The Ultimate Guide To Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and amazing filter technology to make the perfect cup of coffee. But how exactly does it work?

To make an 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 Head of the Group

The group head is the portafilter you insert when brewing espresso. It disperses water in the portafilter and regulates the pressure of extraction. There are numerous kinds of group heads, each with its own advantages and disadvantages. Some are designed for temperature stability while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some are a combination, like the E61. This is a very popular choice for baristas since it provides multiple benefits in a single package.

As you can see from the photo above, the group head is fitted with a variety of notches. You can place your portafilter in these notches, then twist the head to lock it. A rubber gasket is located inside the notches to help create a seal as you insert your portafilter. The notches permit precise placement of the portafilter. This is crucial to ensure a consistent extraction.

Aside from allowing you bean to cup espresso machines easily connect your portafilter, the group head is responsible for maintaining an even temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket to ensure that the temperature is always at the right level to extract the coffee. This is important because even a small difference in temperature can be the difference between a good and great espresso.

The Pump

The motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure that is required for espresso extraction. This is different from manual piston machines that use a lever. This pressure is generated by pumping water through a heat exchanger and automatic espresso machine then through the ground coffee.

Pumps tend to be cheaper than piston-driven models, and they tend to last longer, however both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, and can add to prices of even simpler models.

Some espresso machines use steam pressure instead of a pump to brew espresso. The disadvantage of this is that the same boiler that produces steam also increases the temperature of water until it reaches boiling which can cause excessive extraction. In addition, these machines frequently have to rebuild 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 a vibrating disk to generate pressure, whereas a Rotary model pushes hot coffee through the ground at high speed. Both machines can make great espresso, but rotary machines are quieter, more durable and less likely to fail.

The Boiler

The boiler is the part that heats water to an optimal temperature for extraction. The steam that is produced reaches the portafilter, which is a container for espresso grounds. The steam is then channeled into the cup. In this process, the steam creates pressure to push through the coffee grounds. This results in a crema on top of the espresso. This is one of the main characteristics of a great espresso.

There are three kinds of espresso machines, each having a different type of pump and the temperature of the brew. There are a variety of ways to control the strength of the brew and the size of cup that can be made by the machine.

The first espresso machines were steam-types. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most well-known espresso maker is a semi-automatic one with an electric pump. When people think of espresso machines, they picture these machines. With a semi-automatic espresso machine, you need to grind the beans and then tamp them by hand. However, the pump provides regulated water flow and automatic espresso machine pressure. This is a great compromise between the human touch and mechanized quality.

The Filter

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

It also helps with flavor as a filter allows for a more prolonged bloom time. This allows the beans to release their nuances, and improves extraction.

It is important to remember that even the most efficient filter can result in a bad cup of coffee. The quality of the beans and the extraction, are still very important.

This is where the magic happens, and it's what makes an espresso really taste great. The grouphead (also called the brewhead) is where you put the portafilter, which is the thingy which you put the coffee grounds in, while making espresso.

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

In recent years, espresso machines uk machines driven by a compressed air compressor have become increasingly popular. They utilize an air compressor to push hot water across the ground. They are also more mobile than steam-driven electric espresso machines.