The main is the weft of the jet pressure or the weak weft.
Reasons for the formation
(1) The main nozzle is too stressed.
(2) The shear blow is too strong.
(3) The filling yarn is uneven and the yarn is very thin.
Elimination method
(1) Reduce the pressure of the main nozzle.
(2) Reduce the pressure of shearing and blowing.
(3) Replace the filling yarn and take measures to improve the quality of weft yarn.
Broken weft in weft insertion
The weft insertion force is too strong, too long or the weft details are blown off in the width range of the width of the loom, causing the loom to stand or form a double defect.
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