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1. An ink cartridge for an inkjet printer, the ink cartridge comprising:a sealed ink storage volume;an ink outlet for sealed fluid communication between the ink storage volume and a printhead;an air inlet;an air bag in the ink storage volume, the air bag in fluid communication with the air inlet for expanding as ink is drawn through the ink outlet to keep a constant pressure in the inkjet printhead; wherein,the ink outlet has an outlet valve that is biased closed and opens upon installation in the printer; and,the air inlet has a frangible seal that is ruptured upon installation in the printer.
2. An ink cartridge according to claim 1 wherein the air inlet is spaced from the outlet valve, and, the outlet valve and the air inlet are configured for engagement with complementary formations on the printer such that the ink outlet and the air inlet are both opened upon installation of the cartridge in the printer.
3. An ink cartridge according to claim 2 further comprising a rigid housing, the housing having a docking face for abutting a complementary face on the printer, wherein the outlet valve and the air inlet are both in the docking face.
4. An ink cartridge according to claim 3 wherein the outlet valve is at the lowest part of the cartridge when installed.
5. An ink cartridge according to claim 4 wherein the docking face is substantially flat.
6. An ink cartridge according to claim 5 further comprising a conduit in the ink storage volume, one end of the conduit being connected to the outlet valve and other end being open to ink within the ink storage volume and positioned such that it does not get obstructed by the air bag as it inflates.
7. An ink cartridge according to claim 6 wherein the ink storage volume is partially defined by a roof wall, the roof wall being substantially flat, parallel to, and directly opposite the docking face such that the cartridges are vertically stackable on each other.
8. An ink cartridge according to claim 1 wherein the air bag has flat top and bottom sheets separated by side walls folded in a concertina fashion when the air bag is deflated.
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