Sender: |
|
Subject: |
|
From: |
|
Date: |
Sat, 18 Jul 1998 01:13:00 -0400 |
Reply-To: |
|
Parts/Attachments: |
|
|
Technetters.
We are manufacturing multilayer printed circuit boards.
One of our customers request us to make 6 layer memory module
board(7"X6.3"X0.05"t) of which bow tolerance is Max 0.30%.
It's very tough job.
Our 1st yield for that board is lower than 80%.
Lamination stack height, heating rate, cooling rate, cushion material, layup
construction, coppper balance, baking....
These parameters which I thought related with flatteness were tested many
times. But we still see bowed boards(Max 0.70%).
I will make every effort to make SUPER FLAT BOARD.
Any advice would be appreciated.
Thanks in advance.
Herold Green
----------------------------------
-----------------------------------------------------------
EasyPost - the FREE web based email service from EasySpace
Visit http://www.easyspace.com for the best deals on
virtual servers - just US$ 8.50 /month for 100 Meg webspace
with your domain name and Frontpage 98 extenions.
----------------------------------------------------------
################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE TechNet <your full name>
To unsubscribe: SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|
|
|