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

How Does Machine Espresso Work?

The machine espresso utilizes precision pressure, and filtering technology that is amazing to create the coffee you 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 that of making drip coffee. However, the pressure is the main difference.

The Group Head

The group head is the portafilter you put in when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the extraction. There are many different kinds of group head, each with their particular advantages and drawbacks. Some are focused on temperature stability, some on pre-infusion features, and others are designed to control the lever. Some come with a combination of both, like the E61. This is a popular choice among baristas because it offers multiple advantages in a single package.

As you can see in the above image the group head is made up of many notches in which you can place your portafilter and twist it with your hands to secure it. A rubber gasket is located inside the notches to help create a seal as you insert your portafilter. The notches on the head allow for a precise placement of the portafilter, which is necessary to ensure an even extraction.

The group head does not just allow the portafilter to be inserted easily however it also keeps the temperature at a constant level. This is done by cycling hot water around the portafilter and through the brew-basket to ensure the temperature is always right to extract the coffee. This is important, as even a small difference in temperature can mean the difference between excellent and great espresso.

The Pump

In contrast to manual piston machines which rely on a lever to pressurize water, the rotary espresso machines use motorized pumps to deliver the nine atmospheric bars of pressure needed to extract espresso. This pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger before being pumped through the ground coffee in the group head.

Pumps are generally less expensive and last for longer than piston-driven machines. However, both types of machines can deteriorate because of excessive use and insufficient cleaning. Pumps are also more complex mechanically, which could increase the price of even the simple models.

Some mini espresso maker machines use steam pressure instead of a pump for brewing mini espresso machine. The drawback of this is that the boiler that produces steam also raises the temperature of water until it reaches boiling which could lead to over-extraction. In addition the machines often have to rebuild their pressure between cups, which requires time and energy.

Many espresso machine Black Friday (http://gtrade.cc/home.php?mod=space&Uid=322019) machines make use of a vibration or rotary pump, with a vibrating model using a vibrating disc to create pressure and a rotary model pushing hot water through the grounds at high speed. Both machines can produce excellent espresso, however rotary machines are quieter, more durable and less likely to break down.

The Boiler

The boiler is the component that heats the water to the ideal temperature to extract. The steam created gets to the portafilter which contains the espresso coffee grounds. It is then poured into the cup. During this process the steam generates enough pressure to push the grounds of coffee through. This creates a foam on top of the espresso. This is one of the main characteristics of a great espresso.

There are three different types of espresso machines, each having different types of pumps and the temperature of the brew. There are various ways that the brew may be controlled as well as the size of the cup that the machine can make.

The first espresso machines were steam-type. The first espresso machines were steam-type machines. The coffee tasted bitter and burned. The modern espresso machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic that has an electric pump. This is what people envision when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans on your own, but the pump regulates the flow of water and pressure. This is a great solution that combines human control with mechanised reliability.

The Filter

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

A filter also improves flavor since it allows for the beans to flower for a longer period of time. This allows the beans to release their flavors, and allows for better extraction.

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

This is where the magic happens. It's what makes an espresso really taste great. The grouphead, often referred to as the brew head, is where the portafilter (the thing you put the ground coffee into) is placed when making espresso.

Steam-driven espresso machines make use of hot water that is heated inside an airtight container to create steam. The steam then moves 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. However, they are limited in their capacity to create the perfect conditions for brewing, because they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar.

In recent years, compressed air-driven espresso machines have been gaining popularity. They use an air compressor to push hot water across the ground, and are more mobile than steam-driven electric espresso machines.