• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and a filtering technology that is amazing to create the coffee you love. What exactly does it work?

To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However it is the pressure that makes the main difference.

The Group Head

The group head is the portafilter you place in the espresso maker when making it. It disperses water into the portafilter, and then regulates the pressure of extraction. There are a variety of types of group head, each with their own advantages and drawbacks. Some are designed for stability of temperature while others are specifically designed to handle pre-infusion. Others are built to control the lever. There are also some that contain a variety of features, like the E61, which is considered the standard choice for many baristas for its ability to offer multiple perks in a single package.

As you can see in the picture above the group head is fitted with several notches. It is possible to place your portafilter inside these notches, and then twist the head to lock it. There is also a gasket of rubber that resides inside the notches to help create an airtight seal when you insert your portafilter into the machine. The notches allow for an exact placement of the portafilter. This is crucial to ensure an accurate extraction.

The group head not only lets you to insert your portafilter easily however it also keeps an even temperature. It does this by circulating hot water through the brew basket, and around the portafilter to ensure that it is always at the correct temperature for extraction. This is crucial, since even a few degrees can make the difference between good and great espresso.

The Pump

Unlike manual piston machines, which rely on a lever that pressurize water, the rotary retro espresso machine machines use motorized pumps to provide the nine atmospheric bars of pressure needed for espresso extraction. The pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger prior being pushed through the ground coffee inside the group head.

Pumps are typically less expensive than piston-driven machines and tend to last longer, however both types of machines may be damaged by excessive use and inadequate cleaning. Pumps are also more complicated mechanically, and can add to the cost of even simplest models.

Certain espresso machines utilize steam pressure instead of a pump to make espresso coffee machine for home. This can lead to over-extraction as the boiler that makes steam also heats the water until it comes to a boil. They also have to continuously rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines use either a rotary or vibration pump, with a vibration model using a vibrating disc that generates the pressure and the rotary model pushing hot water through the grounds under high speed. Both machines can produce excellent espresso, but rotary machines are more quiet, durable and less likely to break down.

The Boiler

The boiler is the component that heats water to an ideal temperature to extract. The resulting steam is then transferred to the portafilter that contains the ground espresso coffee, and gets funnelled down into the cup. During this process the steam generates enough pressure to push the grounds of coffee through. This results in a layer of crema on top. This is one of the main characteristics of a good espresso.

There are three kinds of espresso machines, each with distinct pumps and the temperature of the brew. There are also different ways in which the brew could be controlled, as well as the dimensions of the cup the maker can create.

The first espresso machines were steam types. The earliest best budget espresso machine, have a peek at this site, machines were steam types. The coffee tasted bitter and burnt. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most popular espresso machine is a semiautomatic with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp your beans yourself while the pump controls the water flow and pressure. This is an excellent compromise between human touch and the mechanised quality.

The Filter

Espresso machines usually use filters that separate the grounds of the coffee from the hot water. The filter is also a vital part of the machine's temperature control, since it helps to prevent overheating.

It also aids in flavor, as it allows for a more prolonged bloom time. This lets the beans release their flavor and allows for better extraction.

However, it is important to keep in mind that even a great filter could result in a bad cup of coffee, because the quality of the beans and extraction are vital.

This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead (also called the brewhead) is where you place the portafilter, which is the thingy used to place the grounds of coffee into while making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to create steam. The steam then pushes hot water into the grounds of coffee at high pressure. These kinds of machines are generally cheaper and easier to maintain than pump-driven models. However, they are not as efficient in their ability to create the perfect brewing conditions since they are only operating at 1-1.5 bars of pressure. The perfect shot requires 9-10 bar.

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