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Subject: Re: [Homebrew_PCBs] finding ultra-thin copper sheet?

From: David McNab <rebirth@...>
Date: 2007-02-17

On Fri, 2007-02-16 at 12:05 +0100, otc_friend wrote:
> Hi David -
>
> >> I have here 0.125mm thick copper foil single-side coated with
> epoxy.
> >> The Epson Color 640 accepts it in "thick mode" switch.
>
> >Thanks for letting me know about that. I'm full of questions:
> >- are you a dealer?
> At the moment, maybe ;-)

If myself or anyone here gets success running the stuff through a laser,
you could well start getting orders :)

> >- what sizes does it come in?
> I can ask the supplier for bigger sizes. At the moment I have 20 x 15
> cm parts. One inch is 25.4 mm or 2.54 cm.

That's great for unmodified (reasonably straight paper path) inkjets,
especially since they're usually very good with arbitrary stock sizes.

Quite possibly could also mount on carrier sheet to run through a laser.

> >- is it flexible enough to tolerate the very curved printing path
> You must coat copper if you want to print on it with a laser.

What should I coat the copper with?

> >- what are the retail prices?
> If there is greater demand, I will look for supply.

Positive test results would surely generate some demand.

> >- is it available in small retail quantities, or only bulk?
> You can have a single sheet. Of course, I'm located in Germany. Don't
> know postage prices to you.

One or two sheets between the size of a credit card and a postcard would
be great. I'm in New Zealand. I could give you some $$ and send you my
address if you send me your paypal email address and a postage cost
estimate off-list.

> At the moment I just printed a sample. There is a need for greater
> test series...

It would be a huge boost to be able to circumvent the thermal toner
transfer process, for many reasons such as:
- eliminate artwork distortion
- eliminate transfer failure areas
- speed up the whole deal
- allow for vastly finer artwork

It would give the advantages of photographic transfer, but without the
extra cost of photoresist boards (or photoresist spray), developer, uv
lamp etc.

> Hope that helps a little.

Very, very interesting

Cheers
David