JP2002159283A - Roasting method and roasting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roasting method and a roasting apparatus both easily and finely adjusting the roasted condition of a product to be roasted. SOLUTION: This roasting method is characterized by comprising heating a product to be roasted in a heating boiler followed by evaporating the water content thereof and heating the product to be roasted with heating value lower compared to that before evaporating the material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roasting method and a roasting apparatus, and more particularly, to a roasting method and a roasting apparatus for an object to be roasted such as coffee beans.

[0002]

2. Description of the Related Art FIG. 4 is a graph showing an example of the relationship between time and temperature in a conventional method for roasting coffee beans, which is the background of the present invention. In this graph, Tr is room temperature, Ta
Indicates a first target temperature, Tb indicates a second target temperature, and Tc indicates a removal temperature. t indicates time. Here, the first target temperature Ta is a temperature at which the moisture of the coffee beans as the roasted material completely evaporates, and is a temperature of 100 ° C. or more and less than Tb. Next, the second target temperature Tb is a temperature at which roasting of coffee beans is completed, and is a temperature related to roasting control. That is, when roasting is performed until the second target temperature Tb becomes relatively high, the roasted color becomes a deep roasted and bitter french roast, and when roasted at a relatively low temperature, the roasted color is light or medium roast having a strong sourness. State. The roasted coffee beans are taken out of the heating pot of the roasting device at a point in time when the take-out temperature Tc has elapsed after a predetermined time has elapsed.

[0003]

However, in such a conventional roasting method, the temperature from room temperature Tr to 100 ° C.
Up to the above-mentioned first target temperature Ta, since coffee beans as roasted materials contain moisture, most of the heat generated by the heating means is consumed to evaporate the moisture. However, when the coffee beans exceed the first target temperature Ta, the moisture evaporates and the coffee beans are completely dried, so that most of the heat generated by the heating means is added to the coffee beans, and the temperature rise rate of the coffee beans decreases. Be faster. As a result, since the coffee beans reach the second target temperature Tb in a short time from the first target temperature Ta, it is difficult to adjust the amount of heat to obtain a good roasting condition, and the coffee beans are over-burned and burnt to the center. In some cases, the fire did not pass sufficiently, and fine adjustment of the roasting condition was difficult.

[0004] Therefore, a main object of the present invention is to provide a roasting method and a roasting apparatus which can easily finely adjust the degree of roasting of a material to be roasted.

[0005]

According to the roasting method of the present invention, after the material to be roasted is heated in a heating pot to evaporate water, the material to be roasted is heated at a lower calorific value than before the water evaporation. Is a roasting method characterized by heating.

Further, in the roasting method according to the present invention, the roasting object is heated by the heating means to the first target temperature, and after the temperature reaches the first target temperature, the output of the heating means is reduced. Roasting, comprising: successively heating the to-be-roasted material to a second target temperature higher than the first target temperature; and stopping the heating by the heating means after reaching the second target temperature. Is the way.

[0007] In the roasting method according to the present invention,
Preferably, the first target temperature is a temperature for evaporating water, and the second target temperature is a temperature for completing roasting of the roasted material after the water evaporation.

Further, in the roasting method according to the present invention, after the temperature reaches the second target temperature, the heating by the heating means is stopped, the roasted material is cooled by the cooling means, and then the roasted material is heated by the heating pot. It is preferable to include a step of taking out from a room temperature atmosphere.

Further, the roasting apparatus according to the present invention comprises a heating pot for holding and heating the roasted material, a heating means for heating the heating pot, and a stirring device arranged in the heating pot for stirring the roasted material. Means, temperature measuring means for measuring the temperature of the heating pot, cooling means for cooling the roasted material in the heating pot, and opening and closing provided at the bottom of the heating pot to take out the roasted material after the roasting is completed. A roasting apparatus including a mouth, and further heating the heating kettle to a first target temperature by the heating means while stirring the roasted object held in the heating kettle by the stirring means. The output of the means is reduced, and the heating pot is continuously heated to the second target temperature. After reaching the second target temperature, the heating by the heating means is stopped, and the cooling of the roasted material by the cooling means is started. After cooling to a predetermined temperature, open and close the opening to take out the roasted material. Including Gosuru control means, a roasting apparatus.

In the present invention, after the water evaporation, the amount of heat is reduced and roasting is performed, so that the time until roasting is increased and fine adjustment of the roasting step is facilitated.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the accompanying drawings.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a schematic perspective view showing a roasting apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an electric connection state thereof. The roasting method and the roasting apparatus according to the present invention can be applied to peanuts, soybeans, ginkgo, chestnuts, and all other crops that can be roasted. explain.

The roasting apparatus 10 according to the present invention comprises a housing 34.
including. Inside the housing 34, the heating pot 12 for holding and heating the coffee beans as the roasted material is held. An electric heater 14 as heating means is provided inside the heating pot 12,
The heater 14 heats the heating pot 12 and the coffee beans held therein by far infrared rays. A lid 32 is openably and closably placed on a bean charging port opened at an upper portion of the heating pot 12. A vent 32a for discharging water vapor and smoke is provided near the lid 32.

In the heating pot 12, a stirring blade 16 is rotatably arranged. The stirring blade 16 is driven by a stirring motor 18 and constantly stirs the coffee beans in the heating pot 12.

The heating pot 12 is provided with a temperature sensor 20 as a temperature measuring means. In this embodiment, the temperature of the heating pot 12 is measured, and control described later is performed based on the measured value. However, it goes without saying that the temperature of the coffee beans themselves may be measured.

An opening 24 for taking out coffee beans after roasting is provided at the bottom of the heating pot 12. The opening / closing opening 24 is opened and closed by a solenoid 26, closed during roasting, and opened after roasting is completed.

Further, after the roasting apparatus 10 stops heating,
Including a cooling device as a cooling means for forcibly and rapidly cooling the coffee beans. As the cooling device, for example, means for rotating a cooling fan (not shown) by the cooling motor 28 and blowing air toward the coffee beans in the heating pot 12 is used.

A power switch, a start switch 38, a forcible exclusion switch 40, an automatic operation display lamp 42, a start possible display lamp 44, a roasting degree adjustment knob 46, and the like are provided on the wall surface of the housing 34. The forced exclusion switch 40 is a switch for forcibly opening the opening 24 and taking out coffee beans after cooling to a predetermined temperature or lower. Also,
In this embodiment, for example, a stepless changeover switch is used as the roasting degree adjustment knob 46.

Further, the roasting device 10 has a signal switching circuit 3 as a control device electrically connected to each component.
Contains 0. The signal switching circuit 30 is formed of, for example, a gate circuit, but may be controlled by a microcomputer.

Below the opening 24, a bean receiving cup 48 is provided.
Is arranged. In the bean receiving cup 48, a bean receiving wire net 50 is provided.
Is held. The roasted coffee beans are dropped onto the bean receiving wire net 50 from the opening / closing opening 24. At this time, beans (chaff) and the like fall from the mesh of the wire netting 50, and only coffee beans are sieved.

Next, the operation of the roasting apparatus 10 will be described. When the outlet is connected to a 100V power supply and the power switch is turned on, the start enable lamp 44 is turned on. When coffee beans as a roasting object are put into the heating pot 12 and the start switch 38 is pressed, an automatic operation display lamp 42
Lights up, stirring by the stirring blade 16 is started, and heating by the heater 14 is started. Then, the heating pot 12 is heated by the heater 14 to the first position shown in FIG.
Heating is performed with a preset amount of heat until the temperature reaches the target temperature Ta. Here, the first target temperature Ta is 15% by weight.
This is the temperature at which the water content of the coffee beans contained by about% is completely evaporated and removed. The first target temperature Ta fluctuates depending on the ambient air temperature or the like.
Is set to

When the temperature of the heating pot 12 becomes higher than the first target temperature Ta, the output of the heater 14 is reduced more than at the beginning of heating in order to facilitate the adjustment of the degree of roasting by reducing the temperature rise and roasting speed. The coffee beans are heated with a lower calorific value than before the evaporation of water.

When the heating pot 12 reaches the second target temperature Tb, the heating by the heater 14 is stopped. The second target temperature Tb is a temperature at which coffee beans are roasted. For example, the temperature is set at around 160 ° C. when the roasting is moderate, and is set at around 180 ° C. when the roasting is deep. The set temperature is set in advance by the roasting degree adjusting knob 46 to an appropriate temperature in view of the state of roasting.

After the heating pot 12 reaches the second target temperature Tb and the heating by the heater 14 is stopped, a cooling fan is driven by a cooling motor 28 as a cooling device to cool the roasted coffee beans. Then, after the coffee beans are cooled to the third target temperature (extraction temperature) Tc, the opening / closing port 24 is opened by the discharge solenoid, and the coffee beans are dropped on the bean netting 50 in the room temperature atmosphere. Third target temperature T
c is, for example, around 50 ° C to 60 ° C. Thus, by rapidly cooling with the cooling device, high-quality roasted coffee beans having good taste and aroma can be obtained. In this embodiment, the temperature of the heating pot 12 or the coffee beans is measured and cooled, and the discharge solenoid is driven when the temperature reaches a predetermined temperature. However, the present invention is not limited to this, and the forced cooling time is controlled by a discharge timer. It may be.

According to the roasting apparatus 10, after water evaporation,
Since the roasting is performed by lowering the calorific value, as shown in FIG. 3, the slope of the temperature rise until the roasting after water evaporation becomes smaller than before, and the time until the roasting (t ₂ -t ₁ ) is reduced. It can be longer than before. Therefore, this roasting device 10
In this method, fine adjustment of the roasting step is facilitated. If the roasting temperature after water evaporation is low, lightly roasted beans can be obtained, and if it is high, deeply roasted beans can be obtained. In this example, the raw beans 20
Under the conditions of 0 g, 100 v and room temperature of 20 ° C., the total roasting time t ₂ is about 15 to 20 minutes, and the cooling time (t ₃ −t ₂ ) is about 5 minutes.

The heating means is not limited to an electric heater, and may be heated by, for example, gas fire or charcoal fire.

[0027]

According to the present invention, after water is evaporated, the amount of heat is reduced and roasting is performed, so that the time until roasting is increased and fine adjustment of the roasting step is facilitated. In addition, since the heat is reduced and heated after the first target temperature, there is no danger of burning the roasted object even when roasting with a higher heat than before until the first target temperature. Can also be shortened.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical connection state of the roasting apparatus shown in FIG.

FIG. 3 is a graph showing a relationship between roasting time and temperature by the roasting apparatus shown in FIG.

FIG. 4 is a graph showing a relationship between time and temperature according to a conventional roasting method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Roasting device 12 Heating pot 14 Heater 16 Stirring blade 18 Stirring motor 20 Temperature sensor 24 Opening / closing port 26 Solenoid 28 Cooling motor 30 Signal switching circuit 32 Lid 32a Vent hole 34 Housing 36 Power switch 38 Start switch 40 Forced exclusion switch 42 Automatic Operation indicator lamp 44 Startable lamp 46 Roasting degree adjustment knob 48 Bean receiving cup 50 Bean receiving wire mesh

Claims (5)

[Claims] 1. A roasting method comprising: heating a roasted material in a heating pot to evaporate water, and then heating the roasted material with a lower calorific value than before water evaporation. . Heating the roasted object to a first target temperature by a heating means; and reducing the output of the heating means after the temperature reaches the first target temperature, thereby continuing the roasted material. Roasting method, comprising: heating the second target temperature to a second target temperature higher than the first target temperature; and stopping the heating by the heating means after reaching the second target temperature. 3. The first target temperature is a temperature for evaporating water, and the second target temperature is a temperature for completing roasting of the roasted material after the water evaporation. The roasting method according to 1. 4. After reaching the second target temperature and stopping the heating by the heating means, the roasted material is cooled by a cooling means, and then the roasted material is heated from a heating pot to a room temperature atmosphere. The roasting method according to claim 2 or 3, further comprising a removing step. 5. A heating pot for holding and heating the roasted food, a heating means for heating the heating pot, a stirring means disposed in the heating pot for stirring the roasted food, and measuring the temperature of the heating pot. A roasting device including a temperature measuring means for cooling, a cooling means for cooling the roasted material in the heating pot, and an opening / closing port provided at the bottom of the heating pot for taking out the roasted product after roasting is completed. Further, while the roasted object held in the heating pot is stirred by the stirring means, the heating pot is moved to the first position by the heating means.
After heating to the target temperature, the output of the heating means is reduced, the heating pot is continuously heated to the second target temperature, and after reaching the second target temperature, the heating by the heating means is stopped. Control means for controlling each of the means for starting the cooling of the roasted material by the cooling means, opening the opening / closing opening and taking out the roasted material after being cooled to a predetermined temperature, Brewing equipment.