JPS6221507B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for separating soil and sand in a sheet tobacco manufacturing process. In the manufacturing process of sheet cigarettes, the raw materials used are fine tobacco powder, which is the waste produced during the tobacco manufacturing process, or fine tobacco powder, which is made by finely chopping and blending dozens of types of leaf tobacco with different leaf positions. However, all of them are contaminated with dirt and sand that adhered to the original leaf tobacco, and for this reason, in order to prevent wear on the equipment during the crushing and molding processes, and to maintain a constant product quality, these processes have been changed. Before this process, a separation process is installed to separate dirt and sand mixed into the fine tobacco powder, which is the raw material. In the conventional separation process, multiple sieves with different sieve meshes are used, and the first sieve with larger sieve meshes is used to sieve, and then the fine tobacco powder below the sieve mesh is sieved through the second sieve with smaller sieve meshes. Separate. However, if the particle sizes of fine tobacco powder and sand and the like do not differ much, it is not possible to separate the fine tobacco powder and sand and the like using a sieve. If the particle size of the dirt, etc. is smaller than the gap between the forming rolls in the forming process (approximately 0.1 mm), the forming rolls will not be damaged, and there is no need to crush the forming rolls in the crushing process, and a certain amount of the earth and sand will be removed. However, if the particle size is close to the gap between the forming rolls, there is a problem of damaging the forming rolls. The present invention has been made in view of the above circumstances, and its purpose is to provide a method for separating soil and sand in the sheet tobacco manufacturing process, which separates soil and the like from fine tobacco powder so as to prevent troubles from occurring during the crushing and molding processes. It is to provide. In order to achieve the above object, the present invention sieves fine tobacco powder mixed with earth and sand, etc., sends the sieved fine tobacco powder under the sieve to a fluidized bed, and in the fluidized bed, a gas flow is generated. The fine tobacco powder is scattered by the fluidized bed, and the remaining tobacco fine powder that is not scattered in the fluidized bed is sent to a rotary separator, and the rotary separator uses centrifugal force and centripetal force to separate the fine tobacco powder from earth and sand. It is characterized by An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an overview of the entire sheet tobacco manufacturing process employing the soil separation method of the present invention. In the figure, code 1 is the soil separation process, 2 and 3 are the crushing process, and 4
5 is a blending process, 5 is a molding process, 6 is a drying process, and 7 is a cutting process. The raw materials used are fine tobacco powder, which is waste produced during the tobacco manufacturing process, or fine tobacco powder, which is made by finely chopping and blending dozens of types of leaf tobacco with different leaf attachment positions. The fine tobacco powder is first separated from sand and the like in a sand separation step 1, and then pulverized in a pulverization step 2. In this pulverization process 2, the powder additives pulverized in the pulverization process 3, that is, cellulose derivatives and various natural gums as binders, and fibrous substances for imparting fracture resistance, are pulverized and mixed into a uniform powder. It becomes a mixture. The powder mixture is sent to blending step 4, where various di-aldehydes as wet strength agents are dissolved in water and added together with various glycols and sorbitols as plasticizers and fragrances to form a uniformly moist powder and granules. Become. The wet powder having a moisture content ranging from 10% to 80% is sent to a forming step 5 where it is continuously rolled by two rolls into a sheet and peeled off from the rolls by a toggle knife. The sheet-shaped tobacco peeled from the roll is conditioned to have a moisture content of 8 to 15% in a drying step 6, and then cut to a predetermined size in a cutting step 7. The above is an overview of the sheet cigarette manufacturing process. Next, the soil separation step 1 will be explained in detail. The fine tobacco powder is first sent to a sieve 8 with a mesh size of 0.3 mm to be sieved. Fine tobacco powder of 0.3 mm or more is sent to the crushing process 2. Only a small amount of earth and sand is mixed into this fine tobacco powder, and it is crushed in the crushing step 2. As shown in FIG. 2, the fine tobacco powder under the sieve (which contains more soil and sand than the fine tobacco powder above the sieve) with a size of 0.3 mm or less is sent to the vibrating fluidized bed 10 by a quantitative feeder 9. The vibrating fluidized bed 10 is inclined so that the inlet side 10a is high and the outlet side 10b is low.
From step 2, the air is blown at a speed of 20 cm/sec from the air outlet surface to scatter fine tobacco powder. The fine tobacco powder scattered by the air is sent to the cyclone 13 and separated from the air, and then sent to the crushing step 2. This fine tobacco powder contains dirt and the like whose particle size is small enough to be blown up by the air flow (smaller than the gap between the forming rolls), but this is not a problem as described above. The fine tobacco powder remaining in the vibrating fluidized bed 10 without being scattered contains a lot of dirt, etc., and the particle size of the dirt, etc. mixed in here is often close to the gap between the forming rolls. . This fine tobacco powder is sent to the rotary separator 14, where it is separated into fine tobacco powder, dirt, etc. using centrifugal force and centripetal force. In addition, 26 in FIG. 2 is an air locker (rotary valve). 3 to 6 show this rotary separator 14 in detail. An input port 16 is provided in the upper part of the cylindrical main body 15, and the above-mentioned fine tobacco powder inputted from the input port 16 is transferred to the main body 15 by a raw material dispersion plate 17 provided at a position almost directly below the input port 16. distributed within the space within. Substantially conical separating plates 18 are provided below the raw material distribution plate 17 at appropriate intervals. The slope 18a of the separation plate 18 has an inclination angle θ of about 3°. A raw material falling port 19 is provided in the center of the separating plate 18, and a dirt falling gap 20 of about 2 to 3 mm is provided between the peripheral edge of the separating plate 18 and the peripheral wall of the main body 15. A rotating device 21 that rotationally drives the main body 15 is composed of a crank-shaped drive shaft 22 and a motor (not shown) that applies a driving force to the drive shaft 22.
The drive shaft 22 is connected to the center axis of the bottom side of the main body 1 (main body 1
5) is shifted by a distance d from the central axis _l2 on the side where the pulley ₂₃ is provided. When the drive shaft 21 is driven by the motor to rotate the main body 15 (approximately 250 rpm), this rotational movement
As shown in the figure, the rotational movement diameter is 2d (about 25mm),
It revolves around the outer circumference 2d+D (D is the diameter of the main body 15). Therefore, the fine tobacco powder that has fallen onto the separating plate 18 is subjected to the centrifugal force and centripetal force caused by the rotational movement, and the earth and sand with a high specific gravity are gathered to the periphery of the separating plate 18 along the slope 18a, The fine tobacco powder is gathered toward the center along the slope 18a. Sediment, etc. gathered on the periphery side is placed in the sediment fall gap 20.
The fine tobacco powder collected at the center falls from the raw material drop port 19 and is taken out from the outlet 25. Although the fine tobacco powder taken out from the outlet 25 contains some dirt, sand, etc., this dirt, etc. is attracted to the center side of the separating plate 18 by centripetal force, and its particle size is smaller than that between the forming rolls. It is smaller than the gap and there is no problem. Sediment, etc. with a particle size near the gap is drawn to the periphery of the separation plate 18 by centrifugal force, so
It does not appear to be mixed into this fine tobacco powder. This fine tobacco powder is sent to the crushing step 2. Although some fine tobacco powder is mixed in the earth and sand discharged from the discharge port 24, this is discarded. In this way, fine tobacco powder of 0.3 mm or more contains a small amount of dirt, etc., but this is removed during the crushing process.
Tobacco fine powder crushed by the vibrating fluidized bed 10 and scattered by the air flow in the rotary separator 14
The particle size of the dirt, etc. mixed into the fine tobacco powder separated in the process is smaller than the gap between the forming rolls, so the crusher used in the crushing process 2 needs to have a smaller capacity than conventional ones, and the forming rolls can be There is no risk of damage, and the separation efficiency of dirt, etc. is excellent. When the soil and other substances were separated from the fine powder of native and yellow tobacco using the above-mentioned method of separating tobacco, the results shown in the following table were obtained.

[Table] As is clear from the table above, the cigarette collection rate is
This was a significant improvement of over 95%. As explained above, according to the present invention, separation means using a sieve, separation means using a fluidized bed, and separation means using rotational separation using centrifugal force and centripetal force are combined, and separation is first performed using a sieve, and then separation is performed using a fluidized bed. separate,
Since the material is then separated using a rotary separator, the soil and sand separation efficiency is high, the burden on the crushing process is small, and the forming rolls are not damaged.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a schematic diagram of the entire sheet cigarette manufacturing process, Fig. 2 is a block diagram showing the separation process in detail, and Figs. 3 to 6 are a rotary separator. 3 is an overall sectional view, FIG. 4 is an enlarged sectional view of the rotating device, FIG. 5 is a cross-sectional view of the main body, and FIG. 6 is an explanatory diagram explaining the rotational movement. be. 8...Sieve, 10...Fluidized bed, 14...Rotary separator.

Claims (1)

[Claims] 1. Fine tobacco powder mixed with earth and sand etc. is sieved with a sieve, and then the sieved fine tobacco powder under the sieve is sent to a fluidized bed, where the fine tobacco powder is scattered by a gas flow, and then A sheet cigarette manufacturing method characterized in that fine tobacco powder remaining without being scattered in a fluidized bed is sent to a rotary separator, and the rotary separator separates the fine tobacco powder from sand etc. using centrifugal force and centripetal force. Sediment separation method in process.