Insulated overhead door (insulated sectional door for cold storage docks, compatible with CO₂/ammonia refrigeration systems)
Positioning: Primary outdoor loading door for cold storage, featuring high strength, high sealing, and superior insulation to withstand wind and snow while minimizing cold loss.
I. Core Panel Parameters (Available in Standard and Cold Storage Thickened Versions)
1. Standard Insulated Version (40mm)
Double-layer 0.4–0.5mm galvalume steel sheets with high-density polyurethane foam (42–48kg/m³) closed-cell injection, closed-cell rate ≥90%, thermal conductivity ≤0.022W/(m·K), thermal break design to prevent cold bridging, eliminating heat transfer and condensation on steel surfaces, U-value ≈1.0W/(㎡·K).
2. Cold Storage Thickened Version (50/67mm)
Thermal break insulated panels with U-value as low as 0.45–0.55W/(㎡·K), no frost at -35°C deep cold, compatible with R717 ammonia and R744 CO₂ low-temperature cold storage.
- Optional: Personnel door within the door, PC daylight observation window; anti-pinch embossed panel design.
II. Three Lifting Installation Types (Select Based on Building Height)
1. Standard Lift (80% of market applications)
Header space of 450–550mm required; after opening, panels lie horizontally under the ceiling. First choice for standard cold storage docks.
2. High Lift
Header space above 1.2m; panels are lifted high and then stored horizontally. Preferred when pipes or cable trays are routed above the opening.
3. Vertical Lift
Panels travel vertically along the wall. Suitable for buildings with height above 6m and extra-tall openings.
III. Sealing + Cold Storage Anti-Freeze Configuration (Key for Cold Retention)
- Full-perimeter EPDM seals: top seal + double side seals + bottom airbag seal, air leakage ≤1.5m³/(m·h) at 50Pa pressure differential, preventing hot/cold air convection.
- Sub-zero cold storage upgrade: freeze-protection heat tracing on frames and tracks to prevent rollers and gaskets from freezing at low temperatures; thermal break insulated frame cladding to reduce cold loss through the frame.
IV. Drive and Safety Configuration
1. Power: 380V industrial motor + heavy-duty galvanized torsion spring balance (service life 80,000–100,000 cycles), balancing 90% of door weight; manual operation possible during power outage; low-temperature servo motor optional for cold storage.
2. Standard Safety: Four-fold protection including bottom obstruction airbag reversal, infrared light curtain, cable break locking, and spring break anti-fall device.
3. Opening Options: Remote control, wall-mounted button, magnetic loop detector, interlocking with dock leveler, interlocking with air curtain (standard for cold storage).
- Operating speed: 0.25–0.35m/s, 10–15s per open/close cycle, recommended daily cycles ≤400 (for high-frequency interior doors, use insulated high-speed doors).
V. Application Scenarios (Standard Solution for Drive-Through Rack Cold Storage)
- Outdoor dock: Insulated overhead door (wind and rain resistant, anti-theft, long-term cold retention)
- Interior passage/forklift frequent aisles: Zipper insulated high-speed door (instant opening, reduces cold loss during opening)
> Truck dock package: Insulated overhead door + mechanical dock seal + dock leveler integrated system, fully sealed loading, saving 30%+ energy for cold storage units.
VI. Reference Pricing (2026 Market Prices)
- Standard 4m×4m (40mm panels): RMB 17,500–26,000/set
- Cold storage anti-freeze 4m×4m (50mm + heat tracing + full sealing): RMB 28,500–41,000/set
- Add personnel door, magnetic loop, dock seal: +RMB 3,000–7,000
VII. Selection Comparison
