JPS61266629A - Production of fancy 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 Application Field> The present invention relates to a method for producing spun-like fancy yarn that can improve the volume and warm feel of a fabric and impart novel surface changes.

<Prior art> It is well known that fluid treatment is applied to multifilament yarn to generate fuzz due to loops and slack on the yarn surface to give it a spun-like texture. Processed yarns are widely used in the clothing field.

<Problems to be Solved by the Invention> However, in recent years, with the diversification and increasing luxury of consumer tastes, there has been a strong demand for a texture that has a varied appearance rather than a monotonous appearance, and even an improved sense of volume. However, fabrics obtained from yarns with many loops and slacks on the yarn surface have an improved sense of volume, but on the other hand, they have a strong so-called bursy feel,
It was far from the desired soft voluminous feel.

Moreover, since multifilament yarn is uniform in the longitudinal direction, the monotonous appearance of the fabric obtained from it is disliked, and the above-mentioned attempts to obtain an appearance with irregularities and a natural pattern pattern similar to that of fabric with natural spun yarn are disliked. The request could not be met.

The present invention is intended to eliminate the drawbacks of conventional processed yarns, and the purpose is to create a soft, voluminous and warm feel similar to that of multifilament yarns and natural spun yarns, and to bring graceful changes to fabrics. The present invention provides a method for producing fancy yarns that can be coated.

<Means for Solving the Problems> In other words, the present invention performs intermittent false twisting on multifilament yarn to create a twisted convergent portion and a non-twisted portion converged by S twist or Z twist in the longitudinal direction. First, a large number of loops and entanglements are created by overfeeding the multifilament yarn and performing fluid treatment.

Alternatively, it is a method for manufacturing fancy yarn characterized by forming slack.

The method of the present invention will be further explained in detail below.

First, in the method of the present invention, a multifilament yarn is intermittently subjected to a false twisting operation to alternately form twisted and untwisted portions in the Sl: or Z twist in its longitudinal direction.

In the present invention, a two-gap false twisting operation is performed to form alternating twists in the yarn due to a false twisting transient phenomenon.

Here, the process of forming alternate twists will be explained. First, during false twist heating, a twist in the opposite direction to the false twist heating direction is formed in the yarn, and then the transition state changes from a transient state to a steady state (the number of false twist heating and untwisting number become equal), and the yarn becomes It becomes untwisted. When the false-twisting operation is then stopped, the yarn that was in the false-twisting heating region at the time of stopping passes through the twisting device as it is, and a twist in the false-twisting heating direction is formed in the yarn.

Then, after the twist in the false twist heating direction is removed, the yarn becomes a non-twisted yarn. In the above case, the two-intermittent false-twisting operation heats in only one direction, and the heating-stop cycle is repeated, but the two-intermittent false-twisting operation heats the heating direction in the S-Z7JO twist 1. It may also be a cycle. Further, intermittent false twisting operations may be performed by arbitrarily combining S heating, Z heating, and stopping. In any of these cases, the principle of adding twist to the yarn is the same as the above-mentioned case of performing intermittent false twisting by heating in only one direction, and it is necessary to leave enough twist to bundle the yarn. I can do it.

The length and frequency of the converging portion and non-twisting portion of the yarn are determined by the intermittent false-twisting operation time, the length of stop time, the frequency, and the yarn speed. Intermittent false twisting operations can be arbitrarily set using the transmitting device and changed as appropriate.

As a twisting device used for intermittent false twisting operations.

Intermittent false twisting operations can be performed easily and instantly.
A so-called air false twist nozzle using an air swirling flow is preferred because of its durability.

In addition, in the method of the present invention, a thermoplastic synthetic fiber multifilament yarn is used as the multifilament yarn, and a heating device is provided upstream of the twisting device to heat-treat the thermoplastic multifilament yarn while intermittently temporarily Twisting operations can also be applied, and in this case, in addition to the twisting effect, heat shrinkage effects and crimp effects due to heating, heat setting, and untwisting are added, synergistically increasing the focusing effect and texture effect. As a result, a structurally stable fancy yarn can be obtained.

Next, the intermittent false-twisted multifilament yarn is over-fed and subjected to fluid treatment to generate a large number of loops, entanglements, or slack in the yarn.

In this case, if the overfeed rate is too low, loops and slack will not form, and if it is too high, there will be less entanglement,
Massive neps are likely to occur, which may deteriorate the quality of the woven or knitted fabric.

Therefore, the overfeed rate is preferably 5 to 100%.

Further, the fluid treatment is performed by jetting a fluid such as compressed air using a jet nozzle such as an interlaced nozzle or a taslan nozzle, thereby making it possible to impart loops and slack to the yarn.

In this way, the jetting fluid is applied to the multifilament yarn, which is alternately twisted by the intermittent false twisting operation and has alternating twisted and untwisted areas, where the number of twists changes along the longitudinal direction of the nine yarns. Then, a bulky yarn is obtained in which the degree of opening of the fancy yarn differs depending on the degree of twisting, and the size of loops and slack formed by the length of the twisting pitches differs. When a multifilament yarn without twist is treated with a jet fluid, it becomes a yarn with large overroll loops.

The method of the present invention suppresses overroll loops.

Can be reduced. The yarn produced by the method of the present invention is as follows.

The apparent yarn diameter decreases due to the presence of the above-mentioned alternating twists.

It is thought that the reduction of the overroll loop substantially contributes to the thickness of the resulting fabric, and conversely, it is imparted with elasticity and thickness, and the voluminous feel of the fabric increases on the contrary.

Note that the overroll loop here refers to a loop that protrudes from the diameter (Dc) of the intersecting part of the axis as shown in Figure 2, and the size of the overroll loop depends on the size of the overroll loop diameter (DL). shown.

FIG. 3 is a schematic external view showing an example of the fancy yarn produced by the method of the present invention, in which (A) shows a threaded part having a twist in the direction opposite to the direction of heating for false twisting, and (C) shows a part twisted in the direction of heating for false twisting. The untwisted part (A) and the untwisted part (C) are formed alternately along the longitudinal direction of the yarn, and the untwisted part (A) and the untwisted part (C) are The twist part (C) has a thin kana over roll loop (Ll) due to the twist pitch of the alternating twist.
is formed.

Between the twisted part (A) and the untwisted part (C), there is a non-twisted part (B
) and non-twisted parts (Bo) which are not subjected to any twisting action are formed alternately. These untwisted parts (B).

Since (Bo) is not subjected to a focusing action, the overroll loop (L2) forms a large part of the yarn, and the yarn as a whole is rich in variations in unevenness.

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention, in which the multifilament yarn (F) drawn out from the burn (1) passes through the supply roller (2). The twisting device (
3), a false twisting operation is performed intermittently, and the material is taken up by the first delivery roller (4). At this time, when the multifilament yarn (F) has thermoplasticity, a heating device such as a heating plate is installed between the supply roller (2) and the twisting device (3) to perform heat fixation and stabilize the alternate twisting. It may be made into Next, between the first delivery roller (4) and the second delivery roller (6), the injection nozzle (5) is in an oversupply state.
The yarn is subjected to fluid treatment to form loops and slack, and then passed through the second delivery roller (6) to the winding roller (7).
is rolled up into a puff cage (8).

The multifilament yarns used in the present invention include thermoplastic synthetic fiber multifilament yarns such as polyester and polyamide, and recycled fiber multifilament yarns such as rayon and cupro. It also includes highly oriented undrawn yarns.

<Example> The present invention will be explained in detail below by way of nine examples.

Example polyester multifilament yarn 150d/72f
was heated by a heating device provided between the supply roller and the rotating nozzle under the conditions shown in Table 1, and compressed air was intermittently injected from the rotating nozzle to perform an intermittent false-twisting operation. At this time, the intermittent false-twisting operation was performed as unidirectional heating (Z direction) according to a command from a microcomputer into which a signal was previously input. Subsequently, loops and slack are formed in the multifilament yarn above using an air jet nozzle.

A fancy yarn was obtained in which the form and frequency of loops and sags were non-uniform along the length of the yarn. The twisted convergent portion, non-twisted bulky portion, and apparent yarn diameter ratio (maximum value of bulky portion/concentrated portion) of the obtained fancy yarn were as shown in Table 2.

Table 1 Table 2 The resulting fancy yarn has a density of 88 threads/inch.

When woven into a 2/2 twill structure with a weft density of 76 threads/inch, the resulting fabric had an appearance with a ground pattern formed by surface irregularities, was soft to the touch, and had a rich sense of volume and warmth. Met.

<Effects of the Invention> As described above, the method of the present invention performs intermittent false twisting on multifilament yarn to form twisted convergent portions and non-twisted portions, and then performs fluid treatment to form loops and slack. As a result, loops and slacks are formed in the yarn having a controlled twist pitch due to the alternate twisting. By creating a difference in gloss due to the mixture, it gives an extremely novel surface effect.

By reducing the overroll loop, elasticity and thickness can be imparted to the fabric, and the voluminous feel and warm feeling can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention, Fig. 2 is a schematic diagram of the external appearance of yarn subjected to fluid treatment, and Fig. 3 is an example of fancy yarn obtained by the method of the present invention. FIG. (1) Pern (2) Supply roller (3) Twisting device (4) First delivery roller (5) Spray nozzle (6) Second delivery roller (7) Winding roller (8) Package (F) Multifilament yarn (A ) Untwisted part (B), (B') Untwisted part (C) Untwisted part

Claims (1)

[Claims] 1. The multifilament yarn is subjected to intermittent false twisting to alternately form twisted convergent portions and non-twisted portions converged by S twist or Z twist in the longitudinal direction, and then A method for producing fancy yarn, which comprises overfeeding multifilament yarn and subjecting it to fluid treatment to form a large number of loops, entanglements, or slacks. 2. The method for producing fancy yarn according to claim 1, wherein the multifilament yarn is a thermoplastic synthetic fiber multifilament yarn, and the false twisting operation is performed while being heat-treated.