针对卷筒纸印刷生产的特点，阐述了张力控制的目的和影响张力的主要因素，分析和研究了纸带张力控制机理。
The purpose of tension control and main factors influence tension were explained according to the characteristic of web press.
说明了张力控制系统中采用的PID控制规律的优点，并得出纸带张力控制系统的影响因素和控制中需要解决的相应问题。
The advantages of PID control in tension control system were explained. The influencing factors and problems needed to be solved in tape tension control system were put forward.
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