Why use a screw conveyor?
When thinking about conveying bulk material, a number of options are available to you, the most commonly used are:

Belt conveyor
Pneumatic conveyor
Aero mechanical conveyor

So why choose screw conveying over those solutions?
First of all lets start with a quick definition of what a screw conveyor is : a device for moving loose materials, consisting of a shaft with a broad, helically wound blade rotating in a tube or trough. It is also often referred as an auger conveyor or an helical conveyor.

The definition and images on Wikipedia can also be of help to get a better idea of the possible applications for such devices. It can also be called a worm conveyor in some cases.

There are a number of advantages for screw conveyors :

The possibility to handle from dry solids to semi fluid materials
The cost effectiveness of the solution
The possibility to have multiple inlets, outlets and discharge points in the conveyor
The possibility to build an enclosed conveyor for corrosive or hazardous requirements

On top of those advantages for traditional shafted screw conveyors, you can also add some specific advantages for shaftless screw conveyors:

Possibility to handle sticky and sluggish bulk material without the risk of material building up around the screw`s shaft
The efficiency is higher due to the fact that the conveyor can work with a filling rate of up to 100%
Because the shaftless screw conveyors do not need hangers and bearings, layout is much easier, therefore saving space and money

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