Container shipping presents fresh challenges for the desiccant method. Extremely high-performance desiccants are needed to cope with the higher rate of air exchange compared to in-box shipping, extreme climatic conditions, and protracted journeys.
Familiar dry granule desiccants according to DIN 55473 can only satisfy the requirements to a limited extent. The quantity of desiccant needed to create humidity of 40 % (for example) would be uneconomically high. Moreover, the desiccant becomes saturated after just a few days, a condition that may have been reached before the container even departs the port. Afterward, your products are left unprotected.
Salt-based desiccants were developed to satisfy the requirements of maritime container shipping. Salts possess high hygroscopic properties and hence have the capacity to absorb vast quantities of water. Two categories can be distinguished:
· Salt/swelling agent blend
· Salt drip systems
Clay and starches are the most common swelling agents, whereby starch is many times more effective. Our SeaDry products, high-performance desiccants for container shipping made of virtually pure calcium chloride and modified starch, are found here.
Drip systems consist of a salt reservoir with access to the air and a drip basin. CHUNWANG does not use drip systems for container shipping and urgently advises against them due to the significant risk potential for brine leakage, especially during the vessel's pitch and yaw movements.
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