Description Overview Nrm pm70 air cooled extruder 3 1/2” barrel diameter 24:1 l/d ratio General purpose screw Specifications Gear ratio 17.4:1 at 100 rpm 75 h.p. d.c. motor and drive Recent Upgrades New cast fin heaters and blowers installed 2 years ago New rkc dual display controllers and new relays just installed