The automotive interior leather wrapping production line is an automated manufacturing system that precisely adheres leather materials to the surface of automotive interior components, such as seats, steering wheels, and dashboards. Below is a detailed introduction to its core technological processes:

I. Pretreatment Stage

Substrate Preparation

• Clean and degrease interior substrates made of plastic, foam, or metal to ensure impurity-free surfaces.

• Enhance surface adhesion through flame treatment or plasma technology.

Leather Cutting

• Use laser cutters or die-cutting machines to precisely cut leather sheets according to CAD drawings, leaving a 2-5mm margin for edge wrapping.

• High-end production lines adopt 3D scanning + intelligent nesting systems to improve material utilization (up to 85%+).

II. Adhesive Application Process

Substrate Gluing

• Apply PU hot-melt adhesive evenly on the substrate bonding surface via roll coating, spraying, or robotic dispensing, with glue thickness controlled at 0.1-0.3mm.

• The gluing path is automatically generated by the CAM system based on the component's curved surface to ensure full coverage of edge areas.

Leather Activation

• Heat the backside of the leather (60-80°C) to enhance glue fluidity and penetration.

III. Wrapping & Forming

Robotic Handling

• Vacuum suction cup end-effectors precisely grip leather sheets, with position 偏差校正 (accuracy ±0.5mm) via vision positioning systems.

3D Surface Fitting

• Multi-axis robotic arms gradually press the leather onto the substrate, starting from the center point and stretching toward the edges.

• For complex surfaces (e.g., seat side wings), airbag-assisted pressing or hot-press molds ensure complete 贴合 in hard-to-reach areas.

Edge Wrapping

• Automatic folding mechanisms flip excess leather to the backside of the component, securing it via sewing or hot-melt adhesive.

• Precision edge-wrapping achieves narrow edges of ≤0.8mm.

IV. Post-treatment Stage

Curing & Cooling

• Accelerate glue curing via infrared heating or hot air circulation, with curing time controlled at 30-90 seconds.

• Water-cooling systems rapidly reduce temperature to stabilize dimensions.

Trimming & Quality Inspection

• Robotic rotary cutters trim excess edges with ≤±0.3mm precision.

• Vision inspection systems automatically detect defects such as wrinkles or bubbles (detection accuracy ≥0.2mm).

V. Typical Equipment Configuration

• Core Equipment: 6-axis industrial robots (payload 5-20kg), laser cutters, hot-melt glue machines, vacuum adsorption tables

• Auxiliary Systems: MES production management systems, 3D scanners, AOI vision inspection systems

• Production Metrics: Cycle time ≤45 seconds/piece, yield rate ≥98%

VI. Process Advantages

• Material Compatibility: Supports genuine leather, PU leather, microfiber leather, etc.

• Design Flexibility: Enables complex decorative effects like double stitching and diamond quilting.

• Environmental Friendliness: Uses water-based adhesives with VOC emissions compliant with GB 27630-2011.

• Cost Efficiency: Reduces labor costs by over 60% and boosts productivity by 3-5 times compared to manual wrapping.

VII. Application Scenarios

• Production of mid- to high-end passenger car seats, steering wheels, and door panels

• Customized interior production for new energy vehicles (e.g., Tesla Model 3's leather dashboard)

• Personalized wrapping services for automotive customization shops

VIII. Technological Trends

• Intelligence: AI algorithms optimize wrapping paths and adapt to different material properties.

• Flexibility: Modular workstations enable rapid model changeovers (<15 minutes).

• Green Initiatives: Solvent-free adhesives and leather scrap recycling systems.

Through these processes, modern production lines achieve 一站式 automated manufacturing from substrate to finished product, significantly enhancing the quality consistency and production efficiency of automotive interiors.