Method for coating a filter substrate

Patent metadata

Field	Value
Publication number	US-10814318-B2
Application number	US-201515509752-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 25, 2014
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

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

First claim

The invention claimed is:

1. A method of coating a filter substrate comprising a plurality of channels, wherein each channel has an open end and a closed end, which method comprises the steps of:
(a) depositing a pre-determined amount of a liquid into a containment means at an upper end of the filter substrate using a shower head, wherein the shower head comprises a plurality of apertures arranged to dispense the liquid onto an upper end face of the filter substrate, and wherein the liquid has a viscosity of ≤600 mPa·s as measured at 20° C. on a Brookfield™ RV DVII+ Extra Pro viscometer using a SC4-27 spindle at 50 rpm spindle speed; and
(b) coating the channels having open ends at the upper end of the filter substrate with pre-determined amount of the liquid from the containment means by applying a vacuum to a lower end of the filter substrate to draw the liquid along the channels having open ends at the upper end of the filter substrate.

2. A method according to claim 1 , wherein the liquid has a viscosity of ≤500 cP at a shear rate of 20 s −1 as measured at 20° C. on a Brookfield RV DVII+ Extra Pro viscometer using a SC4-27 spindle at 50 rpm spindle speed.

3. A method according to claim 1 , wherein the liquid has a viscosity of 10 to 100 cP as measured at 20° C. on a Brookfield RV DVII+ Extra Pro viscometer using a SC4-27 spindle at 50 rpm spindle speed.

4. A method according to claim 1 , wherein the pre-determined amount of the liquid is a pre-determined volume of the liquid.

5. A method according to claim 1 , wherein the pre-determined amount of the liquid is a single dose of the liquid.

6. A method according to claim 1 , wherein the containment means comprises a sealing means for preventing the liquid from flowing from the upper end face of the filter substrate and onto an exterior side surface of the filter substrate, wherein the sealing means comprises at least one inflatable collar.

7. A method according to claim 1 , wherein the containment means comprises a template for covering an area or areas of an upper end face of the filter substrate.

Assignees

• Johnson Matthey Plc

Inventors

• Arulraj Kaneshalingham
• Bhantoo Jenita
• Savage Jamie
• Smith Andrew
• Wang Lifeng
• Yokota Daisuke

Classifications

• F01N3/208

  Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title

• F01N3/28

  Construction of catalytic reactors · CPC title

• F01N3/022

  characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous · CPC title

• C04B41/00

  After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone (conditioning of the materials prior to shaping C04B40/00; applying liquids or other fluent materials to surfaces, in general B05; grinding or polishing B24; apparatus or processes for treating or working shaped articles of clay or other ceramic compositions, slag or mixtures containing cementitious material B28B11/00; working stone or stone-like materials B28D; glazes, other than cold glazes, C03C8/00; etching, surface-brightening or pickling compositions C09K13/00) · CPC title

• B01D37/02 Primary

  Precoating the filter medium; Addition of filter aids to the liquid being filtered {(devices for feeding reagents C02F1/685 and sub-groups; filter aids)} · CPC title