A glue filter and its filter screen

Abstract

This application discloses a glue filter for preparing lyocell fibers and its filter screen. The filter screen has a columnar structure and includes a first protective layer, a first control layer, a filter layer, a second control layer, and a second protective layer stacked sequentially along its height direction. The first protective layer, the first control layer, the filter layer, the second control layer, and the second protective layer are all metal woven mesh structures. The pore size of the filter layer is larger than that of the first control layer and also larger than that of the second control layer. The diameter of the metal wires in the filter layer is larger than that of the metal wires in the first control layer and also larger than that of the metal wires in the second control layer. This filter screen structure can reduce cost and fluid resistance.

Description

Technical Field

[0001] This application relates to the field of fiber preparation technology, specifically to a liquid filter and its filter screen for preparing lyocell fibers. Background Technology

[0002] Lyocell is an environmentally friendly fiber that combines the advantages of both natural and synthetic fibers, such as strong moisture absorption and breathability, silky hand feel and luster, and easy dyeing. At the same time, Lyocell also has good cohesion and can be blended with various fibers in any proportion to change the structure of textiles and improve their performance.

[0003] The production of lyocell fibers includes processes such as sizing, solvent preparation, solvent filtration, and conveying. Among these, the solvent filter, using a filter screen, removes insoluble impurities from the solvent, providing a qualified spinning solvent for subsequent spinning processes. It is an indispensable part of lyocell spinning solvent production. The filtration performance of the filter screen directly affects the spinnability of the spinning solvent, thus impacting the quality of the finished product.

[0004] In related technologies, the filter screen of the adhesive filter is made of at least six layers of metal woven mesh stacked together. This type of filter screen has a large number of layers and high fluid resistance. Utility Model Content

[0005] The purpose of this application is to provide a liquid filter and its filter screen, which is used for the preparation of lyocell fibers. By optimizing the structure of the filter screen, the cost of the filter screen and the fluid flow resistance can be reduced.

[0006] To address the aforementioned technical problems, this application provides a filter screen for a glue filter used in the preparation of lyocell fibers. The filter screen has a columnar structure and includes a first protective layer, a first control layer, a filter layer, a second control layer, and a second protective layer stacked sequentially along its height direction. The first protective layer, the first control layer, the filter layer, the second control layer, and the second protective layer are all metal woven mesh structures. The pore size of the filter layer is larger than that of the first control layer and also larger than that of the second control layer. The diameter of the metal wires in the filter layer is larger than that of the metal wires in the first control layer and also larger than that of the metal wires in the second control layer.

[0007] Using the above scheme, the filter screen of the adhesive filter adopts a five-layer structure, namely a first protective layer, a first control layer, a filter layer, a second control layer, and a second protective layer stacked along the height of the filter screen. All five layers adopt a metal woven mesh structure to ensure structural strength. The pore size of the filter layer is larger than that of the first and second control layers on both sides, and the wire diameter of the filter layer is also larger than that of the wire diameter of the first and second control layers. In this way, the filter layer has better mechanical strength and compressive strength. While reducing the number of filter layers, the overall structural strength and reliability of the filter screen under high pressure conditions can be guaranteed. Compared with related technologies, this filter screen reduces at least one layer, which can reduce material costs and simplify the production process. At the same time, reducing the number of filter layers also helps to reduce the height of the filter screen, which helps to reduce the resistance to fluid flow.

[0008] In addition, the relatively large diameter of the metal wires in the filter layer and the relatively large pore size of the filter layer can create a larger space within the filter layer, which can accommodate more pollutants. This helps to improve the overall dirt holding capacity (i.e., dust holding capacity) of the filter screen, thereby helping to extend the service life of the filter screen.

[0009] In some possible implementations, the diameter of the metal wires in the filter layer is greater than the diameter of the metal wires in the first protective layer and greater than the diameter of the metal wires in the second protective layer.

[0010] In some possible implementations, the wire diameters of the first protective layer and the second protective layer are larger than the wire diameters of the first control layer and the second control layer.

[0011] In some possible implementations, the first protective layer is located upstream of the second protective layer along the flow direction of the adhesive, and the diameter of the wires in the first protective layer is larger than the diameter of the wires in the second protective layer.

[0012] In some possible implementations, the first control layer is located upstream of the second control layer along the flow direction of the adhesive, and the pore size of the first control layer is larger than that of the second control layer.

[0013] In some possible implementations, the pore sizes of both the first protective layer and the second protective layer are larger than the pore size of the filter layer.

[0014] In some possible implementations, at least one of the first protective layer, the first control layer, the filter layer, the second control layer, and the second protective layer is woven from stainless steel wire.

[0015] In some possible implementations, at least one of the first control layer and the second control layer is a twill weave structure.

[0016] In some possible implementations, at least one of the first protective layer, the second protective layer, and the filter layer is a plain weave structure.

[0017] This application also provides a liquid filter for the preparation of lyocell fibers, the liquid filter comprising at least one body, wherein a filter screen as described in any of the above claims is installed in the body, a first protective layer of the filter screen is located near the inlet side of the body, and a second protective layer of the filter screen is located near the outlet side of the body.

[0018] Since the adhesive filter includes the aforementioned filter screen, it has the same technical effects as the aforementioned filter screen, which will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the filter screen provided in one embodiment of this application;

[0020] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the filter screen.

[0021] The annotations in the attached figures are explained below:

[0022] Filter screen 100; first protective layer 110; first control layer 120; filter layer 130; second control layer 140; second protective layer 150. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this application, the specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0024] The ordinal numbers used in the embodiments of this application are for distinguishing different components with the same name and do not indicate a specific order or primary / secondary relationship. The term "multiple" in this application refers to two or more.

[0025] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the filter screen provided in one embodiment of this application; Figure 2 for Figure 1 The diagram shows a cross-sectional view of the filter screen. Wherein, Figure 2 for Figure 1 The diagram shown is a schematic diagram of the filter screen 100 after being cut along the cutting line 1C in the P direction. Figure 2 The woven mesh structure in the text is intended to distinguish the structure of different layers and does not represent the actual wire diameter or pore size. The relationship between the wire diameter and pore size of each woven layer of the filter screen 100 is described below.

[0026] This application provides a filter screen 100 for an adhesive filter used in the preparation of lyocell fibers.

[0027] The preparation of lyocell fibers includes processes such as slurry preparation, solvent preparation, solvent filtration, and conveying. Among these, solvent filtration is achieved through a solvent filter, which removes insoluble impurities from the solvent, providing a qualified spinning solvent for subsequent spinning processes. This is an indispensable part of lyocell spinning solvent production.

[0028] The filtration performance of the glue solution filter is related to its filter screen 100. The filtration performance of the filter screen 100 will directly affect the spinnability of the spinning glue solution, thereby affecting the finished quality of Lyocell fiber.

[0029] like Figure 1 As shown in the figure, the filter screen 100 has a columnar structure, which is illustrated in the figure as a cylindrical structure. In application, the shape of the filter screen 100 can be changed according to actual needs.

[0030] The filter 100 includes a first protective layer 110, a first control layer 120, a filter layer 130, a second control layer 140, and a second protective layer 150 stacked sequentially along its height direction; the first protective layer 110, the first control layer 120, the filter layer 130, the second control layer 140, and the second protective layer 150 are all metal woven mesh structures; the pore size of the filter layer 130 is larger than the pore size of the first control layer 120 and larger than the pore size of the second control layer 140; the wire diameter of the metal wire in the filter layer 130 is larger than the wire diameter of the metal wire in the first control layer 120 and larger than the wire diameter of the metal wire in the second control layer 140.

[0031] Using the above solution, the filter screen 100 of the adhesive filter adopts a five-layer metal mesh woven structure. Compared with related technologies, the number of layers is reduced by at least one, which can reduce material costs and simplify the production process to reduce processing costs. With the reduction in the number of layers of the filter screen 100, the thickness of the filter screen 100 can be reduced accordingly, or the height of the filter screen 100 can be reduced, thereby reducing the flow resistance of the adhesive through the filter screen 100 and helping to reduce energy consumption.

[0032] The filter layer 130 has a larger pore size than the first control layer 120 and the second control layer 140 on both sides. The wire diameter of the filter layer 130 is also larger than that of the first control layer 120 and the second control layer 140. This gives the filter layer 130 better mechanical strength and compressive strength. With the number of filter screen 100 layers reduced, the overall structural strength of the filter screen 100 and its reliability under high pressure conditions can be guaranteed.

[0033] In addition, the relatively large wire diameter of the metal wires in the filter layer 130 and the relatively large pore size of the filter layer 130 can create a larger space within the filter layer 130, which can accommodate more pollutants and improve the overall dirt holding capacity (i.e., dust holding capacity) of the filter screen, thereby helping to extend the service life of the filter screen.

[0034] In some embodiments, the wire diameter of the filter layer 130 is larger than that of the wire diameter of the first protective layer 110 and also larger than that of the wire diameter of the second protective layer 150. Compared with filter structures in related technologies where the wire diameter of the filter layer is relatively small, the filter layer 130 in this embodiment can have better structural strength and pressure resistance, and is better suited to high-pressure conditions.

[0035] In some implementations, the wire diameters of the first protective layer 110 and the second protective layer 150 are larger than those of the wire diameters of the first control layer 120 and the second control layer 140. Taking the flow of the adhesive from the first protective layer 110 to the second protective layer 150 during filtration as an example, the first protective layer 110 can provide better protection for the first control layer 120 during filtration, and the second protective layer 150 can provide better protection for the second control layer 140 during backwashing of the filter screen 100.

[0036] In some implementations, the pore sizes of the first protective layer 110 and the second protective layer 150 are both larger than the pore size of the filter layer 130. In this way, the first protective layer 110 and the second protective layer 150 can intercept larger particles of impurities while providing protection, without affecting the basic filtration performance of the filter screen 100.

[0037] In application, along the flow direction of the adhesive, the first protective layer 110 is located upstream of the second protective layer 150. That is, in actual use, when the adhesive flows through the filter screen 100, it sequentially flows through the first protective layer 110, the first control layer 120, the filter layer 130, the second control layer 140, and the second protective layer 150. In some embodiments, the wire diameter of the first protective layer 110 is set to be larger than the wire diameter of the second protective layer 150. In this way, when the adhesive flows, it first flows through the first protective layer 110, and the larger wire diameter of the first protective layer 110 can effectively prevent larger particles from directly impacting and damaging the internal structure of the filter screen 100.

[0038] Taking the flow of adhesive from the first protective layer 110 to the second protective layer 150 as an example, in some embodiments, the pore size of the first control layer 120 is larger than that of the second control layer 140. Thus, the pore size of the filter layer 130 > the pore size of the first control layer 120 > the pore size of the second control layer 140. The first control layer 120 can perform preliminary fine filtration, and simultaneously stabilize the filter layer 130. The filter layer 130 undertakes the main filtration task and provides a larger dust-holding pore size. The second control layer 140 performs further fine filtration and is the key layer determining the final filtration accuracy of the filter screen 100. The filter screen 100 can form a gradient filtration process: fine filtration (first control layer 120) → coarse filtration (filter layer 130) → fine filtration (second control layer 140), resulting in a more rational filtration path and relatively higher filtration efficiency.

[0039] In addition, during backwashing, the flushing fluid first rinses the second control layer 140 with smaller pore size, which helps to improve the cleaning effect on the filter screen 100.

[0040] Taking the flow of adhesive from the first protective layer 110 to the second protective layer 150 as an example, in a specific embodiment, the wire diameter of the metal wire in the filter layer 130 of the filter screen 100 is set to be greater than that of the metal wires in the first protective layer 110 and the second protective layer 150, which are also greater than the wire diameters of the metal wires in the first control layer 120 and the second control layer 140. Simultaneously, the pore size of the filter layer 130 is greater than that of the first control layer 120, which is greater than that of the second control layer 140. This ensures a stable structure for the filter screen 100, avoiding problems such as unstable filtration accuracy and uneven interlayer stress caused by a reduction in the number of layers. It ensures that impurities are intercepted layer by layer; large particles can be intercepted by the filter layer 130, while fine particles can be intercepted by the subsequent second control layer 140. This provides good protection for the precision layers of the filter screen 100 while maintaining filtration accuracy.

[0041] In some implementations, at least one of the first protective layer 110, the first control layer 120, the filter layer 130, the second control layer 140, and the second protective layer 150 is woven from stainless steel wire. This reduces the material cost of the filter screen 100, and the stainless steel wire woven mesh has good structural strength and stability.

[0042] In some implementations, at least one of the first control layer 120 and the second control layer 140 has a twill weave structure. This provides better structural performance for either the first control layer 120 or the second control layer 140, ensuring good protection of the filter layer 130 during adhesive filtration or backwashing.

[0043] In some implementations, at least one of the first protective layer 110, the second protective layer 150, and the filter layer 130 has a plain weave structure. This reduces the complexity of the manufacturing process. When the filter layer 130 adopts a plain weave structure, the pore structure is more uniformly distributed, which can ensure filtration consistency and dust holding space.

[0044] In one application example, taking the flow of adhesive from the first protective layer 110 to the second protective layer 150 as an example; in the filter screen 100, the first protective layer 110 can be made of stainless steel wire with a diameter of 0.2mm in a plain weave, mainly to prevent larger particles from directly impacting the internal precision layers (such as the first control layer 120 or the filter layer 130); the first control layer 120 can be made of stainless steel wire with a diameter of 0.1mm in a twill weave, with a pore size smaller than the first protective layer 110, which can play the role of preliminary fine filtration and stabilizing the filter layer 130; the filter layer 130 The first control layer 140 can be made of stainless steel wire with a diameter of 0.35mm and woven in a plain weave. Its pore size is larger than that of the first control layer 120, and it undertakes the main filtration task. The larger wire diameter can provide higher support strength and dust holding space. The second control layer 140 can be made of stainless steel wire with a diameter of 0.07mm and woven in a twill weave. Its pore size can be set to be smaller to play a role in further fine filtration. The second protective layer 150 can be made of stainless steel wire with a diameter of 0.15mm and woven in a plain weave to protect the second control layer 140 from damage during backwashing or installation.

[0045] The backwashing mentioned above refers to rinsing in the opposite direction to the flow of the adhesive, which can clean the filter screen 100.

[0046] This application also provides an adhesive filter for the preparation of lyocell fibers. The adhesive filter includes at least one body, in which a filter screen 100 as described in the foregoing embodiments is installed. The first protective layer 110 of the filter screen 100 is close to the inlet side of the body, and the second protective layer 150 of the filter screen 100 is close to the outlet side of the body. That is, when the adhesive flows through the adhesive filter, the adhesive flows sequentially through the first protective layer 110, the first control layer 120, the filter layer 130, the second control layer 140, and the second protective layer 150 of the filter screen 100.

[0047] Since the adhesive filter includes the aforementioned filter screen 100, the adhesive filter has the same technical effects as the aforementioned filter screen 100, which will not be repeated here.

[0048] Other structures for adhesive filters can be implemented with reference to existing technologies, and will not be described in detail here.

[0049] For example, the adhesive filter can be a plunger filter.

[0050] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A filter screen for a glue filter, used in the preparation of lyocell fibers, characterized in that, The filter screen has a columnar structure and includes a first protective layer, a first control layer, a filter layer, a second control layer, and a second protective layer stacked sequentially along its height direction. The first protective layer, the first control layer, the filter layer, the second control layer, and the second protective layer are all metal woven mesh structures. The pore size of the filter layer is larger than that of the first control layer and also larger than that of the second control layer. The diameter of the metal wires in the filter layer is larger than that of the metal wires in the first control layer and also larger than that of the metal wires in the second control layer.

2. The filter screen according to claim 1, characterized in that, The diameter of the metal wires in the filter layer is greater than that of the metal wires in the first protective layer and also greater than that of the metal wires in the second protective layer.

3. The filter screen according to claim 2, characterized in that, The diameter of the metal wires in the first protective layer and the second protective layer is greater than the diameter of the metal wires in the first control layer and the second control layer.

4. The filter screen according to claim 3, characterized in that, Along the flow direction of the adhesive, the first protective layer is located upstream of the second protective layer, and the diameter of the metal wire in the first protective layer is larger than the diameter of the metal wire in the second protective layer.

5. The filter screen according to claim 1, characterized in that, Along the flow direction of the adhesive, the first control layer is located upstream of the second control layer, and the pore size of the first control layer is larger than that of the second control layer.

6. The filter screen according to any one of claims 1-5, characterized in that, The pore sizes of both the first protective layer and the second protective layer are larger than the pore size of the filter layer.

7. The filter screen according to any one of claims 1-5, characterized in that, At least one of the first protective layer, the first control layer, the filter layer, the second control layer, and the second protective layer is woven from stainless steel wire.

8. The filter screen according to any one of claims 1-5, characterized in that, At least one of the first control layer and the second control layer is a twill weave structure.

9. The filter screen according to any one of claims 1-5, characterized in that, At least one of the first protective layer, the second protective layer, and the filter layer has a plain weave structure.

10. A glue filter for the preparation of lyocell fibers, characterized in that, The adhesive filter includes at least one body, in which a filter screen according to any one of claims 1-9 is installed, wherein a first protective layer of the filter screen is close to the inlet side of the body, and a second protective layer of the filter screen is close to the outlet side of the body.

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