JP5797931B2 - Coffee bean roasting apparatus and roasting method - Google Patents

Description

  The present invention relates to an apparatus for roasting coffee beans and a method for roasting coffee beans using the same.

To obtain a savory coffee, it is necessary to roast green beans appropriately.
In roasting, coffee beans are heated to hollow out the internal cellular tissue and extractable coffee components are attached to the cell membrane. If the roasting temperature of the beans exceeds 235 ° C, the scent component is lost. In order to obtain a good flavor, a high level of skill was required.
Therefore, in order to uniformly heat the inside, a method of slowly heating using far infrared rays or a method of slowly heating with direct fire while stirring the beans is adopted.
However, since the conventional roasting method was carried out in an oxidizing atmosphere in the atmosphere, the burning odor remained, the scent component was oxidized, and the flavor inherent to coffee beans was reduced.
Patent Document 1 proposes a method of steaming coffee beans for the purpose of improving coffee quality, but does not roast coffee beans.
Patent Document 2 discloses a roasting method in which after heating to a roasting temperature and then rapidly cooling in a dry atmosphere, an unpleasant burnt odor remains because of roasting in an oxidizing atmosphere.

Japanese Patent Laid-Open No. 3-160948 JP 2003-2898905 A

  An object of the present invention is to provide a coffee bean roasting apparatus and a roasting method thereof that can easily achieve a good flavor.

The present invention resides in that roasting can be performed under superheated steam in order to suppress unpleasant burning odor and oxidation of scent components.
Accordingly, the roasting apparatus according to the present invention includes a far-infrared generator for irradiating far-infrared rays toward the bean-roasted container for roasting coffee beans , including a bean-roasted container inside the roaster A steam superheater that supplies superheated steam of 300 ° C. or higher in the chamber, a steam generator that generates normal steam of 150 ° C. or lower, and the steam generator connected to the steam superheater And a means for switching between the state directly connected to the inside of the vessel, and the cooling after roasting the coffee beans with the superheated steam is switched from the superheated steam to the normal steam of 150 ° C. or less to be exposed to the atmosphere. It can be performed in a reducing atmosphere .

Here, the far-infrared generator may be a ceramic body that emits far-infrared rays when heat is applied.
This type of ceramic body is readily available as a far-infrared ceramic ball.
A far-infrared ceramic ball is a powder in which minerals mainly composed of SiO ₂ and Al ₂ O ₃ are powdered, and then this powder is formed into a ball shape by sintering. Radiate.
Therefore, the roasting device is equipped with a bean roasting container made of wire mesh and the like so that it can be rotated, and coffee beans are put into this bean roasting container, while superheated steam is applied to the ceramic body while rotating the bean roasting container, By supplying superheated steam into the vessel, roasting is possible in a reducing atmosphere with water vapor.
Superheated steam can be obtained by further superheating steam generated by boiling water.
The temperature of the superheated steam is used for roasting coffee beans in the range of 200 to 230 ° C., preferably about 500 ° C., and at least 300 ° C. is required.
In addition, in order to suppress a temperature drop when superheated steam is supplied into the inside of the roaster, the inside may be heated with an IH heater or the like.

If the coffee beans are roasted by superheated steam and far infrared rays and then discharged outside the vessel, the beans will be exposed to the atmosphere during high temperature, and the roasted beans will be oxidized in a reducing atmosphere. There is a fear.
Therefore, the present invention is also characterized in that the roasted beans can be cooled in a reducing atmosphere by switching overheated steam to normal steam.
This enabled roasting in a reducing atmosphere from the beginning to the end.

By using the roasting apparatus according to the present invention, after the coffee beans are roasted by superheated steam of 300 ° C. or higher and irradiation with far infrared rays, the coffee beans are exposed to the atmosphere by being cooled with normal steam of 150 ° C. or lower as they are . Without reduction .

  In the present invention, the coffee beans are roasted to a predetermined state with superheated steam and far infrared rays, and then can be cooled with normal steam as they are. An excellent flavor can be obtained.

The structural example of the roasting apparatus of the coffee beans which concerns on this invention is shown.

FIG. 1 schematically shows a configuration example of a roasting apparatus according to the present invention.
The roasting device 10 has a bean ware container 11 arranged in a chamber 10 a that is kept warm or insulated.
The bean ware container is configured so that the upper and lower wire meshes 11a and 11b can be halved, and the coffee beans are taken in and out of the wire mesh containers.
The soy ware container 11 is connected to a shaft 11c and is rotatably supported by a handle 11d.
The ceramic body 13 made of a far-infrared ceramic ball is disposed at the bottom of the chamber 10a, and the steam supply ports 22a and 22b of the pipe 22 are provided below the ceramic body 13 so that the superheated steam passes between the ceramic bodies 13. In this way, it is supplied to the inside 10a.
In this embodiment, the IH heater 12 is provided at the bottom of the vessel to prevent the temperature of the superheated steam from decreasing.
The temperature of the heater is controlled while detecting the temperature with the temperature sensor 12a, and the temperature inside the container is detected and controlled with the temperature sensor 10b.
Further, the inside 10a can be seen from the viewing window 10d, and surplus steam is discharged from the discharge port 10c.

Next, a superheated steam generator will be described.
The superheated steam is obtained by generating water vapor with the steam generator 20 and heating the steam with the steam superheater 21 provided with a heater 21c therein.
In the steam generator 20, a heater 20c is disposed in a container 20a that is heat-insulated and sealed.
Water is supplied into the container 20 a through the electromagnetic valve 25, the flow meter 24 and the liquid level meter 23.
When the water is heated by the heater 20c and boiled, water vapor is generated in the container 20b and sent to the steam superheater 21 through the pipe 20d.
In the steam superheater 21, a heater 21 c is disposed in a container 21 a that is kept warm, and the steam fed into the container 21 b is superheated to 300 ° C. or more, preferably 400 to 550 ° C. 10 is supplied.
The temperature of the superheated steam is detected and controlled by the temperature sensor 21d.
In addition, it has a bypass pipe 20e for feeding normal steam of 150 ° C. or lower and a switching valve 20f such as an electromagnetic valve for cooling after the coffee beans are roasted.

Using the roasting apparatus shown in FIG. 1, coffee beans were charged into the bean ware container 11, superheated steam at about 500 ° C. was supplied into the vessel, and the coffee beans were roasted for about 5 to 6 minutes.
Next, after cooling the coffee beans with ordinary steam for about 1 minute, the coffee beans were taken out from the vessel.
When this coffee bean was used to extract coffee, it became fruity and well-flavored coffee.

DESCRIPTION OF SYMBOLS 10 Roasting machine 11 Bean roasting container 12 Heater 13 Ceramic body 20 Steam generator 21 Steam superheater

Claims (3)

A roasting machine is equipped with a bean ware container,
A far-infrared generator that irradiates far-infrared rays toward the bean-baked container for roasting coffee beans, and a steam superheater that supplies superheated steam of 300 ° C. or higher into the vessel ,
Having a steam generator for generating normal steam at 150 ° C. or lower,
Switching means between a state in which the steam generator is connected to the steam superheater and a state in which the steam generator is directly connected to the inside of the device;
The cooling after roasting the coffee beans with the superheated steam can be performed in a reducing atmosphere without switching to the normal steam at 150 ° C. or less from the superheated steam and exposing to the atmosphere . Roasting equipment.   The roasting apparatus according to claim 1, wherein the far infrared ray generator is a ceramic body. After the coffee beans are roasted by superheated steam of 300 ° C. or higher and irradiation with far infrared rays, the coffee beans are cooled as they are with normal steam of 150 ° C. or lower as they are in a reducing atmosphere without being exposed to the atmosphere. How to roast coffee beans.

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