10 Facts About Machine Espresso That Will Instantly Put You In An Optimistic Mood > 자유게시판

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How Does Machine Espresso Work?

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

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 major difference.

The Head of the Group

The group head is the portafilter you place in the espresso maker when making it. It disperses water in the portafilter, and regulates the pressure of the extraction. There are various kinds of group heads each with its distinct advantages and drawbacks. Some are specifically designed for stability in temperature, while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some have a combination of features, such as the E61 that is the most popular choice among baristas because of its ability to offer multiple perks in a single package.

As you can see from the image above the group head is fitted with a variety of notches. You can place your portafilter in these notches, then twist the head to lock it. There is also a rubber gasket which is located inside the notches and helps create an airtight seal after inserting your portafilter into the machine. The notches allow for precise placement of your portafilter. This is essential for an efficient extraction.

Aside from allowing you to easily insert your portafilter, the group head is also responsible to ensure that the temperature remains even. It does this by circulating hot water through the brew basket and around the portafilter to ensure that it is always at the right temperature for extraction. This is vital, because even a few degrees can mean the difference between excellent and great espresso.

The Pump

The motorized pumps in espresso machines rotary provide nine atmospheric bars of pressure required for espresso extraction. This differs from manually operated piston machines that employ a lever. The pressure is created by drawing 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 are typically less expensive and last for longer than piston-driven machines. However, both types of machines can deteriorate due to excessive use and insufficient cleaning. Pumps are also more complex mechanically, which can raise the cost of even simplest models.

Certain espresso machines remove the pump entirely and utilize steam pressure to make espresso. The drawback is that the boiler that produces steam also increases the temperature of the water to boiling and espresso maker can result in excessive extraction. In addition, these machines frequently have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines make use of the rotary or vibration pump. A vibration model uses the vibrating disk to create pressure, whereas a rotary model pushes hot water through the ground at a rapid speed. Both models can produce an excellent espresso, but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats water to the optimal temperature for extraction. The steam produced gets to the portafilter which holds the espresso grounds. It is then poured into the cup. The steam is able to create enough pressure to push the coffee grounds through. This results in a whipped-up the top of the espresso. This is one of the main characteristics of a good espresso.

There are three types of espresso makers. They differ in the type of pump they employ and the degree of heat that the coffee is. There are different ways that the brew can be controlled and the size of the cup that the machine is capable of making.

The earliest espresso machines were steam type. The first mini espresso machine machines were steam-type machines. This resulted in the coffee and espresso maker tasting bitter and burnt. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic machine with an electric pump. These are the images people have when they think of an espresso maker. Semi-automatic machines require you to grind and tamp your beans yourself however the pump controls the flow of water and pressure. This is an excellent combination of human control and mechanized reliability.

The Filter

Typically, home espresso machine machines employ a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital part of the temperature control system, as it prevents the machine from overheating.

A filter also helps with flavor since it allows for an extended flowering time. This lets the beans release their flavors, and allows for better extraction.

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

It's in this area that the magic happens. This is the reason why espresso tastes so delicious. The grouphead (also called the brewhead) is where you put the portafilter, which is the thingy which you put the grounds of coffee into while making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to produce steam, which is then pushed through the grounds under high pressure. These types of machines tend to be less expensive and simpler to maintain than pump-driven models. However, they are limited in their ability to produce the perfect conditions for brewing, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.

In recent years, espresso machines powered by a compressed air pump have become increasingly popular. They utilize an air compressor to force hot water through the ground and are much more mobile than steam-driven electric espresso machines.