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Posts Tagged ‘Blue’

www.purgexonline.com – Injection Molding Process Color Change Blue to Clear -PURGEX offers a complete line of commercial purging compounds to meet any need. All of our products can be used for color and material changes, as well as to remove any residual contamination in thermoplastic injection molding, extrusion, or blow molding machines.

Question by Brijesh: Plastic Injection Molding Operation, Need 2 purge the barrel from Blue 2 White. (polyolefin base)?
Traces of blue color is not cleaned completely.

Best answer:

Answer by markmold
There are several commercially available purging compounds that work quite well. I’m assuming you want the quick fix though. When I don’t have any of the commercial stuff available I usually reach for some acrylic regrind that I have lots of on hand and was given by another molder. If you have any blowing agent this also works well.
Here’s an old molders trick try sprinkling a little Baking Soda into the mix and crank up the temps a bit, a few drops of water won’t hurt either. It might foam up a bit but it’ll scrub the residuals out.

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