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Not having yet refilled my cartridges, I accept what you say about the foaming of the ink in the chamber as the pressure is reduced in the presence of residual air. I received my bulk ink and blank cartridges three days ago and am now gathering the syringes and other supplies. I have had similar experiences with foaming over the years, so what you say makes sense. However, you are a bit too loose in your terminology. Boiling and blowing bubbles are two different physical concepts. Boiling is not the same as deairing. When water boils, it is water vapor as a result of a change of phase of the water, not air, that is released to the system. Boiling occurs when the vapor pressure approaches the absolute pressure of the chamber. Or, to put it another way, the pressure of the chamber is reduced and approaches the vapor pressure of the ink. Evaporation can also occur, but this needs a longer time interval to be significant. Bubbles are indeed related to surface tension. A kid blowing bubbles is not experiencing boiling of the soap solution. The bubble itself is a product of its surface tension and it needn't adhere to anything such as a sponge to exist. What you physically have in the cartridge are three phases: liquid ink, air, and ink vapor (dependent on vapor pressure of the ink, the chamber pressure, and the temperature). The ink vapor is gaseous and is probably colorless. Since you are performing these tests, at what level (% of cartridge void volume) of evacuation does this foaming occur? Gary TMorris862@aol.com wrote: > And if ink boils ( deairs) in the cartrigde guess what the sponge will trap > these fine bubbles!! Do the words surrface tension mean anything? Once the > bubble attach to a surface > ( sponge) they tend to stay there! > > I got some refills with nothing but fine foam in the outlet ink flow and it > took a lot of flushing to get the foam out! It really happened guys!! No > guessing on my part! - Please do not include an entire message in your response. Delete the excess. http://www.leben.com/lists for list instructions.
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