Production & Quality
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PTFE Pre-pressing Insufficient Degassing
Problem Phenomenon
Air is not fully removed in the PTFE pre-pressing stage, internal pores remain after final pressing, and appear after sintering.
Cause Analysis
The degassing function of pre-pressing pressure 5~10MPa and holding 1~2 minutes is not fully exerted; too fast pressing speed leaves no time for air to escape; powder stacking entrains air.
Solution
①Press slowly in the pre-pressing stage to fully degas; ②Sufficient holding time; ③Moderately loose loading to avoid over-tight air entrainment; ④Inspection after pre-pressing.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
PTFE pre-pressing degassing is the premise of final pressing quality; slow pressing is the operation point; air entrainment prevention starts from loading.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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