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What is the effect of the order of heald frames on the dynamic tension of warp yarns?
2025-04-16
The influence of the front and back arrangement order of the heald frames on the dynamic tension of the warp yarn is mainly reflected in the uniformity of tension distribution, the stability of tension and the adaptability to the process. A reasonable arrangement order can optimize weaving efficiency and fabric quality, otherwise it will increase the breakage rate and process fluctuations.
1. Uniformity of tension distribution
The arrangement order of the heald frames determines the force path of the warp yarn in the opening and closing movement. If the front and back positions of the heald frames are not arranged properly, the difference in the degree of stretching of the warp yarns at different levels during the movement will increase, resulting in uneven tension distribution. For example, the warp yarns of the front heald frames are prone to higher static tension due to the larger opening stroke, while the warp yarns of the rear heald frames may cause a sharp increase in local tension due to the superposition of friction resistance. This imbalance can cause problems such as warp yarn breakage or uneven fabric surface.
2. Dynamic stability of tension
The arrangement order of the heald frames directly affects the fluctuation amplitude of the warp yarn tension. Reasonable order design can reduce the frequency of friction between the warp yarn and the healds and adjacent yarns, thereby reducing the peak value of dynamic tension. For example, arranging the heald frames with similar motion patterns in groups can avoid mutual interference between heald frames with different motion rhythms, making the tension curve smoother. On the contrary, if the heald frames are arranged in a staggered order, the warp yarns are prone to sudden changes in tension during frequent interlaced movements, which aggravates equipment vibration and energy consumption.
Three, synergy with process parameters
Different fabric structures and loom speeds have different requirements for warp tension. Plain fabrics usually require evenly distributed heald frames, while jacquard fabrics may use a jumping arrangement to balance the tension of complex structures. For example, the "front dense and back sparse" arrangement strategy is adopted during high-speed weaving to reduce the additional tension caused by inertia of the warp yarns in the back heald frames. This process adaptability requires designers to comprehensively consider yarn characteristics, fabric density and equipment parameters for dynamic optimization.
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