I want to tell you the Shortcoming of traditional injection molding in water cooling, because traditional water-cooled injection molds are made of steels via the material removal process, their water lines are made with drilling simple, intersecting, straight holes, it will lead to lower heat transfer efficiency, uneven temperature on the cavity surface, and warpage on the plastic part.

for every application, when we choose a molding method for a particular molded part, it must be established individually from technical and economic aspects. For example, in combination injection molding, because the gate interferes during rotation or transfer, the rotary mold systems often employ hot runners for the pre-molding so as to yield a gateless pre-molding.

when a mold is opened, usually we always want the product to be retained on the side of the moving mold, draft of inner surface is always smaller than that of the outer surface, but sometimes, we want the product to be retained on the side of the fixed mold, the draft of the outer surface should be smaller than that of the inner surface.