- the desired capacity and this pitch now determine: number of revolutions, screw diameter and
core diameter at the discharge.
- The increase of the capacity per length of screw is ixed now. The illing in of core diameter
and pitch can start.
- The core diameter at the start of the screw is chosen. For short screws this may be the same
as the diameter at the discharge, but mostly a bigger core has to be chosen. The minimum
pitch is calculated.
? The starting value of factor Z is chosen, in combination with the 'stickiness' of the product. The
resulting step in capacity can be smoothened with an extra blade with the starting pitch.
? The pitch increases until optimum transport is reached.
? If the core diameter at the start is bigger than at the end, the reduction of the core is
determined.