Homebrew PCBs

I would buy LED light over tube if it works





________________________________
 From: tda7000 <Tda7000@...>
To: Homebrew_PCBs@yahoogroups.com 
Sent: Saturday, June 29, 2013 10:27 PM
Subject: [Homebrew_PCBs] Re: shelving vinyl toner transfer
 


  
Different resist will probably be slightly different but around that should work fine. I am using standard power LEDs with a wavelength of 395~400nm and they work fine with negative acting resist from eBay.

--- In Homebrew_PCBs@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
>
> http://www.ebay.com/itm/High-Power-5w-uv-led-chip-395nm-Factory-price-ROHS-/221247492077?pt=LH_DefaultDomain_0&hash=item338360cfed
> 
> 
> will 395nm uv do it? What is the specd wavelength for the resist?
> Â 
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> 
> ________________________________
>  From: Gustavo Villada <villada@...>
> To: Homebrew_PCBs@yahoogroups.com 
> Sent: Saturday, June 29, 2013 8:40 AM
> Subject: Re: [Homebrew_PCBs] Re: shelving vinyl toner transfer
> 
> 
> 
> Â  
> On Sat, Jun 29, 2013 at 12:45 AM, James <bitsyboffin@...> wrote:
> 
> > **
> >
> >
> > On 29/06/13 14:47, Terry wrote:
> > >
> > > So, to clarify, are you saying to spread the ink on the board, then
> > > cover with cellophane? Then while still wet, place the mask and expose?
> > > .
> > >
> > >
> > >
> >
> > Yes that's correct.
> >
> > Thin layer of the ink (paint, whatever you want to call it), cover it
> > (still wet) with your cellophane (or other suitable plastic which
> > works), put your artwork against the cellophane, expose for XX minutes,
> > remove artwork, peel off cellophane. The unexposed areas (black in your
> > artwork) will be wet and simply wipe clean, the exposed areas will be
> > cured hard like epoxy.
> >
> > The ink is cured (dried and hardened) by UV, drying it any other way is
> > virtually impossible, and just makes it really hard to remove the
> > unexposed areas afterwards.
> >
> > The cellophane (whatever) covering serves two purposes, one it keeps the
> > ink off your artwork, and two it seals the ink against air while you are
> > exposing it - air inhibits curing.
> >
> >
> I test today and work fine, but I'll need to buy a couple of UV tubes since
> this winter is raining a lot :(
> 
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