JPH03104958A - Water jet loom weaving method for spun yarn - Google Patents

Abstract

PURPOSE:To accomplish weaving in high operating efficiency with few flaws, through picking in an entirely free flying system, by weaving, using a water jet loom, spun yarn made up of polyester fiber produced by spinning at a winding speed not lower than a specified value. CONSTITUTION:When weaving is to be made with a water jet loom using spun yarn made up of polyester fiber produced by spinning at a winding speed of >=6000m/min, said spun yarn is stored, in advance, at an amount of at least one batch of picking in a weft length measuring storage drum, and its flying is then started and the spun yarn is put to picking in an entirely free flying system capable of flying under low tension, thus avoiding the development of fabric flaws such as stopping marks or filling bands, stemmed from yarn defects.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a water jet loom (hereinafter referred to as WJ) for spun yarn.
(referred to as L).

More specifically, it relates to a WJL weaving method that provides excellent weavability and fabric quality when weaving using spun yarns made of polyester fibers, particularly polyester fibers spun at a speed of 6000 m/min or more, as weft yarns.

[Conventional technology]

Spun yarn fabrics made of polyester fibers spun at a winding speed of 6,000 m/min or more have volume, a soft texture, low heat shrinkage, high dimensional stability, and wrinkle resistance. We can provide fabrics that have the advantage of being difficult to form. In addition, it has the excellent characteristic of being easy to dye, and has the advantage of not impairing the properties of other materials in mixed-woven fabrics.

Shuttle looms, rapier looms, air jet looms, and WJLs are used as weaving means that use the spun yarn as weft yarns. In particular, WJLs are capable of high-speed weaving and can be installed in large numbers, so they reduce weaving costs. It is very effective as a means of reduction.

[Problems to be Solved by the Invention] However, the weavability of WJL using this spun yarn as the weft has a lot of fuzz and yarn defects like conventional spun yarns, making it difficult to achieve stable weft insertion. This resulted in a large number of loom stops, resulting in a significant drop in loom operating efficiency. Therefore, there was a problem in that, despite the increased speed, it was not possible to obtain a sufficient improvement in productivity. Furthermore, in terms of fabric quality, in addition to defects such as stopper steps, there is also a problem in that weft sink marks and through-through defects are likely to occur. There are measures such as increasing the number of spinning fuels to eliminate this weft sink and slippage, but this is undesirable because it reduces the volume and softness, which are the characteristics of the texture of the fabric. Even with weaving technology measures such as making the yarn grip softer, the problem could not be resolved, and a sufficient solution had not yet been found.

The object of the present invention is to obtain polyester fibers, especially at a spinning winding speed of 6
When weaving with WJL using a spun yarn composed of polyester fibers spun at a speed of 000 m/min or more for the weft,
The object of the present invention is to provide a weaving method that solves the above-mentioned problems and has excellent weavability and fabric quality.

The inventors of the present invention have conducted various studies on stable weft insertion measures and solutions for fabric defects such as weft sink and shedding, and as a result, the weft yarns are unwound from the length measurement storage device and included in the water jet jetted from the nozzle. However, at this time, in addition to the poor unwinding properties due to the fluff that is unique to spun yarn, the high tension that is applied during flight affects flight performance. We found that this is a major factor contributing to instability. That is, by applying this high tension, it is not possible to obtain a satisfactory weft insertion, which promotes an increase in the number of loom stops and the occurrence of weft sink defects.

Regarding the point that high tension is applied during this flight, the third point is
This will be explained using figures. FIG. 3 shows an example of the tension transition of a weft thread during flight using a length measuring and storage device for the second drum. This tension was continuously detected by installing a known tension detector (8) in front of the injection nozzle (11) on the weft yarn (9) unwound from the measurement storage device as shown in Figure 4. It is something.

In FIG. 3, the weft yarn starts flying at a loom crank angle θ1 and ends at a loom crank angle θ3. Incidentally, θ4 is the crank angle at the time of beating the reed. Here, the drum-type length measuring and storing device has a mechanism that measures the length of the next weft insertion at a constant rotation speed and simultaneously winds and stores the length, so that even when the weft insertion is finished, the length of the next weft insertion is continuously measured. We have started storing the inserted amount. However, the entire weft length for one weft insertion is not wound on the drum and stored in advance, but only a part of the weft length required for one weft insertion is wound and stored on the drum in advance. . The remaining short length is fed by the measuring roller and is simultaneously flown. In FIG. 3, the crank angle between θ1 and θ2 is newly stored before the start of flight and during flight. Therefore, this part is a flying area where the unwinding tension is low, where the weft yarn flies depending on the speed of the jetted water flow, and is a so-called "free flying area." On the other hand, between the crank angles θ2 and θ3, the weft yarn is fed by the length measuring roller and simultaneously runs in the portion corresponding to the shortened length. This part is called the "restricted flight area", and at θ2 at the start of this restricted flight, the flight tension is 5
~20 times higher flight tension is suddenly applied.

In other words, it is as if a sudden brake is applied to the weft yarn flying. The application of such high tension strongly stretches the spinning system, promotes the occurrence of weft sink defects, and is a major factor contributing to unstable flight performance.

In order to eliminate this restricted flight range and keep the flight tension of the weft low and uniform, the present inventors have made extensive studies and have arrived at the present invention.

[Means to solve the problem]

That is, the present invention is characterized in that when weaving a spinning system made of polyester fibers spun at a winding speed of 6,000 m/min or more using WJL, the weft insertion of the yarn is carried out in a completely free flight method. This is a weaving method.

This invention. For example, in the apparatus shown in FIG. It means the speed at which it is picked up. In FIG. 1, (1) is a yarn, (2) is a spinning head, (3) is a tubular heating device, (4) is a fluid suction device, (5) is an oil application device, (6) is a convergence device, (7) shows the take-up roll.

The spun yarn used in the present invention is composed of polyester fibers, and may contain additives normally used for polyester, such as matting agents, stabilizers, ultraviolet absorbers, antistatic agents, etc. Further, there is no particular restriction on the degree of polymerization as long as it is within the range of ordinary fiber shapes. Further, copolymers with small amounts of other components may also be used within a range that does not impair the purpose of the present invention.

The denier, fiber length, spinning method, etc. of the thick cotton for the spun yarn used in the present invention are not particularly limited, and may be appropriately selected within the range used for ordinary polyester spun yarns.

Further, the blending rate may be 100% polyester spun yarn, or may be a blended yarn with wool, silk, cotton, linen, acrylic, rayon, etc., and the blending rate is preferably 30 to 70%.

In the present invention, the completely free flying system means that the weft yarn flies with a relatively constant low tension from the time it starts flying until it ends. An example of tension transition is shown. During the period from θ1 when flying starts to θ3 when the weft gripper closes and ends flying, the weft thread always flies with a constant low tension without any particularly high tension being applied. This can be achieved by installing in advance a weft length measuring and storage device having a mechanism for storing weft yarns with a weft insertion length of 1 or more in the drum storage section before the weft yarns start flying.

This length measuring storage device has a mechanism for regulating the length of one weft yarn unwound from the drum storage section using a photoelectric sensor or the like. In addition, this drum storage section stores 1 to 2 excess weft yarns, and
In order to prevent excessive tension from being applied during unwinding, that is, when the weft yarns fly, it is preferable to wind the yarns separately so that adjacent systems do not come into contact with each other or overlap each other on the drum.

Other weft length measurement and storage methods include an in-pipe storage method using air suction or air injection. Although it is mechanically possible to achieve completely free flying using this method with some modification, the yarn may become clogged with the fluff of the spun yarn inside the pipe, making it difficult to unwind from inside the vibrator. It is preferable to adopt the drum storage method.

It is suitable to weave at a loom rotation speed of 300 to 600 rpm. If the speed is below 300 rpm, the productivity of the woven fabric will be low, and if the speed is above 600 rpm, the flying properties of the weft yarns will tend to deteriorate.

〔Example〕

Next, the present invention will be explained by examples.

Example 1.2 and Comparative Example 1 Polyethylene terephthalate was wound up at 6000 m/min and 8000 m/min using the apparatus shown in FIG.
Yarns of 75d/36f were obtained respectively. Based on the obtained yarn, a stable of unequal length fibers of about 2 d and 76 to 102 M was manufactured. These stables were separately worsted-spun using a conventional method to obtain spun yarns each having a count of 48 twin yarns. Using these two types of spun yarn, the warp density is 55/inch and the weft density is 4.
Weaving was carried out using a WJL with a loom rotation speed of 400 rpm using a 5/inch flat structure. At this time, the spinning winding speed was 6000 m.
The spun yarn constructed with yarns of 1/2 minutes has two types of weft flying methods: the conventional combined method of free flying and restrained flying, and the completely free flying method, and the spinning winding speed is 8000 m. The spun yarn composed of yarns of /min was made using a completely free running method.

Table 1 shows the results of the number of times the loom weft was stopped and the presence or absence of weft sink and skipping for each case.

As is clear from Table F, the number of times the loom stops can be reduced compared to the conventional method by adopting the completely free flight method for spun yarns composed of yarns with a winding speed of 6000 m/min or more. This reduces the weaving step defects, and furthermore,
It is also possible to eliminate weft sink marks and imperfections. Table 1 [Effects of the Invention] By using the weaving method of the present invention, it is possible to obtain a woven fabric that has a high wt machine operating rate, has few fabric defects, and has an excellent texture.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the fiber spinning process used in the method of the present invention. FIG. 2 is a graph showing the relationship between the loom crank angle and the weft tension in the present invention. FIG. 3 is a graph showing the relationship between the loom crank angle and the weft tension in a conventional combined method of free running and restricted running. FIG. 4 is a sketch for explaining the method of measuring weft tension shown in FIGS. 2 and 3. FIG. 1.- Yarn, 21. Spinning head, 3. Tubular heating area, 4.
- Fluid suction device, 5- Oil application device, 6- Focusing device,
7..1 take-up roll, 8.1 weft tension detector, 9. weft from the weft length measuring and storage device, 10..- weft gripping device, 11
...-Injection nozzle, 12...-Guide, θ1 Loom crank angle at the start of one weft flight, θ2 Loom crank angle at the start of one restrained flight, θ, Loom crank angle at the end of one weft flight,
θ4 - Loom crank angle during beating. Fig. 2 3rM Reikuo Special Group “ShikukufA(”1) Fig. 4

Claims (1)

[Claims] 1. Weaving characterized in that when weaving a spun yarn made of polyester fibers spun at a winding speed of 6,000 m/min or more in a water jet loom, the weft insertion of the yarn is carried out in a completely free flight method. Method.