JPS602717A - Manufacture of composite spun yarn - Google Patents

Abstract

PURPOSE:To manufacture a composite spun yarn having excellent feeling and appearance, stably for a long period, at a high speed, by combining a short fiber fleece with another yarn between a stretch-breaking roller and a fluid-drawing nozzle in the drawing of a short fiber fleece to a yarn, and passing the fleece together with the yarn through the fluid-drawing nozzle. CONSTITUTION:A drawn tow 1 of polyester filaments is subjected to the drawing and stretch-breaking between the feed roller 5 and a pair of stretch-breaking rollers 9 rotating at higher speed than the feed roller. The obtained short fiber fleece 6 delivered from the fluid takeup nozzle 10 is combined between the stretch-breaking roller 9 and the fluid drawing nozzle 11 with a polyester multifilament yarn 2 stretched under a tension of preferably 0.5-1.5g/d, and passed through the nozzle 11 to intertwine and wind the short fiber fleece around the filament yarn 2. The obtained composite spun yarn 12 is wound by the winder 14 in the form of a cheese 15. The distance between the roller 9 and the point to combine the short fiber fleece 6 with another yarn 2 is preferably <=1.2 times the average fiber length of said fleece 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for efficiently producing a composite spun yarn that has both a textured appearance for a spun yarn and excellent filament joining functionality. Ru.

Conventional technology Conventionally, a composite spun yarn of short m-fibers and long-fiber filaments was produced by using a spinning machine in the spinning process to supply filament yarn to the drafted rovings to compound them, and then twisting them using a ring traveler. A so-called core span technique is known in which the material is wound while being added. However, since this method uses actual twisting, the spinning speed is extremely low (10 to 20% at most).
The winding speed is limited to a low speed of 1 rL/min, and the amount of winding cannot be increased, resulting in a considerably high manufacturing cost.

On the other hand, recently, research and development has been conducted on the no-twist spinning method or bundled spinning method, which has a fundamentally different production principle from the conventional spinning method, and has become possible to produce spun yarn with extremely high efficiency. It's coming. That is, FIG. 1 is a process diagram showing an example, in which 1 is a tow made of continuous fibers, which is passed between a delivery roller 5 and a tension cutting roller 9 that rotates at a higher speed than the delivery roller 5. Stretching/
The short fiber fleece 6 is made by tension cutting and drafting, and then,
A fluid binding nozzle 11 having a swirling action imparts binding properties to the short fiber fleece 6 carried out from the tension cutting roller 9 by a fluid take-up nozzle 10 having a suction action, and the fiber is wound up in a winder 14. It is something.

The present inventors have already provided a new method using this method of producing spun yarn using fluid.

That is, another yarn is supplied to the tension cutting roller 9 under high tension to be composited with the short fiber fleece, and fluid treatment is performed while maintaining the tension state of the yarn supplied by the tension cutting roller. A patent application was made in 1973 to propose a method for manufacturing composite spun yarn.
7-18909.3).

According to this method, a composite spun yarn in which the continuous yarn and the type 5r11 fleece are intertwined very well can be obtained. However, later research showed that when produced using this method for a long time,
It has been found that one of the rubber rollers of the tension cutting roller 9 is easily worn out by the yarn supplied to the tension cutting roller under high tension, resulting in a drawback that tension cutting spots are likely to occur. 80 again
When producing high-grade yarns, such as when producing high-grade yarns with a thread count higher than
It has been found that the nip of the toe becomes uneven, which actually induces stretch marks.

OBJECT OF THE INVENTION An object of the present invention is to improve the low efficiency of the conventional method for producing composite spun yarn as described above. That is, by using the method for producing composite spun yarn using fluid, it is possible to produce composite yarns ranging from large yarn count to high yarn yarn count at high speed and stably for a long period of time, and which also has good texture and appearance. An object of the present invention is to provide a method for manufacturing yarn.

Structure of the Invention That is, the present invention involves cutting a tow or multifilament yarn made of continuous filaments 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. A method for producing a composite spun yarn by forming short fiber fleece and then passing the short fiber fleece through a fluid binding nozzle to impart binding properties between the fibers to form a yarn,
The method for producing a composite spun yarn is characterized in that another yarn is aligned with the staple fiber fleece between the tension cutting roller and the fluid binding nozzle, and then passed through the fluid binding nozzle.

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

FIG. 2 is a process diagram showing one example of the method of the present invention.

1 is made of polyester long fibers with a total denier of 1100
This is a drawn tow with a single filament denier of 0.5 denier, which is transported between a feeding roller 5 and a tension cutting roller that rotates at a high speed of 21 times the surface speed of the feeding roller.
9 to produce short fiber fleece 6 equivalent to 100 count (fine count). 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 is a polyester multifilament yarn having a triangular cross section with a total denier of 50 denier and a single yarn denier of 1.4 denier.A tension adjustment device 3 applies a tension of 3 degrees to the yarn, and a tension roller 9 and a fluid Conjugation nozzle 11
The fluid that passes through the guide 4 and carries out the short fiber fleece 6 equivalent to the number 100 by suction from the tension cutting roller by the fluid take-up nozzle 1o that has a suction action and a whirling action, and then the fluid that has a whirling action. The short fiber fleece 6 is interlaced and wound around the filament yarn 2 through a conjugation nozzle 11, and the composite spun yarn 12 is wound up as a cheese 15 by a winder 14.

That is, when the speed of the take-up roller 13 is made slower than the speed of the tension cutting roller and the conjugation property is imparted by fluid treatment as in Japanese Patent Application No. 57-189093, the tension of the filament yarn is reduced and the resulting composite spun yarn is A barrel of filament yarn
There are problems such as the yarn coming out on the outside of the yarn at υ, winding with short fibers, and weakening the entanglement.

For this reason, the above method has the disadvantage that it is difficult to obtain a composite spun yarn with high electrical conductivity. On the other hand, according to the method of the present invention, even if the speed of the take-up roller 13 is lower than the speed of the tension cutting roller, the tension of the filament yarn does not decrease.
The speed of the take-up roller can be varied over a wide range,
Therefore, it is possible to obtain composite spun yarns of various bulkiness, from those with low bulkiness to those with high bulkiness.

Here, the position where the filament yarn 2 is aligned and fed to the short fiber fleece is important in order to reduce yarn breakage during production. This is a graph showing the occurrence of yarn breakage during manufacturing when the ratio d/fl of the distance (d) between the alignment position of the fiber fleece and the tension cutting roller 9 is changed.

In the drawing, the area to the right of the dotted line is the area where thread breakage occurred frequently. As is clear from this, in order to obtain stable manufacturing conditions with less yarn breakage, the distance between the tension cutting roller 9 and the position where the filament yarns are arranged on the short fiber fleece is determined by adjusting the short [t] supplied from the tension cutting roller 9. Average fiber length of fleece: 1.2
It needs to be less than double.

In other words, compared to the case where the filament yarn is not supplied between the tension cutting roller and the fluid binding nozzle, when the filament yarn is supplied, the twisting by the fluid binding nozzle is plastically applied between the pulling supply point of the filament yarn and the tension cutting roller. As a result, not only does the conjugation property become low, but also if the distance between the pulling supply point of Ficimene 1-system and the tension-cutting roller is longer than 1.2 times the average Ili fiber length of the short fiber fleece, floating fibers This is because the number of threads increases, thread breakage occurs frequently, necks increase, and conjugation becomes uneven. Therefore, it is desirable to place the fluid binding nozzle as close to the tension cutting roller as possible.

In FIG. 3, ◯ indicates a level where the number of thread breaks per spindle per hour is 0.1 or less, and Δ indicates a level of 0.1 to 0.2.

× indicates a level of 0.2 or higher.

- Also, the tension of the filament yarn supplied between the tension cutting roller and the fluid binding nozzle is important for improving the yarn morphology of the resulting composite spun yarn and the binding property between the filament yarn and short fiber fleece. That is, FIG. 4 shows the relationship between the tension (Tg/de) of the supplied filament yarn and the binding property of the obtained composite spun yarn. The part to the left of the dotted line is a range where filaments are significantly exposed in the spun yarn, and the part to the right of the dotted line is a range where yarn breakage occurs frequently during manufacturing. As can be seen from this, in order to obtain a composite spun yarn having good conjugation properties, it is preferable that the tension of the filament yarn to be supplied be between 0.5 g/de and 1.5!7/de. That is, the tension of the filament thread is 0.5 g/d.
If it is lower than e, not only will the filament yarn be more likely to be exposed on the outer periphery of the obtained composite spun yarn, but also the filament yarn and short fiber fleece will be more likely to separate. On the other hand, if the tension of the filament yarn is greater than 1.5 g/de, the filament yarn becomes easy to break, which is not preferable. The conjugation property is an evaluation result by visual observation, where O indicates good, × indicates poor, and Δ indicates an intermediate state.

Here, the tow 1 may be made of continuous filaments. polyester, polyamide, polyacrylonitrile,
Examples include fibers such as aromatic polyamide. The single yarn denier, cross-sectional shape, gloss, etc. may be appropriately selected depending on the purpose. Furthermore, the above-mentioned fibers may be used for the filament yarn 2 as well.

Instead of multifilament yarn, spun yarn (including synthetic fibers or natural fibers) can also be used, and is not particularly 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 thus 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 formed mainly of filament yarn and a sheath formed of short fiber fleece, and has a wide range of intrinsic properties, from high to low, depending on the conjugation treatment conditions using the fluid-containing nozzle. It is possible to change the appearance, texture, etc.

Example 1 A total denier of 9 was applied to tow 1 by the process shown in FIG.
A tow made of polyethylene terephthalate fiber with a single yarn denier of 0.00 denier and a single yarn denier of 0.45 denier is used, and the tow is equivalent to 150 count (fine count) at a stretch cut draft ratio of 26 times at a stretch cut part having a length of 750 mm. Average fiber length of 31
It was cut into a 0 m short fiber fleece. On the other hand, filament 1 and 2 are 50 denier.

A polyethylene terephthalate multifilament yarn having a triangular cross section with a single yarn denier of 1.39 denier was used, a tension of 35 g was applied by the tension adjustment device 3, and the short fiber fleece was pulled and guided at a position 200 mm from the tension cutting roller. Line up through 4 and 270M @C
When passed through a fluid binding nozzle 11 having an interlacing action to impart binding properties, a composite spun yarn in which the core portion is mainly occupied by filament yarns, the sheath portion is mainly occupied by short fiber fleece, and the filament yarns and short fiber fleece are closely intertwined is obtained. 12 were obtained. In addition, when the speed of the tension cutting roller 9 at this time was 200 m/min, the speed of the take-up roller 13 was set to 194 m/min. A composite spun yarn 12 with fine loops and slacks formed on the sides and rich in electrical conductivity was obtained.

Next, using a water jet loom, 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 is used for the warp, and a composite spun yarn according to the present invention is used for the weft. By weaving these, we were able to obtain a fabric with a high-quality appearance and texture that is very similar to that of silk-spun fabric. Also, during weaving, fuzz.

The weavability was very good, with little yarn breakage or fluff.

Comparative Example 1 Using the same equipment and conditions as Example 1 except that the filament yarn 2 was supplied from the upper part of the tension cutting roller 9,
When a composite spun yarn was produced, only a composite spun yarn with yarn unevenness (0%), poor conjugation properties, and poor appearance with filament yarns protruding from the yarn surface in the form of loops was obtained.

Comparison/Example 2 The alignment and supply position 4 of the filament yarn 2 was moved to a position 380 m from the tension cutting roller, and the fluid binding nozzle was also moved to a position 420 m away from the tension cutting roller.
When a composite spun yarn was produced using the same equipment and conditions as in Example 1 except that the yarn was moved to a position of Ta.

Comparative Example 3 Example 1 using the same apparatus J3 and conditions as Example 1, except that the supply tension of filament yarn 2 was lowered to 207
When a composite spun yarn was produced using the same equipment and conditions as in Comparative Example 1, yarn unevenness (0%) was not affected much, but conjugation was only as bad as in Comparative Example 1.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing a conventional twistless spinning method. FIG. 2 is a process diagram showing the method of the present invention, FIG. 3 is a diagram showing the occurrence of yarn breakage with respect to the ratio of the distance between the tension cutting roller nip point and the filament yarn supply point to the average fiber length of short fiber fleece, FIG. 4 is a diagram showing the binding property of the composite spun yarn with respect to the supplied tension of the filament yarn. 1 is drawn tow, 2 is multifilament yarn. 3 is a tension adjustment device, 4 is a thread guide, 5 is a delivery roller, 6 is a short If, l[f fleece, 7 is a thread guide,
8 is a trough-shaped guide, 9 is a tension cutting roller, 10 is a fluid take-up nozzle, 11 is a fluid binding nozzle, 12 is a composite spun yarn, 13
is a take-up roller, and 14 is a winder. 15 is a cheese-like composite spun yarn. Next 1st Next 2) Button

Claims (3)

[Claims] (1) A tow or multificimen 1 made of continuous long fibers is cut 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 a method for producing spun yarn, in which the short fiber fleece is passed through a fluid binding nozzle to impart conjugation properties between the fibers to form a yarn, the short fiber fleece is made into a yarn by cutting the short fiber fleece. A method for producing a composite spun yarn, comprising aligning the short fiber fleece with the short fiber fleece between the tension cutting roller and the fluid binding nozzle and passing the fiber through the fluid binding nozzle. (2) A patent claim in which the distance between the tension cutting roller and the position where another yarn is arranged on the short fiber fleece is 1.2 times or less of the average 11i dark blue length of the short fiber fleece supplied from the tension cutting roller. A method for producing a composite spun yarn according to item (1). (3) The tension of the yarn supplied between the tension cutting roller and the fluid binding nozzle is within the range of 0.5 g/de to 1.5 g/de. ) The method for producing the composite spun yarn described in item 2.