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.
Reed Mark
Visual Irregularity
Warp-way streaks of light or heavy density in a woven fabric represent a common structural defect. This flaw, commonly called a reed mark, occurs when warp yarns are unevenly spaced across the fabric width during the beat-up phase. The metal wires of the reed, which group warp ends into dents, can leave permanent channels if the yarn spacing does not redistribute evenly.
Correcting this issue requires adjusting loom settings such as yarn tension or shed timing.
Mechanical Origins
Bent or damaged reed wires force adjacent warp ends together, leaving a gap on either side of the affected dent. This defect also appears when there are too many yarns drawn through a single dent, preventing them from spreading out after beat-up. Loose reed mountings cause the entire assembly to vibrate, resulting in periodic streaks across the cloth.
Loom Adjustment
Adjusting the let-off tension helps the warp yarns redistribute themselves more easily across the fell line. Late shedding, where the shed closes after the beat-up, allows the warp ends to shift and hide the wire gaps.
Inspection Protocol
Fabric examiners use backlit tables to spot these streaks before the material proceeds to the dyeing or finishing stage. Early detection allows the loom technician to adjust or replace the reed before producing large quantities of substandard goods.