9 Lessons Your Parents Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

machine espresso (address here) uses precision pressure and mind-blowing filter technology to make the delicious coffee we enjoy. What exactly is it?

To make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the major difference.

The Group Head

The group head is the portafilter that you put in when making espresso. It disperses the water into the portafilter, and regulates the pressure during the extraction. There are many different types of group heads each with distinct advantages and drawbacks. Some are designed to provide stability in temperature, while others are built to handle pre-infusion. Others are made to control the lever. Some include a combination such as the E61. This is a very popular choice for baristas because it offers multiple advantages in a single package.

As you can see from the above photo, the group head is fitted with a variety of notches. The portafilter is placed into these notches and twist the head to lock it. A gasket of rubber is situated in the notches to create a seal as you insert your portafilter. The notches on the head allow for a precise positioning of the portafilter which is necessary to ensure an efficient extraction.

The group head does not just allow you to place your portafilter easily but also maintains the same temperature. This is done by cycling hot water around the portafilter and through the brew-basket, making sure that the temperature is constant to extract the coffee. It is important to remember that even a few degree deviation can make the difference between a great and a great pro espresso machine.

The Pump

The motorized pumps used in rotary espresso machines provide the nine atmospheric bars of pressure required for decent espresso machine extraction. This differs from manual piston machines which use a lever. The pressure builds by removing tap water from a reservoir, and pumping it through a heat exchanger prior to it is shot through the ground coffee in the group head.

Pumps tend to be less expensive than piston-driven machines and tend to last longer. However, both types of machine can degrade with overuse and insufficient cleaning. They also make mechanically complex that can lead to a high price tag on even the simplest models.

Some espresso machines remove the pump completely and make use of steam pressure to make espresso. The drawback of this is that the boiler that produces steam also raises the temperature of water bean to cup espresso machine boiling and can result in excessive extraction. Additionally, these machines frequently have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines make use of a rotary or vibration pump. A vibration model employs a rotating disk to generate pressure, while a rotating model pushes hot water through the ground at a fast speed. Both types of machines can produce an excellent espresso, but rotary machines are quieter and more durable than vibration pumps.

The dual boiler espresso machine

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

There are three different types of espresso machines, each with different types of pumps and the temperature of the brew. There are a variety of ways that the brew can be controlled as well as the dimensions of the cup the maker can create.

The first espresso machines were steam-types. The first espresso machines were steam types. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso maker is a semi-automatic machine with an electric pump. These are the images people have when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp your beans yourself, but the pump regulates the water flow and pressure. This is a perfect solution that combines human control with mechanized consistency.

The Filter

Typically, mini espresso maker machines utilize filters that separate the coffee grounds as they pass through the hot water. The filter is also a vital element of the machine's temperature control, since it stops overheating.

Filters also aid in flavor as it allows for an extended flowering time. This allows the beans to release their flavors, and allows for a better extraction.

However it is crucial to remember that even a high-quality filter could result in a bad cup of coffee, since the quality of the beans and extraction is vital.

This is where the magic happens, and it's what makes an espresso really taste great. The grouphead, often referred to as the brewhead, is where the portafilter (the thing you put the ground coffee into) sits when you're making espresso.

In a steam-driven espresso machine hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds at high pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the ideal conditions for brewing, as they 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 utilize an air compressor to push hot water through grounds and are much more portable than steam-driven electric machines.