Automotive Parts Coating Line for Tier-1 Supplier
Summary
A fully automatic overhead-chain powder coating line for a Tier-1 automotive parts supplier in Vietnam that produces brackets and connectors for Japanese and Korean OEM assembly plants, delivering 14,000 pieces per day at a film-thickness pass rate of 99.2%. The line runs a 5-station spray pretreatment, electrostatic powder booth, 30 m bridge gas oven at 200 °C and forced cooling inside a 120 m envelope, at 5 seconds per piece. Workpieces are brackets up to 800 mm and 8 kg. Output and pass-rate figures as reported after commissioning in 2024.
Project Background
The client is a leading Tier-1 automotive parts supplier in Vietnam, producing brackets and connectors for Japanese and Korean OEM assembly plants. Their existing semi-automatic coating line could not meet new capacity targets or quality standards required by the OEMs.
The Challenge
The client set three hard requirements for the new line: daily output of at least 12,000 pieces; film thickness tolerance ±10 μm; full IATF 16949 system compliance for OEM audit. At the same time, the existing factory measured 130 m × 20 m, and the new line had to fit within these constraints.
MUSI's Solution
After a site survey and process analysis, MUSI's engineering team designed an overhead chain fully automatic powder coating line: automatic loading → 5-station pretreatment (degrease, rinse, phosphate, rinse, dry) → electrostatic powder spray → 200 °C bridge oven curing → forced air cooling → automatic unloading — all within a precise 120 m envelope.
Equipment Configuration
| Line type | Overhead chain auto powder coating line |
|---|---|
| Workpiece spec. | Auto brackets, length ≤800 mm, weight ≤8 kg |
| Chain speed | 1.8 m/min |
| Cycle time | 5 sec/piece |
| Daily capacity | 12,000-15,000 pieces (2 shifts) |
| Drying oven | Bridge gas oven, 200 °C, 30 m long |
| Environmental | Pretreatment wastewater + activated carbon for oven exhaust |
| Automation | Fully auto load/spray/unload, 2-3 operators |
Equipment used on this line
- Automatic spray coating lines — overhead chain, floor belt and robotic flexible lines
- Powder coating systems — electrostatic booths, vertical lines, quick colour change and powder recovery
- VOCs and environmental equipment — RTO, RCO, activated carbon, zeolite rotor and wastewater treatment
Implementation
The project ran 90 days from contract signing to production launch — 60 days of equipment manufacturing, 20 days of installation, 10 days of commissioning. MUSI deployed a 6-person project team on-site, working closely with the client's engineering team. 18 coordination meetings during construction resolved various site issues.
Results
After commissioning, the line achieved stable output of 14,000 pieces/day — 65% higher than the previous line. Film thickness pass rate jumped from 92% to 99.2%. The line passed the supplier audits of two Japanese automakers’ Vietnam plants in the same year. Annual orders grew 38% YoY, and the new line achieved payback in 14 months.
Client Feedback
"MUSI's professionalism exceeded our expectations. From precision in solution design to attention to detail during installation — they show all the marks of a mature equipment manufacturer. We've already ordered our second line."
— Project Manager, Client Side
Selection logic: why this configuration
An overhead-chain powder line was chosen over a floor-belt line because brackets and connectors hang well and the chain allows a 120 m route to fold inside the 130 m × 20 m hall. Powder was chosen over liquid paint because the OEM film specification is met in a single coat without VOC treatment, which also removed a permit step. A bridge oven was preferred to a straight-through oven so that heat stays in the tunnel and the 200 °C cure holds at 1.8 m/min.
Scope of supply and key components
| Item | Specification | Notes |
|---|---|---|
| Overhead chain conveyor | 120 m route, 1.8 m/min | Automatic loading and unloading stations |
| Spray pretreatment | 5 stages: degrease, rinse, phosphate, rinse, dry | Wastewater treatment included |
| Electrostatic powder booth | Automatic guns with manual touch-up | Cyclone recovery |
| Curing oven | Bridge gas oven, 30 m, 200 °C | Forced air cooling after the oven |
| Exhaust | Activated carbon on oven exhaust | |
| Controls | PLC line control, 2–3 operators per shift |
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 powder guns and powder feed | International tier-one powder spray gun brands |
| Oven and dryer gas burners | Riello RS series, Weishaupt monarch WM-G, Baltur TBG, Honeywell Maxon OVENPAK, Eclipse |
| 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 |
| Dust collector filter cartridges | Donaldson Ultra-Web, Parker BHA, Camfil, MANN+HUMMEL |
| Pretreatment pumps and chemistry | Grundfos CR, KSB Etanorm, Xylem; Henkel BONDERITE, Chemetall Gardobond, PPG Zircobond, Nippon Paint |
| Sensors and temperature controllers | SICK, Pepperl+Fuchs, OMRON E5CC, Honeywell UDC, Yokogawa UT, ifm, KEYENCE |
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
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 |
Results: before and after
Figures are those published on this page; measurement party, sample size, test date and method are not on record here and are left blank rather than estimated.
| Metric | Before | After | Change | Measured by | Single / average | Samples | Test date | Method / instrument |
|---|---|---|---|---|---|---|---|---|
| Daily output | about 8,500 pieces (previous line, from the +65% figure) | 14,000 pieces | +65% | |||||
| Film-thickness pass rate | 92% | 99.2% | +7.2 pts | |||||
| Payback | — | 14 months | — |
Applicability and limits
The 5-second cycle and ±10 μm tolerance apply to small steel brackets hung densely on the chain. Larger or heavier parts, parts needing two colours on one line, or plants without natural gas will need a different oven and conveyor arrangement; for those cases MUSI sizes the line again from the part drawings.
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.
Who installs powder coating lines in Vietnam?
This line was installed and commissioned on site in Vietnam by MUSI engineers. MUSI Technology is a coating line manufacturer in Changzhou, China; other MUSI projects in Vietnam include a truck parts coating line (also installed on site by MUSI engineers) and a telescopic spray booth for a structural steel fabricator. For a new powder coating line in Vietnam, MUSI quotes the line with on-site installation, commissioning and operator training; standard configurations ship in 30–60 days.
FAQ
How many operators does an automatic powder line like this need? Two to three operators per shift on this line: one at loading, one at unloading and one covering the booth and quality checks. Automatic loading and unloading removed the hanging labour that a semi-automatic line needs.
Can the line meet IATF 16949 audit requirements? The line itself is not certified; the client's quality system is. The line supports the audit with logged oven temperature, controlled chain speed and film-thickness sampling, which is what the two OEM audits checked.
Why 200 °C for the oven? Standard polyester and epoxy-polyester powders cure at 180–200 °C metal temperature. The oven is set so that 8 kg brackets reach that temperature for the full dwell at 1.8 m/min.
How long did the project take? Ninety days from contract to production: sixty days of manufacturing, twenty days of installation and ten days of commissioning with a six-person MUSI team on site.
What does the wastewater treatment cover? Rinse water and spent phosphate from the 5-stage pretreatment are collected and treated before discharge so the plant meets local discharge limits; the exact scheme depends on the site permit.
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.
Provided by Lin Cong, Technical Director, MUSI Technology · Published 2026-05-02 · Updated 2026-09-30 · Last technical review: 2026-09-30
QQuestions buyers ask before ordering
quotation · price · lead time · installation · warranty
What information do you need to prepare a quotation?
Send part drawings or photos, the largest part size and weight, the material, the required output per shift, the paint or powder type and number of colours, and the available floor space, ceiling height and power or gas supply. MUSI engineers reply within 24 hours; a recommended configuration and quotation follow once your part data is complete.
How much does this equipment cost?
Budget depends on part size, throughput and the level of automation. Indicative ex-works ranges are published in our complete coating line cost guide; a configured quotation is prepared from your part data. Published indicative ex-works ranges: a complete powder coating line is roughly USD 75,000–230,000 semi-automatic, USD 200,000–600,000 for a standard automatic line and USD 600,000–2,000,000 for a high-throughput automated plant.
What is the lead time?
Standard configurations ship in 30–60 days from contract signing and down payment; custom configurations take longer. The delivery date is fixed in the contract.
Do you install and train operators overseas?
Yes. MUSI engineers carry out on-site installation and commissioning and give 3–5 days of operator and maintenance training. MUSI has delivered 800+ coating lines to customers in 36 countries.
What warranty and after-sales support are included?
12 months full-machine warranty, 36 months on critical components and up to 60 months on structural parts. International customers get 24-hour phone response and 72-hour on-site arrival; spare parts ship from the Changzhou headquarters.
Can the environmental equipment be supplied with the line?
Yes. VOC treatment (RTO, RCO, activated carbon, zeolite rotor), dust collection and paint wastewater treatment are supplied with the coating line under one contract; MUSI has equipped 50+ coating facilities whose projects all passed local environmental compliance reviews.
Get a Similar Solution
If your industry and requirements match this case, contact MUSI to schedule a free consultation. We'll design an optimal solution based on your specific workpieces, capacity, and facility.