Molds & Tooling
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PEI Cooling Time Management
Problem Phenomenon
PEI high mold temperature processes have long cooling time and low efficiency; shortening cooling causes product deformation; cooling and cycle time conflict.
Cause Analysis
PEI mold temperature is high, so cooling time needs to be long enough to ensure no deformation after demolding; conventionally 20~60 seconds, thick walls 60~120 seconds, cooling to below Tg at about 200℃; too fast increases internal stress, too slow reduces efficiency.
Solution
①Cooling time in the range of 20~120 seconds according to wall thickness; ②extend thick-walled parts to 60~120 seconds; ③optimize cooling water circuits to improve efficiency; ④verify with dual indicators of deformation and stress.
Key Takeaway
PEI cooling time has clear range guidance; demolding below Tg is the principle; water circuit optimization is the way out for efficiency.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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