Molds & Tooling
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Contamination by Decomposed Material After PSU Shutdown
Problem Phenomenon
When production resumes after PSU shutdown, products show black specks, impurities and abnormal performance; residual decomposed material in the barrel was not completely removed.
Cause Analysis
PSU-type materials are temperature sensitive; residual melt in the barrel decomposes after shutdown; in discontinuous production, the melt retained in the barrel has decomposed, and continuing production without clearing it injects it into the cavity forming impurities.
Solution
①After shutdown, purge the decomposed material from the barrel before '2079851475616104452; ②Clean the barrel promptly; ③It is recommended to clean the barrel with AS, PS, PP and other materials; ④Lower the temperature during long shutdowns.
Key Takeaway
The core of PSU shutdown management is thorough removal of decomposed material; the choice of purging material is particular; the purge amount when resuming production must be sufficient.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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