yes,

Tim is right
what I have mentioned is in deg celcius

Madhu



                      "Tim Reeves"
                      <Tim.Reeves@mem-o        To:       "Rick" <[log in to unmask]>, <[log in to unmask]>,
                      r.com>                    <[log in to unmask]>
                                               cc:
                      26/03/03 04:53 AM        Subject:  RE: Laminate voids & resin recession






I think he means 2.5 deg C/min which is about 4.5 deg F /min, which is
still quite slow. 10-12 might be higher than optimum as well. Many products
recommend 8-12 degF/min or so.
 5 deg C/min (9 deg F/min) is probably safe for just about any FR-4 type
product.
As far as the KISS cycle goes, usually you want to increase to high
pressure at about 200-220F. Earlier is better than later.

Best Regards,
Timothy Reeves
Technical Service Engineer - Matsushita Electronic Materials, Inc.
4114 Heather Street, Forest Grove, Oregon, 97116
Main (503) 357-8695     Direct (503) 992-5109    Cell (503) 781-1495
Fax (503) 357-8868


-----Original Message-----
From: Rick [mailto:[log in to unmask]]
Sent: Tuesday, March 25, 2003 4:14 AM
Subject: Re: Laminate voids & resin recession


2.5 deg/min. is a little slow.  Try and aim for 10-12 deg/min.  The
lower the rate of rise the more viscous the resin which means it
won't flow as much.  Also, try going into full pressure right away.
This will also force the resin to flow.  I've found kiss cycles don't
buy you much plus the operator might forget to go into full pressure
before the resin starts to cure (if you're press doesn't do it
automatically).  Double check your vacuum pressure.  You should
have at least 27 in. Hg.

Rick Babyak
Process Engineer
Proto Circuit Inc.
7 Ascot Parkway
Cuyahoga Falls, OH 44223
330-572-3400
330-572-3434 fax

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