Method for making network points on porous fine denier polyester filament yarn and used network device

Abstract

The invention belongs to the technical field of spinning, and relates to a porous fine denier polyester filament yarn interlacing point dotting method and a used interlacing device, the interlacing device is internally provided with a tow channel, a compressed air channel and an air injection rotating device, and the air injection rotating device is arranged at the junction of the tow channel and the compressed air channel and internally provided with an air flow channel. The airflow channel is the only channel between the tow channel and the compressed air channel; the air injection rotating device comprises a left convex handle, an elliptical ball and a right convex handle, and the airflow channel is located in the elliptical ball; an airflow outlet a and an airflow outlet b are formed in the upper end of the airflow channel, and an airflow outlet c is formed in the lower end of the airflow channel; the porous fine-denier polyester filament yarn penetrates through the tow channel, and compressed air is continuously introduced into the air compression channel, so that the porous fine-denier polyester filament yarn can be dotted. By regulating and controlling the air flow impact mode, high network points and low loop number of the porous fine denier polyester filament yarn are realized under low pressure, and the network fastness and the overall quality of the product are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a method for making network dots of porous fine-denier polyester filaments and a network device used therein. Background Art

[0002] Porous fine-denier polyester filament is a unique fiber material, characterized by small single-filament fineness and large number of strands. Common product specifications include 50dtex / 144f, 167dtex / 288f and 330dtex / 576f. The softness, smoothness and soft gloss of this fiber are all due to its fine fiber structure. Fabrics woven from porous fine-denier yarns are light, elegant, soft and comfortable, and are very suitable for making high-simulation silk style products.

[0003] However, there are also some technical challenges in producing porous fine-denier yarns: due to the large number of holes, the cohesion between the single filaments is relatively weak, which makes the tow easy to loosen or produce terry yarns during the unwinding and weaving process. In order to solve this problem, it is necessary to increase the network points to improve the aggregation and stability of the tow, so that the tow can be better aggregated and not loose, and can even be woven without sizing. The conventional method is to achieve this by selecting a suitable network device and providing a large network pressure, but the characteristics of porous fine-denier yarns are thin single filaments and a large number of roots, which makes it easy to produce terry yarns under high pressure. Therefore, it is difficult for porous fine-denier polyester filaments to reduce the number of terry yarns while adding high network points.

[0004] Regarding the formation of network points, the network devices in the prior art are mainly divided into two types: continuous jet airflow and intermittent jet airflow. The network device with continuous jet airflow has a simple structure and is easy to operate, and is the mainstream choice on the market. However, this type of network device will cause the tow to vibrate continuously at high frequency during operation, strongly hitting the wall of the network device, which can easily cause the fine denier monofilament to be blown off or stretched unevenly, thereby producing loops. Therefore, it is difficult for the network device with continuous jet airflow to take into account the two requirements of low loop number and high network fastness of porous fine denier polyester filament. The network device with intermittent jet airflow adds an intermittent airflow control device at the front end of the network device, which can accurately mark points, reduce the generation of loops, and save compressed air costs. However, the existing intermittent jet airflow network devices on the market have the problem that the airflow cutoff point is far away from the tow end. When the high-frequency airflow is jetted, the airflow is cut off before it reaches the tow end, resulting in a decrease in impact pressure, making it difficult to form a firm network point.

[0005] In order to solve these problems, some patents and technologies have also been tried. For example, CN221344831U proposed a buffered surround honeycomb hexagonal pre-network, which aims to improve the hair phenomenon by changing the shape of the wire path of the network device. However, this technology does not achieve high network points and network fastness based on the characteristics of porous fine denier yarns.

[0006] In addition, WO2023124513A1 provides a network composite yarn and its network method and application. The network device realizes the network effect through two nozzles on a specially designed nozzle. The two nozzles are arranged at intervals and are aligned with the central axis of the silk path. Since the pressure of the airflow injected from nozzle I is greater than that from nozzle II, the network strength of the network knot formed by nozzle I is greater than that of nozzle II. Although this method uses two nozzles and intermittent air jets to improve the network degree and network strength, the intermittent air jet method of the upper and lower holes is still difficult to form a highly aggregated morphology and firm network points based on the characteristics of the dispersed monofilaments of porous fine denier silk.

[0007] In summary, it is necessary to propose a network device and a network forming method for porous fine-denier polyester yarns that can solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to solve the problems existing in the prior art and to provide a method for making network dots of porous fine-denier polyester filaments and a network device used therefor.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A porous fine-denier polyester filament network device, which is provided 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;

[0011] The jet rotating device is installed at the junction of the tow channel and the compressed air channel;

[0012] 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;

[0013] 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;

[0014] The jet rotating device comprises a left convex handle, an elliptical ball, and a right convex handle which are sequentially arranged in the left-right direction, the long axis of the elliptical ball is parallel to the left-right direction, and the air flow channel is located in the elliptical ball; the air flow channel is Y-shaped, the upper end is an air flow outlet a and an air flow outlet b, and the lower end is an air flow outlet c, and the air flow outlet a and the air flow outlet b are arranged at intervals in the left-right direction;

[0015] The inner surface of the tow channel is composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by a line segment a, an arc line, and a line segment b being connected in sequence by smooth transition, the arc line is bent downward, and the ends of the line segments a and b that are not connected to the arc line are close to each other; the line segment a is the intersection line of the inclined surface a and the cross section, the arc line is the intersection line of the arc surface and the cross section, and the line segment b is the intersection line of the inclined surface b and the cross section;

[0016] The lower edge of the inclined surface a is located just above the junction of the left convex handle and the ellipsoid, and the lower edge of the inclined surface b is located just above the junction of the right convex handle and the ellipsoid.

[0017] As the preferred technical solution:

[0018] In the porous fine-denier polyester filament network device as described above, the airflow outlet a, the airflow outlet b and the airflow outlet c are circular or elliptical.

[0019] As described above, a porous fine-denier polyester filament network device, the length L5 of the jet rotating device along the left-right direction is 10-15mm, the major axis length L4 of the ellipsoid is 8-12mm, the minor axis length L7 of the ellipsoid is 6-8mm, the width L1 of the air flow outlet a along the left-right direction is 4-6mm, the width L2 of the air flow outlet b along the left-right direction is 2-3mm, the width L3 of the air flow outlet c along the left-right direction is 2-3mm, the left and right convex handles are both cylindrical structures, the central axes are parallel to the left-right direction and the size is the same, and the diameter L6 of the right convex handle is 1-2mm.

[0020] In the porous fine-denier polyester filament network device as described above, the center of the orthographic projection of the airflow outlet c coincides with the center of the orthographic projection of the ellipsoid.

[0021] In the porous fine-denier polyester filament network device as described above, the jet rotating device is a ceramic part with a smooth surface and a surface roughness Ra value of 1.2-2.0 μm.

[0022] A porous fine-denier polyester filament network device as described above, wherein a left groove and a right groove are provided at the junction of a filament channel and a compressed air channel inside the porous fine-denier polyester filament network device;

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

[0024] The shape of the right groove is the same as that of the right convex handle, and the right convex handle is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm;

[0025] The surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8-1.0 μm.

[0026] In the porous fine-denier polyester filament network device as described above, the extension direction of the compressed air channel is parallel to the up-down direction.

[0027] As described above, a porous fine-denier polyester filament network device has a lower curved surface that arches upward in the front-to-back direction and arches downward in the left-to-right direction. Such a design is conducive to the effective contact of the filament bundle with the jet rotating device, thereby driving the jet rotating device to rotate; the maximum height of the filament bundle channel in the up-down direction is 6-8mm, and the minimum height is 5-7mm; the length of the filament bundle channel in the front-to-back direction is 35-45mm; the porous fine-denier polyester filament network device 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 intermediate layer is a detachable structure.

[0028] A method for making a network dot on porous fine-denier polyester filaments, using a network device for porous fine-denier polyester filaments as described in any of the above items, passing the porous fine-denier polyester filaments through a tow channel, and continuously introducing compressed air into a compressed air channel.

[0029] As the preferred technical solution:

[0030] As described above, a method for making network dots on porous fine denier polyester filaments, the specification of the porous fine denier polyester filaments is 55dtex / 144f-300dtex / 576f, the winding speed is 3200-5500m / min, the winding tension is 10-40cN, the network pressure is 1.5-3.0bar, after the tow leaves the tow channel, the network degree is 10-30 / m, the number of coils is 0-3 / 10,000 meters, and the network fastness is 80-93%.

[0031] Principle of the invention:

[0032] Due to the small size of single filaments, porous fine-denier polyester filaments are prone to high-frequency vibrations when facing the impact of turbulent airflow during the network processing, which in turn causes stretching, curling, and even broken filaments. Therefore, compared with conventional polyester filaments, the network pressure needs to be appropriately reduced to avoid the above problems. However, porous fine-denier polyester filaments have a large number of fibers. When the network pressure is low, it is difficult to achieve uniform high-frequency vibrations and position exchange during the network process, and thus it is impossible to form a stable entangled structure.

[0033] In order to achieve a high network point effect under low network pressure, the present invention designs a jet rotating device, the core of which is to utilize the alternating impact mode of single and double airflows. When the jet rotating device rotates to the point where the airflow outlet c is on top, it sprays a single airflow toward the filament bundle. When the jet rotating device rotates to the point where the airflow outlet a and the airflow outlet b are on top, it sprays double airflows toward the filament bundle.

[0034] The tow is divided into a left tow, a middle tow, and a right tow arranged from left to right in sequence along the left and right directions. A single airflow acts on the entire tow, and the entire tow vibrates at high frequency and exchanges positions under the action of the airflow to form an entangled structure. However, due to the small single fiber fineness and large number of holes of the porous fine denier polyester filament, the network pressure used is small, and the left tow and the right tow are difficult to effectively form a firm entangled structure with the middle tow. Therefore, it is necessary to effectively exchange and entangle the middle tow and the left tow (right tow); when switching to a double airflow, the two airflows act on the left tow and the right tow, prompting the left tow (right tow) to vibrate at high frequency to form an entangled structure; this alternating action not only promotes the full interweaving of the fibers inside the tow, but also ensures that the entire tow achieves a high network degree and good cohesion under a lower network pressure. In addition, the present invention controls the outlet area of ​​the airflow outlet a and the airflow outlet b to be small, so that the airflow velocity can be increased, prompting the tows to effectively exchange positions, thereby forming a stable network point in the entire tow.

[0035] If a single airflow impact mode is used, in order to achieve high network, it is usually achieved by increasing the network pressure. However, when the network pressure is increased, for porous fine-denier polyester filaments, the tow is very likely to form loops or single filaments under the action of high-pressure turbulence. Therefore, the present invention uses a lower network pressure to make network points. The disadvantage of low pressure is that the vibration frequency of the tow under the action of pressure is also low, and it is difficult for the outer tow and the inner tow to exchange positions to form an effective entangled structure, so the number of network points is small and the network fastness is low.

[0036] If the double airflow impact mode is used, although the middle filament bundle and the left filament bundle (right filament bundle) can be effectively exchanged to form an entangled structure, the area of ​​the double airflow impacting the filament bundle is small, and only the two side parts of the filament bundle can exchange positions and form entanglement under the action of air pressure. The middle filament bundle cannot be effectively driven, and thus the entanglement of the entire filament bundle cannot be formed.

[0037] In summary, this method effectively solves the problem of porous fine-denier polyester filaments in network processing by finely controlling the airflow impact mode, achieves a high network point effect under low pressure, and improves the network fastness and overall quality of the product.

[0038] Beneficial effects:

[0039] The jet rotating device included in the network device of the present invention changes the airflow pattern of the impacting filament bundles by alternately using single and double airflows to impact the filament bundles, thereby breaking the single high-frequency vibration state. This change causes the filament bundles to form different shaking and entanglement patterns, achieving high network points and low number of filament loops of porous fine-denier polyester filaments under low pressure, thereby improving the network fastness and overall quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the overall appearance of the network device of the present invention, wherein the X-axis direction is the left-right direction, the Y-axis direction is the front-back direction, and the Z-axis direction is the up-down direction;

[0041] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0042] Figure 3 It is a structural schematic diagram of the jet rotating device of the network device of the present invention;

[0043] Figure 4 It is a schematic cross-sectional structure diagram of an air flow channel in the jet rotating device of the network device of the present invention;

[0044] Figure 5 It is a side structural schematic diagram of the jet rotating device of the network device of the present invention;

[0045] Figure 6 It is a schematic diagram of the double-hole jet airflow direction of the airflow channel of the network device of the present invention;

[0046] Figure 7 Schematic diagram of the flow direction of the single-hole jet airflow in the airflow channel of the network device of the present invention;

[0047] Figure 8 This is a schematic diagram of the structure of the jet rotating device of the network device of Comparative Example 1;

[0048] Among them, 11-main layer, 12-compressed air channel, 21-non-detachable plate, 22-tow channel, 23-tow inlet, 31-upper cover layer, 41-detachable plate, 51-ellipsoidal ball, 52-right convex handle, 531-air flow outlet c, 532-air flow outlet a, 533-air flow outlet b, 56-air flow. DETAILED DESCRIPTION

[0049] 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.

[0050] Test methods for relevant performance indicators:

[0051] Network degree: The network degree is tested by needle puncture method according to ZF / T5001 standard. Take a 1-meter-long tow, fix one end of the tow, and start from the fixed end. Use a needle to puncture the center of the tow and slide down. If there is entanglement 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, the number of tangles is counted. Each tow is tested twice, and the average number of tangled points in the two tests is taken, which is the network degree, unit: pieces / 10,000 meters;

[0052] Number of looped yarns: The yarn 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 images to identify and extract the hairiness on the yarn bundle. Based on the processed images, the operator counts the number of looped yarns by checking and analyzing the yarn bundle morphology. The length of a single tested yarn bundle is 10,000 meters, the yarn bundle running speed is 400 m / min, and the distance sensitivity is set to count when it is greater than 1,500 µm.

[0053] Network fastness: After a certain load is applied to the network yarn, the percentage of the network fastness after the heavy load compared with the network fastness before the heavy load is the network fastness (St). Test method: Take a 3m wire to be tested and measure its original network fastness N. Then hang the wire vertically and apply a constant load (the load standard is 1.32cN / dtex) at the bottom of the wire through a weight. After 3 minutes, remove the added load and measure the residual network fastness Nr. The network fastness is calculated by the formula St=(Nr / N)x100%;

[0054] The number of times and the intensity of the intermittent injection of compressed air: The number of times and the intensity of the intermittent injection of compressed air 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 metal strain gauge of the sensitive element inside it is deformed. This deformation in turn causes the change of the inductance parameter, and converts these pressure changes into a measurable electrical signal output, forming a periodic fluctuation image with time as the horizontal coordinate and intensity as the vertical coordinate on the central control display. The peak of the fluctuation image is the injection intensity of the compressed air, and the number of peaks in one minute is the number of times the compressed air is injected intermittently; 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 injection intensity of the network device. By checking the displayed data of the pressure gauge, it can be judged whether the injection intensity is stable;

[0055] 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.

[0056] Example 1

[0057] A porous fine denier polyester filament network device, such as Figure 1~2 As shown, it is divided into an upper cover layer 31, an intermediate layer, and a main body layer 11 arranged in sequence from top to bottom;

[0058] like Figure 1 As shown, the middle layer is composed of a non-detachable plate 21 and a detachable plate 41, and a tow channel 22 extending in a direction parallel to the front-rear direction is provided therein, and a gap is left between the non-detachable plate 21 and the detachable plate 41, and the gap is a tow inlet 23, and the tow inlet 23 is connected to the tow channel 22;

[0059] like Figure 2 As shown, the inner surface of the tow channel 22 is composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by a line segment a, an arc line, and a line segment b being smoothly connected in sequence, the bending direction of the arc line is downward, and the ends of the line segment a and the line segment b that are not connected to the arc line are close to each other; the line segment a is the intersection line of the inclined surface a and the cross section, the arc line is the intersection line of the arc surface and the cross section, and the line segment b is the intersection line of the inclined surface b and the cross section; the lower curved surface is arched upward along the front-back direction and arched downward along the left-right direction;

[0060] The length of the tow channel 22 in the front-to-back direction is 35 mm, the maximum height in the up-down direction is 6 mm, and the minimum height in the up-down direction is 5 mm;

[0061] like Figure 2 As shown, a compressed air channel 12 extending in a direction parallel to the up-down direction is provided inside the main body layer 11;

[0062] A left groove, a right groove and an air jet rotating device are provided at the junction of the tow channel 22 and the compressed air channel 12; the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8 μm; the air jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2 μm;

[0063] like Figures 3-5As shown, the jet rotating device includes a left convex handle, an elliptical ball 51, and a right convex handle 52 arranged in sequence along the left-right direction, and the long axis of the elliptical ball 51 is parallel to the left-right direction; the left convex handle and the right convex handle 52 are both cylindrical structures, the central axis is parallel to the left-right direction and the size is the same; an air flow channel is arranged in the elliptical ball 51, and the air flow channel is the only channel between the tow channel 22 and the compressed air channel 12; the air flow channel is Y-shaped, the upper end is the air flow outlet a 532 and the air flow outlet b 533, and the lower end is the air flow outlet c 531, the air flow outlet a 532, the air flow outlet b 533 and the air flow outlet c 531 are circular or elliptical; the air flow outlet a 532 and the air flow outlet b 533 are arranged at intervals along the left-right direction; the center of the orthographic projection of the air flow outlet c 531 coincides with the center of the orthographic projection of the elliptical ball 51;

[0064] The length L5 of the jet rotating device along the left-right direction is 10 mm, the length L4 of the major axis of the ellipsoid 51 is 8 mm, the length L7 of the minor axis of the ellipsoid 51 is 6 mm, the width L3 of the airflow outlet c 531 along the left-right direction is 4 mm, the width L2 of the airflow outlet a 532 along the left-right direction is 2 mm, the width L1 of the airflow outlet b 533 along the left-right direction is 2 mm, and the diameter L6 of the right lug 52 is 1 mm;

[0065] The shape of the left groove is the same as the whole formed by the left convex handle and the left end of the elliptical ball 51. The whole formed by the left convex handle and the left end of the elliptical ball 51 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05mm.

[0066] The shape of the right groove is the same as the whole formed by the right convex handle 52 and the right end of the elliptical ball 51. The whole formed by the right convex handle 52 and the right end of the elliptical ball 51 is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05mm;

[0067] The lower edge of the inclined surface a is located just above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined surface b is located just above the junction of the right convex handle 52 and the ellipsoid 51;

[0068] The installation method of the jet rotating device satisfies that: when the tow passes through the tow channel 22, it contacts the jet rotating device and drives the jet rotating device to rotate around a central axis parallel to the left-right direction;

[0069] like Figure 6-7 Shown is the flow direction of the airflow 56 in the jet rotating device and the tow channel 22.

[0070] Example 2

[0071] A porous fine denier polyester filament network device, such as Figure 1~2 As shown, it is divided into an upper cover layer 31, an intermediate layer, and a main body layer 11 arranged in sequence from top to bottom;

[0072] like Figure 1 As shown, the middle layer is composed of a non-detachable plate 21 and a detachable plate 41, and a tow channel 22 extending in a direction parallel to the front-rear direction is provided therein, and a gap is left between the non-detachable plate 21 and the detachable plate 41, and the gap is a tow inlet 23, and the tow inlet 23 is connected to the tow channel 22;

[0073] like Figure 2 As shown, the inner surface of the tow channel 22 is composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by a line segment a, an arc line, and a line segment b being smoothly connected in sequence, the bending direction of the arc line is downward, and the ends of the line segment a and the line segment b that are not connected to the arc line are close to each other; the line segment a is the intersection line of the inclined surface a and the cross section, the arc line is the intersection line of the arc surface and the cross section, and the line segment b is the intersection line of the inclined surface b and the cross section; the lower curved surface is arched upward along the front-back direction and arched downward along the left-right direction;

[0074] The length of the tow channel 22 in the front-to-back direction is 40 mm, the maximum height in the up-down direction is 7 mm, and the minimum height in the up-down direction is 6 mm;

[0075] like Figure 2 As shown, a compressed air channel 12 extending in a direction parallel to the up-down direction is provided inside the main body layer 11;

[0076] A left groove, a right groove and an air jet rotating device are provided at the junction of the tow channel 22 and the compressed air channel 12; the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.9 μm; the air jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.5 μm;

[0077] like Figures 3-5 As shown, the jet rotating device includes a left convex handle, an elliptical ball 51, and a right convex handle 52 arranged in sequence along the left-right direction, and the long axis of the elliptical ball 51 is parallel to the left-right direction; the left convex handle and the right convex handle 52 are both cylindrical structures, the central axis is parallel to the left-right direction and the size is the same; an air flow channel is arranged in the elliptical ball 51, and the air flow channel is the only channel between the tow channel 22 and the compressed air channel 12; the air flow channel is Y-shaped, the upper end is the air flow outlet a 532 and the air flow outlet b 533, and the lower end is the air flow outlet c 531, the air flow outlet a 532, the air flow outlet b 533 and the air flow outlet c 531 are circular or elliptical; the air flow outlet a 532 and the air flow outlet b 533 are arranged at intervals along the left-right direction; the center of the orthographic projection of the air flow outlet c 531 coincides with the center of the orthographic projection of the elliptical ball 51;

[0078] The length L5 of the jet rotating device along the left-right direction is 12 mm, the length L4 of the major axis of the ellipsoid 51 is 10 mm, the length L7 of the minor axis of the ellipsoid 51 is 7 mm, the width L3 of the airflow outlet c 531 along the left-right direction is 5 mm, the width L2 of the airflow outlet a 532 along the left-right direction is 2 mm, the width L1 of the airflow outlet b 533 along the left-right direction is 2 mm, and the diameter L6 of the right lug 52 is 1 mm;

[0079] The shape of the left groove is the same as the whole formed by the left convex handle and the left end of the elliptical ball 51. The whole formed by the left convex handle and the left end of the elliptical ball 51 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05mm.

[0080] The shape of the right groove is the same as the whole formed by the right convex handle 52 and the right end of the elliptical ball 51. The whole formed by the right convex handle 52 and the right end of the elliptical ball 51 is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05mm;

[0081] The lower edge of the inclined surface a is located just above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined surface b is located just above the junction of the right convex handle 52 and the ellipsoid 51;

[0082] The installation method of the jet rotating device satisfies that: when the tow passes through the tow channel 22, it contacts the jet rotating device and drives the jet rotating device to rotate around a central axis parallel to the left-right direction;

[0083] like Figure 6-7 Shown is the flow direction of the airflow 56 in the jet rotating device and the tow channel 22.

[0084] Example 3

[0085] A porous fine denier polyester filament network device, such as Figure 1~2 As shown, it is divided into an upper cover layer 31, an intermediate layer, and a main body layer 11 arranged in sequence from top to bottom;

[0086] like Figure 1 As shown, the middle layer is composed of a non-detachable plate 21 and a detachable plate 41, and a tow channel 22 extending in a direction parallel to the front-rear direction is provided therein, and a gap is left between the non-detachable plate 21 and the detachable plate 41, and the gap is a tow inlet 23, and the tow inlet 23 is connected to the tow channel 22;

[0087] like Figure 2As shown, the inner surface of the tow channel 22 is composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by a line segment a, an arc line, and a line segment b being smoothly connected in sequence, the bending direction of the arc line is downward, and the ends of the line segment a and the line segment b that are not connected to the arc line are close to each other; the line segment a is the intersection line of the inclined surface a and the cross section, the arc line is the intersection line of the arc surface and the cross section, and the line segment b is the intersection line of the inclined surface b and the cross section; the lower curved surface is arched upward along the front-back direction and arched downward along the left-right direction;

[0088] The length of the tow channel 22 in the front-to-back direction is 45 mm, the maximum height in the up-down direction is 8 mm, and the minimum height in the up-down direction is 7 mm;

[0089] like Figure 2 As shown, a compressed air channel 12 extending in a direction parallel to the up-down direction is provided inside the main body layer 11;

[0090] A left groove, a right groove and an air jet rotating device are provided at the junction of the tow channel 22 and the compressed air channel 12; the surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 1 μm; the air jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 2 μm;

[0091] like Figures 3-5 As shown, the jet rotating device includes a left convex handle, an elliptical ball 51, and a right convex handle 52 arranged in sequence along the left-right direction, and the long axis of the elliptical ball 51 is parallel to the left-right direction; the left convex handle and the right convex handle 52 are both cylindrical structures, the central axis is parallel to the left-right direction and the size is the same; an air flow channel is arranged in the elliptical ball 51, and the air flow channel is the only channel between the tow channel 22 and the compressed air channel 12; the air flow channel is Y-shaped, the upper end is the air flow outlet a 532 and the air flow outlet b 533, and the lower end is the air flow outlet c 531, the air flow outlet a 532, the air flow outlet b 533 and the air flow outlet c 531 are circular or elliptical; the air flow outlet a 532 and the air flow outlet b 533 are arranged at intervals along the left-right direction; the center of the orthographic projection of the air flow outlet c 531 coincides with the center of the orthographic projection of the elliptical ball 51;

[0092] The length L5 of the jet rotating device along the left-right direction is 15 mm, the length L4 of the major axis of the ellipsoid 51 is 12 mm, the length L7 of the minor axis of the ellipsoid 51 is 8 mm, the width L3 of the airflow outlet c 531 along the left-right direction is 6 mm, the width L2 of the airflow outlet a 532 along the left-right direction is 3 mm, the width L1 of the airflow outlet b 533 along the left-right direction is 3 mm, and the diameter L6 of the right lug 52 is 2 mm;

[0093] The shape of the left groove is the same as the whole formed by the left convex handle and the left end of the elliptical ball 51. The whole formed by the left convex handle and the left end of the elliptical ball 51 is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.1mm.

[0094] The shape of the right groove is the same as the whole formed by the right convex handle 52 and the right end of the elliptical ball 51. The whole formed by the right convex handle 52 and the right end of the elliptical ball 51 is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.1mm;

[0095] The lower edge of the inclined surface a is located just above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined surface b is located just above the junction of the right convex handle 52 and the ellipsoid 51;

[0096] The installation method of the jet rotating device satisfies that: when the tow passes through the tow channel 22, it contacts the jet rotating device and drives the jet rotating device to rotate around a central axis parallel to the left-right direction;

[0097] like Figure 6-7 Shown is the flow direction of the airflow 56 in the jet rotating device and the tow channel 22.

[0098] Example 4

[0099] A method for making a network dot on porous fine-denier polyester filaments, using a network device for porous fine-denier polyester filaments in Example 1, passing the porous fine-denier polyester filaments through a tow channel 22, and continuously introducing compressed air into a compressed air channel 12; wherein the winding speed is 5500m / min, the winding tension is 10cN, and the network pressure is 2bar.

[0100] The specification of the porous fine-denier polyester filament obtained is 55dtex / 144f. After the tow leaves the tow channel 22, the network density is 30 per meter, the number of loops is 1 per 10,000 meters, and the network fastness is 93%.

[0101] Example 5

[0102] A method for making a network dot on porous fine-denier polyester filaments, using a network device for porous fine-denier polyester filaments in Example 2, passing the porous fine-denier polyester filaments through a tow channel 22, and continuously introducing compressed air into a compressed air channel 12; wherein the winding speed is 4000 m / min, the winding tension is 22 cN, and the network pressure is 2.7 bar.

[0103] The specification of the porous fine-denier polyester filament obtained is 150dtex / 384f. After the tow leaves the tow channel 22, the network density is 20 per meter, the number of loops is 1 per 10,000 meters, and the network fastness is 90%.

[0104] Comparative Example 1

[0105] A method for making a network of porous fine denier polyester filaments is basically the same as that of Example 5, except that: Figure 8 As shown, the air flow channel of the jet rotating device of the network device of this comparative example has only one air flow outlet at the upper end, and its shape and size are the same as the air flow outlet c at the lower end.

[0106] The porous fine-denier polyester filaments are passed through the tow channel, and compressed air is continuously introduced into the compressed air channel; wherein, the winding speed is 4000m / min, the winding tension is 22cN, and the network pressure is 2.7bar.

[0107] The specification of the porous fine-denier polyester filament obtained is 150dtex / 384f. After the tow leaves the tow channel, the network density is 13 per meter, the number of loops is 3 per 10,000 meters, and the network fastness is 69%.

[0108] Compared with Example 5, the network degree of the porous fine denier polyester filaments prepared in Comparative Example 1 is reduced by 35%, the number of loops is 3 times that of Example 5, and the network fastness is reduced by 21%. This is because the number of porous fine denier filaments is large, and the airflow channel of the jet rotating device in Comparative Example 1 is a single-hole structure. The single-hole jet airflow is difficult to gather the scattered filaments on both sides of the filament bundle and form a strong network structure with the whole bundle of filaments. In contrast, Example 5 can well gather the porous fine denier filaments in the network device and exchange the positions of the filaments through alternating single and double-hole airflow jets to form a stable network structure. Therefore, the network effect of Comparative Example 1 is worse than that of Example 5.

[0109] Example 6

[0110] A method for making a network dot on porous fine-denier polyester filaments, using a network device for porous fine-denier polyester filaments in Example 3, passing the porous fine-denier polyester filaments through a tow channel 22, and continuously introducing compressed air into a compressed air channel 12; wherein the winding speed is 3200 m / min, the winding tension is 40 cN, and the network pressure is 3 bar.

[0111] The specification of the porous fine-denier polyester filament obtained is 275dtex / 576f. After the tow leaves the tow channel 22, the network density is 15 per meter, the number of loops is 3 per 10,000 meters, and the network fastness is 86%.

Claims

1. A porous fine-denier polyester filament network device, which has 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; 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; The jet rotating device comprises a left convex handle, an elliptical ball, and a right convex handle which are sequentially arranged in the left-right direction, the long axis of the elliptical ball is parallel to the left-right direction, and the air flow channel is located in the elliptical ball; the air flow channel is Y-shaped, the upper end is an air flow outlet a and an air flow outlet b, and the lower end is an air flow outlet c, and the air flow outlet a and the air flow outlet b are arranged at intervals in the left-right direction; The inner surface of the tow channel is composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by a line segment a, an arc line, and a line segment b being connected in sequence by smooth transition, the arc line is bent downward, and the ends of the line segments a and b that are not connected to the arc line are close to each other; the line segment a is the intersection line of the inclined surface a and the cross section, the arc line is the intersection line of the arc surface and the cross section, and the line segment b is the intersection line of the inclined surface b and the cross section; The lower edge of the inclined surface a is located just above the junction of the left convex handle and the ellipsoid, and the lower edge of the inclined surface b is located just above the junction of the right convex handle and the ellipsoid.

2. A porous fine denier polyester filament network device according to claim 1, characterized in that: The airflow outlet a, the airflow outlet b and the airflow outlet c are circular or elliptical.

3. The porous fine denier polyester filament network device according to claim 2, characterized in that: The length L5 of the jet rotating device along the left-right direction is 10-15mm, the length L4 of the major axis of the ellipsoid is 8-12mm, the length L7 of the minor axis of the ellipsoid is 6-8mm, the width L1 of the airflow outlet a along the left-right direction is 4-6mm, the width L2 of the airflow outlet b along the left-right direction is 2-3mm, the width L3 of the airflow outlet c along the left-right direction is 2-3mm, the left and right cams are both cylindrical structures, the central axes are parallel to the left-right directions and the same size, and the diameter L6 of the right cam is 1-2mm.

4. The porous fine denier polyester filament network device according to claim 3, characterized in that: The center of the orthographic projection of the airflow outlet c coincides with the center of the orthographic projection of the ellipsoid.

5. The porous fine-denier polyester filament network device according to claim 3, characterized in that: The jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2-2.0μm.

6. The porous fine-denier polyester filament network device according to claim 3, characterized in that: A left groove and a right groove are provided at the junction of the tow channel and the compressed air channel inside the porous fine-denier polyester filament network device; The shape of the left groove is the same as that of the left convex handle, and the left convex handle is embedded in the left groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm; The shape of the right groove is the same as that of the right convex handle, and the right convex handle is embedded in the right groove, and the height of the gap between the two in the vertical direction is 0.05-0.1mm; The surfaces of the left groove and the right groove are smoothed, and the surface roughness Ra value is 0.8-1.0 μm.

7. The porous fine-denier polyester filament network device according to claim 1, characterized in that: The extension direction of the compressed air channel is parallel to the up-down direction.

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

9. A method for making a network of porous fine-denier polyester filaments, characterized in that: A porous fine-denier polyester filament network device as described in any one of claims 1 to 8 is used to pass the porous fine-denier polyester filament through the tow channel, and compressed air is continuously introduced into the compressed air channel.

10. A method for forming dots on porous fine-denier polyester filaments according to claim 9, characterized in that: The specifications of porous fine denier polyester filament are 55dtex / 144f-300dtex / 576f, the winding speed is 3200-5500m / min, the winding tension is 10-40cN, the network pressure is 1.5-3.0bar, after the tow leaves the tow channel, the network degree is 10-30 pieces / meter, the number of loops is 0-3 pieces / 10,000 meters, and the network fastness is 80-93%.

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