Gig Posters

Posters: 156255 | Bands: 135962 | Designers: 11547                 
   
       RSS Feeds

Username:   Password: 
Register      

Social Networking Activity                 



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

Results 1 to 4 of 4
  1. #1

    Default halftone questios from a froggy

    Hi,

    i got troubles printing halftones on textile.

    i got a drawing (black) containg several tones of black : 30% , 55% and 65%

    my positive is of 70lpi.

    what mesh must i use? i have 110, 137 and 175 mesh screens.

    i also wondered if having these 3 differents tones of black it's possible to print them on the same screen.
    when i take a 175 screen and try to incline my positive to see if i get some "moire", i can see that 55% and 65% blakc is ok but the 30% gets "moire".

    any answers? i'm fed up trying to print theses fucking halftones...

  2. #2
    Premium Member
    Andymac's Avatar

    Join Date
    Aug 2003
    Location
    Van Isle BC Canada
    Posts
    11,758
    Comments
    278

    Default

    Did you make your own film, or at least the art? you may have to change a few things.

    For starters, reduce your halftone screen line count to 45 or so, you will have better luck exposing them and holding them on your screen. 70 is pretty fine for graphic printing, it gets harder on textile.

    Can you print all 3 shade values in one screen - yes - a photo has these and more all on one.

    Your problem with the moire pattern is probably from the 'screen angles', these should all be set the same if you are outputing on one film. sometimes if they are being converted from colour they may have preset different screen angles.

    Use the highest mesh count you can to acheive the ink lay you need - the coarser meshes for black shirts with white ink, the higher meshes on white shirts with colour or black ink.

    Use an eliptical halftone dot...better still use random or stochastic...




    way easier to print on textile and other screenprinting applications than gridded halftones, way less opportunity for moire, way easy to expose, control, etc.

    A rough rule of thumb to determine halftone/mesh count is 3.5 or higher...
    so a 45 line screen should have a minimum mesh of 157.5 or more. the higher the count, the easier to hold the detail.

    You need a good stencil material, a good positive, a tight screen, a sharp squeegee, halftone ink (not always, but it helps) and a consistant print set up if you are going to print nice halftones.

    Bon chance.
    Andymac

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

    Todo es empezar.

  3. #3

    Default

    thanx Andy, that's cool

    I also want to thank Scott Blake for answering my questions too.
    cool guy

  4. #4
    loco's Avatar

    Join Date
    Feb 2004
    Location
    Fresno, Ca
    Posts
    12,911
    Comments
    67

    Default

    I'm printing 40 & 30% black screen tints with 50 line screen today. I'm going to try 230 mesh if that doesn't look good to me or if I start smearing out the dots I'll go to 305 mesh. I'm going to use newman roller frame.
    The tension will be at 35 newtons (the amount of tension of of screen)
    I will be using Rutland process black ink.
    I'll try taking a picture and then PM you so maybe I can show you the results.

    Hope this helps -LOCO

Posting Permissions

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