Shaftelss screw conveyor is made up of u trough or v trough + plastic lining + shaftless screw flight + bearings + gland packing + motor &gearbox.It is suitable for transporting sticky materials which has poor flow ability.See its photos as below :
Shafted screw conveyor is suitable for transporting materials with good flow ability.Such as dry medicine powder,chemical granules,plastic particles,etc.
See its photos as belwo :
http://www.wxconveyor.com/