MIXING TECHNOLOGY | PROCESSING
mixers is that they are only better mixed in two dimensions. “That is their fundamental flaw because what’s needed is better mixing in three dimensions,” says Luker. The Molecular Homog- enizer has a multiplier of 100 and, treated like a two-dimensional static mixer, he says its seven mixing elements make 100 trillion layers. Randcastle says the Molecular Homogenizer, like
a static mixer, is simply designed, works the same no matter how the mix changes, and once installed does its job without operator intervention. The device also does not use pressure to convey the mix as is required with a static mixer, so output is not compromised. And, unlike a twin screw extrud- er, it does not require taking apart and reassem- bling. More details of the function of the device can be found in Compounding World’s recent article on alternative compounding technology
Changing requirements Production practices in mechanical process engineering are changing due to new require- ments and the need for more frequent product changes for compliance with stricter occupational and environmental protection restrictions, says
Hans-Joachim Jacob, Senior Expert Process and Applications at Ystral, a Germany-based mixing and dispersion technology specialist. He has identified five trends in mechanical process engineering that processors need to be aware of to enhance productivity (more here). Forward-looking process technologies rely on
process intensification to achieve more efficient use of time, energy and raw materials. Jacob says Ystral’s Conti-TDS disperser is operated outside of the vessel and designed to concentrate the processes of wetting and dispersing in one dispersing zone with an effective volume of only approximately a quarter of a litre. Compared to a high-speed dissolver operated inside the vessel, it generates approximately 30,000 times higher volume-specific power — crucial for successful dispersion — while the rotor-stator system builds up shear forces a thousand times higher for extremely short material dwell times. More rigorous specifications concerning
occupational safety, growing hygiene demands, and use of sensitive electronics mean processes must operate free from dust, gas and fumes. Conventionally, powder materials are added in an
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