JPH0711092B2 - False twisting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method in which a thermoplastic synthetic fiber different shrinkage mixed yarn is subjected to false twisting, and subsequently subjected to a stretching treatment to be processed with a single processing weight. Nevertheless, the present invention relates to a method for rationally producing a specially processed yarn in which yarn groups having significantly different crimp characteristics are mixed, in a drawing treatment process without providing a drawing device having a pair of a yarn feeding part and a take-up part. It is a thing.

<Prior art> Conventionally, a yarn having a significantly different crimping property is obtained by subjecting a thermoplastic synthetic fiber to a specific heat treatment or false twisting process, which allows the fiber to be processed with a single processing weight. Various attempts have been made to produce a specially textured yarn in which groups are mixed.
For example, in Japanese Patent Application No. 59-98372, the inventors of the present invention previously disclosed that thermoplastic synthetic fiber different shrinkage in which filaments in which thermal stress is reversed under high relaxation rate and low relaxation rate or in a stretched state are mixed. The mixed fiber is subjected to relaxation heat treatment in advance at a relaxation rate in which the thermal stress of the low-shrinkage filament is lower than that of the high-shrinkage filament, and then the false twisting is performed under the relaxation rate or in the stretched state in which the thermal stress of both is reversed. We have proposed a method for producing special false twisted yarn by performing processing and then performing stretching processing so that the crimping rate of the high shrinkage filament is lower than the crimping rate of the low shrinkage filament.

<Problems to be Solved by the Invention> According to this method, although the yarns are processed by a single processing weight, different yarn groups are mixed in the width of the crimping property and the external force is applied. However, since this method requires a drawing treatment zone subsequent to the false twisting processing zone, a separate drawing and taking-up device must be provided after the take-up device for the false-twisting processing zone. However, there was a problem in that it was unavoidably large and the processing cost was unavoidable.

Moreover, in the so-called indrow method of drawing false twisting, in which the false twisting process and the drawing process are performed at the same time when the false twisting process is performed by using the undrawn yarn as the supply yarn, the false twisted twisted body normally winds the yarn around the spinner. In the case of a twisted body with a large ratio of untwisting tension to twisting tension, such as a spindle,
Since the ratio of the untwisting tension to the twisting tension is large, there are problems such as yarn breakage, yarn unevenness in the longitudinal direction of the yarn, and the occurrence of fluff in the yarn during processing. To prevent these problems, false twisting is performed. In order to perform the drawing process and the drawing process, it is necessary to complete the drawing process before the yarn passes through the feeding device and the spindle, and the false twisting process and the drawing process are performed in this order without problems such as yarn breakage, yarn unevenness and fuzz. It was difficult to apply all at once.

<Means for Solving Problems> The inventors of the present invention have performed relaxation relaxation heat treatment on thermoplastic synthetic fiber different shrinkage mixed yarns, and then false twisting with a usual false twisting spindle, and subsequently performing stretching treatment and crimping. In the manufacturing method of the processed yarn in which different yarn groups are mixed with each other with a large range of characteristics, as a result of diligent study to solve the above-mentioned problems, as a result, positive guides were used between the false twist spindle and the take-up device. By performing the drawing action, the yarn is drawn by the time it reaches the take-up device via the false-twisting spindle without providing a take-up device for drawing, and the false-twisting process and the drawing process are performed in the conventional false-twisting zone. The present invention has been accomplished by discovering that false twisting can be performed without causing problems such as yarn breakage, yarn unevenness, and fluff, as well as being performed simultaneously. Conventionally, a guide is provided between the false-twisted body and the take-up device in order to improve defects in the longitudinal direction of the yarn such as "constriction" of the false-twist textured yarn. The purpose of this is not to extend the yarn, but is essentially different from the present invention.

That is, according to the present invention, a thermoplastic synthetic fiber different shrinkage mixed filament yarn having a 10% drawing stress of 0.5 g / d or more is subjected to relaxation heat treatment, then false twisted with a false twisting twisted body, and then, when the drawing treatment is performed, false twisting is performed. A friction resistance body is provided between the twisted body and the take-up device, the tension between the friction resistance body and the take-up device is set to 1 g / d or more, and the yarn is stretched in the area. .

Hereinafter, the present invention will be described in more detail.

According to the method of the present invention, a thermoplastic synthetic fiber different shrinkage mixed yarn having a 10% stretching stress of 0.5 g / d or more is subjected to relaxation heat treatment, then false twisted with a false twisted twisted body, and subsequently stretched. Is. That is, in the method of the present invention, the 10% stretching stress is 0.
A yarn obtained by relaxing and heat-treating a thermoplastic synthetic fiber heterogeneous shrinkage mixed yarn of 5 g / d or more is supplied for false twisting. For example, the supplied yarn is once drawn and has a 10% drawing stress of 0.5 g / d. Since the yarn has been subjected to relaxation heat treatment again after being set to d or more,
Even with a yarn having a difference in yarn length due to a difference in heat shrinkage, the thickness, unevenness, and crimping unevenness in the longitudinal direction are significantly smaller than those of, for example, a yarn obtained by subjecting an undrawn yarn to direct relaxation heat treatment. There is no problem of yarn breakage or fluffing of the processed yarn even if false twisting is performed with the false twisting spindle, and crimping can be performed even if it is stable.

In addition, generally, when a yarn having a yarn length difference caused by relaxation heat treatment is false twisted so that the yarn length difference is preserved, a processed yarn having a wide range of crimp characteristics can be obtained. Since a filament group that is contracted and slackened becomes a low-contraction filament group and becomes unstable toward the outside, so that the low-contraction filament group becomes a high-contraction filament group, as shown in FIG. And a different shrinkage mixed filament yarn in which the thermal stress under the low relaxation rate or under the drawn state is reversed, the relaxation heat treatment is performed in advance under the relaxation rate in which the thermal stress of the low shrinkage filament is lower than that of the high shrinkage filament. After applying, false twisting is performed under the relaxation rate or the drawing state in which the thermal stresses of both are reversed, and further stretched so that the crimping rate of the high shrinkage filament is lower than that of the low shrinkage filament. Stable yarn is obtained against external forces.

In the method of the present invention, a friction resistor is provided between the false twisted twisting body and the take-up device, and the tension between the friction resistor and the take-up device is 1 g.
/ d or more, and the yarn is drawn in the area. Here, the frictional resistance means a device that applies tension to the running yarn, and specifically, a guide for bending the yarn path that can change the contact angle, a magnetic tensor that can be adjusted by magnetic force, and the like. In the case of a yarn path bending guide, any material and shape may be used as long as it can apply a tension of 1 g / d or more to the yarn, but the radius of curvature of the guide that contacts the yarn is extremely high. Since the thread is easily damaged if the angle is small and the bending angle is acute, the guide shape is
The guide is a round bar as shown in the figure, and its diameter is preferably 10 times or more the thread diameter. In addition, a plurality of bends may be provided at symmetrical positions with respect to the yarn path so that the bending angle of the yarn path does not become more acute than 15 ° and the yarn hooking operation is facilitated.

The tension of the yarn between the friction resistor and the take-up device needs to be 1 g / d or more. If the tension is less than 1 g / d, the stretching treatment is not sufficiently performed and the desired yarn cannot be obtained, which is not preferable. . Further, if the tension is too high, for example, in the case of spun-drawn yarn, it may exceed the drawing tension during spinning-drawing, and there is a concern that yarn unevenness in the longitudinal direction and processed yarn fluff may occur, so it is preferably 2 g / d or less.

As described above, after the relaxation heat treatment, the false twisting process is performed, and the yarn is stretched between the false twisting body and the take-up device, and as described above, the yarn is stable against external force, and the crimping property is largely different. It is possible to manufacture a processed yarn in which mixed filaments are mixed. In addition, the yarn used for false twisting has a sufficient stretching stress of 10% stretching stress of 0.5 g / d or more due to the stretching during spinning-drawing. It is possible to carry out a stable drawing process without problems such as processing unevenness, crimp unevenness, yarn breakage, and fluffing of the processed yarn.

FIG. 1 is a process schematic view showing an example of the processing method of the present invention. The thermoplastic synthetic fiber different shrinkage mixed filament yarn (Y) obtained by spinning-drawing passes through the feed roller (1) and then the feed roller (1 ) And the first delivery roller (3) are subjected to relaxation heat treatment by the heater (2), and are heat-fixed by the heater (4) while being twisted by the false twist spindle (5) through the first delivery roller (3). Twisting spindle (5)
The second delivery roller (5) is stretched by the yarn path bending guide (6) so that the tension of the yarn between the false twist spindle (5) and the second delivery roller (7) becomes 1 g / d or more. After 7), it is wound on the package (9) by the winding roller (8).

As the false-twisted twisted body in the present invention, any twisted body may be used as long as the yarn can be drawn between the twisted body and the take-up device. Can be mentioned.

In the present invention, the thermoplastic synthetic fiber having a 10% stretching stress of 0.5 g / d or more is, for example, polyester fiber, a spinning speed of 1000
After spinning at a speed of less than m / min, draw 3-4 times or spin at 3000m
/ min or more, it can be obtained directly without stretching. Further, the heterogeneous shrinkage mixed yarn in the present invention may be of any type such as polyester and polyamide, but a polyester multifilament yarn is preferred because an effective heterogeneous shrinkage mixed yarn can be obtained by spinning-drawing. .

<Examples> Hereinafter, the present invention will be specifically described with reference to Examples. Polyethylene terephthalate was spun using the same spinneret,
According to the process shown in Fig. 1, the polyester different shrinkage mixed yarn 75d / 48f showing the thermal stress characteristics is shown in Fig. 3 in which half of all filaments are relaxed under the processing conditions shown in Table 1 by the heat treatment during drawing. Heat treatment-false twisting was performed to produce a specially textured yarn according to the method of the present invention.

The obtained textured yarn was as if it had two yarns, one of which was a raw yarn and the other of which was a false twisted textured yarn. Even when squeezing this processed yarn to a tension of 30 g and squeezing it, no deviation phenomenon was observed, a load of 80 g was applied for 1 second, and the expansion and contraction rate (JIS L 1090) before and after that was measured. It was almost unchanged at 20.5% and 20.0%.

<Effect of the Invention> As described above, according to the method of the present invention, the 10% stretching stress is 0.5 g / d.
After the relaxation and heat treatment of the thermoplastic synthetic fiber heterogeneous shrinkage mixed yarn as described above, a friction resistor is provided between the false twisted twisting body and the take-up device, and the yarn is stretched by applying a tension of 1 g / d or more. Therefore, although processed with a single processing weight, it is possible to manufacture a processed yarn in which different filaments are mixed in a wide range of crimp characteristics.

In addition, the yarn used for false twisting has a sufficient stretching stress of 10% stretching stress of 0.5 g / d or more due to the stretching during spinning-drawing. It is possible to carry out stable operation without problems such as unevenness, crimp unevenness, yarn breakage, and fluffing of processed yarn.

Further, in the method of the present invention, a frictional resistance body is provided between the false twisted body and the take-up device to carry out the drawing treatment. Therefore, as in the conventional processing method, the yarn supplying section and the take-up section are paired. There is an advantage that a stretching device is not required and the device is simplified and the processing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a process schematic view showing an example of the processing method of the present invention, FIG. 2 is a view showing an example of a friction resistor used in the processing method of the present invention, and FIG. 3 is a thermoplastic synthetic fiber different shrinkage mixed yarn 3 is a graph showing the relationship between the relaxation rate and thermal stress at 200 ° C. of the high shrinkage filaments and low shrinkage filaments. (1) …… Feed roller, (2) …… Heater, (3)
...... First delivery roller, (4) …… Heater, (5)…
… False twist spindle, (6) …… Guide for yarn path bending,
(7) ... second delivery roller, (8) ... winding roller, (9) ... package, (Y) ... different shrinkage mixed fiber.

Claims (3)

[Claims] 1. A thermoplastic synthetic fiber different shrinkage mixed yarn having a 10% stretching stress of 0.5 g / d or more is subjected to relaxation heat treatment, then false twisted with a false twisted twisting body, and then subjected to a temporary stretching treatment. A false twist characterized in that a friction resistance is provided between the twisted twisted body and the take-up device, the tension between the friction resistance and the take-up device is set to 1 g / d or more, and the yarn is drawn in the area. Processing method. 2. The false twisting method according to claim 1, wherein the friction resistor is a guide for bending a yarn path. 3. A different-shrinkage mixed filament yarn is a mixture of filaments having a high relaxation rate and a thermal stress which is reversed at a low relaxation rate or in a stretched state, and the thermal stress of the low-shrinkage filament is a high-shrinkage filament. After pre-relaxation heat treatment with a lower relaxation rate than that of the above, the false twisting process is performed under the relaxation rate in which the thermal stress reverses or in the stretched state so that the crimp rate of the high shrink filament becomes lower than that of the low shrink filament. The false twisting method according to claim 1 or 2, wherein the drawing treatment is performed on the sheet.