Preparation method of FDY fiber for ATY processing

Abstract

The invention discloses a preparation method of FDY (Fully Drawn Yarn) fiber for ATY (Air Textile Yarn) processing, and belongs to the technical field of chemical fiber textile. On the basis of traditional FDY processing steps, through low-oiling and few-network process control, the prepared FDY fiber is low in oil content, low in network degree and good in antistatic property, the friction coefficient of tows to machinery equipment can be reduced, the service life of the equipment and materials can be prolonged, the prepared FDY fiber can be better entangled and curled, and the antistatic property of the FDY fiber is improved. The number of coils of a product is increased, the hair feeling of the product is improved, blockage of an air nozzle by an oiling agent is reduced, and good applicability to ATY machining is achieved.

Description

Technical Field

[0001] The invention specifically relates to a preparation method of FDY fiber for ATY processing, and belongs to the technical field of chemical fiber textiles. Background Art

[0002] Air textured yarn (ATY) is a kind of yarn that uses air jet technology to intertwine the yarn bundles to form irregular twisted loops, giving the yarn bundles a fluffy terry shape. It has the properties of both filaments and staple fibers, with a strong wooly feel and good hand feel. It plays an important role in the processing of imitation wool, imitation linen, imitation cotton and other fabrics.

[0003] Fully drawn yarn (FDY) fiber is an important raw material for the production of ATY, and its product quality has a significant impact on the processing performance of ATY. Traditional FDY products usually use a large amount of oil application and high intertwining degree processing during the preparation process, resulting in the finished FDY fibers generally showing the characteristics of high oil content and high intertwining degree. However, FDY fibers with high oil content are prone to cause oil blockage in the air nozzle during the ATY processing process. In order to maintain the normal operation of the equipment, the nozzle needs to be frequently disassembled and cleaned, which not only leads to fluctuations in product quality, but also significantly reduces production efficiency. The high intertwining degree of FDY fiber also requires that higher air pressure should be applied in the air processing link, resulting in increased energy consumption and equipment load. Therefore, the research and development of FDY fiber production processes that are adapted to the characteristics of the ATY production process has become an important issue that needs to be urgently addressed in the current industry. Summary of the Invention

[0004] In response to the existing problems, the present invention provides a method for preparing FDY fiber for ATY processing. The prepared FDY has low oil content, low network density and good antistatic properties, and is adaptable to ATY processing technology.

[0005] The technical solutions of the present invention are as follows: The present invention provides a method for preparing FDY fibers for ATY processing, comprising the steps of heating and melting nylon chips, spinning them through a spinneret, and cooling them to obtain primary yarns, and then subjecting the obtained primary yarns to oiling, network processing, stretching and shaping, and winding to obtain the FDY fibers for ATY processing.

[0006] Furthermore, during the cooling and forming process, side blowing is used to cool the filament bundle so that the filament bundle is quickly cooled and solidified after leaving the spinneret. The wind temperature is generally controlled at 18°C ​​and the wind speed is 0.3~0.6m / s to ensure uniform cooling of the filament bundle and form a good primary fiber structure.

[0007] Furthermore, the spun fibers are oiled by an oiling device, and the oiling rate of the tow is controlled between 0.7% and 1.0%. The present invention reduces the amount of oil applied to the tow by process control of the oiling rate, thereby ensuring that the prepared FDY fiber has good smoothness, antistatic properties and bundling properties, and is more suitable for ATY processing.

[0008] Furthermore, the oiling agent used in the oiling process is a water-soluble spinning oil.

[0009] Furthermore, during the network processing process, the pressure and air flow velocity of the network nozzle are controlled to reduce the formation of network points of the FDY fiber for ATY processing; wherein the pressure of the network processing is controlled to be 0.1~0.2 MPa, and the air flow velocity is controlled to be between 10~20 m / s.

[0010] Furthermore, the stretching ratio during the stretching and shaping process is 1.05~1.6, which can effectively improve the orientation and crystallinity of the fiber and improve the mechanical properties of the fiber. The stretching temperature is 150~185℃, which can ensure that the fiber has good thermal stability.

[0011] Furthermore, during the winding forming process, a high-speed winding machine is used to wind the fibers after cooling, oiling, network processing, and stretching and shaping treatments, and the winding speed is 4500~5000 m / min.

[0012] Different from the prior art, the present invention has the following beneficial effects: 1. The present invention provides a complete FDY fiber production process for ATY processing. Based on the traditional FDY processing steps, the present invention uses low-oiling and low-interweaving process control to ensure that the produced FDY fiber has low oil content, low interweaving degree and good antistatic properties, which can reduce the friction coefficient of the tow on machinery and equipment, and extend the service life of equipment and materials. In some preferred embodiments, combined with the use of a water-soluble oil agent, the FDY fiber can be more easily dispersed and opened after being washed with water.

[0013] 2. The FDY fiber prepared by the present invention is applied to ATY processing. After being sprayed with high-speed airflow, the FDY fiber with less network prepared by the present invention can be better entangled and curled under relatively low air pressure conditions compared with traditional FDY, thereby increasing the number of coils and the hairy feel of the product. The low oil content of FDY also makes it difficult for the residual oil to clog the nozzle after degreasing by water, thereby avoiding fluctuations in product quality and reduced production efficiency, effectively reducing the amount of water and compressed air used in the ATY production process, and saving production costs. At the same time, during the ATY production process, the antistatic properties of the prepared FDY can also reduce the friction between the two component filaments of the sheath-core filament during the initial entanglement process of the air nozzle, so that the product can achieve a better deformation effect. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with preferred embodiments. The embodiments are provided only to illustrate the present invention, but not to limit the scope of the present invention.

[0015] Unless otherwise specified, the materials, reagents, etc. used in the following examples can be obtained from commercial sources; the methods in the following examples are conventional methods unless otherwise specified.

[0016] Example 1 This embodiment provides a method for preparing FDY fiber for ATY processing, comprising the following steps: S1. Spinning: The screened nylon chips are heated and melted at 255°C using a screw extruder, and the melt is transported to the spinning assembly by the rotation of the screw. In the spinning assembly, the melt is filtered through multiple filter screens to remove impurities and gel particles to ensure spinning stability and fiber quality. The filter screen specifications can be 15μ to 30μ, and 20μ is preferred in this embodiment. The melt is then ejected through a spinneret to form a filament bundle. The spinneret aperture can be 0.18 to 0.35 mm, and a spinneret with an aperture of 0.3 mm is selected in this embodiment. S2. Cooling and shaping: The air temperature is controlled at 18°C ​​and the air speed is controlled at 0.5 m / s. The side-blowing cooling method is adopted to make the filaments quickly cool and solidify after leaving the spinneret to obtain the primary filaments. S3, oiling: oiling the filaments cooled in step S2 by an oiling device, using a water-soluble spinning oil, and controlling the oiling rate to be 0.9%; S4, network processing: the primary yarn obtained in step S3 is subjected to network processing, the network pressure is 0.15 MPa, and the air flow speed is 15 m / s; S5, stretching and shaping: the primary yarn is stretched using a stretching device with a stretching ratio of 1.2 and a stretching temperature of 170°C; S6. Winding: The fibers after stretching, networking and oiling are wound using a high-speed winder at a winding speed of 4800 m / min to obtain FDY fibers.

[0017] Example 2 This embodiment provides a method for preparing FDY fiber for ATY processing, comprising the following steps: S1. Spinning: A screw extruder heats and melts the screened nylon chips at 250°C, and the rotating screw transports the melt to the spinning assembly. In the spinning assembly, the melt is filtered through a 30μ multi-stage filter to remove impurities and gel particles, ensuring spinning stability and fiber quality. The melt is then ejected through a 0.3mm pore spinneret to form a tow. S2. Cooling and shaping: The air temperature is controlled at 18°C ​​and the air speed is controlled at 0.3 m / s. A side-blowing cooling method is used to rapidly cool and solidify the filaments after leaving the spinneret to obtain the primary filaments. S3, oiling: oiling the filaments cooled in step S2 by an oiling device, using a water-soluble spinning oil, and controlling the oiling rate to be 0.7%; S4, network processing: the primary yarn obtained in step S3 is subjected to network processing, the network pressure is controlled at 0.1 MPa, and the air flow speed is 10 m / s; S5, stretching and shaping: the primary yarn is stretched using a stretching device with a stretching ratio of 1.05 and a stretching temperature of 150°C; S6. Winding: The fibers after stretching, networking and oiling are wound using a high-speed winder at a winding speed of 4500 m / min to obtain FDY fibers.

[0018] Example 3 This embodiment provides a method for preparing FDY fiber for ATY processing, comprising the following steps: S1. Spinning: A screw extruder heats and melts the screened nylon chips at 250°C, and the rotating screw transports the melt to the spinning assembly. In the spinning assembly, the melt is filtered through a 30μ multi-stage filter to remove impurities and gel particles, ensuring spinning stability and fiber quality. The melt is then ejected through a 0.3mm pore spinneret to form a tow. S2. Cooling and shaping: The air temperature is controlled at 18°C ​​and the air speed is controlled at 0.6 m / s. The side-blowing cooling method is adopted to make the filaments quickly cool and solidify after leaving the spinneret to obtain the primary yarn; S3, oiling: oiling the filaments cooled in step S2 by an oiling device, using a water-soluble spinning oil, and controlling the oiling rate to be 1.0%; S4, network processing: the primary yarn obtained in step S3 is subjected to network processing, the network pressure is controlled at 0.2 MPa, and the air flow speed is 20 m / s; S5. Stretching and shaping: The primary yarn is stretched using a stretching device with a stretching ratio of 1.6 and a stretching temperature of 185°C; S6. Winding: The fibers after stretching, networking and oiling are wound using a high-speed winder at a winding speed of 5000 m / min to obtain FDY fibers.

[0019] Performance Testing The physical properties of the FDY products for ATY production prepared in Examples 1 to 3 are shown in Tables 1 to 3.

[0020] Table 1 Physical properties of FDY products in Example 1

[0021] Table 2 Physical properties of FDY products in Example 2

[0022] Table 3 Physical properties of FDY products in Example 3

Claims

1. A method for preparing FDY fiber for ATY processing, comprising heating and melting nylon chips, and then sequentially subjecting the fibers to extrusion spinning, cooling and forming, oiling, network processing, stretching and shaping, and winding. The method is characterized in that: During the oiling process, the oiling rate is controlled to be between 0.7% and 1.0%, and during the network processing, the pressure and air flow velocity of the network nozzle are controlled to reduce the formation of network points of the prepared FDY fiber for ATY processing; Among them, the pressure of network processing is controlled at 0.1~0.2 MPa, and the air flow speed is controlled between 10~20 m / s.

2. The method for preparing FDY fiber for ATY processing according to claim 1, characterized in that: The oil used in the oiling process is a water-soluble spinning oil.

3. The method for preparing FDY fiber for ATY processing according to claim 1, characterized in that: During the stretching and shaping process, the stretching ratio is 1.05~1.6, and the stretching temperature is 150~185℃.

4. The method for preparing FDY fiber for ATY processing according to claim 1, characterized in that: During the winding process, a high-speed winder is used to wind the fibers after cooling, oiling, network processing, and stretching and shaping. The winding speed is 4500~5000 m / min.

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