JPS5865022A - Production of special 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 a method for producing a false twisted crimped yarn having a special shape and performance.

Conventionally, K is the temperature for obtaining crimped yarns, generally called partially crimped yarns, intermittent bulky yarns, and continuous untwisted yarns, that is, false twisted yarns having untwisted portions or overly untwisted portions.

It is possible to change the number of twists, tension, etc., and the method most used for floor desks is to cause partial fusing of the yarn by high-temperature false twisting, and to take advantage of the untwisting unevenness during untwisting. there were. However, since this method involves false twisting at a high temperature, the processed yarn is coarse and hard, and a product with a soft texture could not be obtained using this yarn.

Recently, as a means to solve these problems, attempts have been made to vary the tension of the yarn during the false-twist and crimping process, thereby obtaining the above-mentioned untwisted yarn at normal false-twist and crimping temperatures. However, if the tension change is small, there will be little change in the yarn, and even if the tension change is increased, the yarn will not change.If the tension change is made faster, the yarn will become slack when the tension is relaxed. There are many problems such as heavy twisting and yarn breakage, and it is currently not possible to commercialize it.

The present invention has solved these problems, and the gist of the invention is that when false-twisting thermoplastic synthetic fiber yarn, the maximum value of the i-shaped width of the yarn length in the untwisting region is The present invention provides a method for producing a special false twisted yarn, characterized in that the value is varied within a range of 25- or more.

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

FIG. 1 is a side view showing an example of an apparatus used in carrying out the present invention, in which 1 is a supply system, 2 is a feed roller, 3 is a heater, 4 is a spindle, and 5 is a yarn running in the untwisting area. A moving guide for changing the length, 6 a fixed guide, 7 a delivery roller, 8 a winding drum, and 9 a winding package.

This configuration is the same as a normal false twisting machine except for the movable guide 5, and the yarn runs along the solid line from the spindle 4 to the fixed guide 6, yielding 2 normal false twisted yarns. The moving guide 5 is an important feature of the invention, and will be explained in more detail below.

In Fig. 1, the moving guide 5 is reciprocating between A and B, and when the moving guide 5 remains at A, it is the same as a normal false twisting machine, and the resulting yarn The threads are also ordinary false twisted yarn. This moving guide 5 is A,
A feature of the present invention is that the yarn length in the untwisting region is changed by reciprocating between H. To be more specific, when the moving guide 5 moves from point A to point B, the yarn length in the untwisting area becomes longer, and at the same time, the yarn speed in the untwisting area increases due to the moving speed of the moving guide. The untwisting action by the rotating spindle 4 is reduced, and the twist formed in the heated area between the spindle 4 and the feed roller 2 is not completely untwisted, resulting in an untwisted portion.

When the moving guide 5 reaches point B, the yarn length stops increasing, and the yarn runs in the state indicated by the broken line in FIG. 1 with a stable yarn length.

In other words, although the moving guide passes through a yarn path that is different from the yarn running direction at point A, there is no change in yarn length, and the problem is unresolved at point B.

A crimped yarn without twisting or over-untwisting can be obtained. However, since the yarn passes through point B, the untwisted tension of the yarn becomes higher than that at point A, resulting in a crimped yarn that is different from the crimped yarn at point A.

When the moving guide 5 is moving from point B to point A, the yarn length in the untwisting region is decreasing.

This state is decreasing from the yarn length at point B, and at the same time is related to the moving speed of the moving guide 5.

Since the yarn speed in the untwisting region decreases, over-untwisting portions are formed.

One of the features of the present invention is that the yarn length is changed in the untwisting region. When trying to change the yarn length in the heating area, the yarn in the heating area is only being heated and heat-fixed, so the elasticity of the yarn is only due to the overfeed from the feed roller. There is no elasticity due to crimp development, the width by which the yarn length can be increased is extremely small, and when attempting to decrease the yarn length, yarn breakage is likely to occur due to the occurrence of double twist, etc. Therefore, the range of change in yarn length is limited compared to the untwisting region, and there is little change in yarn shape due to untwisting or over-untwisting. Even when increasing the yarn length, the yarn itself is crimped, so the increase is large, and even when decreasing the yarn length, yarn breakage due to double twisting etc. does not occur.
It is possible to take a yarn length change width that can sufficiently change the yarn form.

Table 1 (ml, (bl) is a summary of the yarn length change width in the heating zone and untwisting zone and the resulting yarn shape change. The test was carried out between the heater 3 and the spindle 4, where the effect on change is most likely to be produced.

[Table 1] (al Yarn length change in the heating zone (b) Yarn length change in the untwisting zone *1 The yarn length change width is the maximum yarn length change in the heating zone and untwisting zone with respect to the yarn length of normal false twisting. It is expressed as a percentage of yarn length.

×2 The yarn length change speed was the same as the yarn speed.

From Table 1, it is clear that it is advantageous to change the yarn length in the untwisting area, and when considering industrial production, for example, in the heating area, that is, between the spindle 4 and the feed roller 2.
A variation width of 0% is a variation width that is difficult in terms of workability.

Table 1 shows that when the yarn length is changed in the untwisting region, the maximum value of the yarn length change width is required to be 25 inches or more even if the yarn speed is the same as the yarn length change speed. In particular, when the yarn length change width is less than 10, no change is observed in the yarn form and the effect is small. The reason for this is that even if the yarn length change speed is the same as the yarn speed, the yarn length change width is small, so untwisted areas or over-untwisted areas are unlikely to occur (
Even if it were to occur, it is considered that it would disappear due to the frictional resistance caused by the moving guide 5. When the yarn length change width is about 1591, the yarn becomes a crimped yarn with more convergence than normal false-twisted yarn, and although some differences in shade appear when dyed, there is no difference in yarn form. Therefore, in order to have a difference in yarn form, the maximum value of the width of change in yarn length must be 25% or more. At 25% or more, thin parts with high convergence due to untwisted parts and over-untwisted parts are generated, resulting in a difference in form from the crimped parts.

Table 2 shows the effect of the speed at which the yarn length is changed on the yarn form, assuming that the maximum change width of the yarn length is 30 inches.

[Table 2] Table 2 shows that the rate of change in yarn length that can cause a change in yarn shape is more remarkable than the yarn speed.

That is, even if the range of change in yarn length is sufficient, the faster the speed at which the yarn length is changed, the easier the shape change will be.

As is clear from Table 1 (b) and Table 2, this was carried out within the range where the maximum value of the change in yarn length was 25 inches or more.

Moreover, by setting the rate of change of the yarn length to be higher than the yarn speed, one reciprocation of the moving guide 5 creates crimp portions 11, 13, as shown in FIG.
Untwisted part 10. Over-untwisting portions 12 appear, resulting in a yarn with rich morphological design, and it is also possible to create shading differences through dyeing. Furthermore, since the present invention does not require false twisting at a high temperature as in the conventional method, the product does not become rough and hard and has an excellent texture.

The speed of change in yarn length affects the yarn form, and the untwisted part at high speed,
Each length of the over-untwisted portion becomes shorter and at the same time the number of twists becomes higher. Therefore, by making the rate of change of the yarn length non-uniform, as shown in FIG.
The crimped portions 13 and 14 can be made to appear randomly, and if the rate of change in yarn length is made non-uniform at a speed higher than the yarn running speed, untwisted portions with non-uniform length can be formed as shown in Fig. 4. 10° crimp portion 11. Over-untwisting portion 12 and crimp portion 13 can occur at the same frequency.

It should be noted that making the speed at which the yarn length is changed non-uniform can be easily achieved by sending a pulse signal using a random signal, and any means such as light, sound, or mechanical means may be used for the random signal.

According to the present invention, color shading can be achieved at the same time as the form design effect due to untwisted parts and over-untwisted parts.

A product with excellent texture can be obtained, but it is also possible to obtain a yarn with only an untwisted portion and a crimped portion, or a yarn with only an over-untwisted portion and a crimped portion.

That is, when the increasing speed of the yarn length is made smaller than the decreasing speed, the yarn becomes as shown in FIG.

The second reason is that the decreasing speed of the yarn length is preferably higher than the yarn speed.
This is clear from the results in the table. Even if the yarn length decreases at a speed higher than the yarn speed, the elasticity of the yarn due to the crimp obtained by the 8 points in FIG.

The yarn does not wind around the delivery roller 7 even in a considerable speed range.The increasing speed of the yarn length may be any speed slower than the yarn speed depending on the purpose and is not limited in any way.

The characteristics of the yarn in only the over-untwisted part and the crimped part are that although there is some twisting due to over-untwisting, the yarn in the over-untwisted part has crimps after being untwisted once, and only in the over-untwisted part. It has unidirectional torque due to

Yarns having only untwisted portions and crimped portions, as well as yarns having only unidirectional torque, are extremely useful in producing, for example, cypress fabrics.

By making the increasing speed of the yarn length thicker than the decreasing speed (K), it becomes possible to obtain a yarn with only untwisted portions 10 and crimped portions 14 as shown in FIG. 5. At this time, the yarn length increases. Although the speed needs to be higher than the yarn speed, the decreasing speed may be performed at any speed that is slower than the yarn speed.

As mentioned above, the untwisted part has almost no crimp (it is shiny because it is almost like raw silk) because the twist in the heated area is not completely untwisted.

According to the present invention configured as described above, various changes such as morphological changes due to untwisted portions, over-untwisted portions, and crimped portions, 2-hue shading differences, torque development direction differences, light-brightness differences, etc. can be easily imparted. It has the remarkable effect of being able to.

Example 1 Polyester filament 150 denier 48 filament was used and false twisted using the apparatus shown in FIG. 1 under the following conditions.

False twisting model BT-5 (manufactured by Mitsubishi Heavy Industries) Spindle rotation speed 25X10 rpm Number of twists 25
00 T/M (Z) Heater temperature 210℃ Overfeed rate +4.51G Maximum tongue width of moving guide 5 10CIK Yarn length change speed 100? F! /min.

The obtained thread had a thread form as shown in FIG.

Average length of untwisted part 10 is 23 CIL* Average number of twists is 8
40T/M(Z)? The average length of the t-par untwisted portion 12 was 21α, and the average number of twists was 1080 T/M (8).

Example 2 Using the same yarn as in Example 1, false twisting was performed using the apparatus shown in FIG. 1 under the following conditions.

False twisting model BT-5 (manufactured by Mitsubishi Heavy Industries) Spindle rotation speed 25X10 rpmIa Number 25
00 T/y1 (Z) Heater temperature 210°C + Overfeed rate 4.5 Max. The yarn has the shape shown in Fig. 3.

Average length of untwisted part lO is 19 twists, average number of twists is 930T/M
(Z), the average length of the over-untwisted portion 12 is 15 cILl, the average number of twists is 1160 T/M (Z) "l?"

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an apparatus used in carrying out the present invention, and FIGS. 2 to 6 are side views showing various examples of special false twisted yarn obtained by the present invention. In FIG. 6, l is the supply system, 2G'! Feed roller, 3 is heater, 4
is the spindle. 5 is a moving guide, 6 is a fixed guide, 7 & 1J belly roller, 8 is a winding drum, 9 is a winding cage, 1
0 is the untwisted part, 11.13.14 is the crimped part. Reference numeral 12 denotes an over-release part. Valen l figure threat 2 figure + 3 eyes 4 days

Claims (1)

[Claims] Iccho (1) When false-twisting thermoplastic synthetic fiber yarn, the yarn length in the untwisting region is changed within a range where the maximum value of the change is 25 degrees or more. A special manufacturing method for false twisted yarn. (2) The method for producing special false twisted yarn according to claim 1, wherein the rate of change in yarn length is greater than or equal to the traveling speed of the yarn. (3) A method for producing special false twisted yarn according to claim 1 or 2, wherein the rate of change in yarn length is non-uniform. (4) The method for producing special false twisted yarn according to claim 1, wherein the rate of increase in yarn length is smaller than the rate of decrease thereof. (5) The method for producing special false twisted yarn according to claim 1, wherein the rate of increase in yarn length is greater than the rate of decrease thereof.