PRETREATMENT PLANT
Pretreatment means surface preparation. Before powder coating/ painting it is necessary to treat surface of component with chemical to get better quality of coating. For this purpose, pretreatment plants are installed before powder coating/ painting plant. This is also known as cleaning or washing process. There are various pretreatment processes such as seven tanks (7 tanks or Phosphating), 11 tanks, NANO process, Chromatizing etc. The pretreatment process is decided on component material, intensity of oil, grease and rust on component. Pretreatment plant can be designed as per coating requirement such as salt spray test, impact test, scratch test, bending test etc. There are two types of pretreatment plant as following:
SPRAY PRETREATMENT PLANT
Spray Pretreatment Plant is also known as Conveyorised pretreatment plant, as components are hung on conveyor and they go through various chemical zones as per chemical process where nozzles spray the chemical on the component surface for surface preparation. Same conveyor goes inside water drying oven, powder coating booth and powder curing oven, hence operator have to only load components before pretreatment and unload after powder coating.
FEATURES AND BENEFITS:
- Spray pretreatment plant is suitable for flat surfaces.
- The spray density & pressure is controlled with the help of pumps & valves.
- Tanks with filters are provided below the zones for better circulation system.
- Material handling is less in spray pretreatment plant.