Seems like your conveyor rollers (usually black) are deteriorating and need
to be replaced. Filtering can't stop the degradation, also check to assure
rollers are freely moving and that one or two are not stuck in place and
skidding on the panels creating black marks/tracks.

I hope this helps.

Russ Burdick






>From: [log in to unmask]
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,
>[log in to unmask]
>To: [log in to unmask]
>Subject: [TN] Black particles in Micro etch bath
>Date: Thu, 7 Nov 2002 11:46:31 +0530
>
>   Hi folks
>
>
>
>We are using combination of sulfuric acid and hydrogen peroxide as micro
>etchant.  We are getting black particles in the bath which sits on
>conveyors and also transfered on to the panels.
>
>We have fixed a offline filteration system for the bath from last few
>weeks, the problem has come down  slightly. We are cleaning all the
>conveyor rods daily to avoid  the black particles coming on the panels. But
>this has also very less impact.
>
>
>Pls suggest a way out.
>
>thanks in advance.
>
>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. If you have received this email in error please notify
>the mail system admin at AT&S India Limited [log in to unmask]
>
>This footnote also confirms that this email message has been swept by
>MIMEsweeper for the presence of computer viruses.
>
>www.mimesweeper.com
>**********************************************************************
>
>---------------------------------------------------
>Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
>To unsubscribe, send a message to [log in to unmask] with following text in
>the BODY (NOT the subject field): SIGNOFF Technet
>To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at: http://listserv.ipc.org/archives
>Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
>information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
>ext.5315
>-----------------------------------------------------


_________________________________________________________________
STOP MORE SPAM with the new MSN 8 and get 2 months FREE*
http://join.msn.com/?page=features/junkmail

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------