Why does a hand grinder have more fine powder than an electric grinder?

Grinding coffee beans into powder, whether it is the use of tens of thousands of yuan of high-quality bean grinder, or hundreds of pieces of entry-level bean grinder, the emergence of fine powder is inevitable at present. However, the amount of fine powder will have an impact on our cooking, making it unstable. The choice of bean grinder can reduce our worries about fine powder to a certain extent. On this basis, Qianjie compares the difference between electric mill and hand mill in the production of fine powder, so that we can understand their differences in grinding function.

Generally speaking, our common hand bean grinder on the market uses a conical cutter head, while the electric bean grinder mostly uses ghost tooth cutter head or flat knife cutter head. Therefore, the hand grinder with conical cutter head in the front street is compared with the electric bean grinder with flat cutter head.

Grind 10 grams of beans with hand mill and electric mill respectively (the test uses deep-baked gold manning), the grinding degree is 80% of China 20 standard sieve, put the ground beans into the sieve, gently shake the powder, and finally weigh and compare the very fine powder.

Hand grinder: very fine powder 1.6g

Flat knife electric grinder: very fine powder 0.9g

So when the same type of coffee beans are grinded with the same degree of grinding, the hand grinder does have more fine powder than the electric grinder.

This is due to the design problem of the grinding disc. The conical cutter head is usually composed of a circular static cutter head and a conical moving cutter head. The caliber of the conical cutter head is getting narrower and narrower from top to bottom, which will affect a certain degree of uniformity and make it easier to produce very fine powder.

The structure of the electric flat knife bean grinder is that the upper and lower cutters are placed in parallel, one is fixed on the fuselage, the other rotates with the motor, and the coffee beans are ground into powder with centrifugal force and discharged from the gap between the cutters. Coffee beans are crushed for a shorter time than a tapered cutter head, resulting in relatively less fine powder. And with the help of the motor, human error is reduced, coffee beans can be ground at the same speed, which means a more uniform grinding effect.

So, if you find that your bean grinder produces too much fine powder, you can do an extra effort: sift out the fine powder. Then add some of the sifted fine powder back, so as to reduce the amount of fine powder and retain the flavor of fine powder.

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