打孔和压花处理对热风非织造材料面层性能的影响

为给纸尿裤面层选择提供更好的依据,首先对平纹热风非织造材料面层的纤网微观结构进行分析,随后分别对平纹、打孔和压花3种热风非织造材料面层的机械、穿渗和液态水传递性能进行测试和表征。结果表明:平纹热风非织造纤网中纤维呈平铺态,纤维之间的黏结呈点状,液态水在纤网中的纵向传递是通过上、下层纤维间的接触完成的;打孔和压花处理能增加纤网中纤维间的孔隙和改变纤维的排列方向,进而加快平纹热风非织造材料面层的穿透速度,提高液态水的纵向传递能力,使平纹热风非织造材料面层的蓬松度分别提高11.64%和21.31%,回渗量分别增加3.13%和7.0%,此外压花对热风非织造材料面层柔软性影响最大,使柔软度降低了9.81%。

Effect of aperture and embossing treatment on the properties of hot-air nonwoven topsheets

To provide a better basis for the selection of diaper topsheets,firstly,microstructures of flat hot air-through nonwoven topsheet are analyzed.Then the mechanical,rewet&strike through and liquid water transfer properties of flat,aperture and embossing hot-air nonwoven topsheets are tested and characterized.The results show that the fibers in flat hot-air through nonwoven topsheet are laid in horizontal state with point bondings existed among the fibers.Longitudinal transmission of liquid water in web is completed by the contact between upper and lower fiber layers.Aperture and embossing treatment could increase the pores between the fibers in the web and change the arrangement direction of the fibers.Besides,it could also accelerate the penetration speed of the surface layer of flat topsheet and improve the liquid water transfer performances.On the other hand,the bulkiness of flat topsheet increases by 11.64%and 21.31%and rewet is heightened by 3.13%and 7.0%,respectively.In addition,embossing has the greatest effect on the softness of hot air nonwoven topsheets,and the softness is reduced by 9.81%.