Method for manufacturing industrial air-jet core yarn having excellent strength and friction resistance

Abstract

The present invention provides an air-jet core spun yarn by placing a high-strength long fiber filament as a core yarn and sheathing the core yarn with staple fibers composed of an industrial fiber material (aramid, PPS, PBI, etc.). According to the present invention, an air-jet core yarn can be provided that has excellent strength and uniformity compared with a ring spun yarn using 100% of industrial staple fibers such as aramid and has excellent friction resistance, preventing the staple fibers sheathing the core yarn from easily peeling off.

Description

Manufacturing method of industrial air jet core yarn with excellent strength and friction resistance

[0001] The present invention relates to a method for manufacturing an industrial airjet core yarn having excellent strength and friction resistance using an airjet spinning machine.

[0002] Industrial textile products are increasingly used in transportation, shipbuilding, and aviation, as well as in interior products such as furniture and awnings, heat-resistant protective clothing, cut-resistant sleeves, gloves, and building and civil engineering reinforcement materials. However, most industrial composite spun yarns are produced using the easy-to-manufacture ring-spun method. However, this involves numerous manufacturing steps, has low productivity, and utilizes 100% staple fibers, which generates a lot of hairiness in terms of yarn structure, leading to fibrillation and torsion, which can cause problems during downstream weaving and knitting. Furthermore, they offer lower strength compared to filament yarns. To overcome these issues, a ring-spun machine uses core yarns made of high-strength filaments as the core and covers the core with industrial staple fibers such as aramid. However, ring-spun core yarns have low friction resistance, and the covering fibers easily peel from the core filaments. This hinders their use as industrial spun yarns. Most ring-spun yarns are comprised of 100% staple fibers.

[0003] In comparison, the air jet spinning machine has a twisted structure that wraps the core rather than a twisted structure, so that the covering single fibers are tightly bound and do not easily peel off, and the process is simple and the productivity is high, so it is economical and the production speed is high. However, it has been difficult to form a twist that uniformly wraps the core filaments made of high-elasticity, high-strength fiber materials such as aramid and PPS, so it has been difficult to manufacture core yarns.

[0004] Therefore, the present invention has as its technical task a high-strength air-jet core yarn spun yarn that is not easily peeled off by friction by using a high-strength long fiber filament as a core and covering the core with a short fiber composed of an industrial fiber material (aramid, PPS, PBI, etc.).

[0005] Therefore, according to the present invention, a method for manufacturing an industrial air-jet core yarn having excellent strength and friction resistance is provided, characterized in that a glass fiber filament, a liquid crystal polymer filament, a stainless steel filament, a tungsten filament or a DTY thereof is used as a core, a sliver is manufactured from an aramid fiber, a polybenzimidazole (PBI) fiber, an oxidized pan fiber (Oxi-Pan), a polyphenylene sulfite fiber (PPS), an ultra-high molecular weight PE (UHMWPE) fiber or a mixed fiber thereof having a fiber length of 24 to 55 mm, and after a softening process, the sliver is supplied to a Murata vortex spinning machine to cover the core.

[0006] Hereinafter, the present invention will be described in more detail.

[0007] The present invention provides an air-jet sheath-core yarn (hereinafter referred to as air-jet core yarn) which uses a glass fiber filament, a liquid crystal polymer filament, a stainless steel filament, a tungsten filament or a DTY (draw textured yarn) thereof as a core, and covers the core filament using staple fibers composed of aramid fiber, polybenzimidazole (PBI) fiber, oxidized pan (Oxi-Pan) fiber, polyphenylene sulfite (PPS) fiber, ultra-high molecular weight PE (UHMWPE) fiber and mixed fibers thereof, which are high heat resistance and high elasticity fibers.

[0008] The filament used as a screening agent in the present invention is a high-strength or high-heat-resistant glass fiber filament, liquid crystal polymer filament, stainless steel filament, tungsten filament or DTY thereof, and has a tensile strength of 3.0 to 25 g / denier, an elongation of 2.0 to 20%, and a fineness of 50 to 500 denier.

[0009] The filaments used for the above screening are glass fiber or liquid crystal polymer filaments with little elongation, drawn approximately 0.75 to 0.85 times and inserted into the upper part of the front roller of the draft zone area of ​​an air jet spinning machine (Murata Vortex spinning machine) to form a core. If the draw ratio of the filaments in the screening section is less than 0.75 times, the screening section is likely to be exposed to the outside of the yarn, and if it exceeds 0.85 times, core formation is advantageous, but there is a problem that the filaments may break or the cover may peel off.

[0010] The fiber covering the above-mentioned screening is aramid fiber, polybenzimidazole (PBI) fiber, oxidized pan (Oxi-Pan) fiber, polyphenylene sulfite (PPS) fiber, ultra-high molecular weight PE (UHMWPE) fiber or a mixed fiber thereof. The raw material is opened and then supplied to a carding machine to remove impurities, short fibers and other foreign substances, and at the same time, the fibers are arranged in a row and made into slivers, which are supplied to the subsequent softening process to be drafted. The fiber covering the above-mentioned screening has a fiber length of 24 to 55 mm, a fineness of 1.0 to 3.0 denier and a strength of 2.0 to 25 g / denier, which is preferable for uniformly covering the screening.

[0011] In the soft-rolling process, a four-wire draft roller is used. In the present invention, the length of the fiber staple covering the above-mentioned screening is 24 to 55 mm, and the roller gauge is most appropriately set at 43 to 58 mm between the front and second rollers, 43 to 58 mm between the second and third rollers, and 46 to 60 mm between the third roller and the back roller. In order to improve the uniformity, doubling through the soft-rolling machine at least three times is required to obtain the best uniformity.

[0012] The above softened sliver is supplied to the draft section located above the nozzle of the Murata Vortex spinning machine and is drawn by the draft roller to reduce the fineness. The above draft section is a four-wire draft section, and the spacing between the front and second rollers is 44 to 52 mm, the spacing between the second and third rollers is 41 to 54 mm, and the spacing between the third roller and the back roller is 43 to 56 mm. It is preferable that the back draft be 2.0 to 3.5, the inter draft be 1.5 to 3.0, the main draft be 30 to 50, and the total draft be 150 to 400.

[0013] The Murata Vortex spinning machine uses a spindle with an air supply nozzle diameter of 0.6 mm, an air pressure of 0.6 Mpa, and a spindle hole diameter of 1.0 to 1.2 mm, and winds the filaments of the sliver drafted at a fiber supply speed of 350 to 480 m / min after covering the filaments.

[0014] The high-strength and high-elasticity fibers used for wrapping the core are, unlike conventional cotton or regenerated cellulose fibers, high in strength and elasticity. Therefore, increasing the amount of air supplied to impart twist improves the wrapping bonding force. In the case of cotton fibers, the wrapping bonding force is sufficient when the air supply per minute is 58ℓ / min, but for industrial fiber materials such as aramid, it must be increased to around 90-100ℓ / min to achieve uniform and sufficient wrapping bonding force. If it is lower than this, the short-fiber fibers covering the core are easily peeled off, and the strength is reduced. If it is higher than this, the wrapping bonding force is improved, but the feel of the spun yarn becomes hard, which deteriorates the feel of the final woven (knitted) fabric.

[0015] In order to increase the amount of air that gives twist to the yarn, the diameter of the air supply nozzle must be increased from 0.5 mm to 0.6 mm, and the air pressure must be increased proportionally as the diameter increases to achieve sufficient twist formation.

[0016] In the present invention, when forming the spun yarn, as illustrated in FIG. 1, a filament core portion (a) which is a core yarn in the middle of a core yarn (A) and a covering portion (b) which wraps around the outer periphery of the core portion are formed in the direction of the spun yarn progression. The filament supply device which is the core portion is composed of a filament creel (16), an anti-sag device (18), a filament travel detection sensor (19), a tension portion (20), and an insertion guide (21) as illustrated in FIG. 2. The filament (17) is supplied from the filament creel (1), passes through the anti-sag device (18) which prevents the filament from fraying when cutting, and then receives a tension set in the tension portion (20) and is then inserted into the front roller (5) of the draft area of ​​the Murata Vortex spinning machine through the path of the filament insertion guide (21). In order to keep the filaments of the screening section in the center of the yarn, the tension between the front roller (5) and the feed roller (8) in the draft area specified in Fig. 3, the feed ratio, is appropriately in the range of 1.05 to 1.15. When the feed ratio is less than 1.05, the core section is easily exposed to the outside of the yarn, but there are advantages of uniformity and fewer defects, and when the feed ratio exceeds 1.15, the core section is located in the center of the yarn, but there are disadvantages of easy peeling of the covering section and poor uniformity.

[0017] The fibers of the covering portion will be described as follows by citing the drawings and description of the invention in European Patent Application No. 03005279.9 (filed on March 10, 2003) of the manufacturer of the Murata Vortex spinning machine. The Murata Vortex spinning machine used in the present invention is composed of a sliver (1), a back roller (2), a 3° roller (3), a 2° roller (4), a front roller (5), a nozzle (6), a spun yarn (7), a nip roller (8), a feed roller (9), a clear section (10), and a spun yarn package (11), as illustrated in Fig. 2.

[0018] As described above, fibers passing through the draft section are formed into yarns within the nozzle (6) of Fig. 2, and the yarn formation process is described with reference to Fig. 3. The fibers are guided to the guide hole (13a) by the suction fluid generated near the fiber guide block (13) by the air current injected from the air nozzle hole (14b) within the nozzle member (14), and the fibers are supplied along the periphery of the needle (13b) and enter the spinning chamber (14a).

[0019] Afterwards, the fibers are sucked into the spinning chamber (14a) and injected from the air nozzle hole (14b) and subjected to the action of the swirling air current around the spindle (15a) located at the top of the hollow guide rod (15). Some fibers are sucked straight into the hole of the spindle (15a), and some fibers are separated and come out of the hole of the spindle (15a) and wrap around the outer periphery of the spindle (15a) at the top of the hollow guide rod (15).

[0020] The fibers wrapping around the outer circumference of the spindle (15a) are twisted in the direction of the swirling air current and wrap around the outer circumference of the spun yarn that has advanced into the hole of the spindle (15a). Furthermore, a portion of the twisted portion is about to be propagated to the front roller (5) by the swirling air current. The needle (13b) acts to block the propagation phenomenon in order to prevent the fibers supplied from the front roller (5) from being twisted by the twist.

[0021] Fibers twisted by the swirling air current are formed into twisted yarns, forming core fibers and wrapping fibers. The yarns pass through the yarn passage (15b) inside the spindle (15) and are discharged through the yarn discharge port (15c).

[0022] Therefore, according to the present invention, it is possible to provide an air jet core yarn having superior strength and uniformity compared to a ring spun yarn made entirely of industrial staple fibers such as aramid, and having excellent friction resistance in which the staple fibers covering the core do not easily peel off.

[0023] Figure 1 is a diagram schematically illustrating the shape of the air jet core of the present invention.

[0024] Figure 2 is a schematic diagram showing the manufacturing process of air jet core yarn.

[0025] Figure 3 is a cross-sectional view showing the nozzle structure of a Murata Vortex spinning machine used to manufacture air jet core yarn.

[0026] The following examples provide non-limiting examples of a method for manufacturing an industrial air jet core yarn having high strength and excellent friction resistance according to the present invention.

[0027] [Example 1]

[0028] The fiber of the covering part is para-Aramid staple fiber with a fiber length of 51 mm, a strength of 18.0 g / d, and an elongation of 3%. It is supplied to a carding machine, carded to remove impurities, short fibers, and other foreign substances, and at the same time, the tows are arranged in a row and made into slivers. After that, it is supplied to the softening process, which is a post-process, and a soft sliver with a count of 0.14 is prepared through drafting. The fiber of the core part was prepared as 100 Denier Glass Filament and supplied to the feeder of the core part of a Murata Vortex spinning machine to give the filament a draw ratio of 0.80 and a feed ratio of 1.05, and passed through a draft part with a 4-wire draft part having a roller gauge of 52×54×56 (mm), a back draft of 3.0, an inter draft of 2.0, a main draft of 33, and a total draft of 197, and then drawn, and then spun at 400 m / min with a ceramic nozzle having a spindle hole diameter of 1.2 mm, and then wound to produce an air-jet core yarn having a Ne count of 20.

[0029] [Example 2]

[0030] The fiber of the covering part was prepared as a mixed soft sliver with a weight ratio of 55 / 45 using para-Aramid raw material with a fiber length of 51 mm, a strength of 18.0 g / d, and an elongation of 3% and polybenzimidazole (PBI) fiber with a fiber length of 51 mm, a strength of 3.7 g / d, and an elongation of 12%. The core part used 50 Denier Glass Filament and supplied it to the core part feeding device of Murata Vortex spinning machine to give the filament a draw ratio of 0.80 and a feed ratio of 1.05, and then passed through the draft part with a 4-wire draft part having a roller gauge of 54×56×56 (mm), a back draft of 3.0, an inter draft of 2.0, a main draft of 49, and a total draft of 300, and then drawn at 450 m / min with a ceramic nozzle with a spindle hole diameter of 1.2 mm. After forming the spun yarn, it was wound to produce an air jet core yarn.

[0031] [Comparative Example 1]

[0032] For comparison with Example 1, 100% short-fiber spun yarn was produced using ring-spun yarn, which is a general spun yarn. After going through the same carding and drawing processes with the para-Aramid fiber material, which is the covering fiber used in Example 1, and going through a three-wire roving process, ring-spun yarn was produced with the same thickness as Example 1 at a ring spindle RPM of 10,000 and TM of 4.5.

[0033] Classification Strength (cN) Elongation (%) Mou (H) Coverage Example 113482.525.1095% Comparative Example 112153.127.8575% Example 27302.654.6295%

[0034] The present invention relates to an air-jet core yarn spun using a high-strength long fiber filament as a core and covering the core with staple fibers composed of industrial fiber materials (aramid, PPS, PBI, etc.). According to the present invention, an air-jet core yarn having superior strength and uniformity and excellent friction resistance in which staple fibers covering the core are not easily peeled off can be provided compared to a ring-spun yarn using 100% industrial staple fibers such as aramid.

Claims

1. A method for manufacturing an industrial air-jet core yarn having excellent strength and friction resistance, characterized in that the method comprises manufacturing a sliver using a glass fiber filament, a liquid crystal polymer filament, a stainless steel filament, a tungsten filament or a DTY thereof as a core, and aramid fiber, polybenzimidazole (PBI) fiber, oxidized pan (Oxi-Pan) fiber, polyphenylene sulfite (PPS) fiber, ultra-high molecular weight PE (UHMWPE) fiber or a mixed fiber thereof with a fiber length of 24 to 55 mm, subjecting the sliver to a softening process, and then supplying the sliver to a Murata vortex spinning machine to cover the core.

2. In paragraph 1, A method for manufacturing an industrial air jet core yarn having excellent strength and friction resistance, characterized in that the above examination is performed by elongating the yarn by 0.75 to 0.85 times and the feed ratio, which is the tension between the front roller and the feed roller of a Murata vortex spinning machine, is 1.05 to 1.

15.

3. In paragraph 1, The above test is a method for manufacturing an industrial air jet core yarn with excellent strength and friction resistance, characterized by a tensile strength of 3.0 to 25 g / denier, an elongation of 2.0 to 20%, and a fineness of 50 to 500 denier.

4. In paragraph 1, A method for manufacturing an industrial air jet core yarn having excellent strength and friction resistance, characterized in that the fiber material of the above sliver is aramid fiber, polybenzimidazole (PBI) fiber, oxidized pan (Oxi-Pan) fiber, polyphenylene sulfite (PPS) fiber, ultra-high molecular weight PE (UHMWPE) fiber or a mixed fiber thereof, and has a fiber length of 24 to 55 mm, a fineness of 1.0 to 3.0 denier, and a strength of 2.0 to 25 g / denier.

5. In paragraph 1, A method for manufacturing an industrial air jet core yarn having excellent strength and friction resistance, characterized in that the draft section of the above Murata vortex spinning machine is a four-wire draft section, the spacing between the front and second rollers is 44 to 52 mm, the spacing between the second and third rollers is 41 to 54 mm, the spacing between the third roller and the back roller is 43 to 56 mm, the back draft is 2.0 to 3.5, the inter draft is 1.5 to 3.0, the main draft is 30 to 50, and the total draft is 150 to 400.

6. In paragraph 1, A method for manufacturing an industrial air jet core yarn having excellent strength and friction resistance, characterized in that when the above sliver is supplied to a Murata Vortex spinning machine and covered with a core, the air supply per minute of the spinning machine is 90 to 100 ℓ / min.

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