Wire and cable extrusion produces lumps of reasons and phenomena

1. Wire and cable extrusion due to low temperature control, the plastic is not yet plasticized from the head extrusion. Plastic quality is poor, there are difficult to plasticize the resin, these are not fully plasticized on the extrusion. Some impurities are added to the hopper when adding materials in wire and cable production, resulting in impurity lumps. Temperature control is too high, resulting in scorching, which produces scorched lumps. To the mold cover is not pressed, into the rubber after aging and deterioration, appear burnt pimples; resin in the plasticization process of the pimples, in the plastic layer surface there are small crystals and small particles, distributed around the surface of the plastic layer. Scorch bumps, in the plastic layer surface has scorched material, especially reflected in the surface of the glue joints. Impurity pimples, there are impurities on the surface of the plastic, sliced pimples have impurities inside. Poor plasticization of plastic pimples, sliced pimples found inside the cooked rubber. All these reasons and phenomena are important factors that cause pimples in extrusion.2. The following methods can be used to eliminate pimples, the pimples caused by the plastic itself, the temperature should be increased appropriately. Strictly check whether the plastic has debris when adding material, do not add other debris into the hopper when adding material, found that the impurity should immediately clean the head, the screw inside the storage of rubber run net. Found that the temperature is too high to immediately reduce the temperature appropriately, if the effect is not good, to immediately clean the head and screw, exclude burnt material. Therefore, in the production process, a variety of situations may occur, should be carefully in accordance with the method of production, to reduce the number of bad products and waste in the production.

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