JP2002013037A - Covered elastic yarn and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a covered elastic yarn which has excellent hand feeling and excellent stretchability (stretching-back property) without deteriorating the characteristics of a non-elastic yarn used as a covering yarn and can easily be obtained at a low cost without passing through a complicated process. SOLUTION: This covered elastic yarn obtained by winding a non-elastic yarn around an elastic yarn (core yarn) to cover the elastic yarn is characterized in that the non-elastic yarn has a fineness of two times or more that of the elastic yarn, the winding number of 10 to 100 turns per meter of the core yarn, an elastic recovery of >=90% on an elongation of 50%, and a boiling water shrinkage percentage of <=30%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated elastic yarn and a method for producing the same, and more particularly, to a stretch back property which is a characteristic of a feeling and an elastic yarn without impairing the characteristics of an inelastic yarn to be coated. The present invention relates to an excellent elastic yarn and a method which can be easily manufactured.

[0002]

2. Description of the Related Art Conventionally, polyurethane, polyetherester, and the like are used for elastic fibers. When used for clothing and industrial materials, such elastic yarns are covered with an inelastic yarn to cover them. Using a circular knitting machine, the elastic yarn is stretched at the time of knitting and mixed with a non-elastic yarn to form a fabric.

Japanese Patent Publication No. 50-5305 discloses a coated elastic yarn in which a polyurethane elastic yarn is coated with a nylon yarn. However, this coated elastic yarn is twisted, heat set,
After untwisting, it was relaxed and twisted again, the manufacturing process was complicated, the manufacturing speed was low, and the cost was disadvantageous. In addition, the heat-set and relaxed treatment has a drawback that the obtained coated elastic yarn is inferior in stretchability and texture.

Japanese Patent Publication No. Sho 60-20489 discloses that a polybutylene terephthalate and a polyester filament having a higher elongation are entangled and then subjected to simultaneous drawing false twisting to form a wound yarn around a core yarn. Describes a two-layer structure yarn wound in an alternately twisted yarn shape. However, since this processed yarn uses polybutylene terephthalate as the core yarn, the stretchability is not sufficient, and the stretchback property is poor. In addition, since the confounding is applied, the processing step is also complicated, the processing speed is low, and the cost is high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an excellent texture and stretchability (stretch backing property) without impairing the properties of the inelastic yarn serving as the covering yarn. A) providing a coated elastic yarn having
An object of the present invention is to provide a manufacturing method that can be easily obtained at low cost without going through complicated steps.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention provides the following (1) to
(3) is a summary. (1) A coated elastic yarn in which an inelastic yarn is wound around an elastic yarn (core yarn) and coated, wherein the fineness of the non-elastic yarn is twice or more the fineness of the elastic yarn, The number of turns of the elastic yarn is 10 to 100, and the elastic recovery rate at 50% elongation is 9
A coated elastic yarn having a boiling water shrinkage of at least 0% and at most 30%. (2) The elastic yarn and the inelastic yarn are aligned and supplied to the drawing step, drawn at a draw ratio of 1.2 to 3.5 times, twisted at 10 to 100 T / m, and wound into a package in a wrapped shape. A method for producing a coated elastic yarn according to the above (1). (3) After stretching the elastic yarn by 1.2 to 3.5 times, supply the inelastic yarn just before the final roller, align the elastic yarn and the inelastic yarn,
(1) The method for producing a coated elastic yarn according to (1), wherein the yarn is twisted at 10 to 100 T / m and wound into a package in a pirn winding shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
First, the elastic yarn serving as the core yarn of the present invention is not particularly limited, and any elastic yarn such as generally used polyurethane elastic yarn and polyetherester elastic yarn may be used. Is 400% or more, preferably 500%
The above elastic yarns are preferred.

[0008] When the residual elongation is less than 400%, the elastic yarn is liable to be cut or excessive tension is applied when the elastic yarn is stretched. It is easy to cause cutting.

The inelastic yarn serving as the sheath yarn is not particularly limited, and polyester fibers and polyamide fibers can be used. Polyester fibers include those mainly containing polyethylene terephthalate, polybutylene terephthalate, and the like. Polyamide fibers include nylon 6, nylon 11, nylon 12, nylon 46, nylon 66, and nylon 610.
And the like as a main component. Also, fibers obtained by copolymerizing or blending these polymers may be used, and
As long as the effects of the present invention are not impaired, the polymer may contain a matting agent, a modifying agent, an antistatic agent, a pigment, and the like.

[0010] Among them, when used for clothing, texture,
In terms of cost, polyethylene terephthalate (PE
It is preferable to use a fiber mainly composed of T).

The fineness of the inelastic yarn is at least twice the fineness of the elastic yarn. The fineness of the inelastic yarn is 2 times the fineness of the elastic yarn.
By making it twice or more, the ratio of the inelastic yarn is increased, and the elastic yarn is completely covered with the elastic yarn.

If the fineness of the non-elastic yarn is less than twice that of the elastic yarn, when the yarn is mixed and finally formed into a fabric, the elastic yarn as the core yarn appears on the surface of the fabric, and the quality is inferior. . In addition, when the light resistance of the elastic yarn is poor, discoloration and a decrease in strength are caused. The upper limit of the fineness of the non-elastic yarn is not particularly limited, but if the size is too large, the characteristics of the elastic yarn are lost. Therefore, the fineness of the non-elastic yarn is preferably 10 times or less the elastic yarn.

Therefore, in order to improve the blending with the non-elastic yarn and the post-processing, the fineness of the elastic yarn is preferably 25 to 120 dtex. When the fineness of the elastic yarn is less than 25 dtex, the elastic yarn has a small strength, and is likely to be a cause of yarn breakage during drawing or blending. On the other hand, if it exceeds 120 dtex, the total fineness when blended with the inelastic yarn becomes large, and it becomes difficult to process woven or knitted fabric after blending.

The number of times the inelastic yarn is wound around the elastic yarn of the coated elastic yarn of the present invention is 10 to 100 times per meter. If this value is less than 10 times, the elastic yarn will appear on the surface of the fabric when the final fabric is obtained after blending, and the quality will be inferior. On the other hand, when the number of times exceeds 100, the elastic yarn breaks or the texture of the obtained fabric becomes hard, which is not preferable.

Here, the number of windings is as follows. In a normal covering yarn, a non-elastic yarn is wound around an elastic yarn at a rate of about 100 to 1000 times / m. By using a non-elastic yarn having a fineness of at least twice the fineness of the elastic yarn even if the number of turns is less than the number of times, the elastic yarn after fiber mixing is sufficiently covered and can be used for various purposes. By reducing the number, the excellent characteristics of the inelastic yarn can be utilized.

When the number of windings is set to 100 times / m or less, the elastic yarn and the non-elastic yarn are mixed when produced by the method of the present invention to be described later using a draw twisting machine which is usually used. Because of the twist, the elastic yarn shrinks when unwound from the pan, so as shown in FIG. 1, a substantially inelastic yarn is wound around the elastic yarn. It becomes. Therefore, the number of twists when untwisting the elastic yarn and the inelastic yarn is the number of windings when unwinding (the number of windings of the coated elastic yarn).

Further, the coated elastic yarn of the present invention has an elastic recovery rate at 50% elongation of 90% or more and a boiling water shrinkage rate of 30% or less. By satisfying these values, the coated elastic yarn of the present invention is excellent in stretchback properties and texture. When the elastic recovery at 50% elongation is less than 90%,
It is inferior in stretch back property (stretchability).

On the other hand, if the boiling water shrinkage exceeds 30%, the resulting fabric is too shrunk by post-processing such as dyeing, resulting in a hard textured fabric. Above all, as boiling water shrinkage rate,
It is preferable to set it to 25% or less.

In the present invention, the elastic recovery rate at 50% elongation and the boiling water shrinkage rate are measured by the following methods. [Elastic recovery rate at 50% elongation] Using Tensilon UTM-4-100 manufactured by Orientec, sample length 100 mm, tensile speed 100 m
After elongation to 50% elongation (E0) at m / min, it is returned to the original length at the same speed, and when elongated again, a point (E1) at which stress appears is calculated and calculated by the following equation. Elastic recovery rate (%) = {(E0−E1) / E0} × 100 [Boiling water shrinkage rate] Using a measuring machine of 1 m per round, wind the yarn 20 times, leave it for 30 minutes, and then 1/300 (cN / Dtex) with a load (L0), immersed in boiling water for 30 minutes, air-dried, measure the length with the same load (L1), and calculate by the following formula. {(L0-L1) / L0} x 100

Next, a method for producing the coated elastic yarn of the present invention will be described. There is a method in which an elastic yarn and an inelastic yarn are simultaneously drawn and twisted, and a method in which the inelastic yarn is supplied and twisted after stretching the elastic yarn. The latter is a method in which a drawn yarn or a false twisted yarn is used as the inelastic yarn, and these methods may be selected according to the application.

First, the former method will be described. The elongation of the inelastic yarn is preferably not more than 1/2 of the elongation of the elastic yarn. When the elongation of the inelastic yarn exceeds 1/2 of the elastic yarn,
The residual elongation of the inelastic yarn after the simultaneous stretching becomes too large, and when it is made into a final fabric, the strength becomes low and the pill resistance becomes poor. The lower limit of the elongation of the non-elastic yarn is not particularly limited. However, since the yarn is drawn together with the elastic yarn, if the elastic yarn is not drawn, the stitch (texture) of the final fabric may become loose. Since the elastic yarn appears on the surface of the fabric and the quality is degraded, it is preferable to secure the elongation of the inelastic yarn in accordance with the minimum draw ratio of the elastic yarn of 1.2.

Then, as shown in FIG. 2, it can be manufactured using a normal drawing and twisting machine. First, elastic yarn 1
The inelastic yarn 3 and the inelastic yarn 3 are both supplied to a stretching step and stretched at a stretching ratio of 1.2 to 3.5 times. At this time, the elastic yarn 1 that has passed through the supply roller 2 is drawn together with the non-elastic yarn 3 by the first roller 4 and stretched. The stretching is performed between the first roller 4 and the second roller 6, and it is preferable that the stretching is performed while performing a heat treatment with the heat treatment plate 5 provided between the rollers.

If the draw ratio exceeds 3.5, the contraction due to the elastic recovery of the elastic yarn becomes too large, and the texture of the obtained fabric becomes hard, which is not preferable. on the other hand,
If the draw ratio is less than 1.2, the elastic yarn will be insufficiently stretched as described above, and the resulting fabric will have loose stitches (woven stitches), or the elastic yarn will appear on the surface of the fabric, resulting in poor quality.

Then, it is twisted at 10 to 100 T / m and wound into a package in a wrapped shape. This is twisted by being wound using a spindle type winder 7 after stretching. If necessary, the covering elastic yarn may be entangled between the second roller 6 and the winding machine 7 in order to impart convergence.

Next, the latter method will be described. In this method, the elastic yarn is drawn and then mixed with the non-elastic yarn. As the type of the non-elastic yarn, a drawn yarn, a false twisted bulky yarn, or the like is preferably used. And as shown in FIG. 3, it can manufacture using a normal drawing twisting machine. First, after stretching the elastic yarn 1 by 1.2 to 3.5 times, the inelastic yarn 8 is supplied just before the final roller (second roller 6). The elastic yarn 1 extends between the supply roller 2 and the second roller 6.

The non-elastic yarn 8 is supplied to the stretched elastic yarn before the second roller 6, and after mixing both yarns, the yarn is twisted at 10 to 100 T / m and wound into a package in a pirn winding shape. In this method, the two yarns are twisted after being mixed and then wound up using a spindle-type winding machine 7. In addition,
If necessary, the covering elastic yarn may be entangled between the second roller 6 and the winder 7 in order to impart convergence.

Further, the production method of the present invention (both methods)
In order to make the number of twists 10 to 100 T / m, it is preferable that the stretching speed is 100 to 500 m / min and the number of revolutions of the spindle of the spindle type winder 7 is 500 to 5000 revolutions / m.

[0028]

Next, the present invention will be described in detail with reference to examples. In addition, the characteristic value in an Example was measured as follows. 1) Fineness Wound 80 times with a measuring machine with a circumference of 1.125 m, leave it for 0.5 hours, apply a load of 1/300 (0.3 mN / dtex), measure the length, measure the weight, It was converted to fineness. 2) Elongation Measured at a sample length of 100 mm and a tensile speed of 100 mm / min using Tensilon UTM-4-100 manufactured by Orientec. 3) Elastic recovery rate Measured by the method described above. The elastic recovery rates of the elastic yarn at 100% elongation and at 200% elongation were measured by replacing 50% with 100% and 200%, respectively. 4) Boiling water shrinkage rate Measured by the method described above. 5) Stretch back property The obtained coated elastic yarn was knitted in a tube and dyed with a disperse dye.
The dyeing temperature was 100 ° C., the dyeing time was 1.0 hour, and the obtained knitted fabric was judged by touch. As a judgment method, 10 panelists judged, and the number of persons judged as having good elasticity was judged as follows, and A was accepted. A: 8 to 10 persons B: 5 to 7 persons C: 4 persons or less 6) Hand feeling The knitted fabric obtained in the same manner as in 5) was judged by touch. As a judgment method, 10 panelists judged, and the following judgment was made based on the number of persons who judged that the texture was soft, and A and B were accepted. A: 8 to 10 people B: 5 to 7 people C: 4 or less 7) Spots (quality) Observe the knitted fabric obtained in the same manner as in 5), and see if the elastic yarn appears on the fabric surface or The presence or absence of shrinkage spots or spots on the fabric surface was confirmed, and the evaluation was made as follows. ：: There is no spot on the fabric surface △: や There is a little ×: There are many 〃

Examples 1 to 5 and Comparative Examples 1 to 4 As the elastic yarn, polyurethane and three kinds of polyetherester-based elastic yarn (the physical properties of each elastic yarn are described in Table 1) were used. As the inelastic yarn, a polyester fiber containing polyethylene terephthalate as a main component was used. These fibers are undrawn yarns or semi-undrawn yarns which have been melt-spun from a conventional melt-spinning apparatus and wound into a package. The fineness, number of filaments, and elongation of each fiber are as shown in Table 2. Was. Then, using the drawing twisting machine shown in FIG. 2, using the elastic yarn and the inelastic yarn shown in Table 2, the drawing ratio was variously changed as shown in Table 2, and the mixed fiber was drawn. In addition, the rotation speed of the spindle of the drawing and twisting machine is set to 4000 rotations / m,
The stretching speed was changed and the number of twists was changed. At this time, supply roller 2
The stretching ratio between the first roller 4 and the first roller 4 is 1.0.
And the second roller 6. The temperature of the heat-treated plate 5 was set to 110 ° C. Table 2 shows the results of evaluation of the obtained coated elastic yarn at 50% elongation, such as elastic recovery, boiling water shrinkage, and stretchback properties, texture, and quality of the obtained knitted fabric.

[0030]

[Table 1]

[0031]

[Table 2]

As is clear from Table 2, the coated elastic yarns obtained in Examples 1 to 5 are sufficiently covered with the non-elastic yarn of the core yarn, have excellent stretchback properties, have a soft feel, and have uneven spots. No fabric could be obtained. On the other hand, Comparative Example 1
Since the number of twists in the coated elastic yarn obtained in the above was too small, the core yarn was not sufficiently coated, and the obtained fabric had spots on the surface. The coated elastic yarn obtained in Comparative Example 2 had too many twists, and thus had many yarn breaks, many fluffs, and the resulting fabric had a hard texture. In the coated elastic yarn obtained in Comparative Example 3, the fineness of the inelastic yarn was too small.
The core yarn was not sufficiently covered with the inelastic yarn, and the resulting fabric showed spots and was inferior in quality. In Comparative Example 4, since the draw ratio was too high, the obtained coated elastic yarn was
The boiling water shrinkage was too high, and the resulting fabric had a hard feel, and spots occurred on the surface.

Examples 6 to 10 and Comparative Examples 5 to 8 As the elastic yarns, polyurethane and three types of polyetherester-based elastic yarns (the physical properties of each elastic yarn are shown in Table 1) were used. As the inelastic yarn, a polyester fiber containing polyethylene terephthalate as a main component was used. These fibers are melt-spun and drawn from a normal melt-spinning apparatus, and the drawn yarn or drawn yarn wound on a package is subjected to false twisting. The fineness and the number of filaments are shown in Table 3. It was shown. Then, using the stretch twisting machine shown in FIG. 3, the elastic yarn and the non-elastic yarn shown in Table 3 were used, and the stretching ratio of the elastic yarn was variously changed as shown in Table 3 for drawing. The rotation speed of the spindle of the drawing and twisting machine is 4
2,000 revolutions / m, the stretching speed was changed, and the number of twists was changed. At this time, the stretching ratio between the supply roller 2 and the second roller 6 was set to 1.0. Table 3 shows the results of evaluation of the obtained coated elastic yarn in terms of elastic recovery rate at 50% elongation, boiling water shrinkage rate, stretchback property, texture, and quality of the obtained knitted fabric.

[0034]

[Table 3]

As is clear from Table 3, the coated elastic yarns obtained in Examples 1 to 5 are sufficiently covered with the inelastic yarns of the core yarns, have excellent stretch-back properties, have a soft feel, and have unevenness. No fabric could be obtained. On the other hand, Comparative Example 5
In the coated elastic yarn obtained in the above, the number of twists was too small, and in the coated elastic yarn obtained in Comparative Example 6, the fineness of the inelastic yarn was too small. The resulting fabric had spots on the surface. The coated elastic yarn obtained in Comparative Example 6 had too many twists, and thus had many yarn breaks, many fluffs, and the resulting fabric had a hard texture. In Comparative Example 8, the elastic yarn was not drawn,
The elastic recovery was low, and the obtained fabric was inferior in stretchback properties. In Comparative Example 9, since the elastic yarn having a low elastic recovery was used as the core yarn, the elastic recovery of the coated elastic yarn was low, and the obtained fabric had poor stretch-back properties.

[0036]

As described above, the coated elastic yarn of the present invention is sufficiently covered with the core yarn, can fully utilize the characteristics of the inelastic yarn serving as the coated yarn, and has excellent texture and stretchability (stretch back property). Thus, a fabric having excellent quality can be obtained.
According to the production method of the present invention, such a coated elastic yarn can be easily obtained at low cost without going through complicated steps.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of a coated elastic yarn of the present invention.

FIG. 2 is a schematic process chart showing an example of a production process of the coated elastic yarn of the present invention.

FIG. 3 is a schematic process diagram showing another example of the production process of the coated elastic yarn of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic thread 2 Supply roller 3 Inelastic thread 4 First roller 5 Heat treatment plate 6 Second roller 7 Spindle type winder

Claims (3)

[Claims] 1. A coated elastic yarn in which an inelastic yarn is wound around and covered around an elastic yarn (core yarn), wherein the fineness of the inelastic yarn is at least twice the fineness of the elastic yarn, and Wherein the number of turns of the inelastic yarn is 10 to 100, the elastic recovery at 50% elongation is 90% or more, and the boiling water shrinkage is 30% or less. 2. An elastic yarn and an inelastic yarn are both supplied to a drawing step, drawn at a draw ratio of 1.2 to 3.5 times, twisted at 10 to 100 T / m, and wound into a package in a pirn winding shape. The method for producing a coated elastic yarn according to claim 1, wherein: 3. After stretching the elastic yarn by 1.2 to 3.5 times, supplying an inelastic yarn just before the final roller, twisting the elastic yarn and the inelastic yarn together for 10 to 100 T / m, and forming a pirn winding shape. 2. The method for producing a coated elastic yarn according to claim 1, wherein the yarn is wound around a package.