| 摘要 |
The invention relates to a method for producing, in a rotary manner, sachets, pouches or envelopes made from polyethylene or polypropylene in the form of a film, bubble film, foam or a complex comprising one of these products, this being with or without the presence of self-adhesive materials facilitating closure or application; as well as to the rotary production machine for implementing the method, characterised in that it includes unrolling stations (1) (25), longitudinal welding shoes (4), a pre-heating device (5), revolving welding tools (6), a cooling device (16), ratio variators (22, 23, 24) and gears (36) intended to create slow and rapid moments by revolving. If welding/cutting is not obtained by a weld/burn, welding is followed by a distinct cutting. The invention is intended particularly for producing more elaborate sachets: by the addition of devices facilitating the removal of a tab (tongue) and by producing adhesiveness, since the assembly operates, at the same time, on the continuous advance of the material. <IMAGE> |
