Character-printing vacuum sealer and sealing method using this character-printing vacuum sealer

A character-printing vacuum sealer, comprising:

• a base and a cover, the cover being movably hinged to a rear edge of the base, the base being configured with a vacuum pump, a control circuit board, and a power cord, wherein the vacuum pump is electrically connected to the control circuit board;
• an upper vacuum chamber and a lower vacuum chamber, wherein the upper vacuum chamber corresponds to the lower vacuum chamber and forms a heat-seal area when the cover is closed against the base, wherein the upper and lower vacuum chambers are each configured with a sealing gasket at their peripheries;
• a heating sheet assembly electrically connected to the control circuit board and positioned on a front edge of the base opposite to the rear edge;
• and a heat-seal strip being positioned on a front edge of the cover opposite to the rear edge, and configured to cooperate with the heating sheet assembly, wherein:
• a plurality of character belts and a character belt drive arrangement are respectively mounted inside or adjacent to the upper vacuum chamber in the cover and the lower vacuum chamber in the base;
• several protruding characters are arranged on a surface of each of the character belts;
• and an elastic character heat-printing mechanism is provided within the base or the cover corresponding to the character belt drive arrangement and configured for thermally printing the protruding characters of the character belts onto a pre-sealed vacuum packaging bag.