Atmospheric Environment
Atmospheric environments inside steel shipping vessels fluctuate according to external weather conditions and the respiration of the packed goods. The ocean container microclimate often reaches extreme temperatures as the sun hits the metal skin of the unit during the day. Moisture trapped in the air or the wooden pallets can then condense as the temperature drops at night.
Cycles like this repeat throughout the duration of the voyage. Condensation management is necessary to protect sensitive textile stock.
Temperature Fluctuation
Thermal variations create a dynamic state where the air can hold different amounts of water vapour. Within the ocean container microclimate, the air near the roof becomes much hotter than the air near the floor. Convection currents then move humid air towards cold surfaces.
Moisture Accumulation
Cumulative humidity levels can lead to the growth of mould or the corrosion of metal components like zippers. If the ocean container microclimate remains saturated for several days, the moisture might penetrate the inner cardboard packaging. Sagging cartons or water-stained polybags are typical signs of this problem.
Cargo Protection
Mitigation strategies include the use of high-capacity desiccants and moisture-impermeable liners. Because the ocean container microclimate is difficult to control from the outside, the focus remains on isolating the product. Monitoring devices placed inside the load provide a record of the environmental history.
