1:DZ500 Double Chamber Vacuum Packing Machine 2:CE Verified 3:High Quality,Low Cost 4:Easy to Operate 5:Prompt Delivery Vacuum Packing MachineDZ-500/2SB Vacuum Packing Machine, vacuum pillow packing machine, food vacuum packing machine Working principle :Vacuum packaging machine, just need to press the vacuum cover complete after vacuum filled with inert gases, sealing, lettering, cooling and ...