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
凹板筛设于滚筒的外下侧并固定于机架上；
The horizontal fan is arranged on the frame at the lower side of the rolling tube.
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.
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