Hi Karen,

We too have had problems with parts flipping over in carrier tape whilst on
feeders.

Like some other respondents it is largely confined to plastic carrier tapes,
with SOT23, 0603 and 0402 being the worst culprits. As well as some of the
solutions already mentioned I have found that the peel strength of cover
tapes on plastic carrier tapes can vary widely on the same length of tape,
producing a 'snatching' movement when a higher peel strength section is
followed by a lower peel strength, pitching the part over within the pocket.

Like other respondents switching exclusively to paper tapes has more or less
eliminated this. Even if the cover tape peel strength varies along the way
it tends to peel away with some of the top layer of the paper tape still
attached, evening out the peel strength variations.

As for SOT23 we still occasionally have problems due to the requirement for
formed pockets, but have found cover tapes with pressure sensitive adhesive
more consistent than the heat sensitive variety.

Hope this is helpful,

Peter Barton

===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
21/10/03 12:42
>Hi Karen,
>
>I too have seen this problem. We were having this occur mainly on 0402s
>and 0603s that were packaged in plastic tape. We did not have this
>problem on any of the paper tape reels. It appears that the tape
>advancement stress is vibrated easily through the plastic tape but not
>on the paper. When the tape was being pulled away and the part advanced,
>the part would flip in the emboss. If you can adjust your feeders, that
>may help some. I will use paper if given a choice. Good luck!
>
>Danny
>
>
>
>
>        Karen Walters <[log in to unmask]>
>
>
>10/20/2003 04:19 PM
>Please respond to "TechNet E-Mail Forum."; Please respond to
>karen.walters
>
>        To:        [log in to unmask]
>        cc:
>        Subject:        [TN] Parts flipping in Pocket Carrier Tape on
>Pick and Place Machine
>
>
>
>Hi All
>
>I just want to see if anyone has experienced parts flipping in Pocket
>Carrier Tape on Pick and Place Machine and if you could help me identify
>
>some potential root causes.
>
>Thanks
>Karen
>
>
>
>
>
>
>
>
>
>
>
>
> EXAMPLE:
>
> TO:
>            <forum name>@ipc.org
> SUBJECT:
>            <your subject>
> MESSAGE:
>            <your message>
>
>
>
>
>
>
>
>
>Karen Walters
>Customer Quality Engineer
>SKYWORKS Solutions, Inc.
>20 Sylvan Road
>Woburn, MA 01801
>t. 781.376.3599
>f. 781.376.3320
>c.781.844.2227
>
>---------------------------------------------------
>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 847-509-9700
>ext.5315
>-----------------------------------------------------
>
>
>
>---------------------------------------------------
>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 847-509-9700
ext.5315
>-----------------------------------------------------


-----------------------------------------------------------------------
Peter Barton
Senior Process Eng
ACW Technology Ltd
Dinas Isaf West
Tonypandy
Mid Glamorgan. CF40 1XX  Wales

Tel: 01443 425200
Fax:  023 8048 4882
International Tel : +44 1443 425200
International Fax : +44 23 8048 4882
Website/URL:  www.acw.co.uk

---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------