Pneumatic Splicing Quality for Warp Applications
topic
Pneumatic splicing for warp yarn preparation requires splice strength of 80 to 95 percent of parent yarn tenacity and splice diameter not exceeding 130 percent of parent yarn diameter to pass through heddle eyes and reed dents without snagging, with splice chamber geometry, air pressure of 4 to 7 bar, and untwisting duration optimised for each yarn count and fibre type, verified by systematic strength testing of 30 to 50 splices per yarn lot and diameter measurement confirming dimensional specification compliance.
Role
Provides the yarn joins that must pass through the mechanical constraints of heddle eyes and reed dents at weaving speeds above 500 picks per minute without causing loom stops, with warp application splice requirements being more stringent than for knitting applications from the higher tension and abrasive contact that warp yarns experience in weaving compared to the lower tension weft insertion environment, requiring careful optimisation of splicing parameters for each yarn type used in warp preparation.