10 Things That Your Family Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso employs precise pressure and incredible filter technology to produce the delicious coffee we enjoy. What exactly is it that makes it work?

Espresso is created by forcing hot water under pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Head of the Group

The group head is the portafilter you insert when brewing espresso. It is responsible for dispersing the water into the portafilter before controlling the pressure of the resulting extraction. There are several different types of group head, each with their unique advantages and drawbacks. Some are designed for stability in temperature, while others are specifically designed to handle pre-infusion. Others are built to control the lever. Some include a combination such as the E61. This is a very popular choice for baristas as it provides a variety of benefits in one package.

As you can see in the image above, the group head has numerous notches that you can place your portafilter and then twist it by hand to secure it. There is also a gasket of rubber which is located inside the notches to help create an airtight seal after inserting your portafilter into the machine. The notches on the head permit an exact position of the portafilter which is necessary to ensure an efficient extraction.

In addition to allowing you to easily connect your portafilter, the group head is also responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, making sure that the temperature is always at the right level to extract the coffee. This is crucial, since even a small difference in temperature can make the difference between excellent and great espresso.

The Pump

The motorized pumps used in rotary espresso machines provide the nine atmospheric bar pressure needed to extract espresso. This differs from manually operated piston machines that employ levers. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee machines espresso.

Pumps tend to be cheaper than piston-driven machines and tend to last longer, but both types of machines could become damaged due to excessive use and poor cleaning. They also increase the complexity of mechanical systems which can result in costly prices for even the simplest models.

Some best budget espresso machine machines do away with the pump completely and instead employ steam pressure to create espresso coffee machine with milk frother. This can result in over-extraction because the boiler that produces steam also heats the water until it comes to a boil. The machines also need to constantly rebuild their pressure in between cups. This requires energy and time.

Many espresso machines use either a vibration or rotary pump. A vibration model employs an oscillating disk to create pressure, while the Rotary model pushes hot coffee through the ground at a high speed. Both types of machine can make a great espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler makes the water warm to the ideal temperature to extract. The steam that is created will eventually reach the portafilter, which is the container that holds the espresso coffee grounds. It is then funneled into the cup. During this process, steam creates pressure that pushes through the coffee grounds. This results in a layer of crema that is then poured over. This is the hallmark of a good espresso.

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

The earliest espresso machine black friday machines were steam type. They utilized one boiler to make both steam and brew, but the pressure they could generate was low - only two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp the beans yourself however the pump controls the flow of water and pressure. This is an excellent solution that combines human control with mechanized reliability.

The Filter

Typically, espresso machines have a filter to separate out the grounds of the coffee as they go through the hot water. The filter is also an essential part of the machine's temperature control, since it helps to prevent overheating.

It also enhances flavor, since a filter can allow for a longer bloom phase. This helps the beans release their flavor and gives an opportunity for a better extraction.

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

This is where the magic happens. It's what makes an best espresso machine really taste great. The grouphead (also called the brewhead) is where you place the portafilter, which is the thingy that you put the coffee grounds into, when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds with high pressure. These types of machines are typically cheaper and easier 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, compressed air pump-driven espresso machines have been gaining popularity. They use an air compressor to force hot water through the grounds, and are far more portable than electric steam-driven machines.