TECHNET Archives

April 2003

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:
"Grabski III, John R." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 23 Apr 2003 09:15:10 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (147 lines)
http://www.molex.com/cgi-bin/bv/molex/home_init.jsp?x=y&BV_SessionID=@@@@166
5438246.1051103604@@@@&BV_EngineID=ccccadciedhgihjcflgcehedffgdfmk.0&langPre
f=english&sNav=/cgi-bin/bv/molex/nav/mxleft_nav.jsp%3FBV_SessionID%3D@@@@166
5438246.1051103604@@@@%26BV_EngineID%3Dccccadciedhgihjcflgcehedffgdfmk.0%26c
hannel%3DProducts&mCnt=/cgi-bin/bv/molex/search/advance_search.jsp%3FBV_Sess
ionID%3D@@@@1665438246.1051103604@@@@%26BV_EngineID%3Dccccadciedhgihjcflgceh
edffgdfmk.0%26searchLeftNav%3Dgo%26searchvalNav%3D70491

-----Original Message-----
From: Hinners Hans M Civ WRALC/LUGE [mailto:[log in to unmask]]
Sent: Wednesday, April 23, 2003 9:09 AM
To: [log in to unmask]
Subject: Re: [TN] Warpage


Hi Madhu,

Have you tried sequential lamination?  Everything below the dummy core is
symmetrical.

Does the warp get worse after route?

I'd also confirm good heat distribution in the hot & cold press pallets.  I
wouldn't be too aggresive with the cool down cycle - it might make the warp
worse.

You could try cross ply prepreg if it's available from your supplier.

First look, I'd say that panel is gonna warp no matter how you process it.

Hans

-----Original Message-----
From: [log in to unmask]
[mailto:[log in to unmask]]
Sent: Wednesday, April 23, 2003 3:04 AM
To: [log in to unmask]
Subject: [TN] Warpage


Fellow technetters,

I am back with the same old problem: bow & twist

we are producing a 14 layer  , cap lamination board for one of our customer

the construction is as shown below:

- - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -
^^^^^^^^^^^^^^^^^^^           1080
- - - - - - - - - - - - - - -  - - - -
**************************          28 mil dummy core
- - - -  - - - -  --  - - - - - - - -
^^^^^^^^^^^^^^^^^^^           2116
 - - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -
^^^^^^^^^^^^^^^^^^^           1080
^^^^^^^^^^^^^^^^^^^           2116
- - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -
^^^^^^^^^^^^^^^^^^^           1080
^^^^^^^^^^^^^^^^^^^           2116
- - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -
^^^^^^^^^^^^^^^^^^^           1080
^^^^^^^^^^^^^^^^^^^           2116
- - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -
^^^^^^^^^^^^^^^^^^^           1080
^^^^^^^^^^^^^^^^^^^           2116
- - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -
^^^^^^^^^^^^^^^^^^^           1080
^^^^^^^^^^^^^^^^^^^           2116
- - - - - - - - - - - - - - - - -  - -
**************************          3 mil core
- - - - - - -  - - - - -  - - - - -  -

Obviously, we are getting warpage in boards
the construction is customer given and he is not ready to change this

Are there any solutions to avoid warp in these boars

cheers,
Madhu




**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the mail system admin at AT&S India Limited [log in to unmask]

This footnote also confirms that this email message has been swept by
MIMEsweeper for the presence of computer viruses.

www.mimesweeper.com
**********************************************************************

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------

ATOM RSS1 RSS2