The screw spiral can be provided with an extra inner spiral to increase axial strength and provide added capacity for ascending conveyors.

• Solution for difficult transportation problems
• Few wearing parts – requires minimum maintenance
• Cold-rolled, failure strength in excess of 500 N/mm2
• Durable, non-corroding trough structure
• Turnkey delivery
• Replaceable trough lining
• Polyethylene-based plastic – for standard applications
• Polyurethane – for heavy-duty applications
• Steel lining – for heavy-duty applications

The shaftless screw conveyor is a superior solution for transporting sticky, long-fibred materials, rags, yarns, metal particles, etc. Thanks to its shaftless design, yarn-like materials cannot become entangled around the conveyor’s shaft, nor can it become clogged by sticky materials.

The diagrams show rated capacities for various inclination angles for standard dried municipal sludge and a 35r/min drive unit. The capacity of the horizontal conveyor is based on a 25% filling rate.

1) Angle of spiral S=D
2) S=2/3D
3) S=2/3D with internal threadhorizontal conveyor is based on a 25% filling rate.

• Troughs lined with wear-resistant material
• Available in lengths up to 20 m
• Manually or motor-operated sliding gate for discharge box
• Turnkey deliveries with preferred length and structure complete with support feet and ceiling mounts