Coffee Roaster Buying Guide

Coffee Roaster is a machine that can make you available different flavors of coffee in the comfort of your home by roasting the coffee beans. Coffee roasting is a process in which the moisture of the green coffee beans is driven off by exposing them to warming process and then the dried beans are heated at 400F which brings a chemical change through thermal decomposition or Pyrolysis.

Source: Coffee Tasse

History of Coffee Roaster

The coffee roasters first came into existence in Germany in 1875 when the regulation was conceded for the trades of roasted coffee. Before that, there was no trait of buying the roasted coffee until late 1800’s because the only way to make certain that the coffee is in the pure form without any cereal mixing was buying the green coffee. People used to roast the coffee manually at their homes with the help of available devices.At the time of their existence, the coffee roasters were simply made of large cylinders which were used to heat the beans by placing them on the heat source. But emptying and cooling the beans was a hassle then. This problem was removed with the entry of American Carter Roaster in which the cylinder was emptied by pulling it out of the flame and beans were dumped directly into the tray or on the floor to cool.

The modern roasting machine began to gain its shape in 1864 with the improvements done by Jabez Burns of New York. These improvements made it possible to get the cylinder emptied even without removing it out of the flame. The double screw was implemented inside the cylinder, so that, the beans can get equally distributed. To dry the beans, a cooling tray and fan were also mounted on the cylinder.

In the early 1880’s, the German manufacture Van Gulpen brought the biggest change in the design of the coffee roaster by introducing an exhauster within theroaster to draw out the hot air. After that in 1889, the Carl Salomon of Braunschweig brought the process of quick roasting by introducing the hot gas ventilation principle. For the next century, all the new roasters experienced some variations while employing this design. In the conventional coffee roaster, the mechanical movement of the beans is combined with the hot air stream to operate the roaster.

The technologies on which the roasters work

The different technologies on which the various roasters work are drum, centrifugal, tangential and continuous. In the drum roasting technology, a typical cylindrical drum is made to rotate horizontally on an axis; the beans are mixed with the help of paddles or vanes;heated air is passed through the drum and byproducts are removed from it. The drum roasters are further classified into two types:

  • Solid drum roasters
  • Perforated drum roasters

In solid drum roasters, heat is transferred straightforwardly through a solid drum while in perforated roasters; the heated air is made to recirculate around the beans.

Reasons for the popularity of Drum Roasters

  • The capacity of these roasters is small which makes them more suitable for small as well as midsize businesses. Also for large business, a number of such roasters can be implemented.
  • The drum roasters are not much fuel efficient, but even then they are more affordable.
  • It is good choice for those roastmasters who have some artistic talentbecause due to manual control options it makes possible for them to achieve the desired coffee profile by manipulating the eyeball samples and dampers mid-roast.
  • There is a great demand of dark roasts and you will be amazed to know that the drum roasters are efficient and ideal for that because it will take just 8 to 20 minutes to prepare dark roasts by using solid drum roasters which is comparatively less time than other roasters.
  • In the drum roasters, the convective heat transfer is less as compared to other roasters which is about 85 % percent and the rest transfer of heat is made to happen through conduction or the heat get transferred from bean to bean. As a result of constant contact between beans, the flavor compounds get transferred equally among beans.

Must know things which you may or may not know about coffee roasting and roasters

You will be amazed to know that during roasting, the size of the beans gets doubled and weight is loosened by 25%. Here, let me tell you some more interesting things regarding coffee roasting:

  • The beans should be rapidly cooled when the precise color for them is attained. It is to prevent them from further darkening as their color continues to become dark, even if they have been brought out of the roaster.
  • The dark roasts have less caffeine because the amount of caffeine is reduced in the roasts as the beans are roasted longer.
  • Before you put the beans in the roaster for heating, it is extremely necessary to heat it up to prevent your beans from becoming insecure.

Where to buy coffee roasters

Roasting the green coffee beans is extremely beneficial as they can be roasted when required. Thus, you can have ultra fresh and desired quality roast. There are a number of online sites where you can find the roaster of your choice without any difficulty. In addition, you can also come up with the variety of roasters at nearer physical stores.You should keep these points in mind when purchasing a coffee roaster:

  • Check the efficiency of the roaster.
  • Analyze the control operations and functions it is providing to you.
  • Can you see clearly into the roasting chamber?
  • Can the machine parts be cleaned easily?
  • How much smoke does it produce?
  • If there is any program for it’s functioning, does it work well?


Functions of a coffee roaster

The basic function of a coffee roaster is to roast the coffee. As mentioned earlier, in the roasting process, green coffee leaves are dried to extract the moisture. The dried leaves are then warmed and heated at 400F.

Everyone loves to enjoy a cup of steaming hot of coffee. It is the master mind – coffee roaster, behind, which makes coffee available to you.

Author's Bio: 

I am a coffee lover from Singapore. I love coffee so much so that I have travelled throughout the Asian region researching about coffee beans