ZPG Series
ZPG Vacuum Rake Dryer
Horizontal batch vacuum dryer with a scraper-blade rake for pastes, paste-like, and powdery materials.
- CE and ISO 9001 certified manufacturing
- Explosion-proof electrics available on request
- Mechanical or packing shaft seal options
- Solvent recovery process supported
Drying Equipment9
Standard Models
-0.096 MPa
Operating Vacuum
0.5-22 kW
Motor Power Range
Specifications
Technical parameters
| Model | Working Volume (L) | Heating Area (m²) | Stirring Speed (rpm) | Power (kW) | Jacket Design Pressure (MPa) | Cylinder Pressure (MPa) |
|---|---|---|---|---|---|---|
| ZPG-500 | 300 | 3.2 | 8-18 | 4 | 0.3 | -0.096~0.15 |
| ZPG-750 | 450 | 4.4 | 8-18 | 5.5 | 0.3 | -0.096~0.15 |
| ZPG-1000 | 600 | 5.1 | 8-18 | 5.5 | 0.3 | -0.096~0.15 |
| ZPG-1500 | 900 | 6.3 | 8-18 | 7.5 | 0.3 | -0.096~0.15 |
| ZPG-2000 | 1200 | 8.1 | 8-18 | 7.5 | 0.3 | -0.096~0.15 |
| ZPG-3000 | 1800 | 10.6 | 8-18 | 11 | 0.3 | -0.096~0.15 |
| ZPG-4000 | 2400 | 12.3 | 8-18 | 15 | 0.3 | -0.096~0.15 |
| ZPG-5000 | 3000 | 14.2 | 8-18 | 18.5 | 0.3 | -0.096~0.15 |
| ZPG-6000 | 3600 | 16.5 | 8-18 | 22 | 0.3 | -0.096~0.15 |
Water evaporation capacity varies with material properties and is subject to final design.
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View specificationsEngineering Advantages
Built for demanding vacuum drying duty
High Heat Transfer Efficiency
A large interlayer heating area maximizes conductive heat transfer to the material, shortening drying cycles versus tray or oven drying.
Continuous Material Circulation
The built-in scraper rake constantly lifts material off the hot cylinder wall and folds it back into the bed, keeping heating uniform across the batch.
Sealed Vacuum Environment
A fully enclosed vacuum chamber protects oxygen-sensitive, explosive, or toxic materials from contamination and oxidation during drying.
Solvent Recovery Ready
Vapor drawn off under vacuum can be condensed and recovered, supporting solvent-laden feedstocks and reducing raw material loss.
Precision Shaft Machining
The stirring shaft and rake blades receive specialized machining for concentricity and strength, minimizing wear and vibration over long duty cycles.
Configurable Sealing
Mechanical seal or packing seal options let you match sealing performance and maintenance interval to your process requirements.
Half-Pipe Jacket on Larger Models
Units above 5 m³ use a half-pipe jacket design, distributing heating medium evenly across the larger cylinder surface for consistent temperature control.
Configurable Filter Media
Filter media at the vapor outlet can be specified to match material characteristics, preventing fine powder carryover into the vacuum system.
Nine Standard Model Sizes
Working volumes from 300 L to 3600 L across nine standard models make it straightforward to match capacity to production demand without custom engineering.
Working Principle
The vacuum rake drying cycle
- STEP 01
Charge Material
Wet paste, paste-like, or powder material is loaded into the sealed horizontal vessel through the feed port.
- STEP 02
Seal & Evacuate
The chamber is sealed and the vacuum system draws down pressure, lowering the boiling point of surface moisture.
- STEP 03
Conductive Heating
Steam, hot water, or thermal oil circulates through the jacket, conducting heat through the cylinder wall into the material bed.
- STEP 04
Rake Agitation
The scraper-blade rake continuously turns the bed, clearing hot surfaces and folding material for even heat exposure.
- STEP 05
Vapor Extraction
Evaporated moisture or solvent is drawn out by the vacuum pump and condensed for recovery where required.
- STEP 06
Discharge Product
Once target moisture is reached, the sealed discharge port releases the dried product without breaking the vacuum environment.
Structure Diagram
Inside the equipment
Front view (top) and internal rake layout (bottom) of the ZPG vacuum rake dryer, showing the jacketed cylinder, spiral rake shaft, vacuum and feed connections, and drive assembly.
Key Components
- Safety Valve
- Vacuum Pumping Port
- Feeder
- Pressure Gauge
- Steam Inlet
- Discharger
- Condensate Water Outlet
- Control Cabinet
Application Industries
Industries relying on the ZPG series
Fine & Specialty Chemical
- Pigments, dyes, and resin pastes
- Explosive or strongly irritating powders
- Solvent-wet paste and filter cake drying
Explosion-proof motor and electrics available for hazardous duty.
Environmental Protection
- Sludge and filter residue drying
- Solvent recovery from waste streams
- Hazardous or odorous byproduct treatment
Sealed vacuum operation limits fugitive emissions during processing.
Battery Materials Recycling
- Cathode and anode precursor drying
- Recycled black mass moisture removal
- Contamination-controlled powder handling
Inert gas purge available to protect moisture- and oxygen-sensitive battery powders.
Pharmaceutical
- API and intermediate drying
- Low-temperature drying for heat-sensitive actives
- Enclosed process limiting cross-contamination
GMP-oriented configuration available; confirm documentation requirements with our engineers before specifying for regulated production.
Why Choose Ruibo
Reasons processors specify Ruibo
Proven European-Derived Design
Built on established European rake-drying technology, refined for reliable batch performance across nine standard model sizes.
Contamination Control
The fully enclosed jacketed vessel isolates material from ambient air, protecting product purity and operator safety.
Low-Temperature Capability
Vacuum operation lowers the required drying temperature, preserving heat-sensitive actives, enzymes, and crystal structures.
Serviceable by Design
Accessible seal assemblies and a robust shaft design simplify maintenance and reduce unplanned downtime.
Certified Manufacturing
Every unit is built under a CE and ISO 9001 certified quality system, with material traceability on pressure parts.
Scales With Your Process
Working volumes from 300 L to 3600 L across nine models make it straightforward to match capacity to production demand.
Materials Handled
FAQ
Common questions about the ZPG series
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