Method for adding network points to thick-denier polyester industrial yarn 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 thick-denier polyester industrial yarns and a nozzle used therefor. A nozzle for adding network points to thick-denier polyester industrial yarns is internally provided with a tow channel, a compressed air channel, and a jet rotating device, and the jet rotating device is installed at the junction of the tow channel and the compressed air channel; the jet rotating device includes an annular boss, a left convex handle, an elliptical ball, and a right convex handle, and the annular boss is fixedly sleeved on the elliptical ball; an air flow channel is provided in the jet rotating device, and the air flow channel penetrates through the annular boss and the elliptical ball; when the tow passes through the tow channel, it contacts the annular boss and drives the jet rotating device to perform a rotating motion. A method for adding network points to thick-denier polyester industrial yarns is to pass the thick-denier polyester industrial yarns through the tow channel of the nozzle and continuously introduce compressed air into the compressed air channel. The nozzle and the method for adding network points of the present invention solve the problem of difficult network addition for thick-denier polyester yarns and are suitable for large-scale applications.

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 thick denier polyester industrial yarns 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 rope nets, and canvas. They come in various types and specifications to meet the requirements of different application scenarios. Currently, the fineness of polyester industrial yarns produced by the one-step method is between 75D and 8000D. Among them, the production of thick denier polyester industrial yarns above 4000D needs to be produced by the ply method and then passed through a network device to form a yarn bundle with a certain number of network points and network degree (network points are structures where single filaments in the yarn bundle are tightly entangled and not easily loosened. The number of entangled structures per meter on the yarn bundle is called the network degree. The higher the network degree, the better the cohesion of the yarn bundle).

[0003] Existing network devices are mainly divided into two types. One continuously jets air flow, and the other jets air flow intermittently. The network device with continuous air flow jetting has a simple structure and is easy to operate. However, due to the large fineness of thick denier polyester industrial yarns, when using a network device with continuous air flow jetting, a larger compressed air is required to add firm network points. But when the pressure is too high, the number of network points no longer increases significantly, and the higher the vibration frequency of the yarn bundle in the network device, the stronger the impact. This impact is likely to break or unevenly stretch the single filaments, resulting in looped yarns, making it difficult to meet the two requirements of no looped yarns and high network fastness for the yarn bundle. The network device with intermittent air flow jetting adds an intermittent air flow control device at the front end of the network device, which can accurately add points, is not likely to produce looped yarns, and saves the cost of compressed air. However, the air flow cut-off point of the intermittent air flow jetting is far from the end of the yarn bundle, which is likely to cause the air flow to be cut off before reaching the end of the yarn bundle when high-frequency air flow is jetted, resulting in a decrease in the impact pressure. Especially for thick denier polyester industrial yarns, due to the thicker diameter of the yarn bundle, the traveling path of the air flow is longer, and the impact pressure on the single filaments farther from the air flow jetting port decreases more significantly, resulting in loose network points of the yarn bundle and low network fastness.

[0004] Patent CN209537712U discloses a winding device capable of improving the network degree of thick denier yarns, which includes a main network device and a standby network device. The thick denier yarn is first networked for the first time through the main network device, and then networked for the second time through the standby network device. The disadvantage is that although the method of double networking can increase the network points without increasing the network pressure, the double network device does not improve the problem of large vibration of the yarn bundle caused by the increase in compressed air, and the double network device also fails to improve the method of adding network points, which is not conducive to forming firm network points for thick denier polyester industrial yarns. In addition, the compressed air flow consumed by the double network device doubles, which is not conducive to saving compressed air and energy consumption.

[0005] Therefore, it is necessary to develop a method for adding network points to thick denier polyester industrial yarns that can improve network fastness and save compressed air, as well as a nozzle used therefor. 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 thick denier polyester industrial yarns and a nozzle used therefor.

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

[0008] A nozzle for adding network points to thick denier polyester industrial yarns is internally provided with a tow channel and a compressed air channel. The extending direction of the tow channel is parallel to the front-back direction, the compressed air channel is located below the tow channel, and a jet rotation device is further provided inside;

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

[0010] An air flow channel is provided inside the jet rotation device. The air flow channel is the only channel between the tow channel and the compressed air channel, and the extending direction of the air flow channel is perpendicular to the left-right direction;

[0011] The jet rotation device includes an annular boss, 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, the central axis of the annular boss coincides with the major axis of the ellipsoid, the annular boss is fixedly sleeved on the ellipsoid, and the air flow channel penetrates through the annular boss and the ellipsoid;

[0012] The installation method of the jet rotation device satisfies that when the tow passes through the tow channel, it contacts the jet rotation device and drives the jet rotation device to rotate around a central axis parallel to the left-right direction.

[0013] The jet air stream impacts the tow in the tow channel, causing the tow to generate high-frequency vibrations. The air flow in the tow channel will generate turbulence due to the high-frequency vibrations of the tow. Especially for industrial tow of thick denier polyester, the number of filaments in the tow is large, and severe turbulence is not conducive to the opening and interwinding of the filaments in the tow, making it difficult to generate network points. The jet rotation device is provided with an annular boss. When the industrial tow of thick denier polyester passes through the networker, the tow is laid above and on both sides of the annular boss. The laying thickness of the tow above the annular boss is smaller, and the laying thickness of the tow on both sides of the annular boss is larger. When jetting the air stream, the tow above the annular boss is first impacted by the high-pressure air stream, realizing the opening and winding of the filaments and moving towards both sides of the annular boss. Part of the tow on both sides of the annular boss returns above the annular boss under the action of the backflow air pressure and is impacted by the jet air stream again, forming a new winding pattern. When there is no annular boss, the laying thickness of the industrial tow of thick denier polyester in the jet orifice area of the air flow channel is large, and the air flow is not easy to penetrate the tow forward. Instead, it is easier to form turbulence, reducing the probability of generating network points and also reducing the network fastness.

[0014] As a preferred technical solution:

[0015] For a networker used for making network points on industrial tow of thick denier polyester as described above, both ports of the air flow channel are elliptical, denoted as ellipse a and ellipse b respectively. Ellipse b is formed by rotating ellipse a by 90° around the center. The air flow channel is a gradient structure, gradually changing from ellipse a to ellipse b.

[0016] The reason why it is not easy to make network points on thick denier industrial tow is that the tow has a large fineness and a large number of filaments, and it is not easy to achieve an entangled structure with high-frequency vibrations in the networker. Therefore, the present invention changes the air flow pattern impacting the tow, and then changes the single high-frequency vibration state, so that the tow changes its movement trajectory in the periodic air flow pattern, thereby generating an entangled structure.

[0017] For a networker used for making network points on industrial tow of thick denier polyester as described above, the short axis length L11 of ellipse a is 2 - 4 mm, and the long axis length L12 of ellipse a is 4 - 6 mm.

[0018] For a networker used for making network points on industrial tow of thick denier polyester as described above, the length L4 of the jet rotation device in the left-right direction is 14 - 18 mm, the width L2 of the annular boss in the left-right direction is 6 - 8 mm, the wall thickness L7 of the annular boss is 1 - 2 mm, the long axis length L3 of the ellipsoid is 8 - 10 mm, the short axis length L5 of the ellipsoid is 5 - 7 mm. Both the left convex handle and the right convex handle are cylindrical structures, the central axis is parallel to the left-right direction and they have the same size. The diameter L6 of the right convex handle is 2 - 3 mm, the width of the tow channel in the left-right direction is 5 - 7 mm, and the length of the tow channel in the front-back direction is 35 - 45 mm.

[0019] A texturing device for texturing thick denier polyester industrial yarn as described above, the air flow channel passing through the center of the ellipsoid.

[0020] A texturing device for texturing thick denier polyester industrial yarn as described above, the jet rotating device being a ceramic part with a smooth surface, and the surface roughness Ra value being 1.2 - 2.0 μm.

[0021] A texturing device for texturing thick denier polyester industrial yarn as described above, at the junction of the internal filament bundle channel and the compressed air channel of the texturing device for thick denier polyester industrial yarn, there are a left groove and a right groove;

[0022] The shape of the left groove is the same as the overall shape formed by the left convex handle and the left end of the ellipsoid, and its size is larger than the overall shape formed by the left convex handle and the left end of the ellipsoid. The overall shape formed by the left convex handle and the left end of the ellipsoid is embedded in the left groove, and the height of the gap between the two in the up - down direction is 0.05 - 0.1 mm;

[0023] The shape of the right groove is the same as the overall shape formed by the right convex handle and the right end of the ellipsoid, and its size is larger than the overall shape formed by the right convex handle and the right end of the ellipsoid. The overall shape formed by the right convex handle and the right end of the ellipsoid is embedded in the right groove, and the height of the gap between the two in the up - down direction is 0.05 - 0.1 mm;

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

[0025] A texturing device for texturing thick denier polyester industrial yarn as described above, the extending direction of the compressed air channel is parallel to the up - down direction.

[0026] A texturing device for texturing thick denier polyester industrial yarn as described above, the texturing device for thick denier polyester industrial yarn is divided into an upper cover layer, an intermediate layer, and a main body layer arranged in sequence from top to bottom. The filament bundle channel is arranged in the intermediate layer, and the compressed air channel is arranged in the main body layer. The filament bundle channel is jointly surrounded by a left wall, a right wall, an upper wall, and a lower wall. The left wall is composed of two parts, the lower part of the left wall is detachably connected to the lower wall, and there is a gap between the lower part of the left wall and the upper part of the left wall, and this gap is the filament bundle inlet.

[0027] A networker for adding network points to thick denier polyester industrial yarns as described above, the right side of the left wall, the left side of the right wall, and the lower surface of the upper wall are all flat surfaces, and the upper surface of the lower wall is a curved surface. This 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 jet rotation device, driving the jet rotation device to rotate; the right side of the left wall and the left side of the right wall are both vertical surfaces, and the lower surface of the upper wall is a horizontal surface. The maximum distance between the lower surface of the upper wall and the upper surface of the lower wall is 9 - 12 mm, and the minimum distance is 6 - 9 mm.

[0028] The present invention also provides a method for adding network points to thick denier polyester industrial yarns. Using the networker for adding network points to thick denier polyester industrial yarns described in any one of the above, the thick denier polyester industrial yarn is passed through the yarn bundle channel, and compressed air is continuously introduced into the compressed air channel.

[0029] As a preferred technical solution:

[0030] For the method for adding network points to thick denier polyester industrial yarns as described above, the specification of the thick denier polyester industrial yarn is 4400 - 8800 dtex / 488 - 976 f, the winding speed is 2600 - 2850 m / min, the winding tension is 600 - 1200 cN, the network pressure is 4.0 - 4.5 bar. After the yarn bundle leaves the yarn bundle channel, the network density is 11 - 18 pieces / meter, the number of looped yarns is 0.0001 - 0.0004 pieces / meter, and the network fastness is 83 - 93%.

[0031] Beneficial effects:

[0032] (1) The jet rotation device of the networker of the present invention is provided with an annular boss. When the thick denier polyester industrial yarn passes through the networker, the yarn bundle is laid above and on both sides of the annular boss. The laying thickness of the yarn bundle above the annular boss is smaller, and the laying thickness of the yarn bundle on both sides of the annular boss is larger. When jetting air, the yarn bundle above the annular boss is first impacted by the high-pressure air flow, realizing single-filament opening and winding and moving towards both sides of the annular boss. Part of the yarn bundle on both sides of the annular boss returns above the annular boss under the action of the backflow air pressure and is impacted by the jet air flow again, forming a new winding form, which is conducive to the formation of firm network points for the thick denier polyester industrial yarn, solving the problem of difficult network formation for thick denier polyester yarns;

[0033] (2) The networker of the present invention uses intermittent jetting of compressed air, which can save compressed air, is conducive to energy conservation and consumption reduction, and is suitable for large-scale applications. Description of the drawings

[0034] Figure 1It is a schematic three-dimensional structure diagram of the network device according to Embodiments 1-3 of the present invention. Among them, 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 schematic A-A sectional view of;

[0036] Figure 3 It is a schematic top view of the main body layer of the network device according to Embodiments 1-3 of the present invention;

[0037] Figure 4 It is a schematic front view of the jet rotation device of the network device according to Embodiments 1-3 of the present invention;

[0038] Figure 5 It is a schematic side view of the jet rotation device of the network device according to Embodiments 1-3 of the present invention;

[0039] Figure 6 It is a schematic diagram of the position of the air flow channel of the network device according to Embodiments 1-3 of the present invention before starting to jet;

[0040] Figure 7 It is a schematic diagram of the position of the air flow channel of the network device according to Embodiments 1-3 of the present invention when the jet is fully opened;

[0041] Figure 8 It is a schematic diagram of the position of the air flow channel of the network device according to Embodiments 1-3 of the present invention at the end of jetting;

[0042] Figure 9 It is a schematic diagram of the air flow of the network device according to Embodiments 1-3 of the present invention;

[0043] Figure 10 It is a schematic diagram of the structure of the jet rotation device of the network device according to Embodiments 4-6 of the present invention (the air flow channel is a gradient structure, and the first port 531 of the air flow channel is an ellipse a);

[0044] Figure 11 It is a schematic diagram of the structure of the jet rotation device of the network device according to Embodiments 4-6 of the present invention (the air flow channel is a gradient structure, and the second port 532 of the air flow channel is an ellipse b);

[0045] Figure 12 It is a schematic diagram of the structure of the air flow channel of the network device according to Embodiments 4-6 of the present invention (the air flow channel is a gradient structure, the first port 531 of the air flow channel is an ellipse a, and the second port 532 of the air flow channel is an ellipse b);

[0046] Among them, 11 is the main body layer, 12 is the compressed air channel, 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 jet rotating device, 52 is the right convex handle, 53 is the air flow channel, 531 is the first port of the air flow channel, 532 is the second port of the air flow channel, 54 is the annular boss, 55 is the ellipsoid, 56 is the air flow, 61 is the tow, L1 is the diameter of the cylindrical air flow channel, L2 is the width of the annular boss in the left-right direction, L3 is the major axis length of the ellipsoid, L4 is the length of the jet rotating device in the left-right direction, L5 is the minor axis length of the ellipsoid, L6 is the diameter of the right convex handle, L7 is the wall thickness of the annular boss, L11 is the minor axis length of the ellipse a, and L12 is the major axis length of the ellipse a. Detailed implementation manners

[0047] The present invention will be further described below in conjunction with specific implementation manners. 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.

[0048] The following are the test methods for relevant performance indicators in each embodiment and comparative example:

[0049] Degree of entanglement: The degree of entanglement is tested by the manual needle transfer method according to the standard of FZ / T 50001-2016: Measure a tow with a length of 1 meter, fix one end of the tow, start from the fixed end, pierce the center position of the tow with a needle and slide it downwards. When there is entanglement and resistance in the tow, it is regarded as an entanglement point. Then start from below the entanglement and use the same method to operate until the 1-meter-long tow is tested. Count the number of entanglement points; each tow is tested twice, and the average value of the number of entanglement points in the two tests is taken as the degree of entanglement, unit: number / meter.

[0050] Fastness of entanglement: The degree of entanglement of the tow is tested under the condition of applying a certain tension to the tow. The ratio of the degree of entanglement after applying tension to the degree of entanglement before applying tension is the fastness of entanglement. The specific method is: Use polyester industrial yarn to test on a needle punching instrument. Test the degree of entanglement three times without adding tension and take the average value. Then add a tension of 0.2 cN / dtex and test the degree of entanglement three times and take the average value. The ratio of the average value of the degree of entanglement after applying tension to the average value of the degree of entanglement before applying tension is the fastness of entanglement.

[0051] Number of coiled filaments: It is detected by using a YIS 200 hairiness detector. Based on the principle of image method, when the tow continuously passes through the sight glass detection area, the sight glass continuously collects two-dimensional information of the tow and the hairiness. Digital processing is performed on the collected image to identify and extract the hairiness on the tow. According to the processed image, the operator counts the number of coiled 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.

[0052] Number of intermittent jetting of compressed air and jetting intensity: The number of intermittent jetting of compressed air and the jetting intensity are detected 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 then causes a change in the inductance parameter. These pressure changes are converted into measurable electrical signals and output, forming a periodic fluctuation image on the central control display with time as the abscissa and intensity as the ordinate. The peak of the fluctuation image is the jetting intensity of the compressed air, and the number of peaks in one minute is the number of intermittent jetting of compressed air. In addition, a pressure gauge is set on the compressed air channel, and the compressed air pressure in the compressed air channel is consistent with the jetting intensity of the networker. Whether the jetting intensity is stable can be judged by viewing the display data of the pressure gauge.

[0053] Surface roughness Ra value: The surface roughness Ra value is detected by using the needle tracing method, that is: a diamond stylus is gently drawn on the surfaces of the jet rotating device and the jet rotating device placement area. When the stylus slides, the surface roughness causes the stylus to generate up and down displacements. This displacement causes a change in 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. This 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.

[0054] Example 1

[0055] A networker used for making network points on thick denier polyester industrial yarns, as Figure 1 shown, is composed of a main body layer 11, a non-removable plate 21, an upper cover layer 31, a removable plate 41, and a jet rotating device 51. The non-removable plate 21 and the removable plate 41 form an intermediate layer, and the upper cover layer 31, the intermediate layer, and the main body layer 11 are arranged in sequence from top to bottom;

[0056] The inner part of the middle layer is provided with a tow channel 22. The extending direction of the tow channel 22 is parallel to the front-back direction. The tow channel 22 is jointly formed by a left wall, a right wall, an upper wall, and a lower wall. The left wall consists of upper and lower parts. The lower part of the left wall is detachably connected to the lower wall. The detachable plate 41 forms the lower part of the left wall. There is a gap between the lower part of the left wall and the upper part of the left wall, and this gap is the tow inlet 23. The right side surface of the left wall, the left side surface of the right wall, and the lower surface of the upper wall are all flat surfaces, and the upper surface of the lower wall is a curved surface. Along the front-back direction, this curved surface arches upward, and along the left-right direction, this curved surface arches downward. The right side surface of the left wall and the left side surface of the right wall are both vertical surfaces, and the lower surface of the upper wall is a horizontal surface. The maximum distance between the lower surface of the upper wall and the upper surface of the lower wall is 10 mm, and the minimum distance between the lower surface of the upper wall and the upper surface of the lower wall is 7 mm.

[0057] An air pressure channel 12 is arranged in the main body layer 11, and the air pressure channel 12 is located below the tow channel 22.

[0058] The jet rotation device 51 is installed at the junction of the tow channel 22 and the air pressure channel 12, as Figure 2 and Figure 3 shown; an air flow channel 53 is provided in the jet rotation device 51. The air flow channel 53 is the only channel between the tow channel 22 and the air pressure channel 12. The extending direction of the air flow channel 53 is perpendicular to the left-right direction, and the extending direction of the air pressure channel 12 is parallel to the up-down direction. As Figure 4 and Figure 5 shown, the jet rotation device 51 is composed of an annular boss 54, a left convex handle, a right convex handle 52, and an ellipsoid 55 arranged in sequence along the left-right direction. The major axis of the ellipsoid 55 is parallel to the left-right direction, and the central axis of the annular boss 54 coincides with the major axis of the ellipsoid 55. The annular boss 54 is fixedly sleeved on the ellipsoid 55. The width L2 of the annular boss 54 along the left-right direction is 7 mm, and the wall thickness L7 of the annular boss 54 is 2 mm. The air flow channel 53 is located inside the ellipsoid 55. The air flow channel 53 penetrates through the annular boss 54 and the ellipsoid 55 and passes through the center of the ellipsoid 55.

[0059] The length L4 of the jet rotation device 51 along the left-right direction is 16 mm, the major axis length L3 of the ellipsoid 55 is 9 mm, and the minor axis length L5 of the ellipsoid 55 is 6 mm.

[0060] The air flow channel 53 is a cylindrical air flow channel. The diameter L1 of the cylindrical air flow channel is 5 mm. Both the right convex handle 52 and the left convex handle are cylindrical structures, the central axes are parallel to the left-right direction and have the same dimensions. The diameter L6 of the right convex handle 52 is 2 mm. The jet rotation device 51 is a ceramic part with a smooth surface, and the surface roughness Ra value of the jet rotation device 51 is 1.6 ± 0.4 μm.

[0061] The width of the tow channel 22 in the left - right direction is 6 mm, and the length of the tow channel 22 in the front - back direction is 40 mm;

[0062] At the junction of the tow channel 22 and the compressed air channel 12, there are a left groove and a right groove;

[0063] 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 55, and its size is larger than the whole formed by the left convex handle and the left end of the ellipsoid 55. The whole formed by the left convex handle and the left end of the ellipsoid 55 is embedded in the left groove, and the height of the gap between them in the up - down direction is 0.08 ± 0.01 mm;

[0064] 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 55, and its size is larger than the whole formed by the right convex handle 52 and the right end of the ellipsoid 55. The whole formed by the right convex handle 52 and the right end of the ellipsoid 55 is embedded in the right groove, and the height of the gap between them in the up - down direction is 0.08 ± 0.01 mm; The surfaces of the left groove and the right groove are smooth - treated, and the Ra value of the surface roughness of the left groove and the right groove is 0.9 ± 0.1 μm;

[0065] During installation, first place the jet - rotating device 51 into the cavity composed of the left groove, the right groove and the compressed air channel 12, and then cover the non - detachable plate 21, the upper cover layer 31 and the detachable plate 41. The detachable plate 41 is located above the main body layer 11 and on one side of the non - detachable plate 21. 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. Also use fixing screws to lock the two layers of the detachable plate 41 and the main body layer 11. The function of the detachable plate 41 is to fix the lower part of the left wall of the tow channel 22; The installation method of the jet - rotating device 51 satisfies that when the tow 61 passes through the tow channel 22, it contacts the annular boss 54 and drives the jet - rotating device 51 to rotate around the central axis parallel to the left - right direction. By the rotation of the jet - rotating device 51, the air - flow channel 53 can be closed or opened to jet the air - flow 56. When the jet - rotating device 51 rotates to Figure 6 the position shown, the air - flow channel 53 is about to start jetting the air - flow; When the jet - rotating device 51 rotates to Figure 7 the position shown, the air - flow channel 53 is fully opened to jet the air - flow, and at this time the flow direction of the air - flow is as shown in Figure 9 ; When the jet - rotating device 51 rotates to Figure 8 the position shown, the air - flow channel 53 is closed and stops jetting the air - flow.

[0066] Embodiment 2

[0067] A texturing device for texturing thick - denier polyester industrial yarns, as shown in Figure 1As shown in the figure, it is composed of a main body layer 11, a non-removable plate 21, an upper cover layer 31, a removable plate 41 and a jet rotating device 51. The non-removable plate 21 and the removable plate 41 form an intermediate layer, and the upper cover layer 31, the intermediate layer and the main body layer 11 are arranged in sequence from top to bottom;

[0068] A tow channel 22 is arranged inside the intermediate layer. The extending direction of the tow channel 22 is parallel to the front-rear direction. The tow channel 22 is jointly surrounded by a left wall, a right wall, an upper wall and a lower wall. The left wall is composed of upper and lower parts. The lower part of the left wall is detachably connected to the lower wall. The removable plate 41 forms the lower part of the left wall. There is a gap between the lower part of the left wall and the upper part of the left wall, and this gap is the tow inlet 23; the right side surface of the left wall, the left side surface of the right wall and the lower surface of the upper wall are all flat surfaces, and the upper surface of the lower wall is a curved surface. This curved surface arches upward along the front-rear direction and arches downward along the left-right direction; the right side surface of the left wall and the left side surface of the right wall are both vertical surfaces, and the lower surface of the upper wall is a horizontal surface. The maximum distance between the lower surface of the upper wall and the upper surface of the lower wall is 12 mm, and the minimum distance between the lower surface of the upper wall and the upper surface of the lower wall is 9 mm;

[0069] An air pressure channel 12 is arranged inside the main body layer 11, and the air pressure channel 12 is located below the tow channel 22;

[0070] The jet rotating device 51 is installed at the junction of the tow channel 22 and the air pressure channel 12, as shown in Figure 2 and Figure 3 shown; an air flow channel 53 is arranged inside the jet rotating device 51. The air flow channel 53 is the only channel between the tow channel 22 and the air pressure channel 12. The extending direction of the air flow channel 53 is perpendicular to the left-right direction, and the extending direction of the air pressure channel 12 is parallel to the up-down direction; as shown in Figure 4 and Figure 5 shown, the jet rotating device 51 is composed of an annular boss 54 and a left convex handle, an elliptical ball 55, and a right convex handle 52 arranged in sequence along the left-right direction. The long axis of the elliptical ball 55 is parallel to the left-right direction. The central axis of the annular boss 54 coincides with the long axis of the elliptical ball 55. The annular boss 54 is fixedly sleeved on the elliptical ball. The width L2 of the annular boss 54 along the left-right direction is 8 mm, and the wall thickness L7 of the annular boss 54 is 1 mm. The air flow channel 53 is located inside the elliptical ball 55. The air flow channel 53 penetrates through the annular boss 54 and the elliptical ball 55 and passes through the center of the elliptical ball 55;

[0071] The length L4 of the jet rotating device 51 along the left-right direction is 18 mm, the long axis length L3 of the elliptical ball 55 is 10 mm, and the short axis length L5 of the elliptical ball 55 is 7 mm;

[0072] The air flow channel 53 is a cylindrical air flow channel. The diameter L1 of the cylindrical air flow channel is 6 mm. Both the left convex handle 54 and the right convex handle 52 are cylindrical structures, with their central axes parallel to the left - right direction and the same dimensions. The diameter L6 of the right convex handle 52 is 3 mm. The jet - rotating device 51 is a ceramic part with a smooth surface, and the surface roughness Ra value of the jet - rotating device 51 is 1.6 ± 0.4 μm.

[0073] The width of the tow channel 22 in the left - right direction is 7 mm, and the length of the tow channel 22 in the front - back direction is 45 mm.

[0074] There are a left groove and a right groove at the junction of the tow channel 22 and the compressed - air channel 12.

[0075] 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 55, and its size is larger than the whole formed by the left convex handle and the left end of the ellipsoid 55. The whole formed by the left convex handle and the left end of the ellipsoid 55 is embedded in the left groove, and the height of the gap between them in the up - down direction is 0.1 ± 0.01 mm.

[0076] 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 55, and its size is larger than the whole formed by the right convex handle 52 and the right end of the ellipsoid 55. The whole formed by the right convex handle 52 and the right end of the ellipsoid 55 is embedded in the right groove, and the height of the gap between them in the up - down direction is 0.1 ± 0.01 mm. The surfaces of the left groove and the right groove are smooth - treated, and the surface roughness Ra value of the left groove and the right groove is 0.9 ± 0.1 μm.

[0077] During installation, first place the jet - rotating device 51 into the cavity composed of the left groove, the right groove and the compressed - air channel 12, and then cover the non - detachable plate 21, the upper cover layer 31 and the detachable plate 41. The detachable plate 41 is located above the main body layer 11 and on one side of the non - detachable plate 21. 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. Also use fixing screws to lock the two layers of the detachable plate 41 and the main body layer 11. The function of the detachable plate 41 is to fix the lower part of the left wall of the tow channel 22. The installation method of the jet - rotating device 51 meets the requirement that when the tow 61 passes through the tow channel 22, it contacts the annular boss 54 and drives the jet - rotating device 51 to rotate around the central axis parallel to the left - right direction. Through the rotation of the jet - rotating device 51, the air flow channel 53 can be closed or opened to eject the air flow 56. When the jet - rotating device 51 rotates to Figure 6 the position shown, the air flow channel 53 is about to start ejecting the air flow; when the jet - rotating device 51 rotates to Figure 7 the position shown, the air flow channel 53 is fully opened to eject the air flow, and at this time the flow direction of the air flow is as shown in Figure 9 ; when the jet - rotating device 51 rotates to Figure 8When in the shown position, the air flow channel 53 is closed and the air jetting stops.

[0078] Embodiment 3

[0079] An air-jetting device for texturing thick denier polyester industrial yarns, as Figure 1 shown, is composed of a main body layer 11, a non-removable plate 21, an upper cover layer 31, a removable plate 41 and an air-jetting rotating device 51. The non-removable plate 21 and the removable plate 41 form an intermediate layer, and the upper cover layer 31, the intermediate layer and the main body layer 11 are arranged in sequence from top to bottom;

[0080] A tow channel 22 is arranged inside the intermediate layer. The extending direction of the tow channel 22 is parallel to the front-back direction. The tow channel 22 is jointly surrounded by a left wall, a right wall, an upper wall and a lower wall. The left wall consists of upper and lower parts. The lower part of the left wall is detachably connected to the lower wall. The removable plate 41 forms the lower part of the left wall. A gap is left between the lower part of the left wall and the upper part of the left wall, and this gap is the tow inlet 23. The right side surface of the left wall, the left side surface of the right wall and the lower surface of the upper wall are all flat surfaces, and the upper surface of the lower wall is a curved surface. This curved surface arches upward along the front-back direction and arches downward along the left-right direction. The right side surface of the left wall and the left side surface of the right wall are both vertical surfaces, and the lower surface of the upper wall is a horizontal surface. The maximum distance between the lower surface of the upper wall and the upper surface of the lower wall is 9 mm, and the minimum distance between the lower surface of the upper wall and the upper surface of the lower wall is 6 mm;

[0081] An air pressure channel 12 is arranged inside the main body layer 11. The air pressure channel 12 is located below the tow channel 22;

[0082] The air-jetting rotating device 51 is installed at the junction of the tow channel 22 and the air pressure channel 12, as Figure 2 and Figure 3 shown; An air flow channel 53 is arranged inside the air-jetting rotating device 51. The air flow channel 53 is the only channel between the tow channel 22 and the air pressure channel 12. The extending direction of the air flow channel 53 is perpendicular to the left-right direction, and the extending direction of the air pressure channel 12 is parallel to the up-down direction; as Figure 4 and Figure 5 shown, the air-jetting rotating device 51 is composed of an annular boss 54 and a left convex handle, an ellipsoid 55, a right convex handle 52 arranged in sequence along the left-right direction. The major axis of the ellipsoid 55 is parallel to the left-right direction. The central axis of the annular boss 54 coincides with the major axis of the ellipsoid. The annular boss 54 is fixedly sleeved on the ellipsoid. The width L2 of the annular boss 54 along the left-right direction is 6 mm, and the wall thickness L7 of the annular boss 54 is 2 mm. The air flow channel 53 is located inside the ellipsoid 55. The air flow channel 53 penetrates through the annular boss 54 and the ellipsoid 55 and passes through the center of the ellipsoid 55;

[0083] The length L4 of the jet rotating device 51 in the left - right direction is 14 mm, the major - axis length L3 of the ellipsoid 55 is 8 mm, and the minor - axis length L5 of the ellipsoid 55 is 5 mm;

[0084] The air - flow channel 53 is a cylindrical air - flow channel. The diameter L1 of the cylindrical air - flow channel is 4 mm. Both the left convex handle and the convex handle 52 are cylindrical structures, with their central axes parallel to the left - right direction and the same dimensions. The diameter L6 of the right convex handle 52 is 2 mm; The jet rotating device 51 is a ceramic part with a smooth surface, and the surface roughness Ra value of the jet rotating device 51 is 1.6 ± 0.4 μm;

[0085] The width of the tow channel 22 in the left - right direction is 5 mm, and the length of the tow channel 22 in the front - back direction is 35 mm;

[0086] There are a left groove and a right groove at the junction of the tow channel 22 and the compressed - air channel 12;

[0087] 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 55, and its size is larger than the whole formed by the left convex handle and the left end of the ellipsoid 55. The whole formed by the left convex handle and the left end of the ellipsoid 55 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;

[0088] 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 55, and its size is larger than the whole formed by the right convex handle 52 and the right end of the ellipsoid 55. The whole formed by the right convex handle 52 and the right end of the ellipsoid 55 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; The surfaces of the left groove and the right groove are smooth - treated, and the surface roughness Ra value of the left groove and the right groove is 0.9 ± 0.1 μm;

[0089] During installation, first place the jet rotating device 51 into the cavity composed of the left groove, the right groove and the compressed - air channel 12, and then cover the non - detachable plate 21, the upper cover layer 31 and the detachable plate 41. The detachable plate 41 is located above the main body layer 11 and on one side of the non - detachable plate 21. 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. Also use fixing screws to lock the two layers of the detachable plate 41 and the main body layer 11. The function of the detachable plate 41 is to fix the lower part of the left wall of the tow channel 22; The installation method of the jet rotating device 51 satisfies that when the tow 61 passes through the tow channel 22, it contacts the annular boss 54 and drives the jet rotating device 51 to rotate around the central axis parallel to the left - right direction. By the rotation of the jet rotating device 51, the air - flow channel 53 can be closed or opened to eject the air - flow 56. When the jet rotating device 51 rotates to Figure 6 the position shown, the air - flow channel 53 is about to start ejecting the air - flow; When the jet rotating device 51 rotates to Figure 7When in the position shown, the air flow channel 53 is fully opened to eject the air flow, and the flow direction of the air flow is as shown in Figure 9 ; when the jet rotating device 51 rotates to the position shown in Figure 8 , the air flow channel 53 is closed and the ejection of the air flow stops.

[0090] Example 4

[0091] A networker for adding network points to thick-denier polyester industrial yarns is basically the same as that in Example 1, except that: the two ports of the air flow channel are respectively the first port 531 and the second port 532, and both the first port 531 and the second port 532 are oval, as shown in Figure 10 and Figure 11 , and are respectively denoted as oval a and oval b. Oval b is formed by rotating oval a by 90° around the center. The air flow channel is a gradient structure, gradually changing from oval a to oval b, as shown in Figure 12 ; the minor axis length L11 of oval a is 3 mm, and the major axis length L12 of oval a is 5 mm.

[0092] Example 5

[0093] A networker for adding network points to thick-denier polyester industrial yarns is basically the same as that in Example 2, except that: the two ports of the air flow channel are respectively the first port 531 and the second port 532, and both the first port 531 and the second port 532 are oval, as shown in Figure 9 and Figure 10 , and are respectively denoted as oval a and oval b. Oval b is formed by rotating oval a by 90° around the center. The air flow channel is a gradient structure, as shown in Figure 12 , gradually changing from oval a to oval b; the minor axis length L11 of oval a is 2 mm, and the major axis length L12 of oval a is 4 mm.

[0094] Example 6

[0095] A networker for adding network points to thick-denier polyester industrial yarns is basically the same as that in Example 3, except that: the two ports of the air flow channel are respectively the first port 531 and the second port 532, and both the first port 531 and the second port 532 are oval, as shown in Figure 9 and Figure 10 , and are respectively denoted as oval a and oval b. Oval b is formed by rotating oval a by 90° around the center. The air flow channel is a gradient structure, as shown in Figure 12 , gradually changing from oval a to oval b; the minor axis length L11 of oval a is 4 mm, and the major axis length L12 of oval a is 6 mm.

[0096] Example 7

[0097] A method for dot-networking of thick-denier polyester industrial yarns, in which the yarn bundle passes through the yarn bundle channel of the dot-networker in Example 1, and compressed air is continuously introduced into the compressed air channel;

[0098] The yarn bundle is 4400 dtex / 488 f polyester high-strength industrial yarn, the winding speed is 2850 m / min, the winding tension is 600 cN, and the dot-networking pressure is 4.3 bar;

[0099] After the yarn bundle leaves the yarn bundle channel, the dot-networking density is 11 per meter, the number of coiled yarns is 0.0002 per meter, and the dot-networking fastness is 88%.

[0100] Example 8

[0101] A method for dot-networking of thick-denier polyester industrial yarns, in which the yarn bundle passes through the yarn bundle channel of the dot-networker in Example 2, and compressed air is continuously introduced into the compressed air channel;

[0102] The yarn bundle is 6600 dtex / 576 f polyester high-strength industrial yarn, the winding speed is 2600 m / min, the winding tension is 900 cN, and the dot-networking pressure is 4.5 bar;

[0103] After the yarn bundle leaves the yarn bundle channel, the dot-networking density is 15 per meter, the number of coiled yarns is 0.0004 per meter, and the dot-networking fastness is 86%.

[0104] Example 9

[0105] A method for dot-networking of thick-denier polyester industrial yarns, in which the yarn bundle passes through the yarn bundle channel of the dot-networker in Example 3, and compressed air is continuously introduced into the compressed air channel;

[0106] The yarn bundle is 8800 dtex / 976 f polyester high-strength industrial yarn, the winding speed is 2750 m / min, the winding tension is 1200 cN, and the dot-networking pressure is 4.0 bar;

[0107] After the yarn bundle leaves the yarn bundle channel, the dot-networking density is 12 per meter, the number of coiled yarns is 0.0003 per meter, and the dot-networking fastness is 83%.

[0108] Comparative Example 1

[0109] A method for dot-networking of thick-denier polyester industrial yarns is basically the same as that in Example 7, the only difference being that: the jet rotating device is not provided with an annular boss.

[0110] After the yarn bundle leaves the yarn bundle channel, the dot-networking density is 8 per meter, the number of coiled yarns is 0.0005 per meter, and the dot-networking fastness is 75%.

[0111] Comparative Example 2

[0112] A method for adding network points to thick-denier polyester industrial yarns is basically the same as that of Example 8, except that: the jet rotating device is not provided with an annular boss.

[0113] After the filament bundle leaves the filament bundle channel, the network degree is 9 per meter, the number of loop filaments is 0.0006 per meter, and the network fastness is 77%.

[0114] Comparative Example 3

[0115] A method for adding network points to thick-denier polyester industrial yarns is basically the same as that of Example 9, except that: the jet rotating device is not provided with an annular boss.

[0116] After the filament bundle leaves the filament bundle channel, the network degree is 10 per meter, the number of loop filaments is 0.0008 per meter, and the network fastness is 80%.

[0117] After comparison, the network degree of the filament bundles obtained in Comparative Examples 1-3 is 8-10 per meter, the number of loop filaments is 0.0005-0.0008 per meter, and the network fastness is 75-80%. The network degree of the filament bundles obtained in Examples 7-9 is 11-15 per meter, the number of loop filaments is 0.0002-0.0004 per meter, and the network fastness is 83%-88%. Compared with Comparative Examples 1-3, the network degree of the filament bundles obtained in Examples 7-9 is significantly improved, the number of loop filaments is significantly improved, and the network fastness is significantly increased. This shows that: for adding network points to thick-denier polyester industrial yarns, the annular boss of the jet rotating device has a certain effect, which can improve the network degree and network fastness and reduce the number of loop filaments. This is because the thick-denier polyester industrial yarn has a large fineness and a large number of filaments. When using a conventional networker to inject compressed air, the acting force of the compressed air is difficult to form a uniform high-frequency jitter and form a winding structure; while the jet rotating device is provided with an annular boss, when the thick-denier polyester industrial yarn passes through the networker, the filament bundle is laid on the upper and both sides of the annular boss. The laying thickness of the filament bundle above the annular boss is small, and the laying thickness of the filament bundle on both sides of the annular boss is large. When the air flow is ejected, the filament bundle above the annular boss is first impacted, realizing single-filament opening and winding and moving towards both sides of the annular boss. Part of the filament bundle on both sides of the annular boss returns to the upper part of the annular boss under the action of the reflux air pressure and is impacted by the ejected air flow again to form a new winding form. The flow direction of the air flow is as Figure 9 shown.

[0118] Example 10

[0119] A method for adding network points to thick-denier polyester industrial yarns is basically the same as that of Example 7, except that the networker is replaced with the networker of Example 4.

[0120] After the filament bundle leaves the filament bundle channel, the network degree is 18 per meter, the number of loop filaments is 0.0002 per meter, and the network fastness is 94%.

[0121] Example 11

[0122] A method for adding network points to thick denier polyester industrial yarns is basically the same as that of Example 8, except that the network device is replaced with the network device of Example 5.

[0123] After the tow leaves the tow channel, the network density is 15 per meter, the number of coiled filaments is 00001 per meter, and the network fastness is 93%.

[0124] Example 12

[0125] A method for adding network points to thick denier polyester industrial yarns is basically the same as that of Example 9, except that the network device is replaced with the network device of Example 6.

[0126] After the tow leaves the tow channel, the network density is 16 per meter, the number of coiled filaments is 0.0001 per meter, and the network fastness is 91%.

[0127] The network density of the tows obtained in Examples 10 - 12 is 15 - 18 per meter, the number of coiled filaments is 0.0001 - 0.0002 per meter, and the network fastness is 91% - 93%. The network density of the tows obtained in Examples 7 - 9 is 11 - 15 per meter, the number of coiled filaments is 0.0002 - 0.0004 per meter, and the network fastness is 83% - 88%. Compared with Examples 7 - 9, the network density and the number of coiled filaments of Examples 10 - 12 are better or unchanged, but the network fastness of the tows obtained in Examples 10 - 12 is significantly improved. This shows that: for adding network points to thick denier polyester industrial yarns, on the basis of setting the annular boss on the jet rotary device, the air flow channel being a gradually changing structure can further greatly improve the network fastness. Because of the change in the shape of the air flow channel, the air flow pattern impacting the tow obtains a periodic change, thereby periodically adjusting the range of the tow in the thick denier tow that is impacted by the air flow. The tow changes its movement trajectory in the periodic air flow pattern, changing the single high-frequency vibration state, which is conducive to generating an entanglement structure, and thus improving the network fastness.

Claims

1. A texturing device for texturing thick-denier polyester industrial yarns, which is internally provided with a tow channel and a compressed air channel. The extending direction of the tow channel is parallel to the front-back direction, and the compressed air channel is located below the tow channel. It is characterized in that, An air jet rotating device is also provided inside; The air jet rotating device is installed at the junction of the tow channel and the compressed air channel; An air flow channel is provided inside the air jet rotating device. The air flow channel is the only channel between the tow channel and the compressed air channel, and the extending direction of the air flow channel is perpendicular to the left-right direction; The air jet rotating device includes an annular boss and 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, the central axis of the annular boss coincides with the major axis of the ellipsoid, the annular boss is fixedly sleeved on the ellipsoid, and the air flow channel penetrates through the annular boss and the ellipsoid; The installation method of the air jet rotating device satisfies that when the tow passes through the tow 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.

2. The yarn texturing machine for texturing thick denier polyester industrial yarn according to claim 1, characterized in that Both ports of the air flow channel are elliptical, denoted as ellipse a and ellipse b respectively. Ellipse b is formed by rotating ellipse a by 90° around the center. The air flow channel is a gradually changing structure, gradually changing from ellipse a to ellipse b.

3. The yarn texturing device for texturing thick denier polyester industrial yarn according to claim 2, characterized in that, The minor axis length L11 of ellipse a is 2 - 4 mm, and the major axis length L12 of ellipse a is 4 - 6 mm.

4. The yarn texturing machine for texturing thick denier polyester industrial yarn according to claim 3, characterized in that, The length L4 of the air jet rotating device along the left-right direction is 14 - 18 mm, the width L2 of the annular boss along the left-right direction is 6 - 8 mm, the wall thickness L7 of the annular boss is 1 - 2 mm, the major axis length L3 of the ellipsoid is 8 - 10 mm, the minor axis length L5 of the ellipsoid is 5 - 7 mm. Both the left convex handle and the right convex handle are cylindrical structures, the central axis is parallel to the left-right direction and they have the same size. The diameter L6 of the right convex handle is 2 - 3 mm. The width of the tow channel along the left-right direction is 5 - 7 mm, and the length of the tow channel along the front-back direction is 35 - 45 mm.

5. The yarn texturing device for texturing coarse denier polyester industrial yarn according to claim 1, characterized in that, The air flow channel passes through the center of the ellipsoid.

6. The yarn texturing device for texturing thick denier polyester industrial yarn according to claim 1, characterized in that, The air jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2 - 2.0 μm; Left and right grooves are provided at the junction of the internal tow channel and the compressed air channel of the network device used for adding network points to thick denier polyester industrial yarns; The shape of the left groove is the same as the overall structure formed by the left convex handle and the left end of the ellipsoid, and its size is larger than the overall structure formed by the left convex handle and the left end of the ellipsoid. The overall structure formed by the left convex handle and the left end of the ellipsoid is embedded in the left groove, and the height of the gap between the two along the up-down direction is 0.05 - 0.1 mm; The shape of the right groove is the same as the overall structure formed by the right convex handle and the right end of the ellipsoid, and its size is larger than the overall structure formed by the right convex handle and the right end of the ellipsoid. The overall structure formed by the right convex handle and the right end of the ellipsoid is embedded in the right groove, and the height of the gap between the two along the up-down direction is 0.05 - 0.1 mm; The surfaces of the left and right grooves are subjected to smooth treatment, and the surface roughness Ra value is 0.8 - 1.0 μm.

7. The yarn texturing machine for texturing thick denier polyester industrial yarn according to claim 1, characterized in that, The extending direction of the compressed air channel is parallel to the up-down direction.

8. The texturing device for texturing coarse denier polyester industrial yarn according to claim 1, wherein The air-jet texturing device for coarse denier polyester industrial yarn is divided into an upper cover layer, a middle layer, and a main body layer arranged in sequence from top to bottom. The filament bundle channel is arranged in the middle layer, and the compressed air channel is arranged in the main body layer. The filament bundle channel is jointly surrounded by a left wall, a right wall, an upper wall, and a lower wall. The left wall is composed of upper and lower parts. The lower part of the left wall is detachably connected to the lower wall, and there is a gap between the lower part of the left wall and the upper part of the left wall. This gap is the filament bundle inlet.

9. The yarn texturing device for texturing thick denier polyester industrial yarn according to claim 8, characterized in that, The right side surface of the left wall, the left side surface of the right wall, and the lower surface of the upper wall are all flat surfaces, and the upper surface of the lower wall is a curved surface. Along the front-back direction, this curved surface arches upward, and along the left-right direction, this curved surface arches downward; the right side surface of the left wall and the left side surface of the right wall are both vertical surfaces, and the lower surface of the upper wall is a horizontal surface. The maximum distance between the lower surface of the upper wall and the upper surface of the lower wall is 9 - 12 mm, and the minimum distance between the lower surface of the upper wall and the upper surface of the lower wall is 6 - 9 mm.

10. A method for adding network points to thick-denier polyester industrial yarns, characterized in that, Using the air-jet texturing device for coarse denier polyester industrial yarn according to any one of claims 1 to 9, pass the coarse denier polyester industrial yarn through the filament bundle channel and continuously introduce compressed air into the compressed air channel; The specification of the coarse denier polyester industrial yarn is 4400 - 8800 dtex / 488 - 976 f, the winding speed is 2600 - 2850 m / min, the winding tension is 600 - 1200 cN, the texturing pressure is 4.0 - 4.5 bar. After the filament bundle leaves the filament bundle channel, the texturing degree is 11 - 18 pieces / meter, the number of coiled filaments is 0.0001 - 0.0004 pieces / meter, and the texturing fastness is 83 - 93%.

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