Large Runner Mold Base:

Also known as a two-plate mold, the large runner mold base features the simplest mold structure. It consists of moving and fixed mold halves. The moving half includes an ejection plate to push out molded parts. Runners are distributed along the parting surface, and after mold opening, the solidified runner material automatically detaches from the fixed mold. Its advantages lie in its simple structure and low manufacturing cost, making it suitable for molding small, simple-shaped products. For small plastic parts like charger heads, the large runner mold base serves as a cost-effective option.

Fine Runner Mold Base:

Also referred to as a three-plate mold, the fine runner mold base has a three-plate structure, incorporating an additional stripping plate compared to the large runner mold base. It includes independent runners and a sprue bushing. Runners and gates are not located on the parting surface, usually requiring manual removal of the runner system before the solidified material can be automatically detached. It represents a more advanced mold design with larger gates. The fine runner mold base offers flexible gate positioning, supports multi-point gating, allows for larger cross-sections, reduces flow resistance, facilitates easier filling, minimizes part deformation, and ensures higher molding quality. For charger heads requiring higher precision or with more complex structures, the fine runner mold base is a preferable choice.