In order to correctly design a screw feeder system, there are certain parameters that have to be taken into account.
This is why Atara equipment individually designs and manufactures each system to meet the not only the clients footprint but also and possibly more important, the constraints of the clients product.
These products have their own individual challenges:
Abrasive, Alkalinity, Fluidisation, Hydroscopic, Sticky, Etc.
All of the above have an influence on the hopper, conveyor, inlet chute, discharge chute and spiral design.
When designing a system for a specific application, the product characteristics are usually taken into the design of the spiral.
Whether using a larger shaft tapering down to a standard shaft (Limiting the amount of product being removed from the hopper and transported).
Or a varying pitched spiral inside the hopper accomplishes the same effect (less material allowed to enter into the decreased area of shorter pitches) once past the hopper bulkhead the material would be transported using a standard pitch Spiral).
Screw feeders utilizing shaftless screws.
Simpler and accurate dosing systems designs are possible when incorporating shaftless spirals due to the shaftless spirals' ability to transport products at a 100% fill rate.
The hopper discharge (shaftless) spiral at 100% full delivers a constant volume of material.
The injector (axially connected to the hopper discharge conveyor) running a little faster than the hopper discharge spiral ensures a smooth and accurate flow of material.
Our products' design is made for increasing the accuracy of product delivery, while reducing the pulsing effect, (usually attributed to screw feeders).
Atara Equipment is currently supplying a double twin live bottom for to store and discharge sawdust and wood chips; the mixture is dosed out of the live bottoms using either 1 spiral or a combination of up-to 4 spirals to feed a crossing conveyor, which intern feeds the mixture into 2 mixers feeding the heating system.