Warp Damage
Mechanical degradation of flax yarn occurs when the loom reed repeatedly strikes the fibre surface during the shed cycle, creating wear patterns that reduce structural integrity in the finished textile. Reed abrasion manifests as localized surface fuzz or snapped filaments along the warp direction, directly influencing the tensile strength of the cloth before it leaves the loom. Each strike cycles the wire dents against the taut warp threads, especially under high tension requirements necessary for dense linen counts.
Engineers track this degradation through yarn thinning metrics recorded in the mill production log. Frequent observation confirms that higher density counts demand tighter tolerances between the wire dent and the fibre surface to prevent breakage during shuttle passage. Wear limits dictate when a reed requires professional grinding or total replacement to maintain the desired finish quality for export batches.
Inspection Protocol
Assessment of this damage happens at the loom station before the piece reaches the finishing house for calendering or bleaching. Quality control technicians pull sample segments from the start, middle, and end of the bolt to verify consistency against the target grade established in the buyer contract. A fibre grade focuses on the raw flax cleanliness and length, whereas a fabric grade measures the physical state of the woven structure.
Buyers mandate specific friction coefficients during the warp preparation phase to prevent the reed from slicing into dry, unprotected yarn. Mills apply sizing compounds to coat the flax, creating a protective barrier that resists contact fatigue from the metallic reed dents. Documented test results include the number of snapped ends per square meter and the frequency of loose fibres protruding from the surface.
Maintenance Requirement
Proper setting of the backrest height and the shed timing minimizes the horizontal travel distance of the reed, lowering the force applied to the yarn at the moment of impact. Operators monitor the vertical alignment of the reed dent profile to ensure even distribution of the strike across the warp. A worn reed creates irregular striping that survives the finishing process and leads to the rejection of the entire lot during final warehouse appraisal.
