Injection Molding
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PEEK Flash
Problem Phenomenon
Flake-like flash appears at the parting line, ejector pin holes, and slide fits of PEEK products; the flash of glass fiber reinforced grades is hard and brittle and difficult to remove, and trimming easily damages the product.
Cause Analysis
PEEK has high injection pressure, and the melt is squeezed in when the clamping force is insufficient or gaps appear due to wear of the mold parting line; the mold works long-term at high temperature, and platen deformation and fit wear accelerate gap formation.
Solution
①Check and increase the clamping force, calculated by projected area and cavity pressure; ②Overhaul the parting line to restore fitting precision; ③Appropriately reduce injection pressure and holding pressure; ④Check the thermal expansion fit of the mold at high temperature.
Key Takeaway
PEEK's high injection pressure places higher demands on clamping and mold rigidity; recurring flash mostly stems from mold wear rather than parameters; the mold maintenance cycle for high-temperature working conditions should be shortened.
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