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.
Leno Selvedge
Edge Binding
Standard shuttleless fabric edge stability requires cross-crossing motion where pairs of warp yarns twist around picks to prevent fringe unraveling at fabric margins. Finishing inspection standards evaluate leno selvedge as a narrow locked structural border formed by crossing standard warp ends with doup heddle yarns on either edge of the main fabric body. The mechanism applies to rapier, air-jet and water-jet production machines operating without tuck-in devices or true shuttle selvedges, ending at the point where thermal selvedge sealing or tuck-in mechanical fingers fold weft ends back into the main shed.
Threading Geometry
Doup heddles or specialized leno devices alter the path of stationary warps by lifting and crossing moving warps around them on alternate picks. This crossed locking system holds short filling ends firmly in place at high machine operating speeds. Proper adjustment of crossing tension prevents yarn breakage while ensuring the binding wire stays intact during high-speed shed opening.
Fringe Trimming
Mechanical cutters sever extra filling yarn protruding past the leno binder yarns immediately after pick insertion.
Tension Stability
Dynamic stress during wet finishing and continuous stenter drying subjects fabric edges to severe lateral tension. Loose edge locking permits selvage distortion, causing yarn slippage or edge tears inside finishing machines. Inspection protocols check edge firmness to confirm that leno selvedge constructions maintain structural integrity throughout scouring, dyeing and mechanical compaction.
Determining Reed Width Requirements from Yarn Takeoff Data
Determining required loom reed width requires converting unraveled weft yarn takeoff data into take-up fractions and adding wet processing shrinkage allowances.