Molds & Tooling
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PTFE Compression Molding Inaccurate Dimensions
Problem Phenomenon
PTFE compression molded products have large external dimension deviations, inconsistent dimensions at different positions in the same mold shot, and assembly fit out of tolerance.
Cause Analysis
Resin molecular weight too small or unevenly distributed; uneven pressure in preforming; uneven feeding without leveling; improper holding pressure, pressure not transmitted to all parts of the resin; the greater the pressure, the longer the holding pressure time required.
Solution
①Select resin with the same batch number and consistent performance; ②Press uniformly and slowly; ③Feed uniformly into the mold sleeve and level off; ④Give corresponding holding pressure time for different pressures, greater pressure means slower pressing and longer holding.
Key Takeaway
PTFE dimensional accuracy depends on the uniformity of pressure transfer; feeding and leveling is a simple but critical action; the matching relationship between pressure and holding pressure time must be followed.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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