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October 2010

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Subject:
From:
John Goulet <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 12 Oct 2010 16:03:35 +0000
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Sounds like the technician isn't carefully bending the coupon back and forth to carefully break the V score. 

If the couponis just bent down until it breaks then there is a tearing action, resulting in halowing and delamination. 

The other possibility if the length is long is that the correct tool wasn't provided or the vendor isn't actualy holding the tolerance on the depth of the V-score. In the Grainger catalog there is a welder vice grip which has two large plates welded to a pair of vice grips. 

This hand tool spreads the stress evenly across the break-away rail or coupon and will prevent delamination if used correctly. 

I've had that happen several times with one vendor. 

When possible on long straight V score, the panel should be separated on a depanel machine.http://www.seetrax.com/vcutsep.htm 

These least expensive type is like a pizza cutter.The more expensive depanelers are routers. 
-----Original Message----- 
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei 
Sent: Thursday, October 07, 2010 8:55 PM 
To: [log in to unmask] 
Subject: [TN] Haloing/Delamination to edge of board 

Dear All, 
  
We have test coupon attached to our main board. Though V-groove is used, 
we have occasionally cases of haloing or delamination when the test 
coupon is break off from the main board. There are few cases whereby the 
delamination or halo is >3mm but <50% of the acceptance criteria called 
for. Is there any proof solution to this issue? 
  
Thanks and Regards, 
~ Wee Mei ~ 

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