A production method for regenerated fully matte whitening polyester fiber

Abstract

The present invention discloses a method for producing regenerated fully matte whitening polyester fiber. The method comprises the following steps: a two-component automatic batching machine is used to batch regenerated fully matte polyester chips and whitening masterbatch, which are then transported to a masterbatch machine for blending to obtain a premix; the premix is then transported to a screw extruder for melt blending, and the resulting melt is metered by a metering pump and then transported to a spinning manifold for spinning through a spinning assembly. The filaments are then post-heated, side-blown cooled, and bundled and oiled. The fibers are then pre-intertwined, drawn and shaped, subjected to main intertwining, and wound to produce the regenerated fully matte whitening polyester fiber. The present invention improves the surface whiteness difference and color of the fibers, meeting the production needs of products with high whiteness requirements.

Description

Technical Field

[0001] The invention relates to the technical field of spinning, in particular to a production method of regenerated fully matt whitened polyester fiber. Background Art

[0002] Woven products made from high-whiteness polyester fibers can be used directly in products requiring high whiteness without bleaching or whitening treatment. Currently, the whiteness of recycled polyester fibers on the market differs significantly from that of virgin polyester fibers. Improving the whiteness of recycled fibers and increasing the added value of recycled products are essential for the development of recycled polyester fibers. Currently, the most common method is to add whitening masterbatch. However, the whitening masterbatch and polyester chips cannot be evenly dispersed and mixed, which can easily lead to spots on the fiber surface and whiteness differences, affecting product quality. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a method for producing regenerated fully matte whitened polyester fiber, which improves the whiteness difference and color of the fiber surface and meets the production needs of products with higher whiteness requirements.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for producing regenerated fully matt whitening polyester fiber comprises the following steps: mixing regenerated fully matt polyester chips and whitening masterbatches with a two-component automatic batching machine, and then conveying the mixture to a masterbatch machine for blending to obtain a premix; conveying the premix to a screw extruder for melt blending, and metering the obtained melt with a metering pump, and conveying the melt to a spinning manifold for spinning through a spinning assembly; then, the filament bundles are subjected to post-heating, side-blowing cooling, bundling and oiling treatment, and then undergo pre-interlacing, drafting and shaping, main interlacing, and winding to obtain the regenerated fully matt whitening polyester fiber.

[0006] During the batching process, the recycled full-dull polyester chips were crystallized and dried at 155°C and 0.1Mpa drying wind pressure, and the whitening masterbatch was dried at 100°C.

[0007] The addition amount of whitening masterbatch in the premix is 1.8wt%.

[0008] The screw extruder includes a lower hopper, a feeding section and a barrel mechanism 9. The feeding section includes a horizontal circular barrel. The inner cavity of the barrel is provided with a circle of inner push pieces and a circle of outer push pieces distributed in inner and outer circles. The inner push pieces and the outer push pieces are evenly distributed in mutually staggered circles. The inner push pieces and the outer push pieces are both slidably embedded in the barrel. The inner push pieces are driven to rotate by a circle of first electromagnets, and the outer push pieces are driven to rotate in the opposite direction by a circle of second electromagnets. The outlet end of the lower hopper is connected to one side of the barrel up and down, and one side of the barrel is connected to the barrel mechanism 9 up and down.

[0009] The upper and lower ends of each inner push piece and the upper and lower ends of each outer push piece are respectively slidably connected to the upper and lower inner surfaces of the barrel, and the inner side of each inner push piece and the outer side of each outer push piece are embedded with iron sheets. A circle of the first electromagnets is evenly distributed on the inner circle of the barrel and can be rotatably arranged in a circle. The first electromagnets and the iron sheets of the inner push pieces are adsorbed one by one. A circle of the second electromagnets is evenly distributed on the outer circle of the barrel and can be rotatably arranged in a circle. The second electromagnets and the iron sheets of the outer push pieces are adsorbed one by one.

[0010] The inner circle of the barrel is provided with a rotatable inner turntable, and a circle of the first electromagnet is fixedly mounted on the inner turntable. The discharge bin includes a vertical discharge pipe and a discharge pipe connected to the lower end of the discharge pipe. The lower end of the discharge pipe is connected to one side of the barrel. The outer sleeve of the discharge pipe is provided with a rotatable upper turntable. The lower surface of the upper turntable is fixedly connected to the vertical connecting rods distributed in a circle, and the second electromagnet is fixed to the lower part of the connecting rod.

[0011] The temperatures of each section of the screw extruder are: 278°C, 282°C, 284°C, 286°C, 288°C, the extrusion pressure is 11.5MPa, and the pressure after filtration is 9.5MPa.

[0012] The pumping rate of the metering pump is 53.8 g / min; the temperature of the spinning box is controlled at 286.5° C., the post-heating temperature of the spinning assembly is 230° C., and the assembly pressure is 13.5 MPa.

[0013] The side wind speed is 0.58m / s and the temperature is 23°C; the height of the oil nozzle is 1100mm, the distance between the bundled wire hook and the oil nozzle is 200mm, and the concentration ratio of the oil agent is 14wt%.

[0014] The pressure of the pre-network is 0.05MPa; during the drawing and shaping process, the speed of the first drawing roller is 2082m / min, the temperature is 91°C, the speed of the second drawing roller is 2080m / min, the temperature is 91°C, the speed of the third drawing roller is 4902m / min, the temperature is 122°C, and the speed of the fourth drawing roller is 4900m / min; the main network pressure is 0.35MPa; during winding and shaping, the winding speed is 4850m / min and the winding tension is 22cN.

[0015] The beneficial effects of the present invention are as follows: using recycled fully matte polyester chips as raw materials, regenerated fully matte whitened polyester fibers are produced by adding whitening masterbatch, improving the screw extruder and the spinning process, and in particular, by arranging a circle of inner pushing pieces and a circle of outer pushing pieces in the feeding section of the screw extruder to rotate forward and reverse, the whitening masterbatch and the recycled fully matte polyester chips are promoted to be evenly dispersed and mixed in the feeding section, the whiteness difference and color of the fibers are improved, and the regenerated fibers fully reach the whiteness and strength of the original fibers, thus meeting production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the screw extruder of the present invention;

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0019] Figure 4 Schematic diagram of the cross-sectional structure of the feeding section of the screw extruder of the present invention;

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

[0021] In the figure: unloading bin 1, unloading pipe 11, discharging pipe 12, convex ring 13, feeding section 2, barrel 21, inner upper slide rail 211, inner lower slide rail 212, outer upper slide rail 213, outer lower slide rail 214, inner push piece 22, outer push piece 23, iron sheet 24, pipeline 25, first electromagnet 3, second electromagnet 4, first motor 5, inner turntable 6, upper turntable 7, connecting rod 71, ring sleeve 72, thrust ball bearing 73, gear A 74, gear B 75, second motor 8, barrel mechanism 9. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] A production method for regenerated fully matte whitening polyester fiber:

[0024] (a) Add the recycled full-dull polyester chips into a crystallization dryer and perform crystallization drying at 155°C and 0.1 MPa drying air pressure. Add the whitening masterbatch into a masterbatch dryer and dry at 100°C for 24 hours.

[0025] (b) Recycled full-matt polyester chips and whitening masterbatch are batched by a two-component automatic batching machine and then transported to a masterbatch machine for blending to obtain a premix; the amount of whitening masterbatch added to the premix is 1.8 wt%.

[0026] (c) The premix is conveyed to a screw extruder for melt blending, and the temperatures of the various sections of the screw extruder are: 278°C, 282°C, 284°C, 286°C, and 288°C, the extrusion pressure is 11.5 MPa, and the pressure after filtration is 9.5 MPa; the obtained melt is metered by a metering pump and conveyed to a spinning manifold for spinning through a spinning assembly, the pump supply of the metering pump is 53.8 g / min, the temperature of the spinning manifold is controlled at 286.5°C, the post-heating temperature of the spinning assembly is 230°C, and the assembly pressure is 13.5 MPa; thereafter, the filament bundle is subjected to post-heating, side-blowing cooling, and bundling oiling treatment, and then to pre-networking, drawing and shaping, main network, and winding molding to obtain a recycled fully matte whitening polyester. fiber; the side wind speed is 0.58m / s, and the temperature is 23℃; the height of the oil nozzle is 1100mm, the distance between the bundle guide hook and the oil nozzle is 200mm, and the concentration ratio of the oil agent is 14wt%; the pre-network pressure is 0.05MPa; during stretching and shaping, the speed of the first stretching roller is 2082m / min, and the temperature is 91℃, the speed of the second stretching roller is 2080m / min, and the temperature is 91℃, the speed of the third stretching roller is 4902m / min, and the temperature is 122℃, and the speed of the fourth stretching roller is 4900m / min; the main network pressure is 0.35MPa; during winding and forming, the winding speed is 4850m / min and the winding tension is 22cN.

[0027] like Figure 1-5 As shown, the screw extruder includes a lower hopper 1, a feeding section 2 and a barrel mechanism 9, the feeding section 2 includes a horizontal annular barrel 21, the inner cavity of the barrel 21 is provided with a circle of inner push pieces 22 and a circle of outer push pieces 23 distributed in inner and outer circles, a circle of the inner push pieces 22 and a circle of the outer push pieces 23 are evenly distributed in mutually staggered circles, the inner push pieces 22 and the outer push pieces 23 are both slidably embedded in the barrel 21, a circle of the inner push pieces 22 is driven to rotate by a circle of the first electromagnet 3, and a circle of the outer push pieces 23 is driven to rotate in the opposite direction by a circle of the second electromagnet 4, and the rotation direction of the outer push pieces 23 is opposite to that of the inner push pieces 22, the outlet end of the lower hopper 1 is connected to one side of the barrel 21 up and down, and one side of the barrel 21 is connected to the barrel mechanism 9 up and down.

[0028] The upper and lower ends of each inner push piece 22 and the upper and lower ends of each outer push piece 23 are respectively slidably connected to the upper and lower inner surfaces of the barrel 21. Furthermore, the upper inner surface of the barrel 21 is respectively raised to form a circle of inner upper slide rail 211 and a circle of outer upper slide rail 213, and the lower inner surface of the barrel 21 is respectively raised to form a circle of inner lower slide rail 212 and a circle of outer lower slide rail 214. The inner push piece 22 is slidably connected between the inner upper slide rail 211 and the inner lower slide rail 212, and the outer push piece 23 is slidably connected between the outer upper slide rail 213 and the outer lower slide rail 214.

[0029] In the present invention, an outer push piece 23 is provided between the angles of two adjacent inner push pieces 22. If there are six inner push pieces 22 and six outer push pieces 23, then the six inner push pieces 22 are evenly distributed around the inner circumference, and the six outer push pieces 23 are evenly distributed around the outer circumference. The angle between adjacent inner push pieces 22 and outer push pieces 23 is 30 degrees. The longitudinal cross-section of the barrel 21 is square, and the areas of the inner push pieces 22 and outer push pieces 23 are half or less than half of the longitudinal cross-section. The inner vertical wall of the inner push piece 22 slides in contact with the inner vertical wall of the barrel 21, and the outer vertical wall of the outer push piece 23 slides in contact with the outer vertical wall of the barrel 21.

[0030] An iron sheet 24 is embedded in the inner side of each inner push piece 22 and the outer side of each outer push piece 23. A circle of the first electromagnets 3 is evenly distributed on the inner circle of the barrel 21 and can be rotatably arranged in a circle. The first electromagnets 3 and the iron sheets 24 of the inner push pieces 22 are adsorbed to each other in a one-to-one correspondence. A circle of the second electromagnets 4 is evenly distributed on the outer circle of the barrel 21 and can be rotatably arranged in a circle. The second electromagnets 4 and the iron sheets 24 of the outer push pieces 23 are adsorbed to each other in a one-to-one correspondence.

[0031] The inner circle of the barrel 21 is provided with a rotatable inner turntable 6, and the inner turntable 6 is driven to rotate by the first motor 5. The first electromagnet 3 is fixedly mounted on the inner turntable 6 in a circle. The discharge bin 1 includes a vertical discharge pipe 11 and a discharge pipe 12 connected to the lower end of the discharge pipe 11. The lower end of the discharge pipe 12 is connected to one side of the barrel 21. The outer sleeve of the discharge pipe 11 is provided with a rotatable upper turntable 7. The lower surface of the upper turntable 7 is fixedly connected to the circumferentially distributed vertical connecting rods 71, and the second electromagnet 4 is fixed to the lower part of the connecting rod 71.

[0032] The discharge silo 1 is fixedly installed, and a convex ring member 13 is fixedly installed on the outer wall of the discharge pipe 11. The outer ring of the discharge pipe 11 is also sleeved with a ring sleeve 72. The longitudinal section of the ring sleeve 72 is an inverted U-shape. The horizontal part of the ring sleeve 72 is located above the convex ring member 13 and the two are rotatably connected by a thrust ball bearing 73. The vertical part of the ring sleeve 72 is sleeved on the outer ring of the convex ring member 13, and the upper turntable 7 is fixedly sleeved on the vertical part of the ring sleeve 72. The vertical part of the ring sleeve 72 is also fixedly sleeved with an A gear 74. A second motor 8 is fixedly installed on one side of the discharge silo 1, and the shaft of the second motor 8 is engaged with the A gear 74 through the B gear 75.

[0033] The bottom of one side of the barrel 21 is connected to the barrel mechanism 9 through a pipe 25. Valves are provided on the pipe 25 and the discharge pipe 11. The material is heated after entering the barrel 21 through the discharge bin 1. The inner push piece 22 rotates in the opposite direction under the action of the first electromagnet 3 and the outer push piece 23 rotates in the second direction under the action of the second electromagnet 4. A part of the polyester chip melt and the whitening masterbatch are pushed to move by the inner push piece 22, and a part of the polyester chip melt and the whitening masterbatch are pushed to move in the opposite direction by the outer push piece 23. The materials are mixed under the positive and negative pushes, which promotes the uniformity of dispersion of the whitening masterbatch in the polyester chip melt. After that, the material is fed into the barrel mechanism 9, and subsequent operations are carried out through the barrel mechanism 9 (the barrel mechanism 9 includes the remaining structures of the screw extruder except the feeding section) to complete the melt extrusion.

[0034] According to the above example, a conventional screw extruder was used to prepare regenerated, fully matte, whitened polyester fiber (Comparative Example). The properties of the two fibers were tested, and the results are shown in Table 1. It was found that the fiber prepared in the example had properties and whiteness that met the standards for virgin fiber, while the comparative example product had inferior performance compared to the example, and its whiteness also failed to fully meet the standards.

[0035] Table 1

[0036]

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for producing regenerated fully matte whitened polyester fiber, characterized by: The recycled full-dull polyester chips and the whitening masterbatch are mixed by a two-component automatic batching machine, and then transported to a masterbatch machine for blending to obtain a premix; the premix is transported to a screw extruder for melt blending, and the resulting melt is metered by a metering pump and then transported to a spinning manifold for spinning through a spinning assembly, and then the filament bundle is subjected to post-heating, side-blowing cooling, bundling and oiling treatment, and then pre-interlacing, drafting, main interlacing, and winding to obtain recycled full-dull whitening polyester fiber; The screw extruder comprises a lower hopper (1), a feeding section (2) and a barrel mechanism (9), wherein the feeding section (2) comprises a horizontal annular barrel (21), an inner cavity of the barrel (21) is provided with a circle of inner push pieces (22) and a circle of outer push pieces (23) distributed in inner and outer circles, the inner push pieces (22) and the outer push pieces (23) are uniformly distributed in mutually staggered circles, the inner push pieces (22) and the outer push pieces (23) are both slidably embedded in the barrel (21), the inner push pieces (22) are driven to rotate by a circle of first electromagnets (3), and the outer push pieces (23) are driven to rotate in the opposite direction by a circle of second electromagnets (4), the outlet end of the lower hopper (1) is connected to one side of the barrel (21) in upper and lower directions, and the one side of the barrel (21) is connected to the barrel mechanism (9) in upper and lower directions; The upper and lower ends of each inner push piece (22) and the upper and lower ends of each outer push piece (23) are respectively slidably connected to the upper and lower inner surfaces of the barrel (21); the longitudinal cross-section of the barrel (21) is square; the areas of the inner push piece (22) and the outer push piece (23) are half or less than half of the longitudinal cross-section; the inner vertical wall of the inner push piece (22) is slidably fitted with the inner vertical wall of the barrel (21); the outer vertical wall of the outer push piece (23) is slidably fitted with the outer vertical wall of the barrel (21); An iron sheet (24) is embedded in the inner side of each inner push piece (22) and the outer side of each outer push piece (23); a circle of the first electromagnets (3) is evenly distributed on the inner circle of the barrel (21) and can be rotatably arranged in a circle; the first electromagnets (3) and the iron sheets (24) of the inner push pieces (22) are adsorbed one by one; a circle of the second electromagnets (4) is evenly distributed on the outer circle of the barrel (21) and can be rotatably arranged in a circle; the second electromagnets (4) and the iron sheets (24) of the outer push pieces (23) are adsorbed one by one; The inner circle of the barrel (21) is provided with a rotatable inner turntable (6), and a circle of the first electromagnet (3) is fixedly mounted on the inner turntable (6) in a circle. The discharge bin (1) includes a vertical discharge pipe (11) and a discharge pipe (12) connected to the lower end of the discharge pipe (11), and the lower end of the discharge pipe (12) is connected to one side of the barrel (21). The outer shell of the discharge pipe (11) is provided with a rotatable upper turntable (7), and the lower surface of the upper turntable (7) is fixedly connected to the vertical connecting rods (71) distributed in a circle, and the second electromagnet (4) is fixed to the lower part of the connecting rod (71); The outer wall of the discharge tube (11) is fixedly provided with a convex ring member (13), and the outer ring of the discharge tube (11) is also provided with a ring sleeve (72), the longitudinal section of the ring sleeve (72) is inverted U-shaped, the horizontal portion of the ring sleeve (72) is located above the convex ring member (13) and the two are rotatably connected via a thrust ball bearing (73), the vertical portion of the ring sleeve (72) is provided on the outer ring of the convex ring member (13), the upper turntable (7) is fixedly provided on the vertical portion of the ring sleeve (72), and the vertical portion of the ring sleeve (72) is also fixedly provided with an A gear (74), and a second motor (8) is fixedly provided on one side of the discharge bin (1), and the shaft of the second motor (8) is meshed with the A gear (74) via the B gear (75).

2. The method for producing regenerated fully matte whitened polyester fiber according to claim 1, characterized in that: During the batching process, the recycled full-dull polyester chips were crystallized and dried at 155°C and 0.1MPa drying wind pressure, and the whitening masterbatch was dried at 100°C.

3. The method for producing regenerated fully matte whitened polyester fiber according to claim 1, characterized in that: The addition amount of whitening masterbatch in the premix is 1.8wt%.

4. The method for producing regenerated fully matte whitened polyester fiber according to claim 1, wherein: The temperatures of each section of the screw extruder are: 278°C, 282°C, 284°C, 286°C, 288°C, the extrusion pressure is 11.5MPa, and the pressure after filtration is 9.5MPa.

5. The method for producing regenerated fully matte whitened polyester fiber according to claim 1, characterized in that: The pumping rate of the metering pump is 53.8 g / min; the temperature of the spinning box is controlled at 286.5° C., the post-heating temperature of the spinning assembly is 230° C., and the assembly pressure is 13.5 MPa.

6. The method for producing regenerated fully matte whitened polyester fiber according to claim 1, characterized in that: The side wind speed is 0.58m / s and the temperature is 23°C; the height of the oil nozzle is 1100mm, the distance between the bundled wire hook and the oil nozzle is 200mm, and the concentration ratio of the oil agent is 14wt%.

7. The method for producing regenerated fully matte whitened polyester fiber according to claim 1, characterized in that: The pressure of the pre-network is 0.05MPa; during the drawing and shaping process, the speed of the first drawing roller is 2082m / min, the temperature is 91°C, the speed of the second drawing roller is 2080m / min, the temperature is 91°C, the speed of the third drawing roller is 4902m / min, the temperature is 122°C, and the speed of the fourth drawing roller is 4900m / min; the main network pressure is 0.35MPa; during winding and shaping, the winding speed is 4850m / min and the winding tension is 22cN.

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