The Nordson system has no hole filling problems, but uses extremely high
pressure airless spray.

At a previous employer, we had one panel where we placed the nozzle off
center to avoid shadowing. That panel is now soldered with a reciprocating
fluxer, and the Nordson fluxer(s) were moved to other lines where that
problem could not occcur.

ARIC PARR
Sr. Manufacturing Engineer
Eaton Corp
1400 S. Livernois
P. O. Box 5020
Rochester Hills, Mi 48308-5020
[log in to unmask]
248 608 7780
Fax: 248 656 2242
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 7/1/98 1:09 AM:
To: Aric Parr@01635@Lectron_RH,
EatonWHQ@CorpMail@WHQCleveOH[C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG]

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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