Coating quality as affected by core particle segregation in fluidized bed processing

Abstract

ElsevierAtarés Huerta, LM.; Depypere, F.; Pieters, J.; Dewettinck, K. (2012). Coating quality as affected by core particle segregation in fluidized bed processing. Journal of Food Engineering. 113(3): 415-421. doi:10.1016/j.jfoodeng.2012.06.012 Elsevier Editorial System(tm) Abstract: Fluidized bed coating is an important technique in the food powder industry, where often particles of a wide size distribution are dealt with. In this paper, glass beads of different particle size distribution were coated with sodium caseinate in a top-spray fluid bed unit. Positron Emission Particle Tracking (PEPT) was used to visualize and quantify the particle motion in the fluidized bed. Confocal Laser Scanning Microscopy combined with image analysis were used to investigate the effect of core particle size and its distribution on the thickness and quality of the coating. Particle size significantly affected the thickness and quality of the coating, due to differences in the corresponding fluidization patterns, as corroborated by PEPT observations. As the particle size distribution becomes narrower, segregation is less likely to occur. This results in a thicker coating which is, however, less uniform compared to when cores of a wider particle size distribution are spray coated. Cover LetterCLSM is able to characterize microparticles and quantify the coating thickness.The thickness and quality of the coating was affected by the size of the particles PEPT findings supported these results Our results help understand particle motion patterns, coating thickness and quality *Highlights (for review) 14Tracking (PEPT) was used to visualize and quantify the particle motion in the fluidized bed. Confocal 15Laser Scanning Microscopy combined with image analysis were used to investigate the effect of core 16particle size and its distribution on the thickness and quality of the coating. Particle size significantly 17affected the thickness and quality of the coating, due to differences in the corresponding fluidization 18 patterns, as corroborated by PEPT observations. As the particle size distribution becomes narrower, 19segregation is less likely to occur. This results in a thicker coating which is, however, less uniform 20 compared to when cores of a wider particle size distribution are spray coated. 2122

A novel method for the analysis of particle coating behaviour via contact spreading in a tumbling drum: Effect of coating liquid viscosity

“…Andersson et al [35] used fluorescence microscopy to characterise pharmaceutical pellet thickness and variance between pellets. Confocal laser scanning microscopy (CLSM) has also been employed for determining coating thickness and uniformity [36,37]. For example, Depypere et al [37] used CLSM to investigate the effect of process settings and coating solution concentration on coating quality of protein coated microparticles in a fluidised bed.…”

Quality attributes and anthocyanin content of rice coated by purple-corn cob extract as affected by coating conditions

“…process conditions, material properties, affecting the coating process dynamics and quality of the resulting product, many attempts have been made to optimize the coating system, improving the reactor design and increasing material efficiency, as reviewed by Teunou and Poncelet (2002). For instance, Atarés et al (2012) investigated the effects of core materials on the layer growth mechanism as well as coating quality. In addition to core material properties, the effects of process variables on quality attributes were studied by Palamanit et al (2013).…”