★ What Is a Blast Freezer

A blast freezer is a specialized cold storage unit that rapidly moves food through its maximum ice crystal formation zone (-1°C to -5°C), completing quick freezing when the core temperature of the food reaches -18°C. The typical temperature range for a blast freezer is -15°C to -35°C, widely used for low-temperature rapid freezing of food, pharmaceuticals, medicinal herbs, and chemical raw materials.

The core value of blast freezing: During the freezing process, food undergoes physical changes (volume and thermal conductivity), chemical changes (protein denaturation, color alteration), cellular tissue changes, and microbial changes. Rapid freezing minimizes these changes, allowing thawed food to retain its original nutritional value, color, aroma, and flavor to the greatest extent possible. In other words, blast freezing is about "locking in freshness" rather than "freezing to death."

Large-scale blast freezers are typically constructed in combination with low-temperature storage rooms and cool storage rooms. For small-scale requirements, modular (prefabricated) blast freezers are available, offering the advantages of lower investment, faster construction, and complete functionality.

★ Differences Between Blast Freezers, Cold Storage Rooms, and Fresh-Keeping Rooms

Many customers have a vague understanding of cold storage types. We clarify the distinctions here:

1. Fresh-Keeping Room

Temperature: 0°C to 5°C

Function: Puts agricultural products into a "dormant" state, maintaining freshness and reducing nutrient loss

Application: Fresh produce with high respiration rates, such as fruits and vegetables

2. Cold Storage Room

Temperature: -15°C to -18°C

Function: Long-term stable storage with irregular loading and unloading

Application: Meat, seafood, frozen food, such as supermarket cold storage

3. Blast Freezer

Temperature: -25°C to -35°C

Function: Rapidly passes through the ice crystal formation zone, locking in the original quality of food

Application: Food, medicinal herbs, and chemical raw materials requiring rapid freezing