Definition of Granulator

With that in mind, to understand what a true granulator (or granulating process) is, we need to take into account the definition of the word. Originally, to granulate something was to turn a larger component into a “grain”. Thus the name Granulator was given to any equipment that could take a larger component and reduce it to a grain sized output; perhaps on the level of corn meal or below. Sadly for those who have size reduction needs, the fact that the word has been attached to equipment other than granulators has greatly confused its usage and likely caused many to purchase equipment that simply is not capable of optimal production for a granulation process. Granted, the ability of any machine to produce a specific output is based on the material being reduced, it remains that granulators have a very specific purpose and place that no other machine can compete with.

So, how do we define a Granulator in today’s size reduction market?

Simply put, a Granulator is a high speed, normally open rotor knife mill designed to take larger components of feed stock (such as plastics, bottles, organics, etc…) and reduce them to a particle size of approximately 40 mesh to 1/8 ” chip. And while many granulators are used for processing of material outputs of greater than 1/8”, it still remains that their primary place is in the reduction to the finer grains.

While that may be an overly simplistic definition, it does comprise the most common usage of equipment. And it should also be noted that other styles do exist, such as closed rotor designs, higher production models and really, a multitude of similarly designed rotors, however; even with these options which are often to facilitate differing feed stocks – the output of a granulator still remains close to the same sizing.

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