KR102403772B1 - Manufacturing Method Of Modacrylic/Tencell Airjet Spun Yarn Having Excellent Fire Retardant - Google Patents

Abstract

The present invention relates to a method for manufacturing modacrylic-Tencel air-jet spun yarn containing a modacrylic fiber and a Tencel fiber. According to the present invention, it is possible to provide a composite spun yarn which has same uniformity by air-jet spinning while allowing the flame-retardant performance thereof to be maximized. The composite spun yarn exhibits a flame-retardant performance and tensile strength through the modacrylic fiber contained therein, and suppresses the afterglow time, the afterflame time, and the formation of burn holes and sparks in the event of fire through the Tencel fiber contained therein. Therefore, the modacrylic-Tencel air-jet spun yarn of the present invention can be used for manufacturing fabrics of protective clothing such as protective clothing for electric arc welding, workwear for electricians, and firefighter clothing.

Description

Manufacturing Method Of Modacrylic/Tencell Airjet Spun Yarn Having Excellent Fire Retardant

The present invention relates to a method for producing a modacrylic/tencel air jet mixed spun yarn containing modacrylic fiber and tencel fiber.

Safety work clothes worn by workers in industrial fields require high strength, heat resistance and chemical resistance. For example, body armor used in hazardous applications, industrial overalls, fire fighting suits and military protective clothing are made of fabrics woven from threads of non-synthetic fibers, such as cotton or wool, and then these fabrics are made of conventional halogen and phosphorus or fire-resistance based fabrics based on one of them. The zero treatment was used, but these work clothes had limited activity and were heavier than typical non-heat resistant fabrics.

Among the industrial safety work clothes, in particular, welding clothes worn during welding work belong to work clothes that require more heat resistance and flame retardancy. In particular, during arc welding, many sparks are generated during the welding process, and there are always danger factors such as electric shock, high temperature heat generated during welding, and unexpected external impact in the workplace.

In addition, when an electric arc occurs during electrical construction, it generates a shock wave and strong radiant heat along with a strong explosion to melt the metal. .

In order to protect workers from these dangers, they wear welding gear such as welding clothes, welding masks, and welding gloves. more important than Conventional welding clothes were made of animal skins. As such, welding clothes made of leather are easily shriveled or lost by high-temperature heat when sparks splash during welding, and are heavy and inconvenient, and there is a problem that there is no ventilation. .

Recently, we have developed welding suits made by mixing high-strength and heat-resistant fibers of para-aramid, meta-aramid, carbonized fibers, and PBO with excellent non-combustibility and heat resistance and conductive yarn. It is effective in suppressing the spread of fire due to its excellent conductivity and flame retardancy that can suppress spark generation, but the part exposed to the fire melts and falls into sparks, which can cause a secondary fire. It has a potential threat of causing burns to the body of the worker.

In addition, the para-aramid, meta-aramid, carbonized fiber, and PBO high-strength and high heat-resistance fibers are expensive fiber materials. It is difficult to provide in a variety of ways.

Republic of Korea Patent Registration No. 10-2178586 (Notice on November 16, 2020)

Therefore, in the present invention, modacrylic fiber that can solve the burdensome price side by replacing the existing expensive high strength and high heat resistance fiber by solving the problems of the prior art, and applying natural material Tencel fiber By mixing modacrylic fiber and tencel fiber in the directly exposed part, the flame retardant performance by modacrylic fiber is excellent and before being melted by the tencel fiber in the carbonized part It is a technical task to provide a composite spun yarn having excellent flame retardancy that can prevent the occurrence of secondary fire accidents and heat resistance that can prevent falling sparks or puncture by melting by making it completely carbonized.

Therefore, according to the present invention, a honta-myeon process of mixing modacrylic fiber and tencel fiber;

a carding process of manufacturing slivers by combing the fibers;

a softening process of drafting the sliver; and

The sliver is supplied to a Murata Vortex spinning machine and stretched through a draft part made of a draft roller, and then, using a nozzle with a nozzle diameter of 1.1 to 1.3 mm, an air pressure of 0.4 to 0.5 kg/cm2, and a delivery speed of 300 to 400 m/min There is provided a method for producing a modacrylic / Tencel air jet mixed spun yarn with excellent flame retardancy, characterized in that it consists of a spinning process of winding after forming a spun yarn with a spun yarn.

Hereinafter, the present invention will be described in detail.

The present invention is an invention of manufacturing an air jet mixed spun yarn using a murata vortex spinning machine after selecting a blend ratio with the maximum functionality using modacrylic and tencel fibers.

The manufacturing method of the modacrylic / Tencel air jet mixed spun yarn of the present invention is a honta cotton process of mixing the yarn fibers cut to a certain length, a carding process to produce sliver, a softening process, and supply to a Murata Vortex spinning machine after trafting After forming the spun yarn, it proceeds in the order of the spinning process of winding.

First, the yarn of the modacrylic / tencel air jet mixed spun yarn of the present invention is used by mixing modacrylic fiber and tencel fiber. .

The modacrylic fiber used in the present invention has a fiber fineness of 1.0 to 2.0 dtex and a fiber length of 45 to 54 mm, and the tencel fiber has a fiber fineness of 1.0 to 2.0 dtex and a fiber length of 45 to 54 mm. The fibers are cut so that the fiber length is 45 to 54 mm, and the spinning property is good and the uniformity is excellent. In particular, it is preferable to ensure that the fiber length of the raw material fiber is 45 to 54 mm and the more the mixed spinning is performed, the more uniform fineness and excellent uniformity of the blended yarn can be secured.

In particular, the modacrylic fiber improves the tensile strength of the spun yarn and imparts flame retardant performance, and the tencel fiber is characterized by an excellent touch feeling and price reduction effect utilizing the characteristics of natural materials, and compared to synthetic fibers when exposed to fire. It is characterized by rapid carbonization, so it melts and prevents sparks from falling.

The optimal blending ratio of modacrylic fiber and tencel fiber in all spun yarns is 65:35~95:5. If it exceeds, the flame retardancy and tensile strength are excellent, but when exposed to a fire site, when exposed to a fire for a certain temperature and time, it melts and the sparks fall off and the fire spreads. More preferably, when the weight ratio of modacrylic fiber is 75% and the fiber weight ratio of Tencel is 25%, excellent flame retardancy and the effect of preventing sparks due to melting are expressed.

By supplying the tow to the carding machine and mixing it before carding, it is possible to remove short fibers and achieve a uniform mixed island between different types of fibers.

After the mixing is completed, the fiber web is supplied to the flat type carding machine for carding. In order to remove impurities and make a carding sliver with excellent fiber parallelism, cylinder RPM 400~450, Taker-in RPM 1100 ~ 1200, Flat Speed 230~250 mm/min, between cylinder and flat The gauge is the first gauge between the cylinder and the flat by adjusting the first gap adjusting pin - The second gauge between the cylinder and the flat by adjusting the second gap adjusting pin - The second gauge between the cylinder and the flat by adjusting the third gap adjusting pin The 4th gauge between the cylinder and the flat by the adjustment of the 3rd gauge-fourth spacing adjusting pin - The 5th gauge between the cylinder and the flat by the adjustment of the 5th spacing adjusting pin is 12-10-8-8-8 (inch/1000) ), it is preferable to use a carding machine and set the diameter of the trumpet to 4 to 6 mm for making the sliver.

In the case of the modacrylic fiber according to the present invention, it is possible to increase the carding effect and reduce the nep by narrowing the cylinder and the flat gauge as described above in order to ensure uniform fineness. Take-in RPM should be set to around 1100 ~ 1200 to secure a uniformity with excellent product quality.

In the softening process, the sliver is supplied to the doubling machine to reduce the fineness of the sliver and improve the uniformity. , It is recommended to use a doubling machine with an interval between the 2nd and 3rd rollers of 60 to 65 mm, a Back Draft of 1.5 to 1.7, and a Total Draft of 6 to 7. In particular, in the roller gauge, the distance between the front roller and the second roller is 55 to 60 mm, and the interval between the second and third rollers is 60 to 65 mm. It is preferable because it can ensure excellent uniformity by being suitable for Back draft (Back Draft) is set to be 1.5 to 1.7 to control excessive tension generation to prevent cutting, and it is preferable because it is possible to improve the evenness.

The mixing of the different types of fibers can be done in the raw material stage, and can also be performed in the carding machine or the softening machine.

The sliver is supplied to the draft unit located at the upper end of the nozzle of the Murata Vortex spinning machine and stretched by the draft roller to decrease the fineness. The draft part is a four-wire draft part, and the roller gauge preferably has a front roller-second roller spacing of 54.5 mm, a second roller-third roller spacing of 51 mm, and a 3rd roller-back roller spacing of 55 mm. It is preferable that the back draft is 3.0 to 3.5, the inter draft (Inter Draft) is 1.8 to 2.0, and the total draft is 140 to 280. When it is set to 2.0, it is excellent in spinning property and quality. If the Inter Draft is less than 1.8, the spun yarn evenness deteriorates, and if it exceeds 2.0, trimming may occur.

As described above, after reducing the fineness of the sliver in the draft section and straightening and paralleling the constituent fibers, the fibers are supplied to the ceramic nozzle of the Murata Vortex spinning machine, which is the spinning mechanism of the present invention.

The fibers passing through the draft are formed into spun yarn in the nozzle of a known Murata Vortex spinning machine that has already been commercialized. The fibers passing through the draft are formed into spun yarn in the nozzle. As the fiber enters the spinning chamber by the airflow injected into the nozzle, some fibers separated from the fibers by the action of the swirling airflow around the tip of the hollow guide rod It is turned over or wrapped around the outer periphery of the tip of the hollow guide rod. The fibers twisted by the swirling airflow are discharged from the nozzle to form the twisted spun yarn and form the core fiber and the lapping fiber.

In the present invention, it is preferable to use a nozzle having a nozzle diameter of 1.0 to 1.3 mm to improve the twisting of the spun yarn, and to improve the soft feel and spinning property due to the bulkiness of the modacrylic fiber itself.

The air pressure of the nozzle should be 0.4 ~ 0.5 kg/cm2. If it is less than 0.4 kg/cm2, the focusing property of the blended yarn is lowered and the tensile strength is lowered, and when it exceeds 0.5 kg/cm2, the focusing property is rapidly increased. Due to this, there is a problem in that the soft touch feeling of the blended yarn is reduced.

The spun yarn formed in this way and passed through the nozzle passes between the nip roller and the dispensing roller at a feeding speed of 300 to 400 m/min and is wound up in a spun yarn package.

In the present invention, modacrylic fiber and tencel fiber are mixed by the above manufacturing method, and the modacrylic / tencel air jet mixed spun yarn with excellent flame retardancy is formed in a shape in which a core part in which fibers are arranged in a spinning direction and a part of the outer periphery of the core part are wrapped around the outer periphery of the core part. provided

The modacrylic/tensel air jet mixed spun yarn has excellent physical properties, with a tensile strength of 1.30 to 1.35 g/d, an elongation of 9 to 11%, and a rate of change of luxuries -5.1 to 5.9%, and flame retardancy is required for electric arc welding It can be applied as a specialized material for protective clothing and has excellent friction resistance as a part of the fiber wraps around the outside of the core.

Therefore, according to the present invention, flame-retardant performance and tensile strength are expressed through modacrylic fiber, and flame-retardant performance is maximized by suppressing residual dust time, after-flame time, puncture and spark generation by preventing melting in case of fire through tencel fiber. Since the uniformity of air jet spinning can provide a uniform composite spun yarn, it can be used to manufacture protective clothing fabrics such as electric arc welding protective clothing, electrical work clothes, and fire fighting suits.

1 is a surface photograph (×100) of the modacrylic / tencel air jet composite spun yarn of the present invention.
2 is a surface photograph (×300) of the modacrylic / tencel air jet composite spun yarn of the present invention.
3 is a cross-sectional photograph (×300) of the modacrylic / tencel air jet composite spun yarn of the present invention.
Figure 4 is a cross-sectional photograph (x800) of the modacrylic / tencel air jet composite spun yarn of the present invention.

Hereinafter, the following examples are non-limiting examples of the manufacturing method of the modacrylic / tencel air jet mixed spun yarn of the present invention.

[Example 1]

Prepare modacrylic fiber with fiber fineness of 1.7dtex, fiber length of 51mm, 1.7dtex, and tencel fiber with fiber length of 51mm, and mix the two fiber materials in the raw state. Carding cylinder 400 RPM, taker RPM 1100, flat speed 240mm /min, the gauge between the cylinder and the flat, the first gauge between the cylinder and the flat by the adjustment of the first gap adjusting pin - The second gauge between the cylinder and the flat by the adjustment of the second gap adjusting pin - Control of the third gap adjusting pin The 3rd gauge between the cylinder and the flat by the adjustment of the fourth gap adjusting pin - The fourth gauge between the cylinder and the flat by the adjustment of the fourth gap adjusting pin - The fifth gauge between the cylinder and the flat by the adjustment of the fifth gap adjusting pin 12-10-8- After manufacturing the carding sliver by setting it to 8-8 (inch/1000), it is supplied to the softening process to provide a 60 mm gap between the front and second rollers, 65 mm between the second and third rollers, and a back draft. 1.7, Total Draft A soft sliver was manufactured by drafting through a softening process using a 7-person doubling machine.

The prepared soft sliver is supplied to a Murata Vortex spinning machine and is a 4-wire draft part, with a front roller-second roller interval of 54.5 mm, a second roller-third roller interval of 51 mm, a 3rd roller-back roller interval of 55 mm, and a back draft of 3.5, After stretching through the draft section with Inter Draft 2.0 and total draft of 280, the spun yarn is formed by a nozzle with a nozzle diameter of 1.3 mm and an air pressure of 0.5 kg/cm 2 and wound to prepare a modacrylic/tensel airjet mixed spun yarn having the physical properties shown in Table 1 below.

division Example 1 note Number of times (Nec) 21.0's/2 (2 go) KS K 0414:2015
(British style, cotton count) mixing ratio Modacrylic / Tencel (75/25) number of twists
(T/M) S 352 KS K ISO 2061:2010 The tensile strength
(g/d) 1.32 KS K 0475 : 2018 (Spun yarn)
Gripping distance: 250mm
Speed 250mm/min Shin Do
(%) 10.9 rate of change of luxury
(%) -5.62 KS K 0215 : 2019
Hot water, 100℃/30min Limiting Oxygen Index (LOI) 32.2% KS M ISO 4589-2 : 1996
Ignition method: B full-wave ignition

As a result of measuring the physical properties of the mixed spun yarn of Example 1, the tensile strength was 1.32 g/d, indicating excellent mechanical strength and 10.9% elongation. It shows excellent combustion behavior of 32.2% when measuring the limiting oxygen index (LOI) after fabric manufacturing using the mixed spun yarn.

Claims (5)

A honta-myeon process of mixing modacrylic fibers having a fineness of 1.0 to 2.0 dtex and a fiber length of 45 to 54 mm and tencel fibers having a fineness of 1.0 to 2.0 dtex and a fiber length of 45 to 54 mm in a weight ratio of 65:35 to 95:5;
a carding process of manufacturing slivers by combing the fibers;
A 3-wire draft method, the roller gauge has a front roller and second roller interval of 55 to 60 mm, a second roller and 3rd roller interval is 60 to 65 mm, a back draft 1.5 to 1.7, a total draft 6 to a softening process of drafting the sliver with a 7-man doubling machine; and
The sliver is supplied to a Murata Vortex spinning machine, and as a four-wire draft part, the roller gauge has a front roller-second roller interval of 54.5 mm, a second-third roller interval of 51 mm, a 3rd roller-back roller interval of 55 mm, and a bag After stretching through the draft section with a draft of 3.0 to 3.5, Inter Draft 1.8 to 2.0, and total draft of 140 to 280, use a nozzle with a nozzle diameter of 1.1 to 1.3 mm and air pressure of 0.4 to 0.5 kg/cm 2 A method for manufacturing a modacrylic/tencel air jet mixed spun yarn with excellent flame retardancy, characterized in that it consists of a spinning process of winding the spun yarn at a speed of 300 to 400 m/min. delete delete delete delete

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