JP2000093143A - Tea leaf-heating and processing device and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for heating and processing tea leaves, reducing a smoking and capable of producing high quality tea leaves excellent in its color, aroma and taste alike, and a method thereof. SOLUTION: This device for heating and processing tea leaves is provided by collecting air of an elevated temperature at the inside and outside of a rotary drum 2 by heating with a heating means 3 installed as facing each other at the lower side of the rotary drum 2 at the air collecting part 16 in a outer casing body 6 of the rotary drum 2, sending out the heated air to an air blowing means 7 arranged in the rotary drum 2 by a driving means 8, sending it by a compression with the air blowing means 7 to a blowing out base tube 18 mounted at the blowing out side of the driving means 8 and facing to the inside of the rotary drum 2, and sending out the heated air in the vicinity of the layer of piled tea leaves being transferred toward the product taking out port 5 along the inside wall of the rotary drum from blowing holes 21 installed at the tip part of multiply and intermittently branched blowing tubes of the base blowing tube 18 for directly blowing the hot air against the raw tea leaves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for heating tea leaves to produce, for example, roasted tea.

[0002]

2. Description of the Related Art Conventionally, in the production of roasted green tea, bancha or sencha is formed by boiling with a high heat until a brown color is obtained in a roasting machine. The mixture was heated at about 200 ° C. until a boiled scent was formed, and then immediately cooled.

[0003] This processing requires roasting at a high temperature and requires experience and excellent intuition in quality control. The present inventor has already disclosed in Japanese Utility Model Publication No. 5-29034 and Japanese Utility Model Application 2-1.
No. 31893, No. 64-9593, No. 64-93
No. 49098, and the like.

[0004] However, these techniques merely increase the temperature of the atmosphere simply by blowing heated air into the rotating drum, so that the raw material moving in the rotating drum is heated from the lower side of the rotating drum. This is a heating process based on the temperature of the burner and the ambient temperature in the rotating drum, and it is difficult to uniformly heat the entire raw material moving in a layered manner.

[0005] In particular, since the raw material is supplied from the input port and taken out of the discharge port in a short time of less than 15 to 60 seconds, if the required amount of heat is insufficient, sufficient processing cannot be performed. If the setting is high, the tea leaves that are being heat-processed will generate a smoked odor due to the smoke emitted by the tea leaves themselves,
The color and taste are reduced by the smoke odor, and good hoji aroma may not be produced, or high quality hojicha may not be produced.

Further, simply blowing heated air into the rotary drum may cause the heating smoke filling the rotary drum to adhere to the tea leaves being processed, thereby deteriorating the quality. And other various problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has been achieved by heating the inside and outside of the rotary drum which has been heated by a heating means provided below the rotary drum and heated. Air is collected in an air collecting portion of an outer frame body of a rotating drum having an air collecting portion on an upper portion, and the heated air is sucked by a driving device and sent to an air feeding device disposed in the rotating drum.
In the air supply means, a pressure is supplied to a delivery base pipe attached to the delivery side of the driving means and facing the inside of the rotary drum, and is provided at the distal end of a large number of branch delivery pipes branched into the delivery base pipe. From the spray hole, sending heated air to the vicinity of the tea leaf sedimentary layer moving toward the product outlet along the inner wall of the rotating drum,
By directly blowing hot air onto raw tea leaves, it is possible to produce high-quality tea leaves excellent in color, aroma and taste by eliminating smoke and to provide a tea leaf heating processing apparatus and method which save energy during processing. It is intended to be.

[0008]

Means of the present invention for achieving the above object are to provide an airframe, a rotary drum rotatably supported in a substantially horizontal state on the airframe, and a rotary drum below the rotary drum. Heating means for heating the rotating drum to a predetermined temperature by being opposed thereto; a raw material inlet and a product outlet provided respectively on one side and the other side of the rotating drum; and an outer peripheral portion of the rotating drum. An outer frame body having an air collecting portion at the top, air feeding means disposed in the rotary drum, and a pipe provided between the air feeding means and the air collecting portion to be provided in the middle of the air collecting portion. And a driving means for feeding heated exhaust gas into the rotating drum, wherein the air feeding means is attached to a discharging side of the driving means and faces a delivery base tube facing the rotating drum. A plurality of branch delivery pipes projecting from the delivery base pipe at predetermined intervals along the moving direction of the raw material. Each of the outlet pipes has a spraying hole at a tip end thereof, and the spraying hole is arranged in the vicinity of a tea leaf deposit layer moving toward a product outlet along the inner wall of the rotating drum, and is configured as a tea leaf heating apparatus. It is in.

Then, the raw material is supplied from a raw material input port provided on one side of the rotary drum, transferred by an internal helical feed member, and sequentially heated and processed from a product outlet provided on the other side of the rotary drum. In the tea leaf heating processing device for taking out the product, the air inside and outside the rotary drum heated by a heating means opposed to the lower side of the rotary drum and heated to a temperature higher than The heated air is collected in an air collecting portion of the outer frame body, and the heated air is sucked by a driving means and sent to an air feeding means provided in the rotary drum, and is moved by the air feeding means in the rotary drum. There is a tea leaf heating processing method in which hot air is directly applied to a tea leaf deposition layer.

[0010] Further, the raw material is supplied from a raw material input port provided on one side of the rotary drum, transferred by an internal spiral feed member, and heated and processed sequentially from a product outlet provided on the other side of the rotary drum. In the tea leaf heating processing device for taking out the product, the air inside and outside the rotary drum heated by a heating means opposed to the lower side of the rotary drum and heated to a temperature higher than The heated air is collected by an air collecting portion of the outer frame body, and the heated air is sucked by a driving means and sent to an air feeding means disposed in the rotary drum. Attached and pressure-fed to a delivery base pipe facing the inside of the rotary drum, and along the inner wall of the rotary drum from spray holes provided at the distal end of a large number of branch delivery pipes branched into the delivery base pipe. The above addition to the vicinity of the tea leaf sedimentary layer moving toward the product outlet In tea leaves heat processing method for heating by sending the air.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a tea leaf heating apparatus and method according to the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral A denotes a tea leaf heating processing apparatus which is used, for example, for producing roasted tea. It is basically constituted by the outlet 5, the outer frame body 6, the air supply means 7, and the drive means 8.

The rotary drum 2 is formed in a cylindrical shape which is horizontally long and has a hollow portion therein, and is substantially horizontal with respect to the fuselage 1 (from a raw material inlet 4 to a product outlet 5 described later). The outer periphery may be rotatably supported by the rotating means 9 at a predetermined downward or upward slope.

The rotating means 9 has an outer peripheral portion of the rotating drum 2 supported by rollers 10 and 10 located at the front and rear thereof, and a rotating member 11 such as a motor is linked to one of the rollers 10. Then, the rotary drum 2 is continuously rotated in one direction at a predetermined speed.

A spiral blade-like transfer member 12 is provided inside the rotary drum 2 at substantially the entire length thereof, and a material b to be processed by the continuously formed transfer member 12 is provided. The transfer grooves 13 capable of storing a fixed amount are continuously formed in multiple strips.

The transfer member 12 conveys a certain amount of the raw material b from a raw material inlet 4 to a product outlet 5 described later.

The heating means 3 is provided below the rotary drum 2 to heat the rotary drum 2 to a predetermined temperature, and is a conventional burner corresponding to substantially the entire length of the rotary drum 2 in the longitudinal direction. Is used.

The above-mentioned material inlet 4 and product outlet 5
Are provided on one side and the other side in the longitudinal direction of the rotating drum 2, and a predetermined amount of the raw material is continuously supplied to the raw material inlet 4 through the hopper 14.

The product outlet 5 is for taking out the processed raw material b conveyed by the transfer member 12, and a discharge conveyor 15 below which the processed raw material b is fed to the next step.
Is made to correspond.

The above-mentioned outer frame body 6 has an air collecting portion 16 at its upper portion so as to surround substantially the entire outer peripheral portion of the rotary drum 2, and the heating device 3 heats the rotary drum 2 to heat the rotary drum 2. The outer peripheral air of the rotary drum 2 heated by the burner in 3 rises and collects in the air collecting portion 16, and the exhaust gas discharged from the opening 17 at the end portion of the rotary drum 2 collects in the air collecting portion 16. In any case, the air is heated to a high temperature, and is in a substantially oxygen-free state.

The above-mentioned air supply means 7 is provided in the rotary drum 2 and feeds the hot air gathered in the air collecting portion 16 into the rotary drum 2. The delivery base tube 18 attached to the delivery side of the driving means 8 and facing the inside of the rotary drum 2
And a plurality of branch delivery pipes 19 projecting from the delivery base pipe 18 at predetermined intervals along the moving direction of the raw material b.

The driving means 8 includes the air feeding means 7.
Is provided in the middle of the pipe 20 connecting the delivery base pipe 18 and the air collecting unit 16 in the above, and sucks the heated exhaust air of the air collecting unit 16 and sends it into the rotary drum 2 using a conventional blower or the like. .

Each of the branch delivery pipes 19 has a blowing hole 21 at the tip of the branch delivery pipe 19, and the blowing hole 21 is directed toward the product outlet 5 along the inner wall of the rotary drum 2. In the vicinity of the tea leaf deposit layer b1 that moves.

It should be noted that the spray hole 2 in this branch delivery pipe 19
1 is preferably arranged such that hot air is applied to a position corresponding to the tea leaves b deposited in a layer on the transfer groove 13 of the transfer member 12, and the branch delivery pipe 19 is provided for each adjacent transfer groove 13. The plurality of branch delivery pipes 19 may be provided with different corresponding distances (such as heights) to the accumulated tea leaves b.

In FIGS. 1 and 2, reference numeral 25 denotes an outside air inlet provided in the outer frame body 6, which is opened in the vicinity corresponding to the heating means 3, and fresh air is appropriately introduced into the outer frame body 6. .

Therefore, the apparatus A and the method for heating tea leaves of the embodiment of the present invention configured as described above have the following effects, and a process for producing roasted green tea from sencha will be described.

The rotating drum 2 is rotated by the rotating means 9, for example.
It is driven to rotate at a speed of 30 revolutions per minute, and its outer peripheral portion is heated at about 250 ° C. to 400 ° C. by the heating means 3.

Therefore, the transfer member 1 inside the rotary drum 2
2 is also heated, and the whole is at a predetermined temperature, for example, 220 ° C. to 3
Raise the temperature to about 00 ° C.

In this state, a predetermined amount of the green tea b, which is the raw material charged into the hopper 14, is sequentially supplied from the raw material charging port 4 of the rotary drum 2, and can be stored in the transfer groove 13 of the transfer member 12. The raw material b is in contact with the transfer member 12 and the inner wall of the rotary drum 2 at the bottom of the rotary drum 2, and
The rotary drum 2 is transferred toward the product outlet 5 by a predetermined movement amount in contact with the high temperature atmosphere.

At this time, the raw material b moves upward from the bottom of the rotary drum 2 in the direction of rotation following the rotation of the rotary drum 2 and, when it rises to a certain position, due to its own weight of the layer, the raw material b. It is agitated while sliding down to the bottom, and the transfer is continued while repeating this operation.

The air supply means 7 inserted into the rotary drum 2
Is heated and dried by the hot air from the blowing port 21 at the tip end of the branch delivery pipe 19 branched from the delivery base pipe 18 directly hitting the material deposition layer b1.

In the hot air, the air in the outer frame 6 heated by the heating means 3 and the combustion air exhausted from the opening 17 of the rotary drum 2 are collected in the air collecting section 16 and the driving means 8
When the roasting of the tea leaves is started, most of the sent air is exhausted from the rotating drum 2 when the roasting of the tea leaves is started. The exhaust gas is what becomes so-called secondary air for combustion, and has a sufficient amount of heat, which is hardly cooled.

Therefore, a high temperature required for roasting, that is, a hot air of 205 ° C. to 215 ° C. (for example) is blown onto the deposited raw material b, and the processing of the raw material b proceeds. A plurality of branch delivery pipes 19, 19,... Provided in parallel in the length direction of the rotating drum 2 continuously and continuously blow hot air at a predetermined temperature, thereby performing good heating and moisture-controlled processing such as drying. Done.

Further, the direct blowing of hot air to the raw material b by the air supply means 7 is performed even when the deposition raw material b1 is located at the bottom of the rotary drum 2 as shown in FIG. As shown in FIG. 3 (b), since it is arranged so as to be able to move along with the rotary drum 2 and irradiate any time when it rises in the rotation direction by a predetermined amount, the entire deposition material b1 is uniformly distributed. The hot air impinging on the tea leaves can obtain desired blowing conditions by appropriately adjusting the blowing angle of the branch delivery pipe 19.

Moreover, since the hot air can be directly applied to the vicinity of the deposition material b1, the burnt smoke generated by heating by the heating means 3 blows off the vicinity of the deposition material b1 to be stagnated and smokes in the vicinity. To prevent the deposition of smoke on the deposition raw material b1,
It is possible to prevent discoloration of tea leaves and deterioration of roasted scent caused by smoking, and prevent unsanitary and harmful effects of drinking the smoked tea leaves.

Further, since the hot air uses secondary air generated from the inside of the rotary drum 2, energy can be saved, and an oxygen-free state can be applied to the raw material b as much as possible. Therefore, there is no deterioration in quality due to oxidation.

The raw material transferred to the rear along with the rotation of the rotary drum 2 undergoes a predetermined processing, and upon completion of the processing, drops from the product outlet 5 onto the discharge conveyor 15 and proceeds to the next step. Conveyed.

As described above, if a fixed amount of the raw material is continuously supplied from the raw material input port 4, heating and stirring are performed in the rotating rotary drum 2, and after a predetermined time, the processing is completed from the product outlet 5. Products are continuously taken out.

[0039]

According to the present invention having the above-described structure, an air supply means for irradiating a hot air of a predetermined temperature to the vicinity of the raw material deposited in the rotary drum is provided, so that the raw material can be heated. Therefore, the synergistic effect of the heating from the rotating drum and the direct blowing of hot air by the air supply means can more effectively perform the action, and a tea leaf having good color, flavor and taste can be obtained.

In addition, since hot air is directly blown onto the raw tea leaves, smoked air can be forcibly removed, and the color and taste of the product tea leaves can be prevented from lowering due to the adhesion of smoke.

By using oxygen-free secondary air as the hot air blown onto the raw material, high-temperature exhaust gas can be circulated and used without causing deterioration of the product quality due to oxidation, resulting in good thermal efficiency and energy saving. As a result, fuel consumption is reduced. And so on.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional front view showing an embodiment of a tea leaf heating processing apparatus employing an article conveying method according to the present invention.

FIG. 2 is a schematic longitudinal side view of the device in FIG.

FIG. 3 is an explanatory diagram showing, in an enlarged manner, a raw material transport state of the apparatus in FIG. 1;

[Explanation of symbols]

 Reference Signs List A A tea leaf heating apparatus b Raw material 1 Airframe 2 Rotating drum 3 Heating means 4 Raw material inlet 5 Product outlet 6 Outer frame 7 Air supply means 8 Drive means 10 Drive means 16 Air supply unit 18 Delivery base pipe 19 Branch delivery pipe 21 Spray hole

Claims (3)

[Claims] 1. A fuselage, a rotating drum rotatably supported on the fuselage in a substantially horizontal state, heating means opposed to a lower portion of the rotating drum to heat the rotating drum to a predetermined temperature, and A raw material inlet and a product outlet provided on one side and the other side of the rotating drum, an outer frame surrounding the outer peripheral portion of the rotating drum and having an air collecting portion at an upper portion, and into the rotating drum. Tea leaf heating processing comprising: an air supply means provided; and a driving means provided in the middle of a pipe connecting the air supply means and the air collection part and for sending the heated exhaust air of the air collection part into the rotary drum. In the apparatus, the air supply means includes a delivery base pipe attached to a delivery side of the driving means and facing the inside of the rotary drum, and a plurality of projections at predetermined intervals along the moving direction of the raw material to the delivery base pipe. The branch delivery pipe has a spray hole at its tip,
The apparatus for heating and processing tea leaves, wherein the spray holes are disposed in the vicinity of a layer of tea leaves that moves toward a product outlet along an inner wall of the rotating drum. 2. A raw material is supplied from a raw material input port provided on one side of the rotary drum, transferred by an internal spiral feed member, and sequentially heated from a product outlet provided on another side of the rotary drum. In the tea leaf heating and processing apparatus for taking out the product, the air inside and outside the rotary drum heated by the heating means opposed to the lower side of the rotary drum and heated, The heated air is collected by an air collecting portion of the outer frame body, and the heated air is sucked by a driving means and sent to an air feeding means disposed in the rotary drum. The air is moved by the air feeding means in the rotary drum. A method for heating and processing tea leaves, wherein hot air is directly applied to the tea leaf deposition layer. 3. A raw material is supplied from a raw material input port provided on one side of the rotary drum, transferred by an internal spiral feed member, and sequentially heated and processed from a product outlet provided on another side of the rotary drum. In the tea leaf heating and processing apparatus for taking out the product, the air inside and outside the rotary drum heated by the heating means opposed to the lower side of the rotary drum and heated, The heating air is collected in an air collecting portion of the outer frame body, and the heated air is sucked by a driving means and sent to an air feeding means disposed in the rotary drum. In the air feeding means, a delivery side of the driving means is provided. Attached and pressure-fed to a delivery base pipe facing the inside of the rotary drum, and along the inner wall of the rotary drum from spray holes provided at the distal end of a large number of branch delivery pipes branched into the delivery base pipe. The heating space is provided near the tea leaf sedimentary layer moving toward the product outlet. Tea heat processing method characterized by heating by sending a.