Multi-hole composite spinneret plate assembly for single plate

Abstract

The spinneret assembly comprises a cooling sleeve, an outer sleeve, a spinneret plate and a heating plate, the spinneret plate and the heating plate are both fixed in the outer sleeve, the spinneret plate is located on the upper side of the heating plate, a plurality of adjusting cavities are distributed on the spinneret plate in a rhombic mode, and the adjusting cavities are communicated with the cooling sleeve. Heaters in one-to-one correspondence with the adjusting cavities are distributed on the heating plate in a rhombus shape, a cooling sleeve is correspondingly arranged below each heater, and a drainage pipe is arranged in each adjusting cavity; airflow is used for cooling and shaping the tows, the jet direction of the airflow is parallel to the axis of the tows, and the cooling effect is ensured; based on the influence of temperature on the melt and the resistance generated in the flowing process of the melt in the drainage tube, the contact part of the annular conducting strip and the adjusting resistor is adjusted, so that the heating power of the heater and the spinning rate when the melt passes through the drainage tube form a negative feedback mechanism to automatically adjust the spinning rate, and the stability of the spinning rate is maintained.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a single-plate multi-hole composite spinneret assembly. Background Art

[0002] The melt spinning process is generally carried out in a spinning machine. When spinning, the spinning machine generally uses a heat medium to keep the melt warm so that the melt temperature is basically the same as that during the entire flow process. During spinning, the melt needs to pass through the spinneret with a lower apparent viscosity, and the apparent viscosity of fiber-grade materials generally decreases with increasing temperature. In order to maintain the spinning rate, the spinning temperature needs to be 20 to 30°C higher than the melting point of the material. Under normal circumstances, the thermal stability of fiber-forming polymer materials above the melting point is poor. Excessive temperature will destroy the material structure and cause thermal decomposition. In addition, excessive temperature will cause the filament bundle at the spinneret nozzle to fail to completely cool and shape because it has just been ejected. As the length of the filament bundle increases, the weight of the filament bundle will pull the filament bundle to deform, affecting the quality of the filament bundle.

[0003] In the existing spinning assembly design, spinnerets are mostly arranged uniformly or in a traditional rectangular arrangement, which has the following problems: the conventional arrangement leads to insufficient cooling of the inner layer of filaments, affecting the solidification molding effect; in the current single-plate multi-hole spinning assembly, the guide holes cause flow resistance at high discharge volume, and the spinneret rates of different guide holes vary, affecting the extrusion uniformity.

[0004] In view of the shortcomings of existing technologies, technical improvements need to be made based on the above-mentioned shortcomings. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a single-plate multi-hole composite spinneret assembly to solve the above problems.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A single-plate multi-porous composite spinneret assembly, wherein a guide portion, a filter portion and a distribution portion are sequentially arranged on the upper side of the spinneret assembly, a melt inlet is opened in the middle of the upper side of the guide portion, and the guide portion, the filter portion, the distribution portion and the spinneret assembly are connected end to end through a sealing structure to form an integral spinneret end head; the spinneret assembly specifically comprises a coaxially assembled cooling sleeve, an outer sleeve, a spinneret and a heating plate, wherein the spinneret and the heating plate are vertically fixed to the inner wall of the outer sleeve by bolts, and an insulating heat-insulating layer is provided between the spinneret and the heating plate, the spinneret is located directly above the heating plate, and a plurality of cylindrical adjustment chambers penetrating the plate body are arranged in a diamond array on the surface of the spinneret, and a sheet heater is inlaid on the surface of the heating plate corresponding to the center position of each adjustment chamber, and all heaters form a diamond distribution array on the surface of the heating plate consistent with the arrangement of the adjustment chamber.

[0007] Furthermore, a cooling sleeve is coaxially arranged directly below each of the heaters, and the upper end surface of the cooling sleeve is tightly fitted with the bottom surface of the heating plate; a vertically penetrating drainage tube is inserted into each of the adjustment chambers, and the heating area of the heater is directly opposite to the upper end of the drainage tube and realizes local radiation heating thereon.

[0008] Furthermore, two strip-shaped adjustment resistors are symmetrically embedded in the inner wall of each adjustment chamber, and L-shaped conductive plates are fixed on both sides of the bottom of the adjustment chamber; the upper end of the conductive plate is electrically connected to the top of the adjustment resistor on the same side through a silver alloy wire, and the lower ends of the conductive plates on both sides are respectively connected to the positive and negative poles of the external DC power supply through wires, and one of the conductive plates on one side is also connected to the power supply end of the heater through a shunt wire.

[0009] Furthermore, the lower port of the drainage tube is processed into an inward-contracting conical structure, and the upper outer wall of the drainage tube is integrally formed with an annular limiting protrusion; the outer side of the limiting protrusion is tightly covered with a copper annular conductive sheet, and the outer peripheral surface of the annular conductive sheet maintains sliding electrical contact with the inner walls of the two adjustment resistors.

[0010] Furthermore, a spiral positioning spring is provided on the outside of the drainage tube, the upper end of the positioning spring is welded and fixed to the bottom surface of the limiting protrusion, and the lower end of the positioning spring is fixedly connected to the upper surface of the heating plate through a snap structure; the positioning spring maintains a constant contact pressure between the annular conductive sheet of the drainage tube and the adjustment resistor in a natural state.

[0011] The beneficial effects of the present invention are as follows: the present invention utilizes air flow to cool and shape the filament bundle, and the jet direction of the air flow is parallel to the axis of the filament bundle, thereby ensuring a cooling effect; at the same time, when the air flow flows in the exhaust pipe, a negative pressure is formed at the contraction part of the exhaust pipe, so that the air pressure in the area below the drainage pipe is lower than the ambient pressure, forming a pressure difference in which the closer to the drainage pipe, the lower the air pressure is, thereby reducing the pulling force of the filament at the lower end of the drainage pipe, thereby avoiding the filament being pulled and deformed before it is completely cooled and shaped; based on the influence of temperature on the melt and the resistance generated by the melt during its flow in the drainage pipe, the contact position of the annular conductive sheet and the regulating resistor is adjusted, so that the heating power of the heater and the spinning rate when the melt passes through the drainage pipe form a negative feedback mechanism to self-adjust the spinning rate and maintain the stability of the spinning rate; and the melt is used to drive the drainage pipe to slide to adjust the circuit current and form a feedback mechanism with the electromagnet, thereby adjusting the cooling airflow size and ensuring a cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the structure diagram of the spinneret tip; Figure 2 Figure 1 is the internal structure diagram of the spinneret assembly; Figure 3 for Figure 2 A partial enlarged view of part A in the middle; Figure 4This is a diagram of the drainage tube structure; Figure 5 This is the structural diagram of the cooling sleeve; Figure 6 Cross-sectional view of the lower end of the drainage tube when it is a single nozzle.

[0013] Numbers in the figure: 1 guide part; 2 filter part; 3 distribution part; 4 spinneret assembly; 5 cooling sleeve; 501 negative pressure cavity; 502 exhaust pipe; 503 suction hole; 504 air inlet; 6 outer sleeve; 7 spinneret; 701 regulating chamber; 8 heating plate; 9 heater; 10 drainage tube; 1001 limiting protrusion; 11 regulating resistor; 12 conductive sheet; 13 annular conductive sheet; 14 positioning spring; 15 plug; 16 magnet block; 17 electromagnet; 18 limiting tension spring. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: like Figure 1-6 As shown, a single-plate multi-porous composite spinneret assembly is provided on the upper side of the spinneret assembly 4, a guide portion 1, a filter portion 2, and a distribution portion 3 are provided, a melt inlet is provided in the middle of the upper side of the guide portion 1, and the guide portion 1, the filter portion 2, the distribution portion 3, and the spinneret assembly 4 are connected end to end to form a spinneret end as a whole, so that the melt passes through the guide portion 1, the filter portion 2, and the distribution portion 3 in sequence and finally enters the spinneret assembly 4. The spinneret assembly 4 includes a cooling sleeve 5, an outer sleeve 6, a spinneret 7, and a heating plate 8, wherein the spinneret 7 and the heating plate 8 are fixed on the outer sleeve. 6, the spinneret 7 is located on the upper side of the heating plate 8, and a plurality of regulating chambers 701 are arranged in a diamond shape on the spinneret 7, and heaters 9 corresponding to the regulating chambers 701 are distributed in a diamond shape on the heating plate 8. There is a cooling sleeve 5 under each heater 9, and a drainage tube 10 is provided in each regulating chamber 7. The heater 9 heats the drainage tube 10 to rapidly heat the melt in the drainage tube 10, reduce the viscosity of the melt, and improve the fluidity of the melt to meet the spinning requirements. The cooling sleeve 5 cools the filament bundle ejected from the drainage tube 10.

[0015] In this embodiment, two adjustment resistors 11 are symmetrically arranged on the side wall of the adjustment chamber 701, and a conductive sheet 12 is symmetrically fixed to the lower end of the adjustment chamber 701. The conductive sheet 12 is connected to the upper end of the adjustment resistor 11 on the corresponding side through a wire, and the two conductive sheets 12 are respectively connected to the power supply and the heater 9 through wires. The drainage tube 10 shrinks near the lower port so that the lower port of the drainage tube 10 is smaller than the upper port, and a limiting protrusion 1001 is provided near the upper end of the drainage tube 10. The side of the limiting protrusion 1001 is wrapped with an annular conductive sheet 13. The annular conductive sheet 13 contacts the adjustment resistor 11, so that the power supply, the adjustment resistor 11 and the heater 9 form a series closed circuit. The drainage tube 10 slides up and down to adjust the position of the annular conductive sheet 13, thereby adjusting the size of the adjustment resistor 11 connected to the circuit. A positioning spring 14 is sleeved on the drainage tube 10, and the upper end of the positioning spring 14 is fixedly connected to the limiting protrusion 1001, and the lower end of the limiting spring 14 is fixedly connected to the heating plate 8.

[0016] In this embodiment, the cooling sleeve 5 is an annular structure, which is convenient for the filament bundle to pass through the middle of the cooling sleeve 5. A threaded portion is provided on the upper side of the cooling sleeve 5 to facilitate fixed connection with the heating plate 8 through thread. The cooling sleeve 5 includes an annular negative pressure cavity 501 and an exhaust pipe 502. The exhaust pipe 502 is evenly distributed around the outside of the negative pressure cavity 501. The inside of the negative pressure cavity 501 is evenly distributed with multiple rows of suction holes 503 with gradually decreasing apertures from bottom to top. The exhaust pipe 502 is a contraction-shaped structure near the lower end outlet, and the contraction part of the exhaust pipe 502 is connected to the negative pressure cavity 501. The exhaust pipe 502 is provided with an air inlet 504 near the upper end, and the air inlet 504 is connected to the negative pressure cavity 501 through the air pipe. It is connected to the air pump and is slidably connected to a circular plug 15 in the exhaust pipe 502. The height of the plug 15 is greater than the aperture of the air inlet 504. A magnet block 16 is fixedly connected to the plug 15 through a rice-shaped bracket. The airflow that enters the exhaust pipe 502 through the air inlet 504 flows downward through the gap between the magnet block 16 and the side wall of the plug 15. An electromagnet 17 is correspondingly provided on the side of the magnet block 16. The electromagnet 17 is fixedly connected to the top of the exhaust pipe 502. A limit spring 18 is provided under the plug 15. The upper end of the limit spring 18 is fixedly connected to the plug 15, and the lower end of the limit spring 18 is fixedly connected to the exhaust pipe 502. The electromagnet 17, the power supply, and the adjustment resistor 11 form a series circuit.

[0017] Working principle of the present invention: When the present invention is used, the melt is introduced from the melt inlet of the guide part 1. After the melt enters the drainage tube 10, the melt is rapidly heated in the drainage tube 10 under the heating action of the heater 9, thereby reducing the viscosity of the melt and improving the fluidity of the melt. The melt is then ejected from the lower end of the drainage tube 10 to form a filament bundle. The air pump then draws the airflow into the exhaust pipe 502 and ejects it through the lower port, ejecting it along the axial direction of the filament bundle. The airflow is used to cool and shape the filament bundle, and the ejection direction of the airflow is aligned with the axial direction of the filament bundle. The lines are parallel to each other to ensure the cooling effect. At the same time, when the air flow flows in the exhaust pipe 502, negative pressure is formed at the contraction part of the exhaust pipe 502. The air below the drainage pipe 10 enters the exhaust pipe 502 from the suction hole 503 through the negative pressure cavity 501 and is discharged. By extracting the air below the drainage pipe 10, the air pressure in the area below the drainage pipe 10 is lower than the ambient pressure, forming a pressure difference in which the closer to the drainage pipe 10, the lower the air pressure, thereby reducing the pulling force of the silk thread at the lower end of the drainage pipe 10, and avoiding the silk thread being pulled before it is completely cooled and shaped.

[0018] The higher the temperature, the lower the viscosity of the melt, the faster the fluidity of the melt, and the faster the spinning rate. Conversely, the lower the temperature, the higher the viscosity of the melt, the lower the fluidity of the melt, and the slower the spinning rate. During the flow of the melt, the friction between the melt and the side wall of the drainage tube 10 drives the drainage tube 10 to compress the positioning spring 14 and slide downward, adjusting the contact position between the annular conductive sheet 13 and the regulating resistor 11. By adjusting the resistance value of the access circuit regulating resistor 11, the heating power of the heater 9 is adjusted, so that the heating power of the heater 9 and the spinning rate when the melt passes through the drainage tube 10 form a negative feedback mechanism. The faster the spinning rate, the lower the heating power of the heater 9, which reduces the melt temperature in the drainage tube 10, thereby limiting the spinning rate. Conversely, the lowering of the spinning rate triggers the heating power of the heater 9 to increase, which increases the melt temperature in the drainage tube 10, thereby accelerating the spinning rate, thereby achieving control of the spinning rate and maintaining the stability of the spinning rate. According to the series circuit, the larger the resistance, the smaller the current. Therefore, the melt drives the drainage tube 10 to slide and forms a feedback mechanism with the electromagnet 17. The magnetic force of the electromagnet 17 is adjusted by adjusting the current. When the spindle speed increases, the current passed into the electromagnet 17 becomes smaller. Under the elastic force of the limit spring 18, the plug 15 is driven to slide downward, the air inlet 504 is adjusted to be larger, the air intake volume is increased, the amount of airflow in the exhaust pipe 502 is increased, and the cooling rate is enhanced. Similarly, when the spindle speed decreases, the current passed into the electromagnet 17 becomes larger, and the force between the electromagnet 17 and the magnet block 16 becomes larger. Under the elastic force of the limit spring 18, the plug 15 is driven to slide upward, the air inlet 504 is adjusted to be smaller, the air intake volume is reduced, and the amount of airflow in the exhaust pipe 502 is reduced. The feedback mechanism formed by the melt driving the drainage tube 10 to slide and the electromagnet 17 is used to adjust the cooling airflow size according to the spindle speed to ensure the cooling effect.

[0019] 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 single-plate multi-porous composite spinneret assembly, characterized by: The upper side of the spinneret assembly is provided with a guide part, a filter part and a distribution part in sequence, and a melt inlet is opened in the middle of the upper side of the guide part. The guide part, the filter part, the distribution part and the spinneret assembly are connected end to end through a sealing structure to form an integral spinneret end; the spinneret assembly specifically comprises a coaxially assembled cooling sleeve, an outer sleeve, a spinneret and a heating plate, wherein the spinneret and the heating plate are vertically fixed to the inner wall of the outer sleeve by bolts, and an insulating heat-insulating layer is provided between the spinneret and the heating plate, the spinneret is located directly above the heating plate, and a plurality of cylindrical adjustment chambers penetrating the plate body are arranged in a diamond array on the surface of the spinneret, and a sheet heater is inlaid on the surface of the heating plate corresponding to the center position of each adjustment chamber, and all heaters form a diamond distribution array on the surface of the heating plate that is consistent with the arrangement of the adjustment chamber.

2. The spinneret assembly according to claim 1, wherein: A cooling sleeve is coaxially arranged directly below each of the heaters, and the upper end surface of the cooling sleeve is tightly fitted with the bottom surface of the heating plate; a vertically penetrating drainage tube is inserted into each of the adjustment chambers, and the heating area of the heater is directly opposite to the upper end of the drainage tube and realizes local radiation heating thereon.

3. The spinneret assembly according to claim 2, wherein: Two strip-shaped adjustment resistors are symmetrically embedded on the inner wall of each adjustment chamber, and L-shaped conductive sheets are fixed on both sides of the bottom of the adjustment chamber; the upper end of the conductive sheet is electrically connected to the top of the adjustment resistor on the same side through a silver alloy wire, and the lower ends of the conductive sheets on both sides are respectively connected to the positive and negative poles of the external DC power supply through wires, and one of the conductive sheets is also connected to the power supply end of the heater through a shunt wire.

4. The spinneret assembly according to claim 3, characterized in that: The lower port of the drainage tube is processed into an inward-contracting conical structure, and the upper outer wall of the drainage tube is integrally formed with an annular limiting protrusion; the outer side of the limiting protrusion is tightly covered with a copper annular conductive sheet, and the outer peripheral surface of the annular conductive sheet maintains sliding electrical contact with the inner walls of the two adjustment resistors.

5. The spinneret assembly according to claim 4, characterized in that: A spiral positioning spring is provided on the outside of the drainage tube, the upper end of the positioning spring is welded and fixed to the bottom surface of the limiting protrusion, and the lower end of the positioning spring is fixedly connected to the upper surface of the heating plate through a snap structure; the positioning spring maintains a constant contact pressure between the annular conductive sheet of the drainage tube and the adjustment resistor in a natural state.

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