Friends who like to make freshly ground coffee by themselves know that the biggest classifications in the field of grinders are manual and electric. electric grinders are efficient, fast, and labor-saving, but they are not easy to carry, rely on power supply, and are often bulky. hand grinders are small, portable, and generate little heat. Grinding by yourself is a unique experience. No one can replace the electric grinder or the hand grinder, but many people still have a soft spot for the hand grinder.
We all know that the finer the ground coffee particles, the greater the surface area in contact with water; the coarser the ground coffee particles, the smaller the surface area in contact with water.
When factors such as extraction time, temperature, water, and method remain unchanged, due to the larger contact area, the extraction rate of fine powder will be higher and the extraction rate of coarse powder will be lower.
During the same extraction process, if the grinding thickness of the coffee powder is too different, the coffee produced may be under-extracted and over-extracted at the same time, which is frustrating. If the extraction state of each coffee powder is different, the taste will be too complex.
The key to determining uniform grinding is whether the concentricity of the grinding center of the grinder is good enough. Coffee powder is obtained by staggered grinding of internal and external grinding cores. If the fixed structure is not precise enough, the distance between the inner and outer grinding centers will keep changing during rotation, and the ground powder will be coarse and fine.
No matter what kind of coffee beans grinder is used, extremely fine powder will be produced, which is determined by the physical structure of the coffee beans themselves. It’s just that different grinders produce different amounts of fine powder, but generally there is more than 10% fine powder. Therefore, the quality of a hand grinder is directly reflected in whether the grinding degree is uniform and the fine powder rate.
Compared with electric grinders, hand grinders are not restricted by the venue and are indeed a good choice, but they are relatively laborious to use, especially for girls. So when choosing a hand grinder, you need to consider whether it is comfortable to use and whether it allows you to grind coffee beans easily.
Depending on the degree of roasting and extraction tools, the grinding degree is also different. The thickness adjustment valve of some hand grinders is easy to adjust during grinding, which will cause uneven grinding. Therefore, when choosing a hand-ground coffee machine, you must choose according to your actual needs.
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