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October 2003

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Subject:
From:
Dave Chapman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 3 Oct 2003 10:16:48 -0500
Content-Type:
text/plain
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text/plain (102 lines)
One note for cleaning the stencil, watch what you use, alcohol tends to trap
the adhesive and dry it out in the apertures. There are special wipes
available, better to have two tanks so you don't mix paste with adhesive
wash which should use heated water to soften more of the adhesive. Just our
opinion from what we have seen over past 4 years.
Dave Chapman

-----Original Message-----
From: Nowland, Russell Howard (Russell) [mailto:[log in to unmask]]
Sent: Friday, October 03, 2003 9:23 AM
To: [log in to unmask]
Subject: Re: [TN] Adhesive printing


Yannick,

This is a relative easy process and does not require any special equipment
except maybe cleaning equipment (stencil and board).  I always use stainless
steel stencils and squeegee blades.  There are plastic stencils available
but I always felt they were not robust enough.

The stencil I use is 6 mils.  On the PCA's that I used HASL on I
under-etched the discrete attachment pads 3 mils to provide a pocket for the
HASL to I got better gasketing and less bleed out.

I used Loctite 3612 because at the time it had the best strength, best
release, and stayed on the stencil better than the rest.

Aperture sizes I used were 0805 (18x60 mil) 1206 (28x70mils) 1210
(28x110mils) 0603 (12x40mils) SOT23 (12x120).



Russell Nowland
Lucent Technologies, Suite 100
7725 West Reno Ave.
Oklahoma City, OK 73127
Phone: 405-782-7765
Fax: 405-782-7905
email: [log in to unmask]


-----Original Message-----
From: Yannick Brisson [mailto:[log in to unmask]]
Sent: Friday, October 03, 2003 8:41 AM
To: [log in to unmask]
Subject: [TN] Adhesive printing


Hi,

        Does anybody ever try to print adhesive on a board, we have a double
side board which need to go after SMT in the wave, we must put some glue on
the board to keep the component on the board.  And it's time consuming to
get the glue off the board.  Now we are thinking to print adhesive with a
stencil.  What do I need to do that? what type of stencil, squeegees,
aperture for the component, how much adhesive must I have on the board,
thickness of the stencil, in other wordswhat do I need to know to do this
opertaion.

Thanks you

Yannick

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