What is the use of coffee press?
We all know that when using an espresso machine, the hot water is brewed at about 9 atmospheres (of course, this is not a fixed value, there are 12 atmospheres or more), and the pressure is very high when the water penetrates the coffee cake. the water is inert. What is inertia, that is, water will penetrate through the weakest part of the coffee cake, not from the thickest place. Therefore, if you do not use a coffee powder press to compact and flatten the coffee (to make the density of the coffee powder in the powder bowl as uniform as possible), the essence of the coffee will not be extracted, or some parts will be overextracted. The powder hammer has several important functions in making espresso:
The first is to press the ground coffee powder so that hot water can fully penetrate and flow through the coffee cakes.
The second is to keep the gap between the coffee powder consistent, because the coffee powder will begin to expand after absorbing water, which can easily lead to extraction imbalance.
The third is that the coffee powder in the handle is flattened to form a flat horizontal plane, so that the coffee powder can withstand the great pressure caused by the coffee machine extraction without being dispersed and affecting the taste of the extraction.
two。 Why are there different sizes of powder hammers?
In fact, there are two sizes of powder hammer, the small size is about 49mm to 53mm (4.9cm to 5.3cm), and the large size is from 57.5mm to 58.5mm (5.75cm to 5.85cm). The difference in specification is mainly due to the problems of household Italian machines and commercial coffee machines. Large powder bowls are commonly used in commercial use, and each coffee maker company has its own size, so the situation between 57.5mm and 58.5mm occurs.
General bias powder hammer manufacturers will be in 58mm, on the one hand, to facilitate production, on the other hand, the cost will be relatively low. If you ask for a more accurate size, the cost and technology will also increase, so the price will vary from dozens of yuan to 300 yuan. The powder hammer will also increase with the company brand, type of powder hammer, material, weight, design or limited edition and other influencing factors.
Well, from the above two main points, we can see that the main function of a powder press is to flatten and tamp the coffee powder. We can understand that the powder press has become a bridge between the barista and the coffee machine. After knowing this truth, it is easier to understand that a powder press is designed to meet the dual needs of baristas and coffee machines. The last part has talked about the specifications and models of various hammer bottoms.
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