Abstract Apparatus for coating a surface of an earthed substrate with powdered material comprising an earthed dispensing rotor to direct powdered material towards the substrate successively through two electrically conducting screens, which are disposed between the dispensing means and the substrate, the screens nearer to the substrate being electrostatically charged, the screen nearer to the dispensing means being electrically isolated and having in operation an electrical charge induced therein. The rotor has a fluid-permeable curved wall structure filled with porous material the outer periphery of the wall having packets sequentially supplied with powder, fluid being supplied to a portion of the inner periphery which at any moment is angularly spaced from the pockets being supplied with powder.
Inventors
👤 Albert Edward Jackson
👤 Robert Gordon Russell
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 09:12
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/02; B22F7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
24 words
Apparatus as claimed in claim 1 wherein the screen nearer to the substrate is disposed substantially midway between the latter and the dispensing means.
Claim 2
Dependent Claim
25 words
Apparatus as claimed in claim 1 wherein the screen nearer to the dispensing means is substantially nearer to the latter than to the other screen.
Claim 3
Dependent Claim
32 words
Apparatus as claimed in claim 1 wherein the means for charging the screen nearer to the substrate charges the said screen at a positive or negative potential of at least 20 kv.
Claim 4
Dependent Claim
38 words
Apparatus as claimed in claim 1 in which the means to cause the powdered material to travel towards the substrate comprises means to employ fluid pressure to force the powdered material from the dispensing means towards the substrate.
Claim 5
Dependent Claim
30 words
Apparatus as claimed in claim 5 wherein the dispensing means comprises a rotor provided with peripheral pockets, powder supply means being provided for supplying the said pockets with powdered material.
Claim 6
Dependent Claim
78 words
Apparatus as claimed in claim 6 wherein the rotor has a fluid-permeable curved wall structure whose outer periphery is provided with the said pockets, a fluid conduit being disposed within and sealed to the inner periphery of the curved wall structure, the portion of the curved wall structure which, at any moment, receives powdered material from the powder supply means being angularly spaced from the portion of the curved wall structure which receives fluid from the fluid conduit.
Claim 7
Dependent Claim
20 words
Apparatus as claimed in claim 1 when used to deposit a coating of the powdered material onto a moving strip.