Screen Exposure Instructions w/ 500 Watt Halogen Light

Follow

Comments

65 comments

  • Avatar
    Wan Ahmad

    If I'm using a light box with a 500 watt halogen set to 1 feet from the center of the screen, how long should I expose it?

  • Avatar
    Lainey
    At that distance you should be one the 10-12 minute range.
  • Avatar
    doug poyourow

    I'm looking for an inexpensive exposure unit for exposing Solarplates. These plates are sensitive to UV (approx. 350). Do you know if the 500 watt halogen unit you sell would work?

  • Avatar
    Lainey

    Probably not. A smaller unit like this has difficulty maintaining small detail.

  • Avatar
    kathy hallock

    500 watt halogen stand 15 inches from the center of the screen using photopolymer emulsion, how long should I expose it?

  • Avatar
    Lainey

    Kathy-

    If you are using a Diazo emulsion it will be approx. 12 minutes. If you are using a presensitized emulsion you can try around 8 minutes. Smaller units such as this are not enough UV wavelength to properly expose the pre-sensitized emulsions effectively. Good luck and keep track of your tests.

  • Avatar
    Charmaine Ortiz Rountrey

    I made a homemade exposure unit,  but I'm having issues trying to burn the image--I'm using Ulano QTX on 230 Mesh--the glass in my table is annealed glass which supposedly doesn't have any uv coatings on it (I'm not sure if anyone can confirm this--if annealed glass will work or not).  The glass sits about 17 inches above 2    500 watt Halogens lights I have (I took the tempered glass off the Halogens and their cages)--I'm coating with a  scoop coater, placing a black fabric over the back of my screens during exposure time and weighting them down---even after 30 minutes it is not exposing the image--i'm coating the screens at night in my garage and covering them with black canvas during the day (my garage doesn't get very much light at all)--I do use a very dim night light to coat them at night--but it doesn't give off massive uv rays or anything--just enough for me to see.....  Any tips in getting them to expose?

  • Avatar
    Lainey

    The QTX is a very fast exposing emulsion.  Have successfully exposed emulsion on this unit before?

  • Avatar
    Charmaine Ortiz Rountrey

    I just made this unit, have just started trying to use  it...I have used the QTX before with great success using an expensive exposure unit ($2,000plus one bought by a school)

  • Avatar
    Ashley

    I'm thinking about buying this unit- I usually use Ulano LX-660 Emulsion, I had previously used your UV screen exposure unit and it worked well. Would I get the same results with this unit, just adjusting the exposure time?

  • Avatar
    Lainey

    @ Charmaine- the best way to determine the exposure time on your unit would be a step wedge test: http://support.silkscreeningsupplies.com/entries/20179338-finding-exposure-times Distance of bulbs and where you're located will actually play a role in the time.

    @ Ashley-  If you're used to using the open faced exposure unit, not only will the time increase, but the amount of detail you can acheive will decrease.  It is a reliable light for doing bulk prints and finer lines, but if you're in the market for halftones, you're better off going for a box unit.

  • Avatar
    Charmaine Ortiz Rountrey

    thought i'd add my solution to the problem with printing with 500  watt halogens. just in case someone else that lives in the south has the same problem.  

    it is extremely humid here in North Carolina year around.  the  problem with my screens not burning/ and washing out correctly is that the emulsion was not drying fully---the screens were a moist dry after 24 hrs.--not a warm dry--------the moisture from the humidity was keeping the screens from drying correctly 

     

    To fix

    - I had to buy a dehumidifier which ran for about a week to get most of the excess humidity out the air

    - once I coated my screen it had to dry a full 24 hrs.

    - after the screen dried a full 24 hrs. I had to use a space heater for about 20 minutes to make sure the surface was warm/dry

     

    the screens now burn, wash out, and print perfectly. 

  • Avatar
    Brevni Augustus

    Hello there, I'm using SaatiChem Textil HT (a Diazo polymer) on 43T screens I was wondering if you could recommend an exposure time at 16 inches? The only suggestions I've heard are 'trial and error' and was hoping you could steer me in the right direction, thanks.

  • Avatar
    Lainey

    Hello,

    These are the ball park times we have, with the glass removed from the 500 watt light:

    MESH 24-38 60-86 110-160 200-230 280-305
    Time 13m-14m 11m-12m 10:30-11:30 10m-11m 9m-10m

    43T is about 110 mesh count on that chart.

  • Avatar
    Brevni Augustus

    That's great and thanks for the quick response, I'll try it right away!

  • Avatar
    Traveil R. Goodrum

    I built a box  with the 500 watt halogen light at the bottom. glass at the top to lay the screen on with a black fabric board to lay on top of the of the screen...how long to expose

  • Avatar
    Lainey

    Hi Traviel,

    the best way to determine the exposure time on your unit would be a step wedge test: http://support.silkscreeningsupplies.com/entries/20179338-finding-exposure-times Distance of bulbs and where you're located will actually play a role in the time.

  • Avatar
    Traveil R. Goodrum

    also when washing the image out does it has to be under the yellow light or can I do it out side.

     

     

  • Avatar
    Lainey

    Hi Traveil,

    Best case scenario is to print under yellow bug light.  If you have to print under standard light, it is best to wet both sides of the screens in a light safe area and then take to wash out.

  • Avatar
    Traveil R. Goodrum

    okay thank that what I though I can just keep a cold water bottle with me wet it and on both sides then take it out side perfect

  • Avatar
    Lainey

    That should work just fine, Traviel- let us know if you have nay further questions!

  • Avatar
    Traveil R. Goodrum

    also I used my single color press on the counter and it flipping over on me, and I cant bolt it down. Im going to build a table what size should it be?

  • Avatar
    Lainey

    Hi Traveil,

    We recommend something about this size: 28"W x 38"D x 32.5" H

  • Avatar
    Michelle Belgrod

    Hi I just washed out my screen and the image came out, but the dried emulsion looks like it's going to peal.

    Is this because I forgot to take off the rubber end to my emulsion coater? 

    Is my screen ruined?

  • Avatar
    Lainey

    Hello Michelle,

    Peeling emulsion is due to improper exposure.  It sounds like you need to increase your exposure time.  Here are some under-exposure variables: http://support.silkscreeningsupplies.com/entries/20633847-Under-Exposure-Variables  Let us know if you have further questions!

  • Avatar
    Heather Mackenzie

    I am using the Ryonet 500w halogen beginner exposure unit and will be using Chromaline UDC-HV dual cure emulsion for the first time.  Will my exposure time be different than the recommended 12.5-13.5 minutes with this emuslion? thanks

  • Avatar
    Thebiz34

    With your new light stand that attaches directly to the press the light sits 24 in from the center of the screen...I tried exposing for 13 min and had a ton of problems with the image washing out.... the image would wash out fine but then the surrounding emulsion was washing out also.  I figured it was under exposed... How much time should it be under there.  I do live in FL so it is humid but I do have a dehumidifier running in there and the room is usually 80 degrees with about 30-35% humidity.  Is this a problem also.  Thanks

  • Avatar
    Lainey

    @ Heather- we apologize for the delay.  We had been experiencing some issues with our notification system from our forums.  With any emulsion that we do not sell, you will need to test to ensure you're getting the proper exposure times- here's how: http://support.silkscreeningsupplies.com/entries/20179338-finding-exposure-times

    @Thebiz34- How long are you allowing the emulsion to dry on the screen for, prior to exposing? 

     

  • Avatar
    Thebiz34

    I order the pre emulsion screens from you guys.  I usually expose within a week or so.

  • Avatar
    Lainey

    Hello Thebiz34,

    How long had you waited to expose these screens?  Also, how long have you had the bulb in your light?

Please sign in to leave a comment.