Shedding Strain
Mechanical strain induced in warp ends during the upward and downward displacement of heddle frames defines the peak tension experienced by yarn segments forming the weaving shed. Managing shed opening stress prevents yarn fatigue and abrasion in stiff, low-extensibility flax warps during high-speed loom operation. The geometry of the shed clearance, backrest roller height and dwell angle directly determine the magnitude of force exerted on individual ends.
Because linen yarn exhibits low elasticity, sharp shed geometry generates elevated tension forces that approach the breaking threshold of spun flax. This stress parameter applies specifically to the active weaving zone between the drop wires and the cloth fell.
Heddle Movement
Heddle movement separates warp ends into upper and lower sheets to create a clear passage for weft insertion mechanisms. As the shed opens to maximum height, yarn path length increases, pulling additional warp material against the tension let-off system. High shedding speed magnifies dynamic peak forces, concentrating frictional wear inside heddle eyes and reed dents.
Adjusting backrest roller position and reducing shed height minimizes peak tension pulses without compromising weft clearance.
Breakage Control
Excessive shedding tension leads to frequent warp breakage and reduced loom efficiency. Balancing shed geometry protects brittle flax yarns while maintaining clean weft insertion.
