One of the main defects of economical jet looms is the entanglement or tortuous weft breakage at the yarn tip. When the weft is broken, it often causes the problem to stop, seriously affecting the weaving production efficiency. Analyze the reasons for its formation, and list the key factors to eliminate weft breakage.

The causes of weft breakage in economical jet looms:

(1) The edge yarn, twisted edge yarn, and false edge yarn on the right side of the fabric are loose or have warp yarn defects or flying flowers that cause unclear openings.

(2) The main nozzle pressure is too high or the device is not standard.

(3) The timing of the main nozzle injection and the timing of the electromagnetic needle action are not properly coordinated.

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

(5) Compressed air pipeline leaks.

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

(7) The left scissors are not sharp.

(8) The warp on the left edge of the fabric is loose.

(9) The reed surface is not clean, with flying flowers and debris adhering.

(10) Poor operation of the solenoid valve.

Method for eliminating weft breakage in economical jet looms:

(1) Increase the tension of the warp yarn or remove yarn defects and flying flowers.

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

(3) Advance or postpone the development time of the electromagnetic needle, and advance or postpone the injection time of the main nozzle to the appropriate time.

(4) Check and adjust the electromagnetic needle according to the timing and device standards.

(5) Regularly inspect compressed air pipelines.

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

(7) The left scissor blade must always be sharp.

(8) The threading method of twisted warp yarn in heddle and steel reed should be correct.

(9) Regularly adhere to the cleanliness of the irregular reed surface.

(10) Press the test button on the control board. If the solenoid valve stops working, check the solenoid valve. If the solenoid valve is working, but does not work continuously; You need to check the encoder.