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Wastes Associated with Automotive Painting

Wastes Associated with Automotive Painting. Waste paint (old, leftover, dried etc.) Solvent (various types) All materials contaminated with paint including: Used paint booth arrestors (also called exhaust filters) Disposable rags. Wastes Associated with Automotive Painting.

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Wastes Associated with Automotive Painting

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  1. Wastes Associated with Automotive Painting • Waste paint (old, leftover, dried etc.) • Solvent (various types) • All materials contaminated with paint including: • Used paint booth arrestors (also called exhaust filters) • Disposable rags Collision Repair - Solvent and Paint-contaminated Waste 11-1 (a)

  2. Wastes Associated with Automotive Painting • Masking tape and paper • Floor sweepings • Disposable mixing cups and sticks • Disposable paint strainers Collision Repair - Solvent and Paint-contaminated Waste 11-1 (b)

  3. Minimize the Amount of Painting Waste • Use reusable mixing cups and sticks • Clean them in a mechanical gun wash system. • Use cloth rags that are cleaned by a laundry service and returned. • Improve transfer efficiency of coating operations. • Recycle solvent on-site with a solvent distillation unit. Collision Repair - Solvent and Paint-contaminated Waste 11-2 (a)

  4. Minimize the Amount of Painting Waste • Recycle solvent off-site - recycling service. • Prevent solvent evaporation - close lids. • Use a mechanical gun wash system to reduce solvent waste. • Keep records of the types and quantities of materials used to better estimate future jobs. • Use a material usage tracking form. Collision Repair - Solvent and Paint-contaminated Waste 11-1 (b)

  5. Minimize the Hazardous Nature of Paint-Related Waste • Use undercoats and topcoats that contain no heavy metals. • Arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver. • Use low-VOC paint and solvent products. • Use water-based coatings when practical. Collision Repair - Solvent and Paint-contaminated Waste 11-3

  6. Disposal of Paint-Related Wastes • Liquid paint and solvent waste • Managed as a hazardous waste. • Stored in sealed containers labeled “Hazardous Waste ”. • Disposal by a hazardous waste management company. Collision Repair - Solvent and Paint-contaminated Waste 11-4 (a)

  7. Disposal of Paint-Related Wastes • Dry paint-related wastes: paint booth arrestors, rags, floor sweepings, masking tape etc... • Potentially hazardous due to metals, solvents and must be laboratory tested. • If hazardous, must be managed same as liquid paint and solvent wastes • If nonhazardous may landfill with approval and permits. Collision Repair - Solvent and Paint-contaminated Waste 11-4 (b)

  8. Transfer Efficiency • Transfer Efficiency (TE) is the ratio of the mass of solids (in the paint) reaching the surface being coated, to the mass of solids sprayed. • Transfer Efficiency = (Mass of Coating [Solids] Sprayed - Mass of Coating [Solids] Applied). Collision Repair - Solvent and Paint-contaminated Waste 11-5 (a)

  9. Transfer Efficiency • High transfer efficiency means less paint is wasted in overspray. • Poor transfer efficiency causes excessive paint and solvent waste. Collision Repair - Solvent and Paint-contaminated Waste 11-5 (b)

  10. Factors Affecting Transfer Efficiency • Factors that cannot be controlled by the spray operator. • Size and shape of the parts sprayed. • Atmospheric conditions • Finish quality requirements. Collision Repair - Solvent and Paint-contaminated Waste 11-6 (a)

  11. Factors Affecting Transfer Efficiency • Factors that can be controlled by the spray operator: • Spray equipment type • Gun set up • Spray angle • Spray distance • Spray techniques • Spray equipment maintenance and practices Collision Repair - Solvent and Paint-contaminated Waste 11-6 (b)

  12. Improving Spray Technique • Operator spray technique is the most important element in achieving a good transfer efficiency. • Spray Angle • Gun perpendicular to the surface being sprayed • Use parallel strokes. • Never arc the gun • except when performing blending operations or panel spotting. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (a)

  13. Improving Spray Technique • Spray Pattern. • Uniform pattern • Coating must be atomized properly. • Spray Distance • Appropriate distance from the surface being sprayed. • 6 to 8 inches (as close as 4 in. with some gun/coating combinations) • Distance constant throughout the coating operation. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (b)

  14. Improving Spray Technique • Spray Overlap • 50 per cent overlap for each pass • Feathering the trigger at the beginning and end of each pass. • Note: Technique may be altered slightly when applying high metallic, high solids base coats and some three stage systems Collision Repair - Solvent and Paint-contaminated Waste 11-7 (c)

  15. Improving Spray Technique • General Spray Techniques • Have a “plan of attack” • Do a “dry run” to practice spraying strategy. • For small and medium sized panels - make each pass the full length of the panel. • Spray larger panels in the same way, walking the length of the panel. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (d)

  16. Improving Spray Technique • Keep blended areas as small as possible. • Spray the border edges of the substrate first (banding). • High Transfer Efficiency Spray Equipment • HVLP gun uses high-volume/low pressure • LPLV gun uses low pressure/low volume Collision Repair - Solvent and Paint-contaminated Waste 11-7 (e)

  17. Improving Spray Technique • Choose the Best Equipment You Can Afford ! • Equipment budget. • Coating types being sprayed. • Ask paint representative for assistance. • Choose spray equipment for highest transfer efficiency and proper atomization. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (f)

  18. Improving Spray Technique • Use the proper fluid tip/air cap combination and gun settings for the material being sprayed. • Remember >>> A paint gun is only as good as the operator using it !!!!! • Gun Set-up • Correct size of fluid tip-air cap combination. • Fluid tip size is determined by coating viscosity • Viscosity is measured by a Zahn cup measuring system. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (g)

  19. Improving Spray Technique • Choice of air cap depends of the fluid tip size • Ask spray gun manufacturers for recommendations • Set the air pressure at the lowest possible setting. • Never exceed the coating manufacturer's recommended air pressure settings. • Keep records of gun set ups used with each type of coating to reduce set up time and material wasted during set up. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (h)

  20. Improving Spray Technique • Spray Equipment Maintenance • Maintaining clean equipment clean in good working order ensures proper atomization and a full, consistent spray pattern. Collision Repair - Solvent and Paint-contaminated Waste 11-7 (i)

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