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Main problems and solutions in rapier loom weaving(3)

Main problems and solutions in rapier loom weaving(3)

Issue Time:2021/07/26
17. What are the reasons for feeding errors on rapier looms?
There are scattered piles and debris in the feed clamp, and the clamp cannot hold the weft effectively.
The filling cut time is too early, the filling into the filling clamp is not deep enough, and the filling feed clamp force is too small.
The weft tension is unreasonable and the clamping force of the clamping device is too small.

18. What is the reason for the waste yarn to be woven into the fabric?
Waste side heald frame leveling time too late.
The weft separates from the splice too late, resulting in too long waste edges.When the clipper enters the shed again, the waste yarn is carried to the next weave.
The number of ends through the waste side heald frame is not enough, and the waste side is not effectively captured.

19. What is the reason for the temple pattern on rapier looms?
The warp is embedded in the mirror leg between the copper ring, copper ring block, rotation is not flexible.textile weaving machines manufacturers
A needle in a copper ring is bent or broken.
The mirror leg ring does not conform to the knitting type, including needle type (thick needle, medium needle, fine needle, extra-fine needle), needle length (0.2mm, 0.4mm, 0.6mm, 0.8mm).
Temple installation location is insufficient.
20. What kind of sideburns should be used to produce fine extra-high density fabrics on rapier looms?loom suppliers
For fine, ultra-high density fabrics, it is best to use rubber mirror legs to maintain the fabric surface and reduce mirror leg defects.

21. How to control the weft tension of rapier loom?
The draw tension of the filling cone is controlled by a hairpin sensor on the back of the filling feeder.The weft tension on the guide is controlled by the secondary clip.During feed, the tension of the filling is controlled by the spring blade of the feed.The tension of the filling is controlled by the spring of the pick - up hopper.

22. How does rapier loom select the brush ring of the filling machine according to the twist direction of the filling?
Generally, weft is Z twist and warp is S twist.The tilt direction of the weft bristle brush should be the same as the twist direction of the stretch yarn;Otherwise, the weft will be untwisted, increasing the chance of broken weft.

23. How to determine the position of the backrest of rapier loom according to the fabric structure?
Generally speaking, in flat weave, the back of a chair should be higher than chest beam, in order to achieve flat weave flatness and fullness.In twill and jacquard braiding, the back of the chair should be lower than the chest beam to achieve the uniformity, depth and straightness of the twill fabric.

24. How to determine the front and back position of the backrest according to the raw materials and weaving patterns of the fabric?
When weaving hemp and wool fabrics on rapier looms, the short warp line should be used, and the back of the chair should be moved forward to the first hole.When knitting cotton cloth, the back of the back should be placed in the second hole.When making silk, the warp line should be extended and the back of the chair should be placed in the third hole.

25. What is the reason for the occurrence of defects on fabrics produced by rapier looms?How to prevent it?
The main reason is that the opening of the shed is unclear.Shuttleless looms are usually woven with small openings and high tension.When the shed was fully opened, the height of the shed was only 2.8~3.2cm at the reed.The rapier clamp is operated in the shed for a long time to ensure a smooth filling handover.The rapier games put a heavy strain on the shed.At the same time, if the weft opening time is not well matched with the weft insertion time, it can also lead to float defects, especially in the weaving of high warp and jacquard fabrics with late weft opening.
During the preparation, try to keep the warp tension uniform during the winding, warping and sizing.
Pay attention to reed density when sizing.The number of threads in each dent on either side can be slightly less than in the middle, so that the finished beam becomes a slightly inward-bending structure.Therefore, a certain amount of tension should be ensured during warp opening to compensate for the relaxation of side warp tension caused by the warp being squeezed by the chuck and the clamp belt.
Adjust the rapier loom scheme.In order to increase the yarn clearance rate, the yarn opening time can be set earlier, or the stop frame can be moved forward to shorten the length of the back half shed.
Strengthen first beam inspection and first batch fabric, defect report, timely repair.
Ensure the quality of the warp.

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