Coating apparatus and method
AssigneeUmicore AG & Co. KG
InventorsWolfgang Hasselmann, Stéphane Masson
Life of this patent
Estimating the term…
Abstract
The present invention is directed to an apparatus and a respective process, which can be used in the production of exhaust catalysts. In particular, the present apparatus is used in a process to supply the liquid coating slurry to substrates, like honeycomb monoliths.
Claims22
A substrate coating apparatus for the production of exhaust gas purification catalysts, which are cylindrical support bodies and each have two end faces, a circumferential surface and an axial length L and are traversed from the first end face to the second end face by a multiplicity of channels, and for contacting the support bodies with a liquid coating slurry;
- said apparatus comprises
- a holding unit for reversibly holding the support body vertically;
- a dosing unit for supplying the liquid coating slurry onto the top end face of the support body;
- a unit for applying a pressure difference versus the support body to introduce the liquid coating slurry into the support body;
- wherein
- the dosing unit comprises a diffusor in the form of a flexible membrane through which a quantity of the liquid coating slurry is dosed from a supply source by diffusing through the diffusor under pressure to achieve a desired dosing amount of the liquid coating slurry that is applied to an area of the top end face of the support body;
- and wherein the unit for applying a pressure difference is configured to introduce the liquid coating slurry into the support body subsequent to the dosing unit having provided the desired dosing amount onto the area of the top end face of the support body.
A substrate coating apparatus for the production of exhaust gas purification catalysts which comprise support bodies with first and second end faces and an axial length L, and are traversed from the first end face to the second end face by a multiplicity of channels, and for contacting the support bodies with a liquid coating slurry;
- said apparatus comprises
- a holding unit for reversibly holding the support body vertically;
- a dosing unit for supplying the liquid coating slurry onto the top end face of the support body;
- a unit for applying a pressure difference versus the support body to introduce the liquid coating slurry into the support body;
- and
- wherein the dosing unit comprises a diffusor in the form of a flexible membrane and a membrane support through which the liquid coating slurry is applied to an area of the top end face of the support body when applying a pressure to the liquid coating slurry, wherein the flexible membrane has a plurality of liquid slurry flow passageway through-holes with each having a central liquid slurry flow axis in common with respective liquid slurry flow passageway through-holes provided in the membrane support, and wherein the liquid coating slurry passageway through-holes of the flexible membrane are in a one-to-one relationship with the through-holes in the membrane support.
A substrate coating apparatus for the production of exhaust gas purification catalysts which comprise support bodies with first and second end faces and an axial length L, and are traversed from the first end face to the second end face by a multiplicity of channels, and for contacting the support bodies with a liquid coating slurry;
- said apparatus comprises
- a holding unit for reversibly holding the support body vertically;
- a dosing unit for supplying the liquid coating slurry onto the top end face of the support body;
- a unit for applying a pressure difference versus the support body to introduce the liquid coating slurry into the support body;
- and
- wherein the dosing unit comprises a diffusor in the form of a flexible membrane and a membrane support through which the liquid coating slurry is applied to an area of the top end face of the support body when applying a pressure to the liquid coating slurry, and wherein both the flexible membrane and the membrane support have a plurality of liquid coating slurry passageway through-holes that are arranged as to prevent liquid coating slurry contact with the through-holes in the membrane support during liquid coating slurry application through the flexible membrane and onto a top positioned end face of the support body.
Dependencies are inferred from the claim text.