16 Must-Follow Facebook Pages For Machine Espresso Marketers

How Does Machine Espresso Work?

Machine espresso Coffee machine home uses precision pressure and amazing filter technology to make the delicious coffee we enjoy. What 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 pressure is the major difference.

The Head of the Group

The group head is the portafilter you put in when making espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the resulting extraction. There are many different kinds of group head, each with their own advantages and disadvantages. Some are specifically designed for temperature stability while others are built to handle pre-infusion. Others are made to control the lever. There are some that have a combination of features, such as the E61, which is considered to be the most popular among baristas due to its capacity to offer multiple benefits in a single package.

As you can see in the image above the group head is equipped with several notches. It is possible to place your portafilter into these notches and Espresso Coffee Machine Home turn the head around to secure it. There is also a gasket made of rubber that resides inside the notches, which helps create the seal when you insert your portafilter into the machine. The notches on the head permit an exact placement of the portafilter, which is necessary for an even extraction.

The group head is not just able to allow you to place your portafilter easily however it also keeps a constant temperature. This is done by cycling hot water around the portafilter and through the brew-basket, ensuring that the temperature is constant for extraction. It is important to remember that even a slight deviation can make the difference between a great and a great espresso.

The Pump

In contrast to piston machines that are manually operated, that use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure necessary for espresso extraction. The pressure is built by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be less expensive and last for longer than piston-driven machines. However, both types of machines can degrade due to overuse and poor cleaning. They also make mechanically complex, which can result in a high price tag on even the simplest models.

Certain espresso machines utilize steam pressure instead of a pump in order to brew espresso. The disadvantage of this is that the same boiler that produces steam also increases the temperature of water to boiling, which can lead to over-extraction. The machines also need to continually rebuild their pressure between cups. This requires energy and time.

Many espresso machines use a rotary or vibration pump. A vibration model utilizes an oscillating disk to create pressure, whereas a circular model pushes hot liquid through the ground at a fast speed. Both machines can make great espresso however rotary machines tend to be more stable, quieter and less likely to break down.

The Boiler

The boiler heats the water to the perfect temperature for extraction. The resulting steam reaches the portafilter containing ground espresso beans and is then pumped into the cup. During this process the steam is able to create enough pressure to push the coffee grounds through. This creates a foam on top of the espresso. This is one of the hallmarks of a great travel espresso maker.

There are three types of espresso makers, which differ in the type of pump they employ and how hot the espresso is. There are different ways to control the amount of brew, as well as the size of the cup that can be made by the machine.

The first espresso machines were steam-types. They used one boiler to create both brew and steam, however, the pressure they could produce was very low - just two bars of atmospheric pressure at most. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso machine is a semiautomatic with an electric pump. When people think of espresso machines, they think of these machines. Semi-automatic machines require you to grind and tamp your beans yourself, but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanised quality.