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Quick freezing warehouse refers to the method in which food quickly passes through its maximum ice crystal formation zone and freezes rapidly when the average temperature reaches -18 ℃. Food undergoes various changes during the freezing process, such as physical changes, cellular tissue changes, and biological and microbial changes. The general temperature range for a quick freezing cold storage is -15 ℃ to -35 ℃. Quick freezing cold storage is mainly used for low-temperature freezing of food, drugs, medicinal materials, chemical raw materials and other items.