TECHNET Archives

November 1998

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Ed Cosper <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 6 Nov 1998 04:06:35 -0600
Content-Type:
multipart/mixed
Parts/Attachments:
text/plain (2830 bytes) , application/ms-tnef (3007 bytes)
Hi Connie,

Yes I have heard and used the term "shiner" before but only in the context of a small bright spot on the copper. what you are describing sounds like it could be one of two things.

1.  Pink ring. - If the board is a multilayer and the spots are 
                      located around or between holes that have either 
                      large internal plane or pad. This could be what you 
                      are seeing. 

2. Pregel  - This is a term I haven't used in a while but sometimes 
                  you can get what looks likes small white spots just 
                  below the surface of the laminate. This can be 
                  caused by permature curing of the resin during the 
                  lamination process. I used to deal with this condition 
                  frequently when I worked with BT resin lamininate a 
                  few years ago. 

In either case, if there is not evidence of actual separtion I don't think it will cause you any problems. However, without actually seeing the condition, this is just a guess. Sorry I could be more helpful.

Ed Cosper
Director Quality Assurance and Engineering
Graphic Electronics Inc.
Tulsa OK.

----------
From:   Connie Korth
Sent:   Thursday, November 05, 1998 9:41 AM
To:     [log in to unmask]
Subject:        [TN] Bare Board imperfections

                Good Morning,

I don't know how to explain this, but here goes... I have a bare board with,
what appears to be, delamination but I don't think it is.(can't identify any
layer separation).  There are four spots in the board (not on surface) that
are much lighter than the rest of the board.  These areas are in line with
each other.  Someone said it looked like a 'shiner'.  Has anyone heard this
term before?  If so, what is it, what causes this condition, and is there
any document referring to the acceptability of the condition?  I looked
through the IPC-A-600, but couldn't find anything that resembled this.

From someone who's trying to learn...
ps(I'm not real familiar with bare board acceptability conditions like this
so be gentle)

Connie Korth
K-Byte Hibbing Manufacturing

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################




ATOM RSS1 RSS2