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  • XL 75 speed compensation water and ink

    Hi,

    Is there anyone who explain how speed compensation for water and ink works on a heidelberg XL 75?


    Regards,

    Frank

  • #2
    Some Copy/Paste work here.

    Speed-compensating characteristic curves.

    Use the Ink / dampness menu to select the speed values of ink fountain roller, water pan roller and coating pan roller in %.
    If the press prints at another speed, the quantity of ink, dampening solution or varnish is no longer adequate to achieve the desiredprinting quality.
    To transport the correct ink and/or varnish quantity into the press, the ink fountain roller speed must then change automatically.
    The press control system therefore contains characteristic curves that define the speed of ink fountain roller and/or water pan roller and coating pan roller as a function of the printing speed.
    The speed of the ductor motor continuously rises as the printing speed rises.
    The display in the Ink / dampness menu does not change.

    I hope it helps.
    Asif Qazi
    www.facebook.com/printindustry

    Comment


    • #3
      The simple way to check if the dampening compensating system is working properly is to, once an approved result is obtained, vary the press speed up and down. If set correctly, the speed of the press will have little, to no, effect on the work. Press manufacturers are not very reliable sources for compensation curves, it is best to work out your own.
      Some presses (like yours) benefit from a little extra water on the curve at start-up.
      Daniel T Roll
      904-305-2517

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      • #4
        Hello aqazi81 and fellow Lithographers,


        A freshly printed sheet laid before you ...... tells YOU all you need to know about the "Correct Ink/Water Balance" present on the press ......


        do not be "Bamboozled " by all the press console displays - they are only guide numbers !


        Regards, Alois


        Comment


        • #5
          "Right on" Alois

          Comment


          • #6
            Aqazi's post is correct.

            Press manufacturers normally build compensation arcs right into the press electronics but those aren't always accurate enough to cover the entire speed range, considering all the different envioronments and consumables.

            Some presses allow you to readily adjust the compensation arcs (ratios) at the console, and some don't.

            Comment


            • #7
              Originally posted by Alois Senefelder View Post
              Hello aqazi81 and fellow Lithographers,


              A freshly printed sheet laid before you ...... tells YOU all you need to know about the "Correct Ink/Water Balance" present on the press ......


              do not be "Bamboozled " by all the press console displays - they are only guide numbers !


              Regards, Alois

              Hi Alois, I also never used these but know what they are for. I've worked on late 80s or early 90s presses and there wasn't any concept like this on those old presses.

              Regards

              Asif
              Asif Qazi
              www.facebook.com/printindustry

              Comment


              • #8
                Hello aqaz81,

                Nice to know you still retain the "Old Skills" ........... hopefully you pass these on. Also tell the new printers ! not to rely

                on the press console displays -- we are selling the printed sheets not the numbers from the console.


                Regards, Alois

                Comment


                • #9
                  Originally posted by Alois Senefelder View Post
                  Hello aqaz81,

                  Nice to know you still retain the "Old Skills" ........... hopefully you pass these on. Also tell the new printers ! not to rely

                  on the press console displays -- we are selling the printed sheets not the numbers from the console.


                  Regards, Alois
                  Alois,

                  Most of our industry in Pakistan relies on operator skills rather than fancy devices, because the presses are too old by your standards.
                  Even now a late 80s press imported here from Europe or America is considered new.
                  Trend is now changing with some big players buying new presses.
                  Also the color management concept is gaining popularity but the sad thing is, people using it wrong and think that this color management thing is a holy grail. I see instructions printed on a sheet hanging on press consoles telling the most experienced operators how to put the ink in ink fountain, what should be the fountain roller speed and dampening roller should run at a certain point and bla bla bla.
                  Asif Qazi
                  www.facebook.com/printindustry

                  Comment


                  • #10
                    Originally posted by aqazi81 View Post
                    Most of our industry in Pakistan relies on operator skills rather than fancy devices, because the presses are too old by your standards. Even now a late 80s press imported here from Europe or America is considered new. Trend is now changing with some big players buying new presses. Also the color management concept is gaining popularity but the sad thing is, people using it wrong and think that this color management thing is a holy grail. I see instructions printed on a sheet hanging on press consoles telling the most experienced operators how to put the ink in ink fountain, what should be the fountain roller speed and dampening roller should run at a certain point and bla bla bla.
                    When used correctly, some of the newer automation and technology on modern offset presses is actually pretty awesome. Once gotten used to, someone can almost find themselves forgetting some of the common difficulties associated with operating older offset presses. That said, in my opinion even with all of today's advancements, printing is still printing and operator experience, skill, and understanding will still be advantageous in the workplace. Even (and sometimes, especially) when operating a machine that does much of the work itself.
                    Last edited by alibryan; 06-17-2017, 08:08 AM.

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