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Thread: exposure time

  1. #1
    bastimag's Avatar

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    Default exposure time

    working on a screen thats bigger than my original "exposure set up"....i'm wanting to burn the screen in the sun....any ideas on time? (45 min, 1hr, 2hr?) i'm working on a short amount of time (to print the posters) so i'm hoping not to have to do the screen more than once. any suggestions, most helpful. thanks
    tschroeder
    bastimag@aol.com

  2. #2
    caribou's Avatar

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    Default

    most of what i've read on here is in the 1 minute range. check some of the posts in this section, i think andymac gave a good breakdonw of how to do it.

  3. #3

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    Are you really located in Edward Gorey's house?

  4. #4
    bastimag's Avatar

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    Default egh

    yes, i'm really in edward gorey's house. the bottom half is a museum to said illustrator, my wife is the curator and director and i'm the laze about stay at home dad that gets to use the attic and the barn for a studio....

  5. #5
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    Kathleen's Avatar

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    Default

    I live in indiana and I've used the sun at a couple of different times of the day.
    At 12 noon, it takes about 45 seconds
    at 3:30 it takes about 85 seconds

    I usually wait for a completely cloudless day.

    I have a big, completely opaque plastic yard sign that I slap over the screen after exposure and then I hustle it in to the shade and blast it with a garden hose with a pressure nozzle attatched.

    I use the standard speedball crap.

  6. #6
    bastimag's Avatar

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    Default thanks

    all was helpful. tommorow i will see if it was succesful. i think i like it this way. quicker, less of a space/set up issue.

  7. #7
    CCCP's Avatar

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    Do a test...

    Strips of rubylith or thick paper; take one off every 10 seconds.

    Use something detailed as your test image.

    Or, just wing it.

  8. #8

    Default Re: egh

    Quote Originally Posted by bastimag
    yes, i'm really in edward gorey's house. the bottom half is a museum to said illustrator, my wife is the curator and director and i'm the laze about stay at home dad that gets to use the attic and the barn for a studio....
    I seriously hate you. That sounds pretty damn sweet.

  9. #9
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    Andymac's Avatar

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    Default

    Those clear space bags they show on TV that you suck out with a vacuum cleaner and store your wedding dresses in make for a cheap vacuum frame for outdoor exposure.
    Or a sheet of glass on the posi and screen, with a foam pad underneath so it compresses. Sitting on a piece of plywood. A clever person could hinge this.

    You have to do a test to find the time. your mesh colour and emulsion brand and coating pattern will determine the time, along with the strength of the sun.
    Having said that, We are at 50 degrees latitude, on a sunny day in the summer with dualcure Autotype 8000 on yellow mesh, my time is 70-80 seconds. On white mesh, about 50 seconds.
    Andymac

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

    Todo es empezar.

  10. #10
    Premium Member
    steve w's Avatar

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    bastimag is my hero, today.
    "I guarantee, the image will not be fade off and you will be pleasure it too. " - a bootlegger
    We need to print a tshirt "Avoid sucker effect!"-Fabio
    "fudge isn't sharp"-phoondaddy

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