Rotary folding arrangement

Claim 1

A FOLDING METHOD FOR WRAPPING A FILM SHEET IN A POROUS PAPER COMPRISING THE STEPS OF: DEVELOPING A FLOW OF SEPARATE AND CONSECUTIVELY NONOVERLAPPING FILM SHEETS; CONVEYING ALTERNATE FILM SHEETS IN SEPARATE BUT SYMMETRICAL PATHS; LAYING A TRAILING PORTION OF A WRAPPING PAPER OVER EACH OF THE FILM SHEETS DURING TRAVERSAL OF THE PATHS WITH THE LEADING PORTION OF THE PAPER BEING OF A LENGTH SUBSTANTIALLY EQUAL TO THAT OF THE FILM SHEETS; TRANSFERRING THE COMPOSITE SHEET AND PAPER TO A NEXT CONVEYOR MEANS SO THAT THE FILM SHEET OVERLAYS THE PAPER; CONVEYING THE COMPOSITE FILM SHEET AND PAPER TOWARD A FOLDING REGION; DIVERTING BY MEANS OF A SUBSTANTIALLY REDUCED FORCE THE LEADING PORTION OF EACH RESPECTIVE PAPER TO THE MIDDLE THEREOF IN A DIRECTION SO THAT IT PARTIALLY OVERLAPS THE FILM SHEETS; AND DETECTING THE DIVERTED ALTERNATE LEADING PORTIONS AT A LOCATION NORMALLY HAVING AT LEAST ONE LEADING PORTION PRESENT.