1.How effective is vacuum packaging for rust prevention in cold-rolled coils?
Extremely strong rust prevention: By vacuuming and injecting inert gas (such as nitrogen), the oxygen concentration and water vapor inside the packaging are reduced to the lowest possible level, achieving an ultra-long rust prevention period of more than 12 months, which is especially suitable for long-term strategic reserves or extreme environments (such as high salt spray sea transport).
2.What is the cost of vacuum packaging cold-rolled coils?
High cost: This is mainly reflected in three aspects: First, it requires professional vacuuming equipment and multi-layer composite materials (such as aluminum-plastic composite film); second, the operation process is complex and time-consuming; and third, the maintenance cost is high. The overall cost index can be more than four times that of traditional rust-preventive oils.
3.Is the vacuum packaging operation for cold-rolled coils complicated?
High operational requirements and difficult to repair: The packaging process requires specialized equipment. Once the packaging is damaged during transportation or storage (such as by being punctured by a sharp object), the vacuum environment will fail instantly, the protective barrier will be broken, and it will be almost impossible to repair on site.
4.How effective is the physical protection provided by vacuum packaging for cold-rolled coils?
Integrated physical protection and rust prevention: Vacuum packaging is usually used in combination with multi-layer cushioning materials (such as non-Newtonian fluid cushioning layers and honeycomb panels) to make the packaging film adhere tightly to the surface of the steel coil. It can not only prevent rust, but also effectively prevent mechanical scratches and impacts during transportation, providing all-round protection.
5.How efficient is vacuum packaging and unpacking of cold-rolled coils?
Low packaging and unpacking efficiency: Compared to automated stretch wrap packaging, vacuum packaging is more cumbersome (such as the multi-zone heat sealing process mentioned in the patent) and slower. Furthermore, unpacking before use requires more effort from the user than unpacking ordinary packaging, which can affect production cycle time.