Common problems and solutions in cable production

Cable production of common problems and solutions 1, crosslinking degree (thermal extension) unqualified crosslinking degree is not up to standard, the cable thermal - mechanical properties are not qualified, can not meet the requirements of the operating temperature of 90 ℃. Crosslinking degree of unqualified reasons, one is the formula is unqualified, with the type of agent ratio is not appropriate, should be adjusted to solve the formula; Second, improper vulcanization process, such as air pressure is too low, line speed, cooling water level and other factors, the solution is to first find out what is the reason, it may be a kind of, it may be a number of reasons at the same time, for the reasons to be ruled out.

2, structure and appearance unqualified (a) the thinnest point of the insulation thickness is lower than the minimum value specified in the standard, or the average thickness is lower than the nominal value. Insulation thickness is unqualified because of the line speed, the extruder is small amount of glue, mold selection and so on. The solution is to reduce the line speed or extruder speed, adjust the size of the mold. (B) Eccentricity Eccentricity is generated because the mold is not adjusted or raised after adjusting the suspension degree control changes, the solution is to drive the process as far as possible will be hanging degree control stability. 3, bamboo-like cable outside the bamboo-like reasons are electrical, mechanical system causes traction speed instability, the second is the mold core is too small, or the conductor outside diameter is not uniform. Elimination method is to check the mechanical and electrical systems, troubleshooting. Appropriate adjustments to the size of the core, control the outer diameter of the suburb as uniform as possible, more than the process specified stranded wire can be used. 4, surface scratches (a) cable in the vulcanized tube touches the upper and lower walls or foreign objects. Therefore, it is required to adjust the degree of suspension, try to make the core of the cable in the middle of the crosslinking tube to move, found foreign objects, clean up in time. (ii) There is burnt material on the outer edge of the mold cover. The solution is to adjust the temperature of the die set when starting the car to prevent overheating, once found burnt, should immediately stop the car to remove, or will not become better on its own. 5, impurities Insulation and semi-insulation material in the majority of the impurities are in the mixing and extruder charging process brought in. Operation process should pay strict attention to the cleanliness of the material to prevent outside impurities mixed. Another impurity is burnt pimples, its presence affects the performance and service life of the cable, so in the mixing and extrusion of strict temperature control, to prevent the occurrence of burnt phenomenon. 6, bubbles Insulation bubbles may have two reasons. One is caused during extrusion. The solution is to select the appropriate mold. Shielding layer has bubbles, the main reason is that there is moisture in the material, should be dried before extrusion, and the second is not sufficient cooling, which will appear as follows, a circle of bubbles on the circumference equidistant from the core. Eliminate the method is to strengthen the cooling, rise the water level and reduce the temperature of the cooling water.

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