... hot runner, there will be many fish eyes in the fitting due to the material crystallization after cooling, the inner tension ... new press-casting (PC) to produce the big diameter HDPE fitting. PC technology is combined with extrusion, injection, hot runner and ... with the diameter less than 1200mm, such as flange, cap, socket, reduced socket, and less than 630mm fittings, such as TEE, elbow, saddle ...