Drying process steps of tobacco dryer
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Which tobacco leaf dryer is good? Guangdong Aubert Energy Saving Equipment has a dryer factory. The dryers are of various styles, good performance, durability and strength.
Brief introduction of tobacco leaves:
Tobacco leaves, annual or limited perennial herbs, Solanaceae plants. The plant is glandular hairy, with a stem height of 0.7-2 meters. The petiole is not obvious or wing-shaped. The panicle inflorescence is terminal. The calyx is simple or tubular bell-shaped, the corolla is funnel-shaped, and the end is pink. The fruit is round or broadly rectangular, yellow-brown. It is native to South America and cultivated all over the world. Tobacco leaves are the raw materials of the tobacco industry.
Tobacco leaf drying process
Tobacco leaf drying is a continuous processing process. For the convenience of process operation, according to the differences in the characteristics before and after the tobacco leaf change process, and the different requirements for industrial conditions in the tobacco leaf change process, the drying process is divided into three stages or periods.
(1) Yellowing period
The temperature should be lower, the humidity higher, the ventilation less and the time longer. The yellowing temperature of tobacco leaves should be controlled at 35℃-38℃, and the dry-bulb temperature difference should be maintained at 2℃-3℃, so that the tobacco leaves reach 70%-80% yellow and the leaves become soft. The yellowing temperature should be controlled below 40℃~42℃, and the wet-bulb temperature should be maintained at 35℃~37℃, so that the tobacco leaves are basically completely yellow, fully withered and collapsed, and the main veins become soft, ensuring that the tobacco leaves are fully transformed and more basic aroma substances are formed. Therefore, the time should be appropriately extended at 419℃~42℃, so that the tobacco leaves reach yellow leaves with slightly green veins, the leaves fully withered and collapsed, and the main veins become soft.
(2) Color fixing period
Remove the water in the leaves and accelerate the drying process. By removing a large amount of water, the changes in the substances in the leaves are restricted and finally stopped, and the quality that has already appeared is fixed. During the dehydration process, the parts that have not yet turned yellow are completely yellowed. Special attention should be paid to the formation of aroma substances and browning reactions, which have a significant impact on quality. To ensure that the tobacco leaves are dry, fully yellowed and aroma substances are formed, higher temperatures, lower humidity, greater ventilation and sufficient time should be adopted. In the color fixing stage, the temperature should be raised at an appropriate rate according to the quality of the tobacco leaves, and the appropriate humidity should be controlled to ensure that the tobacco leaves are completely yellowed and smoothly fixed. At a dry bulb temperature of 46℃-48℃ and a wet bulb temperature of 379℃-38℃, the tobacco leaves and tobacco tendons turn yellow, and the yellow leaves and yellow tendons of the small rolls are kept at a dry bulb temperature of about 54℃. The wet bulb temperature is maintained at 38℃-39℃, and the time is appropriately extended to reach the large rolls of tobacco leaves, which promotes the formation of more aroma substances.
(3) Dry tendon period
It is mainly the period of removing moisture from the main veins. The main veins have a compact structure, large volume, and a long distance for cell water transfer. The vaporization and removal are slow. It is necessary to further increase the temperature and reduce the humidity to achieve the purpose of drying tendons. However, the temperature during the drying period cannot be too high, otherwise it will cause the loss of aroma substances due to volatilization or further transformation, thus reducing the quality. The maximum temperature during the drying period should be controlled at 65℃-68℃, and the wet bulb temperature should be controlled at 40℃-43℃ to enhance the color and chroma of tobacco leaves, while reducing the volatilization and loss of aroma substances in tobacco leaves.
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