Method for dotting network points on polyester industrial yarn with large filament number and used network device

Abstract

The invention belongs to the technical field of spinning, and relates to a method for dotting network points on polyester industrial yarn with large filament number and a used network device. The invention relates to an interlacer for dotting interlacing points of polyester industrial yarns with large filament number. A tow channel, a compressed air channel and an air injection rotating device are arranged in the interlacer; an air flow channel is formed in the air injection 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 included angle between the center axis of the air flow channel and the long axis of the ellipsoid is larger than 0 degree and smaller than 90 degrees; the inner surface of the tow channel consists of an upper curved surface and a lower curved surface; the upper curved surface consists of an inclined surface a, an arc surface and an inclined surface b; according to the method for dotting the interlaced points on the polyester industrial yarn with the large filament number, the polyester industrial yarn with the large filament number penetrates through the tow channel of the interlacing device, and compressed air is continuously introduced into the compressed air channel. The interlacing device and the interlacing method can improve the interlacing degree of the polyester industrial yarn with large filament number.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a method for making interlacing dots for polyester industrial yarn with large single yarn fineness and a interlacing device used therein. Background Art

[0002] Polyester industrial yarn is a high-performance material widely used in many fields such as automobile tires, fire belts, pipeline skeletons, hoisting ropes and nets, canvas, etc. It has various types and specifications to meet the needs of different application scenarios. The production of coarse denier polyester industrial yarn requires the single yarn to be twisted first, and then networked through a network device to finally form a tow with a certain network point and network degree. The networked tow has stable, uniform, and dense network points, and the tow has good cohesion, does not diverge during the weaving process, and runs stably. Therefore, studying the networking method of polyester industrial yarn has important application value.

[0003] At present, the fineness of polyester industrial yarn produced by one-step method is between 80-8800dtex, the number of strands in a bundle is between 48-976, and the maximum fineness of a single yarn can be about 20dtex according to customer needs, for example, the fineness of a single yarn of 1690dtex / 96f is 17.6dtex, and the fineness of a single yarn of 560dtex / 28f is 20dtex. During the networking, if the conventional main network nozzle is used to continuously spray vertical airflow to impact the polyester fiber passing through the network device, due to the large fineness of the single yarn and the high rigidity of the single yarn, the vibration of the yarn bundle in the network device is difficult to produce an entangled structure, and the yarn bundle is difficult to form a uniform and firm network structure.

[0004] To overcome this defect, the prior art has been studied. For example, patent CN209537712U provides a winding device capable of improving the network degree of coarse denier yarn, including a first support seat, a second support seat, a third support seat, a first drive motor, a second drive motor, an oil tanker, 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 coarse denier yarn is networked for the first time through the main network device, and then the coarse denier yarn is networked for the second time through the spare network device, without increasing the network pressure, thereby avoiding the breakage of the yarn bundle due to excessive shaking. However, since the industrial yarn with large single-filament fineness has high hardness of the yarn bundle, it is difficult to produce a winding structure in high-frequency vibration. The winding device using this double network device is still difficult to improve the winding structure and network degree of the industrial yarn with large single-filament fineness. At the same time, the compressed air flow consumed by the double network device is doubled, which is not conducive to saving compressed air.

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

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to provide a method for making interlacing dots on polyester industrial yarn with large single yarn fineness and a interlacing device used therein.

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

[0008] A netting device for netting polyester industrial yarn with large single yarn fineness, with a yarn bundle channel and a compressed air channel inside, the extension direction of the yarn bundle channel is parallel to the front-back direction, the compressed air channel is located below the yarn bundle channel, and an air jet rotating device is also provided inside;

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

[0010] 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°;

[0011] 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;

[0012] 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;

[0013] 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;

[0014] 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.

[0015] In order to achieve better interlacing of polyester industrial yarn with large single yarn fineness, the present invention provides a new interlacing device. The jet rotating device realizes intermittent jet impact on the filament bundle under the action of the friction force of the fast passing filament bundle. The jet rotating device moves with the moving direction of the filament bundle, and can prolong the time that the same point position on the filament bundle is impacted by compressed air, thereby forming a uniform and firm network node; when there is no jet, the filament bundle returns to a 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 continuous high-frequency vibration of the filament bundle and the inner wall of the network device, thereby reducing the probability of terry yarn appearing; the airflow channel design of the jet rotating device makes the direction of the airflow not perpendicular to the filament bundle, but at a certain angle to the horizontal direction. Each time the airflow is injected, only half of the filament bundle is impacted. For example, the airflow first causes the filament bundles on the left to be entangled, and at the same time, the filament bundles on the right are wrapped around by the airflow. When the jet rotating device rotates 180°, the airflow causes the filament bundles on the right to be entangled again, and at the same time, the filament bundles on the left are wrapped around by the airflow. Such periodic repeated actions can form a better entangled structure between the filament bundles.

[0016] like Fig. 9 As shown in the figure, after the airflow is ejected from the airflow channel, a velocity gradient distribution gradually decreases from the axis to both sides; the fiber bundle channel is an umbrella-shaped structure. Under the impact of the axial airflow, the fiber bundle close to the inclined surface a vibrates at a high frequency and rotates clockwise along the arc surface driven by the airflow. When the airflow sends the fiber bundle close to the inclined surface a to the inclined surface b, the two parts of the fiber bundle complete an overall winding; Fig.10 As shown, when the jet rotating device rotates 180°, due to the change in airflow direction, the filament bundle close to the inclined surface b rotates counterclockwise along the arc surface, and when the airflow sends the filament bundle close to the inclined surface b to the position close to the inclined surface a, the two parts of the filament bundle complete the secondary overall winding; this is repeated, and the two parts of the filament bundle are wound around the single filament under the action of the jet airflow while rotating and winding as a whole. The rotation of the filament bundle forms a winding point, and repeated winding forms a network point, thereby improving the problem that industrial yarns with large single filament fineness are not easy to produce winding structures due to the large rigidity of the single filament.

[0017] As the preferred technical solution:

[0018] As described above, in a network device used for network points of polyester industrial yarn with large single-filament fineness, 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 6-10mm, and the central angle is 180-270°; the angle between the line segment a and the line segment b and the left and right directions is the same and the value range is 45-60°; the length of the line segment a and the line segment b is the same and the value range is 3-5mm; these parameters cooperate with each other, which is conducive to the winding of the yarn bundle, and the specific principle is: the airflow ejected from the airflow channel blows a part of the yarn bundle in the line segment a and line segment b areas, and the blown part of the yarn bundle generates high-frequency vibration and moves to the arc surface area of ​​the arc line; in the arc surface area, the airflow drives the yarn bundle to rotate along the arc surface direction and moves to the position of the part of the yarn bundle that has not been blown, and under the action of the turbulent airflow, the two parts of the yarn bundle (the blown part of the yarn bundle and the unblown part of the yarn bundle) are mixed to form a structure in which one part of the yarn bundle is wound around the other part of the yarn bundle.

[0019] As described above, a network device used for network points of polyester industrial yarn with large single-filament fineness, the length of the jet rotating device along the left-right direction is 14-18mm, the length of the major axis of the ellipsoidal ball is 8-10mm, the length of the minor axis of the ellipsoidal ball is 5-7mm, the diameter of the air flow channel is 4-6mm, the left and right cam handles are both cylindrical structures, the central axes are parallel to the left-right directions and the size is the same, and the diameter of the right cam handle is 2-3mm.

[0020] In the above-mentioned networker used for network points of polyester industrial yarn with large single-filament fineness, the jet rotating device is a ceramic part with a smooth surface and a surface roughness Ra value of 1.2-2.0 μm.

[0021] A networker for use in network points of polyester industrial yarn with large single-filament fineness as described above, wherein a left groove and a right groove are provided at the junction of a yarn bundle channel and a compressed air channel inside the networker;

[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, and the height of the gap between the two in the vertical direction is 0.05-0.1mm;

[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, and the height of the gap between the two in the vertical direction is 0.05-0.1mm;

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

[0025] In the above-mentioned network device used for network points of polyester industrial yarn with large single-filament fineness, the extension direction of the compressed air channel is parallel to the up-down direction.

[0026] As described above, a network device used for network points of polyester industrial yarn with large single-filament fineness has a lower curved surface that arches upward in the front-to-back direction and arches downward in the left-to-right direction. Such a design is conducive to the yarn bundle effectively contacting the jet rotating device, driving the jet rotating device to rotate. The maximum height of the yarn bundle channel in the up-and-down direction is 6-8mm, and the minimum height is 5-7mm; the length of the yarn bundle channel in 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 yarn bundle 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.

[0027] The present invention also provides a method for making network points for polyester industrial yarn with large single filament fineness, which comprises using a network device for making network points for polyester industrial yarn with large single filament fineness as described in any of the above items, passing the polyester industrial yarn with large single filament fineness through a yarn bundle channel, and continuously introducing compressed air into a 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.

[0028] As the preferred technical solution:

[0029] As described above, the method for making network dots for polyester industrial yarn with large single filament fineness has a winding speed of 2600-3000m / min, a winding tension of 90-380cN, a network pressure of 4.0-4.5bar, and after the polyester industrial yarn with large single filament fineness leaves the tow channel, the network degree is 10-20 per meter, and the number of coils is 0.0005-0.001 per meter.

[0030] Beneficial effects:

[0031] (1) The network device of the present invention is provided with a jet rotating device at the front end of the compressed air channel, so that the network device periodically jets airflow at a high frequency under the running force of the filament bundle, and as the jet rotating device rotates, the time for the same point position on the filament bundle to be impacted by the airflow is prolonged, thereby forming a firm winding structure and network point; the inclined airflow channel makes the airflow direction not perpendicular to the filament bundle, but the airflow direction is at a certain angle to the horizontal direction, and each time the airflow is jetted, only half of the filament bundle is impacted, and the periodic repeated action forms a better entanglement structure between the filament bundles, so that the industrial filament with large single filament fineness has a winding structure; at the same time, the filament bundle channel is an umbrella-shaped structure, and under the action of the jet airflow, the filament bundle is rotated and wound as a whole while the single filament is wound, and the rotation of the filament bundle forms a winding point, and the repeated winding forms a network point, thereby improving the problem that the industrial filament with large single filament fineness is not easy to form a winding structure due to the large rigidity of the single filament;

[0032] (2) When the jet rotating device of the network device of the present invention is turned off, the problem of terry yarns caused by the continuous injection of compressed air causing the yarn bundle to collide with the inner wall of the network device is avoided, which is beneficial to avoiding fiber damage of the yarn bundle;

[0033] (3) The network device of the present invention uses intermittent injection of compressed air, which saves compressed air, helps reduce energy consumption and costs, and is suitable for large-scale applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the three-dimensional structure of the network device 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 yes Figure 1 AA cross-sectional view of ;

[0036] Figure 3 is a schematic top view of the main layer of the network device of the present invention;

[0037] Figure 4 It is a front structural schematic diagram of the jet rotating device of the network device of the present invention;

[0038] Figure 5 It is a side structural schematic diagram of the jet rotating device of the network device of the present invention;

[0039] Figure 6 is a schematic diagram of the air flow channel of the network device of the present invention at a position where air is about to start to be ejected;

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

[0041] Figure 8 Schematic diagram of the position of the airflow channel of the network device of the present invention at the end of the air jet;

[0042] Fig. 9 It is a schematic diagram of the airflow flow of the jet rotating device of the network device of the present invention when jetting;

[0043] Fig.10 yes Fig. 9 The schematic diagram of the airflow of the jet rotating device after it rotates 180° is shown;

[0044] Among them, 11 is the main body layer, 12 is the compressed air channel, 14 is the jet rotating device, 21 is the non-detachable plate, 22 is the tow channel, 23 is the tow inlet, 31 is the upper cover layer, 41 is the detachable plate, 51 is the ellipsoid, 52 is the right convex handle, 53 is the airflow channel, 531 is the first port, 532 is the second port, 56 is the airflow, 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 jet rotating device along the left and 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 DESCRIPTION

[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 are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

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

[0047] Network degree: The network degree is tested by the manual needle moving method according to FZ / T 50001-2016 standard: measure a 1-meter-long tow, fix one end of the tow, and start from the fixed end. Use a needle to pierce the center of the tow and slide downward. If there is a tangle and resistance in the tow, it is regarded as a network point. Then use the same method from the bottom of the tangle. After the 1-meter-long tow is tested, count the number of network points. Test each tow twice, and take the average number of network points in the two tests, which is the network degree, unit: pieces / meter.

[0048] Number of loop yarns: The yarn bundle is tested using the YIS 200 hairiness detector. Based on the principle of the image method, when the yarn bundle continuously passes through the inspection area of ​​the sight glass, the sight glass continuously collects the two-dimensional information of the yarn bundle and hairiness, and digitally processes the collected arrival image to identify and extract the hairiness on the yarn bundle. Based on the processed image, the operator counts the number of loop yarns by checking and analyzing the yarn bundle morphology. The length of the yarn bundle for a single test is 10,000 meters, the yarn bundle running speed is 400 m / min, and the distance sensitivity is set to count if it is greater than 1,500 µm.

[0049] The number of intermittent injections of compressed air and the jet intensity: A pressure sensor is set on the inner wall of the wire bundle channel that is perpendicular to the compressed air channel to detect the number of intermittent injections of compressed air and the jet intensity. When the pressure of the compressed air acts on the sensor, the metal strain gauge of the sensitive element inside it is deformed. This deformation in turn causes the change of the inductance parameter, converting these pressure changes into a measurable electrical signal output, forming a periodic fluctuation image with time as the horizontal axis and intensity as the vertical axis 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 injections of compressed air. In addition, a pressure gauge is set on the compressed air channel. The compressed air pressure of the compressed air channel is consistent with the jet intensity of the network device. By checking the displayed data on the pressure gauge, it can be determined whether the jet intensity is stable.

[0050] Surface roughness Ra value: Use the needle-tracing method to detect the surface roughness Ra value, that is, use a diamond stylus to gently scratch the surface of the jet rotating device and the jet rotating device placement area. When the stylus slides, the surface roughness will cause the stylus to move up and down. This displacement causes the inductance of the sensor inductor coil to change, thereby generating an analog signal proportional to the surface roughness at the output end of the phase-sensitive rectifier; the signal enters the data acquisition system after amplification and level conversion, and the DSP chip performs digital filtering and parameter calculation on the collected data to finally obtain the Ra value.

[0051] Example 1

[0052] A networker for network points of polyester industrial yarn with large single-filament fineness, such as Figure 1-3 As shown, the network device 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-detachable plate 21 and a detachable plate 41, a tow channel 22 is arranged in the intermediate layer, and the extension direction of the tow channel 22 is parallel to the front-back direction, a compressed air channel 12 is arranged in the main body layer 11, and the compressed air channel 12 is located below the tow channel 22, and the extension direction of the compressed air channel 12 is parallel to the up-down direction, and an air jet rotating device 14 is installed at the junction of the tow channel 22 and the compressed air channel 12;

[0053] like Figure 4-5 As shown, the jet rotating 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 long axis of the elliptical ball 51 is parallel to the left-right direction. An air flow channel 53 is provided in the 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 ball 51. The air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12. The angle between the central axis of the air flow channel 53 and the long axis of the elliptical ball 51 is 30°.

[0054] like Figure 8-9 As shown, the inner surface of the tow channel 22 is composed of an upper curved surface and a lower curved surface, the upper curved surface is composed of an inclined surface a57, an arc surface 59, and an inclined surface b58; 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 in sequence, which are smoothly transitioned and connected, the bending direction of the arc line is downward, and the ends of the line segment a and the line segment 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 a57 ​​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 b58 and the cross section; the lower edge of the inclined surface a57 ​​is located directly above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined surface b58 is located directly above the junction of the right convex handle 52 and the ellipsoid 51; the lower curved surface is arched upward along the front-to-back direction and arched downward along the left-to-right direction;

[0055] The length of the tow channel 22 in the front-to-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 center angle is 240°, the angles between the line segment a and the line segment b and the left-right direction are the same and are 52°, and the lengths of the line segment a and the line segment b are the same and are 4 mm;

[0056] The length of the jet rotating device 14 along the left-right direction is 16 mm, the length of the major axis of the ellipsoid 51 is 9 mm, the length of the minor axis of the ellipsoid 51 is 6 mm, the diameter of the airflow channel 53 is 5 mm, the left and right lugs 52 are both cylindrical structures, the central axes are parallel to the left-right direction and the dimensions are the same, and the diameter of the right lug 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;

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

[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 elliptical ball 51. The whole formed by the left convex handle and the left end of the elliptical ball 51 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.08±0.01mm;

[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 elliptical ball 51. The whole formed by the right convex handle 52 and the right end of the elliptical ball 51 is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.08±0.01mm;

[0060] During installation, after the jet rotating device 14 is placed in the jet rotating device placement area, the removable plate 41, the non-removable plate 21 and the upper cover layer 31 are covered, and the three layers of the main body layer 11, the non-removable plate 21 and the upper cover layer 31 are locked with fixing screws. The removable plate 41 is located above the main body layer 11, and the removable plate 41 and the main body layer 11 are also locked with fixing screws. A gap is left between the non-removable plate 21 and the removable plate 41, and the gap is the bundle entrance 23, and the bundle entrance 23 is connected to the bundle channel 22; the installation method of the jet rotating device 14 satisfies: when the bundle 61 passes through the bundle 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 and right directions. When the jet rotating device 14 rotates to Figure 6 When the air flow channel 53 is in the position shown, the compressed air will be ejected; when the jet rotating device 14 rotates to Figure 7 When the air flow passage 53 is fully opened, the air flow passage 53 is fully opened. Figure 8When the position is shown, the air flow channel 53 is closed, and the air jet rotating device 14 dynamically opens and closes the air flow channel. As the air jet rotating device 14 rotates, the air flow 56 in the tow channel 22 changes as shown in FIG. Figure 9-10 shown.

[0061] Example 2

[0062] A networker for network points of polyester industrial yarn with large single-filament fineness, such as Figure 1-3 As shown, the network device 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-detachable plate 21 and a detachable plate 41, a tow channel 22 is arranged in the intermediate layer, and the extension direction of the tow channel 22 is parallel to the front-back direction, a compressed air channel 12 is arranged in the main body layer 11, and the compressed air channel 12 is located below the tow channel 22, and the extension direction of the compressed air channel 12 is parallel to the up-down direction, and an air jet rotating device 14 is installed at the junction of the tow channel 22 and the compressed air channel 12;

[0063] like Figure 4-5 As shown, the jet rotating 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 long axis of the elliptical ball 51 is parallel to the left-right direction. An air flow channel 53 is provided in the 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 ball 51. The air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12. The angle between the central axis of the air flow channel 53 and the long axis of the elliptical ball 51 is 45°.

[0064] like Figure 8-9 As shown, the inner surface of the tow channel 22 is composed of an upper curved surface and a lower curved surface, the upper curved surface is composed of an inclined surface a57, an arc surface 59, and an inclined surface b58; 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 in sequence, which are smoothly transitioned and connected, the bending direction of the arc line is downward, and the ends of the line segment a and the line segment 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 a57 ​​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 b58 and the cross section; the lower edge of the inclined surface a57 ​​is located directly above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined surface b58 is located directly above the junction of the right convex handle 52 and the ellipsoid 51; the lower curved surface is arched upward along the front-to-back direction and arched downward along the left-to-right direction;

[0065] The length of the tow channel 22 in the front-to-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 angle between the line segment a and the line segment b and the left-right direction is the same and is 45°, and the length of the line segment a and the line segment b is the same and is 5 mm;

[0066] The length of the jet rotating device 14 along the left-right direction is 18 mm, the length of the major axis of the ellipsoid 51 is 10 mm, the length of the minor axis of the ellipsoid 51 is 7 mm, the diameter of the airflow channel 53 is 6 mm, the left and right lugs 52 are both cylindrical structures, the central axes are parallel to the left-right direction and the dimensions are the same, and the diameter of the right lug 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] like Figure 3 As shown, a left groove and a right groove are provided at the junction of the tow channel 22 and the compressed air channel 12, and the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.9±0.1μm;

[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 elliptical ball 51. The whole formed by the left convex handle and the left end of the elliptical ball 51 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.1±0.01mm;

[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 elliptical ball 51. The whole formed by the right convex handle 52 and the right end of the elliptical ball 51 is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.1±0.01mm;

[0070] During installation, after the jet rotating device 14 is placed in the jet rotating device placement area, the removable plate 41, the non-removable plate 21 and the upper cover layer 31 are covered, and the three layers of the main body layer 11, the non-removable plate 21 and the upper cover layer 31 are locked with fixing screws. The removable plate 41 is located above the main body layer 11, and the removable plate 41 and the main body layer 11 are also locked with fixing screws. A gap is left between the non-removable plate 21 and the removable plate 41, and the gap is the bundle entrance 23, and the bundle entrance 23 is connected to the bundle channel 22; the installation method of the jet rotating device 14 satisfies: when the bundle 61 passes through the bundle 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 and right directions. When the jet rotating device 14 rotates to Figure 6 When the air flow channel 53 is in the position shown, the compressed air will be ejected; when the jet rotating device 14 rotates to Figure 7 When the air flow passage 53 is fully opened, the air flow passage 53 is fully opened. Figure 8When the position is shown, the air flow channel 53 is closed, and the air jet rotating device 14 dynamically opens and closes the air flow channel. As the air jet rotating device 14 rotates, the air flow 56 in the tow channel 22 changes as shown in FIG. Figure 9-10 shown.

[0071] Example 3

[0072] A networker for network points of polyester industrial yarn with large single-filament fineness, such as Figure 1-3 As shown, the network device 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-detachable plate 21 and a detachable plate 41, a tow channel 22 is arranged in the intermediate layer, and the extension direction of the tow channel 22 is parallel to the front-back direction, a compressed air channel 12 is arranged in the main body layer 11, and the compressed air channel 12 is located below the tow channel 22, and the extension direction of the compressed air channel 12 is parallel to the up-down direction, and an air jet rotating device 14 is installed at the junction of the tow channel 22 and the compressed air channel 12;

[0073] like Figure 4-5 As shown, the jet rotating 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 long axis of the elliptical ball 51 is parallel to the left-right direction. An air flow channel 53 is provided in the 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 ball 51. The air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12. The angle between the central axis of the air flow channel 53 and the long axis of the elliptical ball 51 is 37°.

[0074] like Figure 8-9 As shown, the inner surface of the tow channel 22 is composed of an upper curved surface and a lower curved surface, the upper curved surface is composed of an inclined surface a57, an arc surface 59, and an inclined surface b58; 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 in sequence, which are smoothly transitioned and connected, the bending direction of the arc line is downward, and the ends of the line segment a and the line segment 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 a57 ​​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 b58 and the cross section; the lower edge of the inclined surface a57 ​​is located directly above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined surface b58 is located directly above the junction of the right convex handle 52 and the ellipsoid 51; the lower curved surface is arched upward along the front-to-back direction and arched downward along the left-to-right direction;

[0075] The length of the tow channel 22 in the front-to-back 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 are 60°, and the lengths of the line segment a and the line segment b are the same and are 3 mm;

[0076] The length of the jet rotating device 14 along the left-right direction is 14 mm, the length of the major axis of the ellipsoid 51 is 8 mm, the length of the minor axis of the ellipsoid 51 is 5 mm, the diameter of the airflow channel 53 is 4 mm, the left and right lugs 52 are both cylindrical structures, the central axes are parallel to the left-right direction and the dimensions are the same, and the diameter of the right lug 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] like Figure 3 As shown, a left groove and a right groove are provided at the junction of the tow channel 22 and the compressed air channel 12, and the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.9±0.1μm;

[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 elliptical ball 51. The whole formed by the left convex handle and the left end of the elliptical ball 51 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05±0.01mm;

[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 elliptical ball 51. The whole formed by the right convex handle 52 and the right end of the elliptical ball 51 is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05±0.01mm;

[0080] During installation, after the jet rotating device 14 is placed in the jet rotating device placement area, the removable plate 41, the non-removable plate 21 and the upper cover layer 31 are covered, and the three layers of the main body layer 11, the non-removable plate 21 and the upper cover layer 31 are locked with fixing screws. The removable plate 41 is located above the main body layer 11, and the removable plate 41 and the main body layer 11 are also locked with fixing screws. A gap is left between the non-removable plate 21 and the removable plate 41, and the gap is the bundle entrance 23, and the bundle entrance 23 is connected to the bundle channel 22; the installation method of the jet rotating device 14 satisfies: when the bundle 61 passes through the bundle 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 and right directions. When the jet rotating device 14 rotates to Figure 6 When the air flow channel 53 is in the position shown, the compressed air will be ejected; when the jet rotating device 14 rotates to Figure 7 When the air flow passage 53 is fully opened, the air flow passage 53 is fully opened. Figure 8When the position is shown, the air flow channel 53 is closed, and the air jet rotating device 14 dynamically opens and closes the air flow channel. As the air jet rotating device 14 rotates, the air flow 56 in the tow channel 22 changes as shown in FIG. Figure 9-10 shown.

[0081] Example 4

[0082] A method for making network dots for polyester industrial yarn with large single filament fineness, comprising: using the network device provided in Example 1, passing the polyester industrial yarn with large single filament fineness through a yarn bundle channel, and continuously introducing compressed air into the compressed air channel, wherein the single filament fineness of the polyester industrial yarn with 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 network pressure is 4.3 bar.

[0083] After the polyester industrial yarn with large single filament fineness leaves the tow channel, the network density is 15 per meter and the number of loop yarns is 0.0008 per meter.

[0084] Example 5

[0085] A method for making network dots for polyester industrial yarn with large single filament fineness, using the network device provided in Example 2, passing the polyester industrial yarn with large single filament fineness through a yarn bundle channel, and continuously introducing compressed air into the compressed air channel, wherein the single filament fineness of the polyester industrial yarn with large single filament fineness is 40dtex, the multifilament fineness is 2000dtex, the winding speed is 2600m / min, the winding tension is 380cN, and the network pressure is 4.0bar.

[0086] After the polyester industrial yarn with large single-filament fineness leaves the tow channel, the network density is 10 per meter and the number of loop yarns is 0.001 per meter.

[0087] Example 6

[0088] A method for making network dots for polyester industrial yarn with large single filament fineness, using the network device provided in Example 3, passing the polyester industrial yarn with large single filament fineness through a yarn bundle channel, and continuously introducing compressed air into the compressed air channel, wherein the single filament fineness of the polyester industrial yarn with 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 network pressure is 4.5 bar.

[0089] After the polyester industrial yarn with large single filament fineness leaves the tow channel, the network density is 20 per meter and the number of loop yarns is 0.0005 per meter.

[0090] Comparative Example 1

[0091] A method for making network dots for polyester industrial yarn with large single-filament fineness is basically the same as that in Example 4, except that: in the network device used, the air flow channel is a cylindrical channel, and the angle between the central axis of the air flow channel and the long 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 loops is 0.002 per meter.

[0093] Comparative Example 2

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

[0095] After the tow leaves the tow channel, the network degree is 6 pieces / meter and the number of loops is 0.002 pieces / meter.

[0096] Comparative Example 3

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

[0098] After the tow leaves the tow channel, the network degree is 6 pieces / meter and the number of loops is 0.004 pieces / meter.

[0099] Comparative Example 4

[0100] A method for making interlacing dots for polyester industrial yarn with large single-filament fineness is basically the same as that of Example 4, except that: in the interlacing device used, the width of the yarn bundle channel in the left and right directions is the same.

[0101] After the tow leaves the tow channel, the network degree is 6 pieces / meter and the number of loops is 0.002 pieces / meter.

[0102] Comparative Example 5

[0103] A method for making interlacing dots for polyester industrial yarn with large single-filament fineness is basically the same as that in Example 5, except that: in the interlacing device used, the width of the yarn bundle channel in the left and right directions is the same.

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

[0105] Comparative Example 6

[0106] A method for making interlacing dots for polyester industrial yarn with large single-filament fineness is basically the same as that of Example 6, except that: in the interlacing device used, the width of the yarn bundle channel in the left and right directions is the same.

[0107] After the tow leaves the tow channel, the network degree is 6 pieces / meter and the number of loops is 0.003 pieces / meter.

[0108] By comparison, the network degree of the tow obtained in Examples 4-6 is 10-20 per meter, and the number of coils is 0.0005-0.001 per meter, the network degree of the tow obtained in Comparative Examples 1-3 is 4-6 per meter, and the number of coils is 0.002-0.004 per meter, and the network degree of the tow obtained in Comparative Examples 4-6 is 6-8 per meter, and the number of coils is 0.002-0.003 per meter. Compared with Comparative Examples 1-3 and Comparative Examples 4-6, the network degree of the tow obtained in Example 4-6 is significantly improved, and the number of coils is significantly reduced.

[0109] This shows that: the airflow channel of the network device of the present invention is a cylindrical channel, the angle between the central axis of the airflow channel and the major axis of the ellipsoid is greater than 0° and less than 90°, the airflow channel is in an inclined state, and 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, and the tow channel is an umbrella-shaped structure; the inclined airflow channel and the umbrella-shaped tow channel play a synergistic role, thereby improving the network degree of the polyester industrial yarn with a large single-filament fineness and reducing the number of looped yarns, because:

[0110] The inclined airflow channel makes the direction of the airflow not perpendicular to the filament bundle, but at a certain angle to the horizontal direction. Each time the airflow is jetted, only half of the filament bundle is impacted. For example, the airflow first causes the filament bundles on the left to be entangled, and at the same time, the filament bundles on the right are entangled under the entrainment of the airflow. When the jet rotating device rotates 180°, the airflow causes the filament bundles on the right to be entangled again, and at the same time, the filament bundles on the left are entangled under the entrainment of the airflow. Such a periodic and repeated action is conducive to the formation of an entangled structure between the filament bundles.

[0111] At the same time, after the airflow is ejected from the inclined airflow channel, a velocity gradient distribution gradually decreases from the axis to both sides, such as Fig. 9 As shown in the figure, the tow channel is an umbrella-shaped structure. When the tow is impacted by the axial airflow, the tow near the inclined surface a vibrates at a high frequency and rotates clockwise along the arc surface driven by the airflow. When the airflow sends the tow near the inclined surface a to the inclined surface b, the two parts of the tow complete an overall winding. Fig.10As shown, when the jet rotating device rotates 180°, due to the change in airflow direction, the filament bundle close to the inclined surface b rotates counterclockwise along the arc surface, and when the airflow sends the filament bundle close to the inclined surface b to the position close to the inclined surface a, the two parts of the filament bundle complete the secondary overall winding; this is repeated, and the two parts of the filament bundle are wound around the single filament under the action of the jet airflow while rotating and winding as a whole. The rotation of the filament bundle forms a winding point, and repeated winding forms a network point, thereby improving the problem that industrial yarns with large single filament fineness are not easy to produce winding structures due to the large rigidity of the single filament.

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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