... , no binder 4.zero draf V-process molding is a new type special casting technics, and adopts single dry ... 10 ten-thousand Vacuum airproof molding line that is the biggest line in the homeland.Vacuum airproof molding ... have the excellence of high automatic, high quality of casting, high precision, cleanse, save energy, improve work surrounding ... make 3000t/year--80000t/year Sand process production line