The tensioner can be divided into three-post type and oil hydraulic type. The main properties are: .When take out yarn, it can adjust different tension in ring bobbin. .It can hold more than 250m/min of taking out speed. The tension is constant .Identify the tension yarn at any time and avoid broken yarn effectively. .Fine the broken yarn at ring bobbin directly. .Being no open and rotating parts, the machine is not sensitive to dust and not easy to take trouble