improves the flow of material into the extruder barrel and air out of it, eliminating the material
build up in the extruder feed port that restricts output and causes torque surges. Because of
this, low density materials and fines often required a side feeder .
heat from the agitator shaft and the screw elements as well as the barrel minimizes the risk of
pre-curing. This allows material with curing temperatures as low as 100°C to be processed
reliably and enables coatings for a range of temperature-sensitive substrates, such as wood,
to be produced .
The co-rotating twin screw extruder continues to play a major role in the Powder Coating industry
due not only to its unique mixing characteristics , but also to the development of a range of extruders
specifically designed for this market. Many advances have been made in twin screw technology, especially in recent years with particular emphasis on increased performance and cost effectiveness.
These have been achieved through progresses in design and manufacturing techniques coupled with a better understanding of the mixing process. The latest developments include the use of screw speeds considered impossible only a few years ago. These have been made possible by improving the stability of the overall compounding process and by a close collaboration between the extruder manufacturer and the Powder Coating producer.