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  1. #31

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    Spin Coating 30x40"

    Quote Originally Posted by Photo Engineer View Post
    I think it should be tried. I'm not aware of this method ever having been used due to the one off nature of the product.

    I think it is an interesting idea. Maybe I could whip up some emulsion and send you a jar.

    PE
    I've heard from John Preston that he used to spin coat very large sheets (perhaps vacuumed down acetate?). The sheets were about 30x40". They were coated with a silver halide gelatin photo emulsion and used for map making somehow. He says they got good even coatings, so I guess it can be done even on a very large scale.
    My guess is that this technique is best for very thin coatings, and figured it probably wouldn't work for very thick matrix film coatings.

    Regards - Jim Browning

  2. #32
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    Quote Originally Posted by dyetransfer View Post
    I've heard from John Preston that he used to spin coat very large sheets (perhaps vacuumed down acetate?). The sheets were about 30x40". They were coated with a silver halide gelatin photo emulsion and used for map making somehow. He says they got good even coatings, so I guess it can be done even on a very large scale.
    My guess is that this technique is best for very thin coatings, and figured it probably wouldn't work for very thick matrix film coatings.

    Regards - Jim Browning
    Again, it is no big deal to multicoat. And if there were reason to get fancy: some of these coaters have multiple injectors, are fully programmable, so you can push a button and go away. It'd be no big deal to have a plate wetted, spun, aired, baked, wetted, spun etc. ad nauseum. The nice thing about the process is that it is quite scalable, I'd see no problem getting up to full plate size at low speed (couple hundred rpm).

    But the proof is, of course, in the pudding. So let's just see!
    "Only dead fish follow the stream"

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  3. #33
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    Keith;

    Do you want some 4x5 sheets of film or 4x5 plates with the emulsion?

    PE

  4. #34
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    Plates. Or do you have other ideas...? I wasn't thinking of dealing with film at all. I mean, I could think about that if there is interest but glass plates would be much, much easier. Film would have to be adhered to a plate and then lifted... could be a pain.

    For film I think my idea of adapting an inkjet printer is probably more reasonable.
    "Only dead fish follow the stream"

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  5. #35
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    Ok, when I can get away to the PO or UPS I will send you 1 or 2 emulsions and a few plates (4x5).

    PE

  6. #36
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    Ooh I'm getting plates too? Goodie!
    "Only dead fish follow the stream"

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  7. #37

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    Kieth,
    I have promissed you a sample of a non-gelatin emulsion last week. Well I used it all up in testing. I have begun a new batch and will send you some befor I do anythingelse with it.
    That will be in a day or two.
    Bill

  8. #38
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    It's all good. Thanks.
    "Only dead fish follow the stream"

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