It is not polluted and can still be eaten within the shelf life.

Generally speaking, the production of ice cream and ice brick must go through the steps of batching, melting, stirring, homogenization, sterilization, freezing, aging, molding and so on. The main factors affecting the appearance and taste of products are batching and freezing.

Freezing is mainly completed in a sealed container with interlayer, and low-temperature freezing liquid is circulated in the container.

Adding vigorous stirring to freeze one side of the feed liquid,

While being fully mixed with air;

During the freezing process, the air is fixed in the feed liquid, and after aging, the cold drink presents its final form.

After a long time, the moisture on the surface of the cold drink sublimated into the air.

At the same time, due to the temperature change, some micropore structures are destroyed, the frozen air in the ice brick is released, and the volume changes.

Long-term storage in the refrigerator is likely to change the taste. Deformed ice cream may not meet the requirements in the middle of cold storage, which will breed certain microorganisms. People are advised not to eat it. In addition, Dr. Zhu also reminded consumers that ice cream has a lot of calories and is a cold food, which may cause some people's spleen and stomach discomfort.