Pretreatment Plant in Nepal
SEW Surface Coating Pvt. Ltd. designs, manufactures and installs dip and spray pretreatment plants for manufacturers in Nepal. Every plant is built at our own works in Pune, India, then export-packed and shipped to Nepal, with erection and commissioning support from our engineers.
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
- Exported to Nepal
Pretreatment Plants for Nepal's Industry
Nepal's industry is concentrated in the Birgunj–Parsa–Bara corridor, Biratnagar, Hetauda, Bhairahawa, Butwal and the Kathmandu valley. Steel, roofing, furniture, electrical and agro-processing equipment makers are growing.
In Nepal, demand for pretreatment plants comes mainly from steel structure fabricators, furniture and storage makers and electrical and panel makers. 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.
Hydropower and infrastructure projects add demand for coated steel structures and electrical equipment.
Types of Pretreatment Plants We Supply in Nepal
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 Nepal That Use Our Pretreatment Plants
Steel & Roofing
Steel and roofing makers supply construction.
Typical requirement: Large dip tanks with transporter for long structural members.
Steel Furniture
Furniture makers serve offices and institutions.
Typical requirement: Conveyorised spray pretreatment matched to continuous sheet-metal production.
Electrical & Hydropower
Electrical makers supply hydropower and buildings.
Typical requirement: Spray or dip zinc phosphate line feeding a powder coating booth.
Agro-Processing Equipment
Equipment makers serve agro-processing.
Typical requirement: Dip pretreatment with a de-rusting stage for heavy fabricated parts.
Fabrication
Fabricators supply industry.
Typical requirement: Dip pretreatment with a transporter system for heavy and mixed-size fabrications.
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 Nepal
Plants for Nepal are fabricated and pre-assembled at our factory in Ranje, Pune, India. They are dispatched by road to the India–Nepal border at Raxaul–Birgunj and on to your site, where our engineers can supervise erection and commissioning.
- Technical study from your drawings, component details and production data
- Plant layout and process design in minimum floor space
- Fabrication and inspection at our Pune works
- Export packing and shipping documentation
- Erection and commissioning supervision by our engineers
Why Buyers in Nepal 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.
Export experience
We handle export packing and documentation and support erection and commissioning for customers in Nepal.
Industrial Areas We Serve in Nepal
Pretreatment Plant in Nepal – Frequently Asked Questions
Do you export pretreatment plants to Nepal?
Yes. SEW Surface Coating Pvt. Ltd. manufactures pretreatment plants at its factory in Pune, India, and exports them to customers in Nepal, with erection and commissioning support from our engineers.
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 to Nepal?
The plant is fabricated at our Pune works and dispatched by road via the Raxaul–Birgunj border crossing to your site. Our engineers can supervise erection and commissioning.
How do I get a quotation for a pretreatment plant in Nepal?
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 Nepal
Pretreatment Plants in Other Countries
- Pretreatment Plant in Bangladesh
- Pretreatment Plant in Sri Lanka
- Pretreatment Plant in Oman
- Pretreatment Plant in Vietnam
- Pretreatment Plant in UAE
- Pretreatment Plant in Malaysia
- Pretreatment Plant in Qatar
- Pretreatment Plant in Bahrain
Pretreatment Plants – main product page | All locations we serve
Need a Pretreatment Plant in Nepal?
Share your component size and weight, base metal, production rate and coating type. Our engineers will send a plant layout and technical offer for Nepal.
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