A perforated air guide plate for wet hydroentanglement drying and a working method thereof

Abstract

This invention discloses a perforated air guide plate for wet hydroentangled drying and its operating method. The air guide plate includes an upper air guide plate and a lower air guide plate, both of which are installed in an oven. The upper air guide plate is installed in the upper part of the oven, and the lower air guide plate is installed in the lower part of the oven. The unique penetrating design of this invention allows hot air to directly act on the surface of the material, greatly shortening the drying time and reducing energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of textile equipment technology, and more specifically, relates to a perforated air guide plate for wet hydroentanglement drying and its working method. Background Technology

[0002] In the production of spunlace nonwoven fabrics, after the fiber web is spun into fabric, although it is pressed and dehydrated by a rolling mill, the fabric still retains a large amount of moisture. Therefore, a drying process is necessary in the spunlace nonwoven fabric production process. Traditional processes often use hot air drying, which involves using hot air to dry the wet fabric on the conveyor belt surface. However, this drying method is often incomplete, resulting in poor drying of the nonwoven fabric and consequently compromising the product quality.

[0003] Existing patent document CN109140975A (A novel hot air circulating drying device for nonwoven fabric production, 2019.01.04) describes a drying heating box. The nonwoven fabric is distributed in an "S" shape on both sides of the heating box via upper and lower guide rollers, allowing the upper and lower surfaces of the nonwoven fabric to be heated multiple times inside the drying box. This facilitates rapid removal of moisture from the nonwoven fabric, improving drying efficiency. Simultaneously, the hot air can be recycled, reducing energy consumption. However, due to the "S" shape of the nonwoven fabric, to improve drying efficiency, multiple ceramic heating tubes need to be arranged inside the heating box and spaced apart between the nonwoven fabric sections. The hot air generated by these tubes dries the nonwoven fabric. In actual industrial production, the specific arrangement of the ceramic heating tubes and the nonwoven fabric often requires a larger heating box, which is not conducive to the optimal configuration of industrial space and production lines. Furthermore, this method has low thermal efficiency and results in a harder product feel.

[0004] Current hot air penetration dryers, such as the one described in "Application of Dryers in the Production of Spunlace Nonwoven Fabrics" in the 9th issue of "National Defense Textile Guide" in 2005, by Liu Dongsheng, Donglun Technology Industry Co., Ltd. (China), employ a penetration drying method. In this method, as the spunlace fabric passes through the drying drum hood, the honeycomb structure on the drum surface allows a vacuum suction system inside the drum to draw hot steam through the fabric and remove it. The moisture on the fabric evaporates and is carried away with the hot air drawn into the drum. The extracted air is then sent to a circulation system to remove moisture, reheated by a heat exchanger, and then sent back to the drying hood. Practical experience has shown that the hot steam penetration drying method has significantly higher thermal efficiency than other hot air drying methods, resulting in a better hand feel. However, in actual production, a continuous supply of hot steam is still required, leading to high energy consumption. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to overcome the shortcomings of the prior art and provide a perforated air guide plate for wet hydroentangling drying and its working method.

[0006] Technical solution: The present invention provides a perforated air guide plate for wet hydroentangling drying, comprising an upper air guide plate and a lower air guide plate, both of which are installed in an oven, wherein the upper air guide plate is installed in the upper part of the oven and the lower air guide plate is installed in the lower part of the oven.

[0007] In some embodiments, both the upper and lower air guide vanes are made of stainless steel with a thickness of 1.5 to 2.0 mm and a hydrophobic and corrosion-resistant surface.

[0008] In some embodiments, both the upper and lower air guide plates are provided with a plurality of through holes, and the positions of the through holes in the upper and lower layers correspond to each other. The hole diameter is 15~20mm, and the hole spacing is 2.5~3 times the hole diameter.

[0009] In some embodiments, the air guide plate between two adjacent rows of holes in the upper air guide plate has a streamlined raised structure. The streamlined raised structure is folded downward at 42.5~65mm intervals in the lateral direction, and the width is 15~20mm.

[0010] In some embodiments, the upper air guide vane is installed at an angle of 10° to 15°, with its lower end directly connected to the air guide groove.

[0011] In some embodiments, the lower air guide vane is installed horizontally.

[0012] On the other hand, the present invention also discloses a method for operating a perforated air guide plate for wet hydroentangling drying, comprising:

[0013] After being dehydrated by negative pressure in the previous stage, the wet spunlace nonwoven material that needs to be dried enters the hot air penetration drying system at a design speed of 5-200 meters per minute. It is fed into the drying oven drum and drying screen by the guide roller group. The wrap angle of the wet spunlace nonwoven material to the drying oven drum and drying screen is 110°~150°.

[0014] The coordinated action of the circulating fan (hot air exhaust fan) and the burner / oven supply air circulating fan creates a gradient pressure distribution zone where the internal pressure of the rotary drum drying screen is lower than the external pressure. This causes the wet-spunlace nonwoven material to be adsorbed onto the surface of the rotary drum drying screen. The supplied air, heated by the burner and oven supply air circulating fan, passes from bottom to top through the lower guide vane, the wet-spunlace nonwoven material, and the lower half of the rotary drum drying screen, before most of it enters the interior of the rotary drum drying screen. At this point, some of the moisture in the material is carried away, and the hot air temperature drops from 110°~130° to 80°~100°, while the humidity increases from 10%~20% to over 65%. This hot and humid air is no longer suitable for the material. Drying requires the use of a hot air exhaust fan to expel air from the drying system. After external air-water separation and filtration, the air is reintegrated into the air supply system. The drier, hot air continues to circulate within the system, while the humid air that doesn't enter the hot air exhaust fan rises around the drum's hot air baffle to the upper guide vane. Moisture condenses on the streamlined protrusions of the upper guide vane and is discharged downwards due to the inclined angle of the installation. The humid air, with its humidity reduced to 30%–40%, is then expelled from the drying system by the hot air exhaust fan at the top of the mechanism. After further external air-water separation and filtration, it is reintegrated into the air supply system, thus saving energy. The drum baffle is installed inside the upper half of the oven's circular mesh. Its function is to seal the hot airflow, creating effective hot air circulation. The sealed part of the baffle is a non-working surface, and its wrap angle with the drum mesh must match the wrap angle of the wet-spunlace nonwoven material with the drum mesh.

[0015] In addition to the aforementioned functions of permeable airflow, condensation, and moisture removal, the upper and lower permeable airflow guide vanes also have an airflow rectification effect, enabling hot air to penetrate the wet-spunlace nonwoven material vertically, uniformly, and orderly, causing the material's moisture to evaporate rapidly. The burner and oven air supply and exhaust fans work together to ensure that some of the hot air is carried away and discharged outside the machine, while some is circulated, allowing the drying system to operate continuously and orderly, and to continuously complete the drying process.

[0016] The drying section on the production line consists of several drying units as described above. When the wet spunlace nonwoven material passes around the working surface of a rotating drum drying screen and has not yet reached the expected moisture regain, the material sequentially enters the next drying unit and at the same time changes the contact surface between the material and the working surface of the rotating drum drying screen. After multiple alternating drying on both sides, the material is sent out and wound up by the guide roller at the outlet when the moisture regain reaches the winding standard.

[0017] Beneficial effects: The beneficial effects of this invention are as follows:

[0018] (1) The air guide plate of the present invention has a horizontally adjacent two rows of holes on the upper perforated air guide plate. The air guide plate is raised in a streamline shape and installed at an inclination of 10°~15°. The lower end is directly connected to the air guide groove to ensure smooth airflow and timely discharge of condensate.

[0019] (2) The drying system of the present invention adopts a penetrating structure design, which allows hot air to act directly on the surface of the material, greatly shortening the drying time and reducing energy consumption.

[0020] (3) The drying system of the present invention optimizes the hot air circulation system, ensures uniform temperature distribution inside the oven, and achieves uniform drying, thereby improving product quality. It is expected that the thermal efficiency of the new system will increase by 20%, production efficiency by 30%, and product qualification rate by 5%. At the same time, the energy consumption of the oven will be reduced by 20%, and the production cost will be reduced accordingly.

[0021] (4) The drying system of the present invention has a wall frame consisting of a frame, inner and outer panels and an intermediate insulation layer. The frame and inner and outer panels are made of stainless steel. The frame is an I-beam structure. The panel thickness is 0.8~1.2mm. The outer surface is smooth and the inner surface is hydrophobic and corrosion-resistant. The intermediate insulation layer is a fiberglass / rock wool composite needle-punched felt, wherein the fiberglass has a fineness of 10~25μm, a length of 51~76mm and a content of 60%~80%, and the rock wool has a fineness of 7~15μm, a length of 51~76mm and a content of 20%~40%. The two fibers are opened and mixed and then air-flowed to form a net and needle-punched composite. The single-layer density of the composite felt is 1000~1500g / m². 2 The thickness is 30~40mm. During assembly, 3~4 layers are used to composite according to the heat insulation requirements. The thickness after composite is controlled at 90~130mm to maintain a reasonable air stillness layer.

[0022] (5) The drying system of the present invention uses a servo motor drive to prevent the oven from stopping due to fabric breakage, thus improving production efficiency; at the same time, the oven intelligent control system can set and adjust drying parameters according to the characteristics of different materials to achieve precise control and reduce energy consumption. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an oven (drying system) according to an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the oven wall structure according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the upper airflow guide vane structure according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the lower airflow guide vane structure according to an embodiment of the present invention;

[0027] Figure 5 This is a side sectional view of the upper airflow guide vane according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the inclined installation of the upper air guide vane according to an embodiment of the present invention. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship shown, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0033] Example 1

[0034] In each drying unit of the drying system, perforated air guide vanes are typically installed at the top and bottom, respectively referred to as the upper and lower air guide vanes. The lower air guide vane is located near the system's air outlet, where the air moisture content is very low, preventing condensation. A conventional perforated air guide vane can be used here, made of stainless steel with a thickness of 1.5~2.0mm and a hydrophobic, corrosion-resistant surface. The vane has evenly spaced perforations perpendicular to its surface, with a hole diameter of 15~20mm and a hole spacing of 2.5~3 times the hole diameter. Figure 4 As shown, the upper perforated air guide plate is close to the system's air outlet, where the air has a high moisture content, which will produce condensation. Using a conventional perforated air guide plate results in slow dehydration and low drying efficiency, necessitating the design and development of a new structure.

[0035] like Figure 1 , Figures 3 to 6 As shown, a perforated air guide plate for wet hydroentangling drying includes an upper air guide plate 2 and a lower air guide plate 6. Both the upper air guide plate 2 and the lower air guide plate 6 are installed in an oven, wherein the upper air guide plate 2 is installed in the upper part of the oven and the lower air guide plate 6 is installed in the lower part of the oven.

[0036] In this embodiment, as Figure 3 and Figure 4 As shown, the upper air guide plate 2 and the lower air guide plate 6 are both made of stainless steel with a thickness of 1.5~2.0mm. The surfaces are both hydrophobic and corrosion resistant. The upper and lower air guide plates are aligned and perforated with a hole diameter of 15~20mm and a hole spacing of 2.5~3 times the hole diameter.

[0037] Furthermore, in order to ensure that water accumulated on the upper air deflector is discharged in a timely manner, such as... Figure 3 As shown, the upper air guide vane 2 includes a first plate 21 with a plurality of first through holes 22 distributed on it. The air guide vane between two adjacent rows of first through holes 22 on the first plate 21 has a streamlined raised structure 23. The first plate 21 is installed at an angle of 10°~15°, with its lower end directly connected to the air guide groove to ensure smooth airflow and timely drainage of condensate. The upper air guide vane 2 is located near the system outlet, where the air has a high moisture content, which will generate condensate. Using a conventional perforated air guide vane results in slow dehydration and low drying efficiency; therefore, an inclined structure is required.

[0038] Specifically, the first plate 21 is made of stainless steel with a thickness of 1.8~2.2mm. Its surface is hydrophobic and corrosion-resistant, and it has a streamlined protrusion, 15~20mm wide, pressed downwards at intervals of 42.5~65mm in the transverse direction. Figure 5 As shown. Fix the folded panel onto the frame, ensuring the angle 25 between the streamlined protrusion and the horizontal plane 24 is 10°~15°, as shown. Figure 6 As shown. Each streamlined raised structure 23 is an inclined condensate drainage channel, with its lower end directly connected to the guide groove to ensure smooth airflow and timely drainage of condensate. Perforations are evenly drilled on the vertical and horizontal plane of the plate, with the hole diameter controlled at 15~20mm according to the horizontal dimensions. The first through hole 22 is located in the center of two adjacent streamlined raised structures and is aligned with the perforation position on the lower perforated guide air plate.

[0039] In this embodiment, as Figure 4As shown, the lower air guide plate 6 is located near the system's air outlet, where the air moisture content is very low, preventing condensation. A conventional perforated air guide plate can be used. The second plate 61 is made of stainless steel with a thickness of 1.5~2.0mm and a hydrophobic, corrosion-resistant surface. Second through holes 62 are evenly spaced vertically through the plate, with a diameter of 15~20mm and a spacing of 2.5~3 times the hole diameter.

[0040] In this embodiment, the upper and lower air guide plates are specifically installed in the oven (drying system) structure as follows: Figure 1 As shown, the drying system includes a wall frame 1, a heat circulation compensation and adjustment device 4, and a circulating fan. The wall frame 1 is equipped with an upper air guide plate 2, a rotating drum drying screen 5, and a lower air guide plate 6.

[0041] The upper air guide plate 2 is located above the rotary drum drying screen 5, the lower air guide plate 6 is located below the rotary drum drying screen 5, and the heat circulation compensation adjustment device 4 is respectively installed at the inlet and outlet of the drying oven.

[0042] In this embodiment, in order to improve the heat preservation effect, such as Figure 2 As shown, the wall frame 1 includes a frame, an outer panel 11, an inner panel 13, and an intermediate insulation layer 12. The intermediate insulation layer 12 adopts a fiberglass / rock wool composite needle-punched felt structure.

[0043] Furthermore, the frame is an I-beam structure, and the frame, outer panel 11 and inner panel 13 are all made of stainless steel. The outer surface is smooth and the inner surface is hydrophobic and corrosion-resistant. The thickness of the outer panel 11 and inner panel 13 is 0.8~1.2mm.

[0044] Furthermore, in the intermediate insulation layer 12, the glass fiber has a fineness of 10~25μm, a length of 51~76mm, and a content of 60%~80%, while the rock wool fiber has a fineness of 7~15μm, a length of 51~76mm, and a content of 20%~40%. After the two types of fibers are loosely mixed, they are air-laid into a mesh and needle-punched composite. The single-layer density of the composite felt is 1000~1500g / m². 2 The thickness is 30~40mm. During assembly, 3~4 layers are used in combination according to the heat insulation requirements. After the combination, the thickness of the middle insulation layer is controlled at 90~130mm to maintain a reasonable air quiescent layer.

[0045] In this embodiment, as Figure 1 As shown, the rotary drum drying mesh 5 is a direct-acting component of the hot air penetration drying system used in wet hydroentangling. It is cylindrical, located in the center of the oven, and is made of a high thermal conductivity nickel-chromium alloy mesh with 17-20 mesh openings. The material to be dried is arranged in a wavy pattern, tightly adhering to the surface of the rotary drum drying mesh 5 and passing around it sequentially. The heated hot air enters from the periphery of the rotary drum drying mesh 5, first passing through the material to be dried, and then through the rotary drum drying mesh 5 into the interior.

[0046] In this embodiment, as Figure 1 As shown, the system also includes a rotary drum hot air baffle 3, which is fixed to the upper part of the rotary drum drying mesh 5. It has a semi-circular structure, is made of stainless steel, and has a thickness of 2.0~3.0mm. The main function of the rotary drum hot air baffle 3 is to deliver the hot air, heated by the hot air furnace, into the drying zone according to a predetermined direction, working temperature, and airflow, thereby completing the drying of the material.

[0047] In this embodiment, as Figure 1 As shown, the heat circulation compensation adjustment device 4 is installed at the inlet and outlet of the oven. The heat circulation compensation adjustment device 4 adopts a mature PLC control system to improve the automation level and ease of operation of the oven.

[0048] In this embodiment, the circulating fan includes a hot air exhaust circulating fan 7 and a burner and oven supply air circulating fan 8. The hot air exhaust circulating fan 7, driven by an electric motor, rotates its blades to generate a negative pressure effect, drawing in the hot, humid air passing through the rotating drum drying screen 5 and discharging it through the exhaust port into the steam-water separator. The separated and filtered recovered hot air is then reintroduced into the air supply system to save energy. Figure 1 As shown, the hot air exhaust circulation fan 7 includes two fans, one of which is installed inside the rotary drum drying screen 5 and the other is installed outside the drying oven.

[0049] The burner and oven air circulation fan 8 are components of the air supply system. The oven burner uses natural gas for direct combustion heating. The air added consists of two parts: fresh air supplied from the outside and heated recovered hot air. The heated hot air is sent into the drying zone by the oven air circulation fan through the lower guide vane 6.

[0050] Example 2

[0051] A method for manufacturing a perforated air guide plate for wet hydroentangling drying, comprising:

[0052] Combination Figure 1 The wet spunlace nonwoven material requiring drying is dehydrated under negative pressure in the preceding stage and then enters the hot air penetration drying system at a designed speed of 5-200 meters per minute. It is fed into the drying drum and drying screen 5 by guide rollers. The wrap angle between the wet spunlace nonwoven material and the drying drum and drying screen 5 is 110°~150°. From a drying efficiency perspective, a larger wrap angle results in higher efficiency. However, the wet strength of the wet spunlace nonwoven material must also be considered. For materials with high wet strength, the wrap angle with the drying drum and drying screen 5 can even be increased to 180°. However, for materials with low wet strength, such as easily pulverized wet wipes, the wrap angle with the drying drum and drying screen 5 must be smaller; otherwise, the material will break and cannot operate continuously.

[0053] The hot air exhaust circulating fan 7 and the burner and oven supply air circulating fan 8 work in coordination to form a gradient pressure distribution zone where the internal pressure of the rotary drum drying screen 5 is lower than the external pressure. This causes the wet spunlace nonwoven material to be adsorbed onto the surface of the rotary drum drying screen 5. The supplied air, heated by the burner and oven supply air circulating fan 8, passes from bottom to top through the lower guide vane 6, the wet spunlace nonwoven material, and the lower half of the rotary drum drying screen 5, before most of it enters the interior of the rotary drum drying screen 5. At this point, some of the moisture in the material is carried away, and the hot air temperature drops from 110°~130° to 80°~100°, while the humidity increases from 10%~20% to over 65%. This humid and hot air is no longer suitable for drying the material and needs to be discharged from the drying system by the hot air exhaust circulating fan 7. After external air-water separation and filtration, it is then reintroduced into the system. The air supply system circulates relatively dry, hot air, while the humid, hot air that doesn't enter the hot air exhaust fan 7 rises above the drum hot air baffle 3 to the upper guide vane 2. Moisture condenses on the streamlined ridges of the upper guide vane 2 and is discharged downwards due to the inclined angle. The humid, hot air, with humidity reduced to 30%–40%, is discharged from the drying system by the hot air exhaust fan 7 at the top of the mechanism. After further external air-water separation and filtration, it re-enters the air supply system to save energy. The drum baffle 3 is installed inside the upper half of the oven's circular mesh, its function being to seal the hot airflow and create effective hot air circulation. The baffle sealing part is a non-working surface, and its wrap angle with the drum drying mesh 5 must match the wrap angle of the wet-spunlace nonwoven material with the drum drying mesh 5.

[0054] In addition to the aforementioned functions of permeating airflow, condensing and removing moisture, the upper and lower guide vanes 2 and 6 also have an airflow rectification effect, allowing hot air to penetrate the wet-spunlace nonwoven material vertically, uniformly, and orderly, causing the material's moisture to evaporate rapidly. The burner and oven air supply circulation fan 8 and the hot air exhaust circulation fan 7 work together to ensure that part of the hot air is carried away and discharged outside the machine, while the rest is circulated, ensuring the drying system operates continuously and orderly, and continuously completing the drying process.

[0055] The drying section of the production line consists of several drying units as described above. When the wet-laid spunlace nonwoven material passes over the working surface of a rotating drum drying screen 5 and has not yet reached the expected moisture regain, the material sequentially enters the next drying unit, simultaneously changing the contact surface between the material and the working surface of the rotating drum drying screen 5. This process is repeated multiple times with alternating front and back drying until the material's moisture regain reaches the winding standard. At this point, the material is fed out and wound up by the guide roller at the fabric outlet. The structures of each drying unit are basically similar, but the drying temperature and exhaust speed are configured in a gradient. That is, the drying unit that first contacts the material has a higher temperature and a faster exhaust speed, while the temperature and exhaust speed of subsequent drying units gradually decrease. The overall gradient design should conform to the drying curve, which is beneficial for improving drying efficiency and saving energy.

[0056] This invention discloses a perforated air guide plate for wet hydroentangled drying. Its unique penetrating design allows hot air to directly act on the material surface, significantly shortening drying time and reducing energy consumption. The innovative design of the oven's internal structure and optimized hot air circulation system ensure uniform temperature distribution and drying, improving product quality. The new system is expected to increase thermal efficiency by 20%, production efficiency by 30%, and product qualification rate by 5%. Simultaneously, oven energy consumption will be reduced by 20%, resulting in a corresponding decrease in production costs. Servo motor drive eliminates downtime caused by fabric breakage, further improving production efficiency. Utilizing the oven's intelligent control system, drying parameters can be set and adjusted according to the characteristics of different materials, achieving precise control and reducing energy consumption.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A drying system for wet hydroentangling drying using a perforated air guide plate, characterized in that: It includes an upper air guide plate (2) and a lower air guide plate (6), both of which are installed in the oven. The upper air guide plate (2) is installed in the upper part of the oven, and the lower air guide plate (6) is installed in the lower part of the oven. The drying system also includes a circulating fan and a rotary drum drying screen. The upper guide vane (2) is located above the rotary drum drying screen, and the lower guide vane (6) is located below the rotary drum drying screen. The circulating fan includes a hot air exhaust circulating fan and a burner and oven air supply circulating fan. The hot air exhaust circulating fan includes two fans, one of which is installed inside the rotary drum drying screen and the other is installed outside the oven. The upper air guide plate (2) and the lower air guide plate (6) are both made of stainless steel with a thickness of 1.5~2.0mm and a hydrophobic and corrosion-resistant surface. The upper air guide plate (2) and the lower air guide plate (6) are provided with several through holes, and the positions of the through holes in the upper and lower layers correspond to each other. The hole diameter is 15~20mm and the hole spacing is 2.5~3 times the hole diameter. The upper guide vane (2) has a streamlined raised structure (23) between the two adjacent rows of holes in the lateral direction. The streamlined raised structure (23) is folded downwards at intervals of 42.5~65mm in the lateral direction, and has a width of 15~20mm. The upper guide vane (2) is installed at an angle of 10°~15°, and the lower end is directly connected to the guide groove. The lower guide vane (6) is installed horizontally.

2. The working method of a drying system for wet hydroentangling drying using a perforated air guide plate according to claim 1, characterized in that: include: After being dehydrated by negative pressure in the previous stage, the wet spunlace nonwoven material that needs to be dried enters the hot air penetration drying system at a design speed of 5-200 meters per minute. It is fed into the drying oven drum drying screen (5) by the guide roller group. The wrap angle of the wet spunlace nonwoven material to the drying oven drum drying screen (5) is 110°~150°. The hot air exhaust circulating fan (7) and the burner and oven air supply circulating fan (8) work together to form a gradient pressure distribution zone where the internal pressure of the rotary drum drying screen (5) is lower than the external pressure, so that the wet spunlace nonwoven material is adsorbed on the surface of the rotary drum drying screen (5). After being heated by the burner and oven air supply circulating fan (8), the air passes from bottom to top through the lower guide air plate (6), the wet spunlace nonwoven material, and the lower half of the rotary drum drying screen (5), and most of it enters the interior of the rotary drum drying screen (5). At this time, some of the moisture in the material is carried away, the hot air temperature drops from 110°~130° to 80°~100°, and the humidity increases from 10%~20% to more than 65%. This hot and humid air is no longer suitable for drying the material and needs to be discharged from the drying system by means of the hot air exhaust circulating fan (7). After being separated and filtered by external air-water separation, it is re-integrated into the air supply system. The air system, while the drier hot air continues to circulate in the system, the other part of the humid hot air that does not enter the hot air exhaust circulation fan (7) will bypass the drum hot air baffle (3) and rise to the upper guide air plate (2). The moisture will condense on the streamlined ridge of the upper guide air plate (2) and be discharged to the lower end under the action of the installation tilt angle. The humid hot air with the humidity reduced to 30%~40% is discharged from the drying system by the hot air exhaust circulation fan (7) at the top of the mechanism. After being separated and filtered by external air and water, it will be reintegrated into the air supply system to save energy. The oven drum baffle (3) is installed on the upper half of the oven circular mesh. Its function is to seal the hot air flow and form an effective circulation of hot air. The baffle sealing part is a non-working surface. Its wrap angle with the drum drying mesh (5) should match the wrap angle of the wet spunlace nonwoven material with the drum drying mesh (5). In addition to allowing airflow to pass through, condensing and removing moisture, the upper guide vane (2) and the lower guide vane (6) also have the function of airflow rectification, so that hot air can penetrate the wet spunlace nonwoven material vertically, uniformly and orderly, and the moisture of the material can evaporate quickly; the burner and oven air supply circulation fan (8) and hot air exhaust circulation fan (7) work together to ensure that part of the hot air is taken away and discharged outside the machine, while part is circulated, so that the drying system can run continuously and orderly and continuously complete the drying function; The drying section on the production line consists of several drying units. When the wet spunlace nonwoven material passes around the working surface of a rotating drum drying screen (5) and has not yet reached the expected moisture regain, the material enters the next drying unit in sequence and at the same time changes the contact surface between the material and the working surface of the rotating drum drying screen (5). After multiple alternating drying on the front and back sides, the material is sent out and wound up by the guide roller at the outlet when the moisture regain reaches the winding standard.

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