There is photoresist available on ebay. DuPont Riston costs $2.20 per
square foot for example (item number 170919606000). An average board size
for me is 6"x3" double sided which is $0.50 in photoresist.
On the topic of etching, has anyone used electroetching? Does it compare
with ferric chloride or muriatic acid?
Jeff
_____
From:
Homebrew_PCBs@yahoogroups.com [mailto:
Homebrew_PCBs@yahoogroups.com]
On Behalf Of smilingcat90254
Sent: Sunday, November 11, 2012 1:05 PM
To:
Homebrew_PCBs@yahoogroups.comSubject: [Homebrew_PCBs] Re: Need More Heat - GBC Laminator (pics included)
I've been using a thermal press with direct temperature read out on the
aluminum heat plate. I can set temperature and pressure on the thermal
press.
HP toner will melt around 110C. might be even lower around 105C or so. At
lower temperature, the toner may have a harder time fusing onto the copper.
Copper needs to be ultra clean. I use 0000 steel wool. followed by scrubbing
with TSP solution using scotch brite (green) pad, then rinse with water then
cleaned with isopropyl alcohol. Wear glove through out the process. Laminate
image immediately to reduce contaminating the copper surface and oxidation.
Someone thought oxidizing in the etcher for few second made the image adhere
better. Haven't tried so have no comment about oxidizing surface.
I really do need reliable repeatability down to 6/6 mil. I may go to
photoresist. Found a source at around $3.00/ft^2. Not cheap but claims to
get images down to 1/1 mil. Stuff is called puretch. Distributor is an
artist out of South Carolina. Think and Tinker has similar material not as
high performance at around ??$2.00?? per square feet but you need to spend
over $100.00 for the minimum quantity.
Result I'm getting out of photopaper of all different kinds, specially
formulated toner transfer paper is just not cutting it for me.
Anyway, temperature set it around 105C to about 130C. At 115C and above the
plastic coating on the photopaper will decompose and will turn into hard
white film.
--- In
Homebrew_PCBs@yahoogroups.com<mailto:Homebrew_PCBs%40yahoogroups.com> , "dubob4432" <dubob4432@...>
wrote:
>
> Hello,
>
> I need to get a bit more heat out of this GBC Creative Laminator. Very
close but probably another 10-20C would be what I need (ability to adjust
would be EXCELLENT). How do I go about accomplishing my goal. Has the Daewoo
KSD602 thermostat -
http://www.daewood.com.hk/en/productdetail.asp?id=122<
http://www.daewood.com.hk/en/productdetail.asp?id=122&sortid=210&pid=.>
&sortid=210&pid=.
>
> http://www.bnkz.com/GBC/Laminator001.jpg
>
> http://www.bnkz.com/GBC/Laminator002.jpg
>
> http://www.bnkz.com/GBC/Laminator003.jpg
>
> http://www.bnkz.com/GBC/Laminator004.jpg
>
> http://www.bnkz.com/GBC/Laminator005.jpg
>
> Any assistance would be greatly appreciated. I did not remove the power
board area but have no problems going into that area - I am so close, I just
feel the toner is not being 'baked' onto the copper clad quite enough to
stand up to the time in the muriatic acid / H2O2 w/ the bubbler and small,
important pieces are coming off. Doing .5mm pitch smd work.
>
> Thanks in advance,
> Bob
>
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