1Food freeze dryerKey parameter analysis
Freeze drying area and processing capacity
Freeze drying area: directly determines the equipment's single processing capacity. Each square meter of freeze-drying area can load about 10 kilograms of material, and users need to choose according to the production scale (such as 0.1-0.5 square meters for small laboratories and 2 square meters or more for industrial production).
Loading method: The contact freeze-drying machine transfers heat directly through the partition, with precise temperature control, suitable for high value-added foods; Radiation freeze-drying machine for pre freezing and drying separation has high efficiency and is suitable for large-scale production.
Cold trap temperature and water capture capacity
Cold trap temperature: The lower the theoretical temperature, the stronger the water capture ability, but the cost increases. -60 ℃ is a universal choice, suitable for most foods; -80 ℃ is suitable for special high boiling point solvents or bioactive substances.
Water capture rate: should not be less than 10kg/㎡ to ensure efficient removal of water.
Vacuum degree and vacuuming time
Extreme vacuum degree: The food freeze dryer needs to reach 5-15Pa. Excessive vacuum degree is not conducive to heat transfer and instead reduces the drying speed.
Vacuum extraction time: From atmospheric pressure to 15Pa, the food freeze dryer should be ≤ 0.75 hours to ensure rapid entry into the drying stage.
Uniformity and flatness of plate temperature
Temperature uniformity: The temperature difference between the layers of the food freeze dryer can be appropriately relaxed, but it needs to be controlled within ± 2 ℃ to ensure consistent product quality.
Flatness: Surface flatness ± 1mm/m, roughness Ra<0.75 μ m, in compliance with GMP requirements.
Control System and Security
Control system: It needs to display real-time parameters such as temperature and vacuum degree, support process program setting and modification, and have communication interfaces for data acquisition.
Safety performance: The insulation resistance of the whole machine is ≥ 1M Ω, with leakage and overcurrent protection to ensure safe operation.
2、 Industry application adaptation strategy
Freeze-dried fruits and vegetables
Requirement: Preserve color, aroma, taste, and nutritional components.
Adaptation strategy: Choose a contact freeze-drying machine with precise temperature control to avoid high temperature damage to nutrients; Cold trap temperature -60 ℃, vacuum degree 10-15Pa, ensuring quality.
Meat products freeze-dried
Requirement: Efficiently remove moisture and extend shelf life.
Adaptation strategy: Radiation freeze-drying machine, pre freezing and drying separation to improve efficiency; The freeze-drying area is selected based on production capacity to ensure continuous production.
Coffee and tea freeze-drying
Requirement: Preserve flavor and enhance market value.
Adaptation strategy: Contact freeze dryer with high uniformity of plate temperature to ensure even drying; Cold trap temperature -80 ℃, suitable for high boiling point volatile components.
Seasoning and food additives freeze-drying
Requirement: Precise temperature control to avoid component decomposition.
Adaptation strategy: Select a freeze dryer with multi-stage temperature control function to ensure precise temperature control at different stages; Stable vacuum degree to avoid oxidation.
Freeze drying of traditional Chinese medicine and health products
Requirement: Retain active ingredients and extend shelf life.
Adaptation strategy: Contact freeze-drying machine, precise temperature control, avoiding high temperature damage to activity; Cold trap temperature -60 ℃, vacuum degree 5-10Pa, ensuring quality.
3、 Selection suggestions
Clarify the application scenario: Select the appropriate freeze-drying area and processing method based on the type of food, production scale, and quality requirements.
Comparison of technical parameters: Focus on core indicators such as cold trap temperature, vacuum degree, and uniformity of plate layer temperature to ensure that equipment performance meets requirements.
Evaluate brand and after-sales service: choose well-known brands to ensure equipment quality and after-sales service; Pay attention to the warranty period, technical support, and spare parts supply situation.
Consider cost-effectiveness:Food freeze dryerTaking into account factors such as equipment performance, brand, and after-sales service, choose products with high cost-effectiveness to ensure long-term returns.