The invention aims to provide a blow molding process for automotive expansion water tanks, which adopts a blow molding machine and an extruder. The process steps include equipment preheating, parison extrusion and preforming, vacuum-assisted parison blowing, cooling and shaping, mold opening and product demolding. By optimizing the traditional process and adding preheating before blowing as well as air cooling during demolding, the present invention improves overall molding quality, enhances the wall thickness uniformity of products, reduces material waste and cuts production costs.
Area Code: CN
Application Number: CN201610292728.5
