A method for adding network to polyester under low tension

Abstract

The present invention belongs to the technical field of fiber production, and relates to a method for adding a network to polyester with low tension. By installing a first network nozzle and at least one tension guide wire device between a first roller and a second roller, the frictional force between the tension guide wire device and the polyester is used to offset part of the drafting force received by the polyester, thereby reducing the tension of the polyester between the first roller and the second roller when the first network nozzle adds a network. The method for adding a network to polyester with low tension according to the present invention significantly reduces the tension of the polyester between the two rollers without changing the roller speed, thus improving the pre-network effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber production and relates to a method for adding network to polyester with low tension. Background Art

[0002] Polyester drawn textured yarn (referred to as polyester DTY yarn) is a high-performance fiber widely used in the textile industry. By adding network during its production process, the bundling property of the yarn can be significantly improved, facilitating subsequent weaving operations, and at the same time endowing the fabric surface with diverse styles. The heavy network yarn in the network yarn also has the advantage of eliminating the sizing process in the subsequent weaving. Therefore, adding network is generally selected in the production of polyester DTY yarn to enhance product performance.

[0003] The network processing of polyester DTY yarn is usually divided into two stages: pre-network and mid-network. The pre-network is usually carried out before the stretching and false twisting processes, and the network nozzle is generally set between the outlet of the godet tube of the texturing machine and the first roller. However, due to the speed difference (i.e., draw ratio) between the first roller and the second roller, a relatively large tension is easily formed, which will have an adverse effect on the pre-network effect. To improve the pre-network effect, some products will add a zero roller, and at the same time set the network nozzle between the zero roller and the first roller. In this way, it can be ensured that the filament is in a more stable state when forming the network structure, because after the filament passes through the zero roller, its tension, speed and position are better controlled and adjusted, which is conducive to the network nozzle spraying air flow more accurately to form uniform and stable network points. However, in some specific models such as the TMT manufacturer's ATF-1500FDOUR type texturing machine, due to space limitations, adding a zero roller becomes infeasible, which makes its application have certain limitations.

[0004] Therefore, it is necessary to propose a method that can achieve better pre-network effect without adding a zero roller. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for adding network to polyester with low tension.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A method for adding network to polyester with low tension, in which a first network nozzle and at least one tension godet are installed between the first roller and the second roller, and the friction force between the tension godet and the polyester is used to offset part of the draft force received by the polyester, thereby reducing the tension of the polyester between the first roller and the second roller when the first network nozzle adds network; as Figure 2As shown in the figure, the drafting force on the polyester between the first roller and the second roller is denoted as F_drafting force, the force on the filament in contact with the surface of the tensioning guide is denoted as Fn_support force, and the frictional force between the tensioning guide and the polyester is denoted as F_frictional force. F_frictional force will be decomposed into F1 and F2. The direction of F1 is opposite to that of F_drafting force. The tension of the polyester between the first roller and the second roller = F_drafting 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 large. When there is a tensioning guide, F1 > 0, and the tension of the polyester between the first roller and the second roller is relatively small.

[0008] As a preferred technical solution:

[0009] In a method for adding network to polyester with low tension as described above, 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 tensioning 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, and its value is relatively high, making it difficult to add network.

[0010] In a method for adding network to polyester with low tension as described above, the tensioning guide is a concave-opening titanium oxide tensioning guide. For tensioning guides made of different materials, the greater the friction coefficient of the tensioning guide material, the more obvious the effect of reducing the tension of the polyester.

[0011] In a method for adding network to polyester with low tension as described above, the length of the polyester between the first roller and the second roller is 6 m.

[0012] In a method for adding network to polyester with low tension as described above, the number of tensioning guides is one, and the first roller, the first network nozzle, and the tensioning guide are arranged at intervals along the wire feeding direction. The friction coefficient of the tensioning guide is 0.2 - 0.7. The angle between the polyester and the horizontal line at the inlet and outlet of the first network nozzle is 45 - 90°, and 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 effective in reducing the tension of the polyester.

[0013] In a method for adding network to polyester with low tension as described above, the length of the polyester between the first roller and the first network nozzle is 1 / 24 - 1 / 12 of the length of the polyester between the first roller and the second roller; the length of the polyester between the first network nozzle and the tensioning guide is 1 / 60 - 1 / 30 of the length of the polyester between the first roller and the second roller.

[0014] A method for adding network to polyester with low tension as described above. The first network nozzle is Hebrin P213, with an aperture of 1.6 mm, an elliptical shape. The tension of polyester at the inlet is 4 - 5 cN (if there is no tensioning wire guide, it is 11 - 13 cN). The network air pressure of the first network nozzle is 1.1 - 1.3 bar (if there is no tensioning wire guide, it is 2.4 bar). The network density of polyester at the outlet is 45 - 50 per meter, and the network point fastness is of the light network level, that is, applying a force of 8 cN to tension and relax back and forth three times without network shedding, which can meet the production requirements.

[0015] A method for adding network to polyester with low tension as described above. The number of tensioning wire guides is two. The first roller, the first network nozzle, the first tensioning wire guide, and the second tensioning wire guide are arranged at intervals along the wire running direction. The friction coefficient of each tensioning wire guide is 0.2 - 0.7. The angle between the polyester and the horizontal line at the inlet and outlet of the first network nozzle is 30 - 90°. The wrap angle of the polyester when passing through the first tensioning wire guide is 90 - 150°. The wrap angle of the polyester when passing through the second tensioning wire guide is 90 - 150°. The wrap angle of the polyester when passing through the tensioning wire 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 the tension of the polyester can be reduced. When the number of tensioning wire guides is two, the effect of reducing the tension of the polyester can play an accumulative role.

[0016] A method for adding network to polyester with low tension as described above. The length of the polyester between the first roller and the first network nozzle is 1 / 24 - 1 / 12 of the length of the polyester between the first roller and the second roller. The length of the polyester between the first network nozzle and the first tensioning wire guide is 1 / 60 - 1 / 30 of the length of the polyester between the first roller and the second roller. The length of the polyester between the first tensioning wire guide and the second tensioning wire guide is 1 / 120 - 1 / 60 of the length of the polyester between the first roller and the second roller.

[0017] A method for adding network to polyester with low tension as described above. The first network nozzle is Hebrin P213, with an aperture of 1.6 mm, an elliptical shape. The tension of polyester at the inlet is 3 - 4 cN (if there is no tensioning wire guide, it is 11 - 13 cN). The network air pressure of the first network nozzle is 0.6 - 1.0 bar (if there is no tensioning wire guide, it is 2.4 bar). The network density of polyester at the outlet is 50 - 55 per meter, and the network point fastness is of the light network level, that is, applying a force of 8 cN to tension and relax back and forth three times without network shedding, which can meet the production requirements.

[0018] A method for adding network to polyester with low tension as described above, the number of tension guide wires is three, and the first roller, the first network nozzle, the first tension guide wire, the second tension guide wire, and the third tension guide wire are arranged at intervals along the wire feeding direction; the friction coefficient of each tension guide wire is 0.2 - 0.7; the angle between the polyester and the horizontal line at the inlet and outlet of the first network nozzle is 15 - 90°, the wrap angle of the polyester when passing through the first tension guide wire is 90 - 165°, the wrap angle of the polyester when passing through the second tension guide wire is 90 - 165°, the wrap angle of the polyester when passing through the third tension guide wire is 90 - 165°, and the wrap angle of the polyester when passing through the tension guide wire 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 the tension of the polyester can be reduced. When the number of tension guide wires is three, the effect of reducing the tension of the polyester can play an accumulative role.

[0019] A method for adding network to polyester with low tension as described above, the length of the polyester between the first roller and the first network nozzle is 1 / 24 - 1 / 12 of the length of the polyester between the first roller and the second roller; the length of the polyester between the first network nozzle and the first tension guide wire is 1 / 60 - 1 / 30 of the length of the polyester between the first roller and the second roller; the length of the polyester between the first tension guide wire and the second tension guide wire is 1 / 120 - 1 / 60 of the length of the polyester between the first roller and the second roller; the length of the polyester between the second tension guide wire and the third tension guide wire is 1 / 120 - 1 / 60 of the length of the polyester between the first roller and the second roller.

[0020] A method for adding network to polyester with low tension as described above, the first network nozzle is Hebrin P213, the aperture is 1.6 mm, the shape is oval, the tension of the polyester at the inlet is 1.5 - 3 cN (if there is no tension guide wire, it is 11 - 13 cN), the network air pressure of the first network nozzle is 0.4 - 0.6 bar (if there is no tension guide wire, it is 2.4 bar), the network degree of the polyester at the outlet is 55 - 60 per meter, and the network point fastness is light net level, that is, applying a force of 8 cN to tension and relax back and forth three times without de - networking, which can meet the production requirements.

[0021] A method for adding network to polyester with low tension as described above is not only limited to the production of polyester civil filament POY filament, FDY filament, and polyester DTY filament, between two rollers with a speed difference, but also applicable to the production of industrial filament and the doubling and twisting processing of industrial filament. In other fields of chemical fibers such as nylon, acrylic, spandex, and polypropylene, it is also applicable to the post - weaving field of chemical fibers.

[0022] A method for adding network to polyester with low tension as described above. According to different machine types and installation space positions, more tension guide wires can be installed between the two rollers to meet the special tension requirements when adding network by the first network nozzle.

[0023] Beneficial effects:

[0024] In the present invention, a tension guide wire and at least one network nozzle are installed between the first roller and the second roller. The friction force between the tension guide wire and the polyester is used to offset part of the drafting force received by the polyester. Thus, without changing the roller speed, the tension of the polyester between the two rollers is significantly reduced, and the pre-network effect is improved.

[0025] The method for adding network to polyester with low tension in the present invention has a simple implementation process, without the need to adjust the roller speed or add additional equipment, greatly improving the production efficiency and flexibility.

[0026] The method for adding network to polyester with low tension in the present invention has a wide application range and can be applied to various types of textile machinery. Description of the drawings

[0027] Figure 1 It is a schematic diagram for preparing polyester DTY yarn in Example A1 of the present invention;

[0028] Figure 2 It is a schematic diagram for force analysis of the filament;

[0029] Figure 3 It is a schematic structural diagram of the tension guide wire in Example A1 of the present invention; wherein, (a) is the front view, and (b) is the sectional view (along the A-A direction in (a));

[0030] Figure 4 It is a schematic diagram of the connection relationship among the tension guide wire, the fixed bracket, and the strip-shaped binding member when installing the tension guide wire in Example A1 of the present invention;

[0031] Figure 5 It is a schematic installation diagram of the tension guide wire in Example A1 of the present invention. In the figure, ∠1 is the angle between the polyester and the horizontal line at the inlet and outlet of the first network nozzle, and ∠2 is the wrap angle when the polyester POY yarn passes through the tension guide wire;

[0032] Among them, 1 - polyester POY yarn, 2 - polyester FDY yarn, 3 - the first roller, 4 - the first network nozzle, 5 - the tension guide, 7 - the first hot box, 8 - the cooling plate, 9 - the false twister, 10 - the tensiometer, 11 - the second roller, 12 - the second network nozzle, 13 - the auxiliary roller, 14 - the second hot box, 15 - the third roller, 16 - the oiling roller, 17 - the yarn bobbin, 18 - polyester DTY yarn, 19 - the fixed cross bar of the lifting screw rod, 20 - the second screw hole, 21 - the lifting screw rod, 23 - the leather roller, 25 - the pre-network compressed air pipe, 26 - the second screw, 31 - the first screw hole, 32 - the fixed bracket, 33 - the first screw, 34 - the strip-shaped combination part. Specific embodiments

[0033] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and 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.

[0034] The following are the test methods for relevant performance indicators in each embodiment and comparative example:

[0035] Network degree and network point fastness: Measured using a filament network degree instrument (manufactured by Changzhou Bafang Lishi Textile Instrument Co., Ltd., model BF1801); among them, the test length is 1 m, the test speed is 2.5 m / min, the release force is 0.3 cN / dtex, and the pre-tension is 0.1 cN / dtex.

[0036] Linear density, breaking strength, and breaking elongation: Measured with reference to the standard of GB / T14343 - 2008; among them, the test temperature is 25 °C, the test humidity is 65%, the pre-tension is 0.2 cN / dtex, the test speed is 500 mm / min, and the clamping length is 500 mm.

[0037] Crimp shrinkage rate: Measured with reference to the standard of GB / T6506 - 2017; among them, the test temperature is 25 °C and the test humidity is 65%.

[0038] Boiling water shrinkage rate: Measured with reference to the standard of GB / T6505 - 2017; among them, the test temperature is 25 °C, the test humidity is 65%, and the loading tension is 0.2 cN / dtex.

[0039] Example A1

[0040] A method for preparing polyester DTY yarn, as Figure 1As shown in the figure, polyester POY yarn 1 (with a specification of 350 dtex / 96 f) is fed into the second network nozzle 12 successively through the first roller 3, the first network nozzle 4, the tension guide 5, the first hot box 7, the cooling plate 8, the false twister 9, the tension meter 10, and the second roller 11. At the same time, polyester FDY yarn 2 (with a specification of 110 dtex / 36 f) is fed into the second network nozzle 12 successively through the first roller 3, the tension meter 10, and the second roller 11. Then, the polyester POY yarn 1 and the polyester FDY yarn 2 are wound around the bobbin 17 successively through the auxiliary roller 13, the second hot box 14, the third roller 15, and the oiling wheel 16 to obtain polyester DTY yarn 18;

[0041] As Figure 5 shown, a top roller 23 is arranged above the first roller 3; the first network nozzle 4 is Heublin P213 with a pore diameter of 1.6 mm and an elliptical shape, and the first network nozzle 4 is connected to the pre-network compressed air pipe 25; the tension guide 5 is a concave-opening titanium oxide tension guide, and its structure is as Figure 3 shown, the friction coefficient of the tension guide 5 is 0.2; as Figure 4 shown, the tension guide 5 is installed on the fixed bracket 32, and the fixed bracket 32 is fixed on the strip-shaped bonding member 34 through the cooperation of the first screw 33 and the first screw hole 31; as Figure 5 shown, both ends of the strip-shaped bonding member 34 are connected to one lifting screw fixed cross bar 19 through the second screw 26 and the second screw hole 20, the position of the strip-shaped bonding member 34 along the length direction of the lifting screw fixed cross bar 19 is adjustable, and one end of the lifting screw fixed cross bar 19 is connected to the lifting screw 21, and the lifting screw 21 is used to send the polyester POY yarn passing through the tension guide 5 to the inlet of the first hot box 7;

[0042] Among them, the included angle ∠1 between the polyester POY yarn and the horizontal line of the inlet and outlet of the first network nozzle 4 is 45°; the wrap angle ∠2 of the polyester POY yarn passing through the tension guide 5 is 135°; the rotation speed ratio of the first roller 3 and the second roller 11 is 1.5, and the length of the polyester between the first roller 3 and the second roller 11 is 6 m; the length of the polyester between the first roller 3 and the first network nozzle 4 is 0.25 m; the length of the polyester between the first network nozzle 4 and the tension guide 5 is 0.1 m;

[0043] Other process parameters are: the network air pressure of the first network nozzle 4 is 1.3 bar, the vehicle speed is 600 m / min, the temperature of the first hot box 7 is 183 °C, the temperature of the second hot box 14 is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle 12 is 2.8 bar.

[0044] The test shows that the tension of the polyester POY yarn 1 at the inlet of the first network nozzle 4 is 5.0 cN; the degree of entanglement of the polyester POY yarn 1 at the outlet of the first network nozzle 4 is 45 per meter, and the fastness of the entanglement points is at the light-net level; the linear density of the finally produced polyester DTY yarn is 326.08 dtex, the breaking strength is 3.14 cN / dtex, the breaking elongation is 30.37%, the degree of entanglement is 88 per meter, the crimp shrinkage rate is 5.42%, and the boiling water shrinkage rate is 7.71%.

[0045] Comparative Example 1

[0046] A method for preparing a polyester DTY yarn is basically the same as that of Example A1, except that: there is no tension guide wire between the first network nozzle and the first hot box; the network air pressure of the first network nozzle is 2.4 bar.

[0047] The test shows that the tension of the polyester POY yarn at the inlet of the first network nozzle is 13 cN; the degree of entanglement of the polyester POY yarn at the outlet of the first network nozzle is 8 per meter, and the fastness of the entanglement points is at the non-net level.

[0048] Compared with Example A1, in Comparative Example 1, 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 increase significantly, while the degree of entanglement and the fastness of the entanglement points of the polyester POY yarn at the outlet of the first network nozzle decrease significantly. This is because there is no tension guide wire installed between the first roller and the second roller in Comparative Example 1, resulting in that when the polyester POY yarn passes through the first network nozzle, the frictional force between the tension guide wire and the polyester cannot be used to offset part of the drafting force, so the tension of the polyester POY yarn between the first roller and the second roller cannot be effectively reduced, affecting the pre-network effect.

[0049] Example A2

[0050] A method for preparing a polyester DTY yarn is basically the same as that of Example A1, except that: the material of the tension guide wire is alumina, and the friction coefficient is 0.15.

[0051] The test shows that the tension of the polyester POY yarn at the inlet of the first network nozzle is 10 cN; the degree of entanglement of the polyester POY yarn at the outlet of the first network nozzle is 30 per meter, and the fastness of the entanglement points is at the light-net level.

[0052] Compared with Example A1, the pre-network effect of Example A2 is slightly worse. This is because the friction coefficient of the tension guide wire made of alumina is small, the frictional resistance applied to the polyester POY yarn is small, and the effect of reducing the tension of the polyester POY yarn is weak.

[0053] Example A3

[0054] A method for preparing polyester DTY yarn, which is basically the same as that of Example A1, except that: the angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 10°.

[0055] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 5 cN; the degree of network of the polyester POY yarn at the outlet of the first network nozzle is 38 per meter, and the fastness of the network points is at the light network level.

[0056] Example A4

[0057] A method for preparing polyester DTY yarn, which is basically the same as that of Example A1, except that: the angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 135°.

[0058] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 3.5 cN; the degree of network of the polyester POY yarn at the outlet of the first network nozzle is 42 per meter, and the fastness of the network points is at the light network level.

[0059] Example A5

[0060] A method for preparing polyester DTY yarn, feeding the polyester POY yarn (specification: 350 dtex / 96 f) into the second network nozzle through the first roller, the first network nozzle, the tensioning guide wire device, the first hot box, the cooling plate, the false twister, the tension meter, and the second roller in sequence. At the same time, feeding the polyester FDY yarn (specification: 110 dtex / 36 f) into the second network nozzle through the first roller, the tension meter, and the second roller in sequence. Then winding the polyester POY yarn and the polyester FDY yarn around the bobbin through the auxiliary roller, the second hot box, the third roller, and the oiling wheel to obtain the polyester DTY yarn;

[0061] Among them, the first network nozzle is Heublin P213, with a pore diameter of 1.6 mm and an elliptical shape; the tensioning guide wire device is a concave-opening titanium oxide tensioning guide wire device, and the friction coefficient of the tensioning guide wire device is 0.4; the angle between the polyester POY yarn and the horizontal line at 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 wire device is 120°; the ratio of the rotational speeds of the first roller and the second roller is 1.72, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.35 m; the length of the polyester between the first network nozzle and the tensioning guide wire device is 0.15 m;

[0062] Other process parameters are: the network air pressure of the first network nozzle is 1.2 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0063] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 4.5 cN; the degree of entanglement of the polyester POY yarn at the outlet of the first network nozzle is 48 per meter, and the fastness of the entanglement points is of the light network level; the linear density of the finally obtained polyester DTY yarn is 326 dtex, the breaking strength is 3.05 cN / dtex, the breaking elongation is 30.02%, the degree of entanglement is 84 per meter, the crimp shrinkage rate is 5.44%, and the boiling water shrinkage rate is 7.55%.

[0064] Example A6

[0065] A method for preparing polyester DTY yarn, in which polyester POY yarn (specification: 350 dtex / 96 f) is fed into the second network nozzle through the first roller, the first network nozzle, the tension guide, the first hot box, the cooling plate, the false twister, the tensiometer, and the second roller in sequence. At the same time, polyester FDY yarn (specification: 110 dtex / 36 f) is fed into the second network nozzle through the first roller, the tensiometer, and the second roller in sequence. Then, the polyester POY yarn and the polyester FDY yarn are wound around the bobbin through the auxiliary roller, the second hot box, the third roller, and the oiling wheel to obtain polyester DTY yarn;

[0066] Among them, the first network nozzle is Hebrin P213, the aperture is 1.6 mm, and the shape is oval; the tension guide is a concave-opening titanium oxide tension guide, and the friction coefficient of the tension guide is 0.7; the angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 90°; the wrap angle of the polyester POY yarn when passing through the tension guide is 90°; the ratio of the rotational speeds of the first roller and the second roller is 1.85, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.5 m; the length of the polyester between the first network nozzle and the tension guide is 0.2 m;

[0067] Other process parameters are: the network air pressure of the first network nozzle is 1.1 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0068] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 4.0 cN; the degree of entanglement of the polyester POY yarn at the outlet of the first network nozzle is 50 per meter, and the fastness of the entanglement points is of the light network level; the linear density of the finally obtained polyester DTY yarn is 327.63 dtex, the breaking strength is 3.01 cN / dtex, the breaking elongation is 29.13%, the degree of entanglement is 83 per meter, the crimp shrinkage rate is 5.35%, and the boiling water shrinkage rate is 7.77%.

[0069] Example B1

[0070] A method for preparing polyester DTY yarn, wherein the polyester POY yarn (with a specification of 350 dtex / 96 f) is successively fed into the second network nozzle through the first roller, the first network nozzle, the first tension guide, the second tension guide, the first hot box, the cooling plate, the false twister, the tension meter, and the second roller. At the same time, the polyester FDY yarn (with a specification of 110 dtex / 36 f) is successively fed into the second network nozzle through the first roller, the tension meter, and the second roller. Then, the polyester POY yarn and the polyester FDY yarn are successively wound around the bobbin through the auxiliary roller, the second hot box, the third roller, and the oiling wheel to obtain the polyester DTY yarn;

[0071] Among them, the first network nozzle is Heublin P213, with an aperture of 1.6 mm and an elliptical shape; both the first tension guide and the second tension guide are concave-opening titanium oxide tension guides, and the friction coefficients of the first tension guide and the second tension guide are both 0.2; the included angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 30°; the wrap angles of the polyester POY yarn passing through the first tension guide and the second tension guide are both 150°; the ratio of the rotational speeds of the first roller and the second roller is 1.5, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.25 m; the length of the polyester between the first network nozzle and the first tension guide is 0.1 m; the length of the polyester between the first tension guide and the second tension guide is 0.05 m;

[0072] Other process parameters are: the network air pressure of the first network nozzle is 1.0 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0073] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 4.0 cN; the network degree of the polyester POY yarn at the outlet of the first network nozzle is 50 pieces / m, and the network point fastness is of the light network level; the linear density of the finally prepared polyester DTY yarn is 326.08 dtex, the breaking strength is 3.14 cN / dtex, the breaking elongation rate is 30.37%, the network degree is 88 pieces / m, the crimp shrinkage rate is 5.42%, and the boiling water shrinkage rate is 7.71%.

[0074] Example B2

[0075] A method for preparing polyester DTY yarn, in which polyester POY yarn (with a specification of 350 dtex / 96 f) is fed into a second-stage network nozzle through a first roller, a first-stage network nozzle, a first-stage tensioning wire guide, a second-stage tensioning wire guide, a first hot box, a cooling plate, a false twister, a tensiometer, and a second roller in sequence. At the same time, polyester FDY yarn (with a specification of 110 dtex / 36 f) is fed into the second-stage network nozzle through the first roller, the tensiometer, and the second roller in sequence. Then, the polyester POY yarn and the polyester FDY yarn are wound around a bobbin through an auxiliary roller, a second hot box, a third roller, and an oiling roller to obtain polyester DTY yarn;

[0076] Among them, the first-stage network nozzle is Hebrin P213, with an aperture of 1.6 mm and an elliptical shape; both the first-stage tensioning wire guide and the second-stage tensioning wire guide are concave-opening titanium oxide tensioning wire guides, and the friction coefficients of the first-stage tensioning wire guide and the second-stage tensioning wire guide are both 0.4; the included angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first-stage network nozzle is 60°; the wrap angles of the polyester POY yarn when passing through the first-stage tensioning wire guide and the second-stage tensioning wire guide are both 120°; the ratio of the rotational speeds of the first roller and the second roller is 1.72, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first-stage network nozzle is 0.35 m; the length of the polyester between the first-stage network nozzle and the first-stage tensioning wire guide is 0.15 m; the length of the polyester between the first-stage tensioning wire guide and the second-stage tensioning wire guide is 0.07 m;

[0077] Other process parameters are as follows: the network air pressure of the first-stage network nozzle is 0.8 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second-stage network nozzle is 2.8 bar.

[0078] Tests show that the tension of the polyester POY yarn at the inlet of the first-stage network nozzle is 3.5 cN; the network degree of the polyester POY yarn at the outlet of the first-stage network nozzle is 52 per meter, and the network point fastness is of the light network level; the linear density of the finally prepared polyester DTY yarn is 326 dtex, the breaking strength is 3.05 cN / dtex, the breaking elongation rate is 30.02%, the network degree is 84 per meter, the crimp shrinkage rate is 5.44%, and the boiling water shrinkage rate is 7.55%.

[0079] Example B3

[0080] A method for preparing polyester DTY yarn, in which polyester POY yarn (specification: 350 dtex / 96 f) is successively fed into a second network nozzle through a first roller, a first network nozzle, a first tension guide, a second tension guide, a first hot box, a cooling plate, a false twister, a tension meter, and a second roller. At the same time, polyester FDY yarn (specification: 110 dtex / 36 f) is successively fed into the second network nozzle through the first roller, the tension meter, and the second roller. Then, the polyester POY yarn and the polyester FDY yarn are successively wound around a bobbin through an auxiliary roller, a second hot box, a third roller, and an oiling wheel to obtain polyester DTY yarn;

[0081] Among them, the first network nozzle is Hebrin P213, with an aperture of 1.6 mm and an elliptical shape; both the first tension guide and the second tension guide are concave-opening titanium oxide tension guides, and the friction coefficients of both the first tension guide and the second tension guide are 0.7; the angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 90°; the wrap angles of both the first tension guide and the second tension guide are 90°; the ratio of the rotational speeds of the first roller and the second roller is 1.85, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.5 m; the length of the polyester between the first network nozzle and the first tension guide is 0.2 m; the length of the polyester between the first tension guide and the second tension guide is 0.1 m;

[0082] Other process parameters are: the network air pressure of the first network nozzle is 0.6 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0083] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 3.0 cN; the network degree of the polyester POY yarn at the outlet of the first network nozzle is 55 per m, and the network point fastness is of the light network level; the linear density of the finally prepared polyester DTY yarn is 327.63 dtex, the breaking strength is 3.01 cN / dtex, the breaking elongation rate is 29.13%, the network degree is 83 per m, the crimp shrinkage rate is 5.35%, and the boiling water shrinkage rate is 7.77%.

[0084] Example C1

[0085] A method for preparing polyester DTY yarn, in which polyester POY yarn (specification: 350 dtex / 96 f) is successively fed into a second network nozzle through a first roller, a first network nozzle, a first tensioning wire guide, a second tensioning wire guide, a third tensioning wire guide, a first hot box, a cooling plate, a false twister, a tension meter, and a second roller. At the same time, polyester FDY yarn (specification: 110 dtex / 36 f) is successively fed into the second network nozzle through the first roller, the tension meter, and the second roller. Then, the polyester POY yarn and the polyester FDY yarn are successively wound around a bobbin through an auxiliary roller, a second hot box, a third roller, and an oiling wheel to obtain polyester DTY yarn;

[0086] Among them, the first network nozzle is Hebrin P213, with a pore diameter of 1.6 mm and an elliptical shape; the first tensioning wire guide, the second tensioning wire guide, and the third tensioning wire guide are all concave-opening titanium oxide tensioning wire guides, and the friction coefficients of the first tensioning wire guide, the second tensioning wire guide, and the third tensioning wire guide are all 0.2; the included angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 15°; the wrap angles of the polyester POY yarn when passing through the first tensioning wire guide, the second tensioning wire guide, and the third tensioning wire guide are all 165°; the ratio of the rotational speeds of the first roller and the second roller is 1.5, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.25 m; the length of the polyester between the first network nozzle and the first tensioning wire guide is 0.1 m; the lengths of the polyester between the first tensioning wire guide and the second tensioning wire guide, and between the second tensioning wire guide and the third tensioning wire guide are both 0.05 m;

[0087] Other process parameters are as follows: the network air pressure of the first network nozzle is 0.6 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0088] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 3.0 cN; the network degree of the polyester POY yarn at the outlet of the first network nozzle is 55 per m, and the network point fastness is of the light network level; the linear density of the finally prepared polyester DTY yarn is 326.08 dtex, the breaking strength is 3.14 cN / dtex, the breaking elongation rate is 30.37%, the network degree is 88 per m, the crimp shrinkage rate is 5.42%, and the boiling water shrinkage rate is 7.71%.

[0089] Example C2

[0090] A method for preparing polyester DTY yarn, wherein the polyester POY yarn (with a specification of 350 dtex / 96 f) is successively fed into the second network nozzle through the first roller, the first network nozzle, the first tension guide, the second tension guide, the third tension guide, the first hot box, the cooling plate, the false twister, the tension meter, and the second roller. At the same time, the polyester FDY yarn (with a specification of 110 dtex / 36 f) is successively fed into the second network nozzle through the first roller, the tension meter, and the second roller. Then, the polyester POY yarn and the polyester FDY yarn are successively wound around the bobbin through the auxiliary roller, the second hot box, the third roller, and the oiling wheel to obtain the polyester DTY yarn;

[0091] Among them, the first network nozzle is Hebrin P213, with an aperture of 1.6 mm and an elliptical shape; the first tension guide, the second tension guide, and the third tension guide are all concave-opening titanium oxide tension guides, and the friction coefficients of the first tension guide, the second tension guide, and the third tension guide are all 0.4; the included angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 50°; the wrap angles of the polyester POY yarn when passing through the first tension guide, the second tension guide, and the third tension guide are all 130°; the ratio of the rotational speeds of the first roller and the second roller is 1.72, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.35 m; the length of the polyester between the first network nozzle and the first tension guide is 0.15 m; the lengths of the polyester between the first tension guide and the second tension guide, and between the second tension guide and the third tension guide are both 0.07 m;

[0092] Other process parameters are as follows: the network air pressure of the first network nozzle is 0.5 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0093] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 2.5 cN; the network degree of the polyester POY yarn at the outlet of the first network nozzle is 57 per m, and the network point fastness is at the light network level; the linear density of the finally prepared polyester DTY yarn is 326 dtex, the breaking strength is 3.05 cN / dtex, the breaking elongation rate is 30.02%, the network degree is 84 per m, the crimp shrinkage rate is 5.44%, and the boiling water shrinkage rate is 7.55%.

[0094] Example C3

[0095] A method for preparing polyester DTY yarn, wherein the polyester POY yarn (specification: 350 dtex / 96 f) is successively fed into the second network nozzle through the first roller, the first network nozzle, the first tension guide, the second tension guide, the third tension guide, the first hot box, the cooling plate, the false twister, the tension meter, and the second roller. Meanwhile, the polyester FDY yarn (specification: 110 dtex / 36 f) is successively fed into the second network nozzle through the first roller, the tension meter, and the second roller. Then, the polyester POY yarn and the polyester FDY yarn are successively wound around the bobbin through the auxiliary roller, the second hot box, the third roller, and the oiling wheel to obtain the polyester DTY yarn;

[0096] Among them, the first network nozzle is Hebrin P213, with a pore diameter of 1.6 mm and an elliptical shape; the first tension guide, the second tension guide, and the third tension guide are all concave-opening titanium oxide tension guides, and the friction coefficients of the first tension guide, the second tension guide, and the third tension guide are all 0.7; the included angle between the polyester POY yarn and the horizontal line at the inlet and outlet of the first network nozzle is 90°; the wrap angles of the polyester POY yarn passing through the first tension guide, the second tension guide, and the third tension guide are all 90°; the ratio of the rotational speeds of the first roller and the second roller is 1.85, and the length of the polyester between the first roller and the second roller is 6 m; the length of the polyester between the first roller and the first network nozzle is 0.5 m; the length of the polyester between the first network nozzle and the first tension guide is 0.2 m; the lengths of the polyester between the first tension guide and the second tension guide and between the second tension guide and the third tension guide are both 0.1 m;

[0097] Other process parameters are as follows: the network air pressure of the first network nozzle is 0.4 bar, the vehicle speed is 600 m / min, the temperature of the first hot box is 183 °C, the temperature of the second hot box is 156 °C, the network overfeed is 3.9%, the setting overfeed is 0.9%, the winding overfeed is 0.25%, and the network air pressure of the second network nozzle is 2.8 bar.

[0098] Tests show that the tension of the polyester POY yarn at the inlet of the first network nozzle is 1.5 cN; the network degree of the polyester POY yarn at the outlet of the first network nozzle is 60 per m, and the network point fastness is at the light network level; the linear density of the finally prepared polyester DTY yarn is 327.63 dtex, the breaking strength is 3.01 cN / dtex, the breaking elongation rate is 29.13%, the number of network points is 83 per m, the crimp shrinkage rate is 5.35%, and the boiling water shrinkage rate is 7.77%.

Claims

1. A method for low-tension interlacing of polyester, characterized in that: A first interlacing nozzle and at least one tensioning wire guide are installed between the first roller and the second roller, and the friction between the tensioning wire guide and the polyester is used to offset part of the drafting force on the polyester, thereby reducing the tension of the polyester between the first roller and the second roller when the first interlacing nozzle is interlaced; The first roller and the first network nozzle are arranged in sequence along the wire running direction, and each tensioning wire guide is located between the first network nozzle and the second roller.

2. A polyester low tension interlacing method according to claim 1, characterized in that: The ratio of the rotation speeds of the first roller and the second roller is 1.5-1.85, and the linear density of polyester is 350 dtex.

3. A polyester low tension interlacing method according to claim 2, characterized in that: The tensioning wire guide is a concave opening titanium oxide tensioning wire guide.

4. A polyester low tension interlacing method according to claim 3, characterized in that: The length of polyester between the first roller and the second roller is 6m.

5. A polyester low tension interlacing method according to claim 4, characterized in that: The number of tensioning wire guides is one; the friction coefficient of the tensioning wire 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 45-90 degrees, and the wrap angle of the polyester when passing through the tensioning wire guide is 90-135 degrees.

6. A polyester low tension interlacing method according to claim 5, characterized in that: The length of the polyester between the first roller and the first network nozzle is 1 / 24-1 / 12 of the length of the polyester between the first roller and the second roller; the length of the polyester between the first network nozzle and the tensioning guide is 1 / 60-1 / 30 of the length of the polyester between the first roller and the second roller.

7. A polyester low tension interlacing method according to claim 6, characterized in that: The aperture of the first network nozzle is 1.6mm, the shape is elliptical, the tension of the polyester at the entrance is 4-5cN, the network air pressure of the first network nozzle is 1.1-1.3bar, the network density of the polyester at the exit is 45-50 / m, and the network point fastness is light mesh grade.

8. The method for low-tension interlacing of polyester according to claim 4, characterized in that: There are two tensioning guides; 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°, and the wrap angle of the polyester when passing through the second tensioning guide is 90-150°.

9. A polyester low tension interlacing method according to claim 8, characterized in that: The length of polyester between the first roller and the first network nozzle is 1 / 24-1 / 12 of the length of polyester between the first roller and the second roller; the length of polyester between the first network nozzle and the first tensioning wire guide is 1 / 60-1 / 30 of the length of polyester between the first roller and the second roller; the length of polyester between the first tensioning wire guide and the second tensioning wire guide is 1 / 120-1 / 60 of the length of polyester between the first roller and the second roller.

10. A polyester low tension interlacing method according to claim 9, characterized in that: The aperture of the first network nozzle is 1.6mm, the shape is elliptical, the tension of the polyester at the entrance is 3-4cN, the network air pressure of the first network nozzle is 0.6-1.0bar, the network density of the polyester at the exit is 50-55 / m, and the network point fastness is light mesh grade.

11. The method for low-tension interlacing of polyester 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 low-tension interlacing of polyester according to claim 11, characterized in that: The length of polyester between the first roller and the first network nozzle is 1 / 24-1 / 12 of the length of polyester between the first roller and the second roller; the length of polyester between the first network nozzle and the first tensioning wire guide is 1 / 60-1 / 30 of the length of polyester between the first roller and the second roller; the length of polyester between the first tensioning wire guide and the second tensioning wire guide is 1 / 120-1 / 60 of the length of polyester between the first roller and the second roller; the length of polyester between the second tensioning wire guide and the third tensioning wire guide is 1 / 120-1 / 60 of the length of polyester between the first roller and the second roller.

13. A polyester low tension interlacing method according to claim 12, characterized in that: The aperture of the first network nozzle is 1.6mm, the shape is elliptical, the tension of the polyester at the entrance is 1.5-3cN, the network air pressure of the first network nozzle is 0.4-0.6bar, the network density of the polyester at the exit is 55-60 / m, and the network point fastness is light mesh grade.

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