JP3229699U - Surface material for body fluid-absorbing articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface material of a body fluid-absorbing article capable of improving the abrasion resistance of the surface material of the surface material in contact with the skin without lowering the touch of the surface of the body fluid-absorbing article in contact with the skin. To do. SOLUTION: The surface material 1 of a body liquid-absorbent article is a laminate in which a cotton fiber web is laminated on the surface of a long fiber web, and the laminate constitutes a long fiber web. The long fibers and the cotton fibers that make up the cotton fiber web are integrated by interlacing with each other, the texture of the long fiber web is less than 10 g / m2, and the single fiber fineness of the long fibers is 1 decitex or more and 3 decitex. Less than, the mass ratio of long fiber web to cotton fiber web (long fiber web: cotton fiber web) is 1: 1.5 to 3.5, and the grain size of the laminate is 20 g / m2 to 35 g / m2. As a result, the wear resistance becomes excellent. [Selection diagram] Fig. 1

Description

The present invention relates to a surface material used for a portion of a body fluid-absorbing article such as a sanitary napkin, a disposable diaper, or an incontinence pad, which comes into contact with the skin.

Conventionally, short-fiber non-woven fabrics and long-fiber non-woven fabrics have been adopted as surface materials for body fluid-absorbing articles such as sanitary napkins, disposable diapers, and incontinence pads. Since the surface material comes into direct contact with the skin, a material that is soft to the touch is required, and cotton fibers tend to be preferred. However, since the non-woven fabric made of only cotton fibers is inferior in strength to the long-fiber non-woven fabric, the applicant has proposed a surface material made by laminating cotton fibers and long-fiber non-woven fabric (Patent Document 1). ).
Utility Model Registration No. 3218416

The present invention is an improvement based on the invention described in Patent Document 1, and is a surface of a surface material that comes into contact with the skin without deteriorating the feel of the surface of the body fluid-absorbing article that comes into contact with the skin. It is an object to improve the wear resistance in the above.

The present invention achieves the above-mentioned problems, and is a surface material of a body fluid-absorbent article. The surface material is a laminate in which a cotton fiber web is laminated on the surface of a long fiber web.
In the laminate, the long fibers constituting the long fiber web and the cotton fibers constituting the cotton fiber web are integrated by being entangled with each other.
The basis weight of the long fiber web is less than 10 g / m ² , and the single fiber fineness of the long fiber is 1 decitex or more and less than 3 decitex.
The mass ratio of the long fiber web to the cotton fiber web (long fiber web: cotton fiber web) is 1: 1.5 to 3.5.
Basis weight of the laminate in which the gist of the surface material of the body fluid absorbent article which is excellent in wear resistance, which is a ^{20g / m 2 ~35g / m 2} .

The present invention is a surface material for body fluid-absorbing articles such as sanitary napkins, disposable diapers, and incontinence pads, and the surface material is a laminate in which a cotton fiber web is laminated on the surface of a long fiber web. Then, the long fibers constituting the long fiber web and the cotton fibers constituting the cotton fiber web are integrated as a laminated body by being entangled with each other.

The long fiber web is formed by depositing a plurality of continuous long fibers, and the long fibers constituting the long fiber web are preferably composed of a propylene-based polymer. This is because the long fibers composed of the propylene-based polymer are easily bent and have good flexibility, so that they are well entangled with the cotton fibers and become a surface material having excellent wear resistance. Examples of the propylene-based polymer include a propylene homopolymer, a propylene / α-olefin random copolymer, a propylene / α-olefin block copolymer, and the like, and examples of the α-olefin include ethylene, 1-butene, and 1-. Examples thereof include α-olefins other than propylene such as penten, 1-hexene, 1-octene and 4-methyl-1-pentene.

The single fiber fineness of the long fibers constituting the long fiber web in the present invention is 1 decitex or more and less than 3 decitex. By setting the value to 1 decitex or more, the long fibers are not easily cut during the entanglement treatment with the cotton fibers, and the long fibers are entangled well with the cotton fibers while maintaining the morphology of the long fibers. On the other hand, when it is less than 3 decitex, the long fibers have flexibility and are easily bent without resistance to bending, so that the entanglement with the cotton fibers is improved, so that the fibers are dense over the entire surface direction. And evenly entangled. Further, as will be described later, since the texture of the long fiber web is less than 10 g / m ² , when the single fiber fineness of the long fibers constituting the long fiber web exceeds 3 decitex, the number of long fibers occupying the unit area As a result, the entanglement points between the long fibers and the cotton fibers are also relatively reduced, and as a result, the entanglement between the long fiber web and the cotton fiber web is inferior. A surface material having excellent wear resistance cannot be obtained. From such a viewpoint, it is more preferable that the single fiber fineness of the long fiber is 1 decitex or more and 2 decitex or less.

The basis weight of the long fiber web is less than 10 g / m ² . Since the thickness is less than 10 g / m ² and the thickness is small and the gaps penetrating in the thickness direction are also provided, the long fibers and the cotton fibers are densely and uniformly entangled over the entire surface direction. It has excellent wear resistance. In the above-mentioned long fibers having a single fiber fineness, when the basis weight of the long fiber web exceeds 10 g / m ² , it is difficult to retain the voids penetrating in the thickness direction, and it is difficult to achieve the object of the present invention.

As the long fiber web in the present invention, one manufactured by the so-called spunbond method may be used, and one that is partially hot pressed by heat embossing may be used.

The cotton fiber web in the present invention is laminated on the surface of the long fiber web described above and integrated by entanglement. As the cotton fiber constituting the cotton fiber web, a known one may be used, but it is preferable to use non-cotton wool. Non-cotton wool is cotton fiber in which oil and fat components such as cottonseed oil contained in natural cotton fiber have not been completely removed. When cotton wool from which oil and fat components such as cottonseed oil have been completely removed is used, the cotton fibers themselves tend to absorb body fluids and become sticky during use. Therefore, in the case of non-cotton wool, there is an advantage that the liquid absorption property of the cotton fiber itself is lowered and the stickiness is reduced. Further, in order to reduce the liquid absorption property of the cotton fiber itself, it is advisable to add a water repellent to the cotton fiber. As the water repellent, it is preferable to add a specific oil agent described later. Further, as the cotton fiber, it is preferable to use bleached cotton, particularly non-defatted bleached cotton. This is because bleaching makes the cotton fibers white in color, giving a feeling of cleanliness.

Examples of the oil as a water repellent include (1) an oil containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, (2) an oil containing stearic acid amide and hydrogenated beef tallow, and (3) stearic acid amide and palm. It is preferable to add any of the oil agents containing oil. It is advisable to add these oils alone or in combination. By using such a specific oil agent, both hydrophilic and water-repellent performances are appropriately imparted, and the exuding body fluid can be absorbed in a spot. The quantitative ratios of glyceryl monostearate and polyoxyethylene lauryl ether in the oil agent, the quantitative ratios of stearic acid amide and hydrogenated beef tallow oil, and the quantitative ratios of stearic acid amide and palm oil are about the same. Is preferable.

To apply the oil, the oil is generally liquefied and applied. In the case of lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, since the polyoxyethylene lauryl ether is a liquid, lipophilic glyceryl monostearate may be dissolved or dispersed and applied. Further, in the case of stearic acid amide and hydrogenated beef tallow oil, both may be dissolved in a solvent such as acetic acid and applied. When applying, it is preferable to apply to the surface on the cotton fiber web side in a laminate in which the cotton fiber web and the long fiber web are integrated.

The amount of the oil applied is arbitrary, but in general, it is preferably 0.05 to 1.5% by mass with respect to the mass of the cotton fiber web. When the applied amount is 0.05% by mass or more, the spot liquid absorption property of the body fluid can be effectively exhibited. On the other hand, when the applied amount exceeds 1.5% by mass, the fibers tend to slip easily and the fibers tend to be easily entangled with each other.

The surface material of the present invention is a laminate in which the long fibers constituting the long fiber web and the cotton fibers constituting the cotton fiber web are integrated by being entangled with each other. Basis weight of the laminate ^is a ^{20g / m 2 ~35g / m 2} , the weight ratio of the long fiber web and cotton fiber webs (long fiber web: cotton fiber web) is 1: is 1.5 to 3.5 .. When the basis weight of the surface material of the laminated body is 20 g / m ² or more, a good feel of the cotton fiber can be sufficiently felt on the side in contact with the skin, and when it is 35 g / m ² or less, it is possible to sufficiently feel the cotton fiber. The body fluid absorbed by the surface material can be quickly transferred to the absorber located under the surface material. In the present invention, the basis weight of the laminate ^is a ^{20g / m 2 ~35g / m 2} , and the mass ratio of the long fiber web and cotton fiber web: the (long fiber web cotton fiber web), 1 : It is important that it is 1.5 to 3.5. When the mass of the cotton fiber web is 1.5 or more with respect to the mass of the long fiber web, the cotton fiber web covers the surface of the long fiber web well, and the cotton fiber is good on the side in contact with the skin. It is possible to maintain a good feel. On the other hand, by setting the mass of the cotton fiber web to 3.5 or less with respect to the mass of the long fiber web, the long fibers constituting the long fiber web and the cotton fibers constituting the cotton fiber web are densely entangled. When the cotton fibers, which are short fibers, are entwined with the continuous long fibers, even if a force due to friction is applied to the cotton fiber web side, which is the side that comes into contact with the skin, the entanglement of the cotton fibers is difficult to be released and fluffing is difficult. Abrasion resistance is good. When the mass ratio of the cotton fiber web exceeds 3.5 with respect to the mass of the long fiber web, the amount of cotton fiber increases relatively, so that the ratio of the cotton fiber entangled with the long fiber is also relative. When the frictional force on the surface is applied, the cotton fibers existing on the surface side become easier to move without being able to withstand the frictional force, and the entanglement is easily released and fluffing is likely to occur.

The surface material of the present invention has the above-mentioned structure, and as shown in FIG. 1, the surface material 1, the liquid absorbing material 2 and the leakproof material 3 are arranged in this order from the body fluid exuding side. Used as an article.

According to the present invention, it is possible to improve the abrasion resistance of the surface material on the surface of the surface material in contact with the skin without reducing the feel of the surface of the body fluid-absorbing article in contact with the skin.

It is a schematic cross-sectional view of the body fluid-absorbing article which concerns on one example of this invention.

1 Surface material 2 Liquid absorption 3 Leakage prevention material

Example 1
[Preparation of long fiber non-woven fabric]
Polypropylene long-fiber non-woven fabric by the spunbond method, long-fiber non-woven fabric that has been heat-embossed (grain 8 g / m ² , long-fiber single-fiber fineness 1.5 decitex, pressure contact area ratio 18% by heat embossing) Prepared. The melt flow rate of polypropylene (JIS-K7210 temperature 230 ° C., load 2.16 kg) constituting the long fibers is 60 g / 10 minutes.
[Preparation of cotton fiber web]
The bleached cotton having an average fiber length of 25 mm was opened and accumulated by a parallel card machine to prepare a cotton fiber web having a basis weight of 15 g / m ² .
[Laminate]
The long fiber non-woven fabric prepared above and the cotton fiber web are laminated and passed through a high-pressure water flow ejection device (a device in which ejection holes having a hole diameter of 0.1 mm are arranged in a horizontal row with a hole spacing of 0.6 mm) to pass the cotton fiber. A high-pressure water stream was applied from the web side at an ejection pressure of 3 MPa, then a high-pressure water stream was applied at an ejection pressure of 6 MPa, and then inverted and a high-pressure water stream was applied from the long fiber non-woven fabric side at an ejection pressure of 4 MPa. At this time, it was placed on a support made of 90 mesh woven fabric and water flow was applied. After that, it was inverted and placed on a support made of a 15-mesh woven fabric, and a jet pressure of 4 MPa was applied from the cotton fiber web side to obtain a laminated body entangled and integrated. Then, it was heated at 135 ° C. for 120 seconds to evaporate the moisture contained in the laminate to obtain a surface material.

Example 2
A surface material was obtained in the same manner as in Example 1 except that a cotton fiber web having a basis weight of 20 g / m ² was used in Example 1.

Example 3
A surface material was obtained in the same manner as in Example 1 except that a cotton fiber web having a basis weight of 25 g / m ² was used in Example 1.

Example 4
In Example 2, a surface material was obtained in the same manner as in Example 2 except that only a support made of 90-mesh woven fabric was used as the support used when applying the high-pressure water flow.

Example 5
An oil agent containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether was applied to the surface material obtained in Example 2 using a kiss coater. The amount of this oil applied was set to 0.3% by mass with respect to the amount of surface material. When coating using a kiss coater, the coated surface was the surface on the long fiber web side, and after applying the oil agent, it was dried at a temperature of 130 ° C. to obtain the surface material of Example 5.

Comparative Example 1
A surface material of Comparative Example 1 was obtained in the same manner as in Example 1 except that a polypropylene long-fiber non-woven fabric having a basis weight of 16 g / m ² was used as the long-fiber non-woven fabric in Example 1.

The wear resistance of the obtained surface materials of Examples 1 to 5 and Comparative Example 1 was evaluated. The evaluation is as follows.
[Evaluation of wear resistance (times)]
Each surface material obtained in Examples and Comparative Examples was set in a Gakushin type friction fastness tester (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd., model "RT-300") in accordance with JIS L0849. Abrasion resistance was measured. When setting the test piece, a urethane mat was laid under the test piece in advance, and the sample was fixed to a fixture provided in the Gakushin type friction fastness tester so as not to cause wrinkles. Further, the surface of the friction terminal was covered with a cloth adhesive tape, and a load of 300 g was applied to the friction terminal so that the cloth adhesive tape and the sample came into contact with each other. Then, the friction terminal is slid at a reciprocating speed of 30 times / min, the reciprocating operation of the testing machine is stopped every 50 reciprocations, the surface condition of the test piece is visually confirmed, and the reciprocating operation is performed until tear is confirmed. Continued. As for the number of times of wear resistance, for example, when no tear was confirmed at 200 times and tear was confirmed at 250 times, the wear resistance was set to 200 times. Then, for each of the surface materials of Examples and Comparative Examples, two test pieces were measured, and the average value of these was taken as the wear resistance (times). Even if the number of round trips exceeded 500, if the tear could not be visually confirmed, the measurement was stopped and the number of round trips was set to 500. Therefore, the maximum value of wear resistance (times) is 500 times.

As a result of the wear resistance evaluation, the surface material of Example 1 was carried out 500 times, the surface material of Example 2 was carried out 500 times, the surface material of Example 3 was carried out 500 times, and the surface material of Example 4 was carried out 425 times. The surface material of Example 5 was used 200 times, and the surface material of Comparative Example 1 was used 125 times, and the surface material of the present invention was excellent in wear resistance.

Claims (6)

It is a surface material of a body fluid-absorbing article, and the surface material is a laminate in which a cotton fiber web is laminated on the surface of a long fiber web.
In the laminate, the long fibers constituting the long fiber web and the cotton fibers constituting the cotton fiber web are integrated by being entangled with each other.
The basis weight of the long fiber web is less than 10 g / m ² , and the single fiber fineness of the long fiber is 1 decitex or more and less than 3 decitex.
The mass ratio of the long fiber web to the cotton fiber web (long fiber web: cotton fiber web) is 1: 1.5 to 3.5.
Surface material of the body fluid absorbent article which is excellent in wear resistance, wherein the basis weight of the laminate is a ^{20g / m 2 ~35g / m 2} . The surface material of a body fluid-absorbent article having excellent wear resistance according to claim 1, wherein the long fibers are composed of a propylene-based polymer. The surface material of a body fluid-absorbing article having excellent wear resistance according to claim 1 or 2, wherein the web side of the cotton fiber is in contact with the skin. An oil agent is applied to the laminate, and the oil agent is (1) an oil agent containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, (2) an oil agent containing stearic acid amide and hydrogenated beef tallow, (3). ) The surface material of a body fluid-absorbing article having excellent wear resistance according to any one of claims 1 to 3, which is any of an oil agent containing stearic acid amide and palm oil. The surface material of a body fluid-absorbing article having excellent wear resistance according to any one of claims 1 to 4, wherein the cotton fiber is bleached without degreasing. A body fluid-absorbent article, wherein the liquid-absorbent material and the leak-proof material are arranged in this order under the surface material according to any one of claims 1 to 5.