Injection Molding
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Warpage of PE Injection Molded Products (Ejection-Induced)
Fenómeno do problema
PE products are deformed by ejection at the moment of ejection and set into permanent warpage after cooling.
Análise das causas
PE cools slowly and has low hot strength; when the product is ejected before it has set, the ejection force causes irreversible plastic deformation; insufficient cooling time, an unbalanced ejection system, and ejector pins pushing on low-rigidity thin-wall areas all significantly amplify this ejection deformation.
Solução
①Extend the cooling time; ②Balance the ejection system and eject at high-rigidity locations; ③Lower the mold temperature to speed up setting; ④Optimize ejector pin layout and area; ⑤Use setting fixtures for deep-cavity thin-wall parts.
Conclusão principal
PE ejection deformation = 'insufficient cooling + uneven ejection': ejecting only after thorough cooling and balanced ejection are the principles; deformation caused by ejection is often misjudged as warpage from uneven cooling — pay attention to the distinction.
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