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'Cold and warm' cargo in the sea

by:VIPUTRANS     2020-07-28
Mr. A has recently encountered an annoyance. A Japanese customer asked him to purchase shiitake mushrooms. The problem is that the golden season for exporting shiitake mushrooms is from June to August each year. In other seasons, only dried shiitake mushrooms and quick-frozen shiitake mushrooms can be exported, while fresh shiitake mushrooms are moldy when exported in winter. 'Because the container temperature for fresh shiitake mushrooms is hot rather than cold, but without this type of box, only dried and quick-frozen shiitake mushrooms can be shipped this season.' He said.

Mr. B also told C Weekly this story. Once a batch of freezers containing seafood were transported by sea, the power was cut off because the crew did not notice that the freezer suddenly had a problem. When the ship arrived at the destination port, all the seafood in the freezer was damaged. 'Of course, this tragedy happened mainly because of the negligence of the staff. Generally, for high-value products, customers will choose to buy insurance, which is also a guarantee for the export of goods with high temperature requirements.' He said.

For example, Mr. A and B have encountered many products that require container temperature. In the face of these products, the negligence of the staff or the inaccurate business during the shipping process may cause cargo damage. Therefore, before such goods are shipped by sea, export companies must 'prevent problems before they occur.'

Chemical products, food, wood products, etc. have high requirements for container temperature

Li Jinghui, a salesman of the United States and Europe Yunxing (Xiamen) International Freight Forwarding Co., Ltd., told C Weekly that in general, chemical products, food, wood products, etc. have high requirements for container temperature and humidity.

'For example, for food products, excluding sealed packaging and canned food, such as seafood and fruits, these must be in special cabinets and the temperature must be adjusted. If seafood products are used, they need to be adjusted below zero to keep them fresh, that is, frozen for export. Fruits are generally at room temperature. For example, several degrees to ten degrees Celsius can be used to keep these fruits fresh after they go abroad. Sealed packaging products, especially canned food, can be shipped in general cabinets with a shelf life. A freezer is needed,' he said.

The temperature in the general cabinet will change with the change of outdoor temperature

In addition to the internal temperature of the container itself, changes in the shipping process due to changes in the external environment should also be considered, especially certain special items such as firecrackers and military supplies. Because the container is generally a closed box, its internal environmental conditions are relatively harsh. In the hot summer, due to the sun's exposure, high temperatures will be generated inside the cabinet, resulting in material damage. When containers are used for transportation in high-humidity areas, condensation will occur in the containers, causing the materials to become moldy, deteriorated, rusty, and even collapsed, resulting in serious cargo losses.

However, for the goods shipped in refrigerated cabinets, Li Jinghui said that external climatic factors generally do not have much impact on the goods. 'Because the product is in the freezer, the inside of the box will always maintain a specific temperature. But this requirement is very strict. The staff must frequently inspect the cabinet to see if there are problems with the cabinet, such as power failure. If you choose to go to the ordinary cabinet, the export company will also It must be clear whether its products can withstand the test of temperature changes, because ordinary cabinets will change with the temperature changes in various places. In summer, the temperature in ordinary cabinets is higher than outside, so most ordinary cabinets will not take food. Only products such as clothing, machines, and stone can be used.' He said.

High and low temperature resistant products can be protected by packaging
In the case, the fresh shiitake mushrooms purchased by Mr. A's customer are suitable for shipment in June to August when the temperature is high. Of course, there are also some products that will have problems because they cannot withstand high temperatures. A factory exported a batch of furniture to Africa. The first time it was shipped in general cabinets, the outdoor temperature was as high as 50 degrees. As a result, after arriving at the port of destination, it was found that some furniture had cracked, including the leather sofas. In desperation, the factory later chose to use freezers to ship furniture for export. 'If it is normal temperature, the leather is generally not damaged, so the reason may be that the outdoor temperature is too high and the goods are dehydrated. The airtightness of the general cabinet is not as good as the freezer. The air humidity in the cabinet will be based on the external Great changes have taken place in the environment. If air isolation is not done well in product packaging, it is normal for the goods to be dehydrated.' said Zhang Fan, business manager of Weihang (Tianjin) Logistics Service Co., Ltd. Dalian Branch.

Of course, this is only a special case. Under normal circumstances, furniture transportation will choose general cabinet shipment. Regarding the issues that should be paid attention to when packaging products that are afraid of high temperatures, Li Jinghui said that there are two situations. The first is that customers can only spend more shipping costs to transport the goods in the freezer; the second is to pay more attention to the packaging of the goods to prevent high temperature damage, such as choosing to use tin foil, heat insulation paper and other thermal insulation packaging for protection. 'Of course, you can also buy insurance before the goods leave, and you can also seek compensation in case of damage.' He said.

For exporting fresh fruits and vegetables products, Li Jinghui said that there is no doubt that we should choose a freezer. Because the freezer can keep fresh in addition to freezing. After the goods are loaded, adjust the temperature to the best temperature suitable for fruits and vegetables. In this way, whether it is exported to cold northern Europe or hot Africa, the quality of the product will not be affected.

For products that are afraid of low temperatures, Zhang Fan said that by using covering and insulating cotton packaging.

Note: refrigerated (frozen) goods need to be pre-cooled scientifically before packing
During the transportation of refrigerated (frozen) cargo, the required transportation temperature range is generally between -10℃ and -18℃. The transportation temperature requirements must be proposed by the shipper, and the refrigerated container is suitable for the transportation temperature required for various refrigerated goods to be loaded. In the process of exporting refrigerated (frozen) cargo, many shippers are used to pre-cooling the container to a set temperature. Li Jinghui believes that this approach is actually unscientific and may have a negative impact on both the container and the cargo. Therefore, the high quality of container refrigerated (frozen) transportation cannot be guaranteed.

'Because if the container is pre-cooled before loading, when the door is opened to prepare for loading, a large amount of high-temperature and high-humidity air from the outside will enter the cabinet and merge with the low-temperature and low-humidity air. Causes a large amount of water droplets to condense on the inner wall of the container, which will not only affect the normal operation of the container refrigeration system, but may also affect the quality of the goods. Therefore, the evaporator must remove three kinds of heat, that is, the heat that directly enters the container through the door during loading, The heat thrown into the box through the cabinet wall, as well as the heat generated by the metabolism of fresh goods.' He said.

Li Jinghui told C Weekly that the correct way to pack refrigerated (frozen) goods should be to pre-cool the goods to a set temperature, and then quickly enter the container through the insulated passage between the cold storage and the refrigerated container. 'Of course, the temperature of the pre-cooled container is the same as that of the cold storage, and if there is an insulated passage between the cold storage and the container, the container can be pre-cooled before loading.' He said.
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