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November 2005

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Mon, 7 Nov 2005 14:51:25 -0500
Content-Type:
text/plain
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text/plain (156 lines)
        If you place the labels before processing, the labels will take
the punishment easily. In fact some manufacturers of metal casing parts
use labels instead of ink stamping. Do the work ahead of time before
kitting. Metal case component that has a history of not withstanding the
process gets a label.
        Ramon
         

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, November 07, 2005 2:27 PM
To: [log in to unmask]
Subject: Re: [TN] Component marking on metal parts...

Hi Kenny!

Good suggestion, but I'm wondering how tedious is would be to apply the
coating and not get it all over the leads. The coating that gets applied
is a urethane coating...we use Conap CE-1155 and it'll take a few reflow
cycles with no discoloring at all...I've tried it.

The coating idea won't work for all parts though. I know some of the
DC/DC converters (from Interpoint I believe) cannot have any coating on
them at all due to heat dissapation requirements.

I've called and talked with Kyzen, and the 4512P should not affect the
marking. On the occasions that the marking has come off, it has done so
by flaking off, or come off in the piece of tape that we've covered it
with trying to protect it. So it looks like we're going to have to go
through the long and tedious process of taking this issue up with the
component manufacturers...and it's more than just a few. If it were
Kyzen affecting the markings, they would be dissolving off, not flaking.

I appeciate Les Bogert's response in regards to using a label, but that
means you have to record the date code and serial number of the part
before building the assembly so that you can record accurate information
on the label if you need one later...just more paperwork. But, if you
gotta', you gotta'....

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX



|---------+------------------------------>
|         |           "Bloomquist, Ken"  |
|         |           <Ken.Bloomquist@AST|
|         |           RONICS.COM>        |
|         |           Sent by: TechNet   |
|         |           <[log in to unmask]>  |
|         |                              |
|         |                              |
|         |           11/07/2005 12:59 PM|
|         |           Please respond to  |
|         |           TechNet E-Mail     |
|         |           Forum              |
|         |           <[log in to unmask]>; |
|         |           Please respond to  |
|         |           "Bloomquist, Ken"  |
|         |           <Ken.Bloomquist@AST|
|         |           RONICS.COM>        |
|         |                              |
|---------+------------------------------>
 
>-----------------------------------------------------------------------
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  |
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  |       To:       [log in to unmask]@SMTP@Exchange
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  |       cc:       (bcc: Stephen R Gregory/LABARGE)
|
  |       Subject:  Re: [TN] Component marking on metal parts...
|
 
>-----------------------------------------------------------------------
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Hi Ramon,

It's been quite a while since we did this but to the best of my
recollection (it's tough getting older)I believe we applied conformal
coating to component ID after reflow and before any wet processing.

KennyB

-----Original Message-----
From: Dehoyos, Ramon [mailto:[log in to unmask]]
Sent: Monday, November 07, 2005 10:49 AM
To: TechNet E-Mail Forum; Bloomquist, Ken
Subject: RE: [TN] Component marking on metal parts...

        Hi Kenny:
                        Didn't the CC discolored, or better yet darkened
after the reflow oven? I ask this question since the baking temp for CC
is a lot lower than the reflow temp. I am all for it, if it works. I am
just curious.
        Regards,
        Ramon

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