苹果冷冻干燥工艺优化

The Optimization of Freeze-drying Technology of Apple

对苹果进行冷冻干燥实验,确定了苹果片冻干工艺条件。计算了冻结时间,干燥时间,并与实验值进行了比较。探讨了冻结速率,物料温度,干燥室及捕水器温度、压强对冷冻干燥过程及制品质量的影响。苹果冷冻干燥优化工艺参数为:冻结时间1.0h,升华干燥、解吸干燥时干燥仓压强分别为70～90Pa、20～30Pa,解吸干燥时物料温度50～60℃,物料厚度10mm,干燥时间为10h。

The freeze-drying experiment of apples was studied in the paper, and obtained the freeze-drying technology for apple slice. The freezing time, drying time were calculated, and contrasted by experimental value. The influence of freezing rate, materiel temperature ,the temperature and pressure of drying room and water catching machine on the freeze drying process and the quality of the products was discussed. The optimal parameters of freeze-drying technology for apple slice are that the freeze time is 1.0h, sublimation and desorption pressure of drying room is 70～90Pa and 20～30Pa, materiel temperature in desorption is 50～60℃, material thickness is 10mm, freeze-drying time is 10h.