In the operation of a baghouse dust collector the thin coating, or dustcake, which develops on the surface of filter bags actually does much of the filtration, not just the filter media itself. When starting-up a new dust collection system or a baghouse with new bags it takes a period of time for a coating or dustcake to build up on the filter media. Therefore, fine particulate can bleed through the filter media before this dustcake can be developed.

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