The importance of uniform grinding of selected coffee four basic principles of coffee grinding

Grinding of fine coffee

The importance of uniform grinding may often be overlooked by ordinary people. So far, I have heard many versions of the saying, but generally there are wrong ideas, very few are closer to the correct saying, generally everyone will think that when grinding coffee beans into powder, the finer the grinding coefficient, the better the stronger. However, this idea is a huge "mistake", which can also be said to be one of the key factors affecting the success or failure of coffee.

So the more finely ground coffee is, the more wrong it is! And irresponsible commercial coffee talk!

Once the coffee beans are ground too fine, the "water" and the "surface of the coffee powder" contact too much, but will extract too many unnecessary impurities, and even bitter will run out.

If the coffee beans are ground too coarse, the characteristics of the coffee beans themselves are still hidden in the beans, resulting in hot water not touching the place, the brewed coffee will not have enough delicious aroma.

Generally speaking, a good grinding method should have four basic principles:

（1） The tools used should be selected to adjust the correct grinding coefficient

（2） The temperature generated during grinding is lower

（3） The ground coffee powder should be uniform

（4） Try to grind before brewing

In fact, no matter what kind of grinding machine is used, it will also generate heat due to friction during operation. Most of the excellent substances mentioned above are highly volatile, so the heat is generated during grinding, and at the same time, the speed of volatilization is increased. Therefore, the fragrance will be lost in the air.

After coffee beans are ground, the cell wall will also completely disintegrate at the same time. At this time, it will become a state of coffee powder, which will increase the contact area between coffee powder and air. Therefore, all the freshness defense lines protecting selected coffee will be completely removed. At the same time, the speed of oxidation and deterioration will also increase. Within about 30 seconds to 2 minutes, coffee will begin to lose flavor, so it is generally recommended to buy coffee beans as much as possible.

And if there is such an emphasis on grinding to the industry, will also try to take immediate grinding immediately sealed action.

Coffee pestle grinding method

Before the invention of the grinder, that is to say, humans first used pestle to grind coffee, using stone pestles and bowls as grinding tools. According to logical reasoning, the pestle method is to impact the coffee beans so that they can naturally crack, which should be the least damaging to the cells and should also be the most able to retain the good substances.

However, if you want to use the pestle method to grind in life now, it is almost impossible to use it in terms of manpower and time. Therefore, a good grinder is particularly important in the coffee market.