At ASG Recycling, we offer a variety of plastic granulators based on your applications which will directly affect the cutting chamber design and knife arrangement. Typically, we offer three mainstream types of granulators for your consideration:
- Double Angle Cut: Sometimes referred to as a “double scissor cut” granulator, double angle cutting granulators are most the most common and is recommended by most manufacturers. In this type of cutting array, straight rotor and bed knives are used and mounted at slightly opposing angles slanted at several degrees from being horizontal. This accomplishes several things:
- Constant gap along the full length of the blades.
- Minimal energy consumption.
- Less friction resulting in lower heat build-up.
- Considered to be a “true scissor cut”.
- Produces less fines, lower noise, and higher capacities.
- Chevron Cut: Sometime referred to as “V-type” rotor cutting, rotor and bed knives of chevron style granulators are V-shaped where the cutting edge is located on the interior of the “V”. As the rotor and bed knives come together, the cutting edge starts at the outer edges and conforms into a single point. Although not as popular as double angle cut granulators, chevron cut granulators have a fairly strong fan base. The argument is that while double angle granulators work great in ideal situations, that is, when the knives are sharp, however, as the knives dull, materials tend to be pushed to one side within the cutting chamber. This will lead to uneven wear, increased friction and heat, larger energy consumption, and more fines. This issue is resolved in V-shaped granulators as even when the knives dull, the material within will be squeezed toward the center.
- Helical Cut: Unlike the other designs mentioned earlier, helical rotor granulators have a closed rotor design making it very robust and ideal for high impact loads – that is, thicker materials such as injection or extrusion plastic scrap. The rotor knives are arranged in a helix or spiral design while straight bed knives are mounted horizontally.