The photo above is SJ45 single screw extruder, it is used for PP-R pipe line, another is sj25 marking machine. 1.L/D:25:1 2. hard tooth gear wheel box, model:133; speed ratio:11:1 3.drive power:15kw;frequency contro: Danfoss Holip 4.heating ring power:3kw*4 units, air-cool constant temperature; cast aluminum heating ring,stainless steel out shell. 5.Electric machine: Simenz