1
Identificare la frazione leggera da rimuovere
Definire se il contaminante target sono etichette di carta, frammenti di film PE/PP, fibre, polvere o un mix.
Attrezzature Ausiliarie
Classificatore ad Aria Zig-Zag per Separazione Frazioni Leggere nel Riciclo Plastica
Un classificatore ad aria zig-zag utilizza una colonna d aria ascendente con piu stadi angolari per separare materiali leggeri — etichette, frammenti di film, polvere e fini — dai fiocchi o granuli plastici piu pesanti. Rumtoo aiuta a dimensionare il classificatore in base al mix reale di materiale, alla purezza target e alla portata della linea.
Come Scegliere un Classificatore ad Aria Zig-Zag
Il classificatore deve essere adattato alla differenza di densita, alla gamma dimensionale delle particelle e alla portata della linea.
2
Adattare la geometria del canale alla dimensione del materiale
Il numero di stadi zig-zag, la larghezza del canale e l angolo dei deflettori devono adattarsi alla gamma dimensionale dei fiocchi.
3
Regolare il volume d aria per il punto di taglio
Il ventilatore viene regolato in modo che la velocita dell aria sollevi i contaminanti piu leggeri della soglia target lasciando cadere il materiale pulito.
4
Integrare ciclone e raccolta polvere
La frazione leggera trasportata in alto deve essere catturata da un separatore ciclone e filtro a maniche opzionale.
What Buyers Actually Need From an Air Classifier
The zig-zag design is chosen when a recycling line needs a dry, density-based separation stage that handles moderate throughput with high purity in a small footprint.
Effective Label and Film Removal
The multi-stage zig-zag column reliably separates paper labels, thin film scraps, and lightweight contaminants from heavier PET, HDPE, or PP flakes.
Adjustable Separation Sharpness
Air volume and feed rate can be fine-tuned to shift the light/heavy cut point, allowing the same machine to handle different material mixes without mechanical changes.
Compact Vertical Footprint
The vertical column design uses much less floor space than horizontal air tables or vibrating density separators while delivering comparable separation performance.
Common Air Classification Problems
Most issues arise from incorrect air volume, wrong placement in the line, or ignoring the moisture condition of the feed material.
Problem
Rumtoo Solution
Labels and film fragments still appear in the clean flake output.
Rumtoo reviews the particle size distribution and adjusts the number of zig-zag stages and air velocity to improve the separation of near-density contaminants.
Problem
Rumtoo Solution
Too many good flakes are carried out with the light fraction, reducing yield.
Rumtoo tunes air volume and feed rate together so the cut point sits between the contaminant density and the product density, minimizing flake loss.
Problem
Rumtoo Solution
Wet or damp material clogs the zig-zag channel and disrupts separation.
Rumtoo places the classifier after the drying stage and verifies the inlet moisture is low enough for reliable aerodynamic separation.
Problem
Rumtoo Solution
Dust emission around the classifier discharge area.
Rumtoo integrates a cyclone separator and optional bag filter on the light-fraction outlet for enclosed, zero-emission operation.
Machine and Separation Principle Reference
The zig-zag channel creates multiple separation stages where rising air lifts light fractions while heavy flakes fall through gravity.
Machine View: vertical zig-zag column with controlled airflow
The classifier feeds material into a vertical column with angled baffles that create turbulence zones. A blower generates upward airflow, carrying light contaminants to a top cyclone while clean heavy flakes discharge at the bottom.
- Multiple zig-zag stages increase separation sharpness
- Adjustable air volume fine-tunes the light/heavy cut point
- Compact vertical footprint compared to horizontal air tables
Process View: separating light contaminants from heavy PET bottle flakes
In a typical washing line, the air classifier sits after drying or after granulation. It separates residual paper labels, thin film scraps, fiber, and dust from heavier PET bottle flakes, ensuring the final output meets purity requirements for extrusion or premium flake sale.
- Particularly effective after label removers and dryers
- Reduces contamination before extrusion or flake packing
- Can be paired with cyclone and dust collection for zero-emission operation
Zig-Zag Air Classifier Demo
See how the zig-zag air column separates light contaminants from heavy plastic flakes in a working recycling line.
Typical Air Classifier Use Cases
Zig-zag air classifiers are used wherever a dry density-based separation step is needed to remove lightweight contaminants from recycled plastic streams.
PET Bottle Flake Cleaning
Removes residual paper labels, cap liner film, and dust from washed and dried PET flakes before extrusion or sale as clean flake.
HDPE/PP Flake Purification
Separates film scraps, label fragments, and fines from rigid HDPE or PP regrind after crushing and washing.
Post-Shredder Light Fraction Removal
Removes film, paper, and fiber contaminants from mixed shredded streams before further sorting or pelletizing.
Label Separator Complement
Works in series with hot-wash or friction label removers to catch any remaining label material after the primary separation stage.
Pre-Extrusion Quality Gate
Final dry cleaning step before the extruder to reduce contamination-related pressure variation and pellet defects.
Mixed Plastic Sorting Aid
Assists with removing lightweight foreign materials from mixed rigid plastic streams before NIR or sink-float sorting.
Reference Configurations
These are planning references. Actual separation performance depends on material type, particle size, moisture content, and the upstream process.
| Model | Channel Width | Throughput Range | Key Features |
|---|---|---|---|
| RT-ZZ300 | 300 mm | 300–500 kg/h | Compact, 4-stage zig-zag, ideal for small washing lines |
| RT-ZZ500 | 500 mm | 500–1000 kg/h | 6-stage zig-zag, adjustable baffles, standard cyclone |
| RT-ZZ800 | 800 mm | 1000–2000 kg/h | 8-stage zig-zag, heavy-duty blower, dust collection ready |
| RT-ZZ1000 | 1000 mm | 2000–3000 kg/h | 10-stage, dual-inlet option, high-capacity recycling lines |
Throughput depends on bulk density, particle size, and target purity. Rumtoo will confirm the right model after reviewing your material data.
Air Classifier Checklist Before RFQ
These inputs help size the zig-zag column and blower correctly for your line.
Material Type and Contaminant
State the main plastic type (PET, HDPE, PP, mixed) and the light contaminant to be removed (labels, film, dust, fiber).
Particle Size Range
Share the flake or granule size after the upstream crusher, granulator, or dryer — this determines channel geometry.
Throughput Requirement
Provide the target kg/h and any peak-hour variation so the blower and feed system are sized with margin.
Moisture and Line Position
Confirm whether the classifier will sit after a dryer (preferred) or directly after washing, and share the expected moisture range.
Why Zig-Zag Classifiers Outperform Generic Air Separators
| Decision Criteria | Single-Stage Air Separator | Rumtoo Zig-Zag Air Classifier |
|---|---|---|
| Separation stages | One pass through an air stream | Multiple zig-zag stages for progressive separation |
| Cut-point control | Coarse — air volume only | Fine — air volume, baffle angle, and stage count together |
| Footprint | Wide horizontal layout | Compact vertical column |
| Near-density contaminants | Often missed in a single pass | Caught by repeated direction changes in the zig-zag channel |
Domande Frequenti
Cos e un classificatore ad aria zig-zag?
E una colonna verticale con deflettori angolari interni che creano piu zone di separazione. L aria ascendente trasporta i materiali leggeri verso l alto mentre i fiocchi pesanti cadono per gravita.
Dove nella linea di riciclo va posizionato?
Tipicamente dopo la fase di asciugatura e prima dell estrusione o del confezionamento fiocchi. Il materiale deve essere asciutto per la migliore separazione aerodinamica.
Puo rimuovere etichette di carta dai fiocchi PET?
Si. Le etichette di carta sono significativamente piu leggere dei fiocchi PET, rendendole un target ideale per la classificazione zig-zag.
Come evitare di perdere buoni fiocchi nella frazione leggera?
Regolando volume d aria e portata di alimentazione in modo che la velocita di taglio si trovi tra la velocita terminale del contaminante e quella del prodotto.
Serve la raccolta polvere?
Un separatore ciclone sull uscita della frazione leggera e standard. Per la polvere fine, si raccomanda un filtro a maniche aggiuntivo.
Serve una Fase di Separazione a Secco per Contaminanti Leggeri?
Condividi tipo di materiale, dimensione fiocchi, portata e il contaminante da rimuovere. Rumtoo consigliera il modello giusto di classificatore zig-zag.
Richiedi Proposta Air Classifier