Multistage spinneret plate

Abstract

The utility model provides a multistage spinneret plate, which relates to the field of monofilaments and comprises a spinneret plate main body, a plurality of flow guide holes are formed in the spinneret plate main body; the flow guide holes sequentially comprise a first guide hole, a second guide hole and a third guide hole from top to bottom, and the hole diameters are sequentially reduced; a first connecting hole and a second connecting hole which are used for connecting the guide holes are respectively formed between the first guide hole and the second guide hole and between the second guide hole and the third guide hole; the cross sections of the first connecting hole and the second connecting hole are gradually reduced from top to bottom; a plurality of protruding parts are arranged on the side wall of the first guide hole. The side wall of the second guide hole is roughly arranged; and the side wall of the third guide hole is smooth. The multi-stage spinneret plate provided by the utility model can solve the problem that the manufacturing cost of the spinneret plate is increased due to the fact that thicker metal materials need to be used in order to reduce the stress when a melt is sprayed out in the prior art, and the purposes of reducing the stress when the melt is sprayed out and reducing the manufacturing cost of the spinneret plate are achieved.

Description

Technical Field

[0001] This utility model relates to the field of monofilament, and more particularly to a multi-stage spinneret. Background Technology

[0002] Spinnerets are used to transform viscous polymer melts into fine streams with specific cross-sectional shapes through micropores. For example, Chinese patent application No. 201320243960.1 discloses a spinneret, which includes a spinneret body with spinneret holes in the body. The spinneret holes have an aspect ratio of 3.5. The spinneret body is divided into two regions, and the spinneret holes in each region are arranged in a semi-circular pattern. The above patent reduces the stress when the melt is ejected by setting the aspect ratio.

[0003] When using the spinneret provided by the above patent, if it is necessary to further reduce the stress when the melt is ejected, the length-to-diameter ratio needs to be further increased. However, if the orifice diameter is too small, the melt cannot be smoothly extruded from the orifice, so the depth of the orifice needs to be increased. However, increasing the depth of the orifice requires the use of thicker metal material, which increases the manufacturing cost of the spinneret. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a multi-stage spinneret that solves the problem that existing technologies require the use of thicker metal materials to reduce the stress during molten material ejection, thereby increasing the manufacturing cost of the spinneret. This invention achieves both reduced stress during molten material ejection and lower manufacturing costs of the spinneret.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a multi-stage spinneret, which includes a spinneret body; the spinneret body has a plurality of guide holes extending from the top to the bottom; the guide holes include a first guide hole, a second guide hole and a third guide hole;

[0007] The first guide hole, the second guide hole, and the third guide hole are all vertically arranged; the first guide hole is located above the second guide hole; the second guide hole is located above the third guide hole; the axes of the first guide hole, the second guide hole, and the third guide hole coincide; the diameter of the first guide hole is larger than the diameter of the second guide hole; the diameter of the second guide hole is larger than the diameter of the third guide hole; the first guide hole, the second guide hole, and the third guide hole are connected.

[0008] The first guide hole has a plurality of protrusions on its sidewall; all the protrusions are evenly distributed on the sidewall of the first guide hole; the sidewall of the second guide hole is rough; the sidewall of the third guide hole is smooth.

[0009] A first connecting hole is provided between the first guide hole and the second guide hole; a second connecting hole is provided between the second guide hole and the third guide hole;

[0010] The first connecting hole and the second connecting hole are funnel-shaped; the top cross-section of the first connecting hole and the second connecting hole is larger than the bottom cross-section; the cross-section of the first connecting hole and the second connecting hole gradually decreases from the top to the bottom; the top of the first connecting hole is connected to and communicates with the bottom of the first guide hole; the bottom of the first connecting hole is connected to and communicates with the top of the second guide hole; the top of the second connecting hole is connected to and communicates with the bottom of the second guide hole; the bottom of the second connecting hole is connected to and communicates with the top of the third guide hole.

[0011] The top opening diameter of the first connecting hole is the same as the bottom diameter of the first guide hole; the bottom opening diameter of the first connecting hole is the same as the top diameter of the second guide hole; the top opening diameter of the second connecting hole is the same as the bottom diameter of the second guide hole; and the bottom opening diameter of the second connecting hole is the same as the top diameter of the third guide hole.

[0012] The multi-stage spinneret provided by this utility model preferably includes a temperature control component; the temperature control component includes a temperature conductor, several fixing rods, several clamping components, a first temperature sensor and a second temperature sensor.

[0013] The spinneret body has a circular cross-section; all the guide holes are arranged in a circular array with the center of the spinneret body as the center.

[0014] The temperature-conducting component is annular; the spinneret body is located inside the inner circle of the temperature-conducting component; the center of the spinneret body coincides with the center of the temperature-conducting component; a ventilation channel is formed between the spinneret body and the temperature-conducting component;

[0015] The temperature-conducting component has several fixing holes from its outer circle to its inner circle; the fixing holes connect the outer circle space and the inner circle space of the temperature-conducting component; the fixing rods are sleeved in the fixing holes; the fixing rods all face the center of the temperature-conducting component; all the fixing rods are arranged in a circumferential array with the center of the temperature-conducting component as the center.

[0016] The clamping member includes an arc-shaped curved panel and an insert; the arc-shaped curved panel is vertically arranged; one of the inserts is fixed to the concave side of one of the arc-shaped curved panels; the end of the fixing rod facing the spinneret body is fixed to the convex side of the arc-shaped curved panel;

[0017] The spinneret body has several slots on its arc-shaped sidewall; all the slots are arranged in a circular array with the center of the spinneret body as the center; one insert corresponds to one slot; the insert is embedded in the slot; the concave side of the arc-shaped panel is in close contact with the arc-shaped sidewall of the spinneret body; a heating coil is provided inside the temperature-conducting component.

[0018] The first temperature sensor is fixed to the arc-shaped sidewall of the spinneret body; the second temperature sensor is fixed to the temperature-conducting component.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] The multi-stage spinneret provided by this utility model allows the molten material to sequentially pass through a first guide hole, a second guide hole, and a third guide hole on the spinneret body. The molten material enters from the larger-diameter first guide hole into the smaller-diameter second guide hole, and then from the second guide hole into the even smaller-diameter third guide hole. The diameter of the guide holes decreases through multiple stages, increasing the aspect ratio by combining the first, second, and third guide holes. This prolongs the flow time of the molten material within the guide holes, guiding the molten material to gradually adapt to shear stress during flow, thereby reducing stress concentration during molten material ejection, suppressing the expansion phenomenon caused by the elastic recovery of the molten material, and thus improving the roundness of the formed monofilament. Furthermore, when the molten material enters the second guide hole from the first guide hole, it passes through... As the melt flows from the second guide hole into the third guide hole via the first connecting hole, the flow velocity distribution of the melt within the guide hole becomes more uniform through the two gradually decreasing diameter connecting holes. This avoids the problem of uneven filament thickness caused by large velocity differences near the hole wall and center when the melt passes through guide holes of different diameters, thus improving the uniformity of filament quality. Furthermore, several protrusions are provided on the sidewall of the first guide hole, the sidewall of the second guide hole is roughened, and the sidewall of the third guide hole is smoothed, with the third guide hole having a mirror-like smoothness. When the melt passes through the first guide hole, it is blocked by the protrusions, thereby prolonging the flow time of the melt in the first guide hole and helping to reduce... Stress concentration occurs during melt ejection; as the melt passes through the second guide hole, the flow resistance is relatively reduced, while the rough hole wall provides some resistance to melt flow, appropriately extending the melt's flow time within the second guide hole, further suppressing melt expansion, and preventing thermal degradation reactions caused by prolonged melt residence in the guide hole; as the melt passes through the third guide hole, the smooth hole wall can shape the melt surface, keeping it smooth and reducing friction and adhesion between the melt and the hole wall, improving melt fluidity, reducing internal tension dispersion, thus benefiting the roundness of the extruded melt stream and resulting in uniform quality of the formed monofilaments; existing technologies use a fixed length... The method of reducing the length-to-diameter ratio to reduce the stress during melt ejection, when the orifice diameter cannot be reduced, requires the use of thicker metal materials, thus increasing the manufacturing cost of the spinneret. The multi-stage spinneret provided by this utility model increases the length-to-diameter ratio by setting multiple stages of guide holes with different diameters and using a combination of first, second, and third guide holes. At the same time, it increases the flow resistance of the melt by setting a protrusion in the first guide hole and a rough wall in the second guide hole, thereby extending the flow time of the melt in the guide holes. This can further reduce the stress concentration during melt ejection, thereby reducing the stress during melt ejection with the same thickness of metal material, and thus reducing the manufacturing cost of the spinneret. Attached Figure Description

[0021] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0022] Figure 1 This is a three-dimensional structural diagram of the multi-stage spinneret provided in Embodiment 1 of this utility model.

[0023] Figure 2 This is a cross-sectional structural diagram of the multi-stage spinneret provided in Embodiment 1 of this utility model.

[0024] Figure 3 This is a cross-sectional structural diagram of the guide hole provided in Embodiment 1 of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0026] Example 1:

[0027] like Figure 1 and Figure 3 As shown, Embodiment 1 of this utility model provides a multi-stage spinneret, which includes a spinneret body 1; the spinneret body 1 has a plurality of guide holes 11 extending from the top to the bottom; the guide holes 11 include a first guide hole 111, a second guide hole 112 and a third guide hole 113;

[0028] The first guide hole 111, the second guide hole 112, and the third guide hole 113 are all vertically arranged; the first guide hole 111 is located above the second guide hole 112; the second guide hole 112 is located above the third guide hole 113; the axes of the first guide hole 111, the second guide hole 112, and the third guide hole 113 coincide; the diameter of the first guide hole 111 is larger than the diameter of the second guide hole 112; the diameter of the second guide hole 112 is larger than the diameter of the third guide hole 113; the first guide hole 111, the second guide hole 112, and the third guide hole 113 are connected.

[0029] The first guide hole 111 has a plurality of protrusions 1111 on its sidewall; all the protrusions 1111 are evenly distributed on the sidewall of the first guide hole 111; the sidewall of the second guide hole 112 is rough; the sidewall of the third guide hole 113 is smooth.

[0030] A first connecting hole 114 is provided between the first guide hole 111 and the second guide hole 112; a second connecting hole 115 is provided between the second guide hole 112 and the third guide hole 113;

[0031] The first connecting hole 114 and the second connecting hole 115 are funnel-shaped; the top cross-section of the first connecting hole 114 and the second connecting hole 115 is larger than the bottom cross-section; the cross-sections of the first connecting hole 114 and the second connecting hole 115 gradually decrease from the top to the bottom; the top of the first connecting hole 114 is connected to and communicates with the bottom of the first guide hole 111; the bottom of the first connecting hole 114 is connected to and communicates with the top of the second guide hole 112; the top of the second connecting hole 115 is connected to and communicates with the bottom of the second guide hole 112; the bottom of the second connecting hole 115 is connected to and communicates with the top of the third guide hole 113.

[0032] The top opening diameter of the first connecting hole 114 is the same as the bottom diameter of the first guide hole 111; the bottom opening diameter of the first connecting hole 114 is the same as the top diameter of the second guide hole 112; the top opening diameter of the second connecting hole 115 is the same as the bottom diameter of the second guide hole 112; and the bottom opening diameter of the second connecting hole 115 is the same as the top diameter of the third guide hole 113.

[0033] When using the multi-stage spinneret provided in Embodiment 1 of this utility model, the spinneret body 1 is connected to the screw extruder; the melt formed after the slices are melted enters from the guide hole 11 on the spinneret body 1, and the melt flows through the first guide hole 111, the first connecting hole 114, the second guide hole 112, the second connecting hole 115 and the third guide hole 113, and finally the melt is extruded from the bottom of the third guide hole 113 from the spinneret body 1.

[0034] The multi-stage spinneret provided in Embodiment 1 of this utility model allows the molten material to sequentially pass through a first guide hole 111, a second guide hole 112, and a third guide hole 113 on the spinneret body 1. The molten material enters from the larger-diameter first guide hole 111 into the smaller-diameter second guide hole 112, and then from the second guide hole 112 into the even smaller-diameter third guide hole 113. The diameter of the guide holes decreases through multiple stages, increasing the aspect ratio by combining the first guide hole 111, the second guide hole 112, and the third guide hole 113. This prolongs the flow time of the molten material within the guide holes 11, guiding the molten material to gradually flow through the guide holes 11. This adapts to shear stress, thereby reducing stress concentration during melt ejection, suppressing the expansion phenomenon caused by melt elastic recovery, and thus improving the roundness of monofilament formation. Furthermore, when the melt enters the second guide hole 112 from the first guide hole 111, it passes through the first connecting hole 114; when the melt enters the third guide hole 113 from the second guide hole 112, it passes through the second connecting hole 115. The two gradually decreasing diameter connecting holes make the melt velocity distribution within the guide hole 11 more uniform, thus avoiding the large velocity difference between near the hole wall and the center when the melt passes through guide holes of different diameters. This addresses the issue of uneven monofilament thickness, thereby improving the uniformity of monofilament quality. Furthermore, several protrusions 1111 are provided on the sidewall of the first guide hole 111, the sidewall of the second guide hole 112 is roughened, and the sidewall of the third guide hole 113 is smoothed, with the third guide hole 113 exhibiting a mirror-like smoothness. When the melt passes through the first guide hole 111, it is blocked by the protrusions 1111, thus prolonging the melt's flow time in the first guide hole 111 and helping to reduce stress concentration during melt ejection. When the melt passes through the second guide hole 112, the flow resistance experienced by the melt is relatively... The rough orifice wall reduces the resistance to melt flow, appropriately prolonging the melt flow time in the second guide hole 112, further suppressing melt expansion, and avoiding thermal degradation reaction caused by the melt staying in the guide hole 11 for a long time; when the melt passes through the third guide hole 113, the smooth orifice wall can shape the melt surface, keeping the melt surface smooth, and reducing friction and adhesion between the melt and the orifice wall, improving melt fluidity, reducing internal tension divergence, which is beneficial to the roundness of the melt extrusion stream and makes the formed monofilament quality uniform;

[0035] Existing technologies use a fixed aspect ratio to reduce the stress during melt ejection. However, when the orifice diameter cannot be reduced, thicker metal materials are required, increasing the manufacturing cost of the spinneret. The multi-stage spinneret provided in Embodiment 1 of this utility model increases the aspect ratio by setting multiple stages of guide holes with different diameters and combining the first guide hole 111, the second guide hole 112, and the third guide hole 113. At the same time, it increases the flow resistance of the melt by setting a protrusion in the first guide hole 111 and a rough wall in the second guide hole 112, thus extending the flow time of the melt in the guide hole 11. This further reduces the stress concentration during melt ejection, achieving a reduction in the stress during melt ejection with the same thickness of metal material, thereby reducing the manufacturing cost of the spinneret.

[0036] like Figures 1-2 As shown, the multi-stage spinneret provided in Embodiment 1 of this utility model is preferably further provided with a temperature control component 2 in order to avoid the situation where the melt viscosity is unstable due to uneven temperature of the melt in the guide hole 11, thereby affecting the stress. The temperature control component 2 includes a temperature conductor 21, a plurality of fixing rods 22, a plurality of clamping components 23, a plurality of first temperature sensors 24 and a plurality of second temperature sensors 25.

[0037] The spinneret body 1 has a circular cross-section, and all the guide holes 11 are arranged in a circular array with the center of the spinneret body 1 as the center. The distance from each guide hole 11 to the center of the spinneret body 1 is equal, so that the distance between each guide hole 11 and the edge of the spinneret body 1 is equal. As a result, each guide hole 11 is subjected to the same external cooling or heating effect, and the melt in each guide hole 11 has the same filamentation effect.

[0038] Furthermore, the temperature-conducting element 21 is annular, and the spinneret body 1 is located inside the inner circle of the temperature-conducting element 21. The center of the spinneret body 1 coincides with the center of the temperature-conducting element 21. An annular ventilation channel 26 is formed between the spinneret body 1 and the temperature-conducting element 21. Air passes through the ventilation channel 26 from above the spinneret body 1, causing each guide hole 11 to cool down. Appropriately reducing the melt temperature can increase the viscosity of the melt, thereby slowing down the flow of the melt in the guide hole 11.

[0039] Furthermore, to prevent the melt temperature from being too low and to avoid uneven heating of the melt, it is necessary to keep the melt at a constant temperature. For this purpose, the following structure is also included: the temperature-conducting element 21 has several fixing holes 211 from the outer circle to the inner circle, and the fixing holes 211 connect the outer circle space and the inner circle space of the temperature-conducting element 21; the fixing rods 22 are sleeved in the fixing holes 211, and all the fixing rods 22 face the center of the temperature-conducting element 21. All the fixing rods 22 are arranged in a circular array with the center of the temperature-conducting element 21 as the center.

[0040] The clamping member 23 includes several curved panels 231 and several inserts 232;

[0041] The curved panel 231 is vertically arranged, and a plug 232 is fixed to the concave side of the curved panel 231; the end of the fixing rod 22 facing the spinneret body 1 is fixed to the convex side of the curved panel 231.

[0042] A number of slots 12 are provided on the arc-shaped sidewall of the spinneret body 1; all slots 12 are arranged in a circular array with the center of the spinneret body 1 as the center; one insert 232 corresponds to one slot 12; when the fixing rod 22 is pushed toward the spinneret body 1, the insert 232 is inserted into the slot 12. At this time, the concave side of the arc-shaped panel 231 is in close contact with the arc-shaped sidewall of the spinneret body 1. The pushing force applied by the fixing rod 22 toward the spinneret body 1 can make the arc-shaped panel 231 clamp the spinneret body 1, thereby fixing the temperature conductor 21 to the spinneret body 1.

[0043] The temperature-conducting component 21 is equipped with a heating coil. By providing a regulated current to the heating coil, the heating coil is kept at a constant temperature. The heating coil heats up the temperature-conducting component 21, and the heat on the temperature-conducting component 21 is transferred along the fixing rod 22 to the arc-shaped panel 231. Since the arc-shaped panel 231 is in contact with the arc-shaped sidewall of the spinneret body 1, the heat on the arc-shaped panel 231 is transferred to the arc-shaped sidewall of the spinneret body 1, which heats the guide hole 11 at a constant temperature, keeping the melt at an appropriate temperature. Furthermore, since the fixing rod 22 is arranged in a circumferential array with the center of the temperature-conducting component 21 as the center, and the arc-shaped panel 231 is also arranged in a circumferential array with the center of the temperature-conducting component 21 as the center, the spinneret body 1 can be heated evenly, so that the melt in each guide hole 11 has the same filamentation effect.

[0044] To facilitate temperature control, the first temperature sensor 24 is fixed to the arc-shaped side wall of the spinneret body 1, and the second temperature sensor 25 is fixed to the temperature conductor 21. The temperature of the spinneret body 1 is monitored in real time by the first temperature sensor 24, and the required constant temperature can be viewed by the second temperature sensor 25. By continuously introducing air into the ventilation duct 26, the melt in the guide hole 11 is continuously cooled, and at the same time, the temperature conductor 21 maintains a constant temperature for the spinneret body 1, so that the first temperature sensor 24 and the second temperature sensor 25 maintain the same value.

[0045] By taking the above steps, the melt temperature is reduced, the melt viscosity is increased, and the flow rate of the melt in the guide hole 11 is slowed down, thereby helping the melt reduce stress. At the same time, the melt can be heated evenly in the guide hole 11, avoiding the situation where the melt viscosity is unstable due to uneven temperature in the guide hole 11, which would affect the stress.

[0046] More specifically, if it is necessary to disassemble the spinneret body 1, the fixing rod 22 is pulled to the outside of the temperature guide 21, so that the insert block 232 leaves the slot 12, thereby allowing the spinneret body 1 to be removed from the inner circle of the temperature guide 21, and the spinneret body 1 and the temperature guide 21 are separated.

[0047] The multi-stage spinneret provided in Embodiment 1 of this utility model preferably includes several cylinders in order to maintain the thrust applied by the fixing rod 22 toward the spinneret body 1; the telescopic rod of the cylinder is fixed to the end of the fixing rod 22 away from the spinneret body 1; the orientation of the telescopic rod of the cylinder is consistent with the orientation of the fixing rod 22.

[0048] In summary, the multi-stage spinneret provided by this utility model can solve the problem that existing technologies require the use of thicker metal materials to reduce the stress during molten material ejection, thereby increasing the manufacturing cost of the spinneret. This invention achieves the goal of reducing the stress during molten material ejection while simultaneously reducing the manufacturing cost of the spinneret.

[0049] Those skilled in the art should understand that variations can be implemented by combining existing technology and the above embodiments, and will not be elaborated here. Such variations do not affect the substantive content of this utility model, and will not be elaborated here.

[0050] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art; any possible variations and modifications made by those skilled in the art without departing from the technical solution of this utility model, or equivalent embodiments with equivalent changes, do not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.

Claims

1. A multi-stage spinneret, characterized by, The multistage spinneret comprises a spinneret body; a plurality of flow guide holes are arranged on the spinneret body and penetrate from top to bottom; the flow guide holes comprise first flow guide holes, second flow guide holes and third flow guide holes; The first flow guide holes, the second flow guide holes and the third flow guide holes are vertically arranged; the first flow guide holes are located above the second flow guide holes; the second flow guide holes are located above the third flow guide holes; the axes of the first flow guide holes, the second flow guide holes and the third flow guide holes coincide; the diameter of the first flow guide holes is larger than that of the second flow guide holes; the diameter of the second flow guide holes is larger than that of the third flow guide holes; the first flow guide holes, the second flow guide holes and the third flow guide holes are connected; A plurality of protruding parts are arranged on the side wall of the first flow guide holes; all the protruding parts are uniformly distributed on the side wall of the first flow guide holes; the side wall of the second flow guide holes is rough; the side wall of the third flow guide holes is smooth; A first connecting hole is arranged between the first flow guide holes and the second flow guide holes; a second connecting hole is arranged between the second flow guide holes and the third flow guide holes; The first connecting hole and the second connecting hole are trumpet-shaped; the top cross section of the first connecting hole and the second connecting hole is larger than the bottom cross section; the cross section of the first connecting hole and the second connecting hole gradually decreases from top to bottom; The top of the first connecting hole is connected with the bottom of the first flow guide hole; the bottom of the first connecting hole is connected with the top of the second flow guide hole; the top of the second connecting hole is connected with the bottom of the second flow guide hole; the bottom of the second connecting hole is connected with the top of the third flow guide hole; The top opening diameter of the first connecting hole is equal to the bottom diameter of the first flow guide hole; the bottom opening diameter of the first connecting hole is equal to the top diameter of the second flow guide hole; the top opening diameter of the second connecting hole is equal to the bottom diameter of the second flow guide hole; the bottom opening diameter of the second connecting hole is equal to the top diameter of the third flow guide hole.

2. The multi-stage spinneret of claim 1, wherein, The multistage spinneret further comprises a temperature control assembly; the temperature control assembly comprises a temperature guide, a plurality of fixing rods, a plurality of clamping parts, a first temperature sensor and a second temperature sensor; The cross section of the spinneret body is circular; all the flow guide holes are arranged in a circular array with the center of the spinneret body as the center; The temperature guide is annular; the spinneret body is located in the inner circle of the temperature guide; the center of the spinneret body and the center of the temperature guide coincide; an air duct is formed between the spinneret body and the temperature guide; A plurality of fixing holes are arranged on the temperature guide from the outer circle to the inner circle; the fixing holes connect the space of the outer circle and the space of the inner circle of the temperature guide; the fixing rods are sleeved in the fixing holes; the fixing rods are all directed to the center of the temperature guide; all the fixing rods are arranged in a circular array with the center of the temperature guide as the center; The clamping part comprises a circular arc curved surface plate and a plug; the circular arc curved surface plate is vertically arranged; one plug is fixed to the recessed side of one circular arc curved surface plate; the end of the fixing rod directed to the side of the spinneret body is fixed to the protruding side of the circular arc curved surface plate; The arc-shaped side wall of the spinneret body is provided with a plurality of insertion slots; all the insertion slots are arranged in a circular array with the center of the spinneret body as the center; one insertion block corresponds to one insertion slot; the insertion block is embedded in the insertion slot; the concave side of the circular arc panel is closely attached to the arc-shaped side wall of the spinneret body; The temperature guide piece is provided with a heating coil; the first temperature sensor is fixed on the arc-shaped side wall of the spinneret body; and the second temperature sensor is fixed on the temperature guide piece.

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