Another approach I've successfully used for TT is
to heat the PCB in an oven to ~300 F and then
apply the TT material. Use an iron to further
raise the temp of the board to get full
transfer. The idea is to get the board almost to
the proper temp,, apply the TT material and then
finish raising the PCB to the proper temp. with the iron for a good transfer.
Not cleaning the board has been my biggest
problem. A lesser problem has been getting the
board too hot in the oven and the TT medium
shrinks causing a mess on the board.
At 09:46 AM 7/28/2006, Myc Holmes wrote:
>I agree, multiple passes are needed.
>
>I run the pcb through the Xerox laminator about 10 times, flipping it each
>time. When t is too hot to handle, then I know ti is ready. It is a lot
>easer to run it a few extra times to be sure.
>
>Afterwards, I "flash fuse" the toner with a hair dryer to reduce the
>granularity and seal the toner better.
>
>The laminators are designed to heat paper, with a very low mass. It takes a
>lot more energy to raise to temp of a pcb to the critical point.
>
>Myc
>
>On 7/28/06, Robert Hedan <robert.hedan@...> wrote:
> >
> > > -----Message d'origine-----
> > > De : Homebrew_PCBs@yahoogroups.com
> > > [mailto:Homebrew_PCBs@yahoogroups.com] De la part de sethkoster
> > > Envoyé : juillet 28 2006 08:57
> > > À : Homebrew_PCBs@yahoogroups.com
> > > Objet : [Homebrew_PCBs] Re: Still getting broken traces.
> > >
> > >
> > > I think it was a pressure problem. I tested my iron before and the
> > > hottest it gets is just under 350F, but the other day when I
> > > got my .032" boards and laminator I was able to do a better transfer.
> > >
> > > The laminator itself does not get hot enough, if I run the
> > > board through it the toner doesn't even adhere slightly to
> > > the board, but if I iron it to heat it then run it through
> > > the laminator and repeat the process a few times I can get a
> > > solid looking transfer.
> > >
> > > But after etching I still find areas where the porosity of
> > > the toner creates opens in traces.
> > >
> > > I think I need some sort of sealant for the toner.
> >
> >
> > I use a GBC H300 laminator and I pass the PCB about 15 times, flipping the
> > PCB over each time.
> >
> > Robert
> > :)
> >
> >
> >
> >
> > Be sure to visit the group home and check for new Links, Files, and
> > Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBs
> >
> > If Files or Photos are running short of space, post them here:
> > http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>[Non-text portions of this message have been removed]
>
>
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBs
>
>If Files or Photos are running short of space, post them here:
>http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
>Yahoo! Groups Links
>
>
>
>
[Non-text portions of this message have been removed]