Joint Mechanism
High-pressure air streams that entangle loose fiber ends create a knotless connection during yarn winding. This process of pneumatic yarn splicing eliminates the bulky knots that cause yarn breakages during high-speed fabric formation. The automatic winder executes this task by trimming the yarn ends before mingling them with a burst of compressed air.
Technicians record the splice strength on the winder daily run sheet.
Splicing Parameter
Achieving a stable joint in stiff linen fibers demands careful regulation of the blast pressure and duration. Unlike flexible cotton, the inelastic nature of flax means that pneumatic yarn splicing must use higher pressures to force the stubborn fibers into a secure tangle. Winding operators adjust the air nozzles based on the yarn count, logging the pneumatic pressure settings on the machine configuration log.
If the pressure is too low, the joint will slip apart under tension, while excessive pressure can shred the yarn completely. This balance ensures that the yarn runs through the high-speed loom without breaking, maintaining high productivity across the loom room.
Yarn Integrity
Quality control at the winding stage assesses the tensile strength and appearance of the spliced joints. Splicing that conforms to the buyer’s standards must maintain at least eighty percent of the original yarn’s breaking force. In spinning mills, yarn clearers monitor each joint for thickness, automatically rejecting any pneumatic yarn splicing that creates an unacceptable bulge or slub.
This rigorous selection prevents defects from appearing in the finished fabric.
