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2. Structure Characteristics and Working Principle
2.1 Working Principle
Dehumidifying: damp and hot air from dry material barrel is blown into rotor
after cooled. Moisture from the air is absorbed by rotor and is then adsorbed by
regeneration heating air. Two strands of airflow function on the rotor. And with
the rotation, moisture from the air is absorbed and expelled after absorbed
regeneration air to form stable low dew-point air, which is dried to the drying
temperature and then is blown into material barrel to closed circle to dry
material.
Suction: material is absorbed into barrel from storage barrel or other storage
containers. When the magnetic reed switch detects no material, suction motor
runs to produce vacuum inside vacuum hopper. Raw material in storage barrels
is absorbed into suction hopper due to air pressure difference. When the time is
completed, suction motor stops. Raw materials drop into drying hopper barrel
due to gravity. The dried raw material after dried from is taken out to the hopper
with photosensor installed on moulding machine or other hopper form
drying hopper barrel.
2.2 Relative Humidity and Dew-point
Relative humidity: Relative air humidity means real vapor content to saturated
vapor at the same temperature in percentage. Dew point: it means that
temperature when the saturation vapor begins to dew. When the relative
humidity is 100%, the ambient temperature is the dew point temperature. The
more lower of dew point temperature (than the ambient temperature) is, the
more less possible to dew, that also means the more drier the air is. The dew
point will not be influenced by temperature, but influenced by pressure.
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