Today's KNOWLEDGE Share : PVC is one of the materials processors respect for a reason.

Today's KNOWLEDGE Share

PVC is one of the materials processors respect for a reason.

It degrades easily.


Heat and shear will start the degradation process, and once it begins it tends to accelerate.


As PVC breaks down it releases hydrochloric acid (HCl), which then promotes further degradation in the material around it.


Over time that leads to carbon deposits forming inside the screw and barrel.


Anyone who has run PVC for extended periods will have seen the effects:


• carbon build-up

• black specks appearing during changeovers

• instability after material transitions

• screws needing to be pulled and manually cleaned


Historically, many processors dealt with this by stripping down the machine.


Effective, but time-consuming and expensive.


PVC Purge was developed to deal with that specific problem.


It works through a mechanical scrubbing action designed to remove carbon deposits from the screw and barrel without requiring a full strip-down.


Used regularly, it helps keep the unit in a stable condition so degradation deposits don’t continue to build up over time.


It’s used in extrusion, injection moulding and blow moulding environments where PVC is processed.


And for plants still running PVC regularly, it can make a significant difference to how often machines need to be dismantled for cleaning.


source : John Steadman

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