Knitting Technique And Performance Research Of Weft-Knitted Spacer Fabric

Knitting spacer fabric can be divided into weft-knitted and warp-knitted. Now warp-knitted spacer fabric is mainly developed in clothing, decoration, and industrial area. Considering environmental protection and performance of warp-knitted spacer fabric, people now try to make use of spacer fabric replace sponge. Compared with warp-knitted spacer fabric, circular weft-knitted spacer fabric has good elastic regardless of weft and warp, it can enrich the structure and form jacquard pattern through selecting needle, has high productivity and product type can be changed quickly. Recently, circular weft-knitted spacer fabric got development quickly and the products have been applied in underwear, surface material of cushion, functional sportswear and leisure clothing and so on. Now there are few research and manufacturing about circular weft-knitted spacer fabric in our country.In this paper, weft-knitted spacer fabric is produced on a circular knitting machine with 16 inch diameter and 22 gauge using polyester as spacer fiber and low elastic polyester yarn as surface fiber. After analyzing the structural features of fabric, the author explored knitting technology and parameter, investigated the effect of sinking depth, yarn feeding speed, take-up tension and distance between cylinder and dial on fabric quality, and are presented some methods.In finishing process, appropriate washing temperature and heat set temperature are confirmed. Industrial finishing process is presented in detail referring to documents.8 types of spacer fabrics are knitted through changing distance between dial and cylinder to make the fabric thick changed and changing speed of yarn feeding to make the fabric density changed. The effect factors of basic fabric performance such as cockle elasticity, air permeability are discussed in detail comparing with basic parameters of fabric including fineness of spacer yarn, fabric density and thickness and the distance.The feature and reason of bursting curve and split appearance are analyzed in detail. The reason for difference of bursting strength is also discussed in the paper.On base of air permeability experiment, the author made use of multi-linear regression to analyze effect factors and got the regression equation.The research on compression performance of weft-knitted spacer fabric is one of the most important work. The reason of difference compression performance about 8 types of fabric are discussed in detail. On base of experiment, the author made use of single unlinear regression to analyze the relation between compress and thickness. In addition through imitating people action in daily life, the author did cyclic compression experiment repeatly and checked the compression performance of the fabric.The research results of this paper have practical significance in promoting the application and manufacture of the weft-knitted spacer fabric.