Mainly by the plate heat exchanger plate, rubber mat and frame. Is hot and cold two kinds of different temperatures of the liquid transfer temperature, to achieve high temperature side of the cooling, low temperature side of the heating purposes. In the pharmaceutical industry, mainly used for liquid material recovery (extraction, cooling tower), according to each kind of material is not the same as the evaporation temperature, recovery of modified materials. Why not just use the tube heat exchanger, the main reason is the tube fouling cleaning is not easy to heat exchange efficiency is low, the material temperature becomes high, resulting in impure extracts