JPS60146030A - Polyester composite interlaced crimped yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a composite intertwined crimped yarn comprising polyethylene terephthalate filaments and polybutylene terephthalate filaments.

BACKGROUND ART Conventionally, the use of composite yarns of polyethylene terephthalate and polybutylene terephthalate as stretchable yarns for woven and knitted fabrics has been known.

For example, JP-A-57-205536 discloses an alternately twisted two-layer structure yarn using polybutylene terephthalate as the core yarn and polyethylene terephthalate as the crimped yarn. This is because the winding state around the core thread is relatively gentle, so the elasticity of the polybutylene terephthalate core thread is not inhibited.

however.

Since the yarns of this type consist of only alternating twists, the yarn structure is unstable as the core yarn and wound yarn may separate due to repeated expansion and contraction. For this reason, even if the yarn structure is stabilized by interlacing before and after the false twisting process, K, which exhibits excellent stretch characteristics, should eliminate instability in the yarn structure as long as a two-layer structure yarn is created with light entanglement. It's difficult.

This kind of knitted yarn has a heathered texture, but in woven and knitted fabrics, the heathered texture and luster are most sensitive to the visual sense, and therefore the yarn manufacturing process and the yarn structure after it is made into a product are important. Subtle changes tend to appear as spots or defects, so stabilizing the thread structure is extremely important.

C1 Object of the present invention The object of the present invention is to provide a composite yarn consisting of polyethylene terephthalate and polybutylene lenticulate yarn, which is rich in cast lenticules, and which is stable in yarn structure through repeated expansion and contraction. The object is to create a yarn for woven or knitted fabrics that has the surface effect and flexibility of woven or knitted fabrics.

21 Structure of the present invention [([) A crimped multifilament yarn composed of filament fibers made of polyethylene terephthalate and filament fibers made of polybutylene terephthalate, the total length of the intertwined portion being 20% or more per meter. 1. A polyester composite interlaced crimped yarn characterized in that most of the single fibers present in the interlaced and bundled portion exhibit a wavy crimped or coiled crimped structure in an integrated state. In the present invention, since the multifilament yarn is made of polyethylene terephthalate and polybutylene terephthalate, polybutylene terephthalate has excellent elasticity and is highly stretchable, and has the effect of improving stretch properties. Play gold. In addition, polybutine/terephthalate yarn has an initial tensile resistance comparable to that of polyamide, and unlike composite yarns made of polyethylene terephthalate, it has a softer texture.
There are many benefits to using polybutylene lentil reflex crates.

Here, the intertwined portion has a total length of 201 per meter of yarn length.
It is necessary that the length is at least the same. The reason for this is that it is necessary to have structural stability during the crimping process, the two-knit weaving process, and the finished product. For this purpose, it is preferable that the intertwined portion be strong or have a high ratio of intertwined portions. If the intertwining is weak, the intertwined portions will be unraveled during the crimping process and will not be able to exhibit the surface effects described below, no different from normal crimped yarns. Also, if the ratio of intertwined parts is high, the structure becomes an integrated crimped structure, which is rich in surface effect and flexibility, but on the other hand, if the ratio of intertwined parts is low, an integrated structure and crimped structure cannot be obtained, and the single fiber becomes The fibers become open and only spot-like unresolved portions remain, and a wavy or coiled crimped 11η structure cannot be obtained.

To obtain the yarn of the present invention, the overfeed rate at the time of interlacing is 3.
%, preferably 5 inches or more, and the fluid pressure is 2 to 7 kg/♂
When intertwining is performed, crimp is also applied to the upper part of the intertwined portion, resulting in a yarn having the above-mentioned tight crimped structure. Further, the false twisting conditions may be the same as those for normal crimped yarn. If the number of false twists is small, the crimps will be rough, and if the number of false twists is large, the crimps will be dense, resulting in a dense surface effect as described below. In addition, in order to further impart a surface unevenness effect, the
Additional twisting may be performed in the same direction as the false twisting with a twist coefficient (K) of 00.

The false twisting temperature can preferably be about 120 to 220'O.

In this, the intertwined part ratio is the total 3 of the intertwined parts to the yarn length.
It is the ratio of 1 length and is measured as 9th order.

Count the average number N of intertwined parts of a unit length under a tension of 0.1 g/D in a non-tensioned state. continue,
0.1t! , /D under tension, insert a bottle into the unconfused area.

The bottle is moved in the longitudinal direction of the thread ρ with a tension of 0.02 g / 1)
Move it back and forth and find the average length of the unentangled part 5 (i-).

From N and S obtained in this way, the intertwined portion ratio can be calculated using the following formula.

Effects of the present invention The effects of the present invention are that the polyethylene terephthalate and polybutylene lenticulate yarns are highly stretchable, and that the yarn structure is stabilized through repeated expansion and contraction, and that the surface effect and flexibility of woven and knitted fabrics are improved. A yarn for woven or knitted fabrics is produced. Next, an example will be given and explained.

Example 1 Multifilament drawn yarns 75D-56f of polyethylene terephthalate and polybutylene terephthalate were subjected to intermittent entangling treatment at a total overfeed ratio of 5 to obtain 9 strongly entangled yarns, which were then processed at a processing temperature of 205゛. Preliminary combustion processing was performed under the following conditions: a force a 1 speed fig: 100 m/++11 n false twist number: 2450 T/M processing feed 2 -3%. The confounding ratio at this time is 22
It was Chi. This thread is made of polyethylene terephthalate 5
A fabric using 0D-36f as warp yarn was woven and dyed and finished. The resulting fabric had a uniform heathered texture, a stretch rate of 25, and a rich uneven surface variation.

Example 2 Using the same yarn as in Example 1, false twisting was carried out under the same processing conditions as in Example 1, with an entangled feet ratio of 7%. The confounding ratio at this time was 435%. This yarn was woven into a fabric using the same warp yarn as in Example 1, and dyed and finished. The result was the same K as in Example 1.

Comparative Example Using the same yarn as in Example 1, false twisting was carried out under the same conditions as in Example 1, with an entangling feed rate of 2% and a processing feed of 12 rounds. The confounding ratio at this time was Z. This yarn was woven into a fabric using the same warp yarn as in Example 1, and dyed and finished. The results showed that there were almost no surface effects.

[Brief explanation of drawings]

FIG. 1 shows the intertwined crimped yarn of the present invention. 1: Interlaced area 2: Uninterwoven area 6: Polyethylene terephthalate 4: Polybutylene terephthalate Patent applicant Higashi Shikikai Co., Ltd. Figure 1

Claims (1)

[Claims] +11 A crimped multifilament yarn composed of filament fibers made of polyethylene terephthalate and filament fibers made of polybutylene terephthalate, in which the total length of the intertwined portions is 20 or more per 1 m, and the intertwined and converged fibers are A polyester-based composite intertwined crimped yarn characterized in that most of the single fibers in the part are integrated and exhibit a wavy or coiled crimped structure.