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  1. #91
    David A. Goldfarb's Avatar
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    If it's a gelatin based emulsion, you've got to keep it warm and then flush it out of the system before it sets. I think an inkjet printer is going to be too slow to do it without clogging.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  2. #92
    AgX
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    Yes, I remember reading about that inkjet-coating here too, but wasn't it about coating paper?

    Anyway, reading in that Agfa coating head patent about the precision such a slit must have, and keeping in mind what PE is saying on coating precision, I doubt wether inkjet printing would gain sufficient eveness of the layer.

  3. #93

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    A coating machine can of course use a trough coater. This is far less complex and therefore easier to construct. Baker describes a lab scale machine with a trough coater.

    Trough coating is still used by some of the "boutique" film makers. It may be low tech but it works.

  4. #94
    AgX
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    In the literature Wofgang Schneider, the main person behind the early Agfacolor-type of films, a DIY-guy, is quoted to have built a coating machine in the late fourties in his private handicraft cellar which he could take under his arm…
    ...up to his R&D lab.

  5. #95
    Photo Engineer's Avatar
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    Jim Browning has built a trough coater and a plate coater. I have used both of his coating machines and they work perfectly. In fact, I coated about 40 ft of cyanotype on paper with his trough coater. I let the paper air dry.

    See the pictures and specifications on his web site.

    PE

  6. #96

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    trough coater

    Quote Originally Posted by Photo Engineer View Post
    Jim Browning has built a trough coater and a plate coater. I have used both of his coating machines and they work perfectly. In fact, I coated about 40 ft of cyanotype on paper with his trough coater. I let the paper air dry.

    See the pictures and specifications on his web site.

    PE

    See my site: www.dyetransfer.org . THere is a .pdf file there which has pictures of a simple trough coater assembled in a lucite box. It has 3 rollers which are made from aluminum,turned accurately, and plated with nickel. One is for supply, and has an adjustable slip clutch, and a hand crank. The film/paper is wound on the supply roller (with the clutch loosened), down under the coating roller, and up to an outfeed roller. The slip clutch is then tightened so that the film/paper will be held tightly to the coater roller to prevent emulsion from reaching the back as you pull the film out of the box.

    The film/paper makes a 90 degree turn around the outfeed roller and exits the box. You pour emulsion into the 'trough' under the coater roller via a funnel on the side of the box, and then start pulling by hand. It takes 2 people to run it, one to keep topping of the emulsion level, and one to pull the paper out of the box at a steady speed. It works suprisingly well. You can cut off long sheets and hang them up to dry, and keep on going until you either run out of emulsion, or substrate. Very simple, makes pretty good 20" wide coatings. You can get the proper Melinex 582 film from PF if you are coating film, or you can tape 20 x 24" baryta sheet together for coating paper, or better yet, get a roll 20" wide.

    Possible improvements would be a debubbling system and a pump controlled by a level switch, which would allow one person to operate it. Also, you could attach a leader, and attach it to a motorized windup system. This way, you could regulate the draw speed. You would wind up the leader, and stop before winding up the emulsion coating. You would then cut the coated sheet off, and hang it up on a track overhead for drying, and then reattach the leader for the next strip. My thinking was to operate the coater inside the dryer. The coater would be on a counter long enough to hold the strip. There would be clips on pullys which would be lowered from above, and you would just hoist the film up and out of the way, and slide it over to make room for the next sheet. You could make large amounts of film quickly with this system, without haveing to dry the film prior to windup, as the strips would dry in the space above the coating counter, and would be out of the way.

    Regards - Jim Browning

  7. #97

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    Certainly a magnificent piece of work but, though I'm not saying I could build one (without plans), I did always expect it wasn't beyond the capabilities of someone with the right background. After all, there are several large-scale versions working away out there. Emulsions would be the really interesting part in my opinion. Like okto, one of my biggest worries (photography-related worries, that is) is the idea of 35mm film being no longer available. However, I don't worry so much about the future of B/W since it is readily available from numerous manufacturers and relatively cheaply at that. So, anyone any ideas for a high-quality colour slide emulsion? Colour negative even? I'd also like EIR back!! My real worry is not so much that 35mm won't be available but that I'll be restricted to monochrome. Now, I also wonder if this machine could be adapted to coat reel-to-reel tape for those of us ill enough to take our analog obsession over to audio? ;-)

    P.S. (O.T.) This is my 3rd attempt to post this reply as, every time I come to this site, I seem to have to keep logging in every 2 minutes -- anything I'm doing wrong there?

  8. #98
    Photo Engineer's Avatar
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    With regard to EIR, if someone can get me 1 gram of the IR dye, I can make a respectable IR film. The problem is that you can't get the dye.

    As for coating machines, they can be built by anyone with the knowledge and the money. I have one but not the other. Your guess as to which.

    Color can be done. I will be aiming first at a dye bleach print material like Ilfocolor.

    PE

  9. #99

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    This is an exciting time to be into film.

  10. #100
    Stephen Frizza's Avatar
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    I am thrilled to know that in my neck of the woods such developments are occurring!



 

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