Joint Integrity
Mechanical retention of yarn strength across a pneumatic joint defines the structural quality of yarn connections in winding. High air splicing efficiency ensures that yarn joins can withstand the high tension of high-speed weaving and knitting without breaking. This retention is measured as a percentage of the parent yarn strength.
Weak joins cause frequent machine stoppages during subsequent fabric formation.
Verification Method
Tensile testing on automatic strength testers verifies the performance of spliced regions. A set of twenty spliced samples undergoes rapid extension to determine the average breaking force of the joints. Comparing this value to the strength of the unspliced yarn yields the efficiency value.
Splicers that consistently deliver low results require immediate maintenance or adjustment of air pressure.
Production Influence
Optimal air pressure and duration are critical parameters for successful fiber intermingling. Low air pressure results in insufficient fiber entanglement and a bulky, weak joint. Excessive pressure or duration can damage the fibers or shred the yarn ends.
Setting these parameters correctly for different yarn counts and twist levels minimizes downstream defects.
Operational Margin
Frictional properties of the fiber can limit the effectiveness of pneumatic jointing. High twist yarns or those with heavy lubricant coatings resist proper untwisting and blending. Splicing performance decreases under these conditions.
