JP4677786B2 - Elastic composite yarn with excellent convergence - Google Patents

Description

  The present invention relates to a composite elastic yarn that can provide a fabric of excellent quality without peeling or abnormal gloss, and more particularly to a composite elastic yarn in which the elastic fibers contained in the composite elastic yarn are two or more multifilaments.

  Conventionally, the demand for stretchable fabrics has increased from the viewpoint of aesthetics and functionality, and elastic fibers such as polyurethane have been frequently used. In general, elastic fibers are hard to be dyed and difficult to impart design, natural friction is high in terms of high friction, tactile improvement, ensuring processability in the fabric-making process, and ensuring economic efficiency according to the purpose. In general, it is used in combination with inelastic yarns of synthetic fibers. The elastic yarn is used as a bear yarn and may be knitted and woven with the inelastic yarn, but it is most often used as a composite yarn with the inelastic yarn having excellent handleability.

  A typical composite yarn includes a core-sheath type composite yarn (hereinafter referred to as a seascore yarn) with an inelastic single fiber and a core-sheath type composite yarn (hereinafter referred to as a covered yarn) with an inelastic filament yarn. Elastic fibers, such as polyurethane, have extremely low bending modulus compared to other fibers, so they are often used as monofilaments in clothing applications. From the viewpoints of shape uniformity, physical property uniformity, and convergence, the viewpoint of composite yarn It can be said that it is an ideal use shape. However, there are restrictions on the production, for example, the maximum fineness that can be produced from the cooling rate in the case of melt spinning and the solvent evaporation rate in the case of dry spinning. A typical production example is a dry polyurethane fiber. From the viewpoint of the solvent evaporation rate described above, the upper limit of the single yarn fineness is 3 to 10 dTex, and a multifilament is essential for a yarn of 20 to 156 dTex generally used. is there. However, in order to avoid defects in the filaments from previous experience (for example, poor convergence of the filament during the process or single yarn breakage during the process), the fibers are converged by false twisting during the spinning process and welded to form a pseudo monofilament. Used (see, for example, Patent Document 1).

At this time, depending on the convergence state of 3 to 5 filaments, close packing or flat convergence occurs, and the portion in this flat convergence state causes gloss abnormalities and unsealing of seascore yarn, thereby degrading the quality. The false twisting condition is said to be the most important processing know-how. Thus, although it is ideal to use with a monofilament, there is a high-definition region that cannot be multi-purposed. As means for solving these problems, there has been proposed a method in which a plurality of elastic yarns made into pseudo monofilaments are further arranged in a process of processing a processed yarn and a multifilament elastic yarn is supplied as a core yarn. (For example, refer to Patent Document 1). However, these multi-yarns are not bonded to each other, the honey-filled state partially collapses due to the knitting process and deformation during wearing, and the effect of preventing flat convergence due to multi-izing is not sufficient, However, there is a problem that the single yarn fiber is exposed to the fabric surface when the fiber is cut or stretched, and the aesthetic properties of the fabric are easily impaired. In addition, since the required fineness varies depending on the application, it is currently being produced with many issues in terms of productivity, economy, inventory management, etc.
JP 2002-275738 A

  The present invention has been made against the background of the problems of the prior art, and prevents deterioration of the quality of the composite yarn and the fabric using the multifilament of the elastic yarn. It is an object to prevent a reduction in consumption performance.

As a result of intensive studies to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention
1. It is a composite yarn composed of a multifilament cross-linked polyolefin elastic yarn having two or more filaments in the core and an inelastic yarn in the sheath, and is an elastic composite yarn satisfying the following formula (1).
T · F · √ (d / 1.1) × 10 ⁻⁵ ≧ 0.2 (1)
Here, T is the number of twists or number of windings of the composite yarn (T / m)
F is the number of inelastic fibers (in the case of filament yarn, the number of filaments)
d represents the single yarn fineness (dtex) of the inelastic fiber.
2. 1. The core yarn after wet heat or dry heat treatment is substantially adhered, and the adhesive force between the filaments is 1 g or more. The elastic composite yarn according to
3. 1. The total fineness of the core yarn is 110 dtex or more Or 2. The elastic composite yarn described.

  The elastic composite yarn of the present invention is an elastic composite yarn that exhibits the same uniformity and durability as a monofilament, even though the core elastic yarn is a multifilament yarn, ensuring the aesthetics of the fabric, and a small number. The brand has the advantage of being able to handle a wide range of applications.

Hereinafter, the present invention will be described in detail.
The elastic composite yarn according to the present invention preferably uses a cross-linked polyolefin fiber. This is because when the crosslinked polyolefin is heated, it hardly adheres to the non-elastic fibers, and the crosslinked polyolefin fibers can strongly adhere to each other while maintaining the fiber form. That is, in the composite yarn, the elastic yarn is highly converged due to strong restraint by the inelastic yarn. In this way, it is possible to fix a plurality of elastic yarns in a highly converged state, that is, to form a monofilament, which is excellent in aesthetics, prevents the single yarn from being exposed on the fabric surface, and has a large stretch force. Can be obtained.

  The cross-linked polyolefin fiber referred to in the present invention is preferably a fiber that is uniformly branched and that is obtained by subjecting a substantially linear olefin to a cross-linking treatment. If such a cross-linked polyolefin elastic fiber is used, the polyolefin elastic fibers easily adhere to each other at a relatively low temperature (about 50 to 60 ° C.) without adversely affecting non-elastic fibers, and do not peel off by repeated expansion and contraction at the time of wearing. There is.

  The adhesive force between the elastic fibers is preferably 1 g or more. If it is less than 1 g, partial peeling occurs during repeated stretching in practical use, making it difficult to achieve the object. The greater the adhesive strength, the better. Ideally, it is preferable that the separation is impossible. This characteristic is a characteristic of only a cross-linked polyolefin elastic fiber having a low crystal melting point, and cannot be achieved by a polyurethane-based or polyether ester-based elastic yarn. When multiple elastic fibers in the composite yarn are in a non-adhesive state, the individual fibers can move freely, and the finely packed state formed at the time of manufacturing the composite yarn is partially used during cloth making, dyeing finishing process, sewing, and wearing. However, there is a defect that appearance abnormality is likely to occur. Moreover, in these processes, it is easy to be drawn on the surface of the fabric due to single yarn breakage or scratching, which is not preferable. Further, the cross-sectional shape of these elastic fibers is preferably a circle, a triangle, a flat shape, etc., in which the fiber surfaces are easily in contact with each other.

  Here, the olefin fiber which is uniformly branched and is substantially linear refers to a polymer obtained by polymerizing an olefin monomer, and the degree of branching of the polymer is uniform. For example, low-density polyethylene copolymerized with α-olefin and elastic fiber described in JP-A-8-509530 correspond to this. Examples of the crosslinking method include chemical crosslinking using a radical initiator, a coupling agent, and the like, and a method of crosslinking by irradiating energy rays. In consideration of stability after becoming a product, crosslinking by irradiation with energy rays is preferable, but the present invention is not limited to these methods.

  The composite yarn of the present invention preferably uses a cross-linked polyolefin fiber for the core, a composite spun yarn using a short fiber such as cotton for the sheath, and a polyester or polyamide filament yarn or a bulky processed yarn for the sheath. Broadly divided into covering yarns. If necessary, the core-sheath material can be reversed.

In order to realize the above-mentioned adhesion state, the structure of the sheath yarn surrounding the core yarn is conventional, and specifically, it is preferable to satisfy the expression (1).
T · F · √ (d / 1.1) × 10 ⁻⁵ ≧ 0.2 (1)
Here, T is the number of twists or number of windings of the composite yarn (T / m)
F is the number of inelastic fibers (in the case of filament yarn, the number of filaments)
d represents the single yarn fineness (dtex) of the inelastic fiber.
The left term of the formula (1) (hereinafter referred to as the coverage) shows the coverage in a virtual state in which all the sheath fibers are wound around the core thread in parallel with one layer. This means that the restraining force is also increased, and it means that the aesthetics are improved by concomitantly stabilizing the covering state and improving the convergence of the elastic yarn in the composite yarn.

  When the coverage is less than 0.2, the adhesive force between the multi elastic filaments of the core becomes low, and it becomes difficult to secure 1 g of adhesive force. Preferably it is 0.3 or more, More preferably, it is 1.0 or more. The upper limit is infinite from the viewpoint of adhesiveness and aesthetics, but 1.2 should be the upper limit in order to maintain the stretchability of the elastic yarn.

  A plurality of elastic yarns supplied at the time of composite yarn production can be supplied as yarns wound as multifilaments at the time of spinning, or a plurality of yarns wound up as monofilaments at the time of spinning can be supplied to a machine for producing a plurality of composite yarns. .

  In addition, the convergence state at the time of adhesion is also an important factor, and it is preferable that the shape be close to the closest packing. For this reason, a two-ply yarn form in which the converging state is flat is not preferable, but when the elastic yarn ratio in the composite yarn is less than 10%, the binding is caused by the binding force of the sheath fiber, and the cross section is deformed into an elliptical shape. It is not a big problem. More preferably, 3 or more yarns are preferred particularly when the elastic yarn ratio is 10% or more. However, if the number of sticking elastic fibers is 10 or more, the average single yarn fineness described later becomes too thin, which causes a trouble in the manufacturing process of the composite yarn.

  The average single yarn fineness of the elastic fiber in the composite yarn is preferably 10 dtex or more and 200 dtex or less. If it is less than 10 dtex, it will be difficult to check the yarn path and make it easy to find the end of the yarn during spinning and composite yarn production because it is thin. Deteriorate. On the other hand, if it exceeds 200 dtex, due to the cooling rate, it becomes necessary to lengthen the cooling zone and the equipment needs to be expanded, and the difference in physical properties between the fiber center and the outer periphery increases, and the physical properties such as strength as a whole of the fiber. descend. Taking these into account, the total fineness of the core yarn is preferably 110 dtex or more, and 1100 dtex or less is practical. If it is less than 110 dtex, there are few merits to multiplex, there are few differences with a monofilament, and conversely, demerits in handling etc. will be derived by multiplex.

  The composite yarn of the present invention is a composite yarn of a thermoplastic synthetic fiber or natural fiber, which is a non-elastic fiber, and a crosslinked polyolefin elastic fiber, and the composite form is mutually different from that in which the non-elastic fiber covers the elastic fiber. There is a twisted form, and it is selected according to the purpose. In particular, when used for apparel, non-elastic fibers often cover elastic fibers. The inelastic yarn may be a short fiber bundle or a long fiber bundle.

  Hereinafter, although it explains in full detail using an Example, embodiment is not limited.

[Measurement method of adhesive strength]
The composite yarn is sampled 10 cm, the sheath fiber is carefully removed so as not to stretch as much as possible, and the core elastic yarn is taken out. While observing one end of the elastic yarn with a microscope, the filament bonded with the needle and tweezers is divided into half lengths (5 cm) of the sample. This split part is attached to a 10cm tensilon with a gauge length of 3cm so that the initial load is 0.001g / d of total fineness and the end of the split is almost centered. However, the stress is recorded on a chart paper having a total fineness strength or higher, and the average value of the five highest stress points is defined as the adhesive strength. At this time, if the sample cannot be separated or the sample of 10 cm is not completely separated and is cut halfway, the breaking strength of the sample of the total fineness is measured, and the value divided by the number of filaments of the elastic yarn is taken as the adhesive strength. .

Example 1
Polyester flat yarn (flatness = 4.8) 55 dtex36 filament yarn covered in 1000 S / m in the S direction while drafting 3 times of the three aligned yarns of 156 dtex of cross-linked polyolefin elastic yarn. Rolled up and set at 85 ° C. for 15 minutes. The coverage of the yarn (T · F · √ (d / 1.1) × 10 ⁻⁵ ) was 0.42.
Weaving this composite yarn as weft, polyester false twisted yarn 165dtex double yarn as a warp yarn, weaving with a texture pattern, scouring in the usual way, after setting, dyeing, setting, finishing by 5% weight reduction I got a cloth. The constant load elongation rate in the weft direction of this fabric was 28%, and the recovery rate was 90.2%, indicating excellent stretchability. Moreover, there was no irritation on the fabric surface and it had a uniform appearance. The weft was extracted from the fabric and the adhesive strength of the elastic yarn was measured. The result was 130 g (determined from the strength of the yarn because it was not separable). The shape was also close to a circle, although three shallow recesses were seen.

(Example 2)
A rough yarn made of cotton fibers having an average fiber length of 26 mm is drafted 48 times between the front roller and the back roller, and at the same time, four monofilaments of cross-linked polyolefin fiber 78 dtex are aligned and drafted 4.0 times to the front roller. The resultant was wound around a fine spinning cup under a tension of 70 g with a twist coefficient of 3.2, and a 12-cotton core-sheath type composite spun yarn was obtained. The mixing ratio of the crosslinked polyolefin fiber was 15.8%, and the coverage (T · F · √ (d / 1.1) × 10 ⁻⁵ ) was 1.35. The spun yarn was set for 15 minutes at 70 ° C. The composite spun yarn was used as a weft and a warp-dyed cotton yarn with slab 16 was used to obtain a denim fabric, which was processed in the usual manner. The constant load elongation rate in the weft direction of the fabric was 12%, and the recovery rate was 85.2%, indicating excellent stretchability. Moreover, there was no irritation on the fabric surface and it had a uniform appearance. The weft was extracted from the fabric and the adhesive strength of the elastic yarn was measured. The result was 65 g (determined from the strength of the yarn because it was not separable). The shape was almost as close to a circle as possible although four shallow recesses were seen.

(Example 3)
Nylon 6 filament 77 dtex 24 filament was wound in the S direction at 800 T / m while drafting 2 cross-linked polyolefin-based elastic yarn 22 dtex two-fold drawing to obtain a covering yarn. The mixture ratio of the crosslinked polyolefin fiber was 14.8%, and the coverage (T · F · √ (d / 1.1) × 10 ⁻⁵ ) was 0.33. Tights were made with a Santoni circular knitting machine by alternating the yarn and nylon 6 false twisted yarn. The product was prepared by scouring, dyeing, and setting in a conventional manner, but the constant load elongation rate in the warp direction of the same knitted fabric was 48%, and the recovery rate was 80.4%. Moreover, there was no irritation on the fabric surface and it had a uniform appearance. When the knitted fabric was cut and knitted to take out the composite yarn and the adhesive strength of the elastic yarn was measured, it was 48 g, which was almost integrated.

(Comparative Example 1)
Nylon 6 filament yarn 22 dtex 6 filament yarn is covered at 1000 T / m in the S direction while drafting a three-ply cross-linked polyolefin elastic yarn 156 dtex three times, and wound up in a stretched state as a composite yarn for 15 minutes at 85 ° C. I set the key. The coverage (T · F · √ (d / 1.1) × 10 ⁻⁵ ) of the yarn was 0.11. The composite yarn was used as a weft, a nylon 6 false twisted yarn of 155 dtex was used as a warp, and weaved with a texture pattern. After scouring, setting, and setting, a finished fabric was obtained. The constant load elongation rate in the weft direction of this fabric was 31%, and the recovery rate was 92.2%, indicating excellent stretchability. The weft was extracted from the fabric and the adhesive strength of the elastic yarn was measured to be 0.5 g, but the large fabric was not adhered. When the surface of the cloth was observed, an abnormally glossy spot that was partially glaring was observed. When the portion was magnified 50 times with an electron microscope, the filament was partially broken and the filaments were arranged in a flat shape.

  The yarn of the present invention is a composite elastic yarn with a multifilament elastic yarn that has a uniform appearance, similar to a composite elastic yarn with a monofilament as the core, and can increase the fineness of the elastic yarn without impairing the uniformity. In addition, it is a composite elastic yarn that also has the potential to reduce the brand of elastic filament yarn, and can supply composite yarns with large fineness that are highly demanded for industrial materials.

Claims (2)

A composite yarn composed of a cross-linked polyolefin elastic yarn having a multifilament of 2 filaments or more in the core and a total fineness of 110 dtex or more and an inelastic yarn in the sheath, satisfying the following formula (1), wet heat or dry heat treatment An elastic composite yarn characterized in that a subsequent core yarn is substantially adhered.

T · F · √ (d / 1.1) × 10 ⁻⁵ ≧ 0.2 (1)
Here, T is the number of twists or number of windings of the composite yarn (T / m)
F is the number of inelastic fibers (in the case of filament yarn, the number of filaments)
d represents the single yarn fineness (dtex) of the inelastic fiber. The elastic composite yarn according to claim 1, wherein the adhesive strength between the cross-linked polyolefin fibers is 1 g or more.