Molds & Tooling
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PPS Burning and Gas
Problembeschreibung
The end of the part is burnt and discolored, mold vent grooves are frequently clogged, and the cleaning cycle is short
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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