Multiple exhausting heat sealing appts. for plastic film

The utility model relates to a heat sealing device used for plastic film bags, which comprises a feeding rolling wheel, a rolling wheel, a heat sealing wheel, and a discharging rolling wheel, wherein, the side of the feeding rolling wheel is provided with an air blowing mechanism which charges air in a plastic film barrel. The utility model adopts the air blowing mechanism which is arranged at a discharging end port, so the plastic film barrel can be charged with air by the air blowing mechanism, the plastic film barrel can carry out air multiple exhaust before the opening is sealed, and the opening of a processed plastic bag can be easily opened. In addition, the heat sealing wheel of the utility model is provided with a plurality of groups of heaters, so the adhesive firmness of the sealed opening of a plastic film bag can be guaranteed. The utility model is a multiple exhausting heat sealing device for plastic films, which has the advantages of reasonable structure, convenience, and practicability and ensures the good processing quality of plastic bags.