JP3010674B2 - Antistatic composite yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an antistatic composite yarn, and more particularly, to a mixed yarn of a conductive filament yarn and a nonconductive multifilament yarn having a core portion and a nonconductive yarn. The present invention relates to an antistatic composite yarn in which a conductive staple is present in a sheath portion.

(Prior Art) It is generally known that both synthetic fibers and natural fibers are charged by friction. In particular, the triboelectric charging of synthetic fibers is awkward, and is remarkable in winter when the humidity is low and causes various kinds of static electricity damage. It is known that, in order to improve such a problem, an antistatic property is conventionally imparted by mixing a conductive fiber or the like with a fiber material. As a specific method, in the case where the conductive fiber is simply blended with the non-conductive fiber and used, the conductive fiber is exposed on the yarn surface, impairs aesthetics, and the conductive fiber is applied to the surface layer of the yarn. There is a drawback that the feel is bad due to the location, and that the durability of the antistatic performance is reduced.

As a method of improving such a defect, a conductive fiber composed of short fibers and a non-conductive fiber as a core and the outer periphery of the short fibers surrounded by a non-conductive fiber (Japanese Patent Publication No. 61-9412),
Further, a conductive yarn having a core as a core and a non-conductive short fiber as a sheath (Japanese Patent Publication No. 61-42012) is known. However, even in these methods, the core portion is easily exposed because the core portion and the sheath portion are easily displaced, and not only the aesthetics are impaired, but also when the fabric using the yarn is dyed and finished, the color hue unevenness (so-called eyes ). Further, the strength of the yarn is liable to decrease with the exposure as described above, and there is a serious problem such as yarn breakage during weaving.

(Problems to be Solved by the Invention) The present invention provides an antistatic composite which is rich in esthetics, does not cause color spots in dyed products, and has good weaving properties, while maintaining high antistatic performance in order to solve the above problems. It provides yarn.

(Means for Solving the Problems) Means for solving the above problems, that is, the present invention is a composite yarn having a core portion and a sheath portion formed therein, and a conductive filament (long fiber) yarn and a non-conductive multi-filament. Filament (long fiber)
A non-twisted mixed fiber consisting of yarn forms a core, and a non-conductive staple (short fiber) surrounds the core to form a sheath, and the core and the sheath are integrally formed. The non-conductive staple accounts for 50 to 90% by weight of the entire composite yarn, and is twisted with a twist coefficient (inch method) of 1.5 to 5, which is an antistatic composite yarn.

The conductive filament yarn in the present invention may be any semiconductor yarn having an electric resistivity of 10 ⁹ Ω · cm or less and any filament yarn in a good conductor region. Specifically, for example, carbon fibers such as carbon fibers and graphite fibers as well as metal fibers such as stainless steel fibers and aluminum fibers, and conductive fine particles (metals, metal oxides, carbon black, etc.) are partially embedded in the synthetic fibers. Or a so-called core-sheath type conductive filament yarn dispersed or uniformly dispersed in the core, or metal on the surface of the synthetic fiber,
Examples include conductive fibers coated with metal oxides, carbon black, and the like. The conductive filament yarn of the present invention may be a monofilament or a multifilament, and is not particularly limited, but is preferably selected in consideration of the linear density when blending by the interlacing method described later.

The filament yarn may be used in a single component or a plurality of components, or a mixture of these components may be used, and the present invention is not limited thereto.

Examples of the other non-conductive multifilament yarn constituting the core of the present invention include synthetic fibers such as nylon, polyester, acrylic and polyolefin, and semi-synthetic fibers such as rayon and acetate. The number of filaments constituting the non-conductive multifilament yarn is 5
~ 50 are preferred.

If the number of filaments constituting the non-conductive multifilament yarn is less than 5, it is difficult to obtain uniformity of the mixed fibers in the yarn length direction, and if it exceeds 50, loops and the like are liable to occur, which is not preferable.

In particular, the number of filaments is preferably 10 to 30 for conventional clothing yarns.

The conductive filament yarn and the non-conductive multifilament yarn are mixed and exist at the core of the antistatic composite yarn of the present invention. Non-conductive staples are present as sheaths surrounding the core.

The non-conductive staple used in the present invention is made of a natural fiber, a synthetic fiber, or a blend thereof. The raw cotton for spun yarn is shown, and the fineness of the raw cotton, the fiber length, etc. may be any as long as the restrictions of the machine used for the production allow. The non-conductive staple of the sheath surrounds the outer layer of the mixed fiber of the core, and further, the core and the sheath are united to form a twist coefficient (inch method) of 1.5 to 5.0.
It must be twisted. If the number of twists is less than 1.5, the covering properties of the core-sheath portion will be insufficient and the conjugation force will decrease.If the number of twists exceeds 5.0, the conjugation force will improve, but on the other hand, the physical properties of the composite yarn will decrease and the texture will be hardened, It is not preferable because the application for use is limited.

The range of the twist coefficient (inch system) which is particularly preferable from the physical properties, hand and appearance of the composite yarn is 2.0 to 4.5. Furthermore, in the present invention, the non-conductive staple is 50 to 50 in the antistatic composite yarn.
It needs to account for 90% by weight. If the non-conductive staples are less than 50% by weight, the hue of the core is conspicuous and the appearance is deteriorated. If the content exceeds 90% by weight, the effect of the antistatic property decreases, which is not preferable. Performance as antistatic composite yarn (antistatic),
The preferable range of the non-conductive staple which becomes the sheath from the viewpoint of physical properties, hue and appearance is 60 to 85% by weight.

Here, the method for producing the antistatic composite yarn of the present invention will be briefly described.

First, the conductive filament yarn and the non-conductive multifilament yarn are interlaced (Japanese Patent Publication No. 36-12230,
The fibers are mixed according to Japanese Patent Publication No. 37-1175). As a method for producing the mixed yarn, there is also an electric mixing method. However, since a high voltage of 1000 to 5000 volts is applied, problems such as generation of sparks in the conductive filament yarn are likely to occur, and the interlace method is preferable.

In addition, the interlace method can solve the above-mentioned problem because the fibers are uniformly mixed by using the aerodynamic force as described below, and the productivity is high.

The interlacing method creates two or more turbulent turbulence zones almost parallel to the yarn axis, guides the filament yarns in this zone, and applies tension so that loops and crimps do not occur to produce a tight non-bulky yarn. Technology. Of particular interest in interlacing are overfeed ratio, tension, fluid pressure and denier, and number of filaments.

Since the conductive fiber generally has a higher density and modulus than non-conductive multifilaments, it is important to set the overfeed rate to be slightly higher, preferably 1 to 5%.

It is preferable that the uniform fiber mixing make the linear density of each component in the turbulent flow region as close as possible.

As described above, according to the present invention, the mixed yarn composed of the conductive filament yarn and the non-conductive filament yarn is located at the core of the antistatic composite yarn, and the core is covered with non-conductive staples. An antistatic composite yarn is obtained, and this yarn provides a product excellent in appearance with excellent physical properties and weaving properties. Further, the fabric using the antistatic composite yarn could impart not only the antistatic property but also excellent characteristics without color hue unevenness after dyeing.

(Example) Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the examples. In addition, each characteristic in an Example was measured by the method shown below.

Triboelectric charge: 20 ° C, 3 according to JIS L1094 1980
The charge amount (μC / m ² ) of the cloth at 0% RH was measured. Nylon and acrylic knitted fabrics were used for the friction cloth.

Hue spots on dyed fabric: The dyeing difference between the base fabric of the dyed fabric and the antistatic composite yarn was visually determined.

Hugging force: The number of times to breakage was measured using an tying force tester according to JIS-L1078. The load applied to one of the measurement yarns was 70 g, the rotation speed of the friction disk was 80 rpm, and the number of rotations of the friction disk until the yarn applied to the friction disk was completely cut was defined as the embracing force.

Example 1 A conductive filament yarn (24 denier 4 filaments) and a polyester multifilament yarn (30 denier 15 filaments) in which a composition containing carbon black as a main component was present in a core portion and nylon 6 was disposed in a sheath portion were used. Mixed yarns were produced with interlaced nozzles with open pairs of fluid conduits (4 locations). The mixed yarn was used as a core, a nonconductive staple made of polyester / cotton (40/60) was used as a sheath, and a twist coefficient was set to 3.5 to obtain a 20th-count antistatic composite yarn. The ratio of non-conductive staples in the composite yarn is
It was 80% by weight.

Example 2 A mixed fiber was obtained from the conductive filament yarn (24 denier 4 filaments) and the polyester multifilament yarn (75 denier 24 filaments) shown in Example 1 using an interlace nozzle. The non-conductive staple as in Example 1 was used as the sheath (63% by weight) with the mixed fiber as the core, and the twist coefficient was 3.
As No. 20, an antistatic composite yarn of 20th was obtained.

Example 3 As a conductive filament yarn, a core-sheath yarn (20 denier / 1 filament) having a core made of a low melting point alloy and a polyester sheath was used, and a polyester multifilament yarn (30 denier 18 filaments) was mixed with an interlace nozzle. did. The blended yarn was used as the core, and the same nonconductive staple as in Example 1 was used at 81% by weight as the sheath to obtain a 20th-count antistatic composite yarn having a twist coefficient of 3.5.

Comparative Example 1 Using the twisted yarn (twist number 300 T / m) composed of the conductive filament yarn (24 denier 4 filaments) and polyester filament (30 denier 15 filaments) shown in Example 1, the twist coefficient of the core-sheath portion is set to 1. Except for the above, an antistatic composite yarn of No. 20 was obtained in the same manner as in Example 1.

Comparative Examples 2 and 3 A mixed fiber of a core was obtained by the same method as that shown in Example 1,
By changing the weight% of the non-conductive staples in the sheath, a 20th-count antistatic composite yarn was obtained.

Table 1 shows the constituent conditions of the antistatic composite yarn, and Table 2 shows the binding strength of the composite yarn and the characteristics of the dyed fabric. The fabric was woven in a plain weave structure with antistatic composite yarn at the end yarn at a rate of 1 yarn / inch according to a conventional method.

As shown in Table 2, the antistatic composite yarn obtained according to the present invention was excellent in embracing power and free of fluff and yarn breakage during weaving. In addition, the dyed fabric was extremely good with no hue unevenness as well as the performance. On the other hand, the composite yarn shown in the comparative example has a small tying force, so that troubles during weaving occur frequently and the antistatic property is satisfied in the dyed fabric, but the hue unevenness is poor and it cannot be put to practical use.

Comparative Example 4 A composition composed mainly of carbon / black (40/60) made of a conductive filament yarn (24 denier 4 filaments) having a sheath composed of nylon 6 and a core made of a conductive filament yarn having carbon 6 as a main component. Using a conductive staple for the sheath portion, a twist control coefficient of 3.5 was used to obtain a 20th antistatic composite yarn. The ratio of non-conductive staples in the composite yarn is 91
% By weight. The yarn had many exposed portions of the conductive filament, and the product had poor aesthetics. In addition, the conductive fibers are often exposed due to yarn breakage and abrasion in subsequent steps such as weaving and knitting, and there is a problem in operability.

Comparative Example 5 A sliver having a weight ratio of 10/40/50 of a conductive fiber made of short fibers and a non-conductive staple made of polyester and cotton was spun, and a spun yarn of 160 geren / 15 yards was spun. did. Using this, a twisting coefficient of 3.5 was obtained to obtain a 20th antistatic yarn. The resulting yarn had a large amount of conductive fibers on the surface, resulting in poor aesthetics of the product.

(Effect of the Invention) As described above, the antistatic composite yarn according to the present invention is a fabric material which is extremely excellent in workability, performance, and appearance, and is applicable to antistatic work clothes, dust-free clothes, and the like.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-90348 (JP, A) JP-B-61-9412 (JP, B2) JP-B-61-42012 (JP, B2) (58) Survey Field (Int.Cl. ⁷ , DB name) F-term theme code 4L036

Claims (1)

(57) [Claims] A non-twisted mixed yarn comprising a conductive filament (long fiber) yarn and a non-conductive multifilament (long fiber) yarn is a composite yarn having a core portion and a sheath portion. A non-conductive staple (short fiber) surrounds the core to form a sheath, and the core and the sheath are integrally twisted at a twist coefficient (inch method) of 1.5 to 5. Wherein the non-conductive staple accounts for 50 to 90% by weight of the entire composite yarn.