Don’t assume that when you are getting consistent feed with your volumetric feed system as this needs to be tested. Situation: A customer was having significant issues with a PVC twin screw profile extrusion line where the line would break often during production without any obvious cause as well as provide profiles which would vary […]
Category Archives
Plastics Technology
Using Process Monitoring Systems
Process monitoring systems are a great resource for the Scientific Molder. Question: We already have a {brand-name} production monitoring system and are now considering using it to also monitor the process. My Response: In practice most companies use such systems helpful to look for individual short shots or analysis of past problems. This is essentially […]
Colorant Mixing Issues
In a recent processing forum there was a common question regarding color swirls and colorant mixing. There were many common responses such as adding back pressure, speeding up screw speed, slowing down screw speed, changing screws, adding mixing elements, etc. Let’s get back to basics for a moment… RE Colorants: The aspect particular to colorants […]
NEW! Free Purging Cost Analysis App
Routsis Training has developed a new Purging Cost Analyzer app to help scientific injection molders compare the cost of different purging methods. This free tool serves as a companion to the purging strategies discussed in our Purging for Scientific Molders online training series. Automatically calculate costs associated with purging compound, machine downtime, labor, production resin, scrap & […]
Never Empty the Barrel
The only time you should empty the barrel of your machine is when you are preparing to remove the screw. Concern: When discussing purging with most injection molders, the first step they follow is to empty the barrel of material. This practice is much less common in both extrusion and blow molding, but for some reason […]