COATING TOOL

Abstract

This application concerns a tool for coating a monolithic shaped catalyst. The tool is part of a coating station and serves to hold and fix the monolith while coating is progressing.

Claims

1. Coating tool comprising: a first means (1) for reversible holding and fixing a catalyst monolith to be coated with a washcoat; a second means (2) to control the inflow of the washcoat into the monolith; said second means (2) being attached to said first means (1) such that during the coating process said second means (2) comes into contact with the washcoat before it reaches the monolith; said second means (2) having the form of a plate comprising holes (3) having, when in use, an inlet side towards the washcoat and an outlet side towards the monolith, and channels providing a communication from the inlet side to the outlet side for the washcoat to flow through; wherein at least part of said channels have an asymmetric channel width along their axis being wider at the washcoat inlet side than at a point within the channels and wherein said asymmetric holes (3) are wider at the washcoat outlet side than at a point within the channels and the area which is more narrow than outlet and inlet of the holes (3), is at least for some of the holes (3) aligned more closely to the outlet than to the inlet side.

2. Tool according to claim 1, wherein the area which is more narrow than outlet and inlet of the holes (3) forms a cylindrical surface to the inner periphery of the channels and being located within the second half of the channels seen from the inlet side.

3. Tool according to claim 1, wherein said second means (2) comprises a concentrical area having a smaller diameter compared to the diameter of the second means (2) itself and being attached thereto; said area being a disk (4) perforated by holes (10).

4. Tool according to claim 1, wherein at least one hole (3) having asymmetric channel width being wider at the washcoat inlet side than at a point within the channels is prepared to receive a sensor finger (6) for monitoring the execution of the coating process.

5. Tool according to claim 1, wherein said first means (1) comprises an inflatable bellow (5) which is able to reversible hold and fix the monolithic carrier body through inflating and deflating the bellow (5).

6. Tool according to claim 5, wherein the bellow (5) is fixed to the first means (1) by air-tight engagement on an upper side (7) and a lower side (8) of the first means (1) while the thus formed bellow is open to the side of the first means (1).

Description

[0042] FIG. 1 shows the tool from the monolith (outlet) side

[0043] FIG. 2 shows top-side view on the tool

[0044] FIG. 3 displays bottom-side view on the tool

[0045] FIG. 4 reflects bottom view on tool

[0046] FIG. 5 shows side cut view of tool

[0047] FIG. 6 depicts zoomed side cut view of preferred bellow region

[0048] FIG. 7 depicts zoomed side cut view of preferred bellow region

[0049] FIG. 8 time saving through application of tool for three different products; pass 1 means that the monolith is coated 1 time; pass 2 indicates that coating is done 2 times

[0050] FIG. 9 side cut of monolith body coated with diffusor tool

[0051] FIG. 10 shows part of the coating station with coating chamber

[0052] FIG. 11 Prior art design of diffusors and inventive design used for calculation

[0053] FIG. 12 Result of calculation showing preferable behavior of the inventive design over the prior art design