求翻译：4、自动清洗筛孔，能获得优质浆料，减少纤维流失，可除去90%以上的杂质，提高纸品质量。是什么意思？

4, automatic cleaning sieve, to obtain a high quality slurry to reduce fiber loss, can be removed more than 90% of impurity, improving the quality of paper products.