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  1. #1

    Join Date
    Mar 2007
    Location
    Dragsville, Alberta, Canada
    Posts
    6
    Comments
    0

    Default 500 watt work light and oiled paper positive exposure questions

    I'm using a homemade exposure unit with a 500watt work light. Can anyone give me a ball park figure on how far the light source should be away from the glass/positive?

    I am waiting for some transparencies to arrive, and have been experimenting with oiled paper and vellum positives. How long should it take to expose a screen with ellum? Oiled paper? With vellum, I found that the image washed out nicely, but the 11 X 17 area around it started washing out too...I think this is probably cause the vellum I used was too opaque...worked better with longer exposure time, but I startedto lose small details in a half tone. The oiled paper worked quite well on the first go...just wondering what ditsance light to positive and exposure times you guys are having succedss with...

  2. #2
    Premium Member
    Andymac's Avatar

    Join Date
    Aug 2003
    Location
    Van Isle BC Canada
    Posts
    11,668
    Comments
    277

    Default

    1.5 times the diagonal of your art, more or less.

    if stencil comes off during washout, or is thin it is underexposed, but you are also correct if the vellum blocks too much light, it will always screw up/close in the detail - that's the sign of overexposure, coupled with a solid stencil.

    somewhere in the middle. clear film works best, but you would be surprised what will burn a screen.
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

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