The longer liquid addition time produces a more uniform distribution of granulating liquid.
Also, the longer granulating liquid addition rate allows for a slower, controlled granulation growth resulting in a tighter particle size distribution.
This slower approach can provide a more robust granulating process with less variability.
Where granulating is required, one route is to use the services of a custom or trade processor.
These points are not intended as criticisms of custom granulating, which is often performed to the highest quality standards.
Vecoplan Maschinenfabrik GmbH of Germany, represented by Nordfab Systems Inc., Thomasville, N.C., introduced a single-rotor, low-speed Vortex unit that combines shredding and granulating
of large scrap like pipe in one step.
Ten or 15 years ago, scrap granulating wasn't considered high technology.
All these factors help determine the most appropriate granulating machine size, feed-throat and cutting-chamber design, rotor and knife configuration, rotor speed, drive horsepower, screen size, and granulate take-away system.
A variety of shredders can reduce large molded parts and purgings to granulating size.
Operating at high rpm, units have an initial chipping knife stage using a solid rotor that feeds chips or shavings into a second stage for conventional granulating. Units come with one or two motors.
In turn, that feeds a Herbold SMS 80/120 machine designed for wet granulating
. Water may be fed over the rotor knives, so as to wash material as it chops.
Company features a dozen different model series to meet every conceivable granulating application.
Operating at high rpm, these units have an initial chipping knife stage using a solid rotor that feeds chips or shavings into a second stage for conventional granulating. Units come with one or two motors.
Eventually, Phillips hopes to be able to process mixed detergent bottles, using a combination of automatic color sorting of whole bottles before granulating
and color sorting of chopped flake as a last quality check just before the extruder.
Also offered are heavy-duty granulating
systems for reclaiming extrusions, fiber and film scrap.