Insertion Failure
Loss of grip on the filling yarn during the insertion phase of the weaving cycle causes structural defects and machine interruptions in modern high-speed looms. In linen weaving mills, rapier clamp slippage occurs when the coarse or irregular nature of flax yarn prevents the gripper from holding the thread securely. This results in an incomplete pick where the yarn is either released too early or not carried across the shed at all.
Because flax yarn has a variable diameter with thick and thin places, the clamp must be precisely calibrated to grip different thicknesses without crushing the fibers.
Mechanical Inspection
Technicians detect this fault by monitoring the frequency of weft-way loom stops and examining the gripper pads for wear or lint accumulation. This evaluation requires measuring the spring tension of the rapier clamp using a specialized gauge. If the gripping force is too low, the yarn slips out during the peak acceleration of the rapier head.
The mill’s maintenance log records these tension checks on a weekly basis to ensure consistent performance during long weaving runs. Accumulated linen dust is also removed to prevent it from clogging the clamp mechanism.
Defect Mitigation
Maintaining correct gripper tension ensures that the woven linen fabric remains free of broken picks and thick-and-thin defects. This control allows the mill to meet the buyer’s criteria for first-grade export cloth. The inspection sheet confirms the absence of weft-way faults before shipment.
