Failure Analysis: > Aside from normal wear and tear, screw breakage typically results from forcefully starting the machine with insufficient preheating. This practice subjects the screw to excessive torque during startup, leading to the formation of micro-cracks. Over time, the accumulation of internal stress leads to fatigue failure and eventual breakage.
Operating Recommendations: > To ensure thorough plasticization and to protect the screw, it is recommended to set the temperature of all zones 20°C higher than the target production temperature during startup. Once the parison flows smoothly and operation stabilizes, adjust the temperatures back to the standard production values. This procedure effectively reduces startup resistance and eliminates the risk of breakage.