Fast homogenous coating process
AssigneeUmicore AG & Co. KG
InventorsStéphane Masson, Celio Malentaque
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a process for the production of exhaust catalysts. In particular, the process describes a way of coating a substrate in a manner which finally leads to reduced coating times.
Claims13
A process for coating a substrate with liquid coating media, against the force of gravity, for the production of an exhaust gas purification catalyst, which has an upper end face, a lower end face, an axial length L, and is traversed from the lower end face to the upper end face by a multiplicity of channels,
- wherein the introduction of the liquid coating medium into the substrate from below is controlled in such a way that the coating speed from part of the axial length towards the upper end face of the substrate is reduced compared to the speed at the initial introduction of the liquid coating medium into the lower end face of the substrate, and
- wherein the height of the liquid coating medium in the coating chamber is checked by sensing before the liquid coating medium enters the substrate, and
- the coating speed at the beginning of the introduction of the liquid coating medium is above or equal to 0.1 m/s, and
- the reduction in speed of introduction of the liquid coating medium into the lower end face of the substrate is started after at least half of the length L of the substrate is wetted with the liquid coating medium, and with the reduction in the speed of introduction occurring prior to initiation of liquid coating medium supply flow shut off into the lower end face of the substrate.
A process for coating a substrate with liquid coating media, against the force of gravity, for the production of an exhaust gas purification catalyst, which has an upper end face and a lower end face, an axial length L, and is traversed from the lower end face to the upper end face by a multiplicity of channels,
- wherein the introduction of the liquid coating medium into the substrate from below is controlled with a controller in such a way that the coating speed from a portion of the axial length prior to the upper end of the substrate is reduced compared to the speed at the initial introduction of the liquid coating medium into the lower end of the substrate, and
- wherein the liquid coating medium height in the coating chamber is checked by sensing before the liquid coating medium enters the substrate, and
- the coating speed at the beginning of the introduction of the liquid coating medium is above or equal to 0.1 m/s and follows a coating speed reduction profile determined by the controller, and
- wherein a lower end point of the coating speed reduction profile determined by the controller is reached prior to initiation of a stoppage of introduction of the coating medium supply to the substrate.
Dependencies are inferred from the claim text.