mesh used for the usual production of face paper, the face paper having the rigidity value of the present invention can be easily produced. It is considered that this is because the amount of fibers in the surface layer of the paper and the density of the paper layer can be adjusted by adjusting the mesh of the large papermaking wire. [Example]

Next, the Example of the face paper in this invention is described in detail.

The following Table 1 shows the physical property values and sensory evaluation values of the facial papers in the present invention (Examples 1 to 5) and the facial papers (Comparative Examples 1 to 8) of conventional commercial products. Various physical property values and sensory evaluation values were measured according to the above-mentioned measuring method. In addition, Examples 1-5 and Comparative Examples 1-5 are non-moisturizing facial papers which do not contain a moisturizing agent, and Comparative Examples 6-8 are moisturizing facial papers which contain a moisturizing agent.

[Table 1]

The tissue paper in the examples of the present invention was produced in the following manner. First, the sensory evaluation test in this invention was implemented about the non-moisturizing facial paper of Comparative Examples 1-5 and the moisturizing facial paper in Comparative Examples 6-8 which are commercial items. This sensory evaluation test, as described above, is a test in which the order is random and ranked only by the sense of touch, and the scores are evaluated on a scale of 1 to 5 by 30 subjects. That is to say, each case will be evaluated as a score ranging from a minimum of 30 points to a maximum of 150 points. The sensory evaluation value in the table is the score of the sensory evaluation test. Furthermore, regression analysis was performed on the correlation between the sensory evaluation value and the paper quality parameter of each example, and it was confirmed that the average value of the dynamic friction coefficient is the paper quality parameter that can best describe the sensory evaluation value. The average value of the coefficient of kinetic friction in the table is the measured value. Further, regression analysis was performed on the average value of the kinetic friction coefficient and the paper quality parameter having a high correlation, and a high correlation with the stiffness value was confirmed.

In addition, with respect to the moisturizing facial tissues, that is, Comparative Examples 6 to 8, in the same manner as in Comparative Examples 1 to 5, the paper quality parameters correlated with the average value of the coefficient of kinetic friction were subjected to regression analysis, and it was also confirmed that the coefficient of kinetic friction can explain the Paper parameters of moisture content.

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

Examples 1 to 5 in the present invention were first prepared by using a regression formula obtained by regression analysis of the average value of the kinetic friction coefficient and the stiffness value in the above-mentioned Comparative Examples 1 to 5, specifying the prior market A range of high rigidity values that commercial products do not have, and a tissue paper having a rigidity value within this range is produced. Then, it was confirmed that the moisture content of the produced tissue paper was not significantly different from that of Comparative Examples 1 to 5.

Therefore, the following face sheets having a moisture content similar to what is called a non-moisturizing face sheet and having a rigidity value not previously available on the market were used as Examples 1 to 5.

Then, when the measurement of the average value of the kinetic friction coefficient of Examples 1 to 5 and the above-mentioned sensory test evaluation were performed, the average value of the kinetic friction coefficient was generally smaller than that of the comparative example, as expected, and good results were obtained in the sensory evaluation value.

As shown by the tests in the above examples, the facial paper of the present invention becomes a non-moisturizing facial paper with a specific stiffness value and a consumer sensory evaluation value that is unprecedentedly high.

1‧‧‧Measuring device for the average value of kinetic friction coefficient 3‧‧‧Water platform 4‧‧‧Specimen 5‧‧‧Metal plate 6‧‧‧Heavy object 8‧‧‧Laser measuring instrument D‧‧‧Displacement F‧‧‧Vertical load

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

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

Foreign deposit information (please note in the order of deposit country, institution, date and number) None

Claims (2)

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

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