Thermo-welder for the sealing of bags and sacks of various dimensions, in two or three layers (polyester, aluminum and polyethylene). For sealings in atmosphere or under vacuum. The conveyor belt lifts and lowers electrically according to the bags height; it carries the bags upright up to the welding elements. The welding elements guarantee a perfect and uniform seal, with hot-printing of the expiry date up to 16 characters.

The welding-bars can be easily and quickly opened for cleaning or date-changing operations. To guarantee a perfect and uniform seal, either temperature-values and welding-times can be set independently. It is also possible to regulate vacuum time. Machine for “bricks” vacuum packs or packs in atmosphere.