The pneumatic sealing machines QF 600/800 LS are widely used in chemical industries, food industries, animal feed, etc. for sealing bags in plastic material of every kind, even of high thickness with max width of 600/800 mm and weight max of 50 kg. The use of compressed air to the closing of the sealing bars allows to adjust the welding pressure and ensures a high and constant quality, the closure of the bars takes place through double button (dual control of security). The welding machines QF-600/800 LS are installed on a stand with wheels and comes complete with height-adjustable idle roller conveyor for handling bags weighing up to 50 kg.