This paper investigates the control system of trade - mark moulding - machine . results indicate that the tensile force autocontrol equipment should be added . unfold dynamic process of web is modeled and analyzed and a kind of tensile force autocontrol system is researched 分析了商标模切机的控制系统,由此得出应该增加张力自动控制系统装置,并一为此对卷筒纸打开过程进行了动力学建模分析,提出了张力自动控制系统的方案设计。