Abstract:
There is disclosed a device (1) for sealing a film material (2) to the frame (3) of a tray (4), which comprises: - means (5) for feeding a film material (2); - a vertically movable mold (6) for heat-sealing said film material (2) to the frame (3) of at least one tray (4), said mold (6) being adapted to create - a first heating area (61), for heating said film material (2) to an average temperature Tl, said first heating area extending over a first ring; - a second heating area (62), for heating said film material (2) to an average temperature T2