binks spray tips
DESCRIPTION
Binks Spray Tips. July 2010. 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 - PowerPoint PPT PresentationTRANSCRIPT
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Binks Spray Tips
July 2010
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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 - 110Zahn 2 19- 60 Ford 3 23 - 110Zahn 3 11 - 60 Ford 4 16 - 120Zahn 4 10 - 60Zahn 5 10 - 60
All times in seconds Gardner Company
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Viscosity - Cups Range Specifications
Zahn 1 31- 60 Ford 2 37 - 110Zahn 2 19- 60 Ford 3 23 - 110Zahn 3 11 - 60 Ford 4 16 - 120Zahn 4 10 - 60Zahn 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 NutPacking nut loosePacking worn or dry
Air leaking from front of gunSticking air valve stemForeign matter on air valve or seatWorn or damaged air valve or seatBroken air valve springBent valve stemAir valve gasket damaged or missing
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Troubleshooting - Spray GunFluid Leaking from Front of GunPacking nut too tight.Fluid tip or needle worn or damagedForeign matter in tipFluid needle spring brokenWrong size needle or tipDry packing
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Troubleshooting - Spray Gun
FlutteringMaterial 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 HeavyReverse 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 HeavySpreader 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 PatternFluid 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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