Hewitt, Christopher David (2016). Powder build-up in detergent packing lines. University of Birmingham. Eng.D.
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Hewitt16EngD.pdf
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Abstract
Build-up is a fouling process in which a small fraction of a powder becomes a film adhered to a surface. Specifically buildup in auger fillers which is the focus of this thesis is a significant problem for industry leading to equipment downtime for cleaning, drives tripping due to high torque and reduced powder quality.
The work presented in this thesis shows that for a unblended powder with a particle size similar to that of the auger fillers auger/tube clearance, build-up will be formed when powders have b-1 Kawakita parameter of less than 0.5 MPa and tablet strengths below 0.6 MPa post compression to 58 MPa.
It is proposed based upon results the work of Crutchley and Bridgewater [29] and Calvert et al. [30] that powders which form build-up due so due to the stresses they experience as they pass through the auger/tube clearance. Additionally this stress is a function of the ratio of the powder’s particle size to the magnitude of the auger/tube clearance C. Work presented in Chapter 8 supports this conclusion showing that once C/D90 is greater than 3.5, build-up is not formed.
| Type of Work: | Thesis (Doctorates > Eng.D.) | |||||||||
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| Award Type: | Doctorates > Eng.D. | |||||||||
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| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Chemical Engineering | |||||||||
| Funders: | None/not applicable | |||||||||
| Subjects: | T Technology > TP Chemical technology | |||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/6851 |
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