JPH0860465A - Stretching false twisting device - Google Patents

Abstract

(57) [Summary] [Purpose] The drawing point position of the yarn does not become unstable due to heating unevenness of the yarn, false twisting torque and vibration of the yarn, and it is possible to obtain a high-quality processed yarn with less uneven dyeing. An apparatus for performing draw false twisting is provided. [Constitution] A heating means (3) for heating the traveling yarn (Y),
In a yarn drawing and false twisting device, which comprises a false twisting device (5) arranged downstream of the heating device and twists the yarn, and which draws and false twists the yarn, propagation of twist by the false twisting device A twist stopping means (11) for stopping the heating is provided inside the heating means,
A guide (34) is arranged downstream of the twisting means, the yarn is bent between the twisting means and the guide, and a friction difference between the guides causes a tension difference between the upstream side and the downstream side of the guide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draw false twisting device for synthetic fiber yarns such as polyester and polyamide.

[0002]

2. Description of the Related Art Conventionally, the yarn is false-twisted or drawn false-twisted by not contacting the yarn in the heating body of the yarn or partially contacting the regulating guide of the yarn arranged in the heating body. It was

[0003]

However, in recent years, the drawing false twisting device has been increasing the yarn processing speed and increasing the number of filaments in the yarn. Therefore, in the above-mentioned conventional technique, since the twisting guide for the yarn is arranged upstream of the heating means, the twist imparted by the false twist means is twisted along the yarn from the inside of the heater to the twist at the heater inlet. Since the number of filaments in the yarn is not uniformly heated in a short time, false twisting torque, vibration of the yarn, etc., the position of the yarn stretching point becomes unstable, There was a problem that spots were generated on the surface.

[0004]

It is an object of the present invention to obtain a high-quality processed yarn with less uneven dyeing, because the drawing point position of the yarn does not become unstable due to uneven heating of the yarn, false twisting torque and vibration of the yarn. It is an object of the present invention to provide a device for drawing false twisting.

[0005]

SUMMARY OF THE INVENTION In the present invention, a heating means for heating a running yarn and a false twisting means arranged downstream of the heating means for twisting the yarn are provided. In the drawing false twisting device of the yarn, a twist stopping means for stopping the propagation of twist by the false twisting means is disposed inside the heating means, and a guide is disposed downstream of the twisting means. The above object is achieved by a draw false twisting device in which a yarn is bent between the twist stopping means and the guide, and a friction difference of the guide causes a difference in tension between the upstream and the downstream of the guide.

[0006]

According to the present invention, the yarn twisting stopping means is arranged in the heating means, and the resistor is arranged downstream of the twisting stopping means. The yarn is heated uniformly in the filament state in the untwisted portion, and then the tension applied to the yarn by the resistor in the downstream portion of the twisting means is determined according to the temperature of the yarn at that position. The yarn is stretched and false twisted at a tension not lower than the stretching tension of the yarn.

Therefore, even if the yarn shakes due to uneven heating of the yarn, vibration of the yarn, etc., the position of the drawing point can be made stable, and the tension of the yarn downstream of the resistor is reduced. Since it can be increased, the speed at which surging occurs is improved, so that it is possible to improve the yarn quality of the processed yarn at high speed.

[0008]

The present invention will be described in detail below with reference to the accompanying drawings showing the embodiments of the present invention. FIG. 1 is a sectional view of a drawing false twisting apparatus of the present invention, FIG. 2 is a sectional view of heating means, FIG. 3 is a sectional view taken along arrow A, and FIG.

In FIG. 1, a yarn Y (a semi-stretched yarn (POY) or an unstretched yarn (UDY) of a synthetic fiber yarn such as polyester, polyamide, etc., drawn from a supply yarn original yarn 1 by a pair of drawing rollers 2a, 2b. Is stretched between the supply roller 30 including a pair of nip rollers and the feed roller 6 including a pair of nip rollers.

Between the supply roller 30 and the feed roller 6,
The heating device 3 bent in an L shape, and the stabilizing racks 4a, 4a arranged in a dogleg shape on the downstream side of the heating device 3.
A false twisting device 5 for twisting b and the yarn Y is provided. The stabilizing racks 4a and 4b cool the yarn Y heated by the heating device 3.

The false twisting device 5 is a known spindle type,
Multi-axis multi-plate type and others can be used. The twist imparted by the false twisting device 5 goes back upstream along the yarn Y and is heated in the heating device 3 to fix the twist.

A second heater 31 is appropriately provided on the downstream side of the feed roller 6, and if necessary, the second heater 31 is not provided.

After passing through the feed rollers 9 and 10, the yarn Y is wound up as a package 8 by a winding device including a friction roller 7 and a cradle.

The structure of the heating device 3 will be described with reference to FIG. The illustrated heating device 3 is bent in an L-shape as shown in FIGS. 1 and 2, and a case 12 of the heating device surrounding each of the bent parts, and the sheath heaters 15 and 18 provided in the case 12 are provided. The heating plates 17 and 20 of the heating means are respectively heated by
Grooves 16a and 19 for thread running are formed in the center of the surfaces of 7 and 20.
A large number of yarn regulation guides 16 and 19 having a are provided. A heating body may be used instead of the sheath heaters 15 and 18.

A twisting roller 11 is rotatably provided as the twisting means of the present invention in the middle of the two heating device portions bent in the L-shape formed as described above.

The anti-twisting roller 11 is provided on the supporter 26 so as to be movable between the normal processing position indicated by the solid line and the yarn hooking position indicated by the broken line in the plane of FIG.

As a result, the heating device 3 is provided with the twist-preventing roller 1
It is separated into two parts 13, 14 upstream and downstream of one. In FIG. 2, reference numeral 21 indicates a heat insulating material of the heating device 3.

The details of the twisting roller 11 are shown in FIG. The shaft 23 is fastened to the supporter 26 by a nut 27. The shaft 23 has a large number of grooves 2 in a V shape.
3a is formed on the peripheral surface thereof, and the twisting roller main body 22 is attached to the portion where the groove is formed. In this way, the twisting roller 11 constitutes a dynamic pressure air bearing between the shaft 23 and the twisting roller body 22.

The flanges 24 and 25 are provided with thrust grooves on the side surface of the anti-twist roller, are fitted into the shaft 23, and form thrust air bearings by the thrust grooves (not shown). 11 to prevent axial movement.

On the surface of the anti-twisting roller body 22, a large number of blade members 22a, which are well known in the ordinary anti-twisting roller, are alternately formed.

In this embodiment having the above-mentioned structure, the yarn Y drawn from the supply raw yarn 1 is stretched between the supply roller 30 and the feed roller 6. In this case, it is heated by the heating means 3 and drawn by the speed difference between the supply roller 30 and the feed roller 6 and the twisted yarn.

FIG. 5 shows the heating means 13 having a length of 0.3 m and a temperature of 550 ° C., the heating means 13 having a length of 0.7 m and a temperature of 290 ° C.
The temperature of the yarn Y passing through the inside of the heating means 3 in a state where the POY 125de / 36f of polyester is stretched at a stretch ratio of 1.66 by setting to a value of 75 and a processed yarn of 75de is obtained.

FIG. 6 shows the tension of the yarn Y passing through the inside of the heating device in the state shown in FIG. L ₁ represents the drawing tension of the yarn Y corresponding to the temperature of the yarn Y passing through the inside of the heating device. L ₂ represents the tension of the yarn, point A is the disposition point of the twisting roller 11, point B is the guide pin 34.
Indicates the arrangement point of.

A twisting prevention roller 11 is provided inside the heater 3, and the twist imparted by the false twisting means 5 reaches back to the twisting prevention roller 11.

In this heating device 3, the yarn Y is heated to a temperature near the glass transition point by the time it reaches the twisting roller 11 shown by point A in FIG. In that state, resistance is applied to the yarn Y by the guide pin 34 (point B in FIG. 6). As a result, the tension L ₂ of the yarn downstream of the guide pin 34 becomes equal to or higher than the drawing tension L _{1 of the} yarn Y determined according to the temperature of the yarn Y, and the yarn Y is drawn. Therefore, the yarn Y can be reliably and stably stretched. The tension L ₂ of the yarn Y upstream of the guide pin 34 is set to a value lower than the drawing tension L _{1 of the} yarn Y determined according to the temperature of the yarn Y upstream of the guide pin 34.

As another embodiment, as shown in FIG. 7, the heating means downstream from the twisting roller 11 is divided into 14A and 14B, and the upstream side 14A of the two divisions is heated to a temperature higher than the melting point of the yarn. By setting the downstream side 14B lower than the melting point, it is possible to improve the passage rate of the knot (knot) of the yarn and to prevent the yarn from being fused in the heating means when the yarn is cut. It may be prevented.

[0027]

According to the present invention, the twisting means for the yarn is arranged in the heating means, the yarn is heated in a state where no twist is applied, and the resistor is arranged downstream of the twisting means. However, it is set to be equal to or lower than the drawing tension of the yarn corresponding to the temperature of the yarn passing through the heating means upstream of the resistor and equal to or higher than the drawing tension of the yarn corresponding to the temperature of the yarn downstream of the resistor. As a result, stretched false twisting is performed. Therefore, even if the yarn sways due to a slight change in the air flow in the vicinity of the heating body, uneven twisting torque of the yarn, or vibration of the yarn, the position of the drawing point of the yarn can be made stable. . Further, the tension of the yarn upstream of the resistor can be increased, the surging speed can be increased, and the yarn quality of the processed yarn can be improved at high speed. Further, the yarn can be heated in a single yarn state before being twisted, and a high quality processed yarn can be obtained even in a yarn having a large number of filaments.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a drawing false twisting device of the present invention.

FIG. 2 is a cross-sectional view of heating means.

FIG. 3 is a view on arrow A.

FIG. 4 is a sectional view of a twisting roller.

FIG. 5 is a diagram showing the temperature of the yarn passing through the inside of the heating device.

FIG. 6 is a diagram showing the tension of a yarn passing through the inside of a heating device.

FIG. 7 is a diagram showing another embodiment.

[Explanation of symbols]

 Y traveling yarn 3 heating means 5 false twisting means 11 twist stopping means 34 guide

Claims (1)

[Claims] 1. A heating means for heating the running yarn, and a false twisting means arranged downstream of the heating means for twisting the yarn,
In a yarn drawing and false twisting device for drawing and false twisting a yarn, a twist stopping means for stopping the propagation of twist by the false twisting means is provided inside the heating means, and is provided downstream of the twisting means. A guide is disposed in the yarn, and the yarn is bent between the twist stopping means and the guide so that a tension difference is generated between upstream and downstream of the guide due to friction of the guide. Stretching false twisting device.