An Engineering Analysis of Coffee Roasting Drums: Comparing Thermodynamic Characteristics by Structure and Material Coffee roasting is not simply a process of applying heat to green coffee. It is an engineering process that precisely controls thermal energy in order to bring about chemical changes inside the...
Executive Summary In 2025, the Korean cafe market reached a historic inflection point. For the first time since statistics began to be compiled, the number of coffee shops in Korea, which had kept growing for the past 20 years, has turned downward. As of Q1 2025,...
![[Coffee Roaster] Cast-Iron Drum vs. Stainless Steel Drum: Which Is Better? roasting machine 주물드럼 스텐드럼](https://siebenster.com/wp-content/uploads/2023/10/주물드럼-스텐드럼.jpg "[Coffee Roaster] Cast-Iron Drum vs. Stainless Steel Drum: Which Is Better? 3")
Today I sat down at the keyboard to take a deeper look at coffee roaster drums. What exactly is the difference between cast-iron drums and stainless steel drums, and why are these materials used? If you are going to use a cast-iron roaster drum, know why it...
![[Roasting] How to Roast Coffee Well roasting machine 로스팅0002로스터기](https://siebenster.com/wp-content/uploads/2023/10/로스팅0002로스터기.jpg "[Roasting] How to Roast Coffee Well 4")
Coffee Is Science Have you ever tried coffee roasting? As Gertrude Stein said, 'Coffee is more than a drink,' most of us first come to coffee captivated by its aroma and drawn in by its analog sensibility. I was no different. But once you go deeper into this...
![[Roasting] How to Make Coffee Beans Swell Bigger roasting machine 로스팅0001](https://siebenster.com/wp-content/uploads/2023/10/로스팅0001.jpg "[Roasting] How to Make Coffee Beans Swell Bigger 5")
Today I'd like to write about how to make beans swell bigger when roasting. A roaster is someone who roasts beans well, right? (Or at least someone who is trying to roast them well!!) What does it mean to roast beans well? Roasting them to taste delicious??? Ultimately, of...
![[Roasting] Correcting Roasting Defects After Cupping! roasting machine 로스팅0001디펙트](https://siebenster.com/wp-content/uploads/2023/10/로스팅0001디펙트.jpg "[Roasting] Correcting Roasting Defects After Cupping! 6")
Do you cup after roasting? In truth, it isn't as easy as it sounds. But when it comes to how important it is, you can never stress it enough! Ceaseless Check & Balance on your own roasting. That is the shortcut to improving your 'roasting ability.' There is always...
It is truly remarkable that people came to roast the seeds of a tree fruit and then drink them by filtering or steeping them in water. Since that discovery, the way coffee is roasted has also gone through many changes. Shall we take a brief look...