Thanks Kevin! This is exactly what I was looking for! Roger Sent from Outlook
On Mon, Mar 9, 2015 at 1:37 PM -0700, "Kevin Rice" <ke...@processreversal.org> wrote: Roger, They use gelatin which has been specifically manufactured to perform within certain mechanical and optical standards. However, the process of getting that layer to adhere to the base is, of course, the trick to proper subbing. Such processes vary depending on the composition of the material you are trying to sub. With cellulose (tri)acetate, the standard process is to use a mixture of gelatin, tanning agents and a base solvent (for example, acetone) that etch into the base and form a highly durable bound between the gelatin and the base. Any gelatin can be used, but as mentioned before, manufacturers will work closely with gelatin suppliers to achieve a quality of gelatin that gives optimal subbing properties. With PET (e.g. ESTAR et al), subbing is a more complicated affair because a suitable solvent isn't readily available. Accordingly, manufacturers developed a method of subbing that uses corona discharges to give the polyester base a temporary affinity for bonding with gelatin. After subjecting the base to this corona discharge, a mixture of gelatin and hardener is coated unto the base to act as a subbing layer (typically, this is done simultaneously with the actual emulsion layers in the cascade coating systems). I'm not familiar as to weather or not this method is still in use in production at EK, but some folks have been experimenting with it on a home-brew basis...check out this forum thread for more on this mad science: http://www.apug.org/forums/forum205/68928-corona-discharge-polyester-subbing.html Cheers, Kevin Rice processreversal.org pcn03031989.com (720) 270.3857 On Mon, Mar 9, 2015 at 10:12 AM, Roger D. Wilson <rogerdwil...@sympatico.ca> wrote: > Does anyone know what film manufacturers use as their subbing layer on > film stock so that the emulsion adheres to the base? > > Thanks > > Roger > > Sent from Outlook <http://taps.io/outlookmobile> > > > _______________________________________________ > FrameWorks mailing list > FrameWorks@jonasmekasfilms.com > https://mailman-mail5.webfaction.com/listinfo/frameworks > >
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