Method of making impregnated corrugated paperboard sheets on a corrugator machine

Claim 1

IN THE PROCESS OF MANUFACTURING ON A CORRUGATOR MACHINE CORRUGATED PAPERBOARD IMPREGNATED WITH WAX IN WHICH A WAX RESIST WATERPROOF STARCH ADHESIVE IS APPLIED TO THE EXPOSED CRESTS OF THE CORRUGATED MEDIUM OF A SINGLE-FACE BOARD, MOLTEN PARAFFIN WAX IS APPLIED TO THE CORRUGATED MEDIUM OF THE SAID SINGLE-FACE BOARD AND IS PREVENTED BY THE RESIST CHARACTER OF SAID WATERPROOF STARCH ADHESIVE FROM DIRECTLY CONTACTING THE SURFACE OF SAID CRESTS, A SECOND LINER WEB IS CONTACTED AGAINST THE EXPOSED CRESTS OF THE CORRUGATED WEB AND HEAT IS THEN APPLIED TO AND THROUGH SAID LINER WEB TO ACTIVATE AND SET SAID WATERPROOF STARCH ADHESIVE; THE IMPROVEMENT WHICH PERMITS THE CONTINUOUS MANUFACTURE OF FULLY IMPREGNATED SHEETS OF DOUBLE-FACE CORRUGATED BOARD PAPERBOARD COMPRISING: (A) APPLYING MOLTEN PARAFFIN WAX TO THE LINER WEB OF THE SINGLE-FACE BAORD BEFORE SAID SINGLE-FACE BOARD IS COMBINED INTO DOUBLE-FACE BOARD, (B) APPLYING MOLTEN PARAFFIN WAX TO THE OUTER FACE OF THE SECOND LINER WEB AND ALLOWING SAID WAX TO STRIKE THROUGH TO THE INNER FACE OF THE SAID SECOND LINER WEB BEFORE THE SAID SECOND LINER WEB IS COMBINED INTO DOUBLE-FACE BOARD WITHOUT THEREBY IMPAIRING THE BONDING OF THE SAID LINER TO THE CRESTS OF THE FLUTES OF THE SINGLE-FACE BOARD, (C) TRIMMING THE EDGES OF THE SAID DOUBLE-FACE CORRUGATED PAPERBOARD WEB AFTER THE AFORESAID HEATING AND ADHESIVE-SETTING STEP HAS EFFECTED IMPREGNATION OF THE WAX THROUGHOUT THE THICKNESS AND WIDTH OF THE DOUBLE-FACE CORRUGATED PAPERBOARD WEB, AND (D) CUTTING SAID DOUBLE-FACE CORRUGATED PAPERBOARD WEB TRANSVERSELY INTO A SUCCESSION OF SHEETS.