Multi-roll oiling device and use thereof

Abstract

The application belongs to the technical field of chemical fiber and textile, and discloses a multi-roller oiling device and application thereof. The multi-roller oiling device comprises an oil nozzle, an oiling pump, a first oil roller, a second oil roller and a skin pressing roller which are located in the wire passing channel of the oil nozzle. The second oil roller is located below the first oil roller, the rightmost sides of the two are located on the same vertical plane and are located on the right side of the left side wall, and the rotating directions of the two are the same. The skin pressing roller is located on the right side of the second oil roller, a gap is left between the two, and the rotating directions of the two are opposite. The left side wall of the oil nozzle is provided with an oil inlet and an oil outlet, the upper surface of the protruding part of the oil nozzle is provided with a C-shaped groove connected with the oil outlet, and the first oil roller is embedded in the C-shaped groove. The cross section of the first oil roller is composed of a center circle and a plurality of C-shaped lines. The preparation method of the profiled fiber is as follows: polyester melt extrusion, cooling and forming, oiling and winding and forming. The quality and efficiency of the preparation of the profiled fiber are improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical fiber textile technology and relates to a multi-roller oiling device and its application. Background Technology

[0002] In the process of preparing profiled fibers, the oiling process is a crucial step in ensuring fiber quality. Its purpose is to ensure that the filaments are evenly and fully oiled to meet the requirements of subsequent processing. Currently, to achieve the goal of even and sufficient oiling of the filaments, the traditional bonding method is widely used, which requires that an enveloping angle and a deflection angle be formed between the filaments and the oil nozzle outlet, with the angle generally maintained at 3°-5°.

[0003] However, traditional lamination methods have several drawbacks. First, the large contact area and long friction distance between the yarn and the oil nozzle exacerbate friction at high speeds, leading to significant heat accumulation. The yarn's instantaneous temperature can easily reach its glass transition temperature, causing frequent yarn breakage and molten particles clogging the oil outlet, resulting in reduced or uneven oil output. Second, the high friction between the yarn and the oil nozzle significantly increases spinning tension, leading to a rise in the tension CV value and frequent yarn breakage during subsequent spinning. Furthermore, sublimation products adhering to the oil cause yarn vibration, severely compromising oiling uniformity.

[0004] These problems severely limit the quality and production efficiency of profiled fiber preparation, and there is an urgent need to improve existing equipment. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and to provide a multi-roller oiling device and its application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A multi-roller oiling device includes an oil nozzle and an oil pump. The oil nozzle has a U-shaped structure and is composed of a front side wall, a left side wall, and a rear side wall connected in sequence. The left side wall is provided with an oil inlet and an oil outlet. It also includes a first oil roller, a second oil roller, and a pressure roller located in the yarn feeding channel of the oil nozzle.

[0008] The first oil roller, the second oil roller, and the pressure roller are all parallel to the front-to-back direction and are each driven by a drive device to rotate around their own central axis. The second oil roller is located below the first oil roller, and the rightmost sides of both are on the same vertical plane (i.e., the second oil roller is directly below the first oil roller, and the two have no included angle) and are located on the right side of the left side wall. The two rotate in the same direction. When the filament runs in the oil nozzle, it contacts the rightmost sides of the first and second oil rollers and does not contact the left side wall. Therefore, the friction force on the filament is much lower than that of the prior art.

[0009] The pressure roller is located to the right of the second oil roller, with a gap between them. The two rollers rotate in opposite directions. The pressure roller can forcefully spread the filaments at the second oil roller, causing the monofilaments at the first oil roller to spread out, so as to achieve full and even distribution of oil to each monofilament, while preventing the filaments from jumping and causing insufficient oiling. The part of the left side wall below the oil outlet protrudes to the right relative to the oil outlet. The upper surface of the protruding part is provided with a C-shaped groove that connects to the oil outlet. The opening of the C-shaped groove faces upward and the groove direction is parallel to the front and back direction.

[0010] The first oil roller is located on the right side of the oil outlet and is embedded in the C-shaped groove. The cross-section of the first oil roller consists of a central circle and multiple C-shaped lines. One end of each C-shaped line is connected to the central circle, and the other end is away from the central circle. All C-shaped lines are evenly distributed around the central circumference of the central circle. This design of the first oil roller is conducive to storing the oil and allowing it to penetrate evenly into the yarn.

[0011] As a preferred technical solution:

[0012] As described above, in a multi-roller oiling device, the C-shaped line is an arc with a central angle of 110-120° and a radius of 4-5mm. The straight line containing the two endpoints of the C-shaped line passes through the center of the central circle. The radius of the central circle is 5-6mm, and the number of C-shaped lines is 18-20. The end of the C-shaped line away from the central circle is smoothly connected to the main body of the C-shaped line, thus avoiding damage to the yarn by the first oiling roller.

[0013] The multi-roller oiling device described above further includes a first oil baffle and a second oil baffle; the first oil baffle and the second oil baffle respectively block both ends of the first oil roller.

[0014] As described above, in a multi-roller oiling device, both the second oil roller and the pressure roller are round rollers with a radius of 10-12mm. The surface of the second oil roller is ceramic, and the surface of the pressure roller is PU. The PU material provides good friction to the filaments without damaging them.

[0015] In the multi-roller oiling device described above, the distance between the second oil roller and the first oil roller is 30-40mm.

[0016] The multi-roller oiling device described above also includes a jacket; the jacket surrounds the outer wall of the oil nozzle, and the two form a closed space. The jacket is provided with an air inlet and an air outlet; the oil nozzle is made of ceramic, and the jacket is made of stainless steel; when 0.5-0.6MPa compressed air is introduced from the air inlet and discharged from the air outlet, it can carry away the heat generated by the friction between the filament and the yarn path, and maintain the surface temperature of the oil nozzle at 30-33℃. This can prevent the heat accumulation from causing the monofilament to melt instantaneously.

[0017] As described in any of the preceding claims, the oil pump includes n quick-connect oil pumps, where n ≥ 1;

[0018] There are n nozzles in total;

[0019] The multi-roller oiling device also includes a one-way conversion device, an air supply device, a three-way check valve, an oil supply pipe, and a fourth air pipe;

[0020] The one-way conversion device consists of a coaxial cylindrical tube and a frustum. One end of the cylindrical tube is sealed to the small end of the frustum, and the other end is the air inlet. The large end of the frustum is sealed. There are n air outlets evenly distributed around the central axis of the frustum on the side wall near the large end.

[0021] The air inlet is connected to the air delivery device;

[0022] Each air outlet is connected to the threaded end of a three-way check valve. One end of each three-way check valve is connected to an upper oil pipe, and the other end of each three-way check valve is connected to a fourth air pipe. All upper oil pipes are connected to the oil inlet of different oil nozzles, and all fourth air pipes are connected to different oil pump quick-connect fittings.

[0023] As described above, the multi-roller oiling device includes an air supply device comprising a cylinder, a first air pipe, a second air pipe, a main air inlet pipe, a three-position four-way valve, a third air pipe, and an air source.

[0024] The cylinder barrel has two air outlets, which are located near the two ends of the cylinder barrel. The two air outlets are connected to one end of the first air pipe and the second air pipe, respectively. The other ends of the first air pipe and the second air pipe, as well as one end of the main intake pipe, are connected to the three intake ends of the three-position four-way valve, respectively. The other end of the main intake pipe is connected to the air source. The air outlet of the three-position four-way valve is connected to one end of the third air pipe, and the other end of the third air pipe is connected to the intake end.

[0025] The present invention also provides an apparatus for preparing irregularly shaped fibers, comprising a multi-roller oiling device, a spinneret and a bellows as described in any of the preceding claims, wherein the bellows is located above a cylinder and is fixedly connected to the piston rod of the cylinder.

[0026] Each time the bellows completes one lifting and lowering motion, the residual air generated in the cylinder flows from one intake end into the one-way conversion device, and then exits through n outlet ends, respectively flowing into n upper oil pipes and n oil nozzles, achieving two purging cycles for the n oil circuits. This fully utilizes the residual pressure of the cylinder exhaust to effectively purge the upper oil pipes, not only offering significant energy-saving advantages but also effectively solving the problem of uneven oil distribution caused by oil circuit blockage by impurities. The specific process is as follows:

[0027] When the bellows descends, the gas discharged from the second air pipe enters the three-position four-way valve, flows through the three-position four-way valve to the third air pipe, and then enters the air inlet of the one-way switching device from the third air pipe. Subsequently, it is discharged from n outlets, enters n upper oil pipes, and finally reaches n oil nozzles. To prevent compressed air from entering the upper oil pump, a three-way check valve is installed at the air outlet. Utilizing the characteristic that the compressed air pressure is higher than the oil pressure, the upper oil end of the three-way check valve is closed, ensuring that compressed air can only enter the upper oil pipe and cannot enter the fourth air pipe.

[0028] When the bellows rises, the gas discharged from the first air pipe passes through the three-position four-way valve and the third air pipe in sequence, and enters the air inlet of the one-way conversion device. Similarly, it is discharged from the n air outlets, enters the n upper oil pipes, and finally enters the n oil nozzles. The same applies to the descent stage. The three-way check valve prevents compressed air from entering the upper oil pump.

[0029] When the bellows is lowered to its lowest point or raised to its highest point, no more residual air is discharged from the second and first air pipes, and the device stops purging. At this time, the oil pressure is greater than the compressed air pressure (compressed air pressure is 0), the compressed air end of the three-way check valve closes, and the oil can smoothly enter the n upper oil pipes and finally be delivered to the n oil nozzles.

[0030] This invention also provides a method for preparing profiled fibers, using an apparatus for preparing profiled fibers as described in any of the preceding claims. The diameter of the filament is 0.1-0.15 mm smaller than the gap between the pressure roller and the second oil roller. This avoids the problem of excessive gripping force caused by excessively small gaps, which could damage the filament or cause uneven tension. Conversely, it avoids the problem of insufficient pressure on the filament due to excessively large gaps, which could lead to poor or uneven oiling. During oiling, the surface linear velocity of the first oil roller is 94%-96% of the filament stretching speed. If the speed of the first oil roller is high... Regarding the filament stretching speed, the first oil roller acts on the filament relatively quickly. Under the action of the oil, the friction of the filament decreases, making it easy to slip and wobble in the oil nozzle filament path, resulting in uneven filament tension. If the surface linear velocity of the first oil roller is too low, the filament will not be oiled in time or sufficiently, its smoothness and bundle properties will deteriorate, and it will be easy to produce fuzz, which will also lead to uneven tension. The surface linear velocity of the second oil roller is 89%-91% of the surface linear velocity of the first oil roller. The speed difference between the two creates overfeeding when oiling the filament, allowing the oil to fully penetrate into the inner layer of filament. The surface linear velocity of the pressure roller is the same as that of the second oil roller, and the values ​​of the covering angle α and the filament path angle deflection angle β are both in the range of 3°-5°.

[0031] As a preferred technical solution:

[0032] As described above, in the method for preparing irregularly shaped fibers, there are two types of spinnerets on the spinneret: C-type spinnerets and triangular spinnerets.

[0033] The outlet shape of the C-type spinneret is an arc, with a central angle of 90-93° and a diameter of 0.35-0.5 mm corresponding to the arc.

[0034] The outlet shape of the triangular spinneret is an equilateral triangle with a side length of 0.1-0.15 mm.

[0035] All C-type spinnerets are arranged in concentric circles around the center of the spinneret, with the C-type spinnerets on adjacent circles being staggered, and the opening of the C-type spinneret outlet shape is away from the center of the spinneret.

[0036] The number of C-shaped and triangular spinnerets is the same, and they correspond one-to-one. The triangular spinnerets are located inside the corresponding C-shaped spinnerets, and the centers of their outlet shapes coincide. One vertex of the outlet shape of the triangular spinneret is directly opposite the opening of the outlet shape of the C-shaped spinneret. During the cooling process, this special structure allows the cooling air to pass smoothly through the opening of the C-shaped spinneret and directly reach the triangular monofilament for cooling. Since the vertex of the triangular monofilament faces the direction of the cooling airflow, the resistance of the cooling airflow is effectively reduced, thereby achieving a more thorough and uniform cooling effect.

[0037] The overall process flow is as follows: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0038] The process parameters include: extrusion temperature 295-296℃, cooling air temperature 21-23℃, cooling air relative humidity 85-87%, cooling air pressure 18-21Pa, oil content 0.39-0.42%, and winding speed 2750-2850m / min.

[0039] The specifications of the shaped fibers are 15-33 dtex / 12-24f, the tension CV value is 1.1-1.3%, and the full roll rate is 99.1-99.4%.

[0040] Beneficial effects:

[0041] (1) By designing the oil nozzle, the present invention ensures that when the filament runs in the oil nozzle, it only contacts the first oil roller and the second oil roller and does not rub against the side wall. The friction of the filament is significantly lower than that of the prior art, reducing the risk of filament damage. The pressure roller can force the filament to spread out, so that the oil can be fully and evenly distributed to each filament, while preventing the filament from jumping and causing insufficient oiling. The cross-section of the first oil roller adopts a central circle and C-shaped line structure, which is conducive to storing the oil and evenly penetrating the filament, enhancing the oiling effect and improving the smoothness and bundle properties of the filament.

[0042] (2) The surface of the second oil roller of the present invention is made of ceramic, and the surface of the leather pressure roller is made of PU. The combination of the two ensures the oiling effect and avoids damage to the filaments, thereby improving the stability of fiber quality.

[0043] (3) The oil nozzle of the present invention is wrapped with a stainless steel jacket. 0.5-0.6MPa compressed air is introduced to remove frictional heat in time, keep the surface temperature of the oil nozzle at 30-33℃, eliminate the risk of instantaneous melting of monofilament, and ensure the stability of the production process.

[0044] (4) The present invention avoids filament slippage or insufficient oiling by precisely controlling the linear speed of the roller body; at the same time, the speed deviation between the surface of the second oil roller and the first oil roller produces an overfeed effect, which allows the oil to fully penetrate into the inner layer of filament, further improving the smoothness and bundle properties of the filament.

[0045] (5) The innovative design of this invention utilizes the residual pressure of cylinder exhaust to achieve two-stage purging of the oil circuit, which not only has significant energy-saving advantages, but also effectively solves the problem of uneven oil supply caused by impurities in the oil circuit.

[0046] (6) The present invention uses a design that corresponds C-type spinneret holes and triangular spinneret holes to allow cooling air to reach the triangular monofilament directly, reducing resistance and achieving a more thorough and uniform cooling effect, thereby improving the quality of fiber forming. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the spinneret structure in this invention;

[0048] Figure 2 This is a schematic diagram of the nozzle structure in this invention;

[0049] Figure 3 This is a cross-sectional view of the nozzle and a schematic diagram of the guide hook structure in this invention;

[0050] Figure 4 This is a schematic diagram of the first oil roller structure in the present invention. In the figure, (a) is a perspective view and (b) is a radial cross-sectional view.

[0051] Figure 5 This is a schematic diagram of the unidirectional conversion device in the present invention;

[0052] Figure 6 This is a partial structural diagram of the apparatus for preparing irregularly shaped fibers in this invention;

[0053] Among them, 5-oil nozzle, 5.2-jacket, 5.3-first oil roller, 5.31-first oil baffle, 5.32-second oil baffle, 5.34-center circle, 5.35-C-shaped line, 5.4-second oil roller, 5.5-air inlet, 5.6-air outlet, 5.7-upper oil pipe, 5.8-upper oil pump, 5.81-oil pump quick insert, 5.9-skin pressure roller, 5.10-one-way conversion device, 5.11-air inlet end, 5.12-air outlet end, 5.13-oil outlet, 5.14-C-shaped groove, 7-wind box, 8-cylinder, 8.1-first air pipe, 8.2-second air pipe, 8.3-three-position four-way valve, 8.4-main air inlet pipe, 8.5-third air pipe, 8.6-fourth air pipe, 8.7-air source. Detailed Implementation

[0054] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0055] The detection methods for relevant indicators in the examples and comparative examples:

[0056] Tension CV value: During the fiber stretching and winding process, a handheld tension meter of model ETPB-100 is used to test and record the tension of each multifilament at a distance of 1 meter from the guide hook. The data is then entered into the computer and the system automatically calculates the tension CV value.

[0057] Full roll rate: Calculated according to the formula Full roll rate = (Number of qualified full rolls / Total number of rolls) × 100%, where qualified full rolls are the silk rolls that have reached the specified roll weight.

[0058] The apparatus used to prepare irregularly shaped fibers in the following examples, such as Figures 1-6 As shown, it includes a wind box 7, a spinneret, an oil pump 5.8, a one-way conversion device 5.10, an air supply device, an oil nozzle 5, a jacket 5.2, a first oil roller 5.3, a second oil roller 5.4, a pressure roller 5.9, a first oil baffle 5.31, and a second oil baffle 5.32 located in the yarn feeding channel of the oil nozzle 5.

[0059] like Figure 1 As shown, there are two types of spinneret holes on the spinneret: C-type spinneret holes and triangular spinneret holes.

[0060] The outlet shape of the C-type spinneret is an arc, with a central angle of 90-93° and a diameter of 0.35-0.5 mm corresponding to the arc.

[0061] The outlet shape of the triangular spinneret is an equilateral triangle with a side length of 0.1-0.15 mm.

[0062] All C-type spinnerets are arranged in concentric circles around the center of the spinneret, with the C-type spinnerets on adjacent circles being staggered, and the opening of the C-type spinneret outlet shape is away from the center of the spinneret.

[0063] The number of C-type spinnerets and triangular spinnerets is the same, and they correspond one-to-one. The triangular spinnerets are located inside the corresponding C-type spinnerets, and the centers of their outlet shapes coincide. One vertex of the outlet shape of the triangular spinneret is directly opposite the opening of the outlet shape of the C-type spinneret.

[0064] The quantity of nozzle 5 is n, where n≥1; for example Figure 2 As shown, each nozzle 5 is a U-shaped structure, consisting of a front side wall, a left side wall, and a rear side wall connected in sequence. The left side wall is provided with an oil inlet and an oil outlet 5.13.

[0065] like Figure 2 As shown, the first oil roller 5.3, the second oil roller 5.4, and the pressure roller 5.9 are all parallel to the front-to-back direction and are each driven by a drive device to rotate around its own central axis; as Figure 3 As shown, the second oil roller 5.4 is located below the first oil roller 5.3, and the rightmost sides of both are on the same vertical plane and on the right side of the left side wall. The two rotate in the same direction. The distance between the second oil roller 5.4 and the first oil roller 5.3 is 30-40mm. The pressure roller 5.9 is located to the right of the second oil roller 5.4, with a gap between them. The two rotate in opposite directions.

[0066] like Figure 3 As shown, the part of the left side wall located below the oil outlet 5.13 protrudes to the right relative to the oil outlet 5.13. The upper surface of the protruding part is provided with a C-shaped groove 5.14 that connects to the oil outlet 5.13. The groove opening of the C-shaped groove 5.14 faces upward and the groove opening direction is parallel to the front and back direction.

[0067] like Figure 4 As shown, the cross-section of the first oil roller 5.3 consists of a central circle 5.34 and multiple C-shaped lines 5.35. One end of each C-shaped line 5.35 is connected to the central circle 5.34, while the other end is away from the central circle 5.34. All C-shaped lines 5.35 are evenly distributed around the central circumference of the central circle 5.34. Each C-shaped line 5.35 is an arc with a central angle of 110-120° and a radius of 4-5 mm. The straight lines containing the two endpoints of the C-shaped lines 5.35 pass through the center of the central circle 5.34. The radius of the central circle 5.34 is 5-6 mm, and there are 18-20 C-shaped lines 5.35. The end of each C-shaped line 5.35 away from the central circle 5.34 is smoothly connected to the main body of the C-shaped line 5.35.

[0068] like Figure 3 As shown, the first oil roller 5.3 is located to the right of the oil outlet 5.13 and is embedded in the C-shaped groove 5.14; the first oil baffle 5.31 and the second oil baffle 5.32 respectively block the two ends of the first oil roller 5.3;

[0069] Both the second oil roller 5.4 and the leather pressure roller 5.9 are round rollers with a radius of 10-12mm; the surface of the second oil roller 5.4 is ceramic, and the surface of the leather pressure roller 5.9 is PU.

[0070] like Figure 2 As shown, the jacket 5.2 wraps around the outer wall of the nozzle 5, and the two form a closed space. The jacket 5.2 is provided with an air inlet 5.5 and an air outlet 5.6.

[0071] like Figure 6 As shown, the upper oil pump 5.8 includes n oil pump quick connectors 5.81;

[0072] like Figure 5 As shown, the one-way conversion device 5.10 consists of a coaxial cylindrical tube and a frustum. One end of the cylindrical tube is sealed to the small end of the frustum, and the other end is the air inlet 5.11. The large end of the frustum is sealed, and n air outlets 5.12 are evenly distributed around the central axis of the frustum on the side wall of the frustum near the large end.

[0073] Each air outlet 5.12 is connected to the threaded end of a three-way check valve. One end of each three-way check valve is connected to an upper oil pipe 5.7. The other end of each three-way check valve is connected to a fourth air pipe 8.6. All the upper oil pipes 5.7 are connected to the oil inlet of different oil nozzles 5. All the fourth air pipes 8.6 are connected to different oil pump quick connectors 5.81.

[0074] like Figure 6 As shown, the air supply device includes a cylinder 8, a first air pipe 8.1, a second air pipe 8.2, a main air inlet pipe 8.4, a three-position four-way valve 8.3, a third air pipe 8.5, and an air source 8.7;

[0075] The cylinder 8 has two air outlets on its cylinder barrel, which are located near the two ends of the cylinder barrel. The two air outlets are connected to one end of the first air pipe 8.1 and the second air pipe 8.2, respectively. The other ends of the first air pipe 8.1 and the second air pipe 8.2, as well as one end of the main air intake pipe 8.4, are connected to the three air intake ends of the three-position four-way valve 8.3, respectively. The other end of the main air intake pipe 8.4 is connected to the air source 8.7. The air outlet of the three-position four-way valve 8.3 is connected to one end of the third air pipe 8.5, and the other end of the third air pipe 8.5 is connected to the air intake end 5.11.

[0076] like Figure 6As shown, the bellows 7 is located above the cylinder 8 and is fixedly connected to the piston rod of the cylinder 8.

[0077] The polyester melt used in the following examples and comparative examples is PET polyester melt with an intrinsic viscosity of 0.660 dl / g, a terminal carboxyl group content of 25 mol / t, and a diethylene glycol content of 1.0 wt%.

[0078] Example 1

[0079] A method for preparing profiled fibers, using the above-mentioned apparatus for preparing profiled fibers, the overall process flow is: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0080] Among them, the central angle of the arc corresponding to the exit of the C-shaped spinneret is 90°, and the diameter of the circle corresponding to the arc is 0.45mm; the side length of the equilateral triangle corresponding to the exit of the triangular spinneret is 0.15mm; the distance between the second oil roller and the first oil roller is 30mm; the radius of the central circle is 5mm; the central angle of the arc corresponding to the C-shaped line is 110°, and the radius of the circle corresponding to the arc is 4mm; there are 20 C-shaped lines; the radii of the second oil roller and the pressure roller are both 10mm; the diameter of the filament is 0.12mm smaller than the gap between the pressure roller and the second oil roller; when oiling, the surface linear velocity of the first oil roller is 96% of the filament stretching speed, the surface linear velocity of the second oil roller is 91% of the surface linear velocity of the first oil roller, the surface linear velocity of the pressure roller is the same as that of the second oil roller, the covering angle α is 5°, and the filament path angle deflection angle β is 5°;

[0081] The process parameters include: extrusion temperature 295℃, cooling air temperature 23℃, cooling air relative humidity 85%, cooling air pressure 18Pa, oil content 0.39%, and winding speed 2800m / min.

[0082] The final shaped fiber has a specification of 15 dtex / 12f, a tension CV value of 1.1%, and a full roll rate of 99.3%.

[0083] Example 2

[0084] A method for preparing profiled fibers, using the above-mentioned apparatus for preparing profiled fibers, the overall process flow is: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0085] Among them, the central angle of the arc corresponding to the exit of the C-shaped spinneret is 91°, and the diameter of the circle corresponding to the arc is 0.35mm; the side length of the equilateral triangle corresponding to the exit of the triangular spinneret is 0.15mm; the distance between the second oil roller and the first oil roller is 35mm; the radius of the central circle is 5.5mm; the central angle of the arc corresponding to the C-shaped line is 115°, and the radius of the circle corresponding to the arc is 4.5mm; there are 19 C-shaped lines; the radius of the second oil roller and the pressure roller is 11mm; the diameter of the filament is 0.11mm smaller than the gap between the pressure roller and the second oil roller; when oiling, the surface linear velocity of the first oil roller is 95% of the filament stretching speed, the surface linear velocity of the second oil roller is 90% of the surface linear velocity of the first oil roller, the surface linear velocity of the pressure roller is the same as that of the second oil roller, the covering angle α is 4.5°, and the filament path angle deflection angle β is 4.5°;

[0086] The process parameters include: extrusion temperature 295.5℃, cooling air temperature 22.5℃, cooling air relative humidity 86%, cooling air pressure 19Pa, oil content 0.4%, and winding speed 2760m / min.

[0087] The final shaped fiber has a specification of 20 dtex / 18f, a tension CV value of 1.3%, and a full roll rate of 99.15%.

[0088] Example 3

[0089] A method for preparing profiled fibers, using the above-mentioned apparatus for preparing profiled fibers, the overall process flow is: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0090] Among them, the central angle of the arc corresponding to the exit of the C-shaped spinneret is 91.5°, and the diameter of the circle corresponding to the arc is 0.35mm; the side length of the equilateral triangle corresponding to the exit of the triangular spinneret is 0.12mm; the distance between the second oil roller and the first oil roller is 35mm; the radius of the central circle is 5.5mm; the central angle of the arc corresponding to the C-shaped line is 115°, and the radius of the circle corresponding to the arc is 4.5mm; there are 19 C-shaped lines; the radius of the second oil roller and the pressure roller is 11mm; the diameter of the filament is 0.1mm smaller than the gap between the pressure roller and the second oil roller; when oiling, the surface linear velocity of the first oil roller is 94% of the filament stretching speed, the surface linear velocity of the second oil roller is 89% of the surface linear velocity of the first oil roller, the surface linear velocity of the pressure roller is the same as that of the second oil roller, the wrapping angle α is 3°, and the filament path angle deflection angle β is 3°;

[0091] The process parameters include: extrusion temperature 296℃, cooling air temperature 22℃, cooling air relative humidity 86%, cooling air pressure 20.5Pa, oil content 0.41%, and winding speed 2750m / min.

[0092] The final shaped fiber has a specification of 20dtex / 20f, a tension CV value of 1.3%, and a full roll rate of 99.1%.

[0093] Example 4

[0094] A method for preparing profiled fibers, using the above-mentioned apparatus for preparing profiled fibers, the overall process flow is: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0095] Among them, the central angle of the arc corresponding to the exit of the C-shaped spinneret is 92°, and the diameter of the circle corresponding to the arc is 0.5mm; the side length of the equilateral triangle corresponding to the exit of the triangular spinneret is 0.14mm; the distance between the second oil roller and the first oil roller is 35mm; the radius of the central circle is 5.5mm; the central angle of the arc corresponding to the C-shaped line is 115°, and the radius of the circle corresponding to the arc is 4.5mm; there are 19 C-shaped lines; the radius of the second oil roller and the pressure roller is 11mm; the diameter of the filament is 0.15mm smaller than the gap between the pressure roller and the second oil roller; when oiling, the surface linear velocity of the first oil roller is 94.5% of the filament stretching speed, the surface linear velocity of the second oil roller is 90.5% of the surface linear velocity of the first oil roller, the surface linear velocity of the pressure roller is the same as that of the second oil roller, the wrapping angle α is 4°, and the filament path angle deflection angle β is 4°;

[0096] The process parameters include: extrusion temperature 295.5℃, cooling air temperature 21℃, cooling air relative humidity 87%, cooling air pressure 20.5Pa, oil content 0.4%, and winding speed 2850m / min.

[0097] The final shaped fiber has a specification of 25 dtex / 18f, a tension CV value of 1.15%, and a full roll rate of 99.4%.

[0098] Example 5

[0099] A method for preparing profiled fibers, using the above-mentioned apparatus for preparing profiled fibers, the overall process flow is: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0100] Among them, the central angle of the arc corresponding to the exit of the C-shaped spinneret is 93°, and the diameter of the circle corresponding to the arc is 0.4mm; the side length of the equilateral triangle corresponding to the exit of the triangular spinneret is 0.1mm; the distance between the second oil roller and the first oil roller is 38mm; the radius of the central circle is 6mm; the central angle of the arc corresponding to the C-shaped line is 120°, and the radius of the circle corresponding to the arc is 5mm; there are 18 C-shaped lines; the radii of the second oil roller and the pressure roller are both 12mm; the diameter of the filament is 0.12mm smaller than the gap between the pressure roller and the second oil roller; when oiling, the surface linear velocity of the first oil roller is 95% of the filament stretching speed, the surface linear velocity of the second oil roller is 90% of the surface linear velocity of the first oil roller, the surface linear velocity of the pressure roller is the same as that of the second oil roller, the covering angle α is 4.5°, and the filament path angle deflection angle β is 4.5°;

[0101] The process parameters include: extrusion temperature 295.5℃, cooling air temperature 22℃, cooling air relative humidity 86%, cooling air pressure 21Pa, oil content 0.42%, and winding speed 2790m / min.

[0102] The final shaped fiber has a specification of 28 dtex / 24f, a tension CV value of 1.25%, and a full roll rate of 99.15%.

[0103] Example 6

[0104] A method for preparing profiled fibers, using the above-mentioned apparatus for preparing profiled fibers, the overall process flow is: polyester melt extrusion → cooling and forming → oiling → winding and forming;

[0105] Among them, the central angle of the arc corresponding to the exit of the C-shaped spinneret is 93°, and the diameter of the circle corresponding to the arc is 0.5mm; the side length of the equilateral triangle corresponding to the exit of the triangular spinneret is 0.1mm; the distance between the second oil roller and the first oil roller is 40mm; the radius of the central circle is 6mm; the central angle of the arc corresponding to the C-shaped line is 120°, and the radius of the circle corresponding to the arc is 5mm; there are 18 C-shaped lines; the radii of the second oil roller and the pressure roller are both 12mm; the diameter of the filament is 0.15mm smaller than the gap between the pressure roller and the second oil roller; when oiling, the surface linear velocity of the first oil roller is 94% of the filament stretching speed, the surface linear velocity of the second oil roller is 89% of the surface linear velocity of the first oil roller, the surface linear velocity of the pressure roller is the same as that of the second oil roller, the covering angle α is 3°, and the filament path angle deflection angle β is 3°;

[0106] The process parameters include: extrusion temperature 295.5℃, cooling air temperature 21℃, cooling air relative humidity 87%, cooling air pressure 21Pa, oil content 0.42%, and winding speed 2820m / min.

[0107] The final shaped fiber has a specification of 33dtex / 24f, a tension CV value of 1.2%, and a full roll rate of 99.25%.

[0108] Comparative Example 1

[0109] A method for preparing irregularly shaped fibers is basically the same as in Example 5, except that the oil nozzle in the apparatus used for preparing irregularly shaped fibers does not contain a pressure roller.

[0110] The final shaped fiber has a specification of 28 dtex / 24f, a tension CV value of 1.85%, and a full roll rate of 97.36%.

[0111] Compared with Example 5, the shaped fiber obtained in Comparative Example 1 has a larger tension CV value and a lower full roll rate. This is because in Comparative Example 1, when the filaments are bundled, the monofilaments are gathered into a multifilament at the second oil roller. However, the oiling agent of the shaped filament has poor adhesion, and the oiling agent cannot penetrate well into each inner layer of monofilaments, resulting in a large difference in oil content between the inner and outer layers of the filament. When stretched, this is reflected in a larger tension CV value, which makes it easier for monofilaments to break and thus results in a lower full roll rate.

[0112] Comparative Example 2

[0113] A method for preparing shaped fibers is basically the same as in Example 6, except that the first oil roller inside the oil nozzle in the apparatus used for preparing shaped fibers is a round roller with a radius of 16 mm.

[0114] The final shaped fiber has a specification of 33dtex / 24f, a tension CV value of 2.88%, and a full roll rate of 95.85%.

[0115] Compared with Example 6, the shaped fiber obtained in Comparative Example 2 has a larger tension CV value and a lower full roll rate. This is because the round roller cannot store the oil well, causing the oil to overflow from the C-groove, resulting in insufficient oil on the filament, higher tension, very low oil content in the inner layer filament, higher tension CV value, and the filament is prone to breakage, resulting in a low full roll rate.

Claims

1. A multi-roller oiling device, comprising an oil nozzle (5) and an oil pump (5.8), wherein the oil nozzle (5) has a U-shaped structure and is composed of a front side wall, a left side wall, and a rear side wall connected in sequence, and the left side wall is provided with an oil inlet and an oil outlet (5.13), characterized in that, It also includes a first oil baffle (5.31), a second oil baffle (5.32), a jacket (5.2), and a first oil roller (5.3), a second oil roller (5.4), and a pressure roller (5.9) located in the wire feeding channel of the oil nozzle (5). The first oil roller (5.3), the second oil roller (5.4), and the pressure roller (5.9) are all parallel to the front-back direction and are each driven by a drive device to rotate around their own central axis; the second oil roller (5.4) is located below the first oil roller (5.3), and the rightmost sides of both are on the same vertical plane and located on the right side of the left side wall, and the two rotate in the same direction; the pressure roller (5.9) is located to the right of the second oil roller (5.4), and there is a gap between them, and the two rotate in opposite directions; the part of the left side wall located below the oil outlet (5.13) protrudes to the right relative to the oil outlet (5.13), and the upper surface of the protruding part is provided with a C-shaped groove (5.14) connected to the oil outlet (5.13), the groove opening of the C-shaped groove (5.14) faces upward and the groove opening direction is parallel to the front-back direction; The first oil roller (5.3) is located to the right of the oil outlet (5.13) and is embedded in the C-shaped groove (5.14); the cross-section of the first oil roller (5.3) consists of a central circle (5.34) and multiple C-shaped lines (5.35), one end of all the C-shaped lines (5.35) is connected to the central circle (5.34), and the other end is away from the central circle (5.34). All the C-shaped lines (5.35) are evenly distributed around the central circumference of the central circle (5.34); The C-shaped line (5.35) is an arc with a central angle of 110-120° and a radius of 4-5 mm. The straight line containing the two endpoints of the C-shaped line (5.35) passes through the center of the central circle (5.34). The radius of the central circle (5.34) is 5-6 mm, and there are 18-20 C-shaped lines (5.35). The end of the C-shaped line (5.35) away from the central circle (5.34) is smoothly connected to the main body of the C-shaped line (5.35). The first oil baffle (5.31) and the second oil baffle (5.32) respectively block the two ends of the first oil roller (5.3); Both the second oil roller (5.4) and the leather pressure roller (5.9) are round rollers with a radius of 10-12 mm; the surface of the second oil roller (5.4) is ceramic, and the surface of the leather pressure roller (5.9) is PU. The distance between the second oil roller (5.4) and the first oil roller (5.3) is 30-40mm; The jacket (5.2) wraps around the outer wall of the nozzle (5), and the two form a closed space. The jacket (5.2) is provided with an air inlet (5.5) and an air outlet (5.6).

2. The multi-roller oiling device according to claim 1, characterized in that, The upper oil pump (5.8) includes n oil pump quick connectors (5.81), and n≥1; There are n nozzles in total (5). The multi-roller oiling device also includes a one-way switching device (5.10), an air supply device, a three-way check valve, an oil supply pipe (5.7), and a fourth air pipe (8.6). The one-way conversion device (5.10) consists of a coaxial cylindrical tube and a frustum. One end of the cylindrical tube is sealed to the small end of the frustum, and the other end is the air inlet (5.11). The large end of the frustum is sealed, and n air outlets (5.12) are evenly distributed around the central axis of the frustum on the side wall near the large end. The air inlet (5.11) is connected to the air delivery device; Each air outlet (5.12) is connected to the threaded end of a three-way check valve. One end of each three-way check valve is connected to an upper oil pipe (5.7). The other end of each three-way check valve is connected to a fourth air pipe (8.6). All upper oil pipes (5.7) are connected to the oil inlet of different oil nozzles (5). All fourth air pipes (8.6) are connected to different oil pump quick connectors (5.81).

3. The multi-roller oiling device according to claim 2, characterized in that, The air supply device includes a cylinder (8), a first air pipe (8.1), a second air pipe (8.2), a main air inlet pipe (8.4), a three-position four-way valve (8.3), a third air pipe (8.5), and an air source (8.7). The cylinder (8) has two air outlets on its cylinder barrel. The two air outlets are located near the two ends of the cylinder barrel. The two air outlets are connected to one end of the first air pipe (8.1) and the second air pipe (8.2). The other ends of the first air pipe (8.1) and the second air pipe (8.2) and one end of the main air intake pipe (8.4) are connected to the three air intake ends of the three-position four-way valve (8.3). The other end of the main air intake pipe (8.4) is connected to the air source (8.7). The air outlet end of the three-position four-way valve (8.3) is connected to one end of the third air pipe (8.5), and the other end of the third air pipe (8.5) is connected to the air intake end (5.11).

4. An apparatus for preparing irregularly shaped fibers, characterized in that, It includes a multi-roller oiling device as described in claim 3, a spinneret and a bellows (7), wherein the bellows (7) is located above the cylinder (8) and is fixedly connected to the piston rod of the cylinder (8).

5. A method for preparing irregularly shaped fibers, characterized in that, Using the shaped fiber preparation apparatus as described in claim 4, the diameter of the filament is 0.1-0.15 mm smaller than the gap between the pressure roller (5.9) and the second oil roller (5.4); wherein, during oiling, the surface linear velocity of the first oil roller (5.3) is 94%-96% of the filament stretching speed, the surface linear velocity of the second oil roller (5.4) is 89%-91% of the surface linear velocity of the first oil roller (5.3), the surface linear velocity of the pressure roller (5.9) is the same as that of the second oil roller (5.4), and the values ​​of the covering angle α and the filament path angle deflection angle β are both in the range of 3°-5°.

6. The method for preparing irregularly shaped fibers according to claim 5, characterized in that, There are two types of spinneret holes on the spinneret: C-type spinneret holes and triangular spinneret holes; The outlet shape of the C-type spinneret is an arc, with a central angle of 90-93° and a diameter of 0.35-0.5 mm corresponding to the arc. The outlet shape of the triangular spinneret is an equilateral triangle with a side length of 0.1-0.15 mm. All C-type spinnerets are arranged in concentric circles around the center of the spinneret, with the C-type spinnerets on adjacent circles being staggered, and the opening of the C-type spinneret outlet shape is away from the center of the spinneret. The number of C-type spinnerets and triangular spinnerets is the same, and they correspond one-to-one. The triangular spinnerets are located inside the corresponding C-type spinnerets, and the centers of their outlet shapes coincide. One vertex of the outlet shape of the triangular spinneret is directly opposite the opening of the outlet shape of the C-type spinneret. The overall process flow is as follows: polyester melt extrusion → cooling and forming → oiling → winding and forming; The process parameters include: extrusion temperature 295-296℃, cooling air temperature 21-23℃, cooling air relative humidity 85-87%, cooling air pressure 18-21Pa, oil content 0.39-0.42%, and winding speed 2750-2850m / min. The specifications of the shaped fibers are 15-33 dtex / 12-24f, the tension CV value is 1.1-1.3%, and the full roll rate is 99.1-99.4%.

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