the barral and screw of the extruder adopt the high-grad alloy steel that are processed precisely and go through nitridation treatment, so they are most  outstandingly grind-resistent,erosion-resistant as well as exact and reliable. it also possesses the characteristic of automatic constant temperature controlling system, multi point control, highly controllying accuracy. auxuliary machine installs platform balustrade worktable,so it can be operate easily and safely. roll-up machine adopts multi-roller friction wind-up stracture.