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. 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