KR101618789B1 - Process Of Producing Long Staple Aramid Fiber AirJet Yarn Having Excellent Uniformity Stress And Strain Friction Resistance - Google Patents

Abstract

The present invention relates to a method for producing an aramid air jet mixed yarn containing a long fiber aramid fiber and a long fiber aramid fiber of at least 48 mm in length. The present invention provides a method for producing aramid fiber, Aramid spun yarn and composite spun yarn which are excellent in appearance, high strength, and friction resistance by complementing monotonousness of appearance, touch, appearance pattern, etc., and additionally have excellent hygroscopicity, quick drying property and high- A composite yarn can be provided.

Description

Technical Field [0001] The present invention relates to a process for producing a long-fiber aramid air jet yarn excellent in uniformity, strength, and abrasion resistance,

The present invention relates to a method for producing an aramid air jet yarn containing aramid fiber as an essential component.

Aramid is a generic name of Aromatic Polyamide fiber, which is a synthetic polyamide with long chain-like structure composed of at least 85% of amide bonds directly attached to two aromatic rings. Is defined. Aramid is a nylon-based polymer used in fiber form.

The aramid fiber is largely classified into para aramid fiber and meta aramid fiber depending on the bonding position of the amide group and the benzene ring, and the para-aramid fiber is divided into the polymer and the co-polymer. It has a high strength and a high elastic modulus, and the meta system is characterized by excellent thermal stability.

Among these, the meta-based aramid is a fiber made from a polymer linked to the amide group at the meta position and having a melting point of 320 ° C and is excellent in heat resistance, flame retardancy and flame resistance, and is used in aircraft interiors, military and civilian protective clothing, industrial filter materials, Pajamas, cubicle curtains, pillows, and work clothes for general consumers. Nomex of DuPont, Gonnex of Teijin, and Fhenylon of Russia are the trade names. Meta-based aramid fibers have been widely used for protective clothing such as fire-fighting clothing because of their excellent heat resistance, flame retardancy, chemical resistance and radiation resistance. However, due to the dense structure of strong molecular structure and high crystallinity, The hairiness is high, which causes pilling, which may reduce efficiency in the post-processing (weaving, knitting).

The production of the aramid yarn by ring spinning is performed by parallelizing the fibers and twisting by the rotation of the traveler to generate a large number of moths on the surface of the aramid yarn, thereby causing disadvantages such as appearance and gloss drop of the knitted fabric, .

Therefore, the present invention solves the problems of the prior art, thereby maximizing the performance of the aramid fiber, improving the mowing and peeling which is a disadvantage of the ring spun yarn, and using a long staple of 48 mm or more, And an aramid yarn excellent in abrasion resistance.

Therefore, according to the present invention, a sliver of an aramid fiber having a filament length of 48 to 55 mm is prepared and subjected to a softening process, and then the sliver is supplied to a Murata vortex spinning machine to be drawn through a draft part made of a draft roller, A yarn having a uniformity, a strength and an excellent resistance to abrasion is formed using a nozzle having a diameter of 0.9 to 1.4 mm at an air pressure of 4.5 to 6.5 kg / cm 2 at a discharge speed of 200 to 450 m / A method for producing a spinning yarn is provided.

Further, according to the present invention, there is provided a yarn comprising a core portion made of aramid fiber having a fiber length of 48 to 55 mm and having fibers arranged in the yarn advancing direction, and a fiber portion surrounding the outer periphery of the core portion. This superior aramid air jet yarn is provided.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a method for producing a laminate film by using a Murata Vortex spinning machine using ceramic nozzles and using only aramid fibers having a fiber length of 48 to 55 mm or mixing aramid fibers with flame retardant rayon fiber, modacrylic fiber, antistatic fiber or cellulose fiber A core portion having fibers arranged in the yarn advancing direction, and a portion of the core portion surrounding the outer periphery of the core portion. The present invention relates to a method for producing an aramid air jet yarn excellent in uniformity, strength and frictional resistance, and an aramid air jet yarn .

The method for producing an aramid air jet yarn excellent in external uniformity, strength and frictional resistance according to the present invention is characterized in that a yarn fiber cut to a length of 48 to 55 mm in length is carded and fused to produce a sliver, After the fineness of the sliver is lowered, the yarn is supplied to a Murata Vortex spinning machine equipped with an air nozzle to form a spinning yarn and then wound.

First, the raw yarn of the aramid air jet mixed yarn of the present invention contains aramid fiber having a fiber length of 48 to 55 mm or aramid fiber having a filament length of 48 to 55 mm as essential yarns, and is preferably a flame retardant rayon fiber, modacrylic fiber, Fibers and cellulose fibers are mixed and used. The fibers are used as staple fibers or tows by cutting the filaments.

The aramid fiber used in the present invention is a meta-aramid fiber or para-aramid fiber having a fiber fineness of 1.0 to 3.0 dpf, a fiber length of 48 to 55 mm, a strength of 4 to 7 g / d, an elongation of 20 to 40% Aramid fiber has a fiber fineness of 1.0 to 2.0 dpf, a fiber length of 48 to 55 mm, a strength of 18 to 25 g / d, and an elongation of 1 to 5%. The flame retardant rayon fiber has a fiber fineness of 1.0 to 2.0 dpf, A fiber length of 48 to 55 mm, a strength of 2.3 to 3.0 g / d, an elongation of 20 to 55 mm, an elongation of 1.5 to 3.0 g / d, and an elongation of 8 to 20%. The modacrylic fiber has a fiber fineness of 1.0 to 3.0 dpf, Wherein the cellulose fibers have a fiber fineness of 1.1 to 3.0 dpf, and the cellulose fibers have a fiber fineness of 2.0 to 6.0 dpf, a fiber length of 35 to 77 mm, a strength of 1.5 to 5.5 g / d, and an elongation of 30 to 60% It is preferable that the fiber length is from 48 to 55 mm, the strength is from 2.0 to 4.0 g / d, the elongation is from 5 to 15%, and the composition ratio of the aramid fiber in the whole yarn is 20 to 95% It provides.

The antistatic fiber may be a conductive material such as nylon or a conductive material such as carbon fiber capable of flowing electric current at the center of the acrylic fiber, such as Belltron manufactured by KANEBO Corporation.

The fibers were cut to a fiber length of 48 to 55 mm to obtain the best yarn strength, and in particular, the stretch and uniformity were good. Cloth and clothes made of air jet yarn made of such staples of 48 to 55 mm It not only protects the human body against exposure to heat but also possesses high strength properties, excellent drafting, clean appearance, and peeling in repeated washing can be prevented.

The prepared staple fibers having a length of 48 to 55 mm were sufficiently aged and opened and then fed to a cotton machine to remove impurities, staple fibers and other fibers. The staple fibers were arranged in a line and made into slivers, It is supplied to the soft process and drafted.

In the present invention, a yarn of 100% by weight of aramid fiber can be produced, but an aramid fiber is required depending on the purpose of use, and further mixing of any one of flame retarding rayon fiber, modacrylic fiber, antistatic fiber and cellulose fiber can be performed . It is preferable for the sliver of the aramid fiber to mix at least one of flame retardant rayon fiber, modacrylic fiber, anti-static fiber and cellulose fiber to the aramid fiber at the raw material stage for homogeneous blending of the raw fiber. In some cases, the sliver may be mixed by further mixing and softening the sliver of any one of fire retardant rayon fiber, modacrylic fiber, antistatic fiber and cellulose fiber to the aramid fiber during the softening process.

Three-berth and four-wire types are commonly used in the soft roll process. In the three berth drafting method, a fiber pulling phenomenon occurs somewhat in a bottom roller, and a four-wire drafting method is used in the present invention. The length of the fiber fiber staple used in the present invention is 48 to 55 mm, which is considerably longer than that of the plain or polyester staple 27 to 40 mm. Therefore, the roller gauge is spaced from the front roller to the second roller by 52 to 60 mm, The gap between the 3rd roller is 52-58mm, the gap between 3rd roller and back roller is 52-60mm most suitable, and even when using the 3-wire draft method, it is the same as the 4-line roller gap. In order to improve uniformity, double-ringing should be performed through at least two openings, and the best uniformity can be obtained after three openings. Doubling is sufficient for 6 to 8 strands of sliver, with a back draft of 1.2 to 2.0, an interdraft of 1.0 to 2.0, and a total draft of 5.0 to 10.0, minimizing the floating of the sliver and improving uniformity.

 The softened sliver is supplied to a draft portion located at the upper end of the nozzle of the Murata Vortex spinning machine, and is drawn by a draft roller to reduce the fineness. The draft section is a four-wire draft section. The interval between the front and second rollers is 54 to 62 mm. The interval between the second and third rollers is 52 to 58 mm. The interval between the third roller and the back roller is 52 to 62 mm. It is preferable that the draft is 1.5 to 2.0, the main draft is 20 to 50, and the total draft is 100 to 300.

The roller gauge of the draft part is determined by the fiber length of the source yarn, the draft size, the sliver thickness, and the physical properties of the yarn fiber, and should be determined within a range in which the occurrence of floating fibers is small and the severing of the long fibers is minimized. It is also important to determine the size of the roller gauge and draft because the aramid fiber has a high vulcanizing ability and low fiber coverage. In the case of the aramid fiber having a fiber length of 48 to 55 mm, the gap between the 3rd roller and the back roller is set to be slightly larger than the fiber length as a preliminary draft zone before the main draft, so that the resistance of the fiber is minimized and the second roller and the 3rd roller are interdrafted Reducing the spacing of the rollers, and setting the fiber between the front roller and the second roller on which the main draft acts, and setting the fiber somewhat wider than the fiber sheet due to the installation of the apron, which leads the fibers to the front roller, can provide a uniform yarn have.

In the present invention, the staple fiber used as the raw material of the aramid air jet spun yarn is a fiber having a length of 48 to 55 mm. Since the long fiber has a high strength and a low blending force due to the flexibility of the fiber, In the zone, control of the fiber is difficult and the uniformity is reduced, and incomplete drafting in the draft zone may cause defects in the yarn yarns and may cause the fabric to deteriorate.

In the present invention, in order to prevent incomplete drafting in the draft zone, an apron tension bar located between the front roller and the second roller is used in a length of 38 to 42 mm in the conventional 28 mm form, and a length of 43.4 The bottom apron with a width of 32 mm to 36 mm and a thickness of 0.8 mm to 1.2 mm is used and a top cradle having a length of 30 mm to 34 mm is used with a conventional 20 mm. The top apron also has a length of 41.8 to 45.8 mm , A width of 30 to 34 mm, and a thickness of 0.8 to 1.2 mm is used, the resistance of the long fiber is minimized and a uniform yarn can be obtained.

As described above, the fineness is lowered in the draft unit, the fibers are straightened and parallelized, and the fibers are supplied to the ceramic spindle nozzle of the Murata Vortex spinning machine of the present invention.

Hereinafter, the drawings of the European patent application No. 03005279.9 (filed on March 10, 2003) of the maker of Murata Vortex spinning machine and the description of the invention will be described with reference to the drawings. The Murata Vortex spinning machine used in the present invention is constituted by a sliver 1, a back roller 2, a 3 ° roller 3, a 2 ° roller 4, a front roller 5, a nozzle 6, the spinning yarn 7, the nip roller 8, the feed roller 9, the clear portion 10 and the yarn package 11, and the drawing operation in the draft portion has been described above.

The fibers passing through the draft portion as described above are formed into yarns in the nozzle 6 of FIG. 1. The yarn forming process will be described with reference to FIG. The fibers are guided to the guide hole 13a by the suction fluid generated in the vicinity of the fiber guide block 13 by the airflow injected from the nozzle hole 14b in the nozzle member 14 and the fibers are guided to the periphery of the needle 13b And enters the spinning chamber 14a.

The fiber is sucked into the spinning chamber 14a and injected from the nozzle hole 14b to be subjected to the action of an air current swirling around the tip portion 15a of the hollow guide rod 15. [ Some of the fibers separated from the fibers may be turned upside down and may wrap the periphery of the tip portion 15a of the hollow guide rod 15. [

Moreover, the fibers swing around the formed yarn and wrap the outer circumference of the yarn. The fibers are twisted in the direction of the swirling air current. Furthermore, a part of the twisted portion tends to be propagated to the front roller 5 by the swirling airflow. The needle 13b serves to prevent the propagation phenomenon in order to prevent the fibers supplied from the front roller 5 from being twisted by the twist.

Fibers twisted by a swirling air current are formed by twisted yarns and form a core fiber and a wrapping fiber. The yarn yarn passes through the spinning yarn passage 15b inside the hollow guide rod 15 and is discharged through the yarn yarn discharging port 15c.

In the present invention, the nozzle 6 is made of a ceramic nozzle having a nozzle diameter of 0.9 to 1.4 mm, thereby increasing the gathering power of the fiber in the yarn fiber and wrapping the fiber of the core portion without the twist in the wrapping fiber, Good. When the nozzle diameter is less than 0.9 mm, the tactile feel of the spinning yarn is deteriorated. When the diameter is more than 1.4 mm, incomplete twist formation occurs.

The air pressure of the nozzle should be 4.5 to 6.5 kg / cm 2. If the air pressure is less than 4.5 kg / cm 2, the strength of the spun yarn is lowered, and if it exceeds 6.5 kg / cm 2, the feel of the yarn may be deteriorated. The feed rate should be 200 to 450 m / min. When the feed rate is less than 200 m / min, the number of fibers to be wrapped increases and the yarn is hard and easily broken. When the feed rate is more than 450 m / min, Lt; / RTI >

The essential aramid fiber of the aramid air jet yarn of the present invention is treated with an antistatic agent (emulsion OPU 0.5 to 0.8%) 5 times as high as the polyester in the fiber due to the static electricity problem due to the fiber property, The yarn twist formation becomes incomplete in the yarn, resulting in deterioration of the yarn resistance. That is, the fiber treated emulsion contaminates the nozzle, the most sensitive part of the air jet spinning, and the contaminated nozzle may disturb the airflow of the air forming the kink, making the spinning itself impossible.

Therefore, in order to solve this problem, when the OPU of the aramid fiber itself is lowered to the level of 0.15% of the general polyester level, the web is curled due to the static electricity in the soffit process, The minimum level of 0.3% OPU that will not cause any problem in the process will be 0.3% but even if the OPU is 0.3%, it may become impossible to spin due to deterioration of flammability due to nozzle pollution. Therefore, in order to form a sufficient twist in the air jet spinning machine while using an aramid fiber treated with a conventional emulsion content, in the present invention, a mixture of water and a nonionic surfactant is sprayed to the supplied compressed air, It is possible to improve the anti-scattering property.

The yarn 7 thus formed passes through the clear portion 10 between the nip roller 8 and the delivery roller 9 of Fig. 1 to remove the non-spinning fiber, Is wound.

The present invention is characterized in that the core portion is made of aramid fiber having a fiber length of 48 to 55 mm and the fibers are arranged in the yarn advancing direction and a part of the outer periphery of the core portion is wrapped around the core portion. An air jet yarn is provided. Further, the aramid air jet spinning yarn is mixed with at least one of flame retardant rayon fiber, modacrylic fiber, antistatic fiber and cellulose fiber by mixing in a horn face or a soft-kneading process. Excellent aramid air jet yarns can be provided.

The aramid air jet yarn has a uniformity of 10 to 40, a strength of 16 to 25 cN / tex, an elongation of 8.0 to 20.0% and a uniformity (U%) of 10.0 to 13.0% Compared to a spun yarn, the mow is reduced by 90%, the appearance is clean and the friction resistance is excellent.

Therefore, according to the present invention, it is possible to provide an aramid air jet yarn excellent in uniformity, strength, and frictional resistance by maximizing the performance possessed by the aramid fiber and compensating for the disadvantages of the aramid fiber such as stretchability, And additionally provides an aramid yarn excellent in flame retardance, hygroscopicity, and heat retention and functionality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of a Murata Vortex spinning machine used for producing an aramid air jet yarn of the present invention. FIG.
2 is a cross-sectional view showing a nozzle structure of a Murata Vortex spinning machine used for producing an aramid air jet yarn of the present invention.
3 is an external view of an aramid air jet yarn of Example 1 of the present invention,
4 is an external view of an aramid air jet yarn of Example 2 of the present invention,
5 is an external view of an aramid air jet yarn of Example 3 of the present invention,
6 is an external view of a conventional aramid ring spun yarn.

The following Examples are non-limiting examples of the process for producing an aramid air jet mixed yarn excellent in appearance and resistance to abrasion of the present invention.

[Example 1]

A para-aramid fiber having a fiber fineness of 1.5 dpf, a fiber length of 51 mm, a strength of 4.5 g / d, an elongation of 35%, a meta-aramid fiber of 1.5 dpf, a fiber length of 51 mm, a strength of 23 g / The tows were arranged in a line and slivers were formed. The sludge was fed to a soft process, which was a post-process, and mixed with the mixture at the mixing ratio shown in Table 1, Were prepared. The prepared softness sliver was supplied to Murata Vortex spinning machine, and the roller gauge was 56 × 54 × 56 (mm) as a four-wire draft part. The draft was passed through the draft section of the back draft 3.0, the intermediate draft 2.0 and the main draft 32 Thereafter, air containing a mixture of water and a nonionic surfactant was sprayed at a pressure of 5.5 kg / cm 2 with a ceramic nozzle having a nozzle diameter of 1.0 mm to form a spun yarn at a discharge speed of 350 m / min, 1 < / RTI > was prepared.

[Example 2]

An aramid air jet mixed yarn was produced in the same manner as in Example 1, except that the yarn fibers were fumed as shown in Table 1 below

[Example 3]

Aramid fiber 1.5 dpf having a fiber length of 1.5 dpf, a fiber length of 51 mm, a strength of 5.0 g / d and an elongation of 35%, a para-aramid fiber 1.5 dpf having a fiber length of 51 mm, a strength of 23 g / A modacrylic fiber having a fiber length of 51 mm, a strength of 3.4 g / d and an elongation of 34%, a static fiber having a fiber size of 2.0 dpf and a fiber length of 51 mm, a fiber length of 51 mm, a strength of 3.5 g / Aramid air jet mixed yarns were prepared in the same manner as in Example 1, except that the anti-fouling fibers (Beltron, manufactured by KANEBO Co., Ltd.) were used and fumed as shown in Table 1 below.

The physical properties of the air jet yarns of Examples 1 to 3 were measured and are shown in Table 1 below. In the case of Example 3, the uniformity measurement was impossible because of the use of the antistatic fiber having the carbon fibers formed therein.

division Example 1 Example 2 Example 3 Mixed rate
(weight%) m-aramid / p-aramid
(95/5) m-aramid
(100) Modacrylic / tencel / m-aramid / antistatic fiber (43/30/25/2) Nec 30 30 30 Actual count 29.1 29.2 29.7 Number CV% 1.15 1.20 1.15 Strong (cN / tex) 18.03 20.38 18.5 Shinto (%) 14.4 16.26 13.0 Uniformity (U%) 11.1 11.32 Thin place
(EA / km) 10 3 Thick place
(EA / km) 42 34 Nep place
(EA / km) 25 25 Hairness S3 21 12

1: Sliver 2: Back roller
3: 3 ° roller 4: 2 ° roller
5: front roller 6: nozzle
7: Spunlace yarn 8: Nip roller
9: Feed roller 10: Clear part
11: yarn package 13: fiber guide block
13a: Induction hole 13b: Needle
14: nozzle member 14a: spinning chamber
14b: nozzle hole 15: hollow guide rod
15a: tip portion 15b: yarn passage
15c: yarn discharge port

Claims (10)

A sliver of an aramid fiber having a fiber length of 48 to 55 mm was prepared and subjected to a softening process,
The roller gauge is 54 to 62 x 52 to 58 x 52 to 62 (mm) as a four-wire draft unit made of draft rollers by supplying the sliver to a Murata vortex spinning machine, and a length of 38 to 42 mm A bottom apron having a length of 43.4 to 47.4 mm, a width of 32 to 36 mm and a thickness of 0.8 to 1.2 mm and a top cradle of 30 to 34 mm, a length of 41.8 to 45.8 mm, a width of 30 to 34 mm, a thickness of 0.8 to 1.2 mm mm is used as a top apron and the drawn draft is 2.8 to 4.0, Inter Draft is 1.5 to 2.0, main draft is 20 to 50, and the total draft is drawn through a draft portion of 100 to 300,
A yarn having a uniformity, a strength and an excellent frictional resistance is formed by forming a spun yarn at an air pressure of 4.5 to 6.5 kg / cm 2 and a delivery speed of 200 to 450 m / min using a nozzle having a nozzle diameter of 0.9 to 1.4 mm. Method of manufacturing an air jet yarn. The method according to claim 1,
Characterized in that the sliver of the aramid fiber is further mixed with at least one fiber selected from flame retardant rayon fiber, modacrylic fiber, anti-static fiber and cellulose fiber to the aramid fiber in the raw material step. A method for producing an aramid air jet yarn. The method according to claim 1,
Characterized in that at least one sliver of at least one of fire retardant rayon fiber, modacrylic fiber, antistatic fiber and cellulose fiber is further added to the aramid fiber during the softening process to soften the aramid fiber, and the aramid air jet spinning yarn ≪ / RTI > The method according to claim 1,
Wherein the aramid fiber is a meta-aramid fiber or a para-aramid fiber and has a fiber fineness of 1.0 to 3.0 dpf, a fiber length of 48 to 55 mm, an intensity of 4 to 7 g / d and an elongation of 20 to 40% Wherein the aramid fiber has a fiber fineness of 1.0 to 2.0 dpf, a fiber length of 48 to 55 mm, an elongation of 18 to 25 g / d, and an elongation of 1 to 5%, wherein the aramid fiber is excellent in strength, strength and frictional resistance. The method according to claim 2 or 3,
The fire retardant rayon fiber has a fiber fineness of 1.0 to 2.0 dpf, a fiber length of 48 to 51 mm, a strength of 1.5 to 3.0 g / d, and an elongation of 8 to 20%
The modacrylite fiber had a fiber fineness of 1.0 to 3.0 dpf, a fiber length of 48 to 55 mm, a strength of 2.3 to 3.0 g / d, and an elongation of 20 to 38%
The antistatic fiber has a fiber fineness of 2.0 to 6.0 dpf, a fiber length of 33 to 77 mm, a strength of 1.5 to 5.5 g / d, and an elongation of 30 to 60%
The cellulose fibers have a fiber fineness of 1.1 to 3.0 dpf, a fiber length of 48 to 55 mm, a strength of 2.0 to 4.0 g / d, and an elongation of 5 to 15%
Wherein the composition ratio of the aramid fibers in the whole spinning yarn is 20 to 95% by weight based on the total weight of the aramid yarn. delete The method according to claim 1,
Wherein the air supplied to the spindle nozzle of the Murata Vortex spinning machine contains a mixture of water and a nonionic surfactant, wherein the air contains a mixture of water and a nonionic surfactant. delete delete delete

Images