What is the difference between a plastic granulator and a shredder?
Speed, torque, and the size of what comes out. A shredder's shafts turn at low speed with high torque, ripping large or tangled scrap into coarse strips and chunks. A granulator spins a knife rotor fast against bed knives and cuts smaller, cleaner material into regrind sized by a screen. Bulky or contaminated scrap usually goes through a shredder first, while clean sprues and trim can go straight to a granulator.
What equipment does a plastic film recycling line need?
Post-consumer film typically runs through a shredder, a wet granulator, friction washers, a float-sink tank, and mechanical and thermal dryers. Washed film flake is so light that it then needs a densifier or a cutter compactor to feed the extruder, followed by melt filtration and pelletizing. Clean factory film can often go straight to a cutter compactor line.
Does post-industrial scrap need the same equipment as post-consumer plastic?
Often not. Post-industrial scrap is manufacturing waste such as trim, startup scrap, and off-spec product. It is often clean and single-resin, so a granulator, and sometimes a reclaim extruder and pelletizer, may be enough. Post-consumer plastic is typically mixed, printed, or contaminated, so it needs shredding, washing, sorting, and drying, with finer melt filtration. The actual contamination and resin mix decide the line.
What is a plastic densifier?
A densifier, also called an agglomerator, turns light film and fiber into dense crumbs that an extruder can feed. A fast rotor in a drum heats the material by friction until it softens, and a shot of water then shrinks it into granules. A cutter compactor does similar work but feeds the extruder directly. A foam densifier is a separate machine that compresses expanded polystyrene into blocks.
What should I check on a used recycling pelletizing line?
Start with the run hours, the screw and barrel condition, and the gearbox record. Then look at the filtration: a line with a manual screen changer was likely built for clean feed, while backflush or continuous filters suggest it handled post-consumer material. Check the cutter compactor or densifier rotor and knives, the pelletizer die plate and blades, and the water system.
Can I buy a complete plastic recycling line?
Sometimes. Complete lines come to market when a recycling plant closes, and some sell at auction as a whole plant, from the infeed conveyor to the pellet silo. More often, a line is built from separate machines. Then match each step's capacity to your feedstock and output, and check that the controls, voltage, and conveyors connect.
What should I send to sell a wash line or a whole recycling plant?
Start with a layout or a list of the lines and machines, plus nameplate photos of each major unit. Tell us which lines still run, the rated throughput if you know it, and the run hours on the extruders and shredders. Add the date the site must be clear. Removal costs nothing up front, because we pay for it and deduct it from the sale proceeds.