Method for expanding tobacco shred

Abstract

The invention relates to a method for expanding tobacco shred, which is characterized in that the method comprises the following steps: 1, pre-treating a tobacco shred raw material to ensure the water content thereof to be between 5 and 25 percent; 2, treating the tobacco shred in a container by reducing pressure to ensure the pressure to be not higher than 6kPa, introducing dimethyl ether vapor at a temperature between 10 and 50 DEG C into the container to raise the pressure to 400-1,200kPa, keeping the pressure for 10-30 minutes, and thoroughly soaking the tobacco shred by the dimethyl ether vapor; 3, under the condition of not breaking micropore structures of tobacco shred cells, reducing the pressure to close to atmospheric pressure; 4, injecting water vapor or other heated inert medium into the container to quickly raise the temperature in the container to between 100 and 150 DEG C to expand and mold the tobacco shred; 5, reducing the pressure in the container to 3kPa, readjusting the tobacco shred in vacuum, and adjusting the water content to 12-13 percent; and 6, communicating the atmosphere to raise the pressure in the container to the atmospheric pressure. The method can effectively preserve aroma containing substances in the tobacco shred and with high boiling point, the expanding effect of the tobacco shred is good, the fragmenting rate is low, the safety is high, and no pollution or residue exists.

Description

technical field [0001] The invention belongs to a method for processing shredded tobacco, in particular to a method for expanding shredded tobacco. Background technique [0002] Expanded shredded tobacco, as one of the raw materials of cigarette formula, not only saves raw materials, but also improves the burning condition of shredded tobacco. The most important thing is to reduce the tar and carbon monoxide in cigarettes without reducing the aroma. [0003] There are many ways to expand shredded tobacco, but Freon expansion has not been well resolved due to its solvent residue and ozone layer destruction, and this method has been eliminated. At present, carbon dioxide and nitrogen are commonly used in the world. The high liquefaction pressure of the carbon dioxide expansion process and the freezing of the shredded tobacco after impregnation and decompression determine the complexity and high cost of the process, and the carbon dioxide expansion technology has a large loss,...

AI Technical Summary

Problems solved by technology

The high liquefaction pressure of the carbon dioxide expansion process and the freezing of the shredded tobacco after impregnation and decompression determine the complexity and high cost of the process, and the carbon dioxide expansion technology has a large loss, high equipment repair and maintenance costs, and a large loss of tobacco aroma. , heavy coke gas, dry flue gas, high crushing rate

Although the expansion temperature of nitrogen expansion is low, no pollution, no residue, but the expansion rate is not high, because the pressure is too high, the requirements for the pressure resistance and safety of the equipment are high

[0004] In addition, U.S. Patent 5669397 and Patent CN1099587A use propane as an expansion agent, but its smell will affect the taste of cigarettes; Imperial Tobacco patents CN1210449A and CN1099587A provide a method for expanding tobacco under high-pressure impregnation conditions, and the expansion agent used is different Pentane has low toxicity and low safety

[0005] Because shredded tobacco is prone to produce a large number of complex chemical reactions under high temperature and high pressure environment, the aroma-generating substances with medium and high boiling points are greatly lost, and the traditional shredded tobacco expansion technology has the above disadvantages. Therefore, it is necessary to provide a new method for expanding shredded tobacco

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