Why is the container shipping cargo damp?

As a safe and economical way to transport goods, container shipping is the favorite method for most exporters. But going by sea will encounter moisture problems. Although not every time, but eventurally you will encounter serious losses. Some of them were OK for the first few times, but by the sixth and seventh times, they encountered serious losses due to dampness.


Many people wonder why I have packed the goods in tightly closed containers and still get damp. Where is the water come from? The answer is that water is always there inside the container, and you need a container desiccant.


First, the container is not perfect box. All containers will have moisture from the loading period and the cargo itself, and no container is completely sealed and tight. The structure of the container determines the existence of gaps, especially near the door. Good system protection measures can effectively prevent the goods from serious damage and economic loss due to moisture. When using container to export. Please systematically check the container first. Check the door, wall, floor and top of the container for obvious holes, cracks and damage. Make sure the container is dry and clean.



Secondly, where does the moisture in the container come from?

The moisture in the container mainly comes from the moisture in the air itself, the cargo itself, the packaging materials (carton, wooden box, etc.), the pallets, the wooden floor of the container, and the leakage of the container, etc. The International Association of Container Lessors stated that the moisture content of container wood floors must not exceed 14%. In fact, the average container moisture in many ports is still 18%, and even more than 25%. The main component of the container floor is cork with high moisture content. Some heavy objects have to use wooden boxes. The goods themselves, such as cotton and linen products, palm products, etc., also have a high moisture content. Never use freshly washed, hot and humid containers, use dry containers. All pallets and other wooden products used in the containers must be dry. The relative humidity should not exceed 12%. You can use a humidity card to detect packaging materials. Water content. Pay special attention to the storage of containers, pallets and corner protectors.


In fact, in the ocean environment, the container is like a big steamer. When the temperature inside the container is higher than the outside temperature by more than 10 degrees, the temperature and humidity difference between the day and night of the ocean will change drastically. When the goods are transported from a low temperature area to a high temperature area, or the cargo storage environment suddenly changes from cold to hot, the moisture in the pallet, wooden box, etc. will also be evaporated, and the moisture in the air will be on the surface of the cargo or its packaging When condensed to form water, the cargo itself will also emit water. When the container enters the low temperature area from the high temperature area, the internal ambient temperature changes from high temperature to low temperature to reach the dew point temperature, the water vapor will condense into water droplets, and condense on the top of the container and the surrounding inner wall, and finally drip onto the cargo. This is why the goods get wet.


Friendly reminder: Please use container drying bars and drying rods, and take measures to prevent moisture in advance. The purpose is to absorb moisture from the air to reduce the amount of moisture entering the container. The amount of container desiccant used depends on the type of cargo, the length of the voyage, and the acceptable degree of damage. Generally, a 20-foot cabinet is recommended to use more than 6 1 kg container drying strips, and hang the container drying strips on the hanging ring on the inner wall of the container. If the moisture content of the packaging material in the container is high, if the wooden box, pallet, etc., the amount of container desiccant should be increased. Valuable goods should be properly protected and increased. You can also flatten some containers to dry pack on the carton.

In short, the cost of using desiccant is very low, far inferior to the goods themselves. It is a very effective solution to protect the goods at a very low cost.