JPH1077570A - Production of fibrous structure comprising cellulose multifilament and cotton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fibrous structure retaining the mechanical strength of the cellulose filaments as one of the constituents, excellent in surface grade, gloss and touch feeling, and useful as e.g. inner wear, by chlorine bleaching treatment of a fibrous structure comprising each specified amount of specific Lyocell fiber and cotton. SOLUTION: This fibrous structure is obtained by chlorine bleaching treatment using e.g. sodium chlorite of a fibrous structure comprising >=30wt.% cotton and >=20wt.% Lyocell fiber as cellulose multifilaments produced by the use of an organic solvent such as N-methylmorpholine N-oxide and having a dry tenacity of 3-5g/d and a dry elongation at break of 5-10%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a fibrous structure containing cellulose multifilaments and cotton.

[0002]

2. Description of the Related Art Conventionally, cotton has been combined with regenerated cellulose multifilaments in order to give a cotton product a gloss and a feeling peculiar to cellulose filaments.
However, when chlorine bleaching is performed for the purpose of removing cotton husks, the surface quality of the fibrous structure can be improved, but the strength of the regenerated cellulose multifilament decreases, and there is a problem in practical use.

[0003] In order to maintain the strength of regenerated cellulose multifilaments, sodium hypochlorite or sodium chlorite was reduced in concentration or bleached with hydrogen peroxide. However, it is not possible to obtain a sufficient product, and in addition, the cost is extremely high and the quantity is limited in the case of compounding with cotton that has been bleached. There is a need for a processable fibrous structure.

[0004] Heretofore, a fiber structure containing cotton multifilament and cotton, which has been subjected to post-processing bleaching treatment, has excellent surface quality, and has the gloss and texture peculiar to cellulose filament, has not been obtained.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for subjecting a fibrous structure containing cellulose multifilaments and cotton to post-processing by bleaching.

[0006]

According to the present invention, there is provided a process for subjecting a fibrous structure containing cellulose multifilaments and cotton to a bleaching treatment, wherein the cellulose multifilament has a dry strength of 3 to 5 g / d and a dry elongation of 3%. A fiber containing cellulose multifilament and cotton, characterized by containing 5 to 10% of lyocell fiber in an amount of 20% by weight or more, and containing the cotton in an amount of 30% by weight or more to form a fibrous structure, followed by chlorine bleaching treatment. Manufacturing method of the structure.

The present invention achieves the above object only by using a multifilament of lyocell fiber having a dry strength of 3 to 5 g / d and a dry elongation of 5 to 10%. More preferably, the lyocell fiber has a dry strength of 3 to 4 g / d and a dry elongation of 7 to 10%. When the multifilament of the lyocell fiber has a dry strength of less than 3 g / d and a dry elongation of more than 10%, the strength of the lyocell fiber decreases during bleaching of the fiber structure, which is not preferable. Further, the multifilament of lyocell fiber has a dry strength exceeding 5 g / d and a dry elongation of 5 g / d.
%, The yarn breakage often occurs, which is not preferable in terms of the structure of the fiber structure and the production process.

In the present invention, the term "lyocell fiber" refers to a cellulose fiber obtained by dissolving cellulose in an organic solvent to prepare a cellulose solution, and using this solution as a spinning solution by wet spinning or dry spinning. As described in JP-B-60-28848, for example, a lyocell fiber is prepared by spinning a solution containing a cellulose and a non-solvent such as water dissolved in an organic solvent in the air or in a non-precipitating medium. Pull the fiber forming solution coming out of the die faster than the spinning speed,
It is obtained by stretching with a stretching ratio of 3 times or more and then treating with a non-solution.

The organic solvent of cellulose may be a known solvent for the lyocell fiber used in the present invention. Examples thereof include amine oxides disclosed in Japanese Patent Publication No. 28848/1985. You may. In the production of lyocell fiber, amine oxides used as an organic solvent include, for example, cyclic mono (N-methylamine-N-oxide) such as N-methylmorpholine N-oxide; tertiary amine N-oxide (eg, trimethylamine Of triethylamine, tripropylamine,
Oxide of monomethyldiethylamine, of dimethylmonomethylamine, of monomethyldipropylamine);
Oxides of dimethyl-, N-diethyl-, N-dipropylcyclohexylamine; pyridine oxides and the like. The use of N-methylmorpholine N-oxide is preferred.

[0010] The lyocell fiber used in the present invention is a filament composed of a plurality of single fibers, and the thickness, cross-sectional shape, etc. of the single fiber are not particularly limited. In general, the total denier of the filament used as a fiber structure is in the range of 20d to 300d, and is preferably 0.5 to 10d for single fiber denier, more preferably 1 to 2.5d. ,
With respect to the number of single fibers of the multifilament, a fiber having a smaller number of filaments than a high multifilament has a higher glossiness.

In the present invention, the content of lyocell fiber is at least 20% by weight to 70% by weight of the fibrous structure, preferably 30% by weight to 60% by weight, more preferably 40% by weight to 50% by weight. % Or less. When the content is 20% by weight or more, a fiber structure having characteristics of cellulose multifilament, for example, glossiness, sharpness, and the like can be obtained.

As the cotton, any of unbleached cotton, non-mercerized cotton, mercerized cotton, carded cotton, combed cotton and the like can be used, and the thickness, count, spinning conditions and the like of the fibers are not particularly limited. When gloss and swelling are required, mercerized cotton is preferred. The content of cotton is in the range where bleaching needs to be performed and the characteristics of cotton can be exhibited, that is, 30% by weight or more and 80% by weight or more.
The content is preferably 40% by weight or more and 70% by weight or less, more preferably 50% by weight or more and 60% by weight or less. 30
If it occupies at least% by weight, it is possible to obtain a fiber structure having an effect unique to cotton, for example, a feeling of swelling.

In the present invention, the fiber structure may contain bleached cotton, if necessary. However, the bleaching of the bleached cotton may cause a decrease in strength. Therefore, it is preferable to keep the content of the fiber structure to such an extent that the strength of the fibrous structure itself is not reduced. There is no particular limitation on the method of inclusion. In the present invention, the method of incorporating cellulose multifilament and cotton is carried out by compound spinning, for example, spinning and twisting, blending, for example, interlace blending, interlaced weaving, needle punching or spunlace between nonwoven fabrics, cellulose filament nonwoven fabric and cotton. Any of sliver and spunlace composites may be used.

In the present invention, the term "fiber structure" refers to a yarn, a nonwoven fabric, a knitted fabric or the like. In the method of the present invention for subjecting a fibrous structure containing cellulose multifilaments and cotton to bleaching treatment, the cellulose multifilaments are added in an amount of 20% by weight or more.
If cotton is contained in an amount of 30% by weight or more, acetate, ester, nylon, acrylic, polyurethane-based elastic fiber, polypropylene, polyvinyl chloride, polyvinylidene chloride, anti-pill property, etc. are modified as necessary. One or more types of conventionally known various fibers other than regenerated cellulose, such as modified fibers, may be contained by blend spinning, composite spinning, twisting, knitting or the like.

The conditions for the chlorine bleaching treatment in the production method of the present invention will be described. It is preferable to use sodium chlorite, sodium hypochlorite as the treating agent for chlorine bleaching treatment,
Further, it is preferable to use sodium hypochlorite. Sodium hypochlorite is easy to improve the surface quality of the fibrous structure, has a wide usable concentration range, and is easy to manage.

The concentration of the treating agent in the chlorine bleaching treatment of the present invention depends on the color density in the dyeing step after chlorine bleaching. For example, in the case of a white or light color tone requiring particularly whiteness or the requirement of complete removal of cotton husk, the concentration of the treating agent is preferably 10 g / liter to 30 g / liter, more preferably 15 g / liter. / Liter or more 30g /
At liters or less, higher concentrations are particularly effective.

The treatment temperature for chlorine exposure is preferably from 20 ° C. to 60 ° C., more preferably from 30 ° C. to 50 ° C., and the treatment time is preferably from 15 minutes to 120 minutes, more preferably from 30 minutes to 90 minutes. . Temperatures above this range,
In the case of time, the strength of both lyocell fiber and cotton may be reduced, and if the temperature and the treatment time are lower than this range, the bleaching effect is not sufficiently exhibited.

For dechlorination, it is preferable to use hydrosulfite or sodium thiosulfate. The concentration is preferably 1 to 5 g / liter, more preferably 1.5 to 3 g / liter, and the temperature is preferably low temperature of about 20 to 50 ° C, more preferably 30 to 45 ° C for about 10 to 30 minutes. preferable. In the production method of the present invention, a yarn obtained by mixing cotton and multi-filament of lyocell fiber is subjected to chlorine bleaching treatment with sodium hypochlorite, and then to a knitted fabric or the like, the knitted fabric is treated with chlorine by sodium hypochlorite. Similar effects can be obtained by performing the bleaching process.

When rebleaching is performed with hydrogen peroxide, the surface quality of the fiber structure is further improved. The concentration is preferably 1 to 2 g / liter, the processing temperature is 80 to 95 ° C., and the processing time is 30 to 60 minutes, and the surface quality can be improved without lowering the strength. Further, the production method of the present invention is not affected at all, even when performing, for example, sintering, mercerizing, scouring, etc. as a pre-process of chlorine bleaching treatment, and has an adverse effect on dyeing and finishing after bleaching. Never.

The use of the fibrous structure obtained by the production method of the present invention includes innerwear such as underwear, inch mates and garments, outerwear, socks, towels, rugs,
Sheets, sheets covers, puffs for makeup, gauze, gloves,
Examples include white coats, bandages, filters, industrial sanitary clothes, blankets, and mufflers.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments. In addition, physical property evaluation was performed as follows. (1) Yarn strength and elongation: Measured in accordance with JIS-L-1013. (2) Yellowness: measured according to JIS-K-7103.

(3) Tear strength of woven fabric; JIS-L-10
97.

[0023]

Example 1 First, lyocell fiber was obtained from Tokiko Sho 60-28
It was manufactured according to the manufacturing method described in Example 1 of JP-A-848. The pulp and the N-morpholine N-oxide aqueous solution were put in a mixing tank and mixed under reduced pressure to produce a cellulose solution having a cellulose concentration of 10.0%. The cellulose solution was subjected to air gap spinning at a discharge temperature of 124 ° C. under the conditions shown in Table 1. The spun yarn was scoured by washing with water, dried and wound up to obtain a 75d / 50f multifilament having the physical properties shown in Table 1.

The multifilament obtained Table 1 (test yarn) in the warp, and the cotton spun yarn 30 ^'S of the cotton count in the weft, warp density 150 yarns / inch, weft density 55 yarns / inch flat The woven fabric was woven and subjected to chlorine bleaching treatment under the following conditions. Chlorine bleaching treatment conditions Pre-scrutiny: Nonionic surfactant 2 g / liter, 80
℃, 20 minutes chlorine exposure: sodium hypochlorite 20g / l, 30
60 ° C., bath ratio 1:20, water washing Dechlorination: sodium thiosulfate 2.0 g / liter, 40
C, 15 minutes water washing The yellowness of the woven fabric after the chlorine bleaching treatment was 1-3, and the cotton husk was completely removed. Next, after dyeing under the following conditions, drying was performed.

Dyeing Processing Conditions Dye: Vinyl sulfone-based reactive dye Sumifix Navy Blue GS 1% owf Sodium sulfate: 50 g / l Sodium carbonate: 15 g / l Temperature: 60 ° C. Bath ratio: 1:15 Time: 60 minutes The obtained fabric The tear strength in the longitudinal direction was measured.
There was no problem with 500 g, and the texture and glossiness of the cellulose filament were obtained.

[0026]

Example 2 A 75d / 50f multifilament obtained in Example 1 was twisted into S-twisted and Z-twisted yarns having a twist number of 1200 T / m in the order of S, S, Z, and Z into a warp yarn, and 30 ^′. A plain woven fabric having a warp density of 130 yarns / inch and a weft density of 60 yarns / inch was woven using the cotton spun yarn of ^S as the weft yarn, and subjected to chlorine bleaching treatment under the same conditions as in Example 1.

The woven fabric subjected to the chlorine bleaching treatment has a yellowness of 1 to 3.
And the cotton husk was completely removed. Next, Example 1
Dyeing was carried out under the same conditions as described above, and drying was performed. The obtained fabric had a tear strength in the longitudinal direction of 1900 g, and there was no problem in practical use, and a woven fabric having a crisp feel and a glossy feel of the cellulose filament was obtained.

[0028]

Comparative Example 1 The woven fabric obtained in Example 1 was exposed to hydrogen peroxide under the following conditions. Conditions for exposure to hydrogen peroxide Pre-scrutiny: Nonionic surfactant 2 g / liter, 80
20 ° C., 20 minutes hydrogen peroxide exposure: hydrogen peroxide 5 g / l, caustic soda 2 g / l, boil, 60 minutes, bath ratio 1:20, water washing Dehydrogenation: acetic acid 3 g / l, 60 ° C., 20 minutes water washing The yellowness of the fabric was 10, and some cotton husks remained.

Next, dyeing was carried out under the same conditions as in Example 1,
Drying was performed. When the tear strength in the longitudinal direction of the obtained woven fabric was measured, there was no problem with the woven fabric having a weight of 1000 g, and a feeling and glossiness unique to cellulose filaments were obtained, but the cotton husk remained on the surface.

[0030]

[Table 1]

[0031]

According to the production method of the present invention, despite the method of post-exposing cotton, there is no decrease in the strength of the cellulose filament, the surface quality is excellent, and the luster and texture peculiar to the cellulose filament as compared with the conventional method. A fibrous structure containing cellulose filaments and cotton having

Claims (1)

[Claims] 1. A method for subjecting a fibrous structure containing cellulose multifilaments and cotton to bleaching treatment, wherein the cellulose multifilament has a dry strength of 3 to 5 g / g.
d. Cellulose multifilament comprising a lyocell fiber having a dry elongation of 5 to 10% in an amount of 20% by weight or more, and the above-mentioned cotton in an amount of 30% by weight or more to form a fibrous structure, followed by chlorine bleaching treatment. For producing a fibrous structure containing cotton and cotton.