It might be look easy to control the coffee roasting flame, but only roast masters know really how to play games on the coffee roasting machines.
Here you have a full guide for that :
Understand Your Roasting Equipment: Different roasting machines have varying heat sources and controls. Familiarize yourself with the specific features of your roaster, including the type of fuel (gas or electric), flame intensity adjustment, and airflow controls. Understanding these elements will lay the foundation for effective flame control.
Preheating the Roaster: Before you start roasting coffee, ensure your roaster is properly preheated. Preheating the roasting drum or chamber is crucial to avoid temperature fluctuations during the roast. It also helps in maintaining a steady flame throughout the process.
Establishing the Baseline Flame: Start with a low and steady flame to establish a baseline temperature. This will help you gauge the initial heat transfer and adjust as needed during the roast. Too high a flame at the beginning can lead to uneven roasting and undesirable flavors.
Monitoring Rate of Rise (RoR): The Rate of Rise (RoR) is the rate at which the temperature of the coffee beans increases during roasting. Keep a close eye on the RoR, as it indicates the intensity of the flame's effect on the beans. A steep RoR means the flame is too aggressive and may lead to scorching or baking the beans. Aim for a gradual and controlled RoR for even roasting.
Adjusting Flame Intensity: Throughout the roasting process, you'll need to adjust the flame intensity based on the desired roast profile. Gradually increase or decrease the flame to maintain the RoR within your target range. Avoid sudden changes, as this can shock the beans and negatively impact their development.
Managing First Crack: During roasting, the coffee beans undergo the first crack, which is an audible indication of moisture release. It signifies a critical point in the roasting process. Around this stage, it's generally advisable to reduce the flame slightly to control the buildup of heat and prevent scorching.
Emphasizing Airflow: Apart from adjusting the flame, controlling airflow is equally important. Proper airflow aids in maintaining an even roast by ensuring an even distribution of heat. If your roaster allows it, adjust the airflow to complement the flame adjustments and achieve consistent results.
Recording and Analyzing Roasts: Keep a detailed record of your roasting sessions, including flame settings, RoR, and any adjustments made during the process. Analyze the results of different flame manipulations to learn how they affect the final cup profile. This iterative approach will help you refine your techniques and find what works best for each coffee origin and bean variety.
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