Injection Molding
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Warpage of HDPE '2079851475616104452 (Orientation Type)
Fenómeno del problema
HDPE injection molded parts warp in a fixed direction; adjusting cooling unevenness yields little effect, and it recurs even though it is unrelated to fiber orientation.
Análisis de la causa
HDPE has high crystallinity and strong shrinkage directionality; molecular chains orient along the flow direction, making the flow/transverse shrinkage difference obvious; the gate position determines the orientation pattern, so the warpage direction is stable and highly repeatable.
Solución
①Adjust the gate position to change the material flow direction and orientation; ②Use CAE to analyze filling and orientation; ③Balance holding pressure and cooling; ④Optimize wall thickness and structural symmetry; ⑤Switch to a low-warpage grade if necessary.
Conclusión clave
HDPE orientation-type warpage must be solved through gate and orientation analysis, rather than forcibly suppressing it with cooling; once the warpage direction of a highly crystalline material is fixed, it is time to go back and review the gate design.
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