Contact Friction
Friction resistance generated at the sliding interface between a loom harness wire and running warp yarn defines the tribological interaction in shedding machinery. High surface roughness on flax yarn increases resistance, making the heald eye friction coefficient a vital factor in determining yarn abrasion during loom operation. The value quantifies the dimensionless ratio of frictional force to normal force as warp ends travel through the eyelet during shedding movements.
Measurement applies strictly to the contact zone within the harness wire and excludes general yarn-to-yarn friction along the warp sheet.
Abrasion Damage
Surface degradation of flax fibres accelerates when contact resistance generates heat and mechanical shear at the harness interface. Repeated rubbing strips short flax fibres from the core structure, forming lint buildup inside the loom shed. Fabric inspection logs record slubs and lint balls created by accumulated fibre debris.
Mill quality standards mandate surface polishing or ceramic coatings for heald eyes to maintain low friction during high-density fabric production.
Component Specification
Selection of nickel-plated steel or specialized ceramic inserts establishes the baseline coefficient for grey cloth production. Lab testing protocols record surface roughness values alongside buyer acceptance limits for yarn hairiness growth. Maintaining low contact resistance prevents warp breakage across long production runs.
