Since its discovery in the Ethiopian plateau, coffee has been a preferred choice for many. Its effect in keeping someone alert is proven. Roasting of the green coffee beans brings out the sweet aroma and flavor that is hidden inside. It brings out the brown color that we fine in coffee beans. Once coffee is roasted, the levels of acids, sugars, protein and caffeine are minimized. Roasting is done with the use of coffee roasting machines. In order to get the best out of coffee, quality coffee roasters must be used. The different coffee roasters produce different outcomes. The temperature at which coffee is roasted also produces different roasts.
Types of coffee roasts
The different types of roasts include the light roast, the medium roast and the dark roast. The light roast comprises of the Cinnamon Roast and the Light Roast. The Cinnamon Roast is roasted at a very light level of 196 degrees Celsius. Sweetness is not fully developed and the beans have grassy flavors and sharp acidity is still prominent. The Light Roast produces light brown beans and is done at a temperature of 205 degrees. The Light Roast has complex acidity. The medium roast consists of the American Roast and the City Roast. The American Roast is done at 220 degrees Celsius, where it results to medium light brown beans. The acidity is slightly reduced at this point. The City Roast is done at 219 degrees Celsius to turn the coffee beans into a medium brown color. The original taste character is maintained but the roast character can be noticed easily.
The dark roast comprises of four types of roasts and they include the Fully City Roast, Vienna Roast, French Roast and the Italian Roast. The Fully City Roast is usually done 225 degrees Celsius resulting to a medium dark brown bean. The roast character is outstanding at this point. The Vienna Roast which is done at 230 degrees Celsius. The coffee beans at this point have a bittersweet caramel flavor and the acidity is totally neutralized. The French Roast turns the green beans into dark brown beans that are very shiny. It happens at 240 degrees Celsius. The roast character is dominant at this level. Just like the French Roast, the Italian Roast produces shiny beans but the difference is that this ones are almost black in color. The acidity is almost eliminated.
Roasting makes the chemical properties of coffee beans to change as they are quickly brought to high temperatures. When they reach the desired temperature point, they are quickly cooled to stop the process. The coffee beans weigh less than the original beans because moisture has been extracted from them. After the roasting process, the coffee beans are now in a state where they can be grounded and brewed. The new roast flavor starts to fade with time and so it is better to have the coffee beans used as soon as possible. Roasting is both an art and science which necessitates years of practice to become an expert at it. Perfect roasting can be ruined by a simple step.
Types of coffee roasters
There are basically five types of coffee roasters. They include the centrifugal roasters, the tangential roasters, drum roasters, packed bed and hot air roasters. The most common are the drum and hot air roasters. Coffee roasters can either operate in either continuous or batch modes. The drum roasters comprise of drums that rotate horizontally and tumble the coffee beans when heated. The heat source can come from a wide range including electricity, wood, natural gas or petroleum gas.
Most of the drum machines use indirect heated drums whereby the heat source is placed beneath. Some time back Direct fired were used and they operated in such a way that the flame contacted the beans while in the inside of the drum. They are rarely used nowadays. Hot air roasters and Fluid Bed roasters work in such a way that heated air is forced via a perforated plate beneath the coffee bean. The force is adequate enough to lift the beans. The coffee beans are heated on the fluidized bed as they circulate.
When you want a coffee roaster where little space is available, you might consider purchasing a small drum roaster or any other coffee roaster provided it’s small enough to fit in the specific area you want it to. Most drum roasters produce a batch of coffee each time. All coffee roasters have the capability of producing excellent coffee. The one thing that you should be mostly concerned with is the size of the coffee roaster. You should buy one that fits the available space and one that you can use comfortably. The cost might also be good to look and you can purchase a type of coffee roaster that does not dig too dip into your pockets.