Type Factor
It is a factor depending on the type of screw in the conveyor. The type is selected according to transport process and the material.
Examples of basic types with the factor value :
| I |
II |
III |
IV |
| Full |
Ribbon |
Paddle |
Cut |
| 1.0 |
0.7 |
0.75 |
0.5 |
Fill Factor
It is the filling level of the conveyor and depends primarily on the type of transported material. Each material has
its own factor, which is experimentally determined.
Examples of values:
| I |
II |
III |
IV |
| 0.50 |
0.35 |
0.20 |
0.10 |
Values for individual materials are listed in the Materials section.
Angle Factor
It is used for conveyors inclined to the horizontal - as the inclination increases, the conveyor's capacity decreases.
On the chart you can see that the 30 degree conveyor has only 30% capacity compared to the horizontal.
Some of the values:
| Angle: |
0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
45 |
| Factor: |
1.00 |
0.99 |
0.90 |
0.72 |
0.55 |
0.41 |
0.30 |
0.21 |
0.15 |
0.12 |
Chart showing dependence:
Note: If you want to see the halves of the angle on the chart - hover your mouse over the line and wait a moment.
Resistance Factor
It is conventional factor caused by moving material which mainly depends on the properties of this material
and also local transport conditions. Each type of material has its own factor - usually in the range from 2 to 4.
Materials
The following table shows the properties of some materials:
| Name: | Minimum
Bulk Density [t/m3]: | Maximum
Bulk Density [t/m3]: | Fill Factor: | Resistance Factor: |
| Ash Dry | 0.56 | 0.7 | 0.12 | 3 |
| Ash Wet | 0.7 | 0.9 | 0.12 | 3.5 |
| Barley | 0.45 | 0.8 | 0.4 | 2.3 |
| Cereal Flour | 0.45 | 0.65 | 0.4 | 2.3 |
| Coke | 0.45 | 0.65 | 0.3 | 3 |
| Earth Dry | 1.2 | 1.8 | 0.3 | 4 |
| Graphite Powder | 0.35 | 0.45 | 0.4 | 2.5 |
| Lime Slaked | 0.6 | 0.7 | 0.35 | 2.3 |
| Lime Unslaked | 0.7 | 0.96 | 0.3 | 2.3 |
| Oat | 0.4 | 0.6 | 0.4 | 2.3 |
| Rye | 0.68 | 0.79 | 0.4 | 2.3 |
| Salt kitchen | 0.8 | 1.3 | 0.3 | 5 |
| Salt Rock | 1 | 1.5 | 0.3 | 5 |
| Sand Dry | 1.4 | 1.7 | 0.25 | 5 |
| Sand Wet | 1.8 | 2.1 | 0.25 | 5 |
| Sawdust | 0.2 | 0.3 | 0.3 | 2.8 |
| Sugar Crystal | 0.75 | 1 | 0.4 | 3.5 |
| Wheat | 0.65 | 0.83 | 0.4 | 2.3 |
| Wood Chips | 0.3 | 0.35 | 0.3 | 2.5 |