I also have an SCS precision coat machine.
Your "spray" pressure should be 1-3 psi, your "coating" pressure should be
somewhere around 11-12 psi if you are using the atomizing head. There is
also a fine tune knob on top of the actual valve to fine tune the spray
pattern. If you have to turn the pressure up higher to get it to spray then
it is probably clogged. Dis-assemble and clean. If you are using the
dispensing needle, the "coating" pressure is the only one that needs to be
adjusted and obviously that needs to be controlled to a smooth flow.

Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com


On Tue, Feb 25, 2014 at 3:47 PM, Richard Kraszewski <
[log in to unmask]> wrote:

> Can you tell me whose system and valve you are using ?
>
> Rich Kraszewski
> PLEXUS
> (920)969-6075
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of grandrien
> Sent: Tuesday, February 25, 2014 12:30 PM
> To: [log in to unmask]
> Subject: Re: [TN] Automated conformal coating
>
> Henry,
> Just few common causes we ve experienced in the past:
> - viscosity
> - improper varnish loading in the canister when it contains air bubbles.
> Certain outgassing time is necessary.
> - Splashing over high components.
> - Non suitable coating nozzle routing. It is preferable to coat from
> components specially high ones aways or at 90° along some components.
> - of course too high air pressure or nozzle speed,
> - different spray width can be considered. Try finer spray.
>
> Hope it can help a little
> Grandrien
> ========================================
> Message du 25/02/14 18:51
> De : "Ioan TEMPEA"
> A : [log in to unmask]
> Copie à :
> Objet : Re: [TN] Automated conformal coating
>
> Henry,
>
> There should not be any issues with automated CC, if the programming is
> properly made!
>
> I'm sure SCS can help you troubleshoot (pressure, nozzle type, etc.), but
> I just want to draw your attention that splattering might not be only from
> bouncing coating, but also droplets coming straight from the nozzle,
> especially at points where the coating direction changes. Sharp angles in
> head movement and spray head rotation will always generate splashes.
> Also, do you validate the viscosity of the diluted coating, Zahn cup, or
> you simply rely on combining the right volumes?
>
> Regards,
>
> Ioan Tempea, P. Eng.
> Manufacturing Engineer
> Satellite Systems
> MDA
> 21025 TransCanada Highway
> Ste-Anne-de-Bellevue, Qc, Canada H9X 3R2
> Tel: +1-514-457-2150-3556
> www.mdacorporation.com
>
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> -----Message d'origine-----
> De : TechNet [mailto:[log in to unmask]] De la part de Henry Rekers
> Envoyé : Tuesday, February 25, 2014 12:23 PM
> À : [log in to unmask]
> Objet : [TN] Automated conformal coating
>
> Hello technetters....
>
> One of our plants is trying to implement an automated conformal coating
> process and we are running into some issues with our material. It seems
> that the coating is "bouncing" off the board and splattering over the rest
> of the board.
>
> My first thought, probably just like yours, is too much air pressure. But,
> does the collective have any other suggestions?
>
> The material is humiseal 1a33, it's thinned with humiseal 521 (60:40) and
> it's and SCS coating machine.
>
> Thanks in advance.
>
>
>
> _____________________________________________________________________________________
>
>
> Henry Rekers P. Eng | Schneider Electric | Global Supply Chain |
> Senior Manufacturing Engineer
> Phone: +1-250-652-7100 ext. 7510 | Toll Free: +1-866-466-7627 ext.
> 7510 | Fax: +1-250-544-2390 |
> Email: [log in to unmask] | Site:
> www.schneider-electric.com | Address: 2195 Keating Cross Road,
> Saanichton, BC, Canada, V8M 2A5
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