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1. A seal part for an ink cartridge, 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.
2. The seal part for an ink cartridge of an inkjet printer as claimed in claim 1, wherein the seal end for sealing the ink outlet port of the ink cartridge 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, the other end surface is a plane with an aperture in center, and a size of the aperture is adequate to seal the ink supply needle of the printer.
3. The seal part for an ink cartridge of an inkjet printer as claimed in claim 1, wherein the seal end for sealing the ink outlet port of the ink cartridge has at least one circle of sealing flange on the cylindrical plane, one end surface of the seal end is an closed plane for preventing ink from flowing out from the ink outlet port after the ink cartridge is detached from the printer, the other end surface is a plane with an aperture in center, and a size of the aperture is adequate to seal the ink supply needle of the printer.
4. The seal part for an ink cartridge of an inkjet printer as claimed in claim 3, wherein the seal end for sealing the ink outlet port of the ink cartridge has two circles of sealing flanges.
5. The seal part for an ink cartridge of an inkjet printer as claimed in claim 2, 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.
6. The seal part for an ink cartridge of an inkjet printer as claimed in claim 3, 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.
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