Component Standard
Geometrical parameters of the guide openings in loom harnesses determine the clearance available for yarn passage during shed formation. In linen weaving, heald eye dimensions dictate how much mechanical friction a flax warp yarn experiences as the harness frames move up and down. These specific structural measurements are selected based on the yarn count and the frequency of natural yarn slubs.
Mechanical Wear
Contact between the yarn surface and the steel edge of the harness opening causes abrasive damage during high speed operations. When incorrect heald eye dimensions are utilized, flax fibres scrape against the metallic boundaries, shedding lint and initiating microscopic fractures in the yarn body. This friction weakens the yarn, leading to frequent warp breaks that force the loom to stop.
Selection Procedure
Sizing charts provided by loom manufacturers establish the required clearance margins for different linen yarn grades. To optimize weaving performance, the mill chooses the appropriate heald eye dimensions by matching the maximum diameter of the flax slub to the internal width of the metal eye. Technicians record these specification choices in the loom setup sheet before threading the warp sheet.
A tight fit risks yarn breakage, whereas an excessively loose fit impairs the precision of the shed opening, causing the weft insertion mechanism to malfunction and resulting in costly down time.
