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March 2009

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From:
Leland Woodall <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Leland Woodall <[log in to unmask]>
Date:
Wed, 4 Mar 2009 10:37:10 -0500
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Definitely so, Doug.

May want to keep in mind that conductive fibers in ESD gloves can, and
do, cause intermittent electrical shorting.  I've been down that road,
and that's why we use only those made of cotton with neoprene palms in
our facility.

Leland

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, March 04, 2009 10:30 AM
To: [log in to unmask]
Subject: Re: [TN] Gloved Hands / Fingerprints / Failure Articles

Thank you all.  Much appreciated.

Would you all find benefit of a discussion of gloves in manufacturing in

the revision efforts for the IPC Cleaning Handbooks, currenly underway?

Doug Pauls
Rockwell Collins



"Roberts, Jon" <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
03/04/2009 09:14 AM
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Re: [TN] Gloved Hands / Fingerprints / Failure Articles






Doug's 2 cents are worth more than most of can afford.  I did enjoy
learning a new word (recalcitrant)from Mike Fenner.  Jon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, March 04, 2009 8:44 AM
To: [log in to unmask]
Subject: Re: [TN] Gloved Hands / Fingerprints / Failure Articles

Kevin,
I will throw in my two cents worth.  We do not wear gloves in our 
facilities for most of the manufacturing process.  They do in the clean 
rooms and they do after final wash prior to conformal coat.  The rest of

the time it is, in my opinion, a waste of time and money.  Kind of an
odd 
statement coming from me, but here is why I think so.

Gloves are there to prevent finger salts and oils from getting on the 
assembly, where they would be a contamination risk.  Our cleaning 
processes are such that the last cleaning step is a mild one designed to

remove such salts and oils.  The heavier residues have already been 
removed in previous process steps.  So, gloves are not really needed.

Here is why I think it is a waste of money to have gloves on anywhere 
earlier in the process.  The assumption that gloves keep your assemblies

clean is only true while the gloves themselves are clean.  Run your
gloved 
hands through your hair.  New gloves.  Touch a little of that uncured 
adhesive.  New gloves.  Get a little flux from hand soldering on the 
gloves.  New gloves.  You think that the operators are going to change 
gloves that often?  No.  Think the manager for that area is going to 
willingly pay for the truckloads of new gloves.  Hell no.  In some of
our 
areas, the operators that apply silicone RTV adhesive to the boards wear

gloves because that RTV is hard to get off your hands.  Think they
change 
them often?  Nope.  When the boards get to conformal coating, there are 
lots of dewet areas that mysteriously resemble fingerprint sized areas, 
but without the convenient identifying fingerprints.  Even though we 
stress to our operators to handle boards by the edges only, it is 
sometimes just not practical to do so.  Then again, since we have that 
final clean prior to coating, it is not as critical.

Now, if you are a true no-clean facility, that is another issue.  If you

go the route of gloves, I would recommend you stay away from finger cots

and plastic gloves.  They are uncomfortable and when you make the 
operators uncomfortable, bad things happen.  I would highly recommend
the 
use of HyFlex gloves, which you can get from Techni-Tool.  These are 
cotton gloves with heavier rubberized palms and fingers, but the back 
sides of the fingers and back side of the hand are open cotton, allowing

the gloves to breathe. Very comfortable, good tactical feel to them and 
the surface is robust enough that you can clean off residues with mild 
alcohol so they last for a long time.  They cost a little more, but they

are worth the investment considering their cleanability and how long
they 
last.

Doug Pauls
Rockwell Collins



Kevin Glidden <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
03/04/2009 07:26 AM
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[TN] Gloved Hands / Fingerprints / Failure Articles






Hello everyone,
 
We are in the midst of a proposal from myself and manufacturing 
engineering
to require use of gloves or finger cots throughout our PCB assembly 
process.
We had considered that it really would only be required after final
cleaning, but for uniformity would require it all steps including
population.  We have of course met with a real resistance, particularly 
from
the final assemblers who are stating it doesn't matter once the
conformal
coat is on.  I can see at least some logic in that, and admittedly a
large
portion of our argument is aesthetics (we don't want fingerprints on the
boards even after coating), but it would be really nice to have some
sort 
of
scare tactic, like an article or something that related a PCB failure to
fingerprints or handling contamination.  Anyone have such a thing?
 
Thanks!

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