Molds & Tooling
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PSU Anti-drool Dimension Management
Problem Phenomenon
Melt drool and degradation alternate at the PSU hot runner or nozzle; the anti-drool dimension is set improperly; product quality fluctuates.
Cause Analysis
PSU anti-drool dimension should be minimized to prevent excessive thermal degradation, recommended 3 to 8mm; too large anti-drool causes melt retention and thermal degradation; too small causes drool contaminating mold and products.
Solution
①Set the anti-drool dimension at 3 to 8mm; ②Follow the minimization principle to prevent thermal degradation; ③Coordinate nozzle temperature control; ④Regularly inspect hot runner condition.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The 3~8mm for PSU anti-drool is a precise guidance value; the minimization principle protects heat-sensitive materials; hot runner maintenance is daily homework.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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