JPS60458B2 - New polyester filament crimped yarn and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel polyester filament wound striped yarn and a method for producing the same. The present invention relates to a novel polyester filament wrapped yarn having a dry heat shrinkage rate of 5% or less at 200:00, and a method for producing the same.

Note that the elongation at break in the present invention is 5. of JISLI073.
5.1, and the dry heat shrinkage rate is a value measured according to JISLI073 5.12 (2) method B, with a standing time of 5 minutes in the dryer. 55% The polyester filament warp processed yarn of the present invention (hereinafter simply referred to as the processed yarn of the present invention), which has the above-mentioned high breaking elongation and excellent high-temperature thermal dimensional stability, is a novel processed yarn that has not been known in the past. A highly oriented, drawn polyester multifilament with a birefringence △n of 0.030 or more and less than 0.150 is heated at a temperature of 130°C or higher to give it warp, and then rolled under a low packing density. a stretched polyester multifilament with a birefringence △n of 0.150 or more; is heat-treated at a temperature of 150q0 or more to impart crimping, then sufficiently heat-set at a low packing density, and then the crimped filament is crimped from the crimped filament mass with a low tension of 0.5 ta'd or less. It can be manufactured by any of the drawing methods.

The highly oriented undrawn polyester multifilament with a birefringence △n of 0.030 or more and less than 0.15 degrees is a fiber-forming synthetic linear polyester, especially ethylene terephthalate, in which 80 mol% or more of the repeating units are ethylene terephthalate. It is easily produced by melting a polyester, especially polyethylene terephthalate, mainly consisting of t units at a high speed of 3,000 to 6,000 min. The polyester multifilament is produced by melt-spinning the fiber-forming synthetic linear polyester using a conventional method (weaving speed of about 500 to
1800/min) and then drawn (heat treated).

As described above, the processed raw yarn for producing the processed yarn of the present invention is a highly oriented undrawn polyester multifilament with a birefringence △n of 0.030 or more and less than 0.15 degrees, and a birefringence △n of 0.150. The above-mentioned ordinary drawn polyester multifilament is used, but the only difference in the manufacturing conditions of the processed yarn of the present invention due to the difference in processed raw yarn is that the lower limit of the heating temperature of the yarn at the time of crimping is different by 2000°. The other manufacturing conditions are essentially the same.

Therefore, for the sake of simplicity, the present invention will be representatively described below with reference to the case where highly oriented undrawn polyester multifilament is used as processed yarn. Birefringence △n is 0.0
When producing the processed yarn of the present invention using a highly oriented polyester multifilament with a grain size of 30 or more and less than 0.15 degrees Celsius as a processed yarn, first, the processed yarn is heat-treated at a temperature of 130 qo or more to impart crimp. .

The crimp imparting method is not particularly limited, but a push-in method or a heated fluid jet method that can impart crimp under moderate tension is preferred. Particularly from the viewpoint of achieving high processing speed, it is preferable to employ a heated fluid jet method using heated air or superheated steam. The processing temperature is selected from 13,000 to about 20,000 in order to provide crimp and sufficient heat setting, depending on the degree of orientation of the processed yarn. That is, the birefringence Δn of the processed yarn is 0.030 to 0.
．． In the low range of 060, 130 to 150oo, Δn is 0.
150-17000 in the intermediate range of 061-0.110
, 170 to 170 in the high region where Δn is 0.110 to 0.130.
It is better to set it to 200oo. In addition, when using a drawn yarn with a birefringence index △n of 0.150 or more as processed raw yarn, 1
It is preferable to employ a processing temperature of 50 to 230 qo, particularly 170 to 21,000 qo. When the processing temperature is less than 130 qo when using a highly oriented undrawn polyester multifilament, and 150 qo when using a stretched polyester multifilament, the processed yarn of the present invention has the above-mentioned high elongation and low heat shrinkage properties. can't get it. In the present invention, the provision of winding stripes substantially improves the gathering properties of the untwisted multifilament and improves the handleability and weavability of the processed yarn.

In addition, when using a low-oriented undrawn polyester multifilament with a birefringence △n of less than 0.03 degrees as the processed yarn, this filament cannot withstand the high temperature processing conditions of the present invention and shrinks extremely. As a result, the textured yarn of the present invention having the above-mentioned physical properties cannot be obtained. For heat setting under low packing density following crimping, it is best to use a vertical heating residence method using a heating fluid or a heating relaxation device.The heating method requires a long residence time, so method is preferable.

The heating temperature is preferably the same as or higher than the temperature in the crimp imparting step in order to achieve sufficient heat setting. The heating residence time in the heat setting step is approximately 8 to 2M sand, especially 10 to 19
Requires sand. Such long-time heat setting at high temperatures is a severe heat setting condition that cannot be imagined from the common sense of heat setting in conventional fabricated yarn production, which is carried out at high temperatures for short periods of time or at relatively low temperatures. This heat setting is performed while slowly advancing the crimped multifilament in a state of low packing density (that is, in a state in which it is folded at a density that does not cause uneven heating and is substantially untensioned). After heat setting, the crimped yarn mass is naturally or forcedly cooled to room temperature, and then pulled out using a diffuser or the like at a low tension of 0.5 ta'd or less, especially 0.3 ta'd or less, and wound appropriately. Roll it up on the pick-up device.

If the lumpy thread is drawn out with a tension exceeding 0.5/d, the thread will be stretched more than necessary, which will not only make it impossible to satisfy the high elongation properties of the present invention, but also Dimensional stability also deteriorates. Another method that is effective in carrying out the present invention is to attach an appropriate amount of water or a swelling agent to the filament that has been given a winding immediately before the heat setting process, so as to reduce the elongation at break of the processed yarn by 5 to 10%. There are ways to increase the degree.

Further, in order to improve the east-gathering properties of the processed yarn, interlacing treatment may be performed after drawing it under low tension. The weave of the processed yarn of the present invention is not particularly limited, but the total fineness is usually 50 to 150W.
In particular, it is preferably in the range of about 75 to 15. The processed yarn of the present invention thus produced has a birefringence of △ as a processed raw yarn.
When using a highly oriented undrawn polyester multifilament with n of 0.030 or more and less than 0.15 degrees, the birefringence Δn is 0.100 to 0.14, especially 0.110 to 0.1.
30. Elongation at break is 55% or more, especially 80 to 100%, and dry heat shrinkage at 200qC is 5% or less, especially 1%
or less, and the birefringence Δn of the processing source yarn is 0.1
When using a stretched polyester multifilament of 50 or more, the birefringence Δn is 0.100 to 0.140, especially 0.120 to 0.140, the elongation at break is 55% or more, especially 60 to 80%, and The dry heat shrinkage rate at 200oC is 5% or less, especially 1% or less, and the characteristics of conventional jet-flow crimped yarn for clothing (birefringence △n around 0.145, elongation at break around 45%, 200oC Dry heat shrinkage rate (%)
The physical properties are significantly different from that of the woven fabric, and it is useful in special fields where high elongation and thermal dimensional stability at high temperatures are required, such as the weft of reinforcing fabrics for rubber, plastic, etc. used in industrial applications. It can be widely applied to fields such as tire cords, urethane foam moldings, special hoses, and special rubber products.

Note that the processed yarn of the present invention obtained by using highly oriented undrawn polyester multifilament as a processed raw yarn has particularly high elongation as described above, so it is particularly suitable for application fields that require high elongation characteristics. Are suitable.

Example 1 Intrinsic viscosity 0.60 (phenolnotetrachlorethane=
Polyethylene terephthalate (measured at 3000 in a mixed solvent of 3 to 2) was melt-spun using a spinneret with 0.25 holes and 30 holes at a spinning temperature of 290°C, and the spun yarn was placed directly below the spinneret. After cooling with a cooling air stream, it was wound up with a Takato winder.

At this time, three types of highly oriented undrawn polyester multifilaments (processed yarns A to C) as shown in Table 1 were obtained by varying the discharge amount and winder winding speed (paper yarn speed). Next, these three types of processed raw yarns are vertically wound into a winding chamber using a superheated steam jet method under the processing conditions shown in Table 2.
After the cord was wound by continuous introduction at a speed of 200 m'mjn, the cord was introduced into a heating setting chamber and heated under the heat setting conditions shown in Table 2 under a low packing density (substantially tensionless folded shape). After being heat-set and then cooled by a stream of air at room temperature, the crimped filament was pulled out from the crimped filament at a low tension of 0.2 m/d and wound into cheese.

Table 2 shows the physical properties of the polyester filament crimped yarn thus obtained.

As shown in Table 1 and Table 2, the processed yarn produced according to the present invention using highly oriented undrawn polyester multifilament as a processed raw yarn has an extremely high elongation property with a breaking elongation of 80% or more. Moreover, the dry heat shrinkage rate at 200 pm C was 1% or less, which indicates that it also has excellent thermal dimensional stability.

Example 2 Polyethylene terephthalate multifilament (15M/
3, birefringence Δno. 160) was processed using a superheated steam jet method at a processing temperature of 180oC and a superheated steam flow rate of 10.2k9/
After being continuously introduced into the vertical winding chamber at a speed of 1100 m/mm to impart crimp, it is introduced into the heating setting chamber and set at a setting temperature under a low packing density (substantially tension-free folded shape). 18,000, heat-set with a heating residence time of 13.2 seconds, then cooled by air flow at room temperature, and then the wound filament was pulled out from the wound striped filament mass with a low tension of 0.2 ta'd and wound into cheese. Ta.

The polyester filament crimped yarn thus obtained has a grade of 22M/3 and a birefringence of Δno. 130
Breaking elongation 68%, dry heat shrinkage rate 0.5% at 200℃
Met.

Claims (1)

[Claims] 1. Birefringence Δn is 0.100 to 0.140, elongation at break is 55% or more, and dry heat shrinkage rate at 200°C is 5%.
A novel polyester filament crimped yarn characterized by the following: 2 Highly oriented unstretched polyester multifilament with a birefringence Δn of 0.030 or more and less than 0.150 at 130°C
Crimp is imparted while performing heat treatment at the above temperature, followed by sufficient heat setting at a low packing density, and then the crimped filament is pulled out from the crimped filament mass with a low tension of 0.5 g/d or less. Characteristic birefringence Δn is 0.10
0 to 0.140, elongation at break of 55% or more and 200℃
A method for producing a new polyester filament crimped yarn having a dry heat shrinkage rate of 5% or less. 3. Stretched polyester multifilament with a birefringence Δn of 0.150 or more is heat-treated at a temperature of 150° C. or higher to impart crimps, then sufficiently heat-set at a low packing density, and then a crimped filament mass is formed. A birefringence Δn of 0.100 to 0.140, a elongation at break of 55% or more, and a dry heat shrinkage rate at 200°C, characterized by drawing out a more crimped filament with a low tension of 0.5 g/d or less. is 5
% or less of a novel polyester filament crimped yarn.