JPH01148826A - Coated elastic yarn - Google Patents

Abstract

PURPOSE: To obtain a coated elastic yarn having improved see-through phenomena and reduction in strength of elastic yarn by arranging an elastic yarn as a core component and a polyamide-based nonrotating crimped yarn having interlaced bundled parts and crimped parts in the length direction as a sheath component. CONSTITUTION: An elastic yarn is arranged as a core component and a polyamide-based nonrotating crimped yarn obtained by forming interlaced bundled parts in the length direction of the yarn on a polyamide multifilament yarn obtained at >=4,000 m/minute spinning and crimping rate, then heat-treating the yarn in a relaxed state to fix its shape and elongating the yarn to eliminate a part of loops and the interlaced bundled parts is laid as a sheath component to give the objective coated elastic yarn having <=0.5 crimp shape factor by (crimp elongation ratio CE)/(number of crimps N), luster of raw thread and excellent coating properties even in a low false twist count.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] ``The present invention relates to a coated elastic yarn suitable for underwear, shorts, socks, etc.

[Conventional technology and its problems]

Conventional coated elastic yarns consist of sublimely processed yarns, filament yarns, spun yarns, etc. around elastic yarns such as polyurethane or rubber.
Mainly, actual twist coating is performed.

When the processing speed is increased, the number of twists becomes lower, and the degree of coverage of the elastic yarn becomes lower, resulting in the so-called 'peeling' phenomenon, which not only reduces the commercial value but also causes greater damage to the elastic yarn in the post-processing process. there were.

[Means for solving problems]

The purpose of the present invention is to use an elastic yarn such as polyurethane or rubber as a core yarn, and coat it with polyamide non-swirling crimped yarn, which has high commercial value, excellent covering properties, and can reduce costs by increasing speed. It is an object of the present invention to provide a coated elastic yarn.

That is, the object of the present invention is to provide a covered elastic yarn in which a core component is an elastic yarn and a sheath component is a polyamide non-swirling crimped yarn, and the polyamide non-swirling crimped yarn has a spinning crimp speed of 40.
The polyamide multifilament yarn obtained at a speed of 00 m/min or more is subjected to an entanglement treatment using an air jet flow to form an entangled bundle along the longitudinal direction of the yarn, and then heat treated in a relaxed state to fix the form. It is obtained by elongating the fibers and removing a part of the loops and the interlaced eastern part, and the interlaced eastern part and the crimp part exist in the yarn length direction, and the shape coefficient is 0.5 or less. This is achieved by a coated elastic yarn characterized by:

The present invention will be explained in detail below. The elastic threads used in the present invention include natural rubber, synthetic rubber, polyether polyurethane, and polyester polyurethane, and the polyamide fibers may be any polymer having an amide bond in the main chain, such as nylon 4, nylon 6, nylon 8, nylon 10, nylon 46, nylon 66, nylon 6/10, etc.

Polyamide-based non-turning crimped yarn with a crimp shape factor of 0.5 or less, unlike ordinary false twisted yarns such as woolly nylon, has the luster of the original yarn without impairing it, and is covered by loops and interlaced gathering parts. It is also a yarn with excellent properties.

Therefore, by using this polyamide-based non-turning crimped yarn as a sheath yarn to cover the periphery of the elastic yarn, it is possible to obtain a coated elastic yarn that has luster, has good coverage even with a low number of twists, and has commercial value. Can be done.

Therefore, it is possible to improve the so-called "peeling" phenomenon in which elastic yarns, which have lower dyeability than polyamide after dyeing, become whitish and noticeable, by providing good coverage.

Furthermore, it is possible to prevent the disadvantage that the strength of the elastic yarn decreases due to insufficient coverage during heat setting with a heated object in the post-processing process.

The polyamide multifilament thread used as a raw material in the present invention is melt-spun at a winding speed of 400
Partially oriented yarn drawn at high speed above 0 m/preparative. This yarn has a low heat shrinkage of 4% or less expressed by fresh water shrinkage, and preferably has an initial Young's modulus of 1.
00g/d or less. Partially oriented yarn drawn at a winding speed of 4000 m/min or higher may be used in advance, or by cold stretching or hot stretching before entering the air jet stream, and stretching the yarn to 2 times or less, preferably 1.60 times or less. It is possible.

Furthermore, it is also possible to use a yarn that has been given crimp characteristics in advance by giving minute cooling spots in the yarn length direction when spinning at 4000 m/min or more. Since this yarn already has crimp characteristics, it is presumed that the crimp shape factor will be even higher.

If the yarn is formed at a spinning winding speed of less than 4000 m/7 minutes, the elongation at break of the yarn will be as high as 50% or more. Elongation treatment is not preferable because the fibers themselves elongate, making it difficult to eliminate loops. On the other hand, 400
It is also possible to reduce the fresh water shrinkage rate and the initial Young's modulus by drawing the filament yarn obtained at a spinning take-up speed of 0 m/min or less, but in that case, uneven drawing may occur. This is undesirable because it causes problems such as hair and fluff.

The entangling treatment with air jets in the elongation step is carried out by means of known injection nozzles used in the production of loop-entangled crimped yarns.

It is desirable to change the flow condition of the air jet stream as appropriate depending on the denier, cross-sectional shape, etc. of the yarn to be processed. To do this, change the feed rate, the method of air injection from the nozzle, such as the air introduction angle, etc. Just change the number of holes.

Then, processing conditions such as air pressure, overfeed rate, nozzle shape, etc. are adjusted so that the degree of entanglement is such that loops and intertwined portions can be eliminated by elongation treatment after relaxation heat treatment, which will be described later.

The relaxation heat treatment is performed at the same time as or immediately after the entanglement treatment using the air jet flow described above, but for continuous treatment, it is preferably performed while the yarn is running using a heater. The type of heater may be either a contact type or a non-contact type.This heat treatment increases the thermal stability of the yarn, but it also increases the entanglement strength of the entangled part and causes a loop disappearance effect during the subsequent elongation process. It is necessary to choose conditions that will not cause any damage.

An apparatus suitable for carrying out the described method is shown in FIG.

The yarn introduced from the package A of the polyamide partial alignment system obtained by the above-mentioned high-speed spinning to the known air injection nozzle 3 via the delivery roller 1 is not overfed between the rollers 1 and 2 and is entangled. After being processed, loops and fuzz will occur.

The overfeed rate is preferably 6 to 40%, and the air pressure is 3 to 1% depending on the characteristics of the feed material and the speed of addition.
0 kg/ajG is used.

The overfeed rate of entanglement treatment with air injection nozzle is 6%
Below this, the filaments will not be opened enough, the entanglement will be insufficient, and the number of crimps in the resulting crimped yarn will be small, which is not preferable.

On the other hand, if the overfeed rate is 40% or more, loop fuzz will occur frequently and entanglement will become strong, and detangling will be insufficient in the elongation treatment after relaxation heat treatment, resulting in fewer crimped areas and more remaining loop fuzz, which is not preferable. .

Next, the yarn is subjected to a relaxing heat treatment by a heater 5 without overfeeding between the rollers 2 and 4, and is heat-set in that state. At this time, the yarn tension inside the heater is 0.
．． Set the feed rate to be 1 g/d or less. However, as mentioned above, since the yarn is thermally stable, this relaxation heat treatment also prevents it from shrinking excessively and increasing the interlacing strength of the interlacing convergence portion. Note that this relaxation heat treatment can also be performed simultaneously with the entanglement treatment using the air jet flow using hot air.

When the tension in the relaxation heat treatment heater increases to more than 0.1 g/d, the entangled fixation becomes strong, and the entangled portion cannot be erased by the stretching process between the rollers 4 and 6, and a large amount of loop fuzz remains. , the number of intertwined parts increases, which is not preferable.

The relaxation heat treatment is carried out at a temperature of 150° C. or higher and lower than the melting point at which the filament entanglement can be fixed in shape.

Next, the yarn is under-fed between rollers 4 and 6 and subjected to elongation processing, whereby some of the loops and interlaced convergence portions generated during the interlacing processing are elongated and eliminated, making crimp latent. do.

The injection nozzle, air pressure, injection feed rate, relaxation treatment temperature, underfeed rate, etc. are adjusted so that a part of the entangled convergence part is stretched and erased with a tension of 0.5 g/d or less for the elongation treatment.

The elongation treatment tension after the relaxation heat treatment is preferably 0.5 g/d or less, preferably 0.3 g/d or less to eliminate the entangled portions.

If the stretching treatment is performed with a tension of 0.5 g/d or more, the filament will break and cut fuzz will occur, which is not preferable.

As described above, it is necessary to set the stretching, injection, relaxation heat treatment conditions, etc. of the supply system so that the stretching tension is 0.5 g/d or less. Finally, it is taken up as package B onto the winding drive 7.

The yarn of the present invention thus obtained is a non-turnable crimped yarn that does not have large loops but instead has fine crimps, and has a spring shrinkage rate of 1 to 2% and is thermally stable. It has excellent properties and a crimp shape factor of 0.5 or less. In addition, the number of intertwined and focused parts where each component filament is intertwined and focused is lO ~ 40
This is a novel method in which the length of p11100 other than the interlaced convergence part is in the range of 5 to 70 Tsuru. It is of composition.

The outline of the form of this yarn is shown in FIG. 2, in which reference numeral 11 is a constituent filament, 12 is an entangled convergence part, and 13 is a loop.

Further, evaluation of the yarn was carried out in accordance with the following.

Spring water shrinkage rate: According to JIS L1073-6.12 "Hot water shrinkage rate" measurement method.

Initial Young's modulus: Based on JIS L1073-6.10 "Initial tensile resistance" measurement method.

Number and length of intertwined convergence parts: An initial load of 0.1 g/d is applied to the yarn to be tested, and the yarn length of 50 cia is marked at two points on the top and bottom. Next, divide the multifilament yarn into two at the upper mark point, hang a hook weighing 30 g and let it fall under its own weight, and when it stops, move the hook directly below it and divide it into two halves.
Repeat over the entire length of 9cm. The number of stopping points corresponds to the number of confounding convergence parts. Also, measure the length at that point and use it as the length of the core.

Crimp elongation rate: According to the seal S L1077-5/7 nylon filament bulky yarn test method.

Number of crimp: According to JIS L1074-6.11.1 synthetic fiber stable test method.

The manufacturing process of the covering yarn is shown in the schematic diagram of FIG. 3, in which the elastic yarn 21 is sent out from the package 22 by guide rollers 23 and 24 and is supplied to a feed roller 26 via a guide 25. Between the feed roller 26 and the delivery roller 27, the drafted elastic yarn 21 passes through a hollow spindle 28, where it is wound with a polyamide non-turning crimped yarn 30 to become a coated elastic yarn 34, and then passed through a take-up roll 33. is wound up into a package 32.

<Example> A package of 20 d/7 f of nylon 66 filament yarn was formed at a spinning winding speed of 4000 m/min, and the package was placed in the apparatus shown in FIG. 1 to carry out the processing of the present invention.

Processing speed 600m/min, air injection pressure 6kg/cnlG
The overfeed rate before injection was 13.5%, the overfeed rate in relaxation heat treatment was 5.3%, the heat setting temperature was 210°C, and the elongation underfeed rate was -11.8%.

The properties of the obtained non-swirling crimped yarn after being relaxed in boiling were as follows.

Crimp elongation rate 3.4%, number of crimps 11/inch.

Crimp shape coefficient: 0.31 Using the apparatus shown in FIG. 3, polyether polyurethane elastic yarn 280 d/32 f was used as elastic yarn 1 to form a covering yarn using the non-turnable crimped yarn under the following conditions.

(Sample A) Draft 1.25 times, hollow spindle rotation speed 800゜r
pm, number of twists 2007/M, winding feed rate +6
5% Next, an undrawn yarn of 60 d/7 f of nylon 66 filament yarn was obtained at a spinning winding speed of 1500 m/min, which was drawn and false-twisted at 800 m/min to a torque number of 800 T/M.
, 20 d/7 f woolly processed yarn was obtained.

Polyether-based polyurethane elastic yarns 280d/32f are coated in the same manner as sample A using this woolly processed yarn. This covering yarn is referred to as sample B.

Using Samples A and B, place 3 on the inside of the opening of the sock.
A slip prevention part was formed with a cm width, dyed, and set as a foot shape.

The degree of peeling during wearing and the zero strength retention rate of the spandex taken out from the anti-slip part were examined.

It can be seen that the coated elastic yarn of the present invention has a high degree of coverage.

“Strength Retention [Effect of the Invention] As detailed above, the coated elastic yarn obtained by the crimped yarn of the present invention suppresses the so-called peeling phenomenon and protects the elastic yarn despite the low number of twists. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a device suitable for producing crimped yarn used in the covered elastic yarn of the present invention, and FIG. 2 is a configuration of the crimped yarn used in the covered elastic yarn of the present invention. FIG. 3 is an enlarged view showing an example of an apparatus for manufacturing a covered elastic yarn according to the present invention. 1.2, 4.6...Roller, 3...Air injection nozzle, 5...Heater, 7...
- Winding drum, 11... filament, 12
...Confounding convergence part, 13...Loop. Salary 1 figure Salary 2 figure Salary 3 figure

Claims (1)

[Scope of Claims] A covered elastic yarn in which an elastic yarn is arranged as a core component and polyamide non-turning crimped yarns are arranged as a sheath component, wherein the polyamide non-turning crimped yarn is interlaced and bundled in the yarn length direction. A covered elastic yarn having a clip shape factor defined by crimp elongation (CE)/number of crimp (N) of 0.5 or less.