Folding composite large plate, processing method and suspended ceiling containing same

Abstract

The application discloses a kind of edge folding composite large plate, processing method and the ceiling containing it.The edge folding composite large plate includes panel, backboard and core layer, the panel includes: with backboard opposite arrangement panel main part, and set in panel main part outer edge, with panel main part connection integral panel outer ring part;Panel outer ring part is bent towards backboard direction, forms bending plate;Bending plate and backboard corner cooperation place is not higher than backboard;Panel main part corner is smooth without gap.The method provided by the application, by the intersection design of bending line part, in combination with only one small angle of step bending forming process each time, there is a certain interference amount in the bending line of adjacent two sides when bending forming, a micro deep drawing effect is formed in the corner by using the good ductility of aluminum material when bending, so that the panel corner after bending has no gap, the flatness and the appearance of the large plate are improved, the obtained large plate does not need to be spliced when installing frame, it is easy to operate, and it is suitable for quick installation.

Description

Technical Field

[0001] This invention relates to the field of decorative ceiling technology, and in particular to a folded-edge composite panel that does not require a frame during installation and its processing method. Background Technology

[0002] Decorative ceilings are an essential component of modern interior design, especially in kitchens and bathrooms, where there are numerous ceiling appliances and a multitude of pipe and wiring installation scenarios.

[0003] Currently, the most commonly used decorative ceiling types include: gypsum board ceilings, mineral wool board ceilings, strip ceilings (wood, PVC, aluminum), and aluminum ceiling panels. Among these, aluminum ceiling panels are particularly widely used. Traditional single-layer aluminum ceiling panel products, such as... Figure 1 As shown, its dimensions are mostly based on a 300 module, and the maximum size can generally be 600*1200. However, the larger the size, the thicker the board material is required, and the more difficult it is to ensure its flatness.

[0004] As consumers have increasingly higher demands for ceilings, users generally desire a stronger sense of unity and avoid excessive segmentation. As a result, aluminum-based composite panels have emerged in the ceiling industry. Represented by aluminum honeycomb composite panels, these panels offer advantages such as high specific strength, good flatness, and excellent thermal and sound insulation, leading to their rapid acceptance by a wide range of users for their installation and performance.

[0005] like Figure 2 As shown, an aluminum honeycomb composite panel generally consists of a face panel 101, a back panel 102, and a honeycomb core 103. The honeycomb core 103 is disposed between the face panel 101 and the back panel 102, and one side of the honeycomb core 103 is connected to the face panel 101 through a first adhesive layer 104, while the other side of the honeycomb core 103 is connected to the back panel 102 through a second adhesive layer 105. The face panel 101, the back panel 102, and the honeycomb core 103 are all made of aluminum.

[0006] Aluminum-based composite panels have solved the aesthetic and overall design issues for users, but an effective solution for their installation has remained elusive. In their evolution and development, the following two solutions have been widely adopted in practical applications:

[0007] (1) Aluminum-based composite large panel frame scheme

[0008] The aluminum-based composite panel framing solution, as the name suggests, involves using aluminum profiles to frame the four sides of an aluminum-based composite panel. Combined with... Figure 3 and Figure 4The specific operation process of this method is as follows: According to the size of the aluminum-based composite panel 201, the two ends of the four aluminum profiles 202 with specific cross sections are cut at 45°. Then, they are enclosed on the four corresponding sides of the aluminum-based composite panel 201. The four corners are fastened with corner brackets and screws. The aluminum profiles 202 and the aluminum-based composite panel 201 are then locked together with screws 203 at a certain interval along the four sides to obtain the effect of "enlarged version of single-layer aluminum ceiling panel" (length and width dimensions). Then, the ceiling is installed in the same way as the single-layer aluminum ceiling panel.

[0009] The advantage of this solution is that it largely retains the existing installation habits for single-layer aluminum ceiling panels and is generally compatible with the installation accessories for single-layer aluminum ceiling panels. However, its disadvantages are also obvious:

[0010] A. The four sides need to be framed. Cutting the frame requires pre-machining holes and making 45° chamfers on site, which requires high processing precision.

[0011] B. The frame and corner brackets require a large number of screws (calculated based on a screw spacing of 300, a 1200*2400 board requires approximately 40 screws), resulting in low installation efficiency.

[0012] C. Even after installation, there are still cases where the frame material is exposed, affecting the overall aesthetics of the ceiling.

[0013] (2) Pre-folded aluminum-based composite large plate solution

[0014] To overcome the low installation efficiency of aluminum-based composite panel frame solutions, a pre-folded aluminum-based composite panel solution, mimicking the process of single-layer aluminum ceiling panels, was later developed. The specific operation process of this method is as follows: first, the panel is shaped using the process of single-layer aluminum ceiling panels (pre-folded edges on all four sides); then, adhesive is applied to the back of the panel, and adhesive is also applied to the back panel cut to the specified dimensions; finally, the adhesive surfaces of the panel and back panel are respectively bonded to both sides of the honeycomb core cut to the specified dimensions.

[0015] The advantage of this solution is that it eliminates the framing step, allowing the processed aluminum-based composite panels to be used directly as "enlarged versions of single-layer aluminum ceiling panels." However, its production requires the panels to be individually formed and then glued, the back panels to be cut and glued as needed, and the honeycomb cores to be stretched and trimmed individually. Overall, the process is relatively complex, with low forming efficiency, making continuous production impossible. Therefore, fundamentally, the pre-folded aluminum-based composite panel solution only moves the inefficiency from the installation stage to the production stage, still limiting its widespread adoption. Summary of the Invention

[0016] This application provides a folded composite panel and its processing method, which solves the technical problem of low production or installation efficiency of composite panels in the prior art. It adopts a post-folding micro-drawing process, which can support continuous production, and has high production and installation efficiency. After installation and splicing, there is no exposed material or holes, and the ceiling is flat and beautiful.

[0017] This application provides a folded composite panel, including a front panel, a back panel, and a core layer disposed between the front panel and the back panel. The front panel comprises...

[0018] The main body of the panel is disposed opposite to the back plate, and

[0019] An outer ring portion of the panel is located at the outer edge of the main body of the panel and is integrally connected to the main body of the panel;

[0020] The outer edge of the panel is bent toward the back plate to form a bent plate; the corner of the bent plate that mates with the back plate is not higher than the back plate.

[0021] The corners of the main body of the panel are flat and without gaps.

[0022] Preferably, the corners of the back plate, the corners of the core layer, and each corner of the bending plate are rounded; the corners of the bending plate fit against the corners of the core layer and do not protrude beyond the rounded corners of the core layer.

[0023] Preferably, at least one set of opposite bent plate main bodies of the folded composite panel are higher than the back plate;

[0024] At least one set of opposite bent plates has an anti-detachment structure for positioning and locking on the portion above the back plate;

[0025] Preferably, the bending plate forms a set angle with the main body of the panel, usually 90°, but can also be 45°, 60°, etc., and can be designed according to specific needs.

[0026] Preferably, the distance between the bent plate and the core layer cross-section is less than 1.5 mm.

[0027] This application also provides a method for processing a folded composite large plate, the steps of which are as follows:

[0028] Step S1: Prepare the composite board;

[0029] The composite panel includes a front panel, a back panel, and a core layer. The core layer is disposed between the front panel and the back panel, and one side of the core layer is connected to the front panel through a first adhesive layer, while the other side of the core layer is connected to the back panel through a second adhesive layer.

[0030] Step S2: Pre-process the edges of the composite board;

[0031] The back plate, first adhesive layer and core layer of the outer edge of the composite large board are removed, and the panel is retained for folding; the panel retained on the outer edge of the composite large board for folding is defined as a bending plate.

[0032] Remove the material from the corners of the bent plate that would interfere with the bending process;

[0033] Make the bending lines of the adjacent side bending plates intersect to achieve a slight stretching effect during bending, so that the corner of the panel body at the junction of the adjacent side bending plates is complete and without gaps after bending.

[0034] Step S3: Form an anti-detachment structure for positioning and locking on the bending plate;

[0035] Step S4: Bend the bending plate toward the back plate of the composite large plate. The bending process is broken down into several steps, and the bending angle gradually increases from small to large to form the shape.

[0036] Step S5: After the panels on each edge of the composite panel are bent and shaped, the folded composite panel is obtained. Due to the micro-drawing effect of the gradual forming process, the corners of the main panel of the folded composite panel are flat and without gaps.

[0037] Preferably, in step S1, the composite large plate is produced by a continuous forming process.

[0038] Preferably, in step S2, during the pre-processing,

[0039] The width of the corner of the bent plate is not greater than the sum of the thicknesses of the core layer and the back plate, so that after the bent plate is bent, the corner is not higher than the back plate.

[0040] The width of the main body of the bent plate on at least one pair of opposite sides of the composite panel is greater than the sum of the thicknesses of the core layer and the back plate, so that after the bent plate is bent, the main body of the bent plate on at least one pair of opposite sides is higher than the back plate.

[0041] Round the corners of the back plate and the core layer, and also round the corners of the bending plate where the interfering material is removed.

[0042] The distance between the bending line and the core layer cross-section is less than 1.5 mm.

[0043] Preferably, in step S3, the anti-detachment structure is provided on the portion of the bent plate that protrudes above the back plate after bending.

[0044] This application embodiment also provides a suspended ceiling, including a triangular keel and the above-mentioned folded composite panel, wherein the bent plates of two adjacent folded composite panels are attached and inserted into the triangular keel, and the anti-detachment structure on the bent plate is locked in the triangular keel.

[0045] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0046] 1. The folded composite panel processing method provided in this application, through a brand-new process design, can support continuous production and improve production efficiency.

[0047] 2. The folded composite panel processing method provided in this application, through the cross design of the bending lines and the step-by-step bending forming process of bending only a small angle each time, makes the bending lines of two adjacent perpendicular sides have a certain amount of interference during bending forming. In this way, the good ductility of aluminum material is used to form a micro-drawing effect at the corners during bending, so that there are no gaps at the corners of the panel after bending, which improves the flatness and aesthetics of the panel.

[0048] 3. The folded composite panel provided in this application is easy to install, requires no frame splicing, is suitable for rapid installation, and improves installation efficiency.

[0049] 4. The folded composite large panel provided in this application can be used for decorative ceilings, as well as for walls and other fields, with a wide range of applications. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the structure of a single-layer aluminum ceiling panel product.

[0051] Figure 2 This is a schematic diagram of the aluminum honeycomb composite panel product structure;

[0052] Figure 3 This is a schematic diagram of the structure of a large aluminum-based composite panel behind a single frame.

[0053] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0054] Figure 5 This is a flowchart of the folding composite large plate processing method provided in the embodiments of this application;

[0055] Figure 6 This is a layout diagram of the continuous forming equipment for aluminum-based composite large plates in the embodiments of this application;

[0056] Figure 7 This is a flowchart of the continuous forming process of aluminum-based composite large plates in the embodiments of this application;

[0057] Figure 8This is a schematic diagram showing the state of the aluminum-based composite large plate after pre-processing in the embodiments of this application;

[0058] Figure 9 This is a magnified axial view of a portion of the pre-treated corner of the aluminum-based composite large plate in an embodiment of this application.

[0059] Figure 10 This is a partially enlarged top view of the pre-treated corner of the aluminum-based composite large plate in the embodiment of this application;

[0060] Figure 11 This is a schematic diagram of the overall structure of the folded composite large plate after molding in the embodiments of this application;

[0061] Figure 12 This is a partial structural diagram of the folded composite large plate after forming in an embodiment of this application;

[0062] Figure 13 This is a partial enlarged view of the folded composite panel after forming in the embodiments of this application;

[0063] Figure 14 This is an enlarged view of the corner after bending using a conventional bending process;

[0064] Figure 15 A comparative schematic diagram showing the corner notches of folded composite large plates prepared by conventional methods and the method of this application; (a) conventional method, (b) method of this application;

[0065] Figure 16 A schematic diagram illustrating the application of the folded composite panel prepared according to an embodiment of this application in a suspended ceiling;

[0066] Figure 17 This is a schematic diagram showing the protrusion of the folded composite panel being secured within the triangular keel. Detailed Implementation

[0067] This application provides a folded composite panel and its processing method, which solves the technical problem of low production or installation efficiency of composite panels in the prior art.

[0068] The technical solution in this application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0069] The process employs a post-folding edge process. The so-called post-folding edge process is in contrast to the pre-folding edge aluminum-based composite panel solution mentioned above. The pre-folding edge solution involves folding the panel edge first, and then bonding it with the honeycomb core and back panel. The post-folding edge process, on the other hand, is a process of post-processing and folding the aluminum-based composite panel after it has been bonded together.

[0070] In this way, the same installation habits as single-layer aluminum panels can be used in the installation process; while in the production process, pre-formed aluminum composite panels can be directly used for processing, which can support continuous production and improve the efficiency of production and installation.

[0071] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0072] Figure 5 This is a flowchart of the folded composite panel processing method provided in the embodiments of this application. The composite panel processing method includes the following steps:

[0073] Step S1: Prepare a large aluminum-based composite panel, usually rectangular;

[0074] Aluminum-based composite panels are produced using a continuous forming process. Figure 6 This is a layout diagram of a continuous forming equipment for aluminum-based composite large panels. Figure 7 This is a flow chart of the continuous forming process for aluminum-based composite large panels. The face panel, back panel, honeycomb core, first adhesive layer, and second adhesive layer are each wound onto corresponding reels. The face panel and back panel are made of aluminum, and the first and second adhesive layers are made of polymer hot melt adhesive film (cast film). Face aluminum roll 301, back aluminum roll 302, honeycomb core roll 303, first cast film roll 304, and second cast film roll 305 rotate and unload at set speeds, pre-combining the face aluminum with the first cast film, pre-combining the back aluminum with the second cast film, and stretching the honeycomb core. Then, the face aluminum, honeycomb core, and back aluminum are thermally bonded, the cast film melts, and the face aluminum, honeycomb core, and back aluminum are connected as a single unit. After shaping and cooling, a protective film is applied to the surface of the face aluminum. Finally, the material is collected after longitudinal cutting, traction, and transverse cutting. Figure 6 In the diagram, A to H represent: pre-composite section, composite section, cooling section, coating section, longitudinal cutting section, traction section, transverse cutting section, and receiving section, respectively.

[0075] Step S2: Pre-process the aluminum-based composite large plate. The specific operations are as follows:

[0076] By mechanical processing, the back plate, first adhesive layer, and honeycomb core of the outer edge of the aluminum-based composite panel are removed, while the front panel is retained for edge folding. The retained front panel is hereinafter defined as bending plate 501. Figure 8 As shown. The cast film bonded to the bending plate 501 can also be retained. Here, the protective film attached to the panel surface should be retained to protect the panel surface.

[0077] Combination Figure 8 During the same clamping process as the above processing, the cutting tool is adjusted to remove a portion of the material that might interfere with the bending and installation of the four corners of the bending plate 501. Figure 8 As shown at point P in the middle.

[0078] In a preferred embodiment, the back plate and honeycomb core are rounded at the four corners of the aluminum-based composite plate; similarly, rounded corners are machined at the locations where interference material is removed from the bent plate 501. Figure 9 As shown at point α. These rounded corners, without affecting the strength and decorative effect of the aluminum-based composite panel, can prevent scratches and effectively reduce the risk of injury to workers during installation.

[0079] In a preferred embodiment, during pre-processing, the bending lines of the adjacent side bending plates 501 are made to intersect, such as... Figure 10 As shown at point M, this design achieves a slight stretching effect during bending, ensuring that the corner of the panel body at the junction of adjacent sides remains intact without any gaps after bending.

[0080] The bending line is a line on the panel used to mark the bending position. In theoretical mechanical calculations, the bending line is the axis of the center plane located between the bending start line and the bending end line (the material does not deform on this plane). Generally, the neutral plane of isotropic materials can be approximated as the middle of the thickness direction. In actual working conditions, due to the influence of various factors, the position of the bending line usually needs to be corrected from the theoretical value.

[0081] In this embodiment, for aluminum-based composite large panels with a thickness between 0.3 and 0.6 cm, and with a protective film on the panel surface, the distance between the bending line and the honeycomb core cross-section is less than 1.5 mm.

[0082] In a preferred embodiment, when removing interfering material from the four corners of the bent plate 501, the width-direction edges 401 and 402 of the remaining adjacent side bent plates form acute angles with their respective bending lines, and the edges of the adjacent side bent plates are rounded to connect. This is to prevent sharp corners from being exposed on the edges of the bent plates after the honeycomb core has been pre-processed with rounded corners (which could easily cause injury to installers).

[0083] In a preferred embodiment, when removing the interfering material from the four corners of the bent plate 501, the width of the corner position of the bent plate is made slightly lower than the thickness of the aluminum-based composite plate, so that after the bent plate 501 is bent, its length edge 403 is not higher than the back plate, so as to avoid interference with the keel during installation.

[0084] The length of the bent plate section where "the edge is not higher than the back plate" is usually 15-50mm.

[0085] Step S3: Process an anti-detachment structure on the panel (bent plate 501) along the edge of the pre-treated aluminum-based composite large plate to prevent detachment after the panel is installed with the triangular keel.

[0086] In a preferred embodiment, the anti-detachment structure is a protrusion formed by pressing it directly onto the panel.

[0087] In one alternative embodiment, anti-detachment protrusions are formed on the panel along all four edges of the aluminum-based composite panel.

[0088] In most cases, the bending width of one set of composite panels must not exceed the thickness of the composite panel (especially the short side of composite panels with a large length-to-width ratio). The bending principle in this case is the same as above, except that the short side does not need to be formed with an anti-detachment protrusion structure.

[0089] Step S4: Bend the front panel (bent plate) along the edge of the pre-treated aluminum-based composite panel towards the back panel, as shown below. Figure 5 As shown, the bending process can be broken down into several steps. Each time, a small angle is bent, and the bending angle is gradually shaped. Finally, the required bending angle is obtained through shaping. The most common bending angle is 90°, which means that the edge panel after bending is set at a 90° angle to the main panel.

[0090] In a preferred embodiment, the angle of each bend does not exceed 15°.

[0091] Step S5: After bending the panels along all four edges of the aluminum-based composite panel, the finished aluminum-based composite panel with folded edges is obtained, such as... Figure 11 As shown.

[0092] Combination Figure 12 The folded aluminum-based composite panel includes a face plate 101, a back plate 102, and a honeycomb core 103. The honeycomb core 103 is disposed between the face plate 101 and the back plate 102, and one side of the honeycomb core 103 is connected to the face plate 101 through a first adhesive layer, while the other side of the honeycomb core 103 is connected to the back plate 102 through a second adhesive layer. The face plate 101, back plate 102, and honeycomb core 103 are all made of aluminum. The first and second adhesive layers are made of polymer hot melt adhesive film.

[0093] The panel 101 is bent towards the back panel from all sides to form a bent plate 501. The bent plate 501 should be as close as possible to the cross-section of the honeycomb core, that is, the distance d between the bent plate 501 and the cross-section of the honeycomb core 103 should be as small as possible, preferably a perfect fit. In a preferred embodiment, d < 1.5 mm.

[0094] The bending plate 501 is provided with several protrusions 502 for preventing detachment after installation with the triangular keel.

[0095] In one alternative embodiment, the bending plate 501 is arranged perpendicularly or nearly perpendicularly to the main body of the panel 101.

[0096] In a preferred embodiment, the protrusions 502 are evenly spaced on the bending plate 501.

[0097] In one preferred embodiment, the folded composite panel is a rectangular structure; in another preferred embodiment, the folded composite panel is of other shapes, including but not limited to triangles, pentagons, hexagons, etc.

[0098] In one optional embodiment, the anti-detachment protrusion structure is formed only on a portion of the bent sections of the composite panel, while the remaining bent sections do not require the formation of anti-detachment protrusion structures (especially the short side of the composite panel with a large length-to-width ratio does not require the formation of anti-detachment protrusion structures).

[0099] Combination Figure 13 The corner of the bent plate of the folded composite panel is fitted with the honeycomb core and does not protrude beyond the pre-processed rounded corners of the honeycomb core. The upper edge 403 of the bent plate at the corner is slightly lower than the back plate of the aluminum-based composite panel.

[0100] The edges 401 and 402 of two adjacent bent plates at the corner form a V-shaped structure, and the bottom of the V-shaped structure is arc-shaped. The corner of the main body of the folded composite panel is complete and without gaps, such as... Figure 13 As shown at point T in the middle.

[0101] In existing technology, conventional bending processes do not allow the two bending lines on adjacent sides to intersect. Therefore, when bending two right-angled sides, a rectangular notch with a side length no less than the sheet wall thickness plus the bending radius will inevitably appear at the corner. Figure 14 As shown at point Q. This notch, after the four panels are joined together, will leave a hole of 600mm in the ceiling finish surface, with an area four times that of a single notch. Figure 15 As shown in (a).

[0102] In this embodiment, by using a cross-bending design of the bending lines and a step-by-step bending process that bends at only a small angle each time, the bending lines on adjacent perpendicular sides have a certain amount of interference during bending. This allows the good ductility of aluminum to create a slight drawing effect at the corners during bending, eliminating the notch and resulting in a complete corner of the main panel after bending. After splicing four 700mm folded composite panels made using this method, there is no notch at the center M, resulting in a flat and aesthetically pleasing finish. Figure 15 As shown in (b).

[0103] The folded composite panel prepared in this embodiment can be used for suspended ceilings. For example... Figure 16 and Figure 17 As shown, the suspended ceiling includes a triangular keel 801. Two adjacent bent composite panels 501 prepared in this embodiment are joined together and inserted into the triangular keel 801. Protrusions 502 on the two bent panels 501 are secured within the triangular keel 801. The triangular keel 801 is connected to the main keel 803 via a hanger 802, and the main keel 803 is suspended below the ceiling.

[0104] After splicing together four folded composite panels (700mm each) made using the method described in this embodiment, there is no gap in the center, resulting in a flat and aesthetically pleasing finish.

[0105] The folded composite panel prepared in this embodiment can be used not only in decorative ceilings, but also in walls and other fields, with a wide range of applications.

[0106] It should be understood that although quantifiers such as "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit.

[0107] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0108] The above description is merely a preferred embodiment of this application and does not constitute any limitation on this application in any form or substance. It should be noted that those skilled in the art can make several improvements and additions without departing from the method of this application, and these improvements and additions should also be considered within the scope of protection of this application. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of this application are equivalent embodiments of this application; furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of this application still fall within the scope of the technical solution of this application.

Claims

1. A folded composite panel comprising a face sheet, a back sheet and a core layer disposed between the face sheet and the back sheet, characterized in that, The panel comprises a panel body part arranged opposite to the back plate, and a panel outer ring part arranged at the outer edge of the panel body part and connected with the panel body part as a whole; the panel outer ring part is bent towards the back plate to form a bent plate; the bent line part of the bent plate is designed to intersect, and the micro deep drawing effect is achieved through the step-by-step bending process, so that the corner part of the panel body part is smooth without gaps; the corner part of the bent plate and the corner part of the back plate are not higher than the back plate.

2. The edge-folded composite panel of claim 1, wherein, The corner parts of the back plate, the core layer and the bent plate are all rounded; the corner part of the bent plate is attached to the corner part of the core layer and does not protrude out of the rounded corner of the core layer.

3. The edge-folded composite panel of claim 1, wherein, The bent plate body part of at least one pair of opposite edges of the bent edge composite large plate is higher than the back plate; At least one pair of opposite edges of the bent plate is higher than the part of the back plate, and a anti-off structure for positioning and clamping is arranged on the part.

4. The edge-folded composite panel of claim 1, wherein, The bent plate and the panel body part form a set angle.

5. The edge-folded composite panel of claim 1, wherein, The distance between the bent plate and the cross section of the core layer is less than 1.5mm.

6. A method of processing a hem-finished composite panel, characterized by, The steps are: Step S1: preparing a composite large plate; The composite large plate comprises a panel, a back plate and a core layer, the core layer is arranged between the panel and the back plate, one side of the core layer is connected with the panel through a first adhesive layer, and the other side of the core layer is connected with the back plate through a second adhesive layer; Step S2: pre-processing the edge of the composite large plate; The back plate, the first adhesive layer and the core layer of the outer edge of the composite large plate are removed, and the panel is reserved for folding; the panel reserved for folding at the outer edge of the composite large plate is defined as a bent plate; The material of the corner part of the bent plate that will interfere during folding is removed; The bent line part of the adjacent two side bent plates is made to intersect, so that the micro deep drawing effect is achieved during folding, and the corner part of the panel body part at the surrounding part of the adjacent side bent plates after folding is complete and gapless; Step S3: forming an anti-off structure for positioning and clamping on the bent plate; Step S4: folding the bent plate to the back plate side of the composite large plate, and the folding process is divided into several steps to complete, and the folding angle is gradually formed from small to large; Step S5: after the panel of each edge of the composite large plate is folded and formed, a bent edge composite large plate is obtained, and due to the micro deep drawing effect of the gradual forming process, the corner part of the panel body part of the obtained bent edge composite large plate is smooth and gapless.

7. The method of processing a folded composite panel according to claim 6, wherein, In step S1, the composite large plate is produced by continuous forming process.

8. The method of processing a folded composite panel of claim 6, wherein, In step S2, during pre-processing, the width of the corner part of the bent plate is not greater than the sum of the thicknesses of the core layer and the back plate, so that the corner part of the bent plate after folding is not higher than the back plate; the width of the bent plate body part of at least one pair of opposite edges of the composite large plate is greater than the sum of the thicknesses of the core layer and the back plate, so that the bent plate body part of at least one pair of opposite edges of the bent plate after folding is higher than the back plate; the corner parts of the back plate and the core layer are processed to be rounded, and the corner parts of the bent plate where the interfering material is removed are also processed to be rounded; The distance between the bent line and the cross section of the core layer is less than 1.5mm.

9. The method of processing a folded composite panel of claim 8, wherein, In step S3, the anti-off structure is arranged on the part of the bent plate that is higher than the back plate after folding.

10. A ceiling, characterized in that The corrugated composite large plate comprises a triangular keel and the corrugated composite large plate as claimed in any one of claims 1-4, the bent plates of two adjacent corrugated composite large plates are attached and inserted into the triangular keel, and the anti-falling structure on the bent plate is clamped in the triangular keel.

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