Plastic embrittlement is a common quality defect in the whole process of plastic extrusion. Its main performance is: the temperature is extremely high; there are a lot of thick smoke and obvious irritating odor at the edge of the engine mold, and there is a popping sound when it is more serious; There are coke particles in the layer; there are continuous bubbles on the glue joint; the key reasons for the injection are:
1. The temperature control is extremely high to achieve the thermal melting temperature of the plastic;
2. The extruder screw has not been cleaned for a long time, and the accumulated embrittlement is extruded with the molten plastic;
3. The temperature rise or shutdown time is too long, so that the plastic in the barrel will dissolve when exposed to heat for a long time;
4. The temperature control instrument panel cannot be controlled or is inaccurate, resulting in high temperature dissolution;
5. The refrigeration system of the extruder is not turned on, causing the cutting and friction of the raw materials to overheat.
Therefore, during the entire extrusion process, check whether everything is normal in the heating and refrigeration system; the setting of the extrusion temperature should be based on the processing technology regulations and the rotation speed ratio of the extruder screw; the effective manipulation of the heating time, Carry out the cleaning of the extrusion molding system software on time.
