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How to pack stainless steel sheets to avoid scratch during sea shipping?
Q1: What are the main causes of scratches on stainless steel plates during sea transportation?
A: The primary causes of scratches on stainless steel plates during sea transportation are friction, pressure, and displacement, which can be categorized into four areas: First, there is insufficient isolation between the plates, causing repeated friction during turbulent sea conditions; second, if the packaging is not secured properly, it can lead to movement and collisions of the entire cargo within the container; third, if corner protection is not applied, impacts during loading and stacking can extend to the plate surface; finally, damaged outer packaging can allow seawater and sand to infiltrate, creating scratches. Compared to land transport, the prolonged bumpiness, high humidity, and enclosed environment of containers during sea transport are key factors for the prevalence of scratches.
Q2: What are the core packaging principles to prevent scratches on stainless steel plates during sea transport?
A: The following three core principles should be followed: layered protection, rigid fixation, and friction isolation. First, ensure that the plate surfaces are fully covered to prevent direct contact between plates; second, maintain a rigid packaging structure to limit the movement and shaking of individual plates and the entire cargo; finally, reinforce the corners and edges to reduce damage from impacts. Additionally, the outer packaging must be sealed to prevent dust and moisture, avoiding external contaminants that could cause wear.
Q3: What materials should be used for isolation between layers of stainless steel plates to achieve the best scratch prevention effect?
A: Select appropriate isolation materials based on the grade of the plates and export standards. Cardboard should not be used for direct contact with mirrored or brushed surfaces. 1. For high-end mirror and precision polished plates, it is recommended to use acid-free PE protective film and full coverage of pearl cotton sheets, ensuring the protective film adheres to the plate surface without bubbles or wrinkles to prevent friction from displacement; 2. For regular brushed and frosted stainless steel plates, neutral kraft paper or PP non-slip isolation paper should be used, ensuring full coverage without gaps and prohibiting localized use; 3. For thick industrial plates, non-slip EVA pads are suggested, focusing on covering the core areas of the plate while providing both slip resistance and scratch protection. All isolation materials must be free of sand particles and hard impurities to prevent secondary scratching.
Q4: Should the original factory protective film that comes with new stainless steel plates be retained during sea transportation? Can it be relied upon completely?
A: The original protective film should be retained in full, but it should not be solely relied upon. While the factory film can resist minor abrasions, it cannot withstand prolonged sea transport disturbances and load/unload dragging. In practice, additional mid-layer isolation paper or pearl cotton should be added on top of the factory film, along with a reinforced outer layer for double protection. It is also important to regularly check whether the factory film has any peeling, damage, or delamination, and replace it promptly if any issues are found.
Q5: How should a full stack of stainless steel plates be packaged to avoid internal plate misalignment and friction?
A: A standardized process of "layered isolation + overall tightening + rigid edge protection" should be employed. 1. The individual stack of plates must be aligned neatly to ensure no offset on the plate surfaces and edges; 2. After placing isolation materials between each layer, the entire stack should be wrapped in bubble wrap or pearl cotton to achieve full coverage; 3. The corners of the plates should be fitted with paper or plastic corner protectors, and edge protectors should be added to avoid deformation and scratches from edge compression; 4. Use high-strength packaging straps and non-slip pads to tighten the package effectively.
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