Tension Management
Kinetic energy reduction of the weft yarn at the final stage of its insertion into the loom shed prevents yarn breakage and recoil. Weft brake deceleration uses mechanical or electromagnetic force to slow the thread before it reaches the end of its travel. This process protects the yarn from the sudden impact of stopping at high velocities.
Insertion Dynamics
Modern weaving machines operate at speeds exceeding two thousand meters per minute, making the kinetic energy of the filling yarn substantial. Without effective weft brake deceleration, the yarn would likely snap or bounce back into the shed, creating a defect known as a kinky filling. The braking force must be applied gradually to avoid creating a new tension peak that could also cause a break.
Fabric Quality
Correct braking ensures that the filling yarn is laid perfectly straight across the warp. If the weft brake deceleration is poorly timed, the fabric may show uneven density or structural flaws near the receiving selvedge. High precision brakes allow for the use of weaker or more decorative yarns that would otherwise fail under the stresses of high speed weaving.
Component Wear
Frequent and intense braking cycles put mechanical stress on the brake pads and the yarn guides. Regular maintenance of these parts is required to ensure that the braking force remains consistent throughout a production run.
