Calculating Weft Tension Wave Propagation and Loom Stop Failure Rates
Calculating weft tension wave velocity and boundary reflections predicts peak dynamic stress spikes, allowing precise brake tuning to minimize loom stop failure rates.
Relay Nozzle Pressure Profile
Pneumatic Trajectory
Air-jet weaving machines rely on sequential air jets firing along the reed channel to carry filling yarn across the warp shed. A relay nozzle pressure profile defines the pressure levels and firing durations across all auxiliary air nozzles on the loom. Chinese linen mills adjusting air-jet looms for coarse or fine flax spun yarns log these pressure values on machine setup sheets to maintain consistent insertion speeds.
Mill inspection reports include these pneumatic settings when auditing compressed air consumption and yarn insertion stability.
Weft Insertion
Flax yarns display irregular hairiness and high stiffness compared to smooth synthetic continuous filament yarns. These physical characteristics increase pneumatic drag along the yarn body, requiring staggered air pressure settings across the loom width to maintain filling thread velocity. Auxiliary nozzles near the insertion side operate at higher pressure to accelerate the yarn tip, while downstream nozzles utilize lower blowing pressure to sustain momentum without untwisting the staple yarn.
Incorrect pneumatic profile configurations cause tip folding or trailing picks, reducing weaving room efficiency and fabric output quality.
Yarn Degradation
Excessive blast pressure from auxiliary relay nozzles causes fiber displacement and surface damage on delicate wet-spun flax yarns. Localized air turbulence strips short fibers from the yarn core, creating fly waste in the reed space and reducing thread tensile strength.