Case Study: Electrical Products Spray Coating Line, Bangladesh
Summary
An automatic spray coating line, about 7.8 tonnes of equipment, for a Dhaka manufacturer of switchgear, lighting fixtures, locks and electrical accessories with its own metal stamping, electroplating, plastic moulding and surface painting. The line gives film build and appearance that depend on equipment settings rather than on the operator, with an automatic spray booth and guns, conveyor, curing section and exhaust with overspray treatment, shipped from China in June 2026.
Project Background
The client, based in Dhaka, manufactures switchgear, lighting fixtures, locks and electrical accessories, with its own metal stamping, electroplating, plastic moulding and surface painting. MUSI supplied an automatic spray coating production line, shipped from China in June 2026.
The Challenge
Electrical products combine many small metal and plastic parts that all need the same colour and finish, in a hot and humid climate where coating quality is easily affected by moisture. Manual spraying makes that consistency hard to hold.
MUSI's Solution
MUSI supplied an automatic spray coating line so that film build and appearance depend on equipment settings rather than on the operator, with the parts carried through spraying and curing on one conveyor.
Equipment Scope
- Automatic spray booth and spray guns
- Conveyor system
- Curing section
- Exhaust and overspray treatment
Results
The line was shipped in June 2026, adding automated spraying to the client’s in-house surface finishing.
Selection logic: why this configuration
An automatic booth on a conveyor was chosen over upgrading the client's manual spraying because electrical products combine many small metal and plastic parts that must match in colour, and manual work in a hot, humid climate does not hold that consistency. The line was kept compact, at about 7.8 tonnes, to fit an existing finishing department.
Scope of supply and key components
| Item | Specification | Notes |
|---|---|---|
| Spray booth | Automatic booth and spray guns | |
| Conveyor | ||
| Curing section | ||
| Exhaust and overspray treatment |
Key components
Key components are available from international brands, configurable per customer specification, so that spare parts can be sourced locally over the life of the line. Brand names below are the usual options for this type of equipment; the brands actually fitted are fixed in the contract specification.
| Component | Brands available on request |
|---|---|
| Automatic liquid guns, pumps and 2K proportioners | Graco ProMix 2KS, Sames Airmix, WAGNER AirCoat, Nordson, Binks (Carlisle Fluid Technologies) |
| Automatic powder guns and powder feed | Gema OptiGun, Nordson Encore, WAGNER PEA-X1, Sames (formerly SAMES KREMLIN) |
| PLC and HMI | Siemens SIMATIC S7-1500, Mitsubishi Electric MELSEC iQ-R, Schneider Electric Modicon, OMRON NX, Rockwell Automation Allen-Bradley |
| Variable-frequency drives | ABB ACS580, Siemens SINAMICS G120, Danfoss VLT, Schneider Electric Altivar, Yaskawa, Mitsubishi Electric |
| Conveyor gear motors | SEW-EURODRIVE, NORD DRIVESYSTEMS, Bonfiglioli, Siemens, Sumitomo Drive Technologies |
| Booth ceiling and intake filter media | Freudenberg Viledon, AAF SureStop, Camfil, MANN+HUMMEL |
| Dust collector filter cartridges | Donaldson Ultra-Web, Parker BHA, Camfil, MANN+HUMMEL |
| Compressed air for powder feed and instruments | Atlas Copco GA, Ingersoll Rand RS, KAESER ASD, Sullair |
Not included in the scope of supply
- Civil works, foundations and pits
- Building services up to the battery limit: power supply, gas, compressed air, water and drainage
- Local permits, emission approvals and third-party inspections
- Paint or powder supply, unless stated in the contract
- Installation labour and site utilities at the Dhaka plant
Services included with every line: engineering design, manufacturing, shipping documentation, installation supervision, commissioning, operator training, warranty and spare parts.
Typical programme
The durations below are typical for equipment of this class and are given for planning; they are not the recorded schedule of this project. A complete line usually runs 90–180 days from contract to acceptance, a single unit 30–60 days.
| Stage | Typical duration | What happens |
|---|---|---|
| Site survey and workpiece review | 5–10 days | Remote review of drawings and photos, or an engineer visit |
| Layout and detail design | 15–30 days | Layout drawing, utilities list and specification sign-off |
| Manufacturing | 45–90 days | Booths, ovens, conveyor, pretreatment and controls built and pre-assembled at the works |
| Shipping | 20–45 days | Sea freight; equipment shipped in sections for on-site assembly |
| Installation | 15–40 days | MUSI supervision with the client's installation crew or MUSI crew |
| Commissioning, training and acceptance | 7–15 days | Trial runs on the client's parts, operator training, acceptance record |
Applicability and limits
The line is sized for small electrical parts on one conveyor; large panels or enclosures would need a bigger booth and oven. Shipment date is from the shipping records; production figures at the plant have not been published.
Results shown in this case study reflect the stated operating conditions and should not be interpreted as guaranteed performance under different feed, production, environmental, or site conditions.
After-sales and spare parts
Warranty on a MUSI coating line runs from acceptance: 12 months on the complete line excluding consumables, 36 months on critical components such as motors, drives and the PLC, and 60 months on structural parts such as steel structure, ducting and oven bodies. Failures within warranty, excluding misuse, are repaired free of charge.
Support starts remotely: the service line is staffed around the clock, a preliminary diagnosis with recommendations is given within 2 hours, and where a site visit is needed an engineer reaches any major city within 72 hours. A spare-parts inventory is held at the Changzhou headquarters with same-day shipping, and customers can keep a dedicated parts stock at MUSI for emergencies. Details are on the after-sales service page.
FAQ
How is colour kept consistent across metal and plastic parts? By automatic spraying with fixed gun settings and conveyor speed, so every part receives the same film regardless of the operator, and by curing both substrates within their temperature limits.
Does humidity affect coating quality? Yes; moisture in the booth air and on parts causes blushing and adhesion faults. Controlled booth air and a short interval from cleaning to spraying reduce it.
What was shipped? About 7.8 tonnes of equipment in June 2026: automatic booth and guns, conveyor, curing section and exhaust treatment.
Can the line coat both powder and liquid? The line is configured for the coating system the client specified; guns for the other system can be added if the booth and cure are compatible.
Where does the client use the line? In its in-house surface finishing for switchgear, lighting fixtures, locks and electrical accessories.
Next step: a configuration proposal for a similar line
If your parts, volumes or plant conditions are close to this project, MUSI can return a line configuration and layout proposal. To prepare it we need four things:
- Photos and dimensions of the workpieces, with weight and material
- Required output (pieces per hour or per day, and shifts)
- Number of colours and how often colour changes are needed
- Available floor space and ceiling height, with the utilities on site
Message us on WhatsApp with these details, or use the quotation form.
Published 2026-09-26 · Updated 2026-09-30 · Last technical review: 2026-09-30
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Provided by Lin Cong, Technical Director, MUSI Technology