JPS6140777A - Earth and sand separation in sheet tobacco producing process - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 are either fine tobacco powder, which is the waste poured out during the tobacco manufacturing process, or fine tobacco powder, which is made by chopping and blending dozens of types of leaf tobacco with different leaf positions. However, all of them are contaminated with dirt, etc. that adhered to the original leaf tobacco, so the purpose is to prevent wear of the equipment during the crushing and molding processes, and to maintain a constant product quality. Before these steps, a separation step is carried out 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 mesh sizes are used.
First, the tobacco is sieved using a first sieve with a large sieve size, and then the fine tobacco powder below the sieve size is sieved using a second sieve with a small sieve size.

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.

When the particle size of the earth and sand is smaller than the gap between the forming rolls in the forming process (approximately 0.1 crane), the forming rolls will not be damaged, and there is no need to crush them in the crushing process. Although there is no problem with the inclusion of a certain amount of earth and sand because it helps to reduce the tar content, there is a problem of damaging the forming rolls if the particle size is close to the gap between 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.

Figure 1 shows an overview of the entire sheet tobacco manufacturing process employing the sand separation method of the present invention. Step 6 is a drying step, and 7 is a cutting step.

The raw material used is fine tobacco powder, which is the waste poured out 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 young leaf 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 crushing step 2,
The powder additives pulverized in the pulverization step 3, that is, cellulose derivatives and various natural gums as binders, and fibrous materials for imparting fracture resistance, are pulverized and mixed to form a uniform powder mixture.

The powder mixture is sent to compounding step 4, where various di-aldehydes as wet strength agents are added to water along with various glycols and turpinto as plasticizers and fragrances. It is added at 8WI to form a uniformly wet powder.

Wet powder with a moisture content of 10% to 80% is formed in the molding step 5.
There, it is continuously rolled by two rolls to form a sheet and peeled off from the rolls by a thorn 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 into predetermined sizes in a cutting step 7.

The above is an overview of the sheet tobacco manufacturing process, and the soil separation process 1 will be explained in detail. Tobacco fine powder is first sieved to 0
．． It is sent to Wa8 of 3fi and is screened.

Fine tobacco powder of 0.3fi or more is sent to the crushing step 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 of 0.3 m or less (containing more soil, etc. than the fine tobacco powder above the sieve) is fed to the moving fluidized bed 1 by the quantitative feeder 9, as shown in Fig. 2.
Sent to 0.

The oscillating flow fftlo is inclined so that the inlet side 110a is high and the outlet side 10b is low, and the air from the blower 11 is blown at a wind speed of 20 cm/m on the air outlet surface through the mesh rectifier plate 12 while the whole body vibrates. Sprinkle 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 rotating 1iIt machine 14, where it is separated into fine tobacco powder, dirt, etc. using centrifugal force and centripetal force. Note that 4 in Figure 2 is an air locker (rotary valve).

3 to 6 show this rotary separator 14 in detail. A cylindrical main body 15 is provided with an input port 16 in the upper part, and the above-mentioned tobacco fines are inputted from the input port 16. The powder is transferred to the raw material dispersion plate 1 located almost directly below the input port 16.
7 to be distributed within the space within the main body 15.

Substantially conical separating plates 18 are provided below the raw material distribution plate 17 at appropriate intervals. The slope 18a of this 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 two to three holes are provided between the peripheral edge of the separating plate 18 and the peripheral wall of the main body 15.
An earth and sand fall gap 2-0 is provided.

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.

In the drive shaft 22, the center axis on the bottom side of the main body 1 (coinciding with the center axis 11 of the main body 15) is shifted by a distance d from the center axis 12 on the side where the pulley 23 is provided. Drive shaft 2I by motor
When the main body I5 is rotated (approximately 250 rpm+) by driving the main body I5, as shown in FIG. It will revolve.

Therefore, the fine tobacco powder that has fallen onto the separating plate 1B is subjected to the centrifugal force and centripetal force caused by the above-mentioned 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.

The earth and sand collected on the periphery side fall through the earth and sand falling gap 2° and are discharged from the discharge port 24, and the tobacco fine powder collected on the center side falls from the raw material fall port 19 and is taken out from the take-out port 25. Ru.

Although the fine tobacco powder taken out from the outlet 25 contains some dirt and sand, this dirt is attracted to the center of the separation plate 18 by the centripetal force, and its particle size is smaller than that between the forming rolls. Sediment, etc. with a particle size near the 8-gap, which is smaller than the gap and poses no problem, is brought to the periphery of the separation plate 18 by centrifugal force, so that there is no such thing as being mixed in with this tobacco fine powder. The powder is sent to grinding step 2. Although some fine tobacco powder is mixed in the earth and sand discharged from the discharge port 24, this is discarded.

As described above, fine tobacco powder of 0.3 fi or more contains a small amount of dirt, etc., but this is crushed in the crushing step 2, and the tobacco fine powder is scattered by the air flow in the vibrating fluidized bed 10. The particle size of the dust and dirt mixed in the fine tobacco powder separated by the rotary separator 14 is smaller than the gap between the forming rolls, so the capacity of the crusher used in crushing process 2 is smaller than conventional ones. Also, there is no risk of damaging the forming rolls, and the separation efficiency of dirt, etc. is excellent.

When the soil and other substances were separated from fine powder of native and yellow tobacco using the above-mentioned method of separating tobacco, the results shown in the following table were obtained.

Electricity The upper row of each item is based on the original raw material as 100.

〃 The lower row shows the soil content (%). Therefore, the product of the two represents the amount of earth and sand, and the other represents the amount of tobacco.

x2 Separation results are the result of discarding the earth and sand from the discharge port 24 of the rotary separator.

East 8 Comparative example did not use a rotary separator, and the remaining portion of the fluidized bed was discarded to show the separation results.

As is clear from the table above, the cigarette recovery rate was significantly improved to 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. Since it is separated and then separated using a rotary separator, the soil and sand separation efficiency is high, and the burden on the crushing process is small (and the forming rolls are not damaged).

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic diagram of the entire sheet cigarette manufacturing process, Fig. 2 is a configuration diagram showing the separation process in detail, and Figs. 3 to 6 are diagrams showing the rotation amount δU. The machine is shown in detail, with Fig. 3 being an overall sectional view, Fig. 4 being an enlarged sectional view of the rotating device, Fig. 5 being a cross-sectional view of the main body, and Fig. 6 being an explanatory diagram explaining the rotational movement. It is. 8... Sieve, 10... Fluidized bed, 14... Rotary separator. Patent applicant: Japan Exclusive Public Corporation designated agent: Nakayama, Director of Research and Development, Japan Exclusive Public Corporation
Michi Husband

Claims (1)

[Claims] Fine tobacco powder mixed with earth and sand is separated by 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 process characterized by sending the fine tobacco powder remaining without being scattered in the layer to a rotary separator, and separating it into sand, etc. and fine tobacco powder using centrifugal force and centripetal force in the rotary separator. Sediment separation method.