Hi Howard,
Aren't styrofoam balls a Non ESD
material? We don't use it, though parts may come in baggged with peanuts
around that. It seems to me that styro-balls would be "staticy"--as you
describe them sticking to your assemblies--as well as having out-gassing
properties, though I can't say if a board in an ESD bag would be so
affected, and what dependence exposure time might have, as if that is
even relevant. (Sounds like all kinds of new threads developing here) I
know they have plenty of ESD safe treatmentsfor packaging products,
but your problem seems quite annoying. Another example of Purchasing vs.
Engineering or application requirements?
This isn't helping you. I am cuious about the ESD
bit though, and what else may weigh in.
Steve M.
----- Original Message -----
Sent: Friday, February 21, 2003
09:48
Subject: [TN] Styrofoam beads on
PCB's
Dear Technetters,
I don't know if this is a problem that
only we have, but it involves Styrofoam packing beads that show up on the
PCB's that are delivered to our lines. The little beads are all over the
plastic packaging of the individual PCB bundles, and these can eventually
hitchhike onto a PCB that goes into the printer. You can guess what
happens - a bead ends up on a pad or in an aperture and the result is
insufficient or missing solder on one or many boards. Our supplier is in
China or India, and they claim that they must use Styrofoam for packaging.
In my opinion, this is the wrong type of packaging to use, but because
of the low "initial" cost, I don't have too much clout on this issue. Is
anyone else familiar with this problem?
Thanks in advance for all of your opinions - they are
helpful and very valuable to my job!
Howard Watson
SMT Manufacturing Engineer
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