Screw Description of Twin Screw Extruder

Owing to the modular design of the twin screw extruder screw elements and screw barrels, conveying, plasticizing, homogenizing, pressure build-up and devolatilization zones can be established, depending on the process task.
For product intake and conveying, screw elements are used. The extruder can be fed with powder, pellets, chips, melt, paste, etc.
Plasticizing, mixing and dispersing are done by the twin screw extruder kneading elements. By varying the thickness of the kneading disks and their angle of stagger, their mixing, shearing and dispersing action can be adjusted to the individual requirements.
The screw elements are arranged on screw shafts. The co-rotating and closely intermeshing screw shafts have a sealing profile. This means：
Self-cleaning of the screw elements.
No excessive stress on individual product particles.
Narrow residence time distribution.
Uniform load on product.
Short times for color change.
At the end of each screw shaft, a screw tip is fitted by which the elements are held in position axially on the screw shaft. Each screw shaft is connected with the power output shafts of the gearbox by means of a screw shaft coupling. A screw shaft sealing system ensures that no product w…leave the processing section and flow toward the gearbox.