Molds & Tooling
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Glass Fiber Friction Shear Overheating of PEEK
Problem Phenomenon
Signs of local overheating and degradation appear during processing of glass fiber reinforced PEEK, with uneven product color and increasing black specks, while the barrel set temperature has not exceeded the limit.
Cause Analysis
High friction between glass fibers and the screw, barrel, and gate generates additional shear heat, making the actual melt temperature higher than the set value; the higher the fiber content and the faster the screw speed, the more significant the shear heating.
Solution
①Reduce screw speed and back pressure to control shear heat input; ②Appropriately lower the barrel set temperature to compensate for friction heat; ③Use the actually measured melt temperature to guide the process rather than the displayed temperature; ④Optimize the gate to avoid high shear at small gates.
Key Takeaway
The temperature management of glass fiber reinforced PEEK must account for the shear heat contribution; the actually measured melt temperature is the only true basis; friction heating scales up in step with fiber content and screw speed.
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