Ask Yourself These Questions Before You Buy a Granulator
1 WHAT DO YOU WANT TO GRIND?
* Consider: Type of part or sprue/runner system, type of material (hard/soft, brittle/tough, filled/unfilled), and temperature of parts being granulated.
* Determines: Rotor design, horsepower, sound attenuation, and means of regrind removal.
2 WHAT SIZE IS THE PART OR SCRAP?
* Consider: Physical size, shape, and wall thickness of the parts or runners.
* Determines: Feed-hopper and cutting-chamber size and configuration (tangential or horizontal).
3 HOW MUCH DO YOU WANT TO GRANULATE?
* Consider: Desired throughput rate (more important for central grinding, but can be significant when one beside-the-press granulator is to serve several machines processing the same material).
* Determines: Horsepower, rotor design, number of rotating and bed knives, screen size, rotor speed, and means of regrind removal.
4 HOW WILL YOU FEED THE GRANULATOR?
* Consider: Manual batch feeding or metered feed by hand, robot, or conveyor.
* Determines: Feed-hopper design.
5 WHAT WILL YOU DO WITH THE REGRIND?
* Consider: Particle-size requirement and whether it will be reprocessed alone or proportioned with virgin.
* Determines: Quality (uniformity) required, screen size, rotor speed, and evacuation method (e.g., proportional feeding to a hopper loader, blower to storage).
6 WHAT ARE YOUR SPECIAL NEEDS?
* Consider: Location of regrinding, diversity of grinding requirements, cleanliness requirements, control requirements, and safety and noise requirements.
* Determines: Central or beside-the-press installation, special controls, safeties, alarms, level indicators, sound attenuation, portability, and many other options.