Fiber material wet forming mesh structure

Abstract

This invention relates to a fiber material web forming structure using a wet forming process, comprising: a forming web including an inclined section and a horizontal section connected sequentially, wherein the inclined section is set at a predetermined angle to the horizontal plane; a roller assembly connected to the forming web for driving its continuous operation; a dewatering mechanism including multiple vacuum dewatering units arranged sequentially along the running direction of the forming web, each vacuum dewatering unit being respectively located below the inclined section and the horizontal section; and a breast roller lifting mechanism connected to the forming web for replacing the forming web. The fiber material web forming structure designed in this invention, by employing a composite dewatering section structure combining inclined and horizontal sections, achieves highly efficient adaptability to various fiber slurries with different beating degrees, fiber lengths, and slurry concentrations, thereby effectively solving the problem of insufficient adaptability of existing wet forming equipment when facing production demands such as multi-variety, small-batch, and frequent production changes.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for wet web forming of fiber materials, and in particular to a web structure for wet web forming of fiber materials. Background Technology

[0002] In existing technologies, the web structure of wet forming of fiber materials is mainly divided into inclined web forming, long web forming, and circular web forming. Among them, the dewatering section of inclined web forming is an inclined forming web with a low web concentration, usually a few parts per ten thousand. The dewatering section is short, and the dewatering load per unit area is large. Therefore, it is more suitable for forming long fiber pulps with low or no beating. The dewatering section of long web forming is a horizontal forming web with a relatively high web concentration, usually a few parts per thousand. The dewatering section is long, and the dewatering load per unit area is relatively small. Therefore, it is more suitable for forming fiber pulps with medium to high beating degrees. Different web dewatering lengths need to be designed for pulps with different beating degrees and production speeds. The dewatering section of circular web forming is an arc, which is short in length and difficult to adjust.

[0003] Currently, with the rapid development of paper-based functional materials, the variety and series of products are increasing daily. Individual products are relatively small in scale, and production changeovers are very frequent. Furthermore, different products exhibit significant differences in parameters such as basis weight, freeness, and fiber length, leading to substantial variations in dewatering load requirements. However, existing wet-process forming wire mesh structures struggle to meet the demands of multi-product, highly adaptable production, especially when frequent production changes are required, as their production efficiency and flexibility fall short of expectations. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a fiber material wet-forming mesh structure that significantly improves the adaptability of the fiber material wet-forming mesh structure to different slurries through a dewatering structure combining inclined and horizontal sections.

[0005] To achieve the above objectives, the fiber material web structure designed in this invention includes:

[0006] The forming mesh includes an inclined section and a horizontal section connected in sequence, wherein the inclined section is set at a predetermined angle to the horizontal plane;

[0007] The roller assembly is connected to the forming mesh drive and is used to drive the forming mesh to run continuously;

[0008] The dehydration mechanism includes multiple vacuum dehydration units, which are arranged sequentially below the inclined section and the horizontal section along the running direction of the forming mesh.

[0009] A breast roller lifting mechanism, connected to the forming net, is used to replace the forming net;

[0010] The vacuum dewatering unit located below the inclined section is used to perform preliminary shaping and dewatering of the fiber slurry distributed on the inclined section, and the vacuum dewatering unit located below the horizontal section is used to perform secondary shaping and dewatering of the fiber slurry after preliminary shaping and dewatering in the inclined section; the start / stop status and dewatering intensity of each vacuum dewatering unit can be independently controlled; the forming waterline of the fiber material suspension is located on the inclined section or the horizontal section.

[0011] Preferably, the dehydration mechanism further includes a gravity dehydration unit, which is disposed below the inclined section and has a fixed dehydration intensity.

[0012] Preferably, the gravity dewatering unit includes forming plates and / or rollers arranged sequentially along the running direction of the forming mesh.

[0013] Preferably, the angle between the inclined segment and the horizontal plane is 1-30°.

[0014] Preferably, the length of the inclined section is 1-12m.

[0015] Preferably, the vacuum dehydration units are all vacuum forming boxes.

[0016] Preferably, the roller assembly includes a finishing roller disposed above the horizontal section, the axis of which is parallel to the horizontal section, for finishing the surface of the fiber material web.

[0017] Preferably, a secondary headbox for secondary forming of the fiber material web is disposed above the horizontal section, and the position of the secondary headbox is adjustable back and forth along the running direction of the forming mesh on the horizontal section.

[0018] Preferably, the breast roller lifting mechanism includes a first rotation fulcrum disposed below the front part of the inclined section, a rotating arm rotating around the first rotation fulcrum, and a breast roller disposed on the rotating arm; the forming mesh is wound around the breast roller and extends obliquely upward to form the inclined section.

[0019] Preferably, it further includes a second rotation fulcrum disposed on one side of the inclined section and a first white water tray disposed below the inclined section, one side of the first white water tray being connected to the rotating arm and the other side rotating around the second rotation fulcrum.

[0020] Preferably, the first white water tray includes a front guide arc plate, a drainage groove, and a rear guide arc plate. The drainage groove is located below the middle of the inclined section and extends along the width direction of the formed mesh. The front guide arc plate and the rear guide arc plate are respectively fixedly installed on both sides of the drainage groove.

[0021] Preferably, a support arm is provided in front of the rotating arm, and the rotating arm is fixedly installed on the support arm by fasteners.

[0022] Preferably, the roller group further includes a base roller, a tension roller, and a transition roller, and the forming mesh is wound around the base roller, the tension roller, the chest roller, and the transition roller in sequence; the vacuum dewatering unit below the inclined section is disposed between the chest roller and the transition roller, and is located above the first white water pan.

[0023] The fiber material web forming structure designed in this invention, through the use of a composite dewatering section combining inclined and horizontal sections, achieves highly efficient adaptability to various fiber slurries with different beating degrees, fiber lengths, and slurry concentrations. This effectively solves the problem of insufficient adaptability of existing wet forming equipment when facing production demands such as multi-variety, small-batch, and frequent production changes. Furthermore, this equipment also features a breast roller lifting mechanism and an adjustable white water pan, effectively shortening screen change time, reducing the difficulty of screen change operations, further improving production efficiency, and providing strong support for flexible production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the fiber material web formed by wet forming according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the chest roller lifting mechanism provided in the embodiments of this application.

[0026] The components include: forming mesh 10, inclined section 11, horizontal section 12, roller group 20, flat roller 21, tension roller 22, flat roller 23, transition roller 24, vacuum dewatering unit 30, breast roller lifting mechanism 40, first rotating fulcrum 41, rotating arm 42, breast roller 43, forming plate 44, cantilever 441, scraper 45, second rotating fulcrum 50, first white water tray 60, second white water tray 61, front guide arc plate 61, drainage groove 62, rear guide arc plate 63, support arm 70, and frame 80. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] like Figures 1 to 2As shown, the fiber material web forming structure described in this embodiment aims to meet the production needs of multiple products and high adaptability through the adjustment of the strength of the vacuum dewatering unit by coordinating inclined and horizontal web segments. This web structure mainly includes a forming web 10, a roller group 20, a dewatering mechanism, and a breast roller lifting mechanism 40 mounted on a frame 80. The breast roller lifting mechanism 40, connected to the forming web 10, is used for replacing the forming web 10; its specific structure will be described in detail in subsequent embodiments.

[0029] The forming wire 10 includes an inclined section 11 and a horizontal section 12 connected sequentially. The inclined section 11 is set at a predetermined angle to the horizontal plane. This angle can be adjusted according to actual production needs to optimize the dewatering effect and forming process. In this embodiment, the predetermined angle is typically between 1° and 30°, preferably 5°, 10°, or 20°. For example, for low-freezing pulp requiring rapid dewatering, a larger inclination angle can be used to enhance the gravity dewatering effect; while for pulp requiring finer forming, a smaller inclination angle can be selected to reduce the impact on the paper web. Furthermore, this combination of the inclined section 11 and the horizontal section 12 provides flexible process options for subsequent pulp dewatering, realizing the division of labor and cooperation between preliminary dewatering and fine forming. The length of the inclined section 11 also affects the dewatering effect. In this embodiment, the length of the inclined section 11 can be set to 1-12m, with different lengths selected according to actual needs. For example, for pulp requiring a longer pre-dewatering time, the length of the inclined section 11 can be appropriately increased to improve pre-dewatering efficiency. Specifically, the length of the inclined segment 11 can be set to 1m, 3m, or 5m.

[0030] Roller assembly 20, connected to the forming net 10, is used to drive the forming net 10 to run continuously. Roller assembly 20 specifically includes a base roller 21, a tension roller 22, and a transition roller 24. The forming net 10 is wound around the base roller 21, the tension roller 22, and the transition roller 24 in sequence to achieve tensioning, driving, and guiding of the forming net 10, ensuring that the forming net 10 maintains stable tension and movement trajectory during operation.

[0031] The dewatering mechanism includes multiple vacuum dewatering units 30, which are arranged sequentially below the inclined section 11 and the horizontal section 12 along the running direction of the forming mesh 10. Preferably, these vacuum dewatering units 30 are all vacuum forming boxes. The structural design of the vacuum forming box can effectively create a vacuum environment, thereby generating strong suction to quickly and efficiently remove moisture from the slurry. By rationally arranging and controlling these vacuum dewatering units, precise control of the slurry dewatering process can be achieved.

[0032] The vacuum dewatering unit 30, located below the inclined section 11, performs preliminary forming dewatering on the fiber pulp spread on the inclined section 11. This preliminary forming dewatering has a high dewatering intensity to quickly remove most of the water from the pulp, forming a preliminary wet paper web. The vacuum dewatering unit 30, located below the horizontal section 12, performs secondary forming dewatering on the fiber pulp after the preliminary forming dewatering on the inclined section 11. This secondary forming dewatering has a lower dewatering intensity to gently remove the remaining water from the pulp, thereby ensuring the forming quality of the fiber material web. For example, for paper webs requiring high-quality surface finish, the vacuum level of the vacuum dewatering unit below the horizontal section 12 can be adjusted to make its action gentler, thereby reducing disturbance to the paper web. In this embodiment, the forming water line of the fiber material suspension is located on the inclined section 11 or the horizontal section 12. The position of the forming water line can be flexibly configured according to actual needs to meet the requirements of different processes. For example, for paper webs requiring uniform forming, the forming water line can be set on the horizontal section 12.

[0033] Furthermore, the start / stop status and dewatering intensity of each vacuum dewatering unit 30 can be independently controlled. This means that different dewatering intensities can be achieved by controlling the vacuum level or pressure of different vacuum dewatering units 30. This independent control feature allows the forming mesh 10 to flexibly adapt to pulps with different freeness, fiber lengths, and pulp concentrations. For example, for low freeness or long fiber pulps, the dewatering intensity of the vacuum dewatering unit 30 below the inclined section 11 can be increased to quickly remove water, while the dewatering intensity of the vacuum dewatering unit 30 below the horizontal section 12 can be appropriately reduced to avoid over-dewatering and maintain fiber structure. For high freeness pulps, the dewatering intensity of the vacuum dewatering unit 30 below the inclined section 11 can be reduced to avoid fiber blockage caused by rapid dewatering, while the dewatering intensity of the vacuum dewatering unit 30 below the horizontal section 12 can be increased to achieve gentle dewatering and ensure forming quality. Through this flexible adjustment of dewatering intensity, the dewatering process can be optimized, achieving good adaptability to various pulps.

[0034] In another embodiment, such as Figure 2 As shown, the dewatering mechanism also includes a gravity dewatering unit, which is located below the inclined section 11 and has a fixed dewatering intensity. This arrangement fully utilizes the inclination angle provided by the inclined section 11, making it easier for the slurry to be dewatered under gravity. It is worth noting that the dewatering intensity of the gravity dewatering unit is fixed; that is, its dewatering capacity mainly depends on gravity and structural design, and is not adjustable. This simplifies operation, ensures reliability, and makes it an ideal choice for initial dewatering. In specific implementation, the gravity dewatering unit includes a forming plate 44 and / or a roller 23 arranged sequentially along the running direction of the forming screen 10.

[0035] In some embodiments, the roll group 20 includes a finishing roll (not shown) disposed above the horizontal section 12, the axis of which is parallel to the horizontal section 12, for finishing the surface of the fiber material web. The horizontal section 12 is typically located in the later stage of the forming process, at which point the fiber material web has been basically formed, has a low moisture content, is more suitable for surface finishing, and is less likely to damage the formed paper structure.

[0036] In some embodiments, a secondary headbox (not shown) for secondary forming of the fiber material web is disposed above the horizontal section 12. The position of the secondary headbox is adjustable back and forth on the horizontal section 12 along the running direction of the forming wire 10. The secondary headbox can add a new pulp layer to the surface of the already formed fiber material web on the horizontal section 12, realizing the forming of a layered paper web structure. This enables the production of more diversified products to meet different market demands.

[0037] In some embodiments, such as Figure 2 As shown, the breast roller lifting mechanism 40 includes a first rotation fulcrum 41 located below the front part of the inclined section 11, a rotating arm 42 rotating around the first rotation fulcrum 41, and a breast roller 43 located on the rotating arm 42; the forming net 10 is wrapped around the breast roller 43 and extends obliquely upward to form the inclined section 11.

[0038] With this structural design, during normal operation, a support arm 70 is provided in front of the rotating arm 42. The rotating arm 42 is fixedly installed on the support arm 70 by fasteners, while the breast roller 43 holds the forming net 10 in the working position for the production of fiber material webs. When it is necessary to replace the forming net 10, the operator first releases the support arm from the rotating arm 42, and then pushes or uses other tools to drive the rotating arm 42 to rotate downwards around the first rotation fulcrum 41. At this time, the breast roller 43 also rotates, thereby shortening the running path of the forming net 10 and relaxing the net tension. At this time, the operator can easily remove the old forming net 10 and replace it with a new forming net 10. After the net replacement is completed, the operator rotates the rotating arm 42 back to its original position and fixes it with the support arm, thereby re-tensioning the forming net 10, and the equipment can resume normal production. The operation is simple and quick, greatly shortening the time required for net replacement, improving production efficiency, and making the net replacement operation safer and more reliable.

[0039] In this embodiment, as Figure 2 As shown, a scraper 45 is also installed on the rotating arm 42. The scraper 45 is located next to the breast roller 43. Its main function is to scrape off the fibers, impurities or other residues that adhere to the breast roller 43, so as to prevent them from accumulating on the breast roller 43 and affecting subsequent production.

[0040] In some embodiments, such as Figure 2As shown, it also includes a second rotation fulcrum 50 disposed on one side of the inclined section 11 and a first white water tray 60 disposed below the inclined section 11. One side of the first white water tray 60 is connected to the rotating arm 42, and the other side rotates around the second rotation fulcrum 50. Through the cooperation of the second rotation fulcrum 50 and the first white water tray 60, the first white water tray 60 can rotate in coordination with the rotating arm 42, thereby avoiding interference between the breast roller 43, forming plate 44 and other components and the first white water tray 60 during screen changing operations, and providing the necessary space for smooth screen changing operations. In this embodiment, a second white water tray 61 is disposed below the straight section 12.

[0041] In some embodiments, such as Figure 2 As shown, the first white water tray 60 includes a front guide arc plate 61, a drainage trough 62, and a rear guide arc plate 63. The drainage trough 62 is located below the middle of the inclined section 11 and extends along the width direction of the forming mesh 10. The guide arc plate and the rear guide arc plate 63 are respectively fixedly installed on both sides of the drainage trough 62. In actual operation, the arc-shaped structure of the front guide arc plate 61 and the rear guide arc plate 63 can ensure that the wastewater generated during the dewatering process flows smoothly into and out of the drainage trough 62, thereby avoiding splashing or backflow of water. In the drainage trough 62, the water will gather and flow along the length direction of the drainage trough 62, and finally be smoothly discharged through the rear guide arc plate 63, which facilitates wastewater collection and unified treatment.

[0042] In one specific implementation, such as Figure 2 A cantilever 441 is fixedly installed on the frame 80, and the rear guide arc plate 63 is hinged to the cantilever 441. That is, by fixing the cantilever 441 on the frame 80, a reliable support structure is provided for the rear guide arc plate 63.

[0043] In some embodiments, such as Figure 1 , Figure 2 As shown, the height of the support arm 70 is adjustable. Different fiber pulps may require different tilt angles of the tilt section 11. By adjusting the height of the support arm 70, the position of the breast roller 43 can be finely adjusted, thereby changing the angle and length of the tilt section 11 to meet the production requirements of different products, and also to meet the fixation requirements after the tilt angle of the tilt section 11 is adjusted.

[0044] In some embodiments, such as Figure 1 As shown, the forming net 10 is wound sequentially around the base roller 21, tension roller 22, breast roller 43, and transition roller 24; the vacuum dewatering unit 30 below the inclined section 11 is located between the breast roller 43 and the transition roller 24, and above the first white water tray 60. The reasonable arrangement of the roller group can reduce the bending and wear of the forming net 10 and extend its service life. The first white water tray 60 is located below the vacuum dewatering unit 30, which can conveniently collect the white water removed from the inclined section 11 and guide it to the drain outlet, facilitating the recycling and treatment of the white water.

[0045] The fiber material web forming structure provided in this embodiment, through the use of a composite dewatering section structure combining inclined and horizontal sections, achieves highly efficient adaptability to various fiber slurries with different beating degrees, fiber lengths, and slurry concentrations. This effectively solves the problem of insufficient adaptability of existing wet forming equipment when facing production demands such as multi-variety, small-batch, and frequent production changes. Furthermore, this equipment also features a breast roller lifting mechanism and an adjustable white water pan, effectively shortening screen change time, reducing the difficulty of screen change operations, further improving production efficiency, and providing strong support for flexible production.

[0046] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," 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 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. Therefore, they should not be construed as limitations on this invention.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 according to the specific circumstances.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A web structure formed by wet forming of fiber material, characterized in that, include: The forming mesh includes an inclined section and a horizontal section connected in sequence, wherein the inclined section is set at a predetermined angle to the horizontal plane; The roller assembly is connected to the forming mesh drive and is used to drive the forming mesh to run continuously; The dehydration mechanism includes multiple vacuum dehydration units, which are arranged sequentially below the inclined section and the horizontal section along the running direction of the forming mesh. A breast roller lifting mechanism, connected to the forming net, is used to replace the forming net; The vacuum dewatering unit located below the inclined section is used to perform preliminary shaping and dewatering of the fiber slurry distributed on the inclined section, and the vacuum dewatering unit located below the horizontal section is used to perform secondary shaping and dewatering of the fiber slurry after preliminary shaping and dewatering in the inclined section; the start / stop status and dewatering intensity of each vacuum dewatering unit can be independently controlled; the forming waterline of the fiber material suspension is located on the inclined section or the horizontal section; The breast roller lifting mechanism includes a first rotation fulcrum located below the front part of the inclined section, a rotating arm rotating around the first rotation fulcrum, and a breast roller mounted on the rotating arm; the forming mesh is wound around the breast roller and extends obliquely upward to form the inclined section; It also includes a second rotation fulcrum disposed on one side of the inclined section and a first white water pan disposed below the inclined section, one side of the first white water pan being connected to the rotating arm and the other side rotating around the second rotation fulcrum.

2. The fiber material web structure formed by wet forming according to claim 1, characterized in that, The dehydration mechanism also includes a gravity dehydration unit, which is located below the inclined section and has a fixed dehydration intensity.

3. The fiber material web structure formed by wet forming according to claim 2, characterized in that, The gravity dewatering unit includes forming plates and / or rollers arranged sequentially along the running direction of the forming mesh.

4. The fiber material web structure formed by wet forming according to claim 1, characterized in that, The angle between the inclined segment and the horizontal plane is 1-30°.

5. The fiber material web structure formed by wet forming according to claim 1, characterized in that, The length of the inclined section is 1-12m.

6. The fiber material web structure formed by wet forming according to claim 1, characterized in that, All vacuum dehydration units are vacuum forming boxes.

7. The fiber material web structure formed by wet forming according to claim 1, characterized in that, The roller assembly includes a finishing roller disposed above the horizontal section, the axis of which is parallel to the horizontal section, for finishing the surface of the fiber material.

8. The fiber material web structure formed by wet forming according to claim 1, characterized in that, A secondary headbox for secondary forming of the fiber material web is disposed above the horizontal section. The position of the secondary headbox is adjustable back and forth along the running direction of the forming mesh on the horizontal section.

9. The fiber material web structure formed by wet forming according to claim 1, characterized in that, The first white water tray includes a front guide arc plate, a drainage groove and a rear guide arc plate. The drainage groove is located below the middle of the inclined section and extends along the width direction of the forming mesh. The front guide arc plate and the rear guide arc plate are respectively fixedly installed on both sides of the drainage groove.

10. The fiber material web structure formed by wet forming according to claim 1, characterized in that, A support arm is also provided in front of the rotating arm, and the rotating arm is fixedly installed to the support arm by fasteners.

11. The fiber material web structure formed by wet forming according to claim 1, characterized in that, The roller assembly also includes a base roller, a tension roller, and a transition roller, with the forming mesh wound around the base roller, tension roller, chest roller, and transition roller in sequence; the vacuum dewatering unit below the inclined section is disposed between the chest roller and the transition roller, and is located above the first white water pan.

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