Through-hole filter structure and method for manufacturing the same

Abstract

This invention discloses a through-hole filter structure and a method for manufacturing the same, and belongs to the field of filtration technology. The through-hole filter structure includes a filter sheet and support strips, the filter sheets are distributed at intervals in the thickness direction, the area between adjacent filter sheets is a filtration passage, the support strips are installed parallel to each other at intervals within the filtration passages, the support strips connect adjacent filter sheets, and the area between the support strips within the same filtration passage is a filter through-hole. This invention uses the support strips as a support structure and fixing structure for the filter sheet, eliminating the limitations of corrugated cardboard, reducing the number of adhesive positions, thereby reducing flow resistance, reducing the influence of adhesives on filtration performance, and improving filtration performance and yield.

Description

Cross-reference to related applications

[0001] This application claims priority to the Chinese Patent Application No. 202410472953.1, filed with the Chinese Patent Office on April 19, 2024, with the invention title "Through-hole filter structure and its manufacturing method", and the entire content thereof is incorporated herein by reference.

Technical Field

[0002] The present invention relates to filter technology, and particularly to through-hole filter structures and their manufacturing methods.

Background Art

[0003] Through-hole filters are generally used to adsorb chemical contaminants. Compared with ordinary filters, they have a straight-through flow path. The fluid passing through the through-hole filter can directly penetrate the filter from the straight-through flow path without forcibly passing through a medium layer with high resistance. Therefore, through-hole filters have the advantages of low resistance and high over-flow efficiency.

[0004] Currently, the most widely used through-hole filter is the corrugated cardboard filter, which includes a flat filter layer parallel to the through-holes and a corrugated support layer supporting between the flat filter layers. When manufacturing the corrugated cardboard filter, it is necessary to press the material and adhere it to a single-layer corrugated cardboard, selectively adhere different parts of the single-layer corrugated cardboard, laminate and solidify, and cut. The process is complicated and complex, and the yield rate is low.

[0005] In addition, the corrugated cardboard support layer used when manufacturing the corrugated cardboard filter can only install waveforms with sizes corresponding to the diameters of the through-holes, but there are strict limitations on the size of the waveforms. Usually, there are many bonding positions between the waveforms and the flat filter layer, and adhesives are relatively often used. The filter material is often coated with adhesives and loses its performance, which affects the filter performance and efficiency.

[0006] Therefore, problems such as high resistance, low yield rate, and complex processes all constrain the large-scale production and application of through-hole filters. How to improve these issues is a technical problem that those skilled in the art must face and solve. [Overview of the project] [Problems that the invention aims to solve]

[0007] The object of the present invention is to solve the problems of the prior art described above, and to provide a through-hole filter structure and a method for manufacturing the same that can use a support strip as a support structure and fixing structure for the filter sheet, eliminate the limitations of corrugated cardboard, reduce the number of adhesive positions, thereby lower flow resistance, reduce the influence of adhesive on filtration performance, and improve filtration performance and yield. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides the following solution.

[0009] The present invention provides a through-hole filter structure comprising a filter sheet and support strips, wherein the filter sheets are distributed with spacing in the thickness direction, the area between adjacent filter sheets serves as a filter passage, the support strips are installed parallel to each other with spacing within the filter passages, the support strips connect adjacent filter sheets, and the area between the support strips within the same filter passage serves as a filter through-hole.

[0010] Preferably, the support strips are provided at the same position on both the front and back surfaces of the filter sheet and are distributed in correspondence with the filter through-holes of the adjacent filter passages.

[0011] Preferably, the support strips are provided at different positions on both the front and back surfaces of the filter sheet, so that the filter through-holes of adjacent filter passages are distributed with a staggered position.

[0012] The filtration sheet preferably uses at least one of the following: filter paper containing an adsorbent, nonwoven fabric, cartridge cloth, foamed cotton, electret film, or polymer-coated electrode sheet.

[0013] The support strip is preferably made of at least one of EVA, EPDM, or a polymer material having hot-melt properties.

[0014] The present invention involves preparing a substrate having openings distributed in a matrix, and forming a filter sheet on both sides of the openings in the longitudinal direction of the substrate. A support strip is installed by coating, the support strip is parallel to the longitudinal direction of the substrate, has a first region between adjacent openings in the width direction of the substrate, has a second region between adjacent openings in the longitudinal direction of the substrate, and the support strip is located at the intersection of the first region and the second region. The support strip is pre-cooled to ensure its strength and stable dimensions, The present invention provides a method for manufacturing a through-hole filter structure, which includes reheating the support strip, corrugating the substrate, and forming a filter through-hole with the filter sheet and the opening.

[0015] It is preferable to use an entire filter sheet as the base material and to process the filter sheet to form the openings.

[0016] The process involves processing the bend lines located on both sides of the opening in the longitudinal direction of the base material, and it is preferable that the bend lines are intermittently connected dashed lines or continuously provided indented lines.

[0017] The substrate preferably includes an auxiliary strip and a filter sheet, wherein the auxiliary strip is installed parallel to the filter sheet, the filter sheet is distributed at intervals along the longitudinal direction of the auxiliary strip and is adhered to the auxiliary strip, and the area surrounded by the auxiliary strip and the filter sheet preferably functions as the opening.

[0018] The auxiliary strip is preferably made of at least one of the following: paper, nonwoven fabric, polymer mesh, film, or foamed cotton. [Effects of the Invention]

[0019] The present invention provides the following technical advantages over the prior art.

[0020] This invention uses support strips as both a support structure and a fixing structure for the filter sheet, and by rationally setting the spacing between the support strips, it is possible to form filter through-holes in cooperation with the filter sheet. Compared to conventional through-hole filters (vertical corrugated cardboard), the through-hole filter manufactured by this invention has the advantage of requiring less adhesive and having lower structural resistance. Under the same resistance standards, the effective material transfer area between the filter sheet and air is increased, improving filtration efficiency. In other words, this invention eliminates the limitations of corrugated cardboard, reduces the number of adhesive points, further reduces flow resistance, reduces the influence of adhesive on filtration performance, and can improve filtration performance and yield.

[0021] Other technical embodiments included in the present invention can also achieve the following technical effects.

[0022] This invention relates to a processing method for forming a through-hole filter by pressing a sheet-like material or using auxiliary strips for assistance, utilizing changes in the flexural modulus to guide the material to naturally bend at the desired position during corrugation, with support strips providing support and adhesion. The technical solution of this invention can be easily implemented using the above-described processing method, ultimately increasing the yield.

[0023] In the manufacture of conventional through-hole filters (vertical corrugated cardboard), it is necessary to go through many processes such as obtaining single-layer corrugated cardboard by pressing → applying an adhesive and stacking → curing → dividing, etc. In particular, in the cutting process, friction cutting is performed using a toothless belt cutter, the cross-section is prone to fluffing, the product resistance is high, and the yield rate is low. The present invention does not relate to many processes of traditional through-hole filters. The manufactured through-hole filter has the advantages of a short process, low cost, simple process, and high degree of automation. Moreover, the single sheet is cut by shearing instead of friction, the cross-section of the finished product is flat and not prone to fluffing, and furthermore, the resistance of the finished product filter is reduced. The present invention uses less adhesive, avoids the fluffing situation caused by cutting, has a high yield rate, and low structural resistance.

[0024] The present invention solves the problems of difficult cutting and complex process steps when manufacturing through-hole filters using sheet materials, can improve the manufacturing process of non-baffle filters in the prior art, expand the application of the adhesive coating and wave forming process commonly used for non-baffle filters, and can be converted into a through-hole filter manufacturing line by slightly modifying the manufacturing line of the conventional non-baffle filter. The process is mature and reliable, and through-hole filters can be efficiently produced.

[0025] Due to the characteristics of the hot melt adhesive line, the manufactured product has flexibility. Also, by applying the adhesive alternately on the front and back, the bending possibility of the product can be further enhanced. The through-hole filter of the present invention has lower resistance, more flexibility, and is easier to draw into a round shape than the existing through-hole filter (vertical corrugated cardboard). The problem that the filter efficiency decreases when the conventional through-hole filter curves is also solved.

[0026] Due to the material selection problem of the traditional IFD dust collection plate (plastic corrugated board), it has a large ventilation resistance. In the manufacturing process, printing → stacking → cutting of the heating wire is required. The technology is complicated. During the cutting process of the heater wire, uneven heat causes warping of the material, resulting in a low yield rate and slow production. Compared with the conventional IFD dust collection electrode, the present invention is not prone to warping, has a high yield rate, low structural resistance, fewer steps in the molding process, is easy to process, has a low cost, and has a high automation level.

[0027] To more clearly explain the technical solutions in the embodiments of the present invention or the prior art, the drawings that need to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Brief Description of the Drawings

[0028] [Figure 1] It is a schematic diagram of forming a base material by punching processing of the present invention. [Figure 2] It is a schematic diagram of the adhesive coating method with front and back alternation in FIG. 1. [Figure 3] It is a schematic diagram of forming a base material by pasting processing of the present invention. [Figure 4] It is a schematic diagram of the adhesive coating method with front and back alternation in FIG. 3. [Figure 5] It is a schematic diagram of the wave forming process of the base material using the adhesive coating method in FIG. 1 or FIG. 3. [Figure 6] It is a schematic diagram of the wave forming process of the base material using the adhesive coating method in FIG. 2 or FIG. 4. [Figure 7] It is a schematic diagram of the finished product formed in FIG. 5. [Figure 8] It is a schematic diagram of the finished product formed in FIG. 6.

Embodiments for Carrying Out the Invention

[0029] Hereinafter, the technical solutions in embodiments of the present invention will be clearly and completely described in relation to the drawings of the embodiments of the present invention. Clearly, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative work based on the embodiments of the present invention are within the scope of the protection of the present invention.

[0030] The object of the present invention is to provide a through-hole filter structure and a method for manufacturing the same that can solve the problems of the prior art, use a support strip as a support structure and fixing structure for the filter sheet, eliminate the limitations of corrugated cardboard, reduce the number of adhesive positions, thereby lower flow resistance, reduce the influence of adhesive on filtration performance, and improve filtration performance and yield.

[0031] To make the above-mentioned objectives, features, and advantages of the present invention clearer and easier to understand, the present invention will be described in more detail below, with reference to the drawings and specific embodiments.

[0032] As shown in Figures 1 to 8, the present invention provides a through-hole filter structure comprising a filter sheet 1 and a support strip 2. The filter sheet 1 has the function of adsorbing contaminants to the fluid flowing over its surface. The filter sheet 1 can be selected and processed from known materials. To improve mass transfer efficiency, the filter sheet 1 can be improved to disturb the airflow with pressed wave patterns or other forms. The support strip 2 itself has a certain spatial shape. By installing the support strip 2, the filter sheet 1 can be connected and, in combination with the filter sheet 1, can form filter through-holes 6. Specifically, the filter sheets 1 are distributed with spacing in their thickness direction, forming a parallel plate structure, and there is a corresponding spacing between the filter sheets 1, which is called the layer spacing. The depth of the filter through-holes 6 is called the thickness of the through-hole filter structure. The size of the layer spacing matches the width of the filter through-holes 6 in the longitudinal direction of the substrate, and the thickness of the through-hole filter structure matches the depth dimension of the filter through-holes 6 in the filter sheet 1. It is important to note that the size of the filter through-holes 6 cannot be enlarged indefinitely, otherwise it will affect the filtration effect, and it cannot be too small, otherwise it will increase the resistance of the fluid passing through the filter through-holes 6. Similarly, the thickness of the through-hole filter structure cannot be too small, otherwise it will affect the filtration effect, and it cannot be enlarged indefinitely, otherwise it will increase the resistance of the fluid passing through the filter through-holes 6. Therefore, it is necessary to rationally design the dimensions of the filter through-holes 6 through testing or simulation. The area between adjacent filter sheets 1 serves as a filtration passage, which is used for fluid flow, allowing the fluid to pass through the filter sheets 1 during fluid flow. Support strips 2 are installed parallel to each other within the filtration passage with gaps between them, and by dividing the filtration passage, the support strips 2 connect adjacent filter sheets 1, and the area between the support strips 2 within the same filtration passage forms a filter through-hole 6. That is, the filtration passage is divided into multiple filter through-holes 6, and each filter through-hole 6 forms a unit for fluid filtration.

[0033] In this invention, the support strips 2 serve as both a support structure and a fixing structure for the filter sheet 1. By rationally setting the spacing between the support strips 2, the filter through-holes 6 can be formed together with the filter sheet 1. Compared to conventional through-hole filters (vertical corrugated cardboard), the through-hole filter manufactured by this invention has the advantage of requiring less adhesive and having lower structural resistance. Under the same standards and equivalent resistance, the effective material transfer area between the filter sheet 1 and air increases, improving filtration efficiency. In other words, this invention eliminates the limitations of corrugated cardboard, reduces the number of adhesive points, further lowers flow resistance, reduces the influence of adhesive on filtration performance, and improves filtration performance and yield.

[0034] As shown in Figures 1, 3, 5, and 7, the support strip 2 can be provided at the same position on both the front and back surfaces of the filter sheet 1. After folding the filter sheet 1, the same positions on both the front and back surfaces of the filter sheet 1 are bonded together to form the finished product as shown in Figure 7. At this time, the filter through-holes 6 of adjacent filtration passages are distributed correspondingly, and the multiple filter through-holes 6 in the longitudinal direction of the base material are arranged sequentially in a straight line. In this type of structure, the shape of the filter through-holes 6 is basically fixed, so the deformation capability of the overall structure of the through-hole filter is equivalent to that of current cardboard-type filtration structures, and relatively flexible bending deformation cannot be achieved. However, the position supporting the support strip 2 can be rationally set as needed, and furthermore, elongated filter through-holes 6 can be formed to reduce resistance and ensure flow and filtration efficiency.

[0035] As shown in Figures 2, 4, 6, and 8, the support strips 2 can be installed at different positions on both the front and back surfaces of the filter sheet 1. The dashed lines in the figures represent the support strips 2 on the back surface. For example, one row in the longitudinal direction of the substrate can be installed entirely on the front surface, and all adjacent rows can be installed entirely on the back surface. During corrugation molding, the surface adhesive lines are bonded to each other, and the back adhesive lines are bonded to each other, forming the shape of the finished product as shown in Figure 8. At this time, the filter through-holes 6 of adjacent filtration passages are distributed with staggered positions, and the multiple filter through-holes 6 in the longitudinal direction of the substrate are arranged sequentially in a bent shape. In this type of structure, since the positions of the support strips 2 to which the filter through-holes 6 are connected are not relative and fixed, the filter through-holes 6 can exhibit rhomboid expansion deformation. The through-hole filter structure can achieve relatively flexible bending deformation, further increasing the bendability of the product and enhancing the adaptability of its structure.

[0036] Furthermore, the filter sheet 1 can use at least one of the following: filter paper containing an adsorbent, nonwoven fabric, carbon-filled cloth, foamed cotton, electret film, or polymer-coated electrode sheet. Various materials can be mixed and installed, and any combination of the materials listed above is a matter of adaptation and adjustment by those skilled in the art, and should all be within the scope of this invention. In addition, sheet-like materials such as textiles, nonwoven fabrics, paper, and films made using ferroelectric materials or materials that have obtained electret properties through post-processing can be processed using the processing method and products obtained by the processing of the present invention, and their properties can also be applied to dust collection electrodes, thus falling within the scope of protection of the present invention. Furthermore, dust collection electrodes manufactured by processing an electrode plate with an insulating polymer as described in the present invention are also within the scope of protection of the present invention.

[0037] The support strip 2 can be made of at least one of EVA, EPDM, or PO hot-melt polymer materials, and can be installed by mixing various materials. Similarly, any free combination of the materials listed above is a matter of adaptation and adjustment by those skilled in the art, and should all be within the scope of this application.

[0038] In conventional technology, when bonding the corrugated and flat layers of vertical corrugated cardboard, an adhesive must be applied. This adhesive covers the material surface, causing it to lose its adsorption capacity and rendering the performance at that location ineffective. As a result, vertical corrugated cardboard has a high adhesive density and a large area of ​​wasted space. In the parallel plate structure of the present invention, the area occupied by adhesive bonding is small, meaning that the area occupied by wasted space due to adhesive coating is small. For the same sheet thickness and the same perforation ratio, conventional corrugated cardboard has a higher area of ​​wasted space than conventional corrugated cardboard. Therefore, when not involved in turbulence generation, the present invention is superior to conventional corrugated cardboard. Furthermore, while conventional corrugated cardboard has few applications in manufacturing turbulence, the present invention can relatively flexibly adjust the shape of die-cut single-layer corrugated cardboard to increase turbulence and achieve the goal of improving efficiency. Its potential and post-adjustment space are also superior to conventional corrugated cardboard. As described above, the filtration efficiency of the present invention under equivalent specifications, equivalent materials, and equivalent resistance is due to conventional corrugated cardboard.

[0039] As shown again in Figures 1 to 8, the present invention also allows for the manufacture of the aforementioned through-hole filter structure using the aforementioned through-hole filter structure, and specifically provides a method for manufacturing a through-hole filter structure that includes the following.

[0040] The material is a sheet-like, elongated material used to manufacture the base material, which can be later folded to form a through-hole filter structure. When manufacturing the base material, it is necessary to either process the openings 3 into the base material or to form the openings 3 during the manufacturing process. The former can be done by punching, and the latter by splicing / wrapping. The prepared base material has openings 3 in a matrix distribution, and in the longitudinal direction of the base material, at least the base material on both sides of the openings 3 forms a filter sheet 1. After folding, the filter sheet 1 can be used as the wall surface of the filter through-hole 6 for filtration.

[0041] A support strip 2 is applied, and the support strip 2 must be parallel to the longitudinal direction of the substrate. After bending, it is parallel to the axial direction of the filter through-holes 6, i.e., the thickness direction of the through-hole filter structure. In the width direction of the substrate, there is a first region between adjacent openings 3, and in the longitudinal direction of the substrate, there is a second region between adjacent openings 3, and the support strip 2 is located at the intersection of the first region and the second region.

[0042] Pre-cool the support strip 2 to ensure its strength and stable dimensions.

[0043] The support strip 2 is reheated, and the base material is formed into a corrugated shape. During corrugation, the base material is folded alternately in forward and reverse directions to form the corrugated shape, and the base material after corrugation is formed, and the filter sheet 1 and the opening 3 are required to form the filter through-hole 6.

[0044] As shown in Figures 1 and 2, the substrate can be an entire filter sheet 1, and openings 3 can be formed on the filter sheet 1 by punching, laser cutting, wire cutting, etc., but of course, it is preferable to use a press-cutting method. Improvements that achieve an auxiliary wave-forming type by processing the filter sheet 1 with a larger number of openings 3, thereby reducing resistance and increasing the exposed area of ​​the sheet material, belong to conventional improvements to the structure of the present invention and should be included within the scope of protection of the present invention.

[0045] In a further proposal, the bending lines 4 can be processed so that they are located on both sides of the opening 3 in the longitudinal direction of the substrate. It should be noted that the bending lines 4 are parallel to the width direction of the substrate, and when corrugating the substrate, the process can be carried out along the bending lines 4, making it easier to bend at fixed positions, thereby ensuring and improving the yield of the through-hole filter structure. More specifically, the bending lines 4 can be intermittently connected dashed lines, or of course, continuous indentation lines or other forms can be used.

[0046] As shown in Figures 3 and 4, the substrate can include auxiliary strips 5 and filter sheets 1, in which case the filter sheet 1 is a cut strip sheet, and unlike the whole sheet described above, it requires joining / overlapping with the auxiliary strips 5. When manufacturing the substrate, the auxiliary strips 5 are arranged in parallel, the number and length of the auxiliary strips 5 are selected according to the width required for the through-hole filter structure, and the spacing between the auxiliary strips 5 is arranged according to the dimensional needs of the filter through-holes 6. The filter sheets 1 are distributed at intervals along the longitudinal direction of the auxiliary strips 5 and bonded to the auxiliary strips 5, and the spacing of the filter sheets 1 is set according to the dimensional requirements of the filter through-holes 6. The area enclosed by the arranged auxiliary strips 5 and filter sheets 1 is designated as openings 3, thus completing the manufacturing of the substrate. Improvements such as forming more openings 3 in the filter sheet 1 by combining the auxiliary strips 5 and filter sheets 1, thereby reducing resistance and increasing the exposed area of ​​the sheet material, belong to the conventional improvements to the structure of the present invention and should be included in the technical solutions of the present invention.

[0047] Furthermore, the auxiliary strip 5 may be made of at least one of the following: paper, nonwoven fabric, polymer mesh, film, or foamed cotton, and may be installed by mixing various materials. Any free combination of the materials listed above is considered an adaptation by a person skilled in the art and must be within the scope included in this application.

[0048] In accordance with the above description, the present invention provides the following specific embodiments that can be realized.

[0049] Example 1

[0050] The processing steps can be divided into 1) punching, 2) adhesive application, 3) pre-cooling and reheating, and 4) corrugation.

[0051] 1. Press

[0052] A rolled sheet material (the sheet material itself can be used as a filter sheet 1, i.e., it can perform a filtration function) is pressed to process it into a base material having openings 3. If the thickness of the sheet material itself is not considered, the dimensions of the openings 3 in the longitudinal direction of the sheet material (i.e., the base material) must be greater than or equal to the spacing between layers of the through-hole filter to be prepared, i.e., the dimensions of the openings 3 in this direction must be greater than or equal to the height of the filter through-holes 6 in the through-hole filter to be prepared. In order to make the sheet material easier to bend during corrugation, intermittently connected dashed lines must be pressed as fold lines 4 during punching, and two fold lines 4 on both sides of the same opening 3 form a pair, and the distance between the dashed lines within a group is the spacing between layers of the through-hole filter to be manufactured, the distance between groups, i.e., the thickness of the through-hole filter to be manufactured.

[0053] The dimension corresponding to the width direction of the sheet material of the opening 3 is, that is, the width of each filter through-hole 6 of the through-hole filter to be manufactured.

[0054] 2. Application of adhesive

[0055] Adhesive is applied to the substrate after die-cutting, and the adhesive can be applied intermittently. As shown in Figures 1 and 2, the adhesive can be applied to both the front and back surfaces. Two application methods are distinguished: one where the adhesive is applied to positions corresponding to the front and back surfaces, and another where the adhesive is applied intermittently with a staggered position on the front and back surfaces. The adhesive is applied to form an adhesive line, and the adhesive line is bonded to form a support strip 2. The function of the support strip 2 is to support and fix the through-hole filter. The height of the support strip 2 (or referred to as the adhesive application thickness) needs to be slightly higher than half the layer spacing to which the through-hole filter is to be manufactured. After the adhesive lines on both sides overlap, a certain pressing force is applied to reach the width of the layer spacing, thereby achieving even stronger adhesion.

[0056] 3. Pre-cooling, reheating

[0057] The pre-cooling of the bonding lines is done to obtain dimensional stability and strength during this process, while reheating imparts the ability of the bonding line surfaces to adhere to each other, making them easier to bond during the corrugation process.

[0058] 4, waveform shape

[0059] Referring to Figures 5 and 6, the corrugated sheets are formed with forward and reverse bending during the corrugation process. Note that the support strips 2 shown in Figures 5 and 6 are only in approximate positions and do not represent specific structural dimensions. Since the bending modulus of the sheet material is greatly reduced at the pressed dashed line positions (bending lines 4), the sheets are bent at the dashed line positions during corrugation, and thus the corrugation process can be carried out as expected.

[0060] Example 2

[0061] The processing steps can be divided into 1) applying adhesive to the auxiliary strip and pulling it, 2) attaching the sheet material, 3) applying adhesive, 4) pre-cooling and reheating, and 5) corrugation.

[0062] 1. Apply adhesive to the auxiliary strip and pull.

[0063] A thin paper with high tensile strength but low flexural modulus is selected, and a polymer film, net, or other material is used as an auxiliary strip 5. Adhesive is applied to it so that it can be attached and fixed to the sheet-like material (filter sheet 1), and then it is pulled.

[0064] 2. Application of sheet-like material

[0065] Long sheet materials are attached at equal intervals to the auxiliary strip 5 to which adhesive has been applied. If the thickness of the auxiliary strip 5, adhesive, and the sheet material itself is not taken into account, the length of the sheet material is the width of the through-hole filter, the width of the sheet material is the thickness of the through-hole filter, and the distance between the sheet materials is the layer spacing of the through-hole filter.

[0066] 3. Applying the adhesive

[0067] Referring to Figures 3 and 4, adhesive is applied to both the front and back surfaces. However, two types of application methods are distinguished: one where adhesive is applied to the corresponding positions on both the front and back surfaces, and another where adhesive is applied to the front and back surfaces with a slight offset, resulting in intermittent application. The role of the adhesive line is to support and fix the filter. Adhesive is applied to form the adhesive line, and the adhesive line is bonded to form the support strip 2. The function of the support strip 2 is to support and fix the through-hole filter. The height of the support strip 2 (or referred to as the adhesive application thickness) needs to be slightly higher than half the layer spacing to be used to create the through-hole filter. After the strips on both sides overlap, a certain pressing force is applied to reach the width of the layer spacing, thereby achieving even stronger adhesion.

[0068] 4. Pre-cooling, reheating

[0069] The pre-cooling of the bonding lines is done to obtain dimensional stability and strength during this process, while reheating imparts the ability of the bonding line surfaces to adhere to each other, making them easier to bond during the corrugation process.

[0070] 5, waveform shape

[0071] Referring to Figures 5 and 6, a wave with forward and reverse bending is formed during corrugation. Note that the support strip 2 shown in Figures 5 and 6 is only in an approximate position and does not represent the specific structural dimensions. The bending modulus of the auxiliary strip 5 is small, and the bending modulus of the corresponding position where the sheet material is attached is relatively large. Therefore, during corrugation, bending occurs at positions where the sheet material is not attached, and the support strip 2 formed by the adhesive line widens the interlayer distance, thereby manufacturing a through-hole filter.

[0072] Although the principles and embodiments of the present invention have been described using specific examples, the above description of examples is solely for the purpose of aiding in the understanding of the method and core concept of the present invention. At the same time, those skilled in the art will know that there are modifications in specific embodiments and scope of application based on the concept of the present invention. For this reason, the contents of this specification should not be understood as limitations on the present invention. [Explanation of Symbols]

[0073] 1: Filter sheet 2: Support strip 3: Open hole 4: Folding line 5: Helper Strip 6: Filter through-hole

Claims

1. A through-hole filter structure comprising a filter sheet and support strips, wherein the filter sheets are distributed with spacing in the thickness direction, the area between adjacent filter sheets serves as a filter passage, the support strips are installed parallel to each other with spacing within the filter passages, the support strips connect adjacent filter sheets, and the area between the support strips within the same filter passage serves as a filter through-hole.

2. The through-hole filter structure according to claim 1, characterized in that the support strip is provided at the same position on both the front and back surfaces of the filter sheet, and the filter through-holes of adjacent filter passages are distributed in a corresponding manner.

3. The through-hole filter structure according to claim 1, characterized in that the support strips are provided at different positions on both the front and back surfaces of the filter sheet, and the filter through-holes of adjacent filter passages are distributed with a staggered position.

4. The through-hole filter structure according to claim 1, characterized in that the filtration sheet uses at least one of the following: filter paper containing an adsorbent, nonwoven fabric, cartridge cloth, foamed cotton, electret film, and polymer-coated electrode sheet.

5. The through-hole filter structure according to claim 1, characterized in that the support strip is made of at least one of EVA, EPDM, and PO, which are polymer materials having hot-melt properties.

6. A substrate having openings distributed in a matrix is ​​prepared, and in the longitudinal direction of the substrate, the substrate on both sides of the openings is made into a filter sheet. A support strip is installed by coating, the support strip is parallel to the longitudinal direction of the substrate, has a first region between adjacent openings in the width direction of the substrate, has a second region between adjacent openings in the longitudinal direction of the substrate, and the support strip is located at the intersection of the first region and the second region. The support strip is pre-cooled to ensure its strength and stable dimensions, A method for manufacturing a through-hole filter structure according to any one of claims 1 to 5, characterized by reheating the support strip, corrugating the substrate, and having the filter sheet and the openings form a filter through-hole.

7. The method for manufacturing a through-hole filter structure according to claim 6, characterized in that the substrate is an entire filter sheet, and the filter sheet is processed to form the openings.

8. The method for manufacturing a through-hole filter structure according to claim 7, characterized in that the bending lines located on both sides of the opening in the longitudinal direction of the substrate are processed, and the bending lines are intermittently connected dashed lines or continuously provided indented lines.

9. The method for manufacturing a through-hole filter structure according to claim 6, wherein the substrate includes an auxiliary strip and a filter sheet, the auxiliary strip is installed parallel to the auxiliary strip, the filter sheet is distributed at intervals in the longitudinal direction of the auxiliary strip and is bonded to the auxiliary strip, and the region surrounded by the auxiliary strip and the filter sheet functions as the opening.

10. The method for manufacturing a through-hole filter structure according to claim 9, characterized in that the auxiliary strip is made of at least one of paper, nonwoven fabric, polymer mesh, film, and foamed cotton.

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