Molds & Tooling
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PPS Burning and Trapped Gas
Problem Phenomenon
Burnt marks and black spots at the end.
Cause Analysis
Under high-temperature melt, trapped gas adiabatic compression more easily causes burning; poor venting superimposed with high-speed filling.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Open venting grooves at the end; ②reduce injection speed; ③clean venting grooves; ④optimize gate position.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS high-temperature processing has higher trapped gas risk; venting design must be sufficient.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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