Fractional-lobe EPZ Steer has upgraded its fractional-lobe extruder-processing-zone (EPZ) screw for its Omega line of twin-screw extruders. The improvements are designed for compounding resins containing mica and other delicate additives that are used in special-effects pigments.
What's new? Special, task-specific mixing elements (inset photo) with a fully intermeshing profile and special metallurgy. The screw's deep root depth of 1.71mm draws resin away from the shear forces that occur when the melt contacts the barrel wall. Steer introduced the updated fractional-geometry screw design in July.
Benefits Safe processing of fragile pigments. The mixing elements prevent stagnation, degradation and char formation, yet allow high-volume processing at high specific torque.
Steer America, Uniontown, Ohio, 866-984-1800, www.steerworld.com
