A plastic granulator breaks down plastic fragments into small pieces for recycling. There are several parts that go into making a plastic granulator, but perhaps the most important is the knife and the rotors.
The knife on the plastic granulator is usually mounted directly on the rotating rotor, or it’s on a stationary bed. There is a set of knives used to help break down the plastic. The exact space between the knives depends on the type of plastic you are processing and how. For example, if you have hard plastic materials, you’ll want to leave more space between the knives. Knives with a smaller space are better for a cleaner cut on soft plastics.
Knowing which type of knives you need is extremely important in deciding on what plastic granulator to purchase. For example, knives that have blunt tips are used for brittle materials most often. With softer materials, you’ll want knives with sharp edges to get more precision.
The rotor is another essential part of a plastic granulator. There are different types of rotors. For example, an open rotor is used for heat-sensitive resins because it allows for a healthy airflow while the material is being cut. A closed rotor doesn’t provide space between the knives and the shaft. You’d likely use a closed rotor if you need to cut thick materials, because this lack of space allows for more strength in the knives.
Understanding these different elements of a plastic granulator will help you determine which is the best for purchase in plastic processing.