Calculating Loom Reed Width and Warp End Density for Plain Weaves
Derive loom reed width by compounding greige take-up and wet finishing contraction percentages onto target cuttable width while balancing dent air space ratios.
Metric Reed Number
Density Specification
Loom geometry specifications describe the spacing of the reed wires across the weaving width. Metric reed number indicates the quantity of dents or gaps present in a ten centimeter span of the metal comb. This value determines the horizontal density of the warp ends before they undergo the beat-up motion.
Density Calculation
Calculation of the density relies on the relationship between the reed count and the total number of ends per unit width. Calculating the metric reed number involves dividing the ends per centimeter by the number of ends drawn through each dent. A higher figure results in a finer distribution of threads.
Precision in this setting prevents reed marks and ensures uniform fabric appearance across the entire loom.
Fabric Construction
Construction requirements for heavy canvas or fine poplin dictate the choice of reed. When the metric reed number is too low for the yarn diameter, excessive friction occurs between the moving wires and the fibers. This mechanical stress causes pilling or breakages during the high-speed operation of modern air-jet or rapier looms.
Equipment Standard
Standards for reeds allow mills to exchange components across different machine brands. Most modern weaving facilities adopt the decimeter basis for these measurements. The physical reed becomes the primary tool for controlling the finished width of the cloth.