true, until the exit is no longer closed. At some point the pressure is using the ink up to the port so it can get out. If the bag is only 25% full, all of the ink will settle and expand the bag out at the bottom, possible to the point there is little ink near the port. As the pressure is reapplied and the exit opens some movement of ink upwards must occur.
I say this for the sake of discussion ... I agree that the changing of the bag shape is probably so minor and gradual as to not be a factor.
Yes, the bag will change shape extremely slowly as ink is being consumed (obviously) but not with the pressurization cycles at all. The port is always exposed to ink (until all the ink is exhausted), ink doesn't need to travel there as it's already there. Although as the cartridge empties, the ratio of ink flow to ink volume in the bag increases, and towards the very end of the cartridge that ratio will be high enough to effectively mix whatever is left of the ink.
I think we now agree that in the absence of ink flow, a pressurization cycle won't make the bag change shape whatsoever, correct?
Now, what happens when ink starts to flow out the bag in a pressurized cartridge? Does the bag then somehow change shape? Yes, proportionately to the ink flow to volume of ink in the bag ratio, i.e. extremely slowly. But this is unrelated to the pressurization feature. The same would happen in a unpressurized system,
or even a bag less refillable type cartridge Edit: no mixing from container shape change in a bagless cartridge obviously.
(I'm enjoying this exchange btw
)