1. Cable surface scratches: eye mold scratches, replace eye mold promptly
(1) Due to scratches on the wire guide wheel and wire storage rack, identify the problem points in a timely manner and adjust them immediately to solve the problem.
(2) The accumulation of slag in the outer eye can also cause scratches, and fundamentally, the material should be replaced. Secondly, by increasing the extrusion temperature and replacing the outer mold with a slightly smaller aperture (without a corridor section), the problem of scratches caused by slag accumulation in the outer eye can be solved.
2. Eject plastic and burn it
Plastic scorching is a common quality defect in the plastic extrusion process, which is manifested as: excessively high temperature display; There is a large amount of smoke and a strong pungent smell at the die mouth of the machine head, and in severe cases, there is a popping sound; Extruded plastic layer with charred particles; There are continuous bubbles at the adhesive joint; The main reasons for this are:
(1) Control the temperature to reach the thermal degradation temperature of the plastic;
(2) The screw has not been cleaned for a long time, and the accumulated burnt matter is extruded with the molten plastic;
(3) If the heating or shutdown time is too long, the plastic inside the machine barrel will decompose due to long-term heating;
(4) The temperature control instrument loses control or accuracy, causing high-temperature decomposition;
(5) The cooling system of the extruder was not opened, causing material shear friction and overheating.
Therefore, during the production process of the extruder, it is necessary to strengthen the inspection of whether the heating and cooling systems are working properly; The temperature setting of the extruder should be determined based on process requirements and screw speed; Reasonably control the heating time and regularly clean the extrusion system.
3. Uneven outer diameter size
Improper human control, pay attention to abnormal acceleration and deceleration, tension of the pay-off frame and take-up tension, abnormal measurement tools, etc.