Pretreatment Plant in Rajkot, Gujarat
SEW Surface Coating Pvt. Ltd. designs, manufactures and installs dip and spray pretreatment plants for manufacturers in Rajkot, Gujarat. Every plant is built at our own works in Pune, Maharashtra, then erected and commissioned at your site in Rajkot.
A pretreatment plant cleans and chemically prepares metal surfaces before powder coating, liquid painting or CED coating. We supply complete lines with process tanks, water drying ovens, transporter systems and bath-maintenance accessories, so one company is responsible for the whole job.
- Dip & Spray Pretreatment
- Manual / Semi-Auto / Automatic
- Erection & Commissioning
- Supplied across Rajkot
Pretreatment Plants for Rajkot's Manufacturing Industry
Rajkot is Saurashtra's engineering capital, known for diesel engines, pumps, auto parts, castings and machine tools. Thousands of small and medium units work out of Aji, Metoda, Shapar-Veraval and Lodhika GIDCs.
In Rajkot, demand for pretreatment plants comes mainly from pump and motor makers, automotive and component makers and engineering and fabrication units. Coating failures such as peeling, blistering and early rust almost always trace back to poor surface preparation. A pretreatment plant removes oil, grease, rust and scale, then applies a conversion coating, typically a phosphate layer, that gives the powder or paint something to grip. The result is better adhesion, longer corrosion life and fewer rejected parts.
Much of the region's output is exported, so manufacturers are investing in better pretreatment and coating to meet buyer standards. Rajkot is about 880 km from our Pune works by road.
Types of Pretreatment Plants We Supply in Rajkot
Dip Pretreatment Plant
Components are loaded in a basket or jig and dipped through a series of chemical and rinse tanks in sequence. Because every surface is immersed, the chemicals reach inside hollow sections and recesses.
- Articles are loaded in a basket or jig
- The basket or jig is lifted and dipped in each tank as per the required chemical process
- Lifting and dipping by hoist (manual) or transporter system (manual, semi-automatic or automatic)
Best for: Batch production, mixed component sizes, heavy fabrications and parts with hollow sections.
Spray Pretreatment Plant
A conveyor carries components through an enclosed tunnel where each zone sprays a different chemical or rinse. It runs continuously and links directly to the drying oven and coating booth.
- The conveyor carries the article inside the tunnel
- The tunnel has separate zones as per the required chemical process
- Spray density and pressure are controlled with pumps and valves
- Tanks with filters below each zone give better circulation
Best for: High-volume conveyorised lines feeding a powder coating or paint shop, such as auto and appliance parts.
Typical Pretreatment Process Sequence
A standard zinc phosphate line follows the sequence below. Stages are added or removed depending on the base metal, the condition of incoming parts and the coating specification.
- DegreasingRemoves oil, grease and machining fluids.
- Water RinseWashes off degreaser carry-over.
- De-rustingRemoves rust and mill scale from steel.
- Water RinseCleans the surface after de-rusting.
- Surface ActivationPrepares the surface for a fine, even phosphate layer.
- PhosphatingBuilds the zinc or iron phosphate conversion coating.
- Water RinseRemoves excess phosphate salts.
- PassivationSeals the phosphate layer for added corrosion resistance.
- DM Water RinseFinal rinse in demineralised water to avoid salt deposits.
- Water Drying OvenDries components before powder coating or painting.
For aluminium and galvanised components we design the chemical sequence to suit. Our spray lines can also run nano-technology pretreatment chemistry, which works at lower bath temperatures and produces less sludge than conventional phosphating.
Equipment Supplied With the Pretreatment Plant
Water Drying Oven
Dries parts completely after the final rinse, since moisture left on the surface spoils the finish.
Transporter System
PLC-controlled transporter that moves jobs through the tanks on a programmed cycle, giving priority to critical tanks.
Oil Skimmer
Continuously removes floating oil from the degreasing tank, so the chemical lasts longer and parts come out cleaner.
Sludge Separator
Separates phosphate sludge from the bath to keep the process stable and cut tank-cleaning downtime.
Air Agitator
Keeps the bath moving for even temperature and chemical concentration around every component.
Industries in Rajkot That Use Our Pretreatment Plants
Pumps, Engines & Motors
Rajkot is one of India's largest centres for submersible pumps, diesel engines and motors.
Typical requirement: Dip pretreatment with a de-rusting stage for castings and fabricated bodies.
Auto Parts
Auto part makers supply OEMs and the replacement market across India and abroad.
Typical requirement: Spray or dip zinc phosphate line for high corrosion resistance, ready for powder or CED coating.
Machine Tools & Engineering
Machine tool and engineering units process frames, beds and guards.
Typical requirement: Dip pretreatment with a transporter system for heavy and mixed-size fabrications.
Agricultural Equipment
Implement and farm-equipment makers serve Saurashtra and beyond.
Typical requirement: Dip pretreatment with a de-rusting stage for heavy fabricated parts.
Motor Windings
Pump and motor makers need varnishing of stator windings.
Typical requirement: Dip pretreatment for motor bodies, stampings and housings before painting.
Pretreatment Plant Specifications
| Plant types | Dip pretreatment (batch) and spray pretreatment (conveyorised tunnel) |
|---|---|
| Material handling | Manual hoist, transporter system (manual / semi-automatic / automatic) or overhead conveyor |
| Process stages | Typically 7 to 10 stages, designed to your base metal and coating specification |
| Chemistry | Iron phosphate, zinc phosphate or nano-technology pretreatment |
| Spray system | Zone-wise pumps, valves, nozzles and filtered tanks for controlled spray density and pressure |
| Bath heating | Heating system selected to suit process temperatures and the fuel available at your site |
| Drying | Water drying oven: in-line, batch type, conveyorised conventional or camel back |
| Controls | Manual operation, PLC-controlled transporter, SCADA monitoring on request |
| Bath maintenance | Oil skimmer, sludge separator and air agitator |
| Scope of supply | Design, manufacturing, erection and commissioning |
Final configuration is fixed after we study your component drawings, production rate and available floor space.
From Our Pune Works to Rajkot
Plants for Rajkot are fabricated and pre-assembled at our factory in Ranje, Pune, about 880 km away by road. Equipment is dispatched by road and erected at your site by our team, followed by commissioning and trial runs.
- Site visit and study of components, production rate and space
- Plant layout and process design in minimum floor space
- Fabrication and assembly at our Pune factory
- Dispatch, erection and commissioning at your site
- Trial runs and after-sales service support
Why Buyers in Rajkot Choose SEW Surface Coating
In-house manufacturing since 1996
Our own fabrication unit in Pune gives one-roof control over design, quality and delivery commitments.
25+ years in coating systems
More than two and a half decades of experience in powder and liquid painting systems for automobile, appliance, electrical, furniture and other industries.
Layouts in minimum space
We specialise in fitting a complete line into the floor space you actually have.
Low running cost
Plants are engineered for low fuel consumption, with options such as camel back ovens, solar-assisted heating and Waste Heat Recovery Systems (WHRS).
Modern technology
Nano-technology spray pretreatment, PLC-controlled transporters and SCADA monitoring are part of our installed base.
Erection to after-sales
We stay with the project from plant purchase through erection, commissioning and service support.
Industrial Areas We Serve in and Around Rajkot
Pretreatment Plant in Rajkot – Frequently Asked Questions
Do you supply pretreatment plants in Rajkot?
Yes. SEW Surface Coating Pvt. Ltd. manufactures pretreatment plants at its factory in Pune and supplies, erects and commissions them for customers across Rajkot, Gujarat.
What is the difference between dip and spray pretreatment?
In a dip plant, components in a basket or jig are immersed in each tank, which suits batch work, heavy parts and hollow sections. In a spray plant, a conveyor carries parts through a tunnel where each zone sprays chemical under controlled pressure, which suits continuous high-volume production.
How many stages does a pretreatment plant need?
Most zinc phosphate lines use 7 to 10 stages: degreasing, rinses, de-rusting, surface activation, phosphating, passivation and a DM water rinse, followed by a water drying oven. We finalise the number after studying your components, base metal and coating specification.
Can you supply the complete line with drying oven and powder coating booth?
Yes. We supply complete lines including pretreatment, water drying oven, powder coating booth or liquid painting booth, curing oven and conveyor or transporter, so one company is responsible for the whole plant.
Do you offer automatic pretreatment plants?
Yes. Dip plants can be supplied with a PLC-controlled transporter system in semi-automatic or automatic mode, and spray plants run on a continuous conveyor.
How is the plant delivered and installed in Rajkot?
The plant is fabricated at our Pune works, about 880 km from Rajkot by road. It is dispatched to your site, where our team erects and commissions it and carries out trial runs.
How do I get a quotation for a pretreatment plant in Rajkot?
Send your component size and weight, base metal, production rate and coating type through our enquiry page, or call +91-99758 35066. Our engineers will prepare a layout and technical offer.
Other Products We Supply in Rajkot
Pretreatment Plants in Other Locations
- Pretreatment Plant in Ahmedabad
- Pretreatment Plant in Surat
- Pretreatment Plant in Vadodara
- Pretreatment Plant in Vapi
- Pretreatment Plant in Nashik
- Pretreatment Plant in Thane
- Pretreatment Plant in Mumbai
- Pretreatment Plant in Pimpri-Chinchwad
Pretreatment Plants – main product page | All locations we serve
Need a Pretreatment Plant in Rajkot?
Share your component size and weight, base metal, production rate and coating type. Our engineers will send a plant layout and technical offer for Rajkot.
Send Your Requirement Contact Us