| 摘要 |
According to the invention, the device comprises a welding press with two jaws 1, 3 each of which comprises two parts 6, 7, 13, 14, separated by a gap 4 or by a groove 12. The two parts 6, 7, of the jaw 1 carry supports made of silicone rubber 11 facing the flat ends of the parts 13, 14 of the jaw 3 heated by a heating device 16 controlled by a temperature-regulating probe 17 embedded in the jaw 3. A thermal insulator 15 which does not adhere to the plastic materials of the films 5 to be welded is housed in the groove 12 and has a U-shaped section in order that the end of a cutting blade 10, displaced in translation in the gap 4 may protrude into the groove 12 during the cutting of the films 5 between the two portions of the latter heat- welded between the compressed jaws 1, 3. Application to the manufacture of plastic bags. <IMAGE> |
