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acrilic backlight problem.

Discussion in 'Tips & Tricks' started by aerospacial, Jun 19, 2010.

  1. aerospacial

    aerospacial New Member

    14
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    1
    Sep 12, 2008
    Brazil
    hi all
    i just did and sign with 22 mts x 0,80 m. it is a backlight of aluminium, and the front face
    is in plates of 3mm cristal acrilic, with pieces of 2 mts x 0,80 m.
    in the day i finished it is all ok. but one week later it became wrinkled.
    i already did several signs like this and this is the first time something like this happened.
    it is not in direct sun.
    i am thinking in removing the 11 plates of 3mm acrilic and put 11 plates of 8mm acrilic.
    any help or ideas ?
    thnks
    Carlos

    see photos
     

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  2. Techman

    Techman Major Contributor

    8,520
    8
    38
    Jun 24, 2003
    michigan
    from what i see, there is no room for the acrylic to expand or contract with the heat.

    It will get wavy wrinkles if it cannot move.

    Did you give it some space between each panel?
     
  3. aerospacial

    aerospacial New Member

    14
    0
    1
    Sep 12, 2008
    Brazil
    never did that... leave space, how can i do that ?
     
  4. GVP

    GVP Active Member

    829
    19
    18
    Nov 11, 2005
    Swift Current, SK
    How are the panels attached to the sign?
     
  5. Techman

    Techman Major Contributor

    8,520
    8
    38
    Jun 24, 2003
    michigan
    you add in a "t" track in between each sheet. Leave about 3 mm of spacing between each sheet. The T track covers the spaces.
     
  6. aerospacial

    aerospacial New Member

    14
    0
    1
    Sep 12, 2008
    Brazil
    i cant use the T, because one of the
    One requirement was that the horizontal light was not interrupted in any way, even by 1 cm. that will be using an acrylic 8mm effect limiting or not?

    thnks
     
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