The viscosity of polymer melts is a key parameter for quality and control during every stage of the polymer manufacturing process, including injection molding, compression molding and extrusion. Molecular chain length (or molecular weight) is the most important indicator when measuring polymers across every stage. Chain length tells the operators how well the product has polymerized, which is critical for the properties of the finished product, which might be granules, film, fibers or molds. The strength, hardness and density are all key parameters for product quality, and can be controlled by viscosity. [Read more…] about Hydramotion releases polymer-melt viscometer
A common question is how the Hydramotion torsional vibration (resonant) viscometers are different from the older rotational devices. On the surface the technologies may sound similar, but they’re completely different, and in many cases you’ll get different measurements with the same fluid and conditions. That’s another question we also get a lot: why does my Brookfield lab viscometer give me viscosity readings that are so much higher than my Hydramotion inline XL7 (or ViscoJet)? Here are some of the basic answers. [Read more…] about Rotational vs. Torsional Vibration Viscometers – What’s the Big Deal??