Abstract: A washcoat showerhead for depositing a washcoat onto a face of a substrate comprises a housing having an inlet for receiving the washcoat, a showerhead plate and a baffle. The housing and showerhead plate define a showerhead cavity with the baffle located within the showerhead cavity. The showerhead plate has a plurality of nozzle apertures for discharging the washcoat towards the face of the substrate. The baffle comprises an impermeable central body and a plurality of arms extending from the impermeable central body, the plurality of arms defining a plurality of flow apertures circumferentially arranged around the impermeable central body.

Abstract: A method of coating a substrate with a washcoat using a substrate coating apparatus is disclosed. The method comprises locating the substrate below the washcoat showerhead; bringing the partition ring into contact with the face of the substrate to thereby define a central region of the face of the substrate which lies within an interior of the partition ring and a peripheral region of the face of the substrate which lies outside the partition ring; conveying washcoat from the source of the washcoat, along the conduit and through the washcoat showerhead; discharging the washcoat out of the nozzle apertures towards the face of the substrate, the showerhead plate of the washcoat showerhead discharging washcoat onto both the central region and the peripheral region of the face of the substrate.

Abstract: An apparatus of coating a filter substrate comprising a plurality of channels and an apparatus is disclosed. The apparatus comprises: (i) a containment means for receiving a pre-determined amount of the liquid; and (ii) a liquid dosing head arranged to dispense the pre-determined amount of the liquid into the containment means over an upper end of the filter substrate. The containment means is locatable at an upper end of the filter substrate; and the liquid dosing head comprises a plurality of apertures for dispensing the liquid onto the upper end of the filter substrate.

Abstract: A washcoat showerhead for depositing a washcoat onto a face of a substrate comprises a housing having an inlet for receiving the washcoat, a showerhead plate and a baffle. The housing and showerhead plate define a showerhead cavity with the baffle located within the showerhead cavity. The showerhead plate has a plurality of nozzle apertures for discharging the washcoat towards the face of the substrate. The baffle comprises an impermeable central body and a plurality of arms extending from the impermeable central body, the plurality of arms defining a plurality of flow apertures circumferentially arranged around the impermeable central body.

Abstract: A substrate coating apparatus comprises a source of a washcoat, a washcoat showerhead comprising a showerhead plate having a plurality of nozzle apertures for discharging the washcoat towards a face of the substrate located below the washcoat showerhead, a conduit fluidly connecting the source of the washcoat to the washcoat showerhead for supplying washcoat to the washcoat showerhead and a partition ring located between the washcoat showerhead and the face of the substrate. The partition ring is dimensioned to be smaller than the face of the substrate and the substrate coating apparatus is configured in use to bring the partition ring into contact with the face of the substrate to thereby define a central region of the face of the substrate which lies within an interior of the partition ring and a peripheral region of the face of the substrate which lies outside the partition ring.

Abstract: A method of coating a filter substrate comprising a plurality of channels and an apparatus therefor. The method comprises the steps of: (a) introducing a pre-determined amount of a liquid into a containment means at an upper end of the filter substrate; and (b) coating the channels having open ends at the upper end of the filter substrate with the liquid from the containment means.