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服務項目自有品牌生產 / 來料加工 / 產品研發 /原料采購

 


 RJT凍幹藍莓加工中心,占地麵積1.9平方英畝,廠房麵積32000平方英尺。眾所周知,藍莓的幹燥方法許多,如曬幹、煮幹、烘幹 等,但這些幹燥方法都是在0以上或更高的溫度下進行,
使得產品發生變化,損失部分營養成分。而真空冷凍幹燥技術,則是在-30℃以下預先將藍莓裏麵的水份凍結,而後在真空的環境下將藍莓裏麵被凍結的冰升華,從而得到凍幹藍莓,其產品保留了新鮮藍莓95%以上原有的營養。


 

凍幹食品被人們稱為--太空食品。凍幹藍莓的優異品質,可以簡單概括為:形狀、顏色、口味和營養成分及花青素含量都同鮮果基本保持一致。

 

 

HOW FREEZE-DRY WORKS

 

Simply put, freeze-drying is the removal of water from a frozen product using a process called sublimation. Sublimation occurs when a frozen liquid transforms directly to a gaseous state without passing back through the liquid phase. The process of freeze-drying consists of three phases: pre-freezing, primary drying, and secondary drying.

 

Pre-freezing:

Freeze-dry food must first be pre-frozen below its eutectic temperature, or simply put, freezing the materials (solute) that make up the food. Although a product may appear to be frozen because of all the ice that is present, in actuality it is not completely frozen until all of the solute is frozen as well.

Primary Drying:

After pre-freezing, ice must be removed from the product through sublimation. This requires careful control of two parameters; temperature and pressure. The rate of sublimation depends on the difference in vapor pressure of the product compared to the vapor pressure of the ice collector. Molecules move from the higher pressure sample to the lower pressure sample. Since vapor pressure is related to temperature, it is also necessary for the product temperature to be warmer than the ice collector temperature.

Secondary Drying:

After primary drying, all ice has sublimated but some liquid is still present in the product. Continued drying is necessary to remove the remaining water. The process for removing this excess water is called isothermal desorption. The excess water is desorbed from the product by making the product temperature higher than the ambient temperature.

During the entire freeze-drying process, the exact freezing methodology and proper storage is very important.

 

More Information:

Customers are welcomed to call in for further information online. 

Tel:(+1) 604-381-4562

Email: contact@rjtblueberry.com