I've used TWO sheets of drafting paper (translucent,
milky-white color) with the trace patterns aligned and facing down
toward the PCB. Drafting paper allows UV to pass right
on through to make "blue prints". I exposed the resist
with fluorescent UV "black lights" from Walmart. Two
sheets were used because the toner from
my HP Laserjet printer wasn't opaque enough to use just
one sheet.
Charlie
On Mon, 7 Jan 2013 14:35:48 -0800 (PST) Kevin Byrne <
kbyrne10@...>
writes:
I have LasarJet 4 600dpi. What can I do to improve in opaque except two
copies. Is there a better way? Best Kevin
________________________________
From: AlienRelics
alienrelics@...>
To:
Homebrew_PCBs@yahoogroups.com Sent: Monday, January 7, 2013 4:03 PM
Subject: [Homebrew_PCBs] Re: Looking for a hi quality laser printer for
photoresist pcbs..
Did you mean "not opaque enough"?
Black is not the best color to use when using an inkjet for this. The
lighter shades in a dye inkjet printer have additives to them that block
UV, to slow fading.
Several have experimented with this and have found shades of green that
mix just the right blend to block UV and work well.
It is easier and cheaper to get high resolution inkjet than to get high
resolution Laser.
Steve Greenfield AE7HD
--- In Homebrew_PCBs@yahoogroups.com, "r.d. terramir" wrote:
>
> inkjets don't do a very good job on transparencies and the printout
tend to
> be too opaque.
> there are methods around this like printing two copies and overlaying
them
> but there not perfect methods
> my $.02
> terramir
>
> On Mon, Jan 7, 2013 at 12:32 PM, Leon Heller wrote:
>
> > On 07/01/2013 19:46, Hikmet wrote:
> > > I'm looking for a laser printer for photoresist pcb's.
> > >
> > > I want to expose minimal trace and clearance.
> > >
> > > Could you share your experience ?
> > >
> > > I think it would be 1200X1200dpi , mono's prefered. And toner
quality is
> > > important too.
> >
> > Why not an inkjet printer?
> >
> > Leon
> > --
> > Leon Heller
> > G1HSM
> >
> >
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, and
Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
> >
>
>
> --
> Respectfully,
> R. Daniel Borkan
> 727 S. Coronado St. 201
> Los Angeles, CA 90057
> H: (213) 739-1863
> C: (213) 271-6721
>
>
> [Non-text portions of this message have been removed]
>
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