2018
DOI: 10.1016/j.cherd.2018.02.022
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Evaluation of pellet cycle times in a Wurster chamber using a photoluminescence method

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Cited by 10 publications
(6 citation statements)
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“…Liquid bridge forces may also exist due to the remaining moisture content (up to 5% w /w) at the particle surface. The inter-particulate forces increase with decreasing particle size and weight (43), resulting in poor particle flow and the appearance of “dead zones” in the “down flow” bed (44). This, in turn, causes a further reduction in air distribution and particle sticking in this region.…”
Section: Discussionmentioning
confidence: 99%
“…Liquid bridge forces may also exist due to the remaining moisture content (up to 5% w /w) at the particle surface. The inter-particulate forces increase with decreasing particle size and weight (43), resulting in poor particle flow and the appearance of “dead zones” in the “down flow” bed (44). This, in turn, causes a further reduction in air distribution and particle sticking in this region.…”
Section: Discussionmentioning
confidence: 99%
“…The PAT system should capture a decreased coating yield and prolong coating time, however, as it turns out, both LOD change before and after coating (Table 1) and core size reduction between the end of spraying and end of drying were highest in the case of the P-Q experiment in comparison with other coating experiments. This leads to an assumption that in the case of the experiment with fewer pellets, where individual particle circulation times reduce [28], drying during the spraying phase is not as efficient as in other experiments, thus leading to a premature process end when particle size is monitored during the coating experiment.…”
Section: Evaluation Of the Coating Outcomes For Experiments With Modi...mentioning
confidence: 99%
“…According to the conclusions of existing studies, larger particles receive more coating and consequently have different properties (e.g., active ingredient content) [6,10,13,14]. There are several reasons for the differences in the amount of coating received, and they all contribute to different time distribution between two consecutive passes through the coating zone and the amount of coating that a particle receives during one pass which has predominant impact [11,15,16]. Due to the smaller ratio between the cross section and the mass, smaller particles accelerate faster and, as a result, pass the spraying area inside the draf tube in shorter time, and after exiting the cylinder, they fly higher and therefore circulate through the cylinder less often (longer circulation time).…”
Section: Introductionmentioning
confidence: 99%
“…In addition to the geometrical properties of the coating chamber, the evenness of the applied coating among particles can also be significantly influenced by the process parameters, namely the flow rate of fluidization air, the height of the gap between the distribution plate and the draft tube, pellets loading (the mass of the pellets that are coated), and the atomization air pressure [16,19]. According to Mann renewal theory, interparticle coating thickness variability reduces, if interparticle shadowing is reduced in the coating zone [11] if circulation time variability is low and number of coating cycles increases [15].…”
Section: Introductionmentioning
confidence: 99%
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