Tension Strain
Extreme spike values of mechanical pull exerted on warp yarns during shed opening and the subsequent beat-up stroke represent the most demanding phase of the loom cycle. These momentary forces, known as warp line tension peaks, must be carefully managed to prevent warp yarn failure on the loom. High-speed looms use spring-loaded backrests to absorb these shocks, distributing the load across the entire warp sheet.
Technicians monitor these values during trial runs, saving the tension graphs to the weaving control system.
Loom Setting
Adjustment of the loom’s mechanical settings aims to minimize the intensity of these force spikes without compromising shed clarity. To control warp line tension peaks, the weaving manager optimizes the backrest position and shed timing, registering these mechanical configurations on the loom setup card. If the peaks exceed the elastic limit of the linen yarn, individual warp yarns will break, which forces the loom to stop and requires manual knotting by the operator.
Keeping these peaks below the critical threshold ensures continuous, trouble-free running of the loom. Regular lubrication of the mechanical let-off system prevents the sticks and slips that can elevate these peaks to destructive levels.
Fabric Performance
Cloth quality depends on maintaining a uniform tension across the entire width of the loom beam during operation. Uncontrolled warp line tension peaks leave permanent structural memories in the fabric, resulting in uneven weft density or micro-tears that the buyer’s quality inspector will reject. By setting the electronic warp let-off system to react dynamically, the mill ensures that yarn is delivered at a rate that dampens these sudden spikes.
