A super-cotton-like polyester fiber and its production method

Abstract

The present invention discloses a production method of super imitation cotton polyester fiber, including producing POY polyester pre-oriented yarn; producing FDY polyester drawn yarn, and the process is as follows: polymerization final polymerization kettle → melt distributor → booster pump → melt conveying → cooler → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → component spinning → cooling and forming → pre-network bundling → spinning duct → U-shaped wire guide → first godet roller GR1 → second hot roller GR2 for heating and drawing → third hot roller GR3 for heating and drawing → fourth hot roller GR4 for heating and setting → fifth hot roller GR5 for heating and setting → integrated oil nozzle for oiling → pre-network → sixth godet roller GR6 → main network → seventh godet roller GR7 → wire guide wheel → winding and forming; mixing POY polyester pre-oriented yarn and FDY polyester drawn yarn. It can solve the problems existing in the drawing process after spinning, cooling, setting and then oiling, that is, the filament bundle shakes severely when winding around the hot roller, and the wire path is unstable, resulting in uneven heat absorption, and further affecting the unevenness of fiber physical indexes and dyeing difference.

Description

Technical Field

[0001] The present invention relates to the technical field of textile limit production, and particularly relates to a production method of super cotton-like polyester fiber. Background Art

[0002] At present, cotton fiber is an important raw material in the textile industry, with excellent hygroscopicity, warmth retention, softness, easy dyeing, and low static electricity generation properties, so it is deeply loved by consumers. However, with the growth of the world's population, the conflict between the demand for cotton fiber and the use of arable land for cotton production has led more and more textile enterprises to use polyester fiber to imitate cotton. Although polyester fiber has advantages such as high strength, corrosion resistance, moth resistance, non-deformability, and wear resistance, due to the mainly rigid benzene ring chains in the polyester molecular chain and the lack of hydrophilic groups, polyester fiber has poor hygroscopicity, poor dyeing performance, and a lot of static electricity. Therefore, to achieve super cotton-like, the existing technology mainly changes the properties of polyester by cross-sectional shaping and mixed fiber technology. Among them, cross-sectional shaping refers to using fibers with shapes such as triangular, Y-shaped, cross-shaped, three-leaf-shaped, flat-shaped, king-shaped, and hollow-shaped to improve the hygroscopic performance of cotton-like polyester. The mixed fiber technology means that each fiber contains two or more property components, that is, due to the different thermal shrinkage rates of the two fibers, the POY fiber with a large shrinkage rate forms the core filament of the mixed fiber filament during post-processing weaving, and the FDY fiber with a small shrinkage rate will curl around the core filament to form a spiral curl, making the fabric fluffy and soft, so it is widely used in the fields of cotton imitation and wool imitation.

[0003] There are mainly the following two production process conditions in the existing mixed fiber technology: One is the one-step production of POY / FDY mixed fiber filament, that is, on the FDY production equipment, through the separate components of POY and FDY for melting extrusion and cooling forming, and then compounded together through networking. Although the production cost of this technology is low, there are problems such as large tension fluctuations after the two fibers are compounded and difficult to accurately match the aggregated state structures of different fibers (in the one-step production of POY / FDY mixed fiber filament, through separate components for melting extrusion and cooling forming, since the cooling forming has a great influence on the orientation and crystallization results of the fiber, and the cooling process conditions and bundling positions required by POY and FDY are different. Although the cooling process conditions of POY (half of the mesh plate) and FDY (half of the mesh plate) are separately controlled by a parallel double regulating valve, it is still difficult to accurately match the best aggregated state structures of POY and FDY. At the same time, the two adjacent filaments of POY and FDY are easily affected by the cooling process conditions of each other, affecting their physical indexes, resulting in a large difference in physical indexes between these two filaments and other filaments). At the same time, in the face of changing market conditions, it is necessary to transform the equipment to spin other series of products, resulting in high conversion costs and difficulties.

[0004] Second, the two-step method for producing POY / FDY conjugate filaments has the following process flow: The process flow of POY / FDY conjugate filaments is: POY raw filaments → pre-positioned M-type network → tension adjusting rod → first roller → upper hot box → cooling plate → two-way false twister → leather roller type second roller → two-way network → FDY filaments → apron type auxiliary second roller → out-of-box wire guiding system → apron type third roller → oiling system → winding and forming. POY fibers and FDY fibers are separately produced on two sets of equipment, and then the POY fibers are false-twisted and deformed on a texturing machine and then combined and networked with the FDY fibers at the network point. Although this technical route has advantages such as easy production conversion, according to the paper: Fan Juan, Wang Xueli, Yu Jianyong. Development status and research progress of differential shrinkage conjugate filaments [J]. Synthetic Fiber Industry, 2013, 42(2): 12-17, the filaments spun by the two-step differential shrinkage conjugate filament production technology have no entanglement, and the heat shrinkage performance, mechanical properties, dyeing properties, etc. can be well regulated to achieve multiple combinations and multiple varieties. However, the product quality uniformity is poor, there are few fine denier and low fineness varieties, and the cotton-like effect of porous fine denier is better than that of medium and coarse denier products.

[0005] Therefore, the object of the present invention is to solve the problems in the existing one-step method for producing POY / FDY conjugate filaments, such as difficult production conversion and difficult to accurately match the aggregated state structures of different fibers, and the problem of difficult production of fine denier and low fineness varieties in the two-step method for producing POY / FDY conjugate filaments. Summary of the Invention

[0006] To solve certain or some technical problems existing in the prior art, one of the objects of the present application is to provide a production method of super cotton-like polyester fiber, which can solve the problems that the filament bundle shakes severely on the hot roller winding circle and the silk path is unstable in the stretching process after the spinning is first cooled and shaped and then oiled, resulting in uneven heat absorption, and further affecting the uneven physical indexes and poor dyeing of the fiber, and can better enhance the cohesion and bundling property of the filament bundle, so as to produce super cotton-like polyester fiber with medium-fine denier and low fineness varieties.

[0007] Another object of the present application is to provide a super cotton-like polyester fiber, which can achieve the purpose of medium-fine denier and low fineness of the fiber fineness variety.

[0008] To solve the above-mentioned existing technical problems, one of the objects of the present application is achieved by adopting the following technical solution:

[0009] A super cotton-like polyester fiber and its production method, the production method comprising:

[0010] S1. Produce POY polyester pre-oriented yarn: The production process of the POY polyester pre-oriented yarn is as follows: polyester melt transportation → booster pump → melt cooling → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → spinning pack → ring blower → cooling and forming → oiling at the oil nozzle → spinning channel → first godet wheel → pre-network → second godet wheel → winding and forming;

[0011] S2. Produce FDY polyester drawn yarn: The production process of the FDY polyester drawn yarn is as follows: final polymerization kettle of polymerization → melt distributor → booster pump → melt transportation → cooler → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → spinning in the pack → cooling and forming → atomizing device → pre-network bunching → spinning channel → counter-directional U-shaped godet → first godet roller GR1 → second hot roller GR2 for heating and drawing → third hot roller GR3 for heating and drawing → air guiding plate → fourth hot roller GR4 for heating and setting → fifth hot roller GR5 for heating and setting → integrated oil nozzle for oiling → pre-network → sixth godet roller GR6 → main network → seventh godet roller GR7 → godet wheel → winding and forming;

[0012] S3. POY polyester pre-oriented yarn and FDY polyester drawn yarn: Mix the POY polyester pre-oriented yarn and the FDY polyester drawn yarn to form super imitation cotton polyester fiber.

[0013] Preferably, the pump supply formula for the metering pump melt extrusion of the POY polyester pre-oriented yarn and the FDY polyester drawn yarn in the production process is: booster pump = the produced POY polyester pre-oriented yarn or FDY polyester drawn yarn * spinning speed / 10,000, where the spinning box temperature of the POY polyester pre-oriented yarn and the FDY polyester drawn yarn in the production process is 288 - 292 °C.

[0014] Preferably, the physical indexes of the POY polyester pre-oriented yarn are: 80 dtex ≤ linear density ≤ 250 dtex, 72 ≤ number of holes ≤ 288, breaking strength ≥ 2.1 cN / dtex, breaking elongation 126 - 130%, evenness variation coefficient of yarn ≤ 1.8 cV / %, oil content 0.28 - 0.32%;

[0015] The physical indexes of the FDY polyester drawn yarn are: 40 dtex ≤ linear density ≤ 120 dtex, 36 ≤ number of holes ≤ 144, breaking strength ≥ 3.8 cN / dtex, breaking elongation 26 - 30%.

[0016] Preferably, the mixing process of the POY polyester pre-oriented yarn and the FDY polyester drawn yarn is: POY and FDY combination → double raw yarn tubes → pre-positioned M-type network → tension adjusting rod → first roller → upper heat box → cooling plate → bi-directional false twister → leather roller type second roller → bi-directional network → apron type auxiliary second roller → outside box godet system → apron type third roller → oiling system → winding and forming.

[0017] Preferably, the oil content of the FDY fiber after oiling by the integrated oil nozzle in step S2 is 0.3-0.4%.

[0018] Preferably, in the cooling and forming of the FDY polyester drawn yarn, an annular air blower is used for cooling. An atomizing device is provided below the air blower, and the conveying direction of the atomizing device is parallel to the direction of the filament bundle. An antistatic aqueous solution is added to the water tank in the atomizing device, and the proportion of the antistatic aqueous solution is 3-5%.

[0019] Preferably, the U-shaped wire guide includes a first U-shaped porcelain part and a second U-shaped porcelain part. The first U-shaped porcelain part and the second U-shaped porcelain part are installed in opposite directions, and the included angle is 10-15°.

[0020] Preferably, the temperature of the second hot roller GR2 and the third hot roller GR3 is 50-70°C, the temperature of the fourth hot roller GR4 and the fifth hot roller GR5 is 120-140°C, and the first wire guide roller GR1, the sixth wire guide roller GR6 and the seventh wire guide roller GR7 have no heating temperature.

[0021] Preferably, the second hot roller GR2, the third hot roller GR3, the fourth hot roller GR4 and the fifth hot roller GR5 are in a box body. An air guiding plate is provided between the third hot roller GR3 and the fourth hot roller GR4 to block the air flow through the air guiding plate.

[0022] Preferably, the outer diameter of the first wire guide roller GR1 is 110 mm, and the contact length of the filament bundle with the roller surface of the first wire guide roller GR1 is 25% of the roller outer diameter; the outer diameters of the second hot roller GR2 to the fifth hot roller GR5 are all 225 mm, and the contact lengths of the filament bundle with the roller surfaces of the second hot roller GR2 to the fifth hot roller GR5 are all 65% of the roller outer diameter; the outer diameters of the sixth wire guide roller GR6 and the seventh wire guide roller GR7 are both 110 mm, and the contact lengths of the filament bundle with the roller surfaces of the sixth wire guide roller GR6 and the seventh wire guide roller GR7 are both 50% of the roller outer diameter.

[0023] The second object of the present application is achieved by the following technical solutions:

[0024] A super imitation cotton polyester fiber, a super imitation cotton polyester fiber obtained by a production method of a super imitation cotton polyester fiber, having a breaking strength ≥ 3.6 cN / dtex, an elongation at break of 14-18%, a crimp shrinkage rate of 14-16%, and a crimp stability ≥ 85%

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) The production process route of FDY polyester drawn yarn was adjusted. After the melt entered the spinneret pack for spinning, the process route was changed. The changed process route adopted an oil-free drawing process technology route, that is, after the fiber was cooled and shaped, it entered the heating drawing process through pre-network bundling and counter-directional U-shaped wire guide bundling. After heating and shaping, the fiber was oiled, which solved the problems of unstable fiber path and shaking on the hot roller when the fiber was not oiled. At the same time, during the production of FDY polyester drawn yarn, since the tow after cooling and shaping was not oiled during spinning before entering the spinning channel, the cohesion of the tow was poor and it was easy to spread. Therefore, pre-network bundling was increased, and by setting up a pre-network bundling device, the cohesion and bundling property of the tow could be better enhanced, thus solving the problems of poor cohesion and easy spreading of the tow.

[0027] (2) An atomizing device was added, and an antistatic agent was added to the water tank in the atomizing device to improve the antistatic property of the non-oiled tow and reduce hairiness and broken ends.

[0028] (3) Through the oil-free drawing technology, the oil content rate of FDY polyester drawn yarn was reduced to 0.3 - 0.4%, and the cleaning cycle of the hot box of the super cotton-like polyester fiber was increased. Description of the Drawings

[0029] Figure 1 It is the process flow chart of the present invention. Detailed Embodiments

[0030] Next, in combination with the drawings and specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be combined arbitrarily to form new embodiments.

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0032] The terms "first", "second", etc. in the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0033] As Figure 1 shown, a production method of super imitation cotton polyester fiber, the production method comprising:

[0034] S1. Producing POY polyester pre-oriented yarn: The production process of the POY polyester pre-oriented yarn is: polyester melt conveying → booster pump → melt cooling → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → spinning pack → ring blower → cooling and forming → oiling at oil nozzle → spinning duct → first godet wheel → pre-network → second godet wheel → winding and forming;

[0035] S2. Producing FDY polyester drawn yarn: The production process of the FDY polyester drawn yarn is: polymerization final polymerization kettle → melt distributor → booster pump → melt conveying → cooler → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → component spinning → cooling and forming → atomizing device → pre-network bunching → spinning duct → opposed U-shaped godet → first godet roller GR1 → second hot roller GR2 heating and drawing → third hot roller GR3 heating and drawing → air guide plate → fourth hot roller GR4 heating and setting → fifth hot roller GR5 heating and setting → integrated oil nozzle oiling → pre-network → sixth godet roller GR6 → main network → seventh godet roller GR7 → godet wheel → winding and forming;

[0036] S3. POY polyester pre-oriented yarn and FDY polyester drawn yarn: Mixing the POY polyester pre-oriented yarn and the FDY polyester drawn yarn to form super imitation cotton polyester fiber.

[0037] The conventional production process route of FDY polyester drawn yarn is: polymerization final polymerization kettle → melt distributor → booster pump → melt transportation → cooler → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → assembly spinning → cooling and forming → oiling at the oil nozzle → spinning duct → pre-network → GR1 hot roller → GR2 hot roller → guide wire hook → main network → winding and forming. This process route is to oil the yarn after spinning cooling and setting and then draw it. However, since the FDY polyester drawn yarn for super cotton-like polyester fiber requires a low oil content rate, only 0.3 - 0.4%, but the yarn bundle with this oil content rate shakes severely when winding around the hot roller (the yarn bundle of this process needs to wind around 6 circles on the GR1 hot roller and GR2 hot roller), and the silk path is unstable or there are collisions of multiple yarn bundles, resulting in uneven heating, and further affecting the unevenness of fiber physical indexes and dyeing difference. To solve this technical problem, the production process route of FDY polyester drawn yarn is adjusted. After the melt enters the assembly spinning, the process route is changed. The changed process route adopts an oil-free drawing process route, that is, after the fiber is cooled and set, it is bundled through the pre-network, enters the heating and drawing, and is oiled after heating and setting, solving the problem of unstable silk path with low oil content. At the same time, during the production of FDY polyester drawn yarn, since the yarn bundle after cooling and forming is not oiled during spinning before entering the spinning duct, the cohesion of the yarn bundle is poor and it is easy to disperse. Therefore, a pre-network bundling is added, and by setting a pre-network bundling device, the cohesion and bundling property of the yarn bundle can be better enhanced, thus solving the problem of poor cohesion and easy dispersion of the yarn bundle.

[0038] Furthermore, it is improved that the pump supply formula for the metering pump melt extrusion of the POY polyester pre-oriented yarn and FDY polyester drawn yarn in the production process is: booster pump = the produced POY polyester pre-oriented yarn or FDY polyester drawn yarn * spinning speed / 10000, where the temperature of the spinning box of the POY polyester pre-oriented yarn and FDY polyester drawn yarn in the production process is 288 - 292 °C; the physical indexes of the POY polyester pre-oriented yarn are: 80 dtex ≤ linear density ≤ 250 dtex, 72 ≤ number of holes ≤ 288, breaking strength ≥ 2.1 cN / dtex, breaking elongation 126 - 130%, evenness variation coefficient ≤ 1.8 cV / %, oil content rate 0.28 - 0.32%; the physical indexes of the FDY polyester drawn yarn are: 40 dtex ≤ linear density ≤ 120 dtex, 36 ≤ number of holes ≤ 144, breaking strength ≥ 3.8 cN / dtex, breaking elongation 26 - 30%.

[0039] At present, the current POY fibers are separately fed into the hot box for texturing, so the physical index requirements for FDY products are not very high, and the oil content can be as high as over 0.8%. At the same time, POY products, especially when blended with other fibers, are basically thick denier products, and their super cotton-like effect is not ideal. However, both POY and FDY products are required to be fine denier and multi-hole fibers, which can provide raw material support for realizing super cotton-like fibers of medium and fine denier and low fiber fineness. Therefore, it is necessary to limit the physical indexes of POY polyester pre-oriented yarn and FDY polyester drawn yarn. After limiting them to the above requirements, the single filament linear density of POY and FDY products can be finer, and the subsequent cotton-like hand feeling is better. Among them, the finer the single filament linear density of POY and FDY products, the better the subsequent cotton-like hand feeling.

[0040] Further improvement is that the blending process of the POY polyester pre-oriented yarn and the FDY polyester drawn yarn is as follows: POY and FDY combination → double raw yarn tubes → pre-positioned M-type network → tension adjusting rod → first roller → upper hot box → cooling plate → bi-directional false twister → leather roller type second roller → bi-directional network → apron type auxiliary second roller → out-of-box wire guiding system → apron type third roller → oiling system → winding and forming.

[0041] Compared with the conventional process, the FDY polyester drawn yarn is simultaneously subjected to false twisting, stretching, deformation, etc. with the POY polyester pre-oriented yarn on the texturing machine. In the conventional two-step POY / FDY or POY / DTY production process, the FDY polyester drawn yarn does not enter the hot box and is not cooled. By feeding the FDY polyester drawn yarn into the hot box and cooling it again, and through false twisting and deformation, the crimp shrinkage rate of the FDY fiber is increased, making the fine denier fiber have better bulkiness and hand feeling, thereby improving the cotton-like effect of the fine denier fiber. After the FDY polyester drawn yarn is stretched and shaped, the internal structure of the fiber is basically stable, enabling the filament bundle to have a relatively high breaking strength and a slightly lower breaking elongation rate, and it can be directly used for weaving. Utilizing the difference in boiling water shrinkage rates of the POY polyester pre-oriented yarn and the FDY polyester drawn yarn, the filament with a large shrinkage rate forms the core filament, and the filament with a small shrinkage rate will form spiral curls on the surface layer of the filament, making the yarn have a fluffy and soft hand feeling, and the subsequent weaving produces a super cotton-like fabric. This fabric not only resembles cotton fabric in terms of fiber surface and fabric style, but also the fabric products have a cotton-like or super cotton-like effect in terms of performance and function. At the same time, it also has excellent properties such as high strength, large shrinkage rate difference, low cost, easy product conversion, and good cotton-like effect of fine denier fibers.

[0042] Preferably, the oil content of the FDY fiber after oiling by the integrated oil nozzle in the step S2 is 0.3 - 0.4%.

[0043] When producing POY / FDY conjugated filaments of fine and low denier varieties, the FDY fibers need to be false-twisted and drawn thinner again to improve the softness and fluffiness of the cotton-like fibers. However, the oil content of FDY polyester drawn filaments in the prior art is basically above 0.8%. When FDY and POY enter the hot box simultaneously in the third step, and the texturing hot box is about 180°C, it will cause the volatilization and decomposition of the oil agent, and problems such as a large amount of oil fume and coking are likely to occur, resulting in problems such as many broken ends and poor dyeing during the production of super cotton-like polyester fibers. If the oil content is 0.3 - 0.4% in the conventional process, the production stability is extremely poor, the tow shakes severely on the hot roller winding, and the silk path is unstable, resulting in uneven heat absorption, which in turn affects the unevenness of fiber physical indexes and poor dyeing. Therefore, in order to solve the above technical problems simultaneously, while changing the process route, that is, when adopting the production process flow of FDY polyester drawn filaments of this patent, an atomizing device is added in the fiber cooling stage to improve the antistatic property of the non-oiled tow. Therefore, when the oil content of FDY fibers can be controlled at 0.3 - 0.4%, that is, similar to the oil content of POY, the above technical problems can be solved simultaneously.

[0044] In the cooling and forming of the FDY polyester drawn filaments, a ring blowing cylinder is used for cooling. An atomizing device is arranged below the blowing cylinder. The conveying direction of the atomizing device is parallel to the direction of the tow. An antistatic aqueous solution is added to the water tank in the atomizing device, and the proportion of the antistatic aqueous solution is 3 - 5%.

[0045] Due to the relatively high spinning speed of polyester drawn filaments, generally about 4000 m / min, the frictional force between the tows and between the tow and the porcelain parts is relatively large. The tow that has undergone high-speed friction is electrostatically charged, resulting in mutual repulsion between the tows. Although the conventional oil agent contains antistatic agents to solve this problem, in this process, no oil is applied in the spinning stage. Therefore, to improve the electrostatic problem, an atomizing device is installed below the ring blowing cylinder in the cooling and forming stage. The water mist conveying direction of the atomizing device is parallel to the direction of the tow. After the water mist with the antistatic aqueous solution is sprayed outwards by the atomizing device and contacts the tow, the spray pressure is generally 2 Mpa. After humidifying and removing static electricity from the tow by the atomizer, on the one hand, the humidity is increased to reduce static electricity; on the other hand, the humidity in the silk chamber is increased, and the temperature of the upper layer of the silk chamber is reduced, so that on the basis of the existing cooling, the cooling effect can be further improved, and the unevenness rate of the fiber strip is reduced. Among them, the proportion of the antistatic aqueous solution is 3 - 5%, which can achieve the above effects with a relatively small addition amount, making the production cost lower during preparation.

[0046] Further improvement is that the U-shaped wire guide includes a first U-shaped porcelain part and a second U-shaped porcelain part. The first U-shaped porcelain part and the second U-shaped porcelain part are installed in opposite directions, and the included angle is 10 - 15°.

[0047] It can improve the bundling property of the non-oiled tow.

[0048] Further improvement is made as follows: the temperatures of the second hot roller GR2 and the third hot roller GR3 are 50 - 70 °C, the temperatures of the fourth hot roller GR4 and the fifth hot roller GR5 are 120 - 140 °C, and the first godet roller GR1, the sixth godet roller GR6 and the seventh godet roller GR7 have no heating temperature; the second hot roller GR2, the third hot roller GR3, the fourth hot roller GR4 and the fifth hot roller GR5 are in a box, and an air guiding plate is provided between the third hot roller GR3 and the fourth hot roller GR4 to block the air flow with the air guiding plate.

[0049] To protect the heating effect of the hot rollers, in the prior art, these four hot rollers are in a box. Due to different temperatures, when the tow passes by at high speed, it is easy to cause air flow interference and vibration on the hot rollers. Therefore, an air guiding plate is placed between the third hot roller GR3 and the fourth hot roller GR4 to block the air flow. The air guiding plate structure for preventing air flow interference does not change the original production process conditions, and can enable the air flow generated by the self-rotation of the hot rollers to flow orderly in a predetermined direction and reduce the vibration of the fiber bundle on the surface of the hot rollers.

[0050] Further improvement is made as follows: the outer diameter of the first godet roller GR1 is 110 mm, and the contact length of the tow with the roller surface of the first godet roller GR1 is 25% of the roller outer diameter; the outer diameters of the second hot roller GR2 to the fifth hot roller GR5 are all 225 mm, and the contact lengths of the tow with the roller surfaces of the second hot roller GR2 to the fifth hot roller GR5 are all 65% of the roller outer diameter; the outer diameters of the sixth godet roller GR6 and the seventh godet roller GR7 are both 110 mm, and the contact lengths of the tow with the roller surfaces of the sixth godet roller GR6 and the seventh godet roller GR7 are both 50% of the roller outer diameter.

[0051] The above contact surface is the maximum surface contact between the tow and the hot roller without winding. After increasing the heat receiving points of the tow, when the temperatures of the second hot roller GR2 to the fifth hot roller GR5 are relatively low, the tow enters the glass transition temperature for stretching, which can improve the heat uniformity of the FDY fine denier fiber, and further improve the physical indexes and dyeing uniformity of the fiber.

[0052] A super cotton-like polyester fiber, which is a super cotton-like polyester fiber prepared by a production method of a super cotton-like polyester fiber, has a breaking strength ≥ 3.6 cN / dtex, an elongation at break of 14 - 18%, a crimp shrinkage rate of 14 - 16%, and a crimp stability ≥ 85%.

[0053] Specific examples of the super cotton-like polyester fiber prepared by the above production method of the super cotton-like polyester fiber are shown as Examples 1 - 5, and specific comparative examples of the super cotton-like polyester fiber prepared by the production method of the super cotton-like polyester fiber before improvement are shown as Comparative Examples 1 - 2:

[0054] Example 1:

[0055] POY polyester pre-oriented yarn with a linear density and number of holes of 138 dtex / 144 f, a breaking strength of 2.31 cN / dtex, an elongation at break of 126.1%, an evenness variation coefficient of 1.65 cV / %, and an oil content of 0.28% is produced through the POY polyester pre-oriented yarn production process. Then, FDY polyester drawn yarn with a linear density and number of holes of 83 dtex / 72 f, a breaking strength of 3.92 cN / dtex, an elongation at break of 28.1%, and an oil content of 0.32% is produced through the FDY polyester drawn yarn production process. Finally, the POY polyester pre-oriented yarn and the FDY polyester drawn yarn are mixed to form super imitation cotton polyester fiber. Among them, during the production process through the FDY polyester drawn yarn production process, the angle of the opposed U-shaped godet is 10°, the temperature of the second hot roller GR2 is 50°C, the temperature of the third hot roller GR3 is 50°C, the temperature of the fourth hot roller GR4 is 120°C, the temperature of the fifth hot roller GR5 is 120°C, and the percentage of the antistatic liquid in the atomizing device is 3%. The number of hairiness generated by the super imitation cotton polyester fiber produced by the above method in 24 hours at 18 spinning positions is 3, and the number of broken ends in 24 hours at 18 spinning positions is basically 0. The breaking strength of the super imitation cotton polyester fiber is 3.68 cN / dtex, the elongation at break is 14.5%, the crimp shrinkage rate is 15.1%, and the crimp stability is 89.1.

[0056] Compared with Example 1, Examples 2 to 5 are different in the changes of various data. The specific parameter selections and product performance results are shown in Table 1.

[0057] Comparative Example 1 is super imitation cotton polyester fiber produced by the existing process, and its various technical indicators are the same as those of Example 1. Due to the absence of an atomizing device and an antistatic solution, there are many hairiness and broken ends due to high static electricity during the FDY production process. The specific parameter selections and product performance results are shown in Table 1.

[0058] Comparative Example 2 is super imitation cotton polyester fiber produced by increasing the oil content to 0.91% and increasing the percentage of the antistatic liquid on the basis of Comparative Example 1. However, during the texturing production process of the super imitation cotton polyester fiber, the texturing hot box coking problem occurs only after 10 - 15 days of use.

[0059] Table 1

[0060]

[0061]

[0062]

[0063] By comparing Examples 1 to 5 and Comparative Examples 1 to 2 in Table 1, it can be seen that in Comparative Example 1 in the original process flow, when the oil content of FDY was the same as that in Example 1, the number of hairiness filaments was significantly more, resulting in a high breakage rate. This was mainly because the atomizing device and antistatic liquid were not added, resulting in a large frictional force between the non-oiled tow and the tow, and between the tow and the porcelain parts. The tow that had undergone high-speed friction carried static electricity, causing the tows to repel each other, thus causing hairiness and breakage. In Comparative Example 2, when the oil content increased to 0.91%, although the problems of breakage rate and hairiness were solved, it was easy to cause coking problems in the texturing hot box after only 10 - 15 days of using the super imitation cotton. After process improvement, the number of raw hairiness filaments and the breakage rate were basically negligible, and the performance of the final product itself could basically remain unchanged.

[0064] The above embodiments are only the preferred embodiments of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantive changes and substitutions made by those skilled in the art based on the present application fall within the scope of protection required by the present application.

Claims

1. A production method of super imitation cotton polyester fiber, characterized in that: The production method includes: S1. Producing POY polyester pre-oriented yarn: The production process of the POY polyester pre-oriented yarn is: polyester melt transportation → booster pump → melt cooling → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → spinning pack → ring blower → cooling and forming → oiling at the oil nozzle → spinning channel → first godet wheel → pre-network → second godet wheel → winding and forming; S2. Producing FDY polyester drawn yarn: The production process of the FDY polyester drawn yarn is: polymerization end polymerization kettle → melt distributor → booster pump → melt transportation → cooler → static mixer → melt distribution valve → spinning box → metering pump melt extrusion → component spinning → cooling and forming → atomization device → pre-network bunching → spinning channel → opposed U-shaped godet → first godet roller GR1 → second hot roller GR2 for heating and drawing → third hot roller GR3 for heating and drawing → air guiding plate → fourth hot roller GR4 for heating and setting → fifth hot roller GR5 for heating and setting → integrated oil nozzle for oiling → pre-network → sixth godet roller GR6 → main network → seventh godet roller GR7 → godet wheel → winding and forming; The oil content rate of the FDY after oiling by the integrated oil nozzle in step S2 is 0.3 - 0.4%; In the cooling and forming of the FDY polyester drawn yarn, a ring blower is used for cooling. An atomization device is provided below the blower. The conveying direction of the atomization device is parallel to the direction of the filament bundle. An antistatic aqueous solution is added to the water tank in the atomization device, and the proportion of the antistatic aqueous solution is 3 - 5%; The opposed U-shaped godet includes a first U-shaped porcelain part and a second U-shaped porcelain part. The first U-shaped porcelain part and the second U-shaped porcelain part are installed in opposite directions and have an included angle of 10 - 15°; The second hot roller GR2, the third hot roller GR3, the fourth hot roller GR4, and the fifth hot roller GR5 are in a box. An air guiding plate is provided between the third hot roller GR3 and the fourth hot roller GR4 to block the air flow; S3. POY polyester pre-oriented yarn and FDY polyester drawn yarn: The POY polyester pre-oriented yarn and the FDY polyester drawn yarn are subjected to texturing and mixed fiberization to form super imitation cotton polyester fiber.

2. A production method of super imitation cotton polyester fiber according to claim 1, characterized in that: The physical indexes of the POY polyester pre-oriented yarn are: 80 dtex ≤ linear density ≤ 250 dtex, 72 ≤ number of holes ≤ 288, breaking strength ≥ 2.1 cN / dtex, breaking elongation 126 - 130%, unevenness rate of evenness ≤ 1.8 cV / %; The physical indexes of the FDY polyester drawn yarn are: 40 dtex ≤ linear density ≤ 120 dtex, 36 ≤ number of holes ≤ 144, breaking strength ≥ 3.8 cN / dtex, breaking elongation 26 - 30%.

3. A production method of super imitation cotton polyester fiber according to claim 1, characterized in that: The blending process of the POY polyester pre-oriented yarn and the FDY polyester drawn yarn is as follows: POY and FDY combination → double yarn tubes → pre-positioned M-type network → tension adjusting rod → first roller → upper hot box → cooling plate → bi-directional false twister → leather roller type second roller → bi-directional network → apron type auxiliary second roller → out-of-box wire guiding system → apron type third roller → oiling system → winding and forming.

4. A production method of a super cotton-like polyester fiber according to claim 1, characterized in that: the temperatures of the second hot roller GR2 and the third hot roller GR3 are 50 - 70 °C, the temperatures of the fourth hot roller GR4 and the fifth hot roller GR5 are 120 - 140 °C, and the first wire guiding roller GR1, the sixth wire guiding roller GR6 and the seventh wire guiding roller GR7 have no heating temperature.

5. A production method of a super cotton-like polyester fiber according to claim 1, characterized in that: the outer diameter of the first wire guiding roller GR1 is 110 mm, and the contact length of the fiber bundle with the roller surface of the first wire guiding roller GR1 is 25% of the roller outer diameter; the outer diameters of the second hot roller GR2 to the fifth hot roller GR5 are all 225 mm, and the contact lengths of the fiber bundle with the roller surfaces of the second hot roller GR2 to the fifth hot roller GR5 are all 65% of the roller outer diameter; the outer diameters of the sixth wire guiding roller GR6 and the seventh wire guiding roller GR7 are both 110 mm, and the contact lengths of the fiber bundle with the roller surfaces of the sixth wire guiding roller GR6 and the seventh wire guiding roller GR7 are both 50% of the roller outer diameter.

6. A super cotton-like polyester fiber, characterized in that: the super cotton-like polyester fiber prepared by the production method of a super cotton-like polyester fiber according to any one of claims 1 to 5 has a breaking strength ≥ 3.6 cN / dtex, an elongation at break of 14 - 18%, a crimp shrinkage rate of 14 - 16%, and a crimp stability ≥ 85%.

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