Method for forming a serrated tearing edge with a hardened thermoplastic resin layer

Claim 1

THE METHOD OF FORMING A TEARING EDGE FOR SEVERING PAPER AND THE LIKE WHICH COMPRISES PROVIDING A FIBROUS SHEET FORMED WITH SERRATIONS ALONG AN EDGE, PRESSING A MARGINAL PORTION OF ONE FACE OF SAID SHEET IN A HAND EXTENDING FROM THE SERRATED EDGE OF THE SHEET TO AN AREA BELOW THE BASE OF THE SERRATIONS INTO A LAYER OF MOLTEN THERMOPLASTIC MATERIAL ON A CARRIER SURFACE, SAID LAYER OF ADHESIVE EXTENDING FROM AREAS BENEATH SAID FACE TO AREAS BEYOND SAID SERRATED EDGE, SAID PRESSING OPERATING TO DISPLACE PORTIONS OF SAID LAYER FROM BETWEEN SAID SHEET AND SAID CARRIER SURFACE AND CAUSE SAID PORTIONS TO FLOW TO A LEVEL ABOVE THE FREE SURFACE OF SAID LAYER INTO WETTING ENGAGEMENT WITH EDGE SURFACES OF THE SERRATIONS, SAID LAYER BEING FROM 1/8 TO 3/4 THE THICKNESS OF SAID SHEET, REMOVING SAID FACE PORTION FROM SAID LAYER WITH MOLTEN THERMOPLASTIC MATERIAL THEREON INCLUDING PORTIONS ON THE FACE OF SAID SHEET BELOW THE BASE OF THE SERRATIONS AND OTHER PORTIONS COVERING EDGE SURFACES AND ENDS OF THE SERRATIONS, AND COOLING SAID THERMOPLASTIC MATERIAL ON SAID SHEET TO SOLIDIFY IT TO A HARD BODY INCLUDING HARDENED EDGE SURFACES AND ENDS ON THE SERRATIONS AND HARDENED MATERIAL ON THE FACE OF THE SHEET SUPPORTING THE HARDENED RESIN ON THE EDGES AND ENDS OF THE SERRATIONS AGAINST STRESSES ENCOUNTERED IN TEARING SHEET MATERIAL AGAINST THE SERRATIONS.

Claim 2

THE METHOD OF FORMING A TEARING EDGE FOR SEVERING PAPER AND THE LIKE WHICH COMPRISES PROVIDING A FIBROUS SHEET FORMED WITH SERRATIONS ALONG AN EDGE, PRESSING A MARGINAL PORTION OF ONE FACE OF SAID SHEET IN A HAND EXTENDING FROM THE SERRATED EDGE OF THE SHEET TO AN AREA BELOW THE BASE OF THE SERRATIONS INTO A LAYER OF MOLTEN THERMOPLASTIC MATERIAL ON A CARRIER SURFACE, SAID LAYER OF ADHESIVE EXTENDING FROM AREAS BENEATH SAID FACE TO AREAS BEYOND SAID SERRATED EDGE, SAID PRESSING OPERATING TO DISPLACE PORTIONS OF SAID LAYER FROM BETWEEN SAID SHEET AND SAID CARRIER SURFACE AND CAUSE SAID PORTIONS TO FLOW TO A LEVEL ABOVE THE FREE SURFACE OF SAID LAYER INTO WETTING ENGAGEMENT WITH EDGE SURFACES OF THE SERRATIONS, SAID LAYER BEING FROM 1/8 TO 3/4 THE THICKNESS OF SAID SHEET, REMOVING SAID FACE PORTION FROM SAID LAYER WITH MOLTEN THERMOPLASTIC MATERIAL THEREON INCLUDING PORTIONS ON THE FACE OF SAID SHEET BELOW THE BASE OF THE SERRATIONS AND OTHER PORTIONS COVERING EDGE SURFACES AND ENDS OF THE SERRATIONS, AND COOLING SAID THERMOPLASTIC MATERIAL ON SAID SHEET TO SOLIDIFY IT TO A HARD BODY INCLUDING HARDENED EDGE SURFACES AND ENDS ON THE SERRATIONS AND HARDENED MATERIAL ON THE FACE OF THE SHEET SUPPORTING THE HARDENED RESIN ON THE EDGES AND ENDS OF THE SERRATIONS AGAINST STRESSES ENCOUNTERED IN TEARING SHEET MATERIAL AGAINST THE SERRATIONS.