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本文研究了聚丙烯熔喷工艺与纤网性能的关系,探讨了纤网定量对透气性的影响,并分析了纤维直径,纤网定量与纤网孔隙率的关系,为开发熔喷非织造布产品及工艺配置提供了方向。 相似文献
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Ultraviolet (UV) spectrophotometry was used to test the chromium (Cr) content of bast fiber by using diphenylcarbazide (DPC) as color reagent.The results showed that complexes were formed from Cr (Ⅵ) ions and DPC under phosphoric acid condition.There was a maximum positive absorption peak at 540 nm.Cr (Ⅵ) concentration ( in the range of 0.004-1.000 mg · L-1 ) and the absorbance of complex obeyed the Lambert-Beer law.The optimal technology was dropping volume of phosphoric acid 0.4-0.6 mL,DPC content 2.0-4.0 mL,and coloration time 5-10 min.The total Cr content in bast fiber samples from a Cr mine area was tested,and the results showed that the total Cr contents decreased along the water flow of river. 相似文献
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