KR20210031831A - Body fluid absorbent article - Google Patents

Abstract

The present invention relates to a body fluid-absorbing article capable of absorbing a body fluid on a spot basis after surface material exudation. Also, provided is a body fluid-absorbing article which suppresses surface material tear during use. The body fluid-absorbing article is configured by a surface material (1), a fluid absorber (3), and a leakage prevention material (4) being arranged in order from a body fluid exudation side. The surface material (1) has cotton fibers as constituent fibers, and is made of a non-woven fabric in which the cotton fibers are entangled with each other. The non-woven fabric is applied with an emulsion containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, an emulsion containing stearic acid amide and hydrogenated tallow oil, or an emulsion containing stearic acid amide and palm oil. Cationized starch may be additionally applied to the non-woven fabric. The amount of application of the emulsion is 0.05 to 1.5 wt% with respect to the weight of the non-woven fabric. The amount of application of the cationized starch is 3 to 5 wt% with respect to the weight of the non-woven fabric. A bulky non-woven fabric (2) with cushioning properties may be inserted between the surface material (1) and the fluid absorber (3). The fluid absorber (3) is made of pulp fiber aggregate. The leakage prevention material (4) is made of a body fluid-impermeable synthetic resin film.

Description

Body fluid absorbent article {BODY FLUID ABSORBENT ARTICLE}

The present invention relates to a body fluid-absorbing article such as a sanitary napkin or a disposable diaper.

Body fluid-absorbing articles such as sanitary napkins are arranged in the order of a surface material, a liquid absorbent, and a leak-preventing material (water-absorbing material) from the body fluid exudation side. Since the surface material directly contacts the skin, nonwoven fabrics made of cellulose-based fibers such as cotton fibers having a good touch as constituent fibers are employed. The present applicant proposed a flexible nonwoven fabric in which stearic acid amide is added to such a nonwoven fabric in order to obtain a more comfortable nonwoven fabric (Patent Document 1).

Japanese Patent No. 55657916

The present invention is an improved invention of the invention related to Patent Document 1, and the first object is to provide a body fluid-absorbing article capable of spot-absorbing bodily fluid exuded onto a surface material.

Further, a second object is to provide a body fluid-absorbing article having a surface material that is capable of spot-absorbing the body fluid exuded to the surface material, and is excellent in abrasion resistance and is difficult to tear during use.

The present invention has solved the first problem described above by providing a specific oil agent to the surface material. That is, according to the present invention, in a bodily fluid-absorbing article which is arranged in the order of a surface material (1), a liquid absorbent (3), and a leak-preventing material (4) from the body fluid exudation side, the surface material (1) is a cellulose-based An emulsion containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, an emulsion containing stearic acid amide and hydrogenated tallow oil, and stearic acid in a nonwoven fabric made of fibers as constituent fibers and entangled between the constituent fibers. It relates to a bodily fluid-absorbing article, characterized in that it is obtained by imparting an emulsion selected from the group consisting of amide and palm oil.

Moreover, this invention solved the said 2nd subject by providing a cationized starch and a specific oil agent to a surface material. That is, according to the present invention, in a bodily fluid-absorbing article which is arranged in the order of a surface material (1), a liquid absorbent (3), and a leak-preventing material (4) from the body fluid exudation side, the surface material (1) is a cellulose-based In a nonwoven fabric made of fibers as constituent fibers and entangled between the constituent fibers, an emulsion containing cationized starch, lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, amide stearate, and hydrogenated tallow are included. It relates to a bodily fluid-absorbing article, characterized in that it is obtained by imparting an emulsion selected from the group consisting of an oil agent and an oil agent including stearic acid amide and palm oil.

The body fluid-absorbing article according to the present invention has an effect of being capable of spot-absorbing body fluid exuding, since it is used as a surface material to which a specific oil agent is applied. In addition, since a specific oil agent and a cationized starch are used as the surface material, the body fluid exuding can be absorbed in a spot manner, and the surface material is less likely to be torn.

1 is a schematic cross-sectional view of a body fluid-absorbing article according to an example of the present invention.

The surface material 1 used in the present invention is made of a nonwoven fabric containing cellulose fibers as constituent fibers. As the cellulose fiber, cotton fiber, rayon fiber, or the like is used. Particularly, among the cotton fibers, non-skimmed cotton is preferable because the cottonseed oil adhered to the cotton fiber surface makes it easy to absorb the exuded body fluid in a spot manner. As the rayon fiber, short fibers having a fineness of 1 to 10 decitex and a fiber length of 10 to 100 mm are generally used, but long fibers may be used. In the nonwoven fabric, some amount of other types of fibers other than cellulose fibers may be mixed.

Constituent fibers made of cellulose fibers are entangled with each other. Thereby, the constituent fibers are bonded to each other, resulting in a nonwoven fabric having a predetermined strength. Therefore, although an adhesive is not required for bonding the constituent fibers to each other, it is preferable to additionally bond the constituent fibers to each other with cationized starch to have higher strength and excellent wear resistance. As a method of entanglement, a water flow entanglement method is preferable. The basis weight of the nonwoven fabric used in the present invention is about ^{10 to 50 g/m 2.}

A specific oil agent is applied to the nonwoven fabric used in the present invention. As a specific emulsion, an oil containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, an oil containing stearic acid amide and hydrogenated tallow oil, or an oil containing stearic acid amide and palm oil, alone or in combination, is used. do. By using such a specific oil agent, the performance of both hydrophilicity and water repellency is appropriately imparted, and the body fluid exuding can be absorbed in a spot manner. It is preferable that the quantitative ratio of lipophilic glyceryl monostearate and polyoxyethylene lauryl ether in the oil agent, the quantitative ratio of stearic acid amide and hydrogenated tallow oil, and the quantitative ratio of stearic acid amide and palm oil are about the same amount.

In order to impart an oil agent to the nonwoven fabric used in the present invention, generally, the oil agent is applied as a liquid. In the case of lipophilic glyceryl monostearate and polyoxyethylene lauryl ether, since polyoxyethylene lauryl ether is a liquid, the lipophilic glyceryl monostearate may be dissolved or dispersed therein and applied to a nonwoven fabric. In the case of stearic acid amide and hydrogenated tallow oil, both may be dissolved in a solvent such as acetic acid and applied to a nonwoven fabric. In addition, when a cationized starch and an oil agent are used in combination, a mixed solution obtained by dissolving or dispersing these oils in a cationized starch solution may be applied to a nonwoven fabric.

Although the amount of the oil to be applied is arbitrary, in general, it is preferably 0.05 to 1.5% by weight based on the weight of the nonwoven fabric. If the applied amount is less than 0.05% by weight, there is a tendency that it becomes difficult to absorb the body fluid in a spot manner. In addition, when the applied amount exceeds 1.5% by weight, there is a tendency for the nonwoven fabric to have a lower strength elongation.

As described above, the cationized starch is for adhesively bonding the constituent fibers to each other. The cationized starch easily adheres to the cellulose-based fibers, and thus the strength of the nonwoven fabric can be improved. Starch may have a molecular weight of several thousand levels to hundreds of thousands of levels, but in the present invention, it is preferable to employ those having a molecular weight of several thousands to hundreds of thousands of levels. When tens of millions of levels of starch are used, the thickening liquid becomes highly viscous, making it difficult to impart to the nonwoven fabric. Specifically, wheat starch, potato starch, corn starch, high amylose-containing corn starch, tapioca starch, rice starch, taro starch, and the like are used. As the cationizing agent for cationizing these starches, conventionally known diethylaminoethyl chloride, 3-chloro-2-hydroxypropyltrimethylammonium chloride, 2,3-epoxypropyltrimethylammonium chloride, and the like are used.

The amount of cationized starch to be applied is arbitrary, but in general, it is preferably 3 to 5% by weight based on the weight of the nonwoven fabric. When the applied amount is less than 3% by weight, a tendency for abrasion resistance to decrease occurs. In addition, when the applied amount exceeds 5% by weight, the touch and flexibility of the nonwoven fabric tends to decrease.

In the body fluid-absorbing article according to the present invention, a liquid-absorbing body 3 is disposed next to the surface material 1. The liquid absorbing body 3 is an aggregate mainly composed of pulp fibers. In the present invention, a cushiony bulky nonwoven fabric 2 may be disposed between the surface material 1 and the liquid absorbing body 3. By arranging such a bulky nonwoven fabric 2, the texture of the surface material 1 becomes better. The bulky nonwoven fabric 2 is thicker than the nonwoven fabric constituting the surface material 1. In addition, as the constituent fibers of the bulky nonwoven fabric 2, it is preferable that hydrophobic fibers other than cellulose fibers are used. This is because, when hydrophilic fibers such as cellulose fibers are used, spot liquid absorption of the surface material 1 is impaired.

After the liquid absorbing body 3, a leakage preventing material 4 is disposed. As the leak-preventing material 4, a film made of a synthetic resin that is impermeable to body fluids or the like is used. A fixture (not shown) such as double-sided adhesive tape may be disposed on the surface of the leak-preventing material 4 (the opposite surface to the skin side). This is because the body fluid-absorbing article is fixed to the undergarment by means of a fastener so that it does not shift during use.

The body fluid-absorbing article according to the present invention is suitably used as a sanitary napkin or a disposable diaper. It can also be used as a wound dressing material that absorbs blood exuding from the wound site.

Example

Example 1

[Preparation of non-woven fabric]

Bleached cotton (manufactured by Marusan Industrial Co., Ltd.) to which 0.4% by weight of natural fats and oils (cottonseed oil) was attached was prepared. This bleached cotton was opened and accumulated through an airlay card to obtain a fibrous web having a ^{basis weight of about 30 g/m 2.} This fibrous web was placed on a support made of a 90 mesh plastic woven fabric, and water flow was intertwined while being conveyed. The water flow entanglement was performed by the following method using a spray device in which spray holes having a nozzle diameter of 0.1 mm were arranged in a row at a hole spacing of 0.6 mm. That is, the water flow sprayed at the injection pressure 5.5 MPa toward the surface of the fiber web is performed twice, and then the water flow sprayed at the injection pressure 5.5 MPa toward the back surface of the fiber web is performed twice, thereby forming the fiber fleece. Got it. This fiber fleece was placed on a support made of a 10-mesh plastic woven fabric, and water flow was further entangled while being conveyed. In this water flow treatment, water flow sprayed at an injection pressure of 5.5 MPa was performed twice using the above injection device to obtain a nonwoven fabric.

[Preparation of emulsion]

An emulsion containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether was prepared.

[Manufacture of surface material]

The above-described oil agent was applied to the nonwoven fabric using a kiss coater. The amount of the oil agent applied was 0.3% by weight based on the weight of the nonwoven fabric. After applying the oil agent, it dried at a temperature of 130°C to obtain a surface material having a ^{basis weight of 30 g/m 2.}

Example 2

In place of the oil agent used in Example 1, a surface material was obtained in the same manner as in Example 1, except that an oil agent obtained by dissolving stearic acid amide and hydrogenated tallow oil in acetic acid was applied. On the other hand, the amount of the oil agent composed of stearic acid amide and hydrogenated tallow oil was 0.1% by weight based on the weight of the nonwoven fabric.

Example 3

[Preparation of non-woven fabric]

Bleached cotton (manufactured by Marusan Industrial Co., Ltd.) to which 0.4% by weight of natural fats and oils (cottonseed oil) was attached was prepared. This bleached cotton was opened and accumulated through an airlay card to obtain a fibrous web having a ^{basis weight of about 35 g/m 2.} This fibrous web was placed on a mesh-like support, and water flow was entangled while being conveyed. The water flow entanglement was performed by the following method using a spray device in which spray holes having a nozzle diameter of 0.1 mm were arranged in a row at a hole spacing of 0.6 mm. In other words, after placing the fiber web on a 100 mesh support body and performing two times of water flow sprayed from the spraying device at a spraying pressure of 2.8 MPa toward the surface of the fiber web, the fiber web is inverted and sprayed toward the back surface of the fiber web. Water flow sprayed at a pressure of 2.8 MPa was performed twice to obtain a fiber fleece. This fibrous fleece was placed on a 25 mesh support, and water sprayed at a spraying pressure of 4.1 MPa was performed twice using the spraying device described above to obtain a nonwoven fabric.

[Preparation of emulsion]

An emulsion containing stearate and palm oil was prepared.

[Manufacture of surface material]

The above-described oil agent was sprayed onto the nonwoven fabric, and then dried at 100°C to obtain a surface material to which 0.3% by weight of the oil agent was added to the weight of the nonwoven fabric.

Example 4

A surface material was obtained in the same manner as in Example 3, except that the amount of the oil agent applied to the weight of the nonwoven fabric was 0.5% by weight.

Example 5

A surface material was obtained in the same manner as in Example 3, except that the amount of the oil agent applied to the weight of the nonwoven fabric was set to 0.7% by weight.

Comparative Example 1

To the nonwoven fabric obtained in Example 3, a gelatinized starch (starch having a molecular weight of several hundred thousand levels) was applied by spray, and then dried at 100°C to obtain a surface material to which 3% by weight of gelatinized starch was added to the weight of the nonwoven fabric.

Comparative Example 2

To the nonwoven fabric obtained in Example 3, a solution containing a paper strength enhancer containing polyacrylic acid (salt) as a main component was applied by spraying, and then dried at 100° C. to contain 3% by weight of the paper strength enhancer based on the weight of the nonwoven fabric. The applied surface material was obtained.

About the surface materials obtained in Examples 1-5 and Comparative Examples 1 and 2, spot liquid-absorbing property (mm) was evaluated by the following method. The results are shown in Table 1.

[Evaluation of spot liquid absorption (mm)]

From each of the surface materials obtained in Examples 1 to 5 and Comparative Examples 1 and 2, three 10 cm x 10 cm specimens were collected. Three test pieces were superimposed and placed on the filter paper. 1 cc of a blue solution was added dropwise to the test piece, and left to stand for 5 minutes. After that, only the above test piece (the test piece directly in contact with the blue solution) is taken out, and the widest vertical length (mm) and the widest horizontal length (mm) of the blue colored area are summed, and the spot absorbency (mm ).

From the results of Table 1, it can be seen that the surface materials according to Examples 1 to 5 are superior to the surface materials according to Comparative Examples 1 and 2 in spot liquid absorption.

Example 6

[Preparation of mixed solution]

An oil agent containing stearic acid amide and palm oil was added and mixed to the cationized starch (starch having a molecular weight of several hundred thousand levels) to obtain a mixed solution. The weight ratio of the cationized starch and the oil agent in the mixed solution was 6:1.

In place of the oil agent of Example 3, a surface material to which 3% by weight of cationized starch and 0.5% by weight of the oil agent were applied was obtained by the same method as in Example 3, except that this mixed solution was used.

Example 7

A surface material to which 3% by weight of cationized starch and 1.0% by weight of an oil agent were added was obtained by the same method as in Example 6, except that a mixture solution of 3:1 by weight of the cationized starch and the oil agent was used.

Example 8

In the same manner as in Example 6, except for using an oil containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether instead of the oil containing stearate amide and palm oil, based on the weight of the nonwoven fabric. A surface material to which 3% by weight of cationized starch and 0.5% by weight of an oil agent were applied was obtained.

Example 9

With respect to the weight of the nonwoven fabric by the same method as in Example 7, except that an oil containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether was used instead of the oil containing stearate amide and palm oil. A surface material to which 3% by weight of cationized starch and 1.0% by weight of an oil agent were applied was obtained.

Example 10

Cationized starch based on the weight of the nonwoven fabric by the same method as in Example 6, except that a cationized starch (starch with a molecular weight of tens of thousands of levels) was used instead of the cationized starch (starch with a molecular weight of several hundred thousand levels). A surface material to which 3% by weight and 0.5% by weight of an oil agent were applied was obtained.

Example 11

Cationized starch based on the weight of the nonwoven fabric by the same method as in Example 7, except that a cationized starch (starch having a molecular weight of tens of thousands of levels) was used instead of the cationized starch (starch having a molecular weight of several hundred thousand levels). A surface material to which 3% by weight and 1.0% by weight of an oil agent were applied was obtained.

Example 12

A surface material to which 5% by weight of cationized starch and 0.5% by weight of the oil agent were added was obtained by the same method as in Example 10 except for using a mixed solution in which the weight ratio of the cationized starch and the oil agent was 10:1.

Example 13

A surface material to which 5% by weight of cationized starch and 1% by weight of the oil agent were added was obtained by the same method as in Example 10, except for using a mixed solution in which the weight ratio of the cationized starch and the oil agent was 5:1.

Example 14

Cationized starch based on the weight of the nonwoven fabric by the same method as in Example 12, except that a cationized starch (starch with a molecular weight of several thousand levels) was used instead of the cationized starch (starch with a molecular weight of tens of thousands of levels). A surface material to which 5% by weight and 0.5% by weight of an oil agent were applied was obtained.

Example 15

[Preparation of mixed solution]

An oil agent containing stearic acid amide and palm oil was added and mixed to the cationized starch (starch having a molecular weight of several thousand levels) to obtain a mixed solution. The weight ratio of the cationized starch and the oil agent in the mixed solution was set to 50:7.

In place of the mixed solution of Example 6, a surface material to which 5% by weight of cationized starch and 0.7% by weight of an oil agent were applied was obtained by the same method as in Example 6, except that this mixed solution was used.

Example 16

[Preparation of mixed solution]

To the gelatinized starch (starch having a molecular weight of several hundred thousand levels), an oil agent containing stearic acid amide and palm oil was added and mixed to obtain a mixed solution. The weight ratio of the gelatinized starch and the oil agent in the mixed solution was 10:1.

In place of the mixed solution of Example 6, a surface material to which 3% by weight of gelatinized starch and 0.3% by weight of an oil agent were applied was obtained by the same method as in Example 6, except that this mixed solution was used.

Example 17

Cationized starch based on the weight of the nonwoven fabric by the same method as in Example 10, except that a cationized starch (starch with a molecular weight of several thousand levels) was used instead of the cationized starch (starch with a molecular weight of tens of thousands of levels). A surface material to which 3% by weight and 0.5% by weight of an oil agent were applied was obtained.

Example 18

[Preparation of mixed solution]

An oil agent containing stearic acid amide and palm oil was added and mixed to a liquid liquid containing a strength enhancing agent containing polyacrylic acid (salt) as a main component, and a mixed liquid was obtained. The weight ratio of the oil agent and the oil agent in the mixed solution was 10:1.

In place of the mixed solution of Example 6, except for using this mixed solution, by the same method as in Example 6, a surface material to which 3% by weight of a paper strength enhancer and 0.3% by weight of an oil agent were applied to the weight of the nonwoven fabric was obtained.

Example 19

[Preparation of mixed solution]

An oil agent containing stearic acid amide and palm oil was added and mixed to a liquid liquid containing a strength enhancing agent containing polyacrylic acid (salt) as a main component, and a mixed liquid was obtained. The weight ratio of the oil agent and the oil agent in the mixed solution was 30:7.

In place of the mixed solution of Example 6, except for using this mixed solution, by the same method as in Example 6, a surface material to which 3% by weight of a paper strength enhancer and 0.7% by weight of an oil agent were applied to the nonwoven fabric weight was obtained.

Comparative Example 3

The nonwoven fabric obtained in Example 3 was not subjected to any treatment, and was directly used as a surface material.

For the surface materials obtained in Examples 6 to 19 and Comparative Example 3, in addition to the above-described spot liquid absorption (mm), abrasion resistance (times) was evaluated by the following method. The results are shown in Table 2.

[Evaluation of abrasion resistance (ash)]

From each of the surface materials obtained in Examples 6 to 19 and Comparative Example 3, 30 samples having a length of 293 mm x a width of 165 mm were collected in a random direction. The six points of these samples were set in a Hakjin type friction fastness tester (manufactured by Daiei Science & Technology Co., Ltd., model "RT-300") in accordance with JIS L 0849, and abrasion resistance was measured. When setting the sample, a urethane mat was previously laid under the sample, and the sample was fixed to the Hakjin type friction fastness tester mounting fixture so that wrinkles did not enter. 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 were brought into contact with each other. Then, the friction terminal was slid at a reciprocating speed of 30 times/min, and the number of reciprocations when tearing was visible at all six samples was measured. This measurement was performed 5 times, and the average value of these was taken as abrasion resistance (times). On the other hand, even if the number of reciprocations exceeded 500, the measurement was stopped and the number of reciprocations was 500, when tearing could not be observed in all six samples. Therefore, as for the value of the wear resistance (times), 500 times is the maximum.

1: surface material
2: bulky non-woven fabric
3: liquid absorbent
4: Leak-proof material

Claims (7)

In the bodily fluid-absorbing article, which is arranged in the order of a surface material, a liquid absorbent, and a leak-preventing material from the body fluid exudation side,
The surface material is a nonwoven fabric made of cellulose-based fibers as constituent fibers, and the constituent fibers are entangled with each other,
Emulsions containing lipophilic glyceryl monostearate and polyoxyethylene lauryl ether;
Emulsions including stearic acid amide and hydrogenated tallow oil; And
Emulsions containing amide stearate and palm oil
A bodily fluid-absorbing article, wherein an emulsion selected from the group consisting of is imparted. The method of claim 1,
A body fluid-absorbing article obtained by further imparting cationized starch. The method of claim 1,
A body fluid-absorbing article in which the cellulose-based fibers are cotton fibers. The method of claim 1,
A body fluid-absorbing article in which the amount of oil applied is 0.05 to 1.5% by weight based on the weight of the nonwoven fabric. The method of claim 1,
A body fluid-absorbing article in which the amount of cationized starch is applied in an amount of 3 to 5% by weight based on the weight of the nonwoven fabric. The method of claim 1,
A body fluid-absorbing article formed by disposing a bulky nonwoven fabric having cushioning properties between a surface material and a liquid-absorbing body. The method of claim 1,
The liquid absorbent is a body fluid absorbent article that is an aggregate of pulp fibers.

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