JPH104881A - Roasting of coffee bean - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for roasting raw coffee beans in shorter time with reduced heat consumption compared with conventional roasting process and giving roast coffee beans having unique straight taste and flavor. SOLUTION: A container such as a drum 1 is charged with a mixture of raw coffee beans and a heating medium consisting of pebbles, ceramic grains or metallic particles or a mixture of two or more of the above substances. The mixture is heated with a heat-source such as a gas burner 2 under stirring. The roast coffee beans are discharged from a discharging hole 5 and the heating medium is separately discharged from a discharging hole 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a method for roasting green coffee beans.

[0002]

2. Description of the Related Art Conventionally, green coffee beans are put in a drum,
While rotatably stirring the inside of the drum, it is roasted by heating with a gas burner from below the drum.

[0003]

SUMMARY OF THE INVENTION In a shorter time than before,
There is a need for a method that can be roasted with low heat consumption, and the present invention solves such a demand, and provides a roasting method in which roasted coffee beans have a unique sharp taste and aroma. Aim.

[0004]

Means for Solving the Problems In a heating vessel, any one of pebbles, ceramic grains or metal grains, or a heating medium formed by mixing any of them, and coffee green beans are mixed and stored. After heating the mixture with stirring,
Separate the roasted coffee beans from the heating medium.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The roasting method according to the present invention uses a pebble, ceramic particles, iron,
Mix the green coffee beans with one or more of two or more mixed heating media of metal particles such as aluminum, and stir the inside of the drum 1 with a stirrer. It ignites, heats the heating medium in the drum with the gas, and roasts the coffee beans with the heated heating medium. Instead of stirring the inside of the drum 1 with a stirrer, the drum may be rotated to stir the green coffee beans in the drum.

If the heating medium has a larger grain size than the green coffee beans, it is preferable because it can be easily separated from the green coffee beans after roasting described later. The mixing ratio of the heating medium and the green coffee beans is not limited, but is preferably a ratio of 1: 2.

When the heating medium is heated by the gas burner 2, the heating medium in the drum 1 is heated first, and strong infrared rays are generated from the heating medium. According to experiments, conventional roasting requires about 15 minutes, but the method of the present invention can be roasted in about 8 minutes. In addition, the infrared rays delicately act on the green coffee beans to obtain roasted coffee having a unique sharp taste and aroma that cannot be obtained by the conventional roasting method.

When the roasting is completed, the coffee beans and the heating medium are separated by the separator 3. The separation method is to use a difference in grain size between the roasted coffee beans and the heating medium to separate them with a net, or to use the difference in weight between the roasted coffee beans and the heating medium. Using a vacuum pump, roasted coffee beans are sucked up in a duct and separated. In FIG. 1, a separator 3 for separating by a net is provided in addition to a heating device, 4 is a discharge hole for a heating medium, and 5 is a discharge hole for roasted coffee beans.

In the case of roasting, instead of using the drum 1, an apparatus having a stirrer inserted from above in a container having an open top may be used.

[0010]

According to the method of the present invention, the roasting can be performed in a shorter time than the conventional roasting method, and the heat consumption can be reduced.
Roasted coffee with a unique sharp taste and aroma can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a roasting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum 2 Gas burner 3 Separator 4 Heating medium discharge hole 5 Roasted coffee bean discharge hole

Claims (1)

[Claims] In a heating vessel, any one of pebbles, ceramic grains or metal grains, or a heating medium obtained by mixing any of them, and green coffee beans are mixed and stored, and the mixture is stirred. A method for roasting coffee beans, comprising separating the roasted coffee beans from a heating medium after heating while heating.