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Thu, 2 Sep 1999 00:08:58 +0100 |
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Hi Nicholas,
Here's bare bones details, ask if something doesn't make sense.
Corrections welcome!
First step is common to both make the PTHs conductive - electroless Cu or
more recent chemistry.
Panel plating
Plate the entire panel.
Apply the circuit image using Photoresist
Touch-up/Inspect circuit image - Strip and try again if it's beyond
touch-up
Etch Circuit Image
Pattern Plating
Apply the circuit image using Photoresist
Plate the pattern of the circuit
Inspect - if it's bad toss it
Etch Panel
We use panel plating for inner layers (Copper) and pattern plating for outer
layers (Copper and Tin/Lead).
Pro & Con
A problem with Panel Plating is nonuniformity of the plating thickness
across the board.
We sometimes etch a 'picture frame' from around the circuit/board area.
A problem with Pattern Plating is burning (overplating?) isolated runs.
To minimize this effect we will add nonfunctional pads to isolated runs if
the design allows.
I 'Think' of panel plating being better because inner layers have the
critical dimensions - 5 mil lines and 5 mil spaces stuff.
It really depends on what type/part of the board you are interested in.
'We' (List We) can get into DC versus Pulse versus Reverse Pulse Plating in
the advanced course.
Because I haven't had the pleasure of using anything but DC, yet.
Hans
Air Force Material Command - We keep them flying!
~~~~~~~~
Hans M. Hinners WR-ALC/LYPME Bldg. 640
Materials Engineer 380 Second Street,
Suite 104
Manufacturing Eng. Sec. Robins AFB GA 31098-1638
912-926-1970 (Voice) 468 - 1970 (DSN) 912-926-7974 (Fax)
[log in to unmask]
> -----Original Message-----
> From: Nicholas LAI [SMTP:[log in to unmask]]
> Sent: Tuesday, August 31, 1999 10:06
> To: [log in to unmask]
> Subject: [TN] Plating and pattern plating
>
> Hello
> (1)What is the different between panel plating or pattern plating?
>
> (2)More, I heard that there are two process flows to make the multiayer
> baord on
> plating.
> One is PTH than Panel plating and then pattern plating.
> Second is PTH than pattern plating(there is no panel platting.)
> Which on is better and what is the pros & cons.
>
>
> Best Regard,
> Nicholas Lai
> 9/1/99
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