... , no binder 4.zero draf V-process molding is a new type special casting technics, and adopts ... dry sand (no water, binder, tagger), then it is hot up, molding, pressurized sand-box, take out ... thousand Vacuum airproof molding line that is the biggest line in the homeland.Vacuum airproof molding is made up of: ... to stripping 4. high precision5. the cast sand is not bonded , and the sand could be almost ...