The Comprehensive Guide To Machine Espresso > 자유게시판

How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and a filtering system that is awe-inspiring to create the coffee you love. How does it work exactly?

Espresso is made by pushing 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 Group Head

The group head is the portafilter you put in when making espresso. It distributes water into the portafilter, and regulates the pressure of the extraction. There are many different kinds of group heads each with its unique advantages and disadvantages. Some focus on temperature stability, whereas others on pre-infusion options, and others are designed to control the lever. Some are a combination, such as the E61. This is a popular choice among baristas due to the fact that it has multiple benefits in a single package.

As you can see in the above image, the group head has many notches in which you can place your portafilter before twisting it manually to secure it. A rubber gasket is located inside the notches to help create a seal as you insert your portafilter. The notches on the head allow for an exact placement of the portafilter, which is vital for an even extraction.

In addition to allowing you to easily insert your portafilter, the group head is also responsible to ensure that the temperature remains even. This is done by cycling hot water around the portafilter, and through the brew-basket to ensure that the temperature is always at the right level for extraction. This is important because even a few degrees can be the difference between a good and great espresso.

The Pump

The motorized pumps used in espresso machines rotary provide nine atmospheric bar pressure required for espresso extraction. This differs from manually operated piston machines that employ a lever. The pressure is created by removing tap water from a reservoir, and pumping it through a heat exchanger before being pushed through the ground coffee inside the group head.

Pumps tend to be less expensive than piston-driven machines, and tend to last longer, but both types of machines can get damaged through overuse and lack of cleaning. Pumps are also more complicated mechanically, which can increase the price of even the simplest models.

Certain discount Espresso machines machines utilize steam pressure instead of a pump in order to brew buy espresso machine. The disadvantage of this is that the boiler that produces steam also increases the temperature of water to the point of boiling which can cause over-extraction. In addition the machines often have to restore their pressure between cups, which takes time and energy.

Many espresso machines make use of the rotary or vibration pump. A vibration model utilizes a vibrating disk to generate pressure, whereas a rotating model pushes hot water through the ground at a high speed. Both types of machine can make a great espresso coffee machines, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the one that will heat the water to the right temperature for extraction. The resultant steam then reaches the portafilter that contains the ground espresso coffee and is then pumped down into the cup. The steam creates pressure and pushes through the grounds of the coffee. This creates a crema on the top of the espresso. This is one of the main characteristics of a great espresso.

There are three kinds of espresso machines, each having different types of pumps and brew temperature. There are various 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 type. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known espresso maker is a semi-automatic machine with an electric pump. When people think of espresso machines, they think of these machines. With a semi-automatic espresso machine, you must grind the beans and tamp them by hand, but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanized accuracy.

The Filter

Typically, espresso machines use filters to separate the grounds of coffee when they pass through the hot water. The filter is also a crucial element of the temperature control system as it prevents the machine from overheating.

It also enhances flavor as a filter can allow for a longer bloom phase. This allows beans to release their flavor and gives the chance for better extraction.

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

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

Steam-driven espresso machines make use of hot water that is heated in an airtight container to create steam. The steam then pushes hot water into the grounds of coffee at high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the perfect brewing conditions as they only operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bars.

In recent years, compressed air-driven compact espresso machine machines have become more popular. They utilize an air compressor to force the hot water through the grounds and are significantly more portable than steam-driven electric machines.