Microwave drying mechanism analysis
    Initially heated liquid in the material flow within the wet material evaporation and total pressure inside the increasing mass migration mainly dominated by the total pressure gradient , humidity and string ( evaporation rate increases , in other drying string above ) . In other dried strings within the material moisture is still high. Then the material surface humidity string remains unchanged until the humidity dropped to a critical value ( which depends on the type of material ) . After dehumidifying rate decreases markedly with humidity less Sui , fall into the drying rate range . Microwave drying rate and convention obvious difference , which is determined by the characteristics of microwave heating is often put on industrial microwave heating as a reason for the final drying of materials .
    Falling within the scope of the drying rate of the material humidity drops , the material surface water saturation disappeared , leading to the evaporation zone further towards the inside , and continue to deepen . At the same time , the material inside ( center ) of water has dropped to a lower status , physical branch center temperature increased rapidly , and finally the material inside the free water evaporation Yi to do , all for microwave power solid tissue heating material , if this remains original microwave power heating , the material may occur without apparent within the char, rather than the appearance of dry consequences. Therefore , at this time in particular, should pay attention to the material Moisture slaughter dynamic monitoring, timely regulation microwave heating power .
   According to the material when heated drying temperature requirements , you can make out the microwave heating control in factory conditions:
  1 . The material is rapidly heated to the boiling temperature of the moisture . It is not sensitive to the temperature suitable for pre-heating the material , the material is not sensitive to temperature or vacuum drying .
  2 . OBJECTS temperature rapidly reaches its maximum permitted within the heating temperature . It is not suitable for holding large food processing and food quality but also to protect the food is not to be still or baking process .
  3 . Far below the boiling point temperature of the material in a short time heating . It is commonly used in the material off seedlings , pesticides or thawed frozen goods back to temperature and other occasions.