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Drying tobacco

Drytech drying machine use for drying tobacco

In recent years, more and more attentions have been paid to upgrading of the curing barns and development of alternative energy sources of coal in the wake of development of the modern tobacco agriculture. As the environmental heat-generating equipment, the heat pumps have become popular in developed countries. Chinese scientists and engineers, together with some enterprises, have made an attempt to apply the heat pump and its supporting technology to the tobacco curing process. According to the attempts, the heat pump cabinet can make full use of the air source instead of coal to dry tobacco leaves. It is proven that the quality of tobacco dried in such way has been greatly improved and the drying costs has been greatly reduced.


How to dry tobacco with DRYTECH dryer


Curing phase

Automated setting

Temperature setting (°C)

Temperature

-raising rate

Drying time per phase

Total time

Change of tobacco leaves

Attentions

Dry-bulb

Wet-bulb

°C/h

h

h

Yellowing degree

Drying degree

Temperature control

Leaf- yellowing

The first step

34-38

34-36

0.5-1

50-56

50-56

Most of leaves at the upper tier yellow, but their stem is still green.

 

Leaves at the upper tier get soft, and those at the lower tier emit heat.

Yellowing status: leaves at the lower tier or with higher moisture content yellow lightly; leaves at the middle and upper tier do the opposite. At the wet-bulb temperature, leaves with lower moisture content turn yellow heavily, and those with higher moisture content do the opposite.

The second step

40-42

36-38

0.5

25-30

75-86

Leaves at the upper and second tier completely yellow, and those at the lower tier almost yellow.

All leaves and stems become soft.

Make sure that leaves completely yellow and are softened. Leaves at the upper tier and those with higher moisture almost yellow.

Color-setting

The third step

46-48

36-38

0.3-0.5

20-25

95-111

All leaves and their stems completely yellow.

Leaves at the upper tier roll up, and those at the lower tier roll a little.

All leaves completely yellow and roll up. Their stem yellow. The temperature is distributed evenly.

The forth step

52-54

38-40

0.5-0.8

20-24

115-135

Turn the back of leaves yellow to reduce the color difference.

All leaves are rolled good except for their stem.

Extend the drying time to reduce the color difference and to facilitate leaves to roll up; and keep the temperature even.

Stem-drying

The fifth step

60

41

1

12-14

127-149

 

The stem is dried half.

Raise the temperature stably; Don’t lower the temperature; and keep the same humanity.

The sixth step

68

42

1

20-24

147-173

 

The stem is dried up.

Never lower the temperature. Raise the temperature on a stable basis; don't reduce the temperature, or the water in the stem will seep; and don't increase the temperature and the humanity too highly, or the leaves will be dried red.




The drying effect

FreshDried
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