Microwave tobacco stem expansion method

Abstract

The invention belongs to the technical field of tobacco manufacturing and particularly relates to a microwave tobacco stem expansion technology. The method comprises the following steps of preparation of raw materials, quantitative feeding, temperature raising of tobacco stems, microwave expansion, microwave dehumidification, cooling shaping and production of cut stems. The method has the advantages that the production cost is low, the structure is stable, the cut stems do not retract when absorbing water and can be directly produced without ageing treatment, the seamless joining between specialized, large-scaled and continuous processing of microwave expansion tobacco stems and production of cut tobacco is realized, the cycle of producing, storing and preparing cut tobacco is unnecessary, the logistics and warehousing cost during the ageing period of expanded tobacco stems is unnecessary, and the economic benefits are quite obvious.

Description

technical field [0001] The invention belongs to the technical field of tobacco production, in particular to a technique for expanding tobacco stems by using microwaves. Background technique [0002] At present, expanded tobacco stems have been widely used in the production of cigarettes. The advantages of expanded tobacco stems make their value increasingly prominent. The main performance is that expanded tobacco stems can effectively reduce the carbon monoxide and tar produced when cigarettes are burned and smoked. The purpose of reducing tar and harm and improving the safety of cigarette products; the bitterness, spicy taste, irritation and miscellaneous gas of tobacco stems are significantly reduced after puffing, so that the smoking quality of cut stems is improved; after expansion treatment, cut stems will It becomes soft and bulky, and the content of stem pieces and stem sticks in the shredded stems is reduced, thereby improving the purity of the cut stems; after puffi...

AI Technical Summary

Problems solved by technology

[0007] Chinese published patent CN2607033Y discloses a multi-wave source and multi-feeder microwave expansion tobacco stem device, including a microwave magnetron, a driving power supply connected to the microwave magnetron, The heating box, the inlet and outlet, and the suppression section on the inlet and outlet are provided with a plurality of microwave magnetrons connected to the excitation chamber at the bottom of the heating box, and a preheater is installed at the rear end of the suppression section of the tobacco stem inlet At the same time, a heat preservation section is provided at the front end of the restraining section of the tobacco stem outlet, but this device cannot effectively control the moisture content of the expanded tobacco stem.

[0008] Chinese patent CNl518906A discloses a pretreatment method for tobacco stems treated with microwave after mixing tobacco stems with microwave low-loss solid medium particle heat medium; Lost solid medium particles are used as the heat medium. First heat the heat medium to 100-200°C, then mix the tobacco stems with the heat medium and send them into the microwave heating chamber for heating, so that the volume of the tobacco stems increases and the density decreases, and then the separation The device separates the tobacco stems from the heat medium, recovers the heat medium and reheats them for use, and finally achieves continuous, stable, and high-yield pretreatment of the tobacco stems, but the use of medium tends to increase the heavy metals in the tobacco stems, complicate the production organization, and high energy consumption , and still cannot solve the water absorption shrinkage of tobacco stems when they are directly shredded, and must be stored and aged

[0009] Chinese patent CN 202077560 U discloses a drum-type tobacco stem continuous microwave expansion device, which can realize continuous transportation of tobacco stems without intermittent discharge Empty feeding, the path of the tobacco stems turning over in the drum is the same, the absorption of microwave energy is consistent, and the expansion degree of the material is consistent. Low, it is easy to cause the tobacco stems to be broken and increase, and the tobacco stems will shrink when they are directly shredded, so they must be stored and aged

[0010] The deficiencies in the above prior art are that the microwave treatment process method without expansion medium is used to obtain poor product expansion uniformity; Difficult to operate, high energy consumption

[0011] The above-mentioned devices, equipment, and techniques have a common problem: when the expanded tobacco stems are directly put into the production of shredded stems, the volume of the tobacco stems will shrink after absorbing water. It is close to the pre-expansion state and loses the meaning of expansion. It must go through a storage and setting period of more than 7 days to ensure that the volume of the expanded tobacco stem does not shrink after absorbing water during shredding. Therefore, the expanded tobacco stem produced by the existing microwave process has seriously restricted Large-scale technological application of microwave puffed tobacco stems