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Paul Verizzo
07-05-2008, 01:33 PM
OK, this question has been burning for decades. Maybe you can help the itching...

Just how the heck is film coated; so thin, so consistent, multiple layers even? And all in the dark for pan and color films!

I'd ask for pictures but then I guess the lights would be on........ :rolleyes:

Ian Grant
07-05-2008, 01:50 PM
You can go look at coating machines, Google Dixons (http://www.t-h-dixon.co.uk)

There's plenty of information (http://www.dixontechnologies.com/infofocus.html) out there. They made Ilfords coating plant.

Ian

Paul Verizzo
07-05-2008, 08:48 PM
You can go look at coating machines, Google Dixons (http://www.t-h-dixon.co.uk)

There's plenty of information (http://www.dixontechnologies.com/infofocus.html) out there. They made Ilfords coating plant.

Ian

Thanks, pictures of machines, but how?

Photo Engineer
07-05-2008, 09:56 PM
There is a complete thread with pictures here: http://www.apug.org/forums/forum205/45479-film-coating-machine-homemade-flickr.html

How is it done? There are 3 basic methods in use today and 3 more that have been mostly abandoned except by 3rd tier companies.

The three modern methods include extrusion of gelatin emulsion onto support as shown in that thread, and by slide or curtain coating. It is all described in US Patent 2, 761, 791 granted to T. A. Russell of Kodak.

PE