Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold...
Reexamination Certificate
2006-06-06
2006-06-06
Weisberger, Richard (Department: 3624)
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
C264S087000, C162S164400, C162S187000
Reexamination Certificate
active
07056460
ABSTRACT:
A process for making an improved gypsum/wood fiber board is described. Products resulting from the process are also described. The process comprises adding a diisocyanate, specifically methylenediphenyldiisocyanate (MDI) to an aqueous slurry of calcium sulfate material and cellulosic fibers, where the MDI is added as an emulsion stable in the conditions in which the slurry is maintained. The process further includes passing the MDI containing slurry onto a flat porous forming surface to form a filter cake; removing a substantial portion of the water from the filter cake through the porous surface; pressing the filter cake to form a board and remove additional water; and drying the board to remove the remaining free water.
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Barnes & Thornberg LLP
Lorenzen John M.
Ohlson Glenn W.
United States Gypsum Company
Weisberger Richard
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