| 摘要 |
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 < Tl, said second heating area extending over the area inscribed in said first ring (61) at the temperature Tl; characterized in that said mold (6) comprises - a matrix n of heating elements (7, 7,...7) and in that - means (8) are provided for selectively controlling the power of each of said heating elements (7, 7,...7). |
