What is the reason for the dampness of containerized sea cargo?

As a shipping container, it is a safe and economical way. Many exporters will use container house shipping, but can shipping be foolproof? Will there be no surprises? It is true that there will be moisture problems, and while some damages are not serious, some damages are quite serious. Why do containers that are obviously airtight and tight get damp?

One: The container house is not tight

All containers have moisture from the loading period and the cargo itself, and no container is completely airtight. The structural characteristics of the container determine the existence of gaps, especially around the doors. Doing a good job of system security protection measures can effectively prevent serious damage to goods and property loss caused by moisture. When exporting goods, containers must be used. Please systematically inspect the container first. Inspect shipping container house doors, walls, floors, and tops for obvious holes, gaps, and damage. Ensure that the container is comfortable and clean.

Two: Moisture

The moisture in the container mainly comes from the moisture in the air itself, the goods themselves, packaging products (cartons, wooden boxes, etc.), pallets, container floors, container leaks, etc. The International Lessor Association states that the moisture content of the container floor should not exceed 14%. In fact, the average moisture content of containers used by many ports is 18%, or even more than 25%. The key component of container wood flooring is cork board, which has a high moisture content. Some hanging objects should also be packed in wooden boxes. The goods themselves, such as linen and cotton handicrafts, palm tree handicrafts, etc., also have a high water content. Do not use freshly washed, wet containers, use dry containers, pallets and other wooden furniture used in all containers must be dry, the air humidity is best not to exceed 12%, you can use humidity Inspect the portable device (Humidity Detector) to inspect the moisture content of packaging materials. Pay attention to the storage of containers, pallets and corners.

Three: Environment

In fact, in a marine environment, the interior of a shipping container is like a big cage. When it is sealed, the temperature inside the shipping container is about 10 degrees higher than the outside temperature, which changes greatly with the difference in temperature and humidity between day and night. When the goods are transported from the ultra-low temperature area to the high temperature area, or the storage environment of the goods suddenly changes from cold to warm, the moisture in the pallet, wooden box packaging, etc. will also be volatilized, and the water vapor in the gas will be on the surface of the goods Or the packaging will turn into water when it is cold, and the product itself will also leak water. And when the shipping container enters from a high-temperature area to an ultra-low temperature area, its internal working temperature will exceed the moisture content from high temperature to ultra-low temperature, and the water vapor will condense into water droplets, which will solidify on the top of the shipping container and the surrounding inner cavity, and finally drip onto the goods superior. This is why the goods get wet.

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