Polyester low-tension interlacing method

Abstract

The invention belongs to the technical field of fiber production, and relates to a low-tension interlacing method for terylene, which comprises the following steps of: arranging a first interlacing nozzle and at least one tensioning yarn guide between a first roller and a second roller, and counteracting part of drafting force borne by the terylene by utilizing friction force between the tensioning yarn guide and the terylene; therefore, the tension of polyester between the first roller and the second roller is reduced when the first interlacing nozzle is used for interlacing. According to the low-tension interlacing method for the polyester, the tension of the polyester between the two rollers is obviously reduced under the condition that the speed of the rollers is not changed, so that the pre-interlacing effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber production and relates to a polyester low-tension interlacing method. Background Art

[0002] Polyester stretch textured yarn (DTY yarn for short) is a high-performance fiber widely used in the textile industry. By adding a network during its production process, the yarn bundling can be significantly improved, which is convenient for subsequent weaving operations and gives the fabric a variety of styles. The heavy network yarn in the network yarn also has the advantage of eliminating the sizing process in the subsequent weaving process. Therefore, the production of polyester DTY yarn generally chooses to add a network to enhance product performance.

[0003] The network processing of polyester DTY yarn is usually divided into two stages: pre-network and mid-network. Pre-network is usually carried out before the stretching and false twisting process, and the network nozzle is generally set between the outlet of the wire guide tube of the texturing machine and the first roller. However, due to the speed difference between the first roller and the second roller (i.e., the draft ratio), it is easy to form a large tension, which will have an adverse effect on the pre-network effect. In order to improve the pre-network effect, some products will add a zero roller, and at the same time, the network nozzle is set between the zero roller and the first roller, so as to ensure that the silk strip is in a more stable state when forming a network structure. This is because after the silk strip passes through the zero roller, its tension, speed and position are better controlled and adjusted, which is conducive to the network nozzle to spray airflow more accurately and form uniform and stable network points. However, in some specific models such as the TMT manufacturer ATF-1500FDOUR texturing machine, due to space limitations, it becomes impractical to add a zero roller, which makes its application have certain limitations.

[0004] Therefore, it is necessary to propose a method for achieving better pre-networking effect without adding zero rollers. Summary of the invention

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

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

[0007] A method for adding low-tension interlacing to polyester, wherein a first interlacing nozzle and at least one tensioning wire guide are installed between a first roller and a 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 adding interlacing; Figure 2As shown, the stretching force on the polyester between the first roller and the second roller is recorded as F stretching force, the force on the contact between the yarn and the surface of the tensioning guide is recorded as Fn supporting force, the friction force between the tensioning guide and the polyester is recorded as F friction force, and F friction force can be decomposed into F1 and F2. The direction of F1 is opposite to that of 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 large. When there is a tensioning guide, F1>0, and the tension of the polyester between the first roller and the second roller is small.

[0008] As the preferred technical solution:

[0009] In the method for adding low-tension network to polyester 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 wire 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 0.25N, which is relatively high and difficult to add network.

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

[0011] In the polyester low-tension interlacing method as described above, the length of the polyester between the first roller and the second roller is 6 m.

[0012] In the method for adding low-tension network to polyester as described above, the number of tensioning wire guides is one, the first roller, the first network nozzle, and the tensioning wire guide are arranged at intervals along the wire running direction; 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°, and the wrap angle of the polyester when passing through the tensioning wire guide is 90-135°. 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 friction resistance, and the more the tension of the polyester can be reduced.

[0013] In the method for low-tension interlacing of polyester as described above, the length of polyester between the first roller and the first interlacing 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 interlacing nozzle and the tensioning wire guide is 1 / 60-1 / 30 of the length of polyester between the first roller and the second roller.

[0014] As described above, a method for adding low-tension networking to polyester is described, in which the first networking nozzle is Heibolin P213, with an aperture of 1.6mm and an elliptical shape. The tension of the polyester at the entrance is 4-5cN (11-13cN if there is no tensioning wire guide), the network air pressure of the first networking nozzle is 1.1-1.3bar (2.4bar if there is no tensioning wire guide), the network density of the polyester at the exit is 45-50 pcs / m, and the network point firmness is of light mesh grade, that is, a force of 8cN is applied to tension and relax back and forth three times without de-networking, which can meet production needs.

[0015] In the method for adding low tension to the network of polyester 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 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 wire guide is 90-150°, and 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 friction 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 a cumulative role.

[0016] In the method for low-tension interlacing of polyester as described above, the length of polyester between the first roller and the first interlacing 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 interlacing nozzle and the first tensioning 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 guide and the second tensioning guide is 1 / 120-1 / 60 of the length of polyester between the first roller and the second roller.

[0017] As described above, a method for adding low-tension networking to polyester is described, in which the first networking nozzle is Heberling P213, with an aperture of 1.6mm and an elliptical shape. The tension of the polyester at the entrance is 3-4cN (11-13cN if there is no tensioning wire guide), the network air pressure of the first networking nozzle is 0.6-1.0bar (2.4bar if there is no tensioning wire guide), the network density of the polyester at the exit is 50-55 pcs / m, and the network point firmness is of light mesh grade, that is, a force of 8cN is applied to tension and relax back and forth three times without de-networking, which can meet production needs.

[0018] In the method for adding low tension to the network of polyester as described above, the number of tensioning wire guides is three, the first roller, the first network nozzle, the first tensioning wire guide, the second tensioning wire guide, and the third 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 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 wire guide is 90-165°, the wrap angle of the polyester when passing through the second tensioning wire guide is 90-165°, and the wrap angle of the polyester when passing through the third tensioning wire guide is 90-165°. 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 friction resistance, and the more the tension of the polyester can be reduced. When the number of tensioning wire guides is three, the effect of reducing the tension of the polyester can play a cumulative role.

[0019] In the method for low-tension interlacing of polyester as described above, the length of polyester between the first roller and the first interlacing 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 interlacing nozzle and the first tensioning 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 guide and the second tensioning 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 guide and the third tensioning guide is 1 / 120-1 / 60 of the length of polyester between the first roller and the second roller.

[0020] As described above, a method for adding low-tension networking to polyester is used, wherein the first networking nozzle is Heberling P213, with an aperture of 1.6mm and an elliptical shape, the tension of the polyester at the entrance is 1.5-3cN (11-13cN if there is no tensioning wire guide), the network air pressure of the first networking nozzle is 0.4-0.6bar (2.4bar if there is no tensioning wire guide), the network density of the polyester at the exit is 55-60 pcs / m, and the network point firmness is of light mesh grade, that is, a force of 8cN is applied to tension and relax back and forth three times without de-networking, which can meet production needs.

[0021] The polyester low-tension network adding method described above is not limited to the two rollers with speed difference in the production of polyester civilian filament POY yarn, FDY yarn and polyester DTY yarn, but is also applicable to the production of industrial filament and the double twisting and twisting of industrial yarn. It is also applicable to the fields of other chemical fiber such as nylon, acrylic, spandex and polypropylene, and the subsequent weaving of chemical fiber.

[0022] In the polyester low-tension interlacing method described above, more tensioning guides may be installed between the two rollers, depending on the machine model and the installation space position, to achieve the special tension requirement when the first interlacing nozzle is interlaced.

[0023] Beneficial effects:

[0024] The present invention installs a tensioning wire guide and at least one network nozzle between the first roller and the second roller, and utilizes the friction between the tensioning wire guide and the polyester to offset part of the stretching force on the polyester, thereby significantly reducing the tension of the polyester between the two rollers without changing the roller speed, thereby improving the pre-networking effect.

[0025] The polyester low-tension interlacing method of the present invention has a simple implementation process, does not require adjusting roller speeds or adding additional equipment, and greatly improves production efficiency and flexibility.

[0026] The polyester low-tension interlacing method of the present invention has a wide range of applications and can be applied to various types of textile machinery. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 It is the schematic diagram of the force analysis of the wire strip;

[0029] Figure 3 Schematic diagram of the structure of the tensioning wire guide of Example A1 of the present invention; wherein (a) is a main view, and (b) is a cross-sectional view (along the AA direction in (a));

[0030] Figure 4 This is a schematic diagram of the connection relationship between the tensioning wire guide, the fixing bracket, and the strip-shaped coupling member when the tensioning wire guide is installed in Embodiment A1 of the present invention;

[0031] Figure 5 Schematic diagram of the installation of the tensioning yarn guide of Example A1 of the present invention, in which ∠1 is the angle between the polyester and the horizontal line of the inlet and outlet of the first network nozzle, and ∠2 is the wrap angle of the polyester POY yarn when passing through the tensioning yarn guide;

[0032] Among them, 1-polyester POY yarn, 2-polyester FDY yarn, 3-first roller, 4-first network nozzle, 5-tensioning wire guide, 7-first heat box, 8-cooling plate, 9-false twister, 10-tension meter, 11-second roller, 12-second network nozzle, 13-auxiliary roller, 14-second heat box, 15-third roller, 16-oiling wheel, 17-wire drum, 18-polyester DTY yarn, 19-lifting screw fixed cross bar, 20-second screw hole, 21-lifting screw, 23-leather roller, 25-pre-network compressed air pipe, 26-second screw, 31-first screw hole, 32-fixed bracket, 33-first screw, 34-strip combination. DETAILED DESCRIPTION

[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 are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

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

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

[0036] Linear density, breaking strength and breaking elongation: measured in accordance with GB / T14343-2008 standard; wherein, 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] Curl shrinkage rate: measured in accordance with GB / T6506-2017 standard; the test temperature is 25°C and the test humidity is 65%.

[0038] Boiling water shrinkage: measured in accordance with GB / T6505-2017 standard; the test temperature is 25°C, the test humidity is 65%, and the loading tension is 0.2cN / dtex.

[0039] Example A1

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

[0041] like Figure 5 As shown, a leather roller 23 is arranged above the first roller 3; the first network nozzle 4 is a Hybring P213, with an aperture 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 tensioning wire guide 5 is a concave opening titanium oxide tensioning wire guide, and its structure is as shown in FIG. Figure 3 As shown, the friction coefficient of the tensioning wire guide 5 is 0.2; Figure 4 As shown, the tensioning wire guide 5 is installed on the fixing bracket 32, and the fixing bracket 32 ​​is fixed on the strip-shaped binding member 34 through the cooperation of the first screw 33 and the first screw hole 31; Figure 5 As shown, both ends of the strip-shaped binding member 34 are connected to a lifting rod fixed cross bar 19 through a second screw 26 and a second screw hole 20, and the position of the strip-shaped binding member 34 along the length direction of the lifting rod fixed cross bar 19 is adjustable. One end of the lifting rod fixed cross bar 19 is connected to the lifting rod 21, and the lifting rod 21 is used to deliver the polyester POY yarn passing through the tensioning yarn guide 5 to the entrance of the first hot box 7;

[0042] Among them, the 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 when passing through the tensioning wire guide 5 is 135°; the ratio of the rotation speed 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 6m; the length of the polyester between the first roller 3 and the first network nozzle 4 is 0.25m; the length of the polyester between the first network nozzle 4 and the tensioning wire guide 5 is 0.1m;

[0043] Other process parameters are: network air pressure of the first network nozzle 4 is 1.3 bar, vehicle speed is 600 m / min, temperature of the first hot box 7 is 183°C, temperature of the second hot box 14 is 156°C, network overfeed is 3.9%, shaping overfeed is 0.9%, winding overfeed is 0.25%, and 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 network density of the polyester POY yarn 1 at the outlet of the first network nozzle 4 is 45 pieces / m, and the network point fastness is light mesh grade; the linear density of the polyester DTY yarn finally obtained is 326.08 dtex, the breaking strength is 3.14 cN / dtex, the breaking elongation is 30.37%, the network density is 88 pieces / m, the curling shrinkage is 5.42%, and the boiling water shrinkage is 7.71%.

[0045] Comparative Example 1

[0046] A method for preparing polyester DTY yarn is basically the same as that of Example A1, except that: there is no tensioning yarn guide between the first network nozzle and the first heat box; and 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 13cN; the network density of the polyester POY yarn at the outlet of the first network nozzle is 8 / m, and the network point fastness is at the no-network level.

[0048] Compared with 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, and the network degree 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 does not install a tensioning wire guide between the first roller and the second roller, resulting in the polyester POY yarn being unable to use the friction between the tensioning wire guide and the polyester to offset part of the drawing force when passing through the first network nozzle, so that 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 polyester DTY yarn is basically the same as that of Example A1, except that the tensioning yarn guide is made of aluminum oxide and has a friction coefficient of 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 network density of the polyester POY yarn at the outlet of the first network nozzle is 30 / m, and the network point fastness is light mesh grade.

[0052] Compared with Example A1, Example A2 has a slightly worse pre-networking effect. This is because the friction coefficient of the tensioning wire guide made of alumina is small, the friction 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 is basically the same as that of 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°.

[0055] The test shows 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 / m, and the network point fastness is light mesh grade.

[0056] Example A4

[0057] A method for preparing polyester DTY yarn is basically the same as that of 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°.

[0058] The test shows 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 / m, and the network point fastness is light mesh grade.

[0059] Example A5

[0060] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into a second network nozzle through a first roller, a first network nozzle, a tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller in sequence, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into a second network nozzle through a first roller, a tension meter, and a second roller in sequence, and then winding the polyester POY yarn and the polyester FDY yarn on a yarn drum through an auxiliary roller, a second heat box, a third roller, and an oiling wheel in sequence to obtain polyester DTY yarn;

[0061] Among them, the first network nozzle is Heibolin P213, with an aperture of 1.6mm and an elliptical shape; the tensioning wire guide is a concave open titanium oxide tensioning wire guide, and the friction coefficient of the tensioning wire guide is 0.4; the angle between the polyester POY yarn and the horizontal line 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 wire guide is 120°; the ratio of the speed 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 6m; the length of the polyester between the first roller and the first network nozzle is 0.35m; the length of the polyester between the first network nozzle and the tensioning wire guide is 0.15m;

[0062] Other process parameters are: network air pressure of the first network nozzle is 1.2 bar, vehicle speed is 600 m / min, first hot box temperature is 183°C, second hot box temperature is 156°C, network overfeed is 3.9%, shaping overfeed is 0.9%, winding overfeed is 0.25%, and 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 network density of the polyester POY yarn at the outlet of the first network nozzle is 48 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 326 dtex, a breaking strength of 3.05 cN / dtex, an elongation at break of 30.02%, a network density of 84 pieces / m, a curling shrinkage of 5.44%, and a boiling water shrinkage of 7.55%.

[0064] Example A6

[0065] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into a second network nozzle through a first roller, a first network nozzle, a tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller in sequence, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into a second network nozzle through a first roller, a tension meter, and a second roller in sequence, and then winding the polyester POY yarn and the polyester FDY yarn on a yarn drum through an auxiliary roller, a second heat box, a third roller, and an oiling wheel in sequence to obtain polyester DTY yarn;

[0066] Among them, the first network nozzle is Heibolin P213, with an aperture of 1.6mm and an elliptical shape; the tensioning wire guide is a concave open titanium oxide tensioning wire guide, and the friction coefficient of the tensioning wire guide is 0.7; the angle between the polyester POY yarn and the horizontal line 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 wire guide is 90°; the ratio of the speed 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 6m; the length of the polyester between the first roller and the first network nozzle is 0.5m; the length of the polyester between the first network nozzle and the tensioning wire guide is 0.2m;

[0067] Other process parameters are: network air pressure of the first network nozzle is 1.1 bar, vehicle speed is 600 m / min, first hot box temperature is 183°C, second hot box temperature is 156°C, network overfeed is 3.9%, shaping overfeed is 0.9%, winding overfeed is 0.25%, and 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 network density of the polyester POY yarn at the outlet of the first network nozzle is 50 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 327.63 dtex, a breaking strength of 3.01 cN / dtex, an elongation at break of 29.13%, a network density of 83 pieces / m, a curling shrinkage of 5.35%, and a boiling water shrinkage of 7.77%.

[0069] Example B1

[0070] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into the second network nozzle sequentially through a first roller, a first network nozzle, a first tensioning yarn guide, a second tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into the second network nozzle sequentially through a first roller, a tension meter, and a second roller, and then winding the polyester POY yarn and the polyester FDY yarn onto a yarn drum sequentially through an auxiliary roller, a second heat box, a third roller, and an oiling wheel to obtain polyester DTY yarn;

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

[0072] Other process parameters are: network air pressure of the first network nozzle is 1.0 bar, vehicle speed is 600 m / min, first hot box temperature is 183°C, second hot box temperature is 156°C, network overfeed is 3.9%, shaping overfeed is 0.9%, winding overfeed is 0.25%, and 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 density of the polyester POY yarn at the outlet of the first network nozzle is 50 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 326.08 dtex, a breaking strength of 3.14 cN / dtex, an elongation at break of 30.37%, a network density of 88 pieces / m, a curling shrinkage of 5.42%, and a boiling water shrinkage of 7.71%.

[0074] Example B2

[0075] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into the second network nozzle sequentially through a first roller, a first network nozzle, a first tensioning yarn guide, a second tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into the second network nozzle sequentially through a first roller, a tension meter, and a second roller, and then winding the polyester POY yarn and the polyester FDY yarn onto a yarn drum sequentially through an auxiliary roller, a second heat box, a third roller, and an oiling wheel to obtain polyester DTY yarn;

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

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

[0078] 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 52 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 326 dtex, a breaking strength of 3.05 cN / dtex, an elongation at break of 30.02%, a network density of 84 pieces / m, a curling shrinkage of 5.44%, and a boiling water shrinkage of 7.55%.

[0079] Example B3

[0080] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into the second network nozzle sequentially through a first roller, a first network nozzle, a first tensioning yarn guide, a second tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into the second network nozzle sequentially through a first roller, a tension meter, and a second roller, and then winding the polyester POY yarn and the polyester FDY yarn onto a yarn drum sequentially through an auxiliary roller, a second heat box, a third roller, and an oiling wheel to obtain polyester DTY yarn;

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

[0082] Other process parameters are: network air pressure of the first network nozzle is 0.6 bar, vehicle speed is 600 m / min, first hot box temperature is 183°C, second hot box temperature is 156°C, network overfeed is 3.9%, shaping overfeed is 0.9%, winding overfeed is 0.25%, and 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 density of the polyester POY yarn at the outlet of the first network nozzle is 55 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 327.63 dtex, a breaking strength of 3.01 cN / dtex, an elongation at break of 29.13%, a network density of 83 pieces / m, a curling shrinkage of 5.35%, and a boiling water shrinkage of 7.77%.

[0084] Example C1

[0085] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into the second network nozzle sequentially through a first roller, a first network nozzle, a first tensioning yarn guide, a second tensioning yarn guide, a third tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into the second network nozzle sequentially through the first roller, the tension meter, and the second roller, and then winding the polyester POY yarn and the polyester FDY yarn onto a yarn drum sequentially through an auxiliary roller, a second heat box, a third roller, and an oiling wheel, to obtain polyester DTY yarn;

[0086] Among them, the first network nozzle is Haibolin P213, with an aperture of 1.6mm 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 angle between the polyester POY yarn and the horizontal line of the inlet and outlet of the first network nozzle is 15°; the polyester POY yarn passes through the first tensioning wire guide, the second tensioning wire guide, and the third tensioning wire guide. The wrap angles of the three tensioning guides are all 165°; the ratio of the speed of the first roller to the second roller is 1.5, the length of the polyester between the first roller and the second roller is 6m; the length of the polyester between the first roller and the first network nozzle is 0.25m; the length of the polyester between the first network nozzle and the first tensioning guide is 0.1m; the length of the polyester between the first tensioning guide and the second tensioning guide, and the length of the polyester between the second tensioning guide and the third tensioning guide are both 0.05m;

[0087] Other process parameters are: the network air pressure of the first network nozzle is 0.6 bar, the vehicle speed is 600m / min, the first hot box temperature is 183℃, the second hot box temperature 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.

[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 density of the polyester POY yarn at the outlet of the first network nozzle is 55 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 326.08 dtex, a breaking strength of 3.14 cN / dtex, an elongation at break of 30.37%, a network density of 88 pieces / m, a curling shrinkage of 5.42%, and a boiling water shrinkage of 7.71%.

[0089] Example C2

[0090] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into the second network nozzle sequentially through a first roller, a first network nozzle, a first tensioning yarn guide, a second tensioning yarn guide, a third tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into the second network nozzle sequentially through the first roller, the tension meter, and the second roller, and then winding the polyester POY yarn and the polyester FDY yarn onto a yarn drum sequentially through an auxiliary roller, a second heat box, a third roller, and an oiling wheel, to obtain polyester DTY yarn;

[0091] Among them, the first network nozzle is Haibolin P213, with an aperture of 1.6mm 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 0.4; the angle between the polyester POY yarn and the horizontal line of the inlet and outlet of the first network nozzle is 50°; the polyester POY yarn passes through the first tensioning wire guide, the second tensioning wire guide, and the third tensioning wire guide. The wrap angle when the first tensioning wire guide is 130°; the ratio of the speed of the first roller to the second roller is 1.72, the length of polyester between the first roller and the second roller is 6m; the length of polyester between the first roller and the first network nozzle is 0.35m; the length of polyester between the first network nozzle and the first tensioning wire guide is 0.15m; the length of polyester between the first tensioning wire guide and the second tensioning wire guide, and the length of polyester between the second tensioning wire guide and the third tensioning wire guide are both 0.07m;

[0092] Other process parameters are: the network air pressure of the first network nozzle is 0.5 bar, the vehicle speed is 600 m / min, the first hot box temperature is 183°C, the second hot box temperature is 156°C, 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.

[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 density of the polyester POY yarn at the outlet of the first network nozzle is 57 pieces / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 326 dtex, a breaking strength of 3.05 cN / dtex, an elongation at break of 30.02%, a network density of 84 pieces / m, a curling shrinkage of 5.44%, and a boiling water shrinkage of 7.55%.

[0094] Example C3

[0095] A method for preparing polyester DTY yarn comprises feeding polyester POY yarn (specification of 350 dtex / 96f) into the second network nozzle sequentially through a first roller, a first network nozzle, a first tensioning yarn guide, a second tensioning yarn guide, a third tensioning yarn guide, a first heat box, a cooling plate, a false twister, a tension meter, and a second roller, and feeding polyester FDY yarn (specification of 110 dtex / 36f) into the second network nozzle sequentially through the first roller, the tension meter, and the second roller, and then winding the polyester POY yarn and the polyester FDY yarn onto a yarn drum sequentially through an auxiliary roller, a second heat box, a third roller, and an oiling wheel, to obtain polyester DTY yarn;

[0096] Among them, the first network nozzle is Haibolin P213, with an aperture of 1.6mm 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 0.7; the angle between the polyester POY yarn and the horizontal line of the inlet and outlet of the first network nozzle is 90°; the polyester POY yarn passes through the first tensioning wire guide, the second tensioning wire guide, The wrap angle of the third tensioning guide is 90°; the ratio of the speed of the first roller to the second roller is 1.85, the length of polyester between the first roller and the second roller is 6m; the length of polyester between the first roller and the first network nozzle is 0.5m; the length of polyester between the first network nozzle and the first tensioning guide is 0.2m; the length of polyester between the first tensioning guide and the second tensioning guide, and the length of polyester between the second tensioning guide and the third tensioning guide are both 0.1m;

[0097] Other process parameters are: the network air pressure of the first network nozzle is 0.4 bar, the vehicle speed is 600m / min, the first hot box temperature is 183℃, the second hot box temperature 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.

[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 density of the polyester POY yarn at the outlet of the first network nozzle is 60 / m, and the network point fastness is light mesh level; the final polyester DTY yarn has a linear density of 327.63 dtex, a breaking strength of 3.01 cN / dtex, an elongation at break of 29.13%, 83 network points / m, a curling shrinkage of 5.35%, and a boiling water shrinkage of 7.77%.

Claims

1. A method for low-tension interlacing of polyester, characterized in that: A first network nozzle and at least one tensioning guide are installed between the first roller and the second roller, and 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 network nozzle is networked.

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, and the first roller, the first network nozzle, and the tensioning wire guide are arranged at intervals along the wire feeding direction; 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°, and the wrap angle of the polyester when passing through the tensioning wire guide is 90-135°.

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 wire guides, and 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 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 wire guide is 90-150°, and the wrap angle of the polyester when passing through the second tensioning wire 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: There are three tensioning wire guides, and the first roller, the first network nozzle, the first tensioning wire guide, the second tensioning wire guide, and the third 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 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 wire guide is 90-165°, the wrap angle of the polyester when passing through the second tensioning wire guide is 90-165°, and the wrap angle of the polyester when passing through the third tensioning wire guide is 90-165°.

12. A polyester low tension interlacing method 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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