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1. Molded wire is too long or too short, die mouth is not smooth and the hole diameter is too large; the head, die or body temperature is low; the plastic material of the rubber is small, etc., all of which may cause the surface of the rubber sheath cable to be not smooth.
2. The supplied rubber is not clean, contains impurities; the scorching time of the rubber compound is too short; the rubber body, head or die temperature is too high; the rubber flow in the head is not smooth, there is a dead corner of the rubber; the screw is not smooth Glue, etc., may cause clinker particles (early vulcanized rubber particles) or impurities on the surface of the rubber cable.
3 mold sets are not smooth, no chamfer; there are impurities or rubber particles blocking the die mouth; drag pipe in the vulcanization tube scratches; vulcanized pipe outlet sealing rubber gasket aperture is too small, etc. may cause scratches on the surface of the rubber cable , bruises.
4. The die set hole diameter is too large; between the outer strands of the conductive wire core, the gap between the monofilaments is larger, and the core diameter is not uniform; the rubber material has a small plasticity, and the adhesiveness is poor; the rubber material has impurities; the distance between the molds is small; Small pressure, etc. may cause the surface of the rubber cable to collapse.
5. The die set hole diameter is too small; insufficient extrusion of the rubber material, filling of the core gap; conductive wire core or cable jumper; short distance between the die and the like may cause hemp patterns on the surface of the rubber sheath cable.
The rubber sheathed cable is a kind of soft and movable cable variety which is made of multiple strands of fine copper wire, outsourcing rubber insulation and rubber sheath. In general, it includes general rubber sheathed flexible cables, welding machine cables, submersible motor cables, radio equipment cables, and photographic light cables.
How to choose wire and cable? 1. The nominal section of the wire and cable (cross-sectional area of ​​the conductor) should be selected based on the power of the appliance. 2. The wire and cable have no safety certification (with the Great Wall logo) and industrial product production license. 3. Wire and cable must be printed with the manufacturer's name, product model, and continuous voltage rating. 4. Whether the copper wire is oxidized (blackened is unacceptable). 5. The tensile strength of the plastic is sufficient (substandard plastic can be hand-torn).
6. The product has no certificate (certificate should have the seal of the inspector, production date, model, specifications, voltage levels and implementation of standards). 7. Is there a quality inspection report for the technical supervision department? The fire department also stipulates that high-rise buildings, densely populated areas, power stations, subways, etc. must use wire and cable with flame-retardant or fire-resistant properties, and must have a permit for production and a sales permit issued by the fire department. All households use wires and cables. Since the quality of wire and cable products currently on the market is uneven, if consumers cannot correctly judge their quality or do not understand the manufacturer’s quality assurance ability, they should go directly to the manufacturer’s purchase or technical supervision department. advisory.
Rubber sheath appearance defects
In the production process of rubber sheathed cables, appearance defects often occur, such as the surface is not smooth; the surface of clinker particles (early vulcanized rubber particles) or impurities; wire and cable surface scratches, scratches; surface collapse; surface Ma pattern and so on. The following are the five common causes of appearance defects in rubber cable: