How do I change and clean the barrel?

For barrel purging at lower temperatures of around 200C we use Polypropylene (RM032). For higher temperature extrusion, we use Calcium Carbonate based masterbatch (RM8076) 400c. We purchase these from Silvergate (UK based).

Alternatively, there are two bespoke products that can be used to purge industrial barrels:

Asaclean, a high temperature purging agent used in the US.
Ducapurge a thermoplastic purge compound from the UK:
When extruding completely different types of materials, we recommend having extra screw and barrels. We sell these here.

Ducapurge a thermoplastic purge compound from the UK:
http://www.colourtone-masterbatch.co.uk/pdf/ducapurge_datasheet.pdf

Extra screw and barrels are useful, when extruding completely
different types of materials.