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20 Trailblazers Leading The Way In Machine Espresso
How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and amazing filter technology to make the perfect cup of coffee. What exactly is it?

Espresso is made by forcing hot water at 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

The group head is the portafilter that you place in the espresso maker when making it. It is responsible for dispersing the water into the portafilter and then controlling the pressure of the resulting extraction. There are many different kinds of group heads, each with their unique advantages and disadvantages. Some are specifically designed for the stability of temperature while some are designed to handle pre-infusion. Others are made to control the lever. Some have a combination, like the E61. This is a very popular choice for baristas since it provides multiple benefits in one package.

As you can see in the above photo the group head has a number of notches. It is possible to place your portafilter into these notches and twist the head to secure it. A gasket made of rubber is placed inside the notches, which helps make a seal when you insert your portafilter. The notches allow for the precise placement of the portafilter. espresso machines uk is crucial to ensure a consistent extraction.

The group head does not just allow you to put in your portafilter easily, but it also maintains an even temperature. It does this by circulating hot water through the brew pan and around the portafilter, making sure that it is always at the correct temperature to extract. This is important because even a small difference in temperature can be the difference between a excellent and great espresso.

The Pump

Motorized pumps in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso. This differs from manual piston machines that use a lever. The pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger before it is shot through the ground coffee in the group head.

Pumps tend to be cheaper than piston-driven machines, and they tend to last longer, however both types of machine can become damaged due to excessive use and poor cleaning. They also create mechanical complexity and can lead to an expensive price for even the most basic models.

Some espresso machines eliminate the pump entirely and utilize steam pressure to make espresso. The drawback of this is that the boiler that produces steam also raises the temperature of the water to boiling and can result in over-extraction. The machines also need to constantly rebuild their pressure between cups. This takes energy and time.

A large majority of espresso machines employ the rotary or vibration pump. A vibration model utilizes an oscillating disk to create pressure, while the Rotary model pushes hot coffee through the ground at a high speed. Both types of machine can produce an excellent espresso, but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component which heats the water to the ideal temperature for extraction. The steam that is produced reaches the portafilter, which is the container that holds the espresso coffee grounds. It is then pumped into the cup. The steam creates pressure and pushes through the grounds of the coffee. This results in a layer of crema that is then poured over. This is the hallmark of a great espresso.

There are three types of espresso makers. They differ in the type of pump they employ and how hot the brew is. There are various ways to control the strength of the brew and the size of cup that can be made by the machine.

The first espresso machines were steam-based. The earliest espresso machines were steam-type machines. This resulted in the coffee tasting bitter and burnt. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most well-known espresso maker is a semi-automatic one with an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic machine, you have to grind the beans and tamp them by hand. However, the pump controls the flow of water and pressure. This is a perfect compromise between human control and mechanised accuracy.


The Filter

Espresso machines usually use a filter that separates the coffee grounds from the hot water. The filter is also an essential element of the machine's temperature control, as it helps prevent overheating.

It also improves flavor as a filter allows for a more prolonged bloom time. This lets the beans release their flavor and also allows for better extraction.

However it is crucial to keep in mind that even a high-quality filter can result in a poor cup of coffee, since the quality of the beans and extraction are crucial.

It's here that the magic takes place. This is the reason why espresso tastes so good. The grouphead, often referred to as the brew head, is the place where the portafilter (the thing you put the ground coffee into) is placed when making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight container to make steam. The steam then pushes hot water through the grounds of coffee at high pressure. These kinds of machines are typically cheaper and easier to maintain than pump-driven models. They are however limited to create the perfect brewing conditions as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent times, espresso machines powered by compressed air-pump have become increasingly popular. They use an air-compressor to force hot water through the ground. They are also more mobile than steam-driven electric espresso machines.

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