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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