Research On The Splitting Process Of COPET/PA6Sea-island Ultrafine Fiber Synthetic Leather Base Fabric

Through year’s continuous researches and developments, synthetic leather has got flyingincrease on product qualities, varieties and yield. The expectation of people on the synthetic leatherhas become higher and higher, they expect it’s performance could get closer to vegetable leather,even surpass the vegetable leather. The producing process of Sea-Island ultrafine fiber syntheticleather stretches over four industry fields and the related professional technologies, which are theproducing process of Sea-Island ultrafine fiber, the producing process of Sea-Island ultrafine fibernonwoven fabric, the producing technology of Sea-Island ultrafine fiber synthetic leather and thedyeing-finishing technology of Sea-Island ultrafine fiber synthetic leather. These technologiesopens up a way for Sea-Island ultrafine fiber synthetic leather.This article used the stereo microscope, SEM, electronic fabric tensile tester to characterizeand analysis their structure, mechanical, permeability. Mainly the Sea-Island ultrafine fiber PUsynthetic leather’s splitting process is systematic studied, the physical properties of the base fabricis studied, the relationship between the splitting process and the structure&properties of the basefabric is studied, and then the reasons of these changes are also researched. The test results showthat the diameter of the nascent fiber is about21.67μm, the split single fiber’s diameter is about3.5μm, the split fiber bundle’s diameter is between22to30μm. The gum dipped base fabriclongitudinal and transverse tensile strength increased about twice and2.5times over the nonwovenfabric which is significantly; Gum dipped base fabric longitudinal and transverse tearing strengthreduced.Weightlessness rate, warp/weft tearing strength and fabric compression resilience wasdefined as dependent variable, solubility in processing time, alkali solution and processingtemperature was defined as independent variables. The results show that, alkali liquor is the mainfactor that affects the ability and detaching ratio of Sea-Island ultra1fine fiber leather. The tearingstrength increased and the compression elasticity decreased with increasing of the splitting rate.Further analysis by means of SEM and Compression Curve, it was demonstrated that the changes of frictions and cohesive force among single ultrafine fibers inside fiber bundle were the mainreason for the conclusions after fully split. The performance and style of Sea-Island ultra1fine fiberleather were better under the technical parameters of30g/L,85℃,10min.According to the former people’s compression curve block theory, the macroscopic stresscurve’seachstagewasfound,andthevariationsofthestrainandcompressionratiowerecalculated.Then the changes were related with the weight loss rate to see their connections, and the seasonsfor these connections were studied from the microscopic structure and macroscopic stress straincurve, which mainly because of variety of split ratio outside and inside the Sea-Island ultrafinefiber synthetic leather base fabric, the inner Sea-Island ultra-fine fiber filling in the micro holeinside this leather and the easy deformation of the PA6ultra-fine fiber bundle.