Subject: | |
From: | |
Date: | Tue, 8 Jul 1997 07:19:46 +0300 (IDT) |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
We need some basic information on application of ultrasonic vibrators for
vertical , racks operated PTH line . We are plating 0.25 , 0.30 and 0.35 mm
via holes . Desmear process is applied off PTH line . In some of small via
holes we found round , circular voids in the center of the hole . It looks
like typical void created by air bubble . We have allready pneumatic
vibratotrs in the PTH line , but we intend to install ultrasonic vibrators
in the conditioner , which is the first solution in the line . The questions
are :
1 ) Power ( watts ) per plated area ? Does it depends on hole size and
board thickness ?
2 ) Recommended frequencies ?
3 ) What is the recommended distance between the transducer and the boards?
4 ) What percentage of the energy actually reach the center of the hole ?
How distance between the transducer and the board affect the amount of
ultrasonic energy that actually reach the board ?
All practical recommendations will be appreciated !
Edward Szpruch
Eltek Ltd - Israel
Tel 972 3 9395050
Fax 972 3 9309581
E-mail : [log in to unmask]
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]> *
* with <subject: subscribe/unsubscribe> and no text in the body. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|