Both insert mold & over mold belongs to injection mould: some mould need metal parts or other parts to be included in the mould in advance, and be one with the plastic molding process, generally divided into hard plastic bags and soft plastic bags two mould, hard plastic injection mold or Insert mold, the traditional way is to manually into the metal piece, two sets of (a male) after mould (female) before match a set of mould, in recent years, with the development of automation, have been developed for automatic placement and improve the production efficiency of the metal.
Over mold (overflow mold), the general concept is to cover the base plastic or plastic semi-finished plastic with another layer of plastic.