Air-suspension coating in the food industry: Part II — micro-level process approach

• Published in: Powder technology Vol. 171; no. 1; pp. 34 - 45
• Main Authors: Werner, Stephen R.L., Jones, Jim R., Paterson, Anthony H.J., Archer, Richard H., Pearce, David L.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 12.01.2007; Elsevier
• Subjects: Agglomeration; Applied sciences; Biological and medical sciences; Chemical engineering; Coating; Exact sciences and technology; Fluidised bed; Fluidization; Food engineering; Food industries; Fundamental and applied biological sciences. Psychology; General aspects; Granulation; Micro-level; Miscellaneous; Review; Sintering, pelletization, granulation; Solid-solid systems; Agglomeration; Review; Coating; Granulation; Fluidised bed; Micro-level; Coating process; Coating material; Particle motion; Fluidization; Particle suspension; Droplet; Particle collision; Spreading; Food industry; Infiltration; Fluidized bed; Drying
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2006.08.015

A review of air-suspension particle coating concluded that, in order to speed product and process development, a phenomenological approach is necessary to develop generic guidelines for the selection of coating materials and process variables. This paper identifies 10 fundamental phenomena (micro-level processes) that occur during an air-suspension particle coating process: particle motion, atomisation, droplet–particle collision, droplet impact and adherence, droplet impact and spreading, infiltration, drying, film formation, layering and inter-particle agglomeration. Their relevance to the coating objectives is discussed and from these four are identified as key micro-level processes: drying, droplet impact and spreading, and stickiness which encompasses the two key micro-level processes of droplet impact and adherence and inter-particle agglomeration. It is believed that significant advances in particle coating research can be made through examination of these key micro-level processes. This paper identifies 10 fundamental phenomena (micro-level processes) that occur during an air-suspension particle coating process. It is believed that significant advances in particle coating research can be made through examination of four key micro-level processes: drying, droplet impact and spreading, and stickiness which encompasses the two key micro-level processes of droplet impact and adherence and inter-particle agglomeration. [Display omitted]