Molds & Tooling
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PTFE Compression Molding Surface Pattern and Cracks
Problem Phenomenon
Patterns and cracks appear on the surface of PTFE compression molded products, inconsistent between batches, products are scrapped in severe cases, and cracks appear after sintering.
Cause Analysis
Poor resin thermal stability, mixing of different batch numbers, too high preforming pressure, impact-type pressing in the pressing process, and improper mold fit jointly cause it; uneven pressure distribution generates internal stress, which is released as cracks during sintering.
Solution
①Select resin with good thermal stability and use the same batch number; ②Appropriately reduce the preforming pressure; ③Press slowly and uniformly, prohibiting impact-type; ④Improve mold fit and place it at the center of the press table.
Key Takeaway
PTFE compression molding cracks are the superposition of three factors: material, pressure, and mold; uniform and slow pressing is an iron rule of operation; batch number management is often overlooked but is key.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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