19(83)
2. Structure Characteristics and Working Principle
2.1 Working Principle
The moisture contained in the air which is waited for treating) will be absorbed
by hygroscopic materials, hereafter, be de-absorbed by the regenerated hot air.
And the two airstream work together in the rotation wheel. So, with the rotation
of the wheel, moisture will be absorbed and de-absorbed continuously, and
drain out via de-absorbing by regenerated air to form a steady low dew point
airstream for using.
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.
2.3 Why Choose SD-H
The main reason for the defects of plastic products, such as bubbles, silver lines,
flaws, poor transparency, etc. is that plastic raw materials are not completely
dried before moulding. Hygroscopic plastics, such as PA, PC, PBT, PET,
NYLON and so on, can not be thoroughly dried through traditional methods. It is
proved that heated and dehumidified air with low dew-point down to -40 ℃ can
make moisture content of such materials over than 0.02% before moulding.
SD-H honeycomb dehumidifiers, utilizing honeycomb-rotor in a full-closed
system to dehumidify process air, can meet such requirements. Hot air with low
dew-point produced by this unit is quickly and continuously blowed to plastic
particles to completely absorb the moisture, thus to gain a good drying and
dehumidifying effect.
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