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Binks Spray Tips
November 2008
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Surface Preparation - General• Anything you don’t want to see in the final
finish must be removed from the surface
• Surface must be clean • Lint Dirt Oil• Contaminant• Substrate determines pretreatment
The greatest single cause of paint failure is poor surface preparation
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Surface Preparation - Trash Defect
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Introduction - Why Spray?
• Increase Quality
• Increase Production
• Reduce Costs - Paint and
Labor
• Government Regulations
• Coatings Change
• Maintenance Reduction
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Introduction - Have we changed?
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Coatings - Wet Film Thickness Gauge
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Viscosity - Characteristics
• The Property Of Liquid Which Enables It To Resist Flow
• Measured By The Time Required For A Given Volume Of Liquid To Flow Through A Small Hole In The Bottom Of A Metal Cup Under Controlled Conditions.
• Standardized at 77o F
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Viscosity - Cups
• Accuracy Is Best In Middle
Of Cups Range
Types Of Cups• Ford• Fischer• Zahn• DIN• Others
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Viscosity - Cups
• Accuracy Is Best In Middle
Of Cups Range
Types Of Cups• Ford• Fischer• Zahn• DIN• Others
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Viscosity - Cups Range Specifications
Zahn 1 31- 60 Ford 2 37 - 110
Zahn 2 19- 60 Ford 3 23 - 110
Zahn 3 11 - 60 Ford 4 16 - 120
Zahn 4 10 - 60
Zahn 5 10 - 60
All times in seconds Gardner Company
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Viscosity - Cups Range Specifications
Zahn 1 31- 60 Ford 2 37 - 110
Zahn 2 19- 60 Ford 3 23 - 110
Zahn 3 11 - 60 Ford 4 16 - 120
Zahn 4 10 - 60
Zahn 5 10 - 60
All times in seconds Gardner Company
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Viscosity - Timing
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Atomization - External Mix Air Cap
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Atomization - Air Cap Ratings
• Type– Pressure
– Suction
• Finish Material– Type
– Viscosity
– Flow Rate
• Operating Pressure Range
• Air Volume (CFM) Required
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Atomization - Internal vs External Mix Caps
Internal External
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Air Spray Guns - Three Ways To Feed
• Suction Feed
• Gravity Feed
• Pressure Feed
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Air Spray Guns – Fluid Feed Types
Suction Gravity Pressure
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Air Spray Guns – Major Components
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Atomization - Nozzle Combination
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Atomization - Suction Vs Pressure Feed Cap
Suction Pressure
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Atomization - Air Cap Selection
• Volume of air (CFM) available
• Material feed system: suction or pressure
• Type and volume of material to be sprayed
• Size of fluid tip
• Size and nature of object being sprayed– (Pattern size)
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Spray Gun Technique - Arcing
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Spray Gun Technique – Too Far / Too Close
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Spray Gun Technique - Gun Distances
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Spray Gun Technique – Tilting the Gun
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Spray Gun Technique - Vertical
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Spray Gun Technique - Pattern Size
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Spray Gun Technique - Open Work
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Spray Gun Technique - Horizontal
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Spray Gun Technique - Wide Mat'l
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Spray Gun Technique - Corners
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Troubleshooting - Spray GunFluid Leaking from Packing Nut
Packing nut loose
Packing worn or dry
Air leaking from front of gun
Sticking air valve stem
Foreign matter on air valve or seat
Worn or damaged air valve or seat
Broken air valve spring
Bent valve stem
Air valve gasket damaged or missing
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Troubleshooting - Spray Gun
Fluid Leaking from Front of GunPacking nut too tight.
Fluid tip or needle worn or damaged
Foreign matter in tip
Fluid needle spring broken
Wrong size needle or tip
Dry packing
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Troubleshooting - Spray Gun
Fluttering
Material Level Low
Fluid Passage Obstruction
Loose or damaged fluid tip/seat
Dry or loose needle packing
Material too heavy (suction)
Air vent clogged (suction)
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Troubleshooting - PatternsRight/Left - Top/Bottom Heavy
Reverse the air cap 180o. If the problem reverses, the problem is with the air cap. If not, the problem is with the fluid tip/needle.
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Troubleshooting - Patterns
Center Heavy
Spreader adjustment in too far
Atomizing pressure too low
Fluid pressure too high
Fluid tip incorrect size for material and flow
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Troubleshooting - Patterns
Split Pattern
Fluid needle adjustment in too far
Atomization air too high
Fluid pressure too low
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Spray Gun Maintenance – Rule #1
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Spray Gun Maintenance - Lubrication
Use Spray Gun Lubricant
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Spray Gun Maintenance - Air Cap
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