It was studied that the effect of the modified st arch and micro-particle retention system on Fines retention of mechanical pulp in this paper.

就变性淀粉及其微粒助留系统对机木浆的助留效果进行了初步的探讨。

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In the paper, the effects of the ion type of polyacrylamide on retention of fines in the corrugated medium paper and the properties of the paper were studied.

研究了不同离子类型的几种聚丙烯酰胺对瓦楞原纸中细小组分的留着作用以及其对纸张性能的影响。

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These agreements are be reviewed and approved by the Office For Fair Access (Offa) each year, with institutions that fail to meet their agreed targets on recruitment and retention facing fines or losing the right to charge higher fees.

BBC: University students: Fines over access threatened