Method for making network points on coarse denier polyester industrial yarn and used network device

Abstract

The invention belongs to the technical field of spinning, and relates to a method for dotting network points on coarse denier polyester industrial yarn and a used network device. An interlacer for interlacing coarse denier polyester industrial yarn is internally provided with a tow channel, a compressed air channel and an air injection rotating device, and the air injection rotating device is installed at the junction of the tow channel and the compressed air channel; the air injection rotating device comprises an annular boss, a left convex handle, an elliptical ball and a right convex handle, and the elliptical ball is fixedly sleeved with the annular boss; an air flow channel is formed in the air injection rotating device and penetrates through the annular boss and the elliptical ball; when the tows penetrate through the tow channel, the tows make contact with the annular boss and drive the air injection rotating device to rotate. According to the method for making the interlaced points on the coarse denier polyester industrial yarn, the coarse denier polyester industrial yarn penetrates through the tow channel of the interlacing device, and compressed air is continuously introduced into the compressed air channel. The interlacer and the interlacing method solve the problem of difficulty in interlacing of the coarse denier polyester yarns, and are suitable for large-scale application.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a method for making network points for coarse-denier polyester industrial yarn and a network device used therefor. 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. At present, the fineness of polyester industrial yarn produced by one-step method is between 75D-8000D. Among them, the production of coarse denier polyester industrial yarn above 4000D needs to be produced by plying method, and then networked by networker, and finally form a tow with certain network points and network degree (network point is the structure between the single filaments on the tow that is tightly entangled and not easy to loosen. The number of entangled structures per meter on the tow is called network degree. The higher the network degree, the better the cohesion of the tow).

[0003] The existing network devices are mainly divided into two types, one is a continuous jet of airflow, and the other is an intermittent jet of airflow. The structure of the network device with continuous jet of airflow is simple and easy to operate, but due to the large fineness of coarse denier polyester industrial yarn, when using the network device with continuous jet of airflow, a larger air pressure is required to make a firm network point, but when the pressure is too high, the number of network points will no longer increase significantly, and the higher the vibration frequency of the tow in the network device, the stronger the impact, which can easily cause the single filament to be blown off or unevenly stretched, thus showing as looped wire, and it is difficult to meet the two requirements of no looped wire in the tow and high network fastness. The intermittent jet airflow network device adds an intermittent airflow control device at the front end of the network device, which can accurately mark the points, is not prone to producing loops and saves compressed air costs. However, the airflow cutoff point of the intermittent jet airflow is far away from the filament bundle end, which can easily cause the airflow to be cut off before reaching the filament bundle end when the high-frequency airflow is jetted, resulting in a decrease in impact pressure, especially for coarse denier polyester industrial yarns. Since the diameter of the filament bundle is thicker and the airflow path is longer, the single yarn far from the airflow jet port is more significantly affected by the drop in impact pressure, resulting in unstable network points of the filament bundle and low network fastness.

[0004] Patent CN209537712U discloses a winding device capable of improving the network degree of coarse denier yarn, which includes a main network device and a backup network device, through which the coarse denier yarn is networked for the first time, and then through the backup network device, the coarse denier yarn is networked for the second time; the disadvantage is that although the two-network method can increase the network points without increasing the network pressure, the double network device does not improve the problem of large yarn bundle jitter caused by increased compressed air, and the double network device also fails to improve the network method, which is not conducive to the formation of firm network points of coarse denier polyester industrial yarn. In addition, the compressed air flow consumed by the double network device is doubled, which is not conducive to saving compressed air and energy consumption.

[0005] Therefore, it is necessary to develop a method for making network dots of coarse denier polyester industrial yarn and a network device for use which can improve network fastness and save compressed air. Summary of the invention

[0006] The purpose of the invention is to solve the problems existing in the prior art and to provide a method for making network dots of coarse denier polyester industrial yarn and a network device used therein.

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

[0008] A networker used for thick denier polyester industrial yarn network points, with a tow channel and a compressed air channel inside, the extension direction of the tow channel is parallel to the front-back direction, the compressed air channel is located below the tow 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, and the air flow channel is the only channel between the tow channel and the compressed air channel, and the extension direction of the air flow channel is perpendicular to the left and right direction;

[0011] The jet rotating device comprises an annular boss and a left boss, an elliptical ball, and a right boss arranged in sequence along the left and right directions. The long axis of the elliptical ball is parallel to the left and right directions. The central axis of the annular boss coincides with the long axis of the elliptical ball. The annular boss is fixedly sleeved on the elliptical ball, and the air flow channel runs through the annular boss and the elliptical ball.

[0012] The installation method of the jet rotating device satisfies that when the tow 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.

[0013] The jet airflow impacts the tow in the tow channel, and the tow generates high-frequency vibration. The airflow in the tow channel generates turbulence due to the high-frequency vibration of the tow, especially for coarse-denier polyester industrial yarn, the tow has a large number of filaments, and severe turbulence is not conducive to the loosening and entanglement between the filaments of the tow, so it is not easy to generate network points; the jet rotating device is provided with an annular boss, and when the coarse-denier polyester industrial yarn passes through the network device, the tow is laid on the top and both sides of the annular boss, the layer thickness of the tow above the annular boss is smaller, and the layer thickness of the tow on both sides of the annular boss is thicker. When the airflow is large, the filament bundles above the annular boss are first impacted by the high-pressure airflow, which realizes the loosening and winding of the single filaments and moves to the two sides of the annular boss. The filament bundles on both sides of the annular boss return to the top of the annular boss under the action of the reflux air pressure and are impacted by the jet airflow again to form a new winding form. When there is no annular boss, the thickness of the coarse denier polyester industrial yarn in the jet port area of ​​the airflow channel is large, and the airflow is not easy to penetrate the filament bundles forward. Instead, it is easier to form turbulence, which reduces the probability of forming network points and also reduces the network strength.

[0014] As the preferred technical solution:

[0015] As described above, in a network device used for a coarse denier polyester industrial yarn network point, the two ports of the air flow channel are both elliptical, respectively denoted as ellipse a and ellipse b, and ellipse b is formed by rotating ellipse a 90° around the center, and the air flow channel is a gradual structure, gradually changing from ellipse a to ellipse b.

[0016] The reason why coarse denier industrial yarns are not easy to form a network is that the yarn bundles have large fineness and many yarns, and it is not easy to achieve an entangled structure by high-frequency vibration in a network device. Therefore, the present invention changes the airflow pattern that impacts the yarn bundles, and then changes the single high-frequency vibration state, so that the yarn bundles change their motion trajectory in the periodic airflow pattern, thereby generating an entangled structure.

[0017] In the network device used for making network points of thick denier polyester industrial yarn as described above, the minor axis length L11 of the ellipse a is 2-4 mm, and the major axis length L12 of the ellipse a is 4-6 mm.

[0018] As described above, a network device used for making network points of coarse denier polyester industrial yarn, the length L4 of the jet rotating device along the left-right direction is 14-18mm, the width L2 of the annular boss along the left-right direction is 6-8mm, the wall thickness L7 of the annular boss is 1-2mm, the major axis length L3 of the ellipsoidal sphere is 8-10mm, the minor axis length L5 of the ellipsoidal sphere is 5-7mm, the left and right convex handles are both cylindrical structures, the central axes are parallel to the left-right directions and the size is the same, the diameter L6 of the right convex handle is 2-3mm, the width of the filament bundle channel along the left-right direction is 5-7mm, and the length of the filament bundle channel along the front-back direction is 35-45mm.

[0019] In the networker used for the network points of the coarse denier polyester industrial yarn as described above, the air flow channel passes through the center of the ellipsoidal ball.

[0020] In the above-mentioned networker used for network points of coarse denier polyester industrial yarn, 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 a coarse denier polyester industrial yarn network point as described above, wherein a left groove and a right groove are provided at the junction of an internal tow channel and a compressed air channel of the networker for use in a coarse denier polyester industrial yarn network point;

[0022] 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, and the size is larger than the whole formed by the left convex handle and the left end of the elliptical ball. The whole formed by the left convex handle and the left end of the elliptical ball 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 the whole formed by the right convex handle and the right end of the elliptical ball, and the size is larger than the whole formed by the right convex handle and the right end of the elliptical ball. The whole formed by the right convex handle and the right end of the elliptical ball 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 network device used for network points of coarse denier polyester industrial yarn as described above, the extension direction of the compressed air channel is parallel to the up-down direction.

[0026] The network device used in the coarse denier polyester industrial yarn network beating point as described above is divided into an upper cover layer, a middle layer, and a main body layer which are 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 yarn bundle channel is surrounded by a left wall, a right wall, an upper wall, and a lower wall. The left wall is composed of an upper and lower part. The lower part of the left wall is detachably connected to the lower wall. A gap is left between the lower part of the left wall and the upper part of the left wall, and the gap is the yarn bundle entrance.

[0027] As described above, the network device used for the network points of coarse denier polyester industrial yarn has the right side of the left wall, the left side of the right wall, and the lower surface of the upper wall all being planes, and the upper surface of the lower wall being a curved surface, which is arched upward along the front-to-back direction and arched downward along 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 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 9-12mm, and the minimum distance between the lower surface of the upper wall and the upper surface of the lower wall is 6-9mm.

[0028] The present invention also provides a method for making a network point for coarse denier polyester industrial yarn, using a network device for making a network point for coarse denier polyester industrial yarn as described in any of the above items, passing the coarse denier polyester industrial yarn through a yarn bundle channel, and continuously introducing compressed air into the compressed air channel.

[0029] As the preferred technical solution:

[0030] As described above, a method for making network dots on coarse denier polyester industrial yarn has a specification of 4400-8800dtex / 488-976f, a winding speed of 2600-2850m / min, a winding tension of 600-1200cN, a network pressure of 4.0-4.5bar, and after the tow leaves the tow channel, the network degree is 11-18 pieces / meter, the number of loops is 0.0001-0.0004 pieces / meter, and the network fastness is 83-93%.

[0031] Beneficial effects:

[0032] (1) The jet rotating device of the network device of the present invention is provided with an annular boss. When the coarse denier polyester industrial yarn passes through the network device, the yarn bundles are laid on the top and both sides of the annular boss. The laying thickness of the yarn bundles on the top of the annular boss is smaller, and the laying thickness of the yarn bundles on both sides of the annular boss is larger. When the airflow is jetted, the yarn bundles on the top of the annular boss are first impacted by the high-pressure airflow, so that the single yarn is loosened and wound and moves to both sides of the annular boss. The yarn bundles on both sides of the annular boss return to the top of the annular boss under the action of the reflux air pressure and are impacted by the jet airflow again to form a new winding form, which is conducive to the formation of a firm network point of the coarse denier polyester industrial yarn and solves the problem of difficulty in making a network for the coarse denier polyester yarn.

[0033] (2) The network device of the present invention uses intermittent injection of compressed air, which can save compressed air, is beneficial to energy saving and consumption reduction, and is suitable for large-scale applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 13D schematic diagram of the network device of Embodiments 1-3 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 top view schematic diagram of the main layer of the network device of Embodiments 1-3 of the present invention;

[0037] Figure 4 2 is a front structural schematic diagram of the jet rotating device of the network device of Embodiment 1-3 of the present invention;

[0038] Figure 5 1 is a schematic diagram of the side structure of the jet rotating device of the network device of Embodiment 1-3 of the present invention;

[0039] Figure 6 is a schematic diagram of the position of the air flow channel of the network device of Examples 1-3 of the present invention before the start of air jetting;

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

[0041] Figure 8 is a schematic diagram of the position of the airflow channel of the network device of Examples 1-3 of the present invention when the air jet ends;

[0042] Fig. 9 is a schematic diagram of airflow of the network device of Embodiments 1-3 of the present invention;

[0043] Fig.10 : is a schematic diagram of the structure of the jet rotating device of the network device of Embodiment 4-6 of the present invention (the air flow channel is a gradual structure, and the first port 531 of the air flow channel is an ellipse a);

[0044] Fig.11 : is a schematic diagram of the structure of the jet rotating device of the network device of Embodiment 4-6 of the present invention (the air flow channel is a gradual structure, and the second port 532 of the air flow channel is an elliptical shape b);

[0045] Fig.12 Schematic diagram of the structure of the airflow channel of the network device of Embodiment 4-6 of the present invention (the airflow channel is a gradual structure, the first port 531 of the airflow channel is an ellipse a, and the second port 532 of the airflow channel is an ellipse b);

[0046] Among them, 11 is the main layer, 12 is the compressed air channel, 21 is the non-detachable plate, 22 is the filament channel, 23 is the filament inlet, 31 is the upper cover layer, 41 is the detachable plate, 51 is the jet rotating device, 52 is the right convex handle, 53 is the airflow channel, 531 is the first port of the airflow channel, 532 is the second port of the airflow channel, 54 is the annular boss, 55 is the ellipsoidal sphere, 56 is the airflow, 61 is the filament bundle, L1 is the diameter of the cylindrical airflow channel, L2 is the width of the annular boss along the left and right directions, L3 is the major axis length of the ellipsoidal sphere, L4 is the length of the jet rotating device along the left and right directions, L5 is the minor axis length of the ellipsoidal sphere, 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 DESCRIPTION

[0047] 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.

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

[0049] 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.

[0050] Network fastness: Under the condition of applying a certain tension on the network yarn, the network fastness of the yarn is tested. The ratio of the network fastness after the tension is applied to the network fastness before the tension is applied is the network fastness. The specific method is: use polyester industrial yarn to test on the needle punching instrument, test the network fastness three times without adding tension, take the average value, then add a tension of 0.2cN / dtex to test the network fastness three times, take the average value, and the ratio of the average network fastness after the tension is applied to the average network fastness before the tension is applied is the network fastness.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Example 1

[0055] A networker for use in network points of coarse denier polyester industrial yarn, such as Figure 1 As shown, it is composed of a main body layer 11, a non-detachable plate 21, an upper cover layer 31, a detachable plate 41 and an air jet rotating device 51, the non-detachable plate 21 and the detachable 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] A tow channel 22 is provided inside the middle layer, and the extension direction of the tow channel 22 is parallel to the front-to-back direction. The tow channel 22 is surrounded by a left wall, a right wall, an upper wall and a lower wall. The left wall is composed of an upper and a lower part. The lower part of the left wall is detachably connected to the lower wall. A detachable plate 41 constitutes 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 the gap is a 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 planes, and the upper surface of the lower wall is a curved surface, which is arched upward along the front-to-back direction and arched downward along the left-to-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 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] A compressed air channel 12 is provided in the main body layer 11, and the compressed air channel 12 is located below the tow channel 22;

[0058] The jet rotating device 51 is installed at the junction of the tow channel 22 and the compressed air channel 12. Figure 2 and Figure 3 As shown; the jet rotating device 51 is provided with an air flow channel 53, the air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12, the extension direction of the air flow channel 53 is perpendicular to the left and right direction, and the extension direction of the compressed air channel 12 is parallel to the up and down direction; as Figure 4 and Figure 5 As shown, the jet rotating device 51 is composed of an annular boss 54 and a left boss, a right boss 52 and an elliptical ball 55 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 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 airflow channel 53 is located in the elliptical ball 55, and the airflow channel 53 passes through the annular boss 54 and the elliptical ball 55 and passes through the center of the elliptical ball 55.

[0059] The length L4 of the jet rotating device 51 in 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 airflow channel 53 is a cylindrical airflow channel, and the diameter L1 of the cylindrical airflow channel is 5 mm. The right lug 52 and the left lug 52 are both cylindrical structures, with the central axis parallel to the left and right directions and the same size. The diameter L6 of the right lug 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.

[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] A left groove and a right groove are provided at the junction of the tow channel 22 and the compressed air channel 12;

[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 elliptical ball 55, and the size is larger than the whole formed by the left convex handle and the left end of the elliptical ball 55. The whole formed by the left convex handle and the left end of the elliptical ball 55 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.08±0.01mm;

[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 elliptical ball 55, and the size is larger than the whole formed by the right convex handle 52 and the right end of the elliptical ball 55. The whole formed by the right convex handle 52 and the right end of the elliptical ball 55 is embedded in the right groove, and the height of the gap between the two along the vertical direction is 0.08±0.01mm; the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value of the left groove and the right groove is 0.9±0.1μm;

[0065] During installation, the jet rotating device 51 is first placed in the cavity composed of the left groove, the right groove and the compressed air channel 12, and then covered with the non-removable plate 21, the upper cover layer 31 and the removable plate 41. The removable plate 41 is located above the main body layer 11 and on one side of the non-removable plate 21. 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 and the main body layer 11 are also locked with fixing screws. The function of the removable 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: 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 and right directions. The rotation of the jet rotating device 51 can close or open the airflow channel 53 to eject the airflow 56. When the jet rotating device 51 rotates to Figure 6 When the airflow channel 53 is in the position shown, the airflow channel 53 is about to start to spray airflow; when the jet rotating device 51 rotates to Figure 7 When the position is shown, the air flow channel 53 is fully opened to spray air flow, and the flow direction of the air flow is as follows: Fig. 9 When the jet rotating device 51 rotates to Figure 8 In the position shown, the air flow channel 53 is closed and the jet air flow is stopped.

[0066] Example 2

[0067] A networker for use in network points of coarse denier polyester industrial yarn, such as Figure 1As shown, it is composed of a main body layer 11, a non-detachable plate 21, an upper cover layer 31, a detachable plate 41 and an air jet rotating device 51, the non-detachable plate 21 and the detachable 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 provided inside the middle layer, and the extension direction of the tow channel 22 is parallel to the front-to-back direction. The tow channel 22 is surrounded by a left wall, a right wall, an upper wall and a lower wall. The left wall is composed of an upper and a lower part. The lower part of the left wall is detachably connected to the lower wall. A detachable plate 41 constitutes 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 the gap is a 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 planes, and the upper surface of the lower wall is a curved surface, which is arched upward along the front-to-back direction and arched downward along the left-to-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] A compressed air channel 12 is provided in the main body layer 11, and the compressed air 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 compressed air channel 12. Figure 2 and Figure 3 As shown; the jet rotating device 51 is provided with an air flow channel 53, the air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12, the extension direction of the air flow channel 53 is perpendicular to the left and right direction, and the extension direction of the compressed air channel 12 is parallel to the up and down direction; as Figure 4 and Figure 5 As shown, the jet rotating device 51 is composed of an annular boss 54 and a left boss, an elliptical ball 55, and a right boss 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. The wall thickness L7 of the annular boss 54 is 1 mm. The airflow channel 53 is located in the elliptical ball 55. The airflow channel 53 passes 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 in the left-right direction is 18 mm, the major axis length L3 of the ellipsoid 55 is 10 mm, and the minor axis length L5 of the ellipsoid 55 is 7 mm;

[0072] The airflow channel 53 is a cylindrical airflow channel, and the diameter L1 of the cylindrical airflow channel is 6 mm. The left lug 54 and the right lug 52 are both cylindrical structures, with the central axis parallel to the left and right directions and the same size. The diameter L6 of the right lug 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] A left groove and a right groove are provided 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 elliptical ball 55, and the size is larger than the whole formed by the left convex handle and the left end of the elliptical ball 55. The whole formed by the left convex handle and the left end of the elliptical ball 55 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.1±0.01mm;

[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 elliptical ball 55, and the size is larger than the whole formed by the right convex handle 52 and the right end of the elliptical ball 55. The whole formed by the right convex handle 52 and the right end of the elliptical ball 55 is embedded in the right groove, and the height of the gap between the two along the vertical direction is 0.1±0.01mm; the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value of the left groove and the right groove is 0.9±0.1μm;

[0077] During installation, the jet rotating device 51 is first placed in the cavity composed of the left groove, the right groove and the compressed air channel 12, and then covered with the non-removable plate 21, the upper cover layer 31 and the removable plate 41. The removable plate 41 is located above the main body layer 11 and on one side of the non-removable plate 21. 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 and the main body layer 11 are also locked with fixing screws. The function of the removable 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: 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 and right directions. The rotation of the jet rotating device 51 can close or open the airflow channel 53 to eject the airflow 56. When the jet rotating device 51 rotates to Figure 6 When the airflow channel 53 is in the position shown, the airflow channel 53 is about to start to spray airflow; when the jet rotating device 51 rotates to Figure 7 When the position is shown, the air flow channel 53 is fully opened to spray air flow, and the flow direction of the air flow is as follows: Fig. 9 When the jet rotating device 51 rotates to Figure 8In the position shown, the air flow channel 53 is closed and the jet air flow is stopped.

[0078] Example 3

[0079] A networker for use in network points of coarse denier polyester industrial yarn, such as Figure 1 As shown, it is composed of a main body layer 11, a non-detachable plate 21, an upper cover layer 31, a detachable plate 41 and an air jet rotating device 51, the non-detachable plate 21 and the detachable 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 provided inside the middle layer, and the extension direction of the tow channel 22 is parallel to the front-to-back direction. The tow channel 22 is surrounded by a left wall, a right wall, an upper wall and a lower wall. The left wall is composed of an upper and a lower part. The lower part of the left wall is detachably connected to the lower wall. A detachable plate 41 constitutes 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 the gap is a 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 planes, and the upper surface of the lower wall is a curved surface, which is arched upward along the front-to-back direction and arched downward along the left-to-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] A compressed air channel 12 is provided in the main body layer 11, and the compressed air channel 12 is located below the tow channel 22;

[0082] The jet rotating device 51 is installed at the junction of the tow channel 22 and the compressed air channel 12. Figure 2 and Figure 3 As shown; the jet rotating device 51 is provided with an air flow channel 53, the air flow channel 53 is the only channel between the tow channel 22 and the compressed air channel 12, the extension direction of the air flow channel 53 is perpendicular to the left and right direction, and the extension direction of the compressed air channel 12 is parallel to the up and down direction; as Figure 4 and Figure 5 As shown, the jet rotating device 51 is composed of an annular boss 54 and a left boss, an elliptical ball 55, and a right boss 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. 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 6 mm, and the wall thickness L7 of the annular boss 54 is 2 mm. The airflow channel 53 is located in the elliptical ball 55, and the airflow channel 53 passes through the annular boss 54 and the elliptical ball 55 and passes through the center of the elliptical ball 55.

[0083] The length L4 of the jet rotating device 51 along 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 airflow channel 53 is a cylindrical airflow channel, and the diameter L1 of the cylindrical airflow channel is 4 mm. The left lug and the lug 52 are both cylindrical structures, with the central axis parallel to the left and right directions and the same size. The diameter L6 of the right lug 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] A left groove and a right groove are provided 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 elliptical ball 55, and the size is larger than the whole formed by the left convex handle and the left end of the elliptical ball 55. The whole formed by the left convex handle and the left end of the elliptical ball 55 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05±0.01mm;

[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 elliptical ball 55, and the size is larger than the whole formed by the right convex handle 52 and the right end of the elliptical ball 55. The whole formed by the right convex handle 52 and the right end of the elliptical ball 55 is embedded in the right groove, and the height of the gap between the two along the vertical direction is 0.05±0.01mm; the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value of the left groove and the right groove is 0.9±0.1μm;

[0089] During installation, the jet rotating device 51 is first placed in the cavity composed of the left groove, the right groove and the compressed air channel 12, and then covered with the non-removable plate 21, the upper cover layer 31 and the removable plate 41. The removable plate 41 is located above the main body layer 11 and on one side of the non-removable plate 21. 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 and the main body layer 11 are also locked with fixing screws. The function of the removable 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: 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 and right directions. The rotation of the jet rotating device 51 can close or open the airflow channel 53 to eject the airflow 56. When the jet rotating device 51 rotates to Figure 6 When the airflow channel 53 is in the position shown, the airflow channel 53 is about to start to spray airflow; when the jet rotating device 51 rotates to Figure 7When the position is shown, the air flow channel 53 is fully opened to spray air flow, and the flow direction of the air flow is as follows: Fig. 9 When the jet rotating device 51 rotates to Figure 8 In the position shown, the air flow channel 53 is closed and the jet air flow is stopped.

[0090] Example 4

[0091] A network device for thick denier polyester industrial yarn network points is basically the same as that of embodiment 1, except that: the two ports of the air flow channel are respectively a first port 531 and a second port 532, and the first port 531 and the second port 532 are both elliptical, such as Fig.10 and Fig.11 As shown, they are respectively marked as ellipse a and ellipse b. Ellipse b is formed by rotating ellipse a 90° around the center. The air flow channel is a gradual structure, gradually changing from ellipse a to ellipse b, as shown in FIG. Fig.12 As shown; the minor axis length L11 of the ellipse a is 3 mm, and the major axis length L12 of the ellipse a is 5 mm.

[0092] Example 5

[0093] A network device for a coarse denier polyester industrial yarn network point is basically the same as that in Example 2, except that: the two ports of the air flow channel are respectively a first port 531 and a second port 532, and the first port 531 and the second port 532 are both elliptical, such as Fig. 9 and Fig.10 As shown, they are respectively denoted as ellipse a and ellipse b. Ellipse b is formed by rotating ellipse a 90° around the center. The airflow channel is a gradual structure, such as Fig.12 As shown, the ellipse a gradually changes into the ellipse b; the short axis length L11 of the ellipse a is 2 mm, and the long axis length L12 of the ellipse a is 4 mm.

[0094] Example 6

[0095] A network device for thick denier polyester industrial yarn network points is basically the same as that of embodiment 3, except that: the two ports of the air flow channel are respectively a first port 531 and a second port 532, and the first port 531 and the second port 532 are both elliptical, such as Fig. 9 and Fig.10 As shown, they are respectively denoted as ellipse a and ellipse b. Ellipse b is formed by rotating ellipse a 90° around the center. The airflow channel is a gradual structure, such as Fig.12 As shown, the ellipse a gradually changes into the ellipse b; the short axis length L11 of the ellipse a is 4 mm, and the long axis length L12 of the ellipse a is 6 mm.

[0096] Example 7

[0097] A method for making a network dot on a coarse denier polyester industrial yarn, wherein the yarn bundle passes through the yarn bundle channel of the network device of Example 1, and compressed air is continuously introduced into the compressed air channel;

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

[0099] After the tow leaves the tow channel, the network density is 11 pieces / m, the number of loops is 0.0002 pieces / m, and the network fastness is 88%.

[0100] Example 8

[0101] A method for making a network dot on a coarse denier polyester industrial yarn, wherein the yarn bundle passes through the yarn bundle channel of the network device of Example 2, and compressed air is continuously introduced into the compressed air channel;

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

[0103] After the tow leaves the tow channel, the network density is 15 / m, the number of loops is 0.0004 / m, and the network fastness is 86%.

[0104] Example 9

[0105] A method for making a network dot on a coarse denier polyester industrial yarn, wherein the yarn bundle passes through the yarn bundle channel of the network device of Example 3, and compressed air is continuously introduced into the compressed air channel;

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

[0107] After the tow leaves the tow channel, the network density is 12 per meter, the number of loops is 0.0003 per meter, and the network fastness is 83%.

[0108] Comparative Example 1

[0109] A method for making interlaced dots on coarse denier polyester industrial yarn is basically the same as that of Example 7, except that the jet rotating device is not provided with an annular boss.

[0110] After the tow leaves the tow channel, the network density is 8 per meter, the number of loops is 0.0005 per meter, and the network fastness is 75%.

[0111] Comparative Example 2

[0112] A method for making interlaced dots on coarse denier polyester industrial yarn 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 tow leaves the tow channel, the network density is 9 per meter, the number of loops is 0.0006 per meter, and the network fastness is 77%.

[0114] Comparative Example 3

[0115] A method for making interlaced dots on coarse denier polyester industrial yarn 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 tow leaves the tow channel, the network density is 10 / m, the number of loops is 0.0008 / m, and the network fastness is 80%.

[0117] By comparison, the network degree of the tow obtained in Comparative Examples 1-3 is 8-10 per meter, the number of loops is 0.0005-0.0008 per meter, and the network fastness is 75-80%. The network degree of the tow obtained in Examples 7-9 is 11-15 per meter, the number of loops 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 tow obtained in Examples 7-9 is significantly improved, the number of loops is significantly improved, and the network fastness is significantly improved. This shows that: for the network points of coarse denier polyester industrial yarn, 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 yarns. This is because the coarse denier polyester industrial yarn has a large fineness and a large number of yarns. When using a conventional network device to spray compressed air, the 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 coarse denier polyester industrial yarn passes through the network device, the yarn bundles are laid on the top and both sides of the annular boss. The layer thickness of the yarn bundles above the annular boss is small, and the layer thickness of the yarn bundles on both sides of the annular boss is large. When the airflow is sprayed, the yarn bundles above the annular boss are impacted first, realizing the loosening and winding of the single yarn and moving to the sides of the annular boss. The yarn bundles on both sides of the annular boss return to the top of the annular boss under the action of the reflux air pressure and are impacted by the jet airflow again to form a new winding form. The flow direction of the airflow is as follows Fig. 9 shown.

[0118] Example 10

[0119] A method for making network dots on coarse denier polyester industrial yarn is basically the same as that in Example 7, except that the network device is replaced by the network device in Example 4.

[0120] After the tow leaves the tow channel, the network density is 18 per meter, the number of loops is 0.0002 per meter, and the network fastness is 94%.

[0121] Embodiment 11

[0122] A method for making network dots on coarse denier polyester industrial yarn is basically the same as that in Example 8, except that the network device is replaced by the network device in Example 5.

[0123] After the tow leaves the tow channel, the network density is 15 / m, the number of loops is 00001 / m, and the network fastness is 93%.

[0124] Example 12

[0125] A method for making network dots on coarse denier polyester industrial yarn is basically the same as that in Example 9, except that the network device is replaced by the network device in Example 6.

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

[0127] The network density of the yarn bundles obtained in Examples 10-12 is 15-18 pcs / m, the number of loops is 0.0001-0.0002 pcs / m, and the network fastness is 91%-93%. The network density of the yarn bundles obtained in Examples 7-9 is 11-15 pcs / m, the number of loops is 0.0002-0.0004 pcs / m, and the network fastness is 83%-88%. Compared with Examples 7-9, the network degree and the number of loops in Examples 10-12 are better or unchanged, but the network fastness of the tow obtained in Examples 10-12 is significantly improved, which means that for the network points of coarse denier polyester industrial yarn, the jet rotating device, on the basis of setting an annular boss, has a gradient structure of the air flow channel, which can further significantly improve the network fastness. Because of the change in the shape of the air flow channel, the airflow pattern that impacts the tow is periodically changed, and then the range of the tow impacted by the airflow in the coarse denier tow is periodically adjusted. The tow changes its motion trajectory in the periodic airflow pattern, changes the single high-frequency vibration state, and is conducive to the generation of an entangled structure, thereby improving the network fastness.

Claims

1. A network device for thick denier polyester industrial yarn network points, 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, and the air flow channel is the only channel between the tow channel and the compressed air channel, and the extension direction of the air flow channel is perpendicular to the left and right direction; The jet rotating device comprises an annular boss and a left boss, an elliptical ball, and a right boss arranged in sequence along the left and right directions. The long axis of the elliptical ball is parallel to the left and right directions. The central axis of the annular boss coincides with the long axis of the elliptical ball. The annular boss is fixedly sleeved on the elliptical ball, and the air flow channel runs through the annular boss and the elliptical ball. The installation method of the jet rotating device satisfies that when the tow 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 used for the network point of thick denier polyester industrial yarn according to claim 1, characterized in that: Both ends of the airflow channel are elliptical, respectively denoted as ellipse a and ellipse b. Ellipse b is formed by rotating ellipse a 90° around the center. The airflow channel is a gradual structure, gradually changing from ellipse a to ellipse b.

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

4. The network device used for the network point of thick denier polyester industrial yarn according to claim 3, characterized in that: The length L4 of the jet rotating device along the left and right direction is 14-18mm, the width L2 of the annular boss along the left and right direction is 6-8mm, the wall thickness L7 of the annular boss is 1-2mm, the major axis length L3 of the ellipsoidal sphere is 8-10mm, the minor axis length L5 of the ellipsoidal sphere is 5-7mm, the left and right bosses are both cylindrical structures, the central axes are parallel to the left and right directions and the size is the same, the diameter L6 of the right boss is 2-3mm, the width of the filament bundle channel along the left and right direction is 5-7mm, and the length of the filament bundle channel along the front and back direction is 35-45mm.

5. The network device used for the network point of thick denier polyester industrial yarn according to claim 1, characterized in that: The air flow channel passes through the center of the ellipsoid.

6. The network device used for the network point of thick denier polyester industrial yarn according to claim 1, characterized in that: The jet rotating device is a smooth ceramic part with a surface roughness Ra value of 1.2-2.0μm; The junction of the internal tow channel and the compressed air channel of the networker used in the coarse denier polyester industrial yarn network point is provided with a left groove and a right groove; 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, and the size is larger than the whole formed by the left convex handle and the left end of the elliptical ball. The whole formed by the left convex handle and the left end of the elliptical ball 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 the whole formed by the right convex handle and the right end of the elliptical ball, and the size is larger than the whole formed by the right convex handle and the right end of the elliptical ball. The whole formed by the right convex handle and the right end of the elliptical ball 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.

7. The network device used for the network point of thick denier polyester industrial yarn according to claim 1, characterized in that: The extension direction of the compressed air channel is parallel to the up-down direction.

8. The network device used for the network point of thick denier polyester industrial yarn according to claim 1, characterized in that: The network device used in the coarse denier polyester industrial yarn network point is divided into an upper cover layer, a middle layer, and a main layer arranged from top to bottom. The tow channel is arranged in the middle layer, and the compressed air channel is arranged in the main layer. The tow channel is surrounded by a left wall, a right wall, an upper wall, and a lower wall. The left wall is composed of an upper and lower part. The lower part of the left wall is detachably connected to the lower wall. A gap is left between the lower part of the left wall and the upper part of the left wall, and the gap is the tow entrance.

9. The network device used for the network point of 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 planes, and the upper surface of the lower wall is a curved surface, which is arched upward along the front-to-back direction and arched downward along the left-to-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 9-12mm, and the minimum distance between the lower surface of the upper wall and the upper surface of the lower wall is 6-9mm.

10. A method for making a network dot on a coarse denier polyester industrial yarn, characterized in that: Using a network device for making a network point of thick denier polyester industrial yarn as described in any one of claims 1 to 9, passing the thick denier polyester industrial yarn through a tow channel, and continuously introducing compressed air into the compressed air channel; The specifications of coarse denier polyester industrial yarn are 4400-8800dtex / 488-976f, the winding speed is 2600-2850m / min, the winding tension is 600-1200cN, the network pressure is 4.0-4.5bar, and after the tow leaves the tow channel, the network degree is 11-18 pieces / meter, the number of loops is 0.0001-0.0004 pieces / meter, and the network fastness is 83-93%.

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