Parts that can be efficiently coated by dip painting. If considerably larger, parts like these could be painted more efficiently by the flow coating process. (a) Blower wheel. (b) Wire fan guard Equipment for Dip Painting Table 6 Equipment requirements for dip painting two steel production parts Procedure or equipment Angle bracket (a) Spring hanger (b) Production requirements Equipment requirements [...]... powder coatings Direct-fired batch ovens Convection ovens for curing of paint coatings (a) Direct fired (b) Indirect fired Indirect-fired batch ovens Continuous ovens Convection continuous ovens, Indirect-fired continuous convection oven for curing of paint coatings (a) Exhaust system (b) Burner and recirculating fan Radiant continuous ovens Times required for interfaces of two steel parts of equal area... Electrodeposition tank (6) Recirculated permeate rinse (7) Fresh permeate rinse (8) Deionized water rinse (9) Dryoff (10) Curing oven (11) Deionized quench for cooling (12) Offload area (13) Source for direct current (14) To anodes in paint bath (15) To work on conveyor (16) Particle filter (17) Cooler (18) Ultrafilter ( 19) Paint solids return (20) Permeate (21) Controlled flow to waste (22) Permeate storage (23)... Gravelometer Used to measure impact resistance of paint films Table 9 Common causes of paint film defects Defect Cause Susceptible application methods • • • • • • μ Spreading μ x x = ft gal spreading Table 10 Theoretical spreading rate for coatings 13 μm (0.5 mil) 25 μm (1.0 mil) 38 μm (1.5 mils) 51 μm (2.0 mils) 64 μm (2.5 mils) 76 μm (3.0 mils) m2/L Volume solids, % m2/L m2/L m2/L m2/L m2/L ft2/gal C ft2/gal... Book of ASTM Standards, • Paint Testing Manual, Physical and Chemical Examination of Paint, Varnishes, Lacquers, and Color • NCCA Technical Manual, Table 8 Selected test methods for paint and painted surfaces Test Wet or liquid tests Dry film performance tests ASTM Federal method 141 • • • The efflux cup method The torsional method With the bubble viscometer, • • Colorimeters Spectrophotometers, Spectrophotometric . which flow coating is an efficient painting method Equipment for Flow Coating Part A • • Part B • • Both parts • Equipment for Roller Coating μ Equipment for Curtain Coating Examples. Direct-fired batch ovens Convection ovens for curing of paint coatings. (a) Direct fired. (b) Indirect fired Indirect-fired batch ovens Continuous ovens Convection continuous ovens, Indirect-fired. rinse. (9) Dryoff. (10) Curing oven. (11) Deionized quench for cooling. (12) Offload area. (13) Source for direct current. (14) To anodes in paint bath. (15) To work on conveyor. (16) Particl e