Dent Density
Loom density numbering designates the number of open dents per unit width in the sley through which warp ends are drawn. The specification of reed count sets the theoretical warp distribution and guides the spacing of threads across the full weaving width of the machine. The metric uses standard units such as dents per centimetre, dents per two inches, or French hundred counts depending on the regional machinery origin.
It applies strictly to the rigid wire comb on weaving looms, stopping at the free fabric state where cloth shrinkage alters end spacing.
Sley Geometry
Setting the correct reed count prevents excessive friction between adjacent flax warp ends during shed opening and beat-up cycles. Because linen yarns carry irregular cross-sections and protruding surface fibrils, crowded denting causes yarn chafing and frequent warp breaks. Weaving technicians calculate the necessary dent spacing by factoring in the nominal yarn diameter, the number of ends drawn per dent, and the planned greige fabric width.
The loom setup sheet specifies both the reed number and drawing-in draft before the warp beam is mounted on the rapier or air-jet loom.
Setting Variation
Weave room managers monitor reed wear and dent alignment to prevent vertical reed marks from appearing in high-density linen fabrics. Damaged or bent reed wires alter the effective reed count locally, leaving light or dark longitudinal streaks that cannot be removed in wet finishing. During fabric specification changes, the technician swaps the reed comb to match the target construction of the new production run.
Grey cloth inspection reports log the reed density alongside measured warp ends per inch to monitor off-loom fabric contraction. Selecting the proper reed configuration ensures uniform thread spacing and structural stability in the finished linen yardage.
