What are the five common causes of appearance defects in rubber sheathed cables?

During the production process of rubber-sheathed cables, various aesthetic defects often arise, such as uneven surfaces, the presence of clinker particles (early vulcanized rubber particles) or impurities, scratches and abrasions on the cable surface, surface depressions, and spiral patterns. Below are five common causes of these aesthetic defects in rubber-sheathed cables:

1. The mold's wire-holding length being either too long or too short, a rough mold opening with an oversized aperture, low temperatures at the head, mold, or machine body, and low plasticity of the rubber material can all contribute to an uneven surface on rubber-sheathed cables.

2. Impurities in the supplied rubber, a short burning time for the rubber material, excessively high temperatures in the extruder body, head, or die, poor rubber flow with dead corners in the head, and rough or adhesive screw surfaces can lead to the presence of clinker particles (early vulcanized rubber particles) or impurities on the cable surface.

3. A non-smooth mold without chamfers, impurities or rubber particles blocking the die opening, abrasions caused by dragging pipes in the curing tube, and a rubber sealing gasket with a too-small aperture at the curing tube exit can all result in scratches and abrasions on the surface of rubber-sheathed cables.

4. Oversized die apertures, excessive gaps between the outer strands and filaments of the conductive wire core, uneven outer diameter of the cable core, low plasticity and poor viscosity of the rubber material, impurities in the rubber, short mold distances, and low pressure can cause surface depressions in rubber-sheathed cables.

5. A die aperture that is too small, insufficient rubber extrusion leading to unfilled gaps in the wire core, jumps in the conductive wire core or cable core, and short mold distances can result in spiral patterns on the surface of rubber-sheathed cables.

Rubber-sheathed cables are a type of soft, flexible cable made from multiple strands of fine copper wire as conductors, with rubber insulation and a rubber sheath. Generally, this category includes common rubber-sheathed flexible cables, welding machine cables, submersible motor cables, radio device cables, and photography light source cables.

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