PVC Purge: no more stripping of die heads for degraded PVC
PVC Purge is a product ahead of its time. Although most PVC bottle makers have changed to other options, there are still companies that continue to strip down their machinery. This can be consigned to history with PVC Purge.
We know that PVC suffers from hydrochlorination, which means that it degrades and gives off hydrochloric acid. This process is autocatalytic – meaning that the hydrochloric acid causes the PVC to degrade further.
Because PVC Purge cleans the die pin and the head (which is normally cleaned during a manual strip-down), as well as the screw, barrel and swan neck, this means that no previously degraded PVC will cause premature degradation of the head and die.
PVC Purge is a highly filled, calcium-zinc stabilized PVC grade of purging compound which cleans by purely mechanical means. PVC Purge is also self-indicating: it is light blue in colour, so if it comes out brown it is bringing out carbon – so keep purging.