Molds & Tooling
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PPS mold temperature 130-150℃
Problem Phenomenon
Product surface has no gloss and appears matte and rough, warpage after demolding, heat resistance not up to standard
Cause Analysis
PPS is a crystalline polymer, mold temperature determines crystallinity: crystallinity at 94℃ mold temperature is only about 8%, reaching 48% at 150℃; mold temperature below 120℃ causes rough and glossless product surface, insufficient crystallization, and post-crystallization deformation
Solution
①Mold temperature standard set at 130-150℃; ②when surface requirements are high it must not be lower than 120℃; ③use oil temperature unit plus insulation plate for precise control; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Mold temperature is the switch of PPS crystallinity; 130-150℃ ensures sufficient crystallization, glossy surface and dimensional stability; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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