Conveying Characteristics of Different Geometries

This procedure is usually carried out by a computer program. 

Producing profiles according to the planar offset results in the profde being dependent on the pitch, which Fig. 5.13 demonstrates. Particularly, the tip angle depends on the pitch. 

Double- and multi-flighted profiles form open drag channels through which the product can flow back [1, 2]. Single-flighted profiles can enclose the barrel angle fully and are therefore force-feeding, other than for the clearances. 

The feed properties of different profiles depend on the type of product being transported. An optimum scenario would be a bulk product with perfect wall slips that could be transported without deformation. In this case, a profile with pitch T and free cross-section surface Afree could convey a volume of Afree each revolution. Its inherent throughput would be 

Many plastic melts adhere to the walls. The feed coefficient for the pressure-free conveying of such melts in multi-flighted profiles can be estimated as follows 

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