JPS60146026A - Heat setting apparatus of false twister - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat setting device for a false twisting machine,
To provide a heat setting device that has a fast response speed for temperature control, can perform accurate temperature control, efficiently transmits heat to the yarn, has a small amount of heat escaping from the device to the outside, and has low power consumption. It is something.

Figure 1 shows an example of the structure of a false twisting machine, where 1 is a burn before false twisting, 2 is a guide, 3 is a supply roller, 4 is a heat setting device, 5 is a cooling device, 6 is a guide, 7 is the false twist part,
8 is a take-up roller, 9 is a guide, and 10 is a package of falsely twisted yarn.

The yarn 11 supplied from the burn 1 to the false twisting process via the kite 2 and the supply roller 3 is twisted in the false twisting section 7, taken up by the take-up roller 8, and wound into the package 10. At this time, the false twist generated in the yarn between the false twisting section 7 and the supply roller 3 is heated by the heat setting device 4, and is cooled and fixed by the cooling section 5. The temperature of the heat setting device 4 is set to about 210 degrees, although the temperature varies depending on the type and thickness of the yarn 11, the yarn speed, the structure of the device, etc., and the yarn 11 is placed on the heating surface 12 of the heat setting device 4. It is heated by sliding contact or close running.

FIG. 2 is a sectional view showing the structure of a conventional heat setting device 4, in which 13 is a heat storage plate, 14 is a heat-resistant insulating plate, 15 is a heater, 16 is a heat insulating material, and 17 is a case. The heat storage plate 13 is
It is heated by a heater 15 via an insulating plate 14,
The yarn 11 is in sliding contact with the heating surface 12 of the heat storage plate 13 and is indirectly heated by the heater 15 via the insulator 14 and the heat storage plate 13. However, this heat storage plate has a surface area 300 to 1000 times that of the yarn 11, and the amount of heat transferred to the yarn 11 is less than 5% of the amount of heat generated by the heater 15. Most of it is dissipated into the surrounding area. As a result, the temperature in the room where the false twisting machines are installed increases, and when operating a large number of false twisting machines, it is necessary to cool the room with an air conditioner not only in summer but also in winter. In addition, yarn 11
Since the heating is performed indirectly through the insulating plate 14 and the heat storage plate 13, there are problems in that heat transfer is very slow, heat loss is large, and the responsiveness of temperature control is also poor. In order to compensate for the poor responsiveness of temperature control, the heat capacity of the heat storage plate 13 must be increased to a certain extent, and this results in a vicious cycle in which the surface area of the heat storage plate 13 increases and heat loss to the surroundings increases. It was happening.

This invention was made in order to solve the drawbacks of the conventional peel-setting device described above, and uses a conductive ceramic molded body as a heater, and heats the conductive ceramic molded body by applying electricity to the yarn 11. By heating directly with the heater, the thermal response of the heat setting device is improved, temperature control can be performed accurately and quickly, and the heat from the heater is efficiently transferred to the yarn. This is what I did.

That is, the heat setting device of the false twisting machine of the present invention
Conductive ceramic molded bodies 18a, 18b, 18C in the shape of elongated strips or cylinders are arranged along the path of
The method is characterized in that the filament 11 is directly heated by supplying electricity to the conductive ceramic molded body and causing the ceramic molded body to generate heat. explain.

FIG. 3 is a sectional view showing an embodiment of the heat setting device of the present invention, in which 18a is a strip-shaped conductive ceramic molded body;
16 is a heat insulating material, 17 is a case, 19 is a bolt screwed onto the bolt 17, and 20 is a short cylindrical holding piece. The holding piece 20 is made of a heat-resistant insulator, and the bolt 19 is inserted into the center hole thereof, and the conductive ceramic molded body 18a is pressed by the stepped portion 21, and the heat insulating material 16 is pressed against the holding piece 20. It is fixed on top. Further, this holding piece 20 is attached to a thread 11 running along the conductive ceramic molded body 18a.
It also serves as a side guide.

Conductive ceramic molded body 18a (and 18b18c
) mainly consists of oxide-based ceramic materials, non-oxide-based ceramic materials such as carbides, nitrides, silicides, and borides, or blended materials of these oxide-based 'kA' H and non-oxide-based materials. Fine powders as components or fine powders made by blending these materials with 5% or less of metal components are tightly sintered, or the surface of an insulating ceramic molded body is coated with a conductive ceramic layer. As for its characteristics, it must have a uniform, fine, and dense structure, and must have higher hardness and wear resistance than metal heater materials. For example, the strip-shaped conductive ceramic molded body 18a of the illustrated embodiment is made of two uniformly fine material powders.
It is formed into a strip shape with a thickness of 0.7 mm, a width of 6 mm, and a length of 100 mm under a pressure of 0.000 atm, and is made of A110, - Tic material or SiC type material, or A1 and 0. ! TIN+T+ is applied to the surface of an insulating ceramic molded body made from a base material.
A conductive ceramic layer uniformly coated with a conductive ceramic layer with a thickness of 10 microns is used. In addition to these materials, for example, materials such as zirconium titanate, or 5% l- of metal fine powder such as Nj + Cr are added to these materials.
Conductive ceramic molded body 1 using feathers etc. blended below.
88 (and 18b, 18C) can be manufactured. The above-mentioned fine metal powder is blended to adjust the resistance value of the conductive ceramic molded body, but if it is blended with more than 5%, the wear resistance of the molded body will decrease rapidly. Furthermore, there is a risk that the molded article will be damaged due to the difference in coefficient of thermal expansion between the materials.

Configured as above. Conductive ceramic molded body 18
a (and 18b, 18c), if the structure of the material is grain-sized, the strength and hardness will inevitably decrease, and the possibility of damage due to rapid heat during energization, that is, thermal shock bonding, will increase, When threads are brought into sliding contact, the sliding contact surface tends to become rough due to abrasion, which causes fuzzing, etc., to occur in the processed thread. Furthermore, if the hardness of the ceramic molded body is low, the WIFIM abrasion resistance will be reduced, making it difficult to obtain twisted yarn of a constant quality, and the life of the heater will also be shortened. Furthermore, if the internal structure of the ceramic molded body is not dense and there are many spots, the yarn may become fluffy, and the glue or oil contained in the yarn may adhere to the spots or minute parts of the sliding surface. This is not preferable because it impairs its function as a heater and makes it difficult to remove. Note that the electrical resistance value of such a conductive ceramic molded body is about 500 to 2000 times that of nichrome wire.

In order to improve the responsiveness of temperature control and to reduce heat dissipation from the surface, it is better to make the surface area of the conductive ceramic molded body as small as possible.

The strip-shaped conductive ceramic molded body 18a is arranged along the path of the thread 11 as shown in FIG.
A heating section A of a predetermined length is formed by applying current between Vb and Vb.

22 is a plurality of conductive ceramic molded bodies 18a.
It is a metal plate whose ends are electrically connected. Of course, the entire length of the heating section A may be formed by one conductive ceramic molded body, but if the heating section A is to have a temperature gradient or local temperature control is to be performed, a plurality of conductive ceramic molded bodies may be formed as in the illustrated embodiment. It is better to have a structure in which they are arranged in series. The temperature of the conductive ceramic molded body 18a is detected by a temperature sensor 23 such as a thermistor or an infrared sensor, and is detected by a controller 24.
The applied voltage is applied to the voltage regulator 25 via the voltage regulator 25 to control the applied voltage. In a test using a conductive ceramic molded body 18a mainly composed of 8 AI, 03-Tic materials, +2 at both ends.
When V is applied, heat is generated so much that it can be felt in the hand, and 3
At 0V, a considerable amount of heat was generated, but at 100V, it was possible to heat up to 200 degrees in about 1 second, and the temperature fluctuation from the set temperature could be suppressed to 1.5 degrees or less. In addition, the surface area of the conductive ceramic molded body 18a is about 25 times that of the thread 11, and even in the tests using the conductive ceramic molded bodies of various materials mentioned above, the set temperature was reached in a very short time, and the consumption The power consumption was about 30% of the conventional device.

In the above embodiment, the conductive ceramic material was formed into a rectangular shape in consideration of the convenience of molding, but as shown in FIG. It is also possible to have a circular tube shape as shown in FIG. 6, and to allow the thread tube 11 to pass through the center hole 27 of the tube. Furthermore, by varying the cross-sectional area of the conductive ceramic molded body along the thread path, or by changing the cross-sectional area of the conductive ceramic molded body along the thread path, an independent voltage regulator and temperature control can be provided for each of the plurality of conductive ceramic molded bodies arranged along the thread path. It is also possible to freely set the temperature of each part of the heating section A by providing a sensor and controlling the temperature separately.

As described above, the heat setting device of the present invention uses a conductive ceramic molded body as a heater, and directly heats the yarn by sliding the yarn into contact with or running close to the conductive ceramic molded body. Because of this, heat is efficiently and quickly transferred to the yarn, making it possible to accurately control the heating temperature, and making the heat generating part smaller, which greatly reduces heat dissipation to the surroundings. can be reduced,
Uniform, high-quality twisted yarn can be obtained, and the power consumed by the heat setting device of the false twisting machine can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the structure of a false twisting machine, FIG. 2 is a sectional view of a conventional heat setting device, FIG. 3 is a sectional view showing an embodiment of the heat setting device of the present invention, and FIG. The figure schematically shows the arrangement of the conductive ceramic molded body and its control system, and FIGS. 5 and 6 are diagrams showing other shapes of the conductive ceramic molded body. In the figure, 3 is a supply roller, 4 is a heat setting device, 7 is a false twisting section, 8 is a take-up roller, 11 is a yarn, 16 is a heat insulation layer, 1
7 is a case, 18a, 18b, 18C are conductive ceramic molded bodies, 20 is a holding piece, 23 is a temperature sensor, 24
is a controller, 25 is a voltage regulator, and A is a heating section. Agent Patent Attorney Nishi Roo No. 1N Figure 4 Figure 5

Claims (4)

[Claims] (1) A conductive ceramic molded body in the form of an elongated strip or a circular tube is arranged along the path of the yarn, and the yarn is directly heated by applying electricity to the conductive ceramic molded body to generate heat. A heat setting device for a false twisting machine, which is characterized by: (2) The heat setting device according to claim 1, wherein the conductive ceramic molded body is molded from an oxide ceramic material, a non-oxide ceramic material, or a mixture of these materials. . (3) The P-1-set device according to claim 2, wherein the conductive ceramic molded body is molded using the material described in the preceding paragraph with a metal component of 5% or less. (4) The heat setting device according to claim 1, wherein the conductive ceramic molded body is formed by coating the surface of an insulating ceramic molded body with a conductive ceramic layer.