2)研究网点磨损与网目线数对印刷质量和印版耐印力的影响，提出要保证合格的印刷质量和较高的印版耐印力需要选择合适的网目线数。

• 2) The dot wear and the screen ruling may influence printing quality and plate life. The accurate choice of screen may help to prolong plate life.