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Message

Re: Print on top of the pcb

2001-12-08 by thor918

Hi,
Don't you now any links to sites that explain this with pictures?
and do you know where to buy equipment to do this?

Thanks for the many replies :)
--- In Homebrew_PCBs@y..., JanRwl@A... wrote:
> In a message dated 06-Dec-01 10:10:12 Central Standard Time, 
> thor918@o... writes:
> 
> 
> > Does anybody know how to print on top of the pcb.
> > 
> 
> Thor:  This is done by "silk-screening".  A photographically-
made "screen" 
> (once made only of silk, but I think, nowadays, some tougher 
polyester is 
> used?) is used as a stencil, and PAINT is "squeegied" onto the 
board.  The 
> screen is liquid-tight in areas where you do NOT want the paint, 
and only the 
> "screen" (open weave of the "silk" cloth) is clear, allowing paint 
to squeeze 
> through.  This is an "art" which is used in more than just PCB 
work!  All 
> kinds of posters, signs, labels, etc., are made by the 
familiar "silk-screen" 
> method.
> 
> HOWEVER!  If you just MUST have some labelling on the "top" of a 
PCB, but 
> wanna make only ONE, and NOT spend all that for the frame, silk-
screen stock, 
> developer, squeegie-tool, paint, etc., you can use IMPRESSION 
lettering 
> and/or patterns.  Good art-supply stores will have more than just 
letters in 
> that stuff!  You want white or maybe yellow, but NOT black, etc., 
as those 
> colors hardly show on a FR-4 board.  Once you have "rubbed off" 
your entire 
> pattern, words, labels, etc., then SPRAY the top with clear enamel 
or 
> lacquer. AFTER you have etched!  And be careful not to get any of 
that on the 
> "copper side"!  It will look as nice as your steady hand can do 
that!  I have 
> done this countless times!  Also, for making "professional looking" 
panels!  
> Dial-numbers, ON/OFF, etc.  Just SPRAY it after all the rubbing-
off/on is 
> done!
> 
> Jan Rowland

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