The preparation method of the lyophilized apple slices is characterized in that the specific steps are as follows:
pretreatment of apple: the disease-free and rotting apple is selected
and cleaned, sterilized, mechanically or manually peeled, : Apple
slices into pieces and meet the requirements of the shape of the
2) Shop shelves: the apple slices evenly tiled in the material tray after the transfer to the material shelf;
3) freeze-dried: will be Material car into the freeze-drying warehouse, the apple slices into the freeze-drying warehouse before 1 hour before starting the condensation system, so that the normal operation of the material circulating refrigerant temperature below -30 ° C, open the vacuum pump group must be within 30 minutes So that the degree of vacuum to 133. 3Pa below, then the material was frozen, turn on the heating system, in accordance with the set temperature heating, the curve tends to be consistent, the drying is completed, the time control in 14 hours, the resulting apple slice moisture content in 5% or less; the drying conditions: a cold trap temperature of 57 ° C ± 3, a vacuum degree of 77Pa ± 3, the first 1-2 hours hot plate temperature 98 ° C, the first three hours hot plate temperature 85 ° C, the first 4 hours Hour heating plate temperature 75 ° C, the first 5-6 hours heating plate Of 65 ° C, 7-10 hours heating plate temperature 55 ° C, 11-14 hours heating plate temperature 50 ° C.