Shaftless Screw or Spiral Conveyor is an alternative concept to the traditional shafted screw conveyor. Material is conveyed by an extra-heavy-duty shaftless screw that slides on a low-friction, wear-resistant liner inside the conveyor trough housing. 

Shaftless spiral conveyors are successfully used to transport jamming, bridge forming and sticky materials. Astim shaftless screw conveyors can be furnished in a wide variety of materials to resist corrosion, abrasion and exothermic conditions.

Shaftless screw conveyor systems offer great flexibility over a wide range of applications, and can be with connected at angles on one `horizontal plane` and with angles of inclination. Installations can be enclosed with hinged or removable lids to control dust or odor emissions. Further options include: funnels, bottom outlets with or without (pneumatic) slide valves, dewatering sections, safety switches, heating/ isolation, switch boxes, washing systems etc

The Shaftless Screw (spiral) offers a larger volume capacity and the possibility of handling particularly difficult materials such as those that tend to become tangled up or those that present highly variable particle size. Construction material properties, oversize thickness, as well as a special manufacturing process make the spiral highly resistant and extremely durable. Due to the absence of intermediate bearings, obstacle-free material handling is guaranteed. The completely enclosed trough prevents any material leakage. Trough covers with appropriate gaskets enable odour-free operation and form a barrier to any atmospheric agents to enter the system. At the same time the conveyor offers maximum access to the inside for inspection and cleaning. Maintenance is reduced to the minimum due to a small number of components. There is a vast choice of liners depending on the specific material characteristics.

SSC Shaftless Screw (Spiral) Conveyors have been specially designed for handling of difficult heterogeneous materials like urban solid waste, screenings and floating matter, de-watered, thickened, conditioned sludge, packaged food, creams or pastes, waste from: meat, fish, fruit and vegetable processing. 

Fields of applications 

The main sectors of application are: wastewater treatment, sugarhouse rejects, fish industry, solid waste treatment, fruit and vegetable processing plants, beverage industry, pulp and paper, chemical industry, food industry in general, meat processing plants, abattoirs/slaughterhouses, restaurants, canteens, catering in general.


• -Tailor made design.
• -Carton steel, stainless steel or abrasion resistant steel are available.
• -"U" shaped or to provide a wider opening "V" shaped trough can be manufactured.
• -Fully enclosed trough ensures dust-free environmentally friend operation.
• -Shaftless screw minimizes the risk of clogging.


• Low maintenance costs
• Handling of difficult materials
• Space-saving overall dimensions
• Clean operation and absence of odours
• High efficiency
• Easy access and cleaning
• Total material discharge
• Simple design (few components)
• Hardly any maintenance required
• Modular system, easily adaptable to different applications extremely versatile


U-Trough and cover: Steel or stainless steel AISI304 or AISI316 Spiral: Special Steel or stainless steel AISI304 or AISI316 Wear Liner: PEHD 1000 or steel or stainless steel Drive Unit: Shaft mounted helical-gear motor