1.What are the core packaging measures?
Use highly effective rust-proof materials:
Rust-proof oil/rust-proof paper: Apply specialized vapor-phase rust-proof paper or rust-proof oil to the inner and outer rings and end surfaces of the coil to create a protective layer that inhibits moisture from contacting the zinc layer.
Rust inhibitor: Place an appropriate amount of vapor-phase rust inhibitor inside the packaging. Its volatile substances absorb onto the metal surface within a confined space, preventing rust.
Precision inner packaging:
Waterproof plastic inner film: Tightly wrap the galvanized coil with a thick, waterproof PE (polyethylene) or PVC plastic film. This film should be large enough to completely enclose the coil and effectively sealed at the ends and seams (usually heat-sealed or securely taped) to ensure airtightness. This is the key to preventing moisture intrusion.
Sturdy outer packaging:
High-strength protective cover: Cover the upper and lower ends of the coil with a high-strength composite protective cover over the plastic inner film to prevent the inner film from being cut or abraded during lifting and transportation.
Radial reinforcement: Multiple steel belts or high-strength plastic strapping tapes are used to strap and reinforce the steel coil along its circumference, which can not only fix the inner packaging but also prevent it from loosening during transportation.
2.How to choose the right means of transportation?
Container Transport (Preferred):
Dry Cargo Containers: Ensure the container itself is structurally sound, free of holes and rust, and that the door seals are intact.
Ventilated Containers: In humid weather or during sea transport, consider using ventilated containers to facilitate air exchange and prevent "container rain" from forming inside the container.
Flatbed/Skeleton Transport:
A waterproof tarpaulin must be used that matches the cargo size and is in good condition. Ensure the tarpaulin completely covers the cargo and is securely tied to prevent it from blowing open or accumulating water during transit.
3.How to avoid contact with condensation?
Isolate cargo from the vehicle/container: Do not place cold steel coils directly on warm, humid ground or against the container walls. Use dry wood planks, rubber mats, or other cushioning to separate the steel coils from the transport vehicle floor to ensure adequate air circulation.
Control temperature fluctuations: During container transportation, significant temperature fluctuations are a major cause of condensation. If conditions permit, place a desiccant (such as a container-specific desiccant) inside the container to absorb moisture from the air.
4.What are the precautions for different modes of transportation?
Ocean transportation: The highest risk. Salt spray, high humidity, wave splashes, and constant diurnal temperature swings all pose significant challenges. The most stringent packaging combination (waterproof inner film + protective cover + outer tarpaulin) must be used, along with containerized shipping and the generous use of desiccant.
Land transportation: Pay close attention to weather changes. Check the weather forecast before loading and avoid transport during rainy or snowy conditions. When stopping for rest, be sure to check the tarpaulin for integrity.
Rail transportation: Similarly, precautions must be taken to protect against rain and moisture, ensuring the tarpaulin is securely covered.
5.What should you
Packaging Verification: Is the inner layer of the product sealed with waterproof plastic film? Is anti-rust oil/paper applied? Are the end caps properly installed? Are the strapping tapes securely fastened?
Loading Verification: Is the transport vehicle (container/carriage) dry, clean, and undamaged? Are the steel coils isolated from the floor with dry padding?
Covering Verification: If an open truck is used, is the tarpaulin fully covered, securely tied, and free of water accumulation and dents?
Environmental Verification: Is contaminants avoided? Is loading conducted in rainy or snowy conditions?
Document Verification: Is the "wet-sensitive" warning noted on the waybill to alert the carrier?
pay attention to during transportation?