Reasons for appearance defects of five rubber sheathed cables

In the production process of rubber sheathed cables, appearance defects often appear, such as rough surface; clinker particles (early vulcanized rubber particles) or impurities on the surface; scratches and abrasions on the surface of wires and cables; subsidence on the surface; Hemp pattern and so on.

The following are five common causes of cosmetic defects in rubber-sheathed cables:

1. Too long or too short die sleeve support line, rough die opening and too large aperture; low temperature of machine head, die opening or fuselage; low plasticity of rubber, etc. may cause the surface of rubber sheath cable to be rough.

2. The supplied rubber is not clean and contains impurities; the scorch time of the rubber material is too short; the temperature of the extruding body, machine head or die is too high; the rubber flow in the machine head is not smooth, and there are rubber retention dead ends; the screw is not smooth , viscose, etc. may cause clinker particles (early vulcanized rubber particles) or impurities to appear on the surface of the rubber sheath cable.

3. The mold sleeve is not smooth and has no chamfer; there are impurities or cooked rubber particles blocking the mold opening; dragging the tube in the vulcanized tube is scratched; the hole diameter of the vulcanized tube outlet sealing rubber gasket is too small, etc., which may cause scratches on the surface of the rubber sheath cable , scratches.

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

5. The hole diameter of the mold sleeve is too small; the rubber material is not extruded enough, the core gap is not filled; the conductive core or the cable core jumper; the mold-to-mold distance is short, etc., which may cause the surface of the rubber sheath cable to appear.

Rubber sheathed cable is a kind of soft and movable cable with multi-strand thin copper wire as conductor, rubber insulation and rubber sheath. Generally speaking, it includes general-purpose rubber-sheathed flexible cables, electric welding machine cables, submersible motor cables, radio device cables, and photographic light source cables.

Rubber sheathed cables are widely used in various electrical equipment, such as household appliances, electric machinery, electrical equipment and portable power cords for appliances. At the same time, it can be used in indoor or outdoor environmental conditions. According to the external mechanical force of the cable, the product structure is divided into three categories: light, medium and heavy. There is also proper articulation in section.

Generally, light-duty rubber-sheathed cables are used in household appliances and small electric equipment, requiring softness, lightness, and good bending performance;

In addition to industrial use, medium-sized rubber-sheathed cables are widely used in agricultural electrification;

Heavy-duty cables are used in occasions such as port machinery, searchlights, and large-scale hydraulic drainage and irrigation stations for household businesses. This type of product has good versatility, complete series of specifications, good and stable performance.

Waterproof rubber sheathed cables and cables for submersible pumps: mainly used for supporting submersible motors, the models are JHS, JHSB.

Cables for radio devices: At present, two types of rubber sheathed cables (one shielded and one unshielded) are mainly produced, which can basically meet the requirements. The models are WYHD and WYHDP.

Cable products for photography: Cooperating with the development of new light sources, it has small structure and good performance, and meets the needs of indoor and field work at the same time, gradually replacing some old products that are heavy and poor in heat resistance.

Operation method:

1. Set the temperature and time according to the vulcanization system of the rubber

2. Use rubber ink thinner to wash and repair the repaired part, especially the joint should be fully treated.

3. According to the size of the gap, cut the repair rubber in an appropriate amount, and be careful not to overdo or underdo it.

4. Put the cut rubber material in the gap, and pay attention that the rubber material should not be higher than the circumferential surface of the wire.

5. Wrap it with high temperature resistant PP tape. And put it into the tubular mold cavity slightly smaller than the diameter of the wire, lock the upper and lower molds, so that the patched position has a certain pressure. Note that the cavity diameter is slightly smaller than the wire diameter by 0.1~0.2mm.

6. When the vulcanization time is up, take out the product. If there is a small amount of rubber overflowing, repair it with a sharp blade and wipe it off with a thinner.

Authentication method:

Press an appropriate amount of air into the repaired wire and place it in water, and you can judge whether it is good or bad by seeing whether there is any air leakage.