First comment would be "What is wrong with the first underfill?"
Second comment would be "What is the weight percentage of the applied
underfill?" or in other words, how much of the desired amount of underfill
actually got applied?
That being said, I have set up a processs where we applied the underfill in five
separate dispensing steps from one location.....but we never cured in between
the dispensing operations. It would have feasible to have broken it up but
there would have to be room around the part for alternate dispensing sites.
Lastly, you cannot underfill the same area twice.....so "if it meets the
acceptance criteria, why do you want to do it again?"
Phil
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------