Method of adhesively bonding foldable board

Claim 1

THE METHOD OF SECURING TOGETHER IN FACE-TO-FACE RELATIONSHIP AREAS OF TWO SURFACES OF BOARD OF A FOLDING BOX BLANK, THE METHOD COMPRISING, THE STEPS OF APPLYING TO ONE OF SAID AREAS AN AQUEOUS EMULSION OF A THERMOPLASTIC ADHESIVE, THEN PRESSING SAID ADHESIVE COATED ONE AREA AGAINST A SECOND AREA OF A SURFACE TO WHICH SAID FIRST AREA IS TO BE ADHERED, THEREBY TRANSFERRING ADHESIVE EMULSION FROM SAID ONE AREA TO SAID SECOND AREA, THEN SEPARATING SAID TWO AREAS, THEN APPLYING HEAT TO THE ADHESIVE ON SAID FIRST AND ON SAID SECOND AREA, WHILE SAID AREAS ARE SEPARATED, TO RAISE THE TEMPERATURE OF THE ADHESIVE ABOVE THE BOILING POINT OF WATER TO A POINT SUFFICIENT TO FUSE THE ADHESIVE COMPONENT, THEREBY CONVERTING THE ADHESIVE COMPONENT FROM ITS DIVIDED EMULSION STATE OF LOW TACKINESS INTO A CONTACT-TYPE ADHESIVE OF HIGH TACKINESS, AND THEN PRESSING THE ADHESIVE COATED AREAS TOGETHER, WHEREBY AN INSTANTANEOUS CONTACT-TYPE BOND IS FORMED.