Abstract For binding in face-contacting relation a pair of box panels coated with thermoplastic material, the machine and method of this invention utilize transport means for moving the box and panels along a predetermined path, positioning and holding means for moving one of the panels into a position of spaced relationship to the other of said panels and for holding the panels in spaced relation for a brief period of time, nozzle means interposed between the panels for directing a blast of hot air in the direction of the panels and at an angle so as to scavenge atmospheric air whereby the thermoplastic coating on the panels is quickly heated. Thereafter the panels are quickly and firmly forced into face-contacting relation while still under the influence of the stream of hot air, the panels being held together until a bond is established therebetween.
A machine according to claim 1 wherein the vertical sides of the tip of the nozzle converge toward the end of the nozzle and in the direction of movement of the box so as to direct a component of the blast in the direction of movement of the panels to be bonded.
Claim 2
Dependent Claim
43 words
A machine according to claim 1 wherein said positioning and holding means comprises a rotatable element having a peripheral velocity in the direction of movement of said transport means which is somewhat greater than the velocity of movement thereof along said predetermined path.