Details
The automotive bumper paint line is a fully automated, modular coating system designed for high-precision surface finishing of plastic bumpers (PP, TPO, ABS, etc.) in mass production. It integrates intelligent conveying, multi-stage pretreatment, robotic electrostatic spraying, controlled curing, and exhaust purification to deliver consistent, high-quality, and eco-friendly coatings with high transfer efficiency and low VOC emissions.
Feature And Advantage
Honglichang is capable of delivering complete 2D and 3D engineering drawings for the entire bumper painting workshop, covering all relevant components. Our design fully takes into account critical operating parameters including maximum and minimum conveyor speed, temperature, humidity, air pressure, as well as air volume and airflow direction, to guarantee superior painting quality.
1. Superior Coating Quality: Ultra-fine atomization + electrostatic adsorption = smooth, glossy, uniform finish with minimal orange peel.
2. High Efficiency & Cost Savings: Transfer efficiency ≥80% (saves 30–55% paint); 24/7 automated operation; reduced labor and rework costs.
3. Strong Adhesion: Flame/plasma treatment ensures reliable bonding on low-surface-energy plastics (PP/TPO).
4. Eco-Friendly: Low VOC emissions; CO₂ cleaning (no chemicals); energy-efficient ovens.
5. Flexibility: Modular design adapts to different bumper sizes, colors, and production volumes (500–2,000 pieces/day).
Core Process
Pretreatment System
Adopts dry-wet combined pretreatment process to thoroughly remove mold release agent, grease, dust and static residue on the surface of plastic parts, and improve substrate surface activity.
- Degreasing Process: Water-based alkaline degreasing + pure water circulating rinsing; degreasing temperature 45±5℃, soaking time 3–5min; residual oil rate on workpiece surface ≤0.03%
- Drying Parameters: Hot air circulating drying oven, working temperature 60–85℃, temperature uniformity ±1.5℃; drying time 12–18min, no water residue on workpiece surface
- Surface Activation: Dual optional process of flame treatment / plasma treatment; flame treatment temperature 1200–1500℃, treatment distance 50–100mm; plasma power 3–5kW, surface tension of treated plastic ≥42mN/m, permanent adhesion improvement
- Dust Removal System: High-pressure ion electrostatic dust removal + air shower cleaning; electrostatic voltage 8–12kV, dust removal efficiency ≥99.5%, effectively eliminate static adsorption dust
Clean Spraying Room System
Adopts full enclosed negative pressure clean spraying room to ensure stable spraying environment and zero cross-contamination of paint mist.
- Environment Control: Constant temperature 23±2℃, constant humidity 60±5%RH; indoor cleanliness reaches ISO 8 class
- Air Supply & Exhaust: Top air supply and bottom exhaust, air circulation volume 8000–12000m³/h, negative pressure value -15~-25Pa, no paint mist overflow
- Filter System: Primary efficiency + medium efficiency + high efficiency three-stage filtration; filtration efficiency ≥99.97% for 0.3μm particles
- Leveling Zone Parameters: Independent constant temperature leveling zone, single leveling time 6–12min, no dust falling during film forming
Robotic Electrostatic Spraying System
Equipped with 6-axis high-precision spraying robot and high-speed electrostatic rotary atomizer (static spray cup), which is the core equipment to realize high film uniformity and high paint transfer efficiency.
- Spraying Robot: Repeat positioning accuracy ±0.02mm, maximum arm span 2500mm, support offline programming and 3D trajectory simulation, adapt to complex curved surface of bumpers
- Electrostatic Rotary Atomizer: No-load speed 30000–70000rpm (adjustable), high-voltage static 60–100kV micro-current stable output, voltage fluctuation ≤3%
- Coating Parameters: Paint flow rate 100–500mL/min, molding air pressure 0.3–0.5MPa, driving air pressure 0.2–0.4MPa; atomized particle size 10–20μm, ultra-fine and uniform atomization
- Film Thickness Standard: Primer 18–25μm, base coat 22–35μm, clear coat 35–50μm; overall film thickness tolerance ±3μm
- Transfer Efficiency: Electrostatic adsorption efficiency ≥85%, far higher than 40–50% of traditional air guns
Curing Oven System
Adopts hot air circulating closed curing oven with gradient temperature control to avoid paint film bubbling, wrinkling and cracking.
- Heating Method: Gas/electric/diesel multi-mode optional heating, full hot air circulation structure
- Temperature Parameters: Primer curing 85±5℃ (15–20min), base coat low-temperature leveling curing 75±5℃ (10–15min), clear coat high-temperature curing 110±10℃ (20–30min)
- Temperature Uniformity: Internal oven temperature deviation ≤±2℃, heating uniformity ≥98%
- Energy Saving Performance: Thermal insulation layer thickness 80–100mm, heat loss rate ≤8%, energy saving 30% compared with traditional ovens
Conveying System
- Equipment Type: Precision skid chain conveyor + servo tracking system
- Operating Parameters: Running speed 5–18m/min (stepless adjustable), single skid load 0–100kg, conveying positioning accuracy ±0.5mm
- Working Performance: 24-hour continuous operation, equipment failure rate ≤1.2% annually
Specifications
| Equipment | Key Parameters |
|---|---|
| Skid Conveyor | Speed: 5–15 m/min; load capacity: 50–100 kg/skid; precision: ±0.5 mm |
| CO₂ Snow Jet | Pressure: 0.5–0.8 MPa; snow particle size: 20–50 μm |
| Flame Treatment | Temperature: 1,200–1,500°C; burner distance: 50–100 mm |
| Spray Robot | 6-axis; repeatability: ±0.02 mm; reach: 1,800–2,500 mm |
| Electrostatic Rotary Atomizer | Speed: 30k–70k rpm; voltage: 60–100 kV; flow rate: 100–500 mL/min |
| Curing Oven | Temp range: 50–150°C; uniformity: ±2°C; energy efficiency: ≥85% |
Application Areas
Automotive: Front/rear bumpers, bumper grilles, side skirts, and other exterior plastic parts.
Materials: PP, TPO, ABS, PC/ABS, and blended plastics.
Honglichang Serve
Professional one-stop engineering service including project consultation, factory layout design, process scheme optimization, equipment production, clean room construction, on-site installation, overall commissioning, worker technical training and long-term after-sales support. We ensure every delivered paint shop achieves stable high-yield and high-quality production to maximize customers' investment return.
Certificate
- National High-Tech Enterprise: Leaders in innovative automotive coating systems.
- ISO 9001 Quality Management: Consistent, top-quality PP ABS spray painting.
- ISO 14001 Environmental Management: Eco-friendly car parts paint shop solutions.
- ISO 45001 Occupational Health: Safe operations for every automotive coating line.
- Three National Invention Patents: Cutting-edge PP ABS spray painting tech.
- Seven Software Copyrights: Smart automation for precise automotive polymer coating.
- 57 Utility Model Patents: Practical innovations for car coating efficiency.
- General Contracting Qualifications: Expertise in mechanical and environmental engineering.
FAQ
Q: How do you guarantee our quality standards?
A: We layer in quality: offline robot programming optimizes spray paths first, SCADA logs every parameter (full traceability), and we can add automated vision checks for 100% surface inspection. One client matched their OEM's strict standards on the first try.
Q: How fast can you set up a car parts paint shop?
A: 3-6 months with modular parts.
Q: Does it work for EV production lines?
A: Yep, it's perfect for EV parts like BYD's, with eco-friendly coating.
Q: How much maintenance is needed?
A: Daily wipe-downs, quarterly checks. Downtime's under 2% with our support.
Q: Can it fit in a small factory?
A: Absolutely. We design compact layouts-even multi-level (mezzanine) setups to save floor space. Our 3D simulation lets you see the layout first, so we maximize output per square meter. A Guangzhou client with a tight space now runs 2 lines where they used to fit 1.
Q: Is this a fully unmanned, "lights-out" factory system?
A: While highly automated for minimal supervision, the system is engineered for operational excellence with strategic human oversight. Tasks like fixture loading, final quality audit, and system monitoring are essential for ensuring ultimate reliability and quality, creating a perfect synergy between automation and human skill.
Power up your production with a smart painting line that works. Reach out to Honglichang for a custom solution and a free consultation. Let's talk!
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