Roaster detailed explanation of coffee bean roasting process

Classic elements are used in the design of the fuselage. Simplicity, industry and science and technology are the elements that you want to express.

Fengmen chapter

The design of the throttle here follows the D type, which is still controlled by 100 gears of infinitely precise control. when the roaster is working, the air expansion caused by gas combustion or electric heating will naturally produce a positive pressure in the furnace. the function of the exhaust system is to draw hot air and baking smoke out of the inner pot to form flowing hot air to heat the coffee and take away the silver skin. When the exhaust air volume regulated by the throttle is lower than the positive pressure, it is often referred to as the steaming state. On the R500 series, this adjustment value is a 30-gear throttle. When the sampling spoon is pulled out from the mouth of the sampling spoon, it will be found that the lighter flame is neither inhaled nor blown off at this value. Another detection method is to turn on the lower bean switch, and the hand can not feel the hot air up at the lower bean switch, which means that the exhaust volume of the air valve has reached a balanced state.

The reason for introducing these two ways is that the air pressure is different in different places and different seasons, and there will be a slight change. The friends of San Douke can make appropriate adjustments according to this.

To sum up, it is steaming below 30, and 30 is adjusted up according to the smoke discharge. An important index about the smoke discharge is the comparison between the rising speed of exhaust air temperature and the rising rate of bean temperature.

A general rule is that the exhaust temperature rises faster than the bean temperature, the beans will taste clean but the flavor will be weak, the exhaust temperature will rise more slowly than the bean temperature, and the beans will have a stronger flavor but more muggy smell.

Inner pot piece

The choice of the material of the inner pot is the most tangled place when making the product. in the initial design, because the stainless steel material can be rolled up and welded, it is convenient to manufacture, while the cast iron material has a great initial investment, so stainless steel has become a very tempting choice. but after the test, it is found that the stainless steel inner pot can not evenly transfer heat to the whole inner pot, resulting in some points that will overheat and scald coffee beans. A good stainless steel pot is a composite structure, with more than three layers at the bottom, with an outer layer of stainless steel at the bottom, with a copper plate in the middle as an important heat conduction layer to disperse the uneven heat energy at the bottom of the pot, so that the internal stainless steel layer can be heated evenly. But this kind of technical solution is used in the inner pot of the roaster, we really can't do it.) (PS: the three-layer structure requires a large punch to integrate the structure and exhaust air. Moreover, what people do is a flat plate, and the roaster is an inner pot.)

So after spending almost all the money at that time, we made the R500 series cast iron inner pot out of cast iron, which is still in use today.

The material of cast iron made the inner pot of R500 reach the same material level as most imported models, and we were proud of it for a long time until we learned about plasma spraying technology.

Far-infrared materials are widely used in the food industry, but no one has ever tried to use it in the harsh environment of a roaster. The change of temperature difference, inner pot expansion, friction and coffee bean impact all pose challenges for us. Until we tried to use plasma spraying technology to firmly attach ceramic far-infrared materials to the inner pot, this problem was still solved. Knocking and friction will not destroy its structure.

About the use of sampling spoon

The small roaster is easily affected by the environment, the mouth of the sampling spoon will be a channel for cold air to enter when pulled out, and the proportion of such channel and intake to the whole pot will be relatively large in the model 500. therefore, when operating the sampling spoon, it is recommended to take the way in the figure, not completely pulled out, at the same time, R500 adjustable led spotlights can help you to observe the spread of the bean watch and the change of color.

Similarly, the lower glass observation window is also chamfered to 45 degrees, such details can provide a better visual experience.

Cooling piece

It is easy to cool down the beans, but it takes a few seconds for the fan to run at full speed, so it will be better to turn on the fan in advance before preparing to leave the pot.

Measurement and control section

The function description of the control system is shown in the figure. On the 500 model, it seems that only we have the strength to integrate the complete measurement and control system at all costs. The output of the temperature curve only needs a cable and is synchronized with the thermometer of the fuselage.

(PS: there is not much ridicule for those who lack arms and legs to pull wires and patches.)

If the speed of the inner pot is controlled on the left side of the machine, it will not be photographed and will be used when you see it.

In the selection of measurement and control system accessories, when we developed the products, we looked at the existing models. At that time, most of the machines were filled with 50 Taobao thermometers, 10 yuan plastic switches and toggle switches. We chose the Japanese thermometer, the German temperature probe and the control switch of the all-metal ring lamp. (the first sight of it reminds me of BMW's angel eye lights. Then I didn't hesitate to use the best timer available on the market.

Because of the deep shadow left by all kinds of shoddy products in our memory, we have not been able to use these cheap parts on our cherished products in the face of tens of times the cost (it turns out that many of our peers still do not think so at all. .

Of course, in the end, we sadly found that in the domestic market environment, Tuhao's cost will not bring Tuhao's pricing, weak to say, this sincerely hope you will understand.

The solution of our proud electric heating version is the content in the photo, just like operating the gas version, through the knob to adjust the heating power, more products on the market can only realize the switch of two or three heating pipes, that is, the electric fire control is only in third gear. PS: you can't look directly at this kind of design.

Temperature curve:

The R500 series can apply the temperature curves of most Japanese models, and the baking curves in the books on high-quality roasting techniques of famous Japanese coffee shops are basically available, and they are all very valuable. The download address is attached. Reply can be seen, hey

Tourists, if you want to view the hidden content of this post, please reply.

Firepower:

The control of firepower and throttle is the core of baking, and you can't get away with these 2.1 pots of good beans. For the control of large and small fires at different stages, it is suggested to refer to the high-quality roasting technology of famous coffee shops in Japan. Different stages require different firepower, and the slow baking technique in Japan and the fierce fire technique in Europe are also different. when we designed the R500E, we made the best preparation for both fast baking and slow baking. The four-head burners can perform stably in both large and small fires. In the test, this has a larger controllable range than the existing water heaters in the market.

In terms of the difference between fire and effect, there are such test results for reference.

(1) 10 minutes

Dry incense (1: 10): 8 (lush scent of rushes)

Sweet potato (1: 10): 8 (fragrant and melancholy with a faint smell of humilis)

Brightness (1 to 10): 1

Thickness (1 / 10): 8

Bad feeling (positive feeling 5): 1

Yes, please. 5: 2.

Overall fragrance (10murx): 4 (like the bitter sweetness of a sweet potato)

Aftertaste: after grinding the beans with a very sour nose, drink the uncomfortable sweet. . . . . . . . . .

(2) 16 points

Dry sweet potato (1: 10): 7 (except for the grass flavor with a little almond scent)

Joss-stick (1: 10): 9 (sweet and sweet without the smell of primrose)

Brightness (1 to 10): 3

Thickness (1 / 10): 6

Bad feeling (positive 5): 3 (sweet / slightly sour / a little bitter)

Yes, please. 5: 2.

Overall fragrance (10MFX): 6

After the beans are ground, there is a light sweet smell in the dried beans, and a very comfortable sweet (slightly bitter) after drinking.

(3) 18 minutes

Dried mackerel (1-10): 7 (slightly heavier than 16-minute mash and almond scented oyster)

Fragrance (1: 10): 7 (light sweet fragrance and scent of humus)

Brightness (1 to 10): 2

Thickness (1 / 10): 7

Bad feeling (positive feeling 5):-1

Thank you (Zhengzhou 5):-1

Overall fragrance (10MFX): 3

After: after the beans have been ground and tasted, the slightly sweet, bitter and uncomfortable bitterness has been drunk.

(4) 23 minutes

Dried scented oysters (1: 10): 6 (lighter than 16-and 18-minute scented herbs and almonds)

Xianxiang (1: 10): 8 (sweet)

Brightness (1 to 10): 2

Thickness (1 / 10): 7

Bad feeling (positive feeling 5): 0

Sweet (Zhengyi 5): 1 (slightly sweet)

Overall fragrance (10MFX): 4

After the bean is ground, it tastes a little bit sweet / bitter / sweet.

The gas version is the same as the electric version, the firepower can be smoothly adjusted and maintained steadily through the knob. The gas pressure gauge and the electric heating meter can accurately indicate the current firepower, and the parameters such as time, throttle, firepower and temperature are important basis for copying and baking. The R500 series can be easily copied and baked by connecting to a computer to automatically record the change of temperature over time, coupled with throttle and firepower. The new R500E design makes the body more stable and makes it easier to copy the baking process.

About maintenance:

The only thing that needs to be cleaned in the R500 series is the air valve, and we have designed the simplest smoke exhaust pipe for the R500 to reduce the condensation of grease and dust in long pipes during use. The complete R500 air valve can be easily removed by opening the two clasps on the way, and the air valve supports full washing. (PS: if you want)

About silver skin cleaning

As for the silver collector, it is explained in detail in the picture. This is the most convenient solution we know so far. Open the door, scan it, ok. And, the whole process only needs one person to operate with one hand.