... paper box and so on, FH-120 Semi-automatic hot melt Glue sealing machine (Spraying Glue)Feature:1. PLC automatically controller,frequency ... ,LED operating interface.2. inching and automatic can exchange,when there is no box, the machine don’t spray the glue.3 ... working of the machine is stable.Main function:People put box in the rail,testing by photoelectricity, then automatic coating the glue ...