자유게시판

How Does Machine Espresso Work?

The machine espresso maker for home utilizes precision pressure, and a filtering system that is awe-inspiring to make the coffee you love. How exactly does it work?

Espresso is created by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.

The Group Head

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 controlling the pressure of the extraction. There are several different types of group heads each with its own advantages and drawbacks. Some are designed to provide the stability of temperature while some are built to handle pre-infusion. Others are made to control the lever. There are even some that have a combination of features, such as the E61 one, which is 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 photo above the group head is made up of several notches to place your portafilter and then twist it with your hands to secure it. There is also a gasket made of rubber that is a part of the notches to help create a seal when you insert your portafilter into the machine. The notches on the head permit a precise positioning of the portafilter which is vital for a consistent extraction.

Aside from allowing you to easily place your portafilter in, the group head is responsible for maintaining an even temperature. It does this by circulating hot water through the brew basket and around the portafilter to ensure that it is always at the right temperature to extract. This is vital, because just a few degrees could make the difference between good and excellent espresso.

The Pump

Contrary to manual piston machines which use a lever to pressurize water, the rotary espresso machines use motorized pumps to supply the nine atmospheric bars of pressure required for espresso extraction. This pressure is built up 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 kinds of machines can deteriorate because of frequent use and poor cleaning. They also increase the complexity of mechanical systems, which can result in a high price tag on even the most basic models.

Some cafe espresso machine machines use steam pressure instead of a pump in order to brew espresso. This could lead to over-extraction since the boiler that produces steam also heats the water to boil. Additionally the machines often have to restore their pressure between cups, which requires time and energy.

A majority of espresso machines use the rotary or vibration pump, with a vibration model using a vibrating disc that generates the pressure, and a rotary model pushing hot water through the grounds at high speed. Both types of machines are capable of producing excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component that heats water to the optimal temperature for extraction. The steam that is created is then directed to the portafilter, which holds the espresso grounds. It is then poured into the cup. During this process, steam creates pressure to push through the grounds of the coffee. This creates a crema on top of the espresso. This is one of the main characteristics of a great espresso.

There are three different types of espresso machines, each having distinct pumps and brew temperature. There are a variety of ways to control the strength of the brew and the size of cup that can be made by the machine.

The earliest espresso machines were steam-based. They used a single boiler to make steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure at most. This led to the coffee tasting bitter and burnt. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most popular espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans by yourself The pump, however, regulates the water flow and pressure. This is a fantastic compromise between human control and mechanized reliability.

The Filter

espresso Machine with grinder - www.carelaw.co.Kr, machines usually have a filter that separates the grounds of the coffee from the hot water. The filter is also a vital component of the machine's temp control, as it helps prevent overheating.

Filters also aid in flavor since it allows for a longer flowering phase. This allows the beans to release their flavor and gives an opportunity to improve extraction.

It is important to remember that even the best filter can make a bad cup of coffee. The quality espresso machine of the beans and the extraction process, are still very important.

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

Steam-driven espresso makers machines make use of hot water that is heated inside an airtight container to create steam. The steam then pushes hot water through grounds of the coffee under pressure. These kinds of machines tend to be less expensive and easier 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 ideal 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 through the ground and are much more mobile than steam-driven electric espresso machines.