Peak Force
Mechanical force profiles quantify the transient peak resistance encountered when the loom reed compresses the newly placed weft insertion into the cloth fell. In Chinese linen mills processing dry-spun or wet-spun flax, beat up tension represents the instantaneous tensile spike experienced by warp yarns at front dead center. Flax possesses high tensile strength but modest elongation, which causes these momentary surges to concentrate severe mechanical strain along the selvedge areas.
Tension monitors record these spikes through piezoelectric sensors installed on the oscillating backrest, documenting peak loads on the mill shift log. Mill guidelines define strict operating thresholds to prevent yarn rupture before cloth inspection.
Loom Dynamics
Oscillating sley assemblies drive the reed forward against heavy cloth resistance during fabric formation. During heavy linen cloth manufacturing, beat up tension varies cyclically with crank angle and shedding timing. Asymmetric shedding geometry separates the upper and lower yarn sheets, shifting beat up tension onto the tighter yarn layer during reed impact.
Technicians adjust backrest height and let-off compensation linkages to equalize warp stress across both sheds. Mill setup sheets record the crank angle of beat-up alongside tension values measured in centinewtons per warp end. Improper mechanical timing leads to reed marks and broken picks across the loom width.
Loom speed governs how rapidly this force builds during reed acceleration. High-speed rapier machines amplify peak impact, requiring precise electronic let-off coordination to avoid premature warp end snapping.
Structural Displacement
Cloth fell displacement determines whether the newly inserted yarn locks securely into the textile structure. Higher beat up tension drives the inserted pick past yarn friction barriers to achieve target cover factors in dense apparel linens. Mill technicians verify pick density under standard GB/T 4668, adjusting beat up tension through backrest deadweight settings or servomotor let-off profiles.
Excessive beat up tension creates permanent structural deformation in brittle flax yarns when mechanical strain limits are surpassed.
