Sounds interesting, how would a Teflon Spray work if it was applied to paper , I have seen some of these dry lubricants as such in a spray can cant remember the name, sorry.
Thomas
----- Original Message -----
From: gettingalongwouldbenice
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, November 30, 2004 8:06 AM
Subject: [Homebrew_PCBs] Teflon Toner Transfer
I finally got my hands on the sheet teflon.
I posted a photo in the electrostatic page teflon.jpg.
That's a TQFP64 SMT land pattern at 20 mil pin pitch.
As you can see, there are some horrible problems.
As expected the toner makes a very fine unfused image.
And virtually all the toner irons on to the board where it
makes contact.
Problem 1 is that the toner won't stay put.
It wants to jump all over the place. Slightest
jarring of the page makes everything fuzzy.
I'm hopeful that this problem
can be fixed by coating the page with something to make
it slightly conductive. Slipping a strip of aluminum foil
between the teflon and the paper carrier page did wonders
for the image from the drum, but just pulling it out of
the printer jarrs it enough for the toner to spread.
It's a pita to put the fuser back, but I should run some
experiments fusing the image.
Problem 2 is that the teflon is wrinkled. It's 0.002" sheet
taped to a paper carrier. There are slight deformatons in it from
manufacturing processes and being stored on a roll.
Heating it to 400F causes major deformations. Has localized
shrinkage that makes for a very uneven surface. It's a lot better at
300F, but I don't think there's
any chance of using the sheet more than once. I was hoping
teflon would be dimensionally stable under heat.
I don't have a laminator, but that might help if problem 1
gets solved.
So, I'm disappointed. Anybody got any really bright ideas?
Could use one about now.
Thanks, mike
[Non-text portions of this message have been removed]