Granulator Rotors

Plastics Granulator Rotor

Plastic Granulator Rotor Image by Cumberland PlasticsRotors hold the rotating knives that drive material into the cutting zone between the rotating and mating stationary knives mounted on the granulator bed. The four main types of rotors are open, closed or solid, staggered, and staggered/segmented. Open rotors are good for granulating heat-sensitive resins or feedstocks that are still warm from processing. Closed or solid rotors provide a much stronger knife mounting arrangement to cut through the thickest feedstocks. Staggered rotors are excellent for cutting most heavy, thick-walled parts.

There are a number of rotors from which to choose. Here are the pros and cons of each:

3-Knife Rotor

3 Knife Rotor Image by Cumberland PlasticsGood for general purpose applications.

Advantage:
Able to handle a variety of applications including larger parts with overall low risk.

Disadvantage:
May not be the most efficient choice in some applications that benefit from a more specialized rotor design.

3-Knife Staggered Rotor

3 Knife Staggered Rotor Image by Cumberland PlasticsFor special applications.

Advantage:
Able to handle thicker cross sections by nibbling at the part and allows horsepower to be applied to smaller section of the rotor for higher efficiency.

Disadvantage:
Can lose bite and create bounce on larger parts and is more expensive for routine maintenance parts.

5-Knife Rotor

5 Knife Rotor Image by Cumberland PlasticsFor special applications.

Advantage:
With more cuts per revolution is able to handle thicker cross sections at higher throughput rates.

Disadvantage:
Can lose bite and create bounce on larger parts and more expensive for routine parts.

7-Knife Rotor

7 Knife Rotor Image by Cumberland PlasticsFor special applications.

Advantage:
Able to handle thicker cross sections and higher throughputs. Good for film, fiber and other applications that do not require ingestion.

Disadvantage:
Can lose bite and create bounce on larger parts and more is expensive for routine maintenance parts.

12-Knife Rotor

12 Knife Rotor Image by Cumberland PlasticsFor special applications.

Advantage:
Able to handle thicker cross sections and higher throughputs. Good for film, fiber and other applications that do not require ingestion.

Disadvantage:
Can lose bite and create bounce on larger parts and is more expensive for routine parts.

15-Knife Hog Rotor

15 Knife Hog Rotor Image by Cumberland PlasticsFor special applications.

Advantage:
Able to handle thicker cross sections by nibbling at the part and allows horsepower to be applied to smaller section of the rotor for higher efficiency. Solid rotor adds inertia to the cutting system.

Disadvantage:
Can lose bite and create bounce on larger parts and is more expensive for routine maintenance parts. Solid rotor has less airflow and not suited to high temperature applications.

30-Knife Hog Rotor

30 Knife Hog Rotor Image by Cumberland PlasticsFor special applications.

Advantage:
Ideal for purgings and other tough applications. Able to handle thicker cross sections by nibbling at the part and allows horsepower to be applied to smaller section of the rotor for higher efficiency. Solid rotor adds inertia to the cutting system.

Disadvantage:
Can lose bite and create bounce on larger parts and is more expensive for routine maintenance parts. Solid rotor has less airflow and not suited to high temperature applications.

Typical rotor options include:

Water Cooling – Used in high-temperature applications, water cooling protects the rotor bearings from overheating and helps to reduce heat buildup in the cutting chamber.

Dual Flywheel – A second flywheel increases the inertia of the cutting system which reduces the required horsepower to process materials and conserves energy.

Rotor Knife Carriers – Knife carriers add strength to the knives and, by increasing the mass of rotor assembly, increase the inertia of the cutting system.

Hardfacing – Applying Stellite wire to the leading edge of the rotor and chamber increases surface hardness to make the cutting system more wear-resistant.

Delivering the right Cumberland part for your application.

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