• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

How Does Machine Espresso Work?

Machine espresso employs precise pressure and mind-blowing filter technology to create the perfect cup of coffee. What exactly is it that makes it work?

In order to make espresso home machine hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the main difference.

The Head of the Group

The name implies, the group head is the place you put your portafilter in when brewing espresso maker barista. It is responsible for dispersing water into the portafilter before controlling the pressure of the resulting extraction. There are a variety of types of group heads, each with their particular advantages and disadvantages. Some are focused on temperature stability, whereas others on pre-infusion features, and others are designed to control the lever. Some have a combination, like the E61. This is a favorite among baristas due to the fact that it has multiple benefits in a single package.

As you can see from the image above the head of the group is fitted with a variety of notches. It is possible to place your portafilter inside these notches, and then twist the head to lock it. A gasket made of rubber is positioned inside the notches, which helps create a seal while you insert your portafilter. The notches on the head allow for a precise placement of the portafilter, which is crucial to ensure an even extraction.

The group head does not just allow the portafilter to be inserted easily however it also keeps a constant temperature. This is achieved by cycling hot water around the portafilter and through the brew basin, ensuring that the temperature is always at the right level to extract the coffee. This is important because even a small difference in temperature can mean the difference between excellent and great espresso.

The Pump

Motorized pumps in rotary espresso machines supply the nine atmospheric bars of pressure required to extract espresso. This is different from manual piston machines which use a lever. This pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger prior to it is shot through the ground coffee inside the group head.

Pumps tend to be less expensive and last longer than piston-driven machines. However, both types of machines can deteriorate because of frequent use and inadequate cleaning. They also increase the complexity of mechanical systems and can lead to an expensive price for even the most basic models.

Some espresso machines employ steam pressure instead of a pump in order to brew espresso. This can lead to over-extraction as the boiler that makes steam also causes the water to boil. They also have to continuously rebuild their pressure between cups. This takes energy and time.

A majority of espresso machines utilize an rotary or a vibration pump. A vibration model utilizes an oscillating disk to create pressure, while the rotating model pushes hot water through the ground at high speed. Both machines can produce excellent espresso and filter coffee machine, however rotary machines are quieter, more durable and less likely to break down.

The Boiler

The boiler makes the water warm to the perfect temperature for extraction. The steam that is produced reaches the portafilter, which contains the ground espresso coffee espresso machines and is then funneled down into the cup. The steam causes pressure to push through the coffee grounds. This results in a crema on the top of the espresso. This is the hallmark of a great espresso.

There are three types of espresso makers. They differ in the type of pump they employ and how hot the coffee is. There are a variety of ways to control the amount of brew, as well as the size of cup that can be produced by the machine.

The first espresso machines were steam-type. They employed one boiler to create both steam and brew, however, the pressure they could generate was low - only two bars of atmospheric pressure at most. This resulted in the coffee tasting bitter and burnt. This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most common espresso maker is a semiautomatic machine that has an electric pump. These are what people imagine when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans by yourself however the pump controls the water flow and pressure. This is an excellent compromise between human touch and the mechanised accuracy.

The Filter

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

A filter can also help with flavor, as it permits an extended flowering time. This lets the beans release their nuances, and also allows for better extraction.

It is important to remember that even the most efficient filter could result in a poor cup of coffee. The quality of the beans, as well as the extraction, remain vital.

This is where the magic happens, and it's what makes an espresso really taste great. The grouphead, sometimes called the brew head, is where the portafilter (the thingy you put the coffee ground into) sits when you're making espresso.

In the steam-driven espresso machine hot water is heated in an airtight container to create steam, which is then pushed through the grounds at a high pressure. These kinds of machines tend to be less expensive and simpler 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, compressed air pump-driven espresso machines have been gaining popularity. They make use of an air compressor to force hot water into the ground and are more mobile than steam-driven electric espresso machines.