JPS60215824A - Production of yarn - Google Patents

Abstract

PURPOSE:To prevent yarn unevenness and obtain uniform spun yarns, by paralleling a given number or more of fine constituent fiber bundles having specific few twists, doubling the bundles, and stretch-breaking the resultant tow. CONSTITUTION:Twists at >=0.2 turns/m are given to fine constituent fiber bundles and 6 or more above-mentioned fiber bundles are wound while being paralleled to afford an undrawn tow 1, which is then drawn if necessary and stretch- broken (turn off) between rollers 4 and 5 at a high ratio to form fine short fiber fleeces. The resultant fleeces are entwined in an air swirl nozzle 6, passed through rollers 7 and wound by a winder 8. Thus, mutual fibers are scarcely entangled without causing excessive slubs nor broken yarns nor beltlike unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a yarn by cutting and conjugating continuous long fiber bundles.

(Prior art) Conventionally, a method for rationally producing spun yarn has been to cut a continuous long fiber bundle (so-called tow) into thin fiber bundles of a predetermined thickness by shredding, and then conjugate these. It is known that the fibers can be made into spun yarn-like threads. However, the main point of this sword body is how to evenly tear the thick tow to obtain threads of a certain thickness, and if the tow fibers are disordered, group cuts will occur immediately, which can be severe. Spots appear. Furthermore, the threads break and production becomes impossible.

In actual production sites, even if the tow fibers are handled with care, problems often occur in the process due to the tow being disorganized or the tension cutting machine being poorly adjusted.

(Objective of the Invention) The object of the present invention is to always stabilize tension cutting to prevent yarn unevenness without causing such problems, to obtain uniform yarn, and to improve productivity by reducing the number of yarn breakages. The goal is to propose ways to

(Structure of the Invention) That is, the present invention provides a method for manufacturing a yarn by cutting and tying a continuous long fiber bundle, in which at least six thin component fiber bundles are fused as the continuous fiber bundle. The present invention is a method for producing a yarn, characterized in that the constituent fiber bundles have a twist of 90.2 times or more.

FIG. 1 is a process diagram showing an example of the process of producing yarn by cutting and conjugating continuous long fiber bundles. In Fig. 1, reference numeral 1 denotes an undrawn continuous fiber bundle (tow) that is a raw material, which is supplied from p-lar 2, heated by heater 3, and then drawn between p-lars 2 and 4. Nagishin tow is formed, which is then pulled and shredded at a high magnification between rollers 4 and 5 to become thin short fiber fleece, which is further tied together by a rotating nozzle 6 so that it can be handled as yarn, and then passed to roller 7. After that, it is wound up by winder 8. FIG. 2 is a process diagram showing an example of such a tow manufacturing process, and FIG. Roll it up and return it as unstretched tow 1.

On the other hand, in the case of the tow used in the present invention, as shown in FIG. After the tow is applied, as shown in FIG. 2 (c), the tow is rolled up with another winder 12 while being aligned to form an unstretched tow 1'. In this case, if the required number of twists is given, the r-twisted yarn may be replaced by untwisted yarn. The undrawn tow 1' obtained in this way is fed to the process shown in Figure 1 and made into yarn, but when the undrawn tow is stretched and then subjected to tension cutting as in this case, The number of twists applied decreases by the stretching ratio, so
Therefore, it is necessary to hang it on more eyes. In other words, before cutting, the constituent delicate bundles must be subjected to at least 0.2 strokes per m. If the number of twists is too large, the twist itself will inhibit tension cutting, so it is desirable that the number of twists is at most 10 twists per m.

Furthermore, if the number of mergings is too small, unevenness will become noticeable or thread breakage will occur, so at least 6 or more are required, preferably 15 or more. On the other hand, if the number of fibers is increased too much, they will not merge, and they will easily thaw each other, so the number of single fibers in each constituent fiber bundle should be at least 2.
It is better to keep the number to a level that keeps the number above 0.

As the continuous fiber bundle to be used, synthetic fibers are preferable from the viewpoint of productivity, cost, and product functionality, and among them, polyester is suitable for use in products and has the best adaptability, but other materials may of course be used. In addition, if stretching is necessary, in addition to connecting it with the process before tension cutting as in this example, it can be performed in advance, for example, in conjunction with the process of aligning the constituent fiber bundles, or at the stage of spinning the constituent fiber bundles. It is fine as long as it is appropriate, such as keeping it in place.

In the above example, the fibers are divided and wound using a large number of winders 11 to form a large number of undrawn fiber bundles Y, but instead of dividing into one, many thin undrawn fiber bundles are manufactured by another means. It is also possible to use it as the undrawn fiber bundle r.

(Action of invention) The functions and effects of the present invention will be explained while comparing them with conventional methods.

In order to obtain a uniform yarn, which is the object of the present invention, it is necessary to constantly perform tearing and shredding at a constant magnification between P-G-4 and P-5, for example, as shown in Figure 3 (A). If there is a part a that is entangled with the single fibers constituting the tow 1, smooth tension cutting will be hindered and the tow will break all at once, resulting in unevenness and thread breakage. On the other hand, Figure 3 (I:I) shows tow 1 used in the method of the present invention, which is obtained by twisting finely divided fiber bundles and then merging them. The fiber bundle is twisted at least 0.2 times or more per twist. Therefore, even if there is a tangled part of the single fibers, this twisting prevents the tangle from reaching the other constituent fiber bundles, so even if tension cutting is hindered by this tangled part, the entire tow will be cut at once. It doesn't break easily, and even in the worst case, the thickness of the constituent fiber bundles stays the same, so you won't get the strawberry-like slap or thread breakage.

In other words, even a slight twist like this prevents the fibers from getting entangled with each other, which is surprisingly effective in preventing yarn breakage and unevenness.
This is particularly effective for fiber bundles that are easily tangled. FIG. 3 is a plan view showing the state of the tow supplied to the tension cutting process.

Furthermore, this method is particularly effective when the tension cut length is long. In other words, when the length of the stretch cut becomes long, long spots occur when the tow is cut in groups, and unnatural band-like (thick thread-like) spots appear on the woven or knitted fabric, which deteriorates the aesthetics. According to this method, it is possible to obtain a product with a natural appearance without the appearance of band-like spots, so even when the cutting gauge is long such as 150W or more, or even when it is long such as 300x or more, the product has a natural appearance. You can get the thread of In this case as well, it is possible to make the spots more visible by passing the tow through the gill or 2-mira draft several times while doubling it after cutting the tow, but as in this example, doubling after cutting the tow If you want to make thread immediately without any problems, there is no way to improve the specifications. Therefore, the present invention is particularly effective when the tows are directly bound together continuously after being cut, or when the tows are directly bound together while being drafted at most twice to form a yarn.

(Example) Polyester was melt-spun using a spinning press having 2,880 spinning holes, and 12
A 200 door / with 12 winders while dividing
The film was wound up at a speed of 1.0 am to obtain 12 intermediately oriented unstretched tows of s7o L/z4oFi/. Next, by unwinding this tow from the length direction of the bobbin, the outer circumference of the bobbin ~
Arrange them all again, making sure to untwist each of them 0.6 to 1.7 times per round on the inner circumference, and make a denier of about 8.
0 (jO, fiment number 2880) was rolled up as an undrawn tow. This was further processed in the process shown in Figure 1 to l 60 '0
After stretching with a stretching ratio of 1.55 times while heating with a plate of
Subsequently, this was cut using a tension cutting gauge-600-9 tension cutting magnification of 38.
After cutting at a speed of 8 times, conjugation was applied with an air swirling nozzle of 4.0 m/d, and the yarn was wound into a 40-thread yarn at a speed of ao om/-. After twisting this yarn with +SOt/+a, it was made into a plain weave and finished with x2% alkali weight loss. Despite the very long fiber length, the fabric appearance was that of normal 64 katsuto spinning. The irregularities are random and natural like thread, and the repulsion is 92 because the fibers are extremely long.
A wonderful tropical-style fabric with little fuzz and excellent luster was obtained.

(Comparative Example) In the above example, the spun undrawn tow was not divided, but was directly taken into LM with about 500 denier. This was made into thread in the same manner as described above in the process shown in Figure 1, but the threads tended to break due to group cuts at slightly tangled parts of the tows, and the resulting fabric had a thread of 5 to 10 threads. -The strip-shaped long-circle plate about the width was noticeable and unwearable, reducing the quality of the appearance. In addition, to prevent this, the tension gauge was changed from 600 to 250.
When the length was shortened, this appearance was considerably improved, but at the same time, the anti-dust properties were reduced to 85 cm, the gloss was also reduced, and the characteristics of the ultra-cut length were lost accordingly.

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing an embodiment of the stretch-cut conjugation process used in the present invention, Fig. 2 is a process diagram showing an example of the manufacturing process of the tow according to the conventional method and the tow used in the present invention, FIG. 3 is a plan view showing the state of the tow supplied to the tension cutting process. 1.1'...Continuous long fiber bundle 1'...
...Constituent fiber bundle patent applicant Teijin Ltd.

Claims (1)

[Claims] In a method of manufacturing a yarn by cutting and conjugating a continuous long fiber bundle, the continuous long fiber bundle is a combination of at least six thin constituent fiber bundles, and the constituent fiber bundle is A method for producing a yarn, characterized in that the yarn has a twist of 0.2 times or more per m.