Coffee Roasters & How To Roast Green Coffee Beans

Varying degrees of coffee roasting include:

Green Coffee Roaster :: Light Roast Coffee

The raw coffee beans do not get roasted long enough for any of the oils to break through the skins surface. The resulting light roast coffee beans will be light brown in color and will not have any surface shine. A light roast is seldom used commercially by coffee roasters, this is because it shows up many of the flaws naturally inherent in the raw coffee beans, many of these will often dissapear, or possibly be hidden by other flavors when further treated to a darker roast within the green coffee roaster.

Green Coffee Roaster :: Medium Roast Coffee

This medium degree of coffee roasting is sometimes referred to as the popular “American Roast”. As with the light roast coffee beans, there will also be no visible oils on the coffee beans surface and they will now be a medium brown color. This roast will produce a stronger flavor than that experienced in a light roast and is a great compromise of flavors where some coffee beans can react differently to both under (light roast) and over (dark roast) in coffee roasters.

Green Coffee Roaster :: Medium-Dark Roast Coffee

As it says, these style coffee beans will remain in the green coffee roaster for longer, allowing some of the oils within the coffee beans to now come to the surface. The beans will now take on a shiny apperance and will become dark brown in color. Coffee brewed with the medium-dark roast coffee beans will have a very slight bitter-sweet after taste. The medium or medium-dark roast coffee is normally the standard used to brew regular coffee by coffee roasters.

Green Coffee Roaster :: Dark Roast Coffee

Dark being the final variety produced in the green coffee roaster, also takes great skill so as not to over-cook in your coffee roasting machine. There's a high chance of losing the subtle and unique flavors in coffee beans if they are roasted for too long. The longer the roasting time, the darker the coffee beans then become. Also, coffee beans that have been dark roasted are usually shiny black in color, with an oily surface. The dark roasting process is normally only used for roasting coffee that is to be used in brewing espresso.

The individual coffee roasting companies design their own roasting profiles for each type of specialized coffee roasting. This is why a medium roast from one coffee roasting company or of one particular brand may taste different from a medium roast variety from another coffee roasting company, this is also a factor of the quality of their industrial coffee roasting machines. Simply put, the only difference between a light roast coffee and a dark roast is the temperature applied to the raw coffee beans and time duration of the roast thus the need for an accurate coffee roasting machine. You may find that occassionally, a light roast coffee will retain more of the original flavor that has been masked by the longer roasting time. When deciding on a coffee, don't simply let the color of the coffee beans be your only deciding factor.  It's the quality of the coffee beans combined with the talent of the coffee roaster that should really matter. This also applies for the selection of coffee roasting machine, in some cases, price can indeed reflect quality - of the end product!

How To Roast Coffee Beans :: A Coffee Roasters Guide

LEARN TO OPERATE YOUR COFFEE ROASTING MACHINE FIRST! (see demonstartions below - including the highlt favored Gene roaster) Green coffee beans are heat roasted in order to alter their physical properties into a revised product that is delicious and aromatic. Normally a green coffee bean will expand to twice its original size during the process of roasting. As it absorbs the heat, the raw coffee bean will begin to change colors. The greenish color will first shift from yellow, to a light brown shade, and finally it will take on a darker, oily color.

Oils will now appear on the surface of the roasted bean and the darkening will continue as long as the bean continues exposure to the heat. This is where the common coffee roasters terms "light roast" and "dark roast" come from. If a coffee bean is lightly roasted, it will maintain much more of its original delicate flavor. These are the flavors and characteristics a bean takes on according to it's specific growing location.

Coffee beans that take on a dark brown color have been roasted so long that the roasting flavor becomes more dominant and masks the original flavor. When this happens, it's hard to really tell what the origin of the coffee was. For instance, Kona, Java, Kenya, Arabica, Robusta and Blue Mountain Coffee of Jamaica all have very distinctive flavors and aromas, but over-roasting will dominate out these original regional flavors. Ideally, a medium roast is the best compromise of both worlds, this is a skill you will learn with your electric coffee bean roaster very quickly. The "Full City Roast" is considered an ideal choice because by coffee roasters as it is considered not too dark and not too light.

When professionals roast coffee whether it be in a small commercial coffee roaster or the industrial coffee roasters, it normally involves in intricate process of cleaning, roasting, grinding, and ultimately, the quality packaging of the final ground coffee bean product. The green beans are first dumped into a hopper and all loose debris is removed. These raw coffee beans are next conveyed on to a coffee bean roaster that typically operates at temperatures of between 350 degrees F and 540 degrees F depending on the intended flavor. The total roasting time of the coffee beans is not all that long. The beans might be roasted for a few minutes or possibly up to half an hour. Usually the coffee bean roaster is a mechanical rotating drum that tumbles the beans to ensure that they are roasted evenly all over.

Once the roasting operation is finished, the beans are next sprayed with purified water, dried, and run through a piece of equipment known as a "destoner." If any debris was originally missed in the first screening, the destoner will now remove it. From there on the roasted coffee beans are dried and either ground or packaged and sealed as whole beans.

See our exciting range including popular green coffee roasters like the Nesco coffee roaster and the Gene coffee roaster by Gene Cafe. If you are looking for a quality commercial coffee bean roaster why not try the Hottop drum roaster (Hottop Kn-8828p-2 Digital Drum Coffee Roaster). This is when you may want to consider wholesale green coffee beans in bulk - we are also a discount coffee bean supplier.

The Coffee Roaster

All green coffee roasters vary in size and capacity, but the roasting process changes little from one size to another. All equipment should be pre-heated to a roasting temperature some minutes before the green coffee beans are added, so all surfaces are uniformly hot. Many green coffee roasters are equipped with a revolving drum, often lined internally with curved metal strips which constantly toss the coffee beans towards the centre of the roasting drum. Above all, the beans must be kept moving if they are to roast evenly, without burning. In fact, if a drum stops revolving while the heat is still on and the beans are hot, there is a danger of instant combustion within the drum. Apparently there is a saying; "You're not a coffee roaster 'til you've had your first fire!"

Gene Cafe Coffee Roaster Demo - watch this home coffee roaster in action

Roasting Green Coffee Beans - color change progression of bean roasting process

Hottop Coffee Roaster Review - trade show demonstration displaying its quality and ease of use

Roasting Coffee Beans In A FreshRoast Plus 8 - Home roasted coffee, as fresh as it gets!

The Gene Cafe - Home roasting machine operational overview with raw coffee beans

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