How to use the Galanz coffee oven after a break
How to use the Galanz coffee oven after a break
In the evolution of the coffee machine for nearly a century, the Italians found that due to the use of additional 8-9bar pressure to force water quickly through coffee powder, pressure-rich water and coffee powder produced an average resistance, reducing the extraction time of each cup of coffee to 25 seconds and making the coffee powder as soft as flour to improve the extraction rate. At the same time, it condenses the aroma and gum in the coffee, producing a layer of ochre red Krima on the coffee. Because of this layer of Krima, Espresso is displayed as a thick colloid, which is closely integrated with the rich milk foam, creating all kinds of Italian coffee, including cappuccino.
The hot water for brewing coffee is too hot, resulting in the loss of oil.
The steam boiler cannot provide enough pressure.
Even so, exerting extra pressure to shorten the time it takes to brew coffee is still worth the effort. Just don't use steam, what should be used as a source of pressure? The further question is: how much pressure does it take to get the best extraction rate?
Another way to generate more pressure than 1.5 atmospheres is to use compressed air. For example, a home coffee machine in Milanes collector Ambrogio Fumagalli uses an air pump to pressurize hot water for brewing coffee (during World War II). In 1938, Francesco IIIy made the llletta' Coffee Machine, a large commercial coffee machine based on the principle of compressed air. When the crossbar on the coffee machine was lifted before World War II, water was injected into the space occupied by the piston and pressed down, and the pressure on the piston injected water evenly into the coffee powder in the filter. this means that hot water can brew coffee before it boils without scalding the coffee powder. At the same time, Achille Gaggia, the owner of a cafe in Milan, used a similar method to brew coffee. This method is gradually adopted by other coffee machine manufacturers, so this new coffee machine is also gradually replacing the steam pressure coffee machine. Today, the application of this principle can still be seen on household machines-La Pavoni.
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