JPH0835136A - Cooler of false-twisting machine - Google Patents

Abstract

PURPOSE:To provide a cooler for an ultra-high speed false twisting machine, capable of preventing surging and excellent in cooling efficiency. CONSTITUTION:This cooler of a false twister involves cooling units 2 and 2' separated in the traveling direction of a filament yarn (Y) and a thread presser 3 set at the intermediate position of the separated cooling units. The thread presser has a cooling liquid discharge nozzle (3a) for filament yarn at the top part and a cooling air suction member is attached at least to one cooling unit on the downstream side of the thread presser.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a cooling device for a false twisting machine such as a drawing false twisting machine and a false twisting machine.
The so-called surging phenomenon at the time of high-speed false twisting while increasing the cooling efficiency, that is, when the false twisting speed is remarkably increased, the yarn causes valleying (rolling) in the twisting zone and the tension of the twisted yarn is abnormal. The present invention relates to a cooling device for a false twisting machine that suppresses a phenomenon in which fluctuation occurs.

[0002]

2. Description of the Related Art A false twisting machine comprises a false twisting device for twisting a yarn and a heating device installed upstream of the false twisting device for fixing the twist that is applied by the false twisting device and goes back along the yarn. ing. Further, the draw false twisting device is provided with a draw device for drawing the yarn at a predetermined draw ratio at the same time as or before the fixation of the twist by the heating device and the false twist device.

Conventionally, when the false twisting speed is up to several hundred m / min, it is sufficient to naturally cool the yarn immediately after twist setting by the heating device, and no special cooling device is required.

However, as the false twisting speed becomes higher, the yarn is not sufficiently cooled only by the conventional natural cooling, and ballooning in the cooling section increases due to the twisted yarn traveling at a high speed. Therefore, the yarn is brought into contact with the cooling device to travel and cool, and ballooning is suppressed.

[0005]

When the false twisting speed is further increased to an ultra high speed (1,000 m / min or more), the cooling capacity of the processed thread is insufficient and it becomes difficult to obtain a desired thread quality. There is. In addition, it has been attempted to lengthen the cooling device in order to secure the cooling capacity. However, when the cooling device is lengthened, the yarn is surging (vibration of large waves) on the cooling device, that is, the yarn is twisted in the twisting zone. There is a problem that a phenomenon that abnormal tension occurs in the tension of twisted yarn due to ballooning (rolling), causes a decrease in the surging limit speed, and inevitably lowers the processing speed.
Particularly, in a high-temperature heating device that heats at a temperature of 300 ° C. or higher, dyeing spots and yarn breakage are likely to occur due to the surging phenomenon.

As a method of solving this surging phenomenon, it is conceivable to increase the tension of the false twist portion. However, in this method, the crimping property is reduced, the yarn breakage is increased, and the like, and the method of increasing the tension of the false twist portion has a limit as a measure for preventing the surging phenomenon.

Therefore, in order to simultaneously overcome the contradictory technical problem of increasing the cooling capacity and also increasing the surging limit speed, the present invention has been achieved as a result of intensive studies.

The present invention provides a method for preventing the surging phenomenon,
The cooling device is shortened and the structure of the cooling device is improved to enhance the cooling capacity.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to suppress the above-mentioned surging phenomenon and to achieve an ultrahigh speed (1,0) with good cooling efficiency.
It is an object of the present invention to provide a cooling device for a false twisting machine, which is suitable for 00 m / min or more, particularly 1,400 m / min or more).

[0010]

SUMMARY OF THE INVENTION The present invention is a cooling device for a false twisting machine for synthetic fiber yarns, wherein the cooling device is divided in the yarn running direction, and a yarn retainer is provided in the middle portion of the divided cooling device. The above-mentioned object is achieved by a cooling device for a synthetic fiber yarn, characterized in that at least a cooling device downstream of the yarn retainer is provided with a blowing or suction member for cooling air.

The yarn retainer of the present invention preferably has a yarn cooling liquid discharge nozzle at its tip.

[0012]

In the present invention, the cooling device is divided in the running direction of the yarn, and the yarn presser is provided at the intermediate portion of the divided cooling device. When the yarn comes into contact with the yarn presser, the yarn presser vibrates. It acts as a node of (ballooning) and the resonance frequency of the yarn in the cooling region is increased, so that surging hardly occurs.

The false twisted yarn can be convectively cooled by the contact between the false twisted yarn and the cooling device and the cooling air provided in the cooling device downstream of the yarn presser or the cooling air by the suction member.

Further, when a cooling liquid discharge nozzle is provided at the tip of the yarn presser and the cooling liquid is discharged from the discharge nozzle, the false twisted yarn is blown by the blowing of cooling air of the cooling device downstream of the yarn presser or the cooling air by the suction member. The false-twisted yarn can be cooled by the latent heat of the cooling liquid applied to the false twisted yarn.

[0015]

The present invention will be described in more detail below with reference to the drawings showing the embodiments of the present invention. FIG. 1 is a side view showing an outline of a high-speed false twisting device, in which a yarn Y unwound from a raw yarn package P is fed by a first feed roller 4, and a heating device 1, a cooling device 2, 2 ′, It is wound from the false twisting device 7 through the second feed roller 5 to a winding device 8 having a traverse device 6.

The false twisting device 7 twists the yarn Y, and the false twisting device 7
The twist imparted by (1) is traced back to the heating device 1 along the yarn Y, and the twist is thermally fixed by the heating device 1 and the cooling devices 2, 2 '. The heat fixing is the yarn Y heated by the heating device 1.
Is cooled by the cooling device 2, 2 '.

FIG. 2 shows the cooling device 2 of the present invention shown in FIG.
It is an expanded side view which shows the structure of 2 '. In FIG. 2, a plurality of partial cooling devices 2, 2 ', each of which has a yarn contacting surface 2a, 2'a having an arcuate shape with a predetermined radius of curvature R, are placed at a small interval from each other, and as a whole, the above described It is arranged along an arc having a predetermined radius of curvature R.

As described above, the partial cooling devices 2 and 2'and the plurality of partial cooling devices 2 and 2'have an arc shape as a whole. 2'and the contact with the entire cooling device are improved to improve the cooling effect and to maintain an appropriate yarn tension.

The material of each of the partial cooling devices 2 and 2'is capable of rapidly cooling the yarn Y, is less likely to be worn, has a low coefficient of friction with the fiber, and is cheap in price. Can be used.

Between each of the partial cooling devices 2 and 2 ', the yarn presser 3 is adjacent to the yarn contacting surface 2a of the partial cooling device 2 or 2'.
It is located below the yarn contact surface 2a, 2a 'of the partial cooling device 2 beyond the imaginary line connecting the 2a'. The longitudinal ends of the partial cooling devices 2 and 2'are chamfered so that the yarn Y is not damaged by the edges.

At least the partial cooling device 2'provided on the downstream side of the thread presser is provided with a blowing or suction member for cooling air.

The structure of the cooling air suction member will be described with reference to FIG. FIG. 5 is a view taken in a cross section orthogonal to the running yarn of the partial cooling device 2'on the downstream side. The partial cooling device 2'is a yarn-contacting surface 2'having a circular arc-shaped cross-section along which the yarns run in contact.
a and a pair of side surfaces 2'b connected at an angle to the yarn contact surface 2'a.

In this embodiment, there is no opening in the yarn contact surface 2'a, and a large number of openings 2'c are arranged in parallel in the running direction of the yarn Y on the side wall surface 2'b which the yarn Y does not contact. It is provided. The opening 2'c can have any suitable shape, but it is preferable that the opening 2'c has a circular shape in order to facilitate manufacture.

The tip of the side wall 2'b opposite to the yarn contacting surface 2'a is bent outward to form a chamber 2'd surrounding the outside of the side wall 2'b as a whole. A suction port to the suction means is formed in the formed chamber 2'd. In addition,
In the above-mentioned embodiment, the opening is not formed on the yarn contacting surface 2'a, but in some cases, the opening is formed on the yarn contacting surface 2'a with a size that does not hinder the running of the twisted yarn Y. May be. Considering the accumulation of scum caused by babies such as oil applied to the yarn and damage to the yarn Y, it is preferable to provide the opening on the side wall rather than the yarn contact surface.

Referring again to FIG. 2, each partial cooling device 2,
2'communicates with the cooling air exhaust blower 9. Therefore, in this embodiment, the yarn Y heated by the twist set heater 1 is cooled by conduction from the cooling device while coming into contact with the partial cooling devices 2, 2 ', and is forcibly discharged from the cooling air exhaust blower 9. It is cooled by convection of cooling air. At the same time, the yarn Y is pressed by the yarn presser 3 between the two partial cooling devices 2 ', so that the occurrence of ballooning is largely prevented. Therefore, the critical speed at which surging occurs is increased.

Another embodiment will be described with reference to FIG. This embodiment is different from the above-described first embodiment in the following points. That is, the yarn retainer 3 is provided with a cooling liquid discharge nozzle for the yarn Y at the tip thereof. An example of an embodiment of the thread retainer 3 is shown in FIG. In this embodiment, a passage (nozzle) 3a for supplying a cooling liquid is formed in a central shaft portion inside a thread retainer 3 having a U-shaped cross section, and an end portion thereof is provided with a cooling liquid delivery pump 10 (Fig. It communicates with 3). As a result, the cooling liquid supplied from the cooling liquid feed pump 10 exudes to the peripheral surface of the thread presser 3 through the passage (nozzle) 3a, and the thread presser 3
Is pressed against the yarn Y and this cooling liquid is applied to the yarn.

In this embodiment, a cooling liquid is supplied from the yarn presser 3, and the cooling liquid is attached to the false twist yarn Y. The attached cooling liquid is sucked by the cooling air sucked from the partial cooling device 2'provided in the false twisting device, so that the cooling liquid is evaporated and sucked. At this time, the cooling liquid removes a large amount of heat from the yarn Y by latent heat, and can cool the yarn Y extremely effectively.
As the cooling liquid, it is preferable to use a volatile substance such as alcohol or ether in order to efficiently perform cooling by the latent heat of cooling. In some cases, water may be used as the cooling liquid.

In the above description, the cooling air suction member is provided in the cooling device downstream of the thread presser, but a cooling air blowing member may be provided in the cooling device downstream of the thread presser.

If the volatile substances such as alcohol and ether as the cooling liquid are discarded as they are as described above, the operating cost becomes very expensive and environmental problems may occur. In the example, the volatile substances are separated and collected from the cooling air and then recycled and reused. That is, in FIG. 4, the partial cooling device 2,
2'is connected to the condenser 11 of the recovery device,
The cooling liquid separated by the condenser 11 is supplied to the cooling liquid delivery pump 10 again. A known structure may be used as the cooling liquid recovery device, and a detailed description of the structure will be omitted. The other structure is similar to that of the embodiment shown in FIG.

[0030]

According to the present invention, the cooling device is divided in the yarn traveling direction, and the yarn presser is provided at the intermediate portion of the divided cooling device, and the yarn is brought into contact with the yarn presser.
The yarn retainer acts as a node of vibration (ballooning), and the resonance frequency of the yarn Y in the cooling region is increased, so that surging hardly occurs.

When the cooling liquid discharge nozzle is provided at the tip of the thread presser and the cooling liquid is discharged from the discharge nozzle, the cooling liquid is blown out by the cooling air of the cooling device downstream of the thread presser or the cooling air by the suction member. The yarn Y can be cooled by the latent heat of.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a high-speed false twist device.

FIG. 2 is a side view showing the configuration of the cooling device of the present invention shown in FIG.

FIG. 3 is a side view of another embodiment.

FIG. 4 is a side view of yet another embodiment.

FIG. 5 is an enlarged sectional view of the partial cooling device.

FIG. 6 is an enlarged perspective view of the thread retainer.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Heating device 2 Cooling device 2'Cooling device 3 Thread retainer 7 False twisting device 8 Winding device P Original yarn package Y Yarn

Claims (5)

[Claims] 1. A cooling device for a false twisting machine, wherein the cooling device is divided in a yarn traveling direction, and a yarn presser is provided at an intermediate portion of the divided cooling device. A cooling device for a false twisting machine, wherein the cooling device is provided with a member for blowing or sucking cooling air. 2. A cooling device for a false twisting machine, wherein the cooling device is divided in a yarn traveling direction, and a thread retainer is provided at an intermediate portion of the divided cooling device, and the yarn retainer is provided at a tip portion thereof. A cooling device for a false twisting machine, which has a strip-shaped cooling liquid discharge nozzle, and is provided with a blowing or sucking member for cooling air at least in a cooling device downstream of the yarn retainer. 3. The false twisting machine according to claim 2, wherein a volatile substance such as alcohol and ether is used as a cooling liquid, and volatile quenching is performed by cooling air downstream thereof. Cooling system. 4. The cooling device for a false twisting machine according to claim 3, further comprising a device for separating and recovering a volatile substance from the cooling air and circulating and reusing it. 5. The cooling device according to claim 1, wherein the yarn contacting surface of each divided part of the cooling device has an arc shape, and each part having the arc shape. Is arranged along an arc, and a cooling device for a false twisting machine.