Don't Buy Into These "Trends" Concerning Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso employs precise pressure and amazing filter technology to make the delicious coffee we enjoy. But 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 making drip coffee. However the pressure is the main difference.

The Head of the Group

As the name suggests the group head is the place you insert your portafilter when making espresso. It is responsible for dispersing water into the portafilter and then controlling the pressure that results from the extraction. There are a variety of types of group head each with its distinct 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 preferred choice for baristas due to the fact that it has multiple benefits in one package.

As you can see in the picture above the head of the group is fitted with a variety of notches. You can place your portafilter into these notches and twist the head to lock it. A gasket made of rubber is placed within the notches to create a seal while you insert your portafilter. The notches permit an exact placement of the portafilter. This is essential for an efficient extraction.

In addition to allowing you to effortlessly insert your portafilter the group head is also responsible to ensure that the temperature remains even. It does this by cycling hot water through the brew container and around the portafilter to ensure that it is always at the correct temperature for extraction. It is crucial to keep in mind that even a small deviation can make the difference between a decent and a excellent espresso.

The Pump

The motorized pumps in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso. This differs from manual piston machines which use levers. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven machines, 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, which can increase prices of even simple models.

Some espresso machines make use of steam pressure instead of a pump to make espresso coffee maker. The drawback is that the same boiler that produces steam also increases the temperature of water until it reaches boiling which could lead to over-extraction. In addition these machines are often required to rebuild their pressure between cups, which requires time and energy.

Many espresso machines use either a vibration or rotary pump. A vibration model makes use of an oscillating disk to create pressure, while a circular model pushes hot liquid through the ground at a rapid speed. Both types of machines can produce an excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the one that makes the water warm to the perfect temperature to extract. The resultant steam then reaches the portafilter which holds the ground espresso coffee, and is then pumped down into the cup. The steam generates enough pressure to push the coffee grounds through. This results in a whipped-up the top of the espresso. This is a hallmark of a great espresso.

There are three distinct types of espresso home machine machines, each with different types of pumps and brew temperature. There are also different ways in which the brew could be controlled, as well as the size of the cup the machine can make.

The first espresso machines were steam type. They had only one boiler to make both steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. The modern espresso machine was created by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic that has an electric pump. When people think of pro espresso machine machines, they envision these machines. Semi-automatic machines require you to grind and tamp your beans yourself The pump, however, regulates the water flow and pressure. This is a fantastic combination of human control and mechanised accuracy.

The Filter

Espresso machines usually have a filter that separates the grounds of the coffee from hot water. The filter is also a vital element of the machine's temperature control, as it prevents overheating.

Filters also aid in flavor as it allows for a longer flowering phase. This helps the beans release their nuances and gives the chance for better 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 process are still crucial.

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

In a steam-driven travel espresso maker machine hot water is heated in an airtight tank to produce steam, which is then pushed through the grounds at high pressure. These machines are cheaper and are easier for the user to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, mini Espresso maker machines driven by a compressed air pump have become increasingly popular. They utilize an air compressor to force hot water into the ground and are more mobile than electric steam-driven espresso machines.