Purging

Purging compounds are used by processors to clean out polymer, color and other impurities from the machine and tooling between production runs. There are three general kinds of purging compounds: chemical; abrasive; and non-abrasive.

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Try This Lower-Cost Purging Method
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Try This Lower-Cost Purging Method

You might be able to reduce purging times and save money by scheduling processing jobs in order of the increasing material viscosity. But to get started, you'll need shear rate/viscosity curves for your polymers.

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'Circular Economy' Dominates Discussion of Resins, Additives at K 2019

New product launches from materials suppliers at the giant show shine light on sustainability. 
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Materials: Multi-Resin & Process Economical Purging Compound

Slide Products’ new Econo-Purge also works on hot runners ahd thoroughly purges manifolds with small gates.