JPS6385132A - Core-sheath bulky processed yarn - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bulky textured yarn (Taslan yarn) having a core/sheath two-layer structure by fluid agitation treatment and having an unprecedented function. More specifically, the present invention relates to Taslan yarn that has sufficient durability and good dyeability even when used for automobile interior materials such as car seats.

[Prior art] So-called taslan yarn, in which two or more yarns are perforated by a fluid jet to form loops, arches, and sag to create bulky yarn, is well known among textile manufacturers. . The yarn obtained by this Kusulan yarn processing has a unique texture that is different from ordinary false twisted yarn, such as having a bulky yet spun-like texture, and is therefore used for a variety of purposes. . Particularly in recent years, there has been a rapid shift from conventional leather made of vinyl chloride to fabrication in automotive interior material applications such as car seats. In response to this trend, attempts are being made to develop Taslan processed yarn, which has a spun-like texture, into automobile interior materials such as car seats.

When Taslan yarn is used for automobile interior materials, polyester fibers with excellent light resistance are used as the material, but conventionally known polyester Taslan processed yarns were designed for clothing, so they can be used directly in automobiles. Even when applied to interior materials, the strength of the threads is insufficient and there are problems with the durability of the fabric. Taslan processed yarn generally has a yarn structure in which the decorative yarn is supplied to the core yarn under overfeed and the decorative yarn is wrapped around the core yarn, so the strength of the Taslan yarn is Basically, it is almost uniquely determined by the strength of the core yarn.

Therefore, in order to increase the strength of the Taslan yarn, it is sufficient to increase the strength of the core yarn. Specific methods for increasing strength include increasing the denier of the core yarn and increasing the strength of the polyester fiber mixture used as the core yarn, but the former method is difficult to adopt as it runs counter to the recent trend towards lighter weight fabrics. On the other hand, in the latter method, high strength is generally achieved by increasing the draw ratio during production of the core yarn, which becomes the core yarn. The difference in dyeability between the yarns becomes large, and when Taslan yarn is dyed, a new problem arises in that the core yarn appears whitish, degrading the quality of the product.

[Problems to be Solved by the Invention] The purpose of the present invention is to solve the problems of the prior art described above, and to provide a Taslan yarn that has sufficient durability and good non-stick properties even when used in automobile interior materials. It is about providing.

[Means for Solving the Problems] The object of the present invention described above is to provide a method in which a decorative thread made of polyester fiber is looped around a core thread made of polyester fiber,
It is a highly processed yarn that is wound to form an arch or sag, and the tenacity (T) of the core yarn is 2.7 to 71 or more, and the intrinsic viscosity of the core yarn is 0°65 to 0.90. In addition, the dyeability difference ΔL between the core yarn and the decorative yarn defined as below can be achieved by using a core and bulky textured yarn that satisfies the following formula.

0.04≦ΔL≦0.22 (ΔL=(L−LSD/LK J) The present invention will be described in more detail below.

The taslan yarn consisting of the core yarn and decorative yarn of the present invention must be composed of polyester fiber. When materials other than polyester fibers are used, there are problems with light resistance, and especially when used for car seats, etc., the durability is insufficient. The polyester fiber referred to herein is a polyester having ethylene terephthalate as a main repeating unit, but may be a polyester copolymerized with addition of 10 mol % or less of a third component as necessary.

Furthermore, it is preferable that the polyester fiber used for the decorative yarn is a yarn with an irregular cross section, since this gives a unique glossy feel. Irregular cross-section yarn refers to a cross-sectional shape other than round, but the degree of irregularity defined by (diameter of circumscribed circle)/(diameter of inscribed circle) is 1.4 to 2 from the glossiness.
．． Particularly preferred are yarns with a triangular cross section of 0 and flat cross sections with an aspect ratio of 1.5 to 4.0.

The core yarn constituting the Kuslan yarn of the present invention has a strength of 2.7KH.
It is necessary to do more than that. If the strength of the core yarn is less than 2.7 kg, the durability of the Taslan yarn is insufficient and it cannot be used for automobile interior materials such as car seats. From this point of view, the strength of the core yarn is preferably 2.85 to 3 or more.

The core yarn used for the Taslan yarn of the present invention has an intrinsic viscosity (
IV) needs to be between 0.65 and 0.90. When the IV is less than 0.45, the molecular orientation of the core yarn must be increased in order to increase the strength of the core yarn to 2.7 to 9 or higher, which reduces the dyeability of the core yarn and makes it difficult to dye. When coloring, a large amount of dye is required, which poses a cost problem. Also, IV is 0°90
If the viscosity exceeds this value, the viscosity will be too high and it will not be possible to stably spin the yarn using a normal spinning machine. From this point of view, a more preferable range of IV is 0.
．． 70 to 0.80.

In addition to the requirements of the present invention described above, the taslan yarn of the present invention needs to specify the difference in dyeability between the core yarn and the decorative yarn.

If there is a difference in dyeability between the core yarn and decorative yarn,
For example, a problem arises in that the core yarn looks whitish after dyeing, leading to a decrease in product quality. Therefore, it is necessary to combine the core thread with a decorative thread that has little difference in dyeability.

As a result of examining various combinations of core thread and decorative thread in this way, the difference in L value between core thread and decorative thread ΔL = (LK LS)/
It has been found that specifying LK/c: and L') can improve the quality of Taslan yarn after dyeing. That is, as a result of the studies conducted by the present inventors, it has been found that in order to achieve the object of the present invention, it is necessary to combine the core yarn and decorative yarn such that ΔL is in the range of 0.04 to 0.22. Ta. Here, the darker the yarn after dyeing, the smaller the L value, but if ΔL is 0.
If it is smaller than 04, the core yarn will look thin and whitish compared to the decorative yarn, and the quality of the product will deteriorate.

On the other hand, if ΔL exceeds 0.22, the decorative thread will look thinner and whitish compared to the core thread, resulting in a decrease in quality.

Therefore, it is necessary to combine core threads and decorative threads that satisfy ΔL of 0.04 to 0.22.

As mentioned above, the Taslan yarn of the present invention has a strength of 2°7Kct.
Above, IV is 0.65 to 0.90 (7) polyester m
Although fibers are used as the core yarn, the method for producing the core yarn is not particularly limited. For example, polyester having an IV of 0.7 to 1.0 is spun while being slowly cooled to obtain an undrawn yarn of Δn of 5 to 15×10 −3 , and then the drawing temperature is 70 to 110°C, and the drawing step is 8
Stretch at a rate of 3°918 or less, then process at a temperature of 180°.
It is obtained by constant length or slow heat treatment at ~240°C with a relaxation rate of O~20%.

For such core yarn, while supplying decorative yarn with ΔL of 0.04 to 0.22 at an overfeed rate of 70 to 200%,
The taslan yarn of the present invention is processed to 1q by using a fluid turbulence nozzle at a pressure of 2 to 6Ny10#. In this case, it is more preferable to use a triangular cross-section yarn with a degree of irregularity of 1.4 to 2.0 or a flat cross-section yarn with an aspect ratio of 1.5 to 4.0 as the decorative yarn because a unique luster can be obtained. Further, when the birefringence (Δn) of the polyester fiber of the core yarn is set to 170×10 −3 or less, a Taslan yarn of very good quality can be obtained.

[Example] The present invention will be described in detail below with reference to Examples. Note that the physical properties in the examples were measured as follows.

A, Intrinsic viscosity (IV) Ortho-chlorophenol (hereinafter O
CP) 10mΩ for sample 0. - Melt 8 g,
It is determined from the relative viscosity (ηr) using the following formula using an Ostwald viscometer.

ηr=η/η0 = (t x d)/(toXdoJI
V=0.024277r+0.2634B0 Tensilon tensile testing machine UTM manufactured by Toyo Ballwing Co., Ltd.
Using Type-3, an S-8 curve was obtained at a trial length of 200 m and an elongation rate of 1100 y/min to determine the strength.

Difference in dyeability (ΔL) between C9 core yarn and decorative yarn (a) Either the core sheath composite bulky processed yarn is made into a wind shape, or (b) the raw yarn for the core yarn (S) and the raw yarn for the decorative yarn ( ) were each placed in a skein at a ratio of 35:65, and in the same bath, ND Auto BlueNal manufactured by Nagase was used as the dye and the ratio was 1:1.
200, 210 g of hydrosulfide after staining at 130 °C for 40 minutes at a concentration of 7% owf, and Na0)-10
, 5g dissolved in 1Ω of water was used for reduction cleaning at 80°C for 20 minutes. L of the core yarn and decorative yarn dyed in this way
If the values (for LS and L) are (a), the core yarn and decorative yarn are separated and made into skeins, and in (b), each skein is made of sM-color manufactured by Suga Test Instruments Co., Ltd. Measure using the OD method using a computer, and calculate ΔL8n using the following formula.

ΔL= (1 to LS)/L Example 1 As decorative thread (A) Polyester semi-dual round cross section thread 15
0-48-200 (manufactured by Toshiku Co., Ltd.), (B) 150-
36-3915 (manufactured by Toshiku Co., Ltd.) "Silk" and (
C) 250-48-300 (manufactured by Toshiku Co., Ltd.), polyethylene terephthalate chips with different IVs were melt-spun as the core yarn, and the spinning/drawing/heat treatment conditions were appropriately controlled to produce the product types and physical properties shown in Table 1. A multifilament was used. According to Table 1, ΔL of the core yarn and decorative yarn is shown. Using the polyester fibers shown in Table 1 as core threads, the decorative threads also shown in Table 1 were processed in the processing steps shown in FIG.

That is, using a core yarn 1 and a decorative yarn 2 made of polyester multifilament yarn, the decorative yarn is supplied with an overfeed rate of 100% to the core yarn, and is passed through the respective tensors 3 and 4 to the supply roller 5.6. supply The respective yarns are then passed through the fluid turbulence nozzle 9 with different overfeed conditions between the yarn feeding rollers 5, 6 and the take-off roller 10.
Taslan processing was performed at a pneumatic pressure of 5 Kg/cm N at a yarn speed of 60 m/min to form loops and tangles while mixing the fibers, and then winding with a winder 11 to obtain a Taslan processed yarn. This Taslan yarn is made into a skein shape and made into a Nagase ND.
Out.

Using BlueNQl, bath ratio 1:200, dye concentration 7%
Dyeing was carried out at an owfS dyeing temperature of 130'C for 40 minutes, and the difference in dyeability between the decorative yarn and the core yarn was visually determined, the strength of the taslan yarn after dyeing was measured, and the durability was determined. These results are shown in Table 1.

As shown in Table 1, Nα1 having an IV of less than 0.65 has a problem in the dyeability of the Taslan yarn when the Taslan processing force is increased. Moreover, Nα9 with an IV exceeding 0.9 could not be stably spun. If the strength of the rough Taslan processed yarn is Nα3 of 2.70 to 3 or less, the durability will be insufficient and it will not be usable. In general, when ΔL is less than 0°04 and Nα4.6, the core yarn dyeability of the Taslan yarn is insufficient and the quality is poor. In addition, in Nα8 in which the dyeability of the decorative thread is reduced, the core thread is dark and the decorative thread is too thin, resulting in poor quality. It can be seen that for Nα5 and 7, which use the same core thread as Nα6 and 8 but only change the decorative thread, Δ[ is within the range of the present invention and the product quality is improved to a satisfactory level. As mentioned above, the Taslan yarns with good dyeability and durability had an IVo of 65 to 0.90, and a core yarn strength of 2.
．． 7Kg or more, Nα satisfying Δ10.04 to 0.22
It was only 2.5.7.

[Effects of the Invention] In the present invention, sufficient strength can be achieved by specifying the IV and strength of the core yarn of the polyester fibers constituting the core sheath bulky yarn, and by combining the core yarn and decorative yarns with dyeability differences in a specific range. A taslan yarn having good durability and quality with good dyeability can be obtained.

The Taslan yarn of the present invention has excellent light resistance and is highly durable in that it maintains good mechanical properties even after long periods of use.
In addition, it has good dyeability and excellent fashionability, so it is particularly effective when applied to automobile interior materials.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a preferred manufacturing process for manufacturing the core-sheath bulky textured yarn of the present invention. 1: Core thread 2: Decorative thread wrapped around the core thread 3.4: Tenser 5.6: Yarn feeding roller 7.8: Moisture imparting device 9: Fluid turbulence nozzle (Taslan nozzle) 10: Take-up roller 11: winder

Claims (1)

[Claims] (1) It is a bulky processed yarn in which a decorative thread made of polyester fiber is wound around a core thread made of polyester fiber to form a loop, an arch, or a sag.
) is 2.7 kg or more, and the intrinsic viscosity of the core yarn is 0.65 to 0.
90, and a core sheath bulky processed yarn in which the dyeability difference ΔL between the core yarn and decorative yarn defined as below satisfies the following formula. 0.04≦ΔL≦0.22 [However, ΔL is the L value (Ls) of the core thread and the L value (Ls) of the decorative thread.
k) using the following formula = (Lk-Ls)/Lk]