16 Facebook Pages You Must Follow For Machine Espresso-Related Businesses
16 Facebook Pages You Must Follow For Machine Espresso-Related Businesses
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How Does Machine Espresso Work?
The machine espresso makes use of precise pressure, as well as a filtering technology that is amazing to make the coffee you love. But how exactly does it work?
Espresso is created by forcing hot water at high pressure through finely ground coffee. The process is similar to making drip coffee but the key difference is in the pressure.
The Head of the Group
The group head is the portafilter that you put in when making espresso. It distributes water into the portafilter, and regulates the pressure of extraction. There are various kinds of group heads, each with their unique advantages and disadvantages. Some are focused on temperature stability, some on pre-infusion capabilities, while others are designed to control the lever. Some include a combination such as the E61. This is a preferred choice for baristas due to the fact that it has multiple advantages in one package.
As you can see in the above photo The group head features many notches in which you can place your portafilter and then twist it by hand to lock it in. There is also a rubber gasket which is located inside the notches and helps to create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise location of the portafilter which is vital for an even extraction.
In addition to allowing you effortlessly insert your portafilter the group head is responsible for maintaining an even temperature. It does this by cycling hot water through the brew basket and around the portafilter, making sure that it's always at the right temperature to extract. This is vital, because just a few degrees could mean the difference between good and great espresso.
The Pump
The motorized pumps in rotary espresso machines provide the nine atmospheric bar pressure that is required to extract espresso. This is different from manual piston machines that use levers. The pressure builds up by drawing tap water from a reservoir and pumping it through a heat exchanger prior to being pushed through the ground coffee in the group head.
Pumps are typically more affordable and last longer than piston-driven machines. However, both kinds of machines may degrade due to overuse and insufficient cleaning. Pumps are also more complicated mechanically, and can add to the price of even the simplest models.
Certain espresso machines do away with the pump completely and instead use steam pressure to brew espresso. This can result in over-extraction because the boiler that produces steam also heats the water to boil. The machines must also continually rebuild their pressure between cups. This takes energy and time.
A majority of espresso machines use an rotary or vibrating pump, with a vibrating model that uses a vibrating disc to create pressure and a rotary model pushing hot water through the grounds under high speed. Both types of machine are capable of producing excellent espresso, however rotary machines are quieter and more durable than vibration pumps.
The Boiler
The boiler is the element that heats the water to the optimal temperature for extraction. The steam that is produced reaches the portafilter containing the ground espresso coffee, and is then pumped into the cup. The steam causes enough pressure to push the coffee grounds through. This produces a layer of crema on top. This is a sign of a good espresso.
There are three types of espresso makers, and they differ in the type of pump they employ and how hot the coffee is. There are various ways to control the brew as well as the size of the cup that can be made by the machine.
The first espresso machines were steam-types. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.
The most popular espresso machine is a semiautomatic model with an electric pump. When people think of espresso machines, they think of these machines. Semi-automatic machines require you to grind and tamp your beans yourself however the pump controls the water flow and pressure. This is a fantastic solution that combines human control with mechanized consistency.
The Filter
Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also a vital component of the temperature control system as it prevents the machine from overheating.
It also enhances flavor, as a filter lets you enjoy a longer bloom phase. This allows the beans to release their flavors, and improves extraction.
It is important to keep in mind that even the finest filter could result in a poor cup of coffee. The quality of the beans and the extraction process, are still very important.
It's in this area that the magic occurs. This is what makes espresso taste so good. The grouphead, also referred to as the brewhead, is where the portafilter (the device you put the coffee grounds into) is placed espresso machine with milk frother when you're making espresso.
Steam-driven espresso machines make use of hot water heated in an airtight vessel to create steam. The steam then moves hot water through the grounds of the coffee under pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. However, they are not as efficient in their ability to provide the perfect brewing conditions because they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bars.
In recent years, espresso machines powered by a compressed air compressor have become increasingly popular. They utilize an air compressor to push hot water through the grounds and are much more portable than steam-driven electric machines.