7.3 Mechanism of Thermosetting Heat setting stresses in the amorphous regions of thermoplastic fibers. When the fiber is heated above its glass transition temperature, the molecules in the amorphous regions can move, and the material can be formed into a new shapes Thus, crease that have developed in the fabric can be pulled out. and the width of the fabric can be changed somewhat in the heat setting proces
7.3 Mechanism of Thermosetting • Heat setting stresses in the amorphous regions of thermoplastic fibers. When the fiber is heated above its glass transition temperature, the molecules in the amorphous regions can move, and the material can be formed into a new shapes. Thus, crease that have developed in the fabric can be pulled out, and the width of the fabric can be changed somewhat in the heat setting process
B 图7-6表示定型定义的负 荷一形变团示
7.3 Mechanism of Thermosetting 7.3. 1 Basic principle and basic course Basic principle 利用加热使纤维大分子链段的活动 性增加,纤维网结构中弱的结合点被拆 散,结构舒解,内应力被释放;在外力 变形下冷却,重建新的结合力,使织物 的形态得到稳定
7.3 Mechanism of Thermosetting 7.3.1 Basic principle and basic course Basic principle: 利用加热使纤维大分子链段的活动 性增加，纤维网结构中弱的结合点被拆 散，结构舒解，内应力被释放；在外力 变形下冷却，重建新的结合力，使织物 的形态得到稳定
Basic course 1.纺织材料在加热下柔性化 2.柔性材料在外力下变形; 3.变形下冷却使新的材料得到稳定 刚性体 加热 柔性体 外力 柔性体 冷却 刚性体
• Basic course • 1. 纺织材料在加热下柔性化； • 2. 柔性材料在外力下变形； • 3. 变形下冷却使新的材料得到稳定。 刚性体 加热 柔性体 外力 柔性体 冷却 刚性体