Root-cause Tree for Overheating & Band Misalignment in Flame Coloring
火焰着色过烧与色带错位根因树
标签：过烧, 色带错位, 根因分析, 缺陷诊断, 火焰
火焰着色缺陷按"热源→走速→基材→环境"四层排查。过烧起鳞（灰黑膜起皮）：焰距小于 5 cm 或单点驻留超 2 s，红外枪读数超 400 °C 须立即撤离火焰，轻者可退火重烤、重者酸洗重来；色带错位与四边色深：板材边缘散热快，着色前整体预热至 60–80 °C 可消除；水渍状暗斑：压缩空气含水或板材汗渍，气路加装油水分离器并全程戴手套；忽明忽暗条纹：气瓶压力随消耗下降，改双瓶并联或加恒压阀。每例缺陷附红外热像存档，三个月即能积累出本车间的"温度-缺陷"对照表。
Debug flame coloring through four layers: heat source → travel → substrate → environment. Scaly over-burn (grey film lifting): nozzle under 5 cm or dwell over 2 s; past 400 °C on the IR gun, pull the flame at once — mild cases re-bake, bad ones re-pickle. Band misalignment with dark edges: fast edge cooling — pre-heat the whole sheet to 60–80 °C. Watery dark blotches: moisture in compressed air or sweat — add an oil-water separator and glove up. Flickering stripes: tank pressure droop — parallel two bottles or fit a regulator. Archive an IR thermograph per defect; three months yields a shop-wide temperature-defect reference table.