TWI740025B - Facial tissue and manufacturing method of facial tissue products - Google Patents

Abstract

The problem to be solved by the present invention is to provide a facial tissue, which is Multi-layered paper, the face paper can feel "soft and fluffy" and has excellent "softness" and "smoothness".

As a solution, it can be solved by the following tissue paper, which is a three-layered paper, which is characterized in that it contains 6.1% by mass or more and 12.6% by mass or less of glycerin and 1,3-propanediol, and glycerin and 1, The ratio of 3-propanediol is 1:0.07 or more and 1:0.18 or less; the basis weight of each layer when the product is made is 13.4g/m ² or more and 16.0g/m ² or less; the paper thickness of the outer layer is 64μm or more and 76μm or less , The MMD of the outer layer (variation in average friction coefficient) is 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, and the MMD of the middle layer is 5.8 or more and 7.1 or less; the total paper thickness of the three layers is 193 μm or more and 227 μm Below; And, the dry strength of the face paper in the longitudinal direction is 301cN/25mm or more and 414cN/25mm or less, the dry strength in the transverse direction is 89cN/25mm and 125cN/25mm or less, and the wet tensile strength in the transverse direction/horizontal direction The dry tensile strength of is 0.40 or more and 0.54 or less.

Description

Facial tissue and manufacturing method of facial tissue products

The present invention relates to a facial paper, in particular to a facial paper coated with a humectant.

Two-layer facial paper is the mainstream, but in recent years, the demand for three-layer or four-layer and thick facial paper has gradually increased.

Such multi-layered papers are mostly classified as high-quality products with higher product prices, and the facial papers of this product group are especially highly required to have "soft and fluffy feeling" and "smooth surface". "Degree" and "softness".

Moreover, in the case of a multi-layer structure, if the basis weight (weight per unit area) of each layer is increased, the thickness of the paper can be easily thickened by the additive effect of each layer, and a sense of thickness and weight can be expressed. However, if the basis weight of each layer is increased in this way, softness and smoothness cannot be obtained.

In addition, if the base paper is made with a low density during papermaking, a soft and bulky (large volume) base paper can be obtained, but the voids between the fibers of the multilayer structure are easily broken during the lamination process, etc. Sometimes the volume decreases during the production process until the packing. In addition, the density of the base paper is reduced, since the fibers on the surface become sparse, and the smoothness is also easily deteriorated.

[Prior Technical Literature] (Patent Document)

Patent Document 1: JP 2013-188921.

Patent Document 2: Japanese Patent Application Laid-Open No. 5472586.

In order to solve the above-mentioned problem, the present invention provides a facial paper, which is a multi-layered paper, the facial paper can feel "soft and fluffy" and is excellent in "softness" and "smoothness".

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

The first means to solve the above-mentioned problem to be solved is a facial paper, which is a three-layered paper, and the facial paper is characterized in that it contains glycerin and 1,3-propanediol in an amount of 6.1% by mass or more and 12.6% by mass or less, and The ratio of glycerin to 1,3-propanediol is 1:0.07 or more and 1:0.18 or less; the basis weight of each layer when the product is made is 13.4g/m ² or more and 16.0g/m ² or less; the paper thickness of the outer layer is 64μm Above and below 76 μm, the MMD of the outer layer is 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, and the MMD of the middle layer is 5.8 or more and 7.1 or less; The total paper thickness of the three layers is 193 μm or more and 227 μm or less; and The dry strength of the face paper in the longitudinal direction is 301cN/25mm or more and 414cN/25mm or less, the dry strength in the transverse direction is 89cN/25mm and 125cN/25mm or less, and the wet tensile strength in the transverse direction/dry stretch in the transverse direction The tensile strength is 0.40 or more and 0.54 or less.

The second means to solve the above-mentioned problem is a method of manufacturing facial tissue products. The manufacturing method is characterized in that glycerin and 1,3-propanediol contain 6.1% by mass or more and 12.6% by mass when absolutely dry. The method is to apply a moisturizing liquid to the front and back of the laminated sheet; the laminated sheet is made into a three-layer structure composed of an outer base paper and a middle base paper. The drying paper strength (drying strength) of the outer base paper in the longitudinal direction is 182cN /25mm or more and 247cN/25mm or less, the drying paper force in the horizontal direction is 90cN/25mm or more and 129cN/25mm or less, the middle layer base paper has a drying paper force of 96cN/25mm or more and 153cN/25mm in the horizontal direction. The drying paper force in the direction is 49cN/25mm or more and 83cN/25mm or less, and the ratio of the drying paper force of the middle base paper in the longitudinal direction to the drying paper force of the outer base paper in the longitudinal direction is more than 0.47 and less than 0.66, the middle base paper The ratio of the dry paper force in the transverse direction to the dry paper force of the outer base paper in the transverse direction is more than 0.51 and less than 0.67; the moisturizing liquid contains glycerin and 1,3-propanediol, and the ratio of glycerin and 1,3-propanediol The mass ratio is 1:0.07 or more and 1:0.18 or less.

The third means is the manufacturing method of tissue paper products as described in the above-mentioned second means, which includes: a first calendering step, which is performed before applying the moisturizing liquid; and a second calendering step, which is performed before applying the moisturizing liquid. The moisturizing liquid medicine is carried out afterwards; and, the folding processing step, which is carried out by the rotating interfolder (interfolder).

As described above, according to the present invention, it is possible to provide a facial paper, which is a multi-layered paper, the facial paper can feel "soft and fluffy" and is excellent in "softness" and "smoothness".

Fig. 1 is a diagram for explaining the method of measuring the variation of the average friction coefficient (MMD).

Fig. 2 is the first graph showing the results of the test example in the embodiment.

Fig. 3 is a second graph showing the results of the test example in the embodiment.

Hereinafter, embodiments of the present invention will be described.

[Face paper]

The facial paper in this embodiment is a three-layered paper. In other words, it is a sheet of paper that is stacked three sheets into a single draw.

The three-layered paper in this embodiment contains 6.1% by mass or more and 12.6% by mass or less of glycerin and 1,3-propanediol, and the ratio of the glycerin to 1,3-propanediol is 1:0.07 or more and 1:0.18 or less.

The content rate of glycerin and 1,3-propanediol is the ratio in the paper, and is the ratio of the mass of glycerin and 1,3-propanediol to the mass of facial paper in absolute dryness. In addition, the so-called absolute drying is a state in which the tissue is dried until it becomes a constant weight under the conditions of a temperature of 65°C and a humidity of 10%. In addition, the ratio of glycerin to 1,3-propanediol is a mass ratio.

Furthermore, in addition to glycerin and 1,3-propanediol, the facial tissue may contain well-known auxiliary agents. Examples of auxiliary agents include: moisturizing auxiliary components such as sorbitol; hydrophilic polymer gelling agents, surfactants or softness enhancers, which are used to improve the retention of moisture in facial tissues; liquid Oily ingredients such as paraffin, which assist the performance of smoothness; other emulsifiers, preservatives, antifoaming agents, etc., which are used to improve the stabilization and spreadability of moisturizers. In addition, the amount of the ingredients such as the moisturizing auxiliary component and the hydrophilic polymer gelling agent to improve the water retention is set so as not to unduly affect the "softness", "softness" and "surface texture". The degree of smoothness. Specifically, it can be 1.0% by mass or less, preferably 0.6% by mass or less, and more preferably 0.5% by mass or less.

Here, the facial tissue in the present embodiment contains glycerin and 1,3-propanediol, but generally, the liquid medicine previously used for facial tissue only uses glycerin as the main effect component. The moisture absorption effect of glycerin increases the moisture content in the paper, and improves the moistness and softness. However, the previous products containing only glycerin only relied on the moisture absorption effect, so the "moist feeling" and "wet The medicament application sensation such as "degree feel" and "sticky feel" is also high. As a result, it may be difficult to feel the "smoothness" and "softness". The 1,3-propanediol in this embodiment can improve the "softness" by its blending, and the surface will also have a refreshing touch. Therefore, the facial tissue of the present embodiment can improve "softness", "soft fluffy feeling" and "surface smoothness" by the effect of glycerin and the effect of 1,3-propanediol.

In addition, the effect will become significant when the following conditions are added. The conditions are: a three-layer structure; a composition of basis weight, paper thickness, MMD and paper strength; the above-mentioned glycerin and 1,3-propanediol content rate ; And, the mass ratio of glycerin and 1,3-propanediol.

The basis weight of each layer of the facial tissue of this embodiment is 13.4 g/m ² or more and 16.0 g/m ² or less. If the basis weight of each layer is within this range, the "softness", "soft fluffy feeling" and "surface smoothness" will become prominent. In particular, if the basis weight is high, the paper will become hard, and if the basis weight is low, the paper will tend to become soft. Therefore, it is believed that the basis weight has a great influence on the "softness". In addition, the basis weight is a value measured based on the Japanese Industrial Standards JIS P 8124 (1998).

In addition, in the facial paper of this embodiment, the paper thickness of the outer layer is 64 μm or more and 76 μm or less, and the MMD of the outer layer is 5.0 or more and 6.1 or less. Furthermore, the so-called outer layer means the layers located on the two outer surfaces in the three-layer structure. However, the individual outer layers need not have the same composition. Moreover, if the paper thickness and MMD of the outer layer are within this range, the "softness", "soft fluffy feeling" and "surface smoothness" will become prominent. The outer surface of the outer layer constitutes the surface that is in direct contact with the skin.

The outer surface of the outer layer is coated with a chemical liquid, and the chemical liquid penetrates from the outer side to the inside. Therefore, with the moisturizing effect of the liquid medicine and the smooth physical properties of the liquid medicine, the effects of "softness" and "surface smoothness" can be exerted. In addition, because the outer layer contains the chemical liquid, the paper can be smoothed by external pressure on the outer side of the outer layer such as calendering treatment, and the chemical liquid applied on the surface is uniformized to make the surface slippery. Smooth, which can further express the "surface smoothness".

MMD is one of the indicators that express the smoothness of the surface. If it is within this range, sufficient "smoothness" can be felt. Among them, the smoothness of the surface measured based on MMD will be affected by the density of fibers to a certain extent. Moreover, the density of the fiber is also related to the density of the paper, that is, the thickness of the paper and the basis weight. On the other hand, the density of the paper will affect the "softness" and "softness". In other words, it can be considered that in the outer layer, in addition to the basis weight, the MMD and paper thickness are in a specific range, which will complicately affect the mechanical components, and the composition of the glycerin and other chemicals, and the "softness" and "softness" "The fluffy feeling" and "Smoothness of the surface" will become obvious.

On the other hand, in the facial paper of this embodiment, the paper 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. If the paper thickness and MMD of the middle layer are within this range, the "softness", "soft fluffy feel" and "surface smoothness" will become prominent. Although the middle layer does not constitute the surface directly in contact with the skin, as mentioned above, the smoothness of the surface measured by MMD will be affected by the density of the fibers to a certain extent. Therefore, the density of the fibers in the middle layer is also affected by the density of the paper. The density of paper is related to paper thickness and basis weight. In addition, the surface characteristics of the middle layer will also affect the external Layer friction and integrity. Therefore, MMD, basis weight and paper thickness are related to "softness" and "softness". In other words, it can be considered that for the middle layer, in addition to the basis weight, the mechanical components and the composition of glycerin and other chemicals will be complicatedly affected by the MMD and paper thickness within a specific range, so "softness" and "softness" "The fluffy feeling" and "Smoothness of the surface" will become obvious.

In addition, especially the facial tissue of this embodiment, the middle layer is thinner than the outer layer. Compared with the outer layer, the middle layer tends to contain less liquid medicine. Sometimes there is no liquid medicine. Therefore, the middle layer has less influence on the moisturizing effect produced by the liquid medicine, and damage in the thickness direction due to external pressure such as calendering treatment is also less. For example, when treated as a three-layer laminated structure, even after two calendering treatments, the density of the middle-layer base paper can still be maintained low. Therefore, it is possible to express the effect of a soft and fluffy feeling. And it can be considered that the difference in paper thickness between the outer layer and the middle layer, the difference in density caused by the difference in paper thickness, and the difference in moisture content caused by the difference in density, will significantly improve the functionality Effect.

Furthermore, the paper thickness of the outer and middle layers is based on the Japanese Industrial Standards JIS P 8111 (1998). After fully adjusting the humidity of the test piece, under the same conditions, use a dial thickness gauge (dial thickness gauge, Thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Manufacturing Co., Ltd.). 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 move the calibration of the dial thickness gauge to coincide with the zero point. Then, raise the plunger and place the sample on the test bench, then slowly lower the plunger and read the measured value at this time. Determination At this time, it should be noted that the metal plunger terminal (circular plane with a diameter of 10mm) is carried out in a way that it is perpendicular to the paper plane. In addition, the load at the time of the paper thickness measurement was approximately 70 gf. The paper thickness is taken as the average value of the measured value, and the measured value is obtained by performing the measurement 10 times at different parts. The test piece was taken by separating three layers into each layer.

MMD (variation of average friction coefficient (average deviation of friction coefficient)) is a value indicating the degree of variation, and is also an index of smoothness, and the variation is how much variation is from the average coefficient of friction. The smaller the value, the smoother it will be. The measurement is performed using a friction sensor KES-SE manufactured by Kato Tech Co., Ltd. or other similar models. The measurement method, as shown in Figure 1, is implemented according to the following method: While contacting the contact surface of the friction block with a contact pressure of 25g, a tension of 20g/cm has been applied in a specific direction. While measuring the surface of the sample, move 2 cm in approximately the same direction in which the tension is applied at a speed of 0.1 cm/sec. Furthermore, the friction block is set as a 10mm square piano wire sensor that is a standard accessory. The friction zone is composed of 20 piano wires P with a diameter of 0.5 mm adjacent to each other, and has a contact surface formed so that both the length and the width become 10 mm. The contact surface is a part made with a unit bulge, and the unit bulge is formed with 20 piano wires P (curvature radius 0.25 mm) at the tip. In addition, the test piece is handled in the same manner as the paper thickness, and the three layers are separated into each layer and collected. For the measurement of MMD, 10 measurements were made on each side, and the average value was used. Among them, the MMD of the outer layer is measured on the outer surface directly in contact with the skin among the three layers. The measurement is in the vertical and horizontal directions Each was performed 5 times, and the average value of the measured values of the total 10 times was defined as MMD. The MMD of the middle layer is set as the average value of the front and back sides. The measurement was performed 5 times in each of the vertical direction and the horizontal direction of the front and back surfaces, and the average value of the measured values of the total 20 times was defined as MMD.

On the other hand, in the facial paper of this embodiment, the total paper thickness of the three layers is 193 μm or more and 227 μm or less. With a three-layer multi-layer structure, the thickness of the paper is particularly likely to affect the "softness" and "softness". If the thickness of the tissue paper of this embodiment is within this range, the "softness", "soft fluffy feel" and "surface smoothness" become remarkable.

On the other hand, the facial paper of this embodiment has a dry strength in the longitudinal direction of 301 cN/25mm or more and 414 cN/25mm or less. If the dry strength in the longitudinal direction is within this range, the "softness", "soft fluffy feel" and "surface smoothness" will become prominent. In addition, it will be in the range of sufficient strength for durability.

In addition, the dry strength in the horizontal direction is 89 cN/25mm or more and 125 cN/25mm or less. If the dry strength in the horizontal direction is within this range, the "softness", "soft fluffy feel" and "surface smoothness" will become prominent. In addition, it will be in the range of sufficient strength for durability. Furthermore, although there is no conclusion yet, the "horizontal dry tensile strength" affects the overall "touch" functionality, not the individual functionality such as "softness" and "softness". After asking the subject to touch the sample freely, evaluate the quality of facial tissue using comprehensive evaluation criteria such as "touch" instead of specific evaluation criteria such as "softness" and "softness" At the time, it was found that the evaluation of the "touch" and the "dry strength in the horizontal direction" have a certain degree of correlation.

In addition, the tissue paper of the present embodiment has wet tensile strength in the lateral direction/dry tensile strength in the lateral direction of 0.40 or more and 0.54 or less. Furthermore, this value is the measured value obtained by directly measuring the three layers. By having such a difference in strength, the user will feel "strength (strength and peace of mind)" in the use state that changes from dry to wet when blowing the nose. Furthermore, it is difficult to feel the change in the strength of the paper in such a use state, and it will affect the feeling of "smoothness" during use.

In addition, the so-called longitudinal direction of the paper is also referred to as the MD direction, which is the conveying direction during papermaking. The horizontal direction of the paper is also referred to as the CD direction, and is a direction orthogonal to the conveying direction (MD direction) during papermaking.

In addition, the dry tensile strength of the facial paper in the present invention is a value measured based on the Japanese Industrial Standards JIS P 8113, and is a value measured according to the following operation. The test piece used a test piece cut into a width (width) of approximately 25 mm (±0.5 mm) × a length of 150 mm for both the longitudinal direction and the lateral direction of the tissue paper. The facial paper is directly measured in multiple layers. The testing machine is a load cell tensile testing machine TG-200N (model) manufactured by Minebea Co., Ltd., or a similar machine equivalent to this model. In addition, the clamp interval was set to 100 mm, and the stretching speed was set to 100 mm/min. The measurement is carried out according to the following steps: fix both ends of the test piece on the fixture of the testing machine, apply a vertical load to the paper piece, and then read the indicated value (digital value) when the paper breaks (digital value)). Five sets of samples (test pieces) were prepared for each of the longitudinal direction and the lateral direction of the facial paper, and each was measured 5 times, and then the average of the measured values was taken as the dry tensile strength in each direction.

In addition, the wet tensile strength of the facial paper in the present invention is a value measured based on the Japanese Industrial Standards JIS P 8135 (1998), and is a value measured according to the following operation. The test piece used a test piece cut into a width (width) of approximately 25 mm (±0.5 mm) × a length of 150 mm for both the longitudinal direction and the lateral direction of the tissue paper. When the facial paper has multiple layers, it is directly measured with multiple layers. The testing machine is a load cell tensile testing machine TG-200N (model) manufactured by Minebea Co., Ltd., or a similar machine equivalent to this model. In addition, the clamp interval was set to 100 mm, and the stretching speed was set to 50 mm/min. The test piece used a facial tissue that was cured in a dryer at 105°C for 10 minutes. The measurement is carried out according to the following steps: after fixing the two ends of the test piece to the jig of the testing machine, using a flat brush dipped in water, apply water with a width of about 10mm to the center of the test piece horizontally, and then, Immediately apply a load in the up and down direction to the paper sheet, and then read the indicated value (digital value) when the paper breaks. Five sets of samples (test pieces) were prepared for each of the longitudinal direction and the lateral direction of the tissue paper, and each was measured 5 times, and then the average of the measured values was taken as the wet tensile strength in each direction.

The adjustment of dry tensile strength and wet tensile strength can be carried out by adding a dry paper strength enhancer or a wet paper strength enhancer to the paper stock or wet paper. As a dry paper strength enhancer, starch, polyacrylamide, CMC (hydroxymethyl cellulose) or its salt that is hydroxymethyl can be used Base cellulose sodium, hydroxymethyl cellulose calcium, hydroxymethyl cellulose zinc, etc. As the wet paper strength enhancer, polyamide polyamine epichlorohydrin resin, urea resin, acid colloid/melamine resin, heat-crosslinkable coating PAM (polypropylene amide), etc. can be used. Furthermore, when the dry paper strength enhancer is added internally, the added amount relative to the pulp slurry is about 1.0 kg/ton of pulp or less. In addition, the wet paper strength enhancer is desirably a cationic paper strength enhancer, and the added amount of the pulp slurry is about 5.0 to 20.0 kg/ton of pulp.

The fibrous material constituting the facial paper is pulp fiber, and it is expected that NBKP (needle-leaved tree bleached kraft pulp, long-fiber pulp) and LBKP (broad-leaved tree bleached hardwood kraft) which can be used for facial paper pulp), staple fiber pulp). Although recycled pulp can be formulated, it is difficult to express "softness" in recycled pulp, so it is extremely desirable to be composed of NBKP and LBKP of virgin pulp only. As a blending ratio, in terms of mass ratio, it is NBKP: LBKP=25:75~40:60. If it is within this range, the paper strength and "soft fluffy feeling" required for blowing the nose can be easily produced, and the "softness" and "smoothness" can be clearly felt. .

On the other hand, it is desirable that the facial paper in this embodiment has an elongation in the longitudinal direction of 8.5% or more and 12.4% or less. If the elongation is within this range, it will become easier to express sufficient strength and usability when used during blowing of the nose. In addition, the elongation rate is also related to the surface characteristics of the tissue paper with fine crepe lines on the surface, and it will make the surface "smooth" "Degree" is easy to express. In addition, the elongation means a value measured in a tensile test in accordance with Japanese Industrial Standards JIS P 8113 (1998). As a measuring device, the "Universal Tensile Compression Tester TG-200N (model)" manufactured by Minebea Co., Ltd. can be cited. In addition, the elongation rate can be adjusted by the crepe line rate of the base paper during papermaking.

[Method of manufacturing facial tissue]

The facial paper in this embodiment and the product made by packaging the facial paper into a bundle etc. can be manufactured according to the following manufacturing process. First, the papermaking equipment is used to roll up the single-layered paper base paper with crepe lines to form a primary original web roll. Then, three of the primary raw material rolls are set in a ply machine, which is also called a ply machine, and a single layer of continuous sheets are continuously sent out from the respective primary raw material rolls to be laminated into three layers. The ground is slit, etc., and is wound up as a secondary raw material roll. Then, using this secondary raw material roll, a laminated bundle is formed in a folding device or the like also called an interfolder. Then, the laminated bundle is cut into an appropriate size, etc., and then packaged in a carton or the like to make a facial tissue product. In a series of steps in the manufacturing process of making the facial paper into a product, or between the steps, an additional drug application device is provided, so that a moisturizing agent containing glycerin and 1,3-propanediol can be imparted to the base paper of the facial paper by external addition. liquid. Furthermore, the application of the moisturizing liquid medicine to the base paper of the face paper can be performed from one side, but from the point of view that the smoothness of both sides is easy to be uniform, it is desirable to use double-sided coating. In particular, the application of the moisturizing medicinal solution is particularly desirable to be carried out in the state of a laminated continuous sheet formed by laminating the base paper of the facial tissue. For workability, the expectation is The method of applying the medicinal solution to the continuous sheet in the state reduces the strength of the entire layer as a whole, and it is possible to reliably apply the moisturizing medicinal solution to the two outer layers in contact with the skin.

The application of the moisturizing liquid, specifically, can be achieved by assembling roller transfer devices such as flexo presses and gravure presses, spray coatings, etc. in any of the layer production equipment or the cross-folding machine. It can be implemented as a chemical liquid coating device such as a cloth device, or it can be implemented as a device different from a layer production device or a cross-folding machine.

For the moisturizing medicinal solution, for example, an appropriate solvent such as water can be used to adjust the viscosity of glycerin, 1,3-propanediol, and appropriate auxiliary agents to the coating method.

The staggered folding machine that performs folding processing can be a device that performs folding processing by multi-stand type (multi-stand type), rack type, or also known as folded plate type folding plate, or also known as rotating It uses a pair of folding rolls to perform folding processing equipment. However, it is desired to be a rotary-type interfolding machine. When used as a facial paper product with a multilayer structure of three or more layers, although the number of layers is large, the misalignment (offset) of each layer is easy to occur, but compared with other equipment, the rotary cross-folding machine applies the continuous sheet The tension is weak, so the dislocation of each layer is not easy to occur, and the folding quality is easy to be good. Therefore, it is particularly difficult to reduce the "softness" during processing.

The facial paper base paper used when manufacturing the facial paper and its products in the present invention is desirably the following facial paper base paper. The outer base paper constituting the outer layer should have a drying paper force of 182cN/25mm or more in the longitudinal direction and 247cN/25mm or less, and the drying paper force in the horizontal direction is 90cN/25mm or more and 129cN/25mm or less. In addition, the middle layer base paper desirably has a drying paper force of 96 cN/25 mm or more and 153 cN/25 mm in the longitudinal direction, and a drying paper force of 49 cN/25 mm or more and 83 cN/25 mm or less in the lateral direction. Furthermore, the crepe rate of the base paper is expected to be 14 to 16% in the outer base paper and 16 to 18% in the middle base paper. Regarding the difference in paper strength between the outer base paper and the middle base paper, it is only necessary to adjust the amount of paper strength agent added during papermaking, and adjust the basis weight and paper thickness. Furthermore, the dry tensile strength and wet tensile strength of each base paper in the present invention are the same as the dry tensile strength and dry tensile strength of the above-mentioned facial paper, except that the test piece is a single-layer base paper made by papermaking equipment. The wet tensile strength of the tissue paper was measured in the same manner.

When these outer base papers and middle base papers are used, they can be made into a laminated sheet with a three-layer structure, and a moisturizing liquid is applied to the front and back sides. The outer layer is made.

In addition, for the three-layer laminated sheet, it is particularly preferable that the ratio of the drying paper force of the middle layer base paper in the longitudinal direction to the drying paper force of the outer layer base paper in the longitudinal direction is more than 0.47 and less than 0.66, and the middle layer base paper is dried in the horizontal direction. The ratio of the paper force to the dry paper force of the outer base paper in the horizontal direction is more than 0.51 and less than 0.67. Furthermore, the two outer layer base papers do not have to have the same physical composition, but in this case, it is desirable that each outer layer and middle layer still satisfy all the above conditions. That is, it is possible that the middle-layer base paper has the above-mentioned ratio with respect to any outer-layer base paper.

The three-layer structure laminated sheet is provided with a moisturizing medicinal solution containing glycerin and 1,3-propanediol such that glycerin and 1,3-propanediol contain 6.1% by mass or more and 12.6% by mass or less when absolutely dry. And the mass ratio of glycerin to 1,3-propanediol is 1:0.07 or more and 1:0.18 or less. The so-called absolute drying is the state where the finished tissue is dried at a temperature of 65°C and a humidity of 10% until it becomes a constant weight. In addition, the term "contained" means the ratio in the paper, and is the ratio of the mass of glycerin and 1,3-propanediol to the mass of facial paper. To set 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 the moisturizing liquid is 7.5 mass of the base paper. What is necessary is just to provide in the form of% or more and 13.0 mass% or less. However, if glycerin and 1,3-propanediol are to be contained in absolute dryness of 6.1% by mass or more and 12.6% by mass or less, it is not necessary to limit the method and the numerical range. Furthermore, the mass ratio of glycerin to 1,3-propanediol in the moisturizing liquid medicine can be roughly maintained when the product is absolutely dry. In addition, the moisturizing medicinal solution may contain well-known auxiliary agents other than glycerin and 1,3-propanediol within a range that does not hinder the effects of the present invention. Its content is about 5% by mass or less in the liquid medicine based on the total amount of additives. Examples of auxiliary agents include: moisturizing auxiliary components such as sorbitol; hydrophilic polymer gelling agents, surfactants or softness enhancers, which are used to improve the retention of moisture in facial tissues; liquid Oily ingredients such as paraffin wax help the performance of smoothness; other emulsifiers, preservatives, defoamers, etc., are used to improve the stabilization and spreadability of moisturizers. Furthermore, the formulation of ingredients such as moisturizing auxiliary components and hydrophilic polymer gelling agents to improve water retention The amount is set to a level that does not excessively affect the "soft and fluffy feeling", "softness" and "surface smoothness". Specifically, it can be 1.0% by mass or less, preferably 0.6% by mass or less, and more preferably 0.5% by mass or less.

In the manufacturing method of the facial tissue product in this embodiment, the drying paper force of the product can be moderately reduced with respect to the drying paper force of each base paper, and is reduced to a range of approximately 27.6% or more and 42.7% or less in the longitudinal direction, and It is reduced to a range of approximately 58.1% or more and 75.6% or less in the horizontal direction. In addition, the moisture content in the paper becomes constant due to the evaporation or moisture absorption after the moisturizing liquid is applied. As a result, it is possible to produce a "soft and fluffy feeling" that can feel the physical properties and composition of the above-mentioned embodiment. ", and will also noticeably feel the "softness" and "smoothness" of the tissue.

Furthermore, especially when manufacturing the facial paper of this embodiment, as a cross-folding machine, a rotary-type cross-folding machine can be used. In addition, it is desired to perform calendering processing on the laminated sheet. By calendering the laminated sheet, the difference in paper thickness between the outer layer and the middle layer can be easily produced. In addition, especially when performing folding processing using a rotary cross-folding machine, it is desirable to implement it by applying a moisturizing medicinal solution in the cross-folding machine. Furthermore, if the first calendering step is carried out before the moisturizing liquid is applied, and the second calendering step is carried out after the moisturizing liquid is applied, it is easy to obtain a "soft and fluffy feeling". And you can clearly feel the "softness" and "smoothness" of the tissue paper.

Next, with regard to the facial tissues in the present embodiment described above, the effects will be specifically described with the "Examples".

[Example]

The tissue paper of the present invention and the tissue paper different from the present invention were used as samples, and the following sensory tests were carried out using "soft fluffy feeling", "softness" and "surface smoothness" as evaluation items . The physical properties and composition values of individual samples were measured as follows. The physical property values, composition values, and test results of the respective samples are shown in Table 1 and Table 2 below.

[base weigh]

It is measured in accordance with Japanese Industrial Standards JIS P 8124 (1998).

[Paper Thick]

Under the conditions of Japanese Industrial Standards JIS P 8111 (1998), a dial thickness gauge (thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Seisakusho Co., Ltd.) was used to measure in accordance with the above-mentioned thickness measurement method.

[density]

It is calculated based on the total basis weight of the three layers (basis weight of a single layer x 3) and the paper thickness of the three layers. The unit is g/cm ³ and expressed to two decimal places. The three-layer paper thickness can be performed in the same manner as the method of measuring the paper thickness of each layer without peeling off into each layer.

[Dry tensile strength]

Measured in accordance with the tensile test of Japanese Industrial Standards JIS P 8113 (1998).

The test piece used a test piece cut into a width (width) of approximately 25 mm (±0.5 mm) × a length of 150 mm for both the longitudinal direction and the lateral direction of the tissue paper. When the facial paper has multiple layers, it is directly measured with multiple layers. The testing machine is a load cell tensile testing machine TG-200N (model) manufactured by Minebea Co., Ltd. Fixture interval setting Set to 100mm. The measurement is carried out according to the following steps: fix both ends of the test piece on the fixture of the testing machine, apply a vertical load to the paper piece, and then read the indication value (digital value) when the paper breaks. The stretching speed is set to 100 mm/min. For the vertical and horizontal directions of the tissue paper, prepare 5 sets of samples and measure them 5 times each, and then the average of the measured values is used as the dry tensile strength in each direction (for the adjustment of the samples, refer to the Japanese Industrial Standards JIS P 8111 (1998)).

[Wet tensile strength]

Measured in accordance with the tensile test of Japanese Industrial Standards JIS P 8135 (1998).

The test piece used a test piece cut into a width (width) of approximately 25 mm (±0.5 mm) × a length of 150 mm for both the longitudinal direction and the lateral direction of the tissue paper. When the facial paper has multiple layers, it is directly measured with multiple layers. The testing machine is a load cell tensile testing machine TG-200N (model) manufactured by Minebea Co., Ltd. The clamp interval is set to 100mm. The measurement is carried out according to the following steps: after fixing the two ends of the test piece to the fixture of the testing machine, and then using a flat brush moistened with water, apply water with a width of about 10mm to the center of the test piece horizontally, and then immediately A load in the up and down direction was applied to the paper sheet, and then the indicator value (digital value) when the paper was broken was read. The test piece was made by performing Curing Process in a dryer at 105°C for 10 minutes. The stretching speed is set to 50 mm/min. Five sets of samples (test pieces) were prepared for each of the longitudinal direction and the lateral direction of the tissue paper, and each was measured 5 times, and then the average of the measured values was taken as the wet tensile strength in each direction.

[Elongation]

In accordance with the tensile test of Japanese Industrial Standards JIS P 8113 (1998), the load cell tensile tester TG-200N (model) manufactured by Minebea Co., Ltd. is used for measurement in accordance with the sample and measurement procedure in the above dry tensile strength .

[Softness]

The measurement is performed in accordance with the handle-O-meter method, which is based on the Japanese Industrial Standards JIS L 1096 E method. Among them, the test piece was implemented with a size of 100 mm×100 mm and a clearance of 5 mm. The single layer was measured in the vertical direction and the horizontal direction each 5 times, and then the average value of the total 10 times was expressed in units of cN/100mm. Softness is one of the indicators of softness.

[MMD]

The measurement is performed in accordance with the above-mentioned MMD measurement method. That is, the friction sensor KES-SE manufactured by Jiaduo Technology Co., Ltd. was used, and the MMD was measured with a 10 mm square piano wire sensor as a standard accessory. The measurement conditions are implemented as follows: the sample is fixed in a state where a tension of 20 g/cm is applied in a specific direction, and the friction zone is brought into contact with the surface of the measurement sample with a contact pressure of 25 g while being in contact with the sample. The direction to which the tension is applied is approximately the same direction and moves 2 cm at a speed of 0.1 cm/sec. For a single layer, it is measured 5 times in each of the vertical and horizontal directions, and the average value of the total 10 times is expressed in a dimensionless unit. MMD is one of the indicators of smoothness.

[Content of glycerin and 1,3-propanediol]

The content of glycerin and 1,3-propanediol is the ratio in the paper, and is the ratio of the mass of glycerin and 1,3-propanediol to the mass of the sample in absolute dryness. The so-called absolute drying is a state where the tissue is dried until it becomes a constant weight under the conditions of a temperature of 65°C and a humidity of 10%.

[Sensory Evaluation]

The evaluator was set to 30 people, and Comparative Example 1 was used as the reference sample, and compared with the reference sample, the "softness", "softness" and "surface smoothness" were evaluated. "Very excellent" is evaluated as "5", "excellent" is evaluated as "4", "not bad nor bad" is evaluated as "3", and "poor" is evaluated as "2" , When you feel "very bad", it is evaluated as "1", and the average score of each evaluator is calculated as the evaluation value.

In addition, for the "comprehensive evaluation", the evaluation is "5" when the feeling is "good touch and the willingness to buy" is "5", and the evaluation is "4" when the feeling is "good touch and the willingness to buy is high", and when the feeling is It is evaluated as "3" when "the touch is normal and the willingness to buy is neither high nor low", it is evaluated as "2" when it is felt "poor to the touch and the willingness to buy is low", and it is evaluated as "2" when it is "very bad to the touch and almost no willingness to buy" "Is evaluated as "1", and the average score of each evaluator is calculated as the evaluation value. Furthermore, Comparative Example 1 is a commercially available product containing four layers of medicines, and belongs to the category of the highest-grade products with very high market prices.

[Table 1]

[Table 2]

[test results]

Table 1 summarizes the test results of the modified glycerin and 1,3-propanediol content. Table 2 summarizes the test results of the modified ratio and content of glycerin and 1,3-propanediol. In addition, the result obtained by graphing the sensory evaluation of Table 1 is the second figure, and the result obtained by graphing the sensory evaluation of Table 2 is the third graph.

As shown in Table 1 and Figure 2, in Comparative Example 3, Examples 1 to 5, and Comparative Example 4, the ratio of glycerin to 1,3-propanediol was fixed at 1:0.07, but the content of glycerin and 1,3-propanediol different. Comparing these examples, in the examples of the present invention, the content is within the range of 6.1~12.6 mass%. Compared with Comparative Example 1 (reference product), "softness", "smoothness" and "softness" "Is a remarkably excellent result. In addition, although the Example has a three-layer structure, it can still obtain a result superior to that of Comparative Example 1 having a four-layer structure. In addition, Comparative Example 2 which did not contain 1,3-propanediol had a poor result compared to Comparative Example 1, which is the standard paper stock.

Then, as shown in Table 2 and Figure 3, in Comparative Examples 5 to 9, and Examples 6 to 12, the ratio and content of glycerin and 1,3-propanediol are different. Comparing these examples, within the range of the content in the present invention, especially within the range of the ratio of glycerin to 1,3-propanediol in the present invention, compared to Comparative Example 1 (standard product), "soft "Smoothness", "Smoothness" and "Softness" are remarkably excellent results.

From this, it is considered that the structure using the facial tissue of the present invention is remarkably superior in terms of "softness", "smoothness", and "softness".

Claims (3)

A facial paper, which is a three-layered paper, the facial paper is characterized in that 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 to 1,3-propanediol is 1:0.07 Above and 1: 0.18 or less; the basis weight of each layer when the product is made is 13.4g/m ² or more and 16.0g/m ² or less; the paper thickness of the outer layer is 64μm or more and 76μm or less, and the MMD of the outer layer is 5.0 or more and 6.1 Below; the paper thickness of the middle layer is 49μm or more and 59μm or less, the MMD of the middle layer is 5.8 or more and 7.1 or less; the total paper thickness of the three layers is 193μm or more and 227μm or less; and the dry strength of the face paper in the longitudinal direction is 301cN/ 25 mm or more and 414 cN/25 mm or less, the dry strength in the lateral direction is 89 cN/25 mm and 125 cN/25 mm or less, and the wet tensile strength in the lateral direction/the dry tensile strength in the lateral direction is 0.40 or more and 0.54 or less. A method for manufacturing a facial tissue product, the manufacturing method is characterized by: glycerin and 1,3-propanediol contained 6.1% by mass or more and 12.6% by mass or less when absolutely dry, the front and back sides of the laminated sheet are given Pre-moisturizing liquid medicine; the laminated sheet is made into a three-layer structure composed of outer base paper and middle base paper. The drying paper force of the outer base paper in the longitudinal direction is 182cN/25mm or more and 247cN/25mm or less in the horizontal direction. The drying paper force is 90cN/25mm or more and 129cN/25mm or less, the drying paper force in the longitudinal direction of the intermediate base paper is 96cN/25mm or more and 153cN/25mm or less, and the drying paper force in the horizontal direction is 49cN/25mm or more and 83cN/ 25mm or less, and the ratio of the dry paper force of the middle base paper in the longitudinal direction to the dry paper force of the outer base paper in the longitudinal direction is more than 0.47 and less than 0.66. The ratio of the dry paper force in the direction is more than 0.51 and less than 0.67; the moisturizing liquid 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. The method of manufacturing a facial tissue product according to claim 2, which includes: a first calendering step, which is performed before applying the moisturizing liquid; and a second calendering step, which is performed after the moisturizing liquid is applied; And, in the folding processing step, the folding is performed by a rotary interfolding machine.

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