Method for coating the interior surface of a cylinder
AssigneePraxair Technology, Inc.
InventorGeorge A. Haldenby
Life of this patent
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Abstract
The present invention provides a method for coating the interior surface of a cylinder with a uniform, relatively thick layer of a polymeric material. The method includes the steps of dispersing a particulate polymeric material into the interior cavity of a cylinder. Any openings in the cylinder are then closed. The cylinder is then subjected to rotational movement while at the same time subjecting the cylinder to oscillation in a vertical plane. The polymeric material is then heated to a temperature above the melting point of the polymeric material, and maintained at that temperature for a time sufficient to coat the polymeric material onto the interior surface of the cylinder. The rotation and oscillation of the cylinder is then halted and the polymeric material is cooled.
Claims7
A method for coating the interior surface of a cylinder having an interior cavity and a threaded neck at one end, said method comprising the steps of:
- (a) dispersing a particulate polymeric material into said interior cavity of said cylinder;
- (b) closing the threaded neck of said cylinder with a plug body having an aperture and an ejector tube extending from the aperture, said aperture being closed with a removable rod inserted into said ejector tube, wherein said plug body is positioned on the lowermost threads of the threaded neck;
- (c) fitting said threaded neck of said cylinder with a threaded plug whereby said plug body, said ejector tube, and said removable rod are contained within said threaded neck and whereby escape of any gas formed during step (e) is prevented;
- (d) commencing rotation of said cylinder about a central axis and oscillation of said cylinder about a second axis which is horizontal and orthogonal to said central axis;
- and
- (e) heating said polymeric material to a predetermined temperature above the melting point of said polymeric material and maintaining said polymeric material at said predetermined temperature for a time sufficient to melt said polymeric material and to coat said polymeric material onto the interior surface of said cylinder, whereby a thick, pinhole free polymeric coating is formed on said interior surface of said cylinder.
Dependencies are inferred from the claim text.