Polyester low-tension interlacing method
By installing a tensioning guide in the production of polyester DTY yarn, the frictional force is used to counteract the stretching force of polyester, thus solving the problem of poor pre-networking effect caused by excessive tension in the production of polyester DTY yarn, and achieving low-tension and high-efficiency production.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- JIANGSU HENGLI CHEM FIBER
- Filing Date
- 2025-12-23
- Publication Date
- 2026-07-23
AI Technical Summary
In the production of polyester DTY yarn, space constraints prevent the addition of zero rollers, which affects the pre-networking effect. Existing technologies make it difficult to reduce the tension of polyester without changing the roller speed.
A tensioning guide is installed between the first and second rollers. The friction between the tensioning guide and the polyester is used to counteract part of the stretching force on the polyester. The tension of the polyester is reduced by adjusting the relationship between the friction and the angle.
It significantly reduces the tension of polyester between the two rollers, improves the pre-networking effect, and enables efficient production without adjusting the roller speed or adding equipment.
Smart Images
Figure CN2025144720_23072026_PF_FP_ABST
Abstract
Description
A method for adding a network to low-tension polyester Technical Field
[0001] This invention belongs to the field of fiber production technology and relates to a method for adding a network to polyester with low tension. Background Technology
[0002] Polyester drawn textured yarn (DTY) is a high-performance fiber widely used in the textile industry. By adding a network during its production process, the yarn's bundle properties can be significantly improved, facilitating subsequent weaving operations and giving the fabric a variety of styles. Heavy network yarns also have the advantage of eliminating the need for sizing in subsequent weaving processes. Therefore, adding a network is commonly chosen in the production of polyester DTY to enhance product performance.
[0003] The networking process for polyester DTY yarn is typically divided into two stages: pre-networking and intermediate networking. Pre-networking usually occurs before the stretching and false twisting processes, with the networking nozzle generally positioned between the guide tube outlet of the texturing machine and the first roller. However, due to the speed difference (i.e., draw ratio) between the first and second rollers, significant tension can easily form, negatively impacting the pre-networking effect. To improve the pre-networking effect, some products add a zero roller and position the networking nozzle between the zero roller and the first roller. This ensures a more stable state for the yarn when forming the network structure, as the yarn's tension, speed, and position are better controlled and adjusted after passing through the zero roller, allowing the networking nozzle to more accurately spray airflow and form uniform and stable network points. However, in certain models, such as the TMT ATF-1500FDOUR texturing machine, space constraints make adding a zero roller impractical, limiting its application.
[0004] Therefore, it is necessary to propose a method that can achieve better pre-network results without adding zero rollers. Summary of the Invention
[0005] The purpose of this invention is to solve the problems existing in the prior art and to provide a method for adding a network to polyester with low tension.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0007] A method for adding a low-tension polyester web involves installing a first web nozzle and at least one tensioning guide between a first roller and a second roller. The friction between the tensioning guide and the polyester counteracts part of the stretching force on the polyester, thereby reducing the tension of the polyester between the first roller and the second roller when the web is added via the first web nozzle. As shown in Figure 2, the stretching force on the polyester between the first roller and the second roller is denoted as F_stretching force, the force on the yarn in contact with the surface of the tensioning guide is denoted as F_n support force, and the friction between the tensioning guide and the polyester is denoted as F_friction force. F_friction force is decomposed into F1 and F2, with F1 in the opposite direction to F_stretching force. The tension of the polyester between the first roller and the second roller = F_stretching force - F1. When there is no tensioning guide, F1 = 0, and the tension of the polyester between the first roller and the second roller is relatively high. When there is a tensioning guide, F1 > 0, and the tension of the polyester between the first roller and the second roller is relatively low.
[0008] As a preferred technical solution:
[0009] In the method described above for adding a network to low-tension polyester, the ratio of the rotational speeds of the first roller and the second roller is 1.5-1.85, and the linear density of the polyester is 350 dtex. When no tension guide is installed between the first roller and the second roller, the tension of the polyester between the first roller and the second roller mainly depends on the ratio of the rotational speeds of the first roller and the second roller and the denier of the polyester. When the ratio of the rotational speeds of the first roller and the second roller is 1.5-1.85 and the linear density of the polyester is 350 dtex, the tension of the polyester between the first roller and the second roller is 0.25 N, which is relatively high and makes it difficult to add a network.
[0010] As described above, in a method for adding a low-tension polyester yarn network, the tensioning guide is a concave open titanium dioxide tensioning guide. For tensioning guides made of different materials, the higher the coefficient of friction of the tensioning guide material, the more obvious the effect of reducing the tension of the polyester.
[0011] In the method described above for adding a low-tension polyester network, the polyester length between the first roller and the second roller is 6m.
[0012] As described above, in a method for adding a low-tension polyester web, there is one tensioning guide. The first roller, the first web nozzle, and the tensioning guide are arranged at intervals along the yarn feeding direction. The friction coefficient of the tensioning guide is 0.2-0.7. The angle between the polyester and the horizontal lines of the inlet and outlet of the first web nozzle is 45-90°. The wrap angle of the polyester when passing through the tensioning guide is 90-135°. The wrap angle of the polyester when passing through the tensioning guide is positively correlated with the contact area. Generally, the larger the wrap angle, the larger the contact area, the greater the frictional resistance, and the more effectively the tension of the polyester can be reduced.
[0013] In the method of adding a low-tension polyester network as described above, the polyester length between the first roller and the first network nozzle is 1 / 24 to 1 / 12 of the polyester length between the first roller and the second roller; the polyester length between the first network nozzle and the tensioning guide is 1 / 60 to 1 / 30 of the polyester length between the first roller and the second roller.
[0014] As described above, a method for adding a low-tension polyester web is used. The first web nozzle is a Haibolin P213 with a diameter of 1.6 mm and an elliptical shape. The tension of the polyester at the inlet is 4-5 cN (11-13 cN if there is no tensioning guide). The web air pressure at the first web nozzle is 1.1-1.3 bar (2.4 bar if there is no tensioning guide). The web density of the polyester at the outlet is 45-50 webs / m. The web strength is light web grade, meaning that after applying a force of 8 cN and tensioning and relaxing three times, there is no web detachment, which meets production needs.
[0015] As described above, in a method for adding a low-tension polyester yarn network, there are two tensioning guides: a first roller, a first network nozzle, a first tensioning guide, and a second tensioning guide are arranged at intervals along the yarn feeding direction; the friction coefficient of each tensioning guide is 0.2-0.7; the angle between the polyester and the horizontal lines of the inlet and outlet of the first network nozzle is 30-90°; the wrap angle of the polyester when passing through the first tensioning guide is 90-150°; the wrap angle of the polyester when passing through the second tensioning guide is 90-150°; the wrap angle of the polyester when passing through the tensioning guide is positively correlated with the contact area. Generally, the larger the wrap angle, the larger the contact area, the greater the frictional resistance, and the more effectively the polyester tension is reduced. When there are two tensioning guides, the effect of reducing polyester tension is cumulative.
[0016] In the method for adding a low-tension polyester web as described above, the polyester length between the first roller and the first web nozzle is 1 / 24 to 1 / 12 of the polyester length between the first roller and the second roller; the polyester length between the first web nozzle and the first tensioning guide is 1 / 60 to 1 / 30 of the polyester length between the first roller and the second roller; and the polyester length between the first tensioning guide and the second tensioning guide is 1 / 120 to 1 / 60 of the polyester length between the first roller and the second roller.
[0017] As described above, a method for adding a low-tension polyester network involves using a Haibolin P213 nozzle with a 1.6mm orifice and an elliptical shape. The polyester tension at the inlet is 3-4 cN (11-13 cN if there is no tensioning guide), and the network air pressure at the first network nozzle is 0.6-1.0 bar (2.4 bar if there is no tensioning guide). The polyester network density at the outlet is 50-55 dots / m, and the network point strength is at the light network level, meaning that after applying 8 cN of force and tensioning and relaxing three times, there is no network slippage, which meets production requirements.
[0018] As described above, in a method for adding a low-tension polyester yarn network, there are three tensioning guides: a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, and a third tensioning guide, arranged at intervals along the yarn feeding direction. The friction coefficient of each tensioning guide is 0.2-0.7. The angle between the polyester and the horizontal lines of the inlet and outlet of the first network nozzle is 15-90°. The wrap angle of the polyester when passing through the first tensioning guide is 90-165°, the wrap angle of the polyester when passing through the second tensioning guide is 90-165°, and the wrap angle of the polyester when passing through the third tensioning guide is 90-165°. The wrap angle of the polyester when passing through the tensioning guide is positively correlated with the contact area. Generally, the larger the wrap angle, the larger the contact area, the greater the frictional resistance, and the more effectively the polyester tension is reduced. When there are three tensioning guides, the effect of reducing polyester tension is cumulative.
[0019] In the method described above for adding a low-tension polyester web, the polyester length between the first roller and the first web nozzle is 1 / 24 to 1 / 12 of the polyester length between the first roller and the second roller; the polyester length between the first web nozzle and the first tensioning guide is 1 / 60 to 1 / 30 of the polyester length between the first roller and the second roller; the polyester length between the first tensioning guide and the second tensioning guide is 1 / 120 to 1 / 60 of the polyester length between the first roller and the second roller; and the polyester length between the second tensioning guide and the third tensioning guide is 1 / 120 to 1 / 60 of the polyester length between the first roller and the second roller.
[0020] The method described above for adding a low-tension polyester web involves using a Haibolin P213 nozzle with a 1.6mm orifice and an elliptical shape. The polyester tension at the inlet is 1.5-3cN (11-13cN if there is no tensioning guide), and the web pressure at the first web nozzle is 0.4-0.6bar (2.4bar if there is no tensioning guide). The polyester web density at the outlet is 55-60 weblets / m, and the web strength is at the light web level, meaning that after applying 8cN of force and tensioning and relaxing three times, there is no web detachment, which meets production requirements.
[0021] The method of adding a network to polyester with low tension, as described above, is not limited to the production of polyester civilian filament POY, FDY, and DTY filaments, but is also applicable to the production of industrial filaments and the double twisting process of industrial filaments. It is also applicable to the downstream weaving of chemical fibers such as nylon, acrylic, spandex, and polypropylene.
[0022] As described above, a method for adding a low-tension polyester web can be used to install more tension guides between the two rollers, depending on the machine model and installation space, in order to meet the special tension requirements when adding the web at the first web nozzle. Beneficial effects
[0023] This invention utilizes the friction between the tension guide and the polyester to counteract part of the stretching force on the polyester by installing a tension guide and at least one mesh nozzle between the first and second rollers. This significantly reduces the tension of the polyester between the two rollers without changing the roller speed, thereby improving the pre-networking effect.
[0024] The method for adding a low-tension polyester network according to the present invention is simple to implement, requires no adjustment of roller speed or addition of extra equipment, and greatly improves production efficiency and flexibility.
[0025] The method for adding a low-tension polyester network according to the present invention has a wide range of applications and can be applied to various types of textile machinery. Attached Figure Description
[0026] Figure 1 is a schematic diagram of the preparation of polyester DTY yarn in Embodiment A1 of the present invention;
[0027] Figure 2 is a schematic diagram of the force analysis of the wire;
[0028] Figure 3 is a schematic diagram of the tensioning guide wire device of Embodiment A1 of the present invention; wherein, (a) is a front view and (b) is a cross-sectional view (along the AA direction in (a));
[0029] Figure 4 is a schematic diagram of the connection relationship between the tensioning guide, the fixing bracket, and the strip-shaped connector when installing the tensioning guide in Embodiment A1 of the present invention.
[0030] Figure 5 is a schematic diagram of the installation of the tensioning guide in Embodiment A1 of the present invention. In the figure, ∠1 is the angle between the polyester yarn and the horizontal lines of the inlet and outlet of the first network nozzle, and ∠2 is the wrap angle of the polyester POY yarn when it passes through the tensioning guide.
[0031] Among them, 1-polyester POY yarn, 2-polyester FDY yarn, 3-first roller, 4-first network nozzle, 5-tension guide, 7-first heating box, 8-cooling plate, 9-false twister, 10-tension meter, 11-second roller, 12-second network nozzle, 13-auxiliary roller, 14-second heating box, 15-third roller, 16-upper oil roller, 17-yarn spool, 18-polyester DTY yarn, 19-lifting screw fixing crossbar, 20-second screw hole, 21-lifting screw, 23-skin roller, 25-pre-network compression tube, 26-second screw, 31-first screw hole, 32-fixed bracket, 33-first screw, 34-strip connector. Embodiments of the present invention
[0032] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.
[0033] The following are the test methods for the relevant performance indicators in each embodiment and comparative example:
[0034] Network density and network spot fastness: The network density tester (manufacturer: Changzhou Bafang Lishi Textile Instrument Co., Ltd., model BF1801) was used for the test. The test length was 1m, the test speed was 2.5m / min, the release force was 0.3cN / dtex, and the pretension was 0.1cN / dtex.
[0035] Linear density, breaking strength, and elongation at break: determined in accordance with GB / T14343-2008 standard; wherein the test temperature is 25℃, the test humidity is 65%, the pre-tension is 0.2cN / dtex, the test speed is 500mm / min, and the clamping length is 500mm.
[0036] Curl shrinkage rate: determined according to GB / T6506-2017 standard; wherein the test temperature is 25℃ and the test humidity is 65%.
[0037] Boiling water shrinkage rate: determined according to GB / T6505-2017 standard; wherein the test temperature is 25℃, the test humidity is 65%, and the loading tension is 0.2cN / dtex. Example A1
[0038] A method for preparing polyester DTY yarn, as shown in Figure 1, involves feeding polyester POY yarn 1 (350 dtex / 96f) sequentially through a first roller 3, a first network nozzle 4, a tension guide 5, a first heating box 7, a cooling plate 8, a false twister 9, a tension meter 10, and a second roller 11 into a second network nozzle 12. Simultaneously, polyester FDY yarn 2 (110 dtex / 36f) is fed sequentially through a first roller 3, a tension meter 10, and a second roller 11 into a second network nozzle 12. Then, polyester POY yarn 1 and polyester FDY yarn 2 are sequentially wound onto a yarn bobbin 17 through an auxiliary roller 13, a second heating box 14, a third roller 15, and an upper oil roller 16 to obtain polyester DTY yarn 18.
[0039] As shown in Figure 5, a leather roller 23 is provided above the first roller 3; the first network nozzle 4 is a Haibolin P213 with a diameter of 1.6 mm and an elliptical shape, and the first network nozzle 4 is connected to the pre-network compressed air tube 25; the tensioning guide 5 is a concave open titanium dioxide tensioning guide, the structure of which is shown in Figure 3, and the friction coefficient of the tensioning guide 5 is 0.2; as shown in Figure 4, the tensioning guide 5 is installed on the fixed bracket 32, and the fixed bracket 32 is fixed to the strip-shaped connector 34 by the cooperation of the first screw 33 and the first screw hole 31; as shown in Figure 5, each end of the strip-shaped connector 34 is connected to a lifting rod fixing crossbar 19 through the second screw 26 and the second screw hole 20, and the position of the strip-shaped connector 34 along the length direction of the lifting rod fixing crossbar 19 is adjustable. One end of the lifting rod fixing crossbar 19 is connected to the lifting rod 21, and the lifting rod 21 is used to send the polyester POY yarn that has passed through the tensioning guide 5 to the inlet of the first hot box 7;
[0040] The angle ∠1 between the polyester POY filament and the horizontal lines of the inlet and outlet of the first network nozzle 4 is 45°; the wrap angle ∠2 of the polyester POY filament when passing through the tensioning guide 5 is 135°; the ratio of the rotational speeds of the first roller 3 and the second roller 11 is 1.5; the polyester length between the first roller 3 and the second roller 11 is 6m; the polyester length between the first roller 3 and the first network nozzle 4 is 0.25m; and the polyester length between the first network nozzle 4 and the tensioning guide 5 is 0.1m.
[0041] Other process parameters are as follows: first network nozzle 4 network air pressure 1.3 bar, machine speed 600 m / min, first hot box 7 temperature 183℃, second hot box 14 temperature 156℃, network overfeed 3.9%, shaping overfeed 0.9%, winding overfeed 0.25%, second network nozzle 12 network air pressure 2.8 bar.
[0042] Tests show that the tension of polyester POY yarn 1 at the inlet of the first network nozzle 4 is 5.0 cN; the network density of polyester POY yarn 1 at the outlet of the first network nozzle 4 is 45 yarns / m, and the network point fastness is light network grade; the final polyester DTY yarn has a linear density of 326.08 dtex, a breaking strength of 3.14 cN / dtex, a breaking elongation of 30.37%, a network density of 88 yarns / m, a crimp shrinkage rate of 5.42%, and a boiling water shrinkage rate of 7.71%.
[0043] Comparative Example 1
[0044] A method for preparing polyester DTY yarn is basically the same as in Example A1, except that there is no tensioning guide between the first network nozzle and the first heating box; and the network air pressure of the first network nozzle is 2.4 bar.
[0045] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 13cN; the network density of the polyester POY yarn at the outlet of the first network nozzle is 8 points / m, and the network point fastness is at the no-network level.
[0046] Compared with Comparative Example 1 and Example A1, the network air pressure of the first network nozzle and the tension of the polyester POY yarn at the inlet of the first network nozzle are significantly increased, while the network density and network point firmness of the polyester POY yarn at the outlet of the first network nozzle are significantly reduced. This is because Comparative Example 1 did not install a tensioning guide between the first roller and the second roller, which means that when the polyester POY yarn passes through the first network nozzle, it cannot use the friction between the tensioning guide and the polyester to offset part of the stretching force. As a result, the tension of the polyester POY yarn between the first roller and the second roller was not effectively reduced, affecting the pre-networking effect. Example A2
[0047] A method for preparing polyester DTY yarn is basically the same as in Example A1, except that the tensioning guide is made of aluminum oxide and has a friction coefficient of 0.15.
[0048] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 10cN; the network density of the polyester POY yarn at the outlet of the first network nozzle is 30 dots / m, and the network point fastness is light network grade.
[0049] Compared with Example A1, Example A2 has a slightly worse pre-network effect. This is because the friction coefficient of the alumina tensioning guide is small, resulting in less frictional resistance applied to the polyester POY yarn and a weaker effect in reducing the tension of the polyester POY yarn. Example A3
[0050] A method for preparing polyester DTY yarn is basically the same as in Example A1, except that the angle between the polyester POY yarn and the horizontal line of the inlet and outlet of the first network nozzle is 10°.
[0051] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 5cN; the network density of the polyester POY yarn at the outlet of the first network nozzle is 38 points / m, and the network point fastness is light network grade. Example A4
[0052] A method for preparing polyester DTY yarn is basically the same as in Example A1, except that the angle between the polyester POY yarn and the horizontal line of the inlet and outlet of the first network nozzle is 135°.
[0053] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 3.5 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle is 42 dots / m, and the network point fastness is light network grade. Example A5
[0054] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a tension guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then wound onto a yarn bobbin sequentially through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0055] The first network nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape; the tensioning guide is a concave-opening titanium dioxide tensioning guide with a friction coefficient of 0.4; the angle between the polyester POY yarn and the horizontal lines of the inlet and outlet of the first network nozzle is 60°; the wrap angle of the polyester POY yarn when passing through the tensioning guide is 120°; the ratio of the rotational speeds of the first roller and the second roller is 1.72; the polyester length between the first roller and the second roller is 6 m; the polyester length between the first roller and the first network nozzle is 0.35 m; and the polyester length between the first network nozzle and the tensioning guide is 0.15 m.
[0056] Other process parameters are as follows: first-stage network nozzle network air pressure 1.2 bar, machine speed 600 m / min, first hot box temperature 183℃, second hot box temperature 156℃, network overfeed 3.9%, shaping overfeed 0.9%, winding overfeed 0.25%, and second-stage network nozzle network air pressure 2.8 bar.
[0057] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 4.5 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 48 dots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 326 dtex, a breaking strength of 3.05 cN / dtex, a breaking elongation of 30.02%, a network density of 84 dots / m, a crimp shrinkage of 5.44%, and a boiling water shrinkage of 7.55%. Example A6
[0058] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a tension guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then wound onto a yarn bobbin sequentially through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0059] The first network nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape; the tensioning guide is a concave-opening titanium dioxide tensioning guide with a friction coefficient of 0.7; the angle between the polyester POY yarn and the horizontal lines of the inlet and outlet of the first network nozzle is 90°; the wrap angle of the polyester POY yarn when passing through the tensioning guide is 90°; the ratio of the rotational speeds of the first roller and the second roller is 1.85; the polyester length between the first roller and the second roller is 6 m; the polyester length between the first roller and the first network nozzle is 0.5 m; and the polyester length between the first network nozzle and the tensioning guide is 0.2 m.
[0060] Other process parameters are as follows: first-stage network nozzle network air pressure 1.1 bar, machine speed 600 m / min, first hot box temperature 183℃, second hot box temperature 156℃, network overfeed 3.9%, shaping overfeed 0.9%, winding overfeed 0.25%, and second-stage network nozzle network air pressure 2.8 bar.
[0061] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 4.0 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 50 dots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 327.63 dtex, a breaking strength of 3.01 cN / dtex, a breaking elongation of 29.13%, a network density of 83 dots / m, a crimp shrinkage of 5.35%, and a boiling water shrinkage of 7.77%. Example B1
[0062] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then sequentially wound onto a yarn bobbin through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0063] The first network nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape. Both the first and second tensioning guides are concave-opening titanium dioxide tensioning guides, with a friction coefficient of 0.2. The angle between the polyester POY yarn and the horizontal lines of the inlet and outlet of the first network nozzle is 30°. The wrap angle of the polyester POY yarn as it passes through the first and second tensioning guides is 150°. The speed ratio of the first roller to the second roller is 1.5, and the polyester length between the first and second rollers is 6 m. The polyester length between the first roller and the first network nozzle is 0.25 m. The polyester length between the first network nozzle and the first tensioning guide is 0.1 m. The polyester length between the first tensioning guide and the second tensioning guide is 0.05 m.
[0064] Other process parameters are as follows: first-stage network nozzle network air pressure 1.0 bar, machine speed 600 m / min, first hot box temperature 183℃, second hot box temperature 156℃, network overfeed 3.9%, shaping overfeed 0.9%, winding overfeed 0.25%, and second-stage network nozzle network air pressure 2.8 bar.
[0065] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 4.0 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 50 dots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 326.08 dtex, a breaking strength of 3.14 cN / dtex, a breaking elongation of 30.37%, a network density of 88 dots / m, a crimp shrinkage of 5.42%, and a boiling water shrinkage of 7.71%. Example B2
[0066] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then sequentially wound onto a yarn bobbin through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0067] The first mesh nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape. Both the first and second tensioning guides are concave-opening titanium dioxide tensioning guides, with a friction coefficient of 0.4. The angle between the polyester POY yarn and the horizontal lines of the inlet and outlet of the first mesh nozzle is 60°. The wrap angle of the polyester POY yarn as it passes through the first and second tensioning guides is 120°. The speed ratio of the first roller to the second roller is 1.72, and the polyester length between the first and second rollers is 6 m. The polyester length between the first roller and the first mesh nozzle is 0.35 m. The polyester length between the first mesh nozzle and the first tensioning guide is 0.15 m. The polyester length between the first tensioning guide and the second tensioning guide is 0.07 m.
[0068] Other process parameters are as follows: first-stage network nozzle network air pressure 0.8 bar, machine speed 600 m / min, first hot box temperature 183℃, second hot box temperature 156℃, network overfeed 3.9%, shaping overfeed 0.9%, winding overfeed 0.25%, and second-stage network nozzle network air pressure 2.8 bar.
[0069] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 3.5 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 52 knots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 326 dtex, a breaking strength of 3.05 cN / dtex, a breaking elongation of 30.02%, a network density of 84 knots / m, a crimp shrinkage of 5.44%, and a boiling water shrinkage of 7.55%. Example B3
[0070] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then sequentially wound onto a yarn bobbin through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0071] The first mesh nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape. Both the first and second tensioning guides are concave-opening titanium dioxide tensioning guides, with a friction coefficient of 0.7 for both. The angle between the polyester POY yarn and the horizontal lines at the inlet and outlet of the first mesh nozzle is 90°. The wrap angle of both the first and second tensioning guides is 90°. The speed ratio of the first roller to the second roller is 1.85, and the polyester length between the first and second rollers is 6 m. The polyester length between the first roller and the first mesh nozzle is 0.5 m. The polyester length between the first mesh nozzle and the first tensioning guide is 0.2 m. The polyester length between the first tensioning guide and the second tensioning guide is 0.1 m.
[0072] Other process parameters are as follows: first-stage network nozzle network air pressure 0.6 bar, machine speed 600 m / min, first hot box temperature 183℃, second hot box temperature 156℃, network overfeed 3.9%, shaping overfeed 0.9%, winding overfeed 0.25%, and second-stage network nozzle network air pressure 2.8 bar.
[0073] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 3.0 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 55 dots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 327.63 dtex, a breaking strength of 3.01 cN / dtex, a breaking elongation of 29.13%, a network density of 83 dots / m, a crimp shrinkage of 5.35%, and a boiling water shrinkage of 7.77%. Example C1
[0074] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, a third tensioning guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then sequentially wound onto a yarn bobbin through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0075] The first network nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape. The first, second, and third tensioning guides are all concave-opening titanium dioxide tensioning guides, with a friction coefficient of 0.2 for each. The angle between the polyester POY yarn and the horizontal lines at the inlet and outlet of the first network nozzle is 15°. The polyester POY yarn passes through the first, second, and third tensioning guides... The wrap angle of all three tensioning guides is 165°; the ratio of the rotational speeds of the first roller to the second roller is 1.5; the polyester length between the first roller and the second roller is 6m; the polyester length between the first roller and the first mesh nozzle is 0.25m; the polyester length between the first mesh nozzle and the first tensioning guide is 0.1m; the polyester length between the first tensioning guide and the second tensioning guide, and between the second tensioning guide and the third tensioning guide, is 0.05m.
[0076] Other process parameters are as follows: the network air pressure of the first network nozzle is 0.6 bar, the machine speed is 600 m / min, the temperature of the first hot box is 183℃, the temperature of the second hot box is 156℃, the network overfeed is 3.9%, the shaping overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.
[0077] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 3.0 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 55 dots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 326.08 dtex, a breaking strength of 3.14 cN / dtex, a breaking elongation of 30.37%, a network density of 88 dots / m, a crimp shrinkage of 5.42%, and a boiling water shrinkage of 7.71%. Example C2
[0078] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, a third tensioning guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then sequentially wound onto a yarn bobbin through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0079] The first network nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape. The first, second, and third tensioning guides are all concave-opening titanium dioxide tensioning guides, with a friction coefficient of 0.4 for each. The angle between the polyester POY yarn and the horizontal lines of the inlet and outlet of the first network nozzle is 50°. The polyester POY yarn passes through the first, second, and third tensioning guides... The wrap angle of the tensioning guide is 130°; the ratio of the rotational speed of the first roller to the second roller is 1.72; the polyester length between the first roller and the second roller is 6m; the polyester length between the first roller and the first mesh nozzle is 0.35m; the polyester length between the first mesh nozzle and the first tensioning guide is 0.15m; the polyester length between the first tensioning guide and the second tensioning guide, and between the second tensioning guide and the third tensioning guide are all 0.07m.
[0080] Other process parameters are as follows: the network air pressure of the first network nozzle is 0.5 bar, the machine speed is 600 m / min, the temperature of the first hot box is 183℃, the temperature of the second hot box is 156℃, the network overfeed is 3.9%, the shaping overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.
[0081] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 2.5 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 57 points / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 326 dtex, a breaking strength of 3.05 cN / dtex, a breaking elongation of 30.02%, a network density of 84 points / m, a crimp shrinkage of 5.44%, and a boiling water shrinkage of 7.55%. Example C3
[0082] A method for preparing polyester DTY yarn involves feeding polyester POY yarn (350 dtex / 96f) sequentially through a first roller, a first network nozzle, a first tensioning guide, a second tensioning guide, a third tensioning guide, a first heating box, a cooling plate, a false twister, a tension meter, and a second roller into a second network nozzle. Simultaneously, polyester FDY yarn (110 dtex / 36f) is fed sequentially through a first roller, a tension meter, and a second roller into a second network nozzle. The polyester POY yarn and polyester FDY yarn are then sequentially wound onto a yarn bobbin through an auxiliary roller, a second heating box, a third roller, and an upper oil roller to obtain polyester DTY yarn.
[0083] The first network nozzle is a Haibolin P213 with an orifice diameter of 1.6 mm and an elliptical shape. The first, second, and third tensioning guides are all concave-opening titanium dioxide tensioning guides, with a friction coefficient of 0.7 for each. The angle between the polyester POY yarn and the horizontal lines of the inlet and outlet of the first network nozzle is 90°. The polyester POY yarn passes through the first and second tensioning guides... The wrap angle of the third tensioning guide is 90°; the ratio of the rotational speed of the first roller to the second roller is 1.85; the polyester length between the first roller and the second roller is 6m; the polyester length between the first roller and the first mesh nozzle is 0.5m; the polyester length between the first mesh nozzle and the first tensioning guide is 0.2m; the polyester length between the first tensioning guide and the second tensioning guide, and between the second tensioning guide and the third tensioning guide are both 0.1m.
[0084] Other process parameters are as follows: the network air pressure of the first network nozzle is 0.4 bar, the machine speed is 600 m / min, the temperature of the first hot box is 183℃, the temperature of the second hot box is 156℃, the network overfeed is 3.9%, the shaping overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.
[0085] Tests showed that the tension of the polyester POY yarn at the inlet of the first network nozzle was 1.5 cN; the network density of the polyester POY yarn at the outlet of the first network nozzle was 60 dots / m, and the network point fastness was light network grade; the final polyester DTY yarn had a linear density of 327.63 dtex, a breaking strength of 3.01 cN / dtex, a breaking elongation of 29.13%, a network point density of 83 dots / m, a crimp shrinkage rate of 5.35%, and a boiling water shrinkage rate of 7.77%.
Claims
1. A method for adding a low-tension polyester network, characterized in that, A first mesh nozzle and at least one tensioning guide are installed between the first roller and the second roller. The friction between the tensioning guide and the polyester is used to offset part of the stretching force on the polyester, thereby reducing the tension of the polyester between the first roller and the second roller when the first mesh nozzle is applied. The first roller and the first network nozzle are arranged sequentially along the wire feeding direction, and each tensioning guide is located between the first network nozzle and the second roller.
2. The method for adding a low-tension polyester network according to claim 1, characterized in that, The ratio of the rotational speeds of the first and second rollers is 1.5-1.85, and the linear density of the polyester is 350 dtex.
3. The method for adding a low-tension polyester network according to claim 2, characterized in that, The tensioning guide is a concave-shaped open titanium dioxide tensioning guide.
4. The method for adding a low-tension polyester network according to claim 3, characterized in that, The polyester length between the first and second rollers is 6m.
5. The method for adding a low-tension polyester network according to claim 4, characterized in that, The number of tensioning guides is one; the friction coefficient of the tensioning guides is 0.2-0.7; the angle between the polyester and the horizontal line of the inlet and outlet of the first network nozzle is 45-90°; and the wrap angle of the polyester when passing through the tensioning guides is 90-135°.
6. The method for adding a low-tension polyester network according to claim 5, characterized in that, The polyester length between the first roller and the first mesh nozzle is 1 / 24 to 1 / 12 of the polyester length between the first roller and the second roller; the polyester length between the first mesh nozzle and the tension guide is 1 / 60 to 1 / 30 of the polyester length between the first roller and the second roller.
7. The method for adding a low-tension polyester network according to claim 6, characterized in that, The first network nozzle has an orifice diameter of 1.6mm and an elliptical shape. The polyester tension at the inlet is 4-5cN, the network air pressure at the first network nozzle is 1.1-1.3bar, the polyester network density at the outlet is 45-50 dots / m, and the network point fastness is light network grade.
8. The method for adding a low-tension polyester network according to claim 4, characterized in that, The number of tensioning guides is two; the friction coefficient of each tensioning guide is 0.2-0.7; the angle between the polyester and the horizontal line of the inlet and outlet of the first network nozzle is 30-90°; the wrap angle of the polyester when passing through the first tensioning guide is 90-150°; the wrap angle of the polyester when passing through the second tensioning guide is 90-150°.
9. The method for adding a low-tension polyester network according to claim 8, characterized in that, The polyester length between the first roller and the first mesh nozzle is 1 / 24 to 1 / 12 of the polyester length between the first roller and the second roller; the polyester length between the first mesh nozzle and the first tensioning guide is 1 / 60 to 1 / 30 of the polyester length between the first roller and the second roller; the polyester length between the first tensioning guide and the second tensioning guide is 1 / 120 to 1 / 60 of the polyester length between the first roller and the second roller.
10. The method for adding a low-tension polyester network according to claim 9, characterized in that, The first network nozzle has an orifice diameter of 1.6mm and an elliptical shape. The polyester tension at the inlet is 3-4cN, the network air pressure at the first network nozzle is 0.6-1.0bar, the polyester network density at the outlet is 50-55 dots / m, and the network dot fastness is light network grade.
11. The method for adding a low-tension polyester network according to claim 4, characterized in that, The number of tensioning guides is three; the friction coefficient of each tensioning guide is 0.2-0.7; the angle between the polyester and the horizontal line of the inlet and outlet of the first network nozzle is 15-90°; the wrap angle of the polyester when passing through the first tensioning guide is 90-165°; the wrap angle of the polyester when passing through the second tensioning guide is 90-165°; and the wrap angle of the polyester when passing through the third tensioning guide is 90-165°.
12. The method for adding a low-tension polyester network according to claim 11, characterized in that, The polyester length between the first roller and the first mesh nozzle is 1 / 24 to 1 / 12 of the polyester length between the first roller and the second roller; the polyester length between the first mesh nozzle and the first tensioning guide is 1 / 60 to 1 / 30 of the polyester length between the first roller and the second roller; the polyester length between the first tensioning guide and the second tensioning guide is 1 / 120 to 1 / 60 of the polyester length between the first roller and the second roller; the polyester length between the second tensioning guide and the third tensioning guide is 1 / 120 to 1 / 60 of the polyester length between the first roller and the second roller.
13. The method for adding a low-tension polyester network according to claim 12, characterized in that, The first network nozzle has an orifice diameter of 1.6mm and an elliptical shape. The polyester tension at the inlet is 1.5-3cN, the network air pressure at the first network nozzle is 0.4-0.6bar, the polyester network density at the outlet is 55-60 dots / m, and the network point fastness is light network grade.