JPS6346174B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for highly efficiently producing a composite spun yarn that has both the texture and appearance of a spun yarn and the excellent texture and functionality of filaments. .

Conventional technology Conventionally, a composite spun yarn of short fibers and long filament filaments was produced by using a spinning machine in the spinning process to supply filament yarn to the drafted roving, compound it, and wind it with a ring traveler while adding actual twist. The so-called core span technique is known. However, since this method uses actual twisting, the spinning speed is extremely low and is limited to a low speed of 10 to 20 m/min at most, and the amount of winding is small, resulting in a considerably high manufacturing cost.

On the other hand, recently, research and development has been carried out on a no-twist spinning method or a bundled spinning method, which has a fundamentally different manufacturing principle from conventional spinning methods, and is becoming capable of producing spun yarn with extremely high efficiency. That is, FIG. 1 is a process diagram showing an example, in which 1 is a tow made of continuous fibers, which is stretched and drawn between a delivery roller 5 and a tension cutting roller 9 that rotates at a higher speed than the delivery roller 5. The short fiber fleece is made into short fiber fleece by tension cutting and drafting, and is then passed through a tension cutting roller 9 by a fluid take-up nozzle 10 having a suction action.
The short fiber fleece carried out is bound by a fluid binding nozzle 11 having a swirling action, and wound up by a winder 14.

The present inventors have already utilized this method of producing spun yarn using fluid, and supplied another yarn at high tension to the tension-cutting roller 9, and the tension-cutting roller stretches, tension-cuts, and We have proposed a method for producing composite spun yarn, which is characterized in that it is composited with drafted staple fiber fleece and subjected to fluid treatment while maintaining the tension state of the yarn supplied to the tension cutting roller. 57-18093).

According to this method, a composite spun yarn in which the continuous yarn and short fiber fleece are very well intertwined can be obtained. However, in this method, when production is continued for a long time, one of the rubber rollers of the tension cutting roller 9 is easily worn out by the yarn supplied with high tension to the tension cutting roller, and this method has the disadvantage that tension cutting spots are likely to occur. It has been found. In addition, when producing high-grade yarns such as No. 80 or higher, when yarn is fed to the tension cutting roller, the tow being stretched is affected by the yarn, causing uneven nips of the tow and causing tension cutting spots. It has been found. Furthermore, it has been found that in this method, it is difficult to obtain a composite spun yarn with high bulkiness because the peripheral speed of the take-up roller cannot be made much slower than the peripheral speed of the tension cutting roller.

OBJECT OF THE INVENTION An object of the present invention is to improve a method for producing a composite spun yarn with low efficiency in conventional spinning methods. That is, a method for manufacturing composite spun yarns that can be produced stably at high speed and over a long period of time, from thick to high yarn counts, using the above-mentioned spinning method using fluid, and that has good texture and appearance. Our goal is to provide the following.

Structure of the Invention That is, the present invention involves passing a continuous long fiber fleece through a fluid binding nozzle between a delivery roller and a pair of tension cutting rollers that rotate at a peripheral speed higher than the peripheral speed of the delivery roller to bind the fibers. In a method for producing spun yarn that imparts properties to form yarn, the short fiber fleece carried out from the tension cutting roller is taken up in a state where it is aligned with another yarn by a pair of first take-up rollers, and then fluid conjugation is performed. This is a method for producing a composite spun yarn, which is characterized by passing it through a nozzle to impart conjugation properties between the two.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 shows a process of an example of the method of the present invention, in which 1 is a drawn tow made of polyester long fibers with a total denier of 1100 denier and a single filament denier of 0.5 denier, which is passed through a feeding roller 5,
Stretched and stretched between tension cutting rollers 9 rotating at a high speed of 21 times the circumferential speed of the delivery roller, 100
A short fiber fleece 6 having a count (cotton count) is used.
At this time, a trough-like guide 8 is provided to prevent the stretched tow from being disturbed by the accompanying air flow. on the other hand,
2 has a total denier of 50 denier and a single yarn denier of 1.4
It is a polyester multifilament yarn with a triangular cross section of denier, and the tension adjustment device 3
The above-mentioned 100 g of fluid is applied with a tension of
A fluid binding nozzle 1 which takes the short fiber fleece 6 of the same number as the same and has a swirling action.
1 to intertwine and wind the short fiber fleece 6 around the filament yarn 2 to form a second composite spun yarn 12.
It is pulled out from a take-up roller 13 and wound up as cheese 15 by a winder 14.

Here, the circumferential speed of the first take-up roller 7 needs to be lower than the circumferential speed of the tension cutting roller 9. That is, when the circumferential speed of the first take-up roller is faster than the circumferential speed of the tension cutting roller, the first take-up roller 7
The tension of the short fiber fleece 6 becomes equal to or higher than the tension of the filament yarn 2 supplied to the
When the filament yarn is subjected to binding processing by the fluid binding nozzle 11 between the first take-up roller 7 and the second take-up roller 13, the filament yarn becomes a loop or slack and is likely to be exposed to the outside of the composite spun yarn. As a result, when woven or knitted into a woven or knitted fabric, unevenness on the grain surface, irritation due to differences in dyeing, etc. occur, resulting in a poor quality appearance.

Therefore, the circumferential speed of the first take-up roller 7 needs to be at least 2% slower than the circumferential speed of the tension cutting roller 9, although it depends on the filament supply tension.

Further, the filament yarn 2 may be supplied to the short fiber fleece 6 and pulled together at any position between the tension cutting roller 9 and the first take-up roller 7, but the distance between the tension cutting roller 9 and the first take-up roller 7 is as follows: It is preferable to shorten the fiber length to 1.2 times or less of the average fiber length of the short fiber fleece 6. In other words, in this region, there is almost no conjugation between the filament yarn and the short fiber fleece, so this distance is calculated as the average fiber length of the short fiber fleece.
This is because if the length is longer than 1.2 times, the number of floating fibers that are not gripped by either the tension cutting roller 9 or the first take-up roller 7 increases, making it easier to break the yarn.

Here, the tow 1 may be made of polyester, polyamide, polyacrylonitrile, aromatic polyamide, or any other material as long as it is made of continuous long fibers, and the single yarn denier, cross-sectional shape, gloss, etc. may be appropriately selected depending on the purpose. . Further, as for the filament yarn 2, the above-mentioned fibers can be used as long as it is a continuous yarn, and it is not limited to multifilament yarns, but also spun yarns such as synthetic fibers and natural fibers can be used. Not limited. Further, the filament yarn 2 may be supplied in one piece or in plural pieces.

Functions and Effects of the Invention The composite spun yarn obtained by the method of the present invention has little unevenness in thickness and is untwisted, yet has enough strength to withstand weaving and knitting, and can be used not only in spun looms but also in spun looms. It can also be used in various innovative looms such as filament looms and water jet looms.

In addition, the composite spun yarn produced by the method of the present invention has a core mainly made of filament yarn and a sheath made of short fiber fleece, and can have a wide range of appearances from high to low bulk depending on the conjugation treatment conditions using the one-fluid conjugation nozzle. , texture etc. can be changed.

That is, as in Japanese Patent Application No. 57-189093, in the method of feeding filament yarn from a tension cutting roller, if the circumferential speed of the take-up roller 13 is made slower than the speed of the tension cutting roller and conjugation is imparted by fluid treatment, the filament yarn is There is a problem in that the tension decreases, and the filament yarn side of the obtained composite spun yarn becomes slack and comes out on the outside of the yarn, and the winding and entanglement with short fibers becomes weak. For this reason, it has been difficult to obtain a composite spun yarn with high bulkiness.However, according to the method of the present invention, even if the circumferential speed of the first take-up roller 7 is lower than the circumferential speed of the tension cutting roller 9, the filament cannot be removed. Since the tension of the yarn does not decrease, the circumferential speed of the first take-up roller 7 can be varied over a wide range. Therefore, it is possible to obtain composite spun yarns with various bulks, from low bulk to high bulk.

Furthermore, if the circumferential speed of the first take-up roller 7 is made slower than the circumferential speed of the tension cutting roller 9, the circumferential speed of the second take-up roller 13 can be made slower than the circumferential speed of the first take-up roller 7. This has the advantage that the conjugation between the filament yarn and short fibers can be further strengthened.

Example 1 FIG. 3 is a process diagram when the first take-off roller 7 and the second take-off roller 13 are integrated to form a stepped roller 17 as shown in FIG. 4.

Using this process, a multifilament yarn made of polyethylene terephthalate fiber with a total denier of 130 denier and a single yarn denier of 0.45 denier was used for tow 1, and the tow was cut into a 3.7-fold cut at a tension cutting section with a length of 750 mm. Short fiber fleece 6 with an average fiber length of 325 mm, equivalent to 150 count (cotton count) in terms of draft ratio.
I pushed myself to the limit. On the other hand, filament 2 has a full denier.
A polyethylene terephthalate multifilament yarn of 30 denier and a single yarn denier of 1.25 denier is used, and a tension of 9 g is applied by the tension adjusting device 3 to the short fiber fleece 6 from the tension cutting roller 9.
Align through the alignment guide 4 at the 200mm position,
And it is wound 4 turns around the first take-up roller 7 and the separate roller 16, which are 250 mm away from the tension cutting roller 9, and the circumference is 3% of the first take-up roller.
It was wound around a short second take-up roller 13 and a separate roller 16 for four turns, and then wound up with a winder 14. At this time, a fluid binding nozzle 11 having an interlacing effect is inserted at a position where the filament yarn 2 and short fiber fleece 6 that are aligned from the first take-up roller 7 to the second take-up roller 13 cross.
Conjugation treatment was carried out at 2.5Kg/cm ² . At this time, the circumferential speed of the first take-up roller 7 was set to be 3% slower than the circumferential speed of the tension cutting roller 9.

The core of the obtained composite spun yarn 12 is mainly occupied by filament yarn, and the sheath is mainly occupied by short fiber fleece which has become bulky due to the occurrence of fine loops and slack. Thickness unevenness with short fiber fleece closely intertwined with each other,
It was uniform with few nets.

Next, using a water jet loom, a fabric was fabricated using a polyethylene terephthalate multifilament yarn having a triangular cross section with a total denier of 50 denier and a single yarn denier of 1.39 denier for the warp yarns and a composite spun yarn obtained by the method of the present invention for the weft yarns. When woven, a high-quality fabric with a texture and appearance very similar to silk-spun fabrics was obtained. In addition, the weaving properties of the short fiber fleece are long, and there is little fluff, so there is less occurrence of fluff, and the filament yarns are aligned in the core, which has sufficient strength, so there is less yarn breakage. It was very good.

Comparative Example 1 A composite spun yarn was produced using the same equipment and conditions as in Example 1, except that the filament yarn 2 was fed from the upper part of the tension cutting roller 9 without being aligned. Poor conjugation,
Moreover, the filament yarn was exposed in a loop shape on the surface of the spun yarn, and only a composite spun yarn with a poor appearance could be obtained.

[Brief explanation of drawings]

Figure 1 is a process diagram showing the conventional twistless spinning method;
2 and 3 are process diagrams showing the method of the present invention, and FIG. 4 is a perspective view of the take-off roller used in FIG. 3. Here 1 is fiber tow, 2 is filament yarn, 3
is a tension adjustment device, 4 is a pulling guide, 5 is a delivery roller, 6 is short fiber fleece, 7 is a first take-up roller, 8 is a trough-shaped guide, 9 is a tension roller,
10 is a fluid withdrawal nozzle; 11 is a fluid conjugation nozzle;
12 is a composite spun yarn, 13 is a second take-up roller, 1
4 is a winder, 15 is composite spun yarn cheese, 1
6 is a separate roller, and 17 is a stepped roller.

Claims (1)

[Claims] 1 A tow or multifilament yarn consisting of continuous filaments is cut into short fibers by tension-cutting a tow or multifilament yarn consisting of continuous filaments between a delivery roller and a pair of tension-cutting rollers that rotate at a peripheral speed faster than the peripheral speed of the delivery roller. In the method for producing spun yarn, the short fiber fleece is passed through a fluid binding nozzle to impart binding properties between the fibers to form a yarn. 1. A method for producing a composite spun yarn, which comprises taking the threads in an aligned state with a pair of first take-up rollers, and then passing them through a fluid binding nozzle to impart binding properties between the two. 2. Claim 1, characterized in that the circumferential speed of the first take-up roller is slower than the circumferential speed of the tension cutting roller.
A method for producing a composite spun yarn as described in Section 1.