JP2001303375A - Composite elastic yarn and method for producing the same - Google Patents

Abstract

(57) [Problem] To provide a composite elastic yarn having stretchability, high covering properties, and good bulkiness and a span-like texture and appearance.
And a method for producing the same. SOLUTION: At least one kind of elastic yarn (A) is a composite elastic yarn having a core portion and at least one kind of inelastic multifilament forming a sheath portion. (B) and the outer filament (C) are entangled with each other, and the yarn length difference is 1.0
5 ≦ C / B ≦ 1.50, (B) and (C) in the composite elastic yarn form a substantially uniform sheath portion, and the composite elastic yarn has fine loop fluff on the surface layer. And a method of manufacturing a composite elastic yarn by feeding the above (A), (B), and (C) together to an air nozzle to form a loop entanglement, and then winding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite elastic yarn, and more particularly, to a composite elastic yarn having stretchability, high covering properties, good bulkiness, and a span-like texture and appearance, and its production. About the method.

[0002]

2. Description of the Related Art In order to obtain a composite elastic yarn having a spun tone texture, appearance and bulkiness with little glare and metallic luster, it is important to use a spun-like yarn. Covering the elastic yarn with a spun-like yarn is important. It is generally done. Conventionally, as a method for producing a spun-like yarn having elasticity, for example, JP-A-60-2736
Japanese Patent Application Laid-Open Publication No. H11-163,086 discloses a method in which an elastic yarn and a crimped yarn made of an inelastic filament which have been drawn in advance are simultaneously entangled with a fluid processing nozzle.

Japanese Patent Application Laid-Open No. 6-316826 discloses a stretched elastic yarn as a core yarn, an intermediate layer of an ester crimped yarn, which is immiscible with an ionic dye, and an outer layer of the elastic yarn. A dyeable ester crimped yarn is arranged around the ionic dye and wound in an alternating twisted yarn.Each filament is entangled between the elastic yarn and the intermediate layer and between the intermediate layer and the outer layer by a turbulent airflow. After imparting a confounding degree of 60 to 120 pieces / m,
A method for simultaneous false-twisting is disclosed.

[0004] However, in each of these methods, although elasticity is obtained because the elastic yarn is used as the core yarn, turbulent air entanglement (so-called interlacing) of the elastic yarn and the crimped yarn or turbulent air entanglement is performed. After that, it is a method of false twisting, and although the bulkiness is excellent compared with the long fiber, the bulkiness is significantly inferior in comparison with the spun yarn, and the stretchable spunlike yarn which is satisfactory in terms of appearance and texture is obtained. Not been.

Further, in the manufacturing process, stress is concentrated only on the elastic yarn, and yarn displacement and stitching (a phenomenon in which the elastic yarn is exposed due to the displacement of the covering yarn due to cutting of the elastic yarn and unevenness of the elongation) occur, and the fabric and In such a case, there are disadvantages such as impairing the appearance of the product. As described above, at present, a fabric having sufficient bulkiness has not been obtained from a composite yarn having an elastic yarn as a core yarn and an inelastic yarn as a sheath yarn.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a composite elastic yarn which is stretchable, has a high covering property without a yarn slippage and a stickiness phenomenon, and has a bulky and rich span-like texture and appearance. And a method for producing the same.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have intensively studied a method of combining an elastic yarn and an inelastic yarn, and as a result, have found that at least one elastic yarn and at least one non-elastic yarn are combined. The present inventors have found that it is effective to entangle the elastic filaments and to give specific fine loop fluff to the surface of the composite elastic yarn, and have accomplished the present invention.

That is, the present invention is as follows. (1) A composite elastic yarn in which at least one type of elastic yarn (A) forms a core portion and at least one type of inelastic multifilament forms a sheath portion. B) and the outer filament (C) are entangled with each other, and the yarn length difference is 1.05 ≦ C / B
≦ 1.50, wherein the composite elastic yarn (B) and (C) form a substantially uniform sheath, and the composite elastic yarn has fine loop fluff on the surface layer. .

(2) The composite elastic yarn according to the above (1), wherein the elongation after treatment at 90 ° C. for 20 minutes at a moist heat is 100% or more. (3) When a load of 0.01 g / dtex is applied in the fiber axis direction, the number of the fine loop fuzz that is the furthest from the composite elastic yarn surface and whose height is within 1.2 mm is less than or equal to 1.2 mm. 3. The composite elastic yarn according to the above item 1 or 2, wherein the number is at least 1,200 / m.

(4) In guiding the elastic yarn (A) extended between the pair of yarn supplying rollers and the pair of extending rollers, the inner filament (B) and the outer filament (C) constituting the sheath to the air jet nozzle. By supplying the elastic yarn and the inner layer filament (B) along the stretching roller and separately supplying the outer layer filament (C), (A)
A method for producing a composite elastic yarn, comprising feeding both (B) and (C) to an air nozzle to form a loop entanglement, and then winding.

Hereinafter, the present invention will be described in detail. The elastic yarn used in the present invention is a polyurethane-based, polyester-based, polyetherester-based, rubber-based, or other elastic yarn. For example, the melting point of the polymer is 160 to 240 ° C.
A general polyurethane-based elastic yarn which is dry-spun or melt-spun can be used, and is not particularly limited to a polymer or a spinning method.

The fineness of the elastic yarn used is 10 to 140 d
tex is preferable, and elongation at break is preferably 200% to 900%. Above all, polyurethane-based fibers which are excellent in elasticity and do not impair elasticity at a normal processing temperature of about 180 ° C. in the pre-setting step at the time of dyeing are obtained, and the elasticity (elongation, elastic recovery) of the composite elastic yarn obtained. It is particularly preferable in view of the above.

As the inelastic filament used in the present invention, known long fibers can be used. For example, at least one of long fibers such as polyamide, polyester, cationic dyeable polyester, polypropylene, polyacrylonitrile, acetate, rayon, cupra and the like can be used. More than one species can be used. The inelastic filament used in the present invention preferably has a filament fineness (single yarn fineness) of 0.1 to 6 dtex. It is preferable to use a long fiber having a relatively large fineness for the inner filament (B) of the sheath portion and to use a long fiber having a relatively small fineness for the outer filament (C).
By providing such a fineness difference, a large number of fine loop fluffs can be formed on the surface of the composite elastic yarn, and it is possible to suppress glare and metallic luster seen in ordinary long fibers.

The fineness of the inner filament (B) is 2 to 6 d
tex is preferable, and the fineness of the outer layer filament (C) is preferably 0.1 to 3 dtex. The fineness of the fibers (so-called yarns, which are aggregates of filaments) used as these inelastic filaments is preferably from 10 to 330 dtex. The cross-sectional shape of the inelastic filament may be a round, triangular, polygonal, hollow, spontaneously crimped composite cross section, or a split type composite fiber. The spontaneously crimped composite cross-section fiber refers to a fiber that contains two components having different shrinkage properties and generates a coil-shaped three-dimensional crimp when joined and heated or swelled. It is based on a core-sheath core type.

Further, semi-dull yarns and full-dull yarns containing a matting agent such as titanium oxide, thick and thin yarns having a difference in shrinkage ratio and unevenness in the yarn length direction, and crimped yarns thereof (false twisted yarns) When a processed yarn, a knit / denit, a friction processed yarn, etc.) or an interlace mixed fiber is appropriately compounded, a composite elastic yarn having further characteristics is obtained. In the composite elastic yarn of the present invention, the mixing ratio of the elastic yarn (A) is 3 to 50 wt%, preferably 5 to 40 wt%. If it is less than 3 wt%, the elongation recovery of the composite elastic yarn is not sufficient, and if it exceeds 50 wt%, the coverage tends to be insufficient.

The mixing ratio (wt ratio) of the inner filament (B) and the outer filament (C) is B / C = 1/4 to 4/1.
Is preferred. If the content of (B) is too small, the entanglement frequency between the inner filament (B) and the outer filament (C) decreases, and the outer filament (C) becomes a loop fuzz only,
The size of the loop fluff and the number of loops may become non-uniform, and if the amount of (B) is too large, the coating of the outer filament (C) may be insufficient.

Hereinafter, the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic view showing an example of a process for producing the composite elastic yarn of the present invention. First, the elastic yarn (A) is stretched 2 to 5 times, preferably 2.5 to 4.2 times, between the first roller 1 and the second roller 2. On the second roller,
Inelastic multifilament forming inner layer of sheath (B)
Is supplied along the elastic yarn to achieve integration.

On the other hand, an inelastic multifilament (C) forming the outer layer of the sheath is supplied from the third roller 3 at a higher speed than the second roller, and an air jet nozzle provided between the second roller and the fourth roller 5 is provided. 4 to give confounding. The air pressure at this time is preferably 2 × 10 ⁵ to 1 × 10 ⁶ Pa. The feed rate between the second and fourth rollers is 0 to 10%
The feed rate between the third roller and the fourth roller is preferably 5 to 50%.

In the present invention, the inner filament (B) is supplied by increasing the yarn length difference of the outer filament (C) of the sheath portion from that of the inner filament (B) of the sheath portion and entangled by air jet. And the outer layer filaments (C) are well entangled with each other and form a substantially uniform sheath, so that fine loop fluff can be generated on the surface layer of the composite elastic yarn. Substantially refers to a state in which the filaments constituting the sheath are apparently uniformly mixed when the composite elastic yarn is visually observed. However, the outer loop filament (C) mainly constitutes the fine loop fluff.

The yarn length difference between the inner filament (B) and the outer filament (C) of the sheath portion is 1.05 ≦ C / B ≦ 1.
50, preferably 1.05 ≦ C / B ≦ 1.30. When the yarn length difference is within this range, the inner layer filament (B) and the outer layer filament (C) are well entangled with each other,
By forming a substantially uniform sheath, fine loop fluff can be formed on the surface of the processed yarn. If the yarn length difference is less than 1.05, the entanglement is insufficient, and the yarn is simply brought into a combined yarn state, resulting in a composite elastic yarn having a strong glossiness and poor coverage, which is not preferable. On the other hand, if the yarn length difference exceeds 1.50, a large loop of the outer layer filament (C) is likely to be formed, and as a result, the unwinding property from cheese is poor, and the fabric has a rough texture and appearance. It is not preferable.

The type of the air jet nozzle used in the air jet entanglement is preferably a normal hema jet nozzle (for example, type 311K, manufactured by Hemaline Co.), and a sufficient bulkiness can be obtained with another fluid entangled nozzle, the inter nozzle. There is no tendency. In addition, since the formation state of the fine loop changes depending on the type of the inelastic multifilament or the type of the yarn oil agent, it is possible to impart more stable confounding by adding water before the air injection nozzle. .

Next, the composite elastic yarn is wound as a cheese 7 by a winder 6. The stretching ratio (the speed difference between the first roller and the second roller) of the elastic yarn may be appropriately determined according to the stretching performance required for the composite elastic yarn. In the case of a high draw ratio, a high elongation rate and a high elongation recovery rate can be obtained, but the drawn yarn may be broken.
By setting the draw ratio to 2 to 5 times, preferably 2.5 to 4.2 times, the preferred composite elastic yarn in the present invention, that is, the composite having an elongation of 100% or more after treatment at 90 ° C. for 20 minutes under wet heat. An elastic yarn is obtained. The higher the stretch ratio, the more excellent the stretch properties (elongation ratio, elastic recovery ratio) of the woven fabric after dyeing and the like are.

In the present invention, since the elastic yarn (A) and the inner layer filament (B) of the sheath are supplied integrally,
Since the stress at the time of air entanglement can be dispersed to the inner filament (B) of the sheath without concentrating on the elastic yarn (A),
Thread breakage and uneven spots are remarkably suppressed, and the cored state of the elastic yarn (A) is improved, so that an excellent composite elastic yarn free from yarn displacement and stuffiness can be obtained.

The composite elastic yarn of the present invention has a thickness of 0.1 mm in the fiber axis direction.
When a load of 01 g / dtex is applied, the height of the loop fluff projecting farthest from the surface of the composite elastic yarn is 1.2.
The number of fine loop fuzz which is within the range of 12 mm is 12
It is preferably at least 00 / m. As a result, a composite elastic yarn having a high covering property and a bulky rich span tone and appearance can be obtained.

The fine loop fluff means a fluff whose measured value is within 1.2 mm, and it can be said that the larger the number of the fine loop fluff, the better the bulk elasticity of the composite elastic yarn. However, if there are many large loop fluffs, not only the unwinding property from cheese and cones is inferior, but also the process passability may be impaired. Phenomenon) tends to occur and the commercial value tends to be impaired.

When the composite elastic yarn of the present invention is used for a woven or knitted fabric, the effect can be sufficiently exerted by a usual use method. However, in the case of a woven fabric, the twisting is further performed at 50 times / m or more. This is preferable because it has an effect of fuzzing down and has an effect of improving processability. Hereinafter, examples of the fabric will be described. The composite elastic yarn of the present invention can be used for both or one of warp and weft, and other yarns such as general synthetic fibers, artificial fibers, regenerated fibers, natural fibers, and processed yarns thereof May be interwoven with one or more of the above.

The woven fabrics include flat, twill, satin, and changed textures, but satin and twill are preferred. The density of greige is determined by the cover factor: 800-1700, latitude 5
The range of 50 to 1,000 is preferred. Finish density, cover factor is 900-2,300 longitude, 630-weft
A range of 1,400 is preferred. The cover factor is (fineness of the fiber used) ^1/2 x (number / 2.54 cm)
Is a numerical value represented by

In the dyeing and finishing step, since the composite elastic yarn is used, when the fabric is relaxed after weaving, the fabric is spread in the shape of a cloth and the temperature is gradually increased from a low temperature (for example, 40 ° C.) (for example, 70 ° C.).
C., 95.degree. C., etc.) and gently shrinking the elastic yarn to suppress wrinkles. After that, it is refined and subjected to a full-fledged relaxation to obtain a texture, so that a predetermined elasticity, bulkiness, spanning texture, and appearance are exhibited. Next, after performing heat set to adjust the width and weft density of the fabric,
It is preferable to carry out an alkali weight reduction process (which may also serve as a division process) of about 30% to give a softer texture.

As a final step, dyeing is performed. Further, in some cases, for example, brushing such as so-called peach skin may be imparted by emery paper, a brush, a needle cloth, and various other finishing processes such as embossing and printing, a softener, and a water repellent. It is also possible to use a finishing agent such as an antistatic agent.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to examples. In addition, the measuring method, the evaluation method, etc. are as follows. (1) Elongation rate and elongation recovery rate of composite elastic yarn According to JIS-L-1090A method.

The sample is previously heated in hot water at 90 ° C. for 20 minutes in hot water. Then, initial load 0.002g / dtex
And mark (a) between sample lengths of 20 cm. Next, a load of 0.1 g / dtex is applied, and after 30 seconds, the length (b) between marks is read. Next, the weight is removed and left for 2 minutes. The initial load is applied again, and after 30 seconds, the length (c) between the marks is read.

This is repeated 20 times, and the result is represented by the average value. Elongation rate (%) = [(ba) / a] × 100 Elongation recovery rate (%) = [(bc) / (ba)] × 10
0 (2) Stretch rate and elastic recovery rate of woven fabric According to JIS-L-1098.

An initial load of 20 g is applied to a sample having a size of 5 cm × 30 cm, and a mark between 20 cm is made (L0). Next, a load of 1.5 kg is applied, and the length between the marks after one hour is read (L1). Then, after removing the load, the length between the marks one hour later is read (L2). It is represented by the average of n = 3 (ie, three).

Elongation rate (%) = [(L1−L0) / L0] × 100 Elastic recovery rate (%) = [(L1−L2) / (L1−L0)
)] × 100 (3) Yarn length difference A sample having a length of 2.54 cm is collected and separated into a core elastic yarn (A), a sheath inner filament (B), and an outer filament (C). The lengths of (B) and (C) are measured and expressed as the ratio of (C) to (B).

Thread length difference = (length of C) / (length of B) (4) Length and number of loop fluff Measure using a Toray fluff counter (L-DT104-2). Measurement conditions were as follows: yarn speed 9 m / min, tension 0.01 g
The measurement was performed continuously for 10 seconds under / dtex, the size and the number of loop fuzz were measured, and the numerical value expressed as a converted value between 1 meter was defined as the number of loop fuzz.

(5) Unwinding property of composite elastic yarn cheese The number of yarn breaks per million meters when over-end unwinding from a cheese wound with composite elastic yarn at a yarn speed of 400 m / min was evaluated. The evaluation was ranked in three ranks, and the number of times of thread breakage was determined as ５, up to 5 times as 、, 6 to 10 times as △, and 11 or more times as ×.

(6) Compression phenomenon of composite elastic yarn and combing phenomenon of woven fabric After the composite elastic yarn is knitted in a single knitting machine by a single knitting machine, and in the case of a woven fabric, the cloth after weaving is scoured, and is described below. Dyeing was performed by the method, and the degree of exposure of the polyurethane was evaluated by observing the degree of exposure of the polyurethane in a state where the polyurethane was not dyed or in a state where the polyurethane was sufficiently decolorized. As a dyeing method, a dye is selected according to the material of the sheath yarn. For example, cellulose yarn fibers such as rayon are dyed directly with a dye and dyed by a dyeing method which does not dye polyurethane. In addition, polyester or nylon fibers are dyed with a disperse dye, and are subjected to enhanced reduction washing to sufficiently decolor the dye from polyurethane. The appearance of the thus obtained sample was carefully observed, and the sample was ranked in three ranks according to the degree of exposure of the polyurethane.

The evaluation was evaluated as ○ when the polyurethane was not visible, Δ when the polyurethane was visible, and × when the polyurethane was well visible. (7) The bulkiness of the composite elastic yarn and the bulkiness of the woven fabric In the case of the composite elastic yarn, the knitted fabric of the filament and the spun yarn is used. The position where the total force of the swelling feeling and the lightweight feeling of the standard panel corresponded was determined and evaluated.

The evaluation was evaluated as 近似 for approximation of the spun yarn fabric, Δ for the middle of the spun yarn and filament fabric, and x for approximation of the filament fabric. (8) Gloss of composite elastic yarn and gloss of woven fabric Similar to the bulkiness of (7) above, a trial production scoured fabric is formed by using a single panel knitted fabric of a filament and a spun yarn or a plain woven fabric as a standard panel. , And the position corresponding to the gloss was determined and evaluated.

The evaluation was evaluated as ○ for approximating the spun yarn fabric, Δ for the middle of the spun yarn and filament fabric, and x for approximating the filament fabric. [Example 1] Polyurethane 77dtex with a cutting elongation of 740%
The elastic yarn (A) is stretched 4 times between a first roller (yarn speed of 78.7 m / min) and a second roller (yarn speed of 315 m / min), and a polyester W cross-section yarn 167 dtex /
60f (B) is supplied from the second roller along the elastic yarn (A) and integrated. On the other hand, a polyester W cross-section yarn 167 dtex / 60f constituting the outer layer of the sheath is supplied from a third roller (yarn speed 375 m / min) higher than the second roller.

An elastic yarn (A) at the core, an inner layer (B) at the sheath,
Air injection nozzle 4 having outer layer (C) provided between second and fourth rollers (type 311K manufactured by Hemaline)
Then, an air pressure of 5.9 × 10 ⁵ Pa is applied and air jet entanglement is performed to form loop fluff, and the air is jetted from the air jet nozzle 4. This was pulled out by a fourth roller (yarn speed 300 m / min) and wound up as a cheese 7 by a winder.

The obtained composite elastic yarn was twisted at 600 t / m, and as shown in Table 1, the elongation was 162% and 1.2 mm.
The following composite elastic yarn having 13,077 loops / m and 0 loops / m exceeding 1.2 mm was obtained. The composite elastic yarn had no wrinkling phenomenon, had good coatability, and had good unwinding property and process passability.

The composite elastic yarn was composed of 45 warps / 2.54c
m, after weaving a plain fabric at a density of 42 wefts / 2.54 cm,
According to the usual method, scouring, pre-setting, dyeing and finishing setting were performed. In the obtained woven fabric, the elastic yarn did not show any wrinkles, the warp: elongation ratio was 28%, the elastic recovery ratio was 85%,
Weft: 23% elongation, 87% elastic recovery, a stretch fabric with long fibers, rich in bulkiness and soft texture, and a spun fabric without long-fiber unique glaring or metallic luster I was able to.

Example 2 Using a polyurethane 11 dtex elastic yarn having a cutting elongation of 630%, stretched 3.3 times, 11 dtex / 7f of nylon 66 was used for the inner layer of the sheath, and 55 dtex / 96f of nylon 66 was used for the outer layer. As shown in Table 1, a composite elastic yarn was produced under the condition that the yarn length difference was suppressed. The resulting composite elastic yarn had an elongation of 141%, loop fuzz of 1.2 mm or less was 7,653 / m, and loop fuzz exceeding 1.2 mm was 0.4 / m.

143 warp yarns / 2.54
After weaving a 2/1 twill texture woven fabric at a density of 113 cm / 2.55 cm, weaving was performed in the same process as in Example 1. The obtained woven fabric had a warp: elongation of 35% and an elastic recovery of 8
8%, Weft: Elongation rate 28%, elastic recovery rate 86%, good, good coatability, bulky, except for a little gloss
It was a woven fabric with a unique soft texture and span appearance.

Example 3 Using a polyurethane 44 dtex elastic yarn having a cutting elongation of 600%, the yarn was drawn twice, and 55 dtex / 24f of the ester was used for the inner layer of the sheath and 16 of the ester was used for the outer layer.
Using 7 dtex / 96f, a composite elastic yarn was produced under the condition that the yarn length difference was large as shown in Table 2. The obtained composite elastic yarn has an elongation of 120% and a loop fluff of 1.2 mm or less in two.
4,946 pieces / m, loop fluff exceeding 1.2 mm
At 3 pieces / m, although a lot of loop fluff was generated and the unwinding property of the cheese was slightly anxious, the appearance was similar to that of a spun yarn in terms of bulkiness and luster, without any wrinkles.

The composite elastic yarn was formed of 50 warps / 2.54c
m, after weaving a plain fabric at a density of 44 wefts / 2.54 cm,
Dyeing was performed in the same steps as in Example 1. The obtained woven fabric has a warp: elongation ratio of 45%, an elastic recovery ratio of 85%, a weft: an elongation ratio of 17%, and an elastic recovery ratio of 83%. The fabric was rich in texture and appearance and appearance were similar to spun yarn fabrics.

[Example 4] Using a polyurethane 77 dtex elastic yarn having a cut elongation of 740%, the yarn was stretched three times, and 55 dtex / 24f of ester was used for the inner layer of the sheath portion and 333 dtex / 120f of ester W cross section yarn was used for the outer layer. As shown in Table 2, a composite elastic yarn was produced under the condition that the ratio (B) :( C) of the sheath portion was increased to 1: 6.

The resulting composite elastic yarn has an elongation of 162
%, 19,850 loops / m of 1.2 mm or less,
The number of loop fluffs exceeding 1.2 mm was 0 pieces / m, and the unwinding property of the cheese was good, there was no wrinkling phenomenon, and the appearance was similar to that of spun yarn in bulkiness and gloss. The composite elastic yarn is used for warp 3
After weaving a plain fabric at a density of 8 threads / 2.54 cm and a weft of 34 threads / 2.54 cm, 20 wt.
% And a dyeing process was performed. The obtained woven fabric has a warp: elongation rate of 48%, an elastic recovery rate of 86%, a weft: an elongation rate of 28%, and an elastic recovery rate of 87%, has a good covering property, and has a high bulkiness and a light weight due to weight reduction processing. In addition, it was a spun woven fabric in which drape property and soft texture were emphasized.

[Example 5] Using a polyurethane 155 dtex elastic yarn having a breaking elongation of 817%, the yarn was stretched three times, and the inner layer of the sheath portion was 55 dtex / 24f of ester in the same manner as in Example 4 and the outer layer was a cross section yarn of ester W. Using 333dtex / 120f of
As shown in Table 3, the mixing ratio of polyurethane elastic yarn was 10.4 wt.
% Of the composite elastic yarn was produced.

The resulting composite elastic yarn has an elongation of 160
%, Loop fuzz of 1.2 mm or less is 12,688 pieces / m,
The number of loop fluffs exceeding 1.2 mm was 0 / m, and the unwinding property of the cheese was good, there was no wrinkling phenomenon, and the appearance was similar to that of spun yarn in bulkiness and gloss. The composite elastic yarn is replaced with a warp 40
After weaving a plain woven fabric at a density of 30 pieces / 2.54 cm and 35 wefts / 2.54 cm, dyeing was performed in the same process as in Example 1. The resulting woven fabric had a warp: elongation of 48% and an elastic recovery of 9
0%, weft: elongation 33%, elastic recovery 92%, high mixing ratio of polyurethane elastic yarn, excellent elongation, elastic recovery, covering property, more bulkiness by using W-section yarn, and A woven fabric having a texture and appearance similar to a spun yarn woven fabric was obtained.

Example 6 A polyurethane 44 dtex elastic yarn having a cutting elongation of 600% was stretched 4.5 times, and 167 dtex / 48f of ester was used for the inner layer of the sheath and 55 dtex / 24f of ester was used for the outer layer. As shown in Table 3, a composite elastic yarn was produced under the conditions where the draw ratio of the polyurethane elastic yarn was increased and the yarn length difference was large.

The resulting composite elastic yarn has a high elongation ratio of 233% due to a high draw ratio, and has 8,350 loops / m or less of 1.2 mm or less and 0.1% or less of loop fuzz exceeding 1.2 mm. At 8 yarns / m, since the yarn length difference is large, loop fluff is generated, and the unwinding property of the cheese is poor. In addition, although it was bulky, it had a rough appearance.

167 dtex polyester false twisted yarn for warp
After weaving a plain woven fabric at a density of 55 yarns / 2.54 cm at a density of 55 yarns / 2.54 cm for the weft, the dyeing process is performed in the same process as in Example 1. Was.
The obtained woven fabric has a weft of 28% elongation and an elastic recovery of 88%.
, And there is an eye-popping phenomenon. In addition, the woven fabric was bulky but had a rough texture and appearance due to loop fluff.

Example 7 Using polyurethane 44 dtex elastic yarn having a cut elongation of 600%, stretched 3.5 times, 55 dtex / 24f of ester is used for the inner layer of the sheath, and ester 83 dtex / 72f of small filament fineness is used for the outer layer. Table 4
The composite elastic yarn was manufactured under the conditions shown in the following. The resulting composite elastic yarn has an elongation of 218%, 13,360 loops / m or less of 1.2 mm or less, and 0% of loops or more exceeding 1.2 mm.
At the number of pieces / m, the unwinding property and process passability of the cheese were good.
The appearance was similar to that of spun yarn with no bulkiness and bulkiness and gloss.

After weaving a plain woven fabric with a density of 70 / 2.54 cm on the weft using the same warp yarn as in Example 6, the composite elastic yarn is dyed in the same process as in Example 6. Processing was performed. The obtained woven fabric was a woven fabric having a weft: elongation rate of 33% and an elastic recovery rate of 87%, good coverage, rich bulkiness, light weight, and soft texture and span appearance. .

Example 8 A polyurethane 44 dtex elastic yarn having a cut elongation of 600% was stretched three times, and 83 dtex / 36 f of ester was used for the inner layer of the sheath and 83 dtex / 33 f of hydrophilic filament was used for the outer layer. A composite elastic yarn was produced under the conditions shown in Table 4. The obtained composite elastic yarn has an elongation of 195% and a loop fluff of 1.2 mm or less of 15,3.
46 pieces / m, loop fuzz over 1.2 mm 1.0 pieces /
m, the unwinding property and the process passing property of the cheese were good. The appearance was similar to that of spun yarn in terms of bulkiness, without any wrinkles.

Using the same yarns as in Examples 6 and 7 for the warp and weaving a plain woven fabric with a density of 62 / 2.54 cm of the composite elastic yarn obtained above for the weft, the same as in Examples 6 and 7 Processed in the process. Physical properties of the obtained woven fabric were: weft: elongation 22%, elastic recovery 70%. This woven fabric has excellent covering properties and bulkiness, and its surface is covered with hydrophilic filaments, so that it is possible to obtain a spun-tone woven fabric having a soft texture and texture, and having a unique gloss and resilience of rayon. Was.

Comparative Example 1 Using the same elastic yarn as in Example 3, 83 dtex / 36f of polyester was used for the inner layer of the sheath.
Using 83 dtex / 36f of polyester for the outer layer, a composite elastic yarn was produced under the air jet entanglement conditions shown in Table 5. The resulting composite elastic yarn had an elongation of 225%, 530 loops / m of 1.2 mm or less, and 0 loops / m of more than 1.2 mm.

In the same manner as in Examples 6, 7, and 8, a polyester false twisted yarn 165 dtex / 72f was used as a warp for 97 yarns / 2.5 yarns.
4 cm, 65 wefts of the composite elastic yarn obtained above for the weft.
After weaving a plain-textile woven fabric at a density of 54 cm, it was processed in the same steps as in Examples 6 and 7. The physical properties of the obtained woven fabric were as follows: weft: elongation 27%, elastic recovery 87%. This fabric is
Eyes were generated, the bulkiness was insufficient, the metallic luster was peculiar to long fibers, and the work was far from being a spun fabric.

Comparative Example 2 The same elastic yarn as in Example 3 was used, and polyester 55dtex / 24f was used for the inner layer of the sheath and polyester 167dtex / 96f was used for the outer layer. A composite elastic yarn was produced. At the inter-nozzle (MK-13 type) site, the outer layer of the sheath portion became slack, and the nozzle was dislodged or clogged.

Comparative Example 3 The same elastic yarn as in Example 3 was used, the polyester 55 dtex / 24f was used for the inner layer of the sheath portion, and the polyester 83 dtex / 72f was used for the outer layer. Produced a composite elastic yarn. The obtained composite elastic yarn had an elongation of 217% and a loop fluff of 0 / m.

Using the same warps as in Examples 6, 7, and 8,
72 wefts / 2.54 cm of the composite elastic yarn obtained above for the weft
After weaving a plain-textile woven fabric at a density of, the same process as in Examples 6 and 7 was performed. The physical properties of the obtained fabric are as follows: weft: elongation rate 3
The elastic recovery was 3% and the elastic recovery was 89%. The woven fabric had a muscular appearance, lacked bulkiness, had a metallic luster peculiar to long fibers, and was more like a filament woven fabric than a spun woven fabric.

[Comparative Example 4] Using polyurethane 77 dtex elastic yarn having a cutting elongation of 740%, and using polyester W cross-section yarn 167 dtex / 60f for the outer layer of the sheath, air jet entanglement is possible as shown in Table 6. A composite elastic yarn was produced under the condition that the yarn length difference was small. The obtained composite elastic yarn has an elongation ratio of 23.
The composite elastic yarn was as high as 5% and had zero loop fluff / m. The composite elastic yarn had no looseness and good cheese unwinding property and process passability, but lacked bulkiness.

The same yarns as in Examples 6, 7, and 8 were used for the warp, and the composite elastic yarn obtained above was used as the weft for 47 yarns / 2.5.
After weaving a plain-textile woven fabric at a density of 4 cm, it was processed in the same steps as in Examples 6 and 7. The physical properties of the obtained woven fabric were: weft: elongation 35%, elastic recovery 86%. The woven fabric had a muscular appearance, lacked bulkiness, had a metallic luster unique to long fibers, had a filament woven-like finish, and was far from being a spanned-like woven fabric.

Tables 1 to 6 summarize the conditions, results and the like for the above Examples and Comparative Examples.

[0067]

[Table 1]

[0068]

[Table 2]

[0069]

[Table 3]

[0070]

[Table 4]

[0071]

[Table 5]

[0072]

[Table 6]

[0073]

According to the present invention, even in a non-twisted yarn state, it is possible to prevent stuffiness, to significantly increase the covering property, to have a bulky rich texture and appearance, to be unwound, and to be able to pass through the process. Of the present invention can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a process for producing a composite elastic yarn of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st roller 2 ... 2nd roller 3 ... 3rd roller 4 ... Air injection processing nozzle 5 ... 4th roller 6 ... Winding machine 7 ... Cheese 8 ... Guide rod A ... Elastic thread B ... Sheath part inner layer inelastic multi Filament C: Sheath outer layer inelastic multifilament

Claims (4)

[Claims] 1. A composite elastic yarn in which at least one kind of elastic yarn (A) forms a core part and at least one kind of inelastic multifilament forms a sheath part. The filament (B) and the outer filament (C) are entangled with each other, and the yarn length difference is 1.0
5 ≦ C / B ≦ 1.50, (B) and (C) in the composite elastic yarn form a substantially uniform sheath portion, and the composite elastic yarn has fine loop fluff on the surface layer. And a composite elastic yarn. 2. An elongation rate of 1 after treatment at 90 ° C. for 20 minutes.
2. The composite elastic yarn according to claim 1, wherein the amount is at least 00%. 3. A fine loop fluff having a height of less than 1.2 mm when a load of 0.01 g / dtex is applied in a fiber axis direction, wherein the height of the loop fur protruding farthest from the surface of the composite elastic yarn is within 1.2 mm. 3. The composite elastic yarn according to claim 1, wherein the number is 1,200 / m or more. 4. An elastic yarn (A) extended between a pair of yarn supplying rollers and a pair of extending rollers, and an inner filament (B) and an outer filament (C) constituting a sheath portion are guided to an air jet nozzle. By supplying the elastic yarn and the inner layer filament (B) along the extension roller and separately supplying the outer layer filament (C), (A),
A method for producing a composite elastic yarn, comprising feeding both (B) and (C) to an air nozzle to form a loop entanglement, and then winding.