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

Abstract

The invention belongs to the technical field of polyester fibers, and discloses a preparation method of a coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn, which comprises the following steps: extruding a polyester melt through a trilobal special-shaped section spinneret plate, cooling, oiling, spinning pre-interlacing, GR1A area, GR2, GR1B area, winding pre-interlacing, GR3 and winding in sequence to obtain the coarse-denier trilobal special-shaped lustrous polyester pre-oriented yarn. An oil spraying nozzle for oiling comprises an oil spraying hole and a yarn channel, and the longitudinal section of the yarn channel is a semi-closed circle in the direction perpendicular to the length direction of the yarn channel; the diameter of the godet in the GR1A area is equal to that of the godet in the GR2 area, the diameter of the godet in the GR1B area is larger than that of the godet in the GR1A area, and the surface linear speed of the godet in the GR2 area is larger than that of the godet in the GR1A area. According to the method, the permeability and the permeability uniformity of the oiling agent can be effectively improved, and the problem that the oiling agent is not uniform is avoided.

Description

Technical Field

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

[0002] In the preparation process of coarse denier three-leaf special-shaped bright polyester pre-oriented yarn, the oiling step is crucial. However, although the direct use of crude oil for oiling in this step can improve the post-processing yield, the crude oil itself has the characteristics of high viscosity, many impurities, and poor thermal stability, which will make it difficult for the crude oil to be evenly distributed on the fiber surface, resulting in uneven oiling. In addition, during the spinning process, the fiber needs to undergo high-temperature treatment. For example, when passing through a hot roller, some components in the crude oil may undergo chemical reactions at high temperatures, resulting in changes or instability in the fiber properties. This not only affects the physical properties of the fiber, but may also have an adverse effect on the dyeing properties and thermal stability of the fiber.

[0003] Therefore, the oiling scheme for the coarse denier three-lobed special-shaped bright polyester pre-oriented yarn in the prior art is usually to dilute the crude oil with deionized water in a specific ratio to a concentration of 9-10%, and then oil the yarn bundle through an oil pump and an oil nozzle. However, this method will result in a relatively high water content in the finished polyester pre-oriented yarn. In particular, the cross-section of the three-lobed special-shaped yarn contains three angles, which also makes it difficult for the yarn bundle to effectively remove the stored moisture when passing through ceramic components such as wire guide hooks, further exacerbating the moisture content problem of the coarse denier three-lobed special-shaped bright polyester pre-oriented yarn. In addition, the three-lobed special-shaped bright polyester pre-oriented yarn prepared in this way is prone to light measurement during long-term storage due to its long time and high temperature. In addition, due to excessive moisture, after passing through the post-processing high-temperature elastic hot box, the moisture volatilization will also lead to a low yield rate for subsequent customers.

[0004] In order to solve the above problems, the prior art attempts two solutions.

[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, and 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-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 running speed of the yarn bundle is as high as 3000-5000 m / min, and the lower cooling temperature and higher oil concentration will also affect the fluidity and permeability of the oiling agent, which is easy to cause uneven oiling. For example, the oiling concentration was increased in the literature (Improvement of Processing Quality of 55dtex / 72f Fine Denier Yarn after Full Dulling [J]. Polyester Industry. 2018, 31(1): 33-36), but the increase in the concentration of the oiling agent also affected the fluidity and permeability of the oiling agent, resulting in the problem of uneven oiling.

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

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

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

[0010] A method for preparing a thick denier three-lobed special-shaped shiny polyester pre-oriented yarn, wherein the polyester melt is extruded through a three-lobed 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 the thick denier three-lobed special-shaped shiny polyester pre-oriented yarn;

[0011] The oiling adopts crude oil (the effective components of crude oil are 90-93wt%, and the remaining 7-10wt% are some oil solvents, dispersants and antistatic agents and other substances), 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 is composed of two semicircles and two straight line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line segments are distributed in a V shape.

[0012] The oil splashing is not regular and controllable, especially for special-shaped cross-sections, which are affected by the degree of special shape and high oil content, the splashing problem is more serious. Figure 1As shown in the figure, the splashing oil will cause the total amount of oiling to decrease locally. Since the splashing is uncontrollable, the amount of oiling cannot be replenished again, resulting in a low local oiling rate on the tow, and thus uneven oiling. Although the present invention cannot completely avoid the problem of oil splashing, the special oil nozzle structure design can block the splashing oil and quickly flow it back into the silk channel and then back to the tow, thereby improving the oiling efficiency, and the subsequent pre-network oil homogenization can make the oil distribution uniform;

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

[0014] The spinning pre-network uses 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., installing a pre-network under the spinning oil nozzle), instead of 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 dropped yet, and at this time, the tow quickly enters the pre-network of heated compressed air, so that the heated compressed air is immediately sprayed through the pre-network to homogenize the oil on the tow before the oil temperature drops, 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, which 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 temperature of the compressed air, thereby affecting the oiling uniformity of the tow).

[0016] The tow first passes through GR1 A zone, then GR2, then GR1 B zone, then passes through pre-network, then passes through GR3, and finally reaches the winding machine. Compared with the process flow of the prior art "cooling → oiling → winding pre-network → GR1 → GR2 → winding", the tow's travel on the godet roller is greatly increased. The main purpose of increasing the travel is to increase the oil agent's penetration time between the monofilaments and improve the penetration rate.

[0017] The guide rollers of GR1 A zone and GR1 B zone share a motor, the diameter of the guide roller of GR1 A zone is equal to the diameter of the guide roller of GR2, the diameter of the guide roller of GR1 B zone is 0.80-0.90mm larger than that of the guide roller of GR1 A zone, and the surface linear speed of the GR2 guide roller is 9.45-10.64m / min larger than that of the guide roller of GR1 A zone. Since the guide rollers of GR1 A zone and GR1 B zone share a motor, the set rotation speed is consistent. By controlling the difference in diameters of the guide rollers at both ends of the guide rollers of GR1 A zone and GR1 B zone, the purpose of inconsistent linear speed of the yarn on the surface of the guide roller can be achieved; under the same rotation speed, by setting the diameter of the guide roller of GR1 B zone to be 0.80-0.90mm larger than that of the guide roller of GR1 A zone, the linear speed of the yarn on the surface of the guide roller differs by about 18.9-21.28m / min, and then by setting the surface linear speed of the GR2 guide roller to be larger than that of GR1 The speed of zone A is 9.45-10.64m / min, which is 9.45-10.64m / min smaller than that of zone B of GR1. In this way, the speed difference can ensure that the tension of zone GR1A→GR2 and zone GR2→GR1B is maintained at the level required by the process. This is mainly because the coarse denier trilobal shaped fiber has a large specific surface area, and the friction resistance with the air and the wire guide roller increases, which makes it easy for the tow to shake and wrap around the wire guide roller, resulting in the phenomenon of single filament breakage and hairy wires. By setting the speed difference, the tension of the tow is stabilized, which can reduce the shaking or wrapping of the coarse denier trilobal fiber on the wire guide roller, thereby reducing the number of hairy wires.

[0018] As the preferred technical solution:

[0019] The method for preparing the thick denier three-lobed special-shaped shiny polyester pre-oriented yarn as described above has an oil content of 0.30-0.40wt% in the thick denier three-lobed special-shaped shiny polyester pre-oriented yarn.

[0020] In the method for preparing a coarse denier three-leaf special-shaped bright polyester pre-oriented yarn as described above, 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 diameters of the semicircles are 3.8-4.2 mm; and the angle of the V-shape is 19-21°.

[0021] In the method for preparing a thick denier three-leaf special-shaped bright polyester pre-oriented yarn as described above, the network device used in the spinning pre-network is installed 45 to 55 cm below the oil nozzle. If the installation distance is less than 45 cm, it is easy to be disturbed by the cooling wind to reduce the temperature of the pre-network air pressure, affecting the fluidity and permeability of the oil in the fiber; and if the installation distance is greater than 55 cm, it is easy to be affected by the air pressure at the tunnel mouth, causing the fiber to shake and affecting the winding tension. At the same time, the network device obtains constant temperature air supply through the temperature-regulating compressed air system; the temperature-regulating 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, a pressure regulating valve, a heat exchange device and a temperature sensor are arranged on the insulated gas pipe in sequence;

[0023] The pressure regulating valve is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device includes a water pipe and a water inlet valve; hot water is passed 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 arranged on the hot water pipe, and the water inlet valve 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 temperature of the compressed air, 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 method for preparing a thick denier three-leaf special-shaped bright polyester pre-oriented yarn as described above, 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, in 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 0.18-0.22 MPa, the air temperature of the winding pre-network is 25-30°C, the air pressure of the winding pre-network is 0.08-0.1 MPa, the network devices used for the spinning pre-network and the winding pre-network are the same, the nozzle aperture is 1.3 mm, and the nozzle is used to eject airflow to pre-network the filament bundle.

[0027] According to the method for preparing a coarse denier three-leaf special-shaped bright polyester pre-oriented yarn as described above, the lengths of the GR1 A zone guide roller, the GR1 B zone guide roller, the GR2 guide roller, and the GR3 guide roller are all 80 mm; the distance between the central axis of the GR1 A zone guide roller and the central axis of the GR2 guide roller is 1.3 m, the distance between the central axis of the GR2 guide roller and the central axis of the GR1 B zone guide roller is 1.3 m, and the distance between the central axis of the GR1 B zone guide roller and the central axis of the GR3 guide roller is 1.5 m. In this way, the total stroke of the yarn bundle between the guide discs is about 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 stroke of the yarn bundle between the two guide discs is about 1.5 m. Compared with the prior art, the present invention increases the stroke 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-network in front of the GR3 wire guide roller can make the tow pass through the second pre-network for oil penetration and homogenization again. The coarse denier trilobal shaped fiber has a large surface area, which increases the friction of the tow passing through the wire guide porcelain, resulting in problems such as loose loops and hairy threads. By increasing the total stroke of the tow between the wire guide discs and adding a second pre-network, the permeability of the oil can be improved, the oil film strength on the fiber surface and the cohesion between the monofilaments can be increased, thereby reducing the number of hairy threads and loose loops.

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

[0029] The method for preparing a coarse denier three-lobed special-shaped shiny polyester pre-oriented yarn as described above has a hair and loose loop yarn degradation rate of ≤0.3%, an oiling efficiency of ≥98%, an oil content deviation of ≤0.03%, and a winding tension deviation rate of ≤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 subsequent pre-network oil agent homogenization can make the oil agent evenly distributed, 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 single filaments, thereby 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 of the oil agent 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 is a schematic diagram of a semi-enclosed fuel injection nozzle of the present invention;

[0037] Figure 3 It is a schematic diagram of the temperature regulating compressed air system of the present invention;

[0038] Figure 4 It is a schematic diagram of the travel of the tow from GR1 A zone 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 control meter, 6-temperature sensor, 7-network device, 8-GR1 A area, 9-GR1 B area, 10-GR2, 11-GR3. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it 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 within the scope limited by the appended claims of the application equally.

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

[0042] Downgrading rate of hairy yarn and loose loop yarn: Calculation formula: Downgrading rate of hairy yarn and loose loop yarn = (number of downgraded hairy yarn + number of downgraded loose loop yarn) / total number × 100%, where hairy yarn refers to the yarn bundle with fuzzy phenomenon or the broken ends of single yarn protruding from the surface of multi-filament yarn. When one or more hairy yarns appear, downgrading is carried out and the number of downgraded hairy yarns is recorded; loose loop yarn refers to the single yarn exposed from the end face of the package in arc or loop shape and without broken yarn. If two loose loop yarns appear, downgrading is carried out and the number of downgraded loose loop yarns is recorded.

[0043] Oiling efficiency: 2 g of the coarse denier three-leaf special-shaped bright polyester pre-oriented yarn prepared in each embodiment was taken as a sample, and then the measured oil content of the sample was tested by MQC23-10 nuclear magnetic resonance oil content analyzer according to the nuclear magnetic resonance method in GB / T 6504-2017 "Test method for oil content of chemical fibers" standard, and then the measured oil content was 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 specific gravity of the oil) to obtain the oiling efficiency. The calculation formula of the oiling efficiency is: oiling efficiency = measured oil content × 100% / theoretical oil content.

[0044] Oil content deviation: Take the coarse denier three-leaf special-shaped bright polyester pre-oriented yarn prepared in each embodiment as a sample and test the oil content, and then calculate the oil content deviation. The calculation formula of 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 three-lobed special-shaped shiny polyester pre-oriented yarn in each embodiment, a TENSIONSTAR TS205P400 tension meter is used to test the actual measured winding tension. The specific process is: first start the tension meter, and when the screen displays a number of 0.00, the tension meter clamps the coarse denier three-lobed special-shaped shiny polyester pre-oriented yarn onto the pressure sensing rod, and then read the tension value. The winding tension deviation rate is calculated based on the measured winding tension, and the calculation formula is: 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 three-leaf special-shaped bright polyester pre-oriented yarn, the steps are as follows:

[0048] The polyester melt (formed 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 three-leaf profiled cross-section spinneret, and then successively cooled, oiled, spun pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier three-leaf profiled bright polyester pre-oriented yarn (the yarn bundle travels from GR1 A zone to GR3 as shown in FIG. 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 0.03cc / r, the oil pump speed is 19.7rpm, the pump supply of the metering pump is 158.05g / min, the set oil content center value is 0.30%, and the winding tension center value (M) is 65cN;

[0049] The oiling is carried out by using crude oil (polyester FDY oil, the manufacturer is Tongxiang Henglong Chemical Co., Ltd., the brand is TK-1009TM, the measured oil concentration is 90%), and the oiling method is oiling by oil spray nozzle;

[0050] like Figure 2 As shown, the fuel injection nozzle includes a fuel injection hole and a wire channel, and 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 line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line 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 oil 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 is passed through the water pipe 3, and the heat exchange device 2 performs heat exchange 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 arranged on the water pipe 3, and the water inlet valve 4 is used to control the flow rate of hot water entering the water pipe 3 to adjust the temperature of the compressed air;

[0058] The temperature sensor 6 is arranged 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 the 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 wire guide roller in the GR1 A zone and the wire guide roller in the GR1 B zone share a motor. The diameter of the wire guide roller in the GR1 A zone is equal to that of the wire guide roller in the GR2 zone. The diameter of the wire guide roller in the GR1 B zone is 0.8 mm larger than that of the wire guide roller in the GR1 A zone. The surface linear speed of the wire guide roller in the GR2 zone is 9.45 m / min larger than that of the wire guide roller in the GR1 A zone.

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

[0062] The final coarse denier three-leaf special-shaped bright polyester pre-oriented yarn has a specification of 545dtex / 96f, an oil content of 0.3wt%, a degradation rate of hair 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 three-leaf special-shaped bright polyester pre-oriented yarn, the steps are as follows:

[0065] A polyester melt (formed by polycondensation of PTA and EG, with a mass proportion of PTA of 70.3%) with an intrinsic viscosity of 0.615 dL / g after being metered by a metering pump is extruded through a three-leaf special-section spinneret, and then sequentially cooled, oiled, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier three-leaf 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 0.03cc / r, the oil pump speed is 23.1rpm, the pump supply of the metering pump is 169.94g / min, the oil content center value is set to 0.32%, and the winding tension center value is 68cN;

[0066] The oiling is carried out by using crude oil (polyester FDY oil, the manufacturer is Tongxiang Henglong Chemical Co., Ltd., the brand is TK-1009TM, the actual oil concentration is 91%), and the oiling method is oiling by 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 line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line 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 oil 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 air 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, a pressure regulating valve, a heat exchange device and a temperature sensor are arranged on the insulated gas pipe in sequence;

[0074] The pressure regulating valve is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device includes a water pipe and a water inlet valve; hot water is passed 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 arranged on the hot water pipe, and the water inlet valve 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-insulating air pipe and the network device;

[0076] 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.

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

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

[0079] The final coarse denier three-leaf 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 loop 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 three-leaf special-shaped bright polyester pre-oriented yarn, the steps are as follows:

[0082] A polyester melt (formed by polycondensation of PTA and EG, with a mass proportion of PTA of 70.5%) with an intrinsic viscosity of 0.618 dL / g after being metered by a metering pump is extruded through a three-leaf special-section spinneret, and then cooled, oiled, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding are sequentially performed to obtain a coarse denier three-leaf 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 0.05cc / r, the oil pump speed is 22.0rpm, the pump supply of the metering pump is 225.13g / min, the oil content center value is set to 0.38%, and the winding tension center value is 70cN;

[0083] The oiling is carried out by using crude oil (polyester FDY oil, the manufacturer is Tongxiang Henglong Chemical Co., Ltd., the brand is TK-1009TM, the actual oil concentration is 92%), and the oiling method is oiling by 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 line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line segments are distributed in a V shape.

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

[0087] The network device used in the spinning pre-network was installed 55 cm below the oil 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 air 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, a pressure regulating valve, a heat exchange device and a temperature sensor are arranged on the insulated gas pipe in sequence;

[0091] The pressure regulating valve is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device includes a water pipe and a water inlet valve; hot water is passed 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 arranged on the hot water pipe, and the water inlet valve 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-insulating air pipe and the network device;

[0093] 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.

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

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

[0096] The final coarse denier three-leaf 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 loop 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 three-leaf special-shaped bright polyester pre-oriented yarn, the steps are as follows:

[0099] A polyester melt (formed by polycondensation of PTA and EG, with a mass proportion of PTA of 70.8%) with an intrinsic viscosity of 0.621 dL / g after being metered by a metering pump is extruded through a three-leaf profiled cross-section spinneret, and then sequentially cooled, oiled, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier three-leaf profiled 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 0.05cc / r, the oil pump speed is 24.6rpm, the pump supply of the metering pump is 290.47g / min, the oil content center value is set to 0.36%, and the winding tension center value is 85cN;

[0100] The oiling is carried out by using crude oil (polyester FDY oil, the manufacturer is Tongxiang Henglong Chemical Co., Ltd., the brand is TK-1009TM, the actual oil concentration is 93%), and the oiling method is oiling by 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 line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line segments are distributed in a V shape.

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

[0104] The network device used in the spinning pre-network was installed 48 cm below the oil 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 air 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, a pressure regulating valve, a heat exchange device and a temperature sensor are arranged on the insulated gas pipe in sequence;

[0108] The pressure regulating valve is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device includes a water pipe and a water inlet valve; hot water is passed 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 arranged on the hot water pipe, and the water inlet valve 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-insulating air pipe and the network device;

[0110] 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.

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

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

[0113] The final coarse denier three-leaf 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 loop 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 three-leaf special-shaped bright polyester pre-oriented yarn, the steps are as follows:

[0116] A polyester melt (formed by polycondensation of PTA and EG, with PTA accounting for 71% by mass) with a characteristic viscosity of 0.625 dL / g after being metered by a metering pump is extruded through a three-leaf special-section spinneret, and then cooled, oiled, spinning pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding are sequentially performed to obtain a coarse denier three-leaf 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 0.05cc / r, the oil pump speed is 27.4rpm, the pump supply of the metering pump is 320.25g / min, the oil content center value is set to 0.36%, and the winding tension center value is 90cN;

[0117] The oiling is carried out by using crude oil (polyester FDY oil, the manufacturer is Tongxiang Henglong Chemical Co., Ltd., the brand is TK-1009TM, the actual oil concentration is 92%), and the oiling method is oiling by 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 line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line 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 oil 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 air 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, a pressure regulating valve, a heat exchange device and a temperature sensor are arranged on the insulated gas pipe in sequence;

[0125] The pressure regulating valve is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device includes a water pipe and a water inlet valve; hot water is passed 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 arranged on the hot water pipe, and the water inlet valve 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-insulating air pipe and the network device;

[0127] 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.

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

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

[0130] The final coarse denier three-leaf 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 loop 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 three-leaf special-shaped bright polyester pre-oriented yarn, characterized in that: After the polyester melt is extruded through a three-leaf special-shaped cross-section spinneret, it is sequentially cooled, oiled, spun pre-network, GR1 A zone, GR2, GR1 B zone, winding pre-network, GR3 and winding to obtain a coarse denier three-leaf special-shaped bright polyester pre-oriented yarn; The oiling adopts crude oil 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 is composed of two semicircles and two straight line segments. The two straight line segments are respectively connected to one end of each of the two semicircles, and the other end of each of the two semicircles is connected to the orifice of the oil injection hole. The two straight line segments are distributed in a V shape. The oiling temperature is 57-60℃; The spinning pre-network uses constant temperature air supply, and the air temperature is equal to the oiling temperature; The guide rollers of GR1 A zone and GR1 B zone share a motor. The diameter of the guide roller of GR1 A zone is equal to that of GR2 guide roller. The diameter of the guide roller of GR1 B zone is 0.80-0.90 mm larger than that of GR1 A zone. The surface linear speed of GR2 guide roller is 9.45-10.64 m / min larger than that of GR1 A zone.

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

3. The method for preparing a thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to claim 1, characterized in that: The injection hole is circular, with a hole diameter of 0.4 to 0.6 mm; the diameters of the two semicircles are equal, with a semicircle diameter of 3.8 to 4.2 mm; and the V-shaped angle is 19 to 21 degrees.

4. The method for preparing a thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to claim 1, characterized in that: The network device used in the spinning pre-network is installed 45 to 55 cm below the nozzle, and 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, a pressure regulating valve, a heat exchange device and a temperature sensor are arranged on the insulated gas pipe in sequence; The pressure regulating valve is used to pressurize the gas transported by the gas source to obtain compressed air; the heat exchange device includes a water pipe and a water inlet valve; hot water is passed 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 arranged on the hot water pipe, and the water inlet valve 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 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.

5. The method for preparing thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to claim 4, characterized in that: The temperature sensor is arranged at the connection between the heat-insulating air pipe and the network device.

6. The method for preparing a thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to claim 1, characterized in that: The air pressure of the spinning pre-network is 0.18-0.22 MPa, the air temperature of the winding pre-network is 25-30°C, and the air pressure of the winding pre-network is 0.08-0.1 MPa.

7. The method for preparing thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to claim 1, characterized in that: The lengths of the GR1 A zone guide roller, GR1 B zone guide roller, GR2 guide roller and GR3 guide roller are all 80 mm; the distance between the central axis of the GR1 A zone guide roller and the central axis of the GR2 guide roller is 1.3 m, the distance between the central axis of the GR2 guide roller and the central axis of the GR1 B zone guide roller is 1.3 m, and the distance between the central axis of the GR1 B zone guide roller and the central axis of the GR3 guide roller is 1.5 m.

8. The method for preparing thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to any one of claims 1 to 7, characterized in that: The specifications of coarse denier three-leaf special-shaped bright polyester pre-oriented yarn are 545~1050dtex / 96~192f.

9. The method for preparing thick denier three-leaf special-shaped bright polyester pre-oriented yarn according to claim 8, characterized in that: The degradation rate of hair and loose loop yarns of coarse denier three-leaf 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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