Gig Posters

Posters: 155198 | Bands: 135206 | Designers: 11481                 
   
       RSS Feeds

Username:   Password: 
Register      

Social Networking Activity                 



 Bands  Designers  New Arrivals  Top Lists  Forums  Buy Posters  Submit  Merch Store  Advertise  Widgets  Help

Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    benc's Avatar

    Join Date
    Sep 2006
    Location
    columbia, mo
    Posts
    8
    Comments
    539

    Default positive/burning problem

    hey guys, i need help figuring this out. i recently built a different exposure unit and using the vegetable oil paper positives, the image keeps washing out. regular transparencies burn fine on both units, and my vegetable oil positives burn fine on the old exposure unit...just not the new one. when i add time the image and the exposed emulsion still both wash out, it just takes longer. i'm using light pressure when washing out, etc.

    the only thing i can think is the old unit had 1/4" glass and the new one has 3/8" and for some reason the light isn't getting through the paper as well. i've tried using a matte clear coat spray on the positive before i veggie oil it, and that seems to help a little...but i still get unwanted wash-outs for some reason.

    thoughts? thanks.

  2. #2
    Premium Member
    four0onestudio's Avatar


    Join Date
    Oct 2007
    Location
    Rochester, NY
    Posts
    220
    Comments
    8

    Default

    how long are you exposing? and what kind of light source?

  3. #3
    squeegeethree's Avatar

    Join Date
    Dec 2006
    Location
    Brooklyn, NYC
    Posts
    6,613
    Comments
    62

    Default

    Increase your exposure time or move the light closer. I hate to say it but this is one of the problems with makedo transp/and exposure units. However, play around with it, you'll find the sweet spot. Thicker glass will filter out more of the UV.

  4. #4
    Premium Member
    boatdreams's Avatar


    Join Date
    Jun 2008
    Location
    Chicag? Oh.
    Posts
    2,409
    Comments
    728

    Default

    Some glass blocks UV rays, which are what reacts with the emulsion. If UV is not penetrating the glass, that may be your problem. I'm not totally sure, but I think tempered glass is UV resistant.

  5. #5
    squeegeethree's Avatar

    Join Date
    Dec 2006
    Location
    Brooklyn, NYC
    Posts
    6,613
    Comments
    62

    Default

    Quote Originally Posted by boatdreams View Post
    Some glass blocks UV rays, which are what reacts with the emulsion. If UV is not penetrating the glass, that may be your problem. I'm not totally sure, but I think tempered glass is UV resistant.
    All glass blocks UV rays, but to various degrees. The best is low iron or some such thing.

    Besides moving the light closer or increasing exposure, you could coat your screen fewer times or maybe just better than you are. Vegetable oil people often don't use a scoop. Are you?

  6. #6
    Premium Member
    crosshair's Avatar


    Join Date
    Mar 2005
    Location
    Chicago
    Posts
    6,762
    Comments
    3866
    Items for Sale

    Default

    Quote Originally Posted by boatdreams View Post
    I'm not totally sure, but I think tempered glass is UV resistant.
    No.

    Somehow the myth that tempered glass will block UV and doesn't work for exposure, runs wild at GP. Not true.
    Architectural/UV glass resists UV significantly.
    Tempered glass is glass that has been hardened by a tempering process. It's greater strength and ability to withstand pressure and weight, make it ideal for exposure units. No significant UV blockage.
    And much less chance of breaking your glass.
    Crosshair pushing here until its limit the bringing together.

    www.crosshairchicago.com

    "Every single Crosshair poster I've ever seen is almost exactly the same. Do these guys even have a bit of creativity in them? I mean, come one - shitty old building pics photoshopped with text over them. Pretty pathetic to say the least."

    "it just seems like so little effort is put into creating this? am i missing something?"

  7. #7
    Premium Member
    boatdreams's Avatar


    Join Date
    Jun 2008
    Location
    Chicag? Oh.
    Posts
    2,409
    Comments
    728

    Default

    Ah, noted!
    I actually read that about tempered glass here on GP. Haha.
    justinsantora.com
    a letter of resignation

    "put the immersion on your mensch with a scrub-coaster. then print with a 70 durometer skyguy"
    -Steve W

  8. #8
    Premium Member
    Andymac's Avatar

    Join Date
    Aug 2003
    Location
    Van Isle BC Canada
    Posts
    11,699
    Comments
    277

    Default

    I had a screen come apart in the middle of a run today.

    I hate it when that happens. Now I'm spooked it will do it on the replacement. should I lose my temper, or drink beer, or what?
    Andymac

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

    Todo es empezar.

  9. #9
    squeegeethree's Avatar

    Join Date
    Dec 2006
    Location
    Brooklyn, NYC
    Posts
    6,613
    Comments
    62

    Default

    Quote Originally Posted by Andymac View Post
    I had a screen come apart in the middle of a run today.

    I hate it when that happens. Now I'm spooked it will do it on the replacement. should I lose my temper, or drink beer, or what?
    Smashy smashy.
    Did it rip along your tape?

  10. #10
    andydiesel's Avatar

    Join Date
    Mar 2003
    Location
    Portland, Oregon
    Posts
    34,774
    Comments
    1376

    Default

    Quote Originally Posted by Andymac View Post
    I had a screen come apart in the middle of a run today.

    I hate it when that happens. Now I'm spooked it will do it on the replacement. should I lose my temper, or drink beer, or what?
    as long as you ate the ripped mesh to appease the screen gods you will be fine on your next screen.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •