problem printing

Discussion in 'Heidelberg Printing Presses' started by xavi, Jul 27, 2017.

  1. xavi

    xavi Member

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    Hello

    For your experience , what is the problem ?
    in picture you can see problem trapp magenta and cyan

    thank you
     

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  2. NAGHSHE_BARTAR

    NAGHSHE_BARTAR Member

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    change 4 color unit In the following order
    unit 1 : black
    unit 2 : magenta
    unit 3 : cyan
    unit 4 : yellow
     
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  3. xavi

    xavi Member

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    Do you think this is the resolution?
    I'm working in certificated in ISO color 12647 for my secuence Colour is important
    Thank you very much
     
  4. mrheidelberg

    mrheidelberg Senior Member

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    try that sequence & see what happens....
     
  5. turbotom1052

    turbotom1052 Senior Member

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    the glaring problem that I see in the jpeg you posted is not, in my opinion, a trapping issue. You may very well have a bit of a trapping issue that just doesn't show up on the jpeg, but what I see that makes the job unsaleable is either an inking issue, or a water issue. Id be looking at the ink roller settings on the cyan unit first. Check roller settings to plate and then of equal importance check roller setting to the vibrators. Id pay the most attention the the number 4 inking roller to its vibrator setting. If the ink roller setting are good then Id check all setting on your alcohol system on the cyan unit.
     
  6. asem alsafady

    asem alsafady Senior Member

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    Hello every body
    Can you please send me a better photo, that I can see the lead edge and the tail edge, because I can't recognize are these lines appear vertically or horizontally.
    I hope we can solve this.
     
  7. xavi

    xavi Member

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    Dear Sir
    Can you sent email to me?
    xmoles@me.com and i will sent picture complete
    thank you
     
  8. Giangngo

    Giangngo Member

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    So which factors influence on this phenomenon? (people, machine, paper, ink, plate...) and how much do they influence?
     
  9. turbotom1052

    turbotom1052 Senior Member

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    The problem that most influences this issue, of the possibilities you listed are PEOPLE!!! It seems to me that an experienced press person should be able to diagnosis and remedy the issue your having. Its time to dig into your pocket and man you presses with someone other than the janitor.
     
  10. Giangngo

    Giangngo Member

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    I'm a student. I'm learning to become a printing engineer. Now I'm researching about trapping. Can I ask you more questions about this problem?
     
  11. turbotom1052

    turbotom1052 Senior Member

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    Sure ask away. I apologize for being snippy in my response. I admit that I do have an issue with companies management, that thinks that they can eliminate craftsperson jobs, and the compensation that comes with these jobs, in favor of inexperienced low wage laborers, and then come here for answers on how to print.
     
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  12. alibryan

    alibryan Senior Member

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    The internet is a world wide resource for everyone to use in whatever way that they can. Whether or not a person can find the answers that they need in a discussion forum (and having them be correct), however, may sometimes be another matter.
     
  13. Giangngo

    Giangngo Member

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    So I want to know about a factor of trapping - elastic paper. As I know, the factors influence the paper's elasticity are fiber properties (kind of paper, paper dimension), printing pressure, printing speed, humidity, temperature. But I don't know is that enough? and how much do they influence? and what do you usually do to reduce this phenomenon?
     
  14. turbotom1052

    turbotom1052 Senior Member

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    Thanks so much for you very informed lesson on the proper usage of the internet. Im not sure that I could have survived another day without your repeated, and visionary observances.
     
  15. junker1984

    junker1984 Senior Member

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  16. Tdj_81

    Tdj_81 Member

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    To reduce this Phenomenon what you are talking about is right what you said do all that . If you have trouble you usually look at all these things . Paper is a much like a human it can be all sorts of shapes and sizes you just have to give it some space and sometimes some more time. Sometimes more ink or alcohol depending and the mood the paper is in .

    These all have different influences and the outcome is never the same but sometimes it is . You’ll never know until you start with what you have at the time .
     
  17. alibryan

    alibryan Senior Member

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    Aww...you are so welcome!
     
  18. Giangngo

    Giangngo Member

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    It's a good advice. We'll never know until we start with what we have. But I'm a student. I don't have many chances to work with a printing machine. So what I can do now is I must learn the basic knowledge so well. I hope I can learn more knowledge from your share
     
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  19. turbotom1052

    turbotom1052 Senior Member

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    one thing you can do to reduce the variables are to maintain a consistent climate in your pressroom. Just as important as a consistent climate is to make sure your freshly delivered paper has a chance to acclimate itself to its new environment. This is one area that is sorely overlooked. In todays fast past, I need it yesterday biznez mentality, where printers order for the job, instead of stocking any inventory, it is very commonplace for paper to go directly from the delivery truck into the press. Management really does need to get with the thinking that the RULES of printing that used to matter, can not be discarded just because they are at times inconvenient.
     

  20. KAB

    KAB Member

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    I hope you have at least two different ink suppliers,and yes it looks like someone is not quite sure of what they're doing.
     

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