1.Surface layer percentage can be as low as 8% 2.Suitable for different melt point raw material co - extrusion,the max temperature difference can reach 80 (Esoecially suitable for process temperatures differ by more than 20 multilayer coextrusion ) 3.Independent temperature control in every layer ,with heat insulation device. 4.With special flow channel design to reduce the edge cutting ,thus to reduce the scraps .