Abstract The TDS meter has become an essential tool in coffee extraction research and quality control, as it quantifies the proportion of total dissolved solids (TDS) in brewed coffee and provides an objective basis for brewing evaluation. Within the widely recognized Golden Cup Theory, TDS together with extraction yield (EY) serve as the two core indicators for determining whether coffee...
Abstract The development of Coffee Green Bean Density Measurement reflects the dual demand for Efficiency and Precision. The Displacement Method – Archimedes’ Principle reveals the physical essence of Density with high precision, making it suitable for Quality Assessment and Laboratory Testing. In contrast, the Volumetric Method – Free-Flow Bulk Density provides high efficiency to support large-scale circulation, making it more appropriate...
Accurately measuring water activity (aw) is essential for quality control, safe storage, and precise roasting of green coffee beans. Understanding the scientific principles behind aw measurement—and selecting the right method and equipment—is critical to ensuring reliable data. This article explores the core mechanisms of water activity meters, compares mainstream technologies, and highlights differences in precision among various approaches.
Abstract In coffee roasting, color change has always been a key indicator for determining the roast level. Traditionally, roasters rely on visual observation of the beans’ transformation—from the yellow-green of raw beans to light brown, dark brown, and even near black—combined with crack sounds and aroma for a subjective assessment. However, this method has significant limitations: Strong influence of lighting:...
Abstract The essence of coffee roasting lies in a series of complex, heat-induced chemical reactions, the most visually apparent of which is the color transformation of the coffee beans. To enable quantifiable control over the roasting process, the Agtron roast analyzer—also known as the Agtron Scale or coffee roast meter—was developed and has become an industry-standard tool for standardized roast...
As of 2025, the global market for coffee grinder motor drive types has become increasingly mature, with both manufacturing techniques and structural designs advancing toward precision and diversification. Numerous innovative grinder designs have emerged, such as ULTRA’s cost-effective direct drive system, SOU SIK P1’s use of a planetary gear motor for conical burr grinders, and BOOKO Motto80’s tapered burr mounting system,...
During the coffee grinding process, high-speed friction between the burrs and coffee beans generates significant static electricity. This is one of the primary causes of coffee grounds scattering, residue buildup, and uneven extraction. Finer particles, with their larger surface area, are especially prone to static charge accumulation, resulting in messy powder dispersion, ingredient waste, and inconsistent cup quality.
With prolonged use of a coffee grinder, its core components—the burrs—gradually lose their sharpness and begin to dull visibly. In some cases, chipping along the edges may also occur. This is particularly common in commercial espresso grinders, where burrs are subjected to heavy grinding loads, frequent cleaning, and repeated recalibration. Common wear issues include erosion in the triangular zone, coating...
What makes some burrs grind faster and more precisely than others? This article breaks down the geometry of coffee burrs—including crushing zones, dump powder channels, and grind paths—to reveal how they affect grinding efficiency across espresso and filter applications.
Understanding how a coffee roast color analyzer works—and what factors impact its accuracy—can help roasters achieve consistent, professional-grade results. This guide explains the principles behind NIR technology and shares expert tips for minimizing reading errors.
Learn how water activity impacts the Maillard reaction and the controllability of the roasting process in coffee. By accurately measuring water activity, optimize green bean storage and roasting rhythm to improve flavor and quality. Discover how LeBrew RoastSee AquaGauge helps enhance the roasting process.
