Process of forming artificial board

Claim 1

THE PROCESS OF FORMING ARTIFICIAL BOARDS AND BOARDLIKE ARTICLES WHICH COMRPISES REDUCING CELLULOSIC MATERIAL TO FIBRES, MIXING THE FIBRES WITH WATER TO FORM A SLURRY, THOROUGHLY MIXING INTO THE SLURRY AN ALKALINE SOLUTION OF A WATER-SOLUBLE, THERMOSETTING, INTERMEDIATE CONDENSATION PRODUCT OF A PHENOL-ALDEHYDE RESIN IN THE PROPORTION OF ABOUT 3.5 PER CENT RESIN SOLIDS TO FIBERS AND ABOUT 0.5 PER CENT PARAFFIN SIZE BASED ON THE DRY WEIGHT OF THE FIBERS, AGITATING THE MIXTURE FOR AT LEAST ONE-HALF HOUR, ADDING AN ACID IN SUFFICIENT QUANTITY SUBSTANTIALLY TO NEUTRALIZE THE MIXTURE IN ORDER TO PRECIPITATE THE RESIN IN SITU AND SIMULTANEOUSLY ADDING SUFFICIENT ALUM TO COALESCE THE SIZE AND FIBERS, STRAINING THE WATER FROM THE SLURRY TO FORM A MAT OF ENTANGLED, RESIN-BEARING, SIZED FIBERS, AND COMPRESSING THE MAT WHILE HEATING IT TO FORM A FINISHED PRODUCT OF SIZED FIBRES AT LEAST PARTIALLY BOUND TOGETHER BY THE INFUSIBLE, INSOLUBLE, FINAL CONDENSATION PRODUCT OF THE RESIN.