Special-shaped fiber for making rolled brim hat, spinneret and method for preparing special-shaped fiber

Abstract

The present application discloses a kind of special-shaped fibers of rolled brim straw hat, with the radial section of rolled brim straw hat shape, the radial section includes 2 symmetrically arranged special-shaped units, special-shaped unit includes sequentially connected first circular arc body, flat body and second circular arc body, and 2 first circular arc body is connected, and second circular arc body forms roll edge.The present application further discloses a kind of spinneret for preparing special-shaped fiber, the spinneret has spinneret hole, and the spinneret hole includes 2 symmetrically arranged micro-hole units, micro-hole unit includes sequentially connected first circular arc slit, flat slit and second circular arc slit, and the inner arc surface end of 2 first circular arc slits is respectively inclinedly provided with straight edge, and 2 straight edges are oppositely spaced.The present application further discloses a kind of method for preparing special-shaped fiber.The special-shaped fiber of the present application has good fluffiness, while there is a large amount of static air between adjacent special-shaped fibers, which has good warm-keeping effect and moisture absorption and quick drying function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spinning, in particular to a curled pith helmet profiled fiber, a spinneret and a method for preparing the profiled fiber. BACKGROUND

[0002] Polyester fiber is a basic textile raw material in the textile industry, which has high strength, good stiffness and is easy to maintain, but also has poor moisture absorption, large wearing specific gravity, strong rigidity, poor bulkiness and poor antistatic property. In order to improve the shortcomings of polyester fiber, various modifications have been made to polyester fiber by chemical fiber workers.

[0003] The modification of polyester fiber mainly includes chemical modification and physical modification. The chemical modification mainly adds hydrophilic groups or flexible units to the macromolecular structure of polyester, or adds antistatic, flame-retardant, antibacterial and other components to the polymer. Since the chemical modification increases the "defective factor", the spinnability is poor, so far it has not been completely improved, the production cost is also increased, and the market acceptance needs to consider the performance-price ratio. The physical modification is mainly realized by controlling the cross-section of spinning and forming. At present, various profiled polyester fibers have been developed, such as trilobal, multilobal, triangular, polygonal, cross-shaped, H-shaped, flat-shaped, hollow-shaped, 8-shaped hollow-shaped, irregular hollow-shaped, multi-ring hollow-shaped and the like, showing a situation of a hundred flowers blooming. These profiled fibers have different performance improvements due to their specific shapes, such as trilobal and triangular shapes improving gloss performance, cross and H shapes improving moisture absorption and quick drying performance and standing performance, flat shape resisting bending in the longitudinal direction and being flexible in the transverse direction, hollow shape improving lightweight and moisture absorption and air permeability but being easy to be squeezed, and the like. The gaps between these profiled fibers are small, and they are easy to be squeezed together or the convex and concave edges of the cross-section are engaged together. There is little air between the fibers. At present, there is no profiled fiber with bulkiness and much air, and also with moisture absorption and quick drying function. Therefore, there is an urgent need for a new technical solution to solve at least one of the above problems. SUMMARY

[0004] In view of the above shortcomings, one object of the present application is to provide a curled pith helmet profiled fiber, which cannot be closely close to each other between adjacent profiled fibers, and forms a larger natural gap, has good bulkiness, has a large amount of air between adjacent profiled fibers, has good warmth-keeping effect, and has moisture absorption and quick drying function. Another object of the present application is to provide a spinneret which can be used to prepare profiled fibers. Another object of the present application is to provide a method for preparing profiled fibers, which can prepare profiled fibers with bulkiness, warmth-keeping and moisture absorption and quick drying.

[0005] In order to achieve the above technical purpose and meet the above technical requirements, the technical solution adopted by the present application is:

[0006] The application discloses a special-shaped fiber for a pith helmet, which has a pith helmet-shaped radial section, and the radial section comprises two symmetrically arranged special-shaped units, the special-shaped unit comprises a first circular arc body, a flat body and a second circular arc body which are sequentially connected, the inner arc end of the first circular arc body extends along an inclined straight line, and the two first circular arc bodies are connected, and the second circular arc body forms a pith.

[0007] As a preferred technical scheme, the second circular arc body is semicircular, and the bending directions of the first circular arc body and the second circular arc body are opposite.

[0008] The application further provides a spinneret for preparing the special-shaped fiber, and the spinneret has a spinneret hole, the spinneret hole comprises two symmetrically arranged micro-hole units, the micro-hole unit comprises a first circular arc slit, a flat slit and a second circular arc slit which are sequentially connected, the inner arc end of the two first circular arc slits is respectively provided with a straight edge in an inclined manner, and the two straight edges are oppositely and spaced apart.

[0009] As a preferred technical scheme, the inner diameter of the first circular arc slit is 0.05mm-0.4mm, the width is 0.04mm-0.15mm, and the length of the straight edge is 0.02mm-0.2mm.

[0010] The inner diameter of the second circular arc slit is 0.1mm-0.4mm, and the width is 0.04mm-0.15mm.

[0011] The length of the flat slit is 0.2mm-0.6mm, and the length-width ratio is (3-6):1.

[0012] The distance between the two straight edge ends is 0.02mm-0.2mm, and the included angle formed by the two straight edges is 100°-150°.

[0013] The application further provides a method for preparing the special-shaped fiber, and the method comprises the following steps: using the spinneret, and spraying polyester polymer melt through the spinneret, the polyester polymer melt sprayed through the first circular arc slit is adhered into an integrated whole at the straight edge end due to an expansion effect, and the special-shaped fiber is obtained through a subsequent processing procedure.

[0014] As a preferred technical scheme, the special-shaped fiber is divided into short fibers and long fibers, and the long fibers comprise one of UDY, POY, HOY and FDY.

[0015] As a preferred technical scheme, the specific steps for preparing the short fibers are as follows: polyester polymer melt is subjected to spinning, metering, quenching, oiling, guide, feeding into a falling barrel, bundle-up wire feeding, balancing, drafting, crimping, drying and setting, cutting, and packaging, and the winding speed of the short fibers is 1000-1500m / min.

[0016] The specific steps for preparing the UDY, POY and HOY are as follows: polyester polymer melt is spun, metered, quenched, oiled and wound, the UDY and POY are drawn and texturized by a drawing machine and a drawing and texturing machine after winding, the winding speed of the UDY is 1000-1500 m / min, the winding speed of the POY is 2600-3400 m / min, and the winding speed of the HOY is 5500-6500 m / min.

[0017] The specific steps for preparing the FDY are as follows: polyester polymer melt is spun, metered, quenched, oiled, hot roller drawn and high-speed wound, the first hot roller speed is 1200-2500 m / min, and the temperature is 75-105 DEG C, and the second hot roller speed is 3600-4800 m / min, and the temperature is 80-150 DEG C.

[0018] As a preferred technical solution, the polyester polymer melt enters a spinning assembly provided with the spinneret for spinning.

[0019] The spinning assembly comprises an assembly outer shell, a spinneret, a second distribution plate, a filter container and a gland which are sequentially arranged in the assembly outer shell, the filter container is filled with filter material, a flow guide block is arranged above the filter material, the gland is sealingly buckled with the filter container, a locking device is arranged on the end of the gland away from the filter container, the gland is provided with a feed port penetrating the gland in the axial direction, a sealing nozzle is arranged in the feed port, a first distribution plate is embedded in the bottom of the sand cup, a first filter screen is arranged between the filter sand and the first distribution plate, a second filter screen is arranged between the first distribution plate and the second distribution plate, and a third filter screen is arranged between the second distribution plate and the spinneret.

[0020] As a preferred technical solution, the height of the spinning surface of the spinneret protruding out of the assembly outer shell is 5-25 mm.

[0021] As a preferred technical solution, a component body is arranged below the spinning assembly, a plurality of spinning assembly mounting holes are embedded in the component body, each group of the component body constitutes a spinning position, a red copper plate is attached to the lower surface of the component body, a through hole penetrating the red copper plate in the axial direction is arranged on the red copper plate, the through hole is correspondingly arranged with the spinning assembly mounting hole, the diameter of the through hole is 1-2 mm larger than that of the spinning assembly mounting hole, and the thickness of the red copper plate is 30-60 mm.

[0022] The beneficial effects of the present application are as follows:

[0023] The prepared profiled fiber has good bulkiness, good warm-keeping effect and moisture absorption and quick drying function, is a high-sensitivity fiber with many functions, and effectively improves the shortcomings of polyester fiber. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A structure diagram of profiled fiber provided for an embodiment of the present application is shown in the figure.

[0025] Figure 2 A side view of a spinneret provided for an embodiment of the present application is shown in the figure.

[0026] Figure 3 A partial sectional view of a spinneret provided for an embodiment of the present application is shown in the figure.

[0027] Figure 4 A structure diagram of a spinning hole provided for an embodiment of the present application is shown in the figure.

[0028] Figure 5 A structure diagram of a spinning assembly provided for an embodiment of the present application is shown in the figure.

[0029] Figure 6 A structure diagram of a guide hole body provided for an embodiment of the present application is shown in the figure.

[0030] Figure 7 A cross-sectional view of a fabric woven from the profiled fiber of embodiment 1 is shown in the figure.

[0031] In Figures 1-7 , 1, profiled unit; 101, first circular arc body; 102, flat body; 103, second circular arc body; 2, spinneret; 201, spinning surface; 202, spinning hole; 2021, first circular arc slit; 2022, flat slit; 2023, second circular arc slit; 2024, straight edge; 3, assembly outer body; 4, gland; 401, feeding hole; 5, sand cup; 501, filtering sand; 6, first distribution plate; 7, second distribution plate; 8, locking ring; 9, flow guide block; 10, first filter screen; 11, second filter screen; 12, third filter screen; 13, first sealing gasket; 14, second sealing gasket; 15, sealing nozzle; 16, assembly body; 17, red copper plate; 1701, through hole; 18, spinning assembly mounting hole; 19, heat preservation and insulation body; 20, quenching zone. DETAILED DESCRIPTION

[0032] The present application is further described below in conjunction with the drawings.

[0033] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "top", "bottom", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0034] Please refer to Figures 1-7 An irregular fiber of a rolled brim straw hat is provided in an embodiment of the present application, having a radial cross section, the radial cross section comprising two symmetrically arranged irregular units 1, the irregular unit 1 comprising a first circular arc body 101, a flat body 102 and a second circular arc body 103 connected in sequence, the inner arc surface end of the first circular arc body 101 extending along an inclined straight line, and two first circular arc bodies 101 being connected, the second circular arc body 103 forming a rolled brim.

[0035] Further, the second circular arc body 103 is semicircular in shape, the bending directions of the first circular arc body 101 and the second circular arc body 103 are opposite, the end of the second circular arc body 103 is circular arc-shaped, two flat bodies 102 are arranged in parallel, the connection between the outer arc surfaces of two first circular arc bodies 101 is provided with a recessed circular arc, and the linear connection between the inner arc surfaces of two first circular arc bodies 101 is provided with a recessed circular arc, the recessed circular arc being formed by the bonding of polyester polymer melt due to the swelling effect in the spinning process.

[0036] The existing fiber has a small gap between adjacent fibers after being woven into a fabric, and is easily squeezed together, has little static air between the fibers, has poor fluffiness, and has poor moisture absorption and quick drying properties. The irregular fiber of the present application has a structure similar to a rolled brim straw hat, and after being woven into a fabric, adjacent irregular fibers will not be closely brought together, forming a large natural gap between adjacent irregular fibers, and the rolled brim has a spreading effect, so the irregular fiber has good fluffiness, and there is a large amount of static air between adjacent irregular fibers, which has a good warming effect, and the second circular arc body 103 forms a rolled brim, which also gives the irregular fiber good moisture absorption, so the irregular fiber has moisture absorption and quick drying functions. It can be seen that the irregular fiber of the present application is a high-sensitivity fiber with many functions in one, which can effectively improve the shortcomings of polyester fiber.

[0037] Please refer to Figures 1-7The application further provides a spinneret for preparing the profiled fiber, the spinneret 2 has a spinneret hole 202, the spinneret hole 202 comprises two symmetrically arranged micro-hole units, the micro-hole unit comprises a first circular-arc slit 2021, a flat slit 2022 and a second circular-arc slit 2023 which are sequentially communicated, the inner-arc-end of the two first circular-arc slits 2021 is respectively provided with a straight edge 2024 which is arranged in a slanting manner, the two straight edges 2024 are oppositely arranged, the outer-arc-ends of the two first circular-arc slits 2021 are oppositely arranged, and the end of the straight edge 2024 is aligned with the outer-arc-end of the first circular-arc slit 2021. In order to prepare the profiled fiber, the inner-arc-end of the first circular-arc slit 2021 is provided with the straight edge 2024 along the tangent direction of the inner-arc-end, so that when the polyester polymer melt is spun and formed, the polyester polymer melt will be bonded into one body due to the expansion effect after being sprayed from the two micro-hole units, and the bonding reliability of the polyester polymer melt is better due to the effect of the straight edge 2024, the forming effect is better, and the problem that the polyester polymer melt is not easy to be bonded and formed is solved.

[0038] Specifically, one side of the spinneret 2 is a spinning surface 201, and the other side is a material guiding surface 203, a plurality of material guiding holes 2031 are arranged on the material guiding surface 203, the material guiding holes 2031 extend along the axial direction and are connected with the spinneret hole 202, the spinneret hole 202 is arranged at least in one circle around the center of the spinneret 2, the bending direction of the first circular-arc slit 2021 of each micro-hole unit points to the center of the spinneret 2, the shape of the flat slit 2022 is a flat rectangle, the inner diameter of the first circular-arc slit 2021 is 0.05-0.4 mm, the radial width is 0.04-0.15 mm, the length of the straight edge 2024 is 0.05-0.15 mm, the inner diameter of the second circular-arc slit 2023 is 0.1-0.4 mm, the radial width is 0.04-0.15 mm, the length of the flat slit 2022 is 0.2-0.6 mm, and the length-width ratio is (3-6):1, the distance between the ends of the two straight edges 2024 is 0.02-0.2 mm, that is, the distance between the two first circular-arc slits is 0.02-0.2 mm, the included angle formed by the two straight edges 2024 is 100-150°, the straight edge 2024 is tangent to the inner-arc-end of the first circular-arc slit 2021, the end surfaces of the two first circular-arc slits 2021 are parallel, the end surfaces of the two second circular-arc slits 2023 are perpendicular to the flat slit 2022, the widths of the first circular-arc slit 2021, the flat slit 2022 and the second circular-arc slit 2023 are consistent or approximately consistent, the first circular-arc slit 2021, the flat slit 2022, the second circular-arc slit 2023 and the straight edge 2024 are within the above range, the forming effect of the polyester polymer melt is good, the profiled fiber prepared has good fluffiness, good warmth-keeping effect and moisture absorption and quick-drying function.

[0039] Please refer to Figures 1-7 The present application further provides a method for preparing the profiled fiber, which comprises using the spinneret 2, and polyester polymer melt is sprayed through the spinneret 2, and the polyester polymer melt sprayed through the first circular arc slit 2021 is adhered into one body at the end of the straight edge 2024 due to the bulging effect, and the profiled fiber is obtained through subsequent processing procedures.

[0040] Specifically, the profiled fiber can be divided into short fiber and long fiber according to its length, and the long fiber can be divided into UDY, POY, HOY and FDY according to different raw materials.

[0041] Different preparation methods are selected according to the long fiber and the short fiber, and the specific steps for preparing the short fiber are as follows: polyester polymer melt is spun, metered, quenched, oiled, guided, fed into a bucket, bundled, balanced, drawn, crimped, dried and shaped, cut and packaged, and the winding speed of the short fiber is 1000-1500 m / min.

[0042] The specific steps for preparing the UDY, POY and HOY are as follows: polyester polymer melt is spun, metered, quenched, oiled and wound, and the UDY and POY are drawn and elasticized after winding through a drawing machine and an elasticizing machine, the winding speed of the UDY is 1000-1500 m / min, the winding speed of the POY is 2600-3400 m / min, and the winding speed of the HOY is 5500-6500 m / min.

[0043] The specific steps for preparing the FDY are as follows: polyester polymer melt is spun, metered, quenched, oiled, hot-roller drawn and high-speed wound, and the first hot roller is passed first in the hot-roller drawing process, and then the second hot roller is passed, the speed of the first hot roller is 1200-2500 m / min, and the temperature is 75-105℃, the speed of the second hot roller is 3600-4800 m / min, and the temperature is 80-150℃.

[0044] For long filament fibers of the same specification (both the fineness and the number of filaments are the same), if the diameter of the circular cross section of the conventional long filament fiber is d, then the equivalent cross section outer diameter of the same specification of the rolled edge grass hat profiled fiber is 1.2d-4d (the equivalent diameter d is equal to four times the profiled cross section perimeter divided by the profiled cross section area).

[0045] The spinning step of the polyester polymer melt is carried out in a spinning assembly provided with the spinneret 2, which comprises an assembly outer housing 3, the spinneret 2, a second distribution plate 7, a filter container and a gland 4 installed in the assembly outer housing 3 in sequence, the filter container is a sand cup 5, the sand cup 5 is filled with filter material, the filter material is filter sand, a flow guide block 9 is arranged above the filter sand, the gland 4 is sealingly buckled with the sand cup 5, a locking ring 8 is sleeved on the end of the gland 4 away from the sand cup 5, the gland 4 is provided with a feed port penetrating it in the axial direction, a sealing nozzle 15 is arranged in the feed port, a first distribution plate 6 is embedded in the bottom of the sand cup 5, a first filter screen 10 is arranged between the filter sand 501 and the first distribution plate 6, a second filter screen 11 is arranged between the first distribution plate 6 and the second distribution plate 7, a third filter screen 12 is arranged between the second distribution plate 7 and the spinneret 2, the gland 4 is sleeved with a first sealing gasket 13, the locking ring 8 presses the first sealing gasket 13, and the second sealing gasket 14 is embedded in the inner wall of the gland 4 and the sand cup 5 to ensure the sealing performance of the spinning assembly. Specifically, the first filter screen 10 is a three-layer aluminum-edged stainless steel filter screen, the filter sand is selected from 20-100 mesh stainless steel sintered metal sand, a 100 mesh single-layer stainless steel filter screen is laid on the upper layer of the stainless steel sintered metal sand, the third filter screen 12 is a five-layer aluminum-edged stainless steel filter screen, and the second filter screen 11 is a three-layer aluminum-edged stainless steel filter screen. The spinning assembly is preheated by a preheating furnace and then installed on the spinning box body for spinning.

[0046] The polyester polymer melt enters the interior from the feed hole 401, flows into the filter sand 501 through the flow guide block 9 for filtration, then enters the first distribution plate 6 for the first distribution after being filtered through the first filter screen 10, then enters the second distribution plate 7 for the second distribution after being filtered through the second filter screen 11, and finally enters the spinneret 2 through the third filter screen 12.

[0047] Specifically, the spinneret face 201 of the spinneret 2 protrudes by 5-25 mm, and the protruding of the spinneret face 201 of the spinneret 2 out of the assembly outer housing 3 can locally cool the polyester polymer melt before it is ejected from the spinneret 2, increase the melt swelling effect, and be conducive to the polyester polymer melt of the left and right micro-hole units to be bonded into a structure similar to a rolled brim sun hat at the top.

[0048] As Figure 7As shown, the assembly outer shell 3 is provided below with an assembly body 16, which is provided with a plurality of axially embedded spinning assembly mounting holes 18, the lower surface of the spinning assembly mounting hole 18 is closely attached to a red copper plate 17, the red copper plate 17 is correspondingly provided with a plurality of through holes 1701 which are penetrated along the axial direction, the through holes 1701 are correspondingly provided with the spinning assembly mounting hole 18, the diameter of the through hole 1701 is 1mm-2mm larger than the diameter of the spinning assembly mounting hole 18, and the height of the red copper plate 17 is 30mm-60mm. The spinneret plate 2 slightly protrudes from the lower surface of the assembly outer shell 3, and the protruding height is 1mm-2mm, which can effectively control the spinning tensile deformation temperature gradient difference, increase the ability of the red copper plate 17 to prevent excessive cooling from causing poor spinnability, and further improve the heat preservation effect of the high-temperature windless zone by providing a heat preservation insulation body 19 around the assembly body 16. When replacing conventional fiber spinning, only the assembly outer shell 3 needs to be replaced, and the second distribution plate 7 inside the assembly is removed to realize flexible spinning.

[0049] Further, the length of the high-temperature windless zone of the present application is relatively short, and then quickly passes through the quenching zone 20. The red copper plate 17 of a certain thickness is arranged below the assembly outer shell 3 to form a high-temperature windless zone, and the quenching zone 20 uses ring blowing to ensure the profile degree of the profiled fiber, and the specific shape of the red copper plate 17 is determined according to the site production conditions such as the inlet of ring blowing, and will not be described in detail.

[0050] Embodiment 1

[0051] A kind of profiled fiber of rolled brim straw hat, with radial section, the radial section includes 2 symmetrically arranged profiled units 1, the profiled unit 1 includes sequentially connected first circular arc body 101, flat body 102 and second circular arc body 103, the inner arc surface end of the first circular arc body 101 extends along inclined straight line, 2 the first circular arc body 101 is connected, the second circular arc body 103 forms rolled brim, the shape of the second circular arc body 103 is semicircular, the bending direction of the first circular arc body 101 and second circular arc body 103 is opposite, the end of the second circular arc body 103 is circular arc, 2 The flat body 102 is arranged in parallel, the outer arc surface connection of 2 first circular arc body 101 is provided with recessed circular arc, the inner arc surface end of 2 first circular arc body 101 is provided with recessed circular arc at straight line connection.

[0052] A spinneret for preparing the profiled fiber, the spinneret 2 has a spinneret hole 202, the spinneret hole 202 comprises two symmetrically arranged micro-hole units, the micro-hole unit comprises a first circular-arc slit 2021, a flat slit 2022 and a second circular-arc slit 2023 which are sequentially communicated, the inner arc surface end of the first circular-arc slit 2021 is provided with a straight edge 2024 along the tangent direction thereof, two straight edges 2024 are oppositely spaced, the end surface of the first circular-arc slit 2021 is parallel to the inner wall of the flat slit 2022, the spinneret hole 202 is arranged around the center of the spinneret 2, the bending direction of the first circular-arc slit 2021 of each micro-hole unit points to the center of the spinneret 2, the shape of the flat slit 2022 is a flat rectangle, two flat slits 2022 are arranged in parallel, the inner diameter of the first circular-arc slit 2021 is 0.12 mm, the radial width is 0.07 mm, the length of the straight edge 2024 is 0.08 mm, the inner diameter of the second circular-arc slit 2023 is 0.15 mm, the radial width is 0.07 mm, the length of the flat slit 2022 is 0.35 mm, the width is 0.07 mm, the distance between the ends of two straight edges 2024 is 0.07 mm, the included angle formed by two straight edges 2024 is 130°, the number of spinneret holes 202 is 72, which are arranged in the form of three concentric circles on the spinning surface 201 of the spinneret 2.

[0053] A method for preparing a profiled fiber, the profiled fiber is FDY, the specific steps for preparing the FDY are as follows: polyester polymer melt spinning, metering, quenching, oiling, hot roller drafting, high-speed winding to obtain the FDY, the first hot roller speed is 1650 m / min, the temperature is 85℃, the second hot roller speed is 4200 m / min, the temperature is 130℃.

[0054] The polyester polymer melt enters a spinning assembly equipped with the spinneret 2 for spinning, the spinning assembly comprises an assembly outer casing 3, a spinneret 2, a second distribution plate 7, a sand cup 5 filled with filter sand, a guide block 9 arranged above the filter sand, a gland 4 sealingly engaged with the sand cup 5, a locking ring 8 arranged on the end of the gland 4 away from the sand cup 5, the gland 4 is provided with a feed port penetrating the gland 4 in the axial direction, the feed port is provided with a sealing nozzle 15, the bottom of the sand cup 5 is embedded with a first distribution plate 6, a first filter screen 10 is arranged between the filter sand 501 and the first distribution plate 6, a second filter screen 11 is arranged between the first distribution plate 6 and the second distribution plate 7, a third filter screen 12 is arranged between the second distribution plate 7 and the spinneret 2, the gland 4 is sleeved with a first sealing gasket 13, the locking ring 8 presses the first sealing gasket 13, the second sealing gasket 14 is embedded between the inner wall of the gland 4 and the sand cup 5, the first filter screen 10 is a three-layer aluminum-edged stainless steel filter screen, the filter sand is selected from 20-100 mesh stainless steel sintered metal sand, a 100 mesh single-layer stainless steel filter screen is laid on the upper layer of the stainless steel sintered metal sand, the third filter screen 12 is a five-layer aluminum-edged stainless steel filter screen, the second filter screen 11 is a three-layer aluminum-edged stainless steel filter screen, the height of the spinneret face 201 of the spinneret 2 protruding out of the assembly outer casing 3 is 16 mm, an assembly body 16 is arranged below the assembly outer casing 3, the assembly body 16 is provided with a plurality of spinning assembly mounting holes 18 embedded in the axial direction, a purple copper plate 17 is closely attached to the lower surface of the spinning assembly mounting hole 18, a plurality of through holes 1701 penetrating the purple copper plate 17 in the axial direction are arranged on the purple copper plate 17, the through holes 1701 are arranged corresponding to the spinning assembly mounting hole 18, the diameter of the through holes 1701 is 1 mm larger than the diameter of the spinning assembly mounting hole 18, and the height of the purple copper plate 17 is 35 mm.

[0055] Example 2

[0056] A crimped straw hat profiled fiber has a radial cross section, the radial cross section comprises two symmetrically arranged profiled units 1, the profiled unit 1 comprises a first circular arc body 101, a flat body 102 and a second circular arc body 103 connected in sequence, the inner arc surface end of the first circular arc body 101 extends along an inclined straight line, two first circular arc bodies 101 are connected, the second circular arc body 103 forms a crimp, the shape of the second circular arc body 103 is semicircular, the bending directions of the first circular arc body 101 and the second circular arc body 103 are opposite, the end of the second circular arc body 103 is circular arc-shaped, two flat bodies 102 are arranged in parallel, a concave arc is arranged at the connection of the outer arc surfaces of two first circular arc bodies 101, and a concave arc is arranged at the straight line connection of the inner arc surface ends of two first circular arc bodies 101.

[0057] A spinneret for preparing a profiled fiber, the first circular arc slit 2021 has an inner diameter of 0.2 mm and a radial width of 0.05 mm, the straight edge 2024 has a length of 0.07 mm, the second circular arc slit 2023 has an inner diameter of 0.2 mm and a radial width of 0.05 mm, the flat slit 2022 has a length of 0.3 mm and a width of 0.05 mm, the distance between the two ends of the straight edge 2024 is 0.06 mm, and the included angle formed by the two straight edges 2024 is 138°, the number of spinneret holes 202 is 48, arranged in three concentric circles on the spinneret surface 201 of the spinneret 2, and the rest is the same as in example 1.

[0058] A method for preparing a profiled fiber, the profiled fiber is POY, and the specific steps for preparing the POY are as follows: the polyester polymer melt is spun, metered, quenched, oiled, wound, and drawn to obtain POY, and the winding speed of the POY is 2950 m / min.

[0059] The polyester polymer melt enters a spinning assembly provided with the spinneret 2 for spinning, the spinning assembly comprises an assembly outer shell 3, a spinneret 2, a second distribution plate 7, a sand cup 5, and a gland 4 installed in the assembly outer shell 3 in sequence, the sand cup 5 is filled with filtering sand, a flow guide block 9 is arranged above the filtering sand, the gland 4 is sealingly buckled with the sand cup 5, a locking ring 8 is sleeved on the end of the gland 4 away from the sand cup 5, the gland 4 is provided with a feed port penetrating it in the axial direction, a sealing nozzle 15 is arranged in the feed port, a first distribution plate 6 is embedded at the bottom of the sand cup 5, a first filter screen 10 is arranged between the filtering sand 501 and the first distribution plate 6, a second filter screen 11 is arranged between the first distribution plate 6 and the second distribution plate 7, a third filter screen 12 is arranged between the second distribution plate 7 and the spinneret 2, the gland 4 is sleeved with a first sealing gasket 13, the locking ring 8 presses the first sealing gasket 13, the gland 4 and the sand cup 5 are embedded with a second sealing gasket 14, the first filter screen 10 is a three-layer aluminum-edged stainless steel filter screen, the filtering sand is selected from 20-100 mesh stainless steel sintered metal sand, a 100 mesh single-layer stainless steel filter screen is laid on the upper layer of the stainless steel sintered metal sand, the third filter screen 12 is a five-layer aluminum-edged stainless steel filter screen, the second filter screen 11 is a three-layer aluminum-edged stainless steel filter screen, the height of the spinneret surface 201 of the spinneret 2 protruding out of the assembly outer shell 3 is 20 mm, an assembly body 16 is arranged below the assembly outer shell 3, the assembly body 16 is provided with a plurality of spinning assembly mounting holes 18 embedded in the axial direction, a red copper plate 17 is closely attached to the lower surface of the spinning assembly mounting hole 18, a plurality of through holes 1701 penetrating the red copper plate 17 in the axial direction are arranged on the red copper plate 17, the through holes 1701 are arranged corresponding to the spinning assembly mounting holes 18, the diameter of the through holes 1701 is 2 mm larger than the diameter of the spinning assembly mounting holes 18, and the height of the red copper plate 17 is 30 mm.

[0060] Example 3

[0061] A kind of straw hat crimping special-shaped fiber, with radial section, the radial section includes 2 symmetrically arranged special-shaped unit 1, the special-shaped unit 1 includes sequentially connected first circular arc body 101, flat body 102 and second circular arc body 103, the inner arc surface end of the first circular arc body 101 extends along inclined straight line, 2 the first circular arc body 101 is connected, the second circular arc body 103 forms crimping, the shape of the second circular arc body 103 is semicircular, the bending direction of the first circular arc body 101 and second circular arc body 103 is opposite, the end of the second circular arc body 103 is circular arc, 2 The flat body 102 is arranged in parallel, the outer arc surface junction of two first circular arc bodies 101 is provided with recessed circular arc, the inner arc surface end of two first circular arc bodies 101 is provided with recessed circular arc.

[0062] A spinneret for preparing special-shaped fiber, the inner diameter of first circular arc slit 2021 is 0.18mm, the radial width is 0.05mm, the length of straight edge 2024 is 0.05mm, the inner diameter of second circular arc slit 2023 is 0.11mm, the radial width is 0.05mm, the length of flat slit 2022 is 0.2mm, the width is 0.05mm, the distance between the end of two straight edges 2024 is 0.05mm, the included angle formed by two straight edges 2024 is 145 °, the number of spinneret hole 202 is 36, arranged in the spinneret surface 201 of spinneret 2 in the form of two concentric circles, the rest is same with example 1.

[0063] A method for preparing special-shaped fiber, the special-shaped fiber is HOY, the specific steps for preparing the HOY are as follows: polyester polymer melt is spun, metered, quenched, oiled and wound to obtain HOY, and the winding speed of the HOY is 5500m / min.

[0064] The polyester polymer melt enters a spinning assembly provided with the spinneret 2 for spinning, the spinning assembly comprises an assembly outer housing 3, a spinneret 2, a second distribution plate 7, a sand cup 5 filled with filter sand, a guide block 9 arranged above the filter sand, a gland 4 sealingly engaged with the sand cup 5, a locking ring 8 arranged on an end of the gland 4 away from the sand cup 5, the gland 4 is provided with a feed port penetrating the gland 4 in the axial direction, the feed port is provided with a sealing nozzle 15, the sand cup 5 is embedded with a first distribution plate 6 at the bottom, a first filter screen 10 is arranged between the filter sand 501 and the first distribution plate 6, a second filter screen 11 is arranged between the first distribution plate 6 and the second distribution plate 7, a third filter screen 12 is arranged between the second distribution plate 7 and the spinneret 2, the gland 4 is sleeved with a first sealing gasket 13, the locking ring 8 presses the first sealing gasket 13, the gland 4 and the sand cup 5 are embedded with a second sealing gasket 14, the first filter screen 10 is a three-layer aluminum-edged stainless steel filter screen, the filter sand is selected from 20-100 mesh stainless steel sintered metal sand, a 100 mesh single-layer stainless steel filter screen is laid on the upper layer of the stainless steel sintered metal sand, the third filter screen 12 is a five-layer aluminum-edged stainless steel filter screen, the second filter screen 11 is a three-layer aluminum-edged stainless steel filter screen, the spinneret face 201 of the spinneret 2 protrudes from the height of the assembly outer housing 3 by 25 mm, an assembly body 16 is arranged below the assembly outer housing 3, the assembly body 16 is provided with a plurality of spinning assembly mounting holes 18 embedded in the axial direction, a red copper plate 17 is closely attached to the lower surface of the spinning assembly mounting hole 18, a plurality of through holes 1701 penetrating the red copper plate 17 in the axial direction are arranged on the red copper plate 17, the through holes 1701 are arranged corresponding to the spinning assembly mounting holes 18, the diameter of the through holes 1701 is 1.5 mm larger than the diameter of the spinning assembly mounting holes 18, and the height of the red copper plate 17 is 35 mm.

[0065] The shaped fibers prepared in Examples 1, 2 and 3 were subjected to weaving performance tests, and the test data are shown in Table 1.

[0066] Table 1

[0067]

[0068] As can be seen from the test data in Table 1, the shaped fibers prepared in Examples 1, 2 and 3 have good breaking strength, the moisture absorption and quick drying performance is significantly improved while the mechanical properties of the shaped fibers are ensured, the heat preservation effect is good, and the woven fabric has obvious fluffiness.

[0069] It is worth noting that the POY of Example 2 needs to be elasticized for weaving, and the specification is 270 dtex / 48 f before elasticization and 167 dtex / 48 f after elasticization.

[0070] Any numerical values recited herein include all values from the lower value and up to the upper value in increments of one unit provided that the lower value is appropriately provided in the lower value and there are at least two units between any lower value and any higher value. In this manner, a numerical range of "from X to Y" when X and Y are numerical values includes X and Y and all of the intervening values. For example, a range from 1 to 90 also specifically includes 15, 22, 33, 45, 59, 68, 75, 87, 43, 31, 41, 51, and 67, as well as 1 and 90. For values which are less than one, one unit is considered to be 0.0001, 0.001, 0.01, 0.1, or 1, as appropriate. These are only examples of what is specifically intended and all possible combinations of numerical values between the lowest value and the highest value enumerated, are to be considered to be expressly stated in this application.

[0071] Unless otherwise stated, all ranges include both the endpoints and all the numbers between the endpoints. "Approximately" or "about" as applied to any numerical value means + / - 10% of the numerical value, unless otherwise indicated. "Approximately" or "about" as applied to a range means that the range is between the stated lower value and upper value, inclusive of the endpoints.

[0072] All articles and references, including patent applications and publications, disclosed below are incorporated herein by reference for all purposes. The term "consisting essentially of to describe combinations shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combinations. The use of the terms "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps are optional in the described embodiments. The term "may" is intended to mean one or more possible values of a described attribute.

[0073] Plural elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate plural elements, ingredients, components or steps. To "comprise" or "comprising" an element or a list of elements is intended to mean that the element or list of elements can be present, but is not limited to, the elements recited. To "consist essentially of or "consisting essentially of means that the procedure, composition or method can include additional steps, ingredients, components or steps, but essentially only the those that are named.

[0074] The foregoing embodiments are merely exemplary and are not intended to limit the application in any respect. Various modifications can be made to the foregoing embodiments by those skilled in the art without departing from the scope of the present application.

Claims

1. A method for preparing irregularly shaped fibers for rolled-up straw hats, characterized in that, The shaped fiber of the rolled-edge straw hat has a radial cross-section in the shape of a rolled-edge straw hat. The radial cross-section includes two symmetrically arranged shaped units. Each shaped unit includes a first arc body, a flat body, and a second arc body connected in sequence. The inner arc surface of the first arc body extends along an inclined straight line, and two first arc bodies are connected. The second arc body forms a rolled edge. The shape of the second arc body is semi-circular, and the bending directions of the first and second arc bodies are opposite. The method includes using a spinneret having spinneret orifices, each orifice comprising two symmetrically arranged micro-orifice units. Each micro-orifice unit includes a first arcuate slit, a flat slit, and a second arcuate slit connected in sequence. The inner arc surfaces of the two first arcuate slits are respectively provided with straight edges at an incline, and the two straight edges are arranged at intervals relative to each other. The inner diameter of the first arcuate slit is 0.05mm-0.4mm, the width is 0.04mm-0.15mm, and the length of the straight edge is 0.02mm-0.2mm. The inner diameter of the second arc-shaped slit is 0.1mm-0.4mm, and the width is 0.04mm-0.15mm; The length of the flat slit is 0.2mm-0.6mm, and the length-to-width ratio is (3-6):1; The distance between the ends of the two straight edges is 0.02mm-0.2mm, and the included angle formed by the two straight edges is 100°-150°; The polyester polymer melt is ejected through the spinneret. The polyester polymer melt ejected from the first arc slit adheres to the straight edge end due to the expansion effect, and the shaped fiber is obtained through subsequent processing.

2. The method for preparing irregularly shaped fibers for rolled-up straw hats according to claim 1, characterized in that, The irregularly shaped fibers are divided into short fibers and long fibers, and the long fibers include one of UDY, POY, HOY and FDY.

3. The method for preparing irregularly shaped fibers for rolled-up straw hats according to claim 2, characterized in that, The specific steps for preparing the short fibers are as follows: the polyester polymer melt is spun, metered, quenched, oiled, guided, fed into the drum, bundled and loaded, balanced, drawn, crimped, dried and shaped, cut and packaged. The winding speed of the short fibers is 1000-1500m / min. The specific steps for preparing the UDY, POY, and HOY are as follows: the polyester polymer melt is spun, metered, quenched, oiled, and wound. After winding, the UDY and POY are stretched and texturized by a stretching machine and a stretching and texturing machine. The winding speed of the UDY is 1000-1500 m / min, the winding speed of the POY is 2600-3400 m / min, and the winding speed of the HOY is 5500-6500 m / min. The specific steps for preparing the FDY are as follows: polyester polymer melt spinning, metering, quenching, oiling, hot roller drawing, and high-speed winding. The speed of the first hot roller is 1200-2500 m / min, and its temperature is 75℃-105℃. The speed of the second hot roller is 3600-4800 m / min, and its temperature is 80℃-150℃.

4. The method for preparing irregularly shaped fibers for rolled-up straw hats according to claim 3, characterized in that, The polyester polymer melt enters a spinning assembly equipped with the spinneret for spinning. The spinning assembly includes an outer shell, a spinneret, a second distribution plate, a filter container, and a pressure cap, which are sequentially installed within the outer shell. The filter container is filled with filter material, and a flow guide block is provided above the filter material. The pressure cap is sealed and fastened to the filter container. A locking device is fitted onto the end of the pressure cap away from the filter container. The pressure cap has an axially penetrating inlet, and a sealing nozzle is provided inside the inlet. A first distribution plate is embedded at the bottom of the filter container. A first filter screen is provided between the filter material and the first distribution plate. A second filter screen is provided between the first distribution plate and the second distribution plate. A third filter screen is provided between the second distribution plate and the spinneret.

5. The method for preparing irregularly shaped fibers for rolled-up straw hats according to claim 4, characterized in that, The spinneret's spinneret protrudes 5mm-25mm above the component's outer casing.

6. The method for preparing irregularly shaped fibers for rolled-up straw hats according to claim 5, characterized in that, Below the spinning assembly is an assembly body, which is embedded with multiple sets of spinning assembly mounting holes. Each set of the assembly body constitutes one spinning position. A copper plate is attached to the lower surface of the assembly body. The copper plate has a through hole that runs through it along the axial direction. The through hole corresponds to the spinning assembly mounting hole. The diameter of the through hole is 1mm-2mm larger than the diameter of the spinning assembly mounting hole. The thickness of the copper plate is 30-60mm.

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