Method for efficiently separating cut stems from cut tobacco

Abstract

The invention relates to a method for efficiently separating cut stems from cut tobaccos, which efficiently separates the cut stems from the cut tobaccos through the combination of screening and winnowing processes, and effectively avoids cut stem residues, and comprises the following specific steps: 1) firstly screening incoming cut tobaccos to obtain long cut tobaccos and short cut tobaccos; (2) winnowing the screened filaments through a horizontal winnowing machine; (3) the screened short shreds do not pass through a horizontal winnowing machine and directly enter a vertical winnowing machine for winnowing, the vertical winnowing machine adopts an ascending air flow mode, light short shreds are conveyed to a fluidized bed, and heavy cut stems are separated and collected through a channel below the vertical winnowing machine; and 4) mixing treatment: mixing the tobacco shreds separated by the horizontal winnowing machine and the vertical winnowing machine to serve as qualified products to enter the next process. Through the process method, the cut stems in the tobacco shreds can be efficiently removed, the purity of the tobacco shreds is improved, and the requirements of follow-up procedures for raw materials are met.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco processing, and in particular to a method for efficiently separating shredded tobacco from stems, which can effectively improve the purity and quality of shredded tobacco and enhance the production efficiency of tobacco processing. Background of the Invention During tobacco processing, tobacco shreds often contain a certain amount of stems. The stems are hard and dense. If they are not effectively removed, they will affect the quality of subsequent products and reduce production efficiency. The existing separation method mainly uses the air separation process, that is, all the tobacco to be selected undergoes a first air separation (horizontal air separator) and a second air separation (vertical air separator). However, in actual applications, there is a problem that short shreds and stems of similar sizes cannot be effectively separated, and stems often remain, affecting the separation effect. In actual production, the production efficiency of the subsequent rolling process is often reduced due to the inability to effectively remove the stems. There is also a problem of tobacco waste caused by the pursuit of a stronger separation ratio, which increases production costs.

[0002] Therefore, how to more effectively separate the stems from the shredded tobacco, especially to solve the separation problem when the short shreds and stems are close in size, is an urgent problem to be solved in tobacco processing technology.

[0003] The patent application (application number CN201110006915.X) discloses a method for constant temperature flexible air separation after air drying of leaf shreds, which uses the high enthalpy process waste gas discharged from the air drying and dehumidification system of leaf shreds to increase the temperature of the fresh air at the inlet of the flexible air separator, thereby increasing the temperature of the fresh air of the leaf shreds air separator, reducing the temperature difference, and reducing the impact of excessive cooling of the leaf shreds on the quality of the leaf shreds, thus saving energy. The invention does not involve a method for secondary air separation of the air separator.

[0004] The patent application (application number CN201811438445.2) discloses a flexible air separation processing device for thin tobacco shreds and its processing technology. It specifically targets the processing of thin cigarettes and adopts a three-level air separation method to solve the problems of uneven feeding of shredded tobacco leaves and agglomeration in the first-level flexible air separation, high tobacco content in stems and large amount of ribbon stems removed in the second-level flexible air separation. The invention requires multiple air separation equipment, which loosens the tobacco shreds through loosening rollers after the feeding vibration trough of the first-level air separation. The tobacco shreds enter the loosening rollers without distinction, and no screening of the tobacco shreds is involved. Summary of the invention

[0005] The purpose of the present invention is to provide a method for efficiently separating stems from shredded tobacco based on the above-mentioned prior art conditions. The method can efficiently separate stems from shredded tobacco and effectively avoid residual stems through a combination of screening and air separation processes, thereby improving the purity and production efficiency of shredded tobacco.

[0006] The technical solution of the present invention is as follows: Incoming material screening: First, the incoming tobacco is screened to obtain long filaments and short filaments. Since the size of short filaments and stem filaments is similar, the short filaments usually contain most of the stem filaments. A small amount of stem filaments remain in the long filaments.

[0007] Separating stems from filaments: The filaments after screening are passed through a horizontal air separator for air separation. By adjusting the wind force, the lighter shreds will be separated by air separation, and the heavier stems will be collected.

[0008] Separation of stems from short fibers: After screening, the short fibers do not pass through the horizontal air separator, but directly enter the vertical air separator. The vertical air separator uses an ascending airflow method, and the lighter short fibers are sent to the fluidized bed, while the heavier stems are separated and collected through the lower channel.

[0009] Mixing process: The tobacco separated by the horizontal air separator and the vertical air separator will be mixed and enter the next process as qualified products.

[0010] Second separation: For the shredded stems separated by the horizontal air separator, if they contain more shredded tobacco, they can be sent to the vertical air separator system for further separation to improve the utilization rate of shredded tobacco.

[0011] By combining and improving the above existing processes, the present invention can efficiently remove stems from shredded tobacco, improve the purity of shredded tobacco, and meet the requirements of subsequent processes for raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : Flow chart of the method for efficiently separating stem shreds from shredded tobacco according to the present invention. DETAILED DESCRIPTION

[0013] Embodiment 1: (I) A cigarette brand A was dried and then air-selected. Before air-selection, a tobacco sample was taken for purity measurement. The purity was 94.2%, i.e., the proportion of tobacco stems was 5.8%.

[0014] (II) After drying, the material is conveyed to the sieve plate by a belt conveyor, and the filaments with stems above the sieve plate enter the primary air separation equipment for air separation. The purity of the filaments with stems before air separation is 96.2%, that is, the proportion of filaments containing filaments is 3.8%. The purity of the filaments after air separation is 98.5%, that is, the proportion of filaments containing filaments is 1.5%, and the proportion of silk in filaments is 12%.

[0015] (III) The screened materials from the first wind selection are mixed with the short silk containing stems under the sieve plate and enter the second wind selection. The purity of the short silk containing stems before wind selection is 86.2%, that is, the proportion of stems in the silk is 13.8%. The purity of the short silk after wind selection is 93.5%, that is, the proportion of stems in the silk is 6.5%, and the proportion of silk in stems is 8%.

[0016] (iv) The long filaments are mixed with the short filaments, and the purity of the mixed shredded tobacco is 97.5%, that is, the proportion of the filaments in the shreds is 2.5%, and the proportion of the shreds in the shreds is 8%.

[0017] The same brand of tobacco is selected by wind selection through the existing process (that is, all tobacco is firstly air-selected in the horizontal air-selector, and the tobacco selected in the horizontal air-selector is then air-selected in the vertical air-selector for the second time). The purity of the tobacco after air selection is 96.5%, that is, the proportion of tobacco in tobacco is 3.5%, and the proportion of tobacco in tobacco is 8.5%. In comparison, the proportion of tobacco in tobacco and tobacco in tobacco with the improved process has decreased.

Claims

1. A method for efficiently separating stems from shredded tobacco, characterized in that: Through the combination of screening and air separation, the stems in the tobacco are separated to improve the purity of the tobacco. The specific process steps are as follows: 1) Incoming material screening: First, the incoming tobacco is screened to obtain long filaments and short filaments. Since the size of short filaments and stem filaments is similar, the short filaments usually contain most of the stem filaments, and a small amount of stem filaments remain in the long filaments; 2) Separation of stems from filaments: The filaments after screening are passed through a horizontal air separator for air separation. By adjusting the wind force, the lighter tobacco shreds will be separated by air separation, and the heavier stems will be collected; 3) Separation of stems from short fibers: The short fibers after screening do not pass through the horizontal air separator, but directly enter the vertical air separator for air separation. The vertical air separator adopts the method of rising airflow. The lighter short fibers are sent to the fluidized bed, and the heavier stems are separated and collected through the lower channel; 4) Mixing process: The tobacco separated by the horizontal air separator and the vertical air separator are mixed and enter the next process as qualified products.

2. The method for efficiently separating shredded tobacco from shredded tobacco according to claim 1, characterized in that: For the shredded tobacco separated by the horizontal air separator, if it contains a large amount of shredded tobacco, it can be sent to the vertical air separator system for further separation.

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