Dryer design achieves constant dewpoint

Nucon has introduced a new dryer design that employs a continuous desiccant wheel that slowly rotates through the process areas. One benefit, explains Rob Miller, vice president, operations with Nucon, is maintenance of a constant -40 C dewpoint because the desiccant moving into the process area is always freshly regenerated.

In addition, Miller says it is possible to provide some adjustable parameters on the dryers to minimize power consumption when the dryer does not need to be operating at full capacity.

The dryers are available in 500, 750, and 1,000 cfm models.

Nucon Systems Inc. 416/213-5556

Superior mixing from mixer/extruder combination

Exceptional processing capabilities is the promise of Farrel’s new Ultima compounder, which combines a two-stage continuous mixer and a single-screw extruder integrated in a unitized frame.

The two-stage mixing rotor geometry permits melting and dispersive mixing in its first stage, and optimization of dispersive and distributive mixing in its independent second stage. Ultima provides extended mixing length and residence time, and an extraordinary polymer processing window.

Applications include mixing of nanocomposites, direct injection of PVC plasticizers and stabilizers, polymer alloying and wood flour compounding.

The counter-rotating mixing employs two-stages and rotor speeds up to 1,000 rpm. The system also has increased horsepower and operating torque. Mixing intensity in the first stage is accomplished by varying the chamber wall clearances between the two stages.

A variable orifice is adjusted in the second stage to allow for increased dispersive mixing, vacuum vented for additional volatiles and moisture removal.

Farrel Corp. 203/735-5500