A heat-welding machine for welding a covering film on a perimeter adge of trays destined for product packaging

摘要

A heat-welding machine for welding a covering film on trays (100) provided with a perimeter edge (102) which is substantially flat, comprising: a horizontally-lying support frame (2) on which the perimeter edge (102) of a tray (100) rests, the tray (100) being arranged with a concavity thereof facing upwards; a dispensing reel (3) of a band (30) of covering film having a greater width than a width of the tray (100) situated in the support frame (2), an initial tract of an integral part of the band (30) being pulled onto the tray (100); a heated plate (4) for pressing the initial tract of the integral part of the covering film downwards onto the perimeter edge (102) of the tray (100) in order to weld the covering film thereon; means for cutting (40) for acting on the initial tract of the integral part of the band (30) of covering film, in order to separate a portion of the band (30) having a smaller width than the width of the band (30), and leaving a continuous waste (31) formed by two lateral strips (31') which remain attached to the band (30); and a take-up roller (5) of said lateral strips (31') which rotates and advances the initial tract of the integral part of the band (30) of covering film above the tray (100) located in the support frame (2).