How to choose the bean grinder so that the flavor of coffee beans is not discounted?

For coffee, I just want to say that it is an extremely arrogant being. From the selection of beans to baking, grinding and final brewing, there is not a single step that needs to be treated carefully. The best drinking time for roasted coffee beans is less than a month, and the time after grinding into powder is even shorter, and the best flavor can be felt only in a few minutes. So if you want to drink coffee better, a bean grinder is very necessary.

But is it all right to have a bean grinder? If you pick the wrong type, the flavor of coffee will still be greatly reduced!

What kind of bean grinder is good?

An excellent bean grinder is probably uniform grinding, less heat friction and less fine powder. But in fact, there is no absolutely uniform grinding machine, no matter how the machine, can not avoid the production from fine powder to coarse powder, a good machine can only say that the proportion of grinding powder is relatively stable. In fact, even if there is an absolutely uniform machine, due to the thickness of the coffee powder is too single, the extraction will inevitably lose the flavor, the taste will become relatively flat, may not be very good.

Since coffee powder grinding can be divided into thick and thin, when should it be thick and when should it be fine? In fact, this is related to the extraction method, you can roughly refer to the following picture:

Therefore, the bean grinder of good espresso may not be able to grind the coffee powder suitable for a single product, and the judgment of the bean grinder depends on what kind of coffee powder you need. Let's take a specific look at how to choose a bean grinder that suits us.

Manual vs electric

From the point of view of the mode of operation, the bean grinder is divided into manual type and electric type, both of which have their own advantages and disadvantages.

The price comes from JD.com search, electric automatic filter blade type "bean grinder", the reason will tell you later.

Generally speaking, the hand-operated bean grinder is relatively small, does not have to rely on power supply, can be ground wherever you go, it is quite convenient to travel, and the fine powder produced by the electric mill will be relatively less.

However, because it needs to be carried out manually, it is more time-consuming and laborious, and the ground coffee powder is easy to be uneven, thus affecting the effect of extraction. Therefore, the coffee powder grinded by hand is more suitable for hand brewing, siphon kettle, pressure kettle and other similar brewing methods, if used in Espresso may not be very good. In addition, for girls with insufficient arm strength, it is better to skip it and take a look at the electric bean grinder.

The electric bean grinder is very labor-saving, and you can wait for the powder to come out at the press of a button. And the stability of the better machine powder is very guaranteed, whether the coffee powder requires a higher degree of uniformity of Espresso, or hand-made this kind of cooking method, the electric bean grinder can hold live.

In the end, the choice of hand-type or electric type can actually see their own preferences, hand-shaking is more retro feelings, buy home can also be used as decorations; electric type is faster and more convenient. However, for the bean mill, in addition to the mode of operation, the structure of the grinding plate is also very important.

Like to drink Italian or individual products, the choice of grinding plate is different

How important is the structure of the grinding plate to the bean mill? It will directly affect whether the bean grinder is suitable for single product or Italian style, the shape of coffee powder, the number of fine powder, and so on.

Blade chopper: please make a detour if you see it.

The shape of the grinding plate can be roughly divided into four kinds, and this kind of blade is the least recommended!

Bean chopping machine

Blade type refers to this kind, which is more suitable for grain spice grinding.

First, the coffee powder "chopped" is seriously uneven; second, the blade will produce very high heat in the grinding process, which will destroy the precious oil and aroma of coffee beans; third, this product can not adjust the thickness at all! How can we buy this kind of machine to spoil beans when we start to grind beans by ourselves?

Ghost tooth grinding plate: the first choice for individual coffee at the entry level.

Compared with the way espresso is brewed, the water flow of single coffee is smaller and slower, and there is no high-pressure effect, so the coffee powder is required to be relatively coarse, while the bean grinder on the ghost tooth grinder can be better qualified for this.

Ghost tooth grinding particles are relatively round, although there will be fine powder, but the proportion is OK. After brewing, the taste of the coffee will be clean and three-dimensional, and the flavor has a good sense of balance and thickness, but the performance of the details is not so good.

Flat knife grinder: Italian single product and two-pronged approach

The flat knife grinder has the largest market share in the bean grinder market, and different lines suitable for Italian style and individual products have been derived from the same style. So no matter what kind of coffee you drink, you can find a suitable bean grinder in the flat knife grinder.

The grinding plate of the flat knife grinder is composed of the upper and lower cutters, placed in a parallel way, and is ground by "cutting", so the coffee powder is flaky. In this way, the contact area increases, so that the concentration and extraction rate of coffee liquid are improved, and the aroma will be better.

Of course, the flat knife bean grinder also has some obvious shortcomings. The first is uniformity. The working mode of the flat knife bean grinder is that the coffee beans fall from the middle to the cutter head, and the knife head rotates to push the beans to the outside for grinding, that is to say, the weight of the upper coffee beans will give a force to the lower layer to promote the grinding process, but the top beans do not have this treatment, and the grinding effect of the upper and lower layers is a little poor. Secondly, this grinding method will lead to an increase in the proportion of fine powder, which needs to be screened well.

Conical bean grinder: swing fraternity party

If you are deeply in love with both individual coffee and espresso, or are not sure if you will change your taste and fall in love with another kind of coffee, you can consider getting a cone grinder, whether it is a thicker particle for a single product or a fine powder for Italian style. Cone grinder can do it.

The tapered cutter head is divided into two parts: the inner grinding core and the outer grinding core. When the coffee beans fall behind from the top, they will rotate with the cutter head and be pulled down to grind them. Therefore, there is no action to push the coffee beans out. Compared with the flat knife grinder, the proportion of fine powder will be less and the uniformity will be higher.

However, a problem with the tapered bean grinder is that although it can grind the finer coffee powder needed by the Italian style, it is easier to produce fine powder, and it is not as efficient as when grinding coarse powder, and the noise will be louder.

At present, the tapered bean grinders on the market are relatively polarized, either high-priced top products or low-end entry-level products. In addition, because of its high grinding efficiency, it is more common in hand bean grinders.

Ceramic grinding disc VS metal grinding disc

No matter what kind of grinding plate structure, there is the problem of material selection, whether to choose ceramic movement or metal movement? Generally speaking, they each have their own advantages.

Ceramic grinding disc: low grinding efficiency & low heat production

Ceramic grinding plate due to material reasons, its hardness is relatively high, and wear-resistant is not easy to generate heat, can better retain the flavor of coffee, cleaning is also very convenient, can be directly washed with clean water. But its texture is relatively brittle, making the core or cutter head will not be very sharp, otherwise the blade is easy to break, so it is mainly through extrusion rather than cutting, the fine powder may be more, and the efficiency is a little low.

Metal grinding disc: high grinding efficiency & high heat production

Compared to the metal grinding plate will be much sharper. It grinds the coffee beans into coffee powder by cutting, and the grinding quality is better; but because of the material, if the rotational speed is too high or it is used for a long time, it is easy to get hot, and the coffee powder will accelerate its oxidation if heated, resulting in aroma volatilization and affecting the flavor of the final coffee. In addition to changing the material, the manufacturer will also increase the diameter of the grinding plate to reduce the number of rotary grinding, so as to prevent the temperature from rising too high. But in this way, the machine occupation area will be too large, so there are more commercial models. Coffee industry exchanges, please add privacy.

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(long press copy)

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