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PCB Film Reusable Stencil

Discussion in 'Electronic Design' started by Okidokee, Oct 3, 2004.

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  1. Okidokee

    Okidokee Guest

    Does any one know where I can get a film I used one time that is like the
    ones screen printers use, is coated blue and once exposed can be used as a
    stencil for etching over and over again a good many times?
    After being exposed it is put in a developer and developed for about 30
    seconds. The great thing about this stuff is that it can be used as a
    stencil repeatedly instead of having to expose a new board each time. You
    can just keep using the stencil.

    Thanks
     
  2. Robert Baer

    Robert Baer Guest

    It appears that this "film" that you refer to, has some kind of
    sticky surface, so that it adheres to the copper, thereby preventing
    liquid etchant from working in the undeveloped areas.
    It also would have to have an overall supporting matrix, and so act
    like a silk screen.
    About 20 years ago (or so) i remember seeing a non-sticky silk screen
    material that could be exposed (UV light, sun, fluroescents) and then
    developed; used in the arts for making greeting cards, posters, etc.
    Snoop around art supply stores, maybe you can find something like this.
     
  3. Rich Grise

    Rich Grise Guest

    At my client's factory they mark parts by electroetching them, and
    their stencils are blue - just a flimsy film with a heavy paper backing.
    You type on them, or use a dot matrix printer, and it makes the blue
    film porous. Try a search on Marking Methods Inc or The Lectroetch Co.

    Good Luck!
    Rich
     
  4. Robert Baer

    Robert Baer Guest

    That sounds very much like the "paper" wax stencils that were used for
    the rotary duplicators.
     
  5. Rich Grise

    Rich Grise Guest

    Yeah, it works pretty much the same, but it's not as much like waxed paper,
    but more like silkscreen silk, but flimsier, like 0.002" felt.

    Cheers!
    Rich
     
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