Homebrew PCBs

There's an instructable on how to homebrew silk screen print for under $10 at:

http://www.instructables.com\/id/down_and_dirty_screenprinting_for_under_10/

Same here:

http://bit.ly/12S8Q

This has probably been raised before; but has anyone tried this for putting etch resist on PCB's?

Rgds, David

drmail377 wrote:
> This has probably been raised before; but has anyone tried this for putting etch resist on PCB's?

No, but it fits the first requirement -- "it looks like it might work".

I wouldn't use sign vinyl though -- in fact, I'd try and find some form of 
photoresist coating for screen-printing. A few years ago I was thumbing 
through a catalogue for a British company called "Specialist Crafts", who 
supplied all manner of arts-and-crafts products... including screen-printing 
equipment. One of the things they sold was a liquid that could be painted on 
to silk-screens, left to dry, then exposed to light (probably UV, or maybe 
bright sunlight), and then rinsed in water to remove the exposed mask. Once 
you'd finished, you cleaned the screen with a solvent to remove the rest of 
the mask.

Unfortunately I can't for the life of me remember what this stuff was called, 
and it doesn't seem to be on their website either (for that matter, about half 
of their product range seems to have vanished)...

Removing the 'track' vinyl whilst leaving the masks for small areas (e.g. dots 
inside pads) would probably be quite difficult. I suspect the cost/benefit 
ratio would be quite low for something like this... and that's assuming you 
could find a screen-printable ink or dye that's resistant to etchant.

Thinking along similar lines, aren't most PCBs "silkscreened" by applying a 
photo-resist like coating to the PCB, hitting it with UV light, then 
developing with $NASTY_CHEMICAL to remove the areas that were exposed to UV? 
Sort of like how solder resist is typically applied?

-- 
Phil.
ygroups@...
http://www.philpem.me.uk/

If you are crazy enough to cut out the traces one by one with a knife
then yes, it would work.

Steve (the list owner) has already tried a vinyl cutter/plotter for
PCB work, and reports that it works for the larger stuff but weeding
is a pain.

So even with a vinyl cutter this would seem unnecessarily tedious
compared to just plain toner transfer or photoprocess.


This gives me another idea though - would toner transfer work for
t-shirt transfers?
I imagine the toner would soon wash out, but with a color laser
printer it should be possible to make even color transfers very
efficiently without any special transfer paper?


ST

On Sun, Apr 12, 2009 at 6:14 PM, drmail377 <drmail377@...> wrote:
> There's an instructable on how to homebrew silk screen print for under $10 at:
>
> http://www.instructables.com\/id/down_and_dirty_screenprinting_for_under_10/
>
> Same here:
>
> http://bit.ly/12S8Q
>
> This has probably been raised before; but has anyone tried this for putting etch resist on PCB's?
>
> Rgds, David
>

Yes it has for many of years.
commercial company's used that process.
work for double side boards also.
Robert





Philip Pemberton wrote:

> drmail377 wrote:
>   
>> This has probably been raised before; but has anyone tried this for putting etch resist on PCB's?
>>     
>
> No, but it fits the first requirement -- "it looks like it might work".
>
> I wouldn't use sign vinyl though -- in fact, I'd try and find some form of 
> photoresist coating for screen-printing. A few years ago I was thumbing 
> through a catalogue for a British company called "Specialist Crafts", who 
> supplied all manner of arts-and-crafts products... including screen-printing 
> equipment. One of the things they sold was a liquid that could be painted on 
> to silk-screens, left to dry, then exposed to light (probably UV, or maybe 
> bright sunlight), and then rinsed in water to remove the exposed mask. Once 
> you'd finished, you cleaned the screen with a solvent to remove the rest of 
> the mask.
>
> Unfortunately I can't for the life of me remember what this stuff was called, 
> and it doesn't seem to be on their website either (for that matter, about half 
> of their product range seems to have vanished)...
>
> Removing the 'track' vinyl whilst leaving the masks for small areas (e.g. dots 
> inside pads) would probably be quite difficult. I suspect the cost/benefit 
> ratio would be quite low for something like this... and that's assuming you 
> could find a screen-printable ink or dye that's resistant to etchant.
>
> Thinking along similar lines, aren't most PCBs "silkscreened" by applying a 
> photo-resist like coating to the PCB, hitting it with UV light, then 
> developing with $NASTY_CHEMICAL to remove the areas that were exposed to UV? 
> Sort of like how solder resist is typically applied?
>
>   
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com 
> Version: 8.5.287 / Virus Database: 270.11.54/2055 - Release Date: 04/12/09 13:14:00
>
>

>> drmail377 wrote:
>> <Something about screen printing>

> Philip Pemberton wrote:
> <SNIP>
> Unfortunately I can't for the life of
> me remember what this stuff was called
> <SNIP>

Diazo Phot Emulsion

have you heard of the airbrush + UV technique, There is a UV curable product
that is applied by an airbrush, Also you can silkscreen on and Expose, using
the same exposure box used for the pcb.

On Mon, Apr 13, 2009 at 07:13, Andrew <andrewm1973@...> wrote:
>
>
>
> >> drmail377 wrote:
> >> <Something about screen printing>
>
> > Philip Pemberton wrote:
> > <SNIP>
>
> > Unfortunately I can't for the life of
> > me remember what this stuff was called
> > <SNIP>
>
> Diazo Phot Emulsion
>
>

I've used that glass paint that you bake in the over, once. I thought it was
a real PITA, and it didn't really come out that great. I should give that
stuff another chance, since I've heard such great things about it. I think
I'm a little less clumsy than I used to be, so it might come out a little
nicer than before.


[Non-text portions of this message have been removed]

i am refering to the following products.

Elpemer SD 2467 SM-DG (green solderstop)
Elpemer SD 2698 (white silkscreen) 

On Mon, Apr 13, 2009 at 13:13, Mike Oyama <mikesb0x0fm4il2@...> wrote:
>
>
> I've used that glass paint that you bake in the over, once. I thought it was
> a real PITA, and it didn't really come out that great. I should give that
> stuff another chance, since I've heard such great things about it. I think
> I'm a little less clumsy than I used to be, so it might come out a little
> nicer than before.
>
> [Non-text portions of this message have been removed]
>
> 



[Non-text portions of this message have been removed]

Hi guys,

I maybe a newbie here but there is a product made by CRC industries
sub-manufacturer Kontakt Chemie called Positiv 20 , it is a German
company I think .
Positiv 20 is a spraycan with a laquer that is sensitive to UV-light.
This product is specially made for PCB's .
Search the web for the data-sheet on the product and it can explain
it much better than I can.

Happy Easter,

Vereecke Serge. 

--- In Homebrew_PCBs@yahoogroups.com, Alexis Shaw <alexis.shaw@...> wrote:

>
> have you heard of the airbrush + UV technique, There is a UV curable product
> that is applied by an airbrush, Also you can silkscreen on and Expose, using
> the same exposure box used for the pcb.
> 
> On Mon, Apr 13, 2009 at 07:13, Andrew <andrewm1973@...> wrote:
> >
> >
> >
> > >> drmail377 wrote:
> > >> <Something about screen printing>
> >
> > > Philip Pemberton wrote:
> > > <SNIP>
> >
> > > Unfortunately I can't for the life of
> > > me remember what this stuff was called
> > > <SNIP>
> >
> > Diazo Phot Emulsion
> >
> >
>