Four corner sides carton sealer successful researched and developed, fill the blank of the requirements of special industries, especially for the industries which need ocean shipping. Features : Dust-proof, moisture proof, oxidation resistant, acid and alkali corrosion resistant, suitable for all size of packages, manually adjust height and width, 90 degrees turning device, auto pushed by cylinder; sealing from four corner sides simultaneously, could combine with GPA/GPB/GPC to realise H type sealing. This sealing machine could be used on food, daily chemicals or electronics industries.