Factory – Multistar Parts Co., Ltd.
Located in Zhengzhou, Henan Province – China’s premier commercial vehicle manufacturing and logistics center – our factory and warehouse facilities represent the foundation of our commitment to quality, reliability, and innovation.
How a Premium Refrigerated Truck Box Is Made
1. Panel Pretreatment & Metal Forming
🔩 Quality control starts from the raw material
High-precision leveling equipment ensures flatness of inner/outer metal sheets. CNC punching and fiber laser cutting achieve a machining accuracy of 0.1mm, laying the foundation for perfect lamination.
2. CNC Bending & “Sandwich” Pre-Assembly
📐 Shaping the structure
High-precision CNC bending centers form metal sheets into box panels. The inner sheet, outer sheet, and high-strength insulation material (polyurethane) are pre-assembled into the classic “sandwich” composite structure.
3. Core Process: Automated High-Pressure Foaming
🧪 Injecting the “thermal lock”
The heart of a reefer box. Closed-loop injection technology mixes polyurethane chemicals under high pressure and injects them into the cavity. Real-time sensors monitor temperature and pressure to ensure a fine, uniform foam cell structure, eliminating thermal bridges.
4. Constant-Temperature Curing & Pressure Holding
⏳ Zero-deformation guarantee
After foaming, each box undergoes constant-temperature curing on a holding platform. This critical step releases internal stress, ensuring dimensional stability and preventing long-term deformation.
5. Modular Assembly & Detailing
🔧 Finishing touches
Installation of door gaskets (for airtightness), side skirts, reinforcements, and refrigeration unit pre-installation brackets. All adjacent panels are bonded with high-strength structural adhesive and reinforced with rivets.
6. Airtightness & Performance Final Inspection
✅ Rigorous testing before delivery
Every box must pass a strict water leakage test (rain simulation) and lift test. Extreme environmental chamber testing ensures you receive a true “walk-in freezer on wheels.”
Truck Tail Lift Manufacturing & Assembly
Hydraulic & Electric Liftgates for Commercial Vehicles
Production Capacity: 1,000 units per year
Models Manufactured:
| Type | Capacity | Key Applications |
| Tuck-Away Lift | 500–1500 kg | Urban delivery, full rear access |
| Column Lift | 1000–3000 kg | Heavy-duty, pallet handling |
| Cantilever Lift | 500–2000 kg | Bulky goods, stable platform |
| Slider Lift | 500–1500 kg | Space-saving, under-chassis storage |
Key Manufacturing Processes:
Hydraulic cylinder assembly and testing
Thermal testing, water tightness, structural integrity
Platform welding (anti-slip surface)
Thermal testing, water tightness, structural integrity
Electrical system wiring and waterproofing
Thermal testing, water tightness, structural integrity
Load testing (120% of rated capacity)
Thermal testing, water tightness, structural integrity
Salt spray corrosion testing
Thermal testing, water tightness, structural integrity