Kiln Drying Is An Effective Process For Removing Moisture Kiln_Drying_Is_An_Effective_Process_For_Removing_M | Page 3

It is very cost effective and is less prone to distortion and staining. Splitting, warping and
harmful effects of uncontrolled drying are eliminated when one uses kiln for drying
process.
Drying process uses different drying principles and various temperature levels. Drying
is an industrial process and one of the most common type of drying is one in which air is
heated with steam, gas or hot water and then circulated over the wet product.
The drying procedure uses hot air to evaporate water out of the product which needs to
be dried. The cool, humid air is then partly exhausted. The main part of the air is re-
circulated in the dryer. In order to compensate for the exhausted humid air, fresh air
from outside is then brought into the cycle. This fresh air is preheated and then this air
is mixed with re-circulated humid air. This mixture of preheated air and re-circulated
humid air is then heated for acquiring the process temperature.
Drying, is therefore, a mass transfer process which removes water or any other solvent
by way of evaporation from a solid, semi-solid or liquid. It is used as a final product step
before packaging products.
Some of the methods of drying are:
 Application of hot air - This process reduces air relative humidity and thereby
increases the driving force of drying.
 Indirect or contact drying – This is done with the help of drum drying and vacuum
drying.
 Freeze drying - It is a drying method where the solvent is frozen before drying
and sublimed
 Supercritical drying – This involves steam drying of products containing water.
This process is considered because here the water is boiled off and joined with
the drying medium.
 Natural air drying – This process uses unheated forced air. But this process is
slow since it is dependent on weather.
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