Method for adding network points to polyester industrial yarn with large single filament fineness and network device used therefor

Abstract

The present invention belongs to the technical field of spinning, and relates to a method for adding network points to polyester industrial yarns with a large single filament fineness and a network device used therefor. A network device for adding network points to polyester industrial yarns with a large single filament fineness is internally provided with a filament bundle channel, a compressed air channel, and a jet rotation device; an air flow channel is provided in the jet rotation device, and the air flow channel is the only channel between the filament bundle channel and the compressed air channel. The air flow channel is a cylindrical channel, and the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is greater than 0° and less than 90°; the inner surface of the filament bundle channel is jointly composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b. A method for adding network points to polyester industrial yarns with a large single filament fineness is to pass the polyester industrial yarns with a large single filament fineness through the filament bundle channel of the above-mentioned network device, and continuously introduce compressed air into the compressed air channel. The network device and method provided by the present invention can improve the network degree of polyester industrial yarns with a large single filament fineness.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinning, and particularly relates to a method for adding network points to polyester industrial yarns with a large single-filament fineness and a network device used therefor. Background Art

[0002] Polyester industrial yarns are high-performance materials widely used in multiple fields such as automobile tires, fire hoses, pipe skeletons, lifting ropes and nets, and canvases. They have various types and specifications to meet the requirements of different application scenarios. The production of thick-denier polyester industrial yarns requires first combining single filaments and then passing them through a network device to form a yarn bundle with certain network points and network degrees. The yarn bundle after networking has stable, uniform, and dense network points, and the yarn bundle has good cohesion and does not disperse and runs stably during the weaving process. Therefore, studying the networking method of polyester industrial yarns has important application value.

[0003] Currently, the fineness of polyester industrial yarns produced by the one-step method is between 80 - 8800 dtex, the number of filaments in a bundle is between 48 - 976, and the maximum single-filament fineness can reach about 20 dtex according to customer requirements. For example, the single-filament fineness of 1690 dtex / 96f is 17.6 dtex, and the single-filament fineness of 560 dtex / 28f is 20 dtex. When networking, if a conventional main network nozzle continuously sprays vertical air flow to impact the polyester fibers passing through the network device's filament channel, due to the large single-filament fineness and high rigidity of the single filaments, it is difficult for the yarn bundle to generate an entangled structure due to vibration in the network device, and it is difficult for the yarn bundle to form a uniform and firm network structure.

[0004] To overcome this defect, prior art has been studied. For example, patent CN209537712U provides a winding device capable of improving the network degree of thick-denier yarns, including a first support seat, a second support seat, a third support seat, a first driving motor, a second driving motor, an oil wheel, a pre-network device, a cold roller, a hot roller, a main network device, a reversing wheel, a winding machine, and a spare network device; the thick-denier yarn is first networked for the first time by the main network device, and then networked for the second time by the spare network device. Without increasing the network pressure, it avoids wire breakage caused by excessive shaking of the yarn bundle. However, for industrial yarns with a large single-filament fineness, due to the high hardness of the yarn bundle, it is difficult to generate a winding structure during high-frequency vibration. Using this winding device with a double network device is still difficult to improve the winding structure and network degree of industrial yarns with a large single-filament fineness. At the same time, the compressed air flow consumed by the double network device doubles, which is not conducive to saving compressed air.

[0005] Therefore, for polyester industrial yarns with a large single-filament fineness, it is necessary to develop a method for adding network points and a network device used therefor that can improve the network degree and save compressed air. Summary of the Invention

[0006] The object of the present invention is to solve the problems existing in the prior art and provide a method for adding network points to polyester industrial yarns with a large single filament fineness and a network device used therefor.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A network device for adding network points to polyester industrial yarns with a large single filament fineness, which is internally provided with a filament bundle channel and a compressed air channel. The extending direction of the filament bundle channel is parallel to the front-rear direction, the compressed air channel is located below the filament bundle channel, and an air jet rotating device is also provided inside;

[0009] The air jet rotating device is installed at the junction of the filament bundle channel and the compressed air channel;

[0010] An air flow channel is provided inside the air jet rotating device. The air flow channel is the only channel between the filament bundle channel and the compressed air channel. The air flow channel is a cylindrical channel, and the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is greater than 0° and less than 90°;

[0011] The air jet rotating device includes a left convex handle, an ellipsoid, and a right convex handle arranged in sequence along the left-right direction. The major axis of the ellipsoid is parallel to the left-right direction, and the air flow channel is located inside the ellipsoid and passes through the center of the ellipsoid;

[0012] The inner surface of the filament bundle channel is jointly composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is smoothly connected in sequence by a line segment a, an arc line, and a line segment b. The bending direction of the arc line is downward, and the unconnected ends of the line segment a and the line segment b are close to each other; the line segment a is the intersection line of the inclined surface a and the cross-section, the arc line is the intersection line of the arc surface and the cross-section, and the line segment b is the intersection line of the inclined surface b and the cross-section;

[0013] The lower edge of the inclined surface a is directly above the junction of the left convex handle and the ellipsoid, and the lower edge of the inclined surface b is directly above the junction of the right convex handle and the ellipsoid;

[0014] The installation method of the air jet rotating device satisfies that when the polyester industrial yarn with a large single filament fineness passes through the filament bundle channel, it contacts the air jet rotating device and drives the air jet rotating device to rotate around the central axis parallel to the left-right direction.

[0015] In order to achieve better texturing of polyester industrial yarns with a large denier per filament, the present invention provides a new texturing device. Through the frictional force of the rapidly passing filament bundle by the jet rotation device, intermittent jet impacts on the filament bundle are realized. While the jet rotation device moves along the movement direction of the filament bundle, it can extend the time for the same point position on the filament bundle to be impacted by compressed air, thereby forming uniform and firm network nodes; when in the non-jet state, the filament bundle returns to the free and loose state, which is more conducive to forming an entangled structure again during compressed air injection. At the same time, the free and loose state of the filament bundle reduces the collision between the continuously high-frequency vibration of the filament bundle and the inner wall of the texturing device, thereby reducing the probability of the appearance of looped yarns; the design of the air flow channel of the jet rotation device makes the direction of the air flow not perpendicular to the filament bundle, but at a certain angle with the horizontal direction. Each time the air flow is ejected, only half of the filament bundle is impacted. For example, the air flow first causes entanglement between the left-side filaments, and at the same time winds the right-side filaments under the entrainment of the air flow. When the jet rotation device rotates 180°, the air flow then causes entanglement between the right-side filaments, and at the same time winds the left-side filaments under the entrainment of the air flow. Through such periodic repeated actions, a better entangled structure can be formed between the filament bundles.

[0016] As Figure 9 shown, after the air flow is ejected from the air flow channel, a velocity gradient distribution that gradually decreases from the axis to both sides is formed; the filament channel is of an umbrella structure. Under the impact of the axis air flow, the filaments near the inclined surface a vibrate at a high frequency and rotate clockwise along the arc surface under the drive of the air flow. When the air flow sends the filaments near the inclined surface a to near the inclined surface b, the two parts of the filaments complete an overall winding; as Figure 10 shown, when the jet rotation device rotates 180°, due to the change in the air flow direction, the filaments near the inclined surface b rotate counterclockwise along the arc surface. When the air flow sends the filaments near the inclined surface b to near the inclined surface a, the two parts of the filaments complete a second overall winding; by repeating this process, under the action of the ejected air flow, while the single filaments are wound, the overall rotation and winding occur. The rotation of the filament bundle forms winding points, and repeated winding forms network points, thereby improving the problem that industrial yarns with a large denier per filament are not easily entangled due to the large rigidity of the single filaments.

[0017] As a preferred technical solution:

[0018] A network device for adding network points to polyester industrial yarns with a large single-filament fineness as described above, the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is 30 - 45°; the diameter of the circle corresponding to the arc line is 6 - 10 mm, and the central angle is 180 - 270°; the included angles between line segment a and line segment b and the left-right direction are the same and the value range is 45 - 60°; the lengths of line segment a and line segment b are the same and the value range is 3 - 5 mm; these parameters cooperate with each other, which is beneficial to the winding of the filament bundle. The specific principle is: the air flow ejected from the air flow channel blows a part of the filament bundle in the areas of line segment a and line segment b, and the blown part of the filament bundle generates high-frequency vibration and moves to the arc surface area of the arc line; in the arc surface area, the air flow drives the filament bundle to rotate along the arc surface direction and moves to the position of the part of the filament bundle that has not been blown. Under the action of the turbulent air flow, the two parts of the filament bundle (the blown part of the filament bundle and the part of the filament bundle that has not been blown) are mixed to form a structure in which one part of the filament bundle winds around the other part of the filament bundle.

[0019] A network device for adding network points to polyester industrial yarns with a large single-filament fineness as described above, the length of the jet rotation device along the left-right direction is 14 - 18 mm, the length of the major axis of the ellipsoid is 8 - 10 mm, the length of the minor axis of the ellipsoid is 5 - 7 mm, the diameter of the air flow channel is 4 - 6 mm, both the left convex handle and the right convex handle are cylindrical structures, the central axes are parallel to the left-right direction and have the same size, and the diameter of the right convex handle is 2 - 3 mm.

[0020] A network device for adding network points to polyester industrial yarns with a large single-filament fineness as described above, the jet rotation device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2 - 2.0 μm.

[0021] A network device for adding network points to polyester industrial yarns with a large single-filament fineness as described above, left and right grooves are provided at the junction of the filament bundle channel and the compressed air channel inside the network device;

[0022] The shape of the left groove is the same as that of the left convex handle, and the left convex handle is embedded in the left groove. The height of the gap between the two along the up-down direction is 0.05 - 0.1 mm;

[0023] The shape of the right groove is the same as that of the right convex handle, and the right convex handle is embedded in the right groove. The height of the gap between the two along the up-down direction is 0.05 - 0.1 mm;

[0024] The surfaces of the left and right grooves are smooth, and the surface roughness Ra value is 0.8 - 1.0 μm.

[0025] A network device for adding network points to polyester industrial yarns with a large single-filament fineness as described above, the extending direction of the compressed air channel is parallel to the up-down direction.

[0026] A jetting device for adding network points to polyester industrial yarns with a large single filament fineness as described above, the lower curved surface arches upward in the front-rear direction and arches downward in the left-right direction. Such a design is conducive to the effective contact between the yarn bundle and the jetting rotating device, driving the jetting rotating device to rotate. The maximum height of the yarn bundle channel in the up-down direction is 6 - 8 mm, and the minimum height is 5 - 7 mm; the length of the yarn bundle channel in the front-rear direction is 35 - 45 mm; the jetting device is divided into an upper cover layer, an intermediate layer, and a main body layer arranged in sequence from top to bottom. The yarn bundle channel is arranged in the intermediate layer, and the compressed air channel is arranged in the main body layer; the intermediate layer is a detachable structure.

[0027] The present invention also provides a method for adding network points to polyester industrial yarns with a large single filament fineness. Using a jetting device for adding network points to polyester industrial yarns with a large single filament fineness as described in any one of the above, the polyester industrial yarns with a large single filament fineness are passed through the yarn bundle channel, and compressed air is continuously introduced into the compressed air channel. Among them, the single filament fineness of the polyester industrial yarns with a large single filament fineness is 15 - 40 dtex, and the multifilament fineness is 550 - 2000 dtex.

[0028] As a preferred technical solution:

[0029] For the method for adding network points to polyester industrial yarns with a large single filament fineness as described above, the winding speed is 2600 - 3000 m / min, the winding tension is 90 - 380 cN, the network pressure is 4.0 - 4.5 bar. After the polyester industrial yarns with a large single filament fineness leave the yarn bundle channel, the network density is 10 - 20 pieces / m, and the number of coiled yarns is 0.0005 - 0.001 pieces / m.

[0030] Beneficial effects:

[0031] (1) The jetting device of the present invention is provided with a jetting rotating device at the front end of the compressed air channel, so that the jetting device jets air flow periodically at a high frequency under the action of the running force of the yarn bundle. And as the jetting rotating device rotates, the time for the same point position on the yarn bundle to be impacted by the air flow is extended, thereby forming a firm winding structure and network points; the inclined air flow channel makes the air flow direction not perpendicular to the yarn bundle, but the air flow direction forms a certain angle with the horizontal direction. Each time the air flow is jetted, only half of the yarn bundle is impacted, and the periodic repeated action makes a better entanglement structure formed between the yarn bundles, so that the industrial yarns with a large single filament fineness generate a winding structure; at the same time, the yarn bundle channel is in an umbrella shape. Under the action of the jetted air flow, while the single filaments are wound, the whole yarn bundle rotates and winds. The rotation of the yarn bundle forms winding points, and repeated winding forms network points, thereby improving the problem that the industrial yarns with a large single filament fineness are difficult to generate a winding structure due to the large rigidity of the single filaments.

[0032] (2) When the jetting rotating device of the jetting device of the present invention is closed, it avoids the problem of looped yarns generated by the continuous jetting of compressed air causing the yarn bundle to impact the inner wall of the jetting device, which is beneficial to avoiding fiber damage to the yarn bundle.

[0033] (3) The air distributor of the present invention uses intermittent injection of compressed air, saving compressed air, facilitating energy consumption reduction and cost reduction, and being suitable for large-scale applications. Description of the Drawings

[0034] Figure 1 is a perspective structural view of the air distributor of the present invention, wherein the X-axis direction is the left-right direction, the Y-axis direction is the front-back direction, and the Z-axis direction is the up-down direction;

[0035] Figure 2 is Figure 1 the A-A sectional view of

[0036] Figure 3 is a top view of the main body layer of the air distributor of the present invention;

[0037] Figure 4 is a front structural view of the air jet rotating device of the air distributor of the present invention;

[0038] Figure 5 is a side structural view of the air jet rotating device of the air distributor of the present invention;

[0039] Figure 6 is a schematic view of the position of the air flow channel of the air distributor of the present invention at the position where air jetting is about to start;

[0040] Figure 7 is a schematic view of the position of the air flow channel of the air distributor of the present invention when it is fully opened;

[0041] Figure 8 is a schematic view of the position of the air flow channel of the air distributor of the present invention at the end of air jetting;

[0042] Figure 9 is a schematic view of the air flow of the air jet rotating device of the air distributor of the present invention during air jetting;

[0043] Figure 10 is Figure 9 the schematic view of the air flow after the air jet rotating device shown rotates 180°;

[0044] Among them, 11 is the main body layer, 12 is the compressed air channel, 14 is the air jet rotating device, 21 is the non-removable plate, 22 is the tow channel, 23 is the tow inlet, 31 is the upper cover layer, 41 is the removable plate, 51 is the ellipsoid, 52 is the right convex handle, 53 is the air flow channel, 531 is the first port, 532 is the second port, 56 is the air flow, 57 is the inclined surface a, 58 is the inclined surface b, 59 is the arc surface, 61 is the tow, L1 is the length of the air jet rotating device in the left-right direction, L2 is the major axis length of the ellipsoid, L3 is the minor axis length of the ellipsoid, and L4 is the diameter of the right convex handle. Detailed Embodiments

[0045] 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 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.

[0046] The following are the test methods for relevant performance indicators in each embodiment and comparative example:

[0047] Network degree: The network degree is tested by the manual needle transfer method according to the standard of FZ / T 50001-2016: Measure a 1-meter-long tow, fix one end of the tow, start from the fixed end, pierce the center of the tow with a needle and slide down. When there is entanglement and resistance in the tow, it is regarded as a network point. Then start operating in the same way from below the entanglement until the 1-meter-long tow is tested. Count the number of network points; each tow is tested twice, and the average value of the number of network points in the two tests is taken as the network degree, unit: pieces / meter.

[0048] Number of looped filaments: Detected by the YIS 200 hairiness detector. Using the principle of image method, when the tow continuously passes through the viewing mirror detection area, the viewing mirror continuously collects two-dimensional information of the tow and hairiness, and performs digital processing on the collected image to identify and extract the hairiness on the tow; according to the processed image, the operator counts the number of looped filaments by viewing and analyzing the tow morphology; the length of the tow for a single test is 10,000 meters, the running speed of the tow is 400 m / min, and counting is performed when the distance sensitivity is set greater than 1500 µm.

[0049] Number of intermittent jet compressed air and jet intensity: Detect the number of intermittent jet compressed air and jet intensity by setting a pressure sensor on the inner wall of the tow channel perpendicular to the compressed air channel. When the pressure of the compressed air acts on the sensor, the sensitive element metal strain gauge inside it deforms, and this deformation further causes a change in the inductance parameter. Convert these pressure changes into measurable electrical signals and output them, forming a periodic fluctuation image with time as the abscissa and intensity as the ordinate on the central control display. The peak of the fluctuation image is the jet intensity of the compressed air, and the number of peaks in one minute is the number of intermittent jet compressed air; in addition, a pressure gauge is set on the compressed air channel, and the compressed air pressure of the compressed air channel is consistent with the jet intensity of the networker. By checking the display data of the pressure gauge, it can be judged whether the jet intensity is stable.

[0050] Surface roughness Ra value: The surface roughness Ra value is detected by the stylus method, that is, a diamond stylus is gently drawn across the surfaces of the air jet rotating device and the air jet rotating device placement area. When the stylus slides, the surface roughness causes the stylus to move up and down. This displacement changes the inductance of the inductor coil of the sensor, thereby generating an analog signal proportional to the surface roughness at the output end of the phase-sensitive rectifier. After amplification and level conversion, this signal enters the data acquisition system. The DSP chip filters the collected data and calculates the parameters, and finally obtains the Ra value.

[0051] Example 1

[0052] An air-jet device for a polyester industrial yarn with a large single-filament fineness to add network points, as Figures 1 - 3 shown. The air-jet device consists of an upper cover layer 31, an intermediate layer, and a main body layer 11 arranged in sequence from top to bottom. The intermediate layer consists of a non-removable plate 21 and a removable plate 41. A filament channel 22 is arranged inside the intermediate layer. The extending direction of the filament channel 22 is parallel to the front-back direction. A compressed air channel 12 is arranged inside the main body layer 11. The compressed air channel 12 is located below the filament channel 22. The extending direction of the compressed air channel 12 is parallel to the up-down direction. An air jet rotating device 14 is installed at the junction of the filament channel 22 and the compressed air channel 12;

[0053] As Figures 4 - 5 shown, the air jet rotating device 14 consists of a left convex handle, an elliptical sphere 51, and a right convex handle 52 arranged in sequence along the left-right direction. The major axis of the elliptical sphere 51 is parallel to the left-right direction. An air flow channel 53 is arranged inside the air jet rotating device 14. The air flow channel 53 is a cylindrical channel. The two ports of the air flow channel 53 are respectively a first port 531 and a second port 532. The air flow channel 53 passes through the center of the elliptical sphere 51. The air flow channel 53 is the only channel between the filament channel 22 and the compressed air channel 12. The central axis of the air flow channel 53 forms an angle of 30° with the major axis of the elliptical sphere 51;

[0054] As Figures 8 - 9 shown, the inner surface of the filament channel 22 is jointly composed of an upper curved surface and a lower curved surface. The upper curved surface is composed of an inclined plane a 57, an arc surface 59, and an inclined plane b 58; The front edge or the rear edge of the upper curved surface is smoothly connected in sequence by a line segment a, an arc line, and a line segment b. The bending direction of the arc line is downward. The unconnected ends of the line segment a and the line segment b are close to each other; The line segment a is the intersection line of the inclined plane a 57 and the cross-section. The arc line is the intersection line of the arc surface 59 and the cross-section. The line segment b is the intersection line of the inclined plane b 58 and the cross-section; The lower edge of the inclined plane a 57 is directly above the junction of the left convex handle and the elliptical sphere 51. The lower edge of the inclined plane b 58 is directly above the junction of the right convex handle 52 and the elliptical sphere 51; The lower curved surface arches upward along the front-back direction and arches downward along the left-right direction;

[0055] The length of the tow channel 22 in the front-back direction is 40 mm; the maximum height of the tow channel 22 in the up-down direction is 7 mm, and the minimum height is 6 mm; the diameter of the circle corresponding to the arc line is 8 mm, the central angle is 240°, the angles between the line segment a and the line segment b and the left-right direction are the same and the value is 52°, and the lengths of the line segment a and the line segment b are the same and the value is 4 mm;

[0056] The length of the jet rotating device 14 in the left-right direction is 16 mm, the major axis length of the ellipsoid 51 is 9 mm, the minor axis length of the ellipsoid 51 is 6 mm, the diameter of the air flow channel 53 is 5 mm, both the left convex handle and the right convex handle 52 are cylindrical structures, the central axes are parallel to the left-right direction and have the same dimensions, and the diameter of the right convex handle 52 is 2 mm; the jet rotating device 14 is a smooth ceramic part, and the surface roughness Ra value is 1.6 ± 0.4 μm;

[0057] As Figure 3 shown, at the junction of the tow channel 22 and the compressed air channel 12, there are a left groove and a right groove, and the surfaces of the left groove and the right groove are treated smoothly, and the surface roughness Ra value is 0.9 ± 0.1 μm;

[0058] The shape of the left groove is the same as the whole formed by the left convex handle and the left end of the ellipsoid 51. The whole formed by the left convex handle and the left end of the ellipsoid 51 is embedded in the left groove, and the height of the gap between the two in the up-down direction is 0.08 ± 0.01 mm;

[0059] The shape of the right groove is the same as the whole formed by the right convex handle 52 and the right end of the ellipsoid 51. The whole formed by the right convex handle 52 and the right end of the ellipsoid 51 is embedded in the right groove, and the height of the gap between the two in the up-down direction is 0.08 ± 0.01 mm;

[0060] During installation, after placing the jet rotating device 14 in the jet rotating device placement area, cover the detachable plate 41, the non-detachable plate 21 and the upper cover layer 31, and use fixing screws to lock the three layers of the main body layer 11, the non-detachable plate 21 and the upper cover layer 31. The detachable plate 41 is located above the main body layer 11, and the two layers of the detachable plate 41 and the main body layer 11 are also locked with fixing screws. There is a gap between the non-detachable plate 21 and the detachable plate 41, and this gap is the tow inlet 23, and the tow inlet 23 is communicated with the tow channel 22; the installation method of the jet rotating device 14 satisfies that when the tow 61 passes through the tow channel 22, it contacts the jet rotating device 14 and drives the jet rotating device 14 to rotate around the central axis parallel to the left-right direction. When the jet rotating device 14 rotates to Figure 6 the position shown, the air flow channel 53 is about to start jetting compressed air; when the jet rotating device 14 rotates to Figure 7 the position shown, the air flow channel 53 is fully opened; when the jet rotating device 14 rotates to Figure 8When in the shown position, the air flow channel 53 is closed, enabling the jet rotation device 14 to dynamically open and close the air flow channel. As the jet rotation device 14 rotates, the air flow 56 in the tow channel 22 changes as Figures 9 - 10 shown.

[0061] Embodiment 2

[0062] An air entangler for use in adding air entangling points to polyester industrial yarns with a large single filament fineness, as Figures 1 - 3 shown. The air entangler is composed of an upper cover layer 31, an intermediate layer, and a main body layer 11 arranged in sequence from top to bottom. The intermediate layer is composed of a non-removable plate 21 and a removable plate 41. A tow channel 22 is provided in the intermediate layer. The extending direction of the tow channel 22 is parallel to the front-back direction. A compressed air channel 12 is provided in the main body layer 11. The compressed air channel 12 is located below the tow channel 22. The extending direction of the compressed air channel 12 is parallel to the up-down direction. A jet rotation device 14 is installed at the junction of the tow channel 22 and the compressed air channel 12;

[0063] As Figures 4 - 5 shown, the jet rotation device 14 is composed of a left convex handle, an elliptical ball 51, and a right convex handle 52 arranged in sequence along the left-right direction. The major axis of the elliptical ball 51 is parallel to the left-right direction. An air flow channel 53 is provided in the jet rotation device 14. The air flow channel 53 is a cylindrical channel. The two ports of the air flow channel 53 are respectively a first port 531 and a second port 532. The air flow channel 53 passes through the center of the elliptical ball 51. The air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12. The central axis of the air flow channel 53 forms an angle of 45° with the major axis of the elliptical ball 51;

[0064] As Figures 8 - 9 shown, the inner surface of the tow channel 22 is jointly composed of an upper curved surface and a lower curved surface. The upper curved surface is composed of an inclined surface a 57, an arc surface 59, and an inclined surface b 58; The front edge or the rear edge of the upper curved surface is smoothly connected in sequence by a line segment a, an arc line, and a line segment b. The bending direction of the arc line is downward. The unconnected ends of the line segment a and the line segment b are close to each other; The line segment a is the intersection line of the inclined surface a 57 and the cross-section. The arc line is the intersection line of the arc surface 59 and the cross-section. The line segment b is the intersection line of the inclined surface b 58 and the cross-section; The lower edge of the inclined surface a 57 is directly above the junction of the left convex handle and the elliptical ball 51. The lower edge of the inclined surface b 58 is directly above the junction of the right convex handle 52 and the elliptical ball 51; The lower curved surface arches upward along the front-back direction and arches downward along the left-right direction;

[0065] The length of the tow channel 22 in the front-back direction is 45 mm; the maximum height of the tow channel 22 in the up-down direction is 8 mm, and the minimum height is 7 mm; the diameter of the circle corresponding to the arc line is 10 mm, the central angle is 270°, the angles between the line segment a and the line segment b and the left-right direction are the same and the value is 45°, and the lengths of the line segment a and the line segment b are the same and the value is 5 mm;

[0066] The length of the jet rotating device 14 in the left-right direction is 18 mm, the major axis length of the ellipsoid 51 is 10 mm, the minor axis length of the ellipsoid 51 is 7 mm, the diameter of the air flow channel 53 is 6 mm, both the left convex handle and the right convex handle 52 are cylindrical structures, the central axes are parallel to the left-right direction and have the same dimensions, and the diameter of the right convex handle 52 is 3 mm; the jet rotating device 14 is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.6 ± 0.4 μm;

[0067] As Figure 3 shown, at the junction of the tow channel 22 and the compressed air channel 12, there are a left groove and a right groove, and the surfaces of the left groove and the right groove are treated smoothly, and the surface roughness Ra value is 0.9 ± 0.1 μm;

[0068] The shape of the left groove is the same as the whole formed by the left convex handle and the left end of the ellipsoid 51, the whole formed by the left convex handle and the left end of the ellipsoid 51 is embedded in the left groove, and the height of the gap between the two in the up-down direction is 0.1 ± 0.01 mm;

[0069] The shape of the right groove is the same as the whole formed by the right convex handle 52 and the right end of the ellipsoid 51, the whole formed by the right convex handle 52 and the right end of the ellipsoid 51 is embedded in the right groove, and the height of the gap between the two in the up-down direction is 0.1 ± 0.01 mm;

[0070] During installation, after placing the jet rotating device 14 in the jet rotating device placement area, cover the detachable plate 41, the non-detachable plate 21 and the upper cover layer 31, and use fixing screws to lock the three layers of the main body layer 11, the non-detachable plate 21 and the upper cover layer 31. The detachable plate 41 is located above the main body layer 11, and the two layers of the detachable plate 41 and the main body layer 11 are also locked with fixing screws. There is a gap between the non-detachable plate 21 and the detachable plate 41, and this gap is the tow inlet 23, and the tow inlet 23 is communicated with the tow channel 22; the installation method of the jet rotating device 14 satisfies that when the tow 61 passes through the tow channel 22, it contacts the jet rotating device 14 and drives the jet rotating device 14 to rotate around the central axis parallel to the left-right direction. When the jet rotating device 14 rotates to Figure 6 the position shown, the air flow channel 53 is about to start jetting compressed air; when the jet rotating device 14 rotates to Figure 7 the position shown, the air flow channel 53 is fully opened; when the jet rotating device 14 rotates to Figure 8When in the shown position, the air flow channel 53 is closed, realizing the dynamic opening and closing of the air flow channel by the jet rotation device 14. As the jet rotation device 14 rotates, the air flow 56 in the tow channel 22 changes as Figures 9 - 10 shown.

[0071] Embodiment 3

[0072] An air entangler for a polyester industrial yarn with a large single filament fineness to form air entanglement points, as Figures 1 - 3 shown. The air entangler is composed of an upper cover layer 31, an intermediate layer, and a main body layer 11 arranged in sequence from top to bottom. The intermediate layer is composed of a non-removable plate 21 and a removable plate 41. A tow channel 22 is arranged in the intermediate layer. The extending direction of the tow channel 22 is parallel to the front-rear direction. An air pressure channel 12 is arranged in the main body layer 11. The air pressure channel 12 is located below the tow channel 22. The extending direction of the air pressure channel 12 is parallel to the up-down direction. A jet rotation device 14 is installed at the junction of the tow channel 22 and the air pressure channel 12;

[0073] As Figures 4 - 5 shown, the jet rotation device 14 is composed of a left convex handle, an elliptical sphere 51, and a right convex handle 52 arranged in sequence along the left-right direction. The major axis of the elliptical sphere 51 is parallel to the left-right direction. An air flow channel 53 is arranged in the jet rotation device 14. The air flow channel 53 is a cylindrical channel. The two ports of the air flow channel 53 are respectively a first port 531 and a second port 532. The air flow channel 53 passes through the center of the elliptical sphere 51. The air flow channel 53 is the only channel between the tow channel 22 and the air pressure channel 12. The included angle between the central axis of the air flow channel 53 and the major axis of the elliptical sphere 51 is 37°;

[0074] As Figures 8 - 9 shown, the inner surface of the tow channel 22 is jointly composed of an upper curved surface and a lower curved surface. The upper curved surface is composed of an inclined surface a 57, an arc surface 59, and an inclined surface b 58; the front edge or the rear edge of the upper curved surface is smoothly connected in sequence by a line segment a, an arc line, and a line segment b. The bending direction of the arc line is downward. The unconnected ends of the line segment a and the line segment b are close to each other; the line segment a is the intersection line of the inclined surface a 57 and the cross-section, the arc line is the intersection line of the arc surface 59 and the cross-section, and the line segment b is the intersection line of the inclined surface b 58 and the cross-section; the lower edge of the inclined surface a 57 is directly above the junction of the left convex handle and the elliptical sphere 51, and the lower edge of the inclined surface b 58 is directly above the junction of the right convex handle 52 and the elliptical sphere 51; the lower curved surface arches upward along the front-rear direction and arches downward along the left-right direction;

[0075] The length of the tow channel 22 in the front-rear direction is 35 mm; the maximum height of the tow channel 22 in the up-down direction is 6 mm, and the minimum height is 5 mm; the diameter of the circle corresponding to the arc line is 6 mm, the central angle is 180°, the angles between the line segment a and the line segment b and the left-right direction are the same and the value is 60°, and the lengths of the line segment a and the line segment b are the same and the value is 3 mm;

[0076] The length of the jet rotating device 14 in the left-right direction is 14 mm, the major axis length of the ellipsoid 51 is 8 mm, the minor axis length of the ellipsoid 51 is 5 mm, the diameter of the air flow channel 53 is 4 mm, both the left convex handle and the right convex handle 52 are cylindrical structures, the central axes are parallel to the left-right direction and have the same dimensions, and the diameter of the right convex handle 52 is 2 mm; the jet rotating device 14 is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.6 ± 0.4 μm;

[0077] As Figure 3 shown, at the junction of the tow channel 22 and the compressed air channel 12, there are a left groove and a right groove. The surfaces of the left groove and the right groove are treated smoothly, and the surface roughness Ra value is 0.9 ± 0.1 μm;

[0078] The shape of the left groove is the same as the whole formed by the left convex handle and the left end of the ellipsoid 51. The whole formed by the left convex handle and the left end of the ellipsoid 51 is embedded in the left groove, and the height of the gap between the two in the up-down direction is 0.05 ± 0.01 mm;

[0079] The shape of the right groove is the same as the whole formed by the right convex handle 52 and the right end of the ellipsoid 51. The whole formed by the right convex handle 52 and the right end of the ellipsoid 51 is embedded in the right groove, and the height of the gap between the two in the up-down direction is 0.05 ± 0.01 mm;

[0080] During installation, after placing the jet rotating device 14 in the jet rotating device placement area, cover the detachable plate 41, the non-detachable plate 21 and the upper cover layer 31, and use fixing screws to lock the three layers of the main body layer 11, the non-detachable plate 21 and the upper cover layer 31. The detachable plate 41 is located above the main body layer 11, and the two layers of the detachable plate 41 and the main body layer 11 are also locked with fixing screws. There is a gap between the non-detachable plate 21 and the detachable plate 41, and this gap is the tow inlet 23. The tow inlet 23 is communicated with the tow channel 22; the installation method of the jet rotating device 14 satisfies that when the tow 61 passes through the tow channel 22, it contacts the jet rotating device 14 and drives the jet rotating device 14 to rotate around the central axis parallel to the left-right direction. When the jet rotating device 14 rotates to Figure 6 the position shown, the air flow channel 53 is about to start jetting compressed air; when the jet rotating device 14 rotates to Figure 7 the position shown, the air flow channel 53 is fully opened; when the jet rotating device 14 rotates to Figure 8When in the shown position, the air flow channel 53 is closed, enabling the jet rotation device 14 to dynamically open and close the air flow channel. As the jet rotation device 14 rotates, the air flow 56 in the tow channel 22 changes as Figures 9 - 10 shown.

[0081] Example 4

[0082] A method for texturing a polyester industrial yarn with a large single filament fineness uses the texturing device provided in Example 1. The polyester industrial yarn with a large single filament fineness is passed through the tow channel, and compressed air is continuously introduced into the compressed air channel. Among them, the single filament fineness of the polyester industrial yarn with a large single filament fineness is 30 dtex, the multifilament fineness is 1000 dtex, the winding speed is 3000 m / min, the winding tension is 220 cN, and the texturing pressure is 4.3 bar.

[0083] After the polyester industrial yarn with a large single filament fineness leaves the tow channel, the texturing degree is 15 per meter, and the number of coiled filaments is 0.0008 per meter.

[0084] Example 5

[0085] A method for texturing a polyester industrial yarn with a large single filament fineness uses the texturing device provided in Example 2. The polyester industrial yarn with a large single filament fineness is passed through the tow channel, and compressed air is continuously introduced into the compressed air channel. Among them, the single filament fineness of the polyester industrial yarn with a large single filament fineness is 40 dtex, the multifilament fineness is 2000 dtex, the winding speed is 2600 m / min, the winding tension is 380 cN, and the texturing pressure is 4.0 bar.

[0086] After the polyester industrial yarn with a large single filament fineness leaves the tow channel, the texturing degree is 10 per meter, and the number of coiled filaments is 0.001 per meter.

[0087] Example 6

[0088] A method for texturing a polyester industrial yarn with a large single filament fineness uses the texturing device provided in Example 3. The polyester industrial yarn with a large single filament fineness is passed through the tow channel, and compressed air is continuously introduced into the compressed air channel. Among them, the single filament fineness of the polyester industrial yarn with a large single filament fineness is 15 dtex, the multifilament fineness is 550 dtex, the winding speed is 2750 m / min, the winding tension is 90 cN, and the texturing pressure is 4.5 bar.

[0089] After the polyester industrial yarn with a large single filament fineness leaves the tow channel, the texturing degree is 20 per meter, and the number of coiled filaments is 0.0005 per meter.

[0090] Comparative Example 1

[0091] A method for adding network points to a polyester industrial yarn with a large single filament fineness is basically the same as that in Example 4, except that: in the used network device, the air flow channel is a cylindrical channel, and the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is 90°.

[0092] After the tow leaves the tow channel, the network degree is 4 per meter, and the number of coiled filaments is 0.002 per meter.

[0093] Comparative Example 2

[0094] A method for adding network points to a polyester industrial yarn with a large single filament fineness is basically the same as that in Example 5, except that: in the used network device, the air flow channel is a cylindrical channel, and the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is 90°.

[0095] After the tow leaves the tow channel, the network degree is 6 per meter, and the number of coiled filaments is 0.002 per meter.

[0096] Comparative Example 3

[0097] A method for adding network points to a polyester industrial yarn with a large single filament fineness is basically the same as that in Example 6, except that: in the used network device, the air flow channel is a cylindrical channel, and the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is 90°.

[0098] After the tow leaves the tow channel, the network degree is 6 per meter, and the number of coiled filaments is 0.004 per meter.

[0099] Comparative Example 4

[0100] A method for adding network points to a polyester industrial yarn with a large single filament fineness is basically the same as that in Example 4, except that: in the used network device, the width of the tow channel in the left - right direction is the same.

[0101] After the tow leaves the tow channel, the network degree is 6 per meter, and the number of coiled filaments is 0.002 per meter.

[0102] Comparative Example 5

[0103] A method for adding network points to a polyester industrial yarn with a large single filament fineness is basically the same as that in Example 5, except that: in the used network device, the width of the tow channel in the left - right direction is the same.

[0104] After the tow leaves the tow channel, the network degree is 8 per meter, and the number of coiled filaments is 0.002 per meter.

[0105] Comparative Example 6

[0106] A method for adding network points to a polyester industrial yarn with a large single filament fineness is basically the same as that in Example 6, except that: in the used network device, the width of the tow channel in the left - right direction is the same.

[0107] After the tow leaves the tow channel, the entanglement degree is 6 per meter, and the number of coiled filaments is 0.003 per meter.

[0108] After comparison, the entanglement degree of the tows obtained in Examples 4-6 is 10-20 per meter, and the number of coiled filaments is 0.0005-0.001 per meter. The entanglement degree of the tows obtained in Comparative Examples 1-3 is 4-6 per meter, and the number of coiled filaments is 0.002-0.004 per meter. The entanglement degree of the tows obtained in Comparative Examples 4-6 is 6-8 per meter, and the number of coiled filaments is 0.002-0.003 per meter. Compared with Comparative Examples 1-3 and Comparative Examples 4-6, the entanglement degree of the tows obtained in Examples 4-6 is significantly increased, and the number of coiled filaments is significantly decreased.

[0109] This shows that: the air flow channel of the entangler of the present invention is a cylindrical channel, the included angle between the central axis of the air flow channel and the major axis of the ellipsoid is greater than 0° and less than 90°, the air flow channel is in an inclined state, and at the same time, the inner surface of the tow channel is jointly composed of an upper curved surface and a lower curved surface. The upper curved surface is composed of inclined surface a, arc surface, and inclined surface b. The tow channel is of an umbrella type structure; the inclined air flow channel and the umbrella type tow channel play a synergistic role, thereby increasing the entanglement degree of the polyester industrial yarn with a large single filament fineness and reducing the number of coiled filaments. This is because:

[0110] The inclined air flow channel makes the direction of the air flow not perpendicular to the tow, but at a certain angle with the horizontal direction. Each time the air flow is ejected, only half of the tow is impacted. For example, the air flow first causes entanglement between the left-side tows, and at the same time winds the right-side tows under the entrainment of the air flow. When the air jet rotating device rotates 180°, the air flow then causes entanglement between the right-side tows, and at the same time winds the left-side tows under the entrainment of the air flow. Such periodic repeated actions are conducive to the formation of an entanglement structure between the tows;

[0111] At the same time, after the air flow is ejected from the inclined air flow channel, a velocity gradient distribution that gradually decreases from the axis to both sides is formed, as Figure 9 shown; the tow channel is of an umbrella type structure. When the tow is impacted by the central axis air flow, the tows close to the inclined surface a vibrate at a high frequency and rotate clockwise along the arc surface under the drive of the air flow. When the air flow sends the tows close to the inclined surface a to the vicinity of the inclined surface b, the two parts of the tows complete an overall winding; as Figure 10As shown in the figure, when the jet rotating device rotates 180°, due to the change in the air flow direction, the tow near the inclined plane b rotates counterclockwise along the arc surface. When the air flow sends the tow near the inclined plane b to the vicinity of the inclined plane a, the two parts of the tow complete the secondary overall winding; this process is repeated. Under the action of the jet air flow, the two parts of the tow rotate and wind as a whole while the single filaments are winding. The rotation of the tow forms winding points, and the repeated winding forms network points, thus improving the problem that industrial yarns with a large single filament fineness are difficult to form a winding structure due to the large rigidity of the single filaments.

Claims

1. A networker used for network points of polyester industrial yarn with large single-filament fineness, with a tow channel and a compressed air channel inside, the extension direction of the tow channel is parallel to the front-back direction, and the compressed air channel is located below the tow channel, characterized in that: There is also a jet rotating device inside; The jet rotating device is installed at the junction of the tow channel and the compressed air channel; An air flow channel is provided in the jet rotating device, the air flow channel is the only channel between the tow channel and the compressed air channel, the air flow channel is a cylindrical channel, and the angle between the central axis of the air flow channel and the major axis of the ellipsoid is greater than 0° and less than 90°; The jet rotating device comprises a left convex handle, an elliptical ball, and a right convex handle which are sequentially arranged in the left-right direction, the long axis of the elliptical ball is parallel to the left-right direction, and the air flow channel is located in the elliptical ball and passes through the center of the elliptical ball; The inner surface of the tow channel is composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by a line segment a, an arc line, and a line segment b being connected in sequence by smooth transition, the arc line is bent downward, and the ends of the line segments a and b that are not connected to the arc line are close to each other; the line segment a is the intersection line of the inclined surface a and the cross section, the arc line is the intersection line of the arc surface and the cross section, and the line segment b is the intersection line of the inclined surface b and the cross section; The lower edge of the inclined surface a is located directly above the junction of the left convex handle and the ellipsoid, and the lower edge of the inclined surface b is located directly above the junction of the right convex handle and the ellipsoid; The installation method of the jet rotating device satisfies that: when the polyester industrial yarn with large single-filament fineness passes through the tow channel, it contacts the jet rotating device and drives the jet rotating device to rotate around a central axis parallel to the left and right directions.

2. The network device for use in network points for polyester industrial yarn with large single-filament fineness according to claim 1, characterized in that: The angle between the central axis of the airflow channel and the major axis of the ellipsoid is 30-45°; the diameter of the circle corresponding to the arc line is 6-10 mm, and the central angle is 180-270°; the angles between line segment a and line segment b and the left and right directions are the same and range from 45-60°; the lengths of line segment a and line segment b are the same and range from 3-5 mm.

3. The network device for use in network points for polyester industrial yarn with large single-filament fineness according to claim 1, characterized in that: The length of the jet rotating device along the left and right direction is 14-18mm, the major axis length of the ellipsoid is 8-10mm, the minor axis length of the ellipsoid is 5-7mm, the diameter of the airflow channel is 4-6mm, the left and right lugs are both cylindrical structures, the central axes are parallel to the left and right directions and the size is the same, and the diameter of the right lug is 2-3mm.

4. The network device for use in network points for polyester industrial yarn with large single-filament fineness according to claim 1, characterized in that: The jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2-2.0μm.

5. The networker used for network points of polyester industrial yarn with large single-filament fineness according to claim 1, characterized in that: A left groove and a right groove are provided at the junction of the tow channel and the compressed air channel inside the network device; The shape of the left groove is the same as that of the left convex handle, and the left convex handle is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm; The shape of the right groove is the same as that of the right convex handle, and the right convex handle is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm; The surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8-1.0 μm.

6. The networker for use in network points for polyester industrial yarn with large single-filament fineness according to claim 1, characterized in that: The extension direction of the compressed air channel is parallel to the up-down direction.

7. The network device for use in network points for polyester industrial yarn with large single-filament fineness according to claim 1, characterized in that: The lower curved surface is arched upward along the front-to-back direction and downward along the left-to-right direction. The maximum height of the tow channel along the up-down direction is 6-8mm, and the minimum height is 5-7mm. The length of the tow channel along the front-to-back direction is 35-45mm. The network device is divided into an upper cover layer, a middle layer, and a main body layer arranged in sequence from top to bottom. The tow channel is arranged in the middle layer, and the compressed air channel is arranged in the main body layer. The middle layer is a detachable structure.

8. A method for making a network dot on polyester industrial yarn with large single yarn fineness, characterized in that: A network device for making network points of polyester industrial yarn with large single filament fineness as described in any one of claims 1 to 7 is used to pass the polyester industrial yarn with large single filament fineness through the yarn bundle channel, and compressed air is continuously introduced into the compressed air channel, wherein the single filament fineness of the polyester industrial yarn with large single filament fineness is 15-40dtex, and the multifilament fineness is 550-2000dtex.

9. The method for making interlaced dots of polyester industrial yarn with large single yarn fineness according to claim 8, characterized in that: The winding speed is 2600-3000m / min, the winding tension is 90-380cN, the network pressure is 4.0-4.5bar, and after the polyester industrial yarn with large single filament fineness leaves the tow channel, the network density is 10-20 pieces / meter, and the number of loops is 0.0005-0.001 pieces / meter.

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