Sandpaper

Claim 1

AN ABRASIVE PAPER WHICH COMPRISES A REINFORCED PAPER BACKING WEB, A LAYER OF GRIT SUPPORTING MAKING VARNISH ON ONE SIDE OF SAID PAPER WITH A MULIPLICITY OF ABRASIVE GRITS INBEDDED IN SAID VARNISH, AND A FLEXIBLE BARRIER MATERIAL PREVENTING THE MAKING VARNISH FROM PENETRATING SUBSTANTIALLY INTO THE BACKING, SAID BARRIER MATERIAL BEING COMPATIBLE WITH BOTH THE BACKING AND THE MAKING VARNISH AND BONDING THE BACKING TO THE VARNISH, SAID WEB COMPRISING A CONTINUOUS NETWORK OF KRAFT-TYPE WOODPULP FIBERS ARRANGED IN OVERLAPPING CROSSING RELATIONSHIP WITH ONE ANOTHER SO AS TO DEFINE A MULTIPLICITY OF INTERSTICES BETWEEN THEM, AND A MULTIPLICITY OF FLEXIBLE AND TOUGH THERMOPLASTIC REINFORCING MEMBERS DISTRIBUTED SUBSTANTIALLY UNIFORMLY THROUGHOUT THE WEB IN BONDING RELATION WITH THE WOOD-PULP FIBERS, SAID REINFORCING MEMBERS BEING BETWEEN ABOUT 1 AND 35 MILS IN CROSS DIMENSION AND AT LEAST ABOUT FIVE TIMES LARGER IN CROSS-SECTIONAL AREA THAN SAID WOODPULP FIBERS AND DEFINING A MULIPLICITY OF SPACES BETWEEN SAID MEMBERS, THE AVERAGE DISTANCE ACROSS THE SPACES BETWEEN THE REINFORCING MEMBERS BEING CONSIDERABLY GREATER THAN THE AVERAGE DISTANCE ACROSS THE INTERSTICES BETWEEN THE WOODPULP FIBERS WHEREBY SEVERAL OF SAID INTERSTICES GENERALLY ARE LOCATED IN EACH OF THE SPACES BETWEEN THE REINFORCING MEMBERS.