Molding Process
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PTFE Compression Molding Rough Surface and White Spots
Fenómeno do problema
The surface of PTFE compression molded products is rough with white spots, the grainy feel is obvious, and both appearance and sealing performance are affected.
Análise das causas
Too low preforming pressure makes the bonding between powder particles not tight; insufficient holding pressure time makes pressure transfer insufficient; when the resin particle size is too large beyond the 25~200μm range, the particle gaps cannot be completely eliminated.
Solução
①Increase the preforming pressure per unit area; ②Maintain sufficient holding pressure time to allow full pressure transfer; ③Select resin with an average particle size of 25~200μm; ④Load uniformly to avoid local looseness.
Conclusão principal
PTFE white spots and roughness are direct evidence of insufficient compaction; particle size specification is a key point of raw material acceptance; holding pressure time is as important as pressure.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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