16 Must-Follow Pages On Facebook For Machine Espresso Marketers
How Does Machine Espresso Work?
Machine espresso uses precision pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How exactly does it work?
To make espresso, hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee and espresso maker. However it is the pressure that makes the main difference.
The Group Head
The group head is the portafilter that you put in when making espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure that results from the extraction. There are a variety of group heads each with its own advantages and disadvantages. Some are designed for stability of temperature while others are designed to handle pre-infusion. Some are designed to control the lever. There are some that come with a range of features, like the E61, which is considered the most popular choice among baristas for its ability to offer multiple perks in one package.
As you can see in the above photo The group head features numerous notches that you can put your portafilter, then twist it by hand to secure it. There is also a gasket of rubber which is located inside the notches and helps create a seal when you insert your portafilter into the machine. The notches allow for precise placement of the portafilter. This is crucial for an efficient extraction.
In addition to allowing you easily connect 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 container and around the portafilter to ensure that it is always at the right temperature for extraction. This is crucial, since even a few degrees can mean the difference between excellent and great espresso.
The Pump
The motorized pumps that are used in rotary espresso machines provide the nine atmospheric bar pressure that is required to extract espresso. This is different from manually operated piston machines that employ levers. This 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 inside the group head.
Pumps tend to be cheaper than piston-driven machines, and tend to last longer. However, both types of machines could degrade with overuse and insufficient cleaning. They also increase the complexity of mechanical systems and can lead to costly prices for even the most basic models.
Certain espresso machines do away with the pump completely and instead use steam pressure to brew espresso. This could lead to over-extraction since the boiler that produces steam also causes the water to boil. In addition the machines often have to rebuild their pressure between cups, which requires time and energy.
A large majority of espresso machines employ either a vibration or rotary pump. A vibration model employs the vibrating disk to create pressure, whereas a rotary model pushes hot water through the ground at a rapid speed. Both machines can make great espresso however rotary machines tend to be quieter, more durable and less likely to break down.
The Boiler
The boiler is the one that will heat the water to the perfect temperature to extract. The resulting steam is then transferred to the portafilter which holds ground espresso beans and is then pumped down into the cup. During this process, the steam creates pressure and pushes through the coffee grounds. This results in a whipped-up top of the espresso. This is one of the main characteristics of a great espresso.
There are three kinds of espresso makers, which differ in the type of pump they employ and how hot the espresso is. There are different ways that the brew can be controlled, as well as the size of the cup that the machine is capable of making.
The first espresso home machine machines were steam-type. They employed a single boiler to make both brew and steam, but the pressure they could produce was not very high end espresso machine, mouse click the up coming website page, - two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. The modern espresso machine was created by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso maker is a semi-automatic one that has an electric pump. This is what people envision when they think of an espresso maker. If you have a semi-automatic machine you grind the beans and then tamp them by hand, but the pump provides regulated water flow and pressure. This is a perfect combination of human control and mechanized consistency.
The Filter
Espresso machines usually have a filter that separates the grounds of coffee from hot water. The filter is also an essential element of the machine's temperature control, since it stops overheating.
A filter also helps with flavor, as it permits the beans to flower for a longer period of time. This helps the beans to let their nuances out and provides an opportunity for better extraction.
However, it is important to remember that even a top filter can result in a poor cup of coffee as the quality of the beans and extraction is crucial.
This is where the magic happens, and it's what makes espresso taste good. The grouphead, sometimes referred to as the brew head, is the place where the portafilter (the thingy you put the coffee grounds into) sits 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 pushes hot water through grounds of the coffee under 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 only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.
In recent years, espresso machines powered by compressed air-pump are becoming increasingly popular. They make use of an air compressor to push hot water across the ground and are more mobile than electric espresso maker steam-driven espresso machines.