Coffee roasteries

For a good coffee, the perfectly roasted bean is essential!

The roasting of raw coffee beans takes place in special roasting machines. Coffee beans placed in a rotating drum are heated to an internal bean temperature of 200 to 1000°C, depending on the roasting process. The hotter the raw beans are roasted, the faster large quantities of beans can be refined (hot roasting). The gentler drum roasting takes more time and works with around 200°C.

During the roasting process, the desired roasted aromas are created, and each bean loses up to 20% of its weight, primarily in the form of oil and water. The released fatty gas must be transported outside through a high-temperature-resistant exhaust system.

Over time, fats and moisture build up, increasing the risk of fire, which is why regular maintenance and chemical cleaning of the exhaust pipe by specialists are required.

To keep the pipe system airtight during the cleaning process and avoid unpleasant odors in the installation room, a pressure-tight exhaust system is necessary. This is even more crucial if the roaster has an integrated fan. However, systems with conventional silicone or EPDM seals cannot be used here, as they could be damaged due to the potentially high temperatures of the exhaust gases.

A clear case for our stainless steel exhaust system DW-KL, which is pressure-tight up to 5000Pa with its metallic conical connection. As a double-walled exhaust system, it also features a mineral insulation layer between the inner and outer pipes, reducing temperature transfer and noise transmission to the installation room.

For coffee roasters operating under negative pressure, the systems DW-FU and DW-ECO 2.0 are good alternatives.