... Double stage extrusion unit 1.materials:PP,HDPE,LDPE,LLDPE,TPV,EVA,ABS and PS,etc. 2.CE certificate Double stage ... extrusion unit :The first stage is closely intermeshing co-rotating twin ... and dispersed well without the pressure.The second stage is single screw.excellent dispersed materials come ... ,shield material,carbon black etc. Double stage extrusion unit