 
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0uUH2V-0000CXC; Thu, 13 Jun 96 13:22 CDT |
| Encoding: |
26 TEXT |
| Old-Return-Path: |
|
| Date: |
Thu, 13 Jun 96 13:27:00 CDT |
| Precedence: |
list |
| Resent-From: |
|
| From [log in to unmask] Fri Jun 14 17: |
56:10 1996 |
| Resent-Sender: |
|
| X-Status: |
|
| Status: |
O |
| X-Mailing-List: |
|
| TO: |
|
| Return-Path: |
<TechNet-request> |
| Resent-Message-ID: |
<"JUFuM.0.LAJ.kn5mn"@ipc> |
| Subject: |
|
| From: |
|
| X-Loop: |
|
| X-Mailer: |
Microsoft Mail V3.0 |
| Message-ID: |
|
| Parts/Attachments: |
|
|
Of course, width of the board is a significant factor in warpage but you
also need to consider the following factors:
1. Board thickness
2. Array design (spacing, break-away locations)
3. Material of the board
4. Even distribution of copper layer
5. Number of layer (EVEN prefer)
6. Copper thickness (should be symetric)
7. Dielectric thickness (should be symetric)
8. Web design (Copper filled??)
Thanks
Michael Yuen
----------
From: TechNet-request
To: TechNet
Subject: Assy: max board width
Date: Thursday, June 13, 1996 11:40AM
We are considering changing our board size and are curious about how
wide the boards can be to avoid warping in reflow. We plan on doing 1
and 2 reflows (mostly just one reflow) and we do not have support in
the middle.
|
|
|
