Method of producing cellulosic pulp

Claim 1

AN IMPROVED PROCESS FOR PRODUCING HIGH WHITE PAPER STOCK FROM WOOD COMPRISING THE STEPS OF ADDING TO AN ALKALINE PROCESS COOKING LIQUOR HAVING A SODIUM HYDROXIDE CONCENTRATION OF 64 TO 80 GRAMS PER LITER AND A LIQUID TO SOLID RATIO OF 5 TO 1 TO 6 TO 1 A HYPOCHLOROUS ACID SALT 1% TO 2% BY WEIGHT OF THE WEIGHT OF THE WOOD OF BRINGING THE TEMPERATURE OF THE COOKING LIQUOR TO 155*C. TO 165*C. WITHIN ONE HOUR TO ONE HOUR AND A QUARTER, OF MAINTAINING SAID TEMPERATURE FOR A PERIOD OF ONE HOUR TO ONE HOUR AND A HALF, OF BLOWING THE DIGESTER, OF SCREENING THE PULP, OF SUBJECTING THE PULP TO A CHLORINATION BLEACH, OF WASHING THE PULP, OF SUBJECTING THE PULP TO A HOT SODIUM HYDROXIDE EXTRACTION, OF WASHING THE PULP, OF BLEACHING THE PULP IN A SOLUTION OF SODIUM HYPOCHLORITE EQUIVALENT TO 1% OF THE WEIGHT OF THE WOOD, AND OF WASHING THE PULP.