Method of and device for forming heat sealable blanks into box shape

Claim 1

THE METHOD OF HANDLING A BLANK OF PAPERBOARD COMPRISING A BOTTOM, FRONT AND BACK WALLS ARTICULATED TO SAID BOTTOM, CORNER FLAPS ARTICULATED TO SAID WALLS, AND END PANELS ARTICULATED TO SAID BOTTOM, SAID BLANK COMPRISING AREAS ON BOTH SURFACES AT WHICH A HEAT SEALABLE PLASTIC COATING IN PREAPPLIED, IN A MACHINE FOR FORMING THE BLANK INTO THE BOX SHAPE AND ADHERING BLANK PORTIONS AT THE SAID AREAS, THE MACHINE COMPRISING A BLANK MAGAZINE, A FORMING DIE, A FEEDER FOR CARRYING INDIVIDUAL BLANKS FROM THE MAGAZINE TO THE DIE AND A PLUNGER FOR FORCING THE BLANK THROUGH THE DIE, THE METHOD COMPRISING: APPLYING FROM ONE SIDE OF THE BLANK HEAT TO THE BONDING AREAS OF THE END PANELS WHILE THE BLANK IS BEING TRANSPORTED BY SAID FEEDER FROM THE MAGAZINE TO THE DIE; DEPOSITING SAID BLANK ABOVE THE MOUTH OF THE DIE AND APPLYING FROM THE OTHER SIDE OF THE BLANK HEAT TO THE BONDING AREAS OF THE CORNER FLAPS WHILE THE BLANK IS SUBSTANTIALLY AT REST ABOVE SAID MOUTH; THEN ENGAGING THE BLANK BY THE PLUNGER AND FOLDING FIRST THE SAID WALLS AND FLAPS AGAINST THE PLUNGER AND THEN FOLDING THE END PANELS INTO CONTACT WITH SAID FLAPS; THEN PASSING THE FLAPS AND PANELS WHILE THE BOX IS STILL ON THE PLUNGER THROUGH THE NIP OF A PAIR OF ROLLERS; AND THEN WITHDRAWING THE PLUNGER FROM THE BOX AT A POINT BEYOND THE NIP.

Claim 2

THE METHOD OF HANDLING A BLANK OF PAPERBOARD COMPRISING A BOTTOM, FRONT AND BACK WALLS ARTICULATED TO SAID BOTTOM, CORNER FLAPS ARTICULATED TO SAID WALLS, AND END PANELS ARTICULATED TO SAID BOTTOM, SAID BLANK COMPRISING AREAS ON BOTH SURFACES AT WHICH A HEAT SEALABLE PLASTIC COATING IN PREAPPLIED, IN A MACHINE FOR FORMING THE BLANK INTO THE BOX SHAPE AND ADHERING BLANK PORTIONS AT THE SAID AREAS, THE MACHINE COMPRISING A BLANK MAGAZINE, A FORMING DIE, A FEEDER FOR CARRYING INDIVIDUAL BLANKS FROM THE MAGAZINE TO THE DIE AND A PLUNGER FOR FORCING THE BLANK THROUGH THE DIE, THE METHOD COMPRISING: APPLYING FROM ONE SIDE OF THE BLANK HEAT TO THE BONDING AREAS OF THE END PANELS WHILE THE BLANK IS BEING TRANSPORTED BY SAID FEEDER FROM THE MAGAZINE TO THE DIE; DEPOSITING SAID BLANK ABOVE THE MOUTH OF THE DIE AND APPLYING FROM THE OTHER SIDE OF THE BLANK HEAT TO THE BONDING AREAS OF THE CORNER FLAPS WHILE THE BLANK IS SUBSTANTIALLY AT REST ABOVE SAID MOUTH; THEN ENGAGING THE BLANK BY THE PLUNGER AND FOLDING FIRST THE SAID WALLS AND FLAPS AGAINST THE PLUNGER AND THEN FOLDING THE END PANELS INTO CONTACT WITH SAID FLAPS; THEN PASSING THE FLAPS AND PANELS WHILE THE BOX IS STILL ON THE PLUNGER THROUGH THE NIP OF A PAIR OF ROLLERS; AND THEN WITHDRAWING THE PLUNGER FROM THE BOX AT A POINT BEYOND THE NIP.