KR20170104620A

KR20170104620A - Nonwoven fabric for skin adhesion and method for manufacturing the same

Info

Publication number: KR20170104620A
Application number: KR1020177023671A
Authority: KR
Inventors: 아키히데 이시자와; 마키 이토
Original assignee: 오지 홀딩스 가부시키가이샤
Priority date: 2015-04-03
Filing date: 2016-04-01
Publication date: 2017-09-15
Also published as: TWI637089B; JPWO2016157915A1; KR101999628B1; CN107407026B; JP6579192B2; WO2016157915A1; CN107407026A; TW201641769A

Abstract

A nonwoven fabric for skin adhesion excellent in liquid retentivity and adhesion to skin, and a method for producing the same. A nonwoven fabric for skin bonding, which comprises a liquid and contains an aqueous binder having a glass transition point of 10 占 폚 or less and has a basis weight of 20 g / m ² or more and 80 g / m ² or less, Nonwoven fabric for skin adhesion.

Description

Nonwoven fabric for skin adhesion and method for manufacturing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric for skin adhesion, and more particularly to a nonwoven fabric for skin adhesion, which is absorbed by a liquid such as a chemical solution or a lotion and adhered to skin such as a face, body, hands or feet.

BACKGROUND ART [0002] Nonwoven fabrics for skin adhesion, which are conventionally adhered to skin by absorbing a liquid such as a chemical solution or lotion, are used for purposes such as medical purposes and cosmetic purposes. Nonwoven fabrics for skin bonding for medical purposes include, for example, wound dressings and drug-releasing adhesives. A non-woven fabric for skin bonding for cosmetic purposes includes, for example, a face mask. These nonwoven fabrics for skin adhesion are required to have various qualities such as a property of absorbing and retaining an appropriate amount of liquid (liquid retention), a property of adhering to the skin following the undulation of the adhesion site, and such persistence (adhesion).

In order to obtain good liquid retention, hydrophilic fibers such as cellulose fibers having a higher hydrophilicity than synthetic fibers are preferably used as the main component of the nonwoven fabric for skin bonding recently.

Patent Document 1 discloses a nonwoven fabric comprising cellulose fiber nonwoven fabric layers composed of specific microcellulose fibers laminated on one surface or both surfaces of a nonwoven fabric layer containing cellulose fibers in order to obtain good adhesion in addition to liquid- Discloses a nonwoven fabric structure.

Patent Document 1: JP-A-2014-205924

However, in Patent Document 1, it is necessary to produce microcellulose fibers composed of specific microcellulose, and the cost is increased. For this reason, the configuration of Patent Document 1 is intended for high-end products and is unsuitable for general-purpose products.

An object of the present invention is to provide a nonwoven fabric for skin adhesion and a manufacturing method thereof which are different from those of Patent Document 1 and have both good liquid retentivity and adhesive property.

A nonwoven fabric for skin bonding and a method of producing the same according to the present invention for solving the above-mentioned problems have the following embodiments.

[1] A nonwoven fabric for skin bonding, comprising a liquid and containing an aqueous binder having a glass transition point of 10 캜 or lower and having a basis weight of 20 g / m ² or more and 80 g / m ² or less, Is 1 mm or less.

[2] The nonwoven fabric for skin adhesion according to [1], wherein the aqueous binder is an ethylene-vinyl acetate copolymer.

[3] The skin bonding nonwoven fabric according to [1] or [2], wherein the skin nonwoven fabric is a dry nonwoven fabric obtained by bonding a plurality of fiber sheets formed by an airlaid method with an aqueous binder and then compressing the same. Non-woven.

[4] The skin bonding nonwoven fabric according to any one of [1] to [3], wherein the skin bonding nonwoven fabric comprises cellulose fibers as a main component.

[5] The skin bonding nonwoven fabric according to any one of [1] to [4], wherein the skin-binding nonwoven fabric contains cellulose-based fibers in an amount of 50 mass% or more based on the total mass of the skin- Nonwoven fabric for skin adhesion.

[6] The skin bonding nonwoven fabric according to any one of [1] to [5], wherein the skin bonding nonwoven fabric contains the aqueous binder in an amount of 5 mass% or more and 30 mass% or less.

[7] by a plurality of fiber sheet process and formed to form a plurality of fiber sheets, by air-laid method a glass transition point interconnect with an aqueous binder of less than 10 ℃, a basis weight of 20g / m ² more than 80g / m ² or less And a step of compressing the obtained dry-type nonwoven fabric so that the paper thickness is 1 mm or less.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a nonwoven fabric for skin adhesion having good liquid retentivity and adhesive property.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a table showing the configuration and test results of a nonwoven fabric for skin bonding according to an embodiment. FIG.
2 is a table showing the composition and test results of a nonwoven fabric for skin bonding according to a comparative example.

Hereinafter, embodiments of the present invention will be described in detail. On the other hand, the embodiment of the present invention is not limited to the embodiment described below.

&Lt; Nonwoven fabric for skin adhesion &

Skin-adhesive non-woven fabric of the present invention is a non-woven skin-adhesive is provided for use by a liquid, a glass transition point and an aqueous binder of less than 10 ℃, a basis weight of less than 20g / m ² more than 80g / m ^2, And the thickness before incorporation of the liquid is 1 mm or less.

The nonwoven fabric for skin bonding of the present invention contains hydrophilic fibers as a main component. The hydrophilic fiber is preferably a cellulose-based fiber. The nonwoven fabric for skin adhesion of the present invention is preferably obtained by bonding a plurality of fiber sheets formed by an airlaid method to each other with an aqueous binder and compressing them.

The nonwoven fabric for skin bonding of the present invention has a laminated structure comprising a plurality of fiber sheets to be laminated and an aqueous binder distributed over the entire plurality of laminated fiber sheets. The aqueous binders are distributed substantially uniformly in the thickness direction of the laminate structure, and serve to bond adjacent fiber sheets together and fix the fibers inside.

The nonwoven fabric for skin adhesion of the present invention can be obtained by bonding the fiber sheets to each other using an aqueous binder and compressing them as described above. Therefore, the nonwoven fabric for skin bonding of the present invention is in a state in which the intervals are narrowed by compressing the fibers in the inside of the nonwoven fabric for use in the present invention before use, and compared with the similarly manufactured nonwoven fabric for skin adhesion And the thickness is thin. On the other hand, when the nonwoven fabric for skin bonding according to the present invention contains a liquid and is provided for use, water enters the voids inside the nonwoven fabric, and the fiber itself swells, and the thickness can be restored.

(Manufacturing method of nonwoven fabric for skin adhesion)

The nonwoven fabric for skin adhesion of the present invention can be obtained by compressing a dry nonwoven fabric produced by a dry process. (A forming step) of forming a fibrous web by dry disassembly of raw fibers in a dry method and a step of spraying an aqueous emulsion (an aqueous binder) which becomes a binder to the fibrous web onto a fibrous web And a drying heating step (drying step) of binding the fibers of the fibrous web to each other by the aqueous binder, is used. The so-called air laid method (sometimes referred to as an airlay method) is used. The air laid method includes a Honshu paper method, a Callaway method, a web method, a J & J method, a KC method, and a scot method. Among them, the Honshu paper method is most suitably used. The dry nonwoven fabric thus produced is compressed under the condition that the thickness before incorporation of the liquid is 1 mm or less. For compression, any known means may be used, such as, for example, passing through a slit or calender nip.

(Thickness of nonwoven fabric for skin adhesion)

The nonwoven fabric for skin adhesion according to the present invention is formed by compressing so as to have a thin thickness at a stage prior to use in order to improve the property of adhering to the skin and the persistence (adhesion) following the undulation of the adhesion site. In use, by including a liquid, the thickness of the nonwoven fabric for skin adhesion is gradually restored to its original thickness.

In order to obtain good adhesion, the dry nonwoven fabric of the present invention has a thickness of not more than 1 mm, preferably not more than 0.8 mm, more preferably not more than 0.4 mm, and still more preferably not more than 0.3 mm before incorporation of the liquid . The lower limit of the thickness before incorporation of the liquid is not particularly limited as long as the effects of the present invention are exhibited. However, there is a limit to the thickness (thinness) according to the basis weight or the film thickness, Usually 0.05 mm or more.

(Fibers used in nonwoven fabrics for skin adhesion)

The nonwoven fabric for skin bonding of the present invention contains hydrophilic fibers as raw fiber. The hydrophilic fiber is preferably a cellulose-based fiber.

Non-wood pulp such as wood pulp (softwood, light leaf water), rag pulp, linter pulp, linen pulp, duck, duck duck, and amphipulph, and highland pulp can be used as the raw material of the cellulose-based fiber. In particular, wood pulp fibers are industrially useful and desirable. As such wood pulp fibers, mechanical pulp (GP), refiner ground pulp (RGP), thermomechanical pulp (TMP), chemical pulp such as sulfite pulp, kraft pulp and the like can be used. Further, regenerated fibers such as rayon (cellulose fibers produced by the viscose method) and TENCEL (registered trademark) (purified cellulose fibers by solvent spinning) can also be used. The above-mentioned cellulose-based fibers may be used singly or in combination of two or more kinds.

As the raw material of the cellulose-based fiber used in the present invention, conifer-kraft pulp (NKP) is particularly suitable from the viewpoints of supply amount, quality stability, cost and the like.

The nonwoven fabric for skin bonding according to the present invention contains hydrophilic fibers as a main component and is preferably at least 50% by mass, more preferably at least 60% by mass, and still more preferably at least 50% by mass, based on the total mass of the skin- More preferably 70% by mass or more, and particularly preferably 75% by mass or more. If the amount of the hydrophilic fiber to be blended is large, the amount of absorption of the nonwoven fabric for skin adhesion is increased, and the liquid-absorbing property is improved. The upper limit of the amount of the hydrophilic fiber to be blended is preferably 95% by mass or less from the viewpoint of the lower limit of the amount of the aqueous binder to be described later and the strength obtained thereby.

The nonwoven fabric for skin adhesion of the present invention may contain hydrophobic fibers of any material depending on the situation. When hydrophobic fibers are used, the blending amount thereof is preferably 0.01 mass% or more and 30 mass% or less based on the total mass of the raw material fibers of the nonwoven fabric for skin bonding. By including the hydrophobic fibers in the amount in this range, the nonwoven fabric for skin bonding can ensure proper liquid retention and can appropriately transfer the liquefied liquid to the adhered portion of the skin.

Examples of the hydrophobic fibers include polyolefin fibers such as polyethylene (PE) and polypropylene (PP), polyester (PET) fibers and nylon fibers. Further, a composite fiber comprising a combination of synthetic resins having different melting points can be used. Examples of the combination of the resin of the conjugate fiber include PE / PP, PE / PET, PP / PET, low melting point PET / PET, low melting point PP / PP, nylon 6 / nylon 66 and the like. In addition, the composite fibers include side-by-side type conjugated fibers spun in parallel with other fibers, sheath-core conjugated fibers spun outward with a low melting point resin and with a high melting point resin inside. Anything is available.

The average fiber length of the raw material fibers of the nonwoven fabric for skin adhesion is preferably 1 to 10 mm, more preferably 1 to 6 mm. It is also possible to use a mixture of fibers having different fiber lengths. If the average fiber length of the raw material fiber is within this range, it is easy to form the web by the airlaid method and it is easy to obtain a uniform dispersion state of the fibers.

The average fiber diameter of the raw material fibers of the nonwoven fabric for skin bonding is preferably 3 탆 or more, more preferably 3 to 100 탆, still more preferably 5 to 80 탆, particularly preferably 10 to 60 탆 Mu m. On the other hand, the average fiber length and the average fiber diameter were measured by an optical microscope at five points, respectively, and the average fiber length and the average fiber diameter were calculated.

(Aqueous binder)

The nonwoven fabric for skin bonding of the present invention includes an aqueous binder having a glass transition point (Tg) of 10 DEG C or lower. In the present invention, an aqueous binder is used to fix fibers together.

Examples of the aqueous binder include an aqueous solution type binder such as casein, sodium alginate, hydroxyethyl cellulose, carboxymethyl cellulose sodium salt, polyvinyl alcohol (PVA), sodium polyacrylate, etc. having a glass transition point (Tg) And emulsions such as polyacrylic acid esters, acrylic styrene copolymers, polyvinyl acetate, ethylene / vinyl acetate copolymer (EVA), acrylonitrile / butadiene copolymer, methyl methacrylate / butadiene copolymer, styrene / butadiene copolymer An emulsion type binder such as coalesced latex (SBR), or the like can be used. Among them, an emulsion type binder of ethylene-vinyl acetate copolymer (EVA) or styrene-butadiene copolymer latex (SBR) can be suitably used.

As described later, the basis weight of the nonwoven fabric for skin bonding of the present invention is set to a predetermined range in order to ensure the property (liquid retention) for absorbing and holding an appropriate amount of liquid. On the other hand, on the other hand, the nonwoven fabric for skin bonding according to the present invention is formed so as to have a thin thickness at the stage before use in order to improve the property of adhering to the skin and the durability (adhesion) And is compressed. By including a liquid at the time of use, the thickness of the nonwoven fabric for skin adhesion is gradually restored to its original thickness. By reducing the thickness by compression in this manner, the nonwoven fabric for skin adhesion tends to feel a little harder and feel like a film in the stage immediately after bonding. In the present invention, by employing an aqueous binder having a glass transition point (Tg) of 10 占 폚 or less, it is possible to reduce the rigidity and film feeling due to the reduction in thickness.

From the viewpoint of obtaining such an effect, the glass transition point (Tg) of the aqueous binder of the present invention is 10 DEG C or less, preferably 5 DEG C or less. The lower limit of the glass transition point (Tg) is not particularly limited as long as the effect of the present invention is exhibited. The glass transition point (Tg) is preferably -100 DEG C or higher, more preferably -50 DEG C Or more, and more preferably -30 DEG C or more.

The amount of the aqueous binder to be applied to the nonwoven fabric for skin bonding of the present invention is preferably 5 to 30 mass% based on the total mass of the nonwoven fabric for skin bonding from the viewpoint of balance between the strength and the liquid retentivity of the nonwoven fabric for skin bonding , More preferably 10 to 25 mass%.

In the aqueous binder, a hydrophilic agent for promoting absorption or a pigment for coloring may be dispersed, if necessary.

Examples of the hydrophilizing agent include nonionic surfactants such as polyoxyethylene alkyl ethers, sorbitan fatty acid esters, sucrose fatty acid esters and polyglycerin fatty acid esters, amphoteric surfactants such as alkylamide betaines, polyoxyethylene alkyl ether sulfates, , And anionic surfactants such as dioctylsulfosuccinate Na salt. In the present invention, it is not limited to one kind, and two kinds or three or more kinds may be mixed and used.

The amount of the hydrophilizing agent to be added is not particularly limited, and the more the amount of the hydrophilizing agent is increased, the more the amount of the elution from the nonwoven fabric for skin adhesion increases. It is preferably 0.01 to 3% based on the total mass of the nonwoven fabric for skin adhesion.

The basis weight of the nonwoven fabric for skin bonding of the present invention is in the range of 20 to 80 g / m ² , preferably in the range of 30 to 50 g / m ² . When the basis weight is less than 20 g / m ² , the amount of hydrophilic fibers contained per unit area is small, so that the amount of absorption of the liquid such as a chemical solution or lotion is insufficient. In addition, the rigidity is low and the feeling of use when used as a nonwoven fabric for skin adhesion tends to deteriorate. When the basis weight is more than 80 g / m ² , the amount absorbed per unit area is large and the liquid-absorbing property is good, and the adhesiveness is deteriorated.

(Surface fiber layer)

The nonwoven fabric for skin bonding of the present invention may include a surface fiber layer for the purpose of improving the surface, such as changing the softness (tactile feeling) and feeling on one side or both sides thereof.

The surface fiber layer is, in terms of the surface improving effect by the rigid and laminated as a skin-adhesive non-woven fabric for, and in the range of 0.5 ~ 20g / m ² per one side are preferred, and more preferably 0.5 ~ 10g / m ^2, more preferably Is 1.0 to 3.0 g / m < ^{2 &} gt ;.

As the fiber used for the surface fiber layer, cellulose fibers such as rayon and cotton are preferable from the viewpoint of absorbency and softness, and arbitrary fibers such as other natural fibers and synthetic fibers (e.g., polyester) It is also possible to use it.

Example

&Lt; Example 1 >

A dry nonwoven fabric was produced as follows by an airlaying method nonwoven machine of Honshu Kogyo Kagaku KK.

(Fiber for surface fiber layer 1) and commercially available softwood lime-crush pulp (NBKP) (manufactured by Daiwa Bure Ray Co., Ltd., 1.7 dtex (fiber diameter 12 μm × fiber length 29 mm) Pulp fibers (fibers for intermediate fiber layer 1) obtained by fibrillation with a dry-type dissolving device and rayon fibers (fibers for surface fiber layer 2) used for the surface fiber layer 1 are dropped along with the airflow in this order is deposited, the surface of the fibrous layer 1 (a target basis weight of 2.0g / m ^2), an intermediate fiber layer 1 (a target basis weight of 28.6g / m ^2), and the surface fiber layer 2, the fibrous web containing (a target basis weight of 2.0g / m ²⁾ in this order, .

On the fiber web, an aqueous binder liquid, which is a mixture of an aqueous binder and a hydrophilic agent, was sprayed and dispersed. Then, the fibrous web was passed through a hot-air dryer (atmospheric temperature 170 ° C) to bind the fibers to each other. Then, the fibrous web was reversed, and the aqueous binder liquid was dispersed from the opposite side of the surface on which the binder liquid was first dispersed. At this time, an equal amount of the aqueous binder solution was spread on each of both sides so that the solid content of the binder on both sides was 9.8 g / m ² . Then, by again passing through a hot air drier (ambient temperature 170 ℃) the web to give a dry non-woven fabric having a basis weight of 42.5g / m ² (the target basis weight 43.0g / m ^2). Then, the obtained dry-type nonwoven fabric was subjected to compression treatment so that the thickness of the finally obtained nonwoven fabric for skin bonding was 0.23 mm, thereby obtaining a skin bonding nonwoven fabric having a thickness of 1 mm or less (0.23 mm).

As the aqueous binder, an ethylene-vinyl acetate copolymer (EVA) (glass transition point (Tg) -17 ° C) of a commercially available product A was used, and as the hydrophilic agent, dioctylsulfosuccinate Na salt Was used in an amount of 0.12 mass% with respect to the obtained nonwoven fabric for skin adhesion.

&Lt; Example 2 >

The target basis weight of each fibrous layer to the surface of the fibrous layer 1 (2.0g / m ^2), an intermediate fiber layer 1 (29.7g / m ^2), and the surface fiber layer ² (2.0g / m 2) and, as the aqueous binder, a commercially available product B of ethylene Except that the vinyl acetate copolymer (EVA) (glass transition point (Tg) -19 ° C) was used and the solid content of the binder on both sides of the aqueous binder was 10.1 g / m ² , Dry nonwoven fabric of 43.9 g / m ² was obtained. Subsequently, the obtained dry-type non-woven fabric was subjected to a compression treatment so that the thickness of the non-woven fabric for skin bonding finally obtained became 0.74 mm to obtain a skin-bonding nonwoven fabric having a thickness of 1 mm or less (0.74 mm).

&Lt; Example 3 >

The target basis weight of each fibrous layer to the surface of the fibrous layer 1 (2.0g / m ^2), an intermediate fiber layer 1 (27.9g / m ^2), and the surface fiber layer ² (2.0g / m 2) and, as the aqueous binder, a commercially available ethylene-C (EVA) (glass transition point (Tg) of 4 占 폚) was used. As the hydrophilizing agent, a sucrose fatty acid ester was used in an amount of 0.44 mass% with respect to the obtained nonwoven fabric for skin adhesion, except that the total solid content of both surfaces to a so that the 7.7g / m ^2, in the same manner as in example 1 to obtain a dry basis weight of the nonwoven fabric of 40.1g / m ^2. Subsequently, the obtained dry-type nonwoven fabric was subjected to compression treatment so that the thickness of the finally obtained nonwoven fabric for skin bonding was 0.34 mm, to obtain a skin-bonding nonwoven fabric having a thickness of 1 mm or less (0.34 mm).

The target basis weight of each fibrous layer to the surface of the fibrous layer 1 (2.0g / m ^2), an intermediate fiber layer 1 (27.6g / m ^2), and the surface fiber layer ² (2.0g / m 2) and, as the aqueous binder, a styrene panmaepum D -Butadiene copolymer (SBR) (glass transition point (Tg) -19 deg. C) was used as the hydrophilic binder, and sucrose fatty acid ester was used as the hydrophilizing agent in an amount of 0.56 mass% except that the solid content of the total of both surfaces to one that is 10.5g / m ^2, in the same manner as in example 3, to obtain a dry basis weight of the nonwoven fabric of 42.7g / m ^2. Then, the obtained dry-type nonwoven fabric was subjected to compression treatment so that the thickness of the finally obtained nonwoven fabric for skin adhesion was 0.35 mm, thereby obtaining a skin-bonding nonwoven fabric having a thickness of 1 mm or less (0.35 mm).

&Lt; Comparative Example 1 &

The target basis weight of each fibrous layer to the surface of the fibrous layer 1 (2.0g / m ^2), an intermediate fiber layer 1 (27.2g / m ^2), and the surface fiber layer ² (2.0g / m 2) and, as an aqueous binder, of ethylene panmaepum E (Glass transition point (Tg) 14 deg. C) was used as the hydrophilic binder resin, and sucrose fatty acid ester was used as the hydrophilizing agent in an amount of 0.40 mass% with respect to the obtained nonwoven fabric for skin adhesion, the total solid content of both surfaces in the same manner as in 11.1g / m ² the example 3 except that to obtain a dry basis weight of the nonwoven fabric of 42.7g / m ^2. Next, the obtained dry-type non-woven fabric was subjected to compression treatment so that the thickness of the non-woven fabric for skin bonding finally obtained became 0.78 mm to obtain a skin-bonding nonwoven fabric having a thickness of 1 mm or less (0.78 mm).

&Lt; Comparative Example 2 &

The target basis weight of each fibrous layer to the surface of the fibrous layer 1 (2.0g / m ^2), an intermediate fiber layer 1 (27.6g / m ^2), and the surface fiber layer ² (2.0g / m 2) and, as an aqueous binder, of ethylene panmaepum F (Glass transition point (Tg) of 20 deg. C) was used as the hydrophilic binder, and sucrose fatty acid ester was used as the hydrophilizing agent in an amount of 0.43 mass% with respect to the obtained nonwoven fabric for skin adhesion, A dry nonwoven fabric having a basis weight of 39.5 g / m < ² > was obtained in the same manner as in Example 3, except that the solid content of both surfaces was set to 7.5 g / m ² . Next, the obtained dry-type non-woven fabric was subjected to a compression treatment so that the thickness of the non-woven fabric for skin bonding finally obtained became 0.33 mm to obtain a skin-bonding nonwoven fabric having a thickness of 1 mm or less (0.33 mm).

&Lt; Comparative Example 3 &

First, a dry nonwoven fabric having a basis weight of 44.2 g / m ² was obtained by the same method as described in Example 1. Next, the obtained dry-type non-woven fabric was subjected to compression treatment so that the thickness of the non-woven fabric for skin bonding finally obtained became 1.02 mm to obtain a skin-bonding nonwoven fabric having a thickness of more than 1 mm (1.02 mm).

The following measurements and evaluation tests were conducted on the nonwoven fabrics for skin adhesion of the examples and comparative examples thus obtained. Fig. 1 and Fig. 2 show the constitution and test results of the nonwoven fabric for skin adhesion according to Examples and Comparative Examples.

I. Basis weight

The basis weight was measured in accordance with Japanese Industrial Standards JIS P8124 'Paper and cardboard-measuring method of basis weight'.

II. thickness

The thickness was measured in accordance with Japanese Industrial Standards JIS P8118 'Paper and cardboard - Test method for thickness and density'.

III. Wet tensile strength

The wet tensile strength in the longitudinal direction (MD) was measured in accordance with Japanese Industrial Standard JIS P8135 'Paper and cardboard-wet tensile strength test method'.

Since the nonwoven fabric for skin bonding is imparted with a chemical solution, lotion, or the like, it has wet tensile strength as one of required quality related to use. The wet tensile strength is preferably as large as possible within a range in which adhesion does not adversely affect. In the present embodiment, the specification of the wet tensile strength was set to 12.0 N / 100 mm or more, and a sample satisfying this was provided in the evaluation test. On the other hand, the wet tensile strength was secured by adjusting the amount of dispersion of the aqueous binder.

IV. Stiffness (Stiffness)

The strength was measured in accordance with the Japanese Industrial Standard JIS L1096 'Test Method for Fabrics and Textiles' The larger the strength, the higher the stiffness.

Since the nonwoven fabric for skin adhesion is imparted with a chemical solution, lotion or the like and is used by being adhered to the skin, it is one of required quality related to use and has appropriate rigidity. (Rigidity) was evaluated as being smaller (lower) as far as it was easy to handle, from the viewpoint of compliance with the undulation of the bonding site.

V. Absorption time (liquid retention)

According to the measurement method of sedimentation velocity shown in Item 6 (1) of "Medical Gauze / Medical Cotton Base" (Ministry of Health, Labor and Welfare) The basket was dropped in water to measure the time until it sinks below the surface of the water, and this was taken as the absorption time. And the absorption time of 5 seconds or less was regarded as the required quality related to the use of the nonwoven fabric for skin adhesion. The shorter the absorption time, the higher the absorbency and the better the liquid retention.

VI. Adhesiveness

As the adhesive property of the nonwoven fabric for skin adhesion, the sensation and appearance (pitting property) of the skin when the nonwoven fabric for skin adhesion was adhered were evaluated in five stages by sensory tests by five users.

Specifically, first, a sample having a size of 100 x 100 mm was folded eight times, and 10 g of a commercially available serum was added and uniformly infiltrated. Subsequently, the folded sample after the penetration was adhered to the skin inside the elbow, and the degree of adhesion was judged from the sensation of the skin and appearance (fit feeling). The larger the degree of adhesion, the better the adhesion. The best one is 5, the worst one is 1, the average of the evaluation points by 5 users is calculated, and the evaluation is expressed as an integer of 5 to 1.

In the Examples and Comparative Examples, the absorption times were all about 5 seconds or less, and satisfied the set required quality. On the other hand, as for the adhesiveness, evaluation 3 or evaluation 2 was the comparative example, whereas evaluation 4 or evaluation 5 better than that of all examples was obtained.

Example 1 (0.23 mm), Example 2 (0.74 mm), and Comparative Example 3 (1.02 mm) were used as samples having an equivalent glass transition point (Tg) and a basis weight of an aqueous binder, Were compared. In Comparative Example 3 having a thickness exceeding 1 mm, the strength was high and the adhesiveness was deteriorated. In Examples 1 and 2, the thinner the thickness before incorporation of the liquid, the smaller the strength and the better the adhesion.

Example 3 (Tg 4 ° C) and Comparative Example 2 (Tg 20 ° C) were compared as samples in which the glass transition temperature (Tg) of the aqueous binder was different, and the thickness and the thickness were the same before containing the liquid. The adhesiveness by the sensory evaluation was evaluated in Evaluation 3 of Comparative Example 2, and in Evaluation 3 in Example 3, the adhesiveness by the sensory evaluation was the same.

Similarly, Example 2 (Tg -19 deg. C) and Comparative Example 1 (Tg 14 deg. C) were compared as samples in which the glass transition temperature (Tg) of the aqueous binder was different and the thickness and the thickness before equilibrium were the same. In Example 2, the strength was small and the adhesiveness by the sensory evaluation was good (Comparative Example 1 was Evaluation 3, whereas Example 2 was Evaluation 4 better than Comparative Example 1).

Industrial availability

The nonwoven fabric for skin bonding of the present invention is excellent in both lyophobicity and adhesiveness, and can be suitably used for purposes such as a purpose of being used for the purpose of absorbing a liquid such as a chemical solution or a lotion, and adhering to the skin.

Claims

A nonwoven fabric for skin bonding, which comprises a liquid and contains an aqueous binder having a glass transition point of 10 占 폚 or less and has a basis weight of 20 g / m ² or more and 80 g / m ² or less, Wherein the nonwoven fabric is a nonwoven fabric for skin adhesion.

The method according to claim 1,
Wherein the aqueous binder is an ethylene-vinyl acetate copolymer.

3. The method according to claim 1 or 2,
Wherein the skin bonding nonwoven fabric is a dry nonwoven fabric obtained by bonding a plurality of fiber sheets formed by an airlaid method with an aqueous binder and then compressing the same.

4. The method according to any one of claims 1 to 3,
Wherein the skin nonwoven fabric comprises cellulose-based fibers as a main component.

5. The method according to any one of claims 1 to 4,
Wherein the skin-bonding nonwoven fabric contains cellulose-based fibers in an amount of 50 mass% or more based on the total mass of the skin-bonding nonwoven fabric.

6. The method according to any one of claims 1 to 5,
Wherein the skin bonding nonwoven fabric contains the aqueous binder in an amount of 5 mass% or more and 30 mass% or less.

A step of forming a plurality of fiber sheets, by air-laid method, and a plurality of fiber sheets formed of a glass transition point interconnect with an aqueous binder of less than 10 ℃, a basis weight of 20g / m ² more than 80g / m ² dry non-woven fabric of less than And a step of compressing the obtained dry-type nonwoven fabric so that the paper thickness is 1 mm or less.