10 Things That Your Family Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How exactly does it work?

To make an espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee but the key difference is in the pressure.

The Head of the Group

The name implies, the group head is the place you place your portafilter when making espresso. It disperses water into the portafilter, and regulates the pressure of extraction. There are a variety of group heads each with its own advantages and drawbacks. Some focus on temperature stability, while others on pre-infusion capabilities, and still others are designed to control the lever. There are some that contain a variety of features, like the E61 one, which is the classic choice among many baristas for its ability to offer multiple perks in a single package.

As you can see in the above photo the group head is made up of numerous notches that you can place your portafilter and twist it with your hands to lock it in. There is also a gasket made of rubber in the notches and helps create the seal when you insert your portafilter into the machine. The notches on the head permit an exact positioning of the portafilter which is necessary to ensure an efficient extraction.

Aside from allowing you to effortlessly insert your portafilter the group head is responsible for maintaining an even temperature. It does this by circulating hot water through the brew container and around the portafilter to ensure that it is always at the correct temperature for extraction. This is important because just a few degrees could make the difference between good and great espresso.

The Pump

Contrary to manual piston machines which use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to provide the nine atmospheric bars of pressure required to extract best small espresso machine. The pressure is built by pumping water through a heat exchanger and then through the ground coffee.

Pumps are generally less expensive and last longer than piston-driven machines. However, both types of machines can deteriorate due to overuse and inadequate cleaning. Pumps are also more complicated mechanically, which could increase prices of even simpler models.

Certain espresso machines utilize steam pressure instead of a pump to brew espresso. The disadvantage of this is that the same boiler that produces steam also raises the temperature of the water to boiling, which can lead to excessive extraction. In addition the machines often have to rebuild their pressure between cups, which requires time and energy.

A majority of espresso machines utilize a rotary or vibration pump. A vibration model makes use of the vibrating disk to create pressure, while the circular model pushes hot liquid through the ground at a high speed. Both machines can produce excellent espresso however rotary machines tend to be more stable, quieter and less likely to fail.

The Boiler

The boiler is the part which heats the water to the ideal temperature to extract. The resulting steam is then transferred to the portafilter which holds the ground espresso coffee maker coffee, and is then pumped down into the cup. During this process, steam causes pressure to push through the coffee grounds. This results in a whipped-up the top of the best espresso maker. This is a sign of a great espresso.

There are three kinds of espresso makers, and they differ in the type of pump they employ and the degree of heat that the brew is. There are different ways in which the brew can be controlled and the size of the cup that the machine is capable of making.

The first espresso machines were steam-types. They had one boiler to create steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure maximum. This resulted in the coffee tasting bitter and burnt. This is why Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most well-known espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp the beans yourself while the pump controls the water flow and pressure. This is a fantastic solution that combines human control with mechanised reliability.

The Filter

Typically, espresso machines employ filters that separate the grounds of coffee when they pass through the hot water. The filter is also an important part of the temperature control system as it prevents the machine from overheating.

A filter also improves flavor as it allows for a longer flowering period. This helps the beans to release their flavors and provides the chance for better extraction.

However, it is important to remember that even a top filter can make a terrible cup of coffee, because the quality of the beans and extraction are important.

This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead, also referred to as the brew head, is the place where the portafilter (the device you put the ground coffee in) sits when you're making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. Steam then pushes the hot water through the grounds with high pressure. These types of machines are generally cheaper and easier to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, compressed-air-pump-driven best espresso machine machines have become more popular. They use an air compressor to push hot water through grounds and are more portable than electric steam-driven machines.