Bulk curing barn hanging rod continuous heating fragrant and soft roasting method

Abstract

The invention provides a bulk curing barn hanging rod continuous heating fragrant and soft roasting method, and the method employs a technology of moisturizing and yellowing, slow color fixing, slow continuous heating, and temperature and humidity dynamic changing, guarantees that when the baking time of tobacco leaves at each layer in a curing barn is within a temperature and humidity range suitable for quality modulation is enough and has little difference, i.e., enabling the tobacco leaves at each layer to be yellowed fully and macromolecule materials to be fully or moderately degraded and converted into more aroma components, achieving the timely color fixing and reinforcement of quality, achieving the yellowing, fragrant roasting, soft roasting and mature roasting of tobacco leaves at each layer in the curing barn, and improving the tobacco leave baking quality and the industrial usability. The method provided by the invention is simple and clear, and is convenient for a baking person to master, set and modify.

Description

technical field [0001] The invention belongs to the technical field of tobacco leaf curing, and in particular relates to a method for continuously raising the temperature and roasting for fragrant roasting and soft roasting by hanging tobacco on a rod in a dense barn. Background technique [0002] Tobacco leaf curing is inseparable from the baking process. The curing process is the specific requirements and control technology for variables such as dry bulb temperature, wet bulb humidity, and curing time during the tobacco leaf curing process. At present, the tobacco leaf curing process applied in the way of hanging tobacco in dense barns, such as the three-stage curing process and the six-step curing method, all adopt a stepwise heating method, that is, there are multiple heating stages and stable temperature stages. The heating period is shorter, and the temperature stabilization period is longer. There are following problems in the practice of tobacco leaf curing in thes...

AI Technical Summary

Problems solved by technology

[0005] (2) The duration of the temperature stabilization stage is too long, generally at 34°C for 10 hours or more, at 38°C for 18 hours or more, at 54°C for 12 hours or more, etc. quality

Therefore, the temperature and humidity displayed by the controller can only represent the baking process conditions of the tobacco leaves in the shed where the main control sensor is placed. The process is suitable, and often the curing process of tobacco leaves in other sheds is not suitable or not suitable, generally because the temperature is low and the relative humidity is high

If the duration of the temperature stabilization period is too long, it is actually not conducive to the quality modulation of tobacco leaves in other sheds. For example, if the temperature stabilization time is too long at 34°C and 38°C, the temperature of tobacco leaves in other sheds is lower, and the activity of enzymes such as hydrolytic enzymes will be reduced. The degradation rate of internal macromolecular substances such as starch, protein, chlorophyll, etc. is relatively slow, which is not conducive to their full or proper degradation. Beyond the temperature and humidity range suitable for the degradation and conversion of macromolecular substances, due to the higher temperature and lower humidity, more free water in the tobacco leaves will be vaporized and discharged, resulting in lower moisture content in the tobacco leaves, and the activity of hydrolytic enzymes will be inhibited, and there will be no It is conducive to the full or proper degradation and transformation of macromolecular substances, and the amount of small molecular substances such as amino acids, monosaccharides and other aroma-generating substances and aroma precursors produced is insufficient, resulting in insufficient aroma of some tobacco leaves after roasting, and the structure is stiff and not loose. , not soft

In addition, although a longer temperature stabilization at 54 °C is beneficial to the production of more aromatizing substances in the tobacco leaves in the shed where the main control sensor is located, but the tobacco leaves in other sheds have lower temperatures and produce less aromatizing substances. Fast, soon passed the temperature stage suitable for the formation of aroma substances

It can be seen that the duration of the stable temperature stage is too long, which is not conducive to the quality modulation of tobacco leaves in other sheds, that is, it cannot ensure that the tobacco leaves on the kang are fragrant, soft and cooked.

[0006] (3) In the yellowing stage, especially in the early stage of yellowing and the middle stage of yellowing, the dry-wet difference is relatively large. When the dry bulb temperature is 38°C, the wet bulb temperature is about 36°C, and when the dry bulb temperature is 40°C, the wet bulb temperature is At around 37°C, the tobacco leaves will lose more free water, which will affect the activity of hydrolytic enzymes and other enzymes, which is not conducive to the degradation and transformation of macromolecular substances, and is not conducive to the full yellowing of tobacco leaves, which is not conducive to the roasting of tobacco leaves.

[0007] (4) These stepped heating and baking processes cannot meet the needs of all tobacco-loading methods for roasting, roasting, soft-roasting and ripening tobacco leaves

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