Reasons for appearance defects of rubber sheathed cables

In the production process of rubber-sheathed cables, appearance defects often appear, such as the surface is not smooth; there are clinker particles (early vulcanized rubber particles) or impurities on the surface; scratches and abrasions on the wire and cable surface; collapse on the surface; hemp on the surface Pattern etc. The following are five common causes of appearance defects in rubber sheathed cables:

1. Too long or too short die sleeve bearing wire, die mouth is not smooth and the hole diameter is too large; the temperature of the machine head, die mouth or body is low; the rubber plasticity is small, etc., which may cause the surface of the rubber cable to be not smooth.

2. The supplied rubber is not clean and contains impurities; the scorching time of the rubber is too short; the temperature of the extruded rubber body, head or die is too high; the rubber in the head is not flowing smoothly, and there are dead corners of rubber stuck; the screw is not smooth , Viscose, etc. may cause clinker particles (early vulcanized rubber particles) or impurities on the surface of the rubber sheathed cable.

3. The mold sleeve is not smooth and has no chamfers; there are impurities or cooked rubber particles blocking the mold opening; dragging the tube inside the vulcanized tube scratches; the small diameter of the rubber gasket at the outlet of the vulcanized tube may cause scratches on the surface of the rubber sheathed cable. , Bruises.

4. The aperture of the die sleeve is too large; the gap between the outer strands of the conductive core and the monofilament is too large, and the outer diameter of the cable core is uneven; the plasticity of the rubber is small, and the viscosity is poor; there are impurities in the rubber; the distance between the molds is small, Low pressure, etc. may cause the surface of the rubber sheathed cable to collapse.

5. The aperture of the die sleeve is too small; the rubber material is not extruded enough, and the gap of the core is not filled; the conductive core or the cable core jumper; the short distance between the molds, etc. may cause the surface of the rubber cable