Binks Spray Tips November 2008

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

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. Standardized at 77 o F

Viscosity - Cups Accuracy Is Best In Middle Of Cups Range Types Of Cups Ford Fischer Zahn DIN Others

Viscosity - Cups Accuracy Is Best In Middle Of Cups Range Types Of Cups Ford Fischer Zahn DIN Others

Viscosity - Cups Range Specifications Zahn Ford Zahn Ford Zahn Ford Zahn Zahn All times in seconds Gardner Company

Viscosity - Cups Range Specifications Zahn Ford Zahn Ford Zahn Ford Zahn Zahn All times in seconds Gardner Company

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 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 180 o. 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