A manufacturing process for W-section regenerated semi-light fiber

Abstract

This invention discloses a manufacturing process for W-section recycled semi-dull fiber. A screw extruder is used to melt-extrude crystallized and dried recycled semi-dull PET chips to obtain a spinning melt. The melt is then transported to a spinning box, metered by a metering pump, and forced into a spinning assembly for spinning. The resulting nascent fiber bundle undergoes post-heating, airless cooling, ring-blown cooling, bundling and oiling, pre-networking, stretching and setting, and winding to obtain W-section recycled semi-dull fiber. During spinning, the spinneret of the spinning assembly includes concentrically distributed spinnerets with inner and outer rings. The discharge end of each spinneret has a W-shaped cross-section composed of four lobes, with the included angle between two connected lobes being 60°. The fiber surface manufactured by this invention has microgrooves that generate micropore capillary water absorption, effectively accelerating the fiber's moisture absorption and quick-drying effect, meeting consumers' higher requirements for moisture-wicking fabrics.

Description

Technical Field

[0001] This invention relates to the field of fiber technology, and more specifically, to a manufacturing process for W-section regenerated semi-glossy fiber. Background Technology

[0002] Fibers are the prerequisite for developing textile products. The emergence of irregularly shaped cross-section fibers has greatly enriched fiber varieties, providing abundant raw materials for the development of new clothing fabrics and textile products. Therefore, irregularly shaped cross-section fibers have received widespread attention, development, and utilization in the textile market. Currently, most irregularly shaped cross-section fibers on the market are cross-shaped fibers. Although they have moisture-wicking properties, their quick-drying effect is not ideal. Therefore, there is still a need to develop a fiber with better moisture-wicking and quick-drying properties. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a manufacturing process for W-section regenerated semi-glossy fiber, in which the surface of the resulting fiber has micro-grooves that can generate micropore capillary water absorption to effectively accelerate the moisture absorption and quick-drying effect of the fiber.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A manufacturing process for W-section recycled semi-dull fiber involves using a screw extruder to melt-extrude crystallized and dried recycled semi-dull PET chips to obtain a spinning melt. The melt is then transported to a spinning box, metered by a metering pump, and pressed into a spinning assembly for spinning. The resulting nascent fiber bundle undergoes post-heating, airless cooling, ring-blown cooling, bundling and oiling, pre-networking, stretching and shaping, and winding to obtain W-section recycled semi-dull fiber. During spinning, the spinneret of the spinning assembly includes spinnerets with concentric inner and outer rings. The discharge end of the spinneret has a W-shaped cross-section composed of four blades, with the included angle between two connected blades being 60°.

[0006] Each leaf is 0.28 mm long and 0.07 mm wide.

[0007] The spinnerets are distributed in three concentric circles, with the inner circle of spinnerets evenly distributed in circles of 44mm diameter, the middle circle of spinnerets evenly distributed in circles of 44mm diameter, and the outer circle of spinnerets evenly distributed in circles of 64mm diameter.

[0008] The inner ring has 20 spinnerets, the middle ring has 24 spinnerets, and the outer ring has 28 spinnerets.

[0009] The crystallization temperature of recycled semi-dull PET chips is 158-160℃, the drying temperature is 160-165℃, the drying air pressure is 0.08Mpa, and the drying time is 8-11h.

[0010] The heating temperatures of the screw extruder in zones one through five are 278℃, 282℃, 288℃, 290℃, and 292℃, respectively. The extrusion pressure of the screw extruder is 14.5MPa, and the pressure after filtration is 9.4MPa.

[0011] The spinning temperature was 294.1℃; the metering pump supply was 34g / min.

[0012] The post-heating temperature is 255℃; the height of the windless zone is 54mm; the air pressure for the ring-blowing cooling is 50Pa; the height of the oil nozzle when applying oil to the bundle is 1100mm; the distance between the bundle guide hook and the oil nozzle is 200mm; and the oil concentration is 11wt%.

[0013] The pre-network pressure is 0.06 MPa; during the stretching and setting process, the first stretching roller speed is 2590 m / min, and the second stretching roller speed is 2600 m / min; during the winding and forming process, the winding speed is 2576 m / min, and the winding tension is 10 cN.

[0014] The beneficial effects of this invention are:

[0015] Through process improvements, recycled polyester fibers with W-shaped cross sections are manufactured. The fiber surface has micro-grooves that can generate micropore capillary water absorption, effectively accelerating the fiber's moisture absorption and quick-drying effect, thus meeting consumers' higher standards for moisture-wicking fabrics. Attached Figure Description

[0016] Figure 1 This is a top view of the spinneret.

[0017] Figure 2 This is a cross-sectional view of the spinneret outlet end;

[0018] Figure 3 This is a schematic diagram of fibers passing through an impregnation tank;

[0019] Figure 4 Structural diagram of the improved post-crystallization drying apparatus;

[0020] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0021] Figure 6 for Figure 4 Slope diagram of the middle BB direction;

[0022] Figure 7 for Figure 6 Enlarged view of point C in the middle.

[0023] Reference numerals: spinneret 1, spinneret hole 11, blade 111, impregnation tank 2, first roller 21, second roller 21, third roller 23, box 3, mixing assembly 4, cylinder 41, through port 411, central tube 42, discharge hole 421, through hole 422, spiral tube 43, spiral channel 431, stirring blade 44, bucket 45, partition 46, flap 47, hinge 471, cover 472, spring 48, connecting shaft 49. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] A manufacturing process for W-section recycled semi-light fiber includes the following steps:

[0027] (a) Recycled semi-dull PET chips (melting point 261.2℃, viscosity 0.63 Iv dl / η, containing 0.3wt% TiO2 and 0.67wt% DEG) were crystallized and dried using a crystallization drying device. The crystallization temperature of the recycled semi-dull PET chips was 158-160℃, the drying temperature was 160-165℃, the drying air pressure was 0.08 MPa, and the drying time was 8 hours (the drying time is determined according to actual needs, usually 8-11 hours, and the moisture content of the chips after crystallization and drying is below 25 PPM).

[0028] (b) The crystallized and dried recycled semi-dull PET chips were melt-extruded using a screw extruder to obtain a spinning melt. The heating temperatures of the screw extruder in zones one to five were 278°C, 282°C, 288°C, 290°C, and 292°C, respectively. The extrusion pressure of the screw extruder was 14.5 MPa, and the pressure after filtration was 9.4 MPa.

[0029] (c) The spinning melt is transported to the spinning box, metered by a metering pump and then pressed into the spinning assembly for spinning. The resulting nascent fiber bundle is then subjected to post-heating, airless cooling, ring blowing cooling, bundle oiling, pre-networking, stretching and shaping, and winding to obtain W-section regenerated semi-bright fiber.

[0030] like Figure 1As shown, during spinning, the spinneret 1 of the spinning assembly includes inner and outer concentrically distributed spinneret holes 11. The spinneret holes 11 are distributed in three concentric circles: the inner circle spinneret holes 11 are evenly distributed circumferentially in circles with a diameter of 44 mm; the middle circle spinneret holes 11 are evenly distributed circumferentially in circles with a diameter of 44 mm; and the outer circle spinneret holes 11 are evenly distributed circumferentially in circles with a diameter of 64 mm. The inner circle has 20 spinneret holes 11, the middle circle has 24 spinneret holes 11, and the outer circle has 28 spinneret holes 11. Figure 2 As shown, the discharge end cross-section of the spinneret 11 is W-shaped, consisting of four blades 111, with the included angle between two connected blades 111 being 60°. The length a of each blade 111 is 0.28 mm, and the width b is 0.07 mm.

[0031] The spinning temperature is 294.1℃; the metering pump supply is 34g / min; the post-heating temperature is 255℃; the height of the windless zone is 54mm; the air pressure for ring blowing cooling is 50Pa; the oil nozzle height is 1100mm when applying oil to the bundled yarn, the distance between the bundled yarn guide hook and the oil nozzle is 200mm, and the oil concentration is 11wt%; the pre-network pressure is 0.06Mpa; the first drafting roller speed is 2590m / min and the second drafting roller speed is 2600m / min during drafting and setting; the winding speed is 2576m / min and the winding tension is 10cN during winding and forming.

[0032] Example 2

[0033] W-section regenerated semi-dull fibers were prepared according to the method of Example 1, but in step (b), a screw extruder was used to melt-extrude the crystallized and dried regenerated semi-dull PET chips and nano-calcium carbonate to obtain a spinning melt. Nano-calcium carbonate accounted for 4.03% of the mass of the regenerated semi-dull PET chips; and after obtaining the W-section regenerated semi-dull fibers in step (c), the regenerated semi-dull fibers were passed through an impregnation tank 2 containing an acetic acid solution (1 mol / L) at a speed of 50 m / min. The fibers exiting the impregnation tank 2 were dried at 100-105°C to become the final W-section regenerated semi-dull fibers. Figure 3 As shown, a second roller 22 is rotatably installed inside the impregnation tank 2. The second roller 22 is partially immersed in the acetic acid solution. A rotatable first roller 21 and a third roller 23 are respectively installed above the impregnation tank 2. The fiber enters the impregnation tank 2 after passing through the upper end of the first roller 21 and passes through the lower end of the second roller 22. Then it passes through the upper end of the third roller 23 and exits the impregnation tank 2.

[0034] W-section recycled semi-dull fiber is modified with nano-calcium carbonate. When the fiber is treated with acetic acid solution, the nano-calcium carbonate on the fiber surface reacts with acetic acid, making the fiber surface rough, thereby improving the fiber strength and moisture absorption and quick-drying properties.

[0035] Example 3

[0036] W-section regenerated semi-light fibers were prepared according to the method of Example 1, but the crystallization drying device used in Example 1 was replaced with an improved crystallization drying device.

[0037] like Figures 4-7 As shown, the improved crystallization drying device includes a box body 3 and a mixing mechanism horizontally rotatably installed inside the box body 3. The mixing mechanism includes a pair of symmetrically connected mixing components 4. Each mixing component 4 includes a cylinder 41, a transverse central tube 42 open at both ends, a spiral tube 43, multiple stirring blades 44, and a bucket 45. The central tube 42 is partially located inside the cylinder 41, and one end of the central tube 42 is fixed to the inner wall of the cylinder 41 (the central tube 42 and the cylinder 41 are arranged concentrically). The other end of the central tube 42 extends out of the cylinder 41, and multiple discharge holes 421 are opened on the extended part. The two central tubes 42 of the pair of mixing components 4 are connected. The spiral tube 43 is open at both ends and arranged horizontally. The longitudinal section of the spiral tube 43 is a mosquito coil-shaped spiral. A spiral channel 431, with a longitudinal cross-section resembling a mosquito coil, is formed in conjunction with the central tube 42 and the cylinder 41. (Specifically, the two transverse ends of the spiral tube 43 are fixedly connected to the inner walls of both sides of the cylinder 41, the inner end of the spiral tube 43 located at the center ring is fixedly connected to the outer wall of the central tube 42, and the outer end of the spiral tube 43 located at the outer ring is fixedly connected to the annular inner wall of the cylinder 41.) Multiple stirring blades 44 and buckets 45 are connected to the outer wall of the cylinder 41, arranged circumferentially. The inner cavity of the bucket 45 communicates with the spiral channel 431 through a through-hole 411 on the annular wall of the cylinder 41. The central tube 42 communicates with the spiral channel 431 through multiple through-holes 422 on the central tube 42. The through-holes 422 are distributed circumferentially along the central tube 42.

[0038] The mixing component 4 also includes a pair of coupling shafts 49, which are respectively connected to the outer ends of the two cylinders 41 of the coupling shafts 49, and the pair of coupling shafts 49 rotate through the housing 3.

[0039] like Figure 6 , Figure 7 As shown, the bucket 45 has a hollow arc-shaped structure, and one end of the bucket 45 is open in the circumferential direction. The outer top of the opening of the bucket 45 slides against the inner wall of the box 3, which is beneficial for scooping the slices into the bucket 45 during the rotation of the mixing component 4. The through-hole 411 is set on the cylinder 41 away from the opening end of the bucket 45, which facilitates the smooth passage of the slices through the through-hole 411 into the spiral channel 431; the through hole 422 is set near the connection between the spiral tube 43 and the central tube 42. In order to allow the slices to enter the central tube 42 more completely and quickly along the spiral channel 431, the outermost ring of the spiral channel 431 formed by the spiral tube 43 and the wall of the cylinder 41 is separated by a partition 46.

[0040] Furthermore, the central tube 42 is an angled bent tube, with one side of the central tube 42 fixed into the cylinder 41 and the other side extending out of the cylinder 41. This design allows the slices entering the central tube 42 to be discharged more smoothly into the box 3 through the discharge hole 421.

[0041] Furthermore, such as Figure 6 , Figure 7 As shown, the opening 411 is covered by a flip-up cover 47. The cover 47 includes a hinged part 471 and a cover part 472 connected together. The cover 47 is rotatably mounted in the inner cavity of the cylinder 41 via a pin 473. The cover part 472 is attached to the inner wall of the cylinder 41 and covers the opening 411. A spring 48 is fixedly installed inside the bucket 45. One end of the spring 48 is fixedly connected to the bucket 45, and the other end of the spring 48 passes through the opening 411 and is fixedly connected to the cover part 472.

[0042] During crystallization and drying, the chips are loaded into the chamber 3 and circulated hot air is introduced. The mixing component 4 rotates under the drive of a motor, stirring the chips. Simultaneously, as the bucket 45 rotates from top to bottom past the lower part of the chamber 3's inner cavity, the bucket 45 scoops in some chips. During the upward rotation of the bucket 45, the chips inside the bucket 45 enter the spiral channel 431 through the outlet 411. As the mixing component 4 rotates, the chips enter the central tube 42 along the spiral channel 431 and are then discharged into the chamber 3 through the discharge hole 421. Therefore, the chips can fully contact the hot air through the stirring of the mixing component 4, and simultaneously, the chips can fully contact the hot air inside the mixing component 4, especially within the spiral channel 431. The chips also fully contact the hot air as they are discharged radially out of the discharge hole 421. Thus, the mixing component 4 significantly increases the contact time and contact area between the chips and the hot air, greatly improving the crystallization and drying efficiency and effect, thereby enhancing fiber properties.

[0043] When the opening 411 is covered by the flap 47, after the slice is scooped into the bucket 45, during the upward rotation of the bucket 45, the slice falls under the action of gravity and can then break through the flap 47 and enter the spiral channel 431. After the slice has entered, the flap 47 will be restored to cover the opening 411 under the action of the spring 48, so as to prevent the slice in the spiral channel 431 from flowing out through the opening 411 and the bucket 45 to the greatest extent.

[0044] Example 4

[0045] W-section regenerated semi-light fibers were prepared according to the method of Example 1, but the crystallization drying device used in Example 1 was replaced with the improved crystallization drying device in Example 3.

[0046] The performance of the W-section regenerated semi-optical fibers prepared in Examples 1-4 was tested, and the results are shown in Table 1.

[0047] Table 1

[0048]

[0049] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A manufacturing process for W-section recycled semi-light fiber, characterized in that, The recycled semi-dull PET chips after crystallization and drying are melt-extruded using a screw extruder to obtain a spinning melt, wherein the moisture content of the crystallized and dried chips is below 25 PPM; then the melt is transported to the spinning box, metered by a metering pump and pressed into the spinning assembly for spinning, the resulting nascent fiber bundle is subjected to post-heating, airless cooling, ring blowing cooling, bundle oiling, pre-networking, stretching and shaping, and winding to obtain W-section recycled semi-dull fiber; during spinning, the spinneret (1) of the spinning assembly includes spinnerets (11) with concentric inner and outer rings, the discharge end of the spinneret (11) has a W-shaped cross section composed of four leaves (111), the included angle between two connected leaves (111) is 60°; each leaf (111) has a length of 0.28 mm and a width of 0.07 mm; The crystallization drying device includes a box (3) and a mixing mechanism that is horizontally rotatably installed inside the box (3). The mixing mechanism includes a pair of symmetrically connected mixing components (4). The mixing components (4) include a cylinder (41), a horizontally open central tube (42), a spiral tube (43), multiple stirring blades (44), and a bucket (45). The central tube (42) is partially located inside the cylinder (41), and one end of the central tube (42) is fixed to the inner wall of the cylinder (41). The other end of the central tube (42) extends out of the cylinder (41), and multiple discharge holes (421) are provided on the extended part. The two central tubes (42) of the pair of mixing components (4) are connected. The spiral tube (43) is open at both ends and arranged horizontally. The longitudinal section is in the shape of a mosquito coil spiral. The spiral tube (43) cooperates with the central tube (42) and the cylinder (41) to form a spiral channel (431) with a longitudinal section in the shape of a mosquito coil spiral. The outer wall of the cylinder (41) is connected with multiple stirring blades (44) and buckets (45). The multiple stirring blades (44) and buckets (45) are distributed in a circle. The inner cavity of the bucket (45) is connected to the spiral channel (431) through a through opening (411) on the annular wall of the cylinder (41). The central tube (42) is connected to the spiral channel (431) through multiple through holes (422) on the central tube (42). The outermost ring of the spiral channel (431) formed by the spiral tube (43) and the wall of the cylinder (41) is separated by a partition (46). The opening (411) is covered by a flip-up cover (47); the flip-up cover (47) includes a hinged part (471) and a cover part (472) connected together. The flip-up cover (47) is rotatably installed in the inner cavity of the cylinder (41) by a pin (473). The cover part (472) is attached to the inner wall of the cylinder (41) and covers the opening (411); a spring (48) is fixedly installed in the bucket (45). One end of the spring (48) is fixedly connected to the bucket (45), and the other end of the spring (48) passes through the opening (411) and is fixedly connected to the cover part (472).

2. The manufacturing process of a W-section regenerated semi-light fiber according to claim 1, characterized in that, The spinnerets (11) are distributed in three concentric circles, with the inner circle spinnerets (11) being evenly distributed in a circle with a diameter of 44 mm, the middle circle spinnerets (11) being evenly distributed in a circle with a diameter of 44 mm, and the outer circle spinnerets (11) being evenly distributed in a circle with a diameter of 64 mm.

3. The manufacturing process of a W-section regenerated semi-light fiber according to claim 2, characterized in that, The number of spinnerets (11) in the inner ring is 20, the number of spinnerets (11) in the middle ring is 24, and the number of spinnerets (11) in the outer ring is 28.

4. The manufacturing process of a W-section regenerated semi-light fiber according to claim 1, characterized in that, The crystallization temperature of recycled semi-dull PET chips is 158-160℃, the drying temperature is 160-165℃, the drying air pressure is 0.08MPa, and the drying time is 8-11h.

5. The manufacturing process of a W-section regenerated semi-light fiber according to claim 1, characterized in that, The heating temperatures of the screw extruder in zones one through five are 278℃, 282℃, 288℃, 290℃, and 292℃, respectively. The extrusion pressure of the screw extruder is 14.5MPa, and the pressure after filtration is 9.4MPa.

6. The manufacturing process of a W-section regenerated semi-light fiber according to claim 1, characterized in that, The spinning temperature was 294.1℃; the metering pump supply was 34g / min.

7. The manufacturing process of a W-section regenerated semi-light fiber according to claim 1, characterized in that, The post-heating temperature is 255℃; the height of the windless zone is 54mm; the air pressure for the ring-blowing cooling is 50Pa; the height of the oil nozzle when applying oil to the bundle is 1100mm; the distance between the bundle guide hook and the oil nozzle is 200mm; and the oil concentration is 11wt%.

8. The manufacturing process of a W-section regenerated semi-light fiber according to claim 1, characterized in that, The pre-network pressure is 0.06 MPa; during the stretching and shaping process, the first stretching roller speed is 2590 m / min, and the second stretching roller speed is 2600 m / min; during the winding and forming process, the winding speed is 2576 m / min, and the winding tension is 10 cN.

Images