tailieunhanh - Advances in Modern Woven Fabrics Technology Part 6

Tham khảo tài liệu 'advances in modern woven fabrics technology part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Multiaxis Three Dimensional 3D Woven Fabric 89 creel supplies bias warp yarns in a sheet to the special heddles connected to the jacquard head. The bias yarns then pass through the split-reed system which includes an open upper reed and an open lower reed together with guides positioned in the reed dents. The lower reed is fixed while the upper reed can be moved in the weft direction. Fig. 14. Four layers multiaxis woven fabric a and Jacquard weaving loom b Mood 1996 . The jacquard head is used for the positioning of selected bias yarns in the dents of the upper reed so that they can be shifted transverse to the normal warp direction. The correct positioning of the bias yarns requires a series of such lifts and transverse displacements and no entanglement of the warp. A shed is formed by the warp binding yarn via a needle bar system and the weft is inserted at the weft insertion station with beat-up performed by another open reed. Another multiaxis four layer fabric was developed based on multilayer narrow weaving principle Bryn et al. 2004 . The fabric which has bias warp and filling yarn sets is shown in Figure 15. The fabric was produced in various cross-sections like - - -fl- . Two sets of bias yarns were used during weaving and when bias yarns were reached the selvedge of the fabric then transverse to the opposite side of the fabric and become -bias. All yarns were interlaced based on traditional plain weave. A narrow weaving loom was modified to produce the four layers multiaxis fabric. The basic modified part is bias insertion assembly. Bias yarn set was inserted by individual hook. The basic limitation is the continuous manufacturing of the fabric. It is restricted by the bias yarn length. Such structure may be utilized as connector to the structural elements of aircraft components. Fig. 15. Four layers multiaxis woven fabric a and narrow weaving loom b Bryn et al. 2004 . 90 Advances in Modern Woven Fabrics Technology A multiaxis weaving loom was developed