Diagnosing Blurry or Uneven Imprints
压印纹理模糊与深浅不均的诊断
标签：纹理模糊, 压力不均, 退火, 缺陷诊断
压印发糊三大根因：①母本含水——鲜叶未压干，汁水在 0.2 mm 深处形成缓冲层，先 40 ℃ 烘 20 min 或压花器干燥 48 h；②铜板未退火——加工硬化态铜（HV 110 以上）吃纹浅，850 ℃ 烧红水淬后降至 HV 60 左右，纹理清晰度可提升近一倍；③辊距单边偏差——调平螺丝松旷时，用双层卡纸左右两端各轧一次，厚度差超 0.03 mm 即需紧固。若深浅不均呈规律条纹，则查辊面划伤，以 1200 目油石顺辊轴方向修整。
Three causes of muddy imprints: a wet master—undried leaves leave a sap cushion at 0.2 mm depth; oven-dry at 40 °C for 20 min or press 48 h. Unannealed copper at 110+ HV takes little texture versus about 60 HV after an 850 °C quench—clarity nearly doubles. And single-side roll-gap error: test with double-layer card at both ends and re-tighten if thickness differs over 0.03 mm. Regular banding points to scored rolls, dressed lengthwise with a 1200-grit stone.