Patent ID: 7565978

Claim:
A vacuum packaging bag comprising: a plastic film bag equipped with a deflating device, the bag having three sealed edges and one open edge with a concave-convex fastener, wherein the deflating device comprises a base, a holding washer, a cover, and a sealing washer; the cover and the base are connected through screw threads; a main part of the base is located inside the bag while a screw part of the base penetrates through one side of the bag; a holding washer holds onto the screw thread of the base and fastens the plastic film of the bag against the base; the sealing washer is placed on a support; the support is placed on an air passageway between the base and an outside of the bag; and in a middle of the cover there is a pressure post which presses on the sealing washer; a deflating cylinder which works with the deflating device; wherein the deflating cylinder comprises a cylinder in which there is a piston; a front part of the piston rod has two holding boards between which there is a spacer; one of the holding boards has a notch; a back part of the piston rod is connected to a pulling handle: on the front part of the cylinder is a convex surface; a pulling ring is attached to the convex surface; and an outer surface of the front part of the cylinder has screw threads.