Adsorption dryer is through the "pressure change "(pressure change adsorption principle) to achieve the drying effect. Due to the ability to hold water vapor and air pressure is inversely proportional to its part of the dry air (called again angry) decompression expansion to atmospheric pressure, the pressure change make expansion air more dry, then let it flow through turn on the air must be regenerated desiccant layer (i.e., have to absorb enough water vapor drying tower), the water in the dry