Coated shaker screen apparatus and method

DETAILED DESCRIPTION I claim: 1.
A metal substrate comprising openings to form a screen, said substrate coated with a cured blend comprising from about 99 to 25 percent by weight poly(arylene sulfide) and from about 1 to 75 percent by weight fluoroethylene.
2.
A screen of claim 1 wherein said metal substrate is chosen from among perforated metal, expanded metal, and woven element screening.
3.
A coated substrate of claim 1 wherein said coating also comprises from about 1 to 40 percent titanium dioxide by weight based on said blend weight added to said blend.
4.
A method for separating drilling cuttings and gumbo from drilling fluid comprising: 1.
passing said drilling fluid containing drilling cuttings and gumbo onto a screen, said screen comprising a metal substrate having openings to form a screen, said substrate coated with a cured blend of poly(arylene sulfide) and polytetrafluoroethylene; 2.
passing said fluids through openings in said screen, said openings sized to retain solid particulate matter and gummy solids; and 3.
retaining said solid particulate matter and said gummy solids on said screen.
5.
A method of claim 4 wherein said cured blend of poly(arylene sulfide) and polytetrafluoroethylene also comprises from about 1 to 40 percent titanium dioxide by weight based on the weight of said blend.
6.
A method of claim 4 wherein said coating blend comprises from about 99 to 25 percent by weight poly(arylene sulfide) and from about 1 to 75 percent by weight polytetrafluoroethylene.




Description:
BACKGROUND OF THE INVENTION This invention relates to screens for separating solid particles from fluids or fluid slurries.
In one of its aspects this invention relates to coatings for separating screens.
In another of its aspects this invention relates to the separation of "gummy" material and larger solid particles from a fluid stream.
In one of its concepts this invention relates to the method of separation of larger solid particles and gummy material from circulating drilling mud by a separator screen coated with a coating to which the gummy material does not easily adhere, thereby allowing the gummy material to pass across the screen with the larger solid particles