[ame=“http://www.youtube.com/watch?v=dlRKATLfSlQ”]YouTube - Oxidation Oven CALitzler Carbon Fiber Production[/ame]
At 1:10 they show the fiber entering and leaving the oven. How do they do that without letting air inside? I know it’s not as simple as a rubber seal like on your car door. :o
maybe the whole thing is in an argon or helium atmosphere
It just makes me wonder does the gas escape into the outside atmosphere? How does it insure that the outside atmosphere doesn’t leak in? Create a positive pressure with the inert gas? Seem like you would be wasting the inert gas. I’m clueless 
If the whole operation is in a chamber then that chamber would be purged of contaminants with the noble gas.another possible is being that there is heat involved cool air would not try to enter so maybe the noble gas is fed through and intake and allowed to escape past the proccesss avoiding contamination. another possible is a gas curtain like when you walk in to a store, the method to keep in the airconditioning. hopefully someone truly knows the answer and will chime in
“The End-Seal minimizes cold air infiltration and the bottom of the oven and hot air from escaping at the top of the oven. A patented venturi airbar is located above and below each fiber band. Each airbar is individually controlled using dampers. Our design uses hot air from the process to keep the tow at temperature and avoid tar build-up”
it’s in the youtube description
:embarrassed: That answers it.
Thanks 