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Title: Application of spot colour measurement for the optimisation of colour coating
Authors: Heng, P.W.S. 
Chan, L.W. 
Chan, W.Y. 
Keywords: Colour coating
Colour variation
Fluidised bed
Tristimulus colorimeter
Issue Date: Nov-1999
Citation: Heng, P.W.S.,Chan, L.W.,Chan, W.Y. (1999-11). Application of spot colour measurement for the optimisation of colour coating. S.T.P. Pharma Sciences 9 (6) : 539-544. ScholarBank@NUS Repository.
Abstract: The colour coating of pellets was carried out in a bottom spray Wurster fluidised bed equipment. Coating quality could be affected by a number of operating variables. In this study, the relationship between process parameters and colour coat development was investigated by measuring a small area of colour coating on individual pellets using a tristimulus colorimeter. Colour coating was determined in terms of CIE (Commission internationale de l'eclairage) L*a*b* units, and colour difference (ΔE) values with respect to base-coated pellets were calculated. Standard deviations of colour difference (SD(ΔE)) values represented colour variations in pellet coatings sampled at different coating times. Higher SD(ΔE) values indicated a wider spread of ΔE values from the mean and hence, less uniformly distributed colour coating.
Source Title: S.T.P. Pharma Sciences
ISSN: 11571489
Appears in Collections:Staff Publications

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