目的 采用激光直接雕刻3D网点制版方式实现金属易拉罐网点扩大的控制。方法 以铝质易拉罐为承印材料，改变3D网点的形状、戴帽、雕刻侧峰角度等参数后进行制版和印刷，对印品的网点扩大进行测量和分析，以确定最佳的制版参数。结果 圆方形网点在50%中间调的表现优于圆形网点的，“戴帽”网点的还原效果优于“无戴帽”网点的，雕刻侧峰角度80°的网点比雕刻侧峰角度50°的网点扩大值小。结论 在实际生产中，当加网线数和加网角度确定后，选择圆方形“戴帽”网点和较大雕刻侧峰角度有利于改善金属易拉罐的网点扩大。

The work aims to realize the control on dot gain of metal cans by laser direct engraving 3D dot plate making. With aluminum can as the printing material, plate making and printing were carried out by changing the parameters such as the shape of 3D dot, capping and engraving side peak angle. The dot gain of printed products was measured and analyzed to determine the best plate making parameters. The performance of rounded square dot in the middle tone was better than that of round dot, and the reduction effect of "capped was better than that of "un-capped dot with engraving side peak angle of 80° was smaller than that of dot with engraving side peak angle of 50°. When the number of screening lines and screening angle are determined, it is suggested to select rounded square "capped dots with large engraving side peak angle, which is conducive to improving the dot gain of metal cans in actual production.