Case Study: Seat Recliner & Slide Rail Coating Line, Jiangsu
Summary
A high-volume small-parts coating line for an automotive seating components supplier in Liyang, Jiangsu, coating seat recliners, slide rails and fine-blanked parts supplied in volume to seat manufacturers. The line is sized for throughput rather than part size: dense hanging on the conveyor, pretreatment matched to stamped steel, spray stations set for a thin, even film that does not build up on tight-tolerance surfaces, and a curing profile matched to light-gauge parts. The line runs as part of the client's regular seat-component production in 2026.
Project Background
The client, based in Liyang, Jiangsu, makes seat recliners, seat slide rails and fine-blanked parts for automotive seating systems, supplied in high volumes to seat manufacturers.
The Challenge
Recliners and slide rails are small, precise stamped and fine-blanked steel parts produced in very large batches. The coating has to keep pace with that output while giving every part the same corrosion protection, and it must not build up on functional surfaces where tolerances are tight.
MUSI's Solution
MUSI sized the line for small-parts throughput rather than part size: dense hanging on the conveyor, pretreatment matched to stamped steel, and spray stations set up for consistent, thin, even film on small geometry. The curing profile was matched to the light gauge of the parts.
Equipment Scope
- Pretreatment line for stamped steel parts
- Conveyor with high-density hangers
- Spray booth for small parts with overspray recovery
- Curing oven
Results
The line runs as part of the client’s regular seat-component production, giving an in-house coating step for recliners and slide rails at the volumes the seat business needs.
Selection logic: why this configuration
Dense hanging with a thin-film spray set-up was chosen over a standard hardware line because recliners and rails have functional surfaces where film build changes the fit; the spray stations were set for consistent low film rather than maximum coverage. The cure profile was shortened for light-gauge stamped parts so the line runs faster than a general-purpose oven would allow.
Scope of supply and key components
| Item | Specification | Notes |
|---|---|---|
| Pretreatment | For stamped steel parts | |
| Conveyor | High-density hangers | |
| Spray booth | Small-parts booth with overspray recovery | Thin, even film on tight-tolerance parts |
| Curing oven | Profile matched to light-gauge parts |
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 | Gema OptiGun, Nordson Encore, WAGNER PEA-X1, Sames (formerly SAMES KREMLIN) |
| 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 |
| Pretreatment pumps and chemistry | Grundfos CR, KSB Etanorm, Xylem; Henkel BONDERITE, Chemetall Gardobond, PPG Zircobond, Nippon Paint |
| Dust collector filter cartridges | Donaldson Ultra-Web, Parker BHA, Camfil, MANN+HUMMEL |
| 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 |
Applicability and limits
The approach applies to small stamped steel parts coated in very large batches where film must stay thin on functional faces. Parts needing heavy corrosion film build, or mixed part sizes on one line, are sized differently.
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 coating kept off functional surfaces on recliners and rails? By setting the spray stations for a thin, even film and by hanging parts so tolerance faces are shielded; masking is added only where the drawing requires it.
What throughput does a small-parts line reach? It depends on hanging density and cure time; this line is sized to the client's seat-component volumes with dense hangers and a short cure for light-gauge parts.
What pretreatment suits stamped steel? Degrease and rinse to remove stamping oil, then a conversion coating sized for thin steel, before the parts go straight to the booth on the same conveyor.
Why match the cure profile to the part gauge? Light-gauge parts reach cure temperature quickly; a shorter profile keeps the film properties and raises line speed.
Is the line in production? Yes, it provides the in-house coating step for recliners and slide rails at the volumes the seat business needs.
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