Curing method with dispersed leaf stacking type tobacco leaf loading type sustained temperature-increasing curing, fragrant curing and soft curing for bulk curing barn

Abstract

The invention discloses a curing method with dispersed tobacco leaf-stacking loading type sustained temperature-increasing curing, fragrant curing and soft curing for bulk curing barn. The curing method comprises the following steps of (1) adopting a dispersed tobacco leaf-stacking loading type; (2) setting and executing a dispersed tobacco leaf-stacking loading type sustained temperature-increasing curing, fragrant curing and soft curing technology of the bulk curing barn by a controller of the bulk curing barn, and curing in the air flow ascending type bulk curing barn for the dispersed tobacco leaf-stacking loading type; after yellowing period, color-fixing period and rib drying period, returning moisture, and unloading tobacco leaves. The curing method has the advantages that the curing quality of whole-curing tobacco leaves is ensured; by adopting the technique of moisture maintaining and yellowing, slow color-fixing, slow sustained temperature increasing, and dynamic change of temperature and humidity, the total content of fragrance in the cured tobacco leaves is averagely improved by 9.5%, the number of smooth tobacco leaves is averagely decreased by 38.9%, and the ratio of high-grade tobacco leaves is averagely increased by 13.6%.

Description

technical field [0001] The invention relates to a method for stacking and filling tobacco with loose leaves in a dense curing room and continuously raising the temperature for roasting and roasting, which belongs to the technical field of tobacco leaf roasting. 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 stacking method of loose leaves in dense curing rooms, such as the three-stage curing process and the six-step curing method, all adopt a stepped heating method, that is, there are multiple heating stages and stable temperature stages. Generally, the heating period is shorter and the temperature stabilization period is longer. There are following problems in the practice of tobacco l...

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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) The dry-wet difference in the yellowing stage, especially the early yellowing stage and the mid-yellowing stage, 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 fragrant and soft-cured tobacco leaves

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