1.How can we reduce the risk of bruising from the source?
Strictly control roll system quality: Establish a dedicated roll management system to ensure that the rolls and tension rolls used on the machine are free of defects such as cracks and chipping, preventing these defects from periodically replicating onto the strip.
Ensure unit cleanliness: Regularly clean oil sludge and iron powder from the stand, and control the dust level within the unit (domestic leading companies can control it to less than 10mg/dm² per month) to prevent foreign objects from falling onto the roll surface and pressing into the strip.
Optimize process parameters: Control the cleanliness of the emulsion (e.g., requiring the surface reflectivity of the rolled strip to be no less than 70%) to prevent thermal scratches or roll sticking due to poor lubrication.
2.How can packaging protect the product?
Inner layer rust prevention and cushioning: Fully enclosed packaging using rust-proof paper and industrial film provides moisture and rust protection. Paper corner protectors are installed at the inner and outer ends of the steel coil to cushion external forces and protect the edges. For thin-gauge steel coils requiring extremely high surface quality, an additional layer of corrugated cardboard can be added between the inner and outer packaging to effectively prevent damage.
Outer layer robust protection: An inner circumferential protective plate is placed on the inner ring of the steel coil, and an outer circumferential fiber protective plate is placed around the outer ring. End fiberboard or plastic/galvanized end protectors are installed at both ends to form a robust outer shell. Finally, steel corner protectors are installed at the inner and outer edges of the steel coil, and steel straps or PET straps are used to cross-tie and secure the packaging layer radially and circumferentially to ensure it remains secure.
3.What precautions should be taken during hoisting operations?
Use specialized lifting equipment: C-hooks, specialized coil lifting clamps, and other specialized equipment must be used. Direct lifting with forklift forks or wire ropes is strictly prohibited to avoid edge damage or marks.
Handle with care: Lifting must be stable, precise, and gentle to prevent collisions between the steel coil and other hard objects (such as equipment frames or other steel coils).
Protect lifting equipment: Ensure that the parts of the lifting equipment that contact the steel coil are padded or smooth and free of burrs to prevent new indentations during clamping.
4.What precautions should be taken when warehousing and transportation?
Safe Storage:
Ground Protection: Steel coils must not be placed directly on the ground. They must be placed on wooden blocks, rubber mats, or a dedicated V-shaped saddle. The ground must be flat, clean, and free of sand and gravel.
Proper Stacking: Strictly control the number of stacking layers (generally, commercial steel should not exceed 2 layers). Place cushioning materials (such as felt or rubber mats) between layers of steel coils to prevent rigid contact and potential damage.
5.What are the requirements for stable transportation?
Cargo compartment preparation: Before loading, ensure the cargo compartment is flat and clean, and lay down rubber mats or wooden blocks.
Effective securing: Inside the transport vehicle, use specialized coil brackets/wedges, heavy-duty strapping straps, or chains to securely lock the steel coils, preventing them from rolling or colliding during transport due to bumps or sudden braking.