JPS62133135A - Production of fluid false twisted processed 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 [Industrial Field of Application] The present invention relates to a method for producing false twisted yarn for the purpose of novel texture and appearance effects such as a crisp feel, an uneven feel, and a grain effect.

[Conventional technology]

Traditionally, woven and knitted fabrics characterized by crispness, unevenness, grain effects, etc. have been produced using a variety of thread-threading techniques, such as highly twisted threads using a twisting machine, or variations in thread twisting.

[Problem that the invention seeks to solve]

However, these methods have extremely low productivity, problems with quality and process control, and are extremely expensive.

Therefore, in order to improve productivity, there is a method of using false twisting technology to twist the crimped yarn with a low number of twists, but this increases the number of steps and does not lead to cost improvement. S-2 alternately twisted yarn, which is partially fused by false twisting at a heat setting temperature near the melting point, has also been proposed.
Since this method also takes the extreme method of heat fusion, the texture and appearance are significantly different from those obtained by strongly twisting yarn using a yarn twisting machine, and the yarn is rough and hard, and is inferior in quality.

[Means for solving problems]

The present invention solves these problems by using a swirling flow nozzle, and provides a simple manufacturing method using a swirling flow nozzle. When false-twisting the yarn, the heat treatment temperature T (°C) in the heating range is T/-20≦T≦TP+10 (where T/ is the softening point temperature of the fibers constituting the yarn in °C). There is a manufacturing method for fluid false twisted yarn.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of an embodiment for manufacturing a fluid false twisted yarn of the present invention.

The raw yarn (1) is fed by a feed roller (2), subjected to a predetermined heat treatment by a first heater +31, and false twisted by a swirl nozzle (4).

Then, it passes through the first delivery roller (5) and
The setting is performed by the heater (6), and the false twisted yarn (9) is wound up by the wind roller (8) via the second delivery roller (71).However, depending on the application, the second heater (6) may be used. Alternatively, it may be directly wound up from the first delivery roller (5).

In the above method, the reason why a swirling flow nozzle is used instead of the spindle used in normal false twisting is as follows.

The present invention is to obtain a novel S-2 alternately twisted yarn in which untwisted portions and untwisted portions coexist, and when a spindle is used, the yarn is wound around a pin for false twisting. Untwisting is convenient for obtaining rolled yarn, but the shape of the yarn imparted by squeezing at the pin part is easily destroyed, and it is susceptible to high tension due to rubbing, which makes it difficult to achieve the purpose of the present invention. is inconvenient.

In the case of the swirl flow nozzle, the heating body is a fluid and is heated by the balloon moving bed of the yarn, so that processing can be performed under low tension and without being subjected to squeezing, so that a good S-Z alternately twisted yarn can be obtained.

Next, the heat treatment temperature T°C in the heating region is set around the softening point temperature T/ of the constituent fibers of the yarn, that is, in the range of T/-20≦T≦TI+10. If the yarn is processed at a temperature lower than this range (near the melting point), the yarn will fuse and become similar to the rough and hard S-Z alternately twisted yarn that can be obtained with a normal spindle method. In addition, if the temperature is low, the yarn is not sufficiently plasticized and the setting effect is low, so a good S-Z alternating twist effect is not expressed, and the texture is soft and similar to crimped yarn. This is because.

Further, the pitch of the S-2 alternate reversal affects the quality of the product. False twisting is usually performed by heat treatment in a heated state, a cooling zone is provided between the heater and the heating element for fixation, and untwisting is performed after cooling. However, the yarn is actually in a traveling state, and as it passes through a limited distance, it reaches the untwisting region while being slowly cooled, and the alternate twisting of S.2 causes reverse unevenness. Therefore, we focused on the fact that the heating element is a compressed air fluid and that forced cooling is possible, and as shown in Figure 2, a swirling flow nozzle is placed close to the terminal end of the heater to perform vibration, heat treatment, instant cooling, and untwisting. As a result, the S-Z alternately reversed pitch has almost no reverse unevenness, and a fine-grained S-2 alternately twisted yarn can be obtained. By the way, when comparing the case where the swirl flow nozzle is used in the normal spindle position and the case where it is directly connected to the end of the heater, the S-Z alternately reversed twists are less than 10 per inch in the former and the length is irregular. In contrast, the latter was relatively uniform when there were 10 or more pieces, and when it was made into a woven or knitted fabric, the quality was significantly improved.

The nozzle to be used is not particularly limited as long as it generates a swirling flow, but when it is placed close to the end of the heater, the direction of fluid discharge is opposite to that of the heater, as shown in Figure 3. It is effective to use a propulsion-type swirling flow nozzle that has the following (travel direction of the yarn). (10) in Figure 3
(11) is a thread guide hole, (11) is a fluid injection hole, and the direction of the arrow indicates the running direction of the yarn.

〔Effect of the invention〕

Since the present invention uses a swirling flow, it is possible to perform false twisting with low tension and without being subjected to ironing, and by setting a specific false twisting temperature, S-Z alternating twist crimping with a soft texture can be achieved. Yarn is obtained. Furthermore, when performing the swirling flow treatment immediately after the heater, it is possible to perform forced cooling on the heated and heat-set yarn, resulting in fine-grained S-2 alternately twisted crimped yarn without uneven reversal, etc. The effects of the present invention are profound.

〔Example〕

Next, the present invention will be specifically explained using examples.

Example 1 Acetate filament yarn of 200 d/34 f was subjected to fluid false twisting according to the method shown in Fig. 1 and Fig. 2 under the following conditions, and a plain woven fabric was made using this yarn. A voile-like fabric with a moderate crispness and grain effect was obtained. On the other hand, the method shown in Figure 1 has a rustic appearance with a few knots here and there, while the method shown in Figure 2 has a fine uneven effect with a uniform grain pattern, giving it a high quality appearance. It was a high value.

Processing speed near 5m/min Processing temperature: 1st 235℃/2nd 235℃ Pneumatic crab 2.5 kg/cm" Overfeed rate = (1st) + 10% / (2nd) ±0
%/(W,R)+1%Example 2 Using a polyester filament yarn of 150 d/48 f, a satin-textured fabric was made using a yarn obtained by fluid false twisting using the method shown in Figure 2 under the following conditions. As a result, a fabric having a georgette-like texture and appearance was obtained.

Processing speed: 100m/min Processing temperature: 1st, 240℃ / 2nd, 240℃ Pneumatic crab 4 kg/l Overfeed rate = (1st) + 20% / (2nd) + 1
%/(WR)+2%

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of an embodiment of the method for producing a fluid-folded yarn of the present invention, and FIG. 2 is a method for producing fluid-folded yarn by providing a fluid nozzle at the end of the first heater. FIG. 3 is a schematic longitudinal sectional view showing an example of the swirl flow nozzle used in the present invention. 1, raw yarn 2, feed roller 3, first heater 4, swirl flow nozzle 5, first delivery roller 6, second heater 7, second delivery roller 8, wind roller 9, false twisted yarn 10, yarn Road hole 11, injection hole blue 1 Figure + 3 button

Claims (2)

[Claims] (1) When performing false twisting using swirl flow, the heat treatment temperature T (°C) in the heating area should be set to Tg-20≦T≦Tg+10 (however, T
g is a process for producing a fluid false-twisted yarn, characterized in that false-twisting is carried out within the range of the softening point temperature of the fibers constituting the yarn (°C). (2) The manufacturing method according to claim 1, wherein the false twisting process is performed using a swirling flow at a position close to the end of the heater.