Injection Molding
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Warpage of PE Injection Molded Products (Ejection-Induced)
Problembeschreibung
PE products are deformed by ejection at the moment of ejection and set into permanent warpage after cooling.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
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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