5 Laws That Can Benefit The Machine Espresso Industry > 문의하기

How Does Machine Espresso Work?

The machine espresso is made using precise pressure, as well as a filtering technology that is amazing to create the coffee you love. How exactly does it work?

espresso machine with milk frother is made by forcing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee, but the difference is in the pressure.

The Head of the Group

As the name implies the group head is where you place your portafilter when brewing espresso. It distributes water into the portafilter and regulates the pressure of the extraction. There are a variety of group heads each with distinct advantages and disadvantages. Some are designed to provide temperature stability while others are built to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, such as the E61. This is a favorite among baristas since it provides multiple benefits in one package.

As you can see in the photo above, the group head has several notches to place your portafilter and then twist it by hand to secure it. A gasket of rubber is situated inside the notches to help create a seal as you insert your portafilter. The notches on the head permit an exact location of the portafilter which is crucial to ensure an even extraction.

Aside from allowing you to easily connect your portafilter, the group head is also responsible to maintain an even temperature. It does this by circulating hot water through the brew basket and around the portafilter to ensure that it's always at the right temperature to extract. This is important, as even a small difference in temperature can mean the difference between excellent and great espresso.

The Pump

Unlike manual piston machines, that use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure needed for espresso extraction. This pressure builds up by drawing tap water from a reservoir and pumping it through a heat exchanger prior being shot through the ground coffee inside the group head.

Pumps tend to be less expensive and last longer than piston-driven machines. However, both kinds of machines can degrade because of frequent use and insufficient cleaning. They also add mechanical complexity, which can result in a high price tag on even the most basic models.

Some espresso machines use steam pressure instead of a pump to make Barista Espresso Coffee Machine. This can lead to over-extraction as the boiler that produces steam also causes the water to boil. The machines also need to constantly rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines use a vibration or rotary pump, with a vibration model that uses a vibrating disc to generate the pressure and a rotary model pushing hot water through the grounds under high speed. Both machines can produce excellent espresso however rotary machines tend to be quieter, more durable and less likely to break down.

The Boiler

The boiler is the component that heats water to an optimal temperature to extract. The resultant steam then reaches the portafilter which holds the ground espresso and gets funnelled down into the cup. During this process, steam causes pressure to push through the grounds of the coffee. This creates a foam on top of the espresso. This is one of the main characteristics of a good espresso.

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

The earliest espresso machines were steam types. They had a single boiler to make both steam and brew however the pressure they were able to create was minimal - two bars of atmospheric pressure at the most. This resulted in the coffee machines espresso tasting burnt and bitter. This is the reason Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known retro espresso maker maker is a semi-automatic machine with an electric pump. This is what people envision when they imagine an espresso machine. With a semi-automatic machine you must grind the beans and tamp them yourself but the pump provides regulated water flow and pressure. This is a perfect solution that combines human control with mechanized consistency.

The Filter

Typically, barista espresso coffee machine espresso machines use filters to separate 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.

A filter also improves flavor as it allows for a longer flowering phase. This helps the beans to release their nuances and gives an opportunity to improve extraction.

It is important to keep in mind that even the finest filter could result in a poor cup of coffee. The quality of the beans and the extraction process, remain vital.

It's in this area that the magic occurs. This is what makes espresso taste so good. The grouphead, also called the brewhead, is where the portafilter (the container you place the coffee for espresso machine ground into) is placed when making espresso machine sale.

In the steam-driven espresso machine hot water is heated in an airtight container to produce steam, which then pushes the hot water through the grounds under high pressure. These types of machines tend to be cheaper and easier to maintain than pump-driven models. However, they are limited in their ability to produce the perfect brewing conditions as they only operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bar.

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