Powders and fine materials
Transfer suitable flour, mineral powders, additives and other free-flowing or conditioned fine materials in an enclosed conveying path.
Enclosed bulk material handling
Screw & Auger Conveyor Systems
Meter, feed and transfer powders, granules and suitable bulk solids using a rotating helical flight in a trough or tube.
Overview
What this system does
A screw conveyor moves bulk material along a casing by rotating a helical flight around a shaft—or by using a shaftless spiral in suitable applications. It can provide horizontal or inclined conveying, controlled feeding and transfer between process stages. Selection depends heavily on the material properties and the required duty.
Main applications
Granules and pellets
Move suitable plastic pellets, grains, seeds and granular products between storage, dosing and process equipment.
Metering and feeding
Use a screw feeder or variable-speed drive to support controlled feeding where the material and required accuracy permit.
Process and bulk transfer
Connect hoppers, silos, mixers, bagging equipment and production machinery with horizontal or inclined screw arrangements.
Operating principle
How it works
Screw / Auger Conveyor
A screw conveyor moves bulk material along a casing by rotating a helical flight around a shaft—or by using a shaftless spiral in suitable applications. It can provide horizontal or inclined conveying, controlled feeding and transfer between process stages. Selection depends heavily on the material properties and the required duty.
A simplified illustration of the motion — not to scale and not a performance simulation.
Available configurations
Possible arrangements
U-trough screw
Openable or covered trough arrangement for accessible process and bulk transfer duties.
Tubular screw
Enclosed tube arrangement where containment and routing requirements favour a tubular casing.
Screw feeder
Hopper-mounted feeding arrangement designed around material flow and required discharge control.
Twin-screw arrangement
Parallel screw configuration for selected feeding, mixing or difficult-flow applications after process review.
Technical design basis
Technical characteristics
These items identify the information used to engineer this equipment. Numerical limits appear only where the referenced catalogue supports them; other values are confirmed for each project.
Screw conveyor capacity is not inferred from diameter alone. It depends on material bulk density and flow behaviour, flight geometry, pitch, speed, fill ratio, inclination and duty. Abrasive, sticky, hot, combustible or food-contact materials require specific material, sealing, guarding and process review.
| Material bulk density | Measured or supplied bulk density and its variation during operation. |
|---|---|
| Particle and flow behaviour | Particle size, cohesion, moisture, abrasiveness, temperature and tendency to bridge. |
| Screw geometry | Flight diameter, pitch, shaft/shaftless design, trough or tube and fill ratio. |
| Duty and inclination | Mass/volume flow, conveying length, inclination, start-up and operating hours. |
| Wear and containment | Liners, seals, bearings, cleanout, dust containment and material compatibility. |
Engineering considerations
What ENTRA needs to engineer the right solution
A useful proposal starts with operating conditions and interfaces. Final sizing is confirmed by engineering review.
Material properties
Bulk density, particle size and distribution, flowability, moisture, temperature, abrasiveness, corrosiveness and tendency to bridge or compact.
Duty and capacity
Required mass or volumetric rate, operating hours, conveying length, inclination, fill level, start-up condition and upstream/downstream equipment.
Flight and casing
Shafted or shaftless design, flight profile, pitch, diameter, trough or tube, cover, liners, cleanout points and material of construction.
Drive and maintenance
Drive location, torque duty, bearing arrangement, seals, access, inspection, wear parts and maintenance clearance.
Photographs
From ENTRA's project gallery
Captions identify the equipment shown; a photo is not a claim that every image is a completed installation of the exact configuration described.
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