Homebrew_PCBs

I've finally found a paper that works with the laser transfer method.
Only problem, it leaves a fine residue behind on an between the pads of
smaller smd i.e, ssop pic processors. Is anyone aware of a chemical
agent which will loosen this coating without lifting the laser transfer?
I'm trying dilute caustic soda which looks promising.

What is the paper? Do you know what the residue is?

Donald.
--
*Plain Text* email -- it's an accessibility issue
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----- Original Message -----
> From: "Kerry Koppert" <kkoppert@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, August 2, 2013 5:42:06 AM
> Subject: [Homebrew_PCBs] Glossy coating removal
>
> I've finally found a paper that works with the laser transfer method.
> Only problem, it leaves a fine residue behind on an between the pads of
> smaller smd i.e, ssop pic processors. Is anyone aware of a chemical
> agent which will loosen this coating without lifting the laser transfer?
> I'm trying dilute caustic soda which looks promising.
>

Hi
It's prob just the clay from the paper.
I just dump the board into the acid and it removes it
when ecthing.



73's Howard G7LQY
GQRP: 12549
Loc: IO83UO
LARGE FILES TO: hjpayneg7@...



________________________________
From: Donald H Locker <dhlocker@...>
To: Homebrew PCBs <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, 2 August 2013, 12:55
Subject: Re: [Homebrew_PCBs] Glossy coating removal




What is the paper? Do you know what the residue is?

Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: "Kerry Koppert" <kkoppert@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, August 2, 2013 5:42:06 AM
> Subject: [Homebrew_PCBs] Glossy coating removal
>
> I've finally found a paper that works with the laser transfer method.
> Only problem, it leaves a fine residue behind on an between the pads of
> smaller smd i.e, ssop pic processors. Is anyone aware of a chemical
> agent which will loosen this coating without lifting the laser transfer?
> I'm trying dilute caustic soda which looks promising.
>



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

On 2/08/2013 11:55 p.m., Donald H Locker wrote:

>
> What is the paper? Do you know what the residue is?
>

I don't know if the brand is available outside New Zealand, but it is
"fresh*paper" brand OCCASIONS Photo & Presentation paper. 180 gsm glossy
paper, glossy on one side ffairly rough on the other, made in China. I
haven't had access to a mass spectrometer for several years so I don't
know what the coating is, I just assumed it was Kaolin. There is a
website listed http://www.freshprintcompany.com but I can't connect to it.

>
> Donald.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ ascii ribbon campaign - <www.asciiribbon.org>
>
> ----- Original Message -----
> > From: "Kerry Koppert" <kkoppert@...
> <mailto:kkoppert%40xtra.co.nz>>
> > To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>>
> > Sent: Friday, August 2, 2013 5:42:06 AM
> > Subject: [Homebrew_PCBs] Glossy coating removal
> >
> > I've finally found a paper that works with the laser transfer method.
> > Only problem, it leaves a fine residue behind on an between the pads of
> > smaller smd i.e, ssop pic processors. Is anyone aware of a chemical
> > agent which will loosen this coating without lifting the laser transfer?
> > I'm trying dilute caustic soda which looks promising.
> >
>
>

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

Kaolin sounds likely. Toothbrush to get the fine stuff out and if caustic soda helps, use it.

Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: "Kerry Koppert" <kkoppert@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, August 2, 2013 6:40:17 PM
> Subject: Re: [Homebrew_PCBs] Glossy coating removal
> On 2/08/2013 11:55 p.m., Donald H Locker wrote:
> >
> > What is the paper? Do you know what the residue is?
> >
>
> I don't know if the brand is available outside New Zealand, but it is
> "fresh*paper" brand OCCASIONS Photo & Presentation paper. 180 gsm
> glossy
> paper, glossy on one side ffairly rough on the other, made in China. I
> haven't had access to a mass spectrometer for several years so I don't
> know what the coating is, I just assumed it was Kaolin. There is a
> website listed http://www.freshprintcompany.com but I can't connect to
> it.
>
> >
> > Donald.
> > --
> > *Plain Text* email -- it's an accessibility issue
> > () no proprietary attachments; no html mail
> > /\ ascii ribbon campaign - <www.asciiribbon.org>
> >
> > ----- Original Message -----
> > > From: "Kerry Koppert" <kkoppert@...
> > <mailto:kkoppert%40xtra.co.nz>>
> > > To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com
> > <mailto:Homebrew_PCBs%40yahoogroups.com>>
> > > Sent: Friday, August 2, 2013 5:42:06 AM
> > > Subject: [Homebrew_PCBs] Glossy coating removal
> > >
> > > I've finally found a paper that works with the laser transfer
> > > method.
> > > Only problem, it leaves a fine residue behind on an between the
> > > pads of
> > > smaller smd i.e, ssop pic processors. Is anyone aware of a
> > > chemical
> > > agent which will loosen this coating without lifting the laser
> > > transfer?
> > > I'm trying dilute caustic soda which looks promising.
> > >
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

Try adding a .au at the end of the URL.
They don't say much about their products, other than they source from multiple manufacturers. I wonder if the paper has a watermark on the back that may provide more clues?

Inkjet papers have multiple layers of coatings. Some to absorb the ink (and are therefore presumably water soluble), and some that stop the ink from reaching the paper (where it may spread out along fibres and ruin the definition). I'm wondering if you've inadvertently transferred one of these bleed stop layers onto the PCB. If it's made of a plastic then you could have trouble removing it without also removing the toner.

Good Luck,
Mark

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of Kerry Koppert
Sent: Saturday, 3 August 2013 08:40 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Glossy coating removal

On 2/08/2013 11:55 p.m., Donald H Locker wrote:
>
> What is the paper? Do you know what the residue is?
>

I don't know if the brand is available outside New Zealand, but it is
"fresh*paper" brand OCCASIONS Photo & Presentation paper. 180 gsm glossy
paper, glossy on one side ffairly rough on the other, made in China. I
haven't had access to a mass spectrometer for several years so I don't
know what the coating is, I just assumed it was Kaolin. There is a
website listed http://www.freshprintcompany.com but I can't connect to it.

>
> Donald.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ ascii ribbon campaign - <www.asciiribbon.org>
>
> ----- Original Message -----
> > From: "Kerry Koppert" <kkoppert@...
> <mailto:kkoppert%40xtra.co.nz>>
> > To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>>
> > Sent: Friday, August 2, 2013 5:42:06 AM
> > Subject: [Homebrew_PCBs] Glossy coating removal
> >
> > I've finally found a paper that works with the laser transfer method.
> > Only problem, it leaves a fine residue behind on an between the pads of
> > smaller smd i.e, ssop pic processors. Is anyone aware of a chemical
> > agent which will loosen this coating without lifting the laser transfer?
> > I'm trying dilute caustic soda which looks promising.
> >
>
>



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



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

Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links