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May 1998

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Subject:
From:
Neil Maloney <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 4 May 1998 14:48:39 -0500
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----------
From: Neil Maloney <[log in to unmask]>
To: Technet <[log in to unmask]>
Subject: ESD buildup on SMT reels
Date: Monday, May 04, 1998 12:22 PM

Greetings Technet!
   I've got a problem.
   My operator just put a new  7" reel of type 1210-07 1.5K 1/2W resistors
(QTY 4000) on our Mydata PNP machine, only to find that most of the
components are sticking to the cover sheet as it is being pulled back from
the tape.  Upon investigation, I discovered nothing adhesive or "sticky" on
the cover sheet, but the whole reel registers 500 - 3Kv on the ESD meter. I
believe that the
ESD is pulling the the components rght out of their pockets.
    The reel itself is of a typical blue plastic "ESD safe" variety just
like the dozen others on the machine that read "0" on the meter. So it must
be the tape, which is made of "clear" plastic.
     My question is .... is the tape itself made of an inferior grade of
plastic, or was the reel subjected to a massive static charge? My entire
facility, including the bathrooms, is ESD safe. Our inventory is stored in
ESD safe bins. Everybody wears ESD straps here, besides, I don't think Dr.
Tesla himself could generate enough static on his person to zap this reel,
without blowing his finger off.
   The supplier has not returned our phone calls. (Imagine my surprise.)
    Seriously, I am worried that something got in here that is out of our
control.
Has anybody else had this problem?
Did the supplier use bad plastic?
Is the reel of parts finished?
Can I dissipate this charge, or will it build up again when the reel is
back on the machine?
Do vendors ever answer their phones?

Thank you in advance for your replies.



Neil Maloney, Service Technician
Contemporary Control Systems,Inc
2512 Wisconsin Ave. Downers Grove, IL.60515 USA
(630) 963-7070 x132
E-mail: [log in to unmask]
URL: http://www.ccontrol.com

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