Homebrew PCBs

I'll throw this out there just in case.....

Is the copper really clean?  If water beads up on the copper *anywhere*
the copper isn't clean enough for laser toner-resist....water should just
"spread out" on the copper.  

When scrubbing the board with say, "Bar Keeper's Friend powder", before
applying
the toner, pay special attention to the corners.
 
Charlie
 
Made another attempt with the TRF\ufffd massive pressure with my iron.  But it
still doesn\ufffdt work \ufffd what is happening is the toner is bonding to the TRF
and when you lift the TRF it takes the toner with it?!  
I\ufffdm trying to think of what might be going wrong here\ufffd problems with my
toner?  The fact that the boards are FR4?
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Thursday, June 30, 2016 6:14 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Re: White TRF
  
On Wed, 29 Jun 2016 21:47:38 -0700, you wrote:

>Okay. So yeah.. it just doesn\ufffdt work at all. Tried the laminator but the
TRF wouldn\ufffdt stick (probably the laminator\ufffds fault.. not hot enough). So
then I did extremely hard pressing with the iron for 10 full minutes.
Dunked the thing in water.. but yeah. Nothing. If anything, the TRF is
lifting toner from the board.

The laminator I use is a simple GBC creative laminator. It's probably
an old model. What you might want is a laminator with a foil setting.

You can try with a simple laser print to experiment with, running the
laser printed paper through the laminator. Dull side to the toner. I
have had occasional sheets where (for whatever reason) the foil
refuses to adhere at all. You simply let the foil cool naturally and
then peel it off. Oil or water is not your friend here.

I'd use small pieces and hold them on with tape.

If the laminator will do a piece of paper, then it's getting hot
enough for that foil. If not, then something is odd. Next step would
be the board, and that will take a while to get hot.

Harvey

>
> 
>
>Kind of disappointed. Oh well. :) They do have white toner printers out
now. $3000+ each though. :)



Posted by: "Brad" <unclefalter@...> 


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