工艺参数对针刺过滤毡孔径及透气的影响

Effect of technological parameters on pore diameter and ventilation of needled filtrated felt

为了探究针刺密度、混合比、热轧工艺对针刺过滤毡孔径及透气性能的影响,以涤纶纤维、ES纤维为原料,设定混合比为30∶70,50∶50,70∶30,通过非织造针刺工艺,制备5种不同针刺密度的针刺过滤毡样品.然后选择涤纶与ES纤维配比为50∶50的10种样品进行热轧处理(热轧温度为170℃)及测试.结果表明,热轧前后样品的平均孔径都随着针刺密度增加呈多项式关系下降,最大孔径都随着针刺密度增加呈指数关系下降;透气性随着针刺密度增加呈多项式关系下降.但在热轧前随着针刺密度的增加,孔径和透气性能降低的幅度都较大,而热轧后随着针刺密度的增加,孔径和透气性降低的幅度都较小;在相同针刺密度下,样品的平均孔径和最大孔径都随着较细纤维比例的增加而减小.

In order to explore the effect of acupuncture density,different mixing ratio,hot rolling process on the pore size and the permeatility of needle punched filter,taking the polyester fiber,ES fiber as raw materials,mixing ratio 30∶70,50∶50,70∶30,through nonwoven needle acupuncture process,the needle punched filter samples with five different needling density are prepared.Then,ten samples with proportion 50∶50 of polyester fiber and ES fiber are selected for hot rolling(hot rolling temperature is 170℃).A total of ten samples were prepared and tested.The results show that before and after hot rolling,with the needle density increasing,the average pore size has a polynomial decrease,the maximum pore size exponentially decreases and the permeability has a polynomial decrease.Before hot rolling,with the increase of needling density,the permeability and the pore size decrease greatly.After hot rolling,with the increase of the density of acupuncture,the permeability and the pore size decrease slightly.In the same needle density,average pore size and maximum pore size decrease with the increase of the proportion of fine fiber.