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Thread: Plastics question for film developing

  1. #21
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    16,001

    Re: Plastics question for film developing

    Willie, I thought the conversation was mainly in reference was to how to keep SHEET film from sticking. But reel holders did come up as an example of stainless versus plastic, so...

  2. #22

    Join Date
    Sep 2017
    Location
    Kent, UK
    Posts
    87

    Re: Plastics question for film developing

    Quote Originally Posted by Willie View Post
    PVC pipes tall enough for a full length roll of the film you use.

    One for pre-soak. One for developer. One for stop bath. One for fixer. One for rinse.

    Fill each and let get to room temperature. Open film cannister or 120 roll. Put on a clip you can life and move around - weight on the end of the film for going into the tubes.

    Develop in the dark, lift and shift to the next tank.

    Works well but takes time to get smooth with it.
    First I thought "this would use a lot of developer"

    Then I looked at some math - using a 2 1/2" pipe to fit comfortably a 120mm roll, with a length of 35" yields a volume of about 172in3, or 2.8 litre.

    So yes, it will use 6 times more liquid than a typical Paterson tank.

  3. #23
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    16,001

    Re: Plastics question for film developing

    Developer consumption is quite a factor in realistic choice of methodology. I use only 500 ml of fluid per roll of 120 in a Jobo hand inversion drum, and only 400 ml for up to 12 sheets of 4x5 in a tray. Typically a liter if 8x10 film is involved.

  4. #24

    Join Date
    Sep 2014
    Location
    Montreal, Canada
    Posts
    926

    Re: Plastics question for film developing

    I was able to solve the problem so it is now perfect. Film slides out like a charm.

    I’d still love to make this thing out of stainless but I doubt that will happen.

  5. #25

    Join Date
    Feb 2009
    Location
    Chicago, IL
    Posts
    151

    Re: Plastics question for film developing

    Quote Originally Posted by Michael R View Post
    I was able to solve the problem so it is now perfect. Film slides out like a charm.
    How did you solve your problem?

  6. #26

    Join Date
    Sep 2014
    Location
    Montreal, Canada
    Posts
    926

    Re: Plastics question for film developing

    Hi r_a_feldman,

    It ended up being a non-problem, but I tried replacing the smooth channels with textured. That did the trick, but the problem in the first place was simply that for the test runs, as opposed to how I normally process roll film, I was removing the sheets from the device before doing the final wetting agent step. Silly. If I do the wetting agent while the film is still in the device it slides right out perfectly every time with no resistance, whether the channels are smooth or not.

    I’d still prefer stainless steel though. I’d like to look into that.

    Quote Originally Posted by r_a_feldman View Post
    How did you solve your problem?

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