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Screen Ripple - is this normal?

Discussion in 'Projectors, Screens & Video Processors' started by muddyfun, Sep 2, 2001.

  1. muddyfun

    muddyfun
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    Hi Folks,<br />I have a pull-down screen 8 foot by 6 foot.<br />(Da-Lite, Model B, Class-rite).<br />It cost £270 + VAT.<br />I'm getting a noticable ripple either side towards the bottom - it looks like the two corners need pulling down to flatten the screen.<br />This obiously causes distortion when objects move across this image.

    Is this to be expected for a screen of this size & cost or should I take it back?

    Thanks in advance,<br />Muddy.
     
  2. jason t

    jason t
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    yeah i too have a model b and it has the same problem (mine is a video spectra gain 1.3)

    jason
     
  3. Paul O Hale

    Paul O Hale
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    The small roller diameter is one problem, also it is probably bending slightly in the middle under its own weight causing the 'V'creases you are seeing.
     
  4. squid

    squid
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    i allso have one of these screens . if you can put a waight on both bottom edges it helps a lot

    a couple of large fishing sinkers work well with a loop of sting . just put them on the ends of the bottom pole when the screen is down , it works wonders <img src="smile.gif" border="0">
     
  5. AlfaKhan

    AlfaKhan
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    Hi Muddy,

    I'm getting a little bit worried about this...

    I have a Model B ordered and really have no other option. (I need the small dimension case it comes with).

    There are a lot of other reports like yours.

    Which surface finish do you have?

    Txs.

    H.Borges
     
  6. muddyfun

    muddyfun
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    Thank you all for your advice.

    AlfaKhan, I have a Matte finish (well, my screen does).

    I have spoken to the people who supplied my kit.

    They said that this is unfortunately normal, but that steaming the screen can temporarily restore it. (I'll speak to them later for details, it sounds potentially dodgy to me, try this at your own risk!)

    Screens are available that hold the screen material in tension but cost well over a grand! Apparently, 1mm thick vinyl works, but the company that made these went bust.

    It looks to me that the ripples are only in the lower corners, suggesting that the screen material has stretched, or that the bar at the bottom isn't right, rather that the roller bending.
     
  7. Paul O Hale

    Paul O Hale
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    Muddy<br />the 'V' is inverted and would show in both bottom corners.<br />to prove if it is the cause is very simple, get someone to push the roller up in the middle while you watch what happens to the creases.<br />If it isn't V creasing then you are looking at a 'drop' crease which is a manufacturer fault.
     

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