JPH05311527A - Drawing and false-twisting process - Google Patents

Abstract

PURPOSE:To provide a drawing and false-twisting process effective in preventing the breakage of filament and decreasing the fluffs of a finished yarn. CONSTITUTION:The objective drawing and false-twisting process having a drawing stage divided from a false-twisting and heat-setting stage contains the 1st process to carry out the drawing of a yarn with a hot pin 10 optionally placed between the 1st upstream-side feed roller F0 and the 2nd upstream-side feed roller F1 and the 2nd process to carry out the false-twisting and heat-setting of the yarn with a heater H1 and a falsetwister 4 arranged in the order between the 2nd upstream-side feed roller F1 and a downstream-side feed roller F2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a POY from a spinning factory.
The present invention relates to a drawing false twisting method for drawing (Parcial Oriented Yarn) and performing false twisting and heat setting, and particularly relates to a processing method in which fluff is hardly generated.

[0002]

2. Description of the Related Art A conventional drawing false twisting method is a method in which a heater and a false twisting device are sequentially arranged between an upstream side feed roller and a downstream side feed roller to perform false twisting and heat setting simultaneously with stretching. .

Next, the arrangement of the drawing false twisting machine used in this conventional drawing false twisting method will be described with reference to FIG.
The yarn Y is pulled out from the yarn supply package P1 supported by the creel stand 1 and introduced into the heater H1 from the upstream feed roller F1. The yarn that has exited the heater H1 enters the belt type false twisting device 4 through the balloon control plate 2 that also serves as a yarn cooling device, and further passes through the downstream side feed roller F2 and is wound into the winding package P2 by the winder 5. The twist imparted by the false twisting device 4 tries to propagate to the upstream feed roller F1, and the twist is thermally fixed by the heater H1. Further, the downstream side feed roller F2 and the winding package P
A known sensor S for detecting the occurrence of yarn breakage is provided between the yarn feeding device 2 and the yarn feeding device 2, and it operates simultaneously with the yarn breakage by the sensor S between the yarn feeding package P1 and the upstream feed roller F1. A cutter C for cutting the warp yarn Y is provided. By the way, in the case of draw false twisting a fine article of 40 denier or less, in order to realize high-speed processing with less yarn breakage, the heater inlet 7 to the false twisting device 4 should be a linear yarn path with as little bending as possible. Preferably. Therefore, the heater H
1 is arranged at an angle of about 45 ° with respect to the frame 6, and a yarn path from the heater inlet 7 to the false twisting device 4 is a substantially linear yarn path. However, the heater inlet 7 and the upstream feed roller F1
And the twist of the false twisting device 4 propagates to the upstream side feed roller F1.
The actual number of twists in the inner part decreases. Therefore, a twist stopper roller 8 is provided near the heater inlet 7 to prevent the propagation of twist from the heater inlet 7 to the upstream feed roller F1.

The twisting roller 8 is, for example, 16
A single-sided disk with a large number of sloping sides radially like a sheet,
There is a structure in which the inclined sides face each other and are alternately stacked, and are integrally fixed with a bolt. A pair of wedges that are offset in the front-rear direction and intersect with each other are formed on the inclined sides that are alternately located. When the yarn Y is hung along the wedges, the yarns alternately engage with the inclined sides to form a zigzag shape. Rotation is blocked and twisting is stopped. At the time of threading, the twist preventing roller 8 can be lowered to the position a by the shift rod 30.

[0005]

As in the conventional method of drawing false-twisting, a heater and a false-twisting device are sequentially arranged between the upstream feed roller and the downstream feed roller, and the false-twisting / heating is performed simultaneously with the drawing. The method of fixing has a problem that filament breakage occurs especially in a thin yarn, and the number of fluffs in the processed yarn increases. In particular, when a yarn in which filaments having different properties such as elasticity are mixed, such as new synthetic fibers in recent years, is processed by using the above-mentioned draw false twisting machine, fluff becomes conspicuous.

The present invention has been made in view of the above problems of the prior art, and an object thereof is a drawn false twisting process capable of preventing filament breakage and reducing fluff of processed yarn. It is intended to provide a method.

[0007]

In order to achieve the above object, the method of drawing false twist of the present invention comprises a first step of drawing between a first upstream feed roller and a second upstream feed roller. And a second step in which a heater and a false twisting device are sequentially arranged between the second upstream feed roller and the downstream feed roller to perform false twisting and heat setting.
It is classified as heat setting.

[0008]

[Operation] The first step of stretching and the second step of false twisting and heat setting
By separating from the process, the state of being twisted while being strongly pulled is eliminated. When drawing, false twisting, and heat setting are performed simultaneously as in the conventional method, the yarn is twisted while being pulled strongly, and the difference in yarn tension before and after the false twisting device increases, leading to slip filament breakage in the device. It was found that even when using, when twisted while being strongly pulled, slipping filament breaks in the roller. If most of the drawing is performed first and then false twisting and heat setting are performed, filament breakage caused by slippage in the false twisting device or the twisting prevention roller is prevented, and the number of fluffs is reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a device configuration diagram of a drawing false twisting machine used in the method of the present invention.

According to the method of the present invention, a first step of arranging a heating means between the first upstream feed roller and the second upstream feed roller as necessary to perform stretching, and a second upstream feed roller. It includes a second step of arranging a heater and a false twisting device in order between the downstream side feed rollers to perform false twisting and heat setting. In the first step, half or more of the stretching is performed in advance and the second step is performed. Stretching in the step is less than half (less is preferable) so that the yarn is not strongly pulled by false twisting and heat setting in the second step.

Next, the equipment structure of the drawing false twisting machine used in the method of the present invention will be described with reference to FIG. In FIG. 1, a first upstream feed roller F0 is provided further upstream of the second upstream feed roller F1.
3 is different in that a hot pin 10 as a heating means is arranged between 0 and F1. Since other points are the same as those in FIG. 3, the same reference numerals are given and the description thereof will be omitted.

By setting the draw ratio of the feed rollers F0 and F1 to a predetermined value, the drawing in the first step can be separated from the false twisting / heat setting in the second step. If the draw ratio of the feed rollers F1 and F2 in the conventional method is 100%,
In the method of the present invention, the draw ratio of the feed rollers F0 and F1 is 5
It is 0% or more, and the closer it is to 100%, the less fluffing becomes. The hot pin 10 as a heating means is a heating medium vapor heating system and can be set at 160 to 250 ° C., which is lower than that of the heater H1. The yarn Y is wound around the hot pin 10 about once and heated. Stretching without the hot pin 10 is also possible, but in cold stretching, the molecular structure is disturbed and the strength is reduced by about 20%. Therefore, the hot pin 10 is disposed between the feed rollers F0 and F1 and stretched under heating. Has become. A double pipe type semi-conduct type may be used as a heating means instead of the hot pin 10. Further, in a yarn type in which the reduction in strength is not a problem, the hot pin 10 may be omitted and only the reduction of fluff can be achieved.

The feed rollers F0 and F1 have a draw ratio which takes into account the heat shrinkage of the yarn Y in the heater H1 and is usually negative. Therefore, the yarn Y is not strongly pulled by the false twisting and heat setting in the second step, and the false twisting device 4
Also, filament breakage due to slippage of the twisting prevention roller 8 is prevented, and the number of fluffs is reduced.

A new synthetic fiber of 160d (denier) / 100d / 144f (filament) was processed by the drawing false twisting machine explained in FIG. As processing conditions, 100% stretching was performed in the first step, false twisting and heat setting were performed in the second step, and the number of fluffs of the processed yarn was measured. As a result, the number of fluffs was reduced to 1/10 or less as compared with the case where drawing, false twisting and heat setting were performed simultaneously. Further, when the hot pin was used, the strength of the processed yarn was about the same as when the drawing, the false twisting and the heat fixing were simultaneously performed.

Although the drawing false twisting machine of FIG. 1 is a machine exclusively for fine articles, the method of the present invention can be applied to a general drawing false twisting machine as shown in FIG. The difference from that of FIG. 1 is that the heater H1 is erected substantially vertically, the balloon control plate 2 is disposed overhead, and the twisting prevention roller is not provided. Further, a second downstream feed roller F3 is provided further downstream of the first downstream feed roller F2, and the secondary heater H2 is provided between these feed rollers F2 and F3.
Is also different. The secondary heater H2 is used for setting the processed yarn, and is used according to the yarn type. Even in the drawing false twisting machine having such an arrangement, filament breakage occurs due to slippage in the belt type false twisting device 4. Therefore, the first downstream feed roller F0 and the hot pin 10 are provided to separate the drawing and false twisting / heat setting. Then there will be less fluff.

[0016]

The drawing false twisting method of the present invention is a method in which drawing and false twisting / heat setting are distinguished, and since the state of being twisted while being strongly pulled is eliminated, it is possible to use a false twisting device or a twisting prevention roller. Filament breakage due to the slippage of the filaments can be prevented, and fluff can be reduced. That is, it is a processing method suitable for stretch false twisting, which is a thin thread in which filaments having different properties such as elasticity are mixed, such as new synthetic fiber, and in which filament breakage is likely to occur.

[Brief description of drawings]

FIG. 1 is a device configuration diagram of a draw false twisting machine used in the method of the present invention.

FIG. 2 is a device configuration diagram of another drawing false twisting machine used in the method of the present invention.

FIG. 3 is a device configuration diagram of a drawing false twisting machine used in a conventional method.

[Explanation of symbols]

 F0 First upstream feed roller F1 Second upstream feed roller F2 Downstream feed roller 4 False twisting device H1 Heater

Claims (1)

[Claims] 1. A first step of stretching between a first upstream feed roller and a second upstream feed roller, and a heater and a false twisting device between the second upstream feed roller and the downstream feed roller. Secondly arranged in order to perform false twisting and heat setting
A drawing false twisting method comprising the steps of separating drawing and false twisting / heat setting.