PRETREATMENT PLANT

PRETREATMENT PLANT

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. •  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.

DIP Pretreatment Plant:

Dip Pretreatment Plant is also known as 7 tanks or 11 tanks process plant. In this components are loaded in basket and the basket is dipped in various chemical tanks as per chemical process. For basket handling from one tank to another tank we can use hoist (manual) or automated transporter system. After pretreatment process is done same basket can be inserted inside inline water drying oven or we can unload components from basket and load them on conveyor, which will go inside of Conveyorised water drying oven for drying off the water from components before powder sprayed on components.Air agitation is provided for proper mixing of chemical in tank. Dip pretreatment plant takes less space to install than spray pretreatment plant.

FEATURES AND BENEFITS:

•  Dip pretreatment plant is suitable for flat surfaces and hollow surfaces.
•  Air agitation is provided for proper mixing of chemicals in tank
•  Dippretreatment plant takes less space to install than spray pretreatmentplant

Automatic Pretreatment Plant

For loading and unloading of articles into various tanks in pretreatment process transporter system is mainly used with a programmed cycle. The cycle is based on the time required in particular tank as specified and also sequenced in such way that critical tanks (degrease, derust, Zn phosphate and WDO) are treated on priority, so articles are have been removed from this tanks with minimal time loss.

FEATURES AND BENEFITS:

•  Precise Control with the help of PLC programming
•  Robust system
•  Flexible PLC Programmed
•  Reduction in labour cost.
•  Effective control of production

CAPACITY:

•  As per customer requirement.
•  Dependig upon job/components.
•  Geometrical sizes & weights & No. of stations
•  Automatic timing & sequential programmed cycle.

APPLICATION:

•  Pretreatment plants.
•  Electroplating plants.
•  Anodising plants.