You are running a huge batch of white plastic bottles. Everything looks fine until you pick one up and notice a faint blue streak running down the side. Now you have to scrap the last fifty bottles.
Cross-contamination is a total nightmare on the factory floor. It ruins your production numbers and waste very expensive material. Sometime it takes hours to get a clear bottle again. But you can actually stop those old colors and burnt carbons from ruining your new run if you change how you clean the machine.
The Problem Hiding Inside the Machine
Extrusion blow molding machines have a lot of tricky spots where old resin likes to hide. The screw flights, the die head, and specially the accumulator are perfect places for plastic to get stuck and slowly cook.
When you switch to a new color or a different clear resin, those hidden pockets slowly release the old junk into your fresh plastic. That is exactly how you get streaks, clouds, and black specks in your final product.
Stop Wasting Good Resin on Bad Changeovers
A lot of operators try to fix this problem by just running the machine fast and dumping hundreds of pounds of new, clean resin through the barrel. They hope the new plastic will eventually wash out the old color. But raw resin is not soap. It just slide right over the stuck pigment. You just end up filling scrap bins with bad bottles.
Pull the Junk Out Safely
To actually pull that stubborn pigment and hard carbon off the metal, you need something designed for the job. At UNICLEANPLUS™, we make a specific purging compound for blow molding that chemically grabs onto that old material and safely drags it out of the equipment.
It cleans the screw, barrel, and the die without you needing to take the heavy machinery apart with hand tools. Our compound is completely non-abrasive, so it won’t scratch up your expensive metal parts while it works.
Quick Floor Tips for Better Changeovers
If you want to keep your next blow molding run totally clean and fast, try these quick steps on the floor:
- Make sure your barrel heat match the recommended temperature for the UNICLEANPLUS™ grade you are using.
- Don’t rush the process. Let the purge compound sit inside the barrel for a few minutes so it can lift the hard deposits off the walls.
- Look at your purge lumps. If you still see the old color inside the lump, run a little bit more compound before you start feeding the new resin.
Stop letting cross-contamination kill your daily output numbers. You don’t have to guess if our chemical will fix your specific machine. We offer a free trial sample so you can test it directly on your own floor. Reach out to UNICLEANPLUS™ today, and our team will call you within 24 hours to help pick the exact right grade for your factory.