Molds & Tooling
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Gate Stringing and Sprue Failure of PEEK
Problem Phenomenon
Severe stringing at the PEEK gate, the sprue is difficult to pull out or breaks and remains, automated production is interrupted, and hot runner gate condensation blockage occurs frequently.
Cause Analysis
PEEK has a high melting point and fast heat conduction, so the temperature window in the gate area is extremely narrow; if the temperature is low, the gate freezes early and blocks, if high, stringing and sticking occur; poor thermal coupling design of the hot runner tip aggravates the fluctuation.
Solution
①Precisely control the gate area temperature within the process window; ②Optimize the hot runner tip structure and heating power; ③Adjust the mold opening sequence and valve pin action; ④Appropriately enlarge the cold gate size and provide a sprue-pulling structure.
Key Takeaway
PEEK gate management is the ultimate test of temperature precision; hot runner tip design is more important than temperature setting; gate failures should be fully verified at the mold trial stage before mass production.
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