Hi Evan, I'm not directly familiar with the Nordson sprayer, but I may be able to shed some light on some of the other issues. We use an Electrovert SUPA-Spray unit [(which is actually built by Ultrasonic Systems, Inc.) This is not an advertisment for the equipment, just an identification for illustrative purposes]. It consists of a tank for the flux which is pressurized with nitrogen and this is also the delivery propellant. Compressed air is used to drive the reciprocating head that has the nozzle. I also use a fan pattern spray. I am also using a no-clean flux. Some things to look at are: - What is the conveyor speed. If the board is travelling too fast in the system, you may get shadowing and areas that are missed. - If your system has a traversing head like mine, what is the speed of the travel. Same shadowing as above. This may need to be adjusted in concert with the conveyor speed. - Try adjusting the spray pressure. - Try a different nozzle. A higher speed on either the conveyor or traversing head will mean that there is less time to apply a specific quantity of flux. Although we use primarily single sided boards, I just received a prototype of a double sided board and I am now investigating the same thing. Hope this helps, Jared Lang Manufacturing Engineer Minarik Corp. 901 E. Thompson Av. Glendale, CA., 91201 818-637-7450 > ---------- > From: Evan D Jones[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;[log in to unmask] > Sent: Tuesday, June 30, 1998 9:49 PM > To: [log in to unmask] > Subject: [TN] spray fluxing > > 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] > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################