Importance

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Abstract

A method and apparatus (1) for applying a dry powder to a porous substrate (10):

a) locating the porous substrate (10) in a holder (2) such that an inlet face (11) is in communication with an inlet chamber (15) and an outlet face (12) is in communication with a vacuum generator;b) establishing a gas flow through the porous substrate (10) from the inlet face (11) to the outlet face (12) by using the vacuum generator to apply a pressure reduction to the outlet face (12);c) spraying the dry powder to entrain it in the gas flow and pass it through the inlet face (11) to contact a porous structure (13) of the porous substrate (10); andd) activating a ring air blade (30) to blow off dry powder accumulated on the inlet face (11), wherein the vacuum generator remains active during activation of the ring air blade (30) such that the dry powder blown off the inlet face (11) is entrained in the gas flow and passes through the inlet face (11) of the porous substrate (10).

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First Claim