Molding Process
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PTFE Cold Flow Creep
Fenómeno do problema
PTFE seals and bearings plastically deform after long-term use, seals fail with increased clearance, and dimensions are unstable.
Análise das causas
PTFE under long-term pressure undergoes cold flow (creep); pure PTFE has low mechanical strength and weak creep resistance; the three factors of load, temperature, and time accumulate; sealing compression force makes the material flow slowly.
Solução
①Fill with glass fiber, graphite, bronze, etc. for modification to enhance creep resistance; ②Structural design to reduce local stress concentration; ③Consider creep compensation in seal structure; ④Regular inspection and replacement plan.
Conclusão principal
PTFE cold flow is an inherent weakness of the pure resin; filled modification is the standard countermeasure; seal design must reserve creep compensation.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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