凹板是指在雕刻的部分凹入版面的印刷板，如铜板、钢板、照相凹板。
adj. concave
misc. notch board ; recess plate
另外，作者还对提高凹板的分离能力作了实验研究。
Further research has been made by the author to improve the separating capacity of the concave through experiments.
利用本模型可以得到喂入轮的脱粒率对脱粒装置凹板的脱粒率及分离率的影响。
The influence of the threshing rate of the feed beater on the separating rate of the concave can be calculated by using this model.
本论文具体针对在凹板印刷机运转过程中的收卷放卷张力控制进行讨论与研究。
Main subjects discussed in this dissertation focus on the tension control in unwinding and winding processes for the gravure press machine.
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