Appeal No. 95-4984
Application No. 08/038,369
15. A process of coating a given surface of a heat sensitive
metal article with a curable powder coating, comprising the
steps:
elevating the metal article's temperature in an oven to a
selected temperature;
maintaining the metal article at approximately said selected
temperature for a first period of time;
withdrawing the metal article from the oven;
spraying said curable powder coating onto said given surface
of the metal article, said spraying being initiated
essentially immediately after withdrawal of the metal
article from the oven, said spraying comprising first and
second spray sequences, said first spray sequence
applying a coating layer having a thickness chosen to be
adequate to fill pores in said given surface with said
curable powder coating, said second spray sequence
building up a total thickness of said curable powder
coating resulting from both the first and second spray
sequence to a total coating thickness over said given
surface of the metal article;
re-elevating the metal article's temperature in said oven to
said selected temperature;
maintaining the metal article at approximately said selected
temperature for a second period of time;
said selected temperature, said first period of time, and said
second period of time being chosen based upon
experimentally determined data which defines a curve
plotting temperature versus time of heating for which the
metal article retains a percentage of its non-heated
tensile and yield strength characteristics after
undergoing a plurality of heating/ cooling processes
involved in at least two individual instant processes of
coating;
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