Method for adding texturing points to porous fine denier polyester filament and texturing device used therefor

Abstract

The present invention belongs to the technical field of spinning, and relates to a method for dotting a network of porous fine denier polyester filaments and a network device used therefor. Inside the network device, there are a filament bundle channel, a compressed air channel, and a jet rotating device with an air flow channel arranged at the junction of the two. The air flow channel is the only channel between the filament bundle channel and the compressed air channel; the jet rotating device includes a left convex handle, an ellipsoid, and a right convex handle, and the air flow channel is located inside the ellipsoid; the air flow channel is in a Y shape, with an air flow outlet a and an air flow outlet b at the upper end and an air flow outlet c at the lower end; passing the porous fine denier polyester filaments through the filament bundle channel and continuously introducing compressed air into the compressed air channel can dot the network of the porous fine denier polyester filaments. By regulating the air flow impact mode, the present invention realizes high network points and low number of filament loops of the porous fine denier polyester filaments under low pressure, improving the network fastness and overall quality of the product.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinning, and particularly relates to a method for adding network points to porous fine-denier polyester filaments and a network device used therefor. Background Art

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

[0003] However, there are also some technical challenges in the production of porous fine-denier filaments: due to the large number of holes, the cohesion between single filaments is relatively weak, resulting in the tendency of the filament bundle to loosen or form looped filaments during unwinding and weaving. To solve this problem, it is necessary to increase the network points to improve the aggregation and stability of the filament bundle, so that the filament bundle can be better aggregated and not loose, and even can be woven without sizing. The conventional method is to achieve this by selecting a suitable network device and providing a large network pressure. However, the characteristics of small single-filament fineness and a large number of filaments in porous fine-denier filaments make it easy to produce looped filaments under high pressure. Therefore, it is difficult for porous fine-denier polyester filaments to reduce the number of looped filaments while adding high network points.

[0004] Regarding the formation of network points, the network devices of 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 in the market. However, when this network device works, it will cause the filament bundle to vibrate continuously at a high frequency, strongly impact the wall surface of the network device, and easily cause the fine-denier single filaments to be blown off or unevenly stretched, resulting in the generation of looped filaments. Therefore, it is difficult for the network device with continuous jet airflow to meet the two requirements of low looped filament quantity and high network fastness for porous fine-denier polyester filaments. The network device with intermittent jet airflow adds an intermittent airflow control device at the front end of the network device, which can accurately dot, reduce the generation of looped filaments, and save the cost of compressed air. However, the existing intermittent jet airflow network devices in the market have the problem that the airflow cut-off point is far from the filament bundle end. When the high-frequency jet airflow is used, the airflow is truncated before reaching the filament bundle end, resulting in a decrease in the impact pressure and making it difficult to form firm network points.

[0005] To solve these problems, some patents and technologies have also been tried. For example, CN221344831U proposed a buffer-wrapped honeycomb hexagonal pre-network, aiming to improve the hairiness phenomenon by changing the shape of the filament path of the network device. However, this technology does not achieve high network points and network fastness for the characteristics of porous fine-denier filaments.

[0006] In addition, WO2023124513A1 provides a network composite filament, its networking method and application. The networker realizes the networking effect through two nozzles on a specially designed nozzle. The two nozzles are arranged at intervals and are both aligned with the central axis of the filament path. Since the pressure of the air flow injected by nozzle I is greater than that of nozzle II, the networking fastness of the network knots formed by nozzle I is greater than that of nozzle II. Although this method uses two nozzles and the method of intermittent air injection to improve the networking degree and networking fastness, the method of intermittent air injection through the upper and lower holes is still difficult to form a highly aggregated morphology and firm network points according to the characteristics of the dispersion of single filaments of porous fine denier filaments.

[0007] In summary, it is necessary to propose a networker and a networking method for porous fine denier polyester filaments 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 provide a method for forming network points on porous fine denier polyester filaments and the networker used.

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

[0010] A networker for porous fine denier polyester filaments is internally provided with a filament bundle channel and a compressed air channel. The extending direction of the filament bundle channel is parallel to the front-back direction. The compressed air channel is located below the filament bundle channel, and an air jet rotating device is also provided inside;

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

[0012] An air flow channel is provided inside the air jet rotating device, and the air flow channel is the only channel between the filament bundle channel and the compressed air channel;

[0013] The installation method of the air jet rotating device satisfies that when the filament bundle passes through the filament bundle channel, it contacts the air jet rotating device and drives the air jet rotating device to rotate around the central axis parallel to the left-right direction;

[0014] The air jet rotating device includes a left convex handle, an elliptical ball, and a right convex handle arranged in sequence along 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 inside the elliptical ball; the air flow channel is in a Y shape, with an air flow outlet a and an air flow outlet b at the upper end and an air flow outlet c at the lower end. The air flow outlet a and the air flow outlet b are arranged at intervals along the left-right direction;

[0015] The inner surface of the tow channel is jointly composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of 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 sequentially and smoothly connected by a line segment a, an arc line, and a line segment b, 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;

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

[0017] As a preferred technical solution:

[0018] For a yarn entangler for porous fine denier polyester filaments as described above, the air flow outlets a, b, and c are circular or elliptical.

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

[0020] For a yarn entangler for porous fine denier polyester filaments as described above, the center of the orthographic projection of the air flow outlet c coincides with the center of the orthographic projection of the ellipsoid.

[0021] For a yarn entangler for porous fine denier polyester filaments as described above, the jet rotating device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.2 - 2.0 μm.

[0022] For a yarn entangler for porous fine denier polyester filaments as described above, left and right grooves are provided at the junction of the tow channel and the compressed air channel inside the yarn entangler for porous fine denier polyester filaments;

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

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

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

[0026] A yarn entangler for porous fine denier polyester filaments as described above, the extending direction of the compressed air passage is parallel to the up-down direction.

[0027] A yarn entangler for porous fine denier polyester filaments as described above, the lower curved surface arches upward in the front-back direction and arches downward in the left-right direction. Such a design is conducive to the effective contact between the filament bundle and the jet rotating device, driving the jet rotating device to rotate; the maximum height of the filament bundle passage in the up-down direction is 6 - 8 mm, and the minimum height is 5 - 7 mm; the length of the filament bundle passage in the front-back direction is 35 - 45 mm; the yarn entangler for porous fine denier polyester filaments 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 passage is arranged in the intermediate layer, and the compressed air passage is arranged in the main body layer; the intermediate layer is a detachable structure.

[0028] A method for dotting porous fine denier polyester filaments with network points, using a yarn entangler for porous fine denier polyester filaments as described in any one of the above, passing the porous fine denier polyester filaments through the filament bundle passage, and continuously introducing compressed air into the compressed air passage.

[0029] As a preferred technical solution:

[0030] A method for dotting porous fine denier polyester filaments with network points as described above, the specification of the porous fine denier polyester filaments is 55 dtex / 144 f - 300 dtex / 576 f, the winding speed is 3200 - 5500 m / min, the winding tension is 10 - 40 cN, the network pressure is 1.5 - 3.0 bar, after the filament bundle leaves the filament bundle passage, the network degree is 10 - 30 pieces / meter, the number of coiled filaments is 0 - 3 pieces / 10,000 meters, and the network fastness is 80 - 93%.

[0031] Principle of the invention:

[0032] Due to the small fineness of single filaments of porous fine denier polyester filaments, during the network processing, in the face of the impact of turbulent air flow, it is easy to generate high-frequency vibration, which may further cause stretching and curling or even filament breakage. Therefore, compared with conventional polyester filaments, it is necessary to appropriately reduce the network pressure to avoid the above problems. However, the number of fiber roots of porous fine denier polyester filaments is relatively large. When the network pressure is small, it is difficult to achieve uniform high-frequency vibration and position exchange during the network process, and thus a stable entanglement structure cannot be formed.

[0033] 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-strand and double-strand air flows. When the jet rotating device rotates to the position where the air flow outlet c is on the upper side, it sprays a single-strand air flow to the filament bundle. When the jet rotating device rotates to the position where the air flow outlets a and b are on the upper side, it sprays a double-strand air flow to the filament bundle.

[0034] The tow is divided into a left tow, a middle tow, and a right tow arranged in sequence from left to right in the left-right direction. A single-strand air flow acts on the entire tow. The entire tow vibrates at a high frequency and exchanges positions under the action of the air flow, forming an entangled structure. However, due to the small fineness per filament and large number of holes of the porous fine-denier polyester filament, a relatively small network compressed air is used, and it is difficult for the left tow and the right tow to effectively form a firm entangled structure with the middle tow. Therefore, it is necessary to effectively exchange the positions and entangle the middle tow and the left tow (right tow); when switching to a double-strand air flow, the two air flows act on the left tow and the right tow, prompting the left tow (right tow) to vibrate at a high frequency, forming 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 reaches a high network degree and good cohesion under a lower network pressure. In addition, in the present invention, the outlet areas of the air flow outlet a and the air flow outlet b are controlled to be small, so that the air flow velocity can be increased, prompting the tows to effectively exchange positions, thereby forming stable network points in the entire tow.

[0035] If the single-strand air flow impact mode is used, in order to achieve a high network, it is usually achieved by increasing the network pressure. However, when increasing the network pressure, for the porous fine-denier polyester filament, the tow is extremely prone to form looped filaments or single-filament breakage problems under the action of high-pressure turbulence. Therefore, the present invention uses a relatively low network compressed air to form network points. The disadvantage of low compressed air is that the vibration frequency of the tow under the action of the compressed air is also small, and it is difficult for the outer tow and the inner tow to exchange positions to form an effective entangled structure. Therefore, the number of network points is small and the network fastness is low.

[0036] If the double-strand air flow impact mode is used, although it can effectively exchange the positions of the middle tow and the left tow (right tow) and form an entangled structure, the area of the double-strand air flow impacting the tow is small, and only the two side parts in the tow can exchange positions and form entanglements under the action of the air pressure, and the middle tow cannot be effectively driven, so that the entanglement of the entire tow cannot be formed.

[0037] In summary, the present method effectively solves the problems in the network processing of the porous fine-denier polyester filament by finely regulating the air flow impact mode, achieves the effect of high network points under low pressure, and improves the network fastness and overall quality of the product.

[0038] Beneficial effects:

[0039] The air jet rotating device included in the networker of the present invention changes the air flow pattern impacting the tow by alternately using single-strand and double-strand air flows to impact the tow, and further breaks the single high-frequency vibration state. This change prompts the tow to form different jittering and entangled forms, achieving high network points and low number of filament loops of the porous fine-denier polyester filament under low pressure, and improving the network fastness and overall quality of the product. Description of the drawings

[0040] Figure 1 It is a schematic diagram of the overall external shape of the networker of the present invention. Among them, the X-axis direction is the left-right direction, the Y-axis direction is the front-back direction, and the Z-axis direction is the up-down direction;

[0041] Figure 2 is Figure 1 the schematic cross-sectional structure diagram along the A-A direction in

[0042] Figure 3 the schematic structural diagram of the jet rotation device of the networker of the present invention;

[0043] Figure 4 the schematic cross-sectional structure diagram of the air flow channel in the jet rotation device of the networker of the present invention;

[0044] Figure 5 the schematic side structure diagram of the jet rotation device of the networker of the present invention;

[0045] Figure 6 the schematic diagram of the air flow direction of the double-hole jet in the air flow channel of the networker of the present invention;

[0046] Figure 7 the schematic diagram of the air flow direction of the single-hole jet in the air flow channel of the networker of the present invention;

[0047] Figure 8 the schematic structural diagram of the jet rotation device of the networker of Comparative Example 1;

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

[0049] The following further elaborates the present invention in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0050] Test methods for relevant performance indicators:

[0051] Network degree: The network degree is measured by the needling method according to the ZF / T 5001 standard. A tow with a length of 1 meter is measured. One end of the tow is fixed. Starting from the fixed end, a needle is used to pierce through the center of the tow and slide downwards. When there is entanglement and resistance in the tow, it is regarded as a network point. Then, starting from below the entanglement, the same method is used to operate until the 1-meter-long tow is tested. The number of entanglements is counted. Each tow is tested twice, and the average value of the number of entanglement points in the two tests is the network degree, unit: number per 10,000 meters;

[0052] Number of coiled filaments: It is detected by using a YIS 200 hairiness detector. Using the principle of image method, when the tow continuously passes through the sight glass detection area, the sight glass continuously collects two-dimensional information of the tow and hairiness. Digital processing is performed on the collected image to identify and extract the hairiness on the tow. According to the processed image, the operator counts the number of coiled filaments by viewing and analyzing the tow morphology. The length of the tow for a single test is 10,000 meters, the running speed of the tow is 400 m / min, and counting is performed when the distance sensitivity is set greater than 1500 µm;

[0053] Network fastness: After applying a certain load on the filament of the networked yarn, the percentage of the network degree of the filament after being subjected to a heavy load compared to the network degree before being subjected to the heavy load is the network fastness (St). Test method: Take a 3-meter-long filament to be tested and measure its original network degree N. Then, hang the filament vertically, apply a constant load (load standard is 1.32 cN / dtex) at the bottom of the filament through a weight. After 3 minutes, remove the applied load and measure its residual network degree Nr. The network fastness is calculated through the formula St = (Nr / N) x 100%;

[0054] Number of intermittent jet compressed air and jet intensity: The number of intermittent jet compressed air and jet intensity are detected by setting a pressure sensor on the inner wall of the tow channel perpendicular to the compressed air channel. When the pressure of the compressed air acts on the sensor, the sensitive element metal strain gauge inside it deforms, and this deformation in turn causes a change in the inductance parameter. These pressure changes are converted into measurable electrical signals and output, forming a periodic fluctuation image on the central control display with time as the abscissa and intensity as the ordinate. The peak of the fluctuation image is the jet intensity of the compressed air, and the number of peaks in one minute is the number of intermittent jet compressed air. In addition, a pressure gauge is set on the compressed air channel, and the compressed air pressure in the compressed air channel is consistent with the jet intensity of the networker. The stability of the jet intensity can be judged by checking the displayed data of the pressure gauge;

[0055] Surface roughness Ra value: The surface roughness Ra value is detected by the stylus method, that is, a diamond stylus is gently drawn across the surfaces of the air jet rotating device and the air jet rotating device placement area. When the stylus slides, the surface roughness causes the stylus to move up and down, and this displacement changes the inductance of the inductor coil of the sensor, thereby generating an analog signal proportional to the surface roughness at the output end of the phase-sensitive rectifier; this signal enters the data acquisition system after amplification and level conversion, and the DSP chip performs digital filtering and parameter calculation on the collected data, and finally obtains the Ra value.

[0056] Example 1

[0057] An air-jet texturing device for porous fine denier polyester filaments, as Figures 1 - 2 shown, 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] As Figure 1 shown, the intermediate layer is composed of a non-removable plate 21 and a removable plate 41, and a filament channel 22 with an extending direction parallel to the front-back direction is arranged inside it. There is a gap between the non-removable plate 21 and the removable plate 41, and this gap is the filament inlet 23, and the filament inlet 23 communicates with the filament channel 22;

[0059] As Figure 2 shown, the inner surface of the filament channel 22 is jointly composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is smoothly connected in sequence by a line segment a, an arc line, and a line segment b, the bending direction of the arc line is downward, and the unconnected ends of the line segment a and the line segment b are close to each other; the line segment a is the intersection line of the inclined surface a and the cross-section, the arc line is the intersection line of the arc surface and the cross-section, and the line segment b is the intersection line of the inclined surface b and the cross-section; the lower curved surface arches upward in the front-back direction and arches downward in the left-right direction;

[0060] The length of the filament channel 22 in the front-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] As Figure 2 shown, a compressed air channel 12 with an extending direction parallel to the up-down direction is arranged inside the main body layer 11;

[0062] At the junction of the filament channel 22 and the compressed air channel 12, there are a left groove, a right groove, and an air jet rotating device; the surfaces of the left groove and the right groove are smooth, the surface roughness Ra value is 0.8 μm, and the air jet rotating device is a smooth ceramic part, and the surface roughness Ra value is 1.2 μm;

[0063] As Figures 3 - 5As shown in the figure, the jet rotating device includes a left convex handle, an ellipsoid 51, and a right convex handle 52 arranged in sequence along the left-right direction. The major axis of the ellipsoid 51 is parallel to the left-right direction. Both the left convex handle and the right convex handle 52 are cylindrical structures, with their central axes parallel to the left-right direction and the same size. An air flow channel is provided inside the ellipsoid 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 in a Y shape, with the upper end being an air flow outlet a 532 and an air flow outlet b 533, and the lower end being an air flow outlet c 531. The air flow outlets a 532, b 533, and c 531 are circular or elliptical. The air flow outlets a 532 and 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 ellipsoid 51.

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

[0065] The shape of the left groove is the same as the overall shape formed by the left convex handle and the left end of the ellipsoid 51. The overall shape formed by the left convex handle and the left end of the ellipsoid 51 is embedded in the left groove, and the height of the gap between the two along the up-down direction is 0.05 mm.

[0066] The shape of the right groove is the same as the overall shape formed by the right convex handle 52 and the right end of the ellipsoid 51. The overall shape formed by the right convex handle 52 and the right end of the ellipsoid 51 is embedded in the right groove, and the height of the gap between the two along the up-down direction is 0.05 mm.

[0067] The lower edge of the inclined plane a is directly above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined plane b is directly 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 the central axis parallel to the left-right direction.

[0069] As Figures 6 - 7 shown, it is the flow direction of the air flow 56 in the jet rotating device and the tow channel 22.

[0070] Embodiment 2

[0071] An entangler for porous fine denier polyester filament, as Figures 1 - 2 shown, 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] As shown Figure 1 in the figure, the middle layer is composed of a non-removable plate 21 and a removable plate 41. A tow channel 22 with an extending direction parallel to the front-back direction is arranged inside. There is a gap between the non-removable plate 21 and the removable plate 41, and this gap is the tow inlet 23, and the tow inlet 23 is communicated with the tow channel 22;

[0073] As shown Figure 2 in the figure, the inner surface of the tow channel 22 is jointly composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is smoothly connected in sequence by a line segment a, an arc line, and a line segment b. The bending direction of the arc line is downward, and the unconnected ends of the line segment a and the line segment b are close to each other; the line segment a is the intersection line of the inclined surface a and the section, the arc line is the intersection line of the arc surface and the section, and the line segment b is the intersection line of the inclined surface b and the section; the lower curved surface arches upward in the front-back direction and arches downward in the left-right direction;

[0074] The length of the tow channel 22 in the front-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] As shown Figure 2 in the figure, a compressed air channel 12 with an extending direction parallel to the up-down direction is arranged inside the main body layer 11;

[0076] At the junction of the tow channel 22 and the compressed air channel 12, there are a left groove, a right groove, and a jet rotation device; the surfaces of the left groove and the right groove are treated smoothly, and the surface roughness Ra value is 0.9 μm. The jet rotation device is a ceramic part with a smooth surface, and the surface roughness Ra value is 1.5 μm;

[0077] As shown Figures 3 - 5 in the figure, the jet rotation device includes a left convex handle, an elliptical ball 51, and a right convex handle 52 arranged in sequence in the left-right direction. The major axis of the elliptical ball 51 is parallel to the left-right direction; both the left convex handle and the right convex handle 52 are cylindrical structures, the central axes are parallel to the left-right direction and have the same size; an air flow channel is arranged inside 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 in a Y shape, the upper end is an air flow outlet a 532 and an air flow outlet b 533, and the lower end is an 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 in 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 in the left - right direction is 12 mm, the major - axis length L4 of the ellipsoid 51 is 10 mm, the minor - axis length L7 of the ellipsoid 51 is 7 mm, the width L3 of the air - flow outlet c 531 in the left - right direction is 5 mm, the width L2 of the air - flow outlet a 532 in the left - right direction is 2 mm, the width L1 of the air - flow outlet b 533 in the left - right direction is 2 mm, and the diameter L6 of the right convex handle 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 ellipsoid 51. The whole formed by the left convex handle and the left end of the ellipsoid 51 is embedded in the left groove, and the height of the gap between them in the up - down direction is 0.05 mm;

[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 ellipsoid 51. The whole formed by the right convex handle 52 and the right end of the ellipsoid 51 is embedded in the right groove, and the height of the gap between them in the up - down direction is 0.05 mm;

[0081] The lower edge of the inclined plane a is directly above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined plane b is directly 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 the central axis parallel to the left - right direction;

[0083] As Figures 6 - 7 shown, it is the flow direction of the air - flow 56 in the jet rotating device and the tow channel 22.

[0084] Embodiment 3

[0085] A texturing device for porous fine - denier polyester filament, as Figures 1 - 2 shown, 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] As Figure 1 shown, the intermediate layer is composed of a non - detachable plate 21 and a detachable plate 41. A tow channel 22 with an extension direction parallel to the front - back direction is arranged inside it. There is a gap between the non - detachable plate 21 and the detachable plate 41, and this gap is the tow inlet 23. The tow inlet 23 is communicated with the tow channel 22;

[0087] As Figure 2As shown, the inner surface of the tow channel 22 is jointly composed of an upper curved surface and a lower curved surface; the upper curved surface is composed of an inclined surface a, an arc surface, and an inclined surface b; the front edge or the rear edge of the upper curved surface is formed by the smooth transition connection of a line segment a, an arc line, and a line segment b 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 arches upward in the front-rear direction and arches downward in the left-right direction;

[0088] The length of the tow channel 22 in the front-rear 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] As Figure 2 shown, an air compression channel 12 with an extension direction parallel to the up-down direction is arranged inside the main body layer 11;

[0090] At the junction of the tow channel 22 and the air compression channel 12, there are a left groove, a right groove, and a jet rotation device; the surfaces of the left groove and the right groove are smooth, the surface roughness Ra value is 1 μm, and the jet rotation device is a smooth ceramic part, and the surface roughness Ra value is 2 μm;

[0091] As Figures 3 - 5 shown, the jet rotation device includes a left convex handle, an ellipsoid 51, and a right convex handle 52 arranged in sequence in the left-right direction, and the long axis of the ellipsoid 51 is parallel to the left-right direction; both the left convex handle and the right convex handle 52 are cylindrical structures, the central axis is parallel to the left-right direction and the sizes are the same; an air flow channel is arranged inside the ellipsoid 51, and the air flow channel is the only channel between the tow channel 22 and the air compression channel 12; the air flow channel is in a Y shape, the upper end is an air flow outlet a 532 and an air flow outlet b 533, the lower end is an air flow outlet c 531, and 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 in 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 ellipsoid 51;

[0092] The length L5 of the jet rotation device in the left-right direction is 15 mm, the long axis length L4 of the ellipsoid 51 is 12 mm, the short axis length L7 of the ellipsoid 51 is 8 mm, the width L3 of the air flow outlet c 531 in the left-right direction is 6 mm, the width L2 of the air flow outlet a 532 in the left-right direction is 3 mm, the width L1 of the air flow outlet b 533 in the left-right direction is 3 mm, and the diameter L6 of the right convex handle 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 ellipsoid 51. The whole formed by the left convex handle and the left end of the ellipsoid 51 is embedded in the left groove, and the height of the gap between the two in the up and down direction is 0.1 mm;

[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 ellipsoid 51. The whole formed by the right convex handle 52 and the right end of the ellipsoid 51 is embedded in the right groove, and the height of the gap between the two in the up and down direction is 0.1 mm;

[0095] The lower edge of the inclined plane a is directly above the junction of the left convex handle and the ellipsoid 51, and the lower edge of the inclined plane b is directly 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 the central axis parallel to the left and right direction;

[0097] As Figures 6 - 7 shown, it is the flow direction of the air flow 56 in the jet rotating device and the tow channel 22.

[0098] Example 4

[0099] A method for adding network points to porous fine denier polyester filaments uses the networker for porous fine denier polyester filaments in Example 1. The porous fine denier polyester filaments are passed through the tow channel 22, and compressed air is continuously introduced into the compressed air channel 12; among them, the winding speed is 5500 m / min, the winding tension is 10 cN, and the network pressure is 2 bar.

[0100] The specifications of the obtained porous fine denier polyester filaments are 55 dtex / 144 f. After the tow leaves the tow channel 22, the network degree is 30 pieces / meter, the number of coiled filaments is 1 piece / 10,000 meters, and the network fastness is 93%.

[0101] Example 5

[0102] A method for adding network points to porous fine denier polyester filaments uses the networker for porous fine denier polyester filaments in Example 2. The porous fine denier polyester filaments are passed through the tow channel 22, and compressed air is continuously introduced into the compressed air channel 12; among them, the winding speed is 4000 m / min, the winding tension is 22 cN, and the network pressure is 2.7 bar.

[0103] The specifications of the obtained porous fine denier polyester filaments are 150 dtex / 384 f. After the tow leaves the tow channel 22, the network degree is 20 pieces / meter, the number of coiled filaments is 1 piece / 10,000 meters, and the network fastness is 90%.

[0104] Comparative Example 1

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

[0106] Pass the porous fine denier polyester filaments through the filament bundle channel, and continuously introduce compressed air into the compressed air channel; among them, the winding speed is 4000 m / min, the winding tension is 22 cN, and the network pressure is 2.7 bar.

[0107] The prepared porous fine denier polyester filaments have a specification of 150 dtex / 384 f. After the filament bundle leaves the filament bundle channel, the network degree is 13 per meter, the number of loop filaments 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 loop filaments is 3 times that of Example 5, and the network fastness is decreased by 21%. This is because the number of single filaments in the porous fine denier filaments is large, and the air flow channel of the air jet rotating device in Comparative Example 1 is a single-hole structure. It is difficult for the single-hole jet air flow to gather the single filaments dispersed on both sides of the filament bundle and form a firm network structure with the whole bundle of filaments. In contrast, in Example 5, by alternately jetting air through single and double holes, the porous fine denier filaments can be well aggregated in the network device and the positions of the single filaments can be exchanged 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 adding network points to porous fine denier polyester filaments uses a network device for porous fine denier polyester filaments in Example 3. Pass the porous fine denier polyester filaments through the filament bundle channel 22, and continuously introduce compressed air into the compressed air channel 12; among them, the winding speed is 3200 m / min, the winding tension is 40 cN, and the network pressure is 3 bar.

[0111] The prepared porous fine denier polyester filaments have a specification of 275 dtex / 576 f. After the filament bundle leaves the filament bundle channel 22, the network degree is 15 per meter, the number of loop filaments 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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