Measurement and quantification of caking in excipients and food products with emphasis on the non-homogeneous interaction with ambient moisture  

作　　者：Katrina Brockbank Brian Armstrong Jamie Clayton 

机构地区：[1]Freeman Technology Ltd,1 Miller Court,Severn Drive,Tewkesbury,Gloucestershire,GL208DN,UK

出　　处：《Particuology》2021年第3期75-83,共9页颗粒学报（英文版）

摘　　要：Whilst caking occurs via several different mechanisms,absorption and migration of moisture is frequently the most dominant mechanism within the food and pharmaceutical industry.Fully understanding the propensity to cake is important for minimising down-stream process issues,however most characterisation techniques assume that moisture induced caking occurs homogenously through the sample resulting in a uniformly caked powder bed.In this study,the effect of moisture induced caking on powder flowability was investigated using powder rheology.Several materials,including skimmed milk powder(SMP)and sulphated methyl ester(SME)were stored for several days under controlled humidity conditions.The flow energies,a measure of the resistance to flow,were measured at 24 h intervals using an FT4 Powder Rheometer.As the energy is measured as a function of the bed height,variations in the powder bed are also captured.The results demonstrated that caking does not always occur uniformly,instead a caked region(or crust)forms at the air-powder interface and then progresses through the powder bed.Furthermore,the strength of this caked region was shown to increase over several days before stabilising.

关 键 词：POWDER CAKING Crust formation Powder rheometry Relative humidity 

分 类 号：TF12[冶金工程—粉末冶金]