JPH0649737A - Production of elastic fabric - Google Patents

Abstract

PURPOSE:To obtain high-quality elastic fabric by weaving or knitting elastic yarn in the same way as that of nonelastic yarn without using a device for controlling tension. CONSTITUTION:Elastic yarn having >=10% elongation under 0.1g/de load at 20 deg.C, such as yarn composed of a polyester ester block copolymer is used, cooled to a temperature to give <=5% elongation under 0.1g/de load and woven or knitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an elastic cloth, and more particularly to a method for efficiently manufacturing a high-quality elastic cloth using elastic yarn.

[0002]

2. Description of the Related Art When manufacturing an elastic cloth by weaving and knitting elastic yarns typified by spandex, the elastic yarns have rubber elasticity and expand and contract at a low tension. Frequently deteriorates the quality due to spots.
For this reason, compared with the usual woven knitting of inelastic yarn, the quality is maintained by operating a limited machine at a relatively low speed and using a tension control device.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for efficiently producing a high-quality elastic fabric by using an elastic yarn by the same weaving and knitting method as that for an ordinary non-elastic yarn. .

[0004]

SUMMARY OF THE INVENTION The present invention is directed to 20.degree.
The elastic yarn having an elongation of 10% or more under a load of 1 g / de is
The present invention provides a method for manufacturing an elastic cloth, which comprises weaving or knitting at a temperature of not more than%.

In the present invention, the elastic yarn means 10% or more when a load of 0.1 g / de is applied at 20 ° C.,
It is preferably a yarn which is stretched by 12 to 100% and recovers 90% or more of its stretch when its load is removed. As the elastic yarn, it is preferable that the yarn itself has rubber elasticity regardless of the crimp. The elastic yarn may be a bare yarn or a yarn that is compounded so as to have elastic performance by a technique such as being covered with another non-elastic yarn or an elastic yarn. However, in this case, denier (d
e) refers to the denier of the elastic yarn itself, and the covering yarn is not included in the denier.

Examples of the polymer constituting the elastic yarn in the present invention include polyurethane and polyester block copolymers. As the polyester block copolymer, a block copolymer having a high melting point polyester as a hard segment and a crystalline or amorphous polyester having a melting point of 50 ° C. or less and a glass transition temperature of 0 ° C. or less as a soft segment, a high melting point polyester Examples of the hard segment include a block copolymer having an aliphatic polyether as a soft segment. Among them, the present invention is to weave and knit an elastic yarn in a state where its elongation is suppressed. Therefore, it is desirable that the soft segment has a relatively high glass transition temperature so that it can be woven and knitted.

As such soft segment, when polyester is used as the soft segment, polyester containing 50 mol% or more, particularly 60 to 100 mol% of aromatic carboxylic acid component in dicarboxylic acid component or oxycarboxylic acid component is used. Can be mentioned. In particular,
A polyester obtained by copolymerizing isophthalic acid and a long-chain diol such as hexamethylene glycol, 3-methylpentanediol, or triethylene glycol as a main component, and optionally a small amount (30 mol% or less) of another dicarboxylic acid or diol is copolymerized. It is illustrated. Such polyesters have a glass transition temperature of -10 to -30 ° C.

As a block copolymer having these polyesters as soft segments, a polyester / ester block copolymer having a hard segment consisting essentially of polybutylene terephthalate is one of the preferred polymers of the present invention. The term "substantially" means polybutylene isophthalate, polybutylene sebacate, polybutylene adipate, polyparaoxyethoxybenzoate, polybutylene dodecaneate, polybutylene orthophthalate, polyethylene terephthalate, polyhexamethylene terephthalate, and other polyesters. This means that it may be contained in a range that does not impair the characteristics of butylene terephthalate (for example, 15 mol% or less of the repeating unit). In the polyester / ester block copolymer, the weight ratio of soft segment: hard segment is preferably 90:10 to 50:50, more preferably 85:15 to 60:40.

The polyester / ester block copolymer can be produced, for example, by the following method. That is, a diester of an aromatic dicarboxylic acid, a diester of an aliphatic dicarboxylic acid and an excess amount of an alkylene glycol are subjected to transesterification reaction in the presence of a catalyst, and the obtained reaction product is polycondensed under reduced pressure, and then polycondensed in advance. Polybutylene terephthalate was added, a method of random copolymerization by transesterification reaction, aromatic dicarboxylic acid, aliphatic dicarboxylic acid and polycondensation of the reaction product obtained by esterification reaction of alkylene glycol, polybutylene terephthalate A method of transesterification,
There is a method in which the dicarboxylic acid or glycol is added to the polybutylene terephthalate obtained in advance and the transesterification reaction is performed.

The elastic yarn is obtained by molding the above-mentioned polymer into a chip shape and melt-spinning it by using an ordinary melt-spinning apparatus.
It can be manufactured by cooling.

In the present invention, the elastic yarn as described above is woven or knitted by being cooled to a temperature at which the elongation thereof is 5% or less under a load of 0.1 g / de. The cooling temperature is
A temperature at which elongation is 5% or less under a load of 0.2 g / de is preferable. In this way, by suppressing the elongation of the elastic yarn, in other words, by weaving or knitting in a state where the elastic yarn hardly stretches, it is possible to weave and knit in the same manner as the non-elastic yarn without using a special tension adjusting device. It will be possible.

The temperature at which the elongation of the elastic yarn becomes 5% or less under the load of 0.1 g / de is 0.1 by changing the temperature in advance.
It can be determined by a method such as measuring the elongation under a load of g / de or performing a tensile test at a low temperature.

When actually weaving or knitting,
Since the temperature of the elastic yarn changes in contact with the loom, the knitting machine, and the guides, it is necessary to keep the temperature below the temperature at least until the elastic yarn forms a weave or stitch.

In the present invention, the elastic yarn is 5 at 20 ° C.
Different contraction rates when left in a substantially tensionless state for 2 minutes 2
By using more than one kind of elastic yarn, it is possible to obtain a woven or knitted fabric having partially different shrinkages such as soccer.

The difference in the shrinkage ratio when left in a substantially tension-free state at 20 ° C. for 5 minutes is 5% or more, preferably 10%.
-50%, and the difference can be appropriately determined depending on the intended woven or knitted fabric.

As the yarns having different shrinkage rates as described above,
There may be mentioned two or more types of yarns made of polymers of the same composition drawn at different magnifications. Such an elastic yarn is cooled in a stretched state, and at a temperature at which its elongation is 5% or less under a load of 0.1 g / de, it is woven and knitted with almost no elongation, Like non-elastic yarns, it does not require a tension control device.

During the weaving and knitting of the elastic fabric of the present invention,
Elastic yarn has an elongation of 5 g under a load of 0.1 g / de
%, The elastic recovery performance is also deteriorated. However, when the obtained cloth is kept at room temperature, it is natural that it must function as an elastic cloth.
It is necessary to return to almost the original length when it is kept at ℃. At this time, a woven or knitted fabric using two or more kinds of elastic yarns having different shrinkages has partially different widths, densities, etc. due to the difference in shrinkage.

In the present invention, the elastic yarn is not limited to the so-called Zocki obtained by using the elastic yarn alone, but may be appropriately knitted or woven with other non-elastic yarns. At this time, it is preferable to cool the non-elastic yarn used at the same time to the same temperature. In addition, it is preferable to cool the portion where the thread passes as much as possible. For example, when weaving in a water jet loom, it is also one preferable embodiment to use water containing a refrigerant as water.

The loom and knitting machine used in the method for manufacturing the elastic fabric of the present invention are not particularly limited, and ordinary ones can be used, but only when the temperature of the loom knitting machine rises, a contracting force is generated. In many cases, it is preferable to be able to deal with this.

[0020]

In the present invention, when the elastic yarn is cooled and woven or knitted at a temperature at which the elongation thereof is 5% or less under the load of 0.1 g / de, the elastic yarn is hardly stretched. A high-quality elastic cloth can be produced with high efficiency by weaving or knitting and by using the same method as a normal non-elastic yarn without using a tension control device.

Further, as the elastic yarn, by using two or more kinds of elastic yarns having different shrinkage ratios when they are placed in a substantially tensionless state at 20 ° C. for 5 minutes, the elastic fabric can be easily obtained without controlling tension. An elastic fabric that can be woven and knitted and that has a partially different width or a partially different contraction state can be obtained when the obtained elastic fabric is returned from a cooled state to room temperature.

[0022]

The present invention will be described in more detail with reference to the following examples. In the examples, parts are parts by weight. Example 1 70 parts dimethyl isophthalate, 1 dimethyl terephthalate
2 parts, 20 parts of dimethyl sebacate and 150 parts of hexamethylene glycol were added to dibutyltin diacetate 0.17
It was heated together with the parts to remove by-product methanol. Furthermore, polybutylene terephthalate (35 ° C., intrinsic viscosity calculated from solution viscosity measured in orthochlorophenol) obtained by conducting a polycondensation reaction after further increasing the degree of polymerization by reacting at 260 ° C. under reduced pressure [η] 1.03) 65 parts were added. This was reacted at 250 ° C. under reduced pressure, and after 15 minutes, 0.06 part of phenylphosphonic acid was added, and then the mixture was discharged and cooled, and cut into chips. The obtained polymer had an [η] of 1.10 and a melting point (measurement method: measured by a differential scanning calorimeter) of 206 ° C. The polyester constituting the soft segment had a glass transition temperature of -22 ° C. After the chips were dried, they were spun using a melt spinning device to obtain a 40 denier monofilament.

Using the obtained monofilament as a core yarn,
An ordinary polyester filament 150 denier / 72 filament false twisted textured yarn was used as the sheath yarn, and a single covering was performed to obtain a covering yarn. 20 ° C for this covering thread
The elongation when a load of 4 g (corresponding to 0.1 g / de) was applied was 15%, but it was 4% at -10 ° C. This covering yarn was circularly knitted with a circular knitting machine installed in a room at -10 ° C without a tension control device etc., but the fluctuation width of the width measured after returning to room temperature was 1.5%.
The fluctuation range was almost the same as when the ordinary polyester yarn was knitted. Further, the visual inspection did not reveal any defects such as streaks in the knitted fabric.

Comparative Example 1 The same covering yarn as used in Example 1 was circularly knitted in a room at 18 ° C. in the same manner as in Example 1, but it was observed that the yarn was not uniformly supplied, and the width was The fluctuation range is also 4.3
%Met. The resulting knitted fabric had scattered streaks and twitches.

Example 2 The same covering yarn as used in Example 1 was stretched 20%,
It was wound on a bobbin and kept at -20 ° C. Using this yarn and the unstretched covering yarn, -20 in the same manner as in Example 1.
When the fabric was alternately knitted by 10 cm in a room at 0 ° C., the variation in width was about 2% in this chamber, but when returned to room temperature, the variation in width was 9%. It was also found that when a part of the yarn used after being stretched by 20% was unwound and kept at 20 ° C. for 5 minutes without tension, the length was the same as before stretching.

Example 3 The same covering yarn as that used in Example 1 was wound around a bobbin so that it could be fed from a state of being placed inside a refrigeration unit cooled to -20 ° C., and this covering yarn was used as a weft yarn. As a warp, a polyethylene terephthalate yarn of 75 denier / 36 filament is used, and carbon dioxide gas is blown from a carbon dioxide gas cylinder to a portion in contact with the yarn, such as a nozzle of an ordinary air jet loom, and the surface temperature is -10 ° C.
After cooling as described below, weaving was immediately performed using the cooled covering yarn. The temperature of the weft yarn immediately after obtained was -10 ° C or lower. Further, the width change of the obtained woven fabric was as small as 2.0%, and defects such as streaks were not observed.

[0027]

According to the present invention, tension control, which has been a problem in the weaving and knitting of elastic yarns, is facilitated, and the weaving or knitting can be performed easily as in the case of non-elastic yarns without using a tension control device. Therefore, it is possible to obtain an elastic fabric in which the quality of the obtained woven or knitted fabric is eliminated, such as uneven width.

Further, when two or more kinds of elastic yarns having different shrinkage ratios when placed in a substantially tensionless state at 20 ° C. for 5 minutes are used, the elastic fabric can be easily woven and knitted without controlling tension. It is possible to obtain an elastic fabric having a partially different width or a partially contracted state when the obtained elastic fabric is returned from a cooled state to room temperature.

Claims (2)

[Claims] 1. An elastic yarn having an elongation of 10% or more under a load of 0.1 g / de at 20 ° C. has an elongation of 0.1.
A method for producing an elastic fabric, which comprises weaving or knitting at a temperature of 5% or less under a load of g / de. 2. The method for producing an elastic fabric according to claim 1, wherein as the elastic yarn, two or more kinds of elastic yarns having different contraction rates when placed in a substantially tensionless state at 20 ° C. for 5 minutes are used.