WO2017043388A1 - Wiping paper for personal use - Google Patents

Abstract

This wiping paper for personal use has a laminated body in which 4-6 sheets of dry crepe paper are superimposed and joined together, the basis weight per sheet being 13 g/m² to 16 g/m². The water-absorption rate at which water is absorbed in 0.5 seconds under a dry condition of the laminated body is 180-250 g/m², and the water-absorption rate at which water is absorbed in 0.5 seconds under a wet condition is 160-210 g/m². The average deviation of the average coefficient of friction of the laminated body under the wet condition is 13.0-15.0.

Description

Interpersonal wipes

The present invention relates to a personal wipe.

Traditionally, cloth towels have been used for finishing wiping after cleaning the genital area of care recipients in nursing facilities. Recently, however, disposable non-woven wipers have been widely used to reduce washing time and prevent infectious diseases due to an increase in the population requiring care, a shortage of caregivers, and improvement in the hygienic environment at nursing facilities. It is used (for example, refer to Patent Document 1).

Japanese Patent No. 5326104

However, most non-woven wipers mainly contain petroleum-derived chemical fibers. Due to the use of fossil fuels and the fact that they are difficult to disassemble during disposal and are not environmentally friendly, cheap and environmentally friendly paper wipers have been used instead of non-woven wipers.

On the other hand, conventional paper wipers are more susceptible to tearing when wet than non-woven wipers. Therefore, the thickness of the paper wiper is increased to make it difficult to tear, and the texture is stiff and uncomfortable. For this reason, the conventional paper wiper, for example, when washing the pubic area when changing diapers, wipes and rinses dirt, urine, etc. adhering to the delicate but complex ridges and anus and around the anus It was unsuitable for use in wiping off moisture, such as rubbing and rough skin.

Such a paper wiper could be used as a general cleaning wiper, but it had a poor touch and poor water absorption at the time of wiping. There was a problem of being. Therefore, there has been a demand for a paper product that has both soft softness and moderate water absorption suitable for wiping and strength when wet.

An object of the present invention is to provide a wiping paper for personal use that has good instantaneous water absorption and can be suitably used in dry and wet conditions.

The interpersonal wipe according to one embodiment of the present invention includes a stack in which four to six sheets of dry crepe paper having a basis weight of 13 g / m ² or more and 16 g / m ² or less are overlapped and joined. The stack has a water absorption of 180 to 250 g / m ² in 0.5 seconds under dry conditions and a water absorption of 160 to 210 g / m ² in 0.5 seconds under wet conditions. The average deviation of the coefficient of friction under the wet condition of the stack is 13.0 to 15.0.

According to one aspect of the present invention, it can be suitably used in dry conditions or wet conditions, has good touch when wiping with people, moderate instantaneous water absorption suitable for wiping, strength with water absorption when wiping Excellent interpersonal wipes are obtained.

It is a perspective view which shows the wiping paper for people of this embodiment. It is explanatory drawing which expands and shows the cross section of the wiping paper for people.

Hereinafter, specific aspects of the interpersonal wipe according to the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

FIG. 1 is a perspective view showing a personal wipe 10, and FIG. 2 is a cross-sectional view of the personal wipe 10.

The interpersonal wipe 10 is a dry crepe paper made by a wet paper machine using 100% coniferous or hardwood chemical pulp (for example, NBKP (softwood bleached kraft pulp), LBKP (hardwood bleached kraft pulp)) as raw pulp. Is a paper wiper made of a stack of four to six sheets of dry crepe paper 1 having a basis weight of 13 g / m ² or more and 16 g / m ² or less.

If the rice tsubo is less than the above value, the paper will be less than the strength required for wiping, and therefore tearing is likely to occur, and since there is no waist, the wiping operation cannot be relied upon. When the above numerical value is exceeded, the strength is increased, but the creaking due to the thickness occurs, resulting in a paper with poor skin contact.

Also, when the number of stacked sheets is less than the above value, the amount of water that can be retained between the papers is limited, so that the amount of water absorption obtained by stacking the papers decreases. When the above numerical value is exceeded, the thickness is increased by increasing the number of paper layers, and the paper becomes difficult to handle by wiping off the details.

The dry crepe paper 1 constituting the wiping paper 10 for personal use, for example, is a wet type such as a known circular net Yankee paper machine, long net Yankee paper machine using raw pulp containing NBKP having a beating degree of 650 cc or more and 720 cc or less. It can be formed by papermaking technology. In the papermaking of the dry crepe paper 1, papermaking chemicals such as a wet paper strength agent, a softening agent, and a dispersing agent may be appropriately used.

The wet paper strength agent is added to 10.0 to 24.0 kg / ton, preferably 12.0 to 20.0 kg / ton, more preferably 14.0 to 18.0 kg / ton, with respect to the paper raw material (dry). To do. If it is less than 10.0 kg / ton, the strength when wet becomes insufficient and it is easy to tear. If it exceeds 24.0 kg / ton, the paper becomes hard and stiff and unsuitable as a personal wiper.

As the wet paper strength agent, urea formaldehyde resin, melamine formaldehyde resin, polyamide polyamine epichlorohydrin (PAE), polyvinylamine (PVAm) and the like are used, and polyamide polyamine epichlorohydrin resin is preferable.

The softening agent is not added or is 0.01 to 2.0 kg / ton, preferably 0.1 to 1.0 kg / ton, more preferably 0.5 to 1.0 kg / ton with respect to the paper raw material (dry). Add tons.

The softening agent imparting flexibility can be appropriately selected from anionic surfactants, nonionic surfactants, cationic surfactants and zwitterionic surfactants.

As the anionic surfactant, a carboxylate salt, a sulfonate salt, a sulfate ester salt, a phosphate ester salt, or the like can be used. An alkyl phosphate ester salt is particularly preferable.

Examples of the nonionic surfactant 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- Oleirosoxy-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. be able to.

For the dry crepe paper mainly composed of the conifer chemical pulp according to the embodiment of the present invention, the softening agent of the fatty acid ester-based zwitterionic surfactant imparting excellent texture with little decrease in paper strength is most suitable. .

For example, as shown in FIGS. 1 and 2, the interpersonal wipe 10 of the present embodiment has four dry crepe papers 1 overlapped by ply processing using pin embossing.

The pin embossing is performed by pressure bonding the raw material fibers so as not to penetrate. The shape of the pin emboss apex is a circle, ellipse, quadrangle, polygon such as a hexagon, etc., and the area of the pin emboss apex is preferably 1.0 to 10.0 mm ² , and the interval between the pin emboss apexes is a lattice shape Are preferably arranged at intervals of 3.0 to 10.0 mm. In addition, as shown in FIG. 2, the embossing which pushes toward the dry crepe paper 1 side used as the back from the dry crepe paper 1 side used as the table | surface of the personal wipe 10 is performed, and the four dry crepe papers 1 are crimped | compressed. Has been.

All test evaluations such as the amount of water absorption and the speed of water absorption were conducted under the standard conditions of JIS S8111.

The water absorption obtained by immersing the wipe 10 for 0.5 seconds under dry conditions for 0.5 seconds is 180 to 250 [g / m ² ], and the water absorption obtained by immersing for 0.5 seconds under wet conditions is 160 to 210 [g / m ² ]. m ² ]. When the value is less than the above value, moisture tends to remain on the skin when wiping off, paper sticking to the skin occurs, and tearing of the paper tends to occur. When the above numerical value is exceeded, when moisture other than moisture, for example, sticky filth, is wiped, moisture is absorbed first, so that appropriate moisture does not remain on the skin, and filth is difficult to wipe off.

Moreover, the water absorption speed according to JIS S 3104 of the personal wipe 10 was 0.3 to 1.5 [seconds / 300 μL] (see Tables 1A to 1C). When the value is less than the above value, moisture is first absorbed when wiping away anything other than moisture, such as sticky filth, so that moderate moisture does not remain on the skin and it is difficult to wipe off filth. When the above numerical value is exceeded, when wiping off, moisture tends to remain on the skin, paper sticking to the skin occurs, and paper tearing or the like easily occurs.

Further, this personal wipe 10 had a softness of 0.5 to 0.8 cN at a clearance of 20 mm, which will be described later. If it is less than the above value, there is no waist and it does not rely on wiping. If it exceeds the above value, it is strong and feels irritated during wiping.

On the other hand, in the case of non-woven wipers having the same thickness (see Table 3, Reference Examples 1 to 3), the water absorption is 90 to 175 [g / m ² ] and the water absorption speed is 2.7 to Since it is 5.1 [sec / 300 μL], the interpersonal wipe 10 of the present embodiment is a paper wiper that has a high water absorption speed and a high water absorption per unit area, and has a good water absorption performance. I know that there is.

Further, the MMD (variation of average friction coefficient (μ, MIU)) of the personal wipe 10 under wet conditions is 13.0 to 15.0.

Specifically, the MMD (variation in average friction coefficient) of the interpersonal wipe 10 under dry conditions was 10.2 to 14.6 on the front side. Further, the MMD (change in average friction coefficient) under wet conditions was 13.2 to 13.7 on the front side (see Tables 1A to 1C). If the value is less than the above, the paper will be smooth to the touch, but since there are no moderate irregularities, the amount of moisture retained in the irregularities will decrease, and the ability to scrape semi-solids other than moisture will be inferior. Not suitable for taking. When the above numerical value is exceeded, the paper has irregularities on the surface, and therefore, the paper becomes poor on the skin due to surface roughness. Here, the wet condition is a value measured in a state in which 1 g of water is evenly applied to the sheet surface by spraying on the sheet folded surface (about 270 to 320 cm ² ) and left standing indoors for 10 minutes.

In contrast, in the case of a nonwoven wiper having the same thickness (see Tables 3A to 3C, reference examples (comparative examples) 1 to 3) (no difference between the front and back of the nonwoven wiper), MMD (average friction coefficient) under dry conditions ) To 7.4 to 19.7, and MMD (variation of average friction coefficient) under wet conditions is 12.6 to 17.3. Therefore, it can be seen that the interpersonal wipe 10 of the present embodiment has a touch under dry and wet conditions that is comparable to a non-woven wiper.

Here, MMD is the fluctuation of the average friction coefficient. MMD is one of the indices of smoothness. The smaller the numerical value, the smoother, and the larger the numerical value, the less smooth.

As a method for measuring the MMD value, a contact pressure of 25 g is applied to the surface of the paper which is a measurement sample to which a tension of 20 g / cm is applied in a predetermined direction on the contact surface of a 10 mm square friction element wound with a piano wire. While being contacted with each other, it is moved by 2 cm at a speed of 0.1 cm / s in the same direction as the direction in which the tension is applied. At this time, the friction coefficient was measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.), and 100 times the value obtained by dividing the friction coefficient by the friction distance (movement distance = 2 cm) was defined as the MMD value. did.

The friction element has 20 piano wires P having a diameter of 0.5 mm adjacent to each other and has a contact surface formed so that the length and width are both 10 mm. The contact surface is formed with a unit bulging portion whose tip is formed of 20 piano wires P (curvature radius 0.25 mm).

Next, an example sample and a comparative example sample of wiping paper for personal use are prepared, and the results of performance evaluation are shown.

Tables 1A to 1C show the evaluation results regarding Examples 1 to 3 of the personal wipe 10. The evaluation results for Comparative Examples 1 to 7 are shown in Tables 1A to 1C and Tables 2A to 2C.

Table 3 shows the evaluation results for Reference Examples (Comparative Examples) 1 to 3. Reference examples (comparative examples) 1 to 3 are data on nonwoven wipers.
(Physical property test and sensory evaluation results by actual use)
In Examples 1 to 3, a dry crepe paper having a basis weight of 13.7 [g / m ² ] was prepared using NBKP 100% as a raw material pulp, and 4 to 6 sheets of each were laminated and ply joined for personal use. Wipe paper.

Dry crepe paper is folded into four. Sensory evaluation by actual use was performed in the product state (four-fold state).

In Comparative Examples 1 to 3, dry crepe paper having a basis weight of 13.7 [g / m ² ] was prepared using NBKP 100% similar to that in Examples 1 to 3 as raw material pulp, and the dry crepe paper Is a sample of interpersonal wipes in which 2 sheets, 3 sheets, and 7 sheets are superposed.

In Comparative Examples 4 to 7, dry crepe paper having a basis weight of 19.2 [g / m ² ] of dry crepe paper was prepared using raw pulp of NBKP 80% and LBKP 20%. Samples of interpersonal wipes in which three, four, five, and six sheets of paper are superimposed.

The softness of the wiping paper for personal use was measured by a measuring method based on the handle ohm method of JIS L 1096.

Specifically, the measurement was performed with a handle ohmmeter based on the principle of measuring the amount of work required to push a paper sheet (personal wipe paper) having a size of 100 mm × 100 mm into a predetermined gap (20 mm). Measurement was performed three times in each of the vertical direction and the horizontal direction, and the average value of each was calculated.

In addition, the obtained vertical and horizontal average values were calculated by applying the following equation, and the obtained numerical values were rounded to the first decimal place.

Softness [cN] = (vertical average value (cN) × horizontal average value (cN)) ^1/2
The water absorption speed of the personal wipes was measured by a measurement method based on the former JIS S 3104.

Specifically, a pair of paper sheets (personal wipes) is placed on a support base having a hole with a diameter of 40 mm or more in the center, distilled water is taken into a micropipette, and distilled water is added to a test piece from a height of about 10 mm. Of 300 μL. The time from when the water droplet contacts the test piece until the water is completely absorbed and the reflection on the paper surface disappears is measured in 0.01 second units using a stopwatch. The test is performed 5 times, and the average value is a value obtained by the test procedure for recording to the first decimal place.

The dry paper strength of the personal wipes was tested in accordance with JIS P 8113 (tensile property test method).

The water absorption of the personal wipes was measured under two conditions: dry conditions and wet conditions.

The amount of water absorption under dry conditions indicates the amount of water absorbed by the personal wipes for 0.5 seconds under dry conditions. The measurement method is as follows. First, a four-fold paper sample is cut into a 100 mm square, and the weight of the dry paper sample is measured. The paper sample was dropped and immersed in pure water horizontally from a height of 10 cm, and after 0.5 seconds, it was lifted from pure water, and the weight after 10 seconds was measured. The value obtained by subtracting.

About the amount of water absorption in the wet condition, the amount of water absorbed by the personal wipe on the wet condition in 0.5 seconds is shown. In the measurement method, a four-fold paper sample is cut into a 100 mm square, 3 g of water is dropped using a micropipette, and after 1 minute, the sheet weight is measured. The paper sample was dropped and immersed in pure water horizontally from a height of 10 cm, and after 0.5 seconds, it was pulled up from pure water, measured for weight after 10 seconds, and a sheet when 3 g of water was dropped. The value was obtained by subtracting the weight.

Sensory evaluation was performed on the following six items.
-Touch (dry): Evaluation was performed by wiping the palm with a dry product.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
-Touch (wet): Evaluation was performed by wiping the palm with a product in which about 1 g of moisture was applied to the four-folded sheet surface (1/4 of the sheet) by spraying.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
-Wipeability to details: When wiping wet hands after washing with tap water, details such as between fingers and nails were intensively wiped and evaluated.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
・ Thickness of security: Thickness of the product in a dry state was evaluated by wiping hands wet with water and wiping.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
Wipeability other than moisture (dry): 0.3 g of a white paint on the back of the hand was spread to a size of 20 mm × 7 mm, and wiped with a product in a dry state after 5 seconds for evaluation.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
-Wipeability other than moisture (wet): Spread 0.3 g of white paint on the back of the hand to a size of 20 mm x 7 mm, and give water about 1 g to the quadrilateral sheet (1/4 sheet) by spraying after 5 seconds. The product was wiped and evaluated.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
-Water absorption (dry); Evaluation was performed by wiping wet hands with a tap in a dry product.

Evaluation was made in five stages: bad: ×, slightly bad: ▲, normal: △, good: ◯, very good: ◎.
-Presence or absence of see-through when absorbing water: The product was evaluated for the see-through state when a wet product was washed with water and wiped wet hands.

裏 Breakthrough: x, sometimes breakthrough: △, no breakthrough, but fingertips have a wet feeling: ◯, do not breakthrough, fingertips do not have a wet feeling: ◎ Evaluation was made in four stages.

As is apparent from the results shown in Tables 1A to 3C, Examples 1 to 3 having a basis weight of 13.7 [g / m ² ] and a ply number of 4 to 6 were measured under dry and wet conditions. It has been found that it has excellent touch and wiping properties and water absorbency when dry, and has good characteristics as a personal wipe.

On the other hand, the basis weight is 13.7 [g / m ² ], and the comparative example 1 with two plies and the comparative example 2 with three plies are inferior in the sense of security due to thickness and the sense of see-through when absorbing water, It was found that the paper was not suitable for personal wipes.

Comparative Example 3 having a basis weight of 13.7 [g / m ² ] and a ply number of 7 is inferior in touch and dryness to details under dry conditions, and lacks suitability as a personal wipe. I understood.

Further, Comparative Examples 4 to 7 having a basis weight of 19.2 [g / m ² ] and a ply number of 3 to 6 are inferior in detail wiping properties and lack suitability as a personal wipe. I found out.

From this result, it was found that the basis weight of the dry crepe paper 1 constituting the personal wipe 10 is preferably 13 g / m ² or more and 16 g / m ² or less.

As shown in Tables 1A to 1C and Tables 2A to 2C, the evaluation results regarding the number of plies of the dry crepe paper 1 constituting the personal wipe 10 were found to be good as 4 to 6 sheets.

In this way, 4 to 6 sheets of dry crepe paper 1 made of 100% coniferous or hardwood chemical pulp and made to have a basis weight of 13 g / m ² or more and 16 g / m ² or less are overlapped and ply bonded. The interpersonal wipe 10 has a water absorption of 180 to 250 g / m ² for 0.5 seconds under dry conditions and a water absorption of 160 to 210 g / m ² for 0.5 seconds under wet conditions. a m ^2, MMD in wet conditions is 13.0 to 15.0. The interpersonal wipe 10 has excellent characteristics as a personal wipe, as in Examples 1 to 3 described above, having excellent touch and wiping properties in dry and wet conditions, and water absorption in dry conditions. ing.

Also, the interpersonal wipe 10 is excellent in instantaneous water absorption so that the water absorption speed under dry conditions is 0.3 to 1.5 seconds / 300 μL.

The interpersonal wipe 10 has good softness so that the softness at a clearance of 20 mm is 0.5 to 0.8 cN.

As described above, the interpersonal wipe 10 according to the present invention has softness that is comparable to a non-woven wiper in both dry and wet conditions, and has excellent water absorption performance and wiping properties. Therefore, it can be used as a paper wiper that can wipe the human body suitably whether dry or wet.

The application of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.

This application claims priority of the basic application No. 2015-179068 filed on September 11, 2015 with the Japan Patent Office, the entire contents of which are incorporated herein by reference.

1 Dry crepe paper 10 Personal wipes

Claims (4)

1. A personal wipe,
   Having a stack of 4 to 6 sheets of dry crepe paper having a basis weight of 13 g / m ² or more and 16 g / m ² or less and bonded together;
   The stack has a water absorption of 180 to 250 g / m ² for 0.5 seconds under dry conditions and a water absorption of 160 to 210 g / m ² for 0.5 seconds under wet conditions. An interpersonal wipe characterized in that the average deviation of the coefficient of friction under conditions is 13.0 to 15.0.
2. 2. The personal wipe according to claim 1, wherein the water absorption speed of the stacked body under dry conditions is 0.3 to 1.5 seconds / 300 μL.
3. The interpersonal wipe according to claim 1, wherein the softness of the stacked bodies at a clearance of 20 mm is 0.5 to 0.8 cN.
4. 2. The interpersonal wipe according to claim 1, wherein the dry crepe paper is joined by pin embossing.

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