The Expert Guide To Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and amazing filter technology to make the coffee we love. What exactly is it?

Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to that of making drip coffee. However, the pressure is the primary difference.

The Head of the Group

The group head is the portafilter that is inserted when you are making espresso. It disperses the water into the portafilter, and regulates the pressure of extraction. There are numerous kinds of group heads each with distinct advantages and disadvantages. Some focus on temperature stability, while others on pre-infusion capabilities, and still others are designed to control the lever. Some include a mix of features, such as the E61 one, which is the classic choice among many baristas for its ability to offer multiple benefits in a single package.

As you can see in the photo above the group head comes with many notches in which you can place your portafilter before twisting it with your hands to secure it. A gasket of rubber is situated in the notches to create a seal as you insert your portafilter. The notches permit the precise placement of the portafilter. This is vital for an accurate extraction.

Aside from allowing you to easily connect your portafilter, the group head is also responsible for maintaining a consistent temperature. It does this by cycling hot water through the brew container and around the portafilter, ensuring that it is always at the right temperature for extraction. This is important, as even a small difference in temperature can make the difference between good and excellent espresso.

The Pump

In contrast to manual piston machines which use a lever to pressurize water, the rotary espresso machines use motorized pumps that provide the nine atmospheric bars of pressure needed to extract espresso. The pressure builds by removing tap water from a reservoir and pumping it through a heat exchanger before being pumped through the ground coffee inside the group head.

Pumps tend to be cheaper and last longer than piston-driven machines. However, both kinds of machines can deteriorate due to overuse and insufficient cleaning. They also make mechanically complex and can lead to a high price tag on even the most basic models.

Certain espresso machines remove the pump completely and instead utilize steam pressure to make espresso. The downside is that the same boiler that produces steam also raises the temperature of water to boiling, which can lead to excessive extraction. The machines must also constantly rebuild their pressure between cups. This requires energy and time.

Many espresso machines use an rotary or a vibration pump. A vibration model utilizes the vibrating disk to create pressure, while a rotary model pushes hot water through the ground at a high speed. Both machines can produce excellent espresso but rotary machines are quieter, more durable and less likely to break down.

The Boiler

The boiler is the one that heats the water to the right temperature for extraction. The steam created reaches the portafilter, which contains the espresso coffee grounds. It is then poured into the cup. The steam generates enough pressure to push the grounds of the coffee through. This results in a layer of crema on top. This is a hallmark of a great espresso.

There are three kinds of Espresso Makers (Http://Hl0803.Com). They differ in the kind of pump they use and the degree of heat that the coffee is. There are also different ways that the brew may be controlled as well as the size of the cup the machine can make.

The first espresso machine coffee machines were steam types. The first espresso machines were steam-type machines. This led to the coffee tasting burnt and bitter. This is the reason Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known espresso maker is a semi-automatic machine that has an electric pump. These are what people imagine when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans yourself however the pump controls the water flow and pressure. This is an excellent combination of human control and mechanised accuracy.

The Filter

Typically, retro espresso maker machines have a filter to separate out the grounds of the coffee as they go through the hot water. The filter is also a crucial element of the temperature control system as it keeps the machine from overheating.

It also helps with flavor as a filter allows for a longer bloom phase. This allows beans to release their flavors and provides an opportunity to improve extraction.

However, it is important to remember that even a good filter can make a terrible cup of coffee, since the quality of the beans and extraction are vital.

It's here that the magic occurs. This is the reason why espresso tastes so delicious. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy used to place the grounds of coffee into when making espresso.

Steam-driven espresso machines make use of hot water heated in an airtight container 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 pump-driven models. They are however limited to create 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 and filter coffee machine machines driven by a compressed air pump have become increasingly popular. They use an air compressor to force hot water through the ground and are more mobile than electric steam-driven espresso machines.