JPS60126331A - Yarn cooling in false twister - Google Patents

Abstract

PURPOSE:A yarn cooling plate is set between the twist-setting heater and the false twister in the false-twisting machine to blow the air to the yarn running between them to enable high-quality yarns to be produced, even when the twisting speed is increased. CONSTITUTION:A yarn-cooling plate 5 is set on the yarn-running path between the twist-setting heater 2 and the false twister 6 in the false twisting machine. The cooling plate 5 is connected through pipe 7 to the air cooler 18 and the fan 19 and the fan feeds the air, which is cooled in the air cooler 18 and sent to the plate 5. The yarn-cooling plate 5 is formed in a hollow pipe which has a U- shaped groove for passing the yarn on the lower surface and openings on both ends 21. A plurality of small holes 22 are opened in a series on the bottom surface of the yarn-passing grooves from which a part of cooling air is blown out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn cooling device for setting the yarn to a temperature suitable for the processing in a false twisting machine used when bulking multifilament yarn.

The multifilament yarn (hereinafter referred to as yarn) pulled out from the yarn supply package is passed through a heater and then guided to a false twisting device such as a belt type or friction type, and the twist formed on the yarn by the false twisting device is In a false twisting machine that is fixed within a heater, controlling the temperature of the heater and the temperature of the yarn at the time it is introduced into the false twisting machine are important processing requirements.

In other words, if the yarn heated to the softening point by the heater is introduced into the false twisting device while still at high temperature, the twist formed on the yarn will not propagate effectively into the heater, and the yarn composition will be destroyed, causing the yarn to deteriorate. It may even lead to amputation.

Therefore, it is preferable that the yarn leaving the heater run in the air for a while to cool down to an appropriate temperature before being introduced into the false twisting device. It is also common practice to arrange a metal plate for cooling the yarn and allow the yarn to travel within the plate.

However, in order to perform high-speed processing of yarn, it is necessary to lengthen the space between the heater and the false twisting device, that is, the yarn cooling zone.
Accordingly, installation of the false twisting machine requires a larger space and the workability becomes worse.

The present invention aims to solve these problems and provides a method that enables effective cooling of threads.

The invention proposes to actively cool the yarn by applying an air flow to the running yarn in a yarn cooling zone between the heater and the false twisting device. The above-mentioned air flow is one that sprays air at a predetermined temperature and pressure in the same direction, in the opposite direction, or in a direction perpendicular to the running direction of the yarn, and by changing the temperature, pressure, and injection method, the yarn can be brought to the desired temperature. Can be cooled.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the entire false twisting machine according to the present invention, in which the yarn (Y) pulled out from the yarn supply package (Pl) passes through the 17th and 17th rollers (1) and into the first heater (2). The yarn passes upward, is bent by the guide pins (3) and (4), runs to the left inside the yarn cooling plate (5), and is introduced into the false twist bag @ (6). The false twist bag @ ( The thread (Y) coming out of 6) is attached to the guide pin (
7) is bent downward, passes through the second feed roller (8), descends inside the second heater (9), and then passes through the guide pin (10).
, third feed roller (11), guide pin < 1
2) Pass through (13) and (14) in order and then remove the friction roller (
15) onto a winding package (P2) which is rotationally driven. In this false twisting device, the above-mentioned devices for processing the yarn (Y) are arranged along the travel path of the yarn (Y).

The twist formed on the yarn (Y) in the false twisting bag @ (6) propagates to the first feed roller (1) via the yarn cooling plate (5) and the first heater (2), The twist is fixed within the strand. The yarn (Y) exits the false twisting device (6) and is untwisted, and its residual torque is eliminated by a second heater (9) provided as the case may be, resulting in a bulky textured yarn. The false twisting device (6) is a belt-type device that performs false twisting by nipping the yarn between two intersecting endless belts running in different directions, or a belt-type device that performs false twisting by nipping the yarn between two intersecting endless belts running in different directions, or a device in which the yarn is brought into contact with the outer periphery of a plurality of rotating disks. A known method such as a friction type method that performs false twisting by twisting can be used.

An air cooling bag @ (18) and a fan (19) are connected to the yarn cooling plate (5) via a pipe (17).
The air supplied by the fan (19) is air-cooled by the air cooling device (]8
) to a predetermined temperature, the pipe (17)
through which the yarn is fed to the yarn cooling plate (5). The structure of the yarn cooling plate 1-(5) is shown in FIG. 2, and the plate (5) is a hollow plate having a U-shaped yarn passage groove (20) on the lower surface and openings (21) at both ends. It is a pipe-like object. In addition, the thread cooling plate (
5) A large number of small holes (22) communicating with the hollow part are formed in a line along the threading groove (20), and the pipe (17) is connected in communication with the hollow part. There is. thread(
Y) runs within the threading groove (20) linearly or with a slight bend to the extent that it is lightly pressed into contact with the bottom surface of the threading groove;
Vibration is suppressed by the bottom surface and both side walls of the threading groove (20), and the heat is effectively released by contacting the threading groove (20).

Furthermore, the cooling air supplied into the hollow part of the yarn cooling plate (5) cools the yarn cooling plate (5) heated by contact with the yarn (Y), and then cools the yarn cooling plate (5), which is heated by contact with the yarn (Y). 22), the running threads (
Y) is directly cooled.

According to an experiment using the above yarn cooling play 1-(5),
Assuming that a yarn (Y) consisting of a 150 tenier polyester filament is processed at a yarn speed of 750 m/min, and the maximum set temperature of the first heater (2) is 230 degrees, the false twisting device (6) Conventionally, in order to lower the yarn temperature to 80 degrees, the distance from the first heater outlet to the false twisting device was 2.5 degrees. '2 In was necessary, but 1.
It turns out that it can be shortened to 6m.

Openings (21) and small holes (22) of the yarn cooling plate (5)
Although the size and shape of the thread (Y) can be freely set, experiments have shown that the cooling effect on the thread (Y) is largely due to the airflow from the opening (21), and in some cases there are also threads without small holes (22). Confirmed to be usable. Alternatively, the air flow from the pipe (17) may be applied directly to the yarn (Y) without using the yarn cooling plate (5), or the pipe (17) and the yarn cooling plate (5) may be separate bodies. Good as a thing.

Cooling air flow is provided by a dedicated air cooling device (18) or fan (1).
It is economical to use the air flow for cooling or ventilation in the factory instead of using the cooling device (18).
) It is also possible to cool the yarn by blowing air only, but if the temperature and pressure of the air flow can be freely changed using the cooling device (18) and fan (19), it is possible to cool the yarn ( It is convenient because the yarn (Y) can be set at the optimum temperature according to the thickness, type, processing speed, and other processing conditions of the thread (Y).

As explained above, according to the present invention, the yarn coming out of the heater can be reliably cooled to a suitable temperature for false twisting the yarn. Further, due to the excellent cooling effect of the present invention, it is possible to shorten the yarn running section from the heater outlet I' to the false twisting device, thereby making it possible to downsize the entire false twisting machine and reduce its installation area.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the entire false twisting machine employing the present invention, and FIG. 2 is a perspective view of a yarn cooling plate viewed diagonally from below. (2) First heater (5) Yarn cooling plate (6) False twisting device (Pl) Yarn feeding package (Y) Yarn Fig. 1

Claims (1)

[Claims] In a false twisting machine, the yarn pulled out from the yarn supply package is passed through a heater and then introduced into a false twisting device, and the twist formed on the yarn by the false twisting device is fixed in the heater to obtain a bulky textured yarn. A method for cooling yarn in a false twisting machine, characterized in that the yarn traveling between the heater and the false twisting device is cooled by applying an air flow to the yarn.