On Sun, 10 Jul 2016 10:39:45 -0700, you wrote:
>Made another attempt with the TRF. massive pressure with my iron. But it
>still doesn't work - what is happening is the toner is bonding to the TRF
>and when you lift the TRF it takes the toner with it?!
Massive pressure sounds wrong. You want the toner to be tacky. The
pigment on the foil is very lightly attached. Run a sample of the
foil attached to a laser copy through a laser printer that's going to
print a blank page. You should get perfect adherence.
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>I'm trying to think of what might be going wrong here. problems with my
>toner? The fact that the boards are FR4?
I use FR4 boards, so no problem there. Your toner may or may not be
adhering to the board well, that's a thought. I really wish you had a
laminator to use, I think it would even out the questions about iron
temperature and pressure.
Generally, when making a board, too much heat and pressure will cause
the toner to spread out. Ideally, you want enough to make the toner
tacky, and perhaps locally melt it, but not liquefy it, so tacky and
tarry is good. Now in addition, you want just enough pressure to
eliminate air voids, I don't think you need much more.
Harvey
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>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
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>On Wed, 29 Jun 2016 21:47:38 -0700, you wrote:
>
>>Okay. So yeah.. it just doesn't work at all. Tried the laminator but the
>TRF wouldn't stick (probably the laminator's 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.
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>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
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>>Kind of disappointed. Oh well. :) They do have white toner printers out
>now. $3000+ each though. :)
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