The majority of Continuous Extrusion Blow Moulding machines work on a high volume, small margin basis. This added to the increasing "Just In Time" delivery requirements of customers have resulted in a challenging environment for all blow moulders.

With the inherent hold up points in all head designs, lengthy colour changes and black specking (loosened, degraded polymer or masterbatch) are everyday occurrences in the life of a blow moulding machine.

With the introduction of aquapurge products this everyday trait has all but disappeared.