Weft breaking of yarn tip tangled or curved type

Posted 2021-05-01 DaYaoTextile

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Weft breaking of yarn tip tangled or curved type

There is slight entanglement or bending at the tip of the weft on the right side of the fabric, forming short weft, resulting in stop.

Cause of formation

(1) loose edges, Hank yarns, false side yarn loosening or warp yarn defects and flying attachment cause on the right side of the cloth cause unclear opening.

(2) the main nozzle pressure is too high, or the installation is not standard.

(3) improper timing of main nozzle and electromagnetic needle.

(4) the height and position of the electromagnetic needle are not standard.

(5) air leakage of compressed air pipe.

(6) auxiliary nozzle pressure is too low, height and angle are not suitable.

(7) the left scissors are not sharp.

(8) the left side cloth warp is relaxed.

(9) the reed surface is unclean with flying flowers and impurities.

(10) the solenoid valve works badly.

Elimination method

(1) increase warp tension or remove yarn defects and fly attachment.

(2) reduce the pressure of the main nozzle or adjust the pressure position of the main nozzle.

(3) advance or delay the development time of the electromagnetic needle, and advance or delay the main jetting time to the appropriate time.

(4) check according to the timed standards and installation specifications, adjust the electromagnetic needle.

(5) check the compressed air pipeline regularly.

(6) increase the pressure of auxiliary nozzle and check its height and angle (depending on the type of weft).

(7) left scissors must always be sharp.

(8) the harness warp should be worn correctly in the heald and reed.

(9) the cleanliness of the reed reed surface is often maintained.

(10) according to the test keys on the control board, if the solenoid valve is found to stop working, check the solenoid valve, such as the solenoid valve, but do not work in continuous operation; check the encoder.

Weft broken weft breaking

The U bending of weft yarn is due to insufficient weft insertion, poor opening and delayed arrival of weft yarn. Make the loom stop or form double thin weft defects.

Cause of formation

(1) the main nozzle's jet time and electromagnetic needle action time are not proper.

(2) when weft is cut, weft is removed from the electromagnetic needle.

(3) air leakage of compressed air pipe.

(4) the pressure of the auxiliary nozzle is too low.

(5) failure of loom openings, warp yarn hairiness, big knots, flying flowers and other yarn faults.

(6) the opening amount is too small or the opening time is not standard.

(7) the warp touches the tip of the auxiliary nozzle.

(8) the warp tension is too small.

(9) the position of the main nozzle is not right.

Elimination method

(1) advance or delay the opening time of the electromagnetic needle and advance or delay the jet time of the main nozzle.

(2) adjust the operation time of the left scissors and guide yarn, so as to reduce the cutting resistance, or increase the shear blowing pressure appropriately.

(3) check the mechanical valve and trachea that bend or leak, adjust or replace it.

(4) improve the pressure of the auxiliary nozzle properly.

(5) strictly grasp the rules of warp joint less than 3mm, remove warp defects such as large joints, feather yarns and flying attachment.

(6) increase opening volume, check and adjust opening time.

(7) shift the auxiliary nozzle across 0.1~0.2mm and check the smooth end of the auxiliary nozzle head.

(8) measure and increase the warp tension.

(9) the position of the main nozzle is adjusted correctly by the main nozzle.

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