Title: Container coating method

Abstract: A method for coating a slender, cylindrical container with a thin, resinous coating by spraying powdered resin is disclosed. The technique involves spraying of finely divided resin particles entrained in a gas stream at a substantially uniform rate at a velocity of from about 20 ft/min. to about 1000 ft/min. from a nozzle. The container may be sprayed by directing a continuous flow of resin particles at an accurate, predetermined rate into the container to deposit a substantially uniformly distributed coating. Alternatively, a pulse of a predetermined quantum of resin may be sprayed into a container. The resin particles are caused to adhere to the container by preheating the container, by inducing an electrostatic charge on the resin particles, or a combination of both. The coating may be matured by preheating the container to a high temperature or by postheating the coated container at temperatures in excess of about 300.degree. F.

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Other info:

Inventors: Coucher, Robert G. (Salt Lake City, UT, US)

Application Number: 855960
Filing Date: 1977-11-30
Publication_date: 1979-08-07
Assignee: W. R. Grace & Co. (Cambridge, MA)
Primary Class(es): 427/183 427/181, 427/195, 427/233, 427/234, 427/239
Other Classes:
US Patent Ref:

2995463	Aug, 1961	Meister et al.	427/27.
3058443	Oct, 1962	Paton	118/622.
3065106	Nov, 1962	Rhodes	118/622.
3077857	Feb, 1963	Widner	118/622.
3186860	Jun, 1965	Jones	427/27.
3212914	Oct, 1965	Lyle et al.	427/27.
3388685	Jun, 1968	Price	118/622.
3422795	Jan, 1969	Smith	118/622.
3678336	Jul, 1972	Winkles	118/622.
3697313	Oct, 1972	Stumphauzer et al.	427/239.
3726711	Apr, 1973	Hogstrom	427/236.
3896602	Jul, 1975	Petterson	427/183.
3904930	Sep, 1975	Waldron	427/28.
3947617	Mar, 1976	Gerek et al.	427/34.
4025664	May, 1977	Gerek et al.	427/181.

Other Refs:
Primary Examiner: Beck, Shrive P.
Assistant Examiner:
Attorney: Trask & Britt