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

How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and mind-blowing filter technology to create the perfect cup of coffee. But how exactly does it work?

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

The Head of the Group

The group head is the portafilter is inserted when you are making espresso machines for home. It distributes water into the portafilter, and then regulates the pressure of extraction. There are many different types of group heads each with its own advantages and drawbacks. Some are designed to provide temperature stability while others are designed to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, such as the E61. This is a popular choice among baristas due to the fact that it has multiple benefits in one package.

As you can see in the image above, the group head has several notches to place your portafilter and then twist it with your hands to lock it in. A gasket made of rubber is positioned in the notches to create a seal as you insert your portafilter. The notches allow for precise placement of your portafilter. This is crucial for an even extraction.

In addition to allowing you to effortlessly insert your portafilter the group head is also responsible for maintaining a consistent temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is constant to extract the coffee. This is important, as even a few degrees can make the difference between a good and great espresso.

The Pump

The motorized pumps that are used in espresso machines rotary provide nine atmospheric bar pressure that is required to extract espresso. This differs from manual piston machines that use a lever. This pressure is built up by pumping water through a heat exchanger and then through the ground coffee.

Pumps are typically less expensive and last for longer than piston-driven machines. However, both types of machines can deteriorate due to overuse and insufficient cleaning. Pumps are also more complicated mechanically, and can add to the cost of even simpler models.

Certain espresso machines do away with the pump entirely and utilize steam pressure to make espresso. The downside is that the same boiler that produces steam also increases the temperature of the water until it reaches boiling which can cause excessive extraction. They also have to continuously rebuild their pressure between cups. This takes energy and time.

A large majority of espresso machines employ an rotary or a vibration pump. A vibration model uses an oscillating disk to create pressure, whereas a circular model pushes hot liquid through the ground at high speed. Both machines can make great espresso, however rotary machines are more quiet, durable and less likely to break.

The Boiler

The boiler is the component that heats the water to the ideal temperature to extract. The resultant steam then reaches the portafilter that contains the ground espresso and is then pumped into the cup. During this process, steam creates pressure to push through the grounds of the coffee. This produces a layer of crema on top. This is one of the hallmarks of a good espresso.

There are three kinds of espresso makers, and they differ in the type of pump they employ and how hot the espresso is. There are various ways that the brew can be controlled, as well as the dimensions of the cup the machine is capable of making.

The first espresso machines were steam type. The earliest espresso machines were steam types. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semiautomatic machine that has an electric pump. When people think of espresso machines, they picture these machines. With a semi-automatic machine you have to grind the beans and then tamp them by hand, but the pump is able to regulate the flow of water and pressure. This is a great compromise between the human touch and mechanized consistency.

The Filter

compact Espresso machine machines typically use a filter that separates the grounds of the coffee from the hot water. The filter is also a vital component of the machine's temp control, since it stops overheating.

It also aids in flavor, as a filter can allow for a longer bloom time. This helps the beans release their flavor and gives the chance for better extraction.

However, it is important to remember that even a top filter can result in a poor cup of coffee machines espresso as the quality of the beans and extraction is still vital.

It's in this area that the magic happens. This is the reason why espresso tastes so delicious. The grouphead (also known as the brewhead) is where you place the portafilter, which is the thingy that you put the coffee grounds in, when making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight tank to create steam. Steam is then pushed through the grounds at high pressure. These machines are less expensive and easier for the user to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They utilize an air compressor to force hot water into the ground, and are more mobile than steam-driven electric espresso machines.