It's The Ugly Truth About Machine Espresso > 자유게시판

How Does Machine espresso coffee machine with milk frother Work?

The machine espresso utilizes precision pressure, and filter technology that is mind-blowing to make the coffee you enjoy. How exactly does it work?

In order to make buy espresso makers, hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the major difference.

The Head of the Group

As the name implies the group head is the place you insert your portafilter when brewing espresso. It disperses water into the portafilter, and regulates the pressure of extraction. There are a variety of types of group heads, each with their particular advantages and drawbacks. Some are focused on temperature stability, some on pre-infusion options, and others are designed to control the lever. Some have a combination of features, such as the E61 one, which is to be the most popular among baristas for its ability to offer multiple benefits in a single package.

As you can see in the photo above, the group head has numerous notches that you can put your portafilter, then twist it by hand to lock it in. There is also a gasket of rubber that is a part of the notches and helps create an airtight seal after inserting your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is essential to ensure a consistent extraction.

The group head not only lets the portafilter to be inserted easily, but it also maintains a constant temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket to ensure the temperature is always right to extract the coffee. It is important to realize that even a few degree variation can mean the difference between a good and great espresso.

The Pump

Contrary to manual piston machines which rely on a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure necessary for espresso extraction. This pressure builds up by drawing tap water from a reservoir and pumping it through a heat exchanger prior to being pushed through the ground coffee inside the group head.

Pumps are typically less expensive and last longer than piston-driven machines. However, both types of machines are susceptible to degrading because of frequent use and poor cleaning. Pumps are also more complicated mechanically, which can increase prices of even simplest models.

Certain espresso machines do away with the pump completely and instead utilize steam pressure to make espresso. The drawback is that the same boiler that produces steam also increases the temperature of the water until it reaches boiling which can cause excessive extraction. The machines also need to continually rebuild their pressure between cups. This requires energy and time.

Many espresso maker for home machines utilize the rotary or vibration pump, which is a vibration model using a rotating disc to create the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both machines produce great espresso however rotary machines tend to be more quiet, durable and less likely to break.

The Boiler

The boiler will heat the water to the ideal temperature for extraction. The resulting steam reaches the portafilter which holds ground espresso beans and is then pumped into the cup. The steam creates pressure and pushes through the coffee grounds. This results in a crema on top of the espresso. This is one of the hallmarks of a good espresso.

There are three types of espresso makers, and they differ in the type of pump they employ and the degree of heat that the coffee is. There are various ways that the brew can be controlled, as well as the dimensions of the cup the machine can make.

The earliest Espresso machines Home machines were steam types. The earliest espresso machines were steam types. The coffee tasted bitter and burnt. This is why Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most popular espresso machine is a semiautomatic model with an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic machine you grind the beans and tamp them by hand. The pump controls the flow of water and pressure. This is an excellent compromise between human touch and mechanized quality.

The Filter

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

It also aids in flavor as a filter allows for a longer bloom time. This allows the beans to release their flavors, and also 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 of the beans, as well as the extraction, remain crucial.

It's here that the magic takes place. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy which you put the coffee grounds into, while making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to produce steam, which then pushes the hot water through the grounds at a high pressure. These kinds of machines are usually less expensive and simpler to maintain than pump-driven models. They are however limited in their ability to create the ideal conditions for brewing, as they 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 become more popular. They utilize an air compressor to push hot water into the grounds and are significantly more portable than steam-driven electric machines.