Smithers issues 'Mixing in Single Screw Extrusion'
A
Smithers Rapra product story
Edited by the Engineeringtalk editorial team
Jun 18, 2009
Smithers Rapra Publishing has released 'Mixing in Single Screw Extrusion', written by Martin Gale, a former principal consultant at the company and the inventor of the cavity transfer mixer.
Most extruded plastics products contain additives and, as a result, mixing is involved at some stage during their production.
Mixing is normally associated with twin-screw extruders and conversion to products associated with single-screw extruders.
Consequently, the latter's potential mixing performance and economic gains tend to be overlooked, according to the company.
This book treats the subject in more detail, particularly with regard to present-day economics.
The idea that mixing in conventional single-screw extruders can easily be substandard for the application is illustrated in the first chapter, which describes a number of real examples of inadequate mixing.
The book goes on to explain why these typical shortcomings occur and the application of mixing principles, along with various practical approaches to eliminating such problems.
With the growing pressures to increase the amount of plastics recycling, both the limitations and success in blending the mainly incompatible polymer combinations are explained.
The development of 'add-on' cavity mixers and floating ring mixers, together with their methodology, are described, while the associated techniques using the liquid injection of colours, tackifiers, lubricants, cross-linking agents and foaming agents (particularly CO2) are also included.
The book also features a brief description of developments in controlled levels of blending by 'chaotic mixing' to produce products with very specific properties, such as barrier films.
Extrusion tests for carbon black dispersion are included and the book concludes with a practical guide to the preparation of microtomed plastics specimens for evaluation by optical microscopy.
'Mixing in Single Screw Extrusion' is aimed at a spectrum of expertise and experience, including engineers, chemists, plant operators and quality controllers.
As a consequence, this book avoids mathematical theory, except when absolutely necessary, and concentrates on the results instead, according to the company.
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