Seal part for ink cartridge of inkjet printer

A seal part for an ink cartridge, the seal part comprising:

• a seal end for sealing an ink outlet port of the ink cartridge,
• wherein the seal part is column-shaped, a cylindrical cavity exists inside the seal part, and a diameter of the cavity is greater than a diameter of an ink supply needle of the printer,
• wherein the seal end is cylindrical,
• an end surface of the seal end is a closed plane for preventing ink from flowing out from the ink outlet port after the ink cartridge is detached from the printer,
• another end surface opposite to the seal end is a flat plane with an aperture in a center portion of said another end surface, and a size of the aperture is adequate to seal the ink supply needle of the printer,
• wherein a material of the closed plane or at least a portion of the closed plane that allows the ink supply needle to pass through is elastic and retractable, the seal end for sealing the ink outlet port of the ink cartridge has two circles of sealing flanges on the cylindrical plane, one circle of the sealing flanges is located adjacent to a lower part of the sealing part, and the other one circle of the sealing flanges is located adjacent to an upper part of the sealing part.