Vacuum Freeze Drying Machine is widely used in food, fruit, vegetable, fish, sea cucumer,shrimp, meat drying indstury, chemical and biological industry etc. the dried product dried by freeze dryer is with good taste, beautiful color and good shape:The working principle of This freeze vacuum dryer is that the machine remove the moisture in the pre-frozen material under the high vacuum state, it makes the moisture steamed under Ice state,don't have to melt into water..It means, yes, you are corretc, this machine will pre-frozen the material and then creat high vacuum state to heat the materi to dry with low temperature. which will best maintain the hysical properties, and can keep long after drying,compared with other drying ways.