Production & Quality
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Sink Marks on PEEK Orthopedic Implants
Problem Phenomenon
Surface sink marks on PEEK orthopedic implants are out of tolerance; dimensional accuracy and surface quality cannot meet medical standards, and simply adjusting holding pressure gives unstable results.
Cause Analysis
The uneven wall thickness and fine structure of the implant make feeding channels complex; PEEK crystallization shrinkage and the holding window are mutually coupled, and when the holding curve is unreasonable, local feeding is insufficient, forming sink marks.
Solution
①Optimize the injection and holding curves based on Moldflow simulation; ②Use staged holding to match the freezing sequence of each region; ③Control mold temperature in stages to balance crystallization shrinkage; ④Place the gate near the thick-wall functional area.
Key Takeaway
Sink mark treatment for PEEK medical parts requires simulation-driven holding curve design; staged mold temperature control is an effective means for precision medical parts; once the process is fixed, it must be strictly controlled.
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