Product Name: Industrial Sectional Overhead Door

 Industrial Sectional Overhead Door (Industrial Lifting Door | Standard for Cold Storage / Through-Rack Warehouse Docks)

Compliant with national standard JG/T353-2012, featuring rigid polyurethane insulated panels, focusing on anti-theft, wind resistance, superior insulation, and durability for outdoor loading docks. Commonly used for cold storage docks, through-rack warehouse exterior doors, and paired with dock levelers.

 I. Basic Structure & Core Parameters

1. Panels: 40/50mm double-layer color steel + high-density polyurethane foam (42kg/m³), thermal break insulation, K-value ≤1.2W/(㎡·K), cold storage version K≤0.5; optional small daylight windows, pedestrian access door.

2. Opening/Closing Speed: 0.25–0.4m/s (standard), slower than high-speed doors, but far superior insulation and sealing compared to PVC high-speed doors.

3. Wind Load Resistance: withstands winds of Beaufort scale 8–12, ideal for outdoor open docks, waterproof and rainproof.

4. Max Opening: width 8m × height 8m, accommodating large-tonnage trucks.

5. Sealing: EPDM rubber seals around perimeter + bottom door seal; cold storage can be equipped with dock seals to reduce air infiltration.

 II. Three Lifting Installation Methods (Selected Based on Building Headroom)

1. Standard Lift (Common)

350–550mm space above header, panels lift and curve horizontally under ceiling; suitable for most ambient warehouses and -18°C freezer docks.

2. High Lift

>1.2m above header, panels stored horizontally at high level; preferred when pipes or cable trays are at ceiling.

3. Vertical Lift

Extra-high header, no ceiling space; panels rise vertically along wall; for buildings with >6m height, heavy-duty storage areas.

 III. Drive and Smart Configuration

- Power: 380V industrial lifting motor + torsion spring balance system (counterbalances panel weight, manual operation during power outage), spring life ≥100,000 cycles.

- Standard Controls: push-button station + remote; optional: loop detectors, radar, interlock with dock leveler, access control interlocking.

- Standard Safety: bottom safety edge, infrared light curtain, anti-drop cables, broken spring protection, auto-reverse on obstacle detection.

 IV. Cold Storage Upgraded Version (for Ammonia / CO₂ Refrigerant Low-Temperature Warehouses)

1. Thicker 50mm high-density PU panels, frost-proof seals, heat tracing on tracks, no icing or sticking at -30°C;

2. Fully insulated frame structure, with mechanical dock seals, tight sealing after truck docking, significantly reducing cold storage unit energy consumption (standard for R717 ammonia, CO₂ cold storage exterior doors).

 V. Sectional Door vs. High-Speed PVC Insulated Door (How to Choose for Cold Storage)

 VI. Market Pricing (2026 Reference)

- Standard ambient 4m×4m: RMB 18,000–28,000/set

- Cold storage insulated anti-freeze 4m×4m: RMB 29,000–42,000/set (including heat tracing, thickened seals)

- Adding pedestrian door, loop detector: additional RMB 3,000–6,000

 VII. Suitable Applications

Preferred: cold chain cold storage outdoor loading docks, through-rack dense storage exterior doors, large factory truck entrances, food processing plant perimeter gates;

Not suitable: high-frequency forklift traffic aisles inside warehouses (use high-speed insulated doors instead).