Adjustable Grooved Barrel Extruders

2 Eliminating Drawbacks with Grooved Feed Extruders 

The adjustable grooved feed extruder developed at Rauwendaal Extrusion Engineering [246] uses a grooved feed section in which the depth of the grooves can be continuously adjusted while the extruder is in operation. Parallel developments have taken place in Poland at the Technical University of Lublin [244, 245). Earlier concepts have been developed [247], however, due to the complexity of the adjustment mechanism, these have not been applied on a wide scale. 

There are two basic methods by which the groove depth can be adjusted  

By moving an insert (key) in the barrel groove in radial direction. 

By moving a tapered key along a barrel groove with reducing depth in axial direction. 

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