Jim,
We have a captive board shop and use polyimide labels with an acrylic
adhesive to ID the bare boards. These labels are applied at final
inspection, and the numbers are recorded on the inspection record for that
lot. Our bare board artwork contains the corners of the label , so the
location is always indicated on the board itself. The polyimide / acrylic
combination withstands immersion in the wave solder, so we put the labels on
the circuit side and don't take up valuable component-side space.
We presently use .250" x 1.250" labels to accomodate an 8-digit, Code 39
bar code with human readable subscript. (We could reduce the size to
something like .200" x .650", and still keep the human readable numbers if
we went to an Interleaved code 2 of 5 and didn't need alphabetic
characters.) We have used pre-printed, sequentially-numbered labels, and we
have also printed our own, with about equal success. This whole scheme
essentially amounts to serializing the boards, which gives us traceability
in the FAB side, and gives the ASSY group a unique identifier (serial
number)
The assembly group uses indelible ink pens to write various information in
the board, and the test group uses stamp pads for their needs. In the end,
the bar code number is the one that gets recorded at our final gate.
Mike Matson
Manufacturing Engineer
Woodward Governor Company
Fort Collins, CO
(970)498-3285
[log in to unmask],com
----------
From: TechNet-request
To: technet
Subject: Lables for Card Assemblies
Date: Thursday, October 10, 1996 12:26PM
Hi;
We are looking to make our raw printed circuit cards more "friendly"
for labeling/barcoding/etc. at the assembled pc card level, particularly
for our OEM customer base.
I'd like to gather some data on what other assembly houses "like" and
"use" for labeling schemes. Do you prefer adhesive labels or
some marking direct on the pc card? does it help to have white ID
encircle the label location?
Any information, general or specific would be helpful.
thanks!
Jim Herard
Product Quality Engineering
IBM Microelectronics, Endicott Printed Circuit Fabrication
[log in to unmask]
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