Differences of cutter heads of different bean grinders and analysis of their advantages and disadvantages
For professional baristas, please follow the coffee workshop (Wechat official account cafe_style)
The bean grinder is generally divided into three kinds: flat knife, cone knife and ghost tooth.
* flat knife: coffee bean grinding, flaky appearance, composed of upper and lower cutters, fixed motor base, rotating cutter head to cut coffee beans
Flavor: strong, single, obvious aroma
Advantages and disadvantages: the upper and lower cutters are placed in parallel, and the coffee beans are pushed forward by the rotating force of the bottom cutter head for grinding. Therefore, the weight of the coffee beans above will lead to the uniformity of coffee beans into the knife plate. Due to the increase in the proportion of fine powder when the coffee beans are pressed, the proportion of fine powder is also increased, but the flat knife is flaky, so the area of the cell wall is large, so the coffee concentration and extraction rate can be increased in a short time. Aroma increased in a short time. Due to the small size of the flat sheet, the xylem extracted for a long time is easy to precipitate into too much water to produce miscellaneous flavor and astringent taste.
* Cone knife: coffee beans are ground by grinding, the shape is block, the cutter head is placed at the bottom, and grinding is carried out by the outer cutter head.
Flavor: round and complex
Advantages and disadvantages: the coffee beans fall from the top, and the coffee beans are pulled down for grinding with the rotation of the cutter. The particles do not need to be pushed and the fine powder is much less than the flat knife, and the grinding degree is higher than that of the flat knife. The cone knife is close to granulation, which leads to a longer water absorption path and longer exposure to water, so the initial release of soluble matter, less Nongdu, will be too high, but it is not easy to produce miscellaneous flavor and astringent taste when the xylem absorbs less water for a long time.
* Ghost teeth: coffee beans are ground in a round shape
Flavor: clean, three-dimensional and full
Advantages and disadvantages: the ghost tooth cutter head can grind uniform coffee powder, and the fine powder has less grinding efficiency. Due to the average ratio of coarse powder to fine powder
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