Study on preparation process of 3-D sandwich structures of warp knitting reinforced materials

The study on 3-D glass fiber sandwich structures of warp knitting fabric was based on the traditional sandwich warp knitting,including selection of raw material,fabric structure design,and trial weaving on machine etc.The results showed that optimized design of warp knitting fabric structure,selection of glass fiber yarn with less linear density and twist factor,and proper lubrication during weaving can greatly reduce end breaking due to glass fiber′s brittleness,electrostatic generation and hair hooking tendency.At the same time,choosing proper knitting elements configuration good for loop formation,optimization of the knitting shape,adjusting the yarn tension according to yarn tension fluctuation peak,and choosing larger force angle can better improve the weaving performance of glass fiber and the shaping quality of 3-D sandwich structures of warp knitting.This study offers some reference for practical production.