Apparatus and method for coating substrates with washcoats
AssigneeJohnson Matthey Public Limited Company
InventorKumarasen Muruyandy
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Abstract
An apparatus and a method for coating substrates with washcoats in which a substrate (10) is engaged with a headset (6) of a substrate coating apparatus (1) below a washcoat showerhead (5) are disclosed. The washcoat is discharged from the washcoat showerhead (5) onto an upper surface (12) of the substrate under control of a valve assembly (4) before being drawn through the substrate by use of a vacuum generator (7). The valve assembly (4) comprises an outlet valve movable between a closed state and an open state. The valve assembly (4) creates a pressure drop within an interior of the washcoat showerhead (5) when the outlet valve moves from its open state to its closed state.
Claims6
A method of coating a substrate with a washcoat, comprising the steps of:
- engaging the substrate with a headset of a substrate coating apparatus so as to locate an upper surface of the substrate below a washcoat showerhead of the substrate coating apparatus;
- conveying washcoat from a source of the washcoat towards the washcoat showerhead;
- using a valve assembly to control flow of the washcoat from the source into an interior of the washcoat showerhead;
- discharging the washcoat out of the washcoat showerhead onto the upper surface of the substrate;
- and
- drawing the washcoat through the substrate by applying a suction force to a lower surface of the substrate;
- wherein the valve assembly comprises an outlet valve movable between a closed state and an open state to control flow of washcoat into the interior of the washcoat showerhead and the valve assembly creates a pressure drop within an interior of the washcoat showerhead when the outlet valve moves from its open state to its closed state.
Dependencies are inferred from the claim text.