Resolving Edge Tension Drift and Temple Mark Variations on Wide Air-Jet Linen Weaving Warps
Wide air-jet linen weaving requires synchronized relay nozzle pressures and precise temple pin geometry to stop edge tension drift and edge damage.
Catch-Cord
Temporary Binding
Auxiliary selvedge yarns maintain mechanical grip on the leading tip of an inserted filling thread during air-jet weaving. In high-speed weaving of pure or blended linen, a catch-cord provides temporary anchorage outside the woven selvedge so that pick tension remains stable until the right-hand cutter operates. Mills running flax yarns rely on this temporary thread structure to prevent spring-back and frayed selvedge edges across wide looms.
The mechanism releases or gets sheared away immediately after beat-up, ensuring that the waste strip collects cleanly in the waste extraction tube without dragging loose fibers back into the fell.
Tension Maintenance
Pneumatic propulsion forces the filling yarn through the air channel toward the right-hand selvedge. The catch-cord catches the tip of the flax yarn, holding it taut while the main reed closes against the cloth fell. Without correct tension at this boundary, stiff linen fibers whip back into the shed and generate defects.
Precise yarn friction along this temporary cord balances the lateral pull of the main nozzle.
Edge Clearance
Waste edges trimmed from the cloth roll pass into pneumatic suction channels for collection. If the catch-cord snaps during insertion, the loom sensor triggers an immediate stop before a false pick embeds in the weave. Quality reports in Chinese weaving facilities document catch-cord failure rates alongside warp breakage statistics.
Proper selection of synthetic filament strength for the catch-cord prevents premature snapping under high reed speeds.