... material with nitrogen treatment for the scrw ,barrrel ,module head and so on, so there parts can be used with ... main performance of sheet with good plasticizing. For die head ,adopt advanced electric or hyduaulic exchanging device for filtering net, sothe operation ... extruder is composed of 6parts,extruder part ,filter part,die-head part,three rollers part,and traction part, rewinding part.extruder ...