Assigning Spinning versus Sizing Root Causes in High Speed Weaving Faults
Differentiating spinning and sizing root causes requires cross-sectional microscopy and high-speed tensile testing to map size encapsulation against yarn mass variation.
Pneumatic Splice
Intermingled Connection
The fusion of two yarn ends using a blast of compressed air creates a knotless join that maintains the continuity of the flax thread. A pneumatic splice works by untwisting the fibres of each end and then re-tangling them together under high pressure. This technique replaces traditional knots which often snag in the needles of knitting machines or the reed of a loom.
Aerodynamic Action
A splicing chamber directs a controlled flow of air to swirl the individual flax filaments into a cohesive structure. During the cycle, the pneumatic splice reaches a strength that approximates the original yarn while remaining nearly invisible to the naked eye. Precise timing of the air burst ensures that the ends do not fray or become too bulky.
Technicians calibrate the pressure based on the yarn count and the amount of twist present in the linen. Effective splicing reduces the downtime caused by thread breaks during the winding process.
Tensile Reliability
Strength testing on the winding frame confirms that the join can withstand the high tensions of high-speed weaving. If the pneumatic splice is too weak, the warp thread will break and cause the loom to stop. Frequent failures suggest that the air filter is clogged or the splicing head requires cleaning.