广东费飘职业故本学院 Guangdong Inatitute of Textile Technology Properties a For silk producers, i.e. silk worm spider etc, silk fibers are for protection transport and food capture 日 Mechanical properties Medium tena city but higher than wool d resulted from molecular structure ■ Zigzagβ- sheet of silk ys ahel× of wool higher crystallinity than woolProperties  For silk producers, i.e. silk worm, spider etc., silk fibers are for protection, transport and food capture  Mechanical properties ◼ Medium tenacity but higher than wool  resulted from molecular structure: ◼ zigzag b-sheet of silk vs a-helix of wool ◼ higher crystallinity than wool