9 Things Your Parents Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to make the coffee we love. But how 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 main difference.

The Group Head

As the name implies the group head is the place you put your portafilter in when making espresso. It disperses the water into the portafilter, and controls the pressure of the extraction. There are several different types of group head, each with their particular advantages and drawbacks. Some focus on temperature stability, while others on pre-infusion options, and others are designed to control the lever. Some contain a variety of features, like the E61, which is considered the classic choice among many baristas for its ability to offer multiple benefits in a single package.

As you can see from the picture above, the group head has a number of notches. The portafilter is placed in these notches and then twist the head to secure it. There is also a gasket made from rubber in the notches, which helps create an airtight seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is essential for an efficient extraction.

Apart from allowing you effortlessly insert your portafilter 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, making sure that it is always at the correct temperature for extraction. This is important, as even a small difference in temperature can make the difference between a excellent and great espresso.

The Pump

Contrary to manual piston machines which rely on a lever that pressurize water, the rotary espresso machines use motorized pumps to supply the nine atmospheric bars of pressure that are required to extract espresso. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.

Pumps are typically less expensive and last for longer than piston-driven machines. However, both kinds of machines can deteriorate due to excessive use and poor cleaning. Pumps are also more complicated mechanically, and can add to the price of even the most basic models.

Some espresso machines make use of steam pressure instead of a pump for brewing espresso. The disadvantage of this is that the boiler that produces steam also raises the temperature of water to the point of boiling, which can lead to over-extraction. In addition the machines often have to restore their pressure between cups, which takes time and energy.

Many espresso machines employ either a rotary or vibration pump, which is a vibration model that uses a vibrating disc to generate the pressure and rotating models that push hot water through the grounds at high speed. Both machines can make great retro espresso machine, but rotary machines are quieter, more durable and less likely to break.

The Boiler

The boiler heats the water to the ideal temperature for extraction. The steam created is then directed to the portafilter, which holds the espresso grounds. The steam is then channeled into the cup. In this process, the steam causes pressure to push through the grounds of the coffee for espresso machine. This creates a layer crema that is then poured over. This is one of the hallmarks of a great espresso.

There are three kinds of espresso machines, each with distinct pumps and the temperature of the brew. There are different ways to control the brew as well as the size of cup that can be produced by the machine.

The first espresso machines were steam-types. The earliest espresso machines were steam types. The coffee tasted bitter and Best Cheap Espresso Machine burnt. The modern espresso machine was designed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp the beans on your own while the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanised consistency.

The Filter

Typically, buy espresso machine machines use filters to separate the grounds of coffee when they pass through the hot water. The filter is also a vital component of the machine's temperature control, since it stops overheating.

It also enhances flavor, since a filter allows for a more prolonged bloom phase. This lets the beans release their nuances, and allows for a better extraction.

It is important to remember that even the finest filter can produce a bad cup of coffee. The quality of the beans, and the extraction, remain crucial.

It's in this area that the magic occurs. This is the reason why espresso tastes so delicious. The grouphead, sometimes called the brew head, is where the portafilter (the thingy you put the coffee grounds into) is located when you're making espresso.

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

In recent years, compressed air-driven espresso machines have been gaining popularity. They use an air compressor to push hot water through the ground. They are also more mobile than electric steam-driven espresso machines.