Metal plate and manufacturing method therefor, and device

Abstract

A metal plate and a manufacturing method therefor. The manufacturing method for the metal plate comprises the following steps: I, providing a cut porous plate, wherein the porous plate comprises a core plate and panels covering two sides of the core plate, a plurality of holes are formed in the core plate, the porous plate is provided with a plurality of cutting side surfaces, the plurality of cutting side surfaces are located between the outer surfaces of the panels on the two sides, and each cutting side surface is provided with recessed portions formed upon cutting part of the holes; II, providing edge sealing strips matched with cutting surfaces; III, coating the cutting surfaces with a first adhesive layer, wherein the first adhesive layer comprises a PUR hot-melt adhesive; IV, applying a second adhesive to the cutting surfaces coated with the PUR hot-melt adhesive layer, wherein the second adhesive comprises a hot-melt adhesive; and V, pressing the edge sealing strips onto the cutting surfaces onto which the hot-melt adhesive has been applied, and curing.

Description

Metal plate and preparation method and equipment thereof Related applications

[0001] This disclosure claims priority to Chinese Patent Application No. 2023116482516, filed on December 5, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention belongs to the field of furniture accessories and relates to a metal plate and a preparation method and equipment thereof, in particular to a preparation method of a honeycomb metal plate and an edge sealing equipment of a honeycomb sandwich metal plate. Background Art

[0003] Traditional furniture panels are mostly wooden boards, but wooden boards are prone to mold, insect damage and poor waterproofing. Metal panels have gradually replaced wooden boards as furniture panels due to their excellent physical and chemical properties. In particular, metal panels can overcome problems such as mold, insect damage and poor waterproofing. Among them, honeycomb panels have high compressive strength and are light in weight. They are a type of metal panel suitable for use as furniture panels. Honeycomb panels include a core panel, which is a porous panel, typically an aluminum honeycomb panel, with a plurality of holes, which can be hexagonal or other shapes. The honeycomb panel also includes at least two layers of panels, which are covered on the upper and lower surfaces of the core panel to form a laminated panel of at least three layers. After the laminated panel is cut and processed, it is necessary to use edge sealing technology to process its cut surface to improve its aesthetics and prevent dust from entering. The present disclosure provides a metal panel using a porous core panel and a preparation method thereof, which comprehensively considers the aesthetics of the panel and the edge sealing strength. The above information disclosed in the background technology section is only used to enhance the understanding of the background of this application, so it may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0004] The present disclosure relates to a metal plate and a preparation method thereof, in particular to an edge sealing method for a honeycomb metal plate. The cut side edges of the prepared honeycomb metal plate are sealed by edge sealing strips, and the edge sealing strips are flush with the edges of the metal plate. The edge sealing strips do not need to be and will not be attached to the upper and lower surfaces of the metal plate, but only fit the cut side surfaces. The appearance is smooth and beautiful, and the edge sealing strength is relatively high.

[0005] A first aspect of the present disclosure provides a method for preparing a metal plate, which includes the following steps: I - providing a cut porous plate, wherein the porous plate includes a core plate and panels covering both sides of the core plate, the core plate has a plurality of holes, and the porous plate has a plurality of cut side surfaces, the plurality of cut side surfaces are located between the outer surfaces of the panels on both sides, and the cut side surfaces have a recessed portion formed by cutting part of the core plate holes; II - providing an edge banding strip adapted to the cut surface; III - applying a first adhesive layer on the cut surface, the first adhesive layer including PUR hot melt adhesive; IV - applying a second adhesive to the cut surface coated with the PUR adhesive layer, the second adhesive including hot melt adhesive (EVA); and V - pressing the edge banding strip (using an edge banding device) onto the cut surface after applying the hot melt adhesive, and curing it.

[0006] In one embodiment, in step III, the PUR hot melt adhesive is applied to the cut surface using a roller. In one embodiment, in step IV, the hot melt adhesive is applied to the first adhesive layer using a glue injection machine. In one embodiment, in step V, the edge banding is cooled and solidified. In one embodiment, the width W of the edge banding satisfies the following relationship: d1 < D ≤ (d1 + 2 × d2), where d1 represents the thickness of the core panel and d2 represents the thickness of the panel. In one embodiment, the thickness of the first adhesive layer is 0.1-0.5 mm. In one embodiment, the second adhesive is applied to a thickness of 2-7 mm. In one embodiment, the PUR hot melt adhesive comprises PUR polyurethane hot melt adhesive. In one embodiment, the second adhesive layer comprises EVA hot melt adhesive. In one embodiment, the core panel comprises a metal honeycomb panel, and the holes are hexagonal holes; the edge banding comprises PVC or ABS edge banding. In one embodiment, the metal honeycomb panel is an aluminum or steel honeycomb panel.

[0007] In one embodiment, the panel comprises galvanized steel, stainless steel, aluminum, or colored steel. In a specific embodiment, the galvanized colored steel is preferably formed with a thickness of 0.2 mm to 2.0 mm. In one embodiment, the ink printing layer, specifically a UV ink printing layer, is formed on the topcoat layer using 3D printing ink. The UV ink printing layer is formed by printing a patterned UV ink and has a thickness of 5 μm to 50 μm. In one embodiment, a protective layer is provided on the ink printing layer. The protective layer can be a UV clear lacquer with a thickness of 5-30 μm or a PET film with a thickness of 50-125 μm. In one embodiment, the panel comprises a topcoat layer, a primer layer, a first pre-chemical treatment layer, a first galvanized layer, a metal material, a second galvanized layer, a second pre-chemical treatment layer, and a backcoat layer, arranged in sequence. The metal material comprises steel, and the backcoat layer is fixed to the core panel. The topcoat layer can be a single-color or multi-color aluminum powder paint layer with a thickness of 10 μm to 30 μm.

[0008] The second aspect of the present disclosure provides a metal plate, comprising: a porous plate comprising a core plate, a panel covering the upper and lower portions of the core plate, the honeycomb core plate having a plurality of holes; and an edge banding strip, which is applied to the cut sides of the porous plate; wherein the plurality of cut sides are located between the outer surfaces of the upper and lower panels, and the cut sides have recessed portions formed after the core plate holes are cut; the edge banding strip is fixed to the cut sides by an adhesive layer, wherein the adhesive layer comprises a first adhesive layer applied to the cut sides and a second adhesive layer located between the first adhesive layer and the edge banding strip, the first adhesive layer comprising PUR hot melt adhesive, and the second adhesive comprising EVA hot melt adhesive. In one embodiment, the width W of the edge banding strip satisfies the following relationship: d1<D≤(d1+2×d2), wherein d1 represents the thickness of the core plate, and d2 represents the thickness of the panel. In one embodiment, the edge banding comprises a PVC or ABS edge banding, the PUR hot melt adhesive comprises a PUR polyurethane hot melt adhesive, and the second adhesive layer comprises an EVA hot melt adhesive layer. In one embodiment, the panel comprises a metal layer and a topcoat layer coated on the outer surface of the metal layer, the topcoat layer being printed with an ink layer and a varnish protective layer or a PET protective layer. In one embodiment, the panel comprises a topcoat layer, a primer layer, a first pre-treatment layer, a first galvanized layer, a metal layer, a second galvanized layer, a second pre-treatment layer, and a backcoat layer, arranged in sequence. The metal layer comprises a steel plate, the backcoat layer is secured to the core plate, the ink layer is disposed on the topcoat layer, and a protective layer is provided on the ink layer.

[0009] In one embodiment, the metal plate is prepared by the above-mentioned preparation method, which adopts the metal plate edge sealing equipment described in Chinese patent CN202311648251.6.

[0010] In the method disclosed herein, the cut sides of a honeycomb panel or other porous panel are sealed with edge banding strips, and the edge banding strips are flush with the edges of the porous panel. The edge banding strips do not need to be and will not be attached to the upper and lower surfaces of the porous panel but only fit the cut sides, resulting in a smooth and beautiful appearance and high edge banding strength.

[0011] Among them, the cut side of the porous plate after cutting forms a recessed part after the holes are cut, resulting in a very small contact area between the cut side and the edge banding strip, and the bonding strength between the two will be relatively low. In response to this difficulty, the present invention adopts a combination of two adhesives when sealing the edges. Specifically, a layer of PUR hot melt adhesive is first coated on the cut side, and the PUR hot melt adhesive layer is attached to the material section between the holes (typically the section of a thin-walled sheet). On this basis, EVA hot melt adhesive is applied on the PUR hot melt adhesive, and the EVA hot melt adhesive is extruded into a continuous strip or cylindrical shape, thereby adhering to the PUR hot melt adhesive and crossing the recessed part; as the edge banding strip is pressed onto the cut side by the edge banding equipment, the EVA hot melt adhesive is pressurized and enters the recessed part under the action of its own leveling; after curing, the edge banding strip can be firmly attached to the cut side of the porous plate, and the edge banding strip will not exceed the two side surfaces of the porous plate, and the appearance is beautiful and integrated.

[0012] A third aspect of the present disclosure provides a honeycomb sandwich metal panel edge-sealing device, such as an aluminum honeycomb sandwich metal panel edge-sealing device.

[0013] In one embodiment, the edge banding device includes a conveying mechanism, a pre-milling mechanism, a gluing mechanism, an edge banding conveying mechanism, and a drying mechanism. The conveying mechanism is used to clamp and convey the aluminum honeycomb sandwich metal plate. The pre-milling mechanism is used to mill the edges of the aluminum honeycomb sandwich metal plate so that the protruding heights of the metal plates on both sides of the aluminum honeycomb are equal and there are no burrs. The gluing mechanism is used to apply glue to the side edges of the cut surface of the metal plate.

[0014] The aluminum honeycomb sandwich metal plate edge sealing device further includes a glue injection mechanism disposed between the glue coating mechanism and the edge banding mechanism, the glue injection mechanism being used to inject glue liquid onto the PUR hot melt adhesive and into the groove (i.e., the recessed portion of the cut side surface), the glue injection mechanism including a first fixed seat, a first movable seat movably connected to the first fixed seat, a support rod disposed on the top of the first movable seat and extending upward, a support block rotatably and movably mounted on the support rod, and a glue injection unit connected to the support block;

[0015] The glue injection unit includes a glue injection pump connected to the support block, a glue injector connected to the bottom of the glue injection pump, a glue tube connected to the rear of the glue injection pump, and a nozzle provided at the front end of the glue injector. The nozzle is cylindrical and located in front of the glue injection pump. The diameter of the nozzle is less than or equal to the groove width of the groove. The glue injection pump is used to pump the glue in the glue tube into the glue injector and spray it out through the nozzle.

[0016] In one embodiment, the edge sealing device may further include a preheating mechanism. In one embodiment, the rear end of the glue injection pump is connected to a glue injection amount adjustment rod extending horizontally backward. In one embodiment, the side wall of the support block is provided with at least two top screw holes, and the top screw holes are threadedly connected with a top screw for tightening the support rod, and the axis lines of the two top screw holes are perpendicular to each other. In one embodiment, the glue injection unit further includes a rotating plate, a first screw, a first glue cap and a first nut, the rotating plate is rotatably connected to the top of the support rod, the rotation axis line of the rotating plate is the axis line of the support rod, the first screw passes through the rotating plate and the support block in the up and down direction and is threadedly connected to the support block, the first glue cap is connected to the upper end of the first screw and is located above the support block, the first nut is sleeved on the first screw and is threadedly connected to the first screw, and the first nut is tightened to the upper surface or lower surface of the support block.

[0017] In one embodiment, the first fixed seat includes a first flat plate parallel to the horizontal plane and a first vertical plate connected to the upper surface of the first flat plate and extending upward, there are three first vertical plates, and these three first vertical plates form a first trough-shaped structure with a first opening, the first movable seat includes a second flat plate arranged parallel to and above the first flat plate and a second vertical plate connected to the lower surface of the second flat plate and extending downward, the second flat plate is higher than the first vertical plate, there are three second vertical plates, these three second vertical plates form a second trough-shaped structure with a second opening, the second opening is opposite to the direction of the first opening, the opening width of the second opening is larger than the opening width of the first opening, and the second trough-shaped structure is inverted on the first trough-shaped structure.

[0018] In one embodiment, the first movable base further comprises a first sliding rod extending in a front-to-back direction and passing through the second vertical plate. A first sliding sleeve is embedded in the first vertical plate. The first sliding rod is axially slidably mounted on the first sliding sleeve, enabling the second slotted structure to move forward and backward relative to the first slotted structure. In one embodiment, a second screw rod extending in a front-to-back direction is threadedly mounted on the second vertical plate. The second screw rod is threadedly connected to the second vertical plate. One end of the second screw rod abuts against the first vertical plate, and the other end is connected to a second rubber cap. In one embodiment, the first movable base further comprises a movable plate movably connected to the upper surface of the second flat plate. The lower end of the support rod is connected to the upper surface of the movable plate. In one embodiment, the pre-milling mechanism comprises a pre-milling support base extending in a front-to-back direction, a first mounting plate movably connected to the left and right sides of the pre-milling support base, a second mounting plate movably connected to the outer side of the first mounting plate, an angle adjustment base rotatably connected to the outer side of the second mounting plate, a pre-milling motor connected to the angle adjustment base, and a pre-milling cutter driven by the pre-milling motor.

[0019] In one embodiment, the pre-milling support seat is provided with a first motor and a screw pair for driving the first mounting plate to move up and down. The first mounting plate is connected to a first cylinder for driving the second mounting plate to move forward and backward. The first cylinder is located behind the second mounting plate. In one embodiment, the end of the cylinder rod of the first cylinder is connected to an adapter seat. The second mounting plate is connected to an outwardly protruding adjustment block. A third screw extending in the front-to-back direction is rotatably passed through the adjustment block. The third screw is connected to the adapter seat via the adjustment plate. The front end of the third screw passes through the upper end of the adjustment plate and is threadedly connected to the adjustment plate. The lower end of the adjustment plate is connected to the adapter seat. In one embodiment, the adjustment plate is a long thin plate. When the second mounting plate moves forward, if the resistance encountered by the second mounting plate is greater than a set value, the adjustment plate bends to absorb the driving force provided by the first cylinder.

[0020] In one embodiment, the outer side surface of the first mounting plate is connected to a slide rail extending in the front-to-back direction, wherein the slide rails are at least two and spaced apart in the vertical direction, and each slide rail is provided with at least two sliders. The adapter is connected to the slider at the rear end of the lowest slide rail, and the second mounting plate is connected to the remaining sliders. In one embodiment, the angle adjustment seat is L-shaped in the vertical direction, and the angle adjustment seat includes a first side plate and a second side plate connected vertically. The first side plate is rotatably connected to the second mounting plate via a pin, and the pin is located at the front upper portion of the first side plate. The second side plate is used to mount the pre-milling motor. The first side plate is also provided with an arcuate groove in the middle portion, the center of the arcuate groove falling on the axis of the pin. A locking bolt threadedly connected to the second mounting plate is inserted into the arcuate groove.

[0021] In one embodiment, the bottom wall of the first side plate defines an upwardly recessed adjustment slot, and the second mounting plate is connected to an outwardly protruding top block, which is positioned within the adjustment slot. In one embodiment, a stopper is connected to the first side plate, located on one side of the adjustment slot. An angle adjustment bolt is threadedly connected to the top block, with the end of the angle adjustment bolt abutting against the stopper. In one embodiment, the pre-milling cutter comprises a cylindrical cutter body and a blade embedded in the outer wall of the cutter body. The blade comprises an upper blade and a lower blade, and the spacing between the upper and lower blades in the axial direction of the cutter body is less than or equal to the thickness of the aluminum honeycomb.

[0022] In one embodiment, the aluminum honeycomb sandwich metal plate edge sealing equipment also includes a notching mechanism, which is used to slot the aluminum honeycomb sandwich metal plate after edge sealing. The notching mechanism includes a notching support seat, a second movable seat that can be moved up and down on the notching support seat, a third movable seat that can be moved forward and backward on the second movable seat, a notching motor connected to the third movable seat, and a notching knife driven by the notching motor.

[0023] The cam is secured to the rear of the second support frame and is adapted to slide in a direction of rotation therethrough, the cam being secured to the rear of the second support frame and adapted to slide in a direction of rotation therethrough.

[0024] In one embodiment, a fourth screw is passed through the top plate of the slotted support seat, and the fourth screw is threadedly connected to the top plate of the slotted support seat. The lower end of the fourth screw is pressed against the upper end surface of the second movable seat. The slotting mechanism also includes a second cylinder, the cylinder body of the second cylinder is connected to the rear surface of the rear sealing plate, and the cylinder rod of the second cylinder passes through the rear sealing plate and is connected to the U-shaped protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 is a schematic diagram of the structure of a metal plate according to an embodiment of the present disclosure; Figure 2 is a schematic diagram of the structure of a panel according to an embodiment of the present disclosure; Figure 3 is a schematic diagram of the structure of a porous plate according to an embodiment of the present disclosure; Figure 4 is a schematic diagram of one cut side of a porous plate according to an embodiment of the present disclosure; Figure 5 is a schematic diagram of one cut plane of a porous plate when coated with PUR hot melt adhesive according to an embodiment of the present disclosure; Figure 6 is a schematic diagram of a partially cut side of a porous plate after coating with PUR hot melt adhesive according to an embodiment of the present disclosure; Figure 7 is a schematic diagram of a partially cut side of a porous plate after applying EVA adhesive according to an embodiment of the present disclosure; Figure 8 is a schematic diagram of the layout of a preferred embodiment of the present invention; Figure 9 is a perspective schematic diagram of the glue injection mechanism in Figure 8. Figure 10 is a perspective schematic diagram of the glue injection mechanism in Figure 8, with the viewing angle adjusted for ease of viewing. Figure 11 is a schematic diagram of the left side of Figure 9, with the second vertical plate not shown. Figure 12 is a perspective schematic diagram of the pre-milling mechanism in Figure 8. Figure 13 is a perspective schematic diagram of the pre-milling mechanism in Figure 8, with the viewing angle adjusted for ease of viewing. Figure 14 is a schematic diagram of the right side of Figure 12. Figure 15 is a schematic diagram of the right side of Figure 12, with the angle adjustment seat not shown. Figure 16 is a schematic diagram of the right side of Figure 12, with the angle adjustment seat and second mounting plate not shown. Figure 17 is a schematic diagram of the right side of Figure 12, with the angle adjustment seat, second mounting plate, and first mounting plate not shown. Figure 18 is a perspective schematic diagram of the slotting mechanism in Figure 8. Figure 19 is a perspective schematic diagram of the slotting mechanism in Figure 18, with the viewing angle adjusted for ease of observation. Figure 20 is a perspective schematic diagram of the slotting mechanism in Figure 8, with the slotted dust hood not shown. Among them, 100 - porous board; 101 - cut side; 102 - recessed part; 110 - core board; 111 - hole; 112 - thin-walled sheet; 120 - panel; 121 - topcoat layer; 122 - primer layer; 123 - first pretreatment layer; 124 - first galvanized layer; 125 - metal layer; 126 - second galvanized layer; 127 - second pretreatment layer; 128 - back paint layer; 200 - edge banding; 300 - PUR hot melt adhesive; 400 - second adhesive (EVA hot melt adhesive); 500 - ink printing layer; 600 - protective layer. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present disclosure are described in detail below with reference to the accompanying drawings so that the advantages and features of the present disclosure can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present disclosure, but does not constitute a limitation of the present disclosure.

[0028] The following embodiments relate to a method for preparing a metal plate having a porous core structure, typically a metal honeycomb panel with a honeycomb structure, which offers the advantages of lightweight yet high strength. This metal honeycomb panel is particularly suitable for furniture, replacing traditional wood panels. In one embodiment, the metal plate is a color-coated metal plate printed with a pattern or specific color, and can be used as a decorative panel for furniture, particularly for household appliances, such as refrigerator doors.

[0029] Figure 1 shows the structure of one type of metal plate. Referring to Figure 1 , the metal plate includes a porous plate 100, which serves as the skeleton of the metal plate and provides good strength for the metal plate as a whole. As shown in Figures 3 and 4 , the porous plate 100 includes a core plate 110 and panels 120 covering both sides of the core plate 110. The core plate 110 has a plurality of holes 111, which extend from the first surface of the core plate 110 to the second surface of the core plate 110. The first surface and the second surface are located on opposite sides of the core plate, such as the upper and lower surfaces in Figure 3 . The core plate 110 is entirely formed of thin-walled sheets 112, which are cross-connected to enclose the aforementioned plurality of holes 111. In a typical embodiment, the core plate 110 is a metal honeycomb panel, formed by cross-connected metal sheets. The metal honeycomb panel can be an aluminum honeycomb panel or a steel honeycomb panel. The aluminum or steel sheets cross to form a plurality of hexagonal holes 111, forming a "honeycomb"-like structure. Panels 120 are respectively covered on the first surface and the second surface of the chip, and the core board 110 is enclosed between the two layers of panels 120 .

[0030] The panel 120 is fixed to the surface of the core panel 110 via an adhesive. As shown in Figure 2 , the panel 120 includes a metal layer 125 and a topcoat layer 121 coated on the outer surface of the metal layer 125. The topcoat layer 121 is printed with an ink layer 500. In one specific embodiment, the panel includes, in sequence, a topcoat layer 121, a primer layer 122, a first pre-treatment layer 123, a first galvanized layer 124, a metal layer 125, a second galvanized layer 126, a second pre-treatment layer 127, and a back-coat layer 128. The metal layer 125 can be a steel plate. The first galvanized layer 124 and the second galvanized layer 126 on both sides of the steel plate prevent corrosion of the steel plate. A passivating agent is applied to the first galvanized layer 124 for corrosion protection, forming a first pre-treatment layer 123. An anti-corrosion primer is applied to the first pre-treatment layer 123 and cured to form a primer layer 122. A topcoat, such as aluminum paint, is applied to the primer layer 122 and cured to form a topcoat layer 121. A passivating agent is applied to the second galvanized layer 126 for corrosion protection, forming a second pre-treatment layer 127. An anti-corrosion backcoat is applied to the second pre-treatment layer 127 and cured to form a backcoat layer 128. Backcoat layer 128 is secured to the core board 110, for example, by gluing it to the top or bottom surface of the core board 110. An ink printing layer 500 is disposed on the topcoat layer 121. In one embodiment, UV (ultraviolet) curable ink is printed on the topcoat layer 121 using 3D digital printing technology and then cured by irradiation with a light source to form the desired pattern, color, etc. A protective layer 600 is provided on the ink printing layer 500 to provide a special tactile or visual effect. It can be a matte nano-skin-feeling layer, or a transparent varnish protective layer 600, a high-gloss protective layer 600, or a writing protective layer 600, etc.

[0031] The metal plate also includes an edge banding 200, which covers the cut side 101 of the porous plate 100. The porous core plate 110 is completely enclosed between the panels 120 on both sides and the surrounding edge banding 200 to prevent foreign matter such as moisture and dust from entering the holes 111 of the core plate 110. The multiple cut side surfaces 101 are located between the outer surfaces of the panels 120 on both sides, specifically between the upper surface of the upper panel 120 and the lower surface of the lower panel 120. As shown in Figure 3, the porous plate 100 typically has four cut side surfaces 101. As shown in Figure 4, the cut side surfaces 101 have a plurality of recessed portions 102, which are formed when part of the holes 111 are cut when the core plate 110 is cut. In addition to the recessed portion 102, the trimmed side 101 also includes the cross-sections of the two panels 120 and the cross-section of the thin-walled sheet 112 that forms the holes 111 of the core panel 110. The width W of the edge banding 200 satisfies the following relationship: d1<D≤(d1+2×d2), where d1 represents the thickness of the core panel 110 and d2 represents the thickness of the panel 120. In other words, the width of the edge banding 200 does not exceed the thickness of the porous plate 100, and is preferably equal to the thickness. In this way, after the edge banding 200 is attached to the trimmed side 101, the upper edge of the edge banding 200 is flush with the upper surface of the upper panel 120, and the lower edge of the edge banding 200 is flush with the lower surface of the lower panel 120, and the edge banding 200 does not extend beyond the upper and lower panels 120, 120. The length of the edge banding 200 is equal to the length of the cut side 101 (the dimension of the cut side 101 along the left-right direction in FIG4 ), and the width D is preferably equal to the width of the cut side 101 (the dimension of the cut side 101 along the up-down direction in FIG4 ).

[0032] The edge banding 200 is secured to the trimmed side 101 via adhesive layers. The adhesive layers include a first adhesive layer applied to the trimmed side 101 and a second adhesive layer located between the first adhesive layer and the edge banding 200. The first adhesive layer comprises PUR (Polyurethane Reactive) adhesive, while the second adhesive 400 comprises EVA hot melt adhesive. The PUR hot melt adhesive 300 is a moisture-curing reactive polyurethane hot melt adhesive, which offers excellent bonding strength, good temperature resistance, chemical resistance, and aging resistance. The second adhesive 400 can be EVA (Ethylene Vinyl Acetate) hot melt adhesive. In this embodiment, the edge banding 200 is made of PVC (polyvinyl chloride) or ABS (acrylonitrile (A)-butadiene (B)-styrene (S) terpolymer). The thickness of the edge banding 200 is 0.4-3.0 mm.

[0033] The method for preparing the metal plate comprises the following steps:

[0034] I - Providing a cut porous plate 100, wherein the porous plate 100 includes a core plate 110 and face plates 120 covering both sides of the core plate 110, the core plate 110 having a plurality of holes 111, and the porous plate 100 having a plurality of cut side surfaces 101, the plurality of cut side surfaces 101 being located between the outer surfaces of the face plates 120 on both sides, and the cut side surfaces 101 having recessed portions 102 formed by cutting out portions of the holes 111;

[0035] II - providing edge banding 200 adapted to the cut surface;

[0036] III - applying a first adhesive layer on the cut surface, the first adhesive layer comprising PUR hot melt adhesive 300;

[0037] IV - applying a second adhesive 400 onto the cut surface coated with the PUR hot melt adhesive layer, wherein the second adhesive 400 comprises (EVA) hot melt adhesive; and

[0038] V - Press the edge banding strip 200 (using edge banding equipment) onto the cut surface after applying the hot melt adhesive and cure it.

[0039] In step I, the porous plate 100 is at least a three-layer structure, comprising two face sheets 120 and an aluminum honeycomb panel or steel honeycomb panel sandwiched between the two face sheets 120. The porous plate 100 is cut to the desired specifications, and four cut sides 101 are formed on the cut porous plate 100. Each cut side 101 has a recessed portion 102 formed by cutting away a portion of the honeycomb panel's pores 111, as shown in FIG5 .

[0040] In step II, a PVC or ABS edge banding 200 with a thickness of 0.4-3.0 mm is used. This edge banding is in roll form before cutting and is cut according to the length of the cut side 101. The width W of the edge banding 200 satisfies the following relationship: d1 < D ≤ (d1 + 2 × d2), where d1 represents the thickness of the core panel 110 and d2 represents the thickness of the face panel 120.

[0041] In step III, PUR hot-melt adhesive 300 is applied to the cut surface using a roller. Specifically, the PUR hot-melt adhesive 300 is applied to the cut side surface 101 using a coating roller, as shown in Figure 6 . At this point, the PUR hot-melt adhesive 300 adheres to the material section between holes 111 (typically, the section of thin-walled sheet 112 ). The coating thickness of the PUR hot-melt adhesive 300 is 0.1-0.5 mm.

[0042] In step IV, a second adhesive, EVA hot melt adhesive 400, is applied to the first adhesive layer using an adhesive injection machine. As shown in Figure 7 , the adhesive injection machine injects adhesive onto the PUR hot melt adhesive 300, with the second adhesive 400 applied as an injection over the cut side surface and spanning the entire cut side surface along its length. That is, a portion of the second adhesive 400 adheres to the PUR hot melt adhesive 300 on the material cross-section and spans the recessed portion 102. When the edge banding 200 is not pressed against it, a portion of the second adhesive 400 hangs suspended above the recessed portion 102. The injection width of the second adhesive 400 is less than the thickness of the porous plate 100, and preferably less than the thickness of the core plate 110. The applied thickness / height of the second adhesive 400 (the vertical dimension of the injection in Figure 7 ) is 2 to 7 mm.

[0043] In step V, as the edge banding 200 is pressed against the cut side 101, the hot melt adhesive is pressed and leveled into the recessed portion 102, bonding the edge banding 200 to the EVA and PUR hot melt adhesives. After cooling and solidifying, the edge banding 200 is securely attached to the cut side 101 of the porous plate 100.

[0044] In one embodiment, the metal plate edge banding equipment described in Chinese patent CN202311648251.6 is used to implement the above-mentioned preparation method to prepare the metal plate.

[0045] Comparative Example: The preparation method used in this comparative example differs from that used in the example only in the order of steps III and IV: EVA hot-melt adhesive is first applied to the cut side surface 101, followed by a layer of PUR hot-melt adhesive 300; all other aspects are the same as in the example. The edge banding strip 200 produced in this comparative example was not firmly bonded to the metal sheet and did not meet the required edge banding strength. Analysis revealed that the application of the PUR hot-melt adhesive 300 caused the adhesive roller to remove some of the EVA adhesive, resulting in a weak bond.

[0046] If only EVA hot melt adhesive or PUR hot melt adhesive 300 is used to adhere the edge banding strip 200, the adhesion may not be strong enough and the edge banding strip 200 may be easily torn off.

[0047] In the preparation method of the embodiment, the cut side 101 of the porous plate 100 such as the honeycomb plate is edge-sealed by the edge banding strip 200, and the edge banding strip 200 is flush with the edge of the porous plate 100. The edge banding strip 200 does not need to and will not be attached to the upper and lower surfaces of the porous plate 100, but only fits with the cut side 101, and the appearance is flat and beautiful, and at the same time has a high edge sealing strength.

[0048] The holes 111 on the cut side 101 of the cut porous plate 100 are cut to form recessed portions, resulting in a very small contact area between the cut side 101 and the edge banding 200, and thus a relatively low bonding strength. To address this difficulty, the present disclosure employs a combination of two adhesives for edge banding. Specifically, a layer of PUR hot melt adhesive is first applied on the cut side 101, and the PUR hot melt adhesive layer is attached to the material section between the holes 111 and 111 (typically the section of the thin-walled sheet 112), and hot melt adhesive is applied on the PUR hot melt adhesive. A continuous EVA hot melt adhesive strip will adhere to the PUR hot melt adhesive film and cross the recessed portion; as the edge banding strip 200 is pressed onto the cut side 101, the EVA hot melt adhesive is pressurized and enters the recessed portion 102 under the effect of its own leveling, and the EVA hot melt adhesive is bonded to the inner wall of the hole 111 and the back of the edge banding strip; after curing, the edge banding strip 200 can be firmly attached to the cut side 101 of the porous plate 100, and the edge banding strip 200 will not exceed the two side surfaces of the porous plate 100, and the appearance is beautiful and integrated.

[0049] Figures 8 to 20 illustrate a metal plate edge-banding device, which can be used in the above-described preparation method. Steps I to V can all be performed on this edge-banding device. As shown in Figures 8 to 20, this edge-banding device is specifically an aluminum honeycomb sandwich metal plate edge-banding device, and the target material is an aluminum honeycomb sandwich metal plate. The aluminum honeycomb sandwich metal plate comprises a central aluminum honeycomb 2 and metal plates 5 clamped above and below the aluminum honeycomb 2.

[0050] The edge banding equipment includes a conveying mechanism 10, a pre-milling mechanism 20, a gluing mechanism 30, an edge banding mechanism 40, and a drying mechanism 50. The conveying mechanism 10 is used to clamp the aluminum honeycomb sandwich metal panels and drive them forward. The pre-milling mechanism 20 is used to flatten the edges of the aluminum honeycomb sandwich metal panels, ensuring that the protrusions on both sides of the aluminum honeycomb are equal in height and free of burrs, forming a groove (i.e., the aforementioned recessed portion 102). The gluing mechanism 30 is used to apply glue to the cut surface of the aluminum honeycomb sandwich metal panels using a glue roller. The gluing mechanism 30 is used to perform step III above, using PUR hot-melt adhesive. The edge banding mechanism 40 is used to convey the edge banding to the edge of the aluminum honeycomb sandwich metal panels and apply it to the panels. Once the edge banding has been applied to a predetermined length, it is cut.

[0051] The edge banding device further includes a glue injection mechanism 60 for injecting glue 1 into the groove 3. The glue injection mechanism 60 is disposed between the glue coating mechanism 30 and the edge banding mechanism 40. The glue injection mechanism 60 is used to implement the above-mentioned step IV. The glue used by the glue injection mechanism 60 is the above-mentioned second adhesive, such as EVA glue.

[0052] The glue injection mechanism 60 includes a first fixed seat, a first movable seat connected to the first fixed seat and movable forward and backward, a support rod 63 arranged on the top of the first movable seat and extending upward, a support block 64 rotatably and movable up and down on the support rod 63, and a glue injection unit 65 connected to the support block 64; the glue injection unit 65 includes a glue injection pump 651 connected to the support block 64, a glue injector 652 connected to the bottom of the glue injection pump 651, and a glue injector 653 connected to the rear of the glue injection pump 651. The liquid pipe 653 and the nozzle 654 are provided at the front end of the glue injector 652. The nozzle 654 is cylindrical and is located in front of the glue injection pump 651. The diameter of the nozzle 654 is less than or equal to the width of the groove 3. Specifically, the diameter of the nozzle 654 is two-thirds of the width of the groove 3. The end of the glue pipe 653 away from the glue injection pump 651 is inserted into the constant temperature glue barrel. The glue injection pump 651 is used to pump the glue in the glue pipe 653 into the glue injector 652 and spray it out through the nozzle 654 at the front end of the glue injector 652.

[0053] The advantage of this arrangement is that, during edge sealing, the nozzle 654 can be extended into the groove 3 to a set depth by the forward and backward movement of the first movable base. Combined with the operation of the glue injection pump 651 and the advancement of the aluminum honeycomb sandwich metal sheet, the glue 1 can be evenly injected into the groove 3. When bonding the edge banding 4, the glue 1 in the groove 3 can be used to bond the portion of the edge banding 4 located at the notch of the groove 3 to the aluminum honeycomb 2, making the bonding of the edge banding 4 more secure and achieving a better edge sealing effect. The glue 1 is the aforementioned second adhesive.

[0054] To facilitate the adjustment of the glue injection amount, in this embodiment, the rear end of the glue injection pump 651 is connected to a glue injection amount adjustment rod 655 extending horizontally backward.

[0055] In order to fix the travel path of the glue injection unit 65 when the first movable seat moves back and forth, the side wall of the support block 64 is further provided with two top screw holes 641, and the internal threads of the top screw holes 641 are connected with top screws for tightening the support rod 63, and the axial center lines of the two top screw holes 641 are perpendicular to each other.

[0056] In order to accurately control the position of the glue injection unit 65 in the up and down directions and accurately control the distance that the support block 64 moves up and down when the top screw is loosened, in this embodiment, the glue injection unit 65 also includes a rotating plate 656, a first screw 657, a first glue cap 658 and a first nut 659. The rotating plate 656 is rotatably connected to the top of the support rod 63. The rotation axis of the rotating plate 656 is the axis of the support rod 63. The first screw 657 passes through the rotating plate 656 and the support block 64 in the up and down directions and is threadedly connected to the support block 64. The first glue cap 658 is connected to the upper end of the first screw 657 so as to screw the first screw 657. The first glue The cap 658 is located above the support block 64, and the first nut 659 is sleeved on the first screw 657 and threadedly connected to the first screw 657. The first nut 659 is pressed against the upper surface of the support block 64. When adjusting, first loosen the top screw and the first nut 659, and then rotate the first glue cap 658 to drive the support block 64 to move up and down. After the support block 64 moves up and down into position, lock the first nut 659 so that it presses against the upper surface of the support block 64, and then rotate the support block 64. When it rotates to a suitable angle, lock the top screw so that the top screw presses against the support rod 63, so that the position of the support block 64 can be fixed, thereby fixing the travel path of the glue injection unit 65.

[0057] In this embodiment, the first fixed seat includes a first flat plate 611 parallel to the horizontal plane and a first vertical plate 612 connected to the upper surface of the first flat plate 611 and extending upward. The first vertical plates 612 have three pieces, and the three first vertical plates 612 form a first groove-shaped structure 614 having a first opening 613. The first movable seat includes a second flat plate 621 arranged parallel to the first flat plate 611 and a second vertical plate 622 connected to the lower surface of the second flat plate 621 and extending downward. The second flat plate 621 is higher than the first vertical plate 612. The second vertical plates 622 have three pieces, and the three second vertical plates 622 form a second groove-shaped structure 624 having a second opening 623. The opening 623 is oriented in the opposite direction to the first opening 613, the opening width of the second opening 623 is greater than the opening width of the first opening 613, and the second groove structure 624 is inverted on the first groove structure 614; the first movable seat also includes a first sliding rod 625 extending in the front-to-back direction and passing through the second vertical plate 622, and a first sliding sleeve 615 is embedded in the first vertical plate 612. The first sliding rod 625 can be axially slidably penetrated on the first sliding sleeve 615, so that the second groove structure 624 can move forward and backward relative to the first groove structure 614, and at the same time, the two sides of the first sliding rod 625 and the first sliding sleeve 615 are blocked by the first groove structure 614 and the second groove structure 624.

[0058] In order to accurately control the moving distance of the second groove structure 624 in the front-to-back direction, in this embodiment, a second screw 626 extending along the front-to-back direction is also provided on the second vertical plate 622. The second screw 626 is threadedly connected to the second vertical plate 622. One end of the second screw 626 is pressed against the first vertical plate 611, and the other end is connected to a second rubber cap 627 to facilitate the screwing of the second screw 626. A second position indicator 629 is sleeved on the second screw 626. The second position indicator 629 is located between the second vertical plate 622 and the second rubber cap 627 and is connected to the second vertical plate 622.

[0059] In order to expand the adjustment range of the support block 64, the first movable seat further includes a movable plate 628 that is movably connected to the upper surface of the second flat plate 621. The movable plate 628 is provided with a waist-shaped hole extending in the left and right directions and passing through the movable plate 628 in the up and down directions. A bolt for locking the relative position of the movable plate 628 and the second flat plate 621 is passed through the waist-shaped hole. The lower end of the support rod 63 is connected to the upper surface of the movable plate 628.

[0060] In this embodiment, the pre-milling mechanism 20 includes a pre-milling support seat 21 extending in the up and down directions, a first mounting plate 22 movably connected to the left and right sides of the pre-milling support seat 21, a second mounting plate 23 movably connected to the outer side surface of the first mounting plate 22 (the side away from the pre-milling support seat 21) for moving forward and backward, an angle adjustment seat rotatably connected to the outer side surface of the second mounting plate 23 (the side away from the first mounting plate 22), and a pre-milling motor 25 connected to the angle adjustment seat and a pre-milling cutter 26 driven by the pre-milling motor 25; specifically, the pre-milling support seat 21 is provided with a first motor 211 and a screw pair 212 (including a rotatable screw and a nut sleeved on the screw) for driving the first mounting plate 22 to move up and down, and the first mounting plate 22 is connected to a first cylinder 221 for driving the second mounting plate 23 to move forward and backward, and the first cylinder 221 is located behind the second mounting plate 23.

[0061] In order to facilitate the provision of the driving force of the first cylinder 221 to the second mounting plate 23 and to facilitate the adjustment of the distance of the second mounting plate 23 moving forward and backward, in this embodiment, the end of the cylinder rod of the first cylinder 221 is connected to the adapter seat 222, and the second mounting plate 23 is connected to the outwardly protruding adjustment block 231. The adjustment block 231 is rotatably provided with a third screw rod 232 extending in the front-to-back direction. The third screw rod 232 is connected to the adapter seat 222 through the adjustment plate 233. Specifically, the front end of the third screw rod 232 passes through the upper end of the adjustment plate 233 and is threadedly connected to the adjustment plate 233. The third screw rod 232 is connected to the adapter seat 222. The rear end of 32 extends backward, and the third screw rod 232 is connected to the third nut 234, and the third nut 234 presses against the adjusting plate 233. The lower end of the adjusting plate 233 is connected to the adapter seat 222 to realize the connection with the cylinder rod of the first cylinder 221; by twisting the third screw rod 232, the position of the adjusting plate 233 on the third screw rod can be changed, thereby adjusting the position of the second mounting plate 23 in the front and rear directions. In order to facilitate the display of the adjustment distance, a third position indicator 235 is also provided on the third screw rod 232. The third position indicator 235 is located on the outside of the adjusting block 231 and is connected to the adjusting block 231.

[0062] Furthermore, the adjustment plate 233 is a long thin plate (a plate with a length to thickness ratio of 5 to 10. Specifically in this embodiment, the length of the adjustment plate 233 is 3.2 mm and the thickness of the adjustment plate 233 is 0.4 mm). When the second mounting plate 23 moves forward, if the resistance encountered by the second mounting plate 23 (the reverse force encountered by the pre-milling cutter 26 during feeding) is greater than the set value, the driving force provided by the first cylinder 221 can be absorbed by the spontaneous bending of the adjustment plate 233 in the front-to-back direction, thereby avoiding damage to the pre-milling cutter 26.

[0063] To facilitate the forward and backward movement of the second mounting plate 23 and the adapter seat 222, in this embodiment, the outer side surface of the first mounting plate 22 (the side away from the pre-milled support seat 21) is connected to a slide rail 223 extending in the forward and backward direction. There are two slide rails 223 and they are arranged at intervals in the up and down directions. Each slide rail 223 is provided with two sliders 224. The adapter seat 222 is connected to the slider 224 located on the rear side of the slide rail 223 located below, and the second mounting plate 23 is connected to the other three sliders 224.

[0064] In this embodiment, the projection of the angle adjustment seat in the up and down directions is L-shaped, and the angle adjustment seat includes a first side plate 241 and a second side plate 242 connected vertically. The first side plate 241 is rotatably connected to the outer side surface of the second mounting plate 23 through a pin shaft 243. The pin shaft 243 is located at the front upper part of the first side plate 241. The second side plate 242 is used to install the pre-milling motor 25. The middle part of the first side plate 241 is also provided with an arc groove 244 that penetrates the first side plate 241 in the left and right directions. The center of the arc groove 244 falls on the axis center line of the pin shaft 243. A locking bolt (not shown in the figure) that is threadedly connected to the outer side surface of the second mounting plate 23 is passed through the arc groove 244.

[0065] In order to limit the rotation angle of the first side plate 241, in this embodiment, the bottom wall of the first side plate 241 is provided with an upwardly recessed adjustment groove 245, and the second mounting plate 23 is connected to a top block 236 protruding outward, and the top block 236 is located in the adjustment groove 245 to limit the rotation angle of the first side plate 241; in order to accurately control the rotation angle of the first side plate 241, further, the first side plate 241 is connected with a stop block 246, and the stop block 246 is located at the front and rear sides of the adjustment groove 245, and an angle adjustment bolt 247 is passed through the top block 236, and the angle adjustment bolt 247 is threadedly connected to the top block 236, and the rear end of the angle adjustment bolt 247 is pressed against the stop block 246 located on the rear side.

[0066] In this embodiment, the pre-milling cutter 26 includes a cylindrical cutter body 261 and a blade embedded in the outer wall of the cutter body 261, the blade including an upper blade 262 and a lower blade 263, and the spacing between the upper blade 262 and the lower blade 263 in the axial direction of the cutter body 261 is less than or equal to the thickness of the aluminum honeycomb 2.

[0067] The edge sealing equipment also includes a slotting mechanism 70, which is used to slot the aluminum honeycomb sandwich metal plates that have been edge sealed and dried for splicing. The slotting mechanism 70 includes a slotting support seat 71, a second movable seat 72 that can be moved up and down on the slotting support seat 71, a third movable seat that can be moved back and forth on the second movable seat 72, and a slotting motor 74 connected to the third movable seat and a slotting knife 75 driven by the slotting motor 74; specifically, the slotting support seat 71 extends in the up and down direction, and a rectangular through-hole 711 is provided on the slotting support seat 71, which penetrates the slotting support seat 71 in the left and right direction, and a second slide rod 712 extending in the up and down direction is set in the rectangular through-hole 711, and the second movable seat 72 is located in the rectangular through-hole 711 and can be slidably mounted therein. When the locking cam 721 is unlocked, the left and right sides of the second sliding rod 712 protrude out of the slotted support seat 71 to form a U-shaped protrusion 721. The U-shaped protrusion 721 is provided with a third sliding rod 722 extending in the front and rear directions. The front end of the third sliding rod 722 is connected to the front sealing plate 723, and the middle of the third sliding rod 722 is connected to the middle sealing plate 724. The middle sealing plate 724 is located in the U-shaped groove of the U-shaped protrusion 721. The rear end of the third sliding rod 722 is connected to the rear sealing plate 725, and the front sealing plate 723 and the middle sealing plate 724 are connected to the cross plate 726. The cross plate 726 is located on the side of the third sliding rod 722 away from the slot support seat 71. The front sealing plate 723, the middle sealing plate 724, and the cross plate 726 constitute the third moving seat, and the slotted motor 74 is connected to the side of the cross plate 726 away from the third sliding rod 722.

[0068] To facilitate the adjustment of the distance that the second movable seat 72 moves up and down, in this embodiment, a fourth screw 713 is passed through the top plate of the slotted support seat 71, and the fourth screw 713 is threadedly connected to the top plate of the slotted support seat 71. The lower end of the fourth screw 713 is pressed against the upper end surface of the second movable seat 72. Furthermore, the upper end of the fourth screw 713 is connected with a fourth rubber cap 714 for facilitating the screwing of the fourth screw 713. A fourth position indicator 715 is also sleeved on the fourth screw 713. The fourth position indicator 715 is located between the top plate of the slotted support seat 71 and the fourth rubber cap 714 and is connected to the top plate of the slotted support seat 71.

[0069] To facilitate driving the third movable seat to move forward and backward, the slotting mechanism 70 further includes a second cylinder 76, the cylinder body of the second cylinder 76 is connected to the rear surface of the rear sealing plate 725, and the cylinder rod of the second cylinder 76 passes through the rear sealing plate 725 and is connected to the U-shaped protrusion 721.

[0070] For ease of arrangement, in this embodiment, the pre-milling mechanism 20 , the gluing mechanism 30 , and the gluing mechanism 60 are arranged on one side of the conveying mechanism 10 along the traveling direction of the aluminum honeycomb sandwich metal plate, and the edge banding mechanism 40 is arranged on the other side of the conveying mechanism 10 .

[0071] In the description of the present disclosure, it should be noted that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0072] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0073] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this disclosure on a case-by-case basis. The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the values ​​between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values ​​can be combined to generate one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed herein. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. In the event of any conflict or inconsistency between the definitions used herein and definitions in other published documents, the definitions used herein shall prevail.

[0074] The above embodiment is only for illustrating the technical concept and features of the present disclosure and is a preferred embodiment. Its purpose is to enable people familiar with this technology to understand the content of the present disclosure and implement it accordingly, and it cannot be used to limit the scope of protection of the present disclosure.

Claims

1. A method for preparing a metal plate, comprising the following steps: I - Provide cut perforated plates, where: The porous plate comprises a core plate and panels covering both sides of the core plate, the core plate having a plurality of holes, the porous plate having a plurality of cut side surfaces, the plurality of cut side surfaces being located between the outer surfaces of the panels on both sides, the cut side surfaces having a recessed portion formed by cutting part of the core plate holes; II - providing edge banding adapted to the cut surface; III - applying a first adhesive layer on the cut surface, wherein the first adhesive layer comprises a PUR hot melt adhesive; IV - applying a second adhesive onto the cut surface coated with the PUR hot melt adhesive layer, wherein the second adhesive comprises hot melt adhesive; and V - Press the edge banding strip onto the cut surface after applying the hot melt adhesive and solidify it.

2. The preparation method according to claim 1, wherein In step III, the PUR hot melt adhesive roller is applied onto the cut surface.

3. The preparation method according to claim 1 or 2, wherein In step IV, the second hot melt adhesive is applied to the first adhesive layer and the recessed portion of the cut surface by a glue injection machine.

4. A method according to any preceding claim, wherein: The width W of the edge banding strip satisfies the following relationship: d1<D≤(d1+2×d2), wherein d1 represents the thickness of the core board, and d2 represents the thickness of the panel.

5. A method according to any preceding claim, wherein: The thickness of the first adhesive layer is 0.1-0.5 mm.

6. A method according to any preceding claim, wherein: The application thickness of the second adhesive is 2-7 mm.

7. A method according to any preceding claim, wherein: The PUR hot melt adhesive includes PUR polyurethane hot melt adhesive.

8. A method according to any preceding claim, wherein: The second adhesive layer includes EVA hot melt adhesive.

9. A method according to any preceding claim, wherein: The core plate comprises a metal honeycomb plate, and the holes are hexagonal holes; the edge banding strips comprise PVC or ABS edge banding strips.

10. The preparation method according to claim 9, wherein: The metal honeycomb panel is an aluminum or steel honeycomb panel.

11. A method according to any preceding claim, wherein: The panel comprises a panel, and the panel comprises a metal layer and a topcoat layer covered on the outer surface of the metal layer, and an ink printing layer is printed on the topcoat layer.

12. The preparation method according to claim 11, wherein The ink printing layer is formed on the topcoat layer by 3D printing ink.

13. The preparation method according to claim 11, wherein A protective layer is arranged on the ink printing layer.

14. The preparation method according to claim 11, wherein: The panel includes a topcoat layer, a primer layer, a first pre-treatment layer, a first galvanized layer, a metal layer, a second galvanized layer, a second pre-treatment layer and a back-paint layer which are arranged in sequence, the metal layer includes a steel plate, and the back-paint layer is fixed on the core plate.

15. A metal plate comprising: A porous plate, comprising a porous core plate and panels covering upper and lower sides of the core plate, wherein the core plate has a plurality of holes; and An edge banding strip covering the cut side of the porous plate; Wherein, the plurality of cut side surfaces are located between the outer surfaces of the panels at two sides, and the cut side surfaces have a recessed portion formed by cutting part of the holes; The edge banding strip is fixed to the cut side surface by an adhesive layer, wherein the adhesive layer comprises a first adhesive layer coated on the cut side surface and a second adhesive layer located between the first adhesive layer and the edge banding strip, wherein the first adhesive layer comprises PUR hot melt adhesive, and the second adhesive comprises hot melt adhesive.

16. The metal plate according to claim 15, wherein The width W of the edge banding strip satisfies the following relationship: d1<D≤(d1+2×d2), wherein d1 represents the thickness of the core board, and d2 represents the thickness of the panel.

17. The metal plate according to claim 15, wherein The edge banding strip includes a PVC or ABS edge banding strip, the PUR hot melt adhesive includes a PUR polyurethane hot melt adhesive, and the second adhesive layer includes an EVA hot melt adhesive layer.

18. The metal plate according to claim 15, wherein The panel comprises a metal layer and a topcoat layer covering the outer surface of the metal layer, and an ink printing layer is printed on the topcoat layer.

19. The metal plate according to claim 18, wherein The panel includes a topcoat layer, a primer layer, a first pretreatment layer, a first galvanized layer, a metal layer, a second galvanized layer, a second pretreatment layer and a back paint layer which are arranged in sequence, the metal layer includes a steel plate, the back paint layer is fixed on the core plate, the ink printing layer is arranged on the topcoat layer, and a protective layer is provided on the ink printing layer.

20. The metal plate according to claim 18, which is produced by the production method according to any one of claims 1 to 14.

21. A metal plate edge banding device, comprising a conveying mechanism, a glue coating mechanism, a glue injection mechanism and an edge banding conveying mechanism, The glue injection mechanism is used to inject glue into the groove on the edge cut surface of the metal plate, and the glue injection mechanism includes a first fixed seat, a first movable seat connected to the first fixed seat and movable forward and backward, a support rod arranged on the top of the first movable seat and extending upward, a support block rotatably and movably mounted on the support rod, and a glue injection unit connected to the support block; The glue injection unit includes a glue injection pump connected to the support block, a glue injector connected to the bottom of the glue injection pump, and a glue tube connected to the rear of the glue injection pump. The front end of the glue injector is provided with a nozzle, which is cylindrical and located in front of the glue injection pump. The diameter of the nozzle is less than or equal to the groove width of the thickness groove of the metal plate d1+2×d2. The glue injection pump is used to pump the glue in the glue tube into the glue injector and spray it out through the nozzle.

22. The metal plate edge banding device according to claim 21, wherein: The glue coating mechanism comprises a glue coating roller, which uses PUR hot melt adhesive as a raw material; the glue injection mechanism uses EVA hot melt adhesive as a raw material.

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