Homebrew_PCBs

----- Original Message -----
From: "David Hopkins" <davhop@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, October 11, 2008 1:32 PM
Subject: [Homebrew_PCBs] Reversing film.


> Gentlemen,
> For over thirty years I have been making PCB boards using a
> photographic method.
>
> The pre coated board I have been using is -ve acting.
>
> This requires a negative to be produced from the +ve computer
> generated artwork. For many years I used an orange (UV opaque)
> material made by 3M.
>
> This was taken off the market and I switched to an AGFA
> Printon Ortho daylight film. This was far superior than the orange
> film however the section of AGFA that made this film went out of
> business a couple of years ago.
>
> Try as I might I can't find a replacement for this film.
>
> What I need is a method that can make a high contrast UV opaque
> negative from a positive printed on cleat plastic.
>
> Anyone have any suggestons?
>
> Thanks
>
> David
>
>
> David G. Hopkins (Vk4ZF)
> CAPALABA QLD.
> AUSTRALIA
> S27 32.191 E153 11.867
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>


--------------------------------------------------------------------------------



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4:08 PM

----- Original Message -----
From: "David Hopkins" <davhop@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, October 11, 2008 3:32 AM
Subject: [Homebrew_PCBs] Reversing film.


> Gentlemen,
> For over thirty years I have been making PCB boards using a
> photographic method.
>
> The pre coated board I have been using is -ve acting.
>
> This requires a negative to be produced from the +ve computer
> generated artwork. For many years I used an orange (UV opaque)
> material made by 3M.
>
> This was taken off the market and I switched to an AGFA
> Printon Ortho daylight film. This was far superior than the orange
> film however the section of AGFA that made this film went out of
> business a couple of years ago.
>
> Try as I might I can't find a replacement for this film.
>
> What I need is a method that can make a high contrast UV opaque
> negative from a positive printed on cleat plastic.
>
> Anyone have any suggestons?

I used to get my positives made by a litho plate maker, from my 2:1
printout. I remember them making a negative first, as I got one back with my
positive.

Leon

> Gentlemen,
> For over thirty years I have been making PCB boards
> using a
> photographic method.
>
> The pre coated board I have been using is -ve
> acting.
>
> This requires a negative to be produced from the +ve
> computer
> generated artwork. For many years I used an orange
> (UV opaque)
> material made by 3M.
>
> This was taken off the market and I switched to an
> AGFA
> Printon Ortho daylight film. This was far superior
> than the orange
> film however the section of AGFA that made this film
> went out of
> business a couple of years ago.
>
> Try as I might I can't find a replacement for this
> film.
>
> What I need is a method that can make a high
> contrast UV opaque
> negative from a positive printed on cleat plastic.
>
> Anyone have any suggestons?
>
> Thanks
>
> David
>
>
> David G. Hopkins (Vk4ZF)
> CAPALABA QLD.
> AUSTRALIA
> S27 32.191 E153 11.867
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new
> Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo!
> Groups Links
>
>
> mailto:Homebrew_PCBs-fullfeatured@yahoogroups.com
>
>
>