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  • Image area get stain

    Why image area get stain like this in web offset
    Why image area get stain like this in web offset

  • #2
    Originally posted by saravinfo10 View Post
    Why image area get stain like this in web offset
    Could you post a PDF/image of the file so that we can see what you were supposed to print?

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    • #3
      pdf

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      • #4
        post the electronic file not a picture of you press sheet I think its just offset.

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        • #5
          Yes it's offset sheet electronic file not available. In sheet why the image area get stain. If desensitizing agent not applied on
          will image and non image area get stain. But here image area only get stain Why?

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          • #6
            Saravinfo 10


            Answers - 1) Badly Developed Plate

            2) Plate NOT Gummed correctly



            Regards, Alois

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            • #7
              Looks like scumming to me . . . dampener issues, emulsification . . .??????
              "If you think you are too small to be effective
              you have never been in the dark with a mosquito."

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              • #8
                If gum not applied will image area will pick stain as in the pic.

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                • #9
                  What is my doubt is if gum not applied will image area get stain during printing

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                  • #10
                    Originally posted by saravinfo10 View Post
                    If gum not applied will image area will pick stain as in the pic.
                    Yes.

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                    • #11
                      We are applying gum to protect the non image area and to give hydrophilic property to the non image area then why image area which has photosensitive coating get stain. Image area must get ink only not stain.

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                      • #12
                        are you referring to the stain surrounding the black type? If so I would suggest a brisk circular motion cleaning of the plate AFTER youve removed the ink with a solvent. One you've thoroughly cleaned the black plate with a creme style plate cleaner suitable for your brand of plates I would apply a generous coating of AGE and then be sure to buff out the AGE completely leaving no traces of the AGE.

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                        • #13
                          My question is while making plates we are applying gum to the plate then send to the press room. If we did not apply gum in the plate making stain will gum in the press run. But you see in the pic black type and yellow screen are got stain those are image area. If gum not applied in plate making non image area only will get stain. But in this plate image area like black and yellow screean re got stain because not applying of gum in plate making. My question is we are applying gum to the plate to protect the non image area. why image also got stai

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                          • #14
                            saravinfo10,


                            Question: Are these "Stains" visible on the plate - BEFORE the plate image areas are inked - in, via the Press. ?


                            1) Whose Plates are you using? 2) Are you using a Plate Exposure Control Strip?




                            Regards, Alois



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                            • #15
                              No the stains are visible after inking

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