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Reversing film.

Reversing film.

2008-10-11 by David Hopkins

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

Re: [Homebrew_PCBs] Reversing film.

2008-10-11 by VK3YV

Hi David, I have been down the same road making negs from artwork. The only 
thing left that I know of and  I have been using for a while now is what 
appears to be the only thing being made is a German Lith film by the name of 
MACO GENIUSfilm which is Litho film coated on a clear and stable 100u 
polyester base.(Description on the packet of film) it is processed the same 
way as Kodak Kodalith Ortho used to be.
I get mine from a art supply house in Melbourne, Brunswick I think but I 
will see if I can find out where, its a while since I bought any.
For developing I use Koalith super RT developer A&B
CAT....445 6794.
For fixing I use ILFORD ILFOFIX II...CAT.1756948
Hope this helps.
73's Don VK3YV.....
Show quoted textHide quoted text
----- 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

Re: [Homebrew_PCBs] Reversing film.

2008-10-11 by leon Heller

----- Original Message -----
Show quoted textHide quoted text
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

Re: [Homebrew_PCBs] Reversing film.

2008-10-11 by ST de Feber

And what about Arista film ?

http://www.freestylephoto.biz/sc_main.php?cat_id=406

best regards

Simon 

--- David Hopkins <davhop@...> wrote:
Show quoted textHide quoted text
> 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
> 
> 
>

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