What is the problem of black streaks on the surface when producing silicone rubber cables? How are the conductors of mineral insulated cables produced? How is PP foam for cables extruded?

1.What kind of drawing machine can produce conductor of BTTZ mineral insulated cable?

BTTZ currently has two processes: one is the magnesium oxide powder prefabricated into a porcelain column, stuffed into a fixed-length copper tube and a fixed-length conductor, annealed, drawn and annealed again, and then drawn, all the way to the conductor fixed specifications; another process is continuous filling powder (magnesium oxide) in a fixed-length copper tube, still while annealed and drawn to the specified specifications.

2.What kind of wire drawing touch tool can make the drawn copper conductor as bright as the copper conductor extruded from the copper extruder?

Extrusion and drawing are different processes, and drawing requires lubricating fluid, so it is impossible to achieve the same brightness as the copper extrusion machine. Any process has a specific scope of application, pulling system can not completely replace the copper extrusion machine.

3.All wire standards have a sentence in the color separation "Any multi-core cable should not use green and yellow that is not a combination of color", how should I understand this sentence?

If a combination yellow/green core is present in the harness, then no pure yellow or green cores are allowed in this harness.

4.How is the foamed PP material for the cable industry extruded?

The use of physical foaming, nitrogen as a gas (nitrogen injection with high pressure). But PP foaming is not good to do (hollow white), PE physical foaming is easy to control. Communication cable for the dielectric constant, most of the use of nitrogen and other inert gases.

5.In the process of producing silicone rubber cables, why does the surface produce black streaks?

A: From the material point of view the possibility is very low, whether it is platinum silica gel or peroxide silica gel are no substances that can turn black, and moreover the temperature is not high. The biggest possibility is from the equipment, that is, the head part. But the specific equipment is the residual glue or equipment wear and tear or equipment oil, which requires the customer to check.

A more accurate identification method is to use nuclear magnetic cracking, analysis of the composition, to see what the black part of the specific composition. Because the composition of silicone rubber itself is very simple, the composition analysis is easier to distinguish and identify.

B: The basic control point of silicone rubber extrusion is to remove the shear heat through cooling, to maintain a very low temperature of the rubber, should not exceed 30 ℃, otherwise the rubber is sticky, in the dead corner to stay. The cooling of domestic machines is not good, some heads are not even cooled, and the current workshop temperature is too high.