Determining Loom Reed Denting Plans for High-Density Woven Fabrics
Determining loom reed denting plans for high-density weaves requires balancing target ends per centimetre against open air space ratio to prevent beat-up binding.
Splay Angle
Geometric Divergence
Angular deviation of the warp yarns as they pass from the reed to the temple and fell line is a critical geometric measurement in loom setup. This parameter, known as splay angle, occurs because the fabric is narrower than the drawn-in width of the warp in the reed due to weft contraction. Managing this angle prevents excessive friction and strain on the outermost warp ends, which are highly susceptible to breakage.
Proper adjustment of the temples helps control this angle and maintains fabric width.
Warp Tension
High divergence angles increase the friction between the warp yarns and the reed wires during beat-up. This rubbing can damage the outer yarns, leading to loose ends and stop-motion trips. Adjusting the warp beam tension can reduce this divergence by limiting the fabric contraction before it reaches the take-up roller.
Temple Positioning
Installing appropriate temples close to the fell line keeps the fabric at its maximum width, minimizing the divergence. This setup must be checked during every warp change to ensure the yarns are not subjected to unnecessary stress.
Defect Mitigation
Consistent monitoring of this angle ensures that the selvages are formed correctly and without distorted patterns. This check is crucial for heavy or high-density fabrics.