JPS6344854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of threading into a heat treatment apparatus using a non-contact tubular heat treatment tube.

PRIOR ART Heat treatment of yarn is usually carried out by passing the yarn through a heating tube maintained at a predetermined high temperature. In order to cope with the recent increase in speed, for example, in the so-called direct spinning and drawing method, in which the spinning process and drawing process are made continuous for the purpose of improving productivity, high-temperature gas is flowed into the heat treatment tube and heat treatment is performed without contact. Heat treatment methods are being adopted.

In this type of heat treatment method, first of all, it is required to be able to heat-treat the yarn uniformly in the heat treatment tube, and in addition, to accommodate higher speeds, it is necessary to efficiently pass the thread through the heat treatment tube at the start and reduce loss time. There is a need to increase productivity.

Various methods of threading the heat-treated tube have been proposed in the past, but none of them have been satisfactory from the viewpoint of improving productivity.

For example, in the method shown in Japanese Patent Publication No. 48-8896, it is possible to thread the yarn while it is running at high speed, but a device that supplies compressed hot air for threading is constantly built into the heat treatment tube. Because of this, it is not possible to reduce the temperature of the device or the tube wall of the heat treatment tube to a low temperature in a short period of time, which causes troubles such as the thread being fused to the hot tube wall and making threading difficult. Something happened.

Furthermore, as shown in FIG. 1, for example, in the method of absorbing the thread 2 from the outlet of the heat treatment tube 1 with the suction gun 3, if the heat treatment temperature is relatively low, threading can be carried out simply by suctioning with the suction gun 3. However, when the temperature of the tube wall is high, a problem arises in that the threads 2 are fused together, similar to the method described above. In order to prevent this, it is necessary to lower the temperature once during threading, but especially for those equipped with a heating medium-filled heater 4, etc., the tube wall temperature does not drop easily and threading becomes possible. A problem arises in that the waiting time until the end of the process becomes longer and productivity decreases.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 52-55718, there is a method in which the heater that controls the heating of the heat treatment tube is split in half to facilitate threading. Because of the type heater, it is difficult to ensure uniformity of temperature distribution within the tube, and there is a problem in that uniform heat treatment performance, which is required before threading can be facilitated, is impaired.

Purpose of the Invention It is an object of the present invention to provide a threading method that can reliably thread a thread through a heat treatment tube in a short time without impairing the uniform heat treatment performance of the heat treatment apparatus, in contrast to the above-mentioned conventional techniques. There is a particular thing.

Structure of the Invention A method for threading a heat treatment device in accordance with this purpose is as follows:
In a threading method for threading into a heat treatment device in which the yarn is heat treated by passing it through a heat treatment tube, a removable blower gun is attached to the yarn introduction side of the heat treatment tube, and the blower gun cools the yarn to a temperature lower than the tube wall of the heat treatment tube. The method comprises the steps of blowing wind, passing the thread through the heat treatment tube while being accompanied by the cooling air, and removing the blowing gun from the heat treatment tube after threading.

Effect of the Invention In this threading method, since the blower gun is attached only during threading, the tube wall of the blower gun itself is threaded in a low temperature state, and furthermore, just before threading, the tube wall of the blower gun is attached to the heat-treated tube. Since the cooling air is blown into the heat treatment tube at high speed, the temperature is quickly reduced only in the vicinity of the inner surface of the tube wall of the heat treatment tube. In this state, the yarn is passed through the heat treatment tube at high speed, accompanied by the blown cooling air, that is, along with the force of the cooling air flow. As a result, the wall of the heat-treated tube is cooled to a predetermined low temperature during threading, so the thread is passed through the heat-treated tube without being fused. Since it is only near the inner surface of the wall,
After threading, by stopping the supply of cooling air, the temperature is returned to the predetermined heat treatment temperature in a short time. Moreover, since the blower gun is attached only when necessary during threading and removed after threading, the installation time is very short, and the low-temperature blower gun takes away the heat from the heat treatment equipment and threads the thread. There is no need to delay the return time to the predetermined temperature after passing.

Effects of the Invention Therefore, according to the present invention, the wall temperature of the heat treatment tube can be lowered to a predetermined low temperature in a short time without impairing the uniform heat treatment performance of the heat treatment tube due to the structure of the apparatus. In addition to being able to reliably thread the thread without fusion,
After threading, it is possible to return to the predetermined heat treatment temperature in a short period of time, improving threading reliability, minimizing lost time and amount of waste thread during threading, and greatly increasing productivity. The effect is that it can be improved.

Embodiments Hereinafter, preferred embodiments of the method for threading through a heat treatment apparatus of the present invention will be described with reference to the drawings.

2 to 7 show a heat treatment apparatus for carrying out a threading method according to an embodiment of the present invention.

Figure 2 shows an example of the arrangement of heat treatment equipment.
The case is shown when applied to a direct spinning/drawing method.
A spinneret 11 for melt-spinning the yarn 10, a chimney 12,
The heat treatment device 18 is included in the direct spinning/drawing device, which is equipped with a threading machine 13, an oil ring roller 14, a first roller 15, a second roller 16, and a winding machine 17.
shows the case where it is disposed between the chimney 12 and the threading machine 13. The heat treatment device 18 is provided with a heat treatment tube 19 for heat treating the yarn 10 by passing the tube through the tube.

A blow gun 20 as shown in FIG. 3 is attached to the thread 10 introduction side of the heat treatment tube 19 for threading. The blower gun 20 is connected to the heat treatment tube 1
a block 24 having a pipe 21 inserted into the yarn introduction side of the pipe 9; a compressed air passage 22 provided at the upper end of the pipe 21; and a compressed air injection hole 23 for injecting compressed air from the compressed air passage 22 into the pipe 21; pipe 2
1 and a cylindrical cover 25 rotatably fitted around the outer periphery of the cover 1. The blower gun 20 is fixed by a screw 26 after its pipe 21 is inserted into the heat treatment tube 19, and the compressed air passage 22 is supplied with cooling air at a predetermined temperature from a compressed air supply source (not shown).

The block 24 is formed with a slit-shaped suction port 27 that extends vertically and serves as a suction passage for the thread 10 during threading, that is, as a path for the thread 10 to pass through. A slit 28 is provided in a portion of the pipe 21 extending downward from the suction port 27 in a direction parallel to the axis of the pipe 21 over the entire length of the pipe 21. In correspondence with this slit 28, the cover 25 is also provided with a slit 29 over the entire length of the cover 25, and as shown in FIGS. 4 and 5, the pipe 21 can be opened by rotating the cover 25. The slit 28 and the slit 29 of the cover 25 are aligned, and the inner peripheral surface of the cover 25 covers the slit 28.

6 and 7 show the positional relationship between the thread 10 and the suction port 27 in more detail. Air is drawn into the pipe 21 through the suction port 27 by being pulled by the high-speed flow jetted into the pipe 21 from the compressed air jet hole 23 . The yarn 10 is sucked along with this air flow, and in order to further suction the yarn 10 strongly and reliably, as shown in FIGS. 31a and 31b may be provided at two or more locations. In addition, as shown in the figure, the suction port 32 is
The thread 10 is formed so that its cross section has an elongated slit shape, and the thread 10 to be sucked passes through the compressed air jet holes 31a, 31.
By passing through the space between b, a balanced and stronger suction force can be obtained.

The method of the present invention is carried out as follows using the heat treatment apparatus configured as described above.

As shown in FIG. 10 A, B, C, and D, the threading order is as shown in FIG. The blow gun 20 is attached to the thread introduction side of the heat treatment tube 19 and fixed with a screw 26.

Next, cooling air at a predetermined temperature is sent from the compressed air supply source to the air blowing gun 20, and the cooling air is ejected from the compressed air blowing hole 23 toward the inside of the pipe 21 and the heat treatment tube 19. During this cooling air injection, the cover 25 of the blower gun 20 is rotated, and the slit 28 of the pipe 21 is inserted into the cover 25 as shown in FIG.
Covered by 5. That is, the cooling air injected from the compressed air outlet 23 expands in the pipe 21 and becomes a high-speed flow, so that negative pressure is generated in the suction port 27 and the slit 28 portion of the pipe 21, and this negative pressure causes the However, if the slit 28 is long, the air that gradually expands from the negative pressure near the suction port 27 will be sucked into the slit 28.
Because it tries to eject outside of the pipe 21,
A cover 25 is required. If the length of the slit 28 of the pipe 21 is short, the cover 25 is not necessary, but if the pipe 21 is made longer for ease of thread threading, the cover 25 is required.
By covering the slit 28 with the thread 5, the negative pressure area is limited and the threading operation is facilitated.

When the cooling air is blown into the heat treatment tube 19 at a high speed, the temperature of the inner wall surface of the heat treatment tube 19 is lowered to a predetermined low temperature, and threading becomes possible. Since the temperature of the tube wall of the heat treatment tube 19 is lowered by the high-speed cooling air, only the temperature near the inner wall surface is rapidly lowered, and the temperature is lowered to a predetermined temperature in a short period of time. Furthermore, the temperature of the wall surface of the suction port 27 of the blower gun 20 and the pipe 21 is originally kept low because the blower gun 20 is attached only when threading. Therefore, the inner wall surfaces of the blower gun 20 and the heat treatment tube 19 serve as paths for the thread 10 during threading.
It is maintained at a low temperature that allows threading in a short time.

Next, as shown in FIG. 10B, the suction gun 33 is moved and the thread 10 is brought close to the suction port 27 of the blower gun 20. Then, the thread 10 is cut, and the cut thread 10 is sucked into the pipe 21 from the suction port 27 and is further passed through the heat treatment tube 19 along with the high-speed airflow inside the pipe 21 and the heat treatment tube 19. . In cutting the thread 10, the thread 10 is sucked into the pipe 21 and passed through the heat treatment tube 19 by simply weakening the suction force of the suction gun 33.
may be cut. Heat treatment tube 1
The thread 10 passed through the thread 9 is suctioned by, for example, another suction gun 34, as shown in FIG. 10C.

At the time of this threading, since the inner wall surface temperature of the heat treatment tube 19 has already been lowered as described above, the thread 10 is reliably passed through the heat treatment tube 19 at high speed along with the high-speed airflow without being fused. .

Next, the supply of cooling air to the blower gun 20 is stopped, the cover 25 of the blower gun 20 is rotated,
As shown in FIG. 4, the slit 2 of the pipe 21
The slit 29 of the cover 25 is aligned with the position 8. Then, the blower gun 20 connects to the heat treatment tube 19.
a slit 28 extracted from the
While passing the thread 10 through the slit 29, blow the air gun 10.
is removed, and the state shown in Fig. 10D is reached, and the threading operation is completed.

By stopping the supply of cooling air from the blower gun 20, the temperature of the inner wall of the heat treatment tube 19 is raised again, but since only the surface of the inner wall has been cooled until then, the temperature of the heat treatment tube 19 is reduced for a short time. The temperature is then returned to the predetermined heat treatment temperature. Furthermore, since the blower gun 20 is attached only during the threading operation, which is carried out efficiently and in a short time, as described above, and is removed thereafter, the heat treatment tube 19 can be removed by attaching the blower gun 20 at a low temperature. It does not significantly reduce its temperature. Therefore,
Since the attachment of the blower gun 20 does not significantly affect the return of the heat treatment tube 19 to the predetermined temperature, the return is accomplished in a short time.

As is clear from the above description, according to this embodiment, the wall surface temperature of the heat treatment tube 10 can be kept at a predetermined low temperature, and threading can be reliably carried out.
By minimizing the time required to lower the wall surface temperature and return to the predetermined heat treatment temperature after threading, it is possible to significantly reduce loss time and waste yarn amount. This reliability of threading and shortening of threading work time can greatly improve productivity.

Note that the present invention can be applied not only to threading through a heat treatment device, but also to the delivery and delivery of yarn over long distances, such as several meters, in melt spinning and the like.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a heat treatment device showing an example of a conventional threading method, and FIG. 2 is a longitudinal cross-sectional view of a direct spinning/drawing device showing an example of the arrangement of a heat treatment device for carrying out a method according to an embodiment of the present invention. 3 is a partial vertical cross-sectional view of the apparatus shown in Fig. 2 with a blow gun attached to the heat treatment tube, Fig. 4 is a side view showing one state of the apparatus shown in Fig. 3, and Fig. 5 is a partial longitudinal sectional view of the apparatus shown in Fig. 3 is a side view showing another state of the device; FIG. 6 is an enlarged cross-sectional view taken along the - line in FIG. 4; FIG. 7 is a plan view of the device in FIG. 6;
Fig. 8 is a cross-sectional view showing another embodiment of the device shown in Fig. 6, Fig. 9 is a plan view of the device shown in Fig. 8, and Fig. 10 shows the order of threading. FIG. 3 is a front view of the area around the heat treatment tube shown in FIG. 10... Thread, 11... Mouthpiece, 18... Heat treatment device, 19... Heat treatment tube, 20... Air blow gun, 21... Pipe, 22, 30... Pressure air passage,
23, 31a, 31b...compressed air outlet, 25...
Cover, 27, 32... Suction port, 28, 29...
Slits, 33, 34...Sexy gun.

Claims (1)

[Claims] 1. In a method of threading a thread through a heat treatment device in which the thread is heat treated by passing it through a heat treatment tube, a removable blower gun is attached to the yarn introduction side of the heat treatment tube, and the blower gun is used to heat the yarn at a temperature lower than the tube wall of the heat treatment tube. A method for threading thread into a heat treatment apparatus, which comprises blowing cooling air, passing the thread into a heat treatment tube accompanied by the cooling air, and removing the blower gun from the heat treatment tube after threading.