Material Analysis
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PSU Decomposition Due to Excessive Melt Temperature
Problem Phenomenon
PSU products show flow splash marks, bubbles and surface impurities; the material carbonizes, color turns yellow, and performance declines significantly.
Cause Analysis
After PSU melt temperature exceeds 330°C, viscosity drops by 50% for every 30°C increase; the price of improved flowability is a sharp increase in thermal decomposition risk; loss of temperature control carbonizes the material; the temperature upper limit of PPSU-type materials is ≤400°C.
Solution
①Control barrel temperature within the reasonable range of 280~330°C; ②Verify section by section that the error between actual and set temperature is ≤±5°C; ③Lower the temperature and clean the machine promptly after overheating; ④Set temperature by balancing flowability and stability.
Key Takeaway
The double-edged sword nature of PSU temperature management is distinct; the sharp viscosity drop near 330°C is both an opportunity and a trap; ±5°C temperature control accuracy is a hard requirement.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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