I have at previous employers.

Changing the nozzle (or gun) is required if the viscosity changes beyond
the limits of the nozzle.

Some spray systems are incompatable with some of the newer coatings.
Moisture sensitive materials should not use systems where moisture laden
air contacts the coating before it exits the gun (common on some types of
atomization systems).

A 33% solids coating requires .006 in of deposit for .002 of coating
thickness, while solventless material only needs app. 1 mm of coating. Some
nozzles cannot handle the lower flow rate.

Also, some suppliers do not totally understand the new coatings, yet.

In short, it depends upon the coating and the gun.

Aric Parr
-------------
Original Text
From: C=US/A=INTERNET/DDA=ID/TechNet(a)IPC.ORG, on 4/17/98 7:12 AM:
Hi Technetters

Can anyone provide information about experiences with new solventless
coatings on Selective Coating equipment.

Have you been obliged to change application heads or use special dispense
pressures? We are trying to help out some customers who are receiving
conflicting information and would appreciate any TechNetter input

Kindest regards

Graham Naisbitt - Concoat Ltd
Alasan House
Albany Park
Camberley, Surrey GU15 2PL UK

Tel: +44 (0) 1276 691100
Fax: +44 (0) 1276 691227

E-Mail: [log in to unmask]
Regards, Graham Naisbitt

Concoat Ltd
Alasan House, Albany Park
CAMBERLEY GU15 2PL
UK

Phone: +44 (0)1276 691100
Fax: +44 (0)1276 691227

email: [log in to unmask]

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