How to choose the advantages and disadvantages of the flat knife, cone knife and ghost teeth of the bean grinder?

What is a bean grinder

First of all, we need to know that all the aromas and flavors of coffee are wrapped in coffee beans. If we use the whole coffee bean to extract the coffee, there is no way to extract the flavor components of the coffee! Or very few. Only to grind the coffee into powder according to different brewing methods, extraction is the best respect for coffee!

So the question is, why don't we just buy ground coffee powder? In fact, coffee is a very glass-hearted person, can not be destroyed! Because it is volatile.

When we pour the coffee beans into the grinder and start grinding to produce heat, 70% of the aroma has evaporated. So generally, in order to keep the coffee beans absolutely fresh, we only start grinding the coffee beans before making them (and it is better to make the coffee within 2 minutes, otherwise the coffee powder will be left in the air for 15 minutes. The aroma has basically evaporated) so we do not recommend buying ground coffee powder.

There are several kinds of bean grinders

Ka friends all know such a common sense, if we cook a dish at home. Cut the meat into big pieces, small pieces, thick pieces and thin pieces. Then some of the fried dishes are either burnt or undercooked! So it's important to cut the meat evenly.

By the same token, one of the hard indicators of the coffee grinder is: uniform! Even! Even! Therefore, at present, coffee beans are ground into coffee powder, there are three grinding methods on the market: ghost teeth, flat knife, cone knife; according to different requirements, can be divided into manual and electric.

What are the characteristics of different grinding methods

We need to know that there are many factors that affect the performance of the bean grinder, such as rotational speed, cutter head material, knife shape, grinding speed and so on. Today we will mainly talk about the respective characteristics of the cutter head.

Characteristics and movement mode of flat knife grinding

The operation principle of the flat knife bean grinder is composed of the upper and lower cutter head, and the base is fixed on the motor. When the motor starts, it rotates the upper and lower cutter head to produce cutting action. When the coffee particles fall from the middle, the knife head rotating at the bottom will spin the coffee beans to the outside and push the coffee beans into the tooth cutter part for grinding.

The upper and lower cutters of the flat knife are placed in a parallel manner, so the coffee beans need to rely on the rotating force of the bottom cutterhead to push the coffee beans into the cutterhead, so the weight of the coffee beans placed on the top will affect the uniformity of the coffee beans entering the knife cutter. in addition, due to pushing, the number of collisions between coffee beans increases, resulting in an increase in the proportion of fine powder. This is the reason why the particle uniformity of the common flat knife bean grinder is slightly worse and the fine powder is more. Increase the concentration and extraction rate of coffee in a short time, so that the aroma of coffee can be significantly improved in a short time.

At the same time, because the shape is long and the volume is smaller, when the extraction time becomes longer, the granular xylem will absorb too much water, resulting in increased miscellaneous flavor and astringent taste. At present, it is widely used in Italian bean grinder, and there are also single bean grinders (such as small Fuji, Pegasus).

Characteristics and movement mode of tapered cutter grinding

The conical knife grinder places a conical cutter head at the bottom and then grinds it with the outer ring cutterhead. After the coffee bean falls from above, it will pull the coffee bean down with the rotation of the conical cutter head, resulting in grinding action, also because it is from top to bottom. Therefore, the particles do not need to push the coffee out, compared with the peace knife bean grinder, the number of collisions between the particles will be much less, so the proportion of fine powder produced by the cone knife will be much less than that of the flat knife, and the uniformity of coffee grinding will be greatly improved.

The cone knife grinding particles will be nearly granular, resulting in a longer water absorption path of coffee particles, and it will take longer for the interior to come into contact with water, so the cone knife particles will release less soluble matter at the initial stage, resulting in a low concentration in a short period of time. At the same time, because the shape is granular, even if extracted for a longer time, the xylem absorbs less water and is less likely to produce miscellaneous and astringent taste. At present, the hand grinding machines on the market are cone knives, and the effect is good, but also easy to carry, the only disadvantage is that hand grinding is exhausting!

Characteristics and Motion Mode of Ghost Tooth Grinding

The operation mode of the ghost tooth bean grinder is similar to that of the flat knife bean grinder. The coffee bean falls above and pulls the coffee bean down with the rotation of the knife. The particles do not need to be pushed and squeezed, and the peace knife is much less fine powder, but the coffee powder particles are closer to the circle, and the proportion of coarse powder and fine powder is more uniform, so the coffee taste is cleaner, and the flavor is more three-dimensional, full and comprehensive.

How to choose a bean grinder that suits you better?

1. When you need to get a high concentration of coffee in a short time, the flat knife grinder is a good choice, and the high concentration will also make the aroma rich, so the aroma of using a flat knife will be much more obvious than that of a cone knife. The famous bean grinder EK43 is a flat knife.

2. When better taste is needed, the granular coffee powder produced by the cone knife can reduce the xylem contact time. Although the aroma is not as obvious as the flat knife, the taste is still better even if the extraction time is prolonged. The famous hand bean grinder German commander c40 is.

3. The performance of the ghost tooth bean grinder is the best, and the flavor of the product is more moderate. In addition to the key factor of evenness, the ghost tooth bean grinder is more suitable for testing the flavor of coffee beans.

The bean grinder is the most expensive of all the equipment. As long as you have tasted freshly ground coffee, you never want to go back. Good maintenance, a bean grinder for more than 5 years is not a problem.

In addition, the quality of the motor horsepower of the bean grinder is also very important. at present, the domestic market is ushering in the wave of fine coffee. Coffee beans are generally roasted shallower, coffee beans are relatively hard, and if the motor horsepower is not enough, it is easy to get stuck. Can not grind (improper operation is also easy to produce stuck beans).

The article comes from broken coffee.