1. What are the core requirements for packaging during long-distance transportation?
A: Packaging for long-distance transportation of cold-rolled coils is a systematic project, mainly revolving around three core objectives:
Rust Prevention: The surface of cold-rolled coils is extremely prone to oxidation and rust, making protection paramount. Core materials include vapor phase corrosion inhibitor (VCI) paper, which releases rust-preventing gases in a sealed space, forming a protective layer on the metal surface. Long-distance or export transportation often uses multi-layer packaging of "VCI paper + plastic film + desiccant" to isolate moisture. For precision surfaces, VCI vapor phase corrosion inhibitors combined with vacuum sealing can form triple oxidation protection.
Prevention of Physical Damage: This includes collisions, friction, and compression during transportation.
Installing steel or paper corner protectors on the inner and outer rings and edges of the steel coil prevents edge damage caused by compression or friction during lifting and transportation.
Using high-strength steel straps or binding straps for radial and circumferential binding ensures that each layer of packaging fits tightly during transportation and does not shift.
2. How to Select Transport Vehicles and Ensure Proper Loading and Securement?
A: Selecting suitable transport vehicles and ensuring proper loading and securing are crucial to preventing displacement and collisions en route. To ensure safety, the loading process must strictly adhere to relevant national standards.
Vehicle Selection:
Road Transport: Specialized steel coil transport vehicles must be used. These vehicles are typically equipped with fixed saddles. The upper part of the carriage should be fitted with a sliding rainproof tarpaulin, which can be easily pushed to one end during loading and unloading, and completely covers the carriage during transport for effective rain protection.
Rail Transport: Steel coil boxes or specialized transport frames are recommended. Specialized frames typically feature a V-groove design to securely hold the steel coils and prevent rolling. Recyclable pallets or trays can also be used to secure the steel coils before hoisting them as a whole, avoiding the risks associated with multiple handling operations.
3. How to effectively prevent moisture and rust?
A: Rust prevention is the "lifeline" of long-distance transportation of cold-rolled coils, requiring a two-pronged approach: source packaging and process management.
Source packaging is fundamental: A combination of "rust-preventive paper/film + sealing + desiccant" must be used.
Rust-preventive paper/film: Use high-quality vapor phase rust-preventive paper to wrap the steel coil, ensuring an overlap of ≥100mm between rust-preventive papers and ≥50mm with the core paper. The overlaps should face downwards to create a good seal.
Desiccant: Place sufficient desiccant inside the sealed packaging to absorb residual moisture.
Process management is crucial:
Temperature and humidity monitoring: For high-value or ocean-going shipments, it is recommended to place temperature and humidity sensors inside the transport container (such as a shipping container) to monitor environmental parameters in real time and provide timely warnings in case of anomalies.
Rain and water protection: Throughout the entire transportation process (including transshipment and storage in the yard), ensure that the packaging is not exposed to rain or water immersion. Indoor warehouses should be chosen whenever possible, or outdoor storage yards should be well-drained and covered.
4. What are the differences in protection priorities for different modes of transportation (road, rail, sea)?
A: The environments and challenges differ for each mode of transportation, and the protection priorities must be adjusted accordingly.
Transportation Mode | Core Challenges | Protection Priorities
Road Transportation | Severe jolting, emergency braking, rain splashes | Secure securing: Use specialized vehicles and saddles to ensure secure fastening.
Immediate rain protection: Equip with rainproof tarpaulins to prevent water splashing from the road surface.
Rail Transportation | Longitudinal impact during marshalling, long-term vibration | Specialized mounting frames: Use high-strength, recyclable V-shaped steel mounting frames or pallets for rapid and stable loading.
Containerized Transportation: Use rolled steel boxes for door-to-door containerized transportation, reducing the risk of transshipment during intermediate stages.
5. What industry standards and regulations must be followed?
A: Following relevant national standards and industry regulations is the legal basis for ensuring protective effectiveness and clarifying responsibilities.
General Packaging Standards:
GB/T 247-2008 "General Provisions for Packaging, Marking and Quality Certificates of Steel Plates and Strips": This is the most basic national standard, applicable to the packaging, marking, transportation, and storage of various types of steel plates and strips, including cold-rolled steel.
Specific Transportation Standards:
Road Transportation: Local standards can be referenced, such as DB42/T 1443-2018 "Specifications for Road Transportation Services of Bulk Industrial Products (Steel Coils)," which sets forth specific requirements for personnel, vehicles, and protective equipment.
Automotive Industry: For cold-rolled steel plates supplied to automobile manufacturers, T/CAMT 4-2020 "Technical Specifications for Logistics and Distribution Services of Automotive Steel Plate Materials" must be followed.