- It improves fermentation and increases the quality of tobacco
- It provides elasticity of outer sheets
- It prevents loss of aroma during the storage of finished products
- It prevents drying and crushing of cigars and cigarettes in warehouses and stores
Tobacco is extremely hygroscopic (absorbs or releases moisture until a balance between tobacco and air is achieved). The air extracts moisture from tobacco if the tobacco is damper than the ambient temperature in which it is located. This is a simple drying mechanism. If the drying of stored tobacco is to be avoided, it is enough to ensure a balance between the moisture content of the air and the desired moisture content in the tobacco.
Recommended values of relative humidity of air in the warehouse and processing of tobacco:
od – do°C
od – do %
|Storage of raw tobacco|
|20 – 25°C||70 – 80%|
|Storage of paper filters||20 – 22°C||55– 65%|
|Wet room for rolling|
|25 – 30°C||95%|
|Preparation of the outer sheets ||5 – 10°C||95%|
|Cutting room||22 – 24°C||60%|
|Production plant units|
|20 – 22°C|
20 – 26°C
|18 – 20°C||55 – 60%|
|“Walk-In” humidors||18 – 20°C||55 – 60%|
* Fermentation is also improved without presence of mold.
** In order to achieve the desired elasticity of the outer sheets, the air must be saturated with moisture.
*** The appropriate air humidity ensures that cigarettes slightly lose their humidity and that they are stored on a humidity level suitable for packaging. The air that is too dry causes a loss of aroma. The air that is too damp leads to the formation of mold.