A method for improving the uniformity and quality of microwave expansion of tobacco stems

Abstract

The invention discloses a method for improving the microwave expansion uniformity and the quality of tobacco stems, and aims to provide the method for improving the expansion uniformity and the quality of microwave expansion tobacco stems and capable of obviously reducing scorched gas of the tobacco stems. The method comprises the following steps of (1) removing impurities by winnowing; (2) increasing temperature and adjusting humidity; (3) coupling and expanding; (4) shaping; (5) sieving; (6) storing the stems. The average expansion degree of the expansion tobacco stems obtained through the method provided by the invention can achieve 280 percent or above, the expansion uniformity is remarkably improved, the shaping effect is good, slicing and silk making can be carried out favorably, the scorched gas is remarkably reduced, and the quality of microwave expanded cut stems is improved.

Description

technical field [0001] The invention relates to the technical field of tobacco processing, in particular to a method for improving the microwave expansion uniformity and quality of tobacco stems. Background technique [0002] Tobacco stems are an important part of tobacco leaves, accounting for about 25% to 30% of leaf weight. The content of tobacco substances and sugar in tobacco stems is lower than that in leaves, and the miscellaneous and woody gases are heavy and the aroma is insufficient. At present, part of the tobacco stems is used for the production of reconstituted tobacco leaf sheets, and part of the tobacco stems are made into expanded shredded stems by using high-temperature and high-humidity treatment methods. Since the overall treatment process strength of these two methods is weak, the miscellaneous gases in the tobacco stem raw materials cannot be effectively removed, and the smoking quality of the product is not ideal. The usage ratio is lower. [0003] S...

AI Technical Summary

Problems solved by technology

In this patent, the main problem of the pretreatment method is: the humidification efficiency of the vacuum rehydration equipment is too high, and it is difficult to control it precisely during production, which often leads to high water content of the treated tobacco stems and insufficient temperature increase on the surface of the tobacco stems, which affects the quality of the tobacco. Stalk microwave expansion effect

In this patent, the main problem of the pretreatment method before the microwave expansion of the tobacco stems is that the warming and humidification of the raw stems is accomplished by using a moistening drum or HT tunnel to connect with microwave heating equipment, although the tobacco The heating effect of the stem is better, but it will cause the moisture content of the stem to be too high, which will affect the microwave expansion rate of the stem

The main problems in this patent are: (1) The gas heat medium heating pretreatment and microwave expansion treatment of tobacco stems need to be carried out simultaneously in the microwave heating chamber, which requires high manufacturing precision and high production cost. It is conducive to large-scale industrial production and application; (2) Adding superheated steam in the microwave expansion process can easily overheat and carbonize the tobacco stems, resulting in a burnt smell; at the same time, due to strong gas convection, it will also cause the loss of aroma components

The problem with this pretreatment method is that the saturated steam directly contacts the tobacco stems, which will cause the moisture content of the tobacco stems before microwave expansion to be too high, which reduces the microwave expansion rate of the tobacco stems; Released to normal pressure, lack of special tobacco stem expansion unit, poor pre-expansion effect

Among them, the two times of warming and humidification are all using commercially available tobacco warming and humidifying equipment, and the steam at 180-190 ° C is used to heat and humidify the tobacco stems. The main problems of this patent are: (1) Tobacco stem raw materials are subjected to two times of warming and humidification and two times of microwave expansion after screening. Not only the raw material utilization rate is low, but the technological process is relatively complicated, and each microwave expansion treatment has strict restrictions on the expansion rate and moisture content of the tobacco stem. It is difficult to apply in industrial production; (2) The expanded stalks that have been processed by microwave expansion twice are prone to problems such as long time for moistening the stalks in the post-processing process, and it is difficult to penetrate the stalk core, which leads to the post-processing of the expanded stalks. There are problems such as large fragmentation and low yield in the shredded silk, which affect the quality of the expanded stem shreds

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