Subject: | |
From: | |
Reply To: | |
Date: | Fri, 8 Dec 2006 15:28:45 -0600 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
Hi Robert!
As an assembler, it just makes a lot of things easier having silkscreen on the board if there's room. Programming changes, test trouble-shooting, documenting rework, etc.. We build many boards that don't have room for reference designators, but I always advocate silkscreen if there's room.
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Lazzara
Sent: Friday, December 08, 2006 3:22 PM
To: [log in to unmask]
Subject: Re: [TN] Silkscreen Outgassing?
I think the substrate itself is far more hygroscopic than either the mask or the lettering ink.
Unless the inks aren't fully cured.
But to your point: It's quite possible to have a polymer mask and a UV letter screen.
Or combinations including epoxy inks.
So out-gassing, if any, would not necessarily have to be the same for the solder mask as for the silk screen.
But I'm curious: Why letter screen at-all?
- Are these boards being hand assembled?
- Is the lettering functional for repair purposes?
Most of the boards we fab today are so dense you can't even see the post-assembly board. So unless you're hand-popping parts why risk ink-on-pads -- with or without out-gassing?
Think I'll go tear some tags off of pillows...
ROBERT LAZZARA
VP, Business Development
T: (800) 560-9457
F: (800) 878-5566 (y servicio de mensaje espaņol)
E: [log in to unmask]
W:_ www.CircuitConnectUSA.com_ (http://www.circuitconnectusa.com/)
Circuit Connect, Inc.
ISO Certification : UL Listed : RoHS Exports : IPC Member : SMTA Member
---------------------------------------------------
Technet Mail List provided as a 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/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 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
|
|