In a message dated 05/10/2000 2:51:56 PM Central Daylight Time,
[log in to unmask] writes:

<< To all,

 We are trying to cost reduce part of our through hole assembly.  We build
 high voltage power supplies and they don't lend themselves to SMT.  The
 boards have the standard LPI solder mask, but we need to mask some component
 holes for components that are installed after wave solder.  Currently we
 apply Chemask® Peelable solder mask by hand from an 8 fluid ounce bottle.  I
 know there are ways of applying a solder mask using a silkscreen.

 What equipment is needed?

 What mask material should I use?

 What support equipment do I need?

 Did I leave anything out?

 Thanks in advance for your input.

 Phil Nutting
 Manufacturing Engineer
 Kaiser Systems, Inc.
 126 Sohier Road
 Beverly, MA 01915
 ph: 978-922-9300
 fx: 978-922-8374
 [log in to unmask] >>

Hi Phil!

How many places or holes do you have to mask? The reason that I ask is
because if
it's not too many per board, you may want to consider using tapered plugs to
do that.
There's a company called Kinnarney Rubber Company that makes plugs like that,
and the material they use can stand the heat of wave solder. They also make
boots to go over gold fingers to protect them from wave. Go to:

http://www.kinnarney.com/

and you'll see their products. If you use plugs, sure they'll take some time
to install, but you won't have to wait for them to cure like liquid masks.
You'll still have to manually remove them after wave, but you do that now
with latex mask. Lastly, the plugs will be reusable, don't have to keep
buying liquid mask.

-Steve Gregory-

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