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EJER adopts molecular sieve to dry air, the whole system is
controlled by microcomputer, when humidity is high, It will start to absorb
moisture, when the humidity reach the pre-set value, it will stop absorbing,
and then discharge the water to outside the cabinet by heating, again and again
by automatic control. The most effective and environment-friendly
moisture-absorbing desiccant is molecular sieve, molecular sieve is the
microporous crystal material synthesized by silicon and aluminum oxide. In
order to keep the crystal net discharge to be zero, atoms with cations are
located in the crystal structure. and the cation used in these synthetic
crystals is usually sodium. At present, there are two kinds of molecular sieves
widely used in the dry box industry: Class A and Class X. Molecular sieves are
synthesized, shaped and activated under strictly controlled production
processes. The whole controlled synthesis process can ensure consistency of the
three-dimensional pore size. 3A molecular sieve pore size is 3 angstroms, 4A
molecular sieve pore size is 4 angstroms; 13X molecular sieve pore size is 8.5
angstroms. The working principle of molecular sieve: Molecular sieves adsorb
molecules onto the crystal surface by physical attraction force. Since 95%
surface area of the molecular sieve is within aperture, it needs to screen the
adjacent molecules by different size. Only small size molecules can enter into
the inner adsorption surface of the molecular sieve through the crystal
aperture. This selective adsorption phenomenon is called molecular sieve
effect. The molecular sieve adsorption capacity and charge density (polarity)
are further related to the adsorbed molecules. The molecular sieves can further
distinguish which of the mixed molecules can be adsorbed and determine to what
extent the charge density can allow the molecules to be adsorbed onto the
crystal. Water molecules are particularly small (2.6 angstroms), that belong to
highly polar molecules (very strong positive and negative electron density),
and are easily adsorbed by molecular sieves, even under very low moisture condition
,once the water molecules are adsorbed, they will be firmly fixed on the
crystal. The environment-friendly moisture absorption device is equipped with
molecular sieve. When it’s absorbing, the memory alloy controller is in tensile
state, and the spring is in contractive state, which just make the valve
contact the outer baffle, this insulates the outside air from inside dry box
air to achieve dehumidification purpose; and after molecular sieve absorbed
moisture inside dry box and become saturated, the program will automatically
control the memory alloy device to shrink it so that the valve reaches the
inner baffle position. Meanwhile, due to the shrinkage of the memory alloy, the
spring is stretched and the valve is pulled out of the outer baffle, so that
the moisture in molecular sieve will be discharged into the outside. after the
dehumidifying process finished, the program automatically control and reset the
memory alloy and spring, to restart absorbing status….
