Research On Process Of Three-dimensional Tubular Woven Farbic

Tubular structure as a foundational structure type, is widely used in engineering, and is inhuge demand. Recently,the composite materials with tubular fabric as its skeleton have manyadvantages,such as lightweight, high specific stiffness and strength, excellent fatigue resistance,corrosion resistance,etc. Nowadays,with the development of high-strength lightweight compositematerials demand, the weaving technology about three-dimensional(3D)woven tubular fabrics hasbecome an important research direction.The weaving technology about three-dimensional woven fabric has developed rapidly.Currently, there are many shaped methods and three-dimensional weaving looms existing indomestic and abroad, but, most of these shaped methods and3D weaving looms are in manual orsemi-automatic, and the quality of the obtained3D woven fabrics is difficult to guarantee, the kindof3D woven fabrics is limited. To achieve the mechanized production of3D woven fabric, weshould research and develop the new3D loom with high efficiency and automation.This paper focused on a new shaping-method to creat three-dimensional (3D) woven tubularfabrics, this new shaping-method called circular orbit weaving method. In this method, warpdirection is arranged along the circumference of circle orbit, and warp can be circumferentialmovement along the circular orbit. Weft yarns are inserted in the direction of woven radially.Using circumferential opening,radial shedding, due to the radial shedding is open,it can realizeweft insertion continuous and weaving process automation. Based on circular orbit formingprinciple,by means of fabric structure analysis and discussing the basic parameters, it can beconcluded: different fabric structures have different forms of weft insertion, and the warp numberin addition to meeting the structure design, and still need to meet the form of weft insertion.Orthogonal organization warp adopts an even warps; Three layers of multi-layer structure using anodd number of warp, and warp in the adjacent obit also should be an even number in order to getstable fabric.This paper first through used the circle orbit weaving method to successfully design the3Dtubular machine. At the same time, a sample machine was successfully developed, it mainly includes shedding mechanism, yarn storage let-off mechanism, continuous pick motion, lappingdevice and so on. After the fabric organizational structure and the basic structure’s parametersanalyzed(including the tubular fabric’s thickness, the forms of weft insertion and the number ofhanging warp.etc). Then this paper through used polyester strands to finish the weaving oforthogonal structure and triaxial multi-layer structure.After the above two fabrics got-off the machine, theirs structures were fixed also withCollodion. Through tested the related parameters such as warp, weft and lapping density, thicknessand so on, collected the fabric surface images and observed the surface morphology of the warpyarns in the fabrics; and then section the fabric’s weft direction, collected section images andcombined with image processing technology to observe actual fabric structure yarn form andsection shape, the results indicated that as follows:（1）End spacing of forming fabric related to many factors,such as fabric structure, warpnumber in orbit and the diameter of the winding down frame,etc.（2）For orthogonal fabric,the warp yarn surface state which extend along the verticaldirection of the fabric, as for triaxial multi-layer structure, the warp is inclined,showing obliquecrossing.（3）Two fabric’s section images are more consistent with the designed cross-sectional, itverified the feasibility of circular orbit shaping method; but because of the actual operation,suchas the shortage of the weft insertion force and beating-up force factors,caused images still existsome gaps; Compared with orthogonal woven fabric, triaxial multi-layer fabric has moreinterweave,warp were little piled, interwoven amplitude.In summary, the results showed that the circular orbit weaving method was correct, thedesign of the tubular fabric’s structure was reasonable, each constituted technical parameter wasfeasible,and the design and manufacture of3D tubular weaving machine was successful. All thesemeans that if using high performance textile fibers, the correlative design and manufacture methodcan be carried on in the future.