What is a Granulator?
Granulators is a machine that can granulate plastic or other specific parts and can come in different sizes and shapes. Unlike crushers, the speed of granulators will run at around 200-800 rpm, which is higher. Heavy-duty blades mount at an angle (often adjustable) in an open, hollow rotor on various dies. When the blades in the fast spinning rotor make contact with the stationary blades in the granulator housing, the feed material is cut into flakes or relatively fine grinds. At the bottom, or around the rotating rotor, is a size screen, a metal screen with holes the size of the desired outlet. The plastic film remains in the cutting chamber until it reaches the desired size, usually between several inches to 1/8 inch, and falls off.
Although plastic granulators offer the unique ability to produce smaller outlets, fast moving parts make granulators very noisy to work with and produce large amounts of dust or fines. Manufacturers of higher quality granulators often offer the option of a soundproof outer casing and methods of reducing dust / fines through the use of additional screens, reduced speeds, vacuums, and wet granulation.
For the purpose of washing the plastic film, most will suggest the use of a wet granulator. Wet granulators work the same way, except that a constant stream of water is sprayed into the cutting chamber. This setting is ideal for most plastic film wash lines because it not only achieves size reduction, but additional water helps clean or "pre-treat" dirty films before it reaches other washing equipment. The added water also acts as a lubricant for the rotating blades to reduce heat and friction, allowing the blades to last much longer before sharpening.
Although plastic granulators offer the unique ability to produce smaller outlets, fast moving parts make granulators very noisy to work with and produce large amounts of dust or fines. Manufacturers of higher quality granulators often offer the option of a soundproof outer casing and methods of reducing dust / fines through the use of additional screens, reduced speeds, vacuums, and wet granulation.
For the purpose of washing the plastic film, most will suggest the use of a wet granulator. Wet granulators work the same way, except that a constant stream of water is sprayed into the cutting chamber. This setting is ideal for most plastic film wash lines because it not only achieves size reduction, but additional water helps clean or "pre-treat" dirty films before it reaches other washing equipment. The added water also acts as a lubricant for the rotating blades to reduce heat and friction, allowing the blades to last much longer before sharpening.
Reference: PRM
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