Polyester staple fiber production equipment and method based on six-wing hollow spinneret plate hole

Abstract

The invention relates to the technical field of synthetic fiber processing, in particular to polyester staple fiber production equipment and method based on six-wing hollow spinneret plate holes, and the production equipment comprises a spinneret device, an oiling device and a guide mechanism; the spinning device is used for extruding the melt raw materials to form fibers; the oiling device comprises a machine shell and an annular oil groove containing tiny-oil emulsion, and the annular oil groove is formed in the machine shell and located below the spinning device. The guide mechanism comprises a first guide ring and a lifting assembly used for controlling the first guide ring to ascend and descend, and the first guide ring is located in the annular oil groove. According to the oiling device, the function of oiling before fiber yarn bundling is achieved, the first guide ring is controlled to ascend and descend through the lifting assembly, the effect of adjusting the contact time of the fiber yarn and micro-oil emulsion is achieved, then the oiling amount and oiling uniformity of the fiber yarn are adjusted, and the oiling effect is improved. The problem that traditional equipment cannot control the oiling quantity and the oiling uniformity of the high profiled fibers is solved.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic fiber processing, and in particular to a polyester staple fiber production device and method based on six-wing hollow spinneret holes. Background Art

[0002] Polyester staple fiber is an important variety of synthetic fiber. The six-wing cross-section design makes the hollow polyester staple fiber more shaped and hollow. During the production process, the polymer PET melt needs to be oiled after being extruded through the spinneret hole to improve the interfacial properties of the fiber and play a role in lubrication and antistatic. If the oiling is uneven, the friction force on the fiber filaments will be different during the drafting process. The friction of the fiber filaments in the insufficiently oiled area is large, and it may be over-stretched during the drafting process, resulting in a decrease in fiber strength.

[0003] To this end, a Chinese patent with authorization announcement number CN221254897U discloses a fiber oil spraying device, in which a fixed material guide trough is arranged on the conveyor belt between the crimping machine and the oven, and the oil spraying part is fixed by a box body installed on the material guide trough, so that the oil spraying part is in a fixed state, and can stably spray oil on both sides of the fiber bundle, thereby making the oil on the surface of the fiber bundle more uniform, and the box body is sealed, which can reduce the possibility of the sprayed oil mist flying in the air, and ultimately can improve the quality of the finished fiber bundle.

[0004] However, during the processing, the six-wing cross-section hollow polyester staple fibers need to be bundled by a roller bundling device. During this process, the fiber filaments need to be oiled and de-oiled to ensure the structural strength of the fiber filaments and improve the production quality. However, the traditional oil spraying device has a poor oiling effect on the unbundled filaments, cannot ensure the uniformity of the oiling, and the amount of oiling cannot be controlled. Once too much oil is applied, a large amount of oil will remain on the subsequent processing equipment. During the fiber spinning process, too much oil will be contaminated on the rollers, leather rollers and other parts of the spinning machine, which will not only affect the normal operation of these parts, but also cause the fibers to be contaminated during the processing process. Too little oil may cause the fiber to pass through the processing equipment. When the fiber passes through the yarn guide, rollers and other equipment parts, due to the large friction, problems such as fiber entanglement and blockage are prone to occur. Summary of the invention

[0005] In view of the above problems, a polyester staple fiber production device and method based on six-wing hollow spinneret holes are provided, which solves the problem that traditional equipment cannot control the amount of oil applied through a spinneret device, an oiling device and a guiding mechanism.

[0006] In order to solve the problems of the prior art, the present invention provides a polyester staple fiber production equipment based on a six-wing hollow spinneret hole, comprising a spinneret device, an oiling device and a guiding mechanism; the spinneret device is used to extrude a molten raw material to form fiber filaments; the oiling device comprises a casing and an annular oil tank containing a micro-oil emulsion, the annular oil tank is arranged in the casing, and the annular oil tank is located below the spinneret device; the guiding mechanism comprises a first guide ring and a lifting assembly for controlling the lifting of the first guide ring, the first guide ring is located in the annular oil tank; in a working state, the fiber filaments are laid on the first guide ring after being formed, and when the lifting assembly controls the first guide ring to move downward, the first guide ring presses part of the fiber filaments into the micro-oil emulsion in the annular oil tank.

[0007] Preferably, the lifting assembly includes a mounting ring, a linear drive and an annular frame; the mounting ring is arranged in the shell; the linear drive is arranged on the mounting ring, and the driving end of the linear drive is connected to the annular frame; a support rod is provided on the annular frame, and the support rod is connected to the first guide ring.

[0008] Preferably, the first guide ring is provided with guide grooves for guiding the movement of the fiber filaments, and at least three guide grooves are provided, and the plurality of guide grooves are distributed in a ring array about the axis of the first guide ring.

[0009] Preferably, the first guide ring is hollow, and a first oil injection port is provided in a guide groove of the first guide ring.

[0010] Preferably, a second guide ring that can be raised and lowered is provided in the annular oil groove; an arc-shaped edge is provided on the annular oil groove, a transmission assembly is provided on the arc-shaped edge, the second guide ring is connected to the support rod through the transmission assembly, and a second oil injection port is provided on the arc-shaped edge.

[0011] Preferably, the transmission assembly includes a bracket, a guide frame and a connecting rod; the bracket is arranged on the arc edge, and a bent rod is provided on the bracket; the guide frame is arranged on the second guide ring, and a first straight groove is provided on the guide frame; the connecting rod is rotatably arranged on the bent rod, and a fixed shaft is respectively provided at both ends of the connecting rod, and a second straight groove is opened on the support rod of the annular frame, and the two fixed shafts on the connecting rod are respectively slidably matched with the first straight groove and the second straight groove.

[0012] Preferably, a scraper bar is provided on the second guide ring to prevent the micro-oil emulsion from flowing along the fiber filaments.

[0013] Preferably, an annular cooling box for cooling the fiber filaments is provided between the spinning device and the oiling device.

[0014] Preferably, the spinning device comprises a six-wing hollow disk, on which at least three groups of spinning holes are formed, and each group of spinning holes comprises three extrusion ports distributed in a circular array.

[0015] A method for producing polyester staple fibers based on six-wing hollow spinneret holes comprises the following steps:

[0016] S1. Purified terephthalic acid (PTA), ethylene glycol (MEG) and an environmentally friendly titanium catalyst are fully mixed in a slurry tank according to a fixed molar ratio; the prepared slurry enters the first and second esterification reactors in turn, and performs an esterification reaction under the conditions of catalyst, certain temperature and vacuum; the fully reacted esterified product enters the pre-polycondensation reactor, and performs a catalytic polycondensation reaction under the action of the catalyst; the polymer reaching a certain viscosity enters the final polycondensation reactor, and continues to perform a polycondensation reaction under certain temperature and pressure (vacuum) conditions to obtain an antimony-free environmentally friendly polyester melt with the viscosity required for fiber production;

[0017] S2, using antimony-free environmentally friendly polyester melt as raw material, the polyester melt is sent into the box through the pipeline, and enters the spinning device after being accurately measured by the metering pump. After being filtered by metal sand and stainless steel mesh, melt spinning is carried out. The melt pipeline temperature is 274°C and the box temperature is 272°C;

[0018] S3, the fiber filaments are guided by the first guide ring into the micro-oil emulsion in the annular oil groove, and extend from the bottom of the annular oil groove through the first guide ring;

[0019] S4, after oiling, the fiber yarn is cut, dried, packaged and other post-processing treatments to obtain 6.67dtex×32mm six-wing hollow antimony-free polyester staple fibers. Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The present invention realizes the function of oiling the fiber filaments before bundling them through a spinning device, an oiling device and a guide mechanism, and controls the lifting and lowering of the first guide ring through a lifting component to achieve the effect of adjusting the contact time between the fiber filaments and the micro-oil emulsion, thereby adjusting the oiling amount of the fiber filaments, solving the problem that traditional equipment cannot control the oiling amount.

[0021] 2. The present invention realizes the function of adjusting the contact time between the fiber and the micro-oil emulsion through the second guide ring, the transmission component and the arc edge. During the processing, the micro-oil emulsion is supplied through the first oil injection port on the first guide ring, and the micro-oil emulsion flows into the annular oil groove along the fiber under the action of gravity. Then the operator recovers the micro-oil emulsion through the oil discharge pipe of the annular oil groove, and controls the oil amount in the annular oil groove by controlling the recovery speed of the micro-oil emulsion, thereby accurately adjusting the oiling amount of the fiber.

[0022] 3. The present invention realizes the function of controlling the second guide ring to move in the opposite direction when the first guide ring moves through the bracket, the bent rod, the guide frame and the connecting rod. When the linear drive drives the annular frame to move upward, the annular frame drives the support rod to move upward, and the support rod drives the first guide ring to move upward. The second straight groove on the support rod pushes the fixed shaft on the connecting rod, thereby driving the connecting rod to rotate. The fixed shaft at the other end of the connecting rod pushes the first straight groove on the guide frame, thereby driving the guide frame to move downward. The guide frame drives the second guide ring to move, and the fiber filament is driven to move through the second guide ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0024] Figure 2 It is a three-dimensional schematic diagram of an oiling device and a guide mechanism in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0025] Figure 3 It is a three-dimensional schematic diagram of the internal structure of the casing of an oiling device in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0026] Figure 4 The present invention Figure 3 A local enlarged schematic diagram of point A in the middle.

[0027] Figure 5 It is a three-dimensional schematic diagram of a guide mechanism in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0028] Figure 6 The present invention Figure 5 A local enlarged schematic diagram of point B in the middle.

[0029] Figure 7 It is a three-dimensional exploded schematic diagram of a transmission component in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0030] Figure 8 It is a cross-sectional schematic diagram of a guide mechanism in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0031] Fig. 9 The present invention Figure 8 A partial enlarged schematic diagram of point C in the middle.

[0032] Fig.10 It is a three-dimensional schematic diagram of a six-wing hollow disk in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0033] Fig.11It is a schematic cross-sectional view of fiber filaments when they are not bonded in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention.

[0034] Fig.12 It is a cross-sectional schematic diagram of fiber filaments in a polyester staple fiber production device based on six-wing hollow spinneret holes of the present invention after the fiber filaments form a six-wing hollow structure due to adhesion.

[0035] The numbers in the figure are: 1, spinneret; 11, six-wing hollow disk; 111, spinneret hole; 2, oiling device; 21, casing; 22, annular oil groove; 221, oil drain pipe; 222, arc edge; 222, second oil injection port; 3, guide mechanism; 31, first guide ring; 311, guide groove; 312, first oil injection port; 32, lifting assembly; 321, mounting ring; 322, linear drive; 323, annular frame; 3231, support rod; 3232, second straight groove; 33, second guide ring; 331, scraper; 34, transmission assembly; 341, bracket; 3411, bending rod; 342, guide frame; 3421, first straight groove; 343, connecting rod; 3431, fixed shaft; 4, annular cooling box; 5, fiber filament. DETAILED DESCRIPTION

[0036] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Reference Figure 1-Figure 3 : A polyester staple fiber production equipment based on a six-wing hollow spinneret hole, comprising a spinneret 1, an oiling device 2 and a guiding mechanism 3; the spinneret 1 is used to extrude a molten raw material to form fiber filaments 5; the oiling device 2 comprises a casing 21 and an annular oil groove 22 containing a micro-oil emulsion, the annular oil groove 22 is arranged in the casing 21, and the annular oil groove 22 is located below the spinneret 1; the guiding mechanism 3 comprises a first guide ring 31 and a lifting component 32 for controlling the lifting of the first guide ring 31, and the first guide ring 31 is located in the annular oil groove 22; in a working state, the fiber filaments 5 are formed and laid on the first guide ring 31, and when the lifting component 32 controls the first guide ring 31 to move downward, the first guide ring 31 presses part of the fiber filaments 5 into the micro-oil emulsion in the annular oil groove 22.

[0038] The present invention realizes the function of oiling the fiber filaments 5 before bundling them through the spinning device 1, the oiling device 2 and the guide mechanism 3, and controls the lifting and lowering of the first guide ring 31 through the lifting component 32, so as to adjust the contact time between the fiber filaments 5 and the micro-oil emulsion, thereby adjusting the oiling amount of the fiber filaments 5, and solving the problem that the traditional equipment cannot control the oiling amount. A controller for human-machine interaction is provided on the housing, and the lifting component 32 is electrically connected to the controller. After the fiber filaments 5 are oiled, they are bundled by a roller bundling device, which is not shown in the figure. In the working state, the melt raw material is first extruded into the fiber filaments 5 by the spinning device 1, and the fiber filaments 5 extend from the bottom of the annular oil groove 22 after passing through the first guide ring 31, and then the fiber filaments 5 are deoiled and bundled by the roller bundling device, and the roller bundling device pulls the fiber filaments 5 to move. During the movement of the fiber filaments 5, the height of the first guide ring 31 is adjusted by the lifting component 32. When the first guide ring 31 moves downward, it pushes the fiber filament 5 downward, so that the oil injection section of the fiber filament 5 that penetrates into the annular oil groove 22 is increased, thereby increasing the contact time between the fiber filament 5 and the micro-oil emulsion during the processing and increasing the amount of oil applied; when the first guide ring 31 moves upward, the fiber filament 5 rises accordingly under the action of tension and abuts against the first guide ring 31, thereby reducing the length of the oil injection section of the fiber filament 5 and reducing the amount of oil applied.

[0039] Reference Figure 3-Figure 5 : The lifting assembly 32 includes a mounting ring 321, a linear driver 322 and an annular frame 323; the mounting ring 321 is arranged in the shell; the linear driver 322 is arranged on the mounting ring 321, and the driving end of the linear driver 322 is connected to the annular frame 323; a support rod 3231 is provided on the annular frame 323, and the support rod 3231 is connected to the first guide ring 31.

[0040] The present invention realizes the function of controlling the lifting of the first guide frame by installing the ring 321, the linear driver 322 and the annular frame 323. The linear driver 322 is preferably a linear cylinder, and the linear driver 322 is electrically connected to the controller. A plurality of support rods 3231 are provided, and the plurality of support rods 3231 are distributed in an annular array along the axis of the annular frame 323. The support rods 3231 are located in the gaps between the bundles of fiber filaments 5 to prevent the support rods 3231 from affecting the normal movement of the fiber filaments 5. When adjusting the height of the first guide ring 31, the operator sends a signal to the linear driver 322 through the controller. After receiving the signal, the linear driver 322 drives the annular frame 323 to move. The annular frame 323 drives the first guide ring 31 to move through the support rods 3231 to adjust the height of the first guide ring 31.

[0041] Reference Figure 3-Figure 6The first guide ring 31 is provided with a guide groove 311 for guiding the movement of the fiber filament 5. There are at least three guide grooves 311, and the plurality of guide grooves 311 are distributed in a ring array about the axis of the first guide ring 31.

[0042] The present invention realizes the function of guiding the movement of the fiber filament 5 through a plurality of guide grooves 311, and achieves the effect of guiding and diverting the fiber filament 5. In the production process, in order to avoid adhesion between adjacent fiber filaments 5, a gap is provided between each fiber filament 5, and when oiling is directly performed, the fiber filament 5 can be evenly oiled. When the fiber filament 5 is guided to move by the first guide ring 31, the fiber filament 5 will be bent. In order to avoid friction between the fiber filament 5 when the first guide ring 31 guides the movement of the fiber filament 5, the surface of the first guide ring 31 is relatively smooth, and when the fiber filament 5 is set on the first guide ring 31, it may be offset, thereby blocking each other, causing the internal fiber filament 5 to be unable to contact with the micro-oil emulsion. For this reason, a plurality of guide grooves 311 are provided on the first guide ring 31, and the fiber filament 5 is prevented from being offset by the cooperation of the guide groove 311 and the fiber filament 5.

[0043] Reference Figure 5 and Figure 6 The first guide ring 31 is hollow, and a first oil injection port 312 is provided in the guide groove 311 of the first guide ring 31 .

[0044] The present invention opens a first oil injection port 312 in the guide groove 311 of the first guide ring 31. An oil drain pipe 221 is provided on the annular oil groove 22. During operation, the micro-oil emulsion is sprayed out through the first oil injection port 312 on the first guide ring 31, so that the fiber filament 5 can be in stable contact with the micro-oil emulsion. When the first guide ring 31 moves under the drive of the lifting assembly 32, the length of the contact section of the fiber filament 5 with the first guide ring 31 will also change due to the tension. When the first guide ring 31 moves upward, the length of the oil injection section of the fiber filament 5 extending into the micro-oil emulsion in the annular oil groove 22 is reduced, and at the same time, the length of the contact section of the fiber filament 5 with the first guide ring 31 is also reduced, thereby reducing the amount of oil applied to the fiber filament 5.

[0045] Reference Figure 3-Figure 6 and Figure 8 : A second guide ring 33 that can be raised and lowered is provided in the annular oil groove 22; an arcuate edge 222 is provided on the annular oil groove 22, a transmission assembly 34 is provided on the arcuate edge 222, the second guide ring 33 is connected to the support rod 3231 through the transmission assembly 34, and a second oil injection port 2221 is provided on the arcuate edge 222.

[0046] The present invention realizes the function of adjusting the length of the oil injection section of the fiber filament 5 through the second guide ring 33, the transmission assembly 34 and the arc edge 222. By supplying oil through the first oil injection port 312 on the first guide ring 31 and the second oil injection port 2221 on the arc edge 222, when adjusting the height of the first guide ring 31, although the length of the contact section and the oil injection section of the fiber filament 5 can be adjusted synchronously, when performing precise adjustment, the height of the first guide ring 31 has too much influence on the oiling amount of the fiber filament 5. During the adjustment process, the operator needs to repeatedly adjust the height of the first guide ring 31, so that the adjustment accuracy of the oiling amount is limited. For this reason, the second guide ring 33 and the transmission assembly 34 are provided. When the first guide ring 31 moves up, the first guide ring 31 controls the second guide ring 33 to move down through the transmission assembly 34, and the fiber filament 5 is pressed into the annular oil groove 22. At this time, the length of the contact section where the fiber filament 5 abuts against the first guide ring 31 is reduced, but the length of the oil injection section of the fiber filament 5 can still be guaranteed by the downward movement of the second guide ring 33. During the processing, the micro-oil emulsion is supplied through the first oil injection port 312 on the first guide ring 31, and the micro-oil emulsion flows into the annular oil groove 22 along the fiber under the action of gravity. Then the operator recovers the micro-oil emulsion through the oil discharge pipe 221 of the annular oil groove 22, and then controls the oiling length of the fiber filament 5 between the first oil injection port 312 and the second oil injection port 2221 to accurately adjust the oiling amount of the fiber filament 5.

[0047] Reference Figure 3 , Figure 4 and Figure 7 The transmission assembly 34 includes a bracket 341, a guide frame 342 and a connecting rod 343; the bracket 341 is arranged on the arc edge 222, and a bent rod 3411 is provided on the bracket 341; the guide frame 342 is arranged on the second guide ring 33, and a first straight groove 3421 is provided on the guide frame 342; the connecting rod 343 is rotatably arranged on the bent rod 3411, and a fixed shaft 3431 is respectively provided at both ends of the connecting rod 343, and a second straight groove 3232 is opened on the support rod 3231 of the annular frame 323, and the two fixed shafts 3431 on the connecting rod 343 are respectively slidably matched with the first straight groove 3421 and the second straight groove 3232.

[0048] The present invention realizes the function of controlling the second guide ring 33 to move in the opposite direction when the first guide ring 31 moves through the bracket 341, the bent rod 3411, the guide frame 342 and the connecting rod 343. When the linear driver 322 drives the annular frame 323 to move upward, the annular frame 323 drives the support rod 3231 to move upward, and the support rod 3231 drives the first guide ring 31 to move upward. The second straight groove 3232 on the support rod 3231 pushes the fixed shaft 3431 on the connecting rod 343, thereby pushing the connecting rod 343 to rotate, and the fixed shaft 3431 at the other end of the connecting rod 343 pushes the first straight groove 3421 on the guide frame 342, thereby pushing the guide frame 342 to move downward, and the guide frame 342 drives the second guide ring 33 to move, and the fiber filament 5 is pushed to move through the second guide ring 33.

[0049] Reference Figure 3 , Figure 4 , Figure 8 and Fig. 9 : A scraper strip 331 is provided on the second guide ring 33 to prevent the micro-oil emulsion from flowing along the fiber filament 5.

[0050] The present invention realizes the function of preventing the micro-oil emulsion from flowing out of the annular oil groove 22 through the scraper bar 331. Since the fiber filament 5 will be sprayed with oil in the annular oil groove 22, more micro-oil emulsion will be attached to the fiber filament 5. And the fiber filament 5 will adjust its position along with the first guide ring 31 and the second guide ring 33. As the fiber filament 5 moves, the micro-oil emulsion will flow out of the annular guide groove along the fiber filament 5. The micro-oil emulsion will be stained on the roller, which will affect the holding force of the roller, resulting in uneven fiber drafting, thereby affecting the quality of the yarn, such as the strength of the yarn, the uniformity of the yarn, etc. Even if a degreasing device is provided, excessive micro-oil emulsion will still cause a large amount of micro-oil emulsion to be contaminated with the overflow of the fiber, affecting the recovery of the micro-oil emulsion. For this reason, a raised scraper bar 331 is provided on the second guide ring 33, and the micro-oil emulsion attached to the fiber is scraped off by the scraper bar 331 to reduce the waste of micro-oil emulsion.

[0051] Reference Figure 1 : An annular cooling box 4 for cooling the fiber filaments 5 is provided between the spinning device 1 and the oiling device 2.

[0052] The present invention realizes the function of rapidly cooling high-temperature fibers through the annular cooling box 4, while preventing the fibers from sticking together. A wind shield is installed at the bottom of the annular cooling box 4, and the height of the wind shield is 115 mm, which increases the cooling air outlet area. In order to maintain a high cooling wind speed, the cooling air volume is increased, and the quenching effect is enhanced, so that the three-dimensional curl of the hollow polyester staple fiber is smaller and more elastic. When the fiber filaments 5 ejected by the spinneret 1 pass through the annular cooling box 4, the annular cooling box 4 radially and evenly supplies air to cool and shape the fiber filaments 5, thereby improving the chemical stability of the fiber and preventing thermal degradation. At the same time, it can greatly improve production efficiency and reduce the production of defective products.

[0053] Reference Figure 1 , Figure 10-12 The spinning device 1 comprises a six-wing hollow disk 11, on which at least three groups of spinning holes 111 are formed, and each group of spinning holes 111 comprises three extrusion ports distributed in a ring array.

[0054] The present invention realizes the function of manufacturing special-shaped fibers through the six-wing hollow disk 11. The spinneret hole 111 is specifically a 3C-type hollow shape with six wings. The six-wing hollow disk 11 is a six-wing 3C-type hollow spinneret, the fineness of the original yarn is 18.5dtex, the number of holes is 840 holes, and the fineness of the finished fiber is 6.89dtex. The 3C hole type can increase the hollowness of the hollow polyester staple fiber, improve the elasticity and thermal insulation and breathability of the fiber; the six-wing cross-section gives the fiber moisture removal and quick-drying functions, and makes the fiber more fluffy and the elastic effect more significant. Hollow fibers have good thermal insulation due to the cavity inside. By controlling the shape and structure of the spinneret hole 111, fibers of various shapes can be accurately manufactured to meet different product requirements. The molten raw material is ejected through the six-wing hollow disk 11 to form filaments with a six-wing structure. Since the raw material is in a high temperature state in the pipeline, when the filaments with the six-wing structure are ejected, three filaments are ejected from the extrusion port of the same group of spinneret holes 111. The structure of the three filaments separated is bonded together due to the high temperature to form a six-wing hollow structure. The six-wing hollow antimony-free polyester staple fiber has a large degree of irregularity and hollowness, and is difficult to fiberize. The temperature of the melt pipeline is reduced to 274°C, and the temperature of the spinning box is reduced to 272°C to solve the problems of stiff and broken yarns in the spinning process, ensuring smooth spinning. Compared with conventional single C-type hollow polyester staple fibers, the six-wing 3C-type hollow spinneret designed by the present invention makes the six-wing hollow antimony-free polyester staple fibers have a larger degree of irregularity and hollowness. The phenomenon of stiff and broken yarns and post-processing roller winding in the spinning production process will be more serious. The present invention solves the problems of stiff and broken yarns and post-spinning stretching roller winding in the present invention by adjusting the front and back spinning processes.

[0055] Reference Figure 1-Figure 3 :A method for producing polyester staple fibers based on six-wing hollow spinneret holes, comprising the following steps: S1, fully mixing purified terephthalic acid (PTA), ethylene glycol (MEG) and an environmentally friendly titanium-based catalyst in a slurry tank according to a fixed molar ratio; the prepared slurry enters the first and second esterification reactors in sequence, and performs an esterification reaction under the conditions of a catalyst, a certain temperature and a vacuum degree; the fully reacted esterified product enters the pre-condensation reactor, and performs a catalytic polycondensation reaction under the action of the catalyst; the polymer reaching a certain viscosity enters the final polycondensation reactor, and continues to perform a polycondensation reaction under certain temperature and pressure (vacuum) conditions to obtain an antimony-free environmentally friendly polyester melt with the required viscosity for fiber filament 5 production;

[0056] S2, using antimony-free environmentally friendly polyester melt as raw material, the polyester melt is fed into the box through a pipeline, and after being accurately metered by a metering pump, enters the spinneret 1, and after being filtered by metal sand and stainless steel mesh, melt spinning is performed. The melt pipeline temperature is 274°C, and the box temperature is 272°C;

[0057] S3, the fiber filament 5 enters the micro-oil emulsion in the annular oil groove 22 through the guidance of the first guide ring 31, and extends out from the bottom of the annular oil groove 22 through the first guide ring 31;

[0058] After being oiled, S4 and fiber filament 5 are subjected to post-processing such as cutting, drying, and packaging to obtain 6.67 dtex×32 mm six-wing hollow antimony-free polyester staple fibers.

[0059] The most prominent feature of the product obtained by the production method of the present invention is good elasticity, warmth retention, air permeability, moisture absorption and dehumidification effects, and the fibers are fluffy, soft and skin-friendly. The six-wing cross-section design allows the hollow staple fibers to have higher profile and hollowness, and forms six grooves on the fiber surface, making the elasticity, moisture absorption and dehumidification effects of the fibers more significant. Polyester staple fibers are lacking in environmental protection, resilience, skin-friendly warmth retention and breathability, moisture absorption and perspiration removal, etc., which to a certain extent also limits its scope of application. Our invention makes up for the defects in this aspect very well. The polyester staple fibers are environmentally friendly, warm, resilient, breathable, moisture absorption and dehumidification, fluffy, soft and skin-friendly. The properties of the polyester staple fibers are the same as those of animal hair, and they can be blended with animal hair such as wool and rabbit hair to make artificial fur. They have high-end uses and higher product added value.

[0060] The environmentally friendly titanium catalyst described in step S1 is in the form of nano-titanium-based oligomers, mixed with ethylene glycol, has good chemical stability and efficient catalytic performance, has catalytic effects on esterification and polycondensation reactions, can reduce the esterification reaction temperature, shorten the esterification and polycondensation time, can completely replace the antimony catalyst, and ensure the antimony-free and environmentally friendly melt. When polyester is polymerized, an environmentally friendly titanium catalyst is used instead of a conventional antimony catalyst, and a new six-wing 3C hollow spinneret is used to produce six-wing hollow antimony-free polyester staple fibers, which fully amplifies the advantages of polyester staple fibers.

[0061] In step S2, the environmentally friendly polyester melt is filtered through metal sand and stainless steel mesh and then spun through a six-wing hollow disk 11. The obtained raw yarn 2 is cooled through an annular cooling box 4, and the central wind speed of the annular cooling box 4 is 8.0 m / s, the wind temperature is 20° C., and the humidity is greater than 70%.

[0062] In step S3, the annular oil tank 22 uses YCD-1065 oil, with an oil concentration of 0.30% and an oil-water content of 22%. After the oiling is completed, the roller bundling device steering technology is used, and then an eight-roller traction machine and a feeding wheel are used for traction and transportation, and the eight-roller traction machine and the feeding wheel are not shown in the figure. The speed ratio of the eight-roller traction machine and the feeding wheel is: 1 roller / 2 roller: 0.999, 2 roller / 3 roller: 0.999, 3 roller / 4 roller: 0.999, 4 roller / 5 roller: 1.001, 5 roller / 6 roller: 0.999, 6 roller / 7 roller: 0.998, 7 roller / 8 roller: 0.998, 8 roller / wire roller: 1.025, wire roller / feeding wheel 1.086, and the wire roller speed is 1150m / min; finally, the fiber is fed into the wire barrel by a reciprocating machine to obtain a six-wing hollow antimony-free polyester staple fiber precursor. The six-wing hollow composite polyester staple fiber raw yarn is subjected to bundling, wire guiding, water bath drawing, steam heating box, crimping, oiling, cutting, drying and packaging. Among them, the water bath drawing temperature is 72℃, the main pressure of the crimping machine is 0.15MPa, the concentration of the wool type special oil agent is 1.0%, and the drying machine temperature is 135℃, and finally 6.67dtex×32mm six-wing hollow antimony-free polyester staple fiber is obtained.

[0063] The six-wing hollow antimony-free polyester staple fiber produced by this embodiment was tested for physical and mechanical properties, and the fiber fineness was 6.89 dtex, the hollow rate was 39%, the number of crimps was 8.2 / 25mm, the crimp rate was 23.5%, the bulkiness V1195cm3 / g, the bulkiness V255cm3 / g, the compression elasticity was 73%, and the oil content was 0.10%.

[0064] During the entire production process, the number of broken wires in the component was replaced 2 times / 24 hours, the number of stiff and doubling wires in the front spinning was 5 times / 24 hours, the number of broken wires was 2 times, and the number of stretching and winding rollers in the back spinning was 3 times / 24 hours.

[0065] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A polyester staple fiber production device based on six-wing hollow spinneret holes, characterized in that: It comprises a spinning device (1), an oiling device (2) and a guiding mechanism (3); The spinning device (1) is used to extrude the molten raw material into fiber filaments (5); The oiling device (2) comprises a housing (21) and an annular oil groove (22) containing micro-oil emulsion, wherein the annular oil groove (22) is arranged in the housing (21) and is located below the spinning device (1); The guide mechanism (3) comprises a first guide ring (31) and a lifting assembly (32) for controlling the lifting of the first guide ring (31); the first guide ring (31) is located in the annular oil groove (22); In the working state, the fiber filaments (5) are formed and placed on the first guide ring (31). When the lifting component (32) controls the first guide ring (31) to move downward, the first guide ring (31) presses part of the fiber filaments (5) into the micro-oil emulsion in the annular oil groove (22).

2. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 1, characterized in that: The lifting assembly (32) includes a mounting ring (321), a linear drive (322) and an annular frame (323); The mounting ring (321) is arranged in the housing; The linear driver (322) is arranged on the mounting ring (321), and the driving end of the linear driver (322) is connected to the annular frame (323); A support rod (3231) is provided on the annular frame (323), and the support rod (3231) is connected to the first guide ring (31).

3. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 1, characterized in that: The first guide ring (31) is provided with a guide groove (311) for guiding the movement of the fiber filament (5), and at least three guide grooves (311) are provided. The plurality of guide grooves (311) are distributed in a ring array about the axis of the first guide ring (31).

4. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 3, characterized in that: The first guide ring (31) is hollow, and a first oil injection port (312) is provided in the guide groove (311) of the first guide ring (31).

5. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 2, characterized in that: A second guide ring (33) capable of being raised and lowered is arranged in the annular oil groove (22); The annular oil groove (22) is provided with an arc-shaped edge (222), a transmission assembly (34) is provided on the arc-shaped edge (222), the second guide ring (33) is transmission-connected to the support rod (3231) via the transmission assembly (34), and a second oil injection port (2221) is provided on the arc-shaped edge (222).

6. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 5, characterized in that: The transmission assembly (34) includes a bracket (341), a guide frame (342) and a connecting rod (343); The bracket (341) is arranged on the arc-shaped edge (222), and a bent rod (3411) is arranged on the bracket (341); The guide frame (342) is arranged on the second guide ring (33), and a first straight groove (3421) is provided on the guide frame (342); The connecting rod (343) is rotatably arranged on the bent rod (3411), and a fixed shaft (3431) is respectively arranged at both ends of the connecting rod (343). A second straight groove (3232) is opened on the supporting rod (3231) of the annular frame (323), and the two fixed shafts (3431) on the connecting rod (343) are respectively slidably matched with the first straight groove (3421) and the second straight groove (3232).

7. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 5, characterized in that: The second guide ring (33) is provided with a scraper (331) for preventing the micro-oil emulsion from flowing along the fiber filaments (5).

8. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 1, characterized in that: An annular cooling box (4) for cooling the fiber filaments (5) is provided between the spinning device (1) and the oiling device (2).

9. The polyester staple fiber production equipment based on six-wing hollow spinneret holes according to claim 1, characterized in that: The spinning device (1) comprises a six-wing hollow disk (11), on which at least three groups of spinning holes (111) are opened, and each group of spinning holes (111) comprises three extrusion ports distributed in a ring array.

10. A method for producing polyester staple fibers based on six-wing hollow spinneret holes, using a polyester staple fiber production device based on six-wing hollow spinneret holes as described in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, fully mixing purified terephthalic acid (PTA), ethylene glycol (MEG) and an environmentally friendly titanium catalyst in a slurry tank according to a fixed molar ratio; the prepared slurry enters the first and second esterification reactors in turn, and performs an esterification reaction under the conditions of a catalyst, a certain temperature and a vacuum degree; the fully reacted esterified product enters the pre-polycondensation reactor, and performs a catalytic polycondensation reaction under the action of the catalyst; the polymer reaching a certain viscosity enters the final polycondensation reactor, and continues to perform a polycondensation reaction under certain temperature and pressure (vacuum) conditions to obtain an antimony-free environmentally friendly polyester melt with the required viscosity for fiber filament (5) production; S2, using antimony-free environmentally friendly polyester melt as raw material, the polyester melt is fed into the box through a pipeline, and after being accurately metered by a metering pump, enters the spinning device (1), and after being filtered by metal sand and stainless steel mesh, melt spinning is performed, the melt pipeline temperature is 274°C, and the box temperature is 272°C; S3, the fiber filaments (5) are guided by the first guide ring (31) into the micro-oil emulsion of the annular oil groove (22), and extend out from the bottom of the annular oil groove (22) through the first guide ring (31); S4, after being oiled, the fiber filaments (5) are cut, dried, and packaged to obtain 6.67dtex×32mm six-wing hollow antimony-free polyester staple fibers.

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