Recently, Guangdong Taigang Technology officially released a professional atlas of frequent defects in film coating industry, systematically sorting out six typical production flaws including machine-direction streaks, orange peel, craters, thick edges, fish eyes and wrinkles. It elaborates defect morphology, formation mechanisms and standardized countermeasures, serving as a process diagnosis manual for manufacturers of optical films, lithium battery electrodes and functional films. Defects such as stripes, pits and particles have long restricted product yield in coating lines. Most factories blindly adjust equipment parameters while ignoring root causes including substrate matching, slurry performance, workshop cleanliness and tension control. The atlas clarifies the source of each defect: machine-direction streaks are mainly caused by die lip contamination, craters stem from surface tension mismatch and pollution, thick edges are driven by coffee ring effect, and fish eyes result from poor slurry dispersion or airborne dust. Practical optimization solutions are provided, covering die maintenance, segmented oven temperature control, multi-stage filtration and tension curve calibration. It also answers common production puzzles to help factories locate faults rapidly, cut trial losses and raw material waste. The technical document is open to the whole coating industrial chain. For more information, please visit https://v.douyin.com/cqWECsXikiE