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

How Does Machine Espresso Work?

The machine espresso is made using precise pressure, as well as a filtering system that is awe-inspiring to create the coffee you enjoy. How exactly does it work?

Espresso is produced by pushing hot water at high pressure through finely ground coffee. The process is similar to making drip coffee. However, it is the pressure that makes the main difference.

The Head of the Group

The group head is the portafilter you insert when brewing espresso. It disperses water in the portafilter, and controls the pressure of the extraction. There are a variety of types of group head each with its particular advantages and drawbacks. Some focus on temperature stability, whereas others on pre-infusion capabilities, while others are designed to control the lever. Some are a combination, like the E61. This is a very popular choice for baristas due to the fact that it has multiple advantages in a single package.

As you can see in the photo above the group head is made up of numerous notches that you can put your portafilter, then twist it manually to secure it. A gasket made of rubber is positioned inside the notches to help create a seal while you insert your portafilter. The notches on the head permit a precise location of the portafilter which is essential to ensure an efficient extraction.

In addition to allowing you to easily place your portafilter in, the group head is also responsible to ensure that the temperature remains even. This is achieved by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is at the right level to extract the coffee. It is important to note that even a slight differences can make the distinction between a great and a great espresso coffee machines uk.

The Pump

Contrary to manual piston machines which rely on a lever to pressurize water, rotary espresso machines rely on motorized pumps to deliver the nine atmospheric bars of pressure necessary to extract espresso. This pressure is built up by pumping water through a heat exchanger and then through the ground coffee and espresso maker.

Pumps are typically less expensive than piston-driven machines and tend to last longer, but both types of machine can be damaged by excessive use and inadequate cleaning. Pumps are also more complicated mechanically, which can raise the price of even the simpler models.

Certain espresso machines utilize steam pressure instead of a pump to brew espresso. The drawback of this is that the boiler that produces steam also raises the temperature of the water to boiling and can result in excessive extraction. In addition these machines typically have to restore their pressure between cups, which requires time and energy.

A majority of espresso machines utilize either a vibration or rotary pump. A vibration model uses the vibrating disk to create pressure, whereas a circular model pushes hot liquid through the ground at a high speed. Both types of machines are capable of producing excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the one that makes the water warm to the perfect temperature for extraction. The steam produced gets to the portafilter which is the container that holds the espresso coffee grounds. It is then poured into the cup. During this process the steam creates enough pressure to push the coffee grounds through. This creates a foam on the top of the espresso. This is a hallmark of a good espresso.

There are three kinds of espresso machines, each with different types of pumps and brew temperature. There are different ways to control the brew as well as the size of the cup that can be produced by the machine.

The first espresso machines were steam-type. The earliest espresso machines were steam-type machines. This led to the coffee tasting bitter and burnt. The modern espresso coffee machine home machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semi-automatic machine with an electric pump. When people think of espresso machines, they picture these machines. With a semi-automatic machine you need to grind the beans and then tamp them by hand, but the pump provides regulated water flow and pressure. This is a perfect combination of human control and mechanised consistency.

The Filter

Typically, espresso machines use filters bean to cup espresso machines separate the coffee grounds as they pass through the hot water. The filter is also a vital component of the machine's temp control, as it helps prevent overheating.

A filter also helps with flavor because it allows for an extended flowering time. This lets the beans let their nuances out, and improves extraction.

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

It's here that the magic takes place. This is the reason why espresso tastes so good. The grouphead, often called the brew head, is the place where the portafilter (the thing you put the ground coffee into) sits when you're making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to create steam. This is then pushed through the grounds at a high pressure. These types of machines tend to be less expensive and simpler to maintain than pump-driven models. They are however limited in their ability to create the perfect 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 espresso machines have been gaining popularity. They utilize an air compressor to force hot water into the ground, and are more mobile than electric steam-driven espresso machines.