Feeder Front Lays and Non-uniform Paper Size, SM52

Discussion in 'Heidelberg Printing Presses' started by Fawzi_Albasha1, Sep 7, 2021.

  1. Fawzi_Albasha1

    Fawzi_Albasha1 Member

    Joined:
    Nov 2020
    Messages:
    17
    Location:
    Amman, Jordan
    I have been trying to make sense of the following:

    There is a small problem with the guillotine I have causing the paper to have a size variation of + 0.5 mm from one side. So, one side of the paper stack is 100% straight, the opposite end is non-uniform.

    From what I understand, if the paper was loaded on the feeder with the extra (0.5 mm) left on the far edge (away from the reference edge/Front lays), the printed registration should not have any differences.

    Can someone please explain why the opposite is happening? The variation in size of the paper is effecting the registration accordingly.

    Thank you.
     
  2. NotAGooner

    NotAGooner Senior Member

    Joined:
    Dec 2007
    Messages:
    269
    Location:
    UK
    In an ideal world, paper should be back trimmed, but often times, paper is loaded from a stack straight from the mill and paper will vary in size, it shouldn't really matter if you have some variation, as one side will always be registered as long as it is no more than a few millimetres.
     
  3. CHOCK

    CHOCK Senior Member

    Joined:
    Dec 2016
    Messages:
    2,107
    Location:
    Managua,Nicaragua
    Hi sir:

    Am attaching in PDF, a complete understanding from Cutting in Practice for Polar, and you will a more ideas, and fix it.

     

    Attached Files:

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