Molds & Tooling
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ABS mold sticking (difficult demolding)
Problem Phenomenon
The product adheres to the cavity or core, and is pulled injured, ejected white, or even punctured during demolding, affecting the tempo and appearance.
Cause Analysis
Too high holding pressure and too high melt/mold temperature make the product's gripping force large; insufficient draft angle; poor cavity polishing or roughening; deep cavity vacuum adsorption effect—all significantly increase the demolding resistance.
Solution
①Reduce holding pressure and melt temperature; ②ensure a draft angle of 1°~3°; ③polish the cavity to repair pull injuries; ④fully cool before mold opening; ⑤add air intake/venting for deep cavity parts to avoid vacuum adsorption.
Key Takeaway
For ABS mold sticking, first 'reduce pressure and temperature', then 'repair the draft angle and polishing', and finally deal with vacuum adsorption; the polishing quality along the demolding direction often affects the demolding feel more than the draft angle.
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