JPS6287046A - Apparatus for heat-treatment of tea leaf - Google Patents

Abstract

PURPOSE:To enable rapid heat-treatment of tea leaves in high efficiency without necessitating a steam-generation means or hot iron plate, by providing a perforated horizontal rotary drum and projecting flame of a flame-projector type gas burner toward a buffle plate at the center of the rotary drum while supplying tea leaves from an opening into the drum. CONSTITUTION:The inclination angle of a rotary drum 1 is adjusted according to the nature of raw tea leaves. The rotary drum 2 is rotated, a flame-projector- type gas burner 7 is adjusted to extend the flame to a buffle plate 15 and a part of combustion gas is intruded between the rotary drum 1 and a cover 20. Raw tea leaves are continuously supplied to an end of the rotary drum 1 by a screw conveyor 6 and the heat-treated leaves are discharged from the other end and collected. Since the raw tea leaves are treated in an oxygen-free state, the product keeps bright green color and has improved gloss.

Description

[Detailed Description of the Invention] 1) Industrial Application Field This invention is aimed at efficiently heat-treating fresh tea leaves, withered tea leaves, and tea leaves that have undergone some degree of fermentation to stop the activity of their oxidizing enzymes. , relates to a tea leaf heat treatment device for preventing or stopping the fermentation of green tea leaves or tea leaves.

2) Prior Art Tea steamers and leaf roasters are known as means for heating fresh tea leaves and tea leaves to prevent or stop their fermentation.

The majority of Japanese green tea is heat-treated in tea steamers, but this has evened out the flavor of green tea, which has also caused a stagnation in consumption.

By the way, a tea steamer stirs fresh tea leaves at about 100° C. with about 300% steam per 1 kq of fresh tea leaves and steams them for 30 to 120 seconds.

A tea leaf roasting machine heats a body made of a thick iron plate to about 250 to 400''C, and heats it by throwing fresh tea leaves or tea leaves into it and roasting them.

3) Problems to be Solved by the Invention The above-mentioned tea steamer requires generation of steam, and the efficiency of heating by the steam is not good, resulting in high equipment and fuel costs. The tea leaves become soft again, and a
! Cleaning the machine is difficult.

In addition, with a confectionery machine, there is a significant difference in quality between the tea leaves that have touched the iron plate and those that have not, and the tea leaves tend to become uneven when heated, thus preventing or stopping fermentation depending on the part of the tea leaves. I'm afraid I won't be able to do it. In addition, in order to bring the tea leaves into good contact with the iron plate, it is necessary to reduce the amount of input, resulting in a small amount of processing.

The present invention provides a tea leaf heat treatment device that eliminates the drawbacks of the conventional means and improves the quality of tea! The purpose is to provide %.

4) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention includes a rotary drum made of a perforated plate, which is cylindrical and horizontally hung so as to be freely rotatable, and a rotary drum mounted approximately in the center of the rotary drum. a baffle plate, a tea leaf supply means facing one opening of the rotary cylinder, a flame-throwing gas burner mounted adjacent to the tea leaf supply means and facing the baffle plate; It consists of an inclination adjustment means for adjusting the inclination angle of the cylinder, and a cover that covers most of the rotary cylinder.

5) Operation FIG. 1 shows an embodiment of the present invention, and the present invention will be explained in detail with reference to the drawings.

In the drawing, (1) is a cylindrical rotary cylinder with many small holes. In the example, the diameter of the small hole is 3 medium, and the rotating body (1)
The diameter was 580 mm, and the medium length was 2 mm. This rotary cylinder (1) is horizontally suspended by rollers (4) and (5) of a machine frame (2) so as to be freely rotatable. In addition, on the inner surface of the rotary cylinder (1), there is a crosspiece (8
) has been established.

A tea leaf supply means (6) consisting of a screw conveyor is disposed in one opening (30) of the rotary barrel (1), with its terminal end facing into the opening (30). Further, a gas gun type burner (7), which is one of the flame radiation type gas burners, is arranged in this opening (30) adjacent to this screw conveyor (6). In the example, up to 150
It was designed to burn 0,000 kilocalories.

A support arm (10) whose center is a threaded bearing (12) is fixed near the other end of the center of the rotating body (1), and a support arm (10) whose center is a threaded bearing (12) is fixed at the rear end. The supporting arm (I+)% is fixed. Between these bearings, a thread is cut in approximately half of one of the bearings (12) to be screwed into the bearing (12), a circular baffle plate (15) is fixed to the end, and a rotating handle (16) is fixed to the other half of the center. Attach the shaft (17). Then, by rotating the handle (16) forward and backward, the bearing (12)
) are fixed, the central shaft (17) and baffle plate (15) move back and forth along the rotating drum (1).

Also, the gun type burner (7) is connected to this baffle plate (15).
). Incidentally, the size of the baffle plate (15) is set to about % to % of the inner diameter of the rotary drum (1). In the example, it was set to 330φ.

(20) is an exhaust cover in which most of the rotary shell (1) is fixed to the covered machine frame (2). Mouth (2+)! Form. (2
2) are several thermometers that display the temperature inside the cover.

A lower machine frame (25) is directed below the machine frame (2), the other end is a pivot support (26) L/, and a lifting means (27) such as an automobile jack is interposed at one end. It constitutes an inclination angle adjusting means (24) for the rotary drum (1). Then, by vertically adjusting the elevating means (27), the inclination angle of the machine frame (2) and the rotary cylinder (1) horizontally suspended on the machine frame (2) will change around the pivot point (26). do. When the elevating means (27) is lowered to its lowest position, the rotary cylinder (1) is made horizontal.

(29) is a motor that rotates the rotating drum (1) by driving the roller (4). Although not shown, the rotary drum (1) is changed in speed within a range of 15 to 25 rpm by a speed change means such as a speed change lever or an inverter.

Therefore, we will next discuss the case of heat treating raw tea leaves.

First, adjust the inclination angle of the rotary cylinder (1) according to the green tea leaves. The residence time, that is, the heating time, of the tea leaves placed in the rotary barrel (1) is changed mainly by adjusting the inclination angle between about 0 and 5 degrees. For example, if it is a bud with a lot of moisture, the amount of heat 8 will be large, and the leaf temperature will not rise, and it will be difficult to heat-treat. Slope. On the other hand, sclerophytes with low moisture content can be used for a short period of time, e.g.
Since it is necessary to hold the water for about 0 to 40 seconds, the inclination of the rotary cylinder (1) is made slightly steeper. Therefore, the elevating means (27) is adjusted according to the fresh tea leaves, and the inclination angle of the rotary drum (1) is adjusted. To check the residence time, several pieces of raw tea cloth are placed in the green tea leaves that are continuously supplied to the rotary drum (1), and the average value of their residence times is determined.

Next, the zero rotation direction in which the rotary drum (1) is rotated is the second direction.
As shown in the figure, the direction is such that the green tea leaves are stirred and fall away from the flame of the 11-gun type burner (7). In addition, the rotating body (
By changing the rotation speed in step 1), you can adjust the degree of stirring of the green tea leaves and the falling height, so depending on the size of the green tea leaves, you can adjust the rotation speed so that the green tea leaves come into direct contact with the flame and are well stirred. It is better to change the rotation speed.

Then, ignite the gunfire burner (7) M. The combustion amount of the gunshot burner (7) is adjusted so that the visible tip of the flame reaches the baffle plate (15). Then,
Combustion gas of about 600 to 800 degrees Celsius due to flame radiation bounces off the baffle plate (I5), creating a high temperature atmosphere a in the part of the rotary cylinder (1) on the input side from the baffle plate (15).
The momentum of the flame passes through the gap between the rotary cylinder (1) and the baffle plate (15), flows to the other end of the rotary cylinder (1), and flows from the baffle plate (15) to the extraction side. A high temperature atmosphere is created and then exhausted from the outlet (31) at the other end. Of course, since the rotary shell (1) is formed of a perforated plate, some of the combustion gas passes through and enters between the rotary shell (1) and the cover (20). is discharged through the other end exhaust port (21) while keeping it warm.

By the way, if a baffle plate (32) is attached to the other end of the rotating body (1), the above atmosphere will be kept at a higher temperature than that, increasing the heating effect of the green tea leaves. When moving, the range of the high-temperature atmosphere a changes as shown in Figure 4. For example, when processing green tea leaves that are difficult to heat, move the baffle plate ((5) forward to widen the high-temperature atmosphere a, so that the green tea leaves are Allow it to heat up more.

Therefore, the rotary cylinder (1) was
Continuously feed fresh tea leaves little by little to one end of the tube. The introduced green tea leaves are rotated by the rotational stirring action of the rotary cylinder (1) and move toward the other end according to the inclination angle (according to this), but they quickly reach the high temperature atmosphere a and are scattered in the high temperature combustion gas. When the product is heated, its temperature rapidly rises to over 80°C.

The green tea leaves must be heated until they pass the baffle plate (15).
In 20 to 40% of all cases, the atmosphere is heated to a high temperature, then moves into the atmosphere (high temperature T2t), and the temperature drops slightly, or it continues to be heated, and the other end of the rotary cylinder (1) is heated to a high temperature (T2t). 31) and is taken out. The temperature of the tea leaves when taken out is approximately 70°C.

The temperature of fresh tea leaves is 70-80 for 20-30 seconds or more.
If the temperature is kept above ℃, the activity of oxidative enzymes in the leaves will stop, and the green tea leaves will not ferment. At the same time, the raw tea leaves are heated with a gas flame, which softens the tea leaves while keeping their bright green color, making them easier to knead and shape in the next process, and the essential oil components ooze out onto the surface of the leaves. Perhaps because of this, the surface of the leaves becomes more shiny. In addition, during the process, the leaves are not damaged or broken, and the shape of the leaves is not obscured, so the leaves do not have a dominant fishy odor, which increases the product value of the tea.

By the way, if the crosspiece (8) is installed inside the rotating body (1), the rotation of the nine-tea fresh fruit will be greatly improved, but it should not come into direct contact with the flame of the gun-type burner (7). In addition, for this purpose, the installation position of the gun type burner (7) must be
As shown in FIG. 2, it is preferable to shift it from the center of the rotary cylinder (1).

During the process, the tea leaves are taken out little by little from the outlet (31) at the other end of the rotary barrel (1), and each leaf is exposed to high-temperature hot air. Because the heat penetrates well into the inside of the leaf,
It has been heat-treated evenly and is of high quality, with a bright color and a good shine.

In addition, during the process, the tea leaves are heated to high temperatures, causing a fishy odor.
Some of the gases evaporate, but since they are discharged through small holes on the circumference of the rotary cylinder (1), the drying progresses a little and the fishy odor becomes light.

6) Effects This invention does not require a steam generating means such as a boiler like a tea steamer, and does not indirectly heat raw tea leaves by heating a thick iron plate to a high temperature like a tea steamer. Since the high-temperature combustion gas of the flame-throwing type gas burner is brought into direct contact with the fresh leaves, equipment costs and fuel costs are significantly reduced.

In addition, in this invention, a flame-throwing type gas burner is directed to the baffle plate (15) which is mounted concentrically in the approximate center of the rotating body (1), and the baffle plate (15) The high-temperature atmospheres A and I are set as boundaries, and the fresh tea leaves are moved from one side to the other in the rotary cylinder (1) while being well rotated and stirred, so that each fresh tea leaf is The quality of the heat-treated leaves is significantly improved because the tea leaves are heated rapidly, efficiently, uniformly, and processed in large quantities, and in particular, the tea leaves retain their bright green color and gain shine.

Furthermore, since the heating time of the green tea leaves can be easily changed by adjusting the inclination angle of the rotary cylinder (+), the heat treatment can be changed depending on the quality of the green tea leaves or the desired tea quality. Furthermore, since the green tea leaves are heated with combustion gas, the green tea leaves are in this closed oxygen-free state, and even if the green tea leaves are slightly damaged, oxidation does not proceed from there, and in this respect, the tea leaves are Improve quality.

In addition, if the position of the baffle plate (15) in the rotary cylinder (1) can be changed by 100, the high temperature atmosphere in the rotary cylinder (1) will change between a and 4! The volume ratio of the high-temperature atmosphere to the tea leaves can be changed, so the atmosphere can be adjusted depending on the quality of the fresh tea leaves, for example, expanding the high-temperature atmosphere a because the tea leaves with a high moisture content need to be heated to a higher temperature. can be changed to improve heat treatment.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention - ゛ The partially cutaway front view, Figs.
The line cross-sectional view, Figure 4 is a diagram showing the increase and decrease of the high temperature atmosphere area a, and #
↓##Unimo; (1)...Rotating barrel (6)...Screw conveyor (7)...Gun type burner (15)...Baffle plate (24)...Inclination angle adjustment means Manual adjustment Written (method) February 18, 1986

Claims (2)

[Claims] (1) A rotating cylinder made of a perforated plate that is cylindrical and rotatably suspended horizontally, a baffle plate installed approximately in the center of the rotating cylinder, and a tea leaf supply with its end facing one opening of the rotating cylinder. a flame-throwing type gas burner mounted adjacent to the tea leaf supplying means and facing the baffle plate; an inclination adjustment means for adjusting the inclination angle of the rotating barrel; and a cover covering most of the rotating barrel. A tea leaf heat treatment device consisting of (2) The tea leaf heat treatment apparatus according to claim 1, wherein the baffle plate is movable back and forth along the rotary drum.