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April 2000

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Subject:
From:
Joel Brock <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 5 Apr 2000 12:37:39 -0500
Content-Type:
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We are working on Continuous Flow.  However, we have a problem with wet PCBs.
We would like to go directly from our Wave Washer to two Final Assembly steps
and then over ICT.  We currently are evaluating an Electrovert Aquastorm 100
Washer with four dry stations:

    Dry Station # 1 - 15 hp Electrosonic Air Knives
    Dry Station # 2 - 7.5 hp Electrosonic Air Knives
    Dry Station # 3 - 7.5 hp Electrosonic Air Knives
    Dry Station # 4 - 7.5 hp Standard Air Knives & IR Heat

We still have problems with wet PCBs, especially connectors and tape.

I have been told that IR Heat does nothing to dry out PCBs.  From those that I
have talked to, it appears that "bone dry" PCBs comes from hot air only (around
200 F or higher), unless you bake (we prefer something inline).

I have seen and tested PCBs in a TREK Vulcan Drying Tunnel (reaches 320 F, which
we would not dream of going that high).  I have also been following leads on a
custom Drying Tunnel that Technical Devices has built before, which takes their
Washer Dry Stations and adds heating elements to the Air Knives (reaches around
200 F) in a stand alone inline unit.

Does anyone know of any other options or have any advice?

Thanks!
Joel

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