What are the main parameters to consider when purchasing a freeze-drying machine?
When selecting a freeze dryer for food processing, three core technical parameters deserve your close attention: shelf area, condenser temperature, and ultimate vacuum level. For most food applications, a condenser temperature of approximately -45°C and an ultimate vacuum of 10 Pa are generally adequate to ensure efficient sublimation. That said, shelf area is the most commonly misunderstood parameter. Some suppliers claim a batch capacity of 50 kg but offer only 4 m² of shelf area — a clear mismatch. In reality, such equipment cannot achieve the stated throughput, regardless of vacuum performance. Why? Because freeze-drying efficiency depends not only on moisture content and vacuum level, but also on material loading thickness. Overloading the trays slows heat transfer and vapor escape, drastically reducing drying efficiency — even for low-moisture products like candy. At Kemolo, we believe in transparency. We publish accurate shelf areas, test our condenser performance under real conditions, and verify every vacuum reading against factory acceptance standards — so you can make decisions based on facts, not marketing claims.
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