This carton liner poly bag sealer is designed for heat-sealing liners/bags in cartons. The sealer uncuffs the bag off the carton flaps, then folds it inwards from sides, vacuumizes the bag (only a light vacuum to prevent balloon forming), heat-seals the bag top and then folds it in the carton. This bag sealing machine reduces labor and material costs, is simple to operate and easy to adjust. High efficiency and labor saving.