Homebrew PCBs

err, water vapour absorbed by paper 'gassing' when heated?

Maybe store next ones in a airtight bag with a bag of sillica crystals.



On 31/03/06, Ramakrishnan Muthukrishnan <vu3rdd@...> wrote:
> Hi,
>
> I am trying to make PCBs using the Toner Transfer Method with cloth
> Iron. About a month back, I took afew Laser Printouts of the layouts
> and on the same day I made use of one of the printouts and made a PCB
> and it was a great success.
>
> Now, yesterday, i.e. about a month after I took the printouts, I took
> them off the cover and cut out another of the layouts and tried to
> make a PCB and it was a disaster. The edges got registered into the
> copperclad but the center portion never registered and air got trapped
> in the middle. I scratched off all the toner, cleaned the board very
> well and then tried again with another printout I had from my month
> old printouts and it was again a disaster. After about six takes, all
> my printouts got exhausted.
>
> I cannot find any reason why it should fail. The surface was clean and
> the heat applied was okay. Could it be that the toner got stuck on the
> paper very well since it is one month since I took it? I have never
> read anywhere that the PCBs should be made *right after* taking
> printouts. Should it be the case? I am anyway going to try a fresh
> printout (I do not have a printer at my disposal, have to go and take
> it at a shop afew kilometers away) tomorrow.
>
> Thanks
> --
>       Ramakrishnan - VU3RDD
>       http://www.zerobeat.in
>
>
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> http://groups.yahoo.com/group/Homebrew_PCBs
>
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>
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Lez