Study On Structure And Performance Of Tricot Warp Knitting Pile Fabric For Car Proof Interior

With the development of the textile technology and overall setting process adopted, textilesare widely used and performance requirements are improved in automobile interior trim. Atpresent, Fabrics and sponge composite materials, which have some disadvantages such as theflame composite technology used can pollute the air and sponge can absorb the air toxicsubstances, are widely used in car roof interiors. Therefore, the warp knitting piles/nonwovenscomposite upholstery fabrics are designed to replace the sponge composite products. The tensilemechanical anisotropy, the formability and functionality of the warp knitting pile/nonwovenscomposite and sponge composite materials are tested, researched and compared with the purposeof gaining a new warp knitting pile composites car roof interiors which have a certainappearance, good formability and good heat insulation and sound insulation properties.In this paper, To design warp knitting piles/nonwovens composite fabrics，multi-factors areconsidered such as raw material、warp knitting structure, weaving and raising process, compositetechnology. The new products produced by Tricot technology and the concrete propertiesresearch work are as followed:Firstly, properties of raw materials are tested and three-bar tricot stitch is designed, weavingprocess and raising process parameters are researched. Choosing the proper nonwoven fabricsand environmental protection composite technology, the structure and properties of new productscan meet car proof interiors. Five sponge composite materials are prepared.Secondly，research on tensile mechanical anisotropy of fabrics: including the tensile failureforms and mechanical property change trend of warp knitting pile fabrics, non-woven fabrics andcomposite fabrics in0\30\45\60\90degrees; comparing and analyzing the difference ofmechanical properties of composite fabrics,before and after.Thirdly, the formability judgment and comparison of warp knitting pile and spongecomposite fabrics: test and analysis two-dimensional static and dynamic elongation rate, build a three-dimensional top stretching deformation geometric model to test top stretching deformationrate, synthesize two and three dimensional elongation rate to evaluate the formability.Fourthly, test the heat insulation and sound insulation properties of warp knitting pile andsponge composite fabrics. Analyze the influence of villous height and composite nonwovens andcomposite sponge to material’s thermal conductivity and sound insulation. Comparing andevaluating heat insulation sound insulation of warp knitting pile and sponge composite fabrics.After a series of properties test, analysis and research, results show that: warp-knitting pilefabrics, which have argyle effect on the front side and have different villous height on reverseside, are obtained by tricot structure design and then composite nonwovens. Warp-knitting pilefabrics have obviously tensile mechanical anisotropy because of under-lap break and compositenonwovens can improve its tensile mechanical anisotropy. The strong values of the pilecomposite fabrics are improved and breaking elongation controlled within the50~110%aftercompositing. Sponge can lower the tensile properties of sponge composite fabrics becausesponge has low strong value. All composite fabrics static elongation rate over14%under50Nforce，dynamic elongation rate over30%and top stretching deformation rate pile over4%under100N force, which means that all composite fabrics have good formability and are suitable fordifferent car roof surface, but sponge composite fabrics have better deformation rate than pilecomposite fabrics. Composite nonwovens can lower thermal conductivity. Pile and spongecomposite fabrics between0.05and0.06W/(m2K), which show that heat insulation effect ofpile composite fabrics are similar to sponge composite fabrics. Sound insulation quantity of pilecomposite fabrics can reach13dB at1600Hz and is obviously higher than sponge compositefabrics, this result show that pile composite fabrics have good sound insulation effect.This topic research does some useful research and practical exploration in pushing theautomobile interior trim into environmental protection, fictionalization high-quality development.New products can be used directly in practice which has realistic significance.