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September 2000

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Subject:
From:
Ed Valentine <[log in to unmask]>
Reply To:
Ed Valentine <[log in to unmask]>
Date:
Mon, 11 Sep 2000 17:16:03 -0400
Content-Type:
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text/plain (69 lines)
Julien - We once had a similar problem and resolved it by slowing down the
conveyor. Assuming the conveyor you are talking about is between equipments,
you should be able to get a variable speed motor to replace the conveyor's
current motor. If the conveyor you are talking about is inside the PNP, that
conveyor's speed may be programmable. Good Luck!

Ed Valentine
Electronics Manufacturing Solutions
8612 Mourning Dove Road, Raleigh, NC 27615
Phone: (919) 270-5145, Fax: (919) 847-9971
Email: [log in to unmask]
Website: http://www.ems-consulting.com

----- Original Message -----
From: "Julien Bouchard" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, September 11, 2000 11:03 AM
Subject: [TN] Displacement of PQFP with heat slug


> Hi everybody,
>         We currently have problems with some PQFP ( 208 and 240 pins )
that have a
> piece of metal mold inside the IC to enhance the thermal exchange. Because
> of this metal, the IC is very heavy, in comparaison of other IC. After
they
> have been place by the pick and place machine, they often move from there
> original position when the conveyor start or stop. It seem that the IC is
so
> heavy, and is inertia is taller than the retention force of the paste. We
> try a lot of solution, but none of them give a good and constant result.
>         We want to know if someone have similar problem and if a good
solutions
> have been found. Thank you.
>
> Julien Bouchard
> Matrox - Process Engineer
> Email : [log in to unmask]
>
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