KR20200002781A - Fiber structure - Google Patents

Abstract

In order to provide a fibrous structure having excellent heat retention and wearing comfort, and medical care using the same, more than 15 mass% and less than 40 mass% of viscose rayon-based fibers, more than 10 mass% and less than 45 mass% of cationic salt polyester long fibers, A fiber structure comprising more than 25% by mass and less than 60% by mass of polyacrylic synthetic fibers, and more than 3% by mass and less than 15% by mass of polyurethane-based elastic fibers, and a fiber structure having hairs on the surface or the back of the fiber structure. do.

Description

Fiber structure

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a fiber structure having excellent heat retention and wearing comfort, and to a medical treatment using the same. In particular, the present invention relates to a fiber structure which is preferably used in underwear, t-shirts, and the like directly touching human skin.

Conventionally, as a means of improving thermal insulation such as medical treatment, many medical treatments including a three-layer structure of lining, batting, etc., and outer fabric are known (see Patent Literature 1). However, the surface of these medical treatments has the purpose of improving windproofness and thermal insulation. It has a problem that sweating at the time of wearing is used, and because it is a three-layer structure, it is thick and is not suitable for uses, such as an inner.

Moreover, as a heat insulating fiber product suitable for inner use, the fiber structure containing a viscose rayon fiber, a cationic salt polyester fiber, a polyacrylic synthetic fiber, and a polyurethane elastic fiber is known (refer patent document 2 and patent document 3). ). However, these fiber structures also have a problem of low heat retention rate, and there has been a demand for fiber products with higher heat retention.

Japanese Patent Publication Hei 7-59762 Japan International Publication 2014/192648 Brochure Japanese Patent No. 5453863

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to solve the said subject, the present inventors used the yarn which mixed viscose rayon, ie, a viscose rayon fiber, a cationic salt polyester fiber, a polyacrylic synthetic fiber, and a polyurethane elastic fiber, It was found that it is possible to obtain a fibrous structure excellent in excellent heat retention and wearing comfort by performing brushing.

An object of the present invention is to provide a fiber structure having excellent heat retention and wearing comfort and medical care using the same.

The present invention is to solve the above problems, the fiber structure of the present invention is more than 15% by mass of less than 40% by mass of viscose rayon-based fibers, more than 10% by mass of less than 45% by mass of cationic salt polyester long fiber, polyacrylic synthesis A fiber structure comprising more than 25% by mass and less than 60% by mass of fibers and polyurethane-based elastic fibers in a ratio of more than 3% by mass and less than 15% by mass, and is a fiber structure having hairs on the surface or the back side thereof.

According to a preferred embodiment of the fiber structure of the present invention, the fiber structure is composed of a letter of a two-layer structure.

According to a preferred embodiment of the fiber structure of the present invention, the short fiber fineness of the cationic salted polyester long fibers is 0.6 dtex or more.

According to a preferred embodiment of the fiber structure of the present invention, the thermal insulation rate of the fiber structure is 25% or more.

According to a preferred embodiment of the fiber structure of the present invention, the hygroscopic heat generation of the fiber structure is at least 2.2 ° C.

According to a preferred embodiment of the fibrous structure of the present invention, the fluff adhesion of the cotton having the hair structure of the fiber structure is class 4.0 or higher.

According to a preferred embodiment of the fiber structure of the present invention, the elongation recovery rate of the fiber structure is 80% or more.

In the present invention, the fiber structure can be used for medical treatment.

(Effects of the Invention)

According to the present invention, a fibrous structure is obtained that is more excellent in heat retention than a conventional product, and also excellent in wearing comfort as an inner such as an inner t-shirt or a t-shirt. Moreover, according to this invention, the medical | medical material which is excellent in the heat retention and wearing comfort which use the said fiber structure is obtained.

In the present invention, the viscose rayon fiber adsorbs water vapor generated from the human body, and the heat generated by converting the kinetic energy of the water molecules into heat energy is formed between the polyacrylic synthetic fiber and the fibers of the brushed surface and the fiber. Warmth can be maintained by the insulation effect of the air pocket.

Next, embodiment of the fiber structure of this invention is described in detail.

The fiber structure of this invention is more than 15 mass% less than 40 mass% of viscose rayon fiber, more than 10 mass% less than 45 mass% of cationic salt polyester long fiber, more than 25 mass% less than 60 mass% of polyacrylic synthetic fiber, And a fiber structure comprising polyurethane-based elastic fibers in a proportion of more than 3% by mass and less than 15% by mass, and a fiber structure having hairs on the front or back surface thereof.

The fiber structure of this invention contains a viscose rayon type fiber in the ratio of more than 15 mass% and less than 40 mass%. By containing viscose rayon-based fibers in this ratio, a fiber structure having excellent hygroscopic exothermicity can be obtained. Since the fibrous structure has hygroscopic exothermic properties, the fibrous structure may generate heat by steam generated from the human body at the time of wearing, thereby increasing the clothing temperature. When the ratio of viscose rayon-based fibers is 40% by mass or more, there is a problem that wrinkles easily occur after washing due to the characteristics of the viscose rayon-based fibers. In addition, when the viscose rayon fiber is 15% by mass or less, the hygroscopic exothermic characteristics as the fiber structure are not sufficiently expressed.

The proportion of the viscose rayon fibers is preferably 15 to 30% by mass, more preferably 15 to 25% by mass. By containing more than 15 mass% of viscose rayon fibers, a fiber structure having more excellent hygroscopic exothermic properties can be obtained.

As a viscose rayon type fiber used by this invention, it is preferable embodiment to use it as a spinning yarn from a viewpoint of improving heat retention. In this case, the number of yarns of the spun yarn is preferably 30S to 100S in terms of the number of cotton in terms of being preferably used in underwear, t-shirts, or the like directly touching human skin. More preferably, cotton yarns of 30S to 60S are used from the viewpoint of the thickness and the heat retention of the fiber structure.

Moreover, it is preferable that the short fiber fineness which comprises a spun yarn is 0.5 dtex-2.5 dtex from the use use.

The viscose rayon fiber referred to in the present invention is a regenerated fiber spun by the viscose method, and is a short fiber indicating viscose rayon and saponified acetate.

The fiber structure of this invention contains cationic salt polyester long fiber in the ratio of more than 10 mass% and less than 45 mass%. By using a cationic salt polyester long fiber, it becomes possible to dye with the same dye as a polyacrylic synthetic fiber in that it can dye at low temperature compared with normal polyester fiber. In addition, since the cationic salt polyester long fiber has excellent color development and fastness at a temperature of 105 ° C to 115 ° C, deterioration due to heat of the polyurethane-based elastic fiber can be prevented.

Moreover, generation | occurrence | production of the wrinkle after washing of a fiber structure is suppressed by containing more than 10 mass% of cationic salt polyester fiber. When the ratio of the cationic salt polyester long fiber is 45% by mass or more, the hygroscopic exothermic property of the fiber structure is deteriorated due to the properties of the cationic salt polyester fiber. Moreover, when cation salt polyester long fiber is 10 mass% or less, there exists a tendency for wrinkles to remain easily when washing a fiber structure.

The proportion of the cationic salt polyester long fiber is preferably 20 to 40% by mass, more preferably 20 to 35% by mass.

In the production of the cationic salt polyester long fibers in the present invention, a known production method of polyester is usually used. In addition, in order to cation-chloride normal polyester, it is achieved by copolymerizing 1.0-3.0 mol% of 5-sodium sulfoisophthalic acid components to polyester as usual, for example, as is generally known.

The total fineness of the long fiber yarns made of cationic salted polyester long fibers used in the present invention is preferably 50 dtex to 200 dtex in terms of being used in underwear, t-shirts, and the like directly touching human skin. More preferably, it is 60-180 dtex, and especially preferable total fineness is the range of 70-160 dtex. Cationic salted polyester long fibers used in the present invention is preferably a filament number of 36 to 192 long fibers as the multi-filament of the polyester.

The fiber structure of this invention contains polyacrylic synthetic fiber in the ratio of more than 25 mass% and less than 60 mass%. By containing 25 mass% or more of polyacrylic-type synthetic fibers, heat retention can be provided to a fiber structure. When the ratio of the polyacrylic synthetic fiber is 60% by mass or more, the moisture absorption exothermicity is lowered because the moisture retention of the fiber structure is lowered due to the characteristics of the polyacrylic synthetic fiber. Moreover, when polyacrylic synthetic fiber is 25 mass% or less, heat retention is not fully expressed at the point that the mixing rate in the fiber structure of the microacryl which expresses a heat insulation effect falls.

The preferable ratio of polyacrylic-type synthetic fiber is 30-55 mass%, More preferably, it is the range of 35-50 mass%.

It is preferable that the short fiber fineness of the polyacrylic-type synthetic fiber used by this invention is 0.6-2.2 dtex. Although it is preferable to use a fineness for softer touch and heat retention improvement, when single fiber fineness is less than 0.6 dtex, the spinning property may become difficult, and there exists a possibility of causing the strong fall of a spun yarn. In addition, when the short fiber fineness exceeds 2.2 dtex, there is a tendency that the touch becomes stiff, especially for inner wear worn directly on the skin. In this regard, the short fiber fineness of the polyacrylic synthetic fibers is more preferably 0.6 dtex or more and 1.5 dtex or less.

As a polyacrylic synthetic fiber used by this invention, what is used as a spinning yarn from a viewpoint of improving heat retention is preferable. In this case, the number of yarns of the spun yarn is preferably 30S to 100S in terms of the number of cotton in terms of being used in underwear, t-shirts, and the like directly in contact with human skin. More preferably, cotton yarns of 30S to 60S are used from the viewpoint of the thickness and the heat retention of the fiber structure. Fiber lengths are used in the general 38-52 mm range.

Moreover, in this invention, the spun yarn which mixed the said viscose rayon type fiber and / or polyacrylic type synthetic fiber to this polyacrylic synthetic fiber is also used preferably. The polyacrylic fiber in the present invention refers to a copolymer of or addition of another compound based on an acrylic composition in addition to the regular type polyacrylic fiber made of polyacrylonitrile, and refers to a polyacrylic fiber modified to an anti-pilling type or an absorbent type. Include.

The fiber structure of this invention contains polyurethane-based elastic fiber in the ratio of more than 3 mass% and less than 15 mass%. As a result, the gap between the proper elongation and the letter loop can be increased, thereby smoothly following the movement of the body, thereby improving the wearing comfort. The proportion of polyurethane-based elastic fibers is preferably 4 to 13% by mass, more preferably 4 to 12% by mass.

As the polyurethane-based elastic yarn used in the present invention, the elastic recovery rate at 200% elongation is preferably 90% or more. If the elastic recovery rate at 200% elongation is less than 90%, there is a fear that the letter will increase to the end for repeated wearing. In addition, the knitting structure and the density can be arbitrarily set according to the intended use.

As the polyurethane-based elastic fiber used in the present invention, the total fineness as the fiber yarn is preferably 15 dtex to 50 dtex, more preferably in the range of 20 to 45 dtex, since it is used in underwear, t-shirts, or the like directly touching human skin. Further, polyurethane-based elastic fibers are usually used as long fibers (filaments), and polyurethane-based elastic fibers of 1-3 filaments are preferably used as the number of filaments.

Also, in the fiber structure of the present invention, it is important to have the hairs on the surface or the back side of the fiber structure. By raising the surface layer of the fibrous structure by raising the napping process to form hair, the excellent heat retention can be realized. It is more preferable that a cation salt polyester long fiber appears to the surface layer mainly as a surface to brush. When the short fibers brush the side of the surface of the fiber structure, fluff may be generated by cutting the short fibers.

Moreover, it is preferable embodiment from a viewpoint of suppressing fluff generation that short fiber fineness of a cationic salted polyester long fiber is 0.6 dtex or more. When the short fiber fineness is less than 0.6 dtex, fluff may occur in the raising process similarly to the said short fiber. In addition, the short fiber fineness of the cationic salted polyester long fiber is preferably 6.0 dtex or less, more preferably 0.8 to 5.5 dtex in terms of being used in underwear, t-shirts, and the like directly in contact with human skin.

The fiber structure in this invention can mention a knitted fabric suitably. In addition, although viscose rayon fiber and polyacrylic synthetic fiber can use either long fiber or short fiber, as a preferable form of a fiber structure, it is used for underwear, a t-shirt, etc. which directly touches a skin, and in order to achieve various performances, a viscose rayon fiber And a knitted yarn comprising a spun yarn mixed with a polyacrylic synthetic fiber, a cationic salt polyester long fiber, and a polyurethane elastic fiber.

The fibrous structure of the present invention preferably consists of a two-layered letter. If the fiber structure has a single layer structure, the dough is thin and tends to lack heat retention, and in addition, fluff may occur because short fibers are mixed on the brushed surface. Moreover, when a fibrous structure has a three-layer structure or more, it may be thick and unsuitable for inner uses, such as a t-shirt and underwear. Therefore, in order to make heat insulation compatible with suppression of fluff generation, the letter of 2 layer structure is especially preferable embodiment. The letter of the two-layer structure in the present invention is a knitted fabric formed by a circular knitting machine having a double cylinder. For example, structures such as smooth, double jacquard, double piqué, and ponti roman are suitably used.

The preferred thickness of the fiber structure of the present invention is in the range of 1.30 to 1.80 mm.

It is preferable that the fibrous structure of the present invention has a performance of 20% or more. The higher the heat retention rate is, the more preferable. If the heat retention rate is 20% or more, the user may feel warm when worn. The heat retention rate is an indicator of whether the dough is easy to diffuse or difficult to spread. If the ratio of the cationic salt polyester long fiber or polyacrylic synthetic fiber with low thermal conductivity is increased due to the characteristics of the fiber, the heat retention rate is improved, but the hygroscopic exothermic property is lowered. More preferable thermal insulation rate is 25% or more.

In this invention, it is further preferable that the hygroscopic exothermic performance of the fiber structure of this invention is 2.2 degreeC or more. The higher the hygroscopic exothermic performance is, the more preferable, and when the hygroscopic exothermic performance is 2.2 ° C. or more, it can feel warm when worn. The hygroscopic exothermic performance refers to the surface temperature A when the sample temperature is stabilized by feeding dry air (humidity 10% RH or less) passed through a silica gel container and drying the sample for 30 minutes or more. The sample surface temperature highest achieved temperature B is read while air of about 90% RH which has passed through for about 30 minutes is read, and it is the temperature of the difference BA (degreeC). Therefore, if the proportion of viscose rayon-based fibers with high moisture absorption performance is increased, the moisture absorption exothermic performance is increased. However, if the ratio of viscose rayon-based fibers is increased, wrinkles are liable to occur after washing due to the characteristics of the viscose rayon-based fibers, and the heat retention is low.

In the fiber structure of the present invention, the surface or back surface of the fiber structure is subjected to brushing to form hair, but the fluff adhesion of the brushed surface of the hair is preferably 4.0 or higher. The fluff attachment performance is an indicator of whether the fluff on the thin fibrous structure resulting from brushing is likely to adhere to other garments when worn or difficult to attach. When filaments of short fibers or short fiber fine fibers are mainly raised, there is a tendency that the threads are cut and fluff tends to occur. In the present invention, from the viewpoint of suppressing the occurrence of fluff, short fiber fineness is a preferred embodiment of raising the surface on which the cation salt polyester long fibers of 0.6 dtex or more appear on the surface layer.

Moreover, in the fiber structure of this invention, it is preferable that elongation recovery rate is 80% or more. Elongation recovery rate is the numerical value of the characteristic which is left to stand after extending | stretching a dough by a fixed load, and trying to return to original size. If the recovery rate is less than 80%, clothing may increase after wearing and the size of clothing may not match when worn again.

In addition, in the fiber structure of the present invention, a third component is added to the conventional polyester fiber or polyester which is not cationic salt other than the viscose rayon fiber, cationic salt polyester long fiber, polyacrylic synthetic fiber, and polyurethane elastic fiber. Polyester fiber copolymerized with the above, polyamide fiber, acetate fiber, natural cellulose fiber such as cotton, hemp, pulp, regenerated cellulose fiber other than viscose rayon, protein fiber such as wool, and the like can also be used. The fibers constituting the fiber structure are used in one form of blend, blend, blend, and interlacing.

Example

Next, the fiber structure of this invention is demonstrated concretely based on an Example. Here, the evaluation method of each performance in an Example etc. is as follows.

(1) hygroscopic exothermic:

The hygroscopic pyrogenic property attaches a sample of about 10 cm × 10 cm in a sealed container, and attaches a surface thermometer sensor so that the temperature of the sample can be measured. After starting the measurement of the temperature of the sample, the sample is dried by feeding dry air (humidity of 10% RH or less) that has passed through the silica gel container from the room temperature of 20 ° C. or less. The sample surface temperature reached at the maximum surface temperature while the sample was dried for at least 30 minutes, and the surface temperature A when the sample temperature was stabilized was then supplied with about 90% RH of air having a humidity of about 90% RH. B was read and the difference BA was called moisture absorption exothermic performance (degreeC).

(2) fluff adhesion:

The fluff adhesion test is measured according to the cellophane tape method. It mounts so that the adhesive surface of a cellophane tape may contact the horizontal direction of the napped surface of a sample, and it is left to stand for 5 second by applying a load so that a pressure may be 3.9 kpa. The cellophane tape is peeled off gently, and the same operation is repeated five times at different locations. The cellophane tape used is Nichiban Co., Ltd. having a width of 18 mm. Use part no. CT-18 / LP-18. The determination rapidly determines the amount of fluff attached to the cellophane tape compared to the standard scale.

(3) kidney recovery rate:

Elongation recovery rate is measured according to JIS L1096 (2010) 8.16.2 B-1 method. Although the recovery rate in this measurement measures the recovery rate after 30 seconds and after 1 hour, the recovery rate in the present invention represents the recovery rate after 1 hour.

(4) thermal insulation rate:

The heat retention rate is measured according to JIS L1096 (2010) 8.27 heat retention 8.27.1 A method (constant temperature method).

(Example 1)

30 mass% of viscose rayon staples (1.4 dtex, 38 mm) and 70 mass% of polyacrylic fiber staples (1.0 dtex, 45 mm) were mixed with a card mix to obtain a 30 s yarn.

The spun yarn, cationic salt polyester long filament (84dtex-72 filament), and polyurethane-based elastic fiber (44dtex-2 filament) obtained in this manner were double-knit knitting machines having a kiln diameter of 76.2 cm and a gauge number of 18/2 / 2.54 cm. By virtue of the above, raw materials were obtained.

The vitality thus obtained was processed by a process of heat set (185 ° C., 30 seconds), brushing, refining (70 ° C.), dyeing (115 ° C.), drying (130 ° C.), and heat set (130 ° C.). The brushing process performed only the cotton in which the cation salt polyester long fiber appeared in the surface layer, and obtained dough (fiber structure). As a result, dough (fiber structure) of 45 mass% of polyacrylic fiber, 23 mass% of viscose rayon, 27 mass% of cationic salt polyester long fibers, 5 mass% of polyurethane-based elastic fibers, and 330 g / m 2 of dough mass was obtained.

The heat retention rate of the dough obtained in the said Example 1 was evaluated. The results are shown in Table 1. A fibrous structure having a high function as an inner wear is obtained, which is also good in hygroscopic heat generation, lint adhesion, elongation recovery, and heat retention rate.

(Example 2)

30 mass% of viscose rayon staples (1.4 dtex, 38 mm) and 70 mass% of polyacrylic fiber staples (1.0 dtex, 45 mm) were mixed with a card mix to obtain a 40 s yarn.

The spun yarn thus obtained, the cationic salt polyester long filament (84dtex-96 filament), and the polyurethane-based elastic fiber (44dtex) were interlaced with a double knit knitting machine having a kiln diameter of 76.2 cm and a gauge number of 18 / 2.54 cm. Got vitality.

The vitality thus obtained was processed by a process of heat set (185 ° C., 30 seconds), brushing, refining (70 ° C.), dyeing (115 ° C.), drying (130 ° C.), and heat set (130 ° C.). The brushing process performed only the cotton in which the cation salt polyester long fiber appeared in the surface layer, and obtained dough (fiber structure). As a result, 42 mass% of polyacrylic fiber, 18 mass% of viscose rayon, 31 mass% of cationic salt polyester, 9 mass% of polyurethane-type elastic fibers, and the dough (fiber structure) of 280 g / m <2> of mass of dough were obtained.

The heat retention rate of the dough obtained in the said Example 2 was evaluated. The results are shown in Table 1. As in Example 1, a highly functional fiber structure is obtained. Although the dough mass is 50g / m2 lighter than that of Example 1, by shortening the short fiber fineness of the cationic salted polyester long fibers, the raised surface becomes more fluff, and even if the dough mass is light, a fibrous structure having equivalent heat retention is obtained. .

(Example 3)

30 mass% of viscose rayon staples (1.4 dtex, 38 mm) and 70 mass% of polyacrylic fiber staples (1.0 dtex, 45 mm) were mixed with a card mix to obtain a 40 s yarn.

The spun yarn thus obtained, the cationic salt polyester long fiber (84dtex-72 filament), and the polyurethane-based elastic fiber (44dtex) were interlaced with a double knit knitting machine having a kiln diameter of 76.2 cm and a gauge number of 18 / 2.54 cm. Got vitality.

The vitality thus obtained was processed by a process of heat set (185 ° C., 30 seconds), brushing, refining (70 ° C.), dyeing (115 ° C.), drying (130 ° C.), and heat set (130 ° C.). The brushing process performed only the cotton in which the cation salt polyester long fiber appeared in the surface layer, and obtained dough (fiber structure). As a result, 42 mass% of polyacrylic fiber, 18 mass% of viscose rayon, 31 mass% of cationic salt polyester long fibers, 9 mass% of polyurethane-based elastic fibers, and dough (fiber structure) of 300 g / m2 of dough mass were obtained.

The heat retention rate of the dough obtained in the said Example 3 was evaluated. The results are shown in Table 1. In the same manner as in Examples 1 and 2, those having high heat retention can be obtained. In Example 1, the fineness of the yarn was lightened, and the dough mass was lightened, but the fiber structure which has a high heat retention as an inner wear with a heat retention rate of 31% is obtained.

(Comparative Example 1)

In Example 1, a dough (fiber structure) was obtained in the same manner as in Example 1 except that a yarn was obtained using only acrylic staples without using viscose rayon staples as a yarn. As a result of evaluating similarly using the obtained dough (fiber structure), as shown in Table 2, it was confirmed that heat insulation is inferior to hygroscopic heat generation.

(Comparative Example 2)

In Example 1, only the spun yarn and the polyurethane-based elastic fiber were interlaced without using a cationic salt polyester long fiber. In addition, the brushing process was performed about the surface in which the spun yarn appeared in the surface layer. Otherwise, the dough (fiber structure) was obtained in the same manner as in Example 1. As a result of evaluating similarly using the obtained dough, as shown in Table 2, it was confirmed that although thermal insulation is inferior to fluff adhesion.

(Comparative Example 3)

In Example 1, a dough (fiber structure) was obtained in the same manner as in Example 1 except that a yarn was obtained using only viscose rayon staples without using acrylic staples as a yarn. As a result of evaluating similarly using the obtained dough, as shown in Table 2, although it was hygroscopic exothermicity, it was confirmed that heat retention is inferior.

(Comparative Example 4)

In Example 1, the dough (fiber structure) was obtained in the same manner as in Example 1 except that only the yarn was spun and the cation salt polyester long fiber was not used. As a result of evaluating similarly using the obtained dough, as shown in Table 2, although it was heat retention, it was confirmed that elongation recovery is inferior.

(Comparative Example 5)

The dough (fiber structure) was obtained like Example 3 except not having brushed in Example 3. As a result of evaluating similarly using the obtained dough, as shown in Table 2, it was confirmed that heat retention is inferior.

(Industrial availability)

The fibrous structure of the present invention is not particularly limited as long as it is medical to be attached to a body other than medical clothing such as a t-shirt, jacket, slacks, skirt, and the like, and tights, spats, camisole, and pants, and the like. Used.

Claims (8)

More than 15% by mass and less than 40% by mass of viscose rayon fibers, more than 10% by mass and less than 45% by mass of cationic salt polyester long fibers, more than 25% by mass and less than 60% by mass of polyacrylic synthetic fibers, and polyurethane-based elastic fibers A fiber structure comprising at least 3% by mass and less than 15% by mass, and having a hair structure on its surface or back surface. The method of claim 1,
A fiber structure in which the fiber structure consists of a letter of a two-layer structure. The method according to claim 1 or 2,
A fiber structure in which the short fiber fineness of the cationic salted polyester long fibers is 0.6 dtex or more. The method according to any one of claims 1 to 3,
Fiber structure with a heat retention rate of 20% or more. The method according to any one of claims 1 to 4,
A fiber structure having a hygroscopic exotherm of 2.2 ° C or higher. The method according to any one of claims 1 to 5,
A fibrous structure having a fluff adhesion of at least 4.0 with cotton. The method according to any one of claims 1 to 6,
Fiber structures with an elongation recovery above 80%. The medical treatment which uses the fiber structure as described in any one of Claims 1-7.