Two ply printing paper and method of producing the same

Claim 2

A PRINTING PAPER IN WHICH IS AN UNCALENDERED SHEET HAVING A THICKNESS IN THE RANGE OF ABOUT 0.003" TO ABOUT 0.005" AND COMPRISING A PAIR OF SUPERIMPOSED SIZED CELLULOSIC PAPER WEBS, EACH WEB HAVING A MACHINE GLAZED SURFACE AND A ROUGH SURFACE, THE ROUGH SURFACES COMPRISING RIDGES AND VALLEYS AND THE MACHINE GLAZED SURFACES BEING SUBSTANTIALLY PLANAR, SAID WEBS THEIR ROUGH SURFACES CONFRONTING, AND A THIN LAYER OF ADHESIVE BONDING RIDGES OF THE ROUGH SURFACES TOGETHER AT THEIR AREAS OF CONTACT, SAID SHEET HAVING A BASIS WEIGHT OF BETWEEN ABOUT 28 TO 45 POUNDS (25" X 38" X 500 SHEETS) INCLUDING AN POUNDS, A PROPORTION OF THE VALLEYS OF THE ROUGH SURFACES BEING FREE OF ADHESIVE WHEREBY SAID VALLEYS DEFINE AIR SPACES WHICH CONTRIBUTE TO THE BULK OF THE SHEET, SAID GLAZED SURFACES EACH HAVING AN INGERSOLL GLARIMETER VALUE OF AT LEAST 38, SAID SHEET HAVING AN APPARENT DENSITY OF BETWEEN ABOUT 8,000 AND 13,000 AND A BAUSCH AND LOMB OPACITY OF AT LEAST 80.

Claim 3

IN THE PRODUCTION OF PRINTING PAPER HAVING A THICKNESS IN THE RANGE OF 0.003" AND 0.005" AND AN APPARENT DENSITY OF ABOUT 8,000 TO 13,000, THE STEPS OF PASSING A FIRST SIZED CELLULOSIC BASE WEB HAVING ROUGH SIDES AND A BASIS WEIGHT OF ABOUT 10-20 POUNDS PER REAM IN THE WET STATE TO A YANKEE DRIER, LEVELING ONE SIDE OF SAID BASE WEB BY PRESSING SAID WEB WHILE WETTED AGAINST THE SMOOTH SURFACE OF A YANKEE DRIER, DRYING THE WEB ON SAID SMOOTH SURFACE TO PROVIDE A MACHINE GLAZE SURFACE ON THE WEB ON THE DRIER SIDE WHILE THE OTHER SIDE REMAINS ROUGH, PASSING THE WEB WITHOUT REMOVAL FROM THE DRIER TO A NIP FORMED BETWEEN THE DRIER AND A BACKING ROLL, ADVANCING A SECOND AND SIMILAR DRY SIZED CELLULOSIC PAPER WEB HAVING ONE MACHINE GLAZE SURFACE AND ONE ROUGH SURFACE TO THE NIP IN SUCH MANNER THAT ROUGH SURFACES OF THE MACHINE GLAZED WEBS ARE IN CONFRONTING RELATION, APPLYING A THIN FILM OF AN ADHESIVE TO SAID SECOND WEB AS IT ADVANCES TO SAID NIP, ROLLING THE SAID WEBS WITH THE ADHESIVE THEREBETWEEN INTO A UNITARY SHEET WITHOUT IMPAIRMENT OF THE MACHINE GLAZE SURFACES OF THE WEBS, PASSING THE UNITARY SHEET ON THE YANKEE DRIER FOR A SHORT DISTANCE BEYOND THE NIP, AND THEN REMOVING THE SHEET IN A DRIED CONDITION FROM SAID DRIER.

Claim 4

IN THE PRODUCTION OF PRINTING PAPER HAVING A THICKNESS IN THE RANGE OF 0.003" AND 0.005" AND AN APPARENT DENSITY OF ABOUT 8,000 TO 13,000, THE STEPS OF PASSING A FIRST SIZED CELLULOSIC BASE WEB HAVING ROUGH SIDES AND A BASIS WEIGHT OF ABOUT 10-20 POUNDS PER REAM IN THE WET STATE TO A YANKEE DRIER, LEVELING ONE SIDE OF SAID BASE WEB BY PRESSING SAID WEB WHILE WETTED AGAINST THE SMOOTH SURFACE OF A YANKEE DRIER, DRYING THE WEB ON SAID SMOOTH SURFACE TO PROVIDE A MACHINE GLAZE SURFACE ON THE WEB ON THE DRIER SIDE WHILE THE OTHER SIDE REMAINS ROUGH, PASSING THE WEB WITHOUT REMOVAL FROM THE DRIER TO A NIP FORMED BETWEEN THE DRIER AND A BACKING ROLL, ADVANCING A SECOND AND SIMILAR DRY SIZED CELLULOSIC PAPER WEB HAVING ONE MACHINE GLAZE SURFACE AND ONE ROUGH SURFACE TO THE NIP IN SUCH MANNER THAT ROUGH SURFACES OF THE MACHINE GLAZED WEBS ARE IN CONFRONTING RELATION, APPLYING A THIN FILM OF AN ADHESIVE TO SAID SECOND WEB AS IT ADVANCES TO SAID NIP, ROLLING THE SAID WEBS WITH THE ADHESIVE THEREBETWEEN INTO A UNITARY SHEET WITHOUT IMPAIRMENT OF THE MACHINE GLAZE SURFACES OF THE WEBS, PASSING THE UNITARY SHEET ON THE YANKEE DRIER FOR A SHORT DISTANCE BEYOND THE NIP, AND THEN REMOVING THE SHEET IN A DRIED CONDITION FROM SAID DRIER.