generally speaking, 24 hours is possible. But if the foam box is kept at room temperature, 3-dimensional space is nonsense. The preservation temperature of chilled food is 1-2 degrees Celsius, and the insulation effect of foam box is not very good, which is far from the temperature control within 3 degrees Celsius. Once the temperature exceeds 4 degrees Celsius, the preservation time of seafood will be shortened rapidly. Therefore, if enough crushed ice or frozen ice glue is put into it, the professional fresh-keeping temperature can barely be maintained within 24 hours. If you want to store it for a long time, the foam box itself needs to be put into the cold storage. A professional understanding of what the seller said should be like this: (If the outside temperature is normal-about 22 degrees Celsius, and enough crushed ice is put in the foam box), seafood can be stored in the foam box for 1-3 days, (preservation does not mean high-quality preservation, just like so-and-so seafood can be eaten, which does not mean delicious).

the thickness of the foam box, the amount of ice in it and the sealing condition of the box all affect the refrigeration time. I drove to Beijing (711 kilometers), and put some smoked chickens in the foam box for fear of spoilage. I put 8 bottles of completely frozen (about -21 degrees) mineral water in the box. I went to Beijing for a rest one night and picked up the smoked chickens the next morning, and some of the ice didn't melt. It took about 21 hours. If you choose a thicker foam, put more ice, and pack some heat insulation materials outside, it should be longer. If conditions permit, you can buy some frozen bags in the refrigerator (which are filled with special materials, which can absorb more heat and have better refrigeration effect. But if you keep it for a week, it will be more difficult. I'm in a hurry. Consider air consignment. It's more expensive but faster.

Under normal circumstances, they have their own ice factory. First, put a plastic bag in the foam box, then put ice cubes in the foam box to lay a layer of ice, then put seafood in it, then put a layer of ice on the foam box, seal it and pack it. If there is an ice bank, put it directly in the ice bank. If it is a refrigerator at home, I suggest you put it directly in the freezer, and never put it in the fresh-keeping cabinet, otherwise it will stink easily and affect the taste. According to this step, it can be saved for one year under normal circumstances. If you pack the frozen seafood in a foam box without putting ice cubes, it can only be said to be preserved for half a year, and the taste of seafood is seriously affected.

Seafood is different from other meats on land, so it is difficult to keep the freshness of seafood and it is very easy to decrease, because seafood will easily deteriorate and rot if it is not properly preserved. Therefore, we should pay great attention to keeping the freshness of seafood whether it is salvaged or transported.

The foam box is also called the fresh-keeping foam box, because it is easier to keep the temperature unchanged so as to protect the freshness of the products in the foam box. If ice cubes are added to the foam box, the fresh-keeping effect of the foam box will be more obvious, and the seafood is moist, but the foam box can keep the moisture of the seafood well, and it is very convenient to transport with the foam box.

professional fresh e-commerce said: if the outside temperature is about 22 degrees Celsius and enough crushed ice is put in the foam box, seafood can be stored in the foam box for 1-3 days. Seafood e-commerce usually tells buyers that seafood can be stored in the foam box for 1-3 days, but it doesn't mean high-quality preservation, but it only means that seafood can be eaten, which doesn't mean delicious.

according to my experience, if you want the fresh foam box to have better fresh-keeping effect, it is recommended to choose a foam box with thicker side walls, because the foam box with thicker walls has higher density and better heat preservation and cold preservation effect. At the same time, when using ice cubes, it is suggested to use bagged ice bags or mineral water to freeze into ice and then put it in a foam box to avoid the ice cubes melting into water to soak seafood and affect the quality of seafood. If you choose express delivery, it is recommended to choose air transportation. However, it is worth mentioning that if the luggage is checked by plane, the airline stipulates that seafood can be checked, but it is forbidden to put ice cubes in the foam box to avoid melting ice cubes and polluting other luggage.