A gas permeable sheet structure with reduced pinholes
Patent Information
- Application Number
- CN202522375413.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-11-10
AI Technical Summary
[0003]有鉴于此，本实用新型提供的一种减少气孔的透气薄片结构，解决透气薄片因气孔导致强度下降、易破裂的问题，通过锥形透气孔与背面网格加强筋一体成型，兼顾高透气率与结构刚性
[0026]与现有技术相比较，本实用新型提供的一种减少气孔的透气薄片结构的有益效果是：本实用新型通过创新设计锥形通孔结构并配合加强筋结构和边缘封闭框的协同作用,从根本上解决了透气薄片结构气孔堵塞和结构变形的技术难题,锥形通孔的大端进小端出设计形成了明确的气流导向作用,光滑的锥面内壁有效降低了气流阻力和涡流现象,使得气体中的微小颗粒不易在孔道内沉积堆积从而保持透气孔的长期通畅性,加强筋结构在背面形成的网格状支撑系统显著提升了薄片本体的整体刚度和抗变形能力,即使在较大外力作用下也能保持平整状态确保透气孔形状稳定,边缘封闭框的L形包裹设计和凹槽卡接结构有效保护了边缘部位免受损伤并形成了完整的受力闭环系统,一体成型工艺消除了多部件连接的薄弱环节保证了结构的整体性和连续性,合理的尺寸比例设计在满足透气性能要求的同时优化了材料用量降低了制造成本,整体结构简洁紧凑易于加工制造和安装使用,相比现有技术具有透气效率高、抗堵塞性能强、结构稳定性好、使用寿命长和制造成本低等显著优势,特别适用于需要长期稳定透气性能的工业过滤、空气净化、医疗防护和建筑通风等应用场景。
Smart Images
Figure CN224796543U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of sheet structure technology, specifically, it relates to a breathable sheet structure with reduced porosity. Background Technology
[0002] In industrial production and daily life, breathable sheet structures are widely used in many fields such as air filtration, gas separation, ventilation, protective masks, and packaging materials. Traditional breathable sheets typically achieve their breathability by creating circular or square through-holes in a flat substrate. These through-holes vertically penetrate the sheet to form simple gas channels. However, in actual use, especially in environments with poor air quality or high humidity, the gas flows turbulently through these through-holes. Vortex areas and dead zones easily form inside the channels. When the gas carries dust, water vapor, or other fine particles, these particles will accumulate on the inner walls of the channels under the action of vortices, gradually reducing the pore size or even causing complete blockage. At the same time, existing breathable sheets are often made of thinner sheets in pursuit of a lightweight design. Such thin sheet structures are prone to bending under external pressure or their own weight. Deformation can alter the shape and size of the vents, further exacerbating the clogging problem. Due to a lack of effective reinforcement and protection, the edges of the sheet are prone to cracking, warping, or wear during handling, installation, and use. These edge damages gradually extend inwards, ultimately affecting the structural integrity and performance of the entire sheet. To address these issues, existing technologies have attempted several improvements. Some involve attaching reinforcing plates to the back of the sheet or using metal frames for external fixation. However, these methods increase structural complexity and manufacturing costs, and the bonded or mechanically connected areas can easily become new weak points. Other solutions increase the sheet thickness to improve strength, but this contradicts the need for lightweight applications and increases material consumption. Therefore, existing technologies still lack a simple, cost-effective, and efficient solution for breathable sheets that can effectively reduce vent clogging and maintain structural stability. Utility Model Content
[0003] In view of this, the present invention provides a breathable sheet structure with reduced pores, which solves the problem of reduced strength and easy breakage of breathable sheets due to pores. By integrally molding the conical vent holes with the back mesh reinforcement, it can achieve both high air permeability and structural rigidity.
[0004] This utility model is implemented as follows:
[0005] This utility model provides a breathable sheet structure with reduced porosity, including a sheet body, a vent array, a reinforcing rib structure, and an edge sealing frame. The sheet body is a rectangular flat plate structure. The vent array is distributed in the central area of the sheet body. The reinforcing rib structure is disposed on the back side of the sheet body. The edge sealing frame is disposed around the four edges of the sheet body. Each vent in the vent array is a conical through-hole structure. The large end opening of the conical through-hole is located on the front side of the sheet body, and the small end opening is located on the back side of the sheet body. The inner wall surface of the conical through-hole is a smooth conical shape. The reinforcing rib structure is composed of multiple intersecting ribs that extend longitudinally and laterally along the back side of the sheet body, forming a grid-like distribution area between adjacent ribs. The inner side of the edge sealing frame is tightly fitted and connected to the outer peripheral edge of the sheet body.
[0006] The technical effects of the breathable sheet structure with reduced pores provided by this utility model are as follows: By designing the vent holes as a conical through-hole structure with the large end opening on the front and the small end opening on the back, the gas flows in from the large end and out from the small end, forming a guiding effect, which effectively reduces the turbulence and eddy effect of gas in the channel, and reduces the problem of vent blockage caused by unstable airflow. At the same time, the smooth inner wall surface of the conical through-hole can reduce the gas flow resistance. The grid-like distribution area formed by the reinforcing rib structure on the back provides sufficient support strength to prevent the sheet body from deforming due to force during use. The tight fit of the edge closing frame ensures the structural stability of the edge of the sheet body and avoids edge warping or cracking.
[0007] Based on the above technical solution, the breathable sheet structure of this utility model with reduced porosity can be further improved as follows:
[0008] The ratio of the diameter of the large end opening to the diameter of the small end opening of the tapered through hole is 2 / 1 to 4 / 1, and the axis of the tapered through hole is perpendicular to the front side of the sheet body.
[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by limiting the ratio of the large end opening diameter to the small end opening diameter of the conical through hole to within the range of 2 / 1 to 4 / 1, it is ensured that the conical through hole has a suitable taper gradient. Too small a ratio will result in insufficient taper and failure to form an effective guiding effect, while too large a ratio will make the channel too narrow and increase airflow resistance. At the same time, the axis set perpendicular to the front of the sheet body ensures the straightness of the gas flow path and avoids the airflow deflection and energy loss that may be caused by the oblique channel, thereby optimizing the gas passage efficiency and further reducing the risk of pore blockage.
[0010] Furthermore, the distance between the center points of two adjacent air vents in the air vent array is greater than the large end opening diameter of a single air vent, and the air vent array is arranged in a uniform matrix.
[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting the distance between the center points of adjacent vents to be greater than the large end opening diameter of a single vent, a reasonable inter-vent isolation area is formed on the sheet body. This spacing design ensures that sufficient solid material is retained around each vent as a supporting structure, effectively avoiding the problems of insufficient inter-vent thin wall strength and structural instability caused by excessively small vent spacing. The uniform distribution of the matrix arrangement ensures that the air permeability of the entire sheet body surface is balanced and consistent, and there will be no phenomenon of excessively strong or weak local air permeability, thereby ensuring the stability and reliability of the overall performance.
[0012] Furthermore, the cross-section of the reinforcing rib in the reinforcing rib structure is trapezoidal, the width of the top edge of the rib is smaller than the width of the bottom edge of the rib, and the bottom edge of the rib is fixedly connected to the back of the sheet body.
[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the bottom edge of the rib and the back of the sheet body are integrally injection molded. The rib in the reinforcing rib structure adopts a trapezoidal cross-section design with the top edge width being smaller than the bottom edge width. This shape, which is narrower at the top and wider at the bottom, allows the rib to provide supporting strength while also possessing better bending and torsional stiffness. The fixed connection between the bottom edge of the rib and the back of the sheet body forms a large contact area, effectively dispersing stress concentration and preventing tearing or detachment at the connection between the rib and the sheet body under stress. The trapezoidal structure also facilitates demolding and processing, reducing the difficulty of manufacturing, while saving material and reducing the weight of the overall structure.
[0014] Furthermore, in the reinforcing rib structure, the longitudinally extending ribs and the transversely extending ribs interlock at their intersections, and the thickness of the ribs at the interlocking positions is the same as the thickness of the individual ribs.
[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the longitudinal and transverse extension ribs are connected by interlocking at the intersection, which significantly improves the structural strength at the intersection and avoids the problems of weak connection and stress concentration that may be caused by simple overlapping. The interlocking position maintains the same thickness design as the individual ribs, ensuring the flatness and uniformity of the entire reinforcing rib structure surface, preventing material waste and uneven stress distribution caused by local thickening. This interlocking structure also improves the overall rigidity of the reinforcing rib grid, so that the sheet body can more evenly transmit and distribute the load when subjected to external forces.
[0016] Furthermore, the cross-section of the edge-closed frame is L-shaped, with the vertical section of the L-shaped structure closely attached to the outer peripheral side of the sheet body, and the horizontal section of the L-shaped structure extending to the back of the sheet body and connecting to the end of the reinforcing rib structure.
[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The edge closing frame adopts an L-shaped cross-section structure design, in which the vertical section closely adheres to the outer periphery of the sheet body to form a lateral wrapping protection, effectively preventing damage to the edge of the sheet body caused by external impact or friction during use. The horizontal section extends to the back and connects with the end of the reinforcing rib structure, realizing the integrated combination of the edge closing frame and the reinforcing rib structure. This connection method forms a complete force system for the sheet body, the reinforcing rib structure and the edge closing frame, which greatly improves the overall structure's resistance to deformation and service life. At the same time, the L-shaped structure provides additional reinforcement at the corners to prevent cracking caused by stress concentration.
[0018] Furthermore, the inner side of the edge-closed frame is provided with a groove structure, the depth of which is 1 / 3 to 1 / 2 of the thickness of the edge-closed frame, and the outer peripheral edge of the sheet body is embedded in the groove structure to form a snap-fit relationship.
[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: a groove structure is set on the inner side of the edge closed frame and the outer peripheral edge of the thin sheet body is embedded in it to form a snap-fit relationship. This mechanical snap-fit method has higher connection reliability and structural stability than simple bonding or welding. The groove depth is set to 1 / 3 to 1 / 2 of the thickness of the edge closed frame, which not only ensures sufficient embedding depth to provide a stable snap-fit force, but also avoids excessive reduction of the wall thickness of the edge closed frame due to excessive groove depth, thus affecting its own strength. The snap-fit relationship also has a certain assembly tolerance absorption capacity, which can compensate for dimensional deviations in the manufacturing process and ensure assembly quality.
[0020] Furthermore, the sheet body, reinforcing rib structure, and edge closing frame are all integrally molded from polypropylene or polyethylene material.
[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By using polypropylene or polyethylene materials to manufacture the sheet body, reinforcing rib structure and edge closing frame through an integrated molding process, the connection gaps and weak joint surfaces that may occur during the assembly of multiple parts are eliminated. The integrated molding structure ensures the continuity of materials between each part, and the stress transmission is more uniform and smooth. Polypropylene and polyethylene materials have good chemical stability, corrosion resistance and processing performance, and are lightweight and easy to handle and install. The integrated molding process also simplifies the production process, reduces manufacturing costs and improves production efficiency, while ensuring the consistency and stability of product quality.
[0022] Furthermore, the thickness of the sheet body is 1 / 50 to 1 / 100 of the sheet body length, and the height of the ribs in the reinforcing rib structure is 2 to 5 times the thickness of the sheet body.
[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the thickness of the sheet body to 1 / 50 to 1 / 100 of its length, the sheet structure is ensured to have appropriate flexibility while maintaining sufficient rigidity. This avoids material waste and weight increase caused by excessive thickness, and also prevents insufficient strength and easy damage caused by excessive thinness. The height of the stiffeners in the reinforcing rib structure is set to 2 to 5 times the thickness of the sheet body. This height ratio allows the stiffeners to provide sufficient support without making the structure bulky due to excessive height or insufficient support due to excessive height. The reasonable configuration of the size relationship between the two achieves the optimal balance between structural strength and material usage.
[0024] Furthermore, the angle between the inner wall surface of the tapered through hole and the axis of the tapered through hole is 15° to 45°, and the vent array covers 40% to 70% of the total front area of the sheet body.
[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the angle between the inner wall of the conical through hole and the axis is set in the range of 15° to 45°. This angle range ensures the smooth flow of gas and avoids the excessive length of the channel and the increase of flow resistance caused by the angle being too small. It also prevents the weakening of the guiding effect and the phenomenon of airflow turbulence caused by the angle being too large. The ventilation hole array covers 40% to 70% of the total area of the front side of the sheet body. This coverage range ensures sufficient ventilation performance while maintaining the structural integrity and mechanical strength of the sheet body. Too low a coverage rate will lead to insufficient ventilation efficiency, while too high a coverage rate will weaken the structural strength. This ratio setting achieves a comprehensive optimization of ventilation performance and structural strength.
[0026] Compared with existing technologies, the beneficial effects of this utility model on a breathable sheet structure with reduced pores are as follows: This utility model fundamentally solves the technical problems of pore blockage and structural deformation in breathable sheet structures by innovatively designing a conical through-hole structure and coordinating the reinforcing rib structure and the edge sealing frame. The conical through-hole's design of large end inlet and small end outlet creates a clear airflow guiding effect. The smooth conical inner wall effectively reduces airflow resistance and eddy currents, making it difficult for tiny particles in the gas to accumulate in the channels, thus maintaining the long-term unobstructed flow of the pores. The grid-like support system formed by the reinforcing rib structure on the back significantly improves the overall rigidity and deformation resistance of the sheet body, ensuring its stability even under large external forces. The flat surface ensures stable vent shape, while the L-shaped wrapping design and grooved snap-fit structure of the edge sealing frame effectively protect the edge from damage and form a complete closed-loop stress system. The one-piece molding process eliminates weak links in the connection of multiple parts, ensuring the integrity and continuity of the structure. The reasonable size ratio design optimizes material usage and reduces manufacturing costs while meeting the requirements of breathability. The overall structure is simple and compact, easy to process, manufacture, install, and use. Compared with existing technologies, it has significant advantages such as high breathability efficiency, strong anti-clogging performance, good structural stability, long service life, and low manufacturing cost. It is particularly suitable for applications such as industrial filtration, air purification, medical protection, and building ventilation that require long-term stable breathability. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 An example diagram of a breathable sheet structure with reduced porosity;
[0029] Figure 2 A bottom view of a breathable sheet structure with reduced porosity;
[0030] Figure 3 A perspective view of a breathable sheet structure with reduced porosity;
[0031] The attached diagram lists the components represented by each number as follows:
[0032] 10. Thin sheet body; 20. Air vent array; 30. Reinforcing rib structure; 40. Edge closing frame; 41. Vertical section; 42. Horizontal section. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0034] like Figures 1-3 The diagram shows an example of a breathable sheet structure for reducing pores provided by this utility model. It includes a sheet body 10, a pore array 20, a reinforcing rib structure 30, and an edge-sealing frame 40. The sheet body 10 is a rectangular flat plate structure. The pore array 20 is distributed in the central region of the sheet body 10. The reinforcing rib structure 30 is located on the back side of the sheet body 10. The edge-sealing frame 40 surrounds the four edges of the sheet body 10. Each pore in the pore array 20 is a conical through-hole structure. The large end opening of the conical through-hole is located on the front side of the sheet body 10, and the small end opening is located on the back side of the sheet body 10. The inner wall of the conical through-hole has a smooth conical shape. The reinforcing rib structure 30 consists of multiple intersecting ribs extending longitudinally and laterally along the back side of the sheet body 10, forming a grid-like distribution area between adjacent ribs. The inner side of the edge-sealing frame 40 is tightly fitted and connected to the outer peripheral edge of the sheet body 10.
[0035] The specific operation or usage method is as follows: First, select a breathable sheet structure of appropriate specifications and dimensions according to the specific needs of the application scenario. Connect the edge sealing frame of the breathable sheet structure to the mounting frame or fixed bracket. Securely fix the edge sealing frame to the bracket using bolts or clips, ensuring that the front of the sheet body faces the direction of gas flow so that the large end opening of the conical through-hole is directly opposite the airflow. After fixing, check that the sheet body remains flat without obvious bending or twisting deformation. Start the ventilation or filtration system to allow gas to begin passing through the breathable sheet structure. The gas enters from the large end opening of the conical through-hole, is guided and accelerated by the conical channel, and exits from the small end opening, completing the ventilation process. During normal operation, the working status of the breathable sheet should be observed regularly. When inspecting the air vents, ensure they are clear and that the reinforcing ribs and edge sealing frame are intact. If the environment contains a lot of particulate matter or moisture, it is recommended to shorten the inspection cycle and clean the surface of the sheet if necessary. Use a soft brush or compressed air to blow from the front to the back, utilizing the guiding effect of the tapered holes to smoothly expel any adhering particles. Avoid using sharp objects to scrape the surface to prevent damage to the smooth inner walls of the tapered holes. For replacement, first stop the airflow, then remove the fixing parts of the edge sealing frame. Remove the old breathable sheet structure and install the new sheet structure in the reverse order. The entire operation is simple and quick, requiring no professional tools or special skills, and is suitable for a wide range of industrial and civilian applications.
[0036] In the above technical solution, the ratio of the large end opening diameter to the small end opening diameter of the tapered through hole is 2 / 1 to 4 / 1, and the axis of the tapered through hole is perpendicular to the front side of the sheet body 10.
[0037] Furthermore, in the above technical solution, the distance between the center points of two adjacent air holes in the air hole array 20 is greater than the large end opening diameter of a single air hole, and the air hole array 20 is arranged in a uniform matrix.
[0038] Furthermore, in the above technical solution, the cross-section of the rib in the reinforcing rib structure 30 is trapezoidal, the width of the top edge of the rib is smaller than the width of the bottom edge of the rib, and the bottom edge of the rib is fixedly connected to the back of the sheet body 10.
[0039] Furthermore, in the above technical solution, the longitudinally extending ribs and the transversely extending ribs in the reinforcing rib structure 30 are interlocked at the intersection, and the thickness of the ribs at the interlocking position is the same as the thickness of the individual ribs.
[0040] Furthermore, in the above technical solution, the cross-section of the edge-closed frame 40 is L-shaped, the vertical section 41 of the L-shaped structure is close to the outer peripheral side of the sheet body 10, and the horizontal section 42 of the L-shaped structure extends to the back of the sheet body 10 and connects to the end of the reinforcing rib structure 30.
[0041] Furthermore, in the above technical solution, the inner side of the edge-closed frame 40 is provided with a groove structure, the depth of which is 1 / 3 to 1 / 2 of the thickness of the edge-closed frame 40, and the outer peripheral edge of the sheet body 10 is embedded in the groove structure to form a snap-fit relationship.
[0042] Furthermore, in the above technical solution, the sheet body 10, the reinforcing rib structure 30, and the edge closing frame 40 are all integrally molded from polypropylene or polyethylene materials.
[0043] Furthermore, in the above technical solution, the thickness of the sheet body 10 is 1 / 50 to 1 / 100 of the length of the sheet body 10, and the height of the ribs in the reinforcing rib structure 30 is 2 to 5 times the thickness of the sheet body 10.
[0044] Furthermore, in the above technical solution, the included angle between the inner wall surface of the tapered through hole and the axis of the tapered through hole is 15° to 45°, and the air vent array 20 covers 40% to 70% of the total front area of the sheet body 10.
[0045] First embodiment: The sheet body dimensions are 200mm × 300mm × 1mm, made of food-grade polypropylene with a melt flow rate of 25g / 10min through injection molding. A 20×30 matrix arrangement of vent holes is used, with tapered through holes having a large end diameter of 2mm and a small end diameter of 0.7mm. The axis is perpendicular to the front, with the tapered surface forming a 20° angle with the axis, and the vent area occupies 55% of the front area. The back reinforcing ribs are 2mm high, trapezoidal ribs spaced 10mm apart, with a top edge diameter of 0.8mm and a bottom edge diameter of 1.4mm. The bottom edge has 40µm deep micro-serrations and is fused synchronously with the sheet body. The edge-sealing frame has an L-shaped cross-section, 2mm thick, with a 0.6mm deep groove on the inner side to secure the sheet around its perimeter, while simultaneously connecting to the rounded ends of the ribs. The entire assembly is glue-free and bolt-free.
[0046] This is a steam oven shelf liner. The liner needs to withstand continuous operation for 30 minutes in saturated steam at 120℃, a 500g food load, and frequent pulling and dropping impacts. This embodiment features a tapered hole with a large inlet and a small outlet to prevent condensation from dripping back, keeping the bread surface dry; the mesh ribs increase the flexural modulus of the 1mm thin liner to 1.8GPa, ensuring no permanent deformation after 10,000 repeated pulls and drops; the enclosed frame prevents grease from seeping in from the edges, allowing for direct dishwasher cleaning, and meeting food contact grade requirements for high temperature, high humidity, and high oil environments.
[0047] Second embodiment: The sheet body dimensions are 400mm×600mm×0.8mm, made of HDPE with a melt flow rate of 18g / 10min, integrally blow-molded and then hot-pressed. A 26×40 matrix arrangement of venting holes is used, with tapered through-holes 3mm at the large end and 1mm at the small end, the axis perpendicular to the front, the angle between the tapered surface and the axis being 35°, and the opening area occupying 65% of the front area. The back has reinforcing ribs 3mm high, longitudinal ribs spaced 15mm apart, and transverse ribs spaced 20mm apart, with 50µm deep triangular corrugations at the bottom edge of the ribs; the edge sealing frame is 2.5mm thick, with a 0.8mm deep groove on the inner side, connected to the rib ends by a 0.3mm thick transition rib; the overall weight is 180g.
[0048] The logistics turnover box features a foldable, breathable side wall. This side wall must withstand a cyclic temperature difference of -20℃ to 60℃, bear 15kg of fruits and vegetables, and withstand forklift drops. A large conical angle and high-density perforation array ensure timely removal of carbon dioxide from the box, delaying the ripening of fruits and vegetables. HDPE's low-temperature toughness prevents freezing cracking, and the mesh reinforcement gives the 0.8mm thin sheet a bending strength of 28MPa, allowing it to withstand a 500mm drop without cracking. The enclosed frame grooves quickly snap into place with the box frame, enabling assembly and disassembly in 5 seconds, meeting the requirements of high-frequency turnover, lightweight design, and foldable recyclability in cold chain warehousing.
[0049] Specifically, the principle of this invention is as follows: This invention uses a conical through-hole structure to replace the traditional cylindrical straight through-hole, based on the principle of gradually expanding and contracting tubes in fluid mechanics. When gas enters from the large end of the conical through-hole, the cross-sectional area of the channel gradually decreases, leading to a gradual increase in airflow velocity. According to Bernoulli's equation, the increased velocity causes a decrease in static pressure. This pressure gradient change guides and accelerates the airflow, causing the gas to flow directionally along the conical surface without generating irregular eddies or backflow. The increased airflow velocity also enhances the gas's self-cleaning ability; even if a small amount of particulate matter comes into contact with the hole wall, it will be carried away by the high-speed airflow and will not deposit. The smooth inner wall of the conical through-hole further reduces the frictional resistance between the airflow and the wall, reducing energy loss and improving air permeability. The reinforcing rib structure forms a grid-like distribution system on the back of the sheet body, based on the rib reinforcement principle in materials mechanics. By increasing the local cross-sectional moment of inertia, it improves the overall structural bending and torsional stiffness. The grid-like layout allows external loads to be transmitted and dispersed through multiple paths, avoiding stress... The trapezoidal cross-section design of the ribs, which are excessively concentrated at a certain location, provides a larger connection area at the rib roots. According to the shear stress distribution law, this design can effectively reduce the peak shear stress at the connection and prevent detachment failure. The interlocking connection of the longitudinal and transverse ribs forms an interlocking structure, which improves the overall collaborative working ability of the grid system. The L-shaped cross-section structure of the edge closed frame forms a closed rigid ring around the thin sheet. This rigid ring constrains the free deformation of the thin sheet edge. According to the plate and shell theory, the boundary constraint can significantly improve the critical instability load of the plate structure. The groove snap-fit method generates tensile and shear resistance through mechanical interlocking. This multi-constraint mechanism ensures the reliability of the edge connection. The one-piece molding process eliminates material interfaces and joint gaps between the parts. The continuous and uniform stress transmission conforms to the basic assumptions of continuous medium mechanics, avoiding the initiation of fatigue cracks caused by stress concentration. Through the comprehensive application of the above multiple technical principles, this utility model achieves the synergistic unity of optimized air permeability and improved structural strength, fundamentally solving the technical problems of pore blockage and structural deformation.
Claims
1. A breathable sheet structure with reduced porosity, comprising a sheet body, a permeable hole array, a reinforcing rib structure, and an edge-sealing frame, wherein the sheet body is a rectangular flat plate structure, the permeable hole array is distributed in the central region of the sheet body, the reinforcing rib structure is disposed on the back side of the sheet body, and the edge-sealing frame is disposed around the four edges of the sheet body, characterized in that... Each vent in the vent array is a conical through-hole structure. The large end of the conical through-hole is located on the front side of the sheet body, and the small end of the conical through-hole is located on the back side of the sheet body. The inner wall of the conical through-hole is a smooth conical shape. The reinforcing rib structure is composed of multiple intersecting ribs. The ribs extend longitudinally and laterally along the back side of the sheet body, and a grid-like distribution area is formed between adjacent ribs. The inner side of the edge closing frame is tightly connected to the outer peripheral edge of the sheet body.
2. The breathable sheet structure with reduced porosity according to claim 1, characterized in that, The ratio of the diameter of the large end opening to the diameter of the small end opening of the tapered through hole is 2 / 1 to 4 / 1, and the axis of the tapered through hole is perpendicular to the front side of the sheet body.
3. The breathable sheet structure with reduced porosity according to claim 2, characterized in that, The distance between the center points of two adjacent vents in the vent array is greater than the large end opening diameter of a single vent, and the vent array is arranged in a uniform matrix.
4. The breathable sheet structure with reduced porosity according to claim 3, characterized in that, The cross-section of the reinforcing rib in the reinforcing rib structure is trapezoidal, the width of the top edge of the rib is smaller than the width of the bottom edge of the rib, and the bottom edge of the rib is fixedly connected to the back of the sheet body.
5. The breathable sheet structure with reduced porosity according to claim 4, characterized in that, In the reinforcing rib structure, the longitudinally extending ribs and the transversely extending ribs interlock at their intersections, and the thickness of the ribs at the interlocking positions is the same as the thickness of the individual ribs.
6. The breathable sheet structure with reduced porosity according to claim 5, characterized in that, The cross-section of the edge-closed frame is L-shaped. The vertical section of the L-shaped structure is close to the outer peripheral side of the sheet body, and the horizontal section of the L-shaped structure extends to the back of the sheet body and connects to the end of the reinforcing rib structure.
7. The breathable sheet structure with reduced porosity according to claim 6, characterized in that, The inner side of the edge-closed frame is provided with a groove structure. The depth of the groove structure is 1 / 3 to 1 / 2 of the thickness of the edge-closed frame. The outer peripheral edge of the sheet body is embedded in the groove structure to form a snap-fit relationship.
8. The breathable sheet structure with reduced porosity according to claim 7, characterized in that, The sheet body, reinforcing rib structure, and edge closing frame are all integrally molded from polypropylene or polyethylene material.
9. A breathable sheet structure with reduced porosity according to claim 8, characterized in that, The thickness of the sheet body is 1 / 50 to 1 / 100 of the length of the sheet body, and the height of the ribs in the reinforcing rib structure is 2 to 5 times the thickness of the sheet body.
10. A breathable sheet structure with reduced porosity according to claim 9, characterized in that, The angle between the inner wall surface of the tapered through hole and the axis of the tapered through hole is 15° to 45°, and the array of vent holes covers 40% to 70% of the total front area of the sheet body.