A pressure-bar is put on the back drafting zone so as to remove the back-surrounded arc and to make more uniform drafting.It also gives a good method to reduce the hairness.

• 通过在后牵伸区增加一附加压力棒消除反包围弧,从而提高牵伸效果,并对其产生的毛羽增多的弊病采取了建议性措施。