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In the production process of rubber sheathed cable, appearance defects often appear, such as the surface is not smooth; There are clinker particles (early vulcanized rubber particles) or impurities on the surface; Scratch and scratch on the surface of wires and AAC Cables; There is collapse on the surface; There are twist patterns on the surface. The following are five common causes of appearance defects of rubber sheathed cables collected by cable network on the network for reference of rubber sheathed cable manufacturers:
First, the die sleeve line is too long or too short, the die mouth is not smooth and the hole diameter is too large; The temperature of head, die or fuselage is low; The low plasticity of rubber may lead to unsmooth surface of rubber sheathed cable.
Second, the rubber supplied is not clean and contains impurities; The scorch time is too short; The temperature of rubber extrusion body, die or die is too high; The rubber flow in the head is not smooth, and there is a dead angle of rubber retention; The unsmooth screw and viscose may cause clinker particles (early vulcanized rubber particles) or impurities on the surface of rubber sheathed cable.
Third, the die sleeve is not smooth and has no chamfer; There are impurities or rubber particles blocking the die; Drag the tube inside the vulcanization tube and scratch it; The small diameter of rubber gasket at the outlet of vulcanization pipe may cause Scratch and scratch on the surface of rubber sheathed cable.
Fourth, the hole diameter of die sleeve is too large; The gap between strands and monofilaments in the outer layer of conductive core is too large, and the outer diameter of cable core is uneven; The rubber has low plasticity and poor viscosity; There are impurities in the rubber; Small die distance and small pressure may cause surface collapse of rubber sheathed cable.
Fifthly, the hole diameter of die sleeve is too small; The rubber extrusion is insufficient, and the gap of wire core is not filled; Conducting core or cable core jumper; The short distance to the mold may lead to the appearance of twist on the surface of the rubber sheathed cable.