The first operation to do is to clean the screw.
The old materials and masterbatches deposits on the screw, generating stripes and black spots.
The hot runners are very often full of deposits of old plastic and masterbatches.
It can happen that during the first purging Ultra Plast remove colors which have been processed months before.
Furthermore,by removing old deposits all metal surfaces will be clean and blank.
ULTRA PLAST PO-C and QUALIPURGE PO-CS clean both, screw and hot runner.
You will have only one grade of purging compound, avoiding confusion and reducing stock of purging material.
Many mould makers are building moulds in order to save material by reducing more and more the thickness of plastic items.
We developed a special material for this kind of moulds.
QUALIPURGE PO-HCS will fill completely the cavities without increasing injection pressure. In this way, pieces can be extracted with the robot, and the cleaning procedure will be easier.