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Expert guides on recycling line design, process optimization, maintenance, and project planning.
Compressed film bales, extruder purge lumps, and full rolls are the three feeds that damage shredders most in plastic recycling. This guide explains how a hydraulic bale cutter works, how much cutting force each material needs, when pre-cutting pays for itself, and how to size a guillotine to your shredder's feed opening.
Density separation sorts mixed plastics by whether they float or sink in a liquid, and it is the cheapest way to split polyolefins from heavier resins. This guide explains how a sink-float tank works, which plastics float and which sink, what density separation can and cannot do, and how it compares with electrostatic and eddy-current sorting.
A reference density chart for common recycling plastics — PP, PE, PET, PVC, PS, ABS, and more — with each resin's density in g/cm³ and whether it floats or sinks in water. Includes how fillers shift density, why some resins overlap, and how recyclers use the chart to sort plastic by sink-float.
Every plastic sorting method works on one physical property — density, weight, surface charge, conductivity, or polymer fingerprint. This guide compares sink-float, air classification, electrostatic, eddy-current, and NIR sorting, shows what each one separates, and gives a decision framework for matching the method to your contamination.
A centrifugal dryer spins washed plastic flake at high speed to throw off free surface water mechanically, before any heat is applied. This guide explains how a centrifugal drying machine works, where it sits in a wash line, the residual moisture it reaches, how to size one for film versus rigid flake, and when you still need a thermal stage after it.
EPS foam is almost all air, so the cost of recycling it is the cost of moving that air. This guide explains why expanded polystyrene is hard to recycle, how cold-press and hot-melt densifiers shrink it 40 to 90 times, what the compacted blocks are worth, and how to choose the right machine for your volume.
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