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  1. #1
    Join Date
    Feb 2011
    Location
    Arizona
    Posts
    14

    Question: Didde Start-up Procedures

    Howdy Folks,

    I'm a prepress guy at a printing company and they are running Didde 175's / 860's downstairs. The presses have conventional dampening systems on them.

    My question is what is the proper start-up procedure? Should the operators be dampening their plates before dropping the form rollers etc.?

    I used to run sheet fed presses years ago and always dampened the plate before dropping the form rollers to prevent ink build-up, screens being filled in and to save on paper and so on.

    Thanks, Bob

  2. #2
    Join Date
    Apr 2011
    Location
    Illinois
    Posts
    120

    Your 860s should have either quad flow or tri flow, the 175s had conventional. Anyway, the best way to start up a dry web is to have a very small sponge in the tray, start the press on a slow idle, while the doctor is spinning add fountain solution to it only with the fountain water on. Drop your water form, look for a shiny plate, then hit ink and impression. Shine is good, dull is bad.

  3. #3
    Join Date
    Feb 2011
    Location
    Arizona
    Posts
    14

    Quote Originally Posted by HPC View Post
    Your 860s should have either quad flow or tri flow, the 175s had conventional. Anyway, the best way to start up a dry web is to have a very small sponge in the tray, start the press on a slow idle, while the doctor is spinning add fountain solution to it only with the fountain water on. Drop your water form, look for a shiny plate, then hit ink and impression. Shine is good, dull is bad.
    Thanks for the reply. The way they are doing it now . . . looks like their just dropping the form rollers on the plate dry after start up and relying on the rollers/fountain to clean the plate. It makes more sense to me to dampen the plate first like you are stating.

  4. #4
    Join Date
    Apr 2011
    Location
    Illinois
    Posts
    120

    Quote Originally Posted by Sound Design View Post
    Thanks for the reply. The way they are doing it now . . . looks like their just dropping the form rollers on the plate dry after start up and relying on the rollers/fountain to clean the plate. It makes more sense to me to dampen the plate first like you are stating.
    On a press with conventional its much easier to get it balanced once the ductor is saturated. On a press with quad flow, tri flow or Dahlgren the ink/water is combined, but dampening happens immediately.

  5. #5
    Join Date
    Feb 2011
    Location
    Arizona
    Posts
    14

    Quote Originally Posted by HPC View Post
    On a press with conventional its much easier to get it balanced once the ductor is saturated. On a press with quad flow, tri flow or Dahlgren the ink/water is combined, but dampening happens immediately.
    So a quad flow, tri flow or Dahlgren doesn't require any manual dampening? Only with the conventional system.

  6. #6
    Join Date
    Apr 2011
    Location
    Illinois
    Posts
    120

    Correct.

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  8. #7
    Join Date
    Feb 2011
    Location
    Arizona
    Posts
    14

    Quote Originally Posted by HPC View Post
    Correct.
    Thanks again for the info. This will help a lot.

    Bob

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