The 10 Most Terrifying Things About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and incredible filter technology to produce the coffee we love. What exactly is it?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the primary difference.

The Group Head

The name implies, the group head is where you insert your portafilter when brewing espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure that results from the extraction. There are a variety of types of group head, each with their particular advantages and disadvantages. Some are focused on temperature stability, whereas others on pre-infusion features, and others are designed to control the lever. Some include a combination such as the E61. This is a popular choice among baristas due to the fact that it has multiple advantages in one package.

As you can see from the above photo the group head is equipped with several notches. It is possible to place your portafilter into these notches and twist the head to secure it. A gasket made of rubber is positioned inside the notches, which helps create a seal as you insert your portafilter. The notches on the head allow for an exact positioning of the portafilter which is vital for a consistent extraction.

The group head not only allows the portafilter to be inserted easily, but it also maintains an even temperature. This is done by cycling hot water around the portafilter, and through the brew basin, ensuring the temperature is always right for extraction. It is important to remember that even a small differences can make the distinction between a good and a excellent espresso.

The Pump

The motorized pumps used in rotary espresso home machine (head to Jasperwiki) machines supply the nine atmospheric bar pressure needed for espresso extraction. This is different from manual piston machines that use levers. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive and last longer than piston-driven machines. However, both kinds of machines may degrade due to excessive use and inadequate cleaning. Pumps are also more complicated mechanically, and can add bean to cup espresso machine the cost of even simple models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The disadvantage of this is that the boiler that produces steam also raises the temperature of the water to boiling which can cause over-extraction. The machines must also constantly rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of the rotary or vibration pump. A vibration model utilizes a vibrating disk to generate pressure, whereas a Rotary model pushes hot coffee through the ground at high speed. Both models are capable of producing excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element which heats the water to the optimal temperature for extraction. The steam produced gets to the portafilter which holds the espresso grounds. It is then poured into the cup. The steam is able to create enough pressure to push the grounds of the coffee through. This results in a layer crema that is then poured over. This is the hallmark of a good espresso.

There are three types of espresso machines, each having different pumps and brew temperature. There are also different ways in which the brew can be controlled as well as the size of the cup the machine can produce.

The first espresso machines were steam-based. They used only one boiler to make both brew and steam, but the pressure they could generate was low - only two bars of atmospheric pressure at the most. This led to the coffee tasting burnt and bitter. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most well-known espresso coffee machine uk maker is a semi-automatic one that has an electric espresso maker pump. These are the things people think of when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans on your own however the pump controls the water flow and pressure. This is a great compromise between the human touch and the mechanized quality.

The Filter

buy espresso machines machines usually have a filter that separates the grounds of the coffee from hot water. The filter is also a vital component of the machine's temp control, since it stops overheating.

It also aids in flavor, since a filter allows for a more prolonged bloom time. This helps the beans to let their nuances out and provides the chance for better extraction.

It is important to keep in mind that even the most efficient filter can make a bad cup of coffee. The quality of the beans, and the extraction process, remain crucial.

It's here that the magic takes place. This is what makes espresso taste so good. The grouphead, often called the brew head, is the place where the portafilter (the device you put the coffee ground into) is placed when making espresso.

Steam-driven espresso machines use hot water that is heated in an airtight vessel to create steam. The steam then pushes hot water through the grounds of coffee at high pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. They are however limited to create the perfect conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, compressed-air-pump-driven espresso machines have been gaining popularity. They use an air compressor to force the hot water through the grounds and are much more portable than electric steam-driven machines.