Randomized trial investigates demolding forces in ceramic molding, suggesting surface finish impacts efficiency.
Ceramic injection molding is a net-shape manufacturing process to mass-produce ceramic components. During demolding adhesive forces act between the ejected green body and the mold surface. Hence demolding is essential to obtain defect-free and non-distorted components. Influencing factors on ejection forces are not yet investigated in detail or quantified for ceramic injection molding. This study investigates demolding forces during injection molding of two Al₂O₃-based feedstocks with different binder systems and the influence of mold surface finish and mold temperature. Demolding forces were measured in an instrumentalized molding tool. Different steel inserts with ground, electric discharge machined and polished surfaces were used and mold temperature was varied. Surfaces of green bodies and sintered parts were analyzed. Results show that rougher mold surfaces can significantly reduce demolding forces and that demolding forces are governed by a complex interaction between mold surface finish, mold temperature and the binder system.
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Veit et al. (2026) studied this question.
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