Evan,
A couple of ideas for you:
1) Does your fluxer have the option of one or two direction spraying? I
have found with some machines that have the option, that if you are running
quite a high conveyor speed you need to use the spray on the return
traverse also.
2) If you are running a relatively high conveyor speed, and consequently a
high fluxer traverse speed, I would recommend moving to a larger pitch
fluxer nozzle. This enables you to reduce your traverse speed, still giving
you the coverage, but giving you effectively more penetration time for the
spray.

Hope this helps
Best Regards

Justin Braime - Process Engineer
Alpine Electronics of New Zealand Ltd
----------
> From: Evan D Jones <[log in to unmask]>
> To: [log in to unmask]
> Subject: [TN] spray fluxing
> Date: Wednesday, 1 July 1998 16:49
>
> We installed a spray fluxing system on our wave solder machine, based on
a
> Nordson pulse sprayer, a couple of months or so back but have been having
> some problems getting good results. The system utilises a single spray
> nozzle with a fan pattern. The problems we have seen are poor barrel fill
> (presumably due to flux not penetrating PTH barrels), and shadowing
effects
> on bottomside surface mount components.
>  We are using a no clean flux. I tried using an active flux, with the
same
> results, which suggests it is the sprayer setup which is the problem. If
> anyone has some experiences that they can share with me regarding
> successful implementation of airless spray fluxing systems I would be
most
> appreciative. What factors influence penetration? spray pressure?
> extraction?
> Up until now we have been using a foaming fluxer with reasonably good
> results (except for difficulty controlling no-clean residue levels).
>
>
> Regards Evan
>
> Evan Jones
> Manufacturing Engineer
> Bluegum Technology Pty Ltd
> PO Box 609, Wangaratta, Australia, 3676
> Ph: 61 3 5720 2539     Fax: 61 3 5720 2412
> Internet:  [log in to unmask]
>
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