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yun yang's Blogs >> yyang Cable conductor preheating

In the production process, we often encounter conductor needs to warm up, but do not know enough about the conductor the preheating reason and process parameters set following conductor preheated information:

A conductor preheated

1, the conductor or stranded conductors, placed in an oven dried;
2, using a barrel-type preheater, the discharge line conductor insulation extrusion synchronization dried;
3 hot hair blowing directly aligned conductor;
4, the use of heaters, of uninterrupted baking put the spool;
5, using inductive preheater, the pair of conductors in insulation extrusion synchronization dried;

, Conductor preheating

1, the removal of moisture to avoid the generation of the bubble in the insulating
As conductors used more than a fiber-filled, the fibrous material has a water absorption of 3% to 5%, in the fibers had not been dried under the premise, extrusion, the extrusion temperature of 150 ¡ã C or above, moisture evaporation, rapid expansion of ABC Cable Manufacturers
the steam, When the insulation thickness is thinner, the strength of the lysosomal not the case, the bubbles, and will also result in breaking plastic phenomenon. At the same time, the surface of the copper conductor will moisture, the same consequences.
2, to improve the adhesion of the insulating material
Insulation extrusion conductor temperature usually at room temperature about 15 ¡æ ~ 30 ¡æ, insulating rubber temperature (eye mode at) about 120 ¡æ ~ 220 ¡æ, which means that the temperature difference between the two in the 100 ¡ã C to 200 ¡æ. Under such a large temperature difference, the insulating plastic material in the contact to the conductor surface, the contact surface material is rapidly cooled, the wires out of the mold, the outer-layer plastic material is cooled slowly. Rapid cooling of the plastic material, the surface hardness increases, reducing the adhesion of the plastic material and the conductor. In the same time, the plastic material of the cooling crystallization of the shrinking process, when under the condition of the insulation thickness is relatively thick, the inner layer of the insulating outer layer dyssynchrony the force of contraction in the outer layer of plastic material is cooled so that the inner layer by the outwardly stretched caused adhesion.
Third, the conductor preheating process set

Conductor hotter the temperature or the preheating current should be set according to the device specifications, the insulation thickness, the process temperature of the insulating material, the production speed, ambient temperature, preheater and eye die distance related to the same time as the conductor center filled fiber material certain heat temperature, the preheating process is not a ACAR Overhead Conductor
value. Preheating of the conductors is an annealing process at the same time, is likely to cause the conductor intensity, the change in resistance, therefore the setting of the preheating process is to reduce the temperature between the conductor and insulation as far as possible without changing the conditions of the conductor performance, while with good hot water cooling process.

Fourth, the conductor preheating Note

1, the premise to guarantee the stability of the actinomycetes the preheater and nose as close as possible to avoid heat loss;
2, the production debugging disconnection processing and exception handling, should be concerned about the the preheat temperature changes; necessary when you need to temporarily turn off the preheater;
3, when the conductor surface moisture is more serious, into the preheater ago should wipe avoid the conductor oxidation and produce spots;