Ancillary Equipment
A dry purification system using high-voltage fields to split mixed plastics like PVC/PET, PE/PP, and ABS/PS with 99%+ purity.
A practical four-step process focused on stable operation and consistent output.
Dry flake (2–10 mm, below 0.5% moisture) is metered onto the unit in a thin, even layer. Consistent size and dryness are what make a stable surface charge possible.
As the flake tumbles through the charging stage, the two polymers rub against each other and the chamber walls and pick up opposite surface charges — one positive, one negative.
The charged flake then falls through a high-voltage electrode field. Positively and negatively charged particles bend toward opposite electrodes, splitting into separate trajectories.
An adjustable splitter divides the streams into product, middling and reject bins. The middling fraction can be re-fed to push final purity higher.
No water, detergents or heat — only electrostatic force. That means no wastewater to treat, no drying step afterward, and a low energy cost per ton.
High-voltage separation drives residual PVC in PET below 50 ppm, the threshold for food-grade rPET pricing. It removes the contaminant that washing and optical sorting leave behind.
Separation is by surface charge, not color or NIR reflectance, so it handles dark and carbon-filled plastics that optical sorters cannot see at all.
ABS/PS and PE/PP have densities too close for a sink-float tank, but they charge differently and separate cleanly here — the polishing step a density line cannot do.
Unstable feedstock conditions reduce production consistency.
Engineering configuration is matched to material variability and throughput targets.
Inconsistent quality creates downstream process risk.
Process design focuses on output stability for downstream stages.
Frequent intervention increases labor and maintenance pressure.
Service-friendly structure supports efficient operation and maintenance.
Scaling capacity can disrupt existing line performance.
Modular integration supports phased expansion and retrofit planning.
Electrostatic separation is a dry polishing stage. It belongs after washing and drying, on size-classified flake, once density sorting has split the bulk resin types — it makes the final single-resin cut that density and optical sorting cannot.
Dry flake is tribo-charged as it tumbles — different polymers pick up opposite surface charges — then fed into a high-voltage electrode field where oppositely charged particles deflect to separate collection bins. No water, no heat, no chemicals.
A typical line runs: shredder → wash → dry → sink-float density sort → electrostatic separator → pelletizer. The electrostatic stage takes a binary or near-binary fraction and lifts it to single-resin purity. Feed must be dry (<0.5% moisture) and size-classified.
View the machine workflow under real operating conditions.
Removes residual PVC from washed PET flakes for bottle-to-bottle extrusion.
Splits mixed rigid packaging where density differences are too small.
Separates the near-overlapping ABS/PS pair from shredded appliance and WEEE plastics, where density sorting fails.
Sorts dark, carbon-filled plastics that NIR optical sorters cannot see, using surface charge instead of color.
Recovers metal particles from cable jacket regrind in a dry process.
After a sink-float stage where PE and PP both float together, electrostatic separation splits the polyolefin fraction density alone cannot.
| Parameter | Specification | Notes |
|---|---|---|
| ES-600 | 300-600 kg/h | PVC/PET, ABS/PS |
| ES-1000 | 600-1000 kg/h | PE/PP and mixed rigid flakes |
Final purity depends on moisture, particle size, and material pair.
These inputs let us recommend the stage count, electrode configuration, and a realistic purity target.
Which two plastics to split (PVC/PET, PE/PP, ABS/PS) and which one is the contaminant to remove.
Contaminant level in the feed now and the purity your buyer requires — e.g. PVC-in-PET below 50 ppm.
Moisture (must be <0.5%) and flake size range (2–10 mm), plus whether washing and drying are already in place.
Average and peak kg/h plus hours per day, to size between the ES-600 and ES-1000.
What precedes the separator — washing, drying, density sorting — since electrostatic is a polishing step, not a primary sort.
A few kilograms of real feed lets us test the achievable purity and quote against a measured result.
| Criteria | Conventional Setup | Rumtoo Solution |
|---|---|---|
| Process Stability | More fluctuation under feed variation | Designed for stable operation across variable feedstock |
| Output Consistency | Higher variation in downstream quality | Process control focused on consistent output |
| Integration | Higher retrofit complexity | Practical integration with existing lines |
| Lifecycle Support | Limited startup optimization support | Engineering support from planning to commissioning |
A machine using high-voltage fields to split plastics based on the surface charge each polymer picks up when tribo-charged.
Yes, typically below 0.5% moisture. Surface moisture bleeds away the electrostatic charge and collapses the separation, so the material must be washed and dried first.
Yes. ABS and PS have nearly identical densities so a sink-float tank cannot split them, but they charge oppositely and separate well electrostatically on dry, size-classified feed.
Yes. Separation is by surface charge, not color or NIR reflectance, so it handles dark and carbon-filled plastics that optical sorters cannot see.
They are complementary. Density sorting splits the bulk resin types; the electrostatic stage then polishes a binary fraction to single-resin purity — for example separating PE from PP, which both float. Dry the material between the wet tank and the electrostatic stage.
On dry, size-classified binary feed, 99%+ purity is achievable, and PVC-in-PET can reach below 50 ppm for food-grade rPET. Actual results depend on the polymer pair, moisture and particle size, so we test your material first.
Share your material type, expected throughput, and project location for a tailored proposal.