Vacuum moisture regaining equipment based on threshing and redrying and process control method thereof

Abstract

The invention relates to vacuum moisture regaining equipment based on threshing and redrying and a process control method thereof, and belongs to the technical field of tobacco leaf processing. The vacuum moisture regaining equipment comprises a vacuum moisture regaining machine, a vacuumizing system, a humidifying system, a steam distribution system, an air compression and instrument system, a cooling-condensate water discharging system, a feeding and discharging system, a safety device and the like. The back penetration rate of the tobacco leaves is controlled to be 60-70%, the core wrappingtemperature is controlled to be 35-55 DEG C, and the moisture content after moisture regaining is 16.0-17.5%. The control standard of high back penetration rate during traditional tobacco leaf vacuummoisture regaining is broken through; and through cooperation of equipment and a process, 60%-70% of back penetration rate is used as a control index, so that the vacuum moisture regaining processingintensity is reduced, an equilibrium point of seeking water uniformity, minimizing the loss of aroma substances and controlling the crushing waste of tobacco leaves in the inner part of the tobacco package or the vacuum moisture regain processing cycle is achieved, the processing moisture regaining intensity is reduced, energy is saved and consumption is reduced, the leaf selecting and laying efficiency is not affected, and crushing is not increased.

Description

Technical field [0001] The present invention belongs to the technical field of tobacco leaf processing. Specifically, it relates to a vacuum moisture regaining equipment based on threshing and redrying and a process control method thereof. Background technique [0002] In recent years, in the field of threshing and redrying of the cigarette industry, the technical upgrading direction of "four modernizations and one protection" has been clearly proposed. The two core indicators are the preservation of fragrance and quality and uniform moisture processing. The key points and difficulties that need to be overcome. Aroma preservation processing refers to the preservation of the aroma components inside the tobacco to the greatest extent, to avoid causing industrial processing to reduce the positive quality of raw materials and reduce the industrial availability of raw materials; the homogenization processing of tobacco leaves includes the homogenization control of moisture and chemica...

AI Technical Summary

Problems solved by technology

However, the vacuum moisture resurfacing process can also easily lead to excessive moisture content of the tobacco leaves on the surface of the bale, and even water-stained smoke and steamed tobacco, which make part of the pressed oily smoke stand out. , resulting in two levels of moisture content differentiation, the subsequent processing equipment inlet moisture coefficient of variation is large, the processing effect is not ideal, restricting the level of homogenization processing

In addition, there are still the following problems in the existing vacuum moisture resurgence processing technology: ① In order to maintain the looseness of the tobacco leaves after moisture resurgence, prevent cake formation of tobacco leaves and subsequent processing of crushing, it is carried out with a permeability ≥ 98% and a core temperature of 60-75°C. control, but at the same time it is easy to produce water-stained tobacco and steamed tobacco, and the moisture content of the same batch of tobacco leaves is even more uneven, which restricts the homogenization effect of subsequent processing

② Under the high-intensity vacuum moisture treatment, the secondary evacuation is carried out, so that the tobacco leaves stay for a long time under high temperature and high humidity, and the sensory quality of the tobacco leaves deteriorates

③The color of tobacco leaves becomes darker after vacuum moisture resurgence processing, and the quality declines

④Blindly reducing the intensity of vacuum resurfacing processing will lead to insufficient looseness of the tobacco leaves, low leaf penetration rate, caked tobacco leaves, making it difficult to select, affecting the efficiency of leaf laying and causing waste in subsequent processing, etc.

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