Conveyor system selection guide:
Types, pros and cons for bulk powder handling

There is no single best conveyor system for powder handling. The right choice depends on the powder’s properties, the throughput required, the route geometry, and whether the process runs continuously or in batches. For most dry, free-flowing powders and granules, aero-mechanical conveyors (AMC) and tubular drag conveyors (TDC) are widely regarded as strong options because they combine fully enclosed transfer (containing dust and protecting operators), gentle handling to preserve particle integrity and blend uniformity, and near-total batch transfers with minimal residue.

Dense-phase pneumatic conveyors suit longer or more geometrically complex routes where some particle attrition is acceptable. Screw conveyors and flexible augers can work for short straight runs and lower throughputs but tend to leave residue and may segregate blends. Belt conveyors and bucket elevators are generally less suitable for fine powders due to dust emissions. The reliable approach is to match the technology to the duty profile: gentleness, containment, vertical lift, route flexibility, batch completeness, and footprint. Don’t rely on throughput alone.

A conveyor system moves bulk materials from one point in a process line to another. Conveyors replace or reduce manual handling and enable continuous or semi-continuous production flow. In bulk materials handling, conveyors transfer ingredients between storage silos, hoppers, mixers, weighing systems, packing machines, and loading points. A well-chosen conveyor protects material integrity, contains dust and hazardous powders, fits within plant layout constraints, and supports production throughput targets. Conveyor systems are essential across food and beverage, pharmaceuticals, chemicals, mining, agriculture, minerals and resources, and manufacturing industries. They are used anywhere bulk material needs to move reliably and safely between process stages.

The main types of conveyor systems used in bulk materials handling are:

• Belt conveyor – A continuous moving surface used for high-throughput horizontal transfer of granules, flakes, and finished products.
• Screw (or auger) conveyor – A rotating helical blade inside a trough or tube that moves cohesive or slightly abrasive materials over short straight runs.
• Aero-mechanical conveyor (AMC) – A rope-and-disc assembly inside a sealed tube that gently lifts dry powders and granules vertically with minimal residue.
• Tubular drag conveyor (TDC) – A chain or cable fitted with discs running inside a sealed tube, designed for complex 3D routes with multiple inlets and outlets.
• Pneumatic conveyor – Positive or negative air pressure used to move powders and granules through pipes over long, geometrically complex routes.
• Bucket elevator – Containers attached to a vertical belt or chain that lift free-flowing granules and grains over lengthy vertical distances.
• Vibratory conveyor – A trough that uses controlled mechanical oscillation to move free-flowing or fragile materials over short horizontal distances.
• Flexible auger conveyor – A coiled spring inside a flexible tube that transfers small-to-medium volumes of free-flowing powders along curved routes.

Selection depends on the material being conveyed, the required throughput, the route geometry, and the production model.

Fine powders need a conveyor that contains dust, handles material gently to prevent attrition, and avoids causing blend segregation. The best options are typically aero-mechanical conveyors (AMC), tubular drag conveyors (TDC), and dense-phase pneumatic systems. All these choices all fully enclosed and able to move fine material without significant dust emissions or particle damage. Belt conveyors and bucket elevators are generally unsuitable because their open design allows dust to escape. Screw conveyors and flexible augers can handle some fine powders but often leave residue and may cause segregation in blended products. Highly cohesive or very fine powders (such as fine pigments or some pharmaceutical actives) typically do best in dense-phase pneumatic or tubular drag systems, sometimes supported by trace heating or vibration aids.

The best conveyor systems for food-grade applications combine fully enclosed transfer paths, food-contact-rated materials of construction, easy cleanability between batches, and gentle handling that preserves product integrity. Aero-mechanical conveyors (AMC) and tubular drag conveyors (TDC) are widely chosen for food applications because they enclose the product entirely, minimise residue, prevent cross-contamination during changeovers, and handle fragile materials such as nuts, cereals, and freeze-dried ingredients without breakage. Belt conveyors are commonly used for finished or packaged food products. Pneumatic conveyors can suit uniform powders such as flour or sugar but may cause segregation in blends. Any food-grade system should also support hygienic design principles, allergen management protocols, and applicable regional food safety standards.

An aero-mechanical conveyor (AMC) is a bulk material handling system that moves dry powders and granules through a sealed tube using a continuous rope fitted with evenly spaced discs. The rope and discs travel at high speed, generating an airstream that fluidises the material and carries it along, combining the gentleness of mechanical conveying with the efficient transfer characteristics of pneumatic conveying. AMCs typically handle materials up to around 12 mm in particle size, with capacities ranging from approximately 1 to 90 m³/h. They are well-suited to vertical and inclined transfers, preserve the integrity of blended recipes, contain dust and hazardous materials, and achieve near-total batch transfers with minimal residue. Aero-mechanical conveying was invented by Floveyor in 1958.

An aero-mechanical conveyor (AMC) moves material through a sealed tube using a rope and disc assembly that creates a controlled airstream as it travels. A pneumatic conveyor uses high-velocity air alone to fluidise and transport material through pipes. The key differences of an aero-mechanical vs pneumatic conveyor are in energy consumption, material handling, and route flexibility. AMCs use significantly less energy than pneumatic systems for comparable throughputs, treat materials more gently (reducing particle attrition and blend segregation), and achieve near-total batch transfers with minimal residue. Pneumatic conveyors can handle longer and more geometrically complex routes, hundreds of metres or more. However, particle attrition (especially in dilute phase), blend segregation, and high energy use are common trade-offs. AMCs are best suited to vertical and inclined transfers; pneumatic systems suit long horizontal runs with multiple bends.