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What are the causes of weft shrinkage in water jet looms

Release time:

2024-05-21 14:10

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What are the causes of weft shrinkage in water jet looms

Solution to the following issues:

1. The pressure of the main and auxiliary nozzles is too low, and the weft conveying force is too weak;

2. There are flying debris blocking the main nozzle, resulting in low actual air pressure and flow rate;

3. There is air leakage in the main nozzle or auxiliary main nozzle air duct;

4. The weft yarn has a lot of fuzz and high twist;

5. The shear pressure is too low, causing the weft yarn to rebound;

6. The warp yarn on the supply side is loose.

What is the reason for the side weft shrinkage of waste edge yarn?

1. The opening angle is too early, and when the weaving mouth is closed, the weft end cannot be straightened;

2. The air pressure of the main and auxiliary nozzles is too low, resulting in slow and unstable weft flight speed and low weft tension;

3. Inappropriate height of the warp frame affects the flying speed of the weft yarn, causing weft shrinkage;

4. Improper timing between the main nozzle and the auxiliary nozzle resulted in the weft yarn flying in a relaxed state;

5. Leakage and blockage of the main and auxiliary nozzles and trachea;

6. The distance between the several secondary nozzles at the end is too large;

7. Left side scissors cut too early, resulting in poor cutting;

8. The right side twisted edge yarn has poor twisted edges, or the waste edge yarn is not woven well by the weaver, which cannot grip the weft yarn, causing the weft yarn to rebound and produce weft shrinkage;

9. The twist of weft yarn is large and unstable, and the twist rebound force is too large: the weft yarn has too low moisture regain, low tension, and is prone to curling, causing weft shrinkage;

10. The weft yarn is wound unevenly on the weft storage device, and the timing of the stop magnetic needle's rise and fall is not properly matched with the spraying time.

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