today you ask me some things about the structure of two-colored mold, yes! Now I have a project like this at hand. Actually, the key of that kind of structure requires special mold techniques, during two-component combination injection molding, two melts are introduced into the cavity in succession via separate gating system. When the first material is injected, the second melt must be blocked off. The rotating mold systems and the non rotating core-back systems are their separation methods.