Preparation method of coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn

Abstract

The present invention belongs to the technical field of polyester fibers and discloses a method for preparing a coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn. After the polyester melt is extruded through a trilobal special-shaped cross-section spinneret, the yarn is sequentially cooled, oiled, subjected to a spinning pre-network, a GR1A zone, a GR2 zone, a GR1B zone, a winding pre-network, a GR3 zone, and finally wound to produce the coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn. The oiling nozzle includes an oil injection hole and a yarn path, and the longitudinal section of the yarn path is a semi-closed circle along a direction perpendicular to the length of the yarn path. The diameters of the godet rollers in the GR1A zone and the GR2 zone are equal, the diameter of the godet roller in the GR1B zone is larger than that of the godet roller in the GR1A zone, and the surface linear velocity of the godet roller in the GR2 zone is greater than that of the godet roller in the GR1A zone. The method of the present invention can effectively improve the permeability and uniformity of the oil agent, avoiding the problem of uneven oil application.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester fibers and relates to a method for preparing coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn. Background Art

[0002] The oiling step is crucial in the production process of coarse-denier trilobal, shaped, lustrous polyester pre-oriented yarn. However, while using crude oil directly for oiling can improve post-processing yields, the inherent viscosity, high levels of impurities, and poor thermal stability of crude oil make it difficult to evenly distribute the crude oil across the fiber surface, leading to uneven oiling. Furthermore, during the spinning process, the fibers undergo high-temperature treatment. For example, when passing through heated rollers, certain components in the crude oil may undergo chemical reactions at high temperatures, altering or destabilizing the fiber's properties. This not only affects the fiber's physical properties but can also adversely affect its dyeability and thermal stability.

[0003] Therefore, the conventional oiling method for coarse-denier trilobal, shaped, glossy polyester pre-oriented yarns typically involves diluting crude oil with deionized water at a specific ratio to a concentration of 9-10%. The yarns are then oiled using an oil pump and nozzle. However, this method results in a relatively high water content in the finished polyester pre-oriented yarn. In particular, the trilobal cross-section includes three angles, making it difficult for the yarns to effectively remove stored moisture when passing through ceramic components such as wire guides, further exacerbating the moisture content issue in coarse-denier trilobal, glossy polyester pre-oriented yarns. Furthermore, trilobal, glossy polyester pre-oriented yarns produced in this manner are prone to underweighting during long-term storage due to the prolonged storage time and high temperatures. Furthermore, this high moisture content can lead to low yields for downstream customers due to evaporation of the moisture after post-processing in a high-temperature texturing oven.

[0004] In order to solve the above problems, two solutions have been attempted in the prior art.

[0005] The first method is to reduce the aspect ratio of the leaf length and leaf width of the trilobal shaped fiber, but the change in the aspect ratio will lead to a change in the degree of irregularity. If the aspect ratio is too small, the polyester melt will easily form a cross-section close to a triangle after expansion, affecting its unique longitudinal concave and convex morphological structure and resulting in a decrease in the degree of irregularity.

[0006] The second method is to increase the oil concentration of the oiling agent on the basis of keeping the cross section unchanged. However, since the polyester pre-oriented yarn is oiled after cooling and the yarn speed is as high as 3000-5000 m / min, and the lower cooling temperature and higher oil concentration will affect the fluidity and permeability of the oil, it is easy to cause uneven oiling. For example, in the literature (Improvement of the processing quality of 55dtex / 72f fine denier yarn after full matting [J]. Polyester Industry. 2018, 31(1):33-36), the oil concentration was increased, but the increase in the oil concentration also affected the fluidity and permeability of the oil, resulting in the problem of uneven oiling.

[0007] Therefore, it is of great significance to study a preparation method of coarse denier trilobal special-shaped bright polyester pre-oriented yarn to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A method for preparing a coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn comprises the following steps: after a polyester melt is extruded through a trilobal special-shaped spinneret, the yarn is sequentially subjected to cooling, oiling, a spinning pre-network, a GR1 A zone, GR2, a GR1 B zone, a winding pre-network, GR3, and winding to obtain the coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn;

[0011] The oiling is carried out using crude oil (the effective components of the crude oil are 90-93wt%, and the remaining 7-10wt% are some oil solvents, dispersants, antistatic agents and other substances). The oiling method is oiling with an oil nozzle. The oil nozzle includes an oil injection hole and a wire path. Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle. The semi-closed circle consists of two semicircles and two straight segments. The two straight segments are respectively connected to one end of each of the two semicircles. The other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape.

[0012] The oil splashing is not regular and controllable, especially for special-shaped cross-sections affected by the degree of special shape and high oil content, the splashing problem is more serious. Figure 1As shown in the figure, splashing oil will cause a local decrease in the total amount of oil applied. Since the splashing is uncontrollable, the oil application cannot be replenished, resulting in a low oil application rate on the yarn bundle and uneven oiling. Although the present invention cannot completely avoid the problem of oil splashing, the unique oil nozzle structure design can block the splashing oil and quickly return it to the yarn path and then to the yarn bundle, improving the oiling efficiency. The subsequent pre-network oil homogenization can also ensure that the oil is evenly distributed.

[0013] The oiling temperature is 57-60℃;

[0014] The spinning pre-network adopts constant temperature air supply, and the air temperature is equal to the oiling temperature;

[0015] The present invention performs pre-networking after spinning oiling (i.e., a pre-network is installed under the spinning oil nozzle), rather than performing pre-networking after the tow passes through the tunnel. At the same time, the spinning pre-network adopts constant temperature air supply and controls the air temperature to be equal to the oiling temperature. This is because after the tow is oiled, the oil temperature has not yet dropped. At this time, it quickly enters the pre-network of heated compressed air. Before the oil temperature drops, the heated compressed air is immediately sprayed through the pre-network to homogenize the oil on the tow, which can ensure the activity of the oil molecules and improve the penetration efficiency. In the oil-free drafting technology of the prior art, there is also a pre-network in the spinning stage. Since the tow is not oiled, the pre-network is used to improve the cohesion, thereby facilitating the subsequent drafting. This is completely different from the present invention (the spinning pre-network of the present invention is to improve the permeability of crude oil and to prevent the unpenetrated oil from being blown away by heating the compressed air, thereby affecting the oiling uniformity of the tow).

[0016] The tow first passes through GR1 A, then GR2, then GR1 B, and then through pre-interlacing and GR3 before reaching the winder. Compared with the existing process flow of "cooling → oiling → winding pre-interlacing → GR1 → GR2 → winding", the tow's travel on the godet rollers is significantly increased. The main purpose of increasing the travel is to increase the oil's penetration time between the monofilaments and improve the penetration rate.

[0017] The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet roller in GR1 A zone is equal to that of the GR2 godet roller. The diameter of the godet roller in GR1 B zone is 0.80-0.90 mm larger than that of the godet roller in GR1 A zone. The surface linear speed of the GR2 godet roller is 9.45-10.64 m / min larger than that of the GR1 A zone. Since the godet rollers in GR1 A zone and GR1 B zone share a motor, the set rotation speeds are consistent. By controlling the difference in diameters between the two ends of the godet rollers in GR1 A zone and GR1 B zone, the purpose of inconsistent linear speeds of the yarn on the surface of the godet roller can be achieved. Under the same rotation speed, by setting the diameter of the godet roller in GR1 B zone to be 0.80-0.90 mm larger than that of the godet roller in GR1 A zone, the linear speed of the yarn on the surface of the godet roller differs by about 18.9-21.28 m / min. Then, by setting the surface linear speed of the GR2 godet roller to be 0.80-0.90 mm larger than that of the GR1 Zone A is 9.45-10.64 m / min higher than GR1 Zone B, which is 9.45-10.64 m / min lower. This speed difference ensures that the tension in Zones GR1A→GR2 and GR2→GR1B is maintained at the level required by the process. This is mainly because the coarse denier trilobal fiber has a large specific surface area, which increases the frictional resistance with the air and the godet rollers. This can easily cause the tow to shake and wrap around the godet rollers, resulting in single filament breakage and fluff. By setting this speed difference, the tow tension is stabilized, which can reduce the coarse denier trilobal fiber's shaking or wrapping around the godet rollers, thereby reducing the number of fluffy fibers.

[0018] As the preferred technical solution:

[0019] The method for preparing the coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn is as described above. The oil content of the coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn is 0.30-0.40 wt%.

[0020] In the method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, the oil injection hole is circular with a hole diameter of 0.4-0.6 mm; the diameters of the two semicircles are equal, and the semicircle diameters are 3.8-4.2 mm; and the V-shaped angle is 19-21 degrees.

[0021] In the above-described method for preparing coarse-denier trilobal, shaped, lustrous polyester pre-oriented yarn, the spinning pre-netting device is installed 45 to 55 cm below the oil nozzle. If the installation distance is less than 45 cm, it is easily affected by the cooling air, which reduces the temperature of the pre-netting air pressure and affects the fluidity and permeability of the oil in the fiber. If the installation distance is greater than 55 cm, it is easily affected by the air pressure at the tunnel entrance, causing fiber shaking and affecting the winding tension. At the same time, the network device obtains a constant temperature air supply through a temperature-controlled compressed air system; the temperature-controlled compressed air system includes a pressure regulating valve, an insulated air pipe, a heat exchange device, and a temperature sensor.

[0022] The network device is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device, the insulated gas pipe is equipped with a pressure regulating valve, a heat exchange device and a temperature sensor in sequence;

[0023] The pressure regulating valve is used to pressurize the gas delivered by the gas source to obtain compressed air. The heat exchange device includes a water pipe and a water inlet valve. Hot water flows through the water pipe, and the heat exchange device exchanges heat with the compressed air passing through the heat exchange device through the hot water in the water pipe. The water inlet valve is installed on the hot water pipe and is used to control the flow of hot water entering the water pipe to adjust the temperature of the compressed air. The greater the water inlet, the higher the compressed air temperature, and vice versa.

[0024] The temperature controller is electrically connected to the temperature sensor and the water inlet valve respectively. The temperature sensor is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature controller. The temperature controller compares the detection result with the set temperature. When the two are not equal, the temperature controller controls the opening of the water inlet valve to adjust the temperature of the compressed air.

[0025] In the above-mentioned method for preparing a coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn, the temperature sensor is arranged at the connection between the heat-insulating air pipe and the network device. Such a design can better control the temperature of the compressed gas entering the network device.

[0026] As described above, the preparation method of a coarse denier three-leaf special-shaped bright polyester pre-oriented yarn, the air pressure of the spinning pre-network is 0.18~0.22MPa, the air temperature of the winding pre-network is 25~30℃, the air pressure of the winding pre-network is 0.08~0.1MPa, the network devices used for the spinning pre-network and the winding pre-network are the same, the nozzle aperture is 1.3mm, and the nozzle is used to eject air flow to pre-network the filament bundle.

[0027] According to the above-mentioned method for preparing a coarse denier three-lobed special-shaped bright polyester pre-oriented yarn, the lengths of the GR1 A zone godet, the GR1 B zone godet, the GR2 godet, and the GR3 godet are all 80 mm; the distance between the central axis of the GR1 A zone godet and the central axis of the GR2 godet is 1.3 m, the distance between the central axis of the GR2 godet and the central axis of the GR1 B zone godet is 1.3 m, and the distance between the central axis of the GR1 B zone godet and the central axis of the GR3 godet is 1.5 m. With this design, the total travel of the yarn bundle between the godet discs is approximately 4.1 m; the spinning process of the prior art is: spinning cooling → oiling → winding pre-network → GR1 → GR2 → winding, the distance GR1 → GR2 is 1.5 m, and the travel of the yarn bundle between the two godet discs is approximately 1.5 m. Compared with the prior art, the present invention increases the travel of the yarn bundle between the guide discs, increases the penetration time of the oil agent between the monofilaments, and improves the permeability. At the same time, adding a second pre-net before the GR3 godet allows the tow to be further oiled and homogenized as it passes through the second pre-net. The large surface area of ​​coarse trilobal fibers increases friction as the tow passes through the guide porcelain, leading to problems such as loose and fuzzy yarns. By increasing the total travel of the tow between the godets and adding a second pre-net, oil penetration is improved, which increases the oil film strength on the fiber surface and the cohesion between the individual yarns, thereby reducing the number of fuzzy and loose yarns.

[0028] A method for preparing a coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn as described in any one of the above items, wherein the specification of the coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn is 545-1050 dtex / 96-192f.

[0029] The method for preparing a coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn as described above has the following characteristics: the degradation rate of the hair yarn and the loose loop yarn of the coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn is ≤0.3%, the oiling efficiency is ≥98%, the oil content deviation is ≤0.03%, and the winding tension deviation rate is ≤5%.

[0030] Beneficial effects:

[0031] (1) The present invention can block the splashing oil agent through the structural design of the oil nozzle and quickly flow it back into the silk path and then back to the silk bundle, thereby improving the oiling efficiency. The oil agent can be evenly distributed through the subsequent pre-network oil agent homogenization, thereby improving the fiber cohesion and reducing the number of hairy yarns and loose yarns.

[0032] (2) By adjusting the position of the pre-network and controlling its air temperature to be equal to the oiling temperature, the present invention can spray heated compressed air through the pre-network immediately before the oil temperature drops to homogenize the oil on the filament bundle, thereby ensuring the activity of the oil molecules and improving the penetration efficiency.

[0033] (3) The present invention increases the stroke of the filament bundle on the guide roller and sets the speed difference of each roller, which can reduce the winding tension deviation rate. Increasing the stroke is equivalent to increasing the penetration time of the oil agent between the monofilaments, improving the permeability, and avoiding the problem of unstable dyeing caused by chemical reaction of crude oil adhering to the fiber surface when passing through the high-temperature hot roller.

[0034] (4) The present invention improves the oil permeability and uniformity by pre-network heating, making the glass transition state more uniform when the hot roller is heated, and ultimately improving the dyeing performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an open fuel injection nozzle in the prior art;

[0036] Figure 2 Schematic diagram of a semi-enclosed fuel injection nozzle of the present invention;

[0037] Figure 3 Schematic diagram of the temperature-controlled compressed air system of the present invention;

[0038] Figure 4 Schematic diagram of the travel of the yarn tow from GR1 A area to GR3 of the present invention;

[0039] Among them, 1-pressure regulating valve, 2-heat exchange device, 3-water pipe, 4-water inlet valve, 5-temperature controller, 6-temperature sensor, 7-network device, 8-GR1 A area, 9-GR1 B area, 10-GR2, 11-GR3. DETAILED DESCRIPTION

[0040] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0041] The testing methods for the relevant performance indicators in the following embodiments and comparative examples are as follows:

[0042] Downgrade rate of hairy yarn and loose loop yarn: The calculation formula is: Downgrade rate of hairy yarn and loose loop yarn = (number of hairy yarns downgraded + number of loose loop yarns downgraded) / total number of yarns × 100%, where hairy yarn refers to the yarn bundle with fuzzy phenomenon or the broken ends of single yarn protruding from the surface of multifilament yarn. When one or more hairy yarns appear, the yarn will be downgraded and the number of hairy yarns downgraded will be recorded; loose loop yarn refers to the single yarn exposed from the end surface of the package in an arc or loop shape and without breakage. If two loose loops appear, the yarn will be downgraded and the number of loose loop yarns downgraded will be recorded.

[0043] Oiling efficiency: 2 g of the coarse denier trilobal special-shaped bright polyester pre-oriented yarn prepared in each embodiment was taken as a sample, and the measured oil content of the sample was tested using an MQC23-10 nuclear magnetic resonance oil content analyzer according to the nuclear magnetic resonance method in the GB / T 6504-2017 "Test Method for Oil Content of Chemical Fibers" standard. The measured oil content was then calculated with the theoretical oil content (theoretical oil content = (oil pump speed × 1.003 × oil concentration × oil pump specification) ÷ metering pump supply × 100%, where 1.003 is the oil specific gravity) to obtain the oiling efficiency. The calculation formula for the oiling efficiency is: Oiling efficiency = measured oil content × 100% / theoretical oil content.

[0044] Oil content deviation: The coarse denier trilobal special-shaped bright polyester pre-oriented yarn prepared in each embodiment was taken as a sample and the oil content was tested, and then the oil content deviation was calculated. The calculation formula for the oil content deviation is: Oil content deviation = measured oil content - oil content center value.

[0045] Winding tension deviation rate: In the process of winding the coarse denier trilobal special-shaped glossy polyester pre-oriented yarn in each embodiment, a TENSIONSTAR TS205P400 tensiometer was used to test the measured winding tension. The specific process was as follows: first start the tensiometer, and when the screen displays a number of 0.00, press the coarse denier trilobal special-shaped glossy polyester pre-oriented yarn onto the pressure sensing rod with the tensiometer clamp, and then read the tension value. The winding tension deviation rate was calculated based on the measured winding tension, and the calculation formula was: Winding tension deviation rate = (measured winding tension - winding tension center value) / winding tension center value × 100%.

[0046] Example 1

[0047] A method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, comprising the following steps:

[0048] The polyester melt (made by polycondensation of PTA and EG, with PTA accounting for 70% by mass) with an intrinsic viscosity of 0.61 dL / g after being metered by a metering pump was extruded through a trilobal special-shaped cross-section spinneret, and then sequentially cooled, oiled, spun pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier trilobal special-shaped bright polyester pre-oriented yarn (the yarn tow's journey from GR1 A zone to GR3 is as follows Figure 4As shown, it passes through GR1 A zone 8, GR2 10, GR1B zone 9, and GR3 11 in sequence); wherein, the air pressure of the spinning pre-network is 0.18 MPa, the air temperature of the winding pre-network is 25°C, the air pressure of the winding pre-network is 0.08 MPa, the oiling temperature is 57°C, the oil pump specification is 0.03 cc / r, the oil pump speed is 19.7 rpm, the pump supply of the metering pump is 158.05 g / min, the oil content center value is set to 0.30%, and the winding tension center value (M) is 65 cN;

[0049] The oiling is done with crude oil (polyester FDY oil, manufactured by Tongxiang Henglong Chemical Co., Ltd., brand TK-1009TM, with a measured oil concentration of 90%), and the oiling method is oiling with an oil spray nozzle;

[0050] like Figure 2 As shown, the fuel injection nozzle includes a fuel injection hole and a wire channel. The fuel injection hole is circular with a hole diameter of 0.4 mm.

[0051] Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle, which is composed of two semicircles and two straight segments. The two straight segments are respectively connected to one end of the two semicircles, and the other end of the two semicircles is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape.

[0052] The diameters of the two semicircles are equal, and the semicircle diameter is 3.8mm; the angle of the V-shape is 19°;

[0053] The network device used in the spinning pre-network was installed 45 cm below the nozzle;

[0054] The network device obtains constant temperature air supply through the temperature-controlled compressed air system, and the air temperature is equal to the oiling temperature;

[0055] like Figure 3 As shown, the temperature-controlled compressed air system includes a pressure regulating valve 1, an insulated air pipe, a heat exchange device 2 and a temperature sensor 6;

[0056] The network device 7 is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device 7, the insulated gas pipe is provided with a pressure regulating valve 1, a heat exchange device 2 and a temperature sensor 6 in sequence;

[0057] The pressure regulating valve 1 is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device 2 includes a water pipe 3 and a water inlet valve 4; hot water flows through the water pipe 3, and the heat exchange device 2 exchanges heat with the compressed air passing through the heat exchange device 2 through the hot water in the water pipe 3; the water inlet valve 4 is installed on the water pipe 3 and is used to control the flow of hot water entering the water pipe 3 to adjust the temperature of the compressed air;

[0058] The temperature sensor 6 is provided at the connection between the heat-insulating air pipe and the network device 7;

[0059] The temperature control meter 5 is electrically connected to the temperature sensor 6 and the water inlet valve 4 respectively. The temperature sensor 6 is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature control meter 5. The temperature control meter 5 compares the detection result with the set temperature. When the two are not equal, the temperature control meter 5 controls the opening of the water inlet valve 4 to adjust the temperature of the compressed air;

[0060] The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet rollers in GR1 A zone is equal to that of the GR2 godet roller. The diameter of the godet rollers in GR1 B zone is 0.8 mm larger than that of the GR1 A zone. The surface linear speed of the GR2 godet roller is 9.45 m / min higher than that of the GR1 A zone godet roller.

[0061] The lengths of the GR1 A zone godet, GR1 B zone godet, GR2 godet, and GR3 godet are all 80 mm; the distance between the center axis of the GR1 A zone godet and the center axis of the GR2 godet is 1.3 m, the distance between the center axis of the GR2 godet and the center axis of the GR1 B zone godet is 1.3 m, and the distance between the center axis of the GR1 B zone godet and the center axis of the GR3 godet is 1.5 m.

[0062] The final coarse denier three-lobed special-shaped bright polyester pre-oriented yarn has a specification of 545dtex / 96f, an oil content of 0.3wt%, a degradation rate of hair yarn and loose loop yarn of 0.21%, an oiling efficiency of 98.8%, an oil content deviation of 0%, and a winding tension deviation rate of 2%.

[0063] Example 2

[0064] A method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, comprising the following steps:

[0065] A polyester melt (formed by polycondensation of PTA and EG, with PTA accounting for 70.3% by mass) with an intrinsic viscosity of 0.615 dL / g after being metered by a metering pump is extruded through a trilobal special-shaped cross-section spinneret, and then sequentially subjected to cooling, oiling, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier trilobal special-shaped bright polyester pre-oriented yarn; wherein, the air pressure of the spinning pre-network is 0.2 MPa, the air temperature of the winding pre-network is 28°C, the air pressure of the winding pre-network is 0.1 MPa, the oiling temperature is 58°C, the oil pump specification is 0.03 cc / r, the oil pump speed is 23.1 rpm, the pump supply of the metering pump is 169.94 g / min, the oil content center value is set to 0.32%, and the winding tension center value is 68 cN;

[0066] The oiling is done with crude oil (polyester FDY oil, manufactured by Tongxiang Henglong Chemical Co., Ltd., brand TK-1009TM, with a measured oil concentration of 91%), and the oiling method is oiling with an oil spray nozzle;

[0067] The fuel injection nozzle includes a fuel injection hole and a wire channel. The fuel injection hole is circular with a hole diameter of 0.5mm.

[0068] Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle, which is composed of two semicircles and two straight segments. The two straight segments are respectively connected to one end of the two semicircles, and the other end of the two semicircles is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape.

[0069] The diameters of the two semicircles are equal, and the diameter of the semicircle is 4mm; the angle of the V-shape is 20°;

[0070] The network device used in the spinning pre-network was installed 50 cm below the nozzle;

[0071] The network device obtains constant temperature air supply through the temperature-controlled compressed air system, and the air temperature is equal to the oiling temperature;

[0072] The temperature-controlled compressed air system includes a pressure regulating valve, an insulated gas pipe, a heat exchange device and a temperature sensor;

[0073] The network device is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device, the insulated gas pipe is equipped with a pressure regulating valve, a heat exchange device and a temperature sensor in sequence;

[0074] The pressure regulating valve is used to pressurize the gas delivered by the gas source to obtain compressed air. The heat exchange device includes a water pipe and a water inlet valve. Hot water flows through the water pipe, and the heat exchange device exchanges heat with the compressed air passing through the heat exchange device through the hot water in the water pipe. The water inlet valve is installed on the hot water pipe and is used to control the flow of hot water entering the water pipe to adjust the temperature of the compressed air.

[0075] The temperature sensor is arranged at the connection between the heat-insulated air pipe and the network device;

[0076] The temperature controller is electrically connected to the temperature sensor and the water inlet valve. The temperature sensor is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature controller. The temperature controller compares the detection result with the set temperature. When the two are not equal, the temperature controller controls the opening of the water inlet valve to adjust the temperature of the compressed air.

[0077] The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet roller in GR1 A zone is equal to that of the godet roller in GR2. The diameter of the godet roller in GR1 B zone is 0.82 mm larger than that in GR1 A zone. The surface linear speed of the godet roller in GR2 zone is 9.69 m / min larger than that in GR1 A zone.

[0078] The lengths of the GR1 A zone godet, GR1 B zone godet, GR2 godet, and GR3 godet are all 80 mm; the distance between the center axis of the GR1 A zone godet and the center axis of the GR2 godet is 1.3 m, the distance between the center axis of the GR2 godet and the center axis of the GR1 B zone godet is 1.3 m, and the distance between the center axis of the GR1 B zone godet and the center axis of the GR3 godet is 1.5 m.

[0079] The final coarse denier three-lobed special-shaped bright polyester pre-oriented yarn has a specification of 580dtex / 96f, an oil content of 0.33wt%, a degradation rate of hair and loose yarn of 0.26%, an oiling efficiency of 99.1%, an oil content deviation of 0.01%, and a winding tension deviation rate of 2%.

[0080] Example 3

[0081] A method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, comprising the following steps:

[0082] A polyester melt (formed by polycondensation of PTA and EG, with PTA accounting for 70.5% by mass) with an intrinsic viscosity of 0.618 dL / g after being metered by a metering pump is extruded through a trilobal special-section spinneret, and then sequentially subjected to cooling, oiling, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier trilobal special-shaped bright polyester pre-oriented yarn; wherein, the air pressure of the spinning pre-network is 0.22 MPa, the air temperature of the winding pre-network is 30°C, the air pressure of the winding pre-network is 0.09 MPa, the oiling temperature is 60°C, the oil pump specification is 0.05 cc / r, the oil pump speed is 22.0 rpm, the pump supply of the metering pump is 225.13 g / min, the oil content center value is set to 0.38%, and the winding tension center value is 70 cN;

[0083] The oiling is done with crude oil (polyester FDY oil, manufactured by Tongxiang Henglong Chemical Co., Ltd., brand TK-1009TM, with a measured oil concentration of 92%), and the oiling method is oiling with an oil spray nozzle;

[0084] The fuel injection nozzle includes a fuel injection hole and a wire channel. The fuel injection hole is circular with a hole diameter of 0.6mm.

[0085] Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle, which is composed of two semicircles and two straight segments. The two straight segments are respectively connected to one end of the two semicircles, and the other end of the two semicircles is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape.

[0086] The diameters of the two semicircles are equal, and the semicircle diameter is 4.2mm; the V-shaped angle is 21°;

[0087] The network device used in the spinning pre-network was installed 55 cm below the nozzle;

[0088] The network device obtains constant temperature air supply through the temperature-controlled compressed air system, and the air temperature is equal to the oiling temperature;

[0089] The temperature-controlled compressed air system includes a pressure regulating valve, an insulated gas pipe, a heat exchange device and a temperature sensor;

[0090] The network device is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device, the insulated gas pipe is equipped with a pressure regulating valve, a heat exchange device and a temperature sensor in sequence;

[0091] The pressure regulating valve is used to pressurize the gas delivered by the gas source to obtain compressed air. The heat exchange device includes a water pipe and a water inlet valve. Hot water flows through the water pipe, and the heat exchange device exchanges heat with the compressed air passing through the heat exchange device through the hot water in the water pipe. The water inlet valve is installed on the hot water pipe and is used to control the flow of hot water entering the water pipe to adjust the temperature of the compressed air.

[0092] The temperature sensor is arranged at the connection between the heat-insulated air pipe and the network device;

[0093] The temperature controller is electrically connected to the temperature sensor and the water inlet valve. The temperature sensor is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature controller. The temperature controller compares the detection result with the set temperature. When the two are not equal, the temperature controller controls the opening of the water inlet valve to adjust the temperature of the compressed air.

[0094] The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet roller in GR1 A zone is equal to that of the GR2 godet roller. The diameter of the godet roller in GR1 B zone is 0.85 mm larger than that in GR1 A zone. The surface linear speed of the GR2 godet roller is 10.05 m / min higher than that in GR1 A zone.

[0095] The lengths of the GR1 A zone godet, GR1 B zone godet, GR2 godet, and GR3 godet are all 80 mm; the distance between the center axis of the GR1 A zone godet and the center axis of the GR2 godet is 1.3 m, the distance between the center axis of the GR2 godet and the center axis of the GR1 B zone godet is 1.3 m, and the distance between the center axis of the GR1 B zone godet and the center axis of the GR3 godet is 1.5 m.

[0096] The final coarse denier three-lobed special-shaped bright polyester pre-oriented yarn has a specification of 758dtex / 192f, an oil content of 0.4wt%, a degradation rate of hair and loose yarn of 0.19%, an oiling efficiency of 98.5%, an oil content deviation of 0.02%, and a winding tension deviation rate of 2%.

[0097] Example 4

[0098] A method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, comprising the following steps:

[0099] A polyester melt (formed by polycondensation of PTA and EG, with PTA accounting for 70.8% by mass) with an intrinsic viscosity of 0.621 dL / g after being metered by a metering pump was extruded through a trilobal special-section spinneret, and then sequentially subjected to cooling, oiling, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier trilobal special-shaped bright polyester pre-oriented yarn; wherein, the air pressure of the spinning pre-network is 0.2 MPa, the air temperature of the winding pre-network is 27°C, the air pressure of the winding pre-network is 0.09 MPa, the oiling temperature is 59°C, the oil pump specification is 0.05 cc / r, the oil pump speed is 24.6 rpm, the pump supply of the metering pump is 290.47 g / min, the oil content center value is set to 0.36%, and the winding tension center value is 85 cN;

[0100] The oiling is done with crude oil (polyester FDY oil, manufactured by Tongxiang Henglong Chemical Co., Ltd., brand TK-1009TM, with a measured oil concentration of 93%), and the oiling method is oiling with an oil spray nozzle;

[0101] The fuel injection nozzle includes a fuel injection hole and a wire channel. The fuel injection hole is circular with a hole diameter of 0.5mm.

[0102] Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle, which is composed of two semicircles and two straight segments. The two straight segments are respectively connected to one end of the two semicircles, and the other end of the two semicircles is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape.

[0103] The diameters of the two semicircles are equal, and the semicircle diameter is 3.9mm; the V-shaped angle is 20°;

[0104] The network device used in the spinning pre-network was installed 48 cm below the nozzle;

[0105] The network device obtains constant temperature air supply through the temperature-controlled compressed air system, and the air temperature is equal to the oiling temperature;

[0106] The temperature-controlled compressed air system includes a pressure regulating valve, an insulated gas pipe, a heat exchange device and a temperature sensor;

[0107] The network device is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device, the insulated gas pipe is equipped with a pressure regulating valve, a heat exchange device and a temperature sensor in sequence;

[0108] The pressure regulating valve is used to pressurize the gas delivered by the gas source to obtain compressed air. The heat exchange device includes a water pipe and a water inlet valve. Hot water flows through the water pipe, and the heat exchange device exchanges heat with the compressed air passing through the heat exchange device through the hot water in the water pipe. The water inlet valve is installed on the hot water pipe and is used to control the flow of hot water entering the water pipe to adjust the temperature of the compressed air.

[0109] The temperature sensor is arranged at the connection between the heat-insulated air pipe and the network device;

[0110] The temperature controller is electrically connected to the temperature sensor and the water inlet valve. The temperature sensor is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature controller. The temperature controller compares the detection result with the set temperature. When the two are not equal, the temperature controller controls the opening of the water inlet valve to adjust the temperature of the compressed air.

[0111] The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet roller in GR1 A zone is equal to that of the godet roller in GR2. The diameter of the godet roller in GR1 B zone is 0.88 mm larger than that in GR1 A zone. The surface linear speed of the godet roller in GR2 zone is 10.4 m / min higher than that in GR1 A zone.

[0112] The lengths of the GR1 A zone godet, GR1 B zone godet, GR2 godet, and GR3 godet are all 80 mm; the distance between the center axis of the GR1 A zone godet and the center axis of the GR2 godet is 1.3 m, the distance between the center axis of the GR2 godet and the center axis of the GR1 B zone godet is 1.3 m, and the distance between the center axis of the GR1 B zone godet and the center axis of the GR3 godet is 1.5 m.

[0113] The final coarse denier three-lobed special-shaped bright polyester pre-oriented yarn has a specification of 965dtex / 192f, an oil content of 0.35wt%, a degradation rate of hair and loose yarn of 0.24%, an oiling efficiency of 98.7%, an oil content deviation of 0.01%, and a winding tension deviation rate of 3%.

[0114] Example 5

[0115] A method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, comprising the following steps:

[0116] A polyester melt (formed by polycondensation of PTA and EG, with PTA accounting for 71% by mass) with an intrinsic viscosity of 0.625 dL / g after being metered by a metering pump is extruded through a trilobal special-section spinneret, and then sequentially subjected to cooling, oiling, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier trilobal special-shaped bright polyester pre-oriented yarn; wherein, the air pressure of the spinning pre-network is 0.19 MPa, the air temperature of the winding pre-network is 30°C, the air pressure of the winding pre-network is 0.1 MPa, the oiling temperature is 60°C, the oil pump specification is 0.05 cc / r, the oil pump speed is 27.4 rpm, the pump supply of the metering pump is 320.25 g / min, the oil content center value is set to 0.36%, and the winding tension center value is 90 cN;

[0117] The oiling is done with crude oil (polyester FDY oil, manufactured by Tongxiang Henglong Chemical Co., Ltd., brand TK-1009TM, with a measured oil concentration of 92%), and the oiling method is oiling with an oil spray nozzle;

[0118] The fuel injection nozzle includes a fuel injection hole and a wire channel. The fuel injection hole is circular with a hole diameter of 0.6mm.

[0119] Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle, which is composed of two semicircles and two straight segments. The two straight segments are respectively connected to one end of the two semicircles, and the other end of the two semicircles is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape.

[0120] The diameters of the two semicircles are equal, and the semicircle diameter is 4.1mm; the angle of the V-shape is 21°;

[0121] The network device used in the spinning pre-network was installed 52 cm below the nozzle;

[0122] The network device obtains constant temperature air supply through the temperature-controlled compressed air system, and the air temperature is equal to the oiling temperature;

[0123] The temperature-controlled compressed air system includes a pressure regulating valve, an insulated gas pipe, a heat exchange device and a temperature sensor;

[0124] The network device is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device, the insulated gas pipe is equipped with a pressure regulating valve, a heat exchange device and a temperature sensor in sequence;

[0125] The pressure regulating valve is used to pressurize the gas delivered by the gas source to obtain compressed air. The heat exchange device includes a water pipe and a water inlet valve. Hot water flows through the water pipe, and the heat exchange device exchanges heat with the compressed air passing through the heat exchange device through the hot water in the water pipe. The water inlet valve is installed on the hot water pipe and is used to control the flow of hot water entering the water pipe to adjust the temperature of the compressed air.

[0126] The temperature sensor is arranged at the connection between the heat-insulated air pipe and the network device;

[0127] The temperature controller is electrically connected to the temperature sensor and the water inlet valve. The temperature sensor is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature controller. The temperature controller compares the detection result with the set temperature. When the two are not equal, the temperature controller controls the opening of the water inlet valve to adjust the temperature of the compressed air.

[0128] The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet roller in GR1 A zone is equal to that of the godet roller in GR2. The diameter of the godet roller in GR1 B zone is 0.9 mm larger than that in GR1 A zone. The surface linear speed of the godet roller in GR2 zone is 10.64 m / min larger than that in GR1 A zone.

[0129] The lengths of the GR1 A zone godet, GR1 B zone godet, GR2 godet, and GR3 godet are all 80 mm; the distance between the center axis of the GR1 A zone godet and the center axis of the GR2 godet is 1.3 m, the distance between the center axis of the GR2 godet and the center axis of the GR1 B zone godet is 1.3 m, and the distance between the center axis of the GR1 B zone godet and the center axis of the GR3 godet is 1.5 m.

[0130] The final coarse denier three-lobed special-shaped bright polyester pre-oriented yarn has a specification of 1050dtex / 192f, an oil content of 0.35wt%, a degradation rate of hair and loose yarn of 0.22%, an oiling efficiency of 98.8%, an oil content deviation of 0.01%, and a winding tension deviation rate of 3%.

Claims

1. A method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn, characterized by: After the polyester melt is extruded through a trilobal special-shaped spinneret, it is sequentially cooled, oiled, subjected to spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to produce a coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn. Crude oil is used for oiling, and the oiling method is oiling with an oil nozzle. The oil nozzle includes an oil injection hole and a wire path. Along the direction perpendicular to the length of the wire path, the longitudinal section of the wire path is a semi-closed circle. The semi-closed circle consists of two semicircles and two straight segments. The two straight segments are connected to one end of each semicircle, and the other end of each semicircle is connected to the orifice of the oil injection hole. The two straight segments are distributed in a V shape. The oil injection hole is circular with an aperture of 0.4-0.6mm; the diameters of the two semicircles are equal, and the semicircle diameters are 3.8-4.2mm; the angle of the V shape is 19-21°. The oiling temperature is 57~60℃; The spinning pre-network adopts constant temperature air supply, and the air temperature is equal to the oiling temperature; The network device used in the spinning pre-network is installed 45-55 cm below the nozzle. The network device obtains constant temperature air supply through the temperature-controlled compressed air system. The temperature-controlled compressed air system includes a pressure regulating valve, an insulated air pipe, a heat exchange device and a temperature sensor. The network device is connected to the gas source through an insulated gas pipe; along the direction from the gas source to the network device, the insulated gas pipe is equipped with a pressure regulating valve, a heat exchange device and a temperature sensor in sequence; The pressure regulating valve is used to pressurize the gas delivered by the gas source to obtain compressed air. The heat exchange device includes a water pipe and a water inlet valve. Hot water flows through the water pipe, and the heat exchange device exchanges heat with the compressed air passing through the heat exchange device through the hot water in the water pipe. The water inlet valve is installed on the hot water pipe and is used to control the flow of hot water entering the water pipe to adjust the temperature of the compressed air. The temperature controller is electrically connected to the temperature sensor and the water inlet valve. The temperature sensor is used to detect the temperature of the compressed air after heat exchange and send the detection result to the temperature controller. The temperature controller compares the detection result with the set temperature. When the two are not equal, the temperature controller controls the opening of the water inlet valve to adjust the temperature of the compressed air. The godet rollers in GR1 A zone and GR1 B zone share a motor. The diameter of the godet roller in GR1 A zone is equal to that of the GR2 godet roller. The diameter of the godet roller in GR1 B zone is 0.80-0.90 mm larger than that in GR1 A zone. The surface linear speed of the GR2 godet roller is 9.45-10.64 m / min higher than that in GR1 A zone. The lengths of the GR1 A zone godet, GR1 B zone godet, GR2 godet, and GR3 godet are all 80 mm; the distance between the center axis of the GR1 A zone godet and the center axis of the GR2 godet is 1.3 m, the distance between the center axis of the GR2 godet and the center axis of the GR1 B zone godet is 1.3 m, and the distance between the center axis of the GR1 B zone godet and the center axis of the GR3 godet is 1.5 m.

2. The method for preparing a coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn according to claim 1, characterized in that: The oil content of coarse denier trilobal special-shaped bright polyester pre-oriented yarn is 0.30~0.40wt%.

3. The method for preparing a thick denier trilobal special-shaped lustrous polyester pre-oriented yarn according to claim 1, characterized in that: The temperature sensor is arranged at the connection between the heat-insulating air pipe and the network device.

4. The method for preparing a thick denier trilobal special-shaped lustrous polyester pre-oriented yarn according to claim 1, characterized in that: The air pressure of the spinning pre-network is 0.18~0.22MPa, the air temperature of the winding pre-network is 25~30℃, and the air pressure of the winding pre-network is 0.08~0.1MPa.

5. The method for preparing a coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn according to any one of claims 1 to 4, characterized in that: The specifications of coarse denier three-leaf special-shaped bright polyester pre-oriented yarn are 545~1050dtex / 96~192f.

6. The method for preparing coarse denier trilobal special-shaped lustrous polyester pre-oriented yarn according to claim 5, characterized in that: The degradation rate of hair yarn and loose loop yarn of coarse denier trilobal special-shaped bright polyester pre-oriented yarn is ≤0.3%, the oiling efficiency is ≥98%, the oil content deviation is ≤0.03%, and the winding tension deviation rate is ≤5%.

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