Shaftless spiral conveying since 1983
Our shaftless screw conveyor runs without a centre shaft. That shaft is exactly where conventional screw conveyors fail: fibrous, bulky and stringy material wraps around it until the conveyor blocks. We build the system that moves it anyway — purpose-built for your material and your route.
Design limits
One operating principle across every size: our shaftless screw conveyors carry everything from metered trace quantities to power plant feeding.
Guide values. The binding design follows from the material, the route and the requirement profile.
The principle
A conventional screw conveys material around a centre shaft. Anything that can wrap around that shaft eventually does: films, fibres, wires, cables, grape stems. Our spiral has no such shaft — shaftless, also called coreless. The cross-section stays clear.
Bulky items up to roughly 400 mm, fibrous and stringy material pass straight through instead of bringing the system to a halt.
Without a centre shaft there are no intermediate bearings in the trough — the usual maintenance points of a long screw simply do not exist.
The spiral pulls and pushes the material rather than cutting it. For pellets and anything else that must not be damaged, that is the difference between product and breakage.
Guided in a tube or a covered trough: virtually dust-free, low-noise and energy-efficient.
The system follows the building, not the catalogue. Length, incline and changes of direction are set by what is already there.
Routing
Because the spiral is flexible, the conveying line follows the building instead of the other way round. Horizontal, through bends, rising — usually as one continuous system without transfer points. The route shown applies to the flexible design, Type SL(N).
From a bunker, silo, moving floor, container or straight out of the process. The inlet geometry follows your bulk material.
Trough or tube conveyor. The run is effectively endless: if it grows too long for the chosen spiral type, a transfer carries it on to the next section.
On Type SL(N), changes of direction run through tube bends within the same line — every transfer point saved is one fault source fewer. The rigid Type RL(N), by contrast, stays straight; there a change of direction needs a transfer.
Rising sections continue in the same line. Vertical conveyors up to 28 metres are built as the rigid Type RL(N).
Into a boiler, press, silo, container or downstream system — metered, continuous or in intervals.
Two designs
Both spiral conveyors work without a centre shaft. The choice follows from particle size, throughput and the bend radius your route requires.
Type RL(N)
The rugged one
Rigid shaftless conveying spirals in steel or stainless steel for large volumes and bulky material. Built as a tube or trough conveyor.
Type SL(N) / KL(N)
The adaptable one
Flexible spirals in tube systems of steel, stainless steel or plastic. For powders, granulates, dusts and pellets — including awkward routes.
The full type ranges with lengths, throughputs and motor ratings are on the product pages.
View all type rangesIndustries
Shaftless screw conveyors work across four areas we have supplied for decades — and a range of further applications where the same principle holds.
BiomassWood chips, hog fuel and pellets: silo and bunker filling, moving floor discharge, container loading.
EnergyBoiler feeding for heating and biomass power plants, wood gasification, ash discharge, sewage sludge and RDF.
RecyclingElectronic scrap, glass, plastics and scrap processing — abrasive, bulky, inconsistent.
Wine & fruitWhole grapes, mash, stems and stalks, wine and fruit pomace — gently handled, in stainless steel.
ComponentsConveying spirals, drives and spare parts on their own — from 150 sizes in stock.
Other industriesSteel and stainless steel fabrication, waste, scrap, glass and paper industries, sludges and filter cakes.From practice
Almost every system we build is one of a kind. Three examples showing how far apart the tasks can be.
Vertical conveying of hog fuel into a high bunker — no transfer station, one continuous shaftless spiral.
Sticky, fibrous material with sharply varying moisture — the task conventional screw conveyors typically fail at.
Taken directly off the moving floor and passed on to boiler feeding — continuous and metered.
The company
Wildfellner has designed and built in Buchkirchen near Wels since 1980. We are the Austrian market leader for shaftless conveying technology and supply far beyond the German-speaking countries: exports account for 50 to 60 percent.
Auf einen Blick
Inquiry
For a sound budget quotation we need your material and your route. The more precise your figures, the more precise our proposal — only a few fields are required, everything else helps us with the design.
Prefer to talk? Give us a call and we will go through the questionnaire together.
+43 7242 28110‑0office@wildfellner.atThis questionnaire is the basis for the quotation. Responsibility for the accuracy of the information rests solely with the person providing it.
We normally get back to you within one working day. If it is urgent, you can reach us directly on +43 7242 28110‑0.
