Transcript Reflectit Spray Tips Presentation Color

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
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Surface must be clean
Lint Dirt Oil
Contaminant
Substrate determines pretreatment
The greatest single cause of paint failure
is
poor surface preparation
Surface Preparation - Trash Defect
Introduction - Why Spray?
• Increase Quality
• Increase Production
• Reduce Costs - Paint and Labor
• Government Regulations
• Coatings Change
• Maintenance Reduction
Introduction - Have we changed?
Coatings - Wet Film Thickness
Gauge
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.
o
• Standardized at 77 F
Viscosity - Cups
• Accuracy Is Best In Middle
Of Cups Range
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Types Of Cups
Ford
Fischer
Zahn
DIN
Others
Viscosity - Cups
• Accuracy Is Best In Middle
Of Cups Range
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Types Of Cups
Ford
Fischer
Zahn
DIN
Others
Viscosity - Cups Range
Specifications
Zahn 1
Zahn 2
Zahn 3
Zahn 4
Zahn 5
31- 60
19- 60
11 - 60
10 - 60
10 - 60
All times in seconds
Company
Ford 2
Ford 3
Ford 4
37 - 110
23 - 110
16 - 120
Gardner
Viscosity - Cups Range
Specifications
Zahn 1
Zahn 2
Zahn 3
Zahn 4
Zahn 5
31- 60
19- 60
11 - 60
10 - 60
10 - 60
All times in seconds
Company
Ford 2
Ford 3
Ford 4
37 - 110
23 - 110
16 - 120
Gardner
Viscosity - Timing
Atomization - External Mix Air Cap
Atomization - Air Cap Ratings
• Type
– Pressure
– Suction
• Finish Material
– Type
– Viscosity
– Flow Rate
• Operating Pressure Range
• Air Volume (CFM) Required
Atomization - Internal vs External
Mix Caps
Internal
External
Air Spray Guns - Three Ways To
Feed
• Suction Feed
• Gravity Feed
• Pressure Feed
Air Spray Guns – Fluid Feed
Types
Suction
Gravity
Pressure
Air Spray Guns – Major
Components
Atomization - Nozzle Combination
Atomization - Suction vs Pressure
Feed Cap
Suction
Pressure
Atomization - Air Cap Selection
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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)
Spray Gun Technique - Arcing
Spray Gun Technique –
Too Far / Too Close
Spray Gun Technique - Gun
Distances
Spray Gun Technique –
Tilting the Gun
Spray Gun Technique - Vertical
Spray Gun Technique - Pattern
Size
Spray Gun Technique - Open Work
Spray Gun Technique - Horizontal
Spray Gun Technique - Wide Mat'l
Spray Gun Technique - Corners
Troubleshooting - Spray Gun
Fluid 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
Troubleshooting - Spray Gun
Fluid Leaking from Front of Gun
Packing 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
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)
Troubleshooting - Patterns
Right/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.
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
Troubleshooting - Patterns
Split Pattern
Fluid needle adjustment in too
far
Atomization air too high
Fluid pressure too low
Spray Gun Maintenance – Rule #1
Spray Gun Maintenance Lubrication
Use Spray
Gun Lubricant
Spray Gun Maintenance - Air Cap