Spinning tension control device and application thereof

Abstract

The invention belongs to the technical field of spinning, and discloses a spinning tension control device and application thereof.The spinning device comprises a cooling device and an oiling device, and the spinning tension control device comprises a hollow circular ring; the hollow circular ring is horizontally arranged and is provided with an air inlet and an air outlet; the air inlet is used for introducing compressed air; the air outlet is annular, and the central axis of the air outlet coincides with the central axis of the hollow circular ring; the hollow circular ring is placed between the cooling device and the oiling device, and the hollow circular ring is used for allowing the tows cooled by the cooling device to pass through; when compressed air enters the hollow circular ring from the air inlet and comes out from the air outlet, the compressed air is blown to all monofilaments in the tow above the hollow circular ring. Resistance is brought to the tows through air compression, the tension of the tows can be improved, the uniformity of the tension can be improved, and damage to the tows is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinning, and relates to a spinning tension control device and its application. Background Art

[0002] The spinning process mainly involves the steps of cooling the filaments by air after they come out, then oiling, stretching (if it is POY filaments, there is no stretching), and winding. If the tension during the cooling to oiling process is not well controlled, especially if the tension at the inlet of the oil nozzle (or oil wheel) is too large or too small, the filaments will jump on the oil nozzle (or oil wheel), resulting in uneven oiling, which will cause single filaments to break, generating hairiness and broken ends, and affecting product quality and production efficiency. Among them, the tension is the axial tensile force suffered by the filaments during the fiber forming process, and its essence is the mechanical balance formed by the filaments overcoming various resistances in the spinning process.

[0003] Spinning technology mainly achieves the purpose of tension adjustment through equipment contact. For example, in the production of FDY (spinning speed above 1800 m / min) and POY (spinning speed above 2500 m / min), the spinning speed is relatively high, and the tension of the filament bundle entering the oil nozzle is relatively large, especially the tension at the inlet of the oil nozzle is relatively large, which increases the friction. Therefore, it is necessary to reduce the tension. In the production process of industrial filament products, since the spinning speed (i.e., the speed of the first pair of hot rollers) is 418 - 570 m / min, the spinning tension is relatively low, and the tension of the filament bundle entering the oil nozzle is too low, which will cause the single filaments to shake above the oil nozzle, resulting in uneven single filament thickness and uneven oiling. During the stretching process, single filament breakage is likely to occur, resulting in broken ends and hairiness reduction of the product. Therefore, it is necessary to increase the tension. Patent Application No. CN202023094938.4 provides a spinning tension precise adjustment device, which realizes the precise adjustment of the tension of the spinning body through a specific mechanical structure design; Patent Application No. CN202321403988.7 provides a spinning tension adjustment device, which real-time monitors the filament bundle tension through a tension sensor and adjusts the output of the motor through a controller, so as to realize the precise adjustment of the tension during the full roll switching of spinning. In addition, in the actual production process, a wire pressing device is also added above the oil nozzle (or oil wheel) to increase the resistance of the filament bundle, thereby increasing the tension of the filament bundle at the inlet of the oil nozzle (or oil wheel).

[0004] However, the above methods mainly have the following disadvantages:

[0005] (1) Since the filament bundle is not oiled, if the resistance is increased through equipment contact, it will increase the damage of the filaments and affect the mechanical properties;

[0006] (2) Such as Figure 1As shown in the figure, when the tow 2 contacts the wire pressing device 9, only some of the filaments in the tow 2 contact the wire pressing device 9, and the remaining filaments cannot contact the wire pressing device 9. The filaments in contact with the wire pressing device 9 are subject to greater frictional force, while the filaments not in contact with the wire pressing device 9 are subject to smaller frictional force. The different frictional forces result in uneven tensions of the filaments near and far from the wire pressing device 9, making the thickness of the filaments in the tow 2 uneven during the subsequent stretching process, and further leading to poor evenness of the product sliver;

[0007] (3) Since the tow contacts and rubs against the equipment, heat is easily generated. Due to the local frictional heat generation before drafting, the activity of macromolecules increases, thus forming a certain amorphous region and reducing the pre-crystallinity. Internal stress gradients are likely to occur in different filaments of a tow and different regions of the same filament, and thus problems such as broken ends and fuzziness are likely to occur during the subsequent stretching process.

[0008] Therefore, it is of great significance to study a spinning tension control device and its application to solve the above problems. Summary of the Invention

[0009] The purpose of the present invention is to solve the problems in the prior art and provide a spinning tension control device and its application.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0011] A spinning tension control device, the spinning device includes a cooling device and an oiling device, and the spinning tension control device includes a hollow ring;

[0012] The hollow ring is horizontally placed, and an air inlet and an air outlet are provided on the hollow ring; the air inlet is used for introducing compressed air; the air outlet is annular, and the central axis of the air outlet coincides with the central axis of the hollow ring;

[0013] The hollow ring is placed between the cooling device and the oiling device, and the hollow ring is used for the tow cooled by the cooling device to pass through;

[0014] When the compressed air enters the hollow ring from the air inlet and exits from the air outlet, the compressed air blows all the filaments in the tow above the hollow ring;

[0015] In use, the spinning tension control device is arranged above the oiling device, and the tow is made to pass through the hollow ring of the spinning tension control device; when the compressed air moves towards the directly above the center of the hollow ring, the tow moves from top to bottom, so that the compressed air brings resistance to the tow, thereby increasing the tension of the tow; since it is in contact with air, the air can be evenly blown to each single filament through the gaps between the single filaments, thereby improving the uniformity of the tension; in addition, the equipment (spinning tension adjusting device) in the prior art mainly contacts a part of the surface of the filament, mainly a single-sided contact, and when the equipment contacts, due to the relatively high friction coefficient of the equipment surface, it is easy to damage the filament; while the air contacts the filament evenly distributed on the surface of the filament, and the friction coefficient of the air macromolecules is small, and under the condition of generating the same resistance, the damage to the tow is smaller.

[0016] As a preferred technical solution:

[0017] For a spinning tension control device as described above, the spinning tension control device further includes an air inlet pipe, one end of the air inlet pipe is connected to the air inlet, and the other end of the air inlet pipe is used for introducing compressed air.

[0018] For a spinning tension control device as described above, the spinning tension control device further includes an air inlet regulating valve, the air inlet regulating valve is arranged on the air inlet pipe, and the air inlet regulating valve is used for controlling the air intake volume, thereby controlling the air outlet speed.

[0019] For a spinning tension control device as described above, the spinning tension control device further includes a temperature control device, the temperature control device is used for controlling the temperature of the compressed air, and the temperature control device is a prior art.

[0020] For a spinning tension control device as described above, the inner diameter of the hollow ring is 2.5 cm to 10 cm.

[0021] For a spinning tension control device as described above, the cross-section of the hollow ring provided with an air outlet is a circle with a notch; denote the midpoint of the connection line of the two end points of the circle with a notch as point A, and the center of the circle with a notch as point B; the included angle between the connection line of point A and point B and the horizontal plane where point B is located is 30° to 80°. If the angle is less than 30°, plus the tow has a downward movement, driving the surrounding air flow to flow downward, then under the combined action of the air flow blown by this device and the air flow around the tow, the overall direction is almost perpendicular to the tow direction, and the effect of tension adjustment is small; while if it is greater than 80°, the air flow direction is almost parallel to the tow, and it is not easy for the air to enter the gaps between the tows, and the resistance effect on the inner tows will be weakened.

[0022] For a spinning tension control device as described above, the length of the connection line of the two end points of the circle with a notch is 2 mm to 8 mm, and the diameter of the circle is 6 mm to 20 mm.

[0023] The present invention also provides an application of a spinning tension control device as described in any one of the above. After the polyester melt is extruded through a spinneret and cooled, it passes through the hollow ring of the spinning tension control device, and then successively passes through oiling, first-roll drawing, second-roll drawing, pre-networking, third-roll drawing, fourth-roll drawing, fifth-roll drawing, main networking, and winding to obtain polyester fibers.

[0024] As a preferred technical solution:

[0025] For the application of a spinning tension control device as described above, the process parameters include: the melt viscosity is 0.95 - 1.16 dL / g, the temperature of the spinning box is 292 - 320 °C, the side blow air speed is 0.6 - 1.0 m / min; the speed of the oil agent pump is 12 - 26 rpm, the speed of the first roll is 418 - 570 m / min, the temperature of the first roll is 25 - 83 °C, the speed of the second roll is 430 - 590 m / min, the temperature of the second roll is 95 - 105 °C, the speed of the third roll is 1670 - 2400 m / min, the temperature of the third roll is 130 - 138 °C, the speed of the fourth roll is 2570 - 3400 m / min, the temperature of the fourth roll is 235 - 245 °C, the speed of the fifth roll is 2540 - 3350 m / min, the temperature of the fifth roll is 160 - 170 °C, the winding speed is 2500 - 3350 m / min, the pre-network pressure is 1.2 - 3 bar, the main network pressure is 3 - 3.8 bar, the air speed at the air outlet of the tension control device is 0.05 - 0.3 m / s, the temperature of the compressed air is 25 °C - 65 °C, the temperature control of the compressed air generally cannot be lower than the ambient temperature and the highest cannot exceed the glass transition temperature of the nascent fiber, and the tension control device is located 25 cm - 100 cm above the oiling device; among them, the method for testing the air speed at the air outlet is: cool the anemometer to 30 °C, and then place the anemometer close to the air outlet of the tension control device to test the air speed here.

[0026] For the application of a spinning tension control device as described above, the fineness of the obtained polyester fibers is 550 dtex - 1500 dtex, the downgrading rate of hairiness is not more than 0.05%, the breakage rate is not more than 0.15%, the breaking strength is not less than 8.5 cN / dtex, and the breaking elongation is 14.7%.

[0027] Beneficial effects:

[0028] The spinning tension control device of the present invention brings resistance to the tow through compressed air, which not only improves the tension of the tow but also improves the uniformity of the tension. In addition, due to the small friction coefficient of air macromolecules, under the condition of generating the same resistance, the damage to the tow will be smaller. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of the contact between the equipment and the tow in the prior art;

[0030] Figure 2 This is a schematic structural diagram when the spinning tension control device of the present invention is in use;

[0031] Figure 3 This is a schematic diagram of the spinning tension control device of the present invention;

[0032] Figure 4 This is a schematic cross-sectional view of the hollow ring of the present invention;

[0033] Figure 5 This is a partial enlarged view of the cross-section of the hollow ring of the present invention;

[0034] Figure 6 This is a schematic diagram of the angle between the line connecting point A and point B of the present invention and the horizontal plane where point B is located;

[0035] Among them, 1 - spinneret plate, 2 - tow, 3 - compressed air, 4 - air inlet, 5 - temperature control device, 6 - oil nozzle, 7 - air outlet, 8 - air inlet regulating valve, 9 - wire pressing device. Specific embodiments

[0036] The following further elaborates the present invention in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not 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 also fall within the scope defined by the appended claims of this application.

[0037] The test methods for relevant performance indicators in the following examples and comparative examples are as follows:

[0038] Rate of downgrading due to hairiness: Take the polyester fibers prepared in each example and comparative example as samples, then take 10,000 continuously produced cake filaments, inspect their appearance, and count the proportion of the number of cake filaments with downgrading due to hairiness in the total number of cake filaments, that is, the rate of downgrading due to hairiness; among them, the standard for downgrading due to hairiness is that a single cake filament cannot exceed 3 hairs or looped filaments.

[0039] Breakage rate: Take the polyester fibers prepared in each example as samples, then take 10,000 continuously produced cake filaments, count the number of small rolls generated by breakage, and then divide it by the total number of cake filaments to obtain the breakage rate.

[0040] Breaking strength and elongation at break: The polyester fibers prepared in each example were used as samples. Then, referring to the standard of GB / T 14344-2022, using the STATIMAT 4U instrument, the specimens were stretched until fracture under the test conditions with an automatic tensile strength and elongation tester, and the breaking strength and elongation at break were automatically calculated by computer. The breaking strength is the ratio of the tensile strength to the linear density. Among them, the test conditions are as follows: the nominal clamping length is 500 mm, the test speed is 500 mm / min, the pre-tension is 0.05 cN / dtex, and the number of tests is 5 times for each sample (the breaking strength and elongation at break of the present invention are the average values after 5 tests).

[0041] Example 1

[0042] A spinning tension control device, as Figures 2 to 6 shown. The spinning device includes a cooling device and an oiling device. The spinning tension control device includes a hollow ring, an air inlet pipe, a temperature control device 5, and an air inlet regulating valve 8;

[0043] The hollow ring is placed horizontally, and an air inlet 4 and an air outlet 7 are provided on the hollow ring;

[0044] The air outlet 7 is circular, and the central axis of the air outlet 7 coincides with the central axis of the hollow ring;

[0045] The cross-section of the hollow ring provided with the air outlet 7 is a circular shape with a notch; Denote the midpoint of the connection line of the two end points of the circular shape with a notch as point A, and the center of the circular shape with a notch as point B; The included angle between the connection line of point A and point B and the horizontal plane where point B is located is 20°-80°;

[0046] The length of the connection line of the two end points of the circular shape with a notch is 2 mm-8 mm, and the diameter of the circular shape is 6 mm-20 mm;

[0047] The inner diameter of the hollow ring is 2.5 cm-10 cm;

[0048] One end of the air inlet pipe is connected to the air inlet 4, and the other end of the air inlet pipe is used to introduce compressed air 3;

[0049] The temperature control device 5 is used to control the temperature of the compressed air 3;

[0050] The air inlet regulating valve 8 is arranged on the air inlet pipe;

[0051] The hollow ring is placed between the cooling device and the oiling device, and the hollow ring is used for the tow 2 cooled by the cooling device to pass through;

[0052] When the compressed air 3 enters the hollow ring from the air inlet 4 and exits from the air outlet 7, the compressed air 3 blows to all the single filaments in the tow 2 above the hollow ring.

[0053] Example 2

[0054] Application of a spinning tension control device, the specific process is as follows:

[0055] As Figure 2 shown, the tow 2 obtained by extruding and cooling the polyester melt with a viscosity of 0.95 dL / g (polycondensed from PTA and EG, and the mass ratio of PTA is 85.5%) through the spinneret 1 passes through the hollow ring of the spinning tension control device described in Example 1, then is oiled through the oil nozzle 6, and then after single-roll drafting, double-roll drafting, pre-networking, triple-roll drafting, quadruple-roll drafting, quintuple-roll drafting, main networking and winding, polyester fibers are obtained; wherein, the angle between the line connecting point A and point B of the spinning tension control device and the horizontal plane where point B is located is 80°, the length of the line connecting the two endpoints of the circular shape with a notch is 2 mm, the diameter of the circular shape is 6 mm, and the inner diameter of the hollow ring is 2.5 cm;

[0056] The process parameters include: the temperature of the spinning box is 292 °C, the side blowing wind speed is 0.6 m / min; the rotation speed of the oil agent pump is 12 rpm, the rotation speed of the single roll is 570 m / min, the temperature of the single roll is 25 °C, the rotation speed of the double roll is 590 m / min, the temperature of the double roll is 95 °C, the rotation speed of the triple roll is 2400 m / min, the temperature of the triple roll is 130 °C, the rotation speed of the quadruple roll is 3400 m / min, the temperature of the quadruple roll is 235 °C, the rotation speed of the quintuple roll is 3350 m / min, the temperature of the quintuple roll is 160 °C, the winding speed is 3350 m / min, the pre-network pressure is 1.2 bar, the main network pressure is 3.5 bar, the wind speed at the air outlet of the tension control device is 0.05 m / s, the temperature of the compressed air is 25 °C, and the tension control device is 25 cm above the oiling device.

[0057] The fineness of the finally obtained polyester fiber is 550 dtex, the downgrading rate of the hairiness is 0.042%, the breakage rate is 0.08%, the breaking strength is 8.52 cN / dtex, and the breaking elongation is 14.8%.

[0058] Comparative Example 1

[0059] Application of a spinning tension control device, which is basically the same as Example 2, except that: the spinning tension control device described in Example 1 is not used.

[0060] The downgrading rate of the hairiness of the finally obtained polyester fiber is 0.12%, the breakage rate is 1.77%, the breaking strength is 8.45 cN / dtex, and the breaking elongation is 14.2%.

[0061] By comparing Comparative Example 1 with Example 2, it can be seen that the degradation rate and breakage rate of the polyester fiber prepared in this comparative example increase, and the breaking strength and breaking elongation decrease. This is because when the spinning speed is low in the process of producing polyester fibers, the tension of the filament bundle is relatively small when entering the oil nozzle, which leads to serious vibration of the single fiber, resulting in uneven thickness and uneven oiling of the single fiber, making it easier for the single fiber with serious vibration to be broken in the subsequent drawing process, which leads to increased degradation rate and breakage rate of the wool, and the single fiber breaks during the test, which ultimately leads to a decrease in breaking strength and breaking elongation.

[0062] Comparative Example 2

[0063] An application of a spinning tension control device is basically the same as that in Example 2, except that the spinning tension control device described in Example 1 is replaced with a wire pressing rod, and the wire pressing rod is installed above the oil nozzle to apply pressure to the yarn bundle to increase the tension of the yarn bundle when entering the oil nozzle, so that the resistance exerted by the wire pressing rod on the yarn bundle is the same as that in Example 2.

[0064] The final polyester fiber had a fiber degradation rate of 0.08%, a breakage rate of 1.36%, a breaking strength of 8.47 cN / dtex, and a breaking elongation of 14.4%.

[0065] By comparing Comparative Example 2 with Example 2, it can be seen that the polyester fiber prepared in this comparative example has increased degradation rate and breakage rate, while reduced breaking strength and elongation at break. This is because the wire pressing rod produces a certain resistance to the filament bundle, which increases the tension of the filament bundle when entering the oil nozzle and improves the uniformity of oiling. However, the wire pressing rod only contacts a part of the monofilament during the pressure application process, resulting in inconsistent tension between the contact part and the non-contact part, and the wire guide rod directly contacts the filament bundle and also damages the surface of the monofilament to a certain extent, making the monofilament more easily broken in the subsequent drawing process, ultimately leading to increased degradation rate and breakage rate of the filament, and due to the breakage of the monofilament during the test, the final breaking strength and elongation at break decrease.

[0066] Example 3

[0067] An application of a spinning tension control device, the specific process is as follows:

[0068] The polyester melt with a viscosity of 0.95 dL / g (polycondensed from PTA and EG, and the mass percentage of PTA is 85.5%) is extruded through a spinneret, cooled, passed through the hollow ring of the spinning tension control device described in Example 1, and then through oiling, first-roll drawing, second-roll drawing, pre-networking, third-roll drawing, fourth-roll drawing, fifth-roll drawing, main networking and winding to obtain polyester fibers; among them, the angle between the line connecting point A and point B of the spinning tension control device and the horizontal plane where point B is located is 60°, the length of the line connecting the two end points of the circular shape with a notch is 4 mm, the diameter of the circle is 12 mm, and the inner diameter of the hollow ring is 6.5 cm;

[0069] The process parameters include: the temperature of the spinning box is 298 °C, the side-blowing wind speed is 0.8 m / min; the rotation speed of the oil pump is 17 rpm, the rotation speed of the first roll is 550 m / min, the temperature of the first roll is 32 °C, the rotation speed of the second roll is 570 m / min, the temperature of the second roll is 96 °C, the rotation speed of the third roll is 2350 m / min, the temperature of the third roll is 135 °C, the rotation speed of the fourth roll is 3200 m / min, the temperature of the fourth roll is 242 °C, the rotation speed of the fifth roll is 3060 m / min, the temperature of the fifth roll is 165 °C, the winding speed is 3000 m / min, the pre-network pressure is 1.8 bar, the main-network pressure is 3.2 bar, the wind speed at the air outlet of the tension control device is 0.1 m / s, the temperature of the compressed air is 30 °C, and the tension control device is 40 cm above the oiling device.

[0070] The fineness of the finally obtained polyester fibers is 840 dtex, the downgrading rate of hairiness is 0.035%, the breakage rate is 0.11%, the breaking strength is 8.57 cN / dtex, and the breaking elongation is 14.7%.

[0071] Example 4

[0072] An application of a spinning tension control device is as follows:

[0073] The polyester melt with a viscosity of 1.12 dL / g (polycondensed from PTA and EG, and the mass percentage of PTA is 85.5%) is extruded through a spinneret, cooled, passed through the hollow ring of the spinning tension control device described in Example 1, and then through oiling, first-roll drawing, second-roll drawing, pre-networking, third-roll drawing, fourth-roll drawing, fifth-roll drawing, main networking and winding to obtain polyester fibers; among them, the angle between the line connecting point A and point B of the spinning tension control device and the horizontal plane where point B is located is 50°, the length of the line connecting the two end points of the circular shape with a notch is 5 mm, the diameter of the circle is 12 mm, and the inner diameter of the hollow ring is 6.5 cm;

[0074] The process parameters include: the temperature of the spinning box is 300 °C, the side blowing air velocity is 0.8 m / min; the rotation speed of the oil agent pump is 20 rpm, the rotation speed of the first roller is 477 m / min, the temperature of the first roller is 35 °C, the rotation speed of the second roller is 489 m / min, the temperature of the second roller is 98 °C, the rotation speed of the third roller is 1870 m / min, the temperature of the third roller is 133 °C, the rotation speed of the fourth roller is 2800 m / min, the temperature of the fourth roller is 238 °C, the rotation speed of the fifth roller is 2787 m / min, the temperature of the fifth roller is 165 °C, the winding speed is 2700 m / min, the pre-network pressure is 2.6 bar, the main network pressure is 3 bar, the air velocity at the air outlet of the tension control device is 0.2 m / s, the temperature of the compressed air is 45 °C, and the tension control device is located 40 cm above the oiling device.

[0075] The fineness of the finally obtained polyester fiber is 1100 dtex, the downgrading rate of hairiness is 0.03%, the breaking rate is 0.08%, the breaking strength is 8.58 cN / dtex, and the breaking elongation is 14.9%.

[0076] Example 5

[0077] The application of a spinning tension control device is as follows:

[0078] The polyester melt with a viscosity of 1.12 dL / g (polycondensed from PTA and EG, and the mass ratio of PTA is 85.5%) is extruded through a spinneret and cooled, then passes through the hollow ring of the spinning tension control device described in Example 1, and then undergoes oiling, first roller drafting, second roller drafting, pre-networking, third roller drafting, fourth roller drafting, fifth roller drafting, main networking and winding to obtain polyester fiber; among them, the angle between the line connecting point A and point B of the spinning tension control device and the horizontal plane where point B is located is 45°, the length of the line connecting the two endpoints of the circular shape with a notch is 8 mm, the diameter of the circular shape is 20 mm, and the inner diameter of the hollow ring is 10 cm;

[0079] The process parameters include: the temperature of the spinning box is 315 °C, the side blowing air velocity is 0.9 m / min; the rotation speed of the oil agent pump is 24 rpm, the rotation speed of the first roller is 448 m / min, the temperature of the first roller is 75 °C, the rotation speed of the second roller is 460 m / min, the temperature of the second roller is 100 °C, the rotation speed of the third roller is 1780 m / min, the temperature of the third roller is 135 °C, the rotation speed of the fourth roller is 2680 m / min, the temperature of the fourth roller is 242 °C, the rotation speed of the fifth roller is 2645 m / min, the temperature of the fifth roller is 170 °C, the winding speed is 2600 m / min, the pre-network pressure is 3 bar, the main network pressure is 3.5 bar, the air velocity at the air outlet of the tension control device is 0.3 m / s, the temperature of the compressed air is 60 °C, and the tension control device is located 100 cm above the oiling device.

[0080] The fineness of the finally obtained polyester fiber is 1300 dtex, the downgrading rate of hairiness is 0.038%, the end breakage rate is 0.14%, the breaking strength is 8.56 cN / dtex, and the breaking elongation is 14.9%.

[0081] Example 6

[0082] The application of a spinning tension control device is as follows:

[0083] The polyester melt with a viscosity of 1.16 dL / g (polycondensed from PTA and EG, and the mass ratio of PTA is 85.5%) is extruded through a spinneret and cooled, then passes through the hollow ring of the spinning tension control device described in Example 1, and then passes through oiling, first-roll drafting, second-roll drafting, pre-networking, third-roll drafting, fourth-roll drafting, fifth-roll drafting, main networking, and winding to obtain polyester fiber; among them, the angle between the line connecting point A and point B of the spinning tension control device and the horizontal plane where point B is located is 30°, the length of the line connecting the two endpoints of the circular shape with a notch is 8 mm, the diameter of the circular shape is 20 mm, and the inner diameter of the hollow ring is 10 cm;

[0084] The process parameters include: the temperature of the spinning box is 320 °C, the side blowing air speed is 1 m / min; the rotation speed of the oil agent pump is 26 rpm, the rotation speed of the first roll is 418 m / min, the temperature of the first roll is 83 °C, the rotation speed of the second roll is 430 m / min, the temperature of the second roll is 105 °C, the rotation speed of the third roll is 1670 m / min, the temperature of the third roll is 138 °C, the rotation speed of the fourth roll is 2570 m / min, the temperature of the fourth roll is 245 °C, the rotation speed of the fifth roll is 2540 m / min, the temperature of the fifth roll is 168 °C, the winding speed is 2500 m / min, the pre-networking pressure is 3 bar, the main networking pressure is 3.8 bar, the air speed at the air outlet of the tension control device is 0.3 m / s, the temperature of the compressed air is 65 °C, and the tension control device is 80 cm above the oiling device.

[0085] The fineness of the finally obtained polyester fiber is 1500 dtex, the downgrading rate of hairiness is 0.048%, the end breakage rate is 0.13%, the breaking strength is 8.67 cN / dtex, and the breaking elongation is 14.9%.

Claims

1. A spinning tension control device, wherein the spinning device includes a cooling device and an oiling device, characterized in that, The spinning tension control device includes a hollow ring; The hollow ring is placed horizontally, and an air inlet and an air outlet are provided on the hollow ring; the air inlet is used to introduce compressed air; the air outlet is annular, and the central axis of the air outlet coincides with the central axis of the hollow ring; The hollow ring is placed between the cooling device and the oiling device, and the hollow ring is used for the tow cooled by the cooling device to pass through; When the compressed air enters the hollow ring from the air inlet and exits from the air outlet, the compressed air blows to all the single filaments in the tow above the hollow ring.

2. The spinning tension control device according to claim 1, characterized in that, The spinning tension control device further includes an air inlet pipe, one end of the air inlet pipe is connected to the air inlet, and the other end of the air inlet pipe is used to introduce compressed air.

3. The spinning tension control device according to claim 2, characterized in that, The spinning tension control device further includes an air inlet regulating valve, and the air inlet regulating valve is arranged on the air inlet pipe.

4. The spinning tension control device according to claim 3, wherein The spinning tension control device further includes a temperature control device, and the temperature control device is used to control the temperature of the compressed air.

5. The spinning tension control device according to claim 4, wherein The inner diameter of the hollow ring is 2.5 cm to 10 cm.

6. The spinning tension control device according to claim 5, characterized in that, The cross-section of the hollow ring with the air outlet is a circular shape with a notch; denote the midpoint of the connection line of the two end points of the circular shape with the notch as point A, and the center of the circular shape with the notch as point B; the included angle between the connection line of point A and point B and the horizontal plane where point B is located is 30° to 80°.

7. The spinning tension control device according to claim 6, characterized in that, The length of the connection line of the two end points of the circular shape with the notch is 2 mm to 8 mm, and the diameter of the circular shape is 6 mm to 20 mm.

8. Use of a spinning tension control device according to any one of claims 1 to 7, characterized in that, After the polyester melt is extruded through the spinneret plate and cooled, it passes through the hollow ring of the spinning tension control device, and then successively passes through oiling, first-roll drawing, second-roll drawing, pre-networking, third-roll drawing, fourth-roll drawing, fifth-roll drawing, main-networking and winding to obtain polyester fibers.

9. The application of a spinning tension control device according to claim 8, characterized in that, The process parameters include: the melt viscosity is 0.95 to 1.16 dL / g, the temperature of the spinning box is 292 to 320 °C, the side blowing air speed is 0.6 to 1.0 m / min; the rotation speed of the oil agent pump is 12 to 26 rpm, the rotation speed of the first roll is 418 to 570 m / min, the temperature of the first roll is 25 to 83 °C, the rotation speed of the second roll is 430 to 590 m / min, the temperature of the second roll is 95 to 105 °C, the rotation speed of the third roll is 1670 to 2400 m / min, the temperature of the third roll is 130 to 138 °C, the rotation speed of the fourth roll is 2570 to 3400 m / min, the temperature of the fourth roll is 235 to 245 °C, the rotation speed of the fifth roll is 2540 to 3350 m / min, the temperature of the fifth roll is 160 to 170 °C, the winding speed is 2500 to 3350 m / min, the pre-network pressure is 1.2 to 3 bar, the main-network pressure is 3 to 3.8 bar, the air speed at the air outlet of the tension control device is 0.05 to 0.3 m / s, the temperature of the compressed air is 25 °C to 65 °C, and the tension control device is 25 cm to 100 cm above the oiling device.

10. The application of a spinning tension control device according to claim 9, characterized in that, The fineness of the obtained polyester fibers is 550 dtex to 1500 dtex, the downgrading rate of hairiness is not more than 0.05%, the breakage rate is not more than 0.15%, the breaking strength is not less than 8.5 cN / dtex, and the breaking elongation is 14.7% to 14.9%.

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