Importance

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Abstract

A substrate coating apparatus is disclosed. The substrate coating apparatus comprises a substrate holder for holding a substrate vertically; a piston for introducing, by pushing or injecting, a liquid comprising a catalyst component into the substrate via or through open ends of the plurality of channels at a lower end of the substrate; a vacuum generator for applying a vacuum to open ends of the plurality of channels at an upper end of the substrate; and a fluid feed ring for supplying the liquid onto a face of the piston. The fluid feed ring comprises an annular body comprising an inner face bounding a central bore of the fluid feed ring; a fluid feed port for receiving the liquid; a plurality of outlet apertures on the inner face of the annular body for discharging the liquid onto the piston face; and a distribution channel extending at least part-way around the annular body which provides fluid communication between the fluid feed port and the plurality of outlet apertures.

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First Claim