Re: gEDA-user: diagnosing toner transfer problems

[DJ Delorie <dj@xxxxxxxxxxx>]

> Hear anything about such heaters putting out IR heat rather than contact heat, 
> and how that works with toner fusing?

>From what I've gathered so far, toner fusing works best when the
copper gets hot enough to partially melt the toner (250-300 F).  An IR
heater on the opposite side from the toner might work, if it can heat
up the board.

> I'm thinking pressure would stress them as is... they're too big.
> I'd have to make a cut down version sized to the board size you want
> to fuse onto to keep the pressure from cracking the glass.

Which pressure?  On the board?  The article I read said about 0.5 PSI
is ideal, you might need a standoff or two to support it.

> No trouble with the solid metal bun warmer plates.  But they would
> need something like a silicone blanket to transfer pressure
> evenly...

Here's the article:

http://groups.google.com/group/sci.electronics.basics/browse_frm/thread/c2aa69427d87a32e/487e75e49fd3e9c1?lnk=st&q=toner+transfer+pcb&rnum=3#487e75e49fd3e9c1

My thought was to use a standard electric frying pan (already OK'd
with the wife, no lead involved), then the board (copper up), then the
toner, then a couple more layers of paper to even the pressure, then
another pcb, then a block of wood (to insulate), then 5-7 lbs of
weights.


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