Pressure, Timing & Tension

Warp-tension zeroing establishes the sensor reference, but the exact procedure differs by loom and controller. The warp must be in the specified condition before zeroing, and the result should be checked on the display. Also confirm air supply, filters, leakage, feeder condition, reed cleanliness and the approved recipe before changing process values.

Main-nozzle and relay-nozzle pressure and timing should support a continuous yarn flight through the open shed. If arrival is late, first locate the loss of control before adding air. If arrival is early or unstable, review release, braking, main-nozzle duration and relay overlap rather than reducing one value blindly.

• Observe weft arrival and stop position
• Check supply pressure under running load
• Verify nozzle sequence and leakage
• Confirm that the shed is clear during the full flight

Warp tension must be high enough for stable shedding but not so high that warp breaks increase. Weft withdrawal tension should control the package without restricting acceleration. Pick density is governed through take-up in coordination with the loom cycle; changes must be confirmed on the woven fabric rather than accepted from the display alone.

Use a reference fabric and record the initial recipe, alarm pattern, arrival trend and cloth condition. Make one limited change, run long enough to observe the result, and keep or reverse it based on evidence. This prevents several simultaneous adjustments from hiding the actual cause.