Screws with a pitch spacing equal to the diameter are considered standard and are suitable for most conveyors if conventional horizontal design.
Short Pitch Flight
Short pitch screw are used in inclined conveyors. They are also used to control the feed at the inlet and to reduce flushing of free flowing materials. The shorter the pitch the more efficient is the screw.
Variable Pitch Flights
Variable pitch flights are used to control the amount of material drawn down along the length of the hopper. By increasing the pitch at each flight along a screw you can incrementally increase the volume of production that is allowed to enter the screw.
Ribbon flights with integral support legs are used for sticky or cohesive materials that tend to build up on the flight-pipe interface also used for mixing material during conveying
Tapered flight spirals provide a continuous incremental change in swept volume of the screw. This promotes even drawdown in a full hopper situation. Tapered flights leave residual material in the conveyor unless the casing is tapered to suit
Notched flights are used to provide a gentle mixing action. Notched flights are useful in blending different materials during the conveying process.
Double Start Flight
Double start flights are used to accelerate the conveying process the conveyor inlet and even out the pulsing effect at the outlet. They are also typically used in drilling and post-hole augers to equalise the torsional forces on the auger
Centreless flights are used for extremely sticky or fibrous materials that tend to wrap around or build up on a centre pipe. (Not manufactured by Bruton Spiralflite)
Conical flight centres provide a continuous incremental change in swept volume of the screw. This promotes even drawdown in a full hopper situation. Combined with variable pitch the coned screw provides the best possible solution to even hopper drawdown standard troughs can be used with coned flights.
Notched & Folded Flight
Notched and folded flights provide a more aggressive mixing action where material that passes through the notch is lifted and missed with the trailing material. they can also be used for aerating or cooling material