Coating processes – Interior of hollow article coating – Spraying
Patent
1982-03-08
1983-03-08
Hoffman, James R.
Coating processes
Interior of hollow article coating
Spraying
427 28, 427181, B05D 102, B05D 104, B05D 106, B05D 134
Patent
active
043761437
ABSTRACT:
A method and apparatus are disclosed for the spray-coating of the interior of a hollow body, one region of which, e.g. a seam, must receive a heavier coating than the remainder of the surface to be sprayed. A single spray coating operation is performed, in which a relatively heavy spray jet is concentrated on the seam and a relatively thin cloud of coating material is used to coat the entire interior surface of the body. Preferably, a cloud of electrostatically charged coating material is formed by an atomizer fed by a feed conduit from which a certain amount of coating material is diverted to be formed into the relatively highly concentrated spray jet directed at the seam. The relatively high-velocity particles of material of the spray jet which is concentrated onto the seam and the relatively low-velocity particles of material of the coating cloud together produce on the seam a thinner layer of material than would normally suffice and which, nonetheless, adheres well.
REFERENCES:
patent: 3081947 (1963-03-01), Walter
patent: 3248606 (1966-04-01), Faser
patent: 3422795 (1969-01-01), Smith
patent: 3678336 (1972-07-01), Winkless
Gema AG Apparatebau
Hoffman James R.
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