JP2020124151A - Dryer of tea and drying method - Google Patents

Abstract

To provide a dryer of tea capable of sufficiently obtaining flavor unique to tea while increasing a dry treatment amount per unit time and a drying method.SOLUTION: A dryer of tea for obtaining tea by drying while transporting the tea undergone a process of deactivating an enzyme is provided with a brick tea furnace 3 (a first dryer of a first drying process) in which heat is applied to tea leaf in the transportation process to dry, a drying effect due to heat is set higher than drying with window, and a net type tea furnace 4 (a second dryer of a second drying process) in which window is blown to tea leaf during transportation to set the drying effect due to window higher than drying by heat. A drying method using the device, is also provided.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a dried green tea device and a dry method for drying green tea leaves to obtain green tea.

Sencha, which is mainly used as a raw material for matcha, is obtained by steaming tea leaves that have been covered before harvesting for a certain period of time and dried without rubbing, and is mainly used as a raw material for matcha, and its aroma is unique. It has a covering scent and is said to be moderately fragrant. In particular, tencha contains a large amount of theanine, an amino acid (derivative of glutamic acid) among tea leaves, and therefore has an effect of relaxing and enhancing concentration. Conventionally, as a processing device (an tea oven) capable of continuously processing such tea and mass-producing it, for example, one disclosed in Patent Document 1 has been proposed.

JP, 2013-223441, A

However, in the net type tea ceremony furnace like the above-mentioned conventional technique, since the tea ceremony is processed by applying hot air while stirring the tea leaves that are continuously conveyed, it is possible to use bricks that have been used since ancient times. There was a problem that the original fragrance of the original green tea was insufficient compared to the case where the green tea was dried using a drying device (brick green tea oven). On the other hand, when tea leaves are obtained by drying tea leaves in a brick tea oven that has been used since ancient times, although the unique aroma of the tea can be sufficiently obtained, there is almost no drying effect by wind, and drying with heat is not necessary. Therefore, since the drying efficiency is poor, it is impossible to increase the amount of drying treatment per unit time as compared with the net type tea ceremony furnace.

The present invention has been made in view of the above circumstances, and provides a drying device and a drying method for an unbleached tea, which is capable of sufficiently obtaining the unique aroma of the unbleached green tea while increasing the amount of drying treatment per unit time. Especially.

The invention according to claim 1 is an apparatus for drying green tea for transporting and drying green tea leaves that have been subjected to a step of deactivating an enzyme, wherein heat is applied to the green tea leaves during the transportation process to dry, The first drying device, in which the drying effect by heat is set higher than the drying by heat, and the second drying, in which the drying effect by wind is set higher than the drying by heat, by blowing air on the tea leaves in the conveying process. And a device.

The invention according to claim 2 is the device for drying green tea according to claim 1, wherein in the first drying device, the drying portion of the tea leaves is composed of bricks, and radiant heat from the bricks is added to the tea leaves in the conveying process. It is characterized by comprising a brick tea oven that dries and dries.

A third aspect of the present invention is characterized in that, in the green tea drying apparatus according to the second aspect, a desolving means for unfolding the tea leaves is provided on the side of the brick green tea furnace where the tea leaves are fed.

The invention according to claim 4 is the device for drying green tea according to claim 1, wherein the second drying device is capable of ejecting hot air or humidified hot air to the drying portion of the tea leaves, and the hot air is being conveyed. It is characterized by consisting of a net-type tea-ceramic oven which is dried by being applied to.

According to a fifth aspect of the present invention, in the device for drying green tea according to the first aspect, the second drying device is capable of ejecting superheated steam to a drying portion of tea leaves, and the superheated steam is applied to tea leaves in a conveying process. It is characterized by being composed of a net type tea ceremony oven that is applied and dried.

According to a sixth aspect of the present invention, in the dry tea drying device according to any one of the first to fifth aspects, after drying by the first drying device, drying by the second drying device is performed. To do.

The invention according to claim 7 is a method for drying sesame tea for conveying and drying tea leaves that have been subjected to a step of deactivating an enzyme, wherein heat is applied to the tea leaves in the conveying process to dry the leaves. The first drying step, in which the drying effect by heat is set higher than the drying by heat, and the second drying in which the drying effect by wind is set higher than the drying by heat, by drying the tea leaves by blowing air And a process.

The invention according to claim 8 is the method for drying green tea according to claim 7, wherein in the first drying step, the drying part of the tea leaves is made of bricks, and radiant heat from the bricks is added to the tea leaves in the conveying process. It is characterized by drying tea leaves in a brick tea oven.

A ninth aspect of the present invention is characterized in that, in the method for drying green tea according to the eighth aspect, an unraveling means for unfolding the tea leaves is arranged on the side of the brick tea oven where the tea leaves are fed.

The invention according to claim 10 is the method for drying green tea according to claim 7, wherein in the second drying step, hot air or humidified hot air can be jetted to the drying portion of the tea leaf, and the hot air is conveyed during the process. It is characterized in that the tea leaves are dried in a net-type sand tea oven that is applied to and dried.

The invention according to claim 11 is the method for drying green tea according to claim 7, wherein in the second drying step, superheated steam can be ejected to the drying portion of the tea leaves, and the superheated steam is transferred to the tea leaves in the conveying process. It is characterized by being composed of a net type tea ceremony oven that is applied and dried.

A twelfth aspect of the present invention is characterized in that, in the method for drying green tea according to any one of the seventh to eleventh aspects, the second drying step is performed after the first drying step.

According to the invention of claims 1 and 7, a first drying device or a first drying process in which heat is applied to the tea leaves during the conveyance process to dry them and the drying effect by heat is set higher than the drying effect by wind. Since there is a second drying device or a second drying process in which the drying effect of the wind is set higher than the drying by heat, the drying process amount per unit time While increasing the amount, it is possible to fully obtain the unique aroma of tea.

According to the invention of claims 2 and 8, in the first drying device (first drying step), the drying portion of the tea leaves is composed of bricks, and the radiant heat from the bricks is added to the tea leaves in the conveying process to dry them. Since it consists of a brick tea oven, it is possible to obtain tea with a unique aroma equivalent to that of a brick tea oven that has been used since ancient times.

According to the inventions of claims 3 and 9, since the tea leaf input side of the brick-and-tea tea furnace is provided with the unraveling means for unfolding the tea leaves, the brick-and-tea tea furnace can be surely and smoothly dried. You can

According to the invention of claims 4 and 10, the second drying device (second drying step) is capable of ejecting hot air or humidified hot air to the drying portion of the tea leaves, and applying the hot air to the tea leaves in the conveying process. Since it is composed of a net-type green tea oven for drying, it is possible to increase the amount of drying treatment per unit time.

According to the invention of claims 5 and 11, the second drying device (second drying step) is capable of ejecting the superheated steam to the drying portion of the tea leaves and applying the superheated steam to the tea leaves in the conveying process to dry them. Since it is composed of a net type tea-tea making furnace, it is possible to more efficiently dry tea leaves while increasing the amount of drying treatment per unit time.

According to the inventions of claims 6 and 12, since the drying by the second drying device (the second drying process) is performed after the drying by the first drying device (the first drying process), the heat is generated in the initial stage of the drying process in which the water content is high. It is possible to generate a larger amount of scent components, and by applying air in the latter stage of drying when the water content is low, it is possible to efficiently dry and suppress deterioration of the color range.

The schematic diagram which shows the processing line to which the drying device of the green tea which concerns on the 1st Embodiment of this invention is applied. Side view showing brick brick tea oven (first drying device) of the same processing line Side view showing the net-type tea ceremony furnace (second drying device) of the same processing line Plan view showing the same net type tea ceremony furnace Schematic diagram showing the internal structure of the same net type tea ceremony furnace A side view showing a net type tea ceremony furnace (second drying device) according to another embodiment of the present invention. The schematic diagram which shows the internal structure of the net type tea-tea making furnace (2nd drying apparatus) which concerns on other embodiment (drying with humidified hot air) of this invention. A schematic diagram showing an apparatus for generating superheated steam, which is applied to a net type tea-tea oven (second drying apparatus) according to still another embodiment (drying with superheated steam) of the present invention.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The processing line to which the dry tea drying apparatus according to the first embodiment is applied is for steaming tea leaves that have been covered and shaded for a predetermined period before harvesting and dried without rubbing to obtain green tea. As shown, a steamer 1, a tea-discharging machine 2, a brick tea ceremony oven 3 (first drying device) that performs the first drying step, and a net-type tea ceremony oven 4 (second drying apparatus) that performs the second drying step. It is configured to have a hoisting machine 5, a wind power sorter 6, and a finishing dryer 7.

The steamer 1 is for performing a steaming step (step of deactivating the enzyme), and heats and softens the tea leaves fed from the leaf feeder in the steamer to impart physical and chemical changes. The enzyme is inactivated by steaming, and the steamed leaves can be cooled with cold air or warm air while being continuously conveyed by a net conveyor or the like. The tea-discharging machine 2 (disassembling means) is arranged on the tea-leaf input side (the input section A side) of the brick-and-sheath tea furnace 3, and after the steam-dissolving process in the steamer 1 is performed to remove the overlap of the tea-leaves and then It can be put into.

The brick brick tea oven 3 (first drying device) and the net-type tea tea oven 4 (second drying device) convey and dry the tea leaves in which the enzyme has been deactivated through the steaming process to obtain the tea. In the embodiment, after the first drying process by the brick tea ceremony furnace 3 (first drying device), the second drying process by the net type tea ceremony furnace 4 (second drying device) is performed. In addition, since the dry treatment amount of tea leaves by the brick-and-tea tea oven 3 according to the present embodiment is smaller than the dry treatment amount of tea leaves by the net-type and tea-tea oven 4, two brick-and-tea ovens 3 are arranged in parallel, and tea leaves After being dried, the subsequent drying is performed in one net type tea ceremony furnace 4.

The brick-sanded tea oven 3 (first drying device) is configured such that the drying effect by heat is set to be higher than the drying by wind by applying heat to the tea leaves in the conveying process to dry the tea leaves, and as shown in FIG. The drying section B of the tea leaves is made of bricks, and the radiant heat from the bricks is added to the tea leaves in the conveying process to be dried. In the brick-and-green tea furnace 3 according to the present embodiment, after the tea leaves whose overlapping has been solved by the tea-discharging machine 2 are introduced from the introduction section A1, the flame from the burner 8 is conveyed in the conveyance zone W1 of the drying section B. Is dried by the radiant heat generated in the bricks constituting the drying section B, which is stored in the smoke guide E heated by the above, is transferred from the discharging section C1 to the charging section A2, and is again in the second stage of the drying section B. The carrier W2 can be used for carrying and drying, and can be taken out by the discharging section C2.

Here, the brick tea ceremony furnace 3 according to the present embodiment is composed of members in which the conveyor bands W1 and W2 are formed endlessly, and has a two-stage conveyor path in the vertical direction, The first stage (lower stage) is dried at about 210 to 230° C. for about 2.5 to 3 minutes, and then the second stage (upper stage) is dried at about 120° C. for about 3 minutes. By drying under such conditions, roasted aroma can be added without degrading the color of tea leaves.

The net-type green tea furnace 4 (second drying device) is designed to have a higher drying effect by wind than drying by heat by blowing air on the tea leaves in the conveying process, and is shown in FIGS. As described above, the hot air can be jetted to the drying section B for the tea leaves, and the hot air is applied to the tea leaves in the conveying process to be dried. In the net type tea ceremony furnace 4 according to the present embodiment, the tea leaves dried in the brick tea ceremony furnace 3 are unraveled by the tea-discharging machine 2 and are thrown in from the feeding section A, and then in the transport zone W in the drying section B. The hot air generated by the hot air generating means 9 is applied to the tea leaves to dry them during the transportation process, and the tea leaves can be taken out at the unloading section C.

However, the brick-type tea-tea oven 3 (first drying device) applies heat exclusively to the tea leaves in the conveying process to dry them, whereas the net-type tea-tea oven 4 (second drying device) applies hot air. Therefore, heat is applied, but it is said that the drying by wind has a relatively higher drying effect than the drying by heat.

The conveyor belt W is made of an endless member, and is capable of carrying tea leaves while being placed thereon. The hot air generating means 9 has a heating means such as a burner and a blowing means such as a fan, and is capable of adjusting the hot air to be adjustable. The hot air is blown from below the carrier zone W through the flow path section 10. Is configured to get. That is, as shown in FIG. 5, the tip of the flow path portion 10 is connected to the space below the conveyor belt W in the net-type tea ceremony furnace 4 via the connecting portion 10 a, and the flow is generated by the hot air generating means 9. The hot air is applied to the tea leaves in the process of being conveyed in the conveyor belt W to be dried.

Furthermore, the net type tea-tea making furnace 4 according to the present embodiment is provided with a leveling means 11 and a stirring means 12. The leveling means 11 is mounted on the tea leaf transporting path in the feeding section A, and rotates a plurality of blades (blades) to place the tea leaves (steaming) on the transporting belt W in a stacked state in the transporting process. Leaves) are configured to have a uniform thickness. The stirring means 12 is mounted on the tea leaf conveyance path in the drying section B, and is rotated in a plurality of blades (blades) to be placed in a stacked state on the conveyance belt W in a conveyance process (tea leaves (steamed leaf). ), the tea leaves can be stirred (turned upside down).

Here, in the net type tea ceremony furnace 4 according to the present embodiment, the drying section B is composed of four boxes (sections), and the box closest to the charging section A has a temperature of about 120 to 150° C. and a box adjacent thereto. The temperature of the box closest to the carry-out section C and the box adjacent thereto is set to about 80 to 100 °C, the drying time is set to 7 to 8 minutes in the entire drying section B, and the tea layer is 50 It is set to about 70 mm. By drying under such conditions, it is possible to improve the line performance while avoiding the deterioration of the color saturation of the tea leaves.

Then, the tea leaves dried in the brick tea ceremony furnace 3 (first drying apparatus) and the net type tea ceremony furnace 4 (second drying apparatus) are separated from the stem portion and the leaf portion by the vine cutting machine 5 and are subjected to the wind power selection. After the stem portion and the leaf portion are selected by the machine 6, the finish dryer 7 performs the finish drying. By going through such a series of steps, it is possible to obtain high-quality tencha with a unique aroma.

According to the first embodiment, the brick-and-tea oven 3 (first drying device or first drying step) for applying heat to the tea leaves during the transportation process to dry the tea leaves, and blowing the tea leaves during the transportation process with air Since it has the net type tea-tea oven 4 (second drying device or second drying process) for drying by drying, it is possible to sufficiently obtain the original aroma of tea-tea while increasing the amount of drying treatment per unit time. In addition, since the drying process includes two different drying processes, that is, a first drying process by the first drying device and a second drying process by the second drying device, it is possible to broaden the range of setting conditions for drying the tea leaves. In particular, since the drying by the second drying device (the second drying process) is performed after the drying by the first drying device (the first drying process), by adding heat at the initial stage of the drying process in which the water content is high, the scent component is further improved. In addition to being able to generate a large amount, it is possible to efficiently dry by applying air in the latter stage of drying in which the water content is low, and it is possible to suppress deterioration of the color range.

Further, since the first drying device (first drying step) is composed of bricks in the drying portion of the tea leaves, and is composed of the brick-roasted tea oven 3 for adding the radiant heat from the bricks to the tea leaves in the conveying process to dry the bricks, It is possible to obtain the green tea with a unique aroma equivalent to that of the brick green tea furnace that was used more. Furthermore, since the tea-discharging means 2 for unfolding the tea leaves is provided on the side of the brick-and-tea tea furnace 3 where the tea leaves are fed, the brick-and-tea tea furnace 3 can be surely and smoothly dried. Furthermore, since the second drying device (second drying step) is capable of ejecting hot air to the drying section B of the tea leaves, and comprises the net type tea-tea oven 4 for applying the hot air to the tea leaves in the conveying process to dry them. The amount of dry processing per unit time can be increased.

Although the green tea drying device according to the present embodiment has been described above, the green tea drying device according to the present invention is not limited to the above-mentioned one. For example, as shown in FIG. 6, irradiation capable of irradiating infrared rays or far infrared rays is possible. The net type tea-tea oven 4 (second drying device) equipped with the means 13 may be used. In the net type tea ceremony furnace 4, a plurality of irradiating means 13 are arranged in the tea conveying direction in the drying section B, and the irradiating means 13 can irradiate infrared rays or far infrared rays to the tea leaves in the conveying process. ..

In this case, the irradiating means 13 is attached to the ceiling part of the drying section B which covers the upper part of the conveyor belt W, and can irradiate the tea leaves on the conveyor belt W with infrared rays or far infrared rays in a planar manner. There is. As a result, the tea leaves (steamed leaves) in the process of being transported through the drying section B by the transport belt W are exposed to the hot air from the hot air generating means 9 and dried, and are irradiated with infrared rays or far infrared rays from the irradiation means 13. Then, the chemical action is applied. In addition, as shown in the figure, the drying section B is formed with an exhaust damper 14 capable of exhausting the closed space arbitrarily. The exhaust damper 14 includes an opening/closing door formed at a predetermined portion of the ceiling of the drying section B, and is opened by swinging around a hinge or the like to open the closed space of the drying section B. The exhaust can be discharged upward.

Further, as another example of the net type tea-tea making furnace 4 (second drying device), as shown in FIG. 7, a hot-air generating means 9 and a steam boiler 15 are provided, and humidified hot air can be jetted to the tea leaf drying portion B. At the same time, the hot air may be applied to the tea leaves to be dried during the carrying process. In this case, the steam generated in the steam boiler 15 and the hot air generated in the hot air generating means 9 are mixed to generate humidified hot air, and the humidified hot air passes through the flow path section 10 and is conveyed in the conveyance zone W. It is possible to obtain tencha by drying by hitting.

In this way, by drying the tea leaf drying portion B in a high temperature and high humidity state, it is possible to sufficiently dry the tea leaf in the conveying process, and it is possible to prevent the quality from being adversely affected. Further, since the humidified hot air is blown onto the tea leaves to dry them, the temperature and humidity can be properly controlled. Therefore, the tea leaves in the carrying process can be dried more sufficiently and stably, and it is possible to prevent the quality from being adversely affected.

Further, as described above, instead of the humidified hot air, superheated steam may be jetted onto the tea leaves to be dried to be dried. The superheated steam is generated by a superheated steam generator having a steam boiler 15 and a heating chamber 16 as shown in FIG. 8, and is ejected onto the tea leaves conveyed in the conveyance zone W. It is supposed to be dried.

According to this superheated steam generator, the normal steam of about 100° C. generated in the steam boiler 15 reaches the heating chamber 16 via the hose H1, and the temperature thereof is raised to about 120 to 400° C., and then the transfer zone W is generated. To be sent to. In the heating chamber 16, as shown in the figure, the gun type burner 17 is connected to the suction pipe 16c, and hot air from the gun type burner 17 can be discharged from the discharge pipe 16b after passing through the heating chamber 16. Is configured. On the other hand, a plurality of thin tubes 16a are arranged inside the heating chamber 16, one end of the thin tubes 16a is connected to the hose H1, and the other end is connected to the hose H2.

With such a configuration, in the process in which the ordinary steam sent from the steam boiler 15 passes through the thin tube 16a, it is heated to about 120 to 400° C. by the hot air from the gun type burner 17, and superheated steam is generated. .. The superheated steam generated in this way is ejected onto the tea leaves conveyed in the conveyor zone W, so that the tea temperature can be effectively raised, and the tea leaves in the conveying process can be sufficiently dried. That is, since the second drying device (second drying step) is capable of ejecting superheated steam to the drying portion of the tea leaves, and is composed of the net type tea-ceramic oven 4 for applying the superheated steam to the tea leaves in the conveying process to dry them. It is possible to dry tea leaves more efficiently while increasing the amount of drying treatment per unit time.

In addition, as a tea-discharging machine 2 (dissolving means) for uniformly distributing the tea leaves to be fed into the net type tea-tea making furnace 4, an andon, a belt conveyor or the like may be provided, and a pressure is applied to the tea leaves so that the surface has moisture. You may make it arrange|position the pressing device which can make it float uniformly in the processing line. By providing a bypass route in the drying process, the drying order of the first drying device (brick tea ceremony furnace 3) and the second drying device (net type tea ceremony furnace 4) may be arbitrarily exchanged. The step of deactivating the enzyme is not limited to the steaming step by the steamer 1 as in the present embodiment, and a method other than steam, such as roasting in a kettle, steaming with steam, steaming with hot water, and hot air may be used.

Heat is applied to the tea leaves during the conveyance process to dry them, and the first drying device is set to have a higher drying effect by heat than the drying by the wind. As long as it is a drying device and a drying method for tea that has a second drying device in which the drying effect by the wind is set higher than the drying, it should be applied to those having different external shapes or those having other functions. You can

1 Steamer 2 Tea-discharging machine (dissolving means)
3 brick brick tea oven (first drying device)
4 Net type tea ceremony furnace (second drying device)
5 Hopping machine 6 Wind power sorter 7 Finishing dryer 8 Burner 9 Hot air generating means 10 Flow path section 10a Connection section 11 Leveling means 12 Stirring means 13 Irradiation means 14 Exhaust damper 15 Steam boiler 16 Heating chamber 17 Gun type burner A input Part B Drying part C Unloading part W Conveying band

Claims (12)

In a tencha drying apparatus for obtaining tencha by drying while conveying tea leaves that have undergone the step of deactivating the enzyme,
A first drying device in which the drying effect of heat is set higher than that of drying by wind, by applying heat to the tea leaves during the transportation process to dry them;
A second drying device in which the drying effect of the wind is set higher than the drying of the heat by applying air to the tea leaves in the conveying process to dry them.
An apparatus for drying green tea, comprising: 2. The green tea according to claim 1, wherein the first drying device is composed of a brick and a tea oven in which the drying portion of the tea leaves is made of bricks and radiant heat from the bricks is added to the tea leaves in the conveying process to dry the tea leaves. Drying equipment. 3. The dry tea drying apparatus according to claim 2, further comprising a disentangling means for disentangling the overlapping of the tea leaves, which is provided on the side of the brick tea ceremony furnace where the tea leaves are fed. The second drying device is capable of ejecting hot air or humidified hot air to the drying portion of the tea leaves, and comprises a net type tea-tea oven for applying the hot air to the tea leaves in the conveying process to dry the tea leaves. The dried tea drying device described above. 2. The second drying device is capable of ejecting superheated steam to the drying portion of the tea leaves, and comprises a net type tea-tea oven for applying the superheated steam to the tea leaves in the conveying process to dry the tea leaves. Green tea drying equipment. The drying device for glutinous tea according to any one of claims 1 to 5, wherein the drying by the second drying device is performed after the drying by the first drying device. In the method for drying edible tea to obtain edible tea by drying while conveying the tea leaves that have undergone the step of deactivating the enzyme,
A first drying step in which heat is applied to the tea leaves during the transportation process to dry them, and the drying effect by heat is set higher than the drying effect by wind;
A second drying step in which the drying effect of the wind is set higher than the drying of the heat by applying air to the tea leaves in the conveying process to dry them.
A method for drying tencha, which comprises: In the first drying step, the tea leaf drying section is made of bricks, and the tea leaves are dried in a brick-and-tea oven for adding radiant heat from the bricks to the tea leaves in the conveying process to dry the tea leaves. 7. The method for drying green tea according to 7. 9. The method for drying edible tea according to claim 8, wherein an unwinding means for unfolding the tea leaves is provided on the side of the brick tea oven where the tea leaves are put. The second drying step is characterized in that hot air or humidified hot air can be jetted to the drying section of the tea leaves, and the tea leaves are dried in a net-type sand tea oven for applying the hot air to the tea leaves in the conveying process to dry them. 8. The method for drying green tea according to claim 7. 8. The net-type green tea furnace, wherein the second drying step is capable of ejecting superheated steam to the drying portion of the tea leaves and applying the superheated steam to the tea leaves in the conveying process to dry the tea leaves. How to dry green tea. The method for drying green tea according to any one of claims 7 to 11, wherein the second drying step is performed after the first drying step.

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