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A novel method for assessing the coating uniformity of hot-melt coated particles using micro-computed tomography

  • The effectiveness of hot-melt coating depends on its uniformity and the extent to which the surface is completely covered. Compared with solvent-based coating, spreading is more limited in hot-melt coating; thus, the coating uniformity is more affected by the process parameters. This study presents a new method for identifying and quantifying factors influencing coating uniformity. The proposed method facilitates the determination of coating-thickness distribution and non-covered surface proportion based on micro-computed tomography measurements. The proposed method is based on particles that have undergone hot-melt coating in a fluidized bed, and it is compared to common methods for layer-thickness determination. The influencing factors are quantified in terms of the dependency of coating uniformity on the coating amount and material. Material properties have a significant impact because stearin and palm fat create different coating layers. The proposed method is confirmed to be well suited for analyzing coating qualities.

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Author:B.M. Woerthmann, Johannes A. Lindner, T. Kovacevic, P. Pergam, F. Schmid, H. Briesen
URL:https://doi.org/10.1016/j.powtec.2020.09.065
Parent Title (English):Powder Technology
Document Type:Article (peer reviewed)
Language:English
Publication Year:2021
Tag:Coating uniformity; Hot-melt coating; Layer-thickness distribution; Micro-computed tomography; Wurster fluidized bed
Volume:378
Issue:Part A
First Page:51
Last Page:59
Peer reviewed:Ja