Medium and low temperature CO2 expansion process for shredded tobacco

Abstract

The invention belongs to a low-temperature CO2 expansion process for shredded tobacco, comprising the following steps: ① immerse shredded tobacco with a moisture content of 18% to 20% in liquid CO2 for 60 to 100 seconds to obtain shredded tobacco with dry ice; ② immerse shredded tobacco with dry ice obtained in step ① After the shredded tobacco is loose, it enters the HT steam expansion device through quantitative feeding for pre-expansion; ③The pre-expanded shredded tobacco is sent to the air dryer for expansion and drying, and the flow rate of the hot air entering the air dryer is 21m / s~23m / s , The temperature is 200 ℃ ~ 230 ℃. Adopting the process of the present invention reduces the treatment intensity of the carbon dioxide process, reduces the fragmentation during the expansion process, improves the whole cut rate of the expanded cut tobacco, and the whole cut rate is 74% to 78%, reduces the broken shred rate, and the broken shred rate is 1.4% to 2.1%, Improve the change rate of the whole yarn rate, and the change rate of the whole yarn rate is 73% to 77%.

Description

technical field [0001] The invention relates to the field of tobacco, in particular to a medium-low temperature CO 2 The expansion process is mainly used in the processing of shredded leaf in cigarette enterprises. Background technique [0002] During the current cigarette production process, CO 2 Cut tobacco expansion technology is the most mature and popular. Its main steps are: the tobacco leaves are subjected to vacuum re-moisture, loose re-moisture, mixed pre-storage and shredded tobacco leaves to obtain shredded leaves with a water content of 22% to 24%. 2 Dipping for a certain period of time (60s) to form dry ice shreds. After being loosened, they are then heated instantaneously by hot air at a high speed of 27m / s to 31m / s at a high temperature of 320°C to 350°C. The shredded leaves are fully expanded and made into shredded leaves with a moisture content of 6% to 8%. After regaining moisture, the moisture content reaches the requirement of 12.7% to 13.8%, which is s...

AI Technical Summary

Problems solved by technology

Its advantage is high filling capacity, reaching 6.5cm3 / g~7.3 cm3 / g, which can effectively remove miscellaneous gases in shredded tobacco, improve the product quality of cigarettes, and reduce the amount of tar in cigarette smoke; its disadvantage is that during the production process, the production of shredded tobacco Larger shreds, serious loss of some chemical components of shredded tobacco, more aroma loss, heavy burnt smell, dry smoke, 50% to 60% lower change rate of shredded shreds, high production cost, and carbonization of shredded tobacco during the production process, serious Sometimes it even catches fire and smokes