JP2023143196A - Composite yarn and manufacturing method thereof - Google Patents

Abstract

To provide a method to manufacture a composite yarn, which has high productivity due to unnecessity of covering step after winding up a crimped yarn, is practical in terms of equipment, cost and the like, and generates less fuzz dust, and enables false twisting of a raw yarn and winding of the raw yarn around a core yarn on the same machine.SOLUTION: A composite yarn is formed by mixing one string of a false-twist textured yarn constituted from a multifilament yarn formed only of organic fibers (however, not include an elastic yarn), one string of false-twist textured yarn having twisting in opposite direction to the false-twist textured yarn, and an elastic yarn or a metal fibers on the same machine. A method to manufacture the composite yarn includes a false twisting step to obtain two strings of false-twist textured yarns having twisting in different directions by applying a false twisting including a heat setting step to the multifilament yarn formed only of organic fibers and a mixing step to mix the one string of false-twist textured yarn, one string of false-twist textured yarn having twisting in opposite direction thereto, and the elastic yarn or the metal fibers, and allows the false twisting step and the mixing step to be continuously conducted on the same machine.SELECTED DRAWING: Figure 1

Description

The present invention relates to a composite yarn and a method for manufacturing the same.

Work clothes and gloves play the role of protecting workers' bodies from various risks such as flames, heat, knives, and nails. Protective materials such as gloves that use high-performance organic fibers such as aramid fibers are resistant to being cut by knives, so they have significantly higher cut resistance than conventional protective materials that use cotton or the like. Therefore, in the automobile industry, home appliance industry, etc., work that handles sheet metal products with burrs, work that handles easily breakable glass products, and work that handles general garbage that may contain metal and glass pieces is required. It has been widely used to protect the hands and bodies of workers during work where cuts are likely to occur.

However, although work gloves manufactured using such high-performance organic fibers have excellent cut resistance, they have problems such as comfort and fluff, so multifilament yarns made of high-performance organic fibers are used. A material with a crimped finish is used.

As a method for crimping high-performance organic fibers, Patent Document 1 describes a method for crimping high-performance organic fibers in the S-twisting direction and Z-twisting direction, in which multifilament yarns of high-performance organic fibers are subjected to a continuous false-twisting process of twisting, dehydration, and untwisting. Patent Document 2 describes a method in which each false-twisted crimped yarn in the twisting direction is aligned and entangled on the same machine, and then wound up. A method is disclosed for manufacturing a non-torque bulky yarn by combining two or more yarns obtained in the above manner in a pre-winding process, and then intertwining the yarns with each other using an air jet.

Generally, when high-performance organic fibers that have been processed to be bulky (sheath yarns) and core yarns (elastic yarns, metal fibers, etc.) are aligned and composited on the same machine, the coverage of the core yarn is poor. Therefore, the high-performance organic fibers that have been processed to be bulky are once rolled up and then wound around elastic yarns or metal fibers in a covering machine to be processed into core-sheath yarns. The core-sheath yarns are then knitted into a fibrous structure.
Considering the application to the field of precision machinery, it is desirable that the fluff of multifilament yarns of high-performance organic fibers be as small as possible. It is disclosed that fluff can be reduced by doing so.

JP2003-306838A Japanese Unexamined Patent Publication No. 48-50054 Patent No. 6016399

However, the methods disclosed in Patent Documents 1 and 2 do not sufficiently solve the problem of dust generation.
In the method disclosed in Patent Document 1, the high-performance organic fiber yarn has been applied in the form of non-crimped multifilament yarn, spun yarn, etc., and as a result, it is uncomfortable to wear and is not suitable for work use such as uniforms. When worn as a product, it is difficult to carry out activities, especially in work gloves used in the aircraft industry, information equipment industry, etc. where precision parts are handled, filament yarns are uncomfortable to wear and work efficiency is reduced, and spun yarns tend to be fluffy. This is in response to problems such as the generation of dust.
Specifically, as a method for rationally manufacturing crimped yarns of high-performance organic fibers using multifilament yarns, each false-twisted crimped yarn in the S-twisting direction and the Z-twisting direction is manufactured using the same machine. It is only disclosed that the number of residual torque twists of a double thread-like high-performance crimped yarn can be reduced to almost zero by performing the above-described alignment and entangling treatment and then winding it up.
In addition, it is stated that high-performance crimped yarn wound in the form of a single yarn and filament yarn or spun yarn of other synthetic fibers may be subjected to composite processing such as twisting or blending. There is no mention of aligning them on the same machine before winding them up.

The present invention has been made in view of the above circumstances, and provides a composite yarn that does not require a covering process after winding the crimped yarn, has high productivity, is practical in terms of equipment and costs, and has less fluff. The challenge is to provide the following.
Another object of the present invention is to provide a composite yarn manufacturing method that enables false twisting of raw yarn and winding around a core yarn on the same machine.

In order to solve this problem, as a result of intensive studies, the present invention has been developed by combining a false-twisted yarn that is false-twisted with the same machine (same device) and another false-twisted yarn that is twisted in the opposite direction. The present invention was achieved by discovering that the problems to be solved by the present invention can be solved all at once by supplying the core yarn to a fluid entangling nozzle.

That is, the present invention provides one false-twisted yarn composed of a multifilament yarn made only of organic fibers (but not including elastic yarns), and a false-twisted yarn having a twist in the opposite direction to the above-mentioned false-twisted yarn. To provide a composite yarn characterized in that one yarn and elastic yarn or metal fiber are mixed on the same machine.

In addition, the present invention applies a false twisting process including a heat setting process to a plurality of multifilament yarns made only of organic fibers (but does not contain elastic yarns), and creates two false-twisted yarns having twists in different directions. A false twisting process to obtain yarn;
A blending step of mixing one false twisted yarn, one false twisted yarn having a twist in the opposite direction, and an elastic yarn or metal fiber,
The present invention provides a method for manufacturing a composite yarn, characterized in that the false twisting step and the blending step are performed continuously on the same machine.

According to the present invention, two false-twisted yarns with different twisting directions are obtained on a false-twisting machine, and then composited with elastic yarns and metal fibers on the same machine (same device) to produce a composite yarn. Not only can the process be simplified (that is, the covering step for the core yarn can be omitted), but also fiber damage to the organic fibers can be suppressed. This method is particularly effective for producing composite yarns containing aramid fibers and the like.
Composite yarns have a simplified manufacturing process, so dust generation is suppressed in textile products (work gloves, etc.) processed from composite yarns, compared to conventional core-sheath yarns.

FIG. 3 is a diagram showing a representative example of the method for manufacturing a composite yarn of the present invention.

Hereinafter, the method for manufacturing a composite yarn and the composite yarn of the present invention will be explained in detail.

(core yarn)
As the core yarn in the composite yarn of the present invention, known organic or inorganic filament yarns can be used; for example, organic yarns include elastic yarns, and inorganic yarns include metal fibers, mineral fibers, glass fibers, etc. .

By using a stretchable elastic yarn as the core yarn, elasticity can be imparted to the composite yarn. As the elastic thread, a known organic elastic thread can be used, and polyurethane elastic thread is preferable since it has high elasticity. The cross-sectional shape of the polyurethane elastic thread is not particularly limited, and may be circular or flat, and the fibers thereof may be monofilaments or welded multifilaments.

The elastic yarn preferably has a breaking elongation of 200% or more, more preferably 300% or more, from the viewpoint of imparting stretchability to the fiber structure. If it is less than 200%, the knitted glove may not be able to have sufficient elasticity.
The elastic yarn preferably has a stretch recovery rate of 10% or more, more preferably 40% or more. The stretch recovery rate is a value measured according to JIS L 1013:2010 Chemical Fiber Filament Yarn Test Method 8.12.

By using an inorganic filament as the core yarn, cut resistance can be imparted to the composite yarn. Among inorganic filaments, metal fibers are preferred because of their excellent workability and cut resistance. Metal fibers have excellent cut resistance especially from sharp edges of metal sheets and parts, glass plates, knives, cutlery, etc., and can be used as thin wires.
Examples of the metal constituting the metal fiber include stainless steel (eg, SUS304, SUS316), tungsten, copper, aluminum, and the like. Among these metal fibers, stainless steel or tungsten fiber filaments are preferred from the viewpoint of good rust resistance, tensile properties, and knitting properties.

As the inorganic filament, one single filament or multifilament yarn, or a plurality of filaments aligned, plied and twisted, etc. can be used. Furthermore, an inorganic filament coated or welded with a resin, rubber, etc. can be used as long as the thread breakage, cut resistance, and knitting properties described below are not impaired. The inorganic filament may be composed of a single inorganic filament or one coated with a resin or rubber and welded to the inorganic filament from the viewpoint of preventing a decrease in coverage during production of the composite yarn.

The fineness of the organic and inorganic filaments is preferably in the range of 22 to 200 dtex, more preferably in the range of 44 to 156 dtex. If it is 22 dtex or more, it is unlikely to cause thread breakage during the manufacturing process of composite yarns or fiber structures, and if it is 200 dtex or less, it will provide a good fit when wearing protective clothing such as gloves.
Note that in the case of metal fibers, the diameter is preferably 15 μm to 100 μm. If it is 15 μm or more, the cut resistance will be sufficient, and if it is 100 μm or less, the knitting properties of the yarn and the texture of the fabric will not be significantly deteriorated. The diameter of the metal fiber is more preferably 20 μm to 70 μm, even more preferably 30 μm to 60 μm.

(organic fiber)
The multifilament yarn used in the present invention is composed only of organic fibers (but does not contain elastic yarns). This is because it is difficult to obtain a fiber structure that is comfortable to wear using threads containing inorganic fibers (metal fibers, carbon fibers, etc.).

The organic fiber constituting the composite yarn is a high-quality yarn whose tensile strength measured based on JIS L 1013 is preferably 17.5 cN/dtex or more, more preferably 20 cN/dtex or more. Strong organic fibers are preferred.
Further, the organic fiber preferably has a tensile modulus of elasticity of 400 cN/dtex or more, more preferably 440 cN/dtex or more, as measured based on JIS L 1013. By using high-strength organic fibers with high elastic modulus, it is possible to impart tensile strength, high bending resistance, and abrasion resistance to composite yarns, and there is no yarn breakage during knitting, making it easy to weave. Since dynamic tearing performance and cut resistance can be imparted to the knitted fabric, there is no need for yarns (trailing yarns) that run along or wrap around the core yarn.

As the above-mentioned high-strength organic fibers, fiber threads made of para-aramid fibers, meta-aramid fibers, etc., and having thread physical properties that have excellent heat resistance and durability can be employed. For example, aramid fibers (e.g., polyparaphenylene terephthalamide fiber (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar"), polymetaphenylene isophthalamide fiber (manufactured by DuPont, trade name "Nomex"), copolyparaphenylene-3, Examples include 4'-diphenyl ether terephthalamide fiber (manufactured by Teijin Ltd., trade name "Technora").

In addition to aramid fibers, fully aromatic polyester fibers (for example, manufactured by Kuraray Co., Ltd., trade name "Vectran"), polyparaphenylenebenzobisoxazole fibers (for example, manufactured by Toyobo Co., Ltd., trade name "Zylon"), Strong polyethylene fibers (for example, manufactured by Toyobo Co., Ltd., trade name "Izanas"), polyketone fibers (for example, manufactured by Asahi Kasei Fibers Co., Ltd., trade name "Cybalon"), polyamide-imide fibers (for example, manufactured by Rhone-Poulenc, trade name "Cybalon"), liquid crystalline polyester fibers, polyetherketone (PEK) fibers, polyetherketoneketone (PEKK) fibers, and polyetheretherketone (PEEK) fibers.

Among high-strength organic fibers, aramid fibers are preferred, and para-aramid fibers are more preferred, since they are heat resistant and flame retardant, as well as having high strength and cut resistance. The aramid fiber can be manufactured by a known method or a similar method, and commercially available products may also be used. Among them, polyparaphenylene terephthalamide fiber is particularly preferred because it has high strength, high modulus, and excellent cut resistance and heat resistance.

The organic fibers may be used as composite yarns such as blending or intertwisting high-strength organic fibers with other known fibers such as polyester fibers, polyamide (nylon) fibers, and polyvinyl alcohol fibers, to the extent that the effects of the present invention are not impaired. May be used.

(Method for manufacturing composite yarn)
Next, the method for manufacturing the composite yarn of the present invention will be explained step by step.
FIG. 1 shows a typical example of the method for manufacturing the composite yarn of the present invention. The multifilament yarns (1, 2) of high-performance fibers that have been unwound from cheese and have not yet been false-twisted pass through a feed roller (3) and are then subjected to a dry heat treatment using a false-twisting heater (4). The multifilament yarns (1, 2) of dry heat-treated high-performance fibers are twisted in an S-twist or a Z-twist, respectively, in a spindle device (5).
That is, if the multifilament yarn (1) is S-twisted (Z-twisted), the multifilament yarn (2) is processed to be Z-twisted (S-twisted). By applying the opposite twist in this way, the torque is reversed, and if the torque is the same, the composite yarn becomes a non-torque yarn. If the yarn is a non-torque yarn, the knitted fabric will not run diagonally when it is knitted.

The number of false twists by the false twist spindle device (5) is determined by the value of the twist coefficient (K ₁ ) expressed by the following formula (I) in order to appropriately crimp the yarn and prevent fiber breakage due to excessive twisting. is about 10,000 to 40,000, preferably about 12,000 to 38,000. As the false twisting spindle, a 1-pin, 2-pin or 4-pin spinner can be used.

K ₁ =t×D ^1/2 (I)
[However, t represents the number of false twists (times/m), and D represents the fineness (tex). ]

For the heat setting temperature conditions in the false twist heater, high temperature treatment is suitable in order for the crimped yarn to have the desired bulkiness and elasticity, and it is preferably near the melting point or decomposition start temperature of the organic fiber. . Preferred temperature conditions vary depending on the fiber, but in the case of para-aramid fibers, the ambient temperature inside the heater through which the yarn passes is about 300 to 650°C, more preferably 350 to 600°C.

The heater in the dry heat treatment may be a contact heater or a non-contact heater, and the dry heat treatment may be performed by known means. The heating time varies depending on the type of organic fiber, the thickness of the yarn, the heating temperature, etc., but is usually desirably about 0.005 to 2 seconds. More preferably, it is about 0.01 to 1.5 seconds. The dry heat treatment may be performed under increased pressure, reduced pressure, or normal pressure, but is preferably performed under normal pressure.

As shown in Figure 1, the multifilament yarn (2) that has passed through the spindle device (5) is supplied to the first delivery roller (7) together with the elastic yarn or metal fiber, and then together with the multifilament yarn (1). It is supplied to an interlacing nozzle (8) and subjected to an interlacing process. Thereafter, it passes through a second delivery roller (9) and is wound up into a rolled cheese (10).
As the interlacing nozzle (8), a known fluid processing nozzle such as a Taslan nozzle or an interlaced nozzle is used. Among these, it is preferable to use an interlaced nozzle.

In FIG. 1, the elastic yarn supplied to the first delivery roller (7) preferably has a draft magnification of 1.5 to 5.0 times, preferably 2.0 to 4.0 times. If it is less than 1.5 times, it will be difficult for the elastic yarn to become a core yarn, making it difficult for the multifilament yarn to wrap around the outer periphery of the core yarn, and if it exceeds 5.0 times, the core yarn will easily break, reducing productivity. becomes worse.
In FIG. 1, the elastic yarn used as the core yarn (6) is actively fed by a rolling yarn feeding roller and pre-drafted between it and the first delivery roller (7). The draft magnification in this case refers to the entire draft between the yarn feeding roller (6) and the first delivery roller (7).
The obtained composite yarn A is wound around cheese (10) by a second delivery roller (9).

In the production method using the above false-twisting method, when producing crimped yarns of para-aramid fibers, the moisture content of the para-aramid fibers before false-twisting is preferably 20% or less, more preferably 15%. Below, it is particularly desirable to use 1 to 10%. In this case, in the above formula (I), D represents the fineness (tex) containing water. If the moisture content before twisting exceeds 20%, heat will not be efficiently transferred to the yarn during dry heat treatment and a heat setting effect will not be obtained, making it difficult to obtain a good crimped yarn. On the other hand, if the moisture content before twisting is less than 1%, there is a risk that the yarn may become fibrillated due to friction from the yarn guide, etc.

The number of filaments of the organic fiber may be appropriately selected depending on the purpose of use or in consideration of the dynamic tearing performance, cutting force, elasticity, flexibility, texture, etc. of the fibrous structure. The fineness is preferably in the range of 56 to 1,670 dtex. If the fineness is 56 dtex or more, dynamic tearing performance and further cutting force can be imparted to the fiber structure even when an elastic yarn is used as a core yarn. Further, if the fineness is 1,670 dtex or less, the gloves can be knitted using a general-purpose knitting machine, and there is no fear that the fiber structure (gloves) will harden and the feeling of wearing will deteriorate. More preferably 220 to 1,100 dtex.

The single yarn fineness of the organic fiber is preferably in the range of 0.1 to 10.0 dtex. The range is more preferably 0.6 to 6.0 dtex, and even more preferably 1.0 to 3.0 dtex. By setting the single yarn fineness to 0.1 dtex or more, it is possible to improve the productivity of the raw yarn (reducing yarn breakage), the quality of the false twisted yarn (suppressing the generation of fuzz), and the flexibility and cut resistance of the fiber structure. Moreover, by setting the tex to 10.0 dtex or less, it becomes easy to obtain a fibrous structure that has flexibility and cut resistance, does not cause hardening of the fabric, and is comfortable to wear.

(composite yarn)
The composite yarn of the present invention includes one false-twisted yarn composed of a multifilament yarn made only of organic fibers (but does not contain elastic yarn), and a false-twisted yarn that is twisted in the opposite direction to the above-mentioned false-twisted yarn. A processed yarn and elastic yarn or metal fiber are mixed together on the same machine.
In the composite yarn, the ratio of the elastic yarn or metal fiber (core yarn) to the organic fiber is preferably in the range of 5 to 70:30 to 95 by mass. If the proportion of elastic yarn is too small, the elongation of the fibrous structure tends to be insufficient, while if it is too large, the cut resistance of the fibrous structure tends to decrease. Furthermore, if the proportion of metal fibers is too small, the cut resistance of the fibrous structure tends to be insufficient, while if it is too large, the fibrous structure tends to become hard. A more preferable ratio is in the range of 10 to 50:50 to 90 by mass.

In the composite yarn of the present invention, the coverage of the organic fiber with respect to the core yarn (described in detail in Examples) is preferably 70% or more and 95% or less. When the coverage rate is 70% or more, the cut resistance of the composite yarn can be maintained at a high level, and when the coverage rate is 95% or less, the cost increases in the blending process and the productivity of the composite yarn increases. It is possible to prevent a significant decrease in The coverage is more preferably 75% or more and 95% or less, and even more preferably 80% or more and 95% or less.

The composite yarn obtained by the above method is made of high-performance fibers, synthetic fibers such as polyamide (nylon) fibers and polyester fibers, natural fibers such as cotton, etc., in order to obtain better coverage. Alternatively, other known fibers may be spirally wound to cover the core yarn in a double (DCY: double covered yarn) or triple layer.

The proportion of para-aramid fibers in the composite yarn excluding the core yarn should be 60% by mass or more from the viewpoint of obtaining a fiber structure with cut resistance even when an elastic yarn with a small cutting force is used as the core yarn. The content is preferably 80% by mass or more, and even more preferably 100% by mass. Preferred fibers to be used in combination with para-aramid fibers include, in addition to meta-aramid fibers, fully aromatic polyester fibers, polyparaphenylenebenzobisoxazole fibers, polybenzimidazole fibers, polyimide fibers, polyphenylene sulfide fibers, etc. .

The composite yarn of the present invention is subjected to false twisting and blending on the same machine. By false twisting and blending on the same machine, it is possible to reduce the fuzz of organic fibers in the winding process after false twisting, and even if it does not result in fuzz generation, it can be a cause of fuzz generation. Fibrillation of fibers can be suppressed. Therefore, dust generation is significantly suppressed in the fiber structure made by weaving and knitting the composite yarn of the present invention.

The total fineness of the composite yarn varies depending on the type and purpose of the fiber structure, as well as the type of knitting machine and loom, so it is possible to impart a certain cut resistance to the fiber structure and improve knitting and weaving properties. It is preferable to set the value within a range that allows a lightweight fiber structure to be obtained without significantly deteriorating. For example, in the case of a composite yarn for glove knitting, a range of 200 to 800 dtex is preferable.
The composite yarn used in the present invention may be colored with a dye or pigment, if necessary. As a coloring method, a spun dyed yarn obtained by mixing a dye or pigment with a polymer before spinning may be used, or a yarn colored by various methods may be used. The knitted fabric may be colored with dyes or pigments.

[Fiber structure]
The fiber structure of the present invention is produced by weaving the composite yarn of the present invention into a woven fabric, knitted fabric, etc. by a known method. In addition to the above-mentioned composite threads, the fiber structure may contain known fiber threads such as nylon fibers and polyester fibers in the form of splint threads, etc., within a range that does not impede the effects of the present invention.

The fiber structure of the present invention exhibits low dust generation when the basis weight is in the range of 200 to 500 g/m ² . If the fabric weight is 200 g/m ² or more, cut resistance can be ensured as a working glove, and if the fabric weight is 500 g/m ² or less, the knitting properties will not be significantly deteriorated. The basis weight of the fibrous structure is more preferably 300 g/m ² or more, particularly preferably 400 g/m ² or more. If the basis weight is less than 200 g/m ² , the knitted fabric tends to spread when the fibrous structure comes into contact with nails or protrusions, which may reduce the cutting force.

For example, when knitting a composite yarn into a knitted fabric to produce a knitted fabric (gloves), a commercially available knitting machine can be appropriately employed. In plating knitting, the composite yarn of the present invention is used as the ground thread, and knitting is performed so that either the ground thread or the plated thread is placed on the outer surface or the inner surface. When knitting with the ground thread on the outside and the plate threads on the inside, the glove is used as it is, and when knitting with the ground thread on the inside and the plate thread on the outside, the finished glove is used as the inner/plint. The outer surface is turned upside down and the ground thread is finally placed on the outer surface and the splint threads are placed on the inner surface to form a glove. By doing this, when wearing gloves, the contact between the composite yarn and the user's skin can be relatively suppressed, and since the splints come into contact with the skin, the feeling of wearing and sweat absorption improves, and the outer ground yarn (Composite yarn) prevents damage to the inner splint from damage caused by external sharp objects during work, increasing the durability of the glove. Regarding the knitting method, any method can be used depending on the ease of knitting.

As the splint thread, we use stretchable woolly nylon thread, polyurethane elastic thread, and the elastic thread and other fibers by using a fluid jet to improve the fit of the glove (tightness, stretchability) and workability. Preferably, elastic interlaced yarns formed by interlacing treatment are used. The fineness of the splint is preferably 30 to 190 dtex.

When knitting using a seamless knitting machine or a computerized glove knitting machine, the number of gauges set during knitting is preferably set to 10 to 15 gauge. The gauge number is an indicator of the number of needles per inch; the higher the number, the thinner the gloves will be. If the gauge number is less than 10 gauge, the weight will increase and the lightness will be impaired, and if it exceeds 15 gauge, the desired number of dust particles (with a particle size of 0.1 μm or more) will be 40,000 particles per two gloves. / ^m3 or less) may not be achieved.

After the yarn for knitting is unwound from the package, the main devices present in the yarn path of the knitting machine are the yarn guide plate, the first tension adjuster, the felt for adding oil, the yarn breakage detection spring, and the second There is a tension adjustment machine, and the yarn is guided through a top spring to a yarn feeder, where it is finally knitted with needles. These two tension adjusters are thread guides for applying stable tension to the thread, and include a washer tensioner, a spring tensioner, and the like.

Common surface finishing methods for thread guides include satin finish and mirror finish. If the contact surface of the yarn guide with the yarn is satin-like, the friction with the yarn is reduced, and the yarn guide near the package can mainly suppress fibrillation of organic fibers, and the subsequent The thread guide can suppress fragmentation of fibrils of organic fibers or abrasion of the fiber surface.

Examples of materials for the surface of the tension adjuster that come into contact with the thread include: metal with satin chrome plating; metal coated with ceramics such as titanium, alumina, titanium carbide, Teflon (registered trademark), silicone, etc. Examples include ceramics such as titanium, alumina, and zirconia.

It is effective to use a tension adjuster, which is a thread guide for applying tension to the thread, that has a satin-like surface that comes in contact with the thread. The tension adjuster is a combination of structural members that have been subjected to a satin finish, or components that are made of satin-finished materials (for example, the surface of the tension washer is a satin-finished product, and the tensioner shaft is a part made of alumina ceramic). etc. This has the effect of preventing the yarn from being rubbed and producing a large amount of fibrils and scraps when tension is applied to the yarn in order to stably supply the yarn. Furthermore, it is preferable to use ceramics for the other thread guides, and more excellent effects can be achieved.

The surface (in whole or in part) of the fiber structure (glove) of the present invention can be coated with rubber or a resin coating material such as polyurethane resin, silicone resin, acrylic resin, or epoxy resin.
The obtained fiber structure can be used as a material for protective equipment such as work clothes, work gloves, work arm covers, work finger cots, etc., or as a material for sports clothes such as outdoor sports clothes and general sports clothes. It can be suitably used as a material for articles such as shoes, bags, bags, and other industrial materials.

Hereinafter, the present invention will be explained in more detail using Examples and Comparative Examples, but the present invention is not limited only to the following Examples. The methods for measuring each physical property value in the following Examples and Comparative Examples are as follows.

[Fineness]
Measured according to JIS L 1013:2010 Chemical fiber filament yarn test method 8.3 Method B (simple method).

[Coverage rate]
It was calculated using the calculation method below.
1) Count the wales (vertical stitches) and courses (horizontal stitches) per inch of the knitted fabric.
2) Calculate the value multiplied by wale and course. (all intersection points)
3) Count the number of exposed core threads in the area per 1 inch in length and 1 inch in width.
4) Divide the number of exposed core yarns by the product of wales and courses (total intersecting points) to determine the uncovered ratio, and determine the coverage rate based on this.

[Cut resistance of gloves]
The cut force (N) on the palm of one glove was measured in accordance with JIS T 8052:2005 "Protective clothing - Mechanical properties - Cut resistance test method against sharp objects". Cut resistance was determined by dividing the cut force (N) by the fabric weight of the woven or knitted material and multiplying it by 100. It was determined that the larger the value of cutting force, the harder it was to cut. The measuring device used was TDM-100 manufactured by RGI.

[Evaluation method of dust generation amount]
Four gloves were tested in accordance with JIS B 9923-1997 (Contamination of clean room clothing) using a tumbling dust generation tester installed in a clean room (cleanliness: ISO class 5) without clean washing (Note). Particle measurement method) Dust was generated by the tumbling method, and the number of particles with each particle size or larger was measured using a particle counter to determine the number of particles (particle number) with a particle size of 0.1 μm or larger.
The number of measurements was 5 times, and the maximum and minimum values were excluded, and the average value of the remaining measured values was converted into the amount of dust generated per two gloves. Note that the rotational speed of the drum was 30 revolutions/minute, and the flow rate of discharged air was 0.0102 m ³ /second.
(Note) Clean room washing: An optional method in which gloves are washed in a washing machine installed in a clean room to remove dust adhering to them, then rinsed with pure water, then dried and packed.

[Comfort and fit of gloves]
A wearing test was conducted by 5 subjects. According to 5.2 of EN 420:2003 Protective Gloves - General requirements and test methods, all test subjects gave Dexterity a level 5 performance rating, and in the sensory evaluation, 3 or more out of 5 participants found it "comfortable to wear". Those who were evaluated as ``pass'' (◯) were evaluated as passing (○), and the others were evaluated as failing (×).

(Example 1)
Polyparaphenylene terephthalamide fiber (hereinafter referred to as "PPTA") (manufactured by DuPont-Toray Co., Ltd., product name "Kevlar" (registered trademark)) with a total fineness of 221 dtex, a single fiber fineness of 1.65 dtex, and a number of filaments of 134. Using two filament yarns, each false-twisted yarn was obtained by S twist and Z twist under the following false twisting conditions, and then on the same machine, a polyurethane elastic yarn (Toray Operantex) with a total fineness of 44 dtex was Co., Ltd., trade name "Lycra" (registered trademark)) was supplied while being drafted 3 times, and intertwined with each of the false twisted yarns to obtain a composite yarn.

False twisting speed: 80m/min
False twisting temperature (dry heat): 450℃
Number of false twists t: 2000 times/m
False twisting direction: S twist, Z twist Draft magnification of polyurethane elastic yarn: 3x

When feeding one of the obtained composite yarns to a 15-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two of the washer tensors in the yarn guide were used with matte surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 22.6 g, and the basis weight of the palms was 278 g/m ² .
In other words, the thread guide part of the tensor shaft of the washer tenser is made of alumina ceramic guide (YM99C manufactured by Yuasa Thodo Co., Ltd., density 3.8, hardness 1,800, Rmax 1.5 μm), and the two upper and lower tension washers are plated with satin chrome. The other thread guide guides used were a mixture of alumina ceramic, satin chrome plated, and unplated guides without changing the specifications of the knitting machine.

In the gloves produced in Example 1, the number of particles with a particle size of 0.1 μm or more was 23,537 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 5.5N. . As a result, gloves with good wearing evaluation and low dust generation were obtained.

(Example 2)
Two multifilament yarns of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 221 dtex, a single fiber fineness of 1.65 dtex, and a number of filaments of 134. After obtaining each false twisted yarn using S twist and Z twist under the following false twisting conditions, on the same machine, polyurethane elastic yarn with a total fineness of 78 dtex (manufactured by Toray Operantex Co., Ltd., product "Lycra" (registered trademark)) was supplied while being drafted 3 times, and intertwined with each of the false twisted yarns to obtain a composite yarn.

False twisting speed: 80m/min
False twisting temperature (dry heat): 450℃
Number of false twists t: 2000 times/m
False twisting direction: S twist, Z twist Draft magnification of polyurethane elastic yarn: 3x

When feeding one of the obtained composite yarns to a 15-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two of the washer tensors in the yarn guide were used with matte surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 25.8 g, and the basis weight of the palms was 301 g/m ² .

In the gloves produced in Example 2, the number of particles with a particle size of 0.1 μm or more was 22,137 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 7.3N. . As a result, gloves with good wearing evaluation and low dust generation were obtained.

(Example 3)
Two multifilament yarns of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 221 dtex, a single fiber fineness of 1.65 dtex, and a number of filaments of 134. After obtaining each false twisted yarn using S twist and Z twist under the following false twisting conditions, metal fiber (SUS, wire diameter 50 μm) was further supplied on the same machine, and together with each of the above false twisted yarns. A composite yarn was obtained by interlacing.

False twisting speed: 80m/min
False twisting temperature (dry heat): 450℃
Number of false twists t: 2000 times/m
False twisting direction: S twist, Z twist

When feeding one of the obtained composite yarns to a 15-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two of the washer tensors in the yarn guide were used with matte surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 30.6 g, and the basis weight of the palms was 320 g/m ² .

In the gloves produced in Example 3, the number of particles with a particle size of 0.1 μm or more was 25,231 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 19.5 N. . As a result, gloves with good wearing evaluation and low dust generation were obtained.

(Example 4)
Two multifilament yarns of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 444 dtex, a single fiber fineness of 1.66 dtex, and a number of filaments of 267. After obtaining each false twisted yarn using S twist and Z twist under the following false twisting conditions, on the same machine, polyurethane elastic yarn with a total fineness of 78 dtex (manufactured by Toray Operantex Co., Ltd., product "Lycra" (registered trademark)) was supplied while being drafted 3 times, and intertwined with each of the false twisted yarns to obtain a composite yarn.

False twisting speed: 70m/min
False twisting temperature (dry heat): 500℃
Number of false twists t: 1000 times/m
False twisting direction: S twist, Z twist Draft magnification of polyurethane elastic yarn: 3x

When feeding one of the obtained composite yarns to a 10-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two washer tensors in the thread guide were used with matte-like surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 35.2 g, and the basis weight of the palms was 350 g/m ² .

In the gloves produced in Example 4, the number of particles with a particle size of 0.1 μm or more was 31,113 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 12.1N. . As a result, gloves with good wearing evaluation and low dust generation were obtained.

(Example 5)
Polyparaphenylene terephthalamide fiber (hereinafter referred to as "PPTA") (manufactured by DuPont-Toray Co., Ltd., product name "Kevlar" (registered trademark)) with a total fineness of 444 dtex, a single fiber fineness of 1.66 dtex, and a number of filaments of 267. Using two filament yarns, after obtaining each false-twisted yarn by S twist and Z twist under the following false twisting conditions, on the same machine, polyurethane elastic yarn (Toray Operantex) with a total fineness of 156 dtex Co., Ltd., trade name "Lycra" (registered trademark)) was supplied while being drafted 3 times, and intertwined with each of the false twisted yarns to obtain a composite yarn.

False twisting speed: 70m/min
False twisting temperature (dry heat): 500℃
Number of false twists t: 1000 times/m
False twisting direction: S twist, Z twist Draft magnification of polyurethane elastic yarn: 3x

When feeding one of the obtained composite yarns to a 10-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two washer tensors in the thread guide were used with matte-like surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 39.0 g, and the basis weight of the palms was 381 g/m ² .

In the gloves produced in Example 5, the number of particles with a particle size of 0.1 μm or more was 34,089 particles/ ^m3 or less per unit weight of the glove (low dust generation), and the cutting force was 14.0 N. . As a result, gloves with good wearing evaluation and low dust generation were obtained.

(Example 6)
Two multifilament yarns of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 444 dtex, a single fiber fineness of 1.66 dtex, and a number of filaments of 267. After obtaining each false twisted yarn using S twist and Z twist under the following false twisting conditions, metal fiber (SUS, wire diameter 50 μm) was further supplied on the same machine, and together with each of the above false twisted yarns. A composite yarn was obtained by interlacing.

False twisting speed: 70m/min
False twisting temperature (dry heat): 500℃
Number of false twists t: 1000 times/m
False twisting direction: S twist, Z twist

When feeding one of the obtained composite yarns to a 10-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two washer tensors in the thread guide were used with matte-like surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 40.3 g, and the basis weight of the palms was 450 g/m ² .

In the gloves produced in Example 6, the number of particles with a particle size of 0.1 μm or more was 38,221 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 22.0 N. . As a result, gloves with good wearing evaluation and low dust generation were obtained.

(Comparative example 1)
Using multifilament yarn of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 444 dtex, a single fiber fineness of 1.66 dtex, and a number of filaments of 267. A Z-twist was false-twisted using a false-twisting machine to obtain one processed yarn. After that, in a separate process, a polyurethane elastic yarn with a total fineness of 78 dtex (manufactured by Toray Operantex Co., Ltd., trade name "Lycra" (registered trademark)) was used as a core yarn, and one of the obtained processed yarns was used as a sheath yarn. Covering processing was performed under the following conditions.

Draft: 3.0 times Number of twists: 200T/m
Spindle rotation speed: 5000rpm
Winding ratio: 93.0%

When feeding one of the obtained composite yarns to a 10-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two washer tensors in the thread guide were used with matte-like surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 37.0 g, and the basis weight of the palms was 354 g/m ² .

In the gloves produced in Comparative Example 1, the number of particles with a particle size of 0.1 μm or more was 52,562 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 11.8 N. . As a result, since the process is divided into two processes: false twisting and covering, the number of times the yarn guide and the composite yarn are rubbed during processing increases, resulting in poor dust generation.Also, while the covering yarn has good convergence, , the cut resistance was lower because the bulkiness was poor and the fabric was thinner.

(Comparative example 2)
Using multifilament yarn of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 444 dtex, a single fiber fineness of 1.66 dtex, and a number of filaments of 267. A Z-twist was false-twisted using a false-twisting machine to obtain one processed yarn. After that, in a separate process, a polyurethane elastic yarn with a total fineness of 235 dtex (manufactured by Toray Operantex Co., Ltd., trade name "Lycra" (registered trademark)) was used as a core yarn, and one of the obtained processed yarns was used as a sheath yarn. Covering processing was performed under the following conditions.

Draft: 3.0 times Number of twists: 200T/m
Spindle rotation speed: 5000rpm
Winding ratio: 93.0%

When feeding one of the obtained composite yarns to a 10-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two washer tensors in the thread guide were used with matte-like surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 44.2 g, and the basis weight of the palms was 411 g/m ² .

In the gloves produced in Comparative Example 2, the number of particles with a particle size of 0.1 μm or more was 62,341 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 14.9 N. . As a result, since the process is divided into two processes: false twisting and covering, the number of times the yarn guide and the composite yarn are rubbed during processing increases, resulting in poor dust generation, and the elastic yarn used as the core yarn of the covering yarn The fineness of the fabric was thicker, which increased the resistance to cuts due to clogging of the fabric, but the hardening of the fabric worsened the wearing comfort.

(Comparative example 3)
Using multifilament yarn of polyparaphenylene terephthalamide fiber (PPTA) (manufactured by DuPont-Toray Co., Ltd., trade name "Kevlar" (registered trademark)) with a total fineness of 444 dtex, a single fiber fineness of 1.66 dtex, and a number of filaments of 267. S-twist was false-twisted using a false-twisting machine to obtain one processed yarn. After that, in a separate process, metal fiber (SUS, wire diameter 50 μm) was used as a core thread, one of the obtained processed threads was wound spirally in the S direction as a sheath thread, and woolly nylon fiber was further twisted into a false-twisted thread. A covering thread was obtained which was spirally wound in the opposite direction.

Draft: 3.0 times Number of twists: 200T/m
Spindle rotation speed: 5000rpm
Winding ratio: 93.0%

When feeding one of the obtained composite yarns to a 10-gauge type glove knitting machine (Shima Seiki Seisakusho Co., Ltd.), two washer tensors in the thread guide were used with matte-like surfaces. knitted seamless gloves using conventional methods. The weight of the two gloves was 48.9 g, and the basis weight of the palms was 443 g/m ² .

In the gloves produced in Comparative Example 3, the number of particles with a particle size of 0.1 μm or more was 81,762 particles/ ^m3 or less per glove weight (low dust generation), and the cutting force was 23.0N. . As a result, since the process is divided into two processes: false twisting and covering, the number of times the thread guide section and the composite yarn are rubbed during processing increases, resulting in worsening of dust generation.

The glove configuration and evaluation results are summarized in Table 1.

From Table 1, it is usually a two-step process in which false twisting is followed by covering (core yarn: elastic yarn or metal fiber, sheath yarn: false twisted yarn), but false twisting and covering are performed on the same machine. This not only improves productivity by reducing the number of steps, but also eliminates abrasion between the yarn and the yarn guide, which prevents a decrease in the cut resistance of knitted fabrics and reduces the number of particles with a particle size of 0.1 μm or more. It can be seen that a knitted fabric with less dust generation can be obtained, which is 40,000 pieces/m ³ or less per two gloves, compared to gloves made with conventional covering yarn.

By using the composite yarn of the present invention, it is possible to obtain gloves (fibrous structures) that have lower dust generation and excellent cut resistance than conventional gloves. The low dust-emitting and cut-resistant gloves of the present invention are particularly useful as gloves for various tasks performed in clean rooms in order to meet standards for clean room clothing, and as work gloves in medical, high-tech industries, etc. Other industries include forestry (contact with protrusions due to climbing into mountains to cut branches), fishing industry (contact with fishing hooks), food manufacturing industry (contact with cutlery), equipment construction, steel industry, chemical industry, and ceramic industry.・As protective clothing, work clothes, work gloves, etc. in the earth and stone product manufacturing industry, the transportation machinery and equipment manufacturing industry (contact with protrusions such as burrs during work), and the electrical machinery and equipment manufacturing industry (contact with the tip of electric wires) Alternatively, it is useful as sports gloves, motorcycle suits, gloves, etc.

1: Multifilament yarn (raw yarn before false twisting)
2: Multifilament yarn (raw yarn before false twisting)
3: Feed roller 4: False twist heater 5: Spindle device 6: Elastic thread or metal fiber 7: First delivery roller 8: Interlacing nozzle 9: Second delivery roller 10: Winding cheese 11: Winding roller

Claims (8)

One false-twisted yarn composed of multifilament yarn made only of organic fibers (but not including elastic yarns), one false-twisted yarn having a twist in the opposite direction to the above false-twisted yarn, and an elastic yarn. Composite yarn made by mixing threads or metal fibers on the same machine. The composite yarn according to claim 1, wherein the coverage ratio of the organic fiber to the elastic yarn or the metal fiber is 70% or more and 95% or less. The composite yarn according to claim 1 or 2, wherein the composite yarn is a non-torque yarn. The composite yarn according to any one of claims 1 to 3, wherein the organic fiber has a fineness of 56 to 1,670 dtex, and the elastic yarn or metal fiber has a fineness of 22 to 200 dtex. The composite yarn according to any one of claims 1 to 4, wherein the elastic yarn is a polyurethane elastic yarn. A fiber structure comprising the composite yarn according to any one of claims 1 to 5. Protective clothing comprising the fiber structure according to claim 6. False twisting involves applying a false twisting process that includes a heat-setting process to multiple multifilament yarns made only of organic fibers (but not including elastic yarns) to obtain two false-twisted yarns with twists in different directions. process and
A blending step of mixing one false twisted yarn, one false twisted yarn having a twist in the opposite direction, and an elastic yarn or metal fiber,
A method for producing a composite yarn, characterized in that the false twisting step and the blending step are performed continuously on the same machine.