1.How to choose a transportation method based on transportation mode and risk points?
Ocean Freight (Container/Bulk Carrier):
Risks: High humidity, salt spray, continuous vibration, significant swaying.
Materials: Moisture-proof is essential! Polyethylene/polyurethane foam, rubber, or moisture-proof composite materials are preferred. Use vapor phase rust inhibitor paper/film to wrap steel coils. Place desiccants inside containers.
Road/Rail Transport:
Risks: Impact from frequent starts and stops, road bumps, and friction from strapping.
Materials: Cushioning and friction prevention are key. High-strength corrugated cardboard combined with high-density foam is the mainstream choice. Use specialized saddle-shaped foam pads to distribute pressure on the truck bed floor. Rolls must be separated by thick cardboard or foam.
Multimodal Transport:
Risks: All of the above, and involves multiple lifting and transshipment.
Materials: Use the highest level of protection composite solutions and ensure packaging remains stable after multiple handling operations.
2.How to choose the transportation method based on the characteristics of cold-rolled coils?
Roll Weight and Size: Heavier and larger rolls require higher compressive strength and thickness of the shock-absorbing pads. Simple pressure calculations (roll weight/contact area) are necessary to ensure the padding material does not crush.
Surface Requirements:
Ordinary Surfaces: High-strength cardboard + foam padding is sufficient.
High-gloss, Coated, and Stainless Steel Surfaces: Non-polluting, non-shedding materials must be used, such as industrial felt, specialized chlorine-free foam, or laminated cardboard, to prevent marks or corrosion.
Core Condition: Hollow cores are very fragile. Core protection plugs are essential; high-resilience cylindrical foam or custom-made paper cores should be used, inserted into both ends of the core and protruding a certain length to prevent direct contact and impact from lifting equipment.
3.What does a complete cold-rolled coil transport packaging protection system include?
Bottom Load-Bearing and Cushioning Layer:
Inside a flatbed truck or container: Place a heavy-duty wooden frame or specialized steel support in a grid pattern, then place a custom-made high-density polyurethane "saddle pad" on top of the support. The curvature of the saddle pad should match the bottom of the steel coil, changing line contact to surface contact and greatly dispersing pressure.
Simplified Solution: Use multiple layers of thickened high-strength honeycomb cardboard or rubber pads as the bottom layer.
Coil Body Protection Layer:
The entire steel coil is wrapped with vapor phase corrosion inhibitor (VCI) paper for rust prevention.
The outer layer is secured with high-strength tensile film or fiber-reinforced strapping to prevent loosening.
For coils with extremely high requirements, a layer of soft felt can be added inside the rust-inhibiting paper.
Side and Edge Protection:
Use round or polygonal corner protectors (made of corrugated cardboard or foam) to protect the exposed sides and edges of the steel coil. This is crucial to prevent edge deformation (commonly known as "coil collapse") caused by impacts.
Insert core protective plugs at both ends of the core.
Separation between rolls:
If multiple rolls are stacked or placed side by side, they must be completely separated from each other with rigid corrugated cardboard or foam board with a thickness of ≥10mm to prevent relative sliding and friction.
4.What are the selection steps?
Assess risks: Determine the main mode of transport, distance, and maximum potential impact.
Define requirements: Confirm the surface grade, weight, and specific rust prevention requirements for the steel coils.
Calculate costs: Balance the initial packaging cost with the cost of potential cargo damage.
Test and validate: Conduct simulated transport tests (e.g., vibration and drop tests) on the new solution.
5.What are the important points to note?
Never allow wooden boards to come into direct contact with the steel coil surface, as impurities, moisture, and hardness in wood can cause contamination, rust, and indentation.
Avoid using low-density, easily crumbled foams (such as polystyrene EPS), as they will completely fail under pressure.
Ensure all packaging materials are neutral, chlorine-free, and sulfur-free to prevent chemical corrosion.
Strapping is crucial: Regardless of the quality of the padding material, the steel coil must be securely fastened to the transport vehicle using professional strapping (steel or polymer strapping) to prevent any displacement. Corner protectors must be added to the strapping points.