Tumbler Screening Machine

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Gentle Fine Screening with Three-Dimensional Tumbling Motion

Screen Diameter:	400–2,600 mm
Screen Decks:	1–6 Layers
Fine Screening:	Down to 20 μm*
Construction:	Mild Steel / SS304 / SS316L

Three-dimensional elliptical motion for gentle particle separation.

Suitable for fine powders, granules and fragile particles.

Supports multi-size classification in a single operation.

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What Is a Tumbler Screening Machine?

A tumbler screening machine uses low-frequency, three-dimensional elliptical motion to separate fine powders and granules by size. Achieves 95–99% accuracy for materials down to 20 microns, with 5–10× the throughput of vibrating screens per unit area. Gentle tumbling action prevents damage to fragile or agglomerated materials.

Unlike vibrating screens that bounce particles violently, this equipment keeps material in continuous contact with the screen surface, giving borderline particles maximum pass-through opportunity.

How It Works

Four-step process:Material feed – Fed continuously into the center of the top deck.3D motion – Low-frequency elliptical motion (radial + tangential + eccentric) driven by motor and eccentric weights.Spiral distribution – Material spirals outward; fine particles pass through near the center.Discharge – Coarse particles exit at the edges; borderline particles get extended retention time.The motion mimics hand screening—gentle tumbling, not violent shaking. Movement is adjustable via a patented system.

Key Advantages

95–99% efficiency – NJ pharma facility (2025–2026): 98.2% on 325-mesh API over 4,000 hrs; batch rejects down 67%.

5–10× throughput – US Midwest plant replaced 3 vibrating screens with 1 unit (2025); energy -62%, maintenance -70%.

Gentle handling – Lab test (Q4 2025): 98% particle integrity vs. 78–85% for vibrating screens.

5–10× longer screen life – German chemical plant: 11 months vs. 6–8 weeks; 7× improvement.

Anti-blocking – Netherlands food plant: ultrasonic cut cleaning from 4 hrs to weekly (early 2026); uptime +30%.

<75 dB noise – Fully enclosed, dust-proof.

1–6 decks, 400–2600mm – Customizable.

Technical Specifications

Parameter	Range
Diameter	400 – 2600 mm
Decks	1 – 6
Area per deck	0.28 – 6.4 m²
Feed size	20 microns – 20 mm
Capacity	1 kg/h – 50 t/h
Accuracy	95 – 99%
Speed	120 – 360 RPM
Noise	<75 dB
Materials	Mild steel, SS304, SS316L

Benchmark (100–500 mesh):

Parameter	Range
Diameter	400 – 2600 mm
Decks	1 – 6
Area per deck	0.28 – 6.4 m²
Feed size	20 microns – 20 mm
Capacity	1 kg/h – 50 t/h
Accuracy	95 – 99%
Speed	120 – 360 RPM
Noise	<75 dB
Materials	Mild steel, SS304, SS316L

Applications

Food – Sugar, flour, starch, spices. US refinery (8 t/h, 120 mesh, 2025): 98.5% efficiency, zero degradation. UK mill (200 mesh, 2025): contamination -40%.

Pharma – APIs, excipients. Ireland (200–500 mesh, Q3 2025): changeover 4 hrs → 45 min; throughput +60%.

Chemical – Resins, pigments. Germany (2025): 11-month screen life; €5,200+ annual savings.

Mining – Minerals, graphite. Canada (early 2025): throughput +45%, energy/ton -55%.

Other – Ceramics, abrasives, recycling. Dry/wet/de-dusting capable.

Comparison: Tumbler vs. Vibrating Screen

Metric	Tumbler Screening Machine	Vibrating Screen
Motion	Low-freq elliptical, continuous contact	High-freq vibration, bouncing
200-mesh efficiency	97-99%	82-88%
325-mesh API efficiency	96-98%	70-80%
Energy/ton	0.8-1.2 kWh	2.0-3.5 kWh
Annual downtime	20-30 hrs	80-120 hrs

Efficiency by material:

Material	Mesh	Tumbler Machine	Vibrating Screen
Food powders	80-200	97-99%	85-92%
Chemical powders	100-325	95-98%	78-88%
Pharma APIs	200-500	96-99%	70-82%
Minerals	30-200	93-97%	82-90%
Plastic pellets	4-20	98-99%	95-98%

Selection Guide

Material factors:Bulk density – Test before sizing; undersizing is common.

Particle distribution – Wider = may need more decks.

Moisture >5% – Consider anti-blinding accessories.

Abrasive – Choose stainless steel or hardened construction.

Electrostatic – May need grounding or specialty screens.

Example: Gulf Coast plant undersized 1.2m unit because density was 40% lower than estimated—needed 1.5m to hit 2 t/h.

Decks:1 deck → 2 fractions (scalping/de-dusting);2–3 decks → 3–4 fractions (intermediate classification);4–6 decks → 5–7 fractions (complex grading);Screen opening: 50–70% of target size for narrow distribution; 80–90% for wide distribution.Capacity: Operate at 70–85% of rated capacity for consistent performance.

Troubleshooting

Problem	Cause	Solution
Efficiency drop	Worn mesh, blinding, wrong feed rate	Replace mesh, clean, adjust feeder
Noise/vibration	Loose parts, worn bearings, imbalance	Tighten, replace bearings, re-balance
Material buildup	Poor spreader, wrong speed	Adjust spreader or eccentric angle

Standards

ISO 9001, ISO 14159 (hygienic design), CE Marking, ATEX

Food: FDA/EU food contact, 304/316L SS

Pharma: cGMP, crevice-free

Chemical: Corrosion-resistant materials

FAQ

What materials can it process?

Dry powders and granules from 20 microns to 20 mm: food, chemicals, pharma, minerals, plastics. Fragile and electrostatic materials also suitable.

How does it differ from a vibrating screen?

Motion. Low-frequency elliptical tumbling vs. high-frequency bouncing. Better for fine powders and fragile materials above 100 mesh.

What accuracy does it achieve?

95–99%. At 200 mesh+, stays above 95% vs. 80% or below for vibrating screens.

Can it be customized?

Yes: diameter (400–2600mm), decks (1–6), material (mild steel, 304 SS, 316L SS), cleaning systems.

What maintenance is required?

Monthly bearing lube, weekly belt checks, regular mesh inspection. Pneumatic lifting simplifies screen changes.

How long do screens last?

6–12 months (abrasive); 12–24 months (non-abrasive). 5–10× longer than vibrating screens.

Does it handle wet screening?

Yes—with spray bars, slurry feed, and enhanced sealing.

Decision Checklist

Material fully characterized (size, density, moisture, abrasiveness).

Efficiency target set.

Throughput defined.

Number of fractions determined.

Construction material specified.

Cleaning system selected.

Installation space confirmed.

Budget approved.

Regulatory requirements identified.

Conclusion

The tumbler screening machine delivers high precision, gentle handling, high capacity, and long screen life. Dahan equipment provides proven performance for food, pharma, chemical, and mineral processing—the industry standard for fine and ultra-fine screening.