Tangled yarn tip or bent weft breakage At the tip of the weft yarn on the right side of the fabric, there is a slight tangle or bend, forming a short weft and causing a stop. Reasons for form...
Tangled yarn tip or bent weft breakage
At the tip of the weft yarn on the right side of the fabric, there is a slight tangle or bend, forming a short weft and causing a stop.
Reasons for formation
(1) The opening is unclear due to loosening of the edge yarn, twisted edge yarn, and false edge yarn on the right side of the fabric, or warp yarn defects, flying flowers, etc.
(2) The main nozzle pressure is too high, or the installation is not standard.
(3) The main nozzle injection time and the electromagnetic needle action time are not coordinated properly.
(4) The height and position of the electromagnetic needle are not standard.
(5) The compressed air pipeline is leaking.
(6) The auxiliary nozzle pressure is too low, and the height and angle are inappropriate.
(7) The scissors on the left side are not sharp.
(8) The left side of the selvage warp is loose.
(9) The reed surface is not clean, with flying flowers and debris attached.
(10) The solenoid valve is not working properly.
Elimination method
(1) Increase warp tension or remove yarn defects and fly adhesion.
(2) Reduce the main nozzle pressure or adjust the main nozzle pressure position.
(3) Advance or delay the development time of the electromagnetic needle, and advance or delay the main nozzle injection time to an appropriate time.
(4) Check according to timing standards and installation specifications, and adjust the electromagnetic needle.
(5) Regular inspection of compressed air pipelines.
(6) Increase the auxiliary nozzle pressure and check its height and angle (depending on the type of weft yarn).
(7) The scissor blade on the left side must always be kept sharp.
(8) The twisted edge warp must be threaded correctly in the healds and reeds.
(9) Always keep the special-shaped reed surface clean.
(10) Press the test button on the control panel. If the solenoid valve is found to have stopped working, check the solenoid valve. If the solenoid valve works but does not work during continuous operation, check the encoder.
Weft yarn bending type broken weft
The U-shaped bend of the weft yarn is caused by insufficient weft insertion, poor shedding and delayed arrival of the weft yarn. This will cause the loom to stop or form double thin weft defects.
Reasons for formation
(1) The injection time of the main nozzle and the action time of the electromagnetic needle are improper.
(2) During shearing, the weft yarn comes out of the electromagnetic needle.
(3) The compressed air pipeline is leaking.
(4) The auxiliary nozzle pressure is too low.
(5) The opening of the loom is faulty, and the warp yarn has hairiness, big knots, flying flowers and other yarn defects.
(6) The opening amount is too small or the opening time is not standard.
(7) The warp yarn touches the tip of the auxiliary nozzle.
(8) The warp tension is too small.
(9) The position of the main nozzle is incorrect.
Elimination method
(1) Advance or delay the opening time of the electromagnetic needle, and advance or delay the injection time of the main nozzle.
(2) Adjust the action time of the left scissors and yarn guide to reduce the cutting resistance; or increase the shear blowing pressure appropriately.
(3) Check for bent or leaking mechanical valves and air pipes, and adjust or replace them.
(4) Increase the auxiliary nozzle pressure appropriately.
(5) Strictly control the warp joints to be less than 3mm, and remove warp defects such as large joints, feather yarns and flying flowers.
(6) Increase the opening amount, check and adjust the opening time.
(7) Place the auxiliary nozzleMove 0.1~0.2m laterally, and check the smoothness of the auxiliary nozzle head.
(8) Measure and increase the warp tension.
(9) Use the main nozzle gauge to correctly adjust its position.
The weft yarn and the warp yarn on the left side of the selvedge are twisted together to break the weft
The shedding time and the weft flight time are not coordinated properly. The weft yarn is caught by the warp yarn on the left side of the fabric, causing the loom to stop or form weft defects.
Reasons for formation
(1) The electromagnetic needle time, main nozzle yarn spraying time and opening time are not coordinated properly.
(2) The twisted yarn on the left side of the fabric is loose or the other edge warp yarns are loose.
(3) The main nozzle is not installed correctly.
Elimination method
(1) Delay the time when the weft yarn leaves the electromagnetic needle and advance the opening time.
(2) Correct the tension of the twisted edge yarn and false edge yarn, or correct the opening time.
(3) Use the main nozzle gauge for correct adjustment.
Weft and warp yarns are twisted and broken
The weft yarn is twisted with the middle warp yarn to form an S-shaped bend. Mainly due to uneven warp tension in the warp sheet or yarn defects attached to the warp yarn, shedding faults may cause the loom to stop or form double deweft defects.
Reasons for formation
(1) The warp yarn tension is too small or the yarn tension is seriously uneven.
(2) Warp yarn defects (many feathers, big knots, neps, cotton balls, flying flowers attached, etc.).
(3) The opening is too small.
(4) The left scissors cut the yarn poorly.
Elimination method
(1) Measure and increase the warp tension to eliminate factors such as uneven local tension.
(2) Remove yarn defects and the splicing tail yarn does not exceedover 3mm.
(3) Increase the opening height appropriately.
(4) Adjust the left scissor action time and blade engagement amount to make the scissors sharp.
Weft insertion length uneven weft breakage
The weft yarns introduced into the weaving fall are of different lengths, resulting in long and short wefts. It is mainly caused by unstable length measurement and weft insertion and insufficient weft insertion force.
Reasons for formation
(1) The amount of weft pre-winding is insufficient.
(2) The closing time of the electromagnetic needle is too early.
(3) The main nozzle is blocked by cotton yarn and the pressure is too low.
(4) The weft winding shape is poor or the winding hardness is inappropriate. The quality of the weft yarn is poor, and there are many yarn defects, such as splices, flying lint and yarn waste.
Elimination method
(1) Remove flying flowers and check the jet airflow.
(2) Wind the yarn correctly again.
(3) Adjust the pressure according to prescribed methods and standards.
(4) Appropriately increase the prewinding amount of the weft feeder.
(5) Delay the closing time of the electromagnetic needle.
(6) Increase the main nozzle pressure.
(7) Remove the lint clogging the parts.
(8) Change the form of weft winding, improve the hardness of the weft tube, greatly improve the quality of weft and reduce yarn defects.
Yarn tip blow-off type weft breaking
The main reason is that the air jet pressure of weft insertion is too high or the weft yarn has weak knots.
Reasons for formation
(1) The main nozzle pressure is too high.
(2) The shear blow is too strong.
(3) weftThe evenness is uneven and the yarn body has many details.
Elimination method
(1) Reduce the main nozzle pressure.
(2) Reduce the shear blowing pressure.
(3) Replace the weft yarn and take measures to improve the quality of the weft yarn.
Weft yarn blow-off type weft breakage
The weft insertion force is too strong, the action time is too long, or the weft yarn details are blown off within the width of the fabric, causing the loom to stop or form double thin spots.
Reasons for formation
(1) The weft release angle is too small.
(2) The pressure of the main and auxiliary nozzles is too high, the opening (start and end time) is too large, and the injection angle of the auxiliary nozzles is too large.
(3) The weft yarn has detailed weak yarn.
Elimination method
(1) Increase the release angle appropriately.
(2) Reduce the pressure of the main and auxiliary nozzles, check the weft yarn flight curve, reduce the opening (start and end time), avoid excessive injection, and reduce the injection angle of the auxiliary nozzle.
(3) Exchange the weft yarn to improve the quality of the weft yarn.
The weft yarn is broken on the storage side
During the weft release and stop process, it occurs because the weft insertion force is too strong or the weft has weak details.
Cutting error type weft breakage
The shearing error type of weft breakage is caused by the weft yarn on the side of the main nozzle not being cut after weft insertion but before beating up.
Reasons for formation
(1) The scissor blades are sharp and poorly meshed.
(2) The scissors are poorly installed and the cutting time is not standard.
(3) The shear blowing pressure is too low.
(4) The weft reaches the opposite side later.
Elimination method
(1) Grind the blade periodically and adjust for good meshing.
(2) Correct the position and adjust the time according to the scissors installation specifications.
(3) Appropriately reduce the shear reduction blowing pressure.
(4) Increase the pressure of the main and auxiliary nozzles and extend the injection time of the auxiliary nozzles.
Stop by mistake
The weft yarn reaches normal, but due to abnormal weft yarn flight, twisted edge yarn, weft catching edge yarn, electrical failure and other reasons, the no weft arrival signal is mistakenly sent, causing the machine to stop.
Reasons for formation
(1) It is abnormal for the weft yarn to enter the weft-catching edge yarn.
(2) The yarn on the right side of the twisted edge is loose.
(3) The shape or position of the weft yarn reaching the probe is incorrect.
(4) There is a problem with the weft probe cable, or the surface of the steel port reflection area of the probe is not clean.
(5) The sensitivity of the weft detection head is poor and the detection board is faulty.
(6) The gap between the weft probe and the reed is inappropriate.
(7) Vibration of special-shaped reed teeth.
Elimination method
(1) Adjust the position of the nozzle to remove lint and solve the problem of loose weft yarn.
(2) Adjust the edge yarn tension to make the edge yarn reed meet the specifications.
(3) Adjust the angle of the latter set of auxiliary nozzles and keep the distance from the weft detection head WWF1 to about 50mm.
(4) Replace the faulty weft finder promptly and keep the probe and reed clean at all times.
(5) Check the sensitivity of the weft yarn detector so that it does not shut down the vehicle empty. Also check and replace the weft probe board.
(6) Adjust the gap between the weft detector and the reed according to the installation specifications.
(7) Sticking a black tape on the reed can not only reduce the vibration of the reed teeth, but also prevent the spread of the reed jet airflow.
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