Molds & Tooling
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PPS Burning and Gas
Problem Phenomenon
The end of the part is burnt and discolored, mold vent grooves are frequently clogged, and the cleaning cycle is short
Cause Analysis
During high-temperature filling of PPS, air in the cavity is adiabatically compressed and burnt; PPS processing generates many precipitates, making vent grooves prone to clogging; vent depth 5-8/1000mm, width 5mm, and vacuum venting if necessary
Solution
①Vent groove depth 5-8/1000mm, width 5mm; ②Shorten the vent cleaning cycle; ③Evaluate vacuum venting for molds with severe air entrapment; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The PPS venting system must be designed for high-contamination conditions; groove depth precision plus frequent cleaning, and vacuum venting is the ultimate solution; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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