JPS5982434A - Production of special blended fiber false twisted 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 The present invention relates to drawing and false twisting a spun mixed fiber undrawn yarn, and more specifically, to a polyester polymer component made of polybutylene terephthalate (PBT) that can yield a highly elastic yarn. and polyethylene terephthalate (PET) or its modified polyester polymer component are mixed and spun from the same nozzle, and the resulting undrawn yarn is continuously or simultaneously drawn and false twisted. It is related to.

Recently, PBT and its modified polymer fibers have been developed as polyester fibers with high elasticity, but because these fibers are highly crystalline, staining occurs in the length direction of the fibers and between the spindles. The present invention was developed as a result of extensive research aimed at eliminating these drawbacks and creating a new material with distinctive texture.

In other words, by sequentially or simultaneously stretching and false twisting undrawn yarns that are spun out from the same spinning nozzle and wound up with a polyester polymer component made of PBT and PET or its modified polyester polymer component, a yarn length difference naturally occurs. However, a special bulky yarn that provides bulkiness and does not impair the high elastic properties inherent to PBT fibers has been obtained.

As mentioned above, even if undrawn yarn spun from PBT and undrawn yarn spun from PET are wound at the same winding speed, the former (
PBT) has higher crystallinity and direct orientation, so it has lower residual elongation, and by false twisting these at the same time, FB'r fibers with low residual elongation are used as core yarns, and PET fibers are used as side yarns. Due to the stretching process, a difference in yarn length naturally occurs, resulting in a bulky textured yarn. At this time, if PET is modified with isophthalic acid or sulfoisophthalic acid, the melting point will be lowered, and the residual elongation of the resulting undrawn yarn will tend to increase. Since the difference in yarn length is large, the difference in yarn length is large, which is more preferable for bulkiness. The blending ratio of fibers with different polymer components is 10 to 90%, which provides characteristics of high elongation elasticity and bulk, but it is more desirable to have 25 to 75%.

The 10% elongation recovery rate of the blended spun false-twisted yarn blended in this way is as follows:
It shows good elasticity with a recovery rate of 70% or more without significant loss compared to the above.

In addition, these mixed fiber spun and undrawn yarns have a PBT viscosity of P
As long as the viscosity is not much lower than that of ET, the 1krBT fiber tends to become a core yarn during false twisting, and the stretch recovery and high elasticity are not impaired. However, since the softening point and melting point of FB'l' are approximately 40°C lower than those of PET, PBT tends to decompose and the viscosity easily decreases at a spinning temperature higher than the melting point of PBT for simultaneously performing mixed fiber spinning. Therefore, it is desirable that the viscosity of PUT be higher.

By using the thus obtained mixed fiber spun and false-twisted yarn, it is possible to obtain a fabric that is elegant and has excellent bulkiness and elasticity, and examples thereof are shown below.

Examples 1 to 4 and Comparative Examples 1 to 2 As shown in Table 1, Examples 1 and 2
ETΦ) and 9:27 (A component 25%) and 2
This is an undrawn yarn spun for 75 denier 66 filament at a blending ratio of 7:9 (component A: 75%). Example 5 is PBT (A) and SIP 5 mol% modified PE
T (B) at a blending ratio of 18:18 (A component 50%),
In addition, in Example 4, IPA 8 mol% modified PET was mixed with CB, 1
1s: 18 (A component 50%
) is an undrawn yarn that has been mixed and spun at a blending ratio of

On the other hand, Comparative Examples 1 and 2 are undrawn yarns for 75 denier 66 filaments that were spun using only PBT and only PET, respectively. Note that the units of spinning speed are m7 minutes, spinning temperature °C, fineness d, and elongation %.

Table 1 Polymer [η] Spinning speed Spinning temperature Fineness Elongation comparative example I PBT LO62,500270
1052402PET 0.68 2.500
285 445 502 These undrawn yarns are shown in Table 2.
False-twisting was performed under the stretch false-twisting conditions shown below. Example 1
Only continuous method (outdraw false twist hot pin temperature 90℃
), and the others are simultaneous method (indraw-false twist).

The number of false twists was 5,550 t/7'rL, the false twisting speed was 9677 L/min, and the false twisting temperature was 185 t/7'rL.
Table 2 shows the stretching conditions and the properties of the processed yarn obtained.

Table 2 Stretching ratio Entanglement treatment Fineness Bulkyness Stretching recovery rate Needleworker Example 1 1.93XLO4-78,808+
Q2 +, 95 = aoy
+ ○ 85 03 1.4! I
-79,5◎ 85 04 L43,
20'lj 79.0 0 81 0 Comparative Example 1 1.41' -76,8X
86 X2 1.90 - 78
．． 5 X 55 Examples 3 and 4 have particularly excellent bulkiness, and each of Examples 1 to 4 also exhibits dichroism due to the easy dyeing property of PBT, but Example 4 with interlace (entanglement 914!,) has this property. Dichroic properties were observed, and in Example 6, it was possible to dye differently with cationic dyes.

In contrast to these inventions, Comparative Example 1, which is a yarn processed only with PBT, has an excellent elongation recovery rate, but does not have the bulkiness observed in the examples (Comparative Example 2, which is a yarn processed only with PET, has an excellent elongation recovery rate). was also low.

Patent applicant RiRa Shiyo Co., Ltd. Patent attorney Ken Honda

Claims (1)

[Scope of Claims] 1) When performing mixed fiber spinning by spinning polyester polymer (1) consisting of polybutylene terephthalate and polyethylene terephthalate or its modified polyester polymer (13) from the same spinning nozzle, component (5) A method for producing a special mixed fiber false-twisted yarn, which comprises continuously or simultaneously stretching and false-twisting wound undrawn yarn such that the composition ratio of the yarn is from 10 to 90% by weight. H) A method for producing a special mixed fiber false twisted yarn as described in the preceding item, characterized in that the polymer viscosity of the two components (A) and (B) is higher in (4).