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June 1998

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Subject:
From:
Paul Klasek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 18 Jun 1998 09:18:07 +1000
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text/plain
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Eden ,
if you have camelot you can have a dual needle with preset foot relating
you the exact separating height ;
the placement force does not apply as far as I know .
Picture basically two needles with a touch foot beside in calibrated
offset .
As you take off sideways , after dual dispense , you can not string into
each pad .


Contact Shaafi : [log in to unmask]
he knows better than most , and can provide you with an actual custom
solution . He would recommend you volume dispensed as well .
They have a special kit for measuring the volume as well .

See you

Paul Klasek
http://www.resmed.com

> ----------
> From:         by Dr. Eden Chen
> XianSong[SMTP:[log in to unmask]]
> Sent:         Monday, 15 June 1998 13:35
> To:   [log in to unmask]
> Subject:      [TN] Conductive Epoxy for Solder termination
>
>      Dear Sir,
>
>      Some silver-filled conductive epoxies in the market claim to be
> solder
>      replacement, but successful use of these material require a very
> good
>      understanding of the epoxies properties, the process and CTE
> mismatch.
>
>      The epoxy can be deposited to the pad by stencil printing or
>      dispensing,
>
>      Dispensing process has the tailing problem which can cause short
> for
>      0402 chip resistor/capacitor.  It is very difficult to form the
> fillet
>      for epoxy, because the epoxy may have a gap between the side of
> chip
>      resistor/capacitor and dot peak of epoxy.  How much should the
>      placement force be applied and how big should the dot size for
> 0402
>      resistor/capacitor?
>
>      I like to discuss the above-mentioned issue in the TECHNET
>
>      Eden
>
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