Abstract
In ‘barrier’ or ‘surface’ filters, a dust cake gradually builds up on the upstream side, with relatively little penetration of dust into the filter medium itself. The performance of such a filter — its rise in pressure drop during the filtration cycle, for example — is strongly influenced by the structure of the growing dust cake. This paper describes a method by which a loose dust layer may be ‘prepared’ for subsequent microscopic examination, which may yield quantitative data on its structure. The first part deals with the ‘fixation’ of the dust cakes, which is achieved in two separate steps. The second part describes the further treatment of the hardened cakes up to the point at which photographs can be taken.
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