The Biggest Problem With Machine Espresso And What You Can Do To Fix It > 자유게시판

How Does Machine Espresso Work?

The machine espresso utilizes precision pressure, and a filtering system that is awe-inspiring to make the coffee you love. 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 the main difference lies in the pressure.

The Head of the Group

As the name suggests the group head is the place you place your portafilter while making espresso. It disperses the water into the portafilter and controls the pressure of the extraction. There are several different types of group head, each with their particular advantages and disadvantages. Some focus on temperature stability, whereas others on pre-infusion capabilities, while others are designed to control the lever. Some come with a combination of both, such as the E61. This is a popular choice among baristas as it provides a variety of advantages in a single package.

As you can see from the above photo the group head is fitted with several notches. It is possible to place your portafilter inside these notches, and then twist the head to lock it. There is also a rubber gasket which is located inside the notches to help create the seal when you insert your portafilter into the machine. The notches permit precise placement of the portafilter. This is crucial to ensure an accurate extraction.

In addition to allowing you to easily insert your portafilter, the group head is also responsible for maintaining a consistent temperature. It does this by circulating hot water through the brew basket and around the portafilter, making sure that it's always at the correct temperature to extract. This is important, as even a small difference in temperature can make the difference between a good and great espresso.

The Pump

The motorized pumps that are used in rotary espresso machines provide the nine atmospheric bar pressure needed to extract espresso. This is different from manual piston machines which use a lever. The pressure builds by drawing tap water from a reservoir and pumping it through a heat exchanger prior it is shot through the ground coffee in the group head.

Pumps are typically less expensive and last for longer than piston-driven machines. However, both types of machines may degrade due to overuse and inadequate cleaning. Pumps are also more complicated mechanically, which could increase the cost of even simpler models.

Certain espresso machines can eliminate the pump completely and make use of steam pressure to make espresso. This can cause over-extraction because the boiler that makes steam also heats the water to boil. In addition these machines typically have to restore their pressure between cups, which takes time and energy.

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

The Boiler

The boiler is what will heat the water to the right temperature for extraction. The resultant steam then reaches the portafilter that contains the ground espresso coffee and is then funneled down into the cup. The steam creates pressure that pushes through the grounds of the coffee. This results in a crema on top of the espresso capsule machine. This is one of the main characteristics of a good espresso.

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

The first espresso coffee machines for sale (you could check here) machines were steam type. They used only one boiler to make both steam and brew, but the pressure they could produce was not very high - two bars of atmospheric pressure at most. This resulted in the coffee tasting bitter and burnt. This is the reason why Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most popular best espresso machine under 200 machine is a semiautomatic with 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 by yourself however the pump controls the water flow and pressure. This is a perfect solution that combines human control with mechanised accuracy.

The Filter

Typically, espresso machines use filters to 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 keeps the machine from overheating.

It also enhances flavor, since a filter allows for a more prolonged bloom time. This allows beans to release their nuances and gives the chance for better extraction.

However it is crucial to keep in mind that even a high-quality filter can make a terrible cup of coffee, as the quality of the beans and extraction is important.

This is where the magic happens. It's what makes espresso taste great. The grouphead (also known as the brewhead) is where you put the portafilter, the thingy that you use to put the coffee grounds in, when making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to create steam. The steam then moves hot water through the grounds of coffee at high pressure. They are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, espresso machines powered by a compressed air pump have become increasingly popular. They use an air compressor to push hot water into the grounds and are significantly more portable than steam-driven electric machines.