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Why use container desiccant when exporting goods?

Release time:

2022-06-01

In recent years, for many foreign trade enterprises and factories, container desiccants are no longer strange. Back to the southern sky and plum rain season, most export commodities will put desiccants in containers. So why use container desiccant when exporting goods?

1. Common cargo containers are not absolutely airtight. First of all, the container door is not absolutely closed. Secondly, there are air holes near the four corners of each container, which are used to balance the pressure changes caused by thermal expansion and cold contraction. Due to the existence of air vents, the air inside the container is interconnected with the nature, so the external water vapor will continue to enter the container. The relative humidity of the air near the sea level is close to 100%. The longer the total storage and transportation time, the more water vapor will be exchanged with the outside world. Therefore, we usually recommend that customers seal these air holes with adhesive tape before installing the cabinet.

2. Moisture in goods and packages will be released into the air under certain temperature conditions. Many goods (especially high-risk fabrics such as wood, leather, cotton and linen, fiber) and packaging (cartons, wooden cases, wooden pallets, etc.) contain moisture, which will be released into the atmosphere under certain conditions (temperature rise).

3. Weather, shipping route, sailing season and other factors during packing affect the temperature and humidity in the container. Generally, it is better to choose sunny days for loading, or it is better to avoid loading at noon or at night when the humidity is high. If the cabinet is installed in rainy season, we generally recommend the customer to put more desiccant. According to our experience, in container transportation, the goods transported from hot places to cold places are always at high risk of moisture. Therefore, for the goods transported from the northern hemisphere to the southern hemisphere (or the route must pass through the southern hemisphere) in summer, the moisture-proof protection measures must be taken in the container. It is more necessary to adjust the amount of container desiccant according to the length of the voyage.

4. The position in the cargo hold of the container also affects the temperature and humidity in the container loading. Generally, the containers at the top and side of the cargo ship are more exposed to the sun, and the temperature difference between day and night is larger than that in the middle and bottom containers.

5. The desiccant products placed in the product packaging are different. Desiccants in product packaging generally include silica gel, minerals, calcium chloride, etc. As the moisture absorption rate of silica gel and mineral desiccant is generally only about 30%, if such desiccant is used in export packaging, it is recommended to increase the amount of container desiccant.

In conclusion, although the risk of moisture and mildew in winter is lower than that in spring and summer, desiccant should also be used in containers when exporting goods in winter. Based on years of experience in moisture-proof shipping, Tai Wang company gives the following suggestions. For different products, we will also provide our customers with detailed moisture-proof solutions.