Sender: |
|
X-To: |
|
Date: |
Fri, 30 Mar 2007 22:10:19 +0100 |
Reply-To: |
|
Subject: |
|
From: |
|
Content-Transfer-Encoding: |
7bit |
In-Reply-To: |
|
Content-Type: |
text/plain; charset="us-ascii" |
MIME-Version: |
1.0 |
Parts/Attachments: |
|
|
Also reduces surface energy to the point that conformal coating materials
can struggle to achieve good adhesion.
Best Regards,
Phil.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Barmuta, Michael
Sent: 30 March 2007 22:03
To: [log in to unmask]
Subject: Re: [TN] UV Bump
Hi John: The short answer is yes, a UV bump can eliminate white hazing.
However there are many causes of white hazing or residue. Look into the
TechNet archives for more info on this.
A UV bump is used on photoimageable soldernmasks in conjunction with a
thermal bake. The bare board typically runs thru a high energy (200+
watt/in) output UV lamp bank in a conveyorized oven. This aids in
further polymerization or crosslinking of photoreactive components along
with the other constituents in the soldermask. Making it less
susceptible to chemical attack and interactions during assembly
processes such as wavesolder/flux and wash.
Regards
Michael Barmuta
Staff Engineer
Fluke Corp.
Everett WA
425-446-6076
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Parsons
Sent: Friday, March 30, 2007 1:13 PM
To: [log in to unmask]
Subject: [TN] UV Bump
Happy Friday!
I am having a conversation with an industry peer and the conversation
has
led to the following question;
"I am not aware of any other ionic cleanliness specs for this board. The
reason our customer is looking for UV bump is that they feel that during
assembly UV bumped boards would not experience white hazing issues. They
are
having some issues with their assembly house in regard to white hazing.
Is
UV bumping a solution to problems with white hazing that occur during
the
wave soldering process?"
I don't have an answer for her. Can anyone provide me with some insight
here?
Regards
John Parsons
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
This message (including any attachments) contains confidential
and/or proprietary information intended only for the addressee.
Any unauthorized disclosure, copying, distribution or reliance on
the contents of this information is strictly prohibited and may
constitute a violation of law. If you are not the intended
recipient, please notify the sender immediately by responding to
this e-mail, and delete the message from your system. If you
have any questions about this e-mail please notify the sender
immediately.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
|
|