Method of making rolled phenolic resinbonded paper tubing

Claim 1

IN THE PROCESS OF PREPARING ROLLED PHENOLIC RESINBONDED PAPER TUBING, THE STEPS COMPRISING IMPREGNATING A SHEET OF PAPER WITH A PHENOLIC RESIN VANISH OF A VISCOSITY FROM 200 TO 400 CENTIPOSES, THE VANISH COMPRISING A MIXTURE OF FROM 30% TO 70% BY WEIGHT OF A PHENOLIC RESIN DISSOLVED IN A VOLATILE ORGANIC SOLVENT AND THE SOLUTION BEING OF A VISOCITY OF FROM 200 TO 350 CENTIPOSES, AND FROM 70% TO 30% BY WEIGHT OF A PHENOLIC RESIN DISSOLVED IN WATER AND THE SOLUTION BEING OF A VISCOSITY OF FROM 200 TO 500 CENTIPOSES, EACH OF THE PHENOLIC RESIN SOLUTIONS FORMING THE MIXTURE CONTAINING OVER 40% RESIN SOLIDS, THE VANISH MIXTURE AFTER HAVING BEEN APPLIED BEING SCRAPPED OFF ONE FACE OF THE SHEET OF PAPER, THE TREATED SHEET OFF ONE FACE TO EVAPORATE THE ORGANIC SOLVENT AND THE WATER AND TO ADVANCE THE PHENOLIC RESIN TO THE B STAGE, THE WEIGHT OF THE APPLIED PHENOLIC RESIN EQUAL TO 100% TO 150% OF THE WEIGHT OF THE PAPER, THE PHENOLIC RESIN THOROUGLY IMPREGNATING THE PAPER, WRAPPING THE TREATED SHEET OF PAPER ON A MANDREL WITH THE SCRAPED SIDE BEING DOWN TO FORM A TUBULAR STRUCTURE, AND HEATING THE MANDREL WITH THE WRAPPED SHEET THEREON TO BOND THE PAPER TOGETHER AND TO CONVERT THE PHENOLIC RESIN TO THE INFUSIBLE INSOLUBLE STAGE, THE RESULTING TUBE WHEN REMOVED FROM THE MANDREL HAVING A DENSITY OF OVER 1.30.