Optimizing Relay Nozzle Dynamics for High Hairiness Bast Fiber Shedding in Air Jet Looms
Optimizing relay nozzle pressure vectors, timing overlap, and reed profile clearance eliminates hairiness-induced stops in high-speed bast air-jet weaving.
Kinetic Jet Velocity
Insertion Energy
Pneumatic fluid forces drive weft yarns through the open shed by transferring kinetic energy from compressed air streams to the fibre surface. High-speed air-jet looms measuring kinetic jet velocity calculate the energy carried by compressed air blasts exiting main and relay nozzles during weft insertion. Mill technicians monitor air pressure meters and high-speed sensor logs to maintain yarn acceleration without inducing structural defects.
Test sheets record velocity profiles across the entire reed length for every loom setup.
Nozzle Propulsion
Main nozzle acceleration determines the initial movement of stiff flax weft yarn into the shed opening. Because linen yarn exhibits high bending stiffness and uneven linear density, air streams must supply sufficient impulse to overcome friction against warp sheet yarns. Relay nozzles positioned along the reed profile fire in synchronized sequences to maintain momentum across wide fabric widths.
Excessive kinetic energy splits coarse flax bundles or creates untwisted yarn sections, whereas low propulsion forces cause short picks and trailing loops.
Trajectory Profile
Quality control protocols evaluate jet output parameters during style changes on the production floor. Electronic air flow sensors measure output pressure curves to verify that pneumatic propulsion remains within target ranges specified in setup tickets. Mill technicians adjust valve duration when processing spun flax lots of varying metric count.
Proper air stream calibration reduces filling stop frequencies and prevents yarn breakage during high-speed production.