The roasting curve is a record of relevant data such as the temperature change in the furnace and the corresponding time during the coffee roasting process. According to the recorded information, we can track the stages of coffee roasting in real time, judge the roasting situation, and then formulate a subsequent roasting plan for later reproduction or adjustment.
As shown in the figure, the horizontal axis represents time, and the vertical axis represents temperature. The curve can record the key points in the roasting process, such as the temperature of the beans entering, the temperature returning, the first cracking point, the second cracking point, the bean output temperature, and so on. The degree of change of the curve reflects the rate of temperature rise. The steeper the curve, the faster the temperature rise, that is, the shorter the time for each temperature rise; on the contrary, the slower the curve, the slower the temperature rise.
Such a roasting curve can be drawn by manually recording the data every small fixed time. But now many roasters can already display the roasting curve in real-time on the basis of real-time monitoring of temperature and display time. In addition, more abundant data can be displayed, including heating rate, boiler speed, damper size, and so on.
The development and changes of coffee during the roasting process affect the expression of the final coffee flavor. The different densities, moisture content, water activity, and processing methods of green beans will also affect their roasting. Therefore, roasters not only need to master the roasting curve but also need to understand the characteristics of coffee, so that they are more likely to make correct judgments and make appropriate adjustments to the roasting situation.
Our coffee roasters use Omron temperature controlling system and the real-time temperature can be accurate to one decimal place. Here is our video for your reference:https://youtu.be/dzlh1u6NCGQ Besides, our coffee roaster equipment is also suitable for most types of software, e.g. Artisan is free to use, and all data relevant to roasting is saved, allowing it to be accessed and analyzed at any time.