TECHNET Archives

June 1999

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 21 Jun 1999 20:45:35 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (63 lines)
I saw a demo few weeks ago.  The trick is to use a hand held UV point source
positioned at (almost) glazing angle to the PWB (maximum exposure to the
adhesive) to get under the components.  The unit may have reflective mirrors
to reflect the light in different angles... It took 10 - 15 sec to cure the
adhesive.  I have little concern about the un-exposed photo-activators.
These un-exposed photo-activators will cause instability of the material if
it is not passivated by either thermal cure or other method.  (based on my
out dated knowledge, the excess photo-activators were normally used to
ensure the material reach the full cure easily. If anyone have updated
infor. please let me know).
My 2 cents.
                        jk
At 01:08 PM 6/21/99 +0100, you wrote:
>Iain and other TechNetters
>
>Forgive my ignorance but is there such a material?
>
>I would have thought that a UV adhesive couldn't be used in such an
>application unless you can bend light to get under the component and react
>the photo-initiator.
>
>I thought bending light was tricky so if there are such things, I have some
>applications in mind so would love to hear from the experts.
>
>Regards,
>Graham Naisbitt
>
>[log in to unmask]
>
>Concoat Ltd
>Alasan House, Albany Park
>CAMBERLEY GU15 2PL UK
>
>Tel: +44 (0) 1276 691100  Fax: +44 (0) 1276 691227
><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
><HTML><HEAD>
><META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
><META content="MSHTML 5.00.2314.1000" name=GENERATOR>
><STYLE></STYLE>
></HEAD>
><BODY bgColor=#ffffff>
><DIV><FONT size=2>Iain and other TechNetters<BR><BR>Forgive my ignorance
but is
>there such a material?<BR><BR>I would have thought that a UV adhesive couldn't
>be used in such an<BR>application unless you can bend light to get under the
>component and react<BR>the photo-initiator.<BR><BR>I thought bending light was
>tricky so if there are such things, I have some<BR>applications in mind so
would
>love to hear from the experts.<BR></FONT></DIV>
><DIV><FONT size=2>Regards,<BR>Graham Naisbitt</FONT></DIV>
><DIV>&nbsp;</DIV>
><DIV><FONT size=2><A
>href="mailto:[log in to unmask]">[log in to unmask]</
A></FONT></DIV>
><DIV>&nbsp;</DIV>
><DIV><FONT size=2>Concoat Ltd<BR>Alasan House, Albany Park<BR>CAMBERLEY
GU15 2PL
>UK</FONT></DIV>
><DIV>&nbsp;</DIV>
><DIV><FONT size=2>Tel: +44 (0) 1276 691100&nbsp; Fax: +44 (0) 1276
>691227</FONT></DIV></BODY></HTML>
>

ATOM RSS1 RSS2