To adjust the tension of the double needle bar warp knitting machine, it is necessary to accurately control the yarn type, fabric structure, equipment adjustment, and real-time monitoring to ensure uniform and stable tension and avoid fabric defects.
Set according to yarn characteristics
The tension of chemical fiber filament (such as polyester and nylon) is usually 10- 30cN. The fine denier yarn is selected with a low value and the coarse denier yarn is selected with a high value; the tension of short fiber yarn (such as cotton yarn) is set to 5-15cN to avoid yarn breakage due to insufficient strength; elastic yarns such as spandex are pre-stretched and put on the machine with a low tension of 3-8cN to prevent excessive loss of elasticity.
Adjust according to fabric structure
The front combing tension of dense fabrics (such as double-sided fabrics) is 2-5cN higher than the back combing tension to tighten the surface coils; the tension difference of each comb bar of mesh fabric is controlled within 3cN to prevent mesh deformation; plush fabrics need to reduce the tension appropriately to avoid excessive tension of the plush yarn affecting the fluffiness.
Fine adjustment on the equipment side
The damping tensioner is adjusted by adding or removing washers (single washer is about 5cN), and the electronic tensioner sets the target value to achieve automatic closed-loop control; ensure that the yarn guide path is smooth and wear-free, adjust the yarn guide rod angle to 45°-60°, and avoid sudden changes in tension; when the needle bed spacing is large, the back combing tension needs to be increased by 3-5cN to compensate for the yarn droop.
Real-time monitoring and dynamic correction
Install an online tension sensor, and the tension fluctuation exceeds ±5cN to automatically alarm and stop; randomly check the tension of 5-10 yarns every hour, and recalibrate when the error is greater than ±8%; observe the surface of the fabric, and if there are problems such as coil thinning, curling, and sparse needles, adjust the tension by 3-10cN in time; when changing the yarn specifications, first set the tension according to the principle, and then optimize the parameters by trial weaving 5-10 meters of fabric samples to ensure that the tension matches the production needs.
If you have any questions about the double needle bar warp knitting machine, please contact New Power. Our professional team will provide you with customized solutions and comprehensive technical support.
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