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