You mean like this?
Ken, you almost brought a tear to my eye. One of the best posts I've read in 17 years of internet discussions.
You mean like this?
CMACD, NZOOMED, there is a lot missed here. Suffice it to say that you do not know a lot about high speed multi layer coating. Not your fault, but you do not want defects spread out, and the rollers and cabinets are oversized to allow undercut rollers to hold the film stiff and prevent surface defects and so there is a 2" minimum undercut (40" + 2") to prevent touching.
Lots of engineering here that slips by. I could teach a year long course in this and still be way short as I am not the person to teach this sort of course. I was not a coating engineer.
PE
Undercut rollers are shaped like thisi: [-] with a depressed center and raised edges. The uncoated edges ride on the raised edges of the roller and the coated center does not contact anything. An air bearing is simply a plate with holes in it and air blowing out through the holes. This air pressure keeps the film from contacting the plate. If the plate and film are at the right angle to the initial direction of travel, then the direction can be changed in any way from 45 - 90 - 180 degrees.
In no case does the coated film surface touch anything.
PE
Ken, you almost brought a tear to my eye. One of the best posts I've read in 17 years of internet discussions.
http://www.kodak.com/global/en/professional/support/techPubs/e6/e6.pdf
"To provide films that meet the needs of different kinds ofphotographers, Kodak allows for this aging process duringmanufacture. Kodak builds a small manufacturing bias intofilms for general picture-taking to compensate for changesproduced by typical storage conditions and delays betweenpurchase and processing."
"Kodak professional films are close to optimum colorbalance when they are manufactured and packaged. The filmwill remain near this balance if its stored as recommendedin the instructions or on the film carton and processed beforethe expiration date on the carton."
My freezer and my refrigderator handle that part of the film aging, not my aging.
In my experience, Agfa color films did not keep well even when frozen.
PE
This is why I hate to get into these discussions.
PE
IMeanwhile.....I would like to see what Dave Bias from Ferrania has to say about this.
Oxidation, pH change, reaction between ingredients, interlayer exchange........... Geez the list goes on! It depends on the job done by the Photo Engineer that keeps things stable even in a freezer.
This is why I hate to get into these discussions.
PE
My freezer is set far below normal household levels. Agfacolor neg. went fast!
PE
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