Nonwoven oblique mesh forming device with defoaming structure

Abstract

This invention provides a nonwoven fabric inclined web forming device with a defoaming structure, belonging to the technical field of nonwoven fabric production equipment. It includes a forming machine body, inside which are arranged a web roller assembly and a slurry tank. A slurry inlet box is connected to the rear side of the slurry tank, and a cover plate covers the upper part of the slurry tank. Defoaming spray devices are provided on the front side of the cover plate (i.e., where the fiber web formed on the web roller assembly exposes the slurry) and on the outer side of the rear cover plate. This invention can effectively break up and disperse foam at the inlet and outlet of the forming device, preventing fiber agglomeration and thus improving the fabric surface forming quality of the nonwoven fabric.

Description

Technical Field

[0001] This utility model belongs to the technical field of nonwoven fabric production equipment, specifically relating to a nonwoven fabric inclined mesh forming device with a defoaming structure. Background Technology

[0002] Due to its unique fiber arrangement and structure, wet-laid nonwoven fabric is widely used in indoor air purifiers, household air conditioners, automotive air conditioners, vacuum cleaners, and air purification in large cleanrooms. Its typical production process includes: slurry mixing tank → slurry forming tank → slurry pump → forming → fabric surface sizing → oven drying → winding machine, etc.

[0003] In the critical forming process, the fiber pulp mixture is fed into an inclined web forming machine for dehydration, forming a wet fiber web. However, during the operation of the forming machine, a large amount of scum, foam, and bubbles easily form inside and on the surface of the pulp. These foams are adhesive, entraining and agglomerating the flocculent fibers in the pulp. Over time, these fiber-foam mixtures tend to adhere to the inner walls of the inlet and outlet covers of the forming machine. When they accumulate to a certain extent, these fiber clumps detach from the covers and fall onto the fiber web being formed. This phenomenon results in streaks of fiber clumps on the final nonwoven fabric surface, severely damaging the uniformity of the fabric and the forming quality, thus reducing the product yield.

[0004] Currently, conventional mechanical or chemical defoaming methods have limitations in the specific environment of inclined wire mesh forming machines, either yielding unsatisfactory results, potentially introducing new pollution, or being excessively costly. Therefore, there is an urgent need for a device that can effectively solve the problem of foam accumulation inside inclined wire mesh forming machines, while also possessing a simple structure and not disrupting normal production. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a nonwoven fabric inclined mesh forming device with a defoaming structure, which can effectively break and disperse the foam at the inlet and outlet of the forming device, prevent the fibers from agglomerating, and thus improve the forming quality of the nonwoven fabric.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A nonwoven oblique mesh forming device with a defoaming structure includes a forming machine body, inside which a mesh roller assembly and a slurry tank are provided. A slurry inlet box is connected to the rear side of the slurry tank, and a cover plate covers the upper part of the slurry tank. Spray defoaming devices are provided on the front side of the cover plate, i.e., at the position where the fiber mesh formed on the mesh roller assembly is exposed to the slurry, and on the outer side of the rear cover plate.

[0007] Further defining the above solution, the spray defoaming device includes a spray water pipe, which is fixedly installed on the outside of the front cover plate and the outside of the rear cover plate; multiple nozzles are evenly distributed along the axial direction of the spray water pipe, and the spraying direction of the nozzles is towards the space between the edge of the cover plate and the slurry surface in the slurry pool.

[0008] As a further limitation of the above scheme, the spray pipe is connected to a water source through a water supply pipe, and the water supply pipe is equipped with a water valve for controlling the water flow.

[0009] Further defining the above scheme, the spray pipe, water supply pipe, and water valve together constitute an independent spray defoaming device, which is independent of the slurry conveying system of the molding machine body.

[0010] Further specifying the above scheme, the nozzle is a fan-shaped nozzle or a cone-shaped nozzle.

[0011] Further defining the above scheme, the spray defoaming device located outside the front cover plate and the spray defoaming device located outside the rear cover plate are controlled by the same water valve, or by two separately installed water valves.

[0012] As a further limitation of the above scheme, the spray water of the spray defoaming device is clean water or plain water.

[0013] Further specifying the above solution, the number of spray defoaming devices is two sets, which are independently installed outside the front cover plate and outside the rear cover plate, respectively.

[0014] Advantages of this utility model compared to the prior art: 1. This solution effectively defoams and prevents flocculation: By setting up spray defoaming devices at key positions at the front and rear of the molding machine body (the slurry outlet of the mesh roller assembly outside the front cover plate and the outer side of the rear cover plate), the spray water can be precisely sprayed into the space between the cover plate edge and the liquid surface where foam is prone to accumulate, directly breaking up the scum and foam, fundamentally preventing foam from flocculating into clumps with fibers, and effectively avoiding the impact of fiber clumps falling off on the fabric quality; 2. This solution has a simple structure and low cost: This utility model uses spray water as the defoaming medium. Structurally, it only requires the addition of water pipes, nozzles and control valves. It does not require complex mechanical mechanisms or expensive chemical additives, resulting in low manufacturing costs and easy installation and maintenance. 3. This solution is highly adaptable and does not affect production: The defoaming structure is independent of the main operating components of the molding host. The addition of spray water will not interfere with the normal dewatering and molding process of the fiber slurry. Moreover, the water volume can be precisely controlled by the water valve, making it suitable for different production conditions and slurry characteristics. 4. This solution improves product quality: By eliminating fiber clump defects caused by foam, it significantly improves the uniformity, flatness, and overall forming effect of the nonwoven fabric surface, thereby enhancing the product grade and pass rate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 A schematic diagram of the structure in direction A; Figure 3 This is a schematic diagram of the spray pipe and nozzle configuration in this utility model.

[0016] In the diagram: 1. Molding machine body; 2. Mesh roller assembly; 3. Cover plate; 4. Front cover plate; 5. Rear cover plate; 6. Slurry tank; 7. Slurry inlet box; 8. Spray defoaming device; 9. Spray water pipe; 10. Nozzle; 11. Water supply pipe; 12. Water valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] Please see Figure 1-3 The embodiments of this utility model are described in detail below.

[0021] See Figure 1 As shown, the nonwoven inclined web forming device with a defoaming structure provided by this utility model has a forming machine body 1 as its main body. A web roller assembly 2 is installed inside the forming machine body 1 to support the forming web and assist in dewatering. A slurry pool 6 is formed at the lower part of the forming machine body 1 for storing fiber slurry. The rear side (usually the higher side) of the slurry pool 6 is connected to a slurry inlet box 7 via a pipe, through which the fiber slurry enters. The top of the slurry pool 6 is closed by a cover plate 3, which can be divided into a front cover plate 4 and a rear cover plate 5 depending on its position.

[0022] The core improvement of this utility model lies in the defoaming structure. A set of spray defoaming devices 8 are fixedly installed on the outside of the front cover plate 4 of the cover plate 3, that is, at the position where the fiber web formed on the mesh roller assembly 2 exposes the slurry (that is, near the outlet side of the wet fiber web leaving the forming device), and on the outside of the rear cover plate 5 (that is, the area where the slurry flows in and foam is easily generated).

[0023] Each spray defoaming device 8 mainly includes a spray water pipe 9. Multiple nozzles 10 are evenly distributed along the length of the spray water pipe 9 (usually parallel to the edge of the cover plate). The spray direction of the nozzles 10 is towards the space between the edge of the cover plate 3 and the slurry surface in the slurry pool 6, ensuring that the water column or water curtain sprayed can cover and impact the potential foam accumulation space between the edge of the cover plate and the slurry surface in the slurry pool 6.

[0024] The spray pipe 9 is connected to the factory's clean water source (such as clean water or white water) via the water supply pipe 11. A water valve 12 is installed on the water supply pipe 11 for turning the spray system on and off and adjusting the spray water volume.

[0025] Preferably, the nozzle 10 is a fan-shaped nozzle or a cone-shaped nozzle.

[0026] Working principle: When the inclined wire forming machine is working normally, the fiber slurry enters the slurry tank 6 from the slurry inlet box 7 and is dehydrated on the wire roller assembly 2 to form a wet fiber web. The foam generated during this process will rise and accumulate on the inner surface of the cover plate 3, especially at the junction of the edges of the front cover plate 4 and the rear cover plate 5 with the liquid surface.

[0027] At this time, water valve 12 is opened, and cleaning water enters the front and rear spray pipes 9 through water supply pipe 11, and is continuously sprayed out through evenly distributed nozzles 10. The sprayed water directly acts on the foam accumulation area: (1) The water flow exerts physical impact and shearing force on the foam, breaking large foams into small bubbles or causing them to burst directly.

[0028] (2) The presence of water flow changes the local surface tension of the liquid surface and forms surface flow, which helps to disperse the foam that has been formed and carry the scum, preventing it from stagnating and aggregating fibers.

[0029] (3) By spraying continuously or intermittently, a stable foam layer cannot be formed in the edge area of ​​the cover plate, thus cutting off the way for the fibers to flocculate.

[0030] Ultimately, when the wet fiber web leaves the forming machine, there are no more detached fiber clumps on the surface, ensuring that the nonwoven fabric product obtained after subsequent drying and winding has excellent and uniform fabric quality.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nonwoven oblique mesh forming device with a defoaming structure, comprising a forming machine body (1), wherein a mesh roller assembly (2) and a slurry tank (6) are provided inside the forming machine body (1), a slurry inlet box (7) is connected to the rear side of the slurry tank (6), and a cover plate (3) covers the upper part of the slurry tank (6); characterized in that: Spray defoaming devices (8) are provided on the outside of the front cover plate (4) of the cover plate (3), at the position where the fiber web formed on the web roller assembly (2) is exposed to the slurry, and on the outside of the rear cover plate (5).

2. The nonwoven oblique mesh forming device with defoaming structure according to claim 1, characterized in that: The spray defoaming device (8) includes a spray water pipe (9), which is fixedly installed on the outside of the front cover plate (4) and the outside of the rear cover plate (5); a plurality of nozzles (10) are evenly distributed along the axial direction of the spray water pipe (9), and the spraying direction of the nozzles (10) is towards the space between the edge of the cover plate (3) and the slurry surface in the slurry pool (6).

3. The nonwoven oblique mesh forming device with defoaming structure according to claim 2, characterized in that: The spray pipe (9) is connected to the water source through the water supply pipe (11), and the water supply pipe (11) is equipped with a water valve (12) for controlling the water flow.

4. The nonwoven oblique mesh forming device with defoaming structure according to claim 3, characterized in that: The spray pipe (9), water supply pipe (11) and water valve (12) together constitute an independent spray defoaming device (8), which is independent of the slurry conveying system of the molding machine body (1).

5. The nonwoven oblique mesh forming device with defoaming structure according to claim 2, characterized in that: The nozzle (10) is a fan-shaped nozzle or a cone-shaped nozzle.

6. The nonwoven oblique mesh forming device with defoaming structure according to claim 1, characterized in that: The spray defoaming device (8) located outside the front cover plate (4) and the spray defoaming device (8) located outside the rear cover plate (5) are controlled by the same water valve (12) or by two separate water valves (12).

7. The nonwoven oblique mesh forming device with defoaming structure according to claim 1, characterized in that: The spray water from the defoaming device (8) is clean water or plain water.

8. The nonwoven oblique mesh forming device with defoaming structure according to claim 1, characterized in that: The number of spray defoaming devices (8) is two sets, which are independently set outside the front cover plate (4) and outside the rear cover plate (5).

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