色谱柱在工厂填装时，出口端的筛板孔径必须比色谱柱中最小颗粒的粒径还要小。
When the column is packed at the factory, the porosity of frit at the outlet of the column must be lower than the smallest particle size of the column.
报道了采用新型高分子材料聚四氟乙烯车削板为原料，机械加工生产高速晒图机的重要部件——大孔径聚四氟乙烯筛板的方法。
A method of machining to produce the big bore diameter PTFE sifter of the parts for high speed diazo printer was reported, by using polymer PTFE material.
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