JP2006045730A - Water-absorbing nonwoven fabric and plaster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-absorbing staple fiber nonwoven fabric which little irritates the skins, even when bringing into direct contact with the skins in a state containing water and a medicinally active ingredient, has excellent adhesiveness to human bodies, and is hardly broken. <P>SOLUTION: (1) (A) The staple fiber nonwoven fabric is characterized by containing 5 to 60% of adhesive fibers having a fineness of 0.5 to 3.0 dtex, and 40 to 95% of fibers having a water absorption coefficient of 200 to 30,000%. (2) (B) The staple fiber nonwoven fabric according to (A), wherein the basis weight of the fabric is 5 to 100 g/m<SP>2</SP>. (3) (C) The staple fiber nonwoven fabric according to either of (A) and (B), wherein the surface of a heating roller is thermally treated. (4) (D) The staple fiber nonwoven fabric according to (A) to (C), which is used for a member coming in contact with human bodies. (5) A plaster using the staple fiber nonwoven fabric according to (A) to (D). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a non-woven fabric and a patch having excellent water absorption. More specifically, the present invention relates to a water-absorbent nonwoven fabric and a patch material that are excellent in adhesion to the human body when swollen with water and have little physical irritation to the human body and are suitable for use in contact with the human body.

Conventionally, water-absorbing fibers have been deployed in many fields such as water-stopping materials and building materials, as well as hygiene materials and adhesive materials. Among such uses, in applications used for the human body, such as sanitary materials and adhesive materials, in particular, using the characteristics of water-absorbing fibers, it is used to prevent stuffiness due to sweat or the like (for example, see Patent Document 1). Or it is known to use as a blood-absorbing material (for example, refer patent document 2). These hygiene materials and patch materials use water-absorbing fibers to absorb body fluids flowing out from the human body, and do not supply moisture or medicinal ingredients to the skin. Generally used for the human body. For this reason, there was no particular problem with respect to the irritation of the water-absorbent fibers to the skin and the adhesion to the skin.
JP-A-6-207358 JP 2001-120588 A

On the other hand, a water-absorbent fiber contains a medicinal ingredient and is brought into contact with the skin to actively supply the active ingredient to the skin. A poultice material using a nonwoven fabric containing a water-absorbent fiber and a low-temperature shrinkable fiber is used. It is disclosed (see, for example, Patent Document 3). Such a poultice material does not require an adhesive, prevents skin irritation, and effectively supplies active ingredients to the skin. However, if a short fiber nonwoven fabric made of water-absorbing fibers containing moisture is in direct contact with the skin, the fiber ends will irritate the skin, giving it a strong discomfort, and further damaging the skin for use in sensitive areas. Problems arise. Furthermore, the swollen water-absorbing nonwoven fabric has a problem that the adhesion to the skin is poor, and when it is used in a place with large irregularities or a place where movement is intense, it is partially peeled from the skin. Moreover, since the water-absorbing fiber containing moisture is easy to adhere to the skin, when the nonwoven fabric is peeled off from the skin, many fiber pieces are detached from the nonwoven fabric and remain on the skin.
Japanese Patent Laid-Open No. 7-32640

  The present invention provides a water-absorbing short fiber non-woven fabric that is less irritating to the skin, excellent in adhesion to the human body, and hard to break even when it is directly brought into contact with the skin by containing moisture or medicinal ingredients. With the goal.

The present invention employs the following means in order to solve such problems.
That is, (1) (A) 5% to 60% of adhesive fibers having a fineness of 0.5 to 2.7 dtex, and 40% to 95% of water absorbent fibers having a water absorption rate of 200% to 30000%. The short fiber nonwoven fabric (2), (B) having a basis weight of 5 to 100 g / m ² , (3) (C) The surface is heated with a heat roller (A) to (C) characterized in that the short fiber nonwoven fabric according to any one of (A) to (C), (4) (D) the short fiber according to (A) to (D) A non-woven fabric, a patch material comprising the short fiber non-woven fabric described in (5) (A) to (D).

  The water-absorbing short fiber nonwoven fabric according to the present invention has a low irritation to the skin in the state of containing moisture and is excellent in adhesion to the human body. It can be brought into contact with the skin without using water, can provide moisture and medicinal ingredients directly and effectively to the skin, and has an effect that the short fiber nonwoven fabric can be peeled cleanly after use.

The present invention is described in detail below.
The adhesive fiber used in the present invention is preferably 0.5 to 2.7 dtex. If it is 2.7 dtex or more, the fiber ends strongly irritate the skin, giving the user an unpleasant feeling, and may further damage the skin. On the other hand, if it is less than 0.5 dtex, it is used as a patch, and when it moves, the fiber partially breaks, and when peeled off from the skin, it causes problems such as non-woven fabric pieces and fiber pieces remaining on the skin. is there. More preferably, it is 0.8-2.5 dtex, Most preferably, it is 1.0-2.0 dtex.

  Moreover, it is preferable that the water absorbing fiber used in the present invention has a water absorption rate of 200% or more. This is because, within such a range, moisture and medicinal components can be sufficiently contained, and adhesion to the skin can be maintained for a long time. Especially preferably, it is 1000% or more, More preferably, it is 10,000% or more.

  The medicinal ingredients referred to in the present invention include those used for beauty such as keeping healthy skin in addition to those having a health restoring action such as healing of stiff shoulders and sprains.

The water-absorbing fiber used in the present invention is not particularly limited as long as it satisfies the above-mentioned fineness and water absorption rate. As the water-absorbing fiber, an acrylonitrile fiber having a COOX (X: alkali metal or NH ₄ ) group is particularly used. preferable. This is because such a fiber has a function of keeping the pH weakly acidic, and the fiber itself has a function of keeping the skin healthy.

The water-absorbing short fiber nonwoven fabric according to the present invention preferably contains 40% to 95% by weight of water-absorbing fibers. If it is less than 40% by weight, moisture and medicinal components cannot be sufficiently retained, and furthermore, the adhesion to the skin becomes insufficient, and it becomes easy to peel off. Moreover, if it is 95 weight% or more, it will become difficult to hold | maintain the intensity | strength of a nonwoven fabric, when it moves at the time of use, a nonwoven fabric will fracture | rupture, and problems, such as a nonwoven fabric piece remaining on skin at the time of peeling, will arise.
A more preferred water-absorbing fiber content is 60% to 80% by weight, and most preferably 65% to 75% by weight.

The water-absorbing short fiber nonwoven fabric according to the present invention preferably has a basis weight before containing water of 5 to 100 g / m ² . If the basis weight is less than 5 g / m ² , the moisture and medicinal components cannot be sufficiently retained. Further, if the basis weight is 100 g / m ² or more, the adhesiveness to the skin is lowered, and it becomes difficult to use it in a portion with large irregularities or a portion where movement is intense. A more preferred basis weight is 10 to 50 g / m ² , most preferably 15 to 35 g / m ² .

  The water-absorbing short fiber nonwoven fabric according to the present invention preferably includes adhesive fibers. Short fiber nonwoven fabric made of water-absorbing fibers is easy to break when it swells, and according to fiber entanglement by the needle punch method etc., it breaks when moving in the state of use etc., and the nonwoven fabric / fiber becomes fragments and adheres to the skin and is removed This is because problems such as it becomes difficult to do. In particular, when the basis weight is lowered in order to improve the adhesion to the skin, the need to contain adhesive fibers is increased. The content of adhesive fibers is preferably 5 to 60% by weight, more preferably 10 to 50% by weight, and most preferably 25 to 35% by weight. If it is less than 5% by weight, a sufficient effect cannot be exhibited, and breakage at the time of water absorption tends to occur. On the other hand, if it is 60% by weight or more, sufficient water absorption of the short fiber nonwoven fabric cannot be ensured.

  The adhesive fiber used in the present invention may be a fiber having a composite fiber (such as a seascore structure) such as PET / PP, PP / PE, PET / PE, PET / PET, PE / PE, PP / PP, and the like. . In particular, polyolefin fibers are preferred because they have high flexibility and the fiber ends are less irritating to the skin.

Furthermore, in the present invention, it is preferable to heat-treat at least one surface with a heat roller. Such treatment effectively improves the strength, prevents moisture from remaining on the skin after the moisture-absorbing monofilament nonwoven fabric is brought into contact with the skin and peels it off. This is because irritation to the body can be reduced.

The embossing pattern and conditions of the heat roller are not particularly limited, but the embossed area ratio is preferably 20% to 100%. This is because if the embossed area is less than 20%, more fiber pieces remain on the skin. More preferably, it is 50% or more, and most preferably 100% (flat roller).

Moreover, it is recommended that the heating conditions with the heat roller be 10 to 20 ° C. higher than the melting point of the adhesive fiber (low melting point component) and the linear pressure is 10 to 150 kg / 2.5 m. If the linear pressure is less than 10 kg / 2.5 m, the short fiber nonwoven fabric containing water will be easily decomposed and loosened when an external action is applied during use, etc., or the fiber pieces adhere to the skin. This is because the problem of. In addition, when the normal short fiber nonwoven fabric has a linear pressure that is too high, the texture becomes stiff and becomes paper-like. However, the short fiber nonwoven fabric containing water-absorbing fibers has a linear pressure in a swollen state. Has a small influence on the texture, and the upper limit is not particularly problematic. However, if it exceeds 150 kg / 2.5 m, the fiber is damaged, which is not preferable. A particularly preferable range is 20 to 140 kg / 2.5 m, more preferably 30 to 120 kg / 2.5 m, and most preferably 40 to 100 kg / 2.5 m.

  The short fiber nonwoven fabric according to the present invention is particularly effective for use in contact with the human body, and can be used for a patch, a poultice material, a cosmetic material, and the like.

  Hereinafter, the present invention will be specifically described with reference to examples and comparative examples. In addition, the value measured by the following method was employ | adopted for evaluation.

(Water absorption rate)
(Water absorption rate) A sample of 0.4 to 0.42 g (W2) is precisely weighed in a 300 ml beaker, and 300 ml of pure water is added thereto. After 30 minutes, the sample is wrapped in a nylon filter cloth (200 mesh), and a centrifugal dehydrator. Remove water between fibers by (160 G × 5 minutes, where G is the acceleration of gravity). The weight of the sample prepared by this method is measured (W1 g). From the above measurement results, calculation is performed according to the following equation.
Water absorption (%) = ((W1-W2) / W2) × 100
(Skin irritation)
Five female monitors were selected, and a sample of 15 cm × 15 cm was sufficiently swollen with lotion, attached to the waist, and left for 1 hour. Questionnaires were taken for the stimuli during the period according to the following criteria, and the average score of five people was evaluated.
0 points: Uncomfortable enough to withstand use 3 points: Willingness to use if effective for health and skin, but discomfort 5 points: No discomfort even with poultry.
(Adhesion)
Five female monitors were selected, the skin lotion was sufficiently swollen in a sample 15cm x 15cm, attached to the waist, and visually evaluated according to the following criteria for adhesion after standing for 1 hour. evaluated.
0 point: The sample peeled off due to movement during use.
3 points: Complete peeling of the sample did not occur, but a portion not partially adhered to the skin was observed.
5 points: No peeling of the sample was observed.
(Nonwoven fabric break)
Select 5 female monitors, swell the skin lotion into a sample 15cm x 15cm, put it on the waist, leave it for 1 hour, peel off the sample and leave the sample on the skin (gel) Were observed and evaluated according to the following criteria.
0 point: A piece of nonwoven fabric remained on the entire surface of the sample poultice.
3 points: Remaining sample nonwoven fabric pieces were conspicuous.
5 points: No sample nonwoven fabric pieces were found.

Example 1
70 parts by weight of 2.9 dtex × 38 mm water-absorbing fiber (Toyobo Co., Ltd .: product name Lanseal), 30 parts by weight of 1.7 dtex × 51 mm polyolefin hot melt adhesive fiber (manufactured by Chisso Corporation, product name ESC Sufu) Was mixed and carded to form a web sheet of 20 g / m ² , and passed between two stainless steel flat rollers heated to 150 ° C. at a linear pressure of 50 kg / 2.5 m to obtain a non-woven sheet. The evaluation results are shown in Table 1.

(Example 2)
65 parts by weight of 2.9 dtex × 38 mm water-absorbing fiber (product of Toyobo Co., Ltd .: product name Lanseal), 35 parts by weight of 1.1 dtex × 51 mm polyolefin-based hot-melt adhesive fiber (manufactured by Chisso Corporation: product name ESC Sufu) Was mixed and carded to form a web sheet of 20 g / m ² , and passed between two stainless steel flat rollers heated to 150 ° C. at a linear pressure of 50 kg / 2.5 m to obtain a non-woven sheet. The evaluation results are shown in Table 1.

(Example 3)
70 parts by weight of 2.9 dtex × 38 mm water-absorbing fiber (Toyobo Co., Ltd .: product name Lanseal), 30 parts by weight of 1.7 dtex × 51 mm polyolefin hot melt adhesive fiber (manufactured by Chisso Corporation, product name ESC Sufu) Were mixed and carded to form a 30 g / m ² web sheet, and passed between two stainless steel flat rollers heated to 150 ° C. at a linear pressure of 50 kg / 2.5 m to obtain a nonwoven sheet. The evaluation results are shown in Table 1.

(Comparative Example 1)
30 parts by weight of a 2.9 dtex × 38 mm water-absorbing fiber (Toyobo Co., Ltd .: product name Lanseal), 3.3 parts by weight of a 3.3 dtex × 51 mm polyolefin hot melt adhesive fiber (manufactured by Chisso Corporation, product name ESC Sufu) Was mixed and carded to form a web sheet of 20 g / m ² , and passed between two stainless steel flat rollers heated to 150 ° C. at a linear pressure of 50 kg / 2.5 m to obtain a non-woven sheet. The evaluation results are shown in Table 1.

(Comparative Example 2)
100 parts by weight of 2.9 dtex × 38 mm water-absorbing fiber (manufactured by Toyobo Co., Ltd .: product name Runseal) was carded to form a 20 g / m ² web sheet, and two stainless steel flat rollers heated to 150 ° C. The space was passed at a linear pressure of 50 kg / 2.5 m to obtain a nonwoven fabric sheet. The evaluation results are shown in Table 1.

(Comparative Example 3)
70 parts by weight of 2.9 dtex × 38 mm water-absorbing fiber (Toyobo Co., Ltd .: product name Lanseal), 30 parts by weight of 1.7 dtex × 51 mm polyolefin hot melt adhesive fiber (manufactured by Chisso Corporation, product name ESC Sufu) Were mixed and carded to form a 120 g / m ² web sheet, and passed between two stainless steel flat rollers heated to 150 ° C. at a linear pressure of 50 kg / 2.5 m to obtain a nonwoven sheet. The evaluation results are shown in Table 1.

The water-absorbing short fiber nonwoven fabrics (Examples 1 and 2) according to the present invention were water-absorbing fibers having small skin irritation and excellent adhesion, and further, short fiber pieces hardly remained on the skin. On the other hand, the water-absorbing short fiber non-woven fabric outside the scope of the present invention has problems such as large skin irritation, poor adhesion, or short fiber fragments remaining on the skin, which are difficult to put into practical use. .

  Even if the present invention contains moisture or a medicinal component directly in contact with the skin, the irritation to the skin is small, the adhesiveness to the human body is excellent, and further, the nonwoven fabric can be used without breaking and separating. Therefore, it can be used as a patch, poultice, beauty material, etc. regardless of the location of the human body such as joints, soles of the face, and the face, and contributes greatly to the industry.

Claims (5)

A short fiber nonwoven fabric comprising 5% to 60% of adhesive fibers having a fineness of 0.5 to 2.7 dtex and 40% to 95% of water absorbent fibers having a water absorption rate of 200% to 30000%. Staple fiber nonwoven fabric of claim 1 wherein the basis weight is characterized by a 5 to 100 g / m ² The short fiber nonwoven fabric according to claim 1, wherein the surface is heat-treated with a heat roller. It is used for the member which contacts a human body, The short fiber nonwoven fabric of Claims 1-4 characterized by the above-mentioned A patch material comprising the short fiber nonwoven fabric according to claim 1.