Cotton Polyester Blended Yarn Mechanics in High Density Workwear Weaving
65/35 poly-cotton workwear performance relies on ring twist multipliers near 4.4 and early shed timing to maximize warp cover factor without pilling failure.
Harness Crossing
Shed Alignment
Point in the weaving cycle where the rising and falling frames pass each other to change the warp shed for the next pick insertion. Synchronizing this movement is essential for clear shed formation and efficient shuttle or projectile passage. Proper harness crossing timing prevents yarn abrasion and reduces the frequency of loom stops.
It is a critical setting in the loom timing diagram.
Timing Settings
Technicians adjust the crank angle of the loom to determine when the frames align at the same level. An early harness crossing increases the tension on the warp ends before the reed beats up the filling. Late timing allows for a wider window for the weft insertion but can result in loose picks.
Fabric Quality
Mismatched settings lead to defects like skipped stitches or broken filaments in delicate filament yarns. High-speed air jet looms require precise harness crossing to ensure the shed is fully open for the burst of air. Different weave structures like satin or twill necessitate specific timing adjustments to manage the complex shedding patterns.
Mechanical Alignment
Regular maintenance of the cam or dobby drive ensures that the motion remains consistent across the entire width of the machine.