When making yarn-embedded (covered) fabrics, if the car […]
When making yarn-embedded (covered) fabrics, if the car is not adjusted properly, the yarn will turn over, that is to say: the yarn that should only appear on the reverse side of the fabric will appear on the front side. When making this kind of fabric, the mechanics or watchers will have their own shunting experience, no matter which method, as long as the silk is not turned, it will be successful; this is a technique to operate on the basis of experience.
The following are some of my experience in shunting, for reference only.
For example: when producing single-sided fabric, the yarn seen on the front of the fabric is called the main yarn (narrow yarn feeder), and the yarn seen on the back is called the secondary yarn (wide yarn feeder).
First consider from the tuning machine
1. The auxiliary yarn feeder is higher than the main yarn feeder; the main yarn feeder should be as low as possible, but not too low, at least the grinding feeder cannot be felt when the needle is pushed up, and the auxiliary yarn feeder should be as high as possible, but not as high as the needle hook Because the yarn feeder is too high to eat the auxiliary yarn, it will only eat the main thread or jumper (this may also happen if the position of the yarn feeder is not correct).
2. The spring of the elastic wire should be loosened. Including the side springs on both sides and the pick-up springs on the machine table must be loose (but not so that the yarn breakage alarm frequently appears), and if the main yarn passes through the yarn feeder, then the secondary yarn must also pass.
3. Note that the secondary yarn feeder (wide yarn feeder) may not be able to cut yarn when cutting yarn on both sides. The KPR and KPL values should be adjusted on STOLL, depending on the yarn feeder stop when cutting yarn.
5. If it is to weave this kind of fabric with a double-hole yarn feeder. Then you can only adjust the distance between the front and back of the yarn feeder and select the middle yarn feeder track. The other principles are the same as above.
6. Too small traction setting and too fast machine speed may also cause wire turning.
2. Adjustment method in procedure:
1. Arrange the main yarn feeder on the middle track (No. 4 or No. 5). For the secondary yarn, use a slightly biased yarn feeder. If it is two-color, then use No. 5 main yarn and No. 3 secondary yarn;
If it is a two-color fabric: such as jacquard fabric (two-color floating jacquard with elastic yarn or double-sided jacquard), use No. 5 and No. 3 at the same time, and use No. 4 and No. 2 for the other color at the same time. (I also tried to go at the same time on the 4th and 6th, and on the 5th and 7th at the same time)
2. When making single-sided tissue, use one or two stitches of the side stitch (the number of stitches that can be stitched) with the bottom stitch.
The above method is only my general principle when shunting. If there is still a wire turning situation, then some links may not be in place. For example, the position of the yarn feeder (I also tried to adjust the distance between the yarn feeder and the back and forth with a thin paper sheet), whether there is any scraping on the path of the elastic yarn, the deformation of the sinker, and so on.
In addition, I don’t know if my peers have such feelings: every new model often has problems of one kind or another when it just gets on the car. Sometimes, even though you think you have adjusted everything that needs to be adjusted, it’s still not good. But after weaving some films, it's much better.