Extraction apparatus for ultra-high molecular weight polyethylene fibers

Abstract

The utility model discloses an extraction device of ultrahigh molecular weight polyethylene fiber, including extraction tank, godet, godet lifting device and press silk roller, the extraction tank is divided into multiple extraction units through the baffle, is provided with godet and its vertical movement under the godet lifting device drive in each extraction unit, is provided with extraction liquid temperature control system close to the baffle, and the inside of baffle is the interlayer board of extraction liquid flow, and its upper end is equipped with the overflow inlet of the extraction liquid of extraction unit, and the lower extreme has the overflow outlet, and the flow direction of extraction liquid from liquid inlet to liquid outlet is contrary to the transmission direction of tow, the coil pipe of extraction liquid temperature control system is passed through cold or hot water, and the outer wall of extraction tank is equipped with extraction liquid outer circulation system, and extraction liquid outer circulation system is equipped with circulation pipe communication, and the liquid outlet and liquid inlet of each circulation pipe communication adjacent extraction unit. The utility model extraction liquid is along the uniformity of concentration of tow width and length direction between each extraction unit, and the tow cleaning effect is consistent.

Description

Technical Field

[0001] This utility model relates to a fiber extraction device, and more particularly to an extraction device for the production of ultra-high molecular weight polyethylene fiber. Background Technology

[0002] Ultra-high molecular weight polyethylene fiber, also known as high-strength and high-modulus polyethylene fiber, is currently the fiber with the highest specific strength and specific modulus in the world. It is spun from polyethylene with a molecular weight of 1 million to 5 million.

[0003] Due to the high specific strength and high specific modulus of polyethylene fiber, its specific strength is more than ten times that of steel wire of the same cross-section, and its specific modulus is second only to that of premium carbon fiber. Therefore, its tensile strength testing places much higher demands on the performance of the tensile testing apparatus compared to ordinary fibers. It requires the gripper of the fiber tensile testing apparatus to be able to clamp the fiber sample tightly without slipping during the tensile test, while also preventing damage to the fiber due to excessive clamping force.

[0004] The main production processes of ultra-high molecular weight polyethylene fiber are as follows: raw material preparation, twin-screw extruder, spinning box, spinneret, extraction, drying, heating and stretching, and winding.

[0005] Extraction primarily involves extracting and displacing a large amount of solvent from the filaments to obtain high-strength polyethylene fibers with high purity. The choice of extractant varies among manufacturers, and the production processes also differ. To date, it is difficult to find an ideal extractant that is economical, practical, safe, environmentally friendly, has good extraction results, and is also non-toxic and odorless.

[0006] From spinning to extraction, the filaments are continuously stretched randomly, changing in appearance from thick to thin, from translucent to milky white, and gradually increasing in stretchability, gaining some "strength." Looking at the interior of the filament, the molecular structure of the raw material doesn't change significantly; the macromolecules are not oriented and remain in a disordered state, largely isolated by solvent, preventing the formation of molecular chains. Without molecular chains, the filament cannot possess true strength. At this stage, the fiber's interior resembles a cylindrical network, with polyethylene molecules within it. As the fiber stretches and thins, solvent is continuously released, and the network shape changes from round to long, from combed to dense. The density between material molecules gradually increases, and the arrangement of macromolecules gradually shifts from a disordered state to a partially ordered state.

[0007] An extraction device is a specialized piece of equipment used in the production of high-strength, high-modulus polyethylene fibers. It is employed to extract impurities from the filament bundle during the post-spinning process of gelled filaments. Existing extraction devices mainly consist of a frame, extraction tanks, a transmission system, and a pressure roller system. A drawback of existing extraction devices is the inconsistent uniformity of the extractant concentration along the width of the filament bundle across different extraction tanks, which affects the cleaning effect. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide an extraction device for ultra-high molecular weight polyethylene fibers, in which the concentration of the extract in the fiber bundle width direction is uniform across the extraction tanks, and the fiber bundle cleaning effect is consistent.

[0009] To address the aforementioned technical problems, this utility model provides an extraction device for ultra-high molecular weight polyethylene fibers, comprising an extraction tank, a guide roller, a guide roller lifting device, and a pressing roller. The extraction tank is divided into multiple extraction units by a partition. Each extraction unit is equipped with a guide roller, which moves vertically under the drive of the guide roller lifting device. An extraction liquid temperature control system is located near the partition. The partition is a sandwich plate for the flow of extraction liquid, with an overflow inlet at the upper end for overflowing extraction liquid from the extraction unit when it is full, and an overflow outlet at the lower end. The flow direction of the extraction liquid from the inlet to the outlet is opposite to the transmission direction of the fiber bundle. The extraction liquid temperature control system consists of multiple sets of meandering coils, with cold or hot water circulating inside the coils. An external circulation system for the extraction liquid is provided on the outer wall of the extraction tank, with multiple circulation pipes connected to each other. Each circulation pipe connects the outlet and inlet of an adjacent extraction unit.

[0010] Furthermore, the partition has a back plate, a sealing plate, and an overflow plate, with an overflow inlet formed between the sealing plate and the overflow plate, and an overflow outlet formed between the back plate and the overflow plate.

[0011] Furthermore, the partition plate has internal stiffeners that connect the overflow plate and the back plate.

[0012] Furthermore, the overflow inlet and overflow outlet are distributed on both sides of the back plate, and the back plate is sealed to the extraction tank.

[0013] Furthermore, the inlet of the extract is a hole evenly distributed along the width of the filament bundle.

[0014] Furthermore, the extraction tank is equipped with an inlet and an outlet for sealing water, and the liquid seal height of the sealing water is adjusted by a threaded pipe.

[0015] Furthermore, multiple extraction tanks are provided and connected to each other via connecting pipes.

[0016] Furthermore, the guide roller is provided with a positioning guide roller guide groove.

[0017] The technical advantages of this invention are as follows: In this high molecular weight polyethylene fiber extraction device, the direction of fiber bundle conveying in the extraction tank is opposite to the direction of extractant flow. The extractant first flows into the first extraction unit from a row of inlet holes along the width of the fiber bundle in the inlet tank. After overflowing, the extractant enters the partition jacket and then flows out from the partition outlet at the bottom of each tank, and so on. This ensures the uniformity of extractant concentration along the width and length of the fiber bundle in each extraction unit, resulting in a consistent fiber bundle cleaning effect and facilitating quality control when expanding production capacity. Furthermore, the extractant continuously tumbles up and down in different extraction units along the flow direction, constantly turning the extractant at the bottom of the extraction unit to the top, thereby achieving complete replacement of the extractant and preventing the extractant at the bottom from not being adequately refreshed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the extraction device for ultra-high molecular weight polyethylene fiber according to this utility model.

[0019] Figure 2 This is a schematic diagram of the extraction liquid temperature control system of the extraction device of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the partition of this utility model;

[0021] Figure 4 This is a schematic diagram of the external circulation system of the extract in this utility model;

[0022] Figure 5 yes Figure 4 Top view of the system structure;

[0023] Figure 6 yes Figure 4 A side view of the system. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1-6 As shown, this utility model discloses an extraction device 1 for ultra-high molecular weight polyethylene fiber, which includes an extraction tank 11, a guide roller 12, a guide roller lifting device 13, and a pressing roller 14. The extraction tank is divided into multiple extraction units 15 by a partition 16. Each extraction unit 15 is provided with a guide roller 12, which moves vertically under the drive of the guide roller lifting device 13. The guide roller 12 is also provided with a positioning guide roller guide groove 121.

[0029] The partition 16 has an internal sandwich panel for the flow of extractant. Its upper end has an overflow inlet 161 for when the extractant from the extraction unit 15 overflows, and its lower end has an overflow outlet 162. In this embodiment, the partition 16 has a back plate 163, a sealing plate 164, and an overflow plate 165 forming a hollow sandwich panel. The overflow inlet 161 is formed between the sealing plate 164 and the overflow plate, and the overflow outlet 162 is formed between the back plate 163 and the overflow plate. Ribs 166 are distributed inside the partition 16, connecting the overflow plate and the back plate 163. The ribs 166 are fixed by tenon and tenon joints followed by welding. The back plate 163 is sealed to the extraction tank 11. The overflow inlet 161 and the overflow outlet 162 are distributed on both sides of the back plate 163. Therefore, the function of the partition 16 structure is as follows: the extract from the previous extraction unit 15 overflows from the upper overflow inlet 161 to the lower overflow outlet 162 and flows out into the next extraction unit 15. Thus, the extract continuously tumbles within different extraction units along the flow direction, continuously raising the extract at the bottom of the extraction unit 15 to the top, achieving complete replacement of the extract and ensuring thorough replacement of the extract settled at the bottom. The flow direction of the extract from the inlet 17 to the outlet 18 is opposite to the transmission direction of the filament bundle 19, facilitating thorough cleaning during filament bundle cleaning. In this embodiment, the inlet 17 of the extract is an inlet hole evenly distributed along the width direction of the filament bundle 19 and connected to the inlet tank, with the width direction of the filament bundle 19 perpendicular to the length direction of the filament bundle 19.

[0030] An extractant temperature control system 30 is installed near the partition 16. The extractant temperature control system 30 is a meandering coil 301. Cold water or hot water solution is circulated in the coil 301 to regulate the heating or cooling of the extractant.

[0031] An external circulation system 20 for the extractant is provided on the outer wall of the extraction tank 11. The external circulation system 20 is provided with multiple circulation pipes 201 connected together. Each circulation pipe is connected to the outlet 151 and inlet 152 of the adjacent extraction unit 15. The outlet 151 of the next extraction unit 15 is connected to the inlet 152 of the previous extraction unit 15.

[0032] The extraction tank 11 is equipped with an inlet 41 and an outlet 41 for sealing water. The liquid seal height of the sealing water is adjusted by a threaded pipe 21. The white oil solvent in the fiber bundle is extracted and washed out. The white oil floats on the surface of the liquid seal water and is partially dissolved in the extractant. It is discharged together with the extractant into the separation and purification equipment.

[0033] Multiple extraction tanks 11 are provided and connected to each other through connecting pipes 2.

[0034] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An extraction device for ultra-high molecular weight polyethylene fiber, comprising an extraction tank, a guide roller, a guide roller lifting device, and a pressing roller, wherein the extraction tank is divided into multiple extraction units by partitions, each extraction unit is equipped with a guide roller that moves vertically under the drive of the guide roller lifting device, and an extraction liquid temperature control system is provided near the partitions, characterized in that... The partition plate has a sandwich panel for the flow of extractant. Its upper end is provided with an overflow inlet for the extractant from the extraction unit to overflow when it is full, and its lower end is provided with an overflow outlet. The flow direction of the extractant from the inlet to the outlet is opposite to the transmission direction of the filament bundle. The extractant temperature control system consists of multiple sets of meandering coils, with cold or hot water flowing through the coils. An external circulation system for extractant is provided on the outer wall of the extraction tank. The external circulation system for extractant has multiple circulation pipes connected to each other. Each circulation pipe is connected to the outlet and inlet of the adjacent extraction unit.

2. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that, The partition has a back plate, a sealing plate and an overflow plate, with an overflow inlet formed between the sealing plate and the overflow plate, and an overflow outlet formed between the back plate and the overflow plate.

3. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 2, characterized in that, The partition has internal stiffeners that connect the overflow plate and the back plate.

4. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 2, characterized in that, The overflow inlet and overflow outlet are located on both sides of the back plate, and the back plate is sealed to the extraction tank.

5. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that, The inlet of the extract is a hole evenly distributed along the width of the filament bundle.

6. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that, The extraction tank is equipped with an inlet and an outlet for sealing water, and the liquid seal height of the sealing water is adjusted by a threaded pipe.

7. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that, The extraction tanks are provided in multiple ways and are connected by connecting pipes.

8. The extraction apparatus for ultra-high molecular weight polyethylene fiber according to claim 1, characterized in that, The guide roller is provided with a positioning guide roller guide groove.

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