Industrial/Automotive/Aviation Coatings. Overview Market – Industrial / Aerospace / Body Shop ...
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Transcript of Industrial/Automotive/Aviation Coatings. Overview Market – Industrial / Aerospace / Body Shop ...
Industrial/Automotive/Aviation Coatings
Overview
Market – Industrial / Aerospace / Body Shop
Distribution – Filtration / Spray Specialist
Industrial User Profile
Overspray Isn’t Dust!
Selection Factors
Parts Booth
Typical Industrial Application
• Finishing processes producing airborne overspray while applying protective and/or decorative coatings to items being manufactured for resale
Both are conveyor booths
Market – Industrial / AutomotiveAerospace
Body Shop - Refinishing
Aviation - Refinishing
Industrial Finisher
Fabricated Metal Products
Appliance & HVAC
Industrial User – Con’t.
Agricultural & Off-Road Equip.
Marine
Recreational Vehicles
Wood Furniture & Products
Industrial User – Con’t
Metal Panels
Die Castings
Paint Booths
Paint Terminology
• Thermoplastic or Thermoset• VOC• Solvent Test• Dry and Wet Mils• Flash Time
Paint Terminology – Con’t
• Dry Time• Cure Time• Pot Life• 15 Degree rule• Wet on Wet
Overspray
Properties vary widely, depend upon the coating’s chemistry
Hi-solids, solvent thermosets
Solvent-based, air-dry
Waterborne, thermosets
Waterborne, air-dry
Catalyzed – chemically cured
Specialty – adhesives, gel-coats
Overspray
Is wet on arrival
May or may not dry while in the media
Droplet size ranges from <5 to >100May be electrically charged
Is entrained in a relatively low velocity air streamPneumatic Controls
Overspray Selection Factors
Must give consideration to
Overall PROCESS needs:
–Spray booth dynamics
–Atomization technology
–Coatings being sprayed
–Disposal constraints
–Regulatory constraintsWood Furniture on Conveyor
Overspray Selection Factors
Copyright National Air Filtration Association2006 Rev. 1
Booth Considerations:
Relative location of painter, substrate, & filters
Ave. air velocity (80 – 350 FPM) & direction
Exhaust fan performance curves (determine impact loading has on air movement)
Helicopter Fuselage
Atomization Technology determineschallenge size
Method Drop Size> 100< 5
Air (Conventional)
High VolumeLow Pressure
Air Assist Airless
Airless
Electro-Static Mini-Bell
Overspray Selection Factors
Mini-Bell Painting Enclosure
Paint Kitchen
Copyright National Air Filtration Association2006 Rev. 1
40 CFR Part 63 subpart HHHHHH
• All spray booths, preparation stations, and mobile enclosures must be fitted with a type of filter technology that is demonstrated to achieve at least 98-percent capture of paint overspray. The procedure used to demonstrate filter efficiency must be consistent with the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Method 52.1, “Gravimetric and Dust-Spot Procedures for Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter, June 4, 1992” (incorporated by reference, see §63.14 of subpart A of this part). The test coating for measuring filter efficiency shall be a high solids bake enamel delivered at a rate of at least 135 grams per minute from a conventional (non-HVLP) air-atomized spray gun operating at 40 pounds per square inch (psi) air pressure; the air flow rate across the filter shall be 150 feet per minute. Owners and operators may use published filter efficiency data provided by filter vendors to demonstrate compliance with this requirement and are not required to perform this measurement. The requirements of this paragraph do not apply to waterwash spray booths that are operated and maintained according to the manufacturer's specifications
Aviation Market
Environmental Protection Agency
Test Method 319• Aerospace & Aircraft
– 319 Chromate Recovery System uses either a two-stage or three-stage paint overspray recoverysystem.
Disposal Considerations:
Check Coating MFG & MSDS for Hazardous Air Pollutants (HAPS)
Hazardous Materials
–Incinerate in cement kiln
–Deposit in hazardous landfill
Non-Hazardous Materials
–Sanitary landfill
–Industrial boiler supplemental fuel
Any additional requirements
Summary
• Understand the application, type of paint and overspray characteristics
• Understand the spray booth operational specifications
• Select your arrestor filter based upon efficiency, airflow and paint holding capacity – use test results
• Know local, state and federal disposal regulations