High-solids paint overspray aerosols in a spray painting booth: particle size analysis and scrubber efficiency
Particle size distributions of high-solids acrylic-enamel paint overspray aerosols were determined isokinetically in a typical downdraft spray painting booth in which a 7-stage cascade impactor was used. Three different industrial paint atomizers were used, and the paint aerosols were characterized before and after a paint both scrubber. The mass median aerodynamic diameter (MMAD) of a metallic basecoat and an acrylic clearcoat paint aerosol from air-atomized spray guns ranged from 4-12 ..mu..m and was dependent on atomization pressure. When the paint booth was operated under controlled conditions simulating those in a plant, the collection efficiency of paint overspray aerosols by a paint scrubber was found to be size dependent and decreased sharply for particles smaller than 2 ..mu..m to as low as 64% for clearcoat paint particles of 0.6 ..mu..m. Improvement in the overall particulate removal efficiency can be achieved by optimizing the spray painting operations so as to produce the least amount of fine overspray paint aerosols less than 2 ..mu..m. Maintaining a higher static pressure drop across the paint both scrubber also will improve scrubber performance.
- Research Organization:
- General Motors Research Labs., Warren, MI
- OSTI ID:
- 5018040
- Journal Information:
- Am. Ind. Hyg. Assoc. J.; (United States), Journal Name: Am. Ind. Hyg. Assoc. J.; (United States) Vol. 47:7; ISSN AIHAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOL MONITORING
AEROSOLS
AIR POLLUTION MONITORING
ATOMIZATION
CASCADE IMPACTORS
COATINGS
COLLOIDS
DATA
DISPERSIONS
EFFICIENCY
EQUIPMENT
EXPERIMENTAL DATA
INFORMATION
MONITORING
NUMERICAL DATA
OPTIMIZATION
PAINTS
PARTICLE SIZE
PARTICLES
PARTICULATES
POLLUTION CONTROL EQUIPMENT
PRESSURE DEPENDENCE
REMOVAL
SCRUBBERS
SIZE
SOLS