JP2005113368A - Sanitary paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sanitary paper which, in use, has excellent touch such as moist feel and soft touch and hardly causes irritation and reddening of the skin even when the paper is frequently brought into contact with the skin. <P>SOLUTION: The sanitary paper has 10-35 g/m<SP>2</SP>unit weight per one ply and 5.4-6.4 m<SP>2</SP>/100 softness per unit of unit weight, contains chemicals in pulp-based paper, is moisture-conditioned on the basis of the conditions defined by JIS P8111, has 9.50-15.00% moisture percentage measured according to JIS P8127 and ≤7.0 mm oil absorbency measured, following Klemm water absorbency test defined by JIS P8141, on the basis of standard conditions defined by JIS P8111 after substituting water with a commercial salad oil. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to sanitary paper such as tissue paper.

  Recently, so-called high-quality tissue paper that has been softened by adding chemicals such as softeners has been on the market, and it has become popular as it is difficult to irritate the skin even if you rub the nose repeatedly, or it is difficult to make the nose red. Yes.

  However, the conventional medicinal solution-containing sanitary paper has not been sufficiently effective in preventing skin irritation and redness of the skin.

  That is, as a result of intensive studies by the present inventors, conventional chemical-containing sanitary paper has the effect of removing sebum from the surface when it comes into contact with the skin stratum corneum surface. Therefore, when such sanitary paper is frequently brought into contact with the same part of the skin, the sebum is first removed by the sanitary paper, and then the moisture in the stratum corneum is removed from the point where the sebum is lost. As a result, the skin becomes rough and red.

  Therefore, the main problem of the present invention is to provide a sanitary paper that is excellent in touch such as moist feeling and softness when used, and that does not easily become irritated and does not become red easily even if it is in contact with the skin frequently. It is in.

<Invention of Claim 1>
Basis weight per ply is the 10~35g / m ^2, and softness of the unit rice per tsubo is a 5.4~6.4m ^2/100,
Contains chemicals in pulp base paper,
Moisture was adjusted under conditions specified in JIS P 8111, and the moisture content measured by JIS P 8127 was 9.50 to 15.00%.
According to the Krem water absorption test specified in JIS P 8141, water is replaced with commercially available salad oil, and the oil absorption measured under standard conditions specified in JIS P 8111 is 7.0 mm or less. Sanitary paper.

  Here, more specifically, the softness referred to in the present invention means “softness” represents a resistance value (average value in the vertical and horizontal directions) when a 10 cm wide paper is pushed into a gap having a width of 5.0 mm by a terminal. It is. In addition, US tsubo is a measured value based on JIS.

  The oil absorbency of the present invention is measured under standard conditions specified in JIS P 8111 by replacing water with commercially available salad oil (manufactured by Nissin Oil Co., Ltd.) according to the Krem water absorbency test specified in JIS P 8141. . However, the measurement time is 60 seconds, and the paper flow is in the vertical direction (flow direction in the production line). That is, the dimension of the test piece is 60 seconds in the vertical direction, the lower end of the paper is dipped in salad oil, the height at which the salad oil rising after 60 seconds rises is measured, and the average value of 10 test pieces is obtained.

(Function and effect)
Conventional commercial products have a large softness value. By setting the softness in the range of such a small value according to the present invention, a sanitary paper having excellent softness can be obtained.

  Furthermore, the conventional commercial product has a low moisture content. On the other hand, when the moisture content is increased in accordance with the present invention, it is excellent in touchability mainly with a moist feeling. In particular, even when there is little sebum on the surface of the stratum corneum in contact with the skin, it is difficult to take away moisture in the stratum corneum. Therefore, even if it contacts with skin frequently, it is hard to become rough and red.

  Moreover, according to the present invention, by sufficiently reducing the oil absorption, the sanitary paper does not easily take the sebum on the surface of the stratum corneum, and the moisture in the stratum corneum is protected by the sebum, resulting in rough or red skin. It becomes difficult.

<Invention of Claim 2>
The chemical solution contains 60 to 100% by weight of an active ingredient, and 95.5 to 97.0% by weight of a humectant and 3.0 to 4.5% by weight of a softening agent in the active ingredient,
The chemical solution has a pH of 5.0 to 6.0,
The softening agent is selected from an anionic surfactant, a cationic surfactant, a nonionic surfactant and a zwitterionic surfactant,
The sanitary paper according to claim 1, wherein the chemical solution is contained in an amount of 46.0 to 160.0 mg / cm ³ per unit volume of the base paper.

(Function and effect)
As a chemical | medical solution, a softening agent and a moisturizer are included. Further, when the pH is 5.0 to 6.0, more preferably 5.3 to 5.7, the skin does not become alkaline even if it is brought into contact with the skin. The rough skin due to the influence of the chemical solution pH can be effectively prevented.

<Invention of Claim 3>
The sanitary paper according to claim 1 or 2, wherein the chemical solution further contains vitamin E and vitamin C.

(Function and effect)
Vitamin C, vitamin E, or the like is used as an antioxidant used in the chemical solution. In this case, effects such as moisture retention of sanitary paper and prevention of skin oxidation are exhibited. In particular, when both vitamins C and E are used, vitamin C works as a supplement to vitamin E, and the antioxidant action of vitamin E can be maintained for a longer time. Vitamin E is a component with a strong reducing power and has an antioxidative action that eliminates active oxygen and free radicals and prevents the generation of lipid peroxide. Therefore, vitamin E functions as a chemical solution stabilizer and, when applied to the skin of a person who uses sanitary paper, exhibits the effect of preventing the sebum of the skin and the effect of promoting blood circulation. There is also a moisturizing function. On the other hand, vitamin C, like vitamin E, has a sebum antioxidant effect. Vitamin C has the action of reducing vitamin E, so if both vitamin C and E are used, vitamin C works as an auxiliary to vitamin E, reducing vitamin E oxidized by active oxygen, etc. The effect of maintaining the strong anti-oxidant effect of sebum is exhibited.

  According to the present invention, in use, it is excellent in touch such as moist feeling and softness, and it becomes a sanitary paper that does not easily become irritated and does not become red easily even if it is brought into contact with the skin frequently.

Hereinafter, embodiments of the present invention will be described in detail.
<Requirements for physical properties of sanitary paper>
The sanitary paper of the present invention is conditioned under the conditions specified in JIS P 8111, and the moisture content measured by JIS P 8127 is preferably 9.50 to 15.00%, particularly 9.50 to 12.00%. is there.

  As described above, the sanitary paper of the present invention contains a chemical liquid containing a softening agent and a humectant in a pulp base paper.

The oil absorption is preferably 7.0 mm or less, particularly 4.0 to 6.5. The chemical solution was applied to the base paper so that the chemical content per paper volume of the base paper was 46.0 to 160.0 mg / cm ³ , particularly 48.0 to 60.0 mg / cm ³ Sanitary paper can be manufactured by using a chemical solution application method.

The chemical solution content measured in the longitudinal direction of the paper was such that about 10 g of the sample was kept on a warm bath with ethanol / benzene solvent (volume ratio 1: 1) 120-140 ml by a Soxhlet extractor. Heat and extract for 4 hours. Thereafter, the sample is left in a constant temperature dryer at 150 ± 2 ° C. for 90 minutes, the weight of the extract is measured, and the ratio is obtained by dividing by the absolute dry weight of the sample. The chemical liquid application amount is calculated by the following formula.
Chemical solution application amount = US tsubo (per ply) x 2 (ply) x chemical solution content (%) x 1000 ÷ (volume per unit area) However, the volume per unit area is the paper thickness (μm) ÷ 10000 x 100 × 100.
If the chemical content exceeds 160.0 mg / cm ³ , it becomes a sanitary paper with a sticky feeling, which gives the user unpleasant feeling.

According to JIS P 8113, the tensile strength in the machine direction during drying is 60 to 160 N / m, and the tensile strength in the transverse direction during drying is 20 to 60 N / m. The aspect ratio of the tensile strength in the longitudinal direction to the tensile strength in the direction is set to 1.5 to 5.0.
The wet tensile strength is preferably 30.0 to 60.0 N / m in the vertical direction and 10.0 to 30.0 N / m in the horizontal direction.

The bending hardness B measured by a pure bending tester is preferably 0.0040 to 0.0060 g · cm ² / cm.
Here, the bending hardness B refers to a paper sample having a width of 20 cm, the chuck interval is 1 cm, and one side is bent to a maximum curvature of 2.5 cm ⁻¹ by pure bending that always keeps an arc, and then returned to its original state. The relationship between the curvature and the bending moment when it is bent back to the curvature of -2.5 cm ^{-1 and} then returned to the original ^value is expressed by an average inclination between the curvatures of 0.5 and 1.5 cm ^-1. . More specifically, as shown in FIG. 1, using a “automated pure bending tester KESFB2-AUTO-A” manufactured by Kato Tech Co., Ltd., a paper sample having a width of 20 cm has a chuck interval of 1 cm, and one of them always maintains an arc. pure bending by a return after bending the front side up to maximum curvature 2.5 cm ^-1 based on the next definitive when undone after bending the back up of curvature -2.5 cm ^-1, the relationship between the bending moment and the curvature To evaluate. This relationship is obtained as a value on the hysteresis curve shown in FIG. 2 and is an average value (B average) of the bending hardness B expressed by an average inclination between the curvatures of 0.5 and 1.5 cm ⁻¹ (B average). Is the bending hardness B of the present invention. The larger the average value (B average) of the bending hardness B, the harder it is to bend.
In the conventional commercial product, the bending hardness B shows a large value. On the other hand, when the bending hardness B is set to a small value according to the present invention, it is excellent in touchability mainly centering on softness. Further, when the pulp base paper is impregnated with a moisturizing agent and a softening agent, there is an advantage that a moist feeling and a soft feeling are promoted.

<Base material paper>
As the base paper, known papers can be used without any problem, but the NBKP blending ratio in the pulp raw material is 30.0 to 80.0% (JIS P 8120), particularly 50.0 to 70.0. Some are preferred. The rice tsubo is preferably 10.0 to 35.0 g / cm ^{2 according} to JIS P 8124. The paper thickness is desirably 130 to 200 μm with 2 plies. The crepe rate is desirably 15.0 to 26.0.

<Chemical solution>
As the chemical solution, known ones can be used without any problems, but particularly those having a pH of 5.0 to 6.0, more preferably 5.3 to 5.7, which is weakly acidic, Even if it is brought into contact with the skin, the skin does not become alkaline, and rough skin due to the influence of the chemical pH can be effectively prevented. The pH can be adjusted by adding an acidic or basic pH adjuster to the chemical solution. When the chemical solution is strongly acidic, an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution can be used. In the case of neutral / alkaline, citric acid, malic acid and lactic acid can be used.

  The components of the chemical solution in the present invention can be appropriately selected from humectants, softeners and antioxidants, but it is particularly preferable to contain them all. As the humectant, polyhydric alcohol, sorbitol, glycol solvent can be used preferably. As a result, the moisture of the sanitary paper becomes sufficient. Collagen can be used together with these, and in this case, the effect of moisturizing the skin is also exhibited.

  As the softener, an anionic surfactant, a nonionic surfactant, a cationic surfactant, and a zwitterionic surfactant can be appropriately selected and used, and an anionic surfactant is particularly preferable. . When an anionic surfactant is used, the stiffness (bending hardness) of the base paper can be reduced to the above-described range, and thus a moist feeling by the moisturizing agent and a soft feeling by the softening agent can be promoted. As the anionic surfactant, carboxylate, sulfonate, sulfate ester, phosphate ester, and the like can be used. An alkyl phosphate ester salt is particularly preferable.

  Examples of nonionic surfactants include sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, and polyhydric alcohol monofatty acid esters such as N- (3- Oleiroshiki-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene monolaurate, polyoxyethylene cetyl ether Polyoxyethylene lauryl ether can be used.

  As the cationic surfactant, a quaternary ammonium salt, an amine salt, an amine, or the like can be used. In addition, as the zwitterionic surfactant, an aliphatic derivative of a secondary or tertiary amine containing carboxy, sulfonate, sulfate, an aliphatic derivative of a heterocyclic secondary or tertiary amine, or the like is used. I can do it.

  On the other hand, vitamin C, vitamin E, etc. can be used as an antioxidant used in the chemical solution of the present invention. In this case, effects such as moisture retention of sanitary paper and prevention of skin oxidation are exhibited. In particular, when both vitamins C and E are used, vitamin C works as a supplement to vitamin E, and the antioxidant action of vitamin E can be maintained for a longer time. Vitamin E is a component with a strong reducing power and has an antioxidative action that eliminates active oxygen and free radicals and prevents the generation of lipid peroxide. Therefore, vitamin E functions as a chemical solution stabilizer and, when applied to the skin of a person who uses sanitary paper, exhibits the effect of preventing the sebum of the skin and the effect of promoting blood circulation. There is also a moisturizing function. On the other hand, vitamin C, like vitamin E, has a sebum antioxidant effect. Vitamin C has the action of reducing vitamin E, so if both vitamin C and E are used, vitamin C works as an auxiliary to vitamin E, reducing vitamin E oxidized by active oxygen, etc. The effect of maintaining the strong anti-oxidant effect of sebum is exhibited.

  Collagen can also be added as necessary. In this case, a moisturizing effect that moisturizes the skin is exhibited, and a moisturizing effect is also exerted on thin paper. The amount of collagen added can be determined as appropriate, but is preferably the same level as the antioxidant from the viewpoint of cost effectiveness.

<Combination of chemical solution>
A suitable formulation of the chemical solution when using the above-described components is shown below.
Active ingredient 60-100% by weight (especially 80-100% by weight)
Moisturizer 95-100 wt% (especially 95.5-97.0 wt%)
Softener 0-5 wt% (especially 3.0-4.5 wt%)
Antioxidant 0.000001-0.001% by weight
・ Moisture 0-40% by weight

<Other physical properties>
Compression properties: Tm, the To and (To-Tm) in the test of the compression property, using a Kato Tech Co., Ltd. "handy compression tester KES-G5", between steel plates with circular plane of compression area 2 cm ² The compression characteristics when a paper sample is compressed to a maximum compression load of 50 g / cm ² and returned to its original state are evaluated. The compression characteristics shown at this time can be expressed as the relationship shown in FIG. The thickness Tm at a load of 50 g / cm ² is preferably 0.160 mm or more per ply. The thickness To at a load of 0.5 g / cm ² is desirably 0.350 mm or less for one ply. Displacement difference of the thickness Tm of the thickness To and 50 g / cm ² under a load of ^{0.5g / cm 2 (To-Tm} ) , the following is desirable 0.200mm in one ply. Furthermore, Tm / (To-Tm) is desirably 0.800 to 1.500.

Surface characteristics: MMD and MIU For the test of the surface characteristics, “Friction Tester KESSE” manufactured by Kato Tech Co., Ltd. can be used. In the measurement, as shown in FIG. 4, a friction element having a cross-sectional diameter of 0.5 mm and a contact surface length of 5 mm is moved while contacting a paper sample with a contact pressure of 10 g. The friction coefficient is measured when the paper sample is moved 2 cm at a speed of 0.1 cm / sec while applying a tension of 20 g / cm to the paper direction.
The average deviation of the friction coefficient (variation of the surface thickness when the friction element is moved, that is, a value obtained by dividing the friction coefficient by the friction distance (movement distance = 2 cm)) MMD is preferably 0.0180 to 0.0250. The average friction coefficient MIU of paper is preferably 0.4000 to 0.5000.

<Use of sanitary paper>
The sanitary paper of the present invention is suitable for use for rubbing the skin, such as tissue paper and toilet paper, but can also be used for other purposes.

As shown in Tables 1 and 2, various physical properties were measured and calculated, and sensory evaluation was performed on various tissue papers (Examples according to the present invention, conventional products, and commercial products A to D). The measurement / calculation / evaluation method is shown below. The physical properties were measured under the conditions specified in JIS P8111.
(1) Measurement of US tsubo (1 ply): JIS P 8124
(2) Measurement of paper thickness (2-ply): The paper thickness is measured using an Ozaki Dial Thickness Gauge “PEACOCK G type” under the conditions of JIS P8111. Specifically, confirm that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to adjust the zero point, and then Then, raise the plunger and place the sample (tissue paper) on the test table, slowly lower the plunger and read the gauge at that time. At this time, only the plunger is placed. In addition, a measurement is performed by 1 sheet and it is set as the average value of 10 times.
(3) Density calculation: US tsubo × 2 / (paper thickness / 10000 × 100 × 100)
(4) Chemical solution content: supra
(5) Chemical content per unit volume of paper:
(6) Oil absorption: The above
(7) NBKP content: JIS P 8120
(8) Crepe rate: ((peripheral speed of the dryer during papermaking) − (peripheral speed of the reel)) / (peripheral speed of the dryer during papermaking) × 100
(9) Tensile strength: JIS P 8113
(10) Tensile strength aspect ratio: Longitudinal tensile strength / lateral tensile strength
(11) Elongation: Elongation at break in the longitudinal tensile test
(12) Moisture content: JIS P 8127
(13) Softness: Handle ohm meter
(14) Bending hardness B: Pure bending tester (“Automated Pure Bending Tester KESFB2-AUTO-A” manufactured by Kato Tech Co., Ltd.). The higher the bending hardness B, the harder it is to bend.
(15) To, Tm: Compression tester ("Handy compression tester KES-G5" manufactured by Kato Tech). In addition, it shows that it is soft paper quality, so that To-Tm is large.
(16) Average friction coefficient MIU, friction distance MMD: Surface property tester (“Friction Tester KESSE” manufactured by Kato Tech Co., Ltd.).
(17) Sensory evaluation: Evaluate whether or not the nose hurts easily when biting the nose a predetermined number of times. Average value by 20 men and women.

  As shown in Tables 1 to 3, the Examples according to the present invention have a low oil absorption and are difficult to absorb the oil as compared with the other examples, and thus excellent results were obtained in sensory evaluation.

It is explanatory drawing of a bending hardness test method. It is a relationship diagram between a bending moment and a curvature. It is a related figure of a compression characteristic. It is explanatory drawing of the test method of a surface characteristic.

Claims (3)

Basis weight per ply is the 10~35g / m ^2, and softness of the unit rice per tsubo is a 5.4~6.4m ^2/100,
Contains chemicals in pulp base paper,
Moisture was adjusted under conditions specified in JIS P 8111, and the moisture content measured by JIS P 8127 was 9.50 to 15.00%.
According to the Krem water absorption test specified in JIS P 8141, water is replaced with commercially available salad oil, and the oil absorption measured under standard conditions specified in JIS P 8111 is 7.0 mm or less. Sanitary paper. The chemical solution contains 60 to 100% by weight of an active ingredient, and 95.5 to 97.0% by weight of a humectant and 3.0 to 4.5% by weight of a softening agent in the active ingredient,
The chemical solution has a pH of 5.0 to 6.0,
The softening agent is selected from an anionic surfactant, a cationic surfactant, a nonionic surfactant and a zwitterionic surfactant,
The sanitary paper according to claim 1, wherein the chemical solution is contained in an amount of 46.0 to 160.0 mg / cm ³ per unit volume of the base paper.   The sanitary paper according to claim 1 or 2, wherein the chemical solution further contains vitamin E and vitamin C.

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